Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 7123 insertions, 0 deletions

diff --git a/drivers/scsi/cxgbi/Kconfig b/drivers/scsi/cxgbi/Kconfig
new file mode 100644
index 000000000..17eb5d522
--- /dev/null
+++ b/drivers/scsi/cxgbi/Kconfig
@@ -0,0 +1,2 @@
+source "drivers/scsi/cxgbi/cxgb3i/Kconfig"
+source "drivers/scsi/cxgbi/cxgb4i/Kconfig"
diff --git a/drivers/scsi/cxgbi/Makefile b/drivers/scsi/cxgbi/Makefile
new file mode 100644
index 000000000..a73781ac1
--- /dev/null
+++ b/drivers/scsi/cxgbi/Makefile
@@ -0,0 +1,4 @@
+ccflags-y += -Idrivers/net/ethernet/chelsio/libcxgb
+
+obj-$(CONFIG_SCSI_CXGB3_ISCSI)	+= libcxgbi.o cxgb3i/
+obj-$(CONFIG_SCSI_CXGB4_ISCSI)	+= libcxgbi.o cxgb4i/
diff --git a/drivers/scsi/cxgbi/cxgb3i/Kbuild b/drivers/scsi/cxgbi/cxgb3i/Kbuild
new file mode 100644
index 000000000..663c52e05
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb3i/Kbuild
@@ -0,0 +1,4 @@
+ccflags-y += -I$(srctree)/drivers/net/ethernet/chelsio/cxgb3
+ccflags-y += -I$(srctree)/drivers/net/ethernet/chelsio/libcxgb
+
+obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i.o
diff --git a/drivers/scsi/cxgbi/cxgb3i/Kconfig b/drivers/scsi/cxgbi/cxgb3i/Kconfig
new file mode 100644
index 000000000..f68c871b1
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb3i/Kconfig
@@ -0,0 +1,11 @@
+config SCSI_CXGB3_ISCSI
+	tristate "Chelsio T3 iSCSI support"
+	depends on PCI && INET && (IPV6 || IPV6=n)
+	select NETDEVICES
+	select ETHERNET
+	select NET_VENDOR_CHELSIO
+	select CHELSIO_T3
+	select CHELSIO_LIB
+	select SCSI_ISCSI_ATTRS
+	---help---
+	  This driver supports iSCSI offload for the Chelsio T3 devices.
diff --git a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
new file mode 100644
index 000000000..0fc382cb9
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
@@ -0,0 +1,1404 @@
+/*
+ * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
+ *
+ * Copyright (C) 2003-2015 Chelsio Communications.  All rights reserved.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
+ * release for licensing terms and conditions.
+ *
+ * Written by:	Dimitris Michailidis (dm@chelsio.com)
+ *		Karen Xie (kxie@chelsio.com)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <scsi/scsi_host.h>
+
+#include "common.h"
+#include "t3_cpl.h"
+#include "t3cdev.h"
+#include "cxgb3_defs.h"
+#include "cxgb3_ctl_defs.h"
+#include "cxgb3_offload.h"
+#include "firmware_exports.h"
+#include "cxgb3i.h"
+
+static unsigned int dbg_level;
+#include "../libcxgbi.h"
+
+#define DRV_MODULE_NAME         "cxgb3i"
+#define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
+#define DRV_MODULE_VERSION	"2.0.1-ko"
+#define DRV_MODULE_RELDATE	"Apr. 2015"
+
+static char version[] =
+	DRV_MODULE_DESC " " DRV_MODULE_NAME
+	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Chelsio Communications, Inc.");
+MODULE_DESCRIPTION(DRV_MODULE_DESC);
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(dbg_level, uint, 0644);
+MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
+
+static int cxgb3i_rcv_win = 256 * 1024;
+module_param(cxgb3i_rcv_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
+
+static int cxgb3i_snd_win = 128 * 1024;
+module_param(cxgb3i_snd_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
+
+static int cxgb3i_rx_credit_thres = 10 * 1024;
+module_param(cxgb3i_rx_credit_thres, int, 0644);
+MODULE_PARM_DESC(cxgb3i_rx_credit_thres,
+		 "RX credits return threshold in bytes (default=10KB)");
+
+static unsigned int cxgb3i_max_connect = 8 * 1024;
+module_param(cxgb3i_max_connect, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
+
+static unsigned int cxgb3i_sport_base = 20000;
+module_param(cxgb3i_sport_base, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
+
+static void cxgb3i_dev_open(struct t3cdev *);
+static void cxgb3i_dev_close(struct t3cdev *);
+static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
+
+static struct cxgb3_client t3_client = {
+	.name = DRV_MODULE_NAME,
+	.handlers = cxgb3i_cpl_handlers,
+	.add = cxgb3i_dev_open,
+	.remove = cxgb3i_dev_close,
+	.event_handler = cxgb3i_dev_event_handler,
+};
+
+static struct scsi_host_template cxgb3i_host_template = {
+	.module		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	.proc_name	= DRV_MODULE_NAME,
+	.can_queue	= CXGB3I_SCSI_HOST_QDEPTH,
+	.queuecommand	= iscsi_queuecommand,
+	.change_queue_depth = scsi_change_queue_depth,
+	.sg_tablesize	= SG_ALL,
+	.max_sectors	= 0xFFFF,
+	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
+	.eh_timed_out	= iscsi_eh_cmd_timed_out,
+	.eh_abort_handler = iscsi_eh_abort,
+	.eh_device_reset_handler = iscsi_eh_device_reset,
+	.eh_target_reset_handler = iscsi_eh_recover_target,
+	.target_alloc	= iscsi_target_alloc,
+	.use_clustering	= DISABLE_CLUSTERING,
+	.this_id	= -1,
+	.track_queue_depth = 1,
+};
+
+static struct iscsi_transport cxgb3i_iscsi_transport = {
+	.owner		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	/* owner and name should be set already */
+	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
+				| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
+				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
+	.attr_is_visible	= cxgbi_attr_is_visible,
+	.get_host_param	= cxgbi_get_host_param,
+	.set_host_param	= cxgbi_set_host_param,
+	/* session management */
+	.create_session	= cxgbi_create_session,
+	.destroy_session	= cxgbi_destroy_session,
+	.get_session_param = iscsi_session_get_param,
+	/* connection management */
+	.create_conn	= cxgbi_create_conn,
+	.bind_conn	= cxgbi_bind_conn,
+	.destroy_conn	= iscsi_tcp_conn_teardown,
+	.start_conn	= iscsi_conn_start,
+	.stop_conn	= iscsi_conn_stop,
+	.get_conn_param	= iscsi_conn_get_param,
+	.set_param	= cxgbi_set_conn_param,
+	.get_stats	= cxgbi_get_conn_stats,
+	/* pdu xmit req from user space */
+	.send_pdu	= iscsi_conn_send_pdu,
+	/* task */
+	.init_task	= iscsi_tcp_task_init,
+	.xmit_task	= iscsi_tcp_task_xmit,
+	.cleanup_task	= cxgbi_cleanup_task,
+	/* pdu */
+	.alloc_pdu	= cxgbi_conn_alloc_pdu,
+	.init_pdu	= cxgbi_conn_init_pdu,
+	.xmit_pdu	= cxgbi_conn_xmit_pdu,
+	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
+	/* TCP connect/disconnect */
+	.get_ep_param	= cxgbi_get_ep_param,
+	.ep_connect	= cxgbi_ep_connect,
+	.ep_poll	= cxgbi_ep_poll,
+	.ep_disconnect	= cxgbi_ep_disconnect,
+	/* Error recovery timeout call */
+	.session_recovery_timedout = iscsi_session_recovery_timedout,
+};
+
+static struct scsi_transport_template *cxgb3i_stt;
+
+/*
+ * CPL (Chelsio Protocol Language) defines a message passing interface between
+ * the host driver and Chelsio asic.
+ * The section below implments CPLs that related to iscsi tcp connection
+ * open/close/abort and data send/receive.
+ */
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
+
+static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
+			      const struct l2t_entry *e)
+{
+	unsigned int wscale = cxgbi_sock_compute_wscale(csk->rcv_win);
+	struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
+
+	skb->priority = CPL_PRIORITY_SETUP;
+
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
+	req->local_port = csk->saddr.sin_port;
+	req->peer_port = csk->daddr.sin_port;
+	req->local_ip = csk->saddr.sin_addr.s_addr;
+	req->peer_ip = csk->daddr.sin_addr.s_addr;
+
+	req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
+			V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
+			V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
+	req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
+			V_RCV_BUFSIZ(csk->rcv_win >> 10));
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
+		csk, csk->state, csk->flags, csk->atid,
+		&req->local_ip, ntohs(req->local_port),
+		&req->peer_ip, ntohs(req->peer_port),
+		csk->mss_idx, e->idx, e->smt_idx);
+
+	l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
+{
+	cxgbi_sock_act_open_req_arp_failure(NULL, skb);
+}
+
+/*
+ * CPL connection close request: host ->
+ *
+ * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
+ * the write queue (i.e., after any unsent txt data).
+ */
+static void send_close_req(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->cpl_close;
+	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
+	unsigned int tid = csk->tid;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	csk->cpl_close = NULL;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
+	req->wr.wr_lo = htonl(V_WR_TID(tid));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
+	req->rsvd = htonl(csk->write_seq);
+
+	cxgbi_sock_skb_entail(csk, skb);
+	if (csk->state >= CTP_ESTABLISHED)
+		push_tx_frames(csk, 1);
+}
+
+/*
+ * CPL connection abort request: host ->
+ *
+ * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
+ * for the same connection and also that we do not try to send a message
+ * after the connection has closed.
+ */
+static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
+{
+	struct cpl_abort_req *req = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"t3dev 0x%p, tid %u, skb 0x%p.\n",
+		tdev, GET_TID(req), skb);
+	req->cmd = CPL_ABORT_NO_RST;
+	cxgb3_ofld_send(tdev, skb);
+}
+
+static void send_abort_req(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->cpl_abort_req;
+	struct cpl_abort_req *req;
+
+	if (unlikely(csk->state == CTP_ABORTING || !skb))
+		return;
+	cxgbi_sock_set_state(csk, CTP_ABORTING);
+	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
+	/* Purge the send queue so we don't send anything after an abort. */
+	cxgbi_sock_purge_write_queue(csk);
+
+	csk->cpl_abort_req = NULL;
+	req = (struct cpl_abort_req *)skb->head;
+	skb->priority = CPL_PRIORITY_DATA;
+	set_arp_failure_handler(skb, abort_arp_failure);
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
+	req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
+	req->rsvd0 = htonl(csk->snd_nxt);
+	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
+	req->cmd = CPL_ABORT_SEND_RST;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
+		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
+		req->rsvd1);
+
+	l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+/*
+ * CPL connection abort reply: host ->
+ *
+ * Send an ABORT_RPL message in response of the ABORT_REQ received.
+ */
+static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
+{
+	struct sk_buff *skb = csk->cpl_abort_rpl;
+	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
+		csk, csk->state, csk->flags, csk->tid, rst_status);
+
+	csk->cpl_abort_rpl = NULL;
+	skb->priority = CPL_PRIORITY_DATA;
+	rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
+	rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+	OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
+	rpl->cmd = rst_status;
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+}
+
+/*
+ * CPL connection rx data ack: host ->
+ * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
+ * credits sent.
+ */
+static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
+{
+	struct sk_buff *skb;
+	struct cpl_rx_data_ack *req;
+	u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
+		csk, csk->state, csk->flags, csk->tid, credits, dack);
+
+	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
+	if (!skb) {
+		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
+		return 0;
+	}
+	req = (struct cpl_rx_data_ack *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
+	req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
+				V_RX_CREDITS(credits));
+	skb->priority = CPL_PRIORITY_ACK;
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return credits;
+}
+
+/*
+ * CPL connection tx data: host ->
+ *
+ * Send iscsi PDU via TX_DATA CPL message. Returns the number of
+ * credits sent.
+ * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
+ * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
+ */
+
+static unsigned int wrlen __read_mostly;
+static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
+
+static void init_wr_tab(unsigned int wr_len)
+{
+	int i;
+
+	if (skb_wrs[1])		/* already initialized */
+		return;
+	for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
+		int sgl_len = (3 * i) / 2 + (i & 1);
+
+		sgl_len += 3;
+		skb_wrs[i] = (sgl_len <= wr_len
+			      ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
+	}
+	wrlen = wr_len * 8;
+}
+
+static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
+				   int len, int req_completion)
+{
+	struct tx_data_wr *req;
+	struct l2t_entry *l2t = csk->l2t;
+
+	skb_reset_transport_header(skb);
+	req = __skb_push(skb, sizeof(*req));
+	req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
+			(req_completion ? F_WR_COMPL : 0));
+	req->wr_lo = htonl(V_WR_TID(csk->tid));
+	/* len includes the length of any HW ULP additions */
+	req->len = htonl(len);
+	/* V_TX_ULP_SUBMODE sets both the mode and submode */
+	req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
+			   V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
+	req->sndseq = htonl(csk->snd_nxt);
+	req->param = htonl(V_TX_PORT(l2t->smt_idx));
+
+	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+		req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
+				    V_TX_CPU_IDX(csk->rss_qid));
+		/* sendbuffer is in units of 32KB. */
+		req->param |= htonl(V_TX_SNDBUF(csk->snd_win >> 15));
+		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+	}
+}
+
+/**
+ * push_tx_frames -- start transmit
+ * @c3cn: the offloaded connection
+ * @req_completion: request wr_ack or not
+ *
+ * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
+ * connection's send queue and sends them on to T3.  Must be called with the
+ * connection's lock held.  Returns the amount of send buffer space that was
+ * freed as a result of sending queued data to T3.
+ */
+
+static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
+{
+	kfree_skb(skb);
+}
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
+{
+	int total_size = 0;
+	struct sk_buff *skb;
+
+	if (unlikely(csk->state < CTP_ESTABLISHED ||
+		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
+			log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+				"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
+				csk, csk->state, csk->flags, csk->tid);
+		return 0;
+	}
+
+	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
+		int len = skb->len;	/* length before skb_push */
+		int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
+		int wrs_needed = skb_wrs[frags];
+
+		if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
+			wrs_needed = 1;
+
+		WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
+
+		if (csk->wr_cred < wrs_needed) {
+			log_debug(1 << CXGBI_DBG_PDU_TX,
+				"csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
+				csk, skb->len, skb->data_len, frags,
+				wrs_needed, csk->wr_cred);
+			break;
+		}
+
+		__skb_unlink(skb, &csk->write_queue);
+		skb->priority = CPL_PRIORITY_DATA;
+		skb->csum = wrs_needed;	/* remember this until the WR_ACK */
+		csk->wr_cred -= wrs_needed;
+		csk->wr_una_cred += wrs_needed;
+		cxgbi_sock_enqueue_wr(csk, skb);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
+			"left %u, unack %u.\n",
+			csk, skb->len, skb->data_len, frags, skb->csum,
+			csk->wr_cred, csk->wr_una_cred);
+
+		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
+			if ((req_completion &&
+				csk->wr_una_cred == wrs_needed) ||
+			     csk->wr_una_cred >= csk->wr_max_cred / 2) {
+				req_completion = 1;
+				csk->wr_una_cred = 0;
+			}
+			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
+			make_tx_data_wr(csk, skb, len, req_completion);
+			csk->snd_nxt += len;
+			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
+		}
+		total_size += skb->truesize;
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p, tid 0x%x, send skb 0x%p.\n",
+			csk, csk->tid, skb);
+		set_arp_failure_handler(skb, arp_failure_skb_discard);
+		l2t_send(csk->cdev->lldev, skb, csk->l2t);
+	}
+	return total_size;
+}
+
+/*
+ * Process a CPL_ACT_ESTABLISH message: -> host
+ * Updates connection state from an active establish CPL message.  Runs with
+ * the connection lock held.
+ */
+
+static inline void free_atid(struct cxgbi_sock *csk)
+{
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
+		cxgb3_free_atid(csk->cdev->lldev, csk->atid);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
+		cxgbi_sock_put(csk);
+	}
+}
+
+static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_act_establish *req = cplhdr(skb);
+	unsigned int tid = GET_TID(req);
+	unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
+	u32 rcv_isn = ntohl(req->rcv_isn);	/* real RCV_ISN + 1 */
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
+		atid, atid, csk, csk->state, csk->flags, rcv_isn);
+
+	cxgbi_sock_get(csk);
+	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
+	csk->tid = tid;
+	cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
+
+	free_atid(csk);
+
+	csk->rss_qid = G_QNUM(ntohs(skb->csum));
+
+	spin_lock_bh(&csk->lock);
+	if (csk->retry_timer.function) {
+		del_timer(&csk->retry_timer);
+		csk->retry_timer.function = NULL;
+	}
+
+	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
+		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
+			csk, csk->state, csk->flags, csk->tid);
+
+	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
+	if (csk->rcv_win > (M_RCV_BUFSIZ << 10))
+		csk->rcv_wup -= csk->rcv_win - (M_RCV_BUFSIZ << 10);
+
+	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
+
+	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
+		/* upper layer has requested closing */
+		send_abort_req(csk);
+	else {
+		if (skb_queue_len(&csk->write_queue))
+			push_tx_frames(csk, 1);
+		cxgbi_conn_tx_open(csk);
+	}
+
+	spin_unlock_bh(&csk->lock);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process a CPL_ACT_OPEN_RPL message: -> host
+ * Handle active open failures.
+ */
+static int act_open_rpl_status_to_errno(int status)
+{
+	switch (status) {
+	case CPL_ERR_CONN_RESET:
+		return -ECONNREFUSED;
+	case CPL_ERR_ARP_MISS:
+		return -EHOSTUNREACH;
+	case CPL_ERR_CONN_TIMEDOUT:
+		return -ETIMEDOUT;
+	case CPL_ERR_TCAM_FULL:
+		return -ENOMEM;
+	case CPL_ERR_CONN_EXIST:
+		return -EADDRINUSE;
+	default:
+		return -EIO;
+	}
+}
+
+static void act_open_retry_timer(struct timer_list *t)
+{
+	struct cxgbi_sock *csk = from_timer(csk, t, retry_timer);
+	struct sk_buff *skb;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
+	if (!skb)
+		cxgbi_sock_fail_act_open(csk, -ENOMEM);
+	else {
+		skb->sk = (struct sock *)csk;
+		set_arp_failure_handler(skb, act_open_arp_failure);
+		send_act_open_req(csk, skb, csk->l2t);
+	}
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+}
+
+static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_act_open_rpl *rpl = cplhdr(skb);
+
+	pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
+		csk, csk->state, csk->flags, csk->atid, rpl->status,
+		&csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
+		&csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
+
+	if (rpl->status != CPL_ERR_TCAM_FULL &&
+	    rpl->status != CPL_ERR_CONN_EXIST &&
+	    rpl->status != CPL_ERR_ARP_MISS)
+		cxgb3_queue_tid_release(tdev, GET_TID(rpl));
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+	if (rpl->status == CPL_ERR_CONN_EXIST &&
+	    csk->retry_timer.function != act_open_retry_timer) {
+		csk->retry_timer.function = act_open_retry_timer;
+		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
+	} else
+		cxgbi_sock_fail_act_open(csk,
+				act_open_rpl_status_to_errno(rpl->status));
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process PEER_CLOSE CPL messages: -> host
+ * Handle peer FIN.
+ */
+static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_rcv_peer_close(csk);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process CLOSE_CONN_RPL CPL message: -> host
+ * Process a peer ACK to our FIN.
+ */
+static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
+			    void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_close_con_rpl *rpl = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
+		csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
+
+	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process ABORT_REQ_RSS CPL message: -> host
+ * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
+ * request except that we need to reply to it.
+ */
+
+static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
+				 int *need_rst)
+{
+	switch (abort_reason) {
+	case CPL_ERR_BAD_SYN: /* fall through */
+	case CPL_ERR_CONN_RESET:
+		return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
+	case CPL_ERR_XMIT_TIMEDOUT:
+	case CPL_ERR_PERSIST_TIMEDOUT:
+	case CPL_ERR_FINWAIT2_TIMEDOUT:
+	case CPL_ERR_KEEPALIVE_TIMEDOUT:
+		return -ETIMEDOUT;
+	default:
+		return -EIO;
+	}
+}
+
+static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	const struct cpl_abort_req_rss *req = cplhdr(skb);
+	struct cxgbi_sock *csk = ctx;
+	int rst_status = CPL_ABORT_NO_RST;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
+	    req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
+		goto done;
+	}
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
+		cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
+		cxgbi_sock_set_state(csk, CTP_ABORTING);
+		goto out;
+	}
+
+	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
+	send_abort_rpl(csk, rst_status);
+
+	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
+		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
+		cxgbi_sock_closed(csk);
+	}
+
+out:
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+done:
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process ABORT_RPL_RSS CPL message: -> host
+ * Process abort replies.  We only process these messages if we anticipate
+ * them as the coordination between SW and HW in this area is somewhat lacking
+ * and sometimes we get ABORT_RPLs after we are done with the connection that
+ * originated the ABORT_REQ.
+ */
+static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
+	struct cxgbi_sock *csk = ctx;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
+		rpl->status, csk, csk ? csk->state : 0,
+		csk ? csk->flags : 0UL);
+	/*
+	 * Ignore replies to post-close aborts indicating that the abort was
+	 * requested too late.  These connections are terminated when we get
+	 * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
+	 * arrives the TID is either no longer used or it has been recycled.
+	 */
+	if (rpl->status == CPL_ERR_ABORT_FAILED)
+		goto rel_skb;
+	/*
+	 * Sometimes we've already closed the connection, e.g., a post-close
+	 * abort races with ABORT_REQ_RSS, the latter frees the connection
+	 * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
+	 * but FW turns the ABORT_REQ into a regular one and so we get
+	 * ABORT_RPL_RSS with status 0 and no connection.
+	 */
+	if (csk)
+		cxgbi_sock_rcv_abort_rpl(csk);
+rel_skb:
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process RX_ISCSI_HDR CPL message: -> host
+ * Handle received PDUs, the payload could be DDP'ed. If not, the payload
+ * follow after the bhs.
+ */
+static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
+	struct cpl_iscsi_hdr_norss data_cpl;
+	struct cpl_rx_data_ddp_norss ddp_cpl;
+	unsigned int hdr_len, data_len, status;
+	unsigned int len;
+	int err;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
+		csk, csk->state, csk->flags, csk->tid, skb, skb->len);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
+	cxgbi_skcb_flags(skb) = 0;
+
+	skb_reset_transport_header(skb);
+	__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
+
+	len = hdr_len = ntohs(hdr_cpl->len);
+	/* msg coalesce is off or not enough data received */
+	if (skb->len <= hdr_len) {
+		pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
+			csk->cdev->ports[csk->port_id]->name, csk->tid,
+			skb->len, hdr_len);
+		goto abort_conn;
+	}
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
+
+	err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
+			    sizeof(ddp_cpl));
+	if (err < 0) {
+		pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
+			csk->cdev->ports[csk->port_id]->name, csk->tid,
+			skb->len, sizeof(ddp_cpl), err);
+		goto abort_conn;
+	}
+
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
+	cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
+	cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
+	status = ntohl(ddp_cpl.ddp_status);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
+		csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
+
+	if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
+	if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
+	if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
+
+	if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
+		err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
+		if (err < 0) {
+			pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
+				csk->cdev->ports[csk->port_id]->name,
+				csk->tid, sizeof(data_cpl), skb->len, err);
+			goto abort_conn;
+		}
+		data_len = ntohs(data_cpl.len);
+		log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
+			"skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
+			skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
+		len += sizeof(data_cpl) + data_len;
+	} else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
+
+	csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
+	__pskb_trim(skb, len);
+	__skb_queue_tail(&csk->receive_queue, skb);
+	cxgbi_conn_pdu_ready(csk);
+
+	spin_unlock_bh(&csk->lock);
+	return 0;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process TX_DATA_ACK CPL messages: -> host
+ * Process an acknowledgment of WR completion.  Advance snd_una and send the
+ * next batch of work requests from the write queue.
+ */
+static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_wr_ack *hdr = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, cr %u.\n",
+		csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
+
+	cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * for each connection, pre-allocate skbs needed for close/abort requests. So
+ * that we can service the request right away.
+ */
+static int alloc_cpls(struct cxgbi_sock *csk)
+{
+	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_close)
+		return -ENOMEM;
+	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_abort_req)
+		goto free_cpl_skbs;
+
+	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_abort_rpl)
+		goto free_cpl_skbs;
+
+	return 0;
+
+free_cpl_skbs:
+	cxgbi_sock_free_cpl_skbs(csk);
+	return -ENOMEM;
+}
+
+/**
+ * release_offload_resources - release offload resource
+ * @c3cn: the offloaded iscsi tcp connection.
+ * Release resources held by an offload connection (TID, L2T entry, etc.)
+ */
+static void l2t_put(struct cxgbi_sock *csk)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+	if (csk->l2t) {
+		l2t_release(t3dev, csk->l2t);
+		csk->l2t = NULL;
+		cxgbi_sock_put(csk);
+	}
+}
+
+static void release_offload_resources(struct cxgbi_sock *csk)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	csk->rss_qid = 0;
+	cxgbi_sock_free_cpl_skbs(csk);
+
+	if (csk->wr_cred != csk->wr_max_cred) {
+		cxgbi_sock_purge_wr_queue(csk);
+		cxgbi_sock_reset_wr_list(csk);
+	}
+	l2t_put(csk);
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
+		free_atid(csk);
+	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
+		cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
+		cxgbi_sock_put(csk);
+	}
+	csk->dst = NULL;
+	csk->cdev = NULL;
+}
+
+static void update_address(struct cxgbi_hba *chba)
+{
+	if (chba->ipv4addr) {
+		if (chba->vdev &&
+		    chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
+			cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
+			cxgb3i_set_private_ipv4addr(chba->ndev, 0);
+			pr_info("%s set %pI4.\n",
+				chba->vdev->name, &chba->ipv4addr);
+		} else if (chba->ipv4addr !=
+				cxgb3i_get_private_ipv4addr(chba->ndev)) {
+			cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
+			pr_info("%s set %pI4.\n",
+				chba->ndev->name, &chba->ipv4addr);
+		}
+	} else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
+		if (chba->vdev)
+			cxgb3i_set_private_ipv4addr(chba->vdev, 0);
+		cxgb3i_set_private_ipv4addr(chba->ndev, 0);
+	}
+}
+
+static int init_act_open(struct cxgbi_sock *csk)
+{
+	struct dst_entry *dst = csk->dst;
+	struct cxgbi_device *cdev = csk->cdev;
+	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+	struct net_device *ndev = cdev->ports[csk->port_id];
+	struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
+	struct sk_buff *skb = NULL;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
+
+	update_address(chba);
+	if (chba->ipv4addr)
+		csk->saddr.sin_addr.s_addr = chba->ipv4addr;
+
+	csk->rss_qid = 0;
+	csk->l2t = t3_l2t_get(t3dev, dst, ndev,
+			      &csk->daddr.sin_addr.s_addr);
+	if (!csk->l2t) {
+		pr_err("NO l2t available.\n");
+		return -EINVAL;
+	}
+	cxgbi_sock_get(csk);
+
+	csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
+	if (csk->atid < 0) {
+		pr_err("NO atid available.\n");
+		goto rel_resource;
+	}
+	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
+	cxgbi_sock_get(csk);
+
+	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
+	if (!skb)
+		goto rel_resource;
+	skb->sk = (struct sock *)csk;
+	set_arp_failure_handler(skb, act_open_arp_failure);
+	csk->snd_win = cxgb3i_snd_win;
+	csk->rcv_win = cxgb3i_rcv_win;
+
+	csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
+	csk->wr_una_cred = 0;
+	csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
+	cxgbi_sock_reset_wr_list(csk);
+	csk->err = 0;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
+		csk, csk->state, csk->flags,
+		&csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
+		&csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
+
+	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
+	send_act_open_req(csk, skb, csk->l2t);
+	return 0;
+
+rel_resource:
+	if (skb)
+		__kfree_skb(skb);
+	return -EINVAL;
+}
+
+cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
+	[CPL_ACT_ESTABLISH] = do_act_establish,
+	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
+	[CPL_PEER_CLOSE] = do_peer_close,
+	[CPL_ABORT_REQ_RSS] = do_abort_req,
+	[CPL_ABORT_RPL_RSS] = do_abort_rpl,
+	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
+	[CPL_TX_DMA_ACK] = do_wr_ack,
+	[CPL_ISCSI_HDR] = do_iscsi_hdr,
+};
+
+/**
+ * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
+ * @cdev:	cxgbi adapter
+ */
+static int cxgb3i_ofld_init(struct cxgbi_device *cdev)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+	struct adap_ports port;
+	struct ofld_page_info rx_page_info;
+	unsigned int wr_len;
+	int rc;
+
+	if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
+	    t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
+	    t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
+		pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
+		return -EINVAL;
+	}
+
+	if (cxgb3i_max_connect > CXGBI_MAX_CONN)
+		cxgb3i_max_connect = CXGBI_MAX_CONN;
+
+	rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
+					cxgb3i_max_connect);
+	if (rc < 0)
+		return rc;
+
+	init_wr_tab(wr_len);
+	cdev->csk_release_offload_resources = release_offload_resources;
+	cdev->csk_push_tx_frames = push_tx_frames;
+	cdev->csk_send_abort_req = send_abort_req;
+	cdev->csk_send_close_req = send_close_req;
+	cdev->csk_send_rx_credits = send_rx_credits;
+	cdev->csk_alloc_cpls = alloc_cpls;
+	cdev->csk_init_act_open = init_act_open;
+
+	pr_info("cdev 0x%p, offload up, added.\n", cdev);
+	return 0;
+}
+
+/*
+ * functions to program the pagepod in h/w
+ */
+static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
+{
+	struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
+
+	memset(req, 0, sizeof(*req));
+
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
+	req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
+				   V_ULPTX_CMD(ULP_MEM_WRITE));
+	req->len = htonl(V_ULP_MEMIO_DATA_LEN(IPPOD_SIZE >> 5) |
+			 V_ULPTX_NFLITS((IPPOD_SIZE >> 3) + 1));
+}
+
+static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
+{
+	return ((struct t3cdev *)cdev->lldev)->ulp_iscsi;
+}
+
+static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
+		       struct cxgbi_task_tag_info *ttinfo)
+{
+	unsigned int idx = ttinfo->idx;
+	unsigned int npods = ttinfo->npods;
+	struct scatterlist *sg = ttinfo->sgl;
+	struct cxgbi_pagepod *ppod;
+	struct ulp_mem_io *req;
+	unsigned int sg_off;
+	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
+	int i;
+
+	for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
+		struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
+					       IPPOD_SIZE, 0, GFP_ATOMIC);
+
+		if (!skb)
+			return -ENOMEM;
+		ulp_mem_io_set_hdr(skb, pm_addr);
+		req = (struct ulp_mem_io *)skb->head;
+		ppod = (struct cxgbi_pagepod *)(req + 1);
+		sg_off = i * PPOD_PAGES_MAX;
+		cxgbi_ddp_set_one_ppod(ppod, ttinfo, &sg,
+				       &sg_off);
+		skb->priority = CPL_PRIORITY_CONTROL;
+		cxgb3_ofld_send(ppm->lldev, skb);
+	}
+	return 0;
+}
+
+static void ddp_clear_map(struct cxgbi_device *cdev, struct cxgbi_ppm *ppm,
+			  struct cxgbi_task_tag_info *ttinfo)
+{
+	unsigned int idx = ttinfo->idx;
+	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
+	unsigned int npods = ttinfo->npods;
+	int i;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		  "cdev 0x%p, clear idx %u, npods %u.\n",
+		  cdev, idx, npods);
+
+	for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
+		struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
+					       IPPOD_SIZE, 0, GFP_ATOMIC);
+
+		if (!skb) {
+			pr_err("cdev 0x%p, clear ddp, %u,%d/%u, skb OOM.\n",
+			       cdev, idx, i, npods);
+			continue;
+		}
+		ulp_mem_io_set_hdr(skb, pm_addr);
+		skb->priority = CPL_PRIORITY_CONTROL;
+		cxgb3_ofld_send(ppm->lldev, skb);
+	}
+}
+
+static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
+				unsigned int tid, int pg_idx)
+{
+	struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
+					GFP_KERNEL);
+	struct cpl_set_tcb_field *req;
+	u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
+	if (!skb)
+		return -ENOMEM;
+
+	/* set up ulp submode and page size */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+	req->reply = V_NO_REPLY(1);
+	req->cpu_idx = 0;
+	req->word = htons(31);
+	req->mask = cpu_to_be64(0xF0000000);
+	req->val = cpu_to_be64(val << 28);
+	skb->priority = CPL_PRIORITY_CONTROL;
+
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return 0;
+}
+
+/**
+ * cxgb3i_setup_conn_digest - setup conn. digest setting
+ * @csk: cxgb tcp socket
+ * @tid: connection id
+ * @hcrc: header digest enabled
+ * @dcrc: data digest enabled
+ * set up the iscsi digest settings for a connection identified by tid
+ */
+static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
+				 int hcrc, int dcrc)
+{
+	struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
+					GFP_KERNEL);
+	struct cpl_set_tcb_field *req;
+	u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
+	if (!skb)
+		return -ENOMEM;
+
+	/* set up ulp submode and page size */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+	req->reply = V_NO_REPLY(1);
+	req->cpu_idx = 0;
+	req->word = htons(31);
+	req->mask = cpu_to_be64(0x0F000000);
+	req->val = cpu_to_be64(val << 24);
+	skb->priority = CPL_PRIORITY_CONTROL;
+
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return 0;
+}
+
+/**
+ * cxgb3i_ddp_init - initialize the cxgb3 adapter's ddp resource
+ * @cdev: cxgb3i adapter
+ * initialize the ddp pagepod manager for a given adapter
+ */
+static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
+{
+	struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
+	struct net_device *ndev = cdev->ports[0];
+	struct cxgbi_tag_format tformat;
+	unsigned int ppmax, tagmask = 0;
+	struct ulp_iscsi_info uinfo;
+	int i, err;
+
+	err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
+	if (err < 0) {
+		pr_err("%s, failed to get iscsi param %d.\n",
+		       ndev->name, err);
+		return err;
+	}
+	if (uinfo.llimit >= uinfo.ulimit) {
+		pr_warn("T3 %s, iscsi NOT enabled %u ~ %u!\n",
+			ndev->name, uinfo.llimit, uinfo.ulimit);
+		return -EACCES;
+	}
+
+	ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
+	tagmask = cxgbi_tagmask_set(ppmax);
+
+	pr_info("T3 %s: 0x%x~0x%x, 0x%x, tagmask 0x%x -> 0x%x.\n",
+		ndev->name, uinfo.llimit, uinfo.ulimit, ppmax, uinfo.tagmask,
+		tagmask);
+
+	memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
+	for (i = 0; i < 4; i++)
+		tformat.pgsz_order[i] = uinfo.pgsz_factor[i];
+	cxgbi_tagmask_check(tagmask, &tformat);
+
+	cxgbi_ddp_ppm_setup(&tdev->ulp_iscsi, cdev, &tformat, ppmax,
+			    uinfo.llimit, uinfo.llimit, 0);
+	if (!(cdev->flags & CXGBI_FLAG_DDP_OFF)) {
+		uinfo.tagmask = tagmask;
+		uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
+
+		err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
+		if (err < 0) {
+			pr_err("T3 %s fail to set iscsi param %d.\n",
+			       ndev->name, err);
+			cdev->flags |= CXGBI_FLAG_DDP_OFF;
+		}
+		err = 0;
+	}
+
+	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
+	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
+	cdev->csk_ddp_set_map = ddp_set_map;
+	cdev->csk_ddp_clear_map = ddp_clear_map;
+	cdev->cdev2ppm = cdev2ppm;
+	cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+				  uinfo.max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
+	cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+				  uinfo.max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
+
+	return 0;
+}
+
+static void cxgb3i_dev_close(struct t3cdev *t3dev)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+	if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
+		pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
+		return;
+	}
+
+	cxgbi_device_unregister(cdev);
+}
+
+/**
+ * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
+ * @t3dev: t3cdev adapter
+ */
+static void cxgb3i_dev_open(struct t3cdev *t3dev)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+	struct adapter *adapter = tdev2adap(t3dev);
+	int i, err;
+
+	if (cdev) {
+		pr_info("0x%p, updating.\n", cdev);
+		return;
+	}
+
+	cdev = cxgbi_device_register(0, adapter->params.nports);
+	if (!cdev) {
+		pr_warn("device 0x%p register failed.\n", t3dev);
+		return;
+	}
+
+	cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
+	cdev->lldev = t3dev;
+	cdev->pdev = adapter->pdev;
+	cdev->ports = adapter->port;
+	cdev->nports = adapter->params.nports;
+	cdev->mtus = adapter->params.mtus;
+	cdev->nmtus = NMTUS;
+	cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
+	cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
+	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
+	cdev->itp = &cxgb3i_iscsi_transport;
+
+	err = cxgb3i_ddp_init(cdev);
+	if (err) {
+		pr_info("0x%p ddp init failed\n", cdev);
+		goto err_out;
+	}
+
+	err = cxgb3i_ofld_init(cdev);
+	if (err) {
+		pr_info("0x%p offload init failed\n", cdev);
+		goto err_out;
+	}
+
+	err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
+				&cxgb3i_host_template, cxgb3i_stt);
+	if (err)
+		goto err_out;
+
+	for (i = 0; i < cdev->nports; i++)
+		cdev->hbas[i]->ipv4addr =
+			cxgb3i_get_private_ipv4addr(cdev->ports[i]);
+
+	pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
+		cdev, cdev ? cdev->flags : 0, t3dev, err);
+	return;
+
+err_out:
+	cxgbi_device_unregister(cdev);
+}
+
+static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+	log_debug(1 << CXGBI_DBG_TOE,
+		"0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
+		t3dev, cdev, event, port);
+	if (!cdev)
+		return;
+
+	switch (event) {
+	case OFFLOAD_STATUS_DOWN:
+		cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
+		break;
+	case OFFLOAD_STATUS_UP:
+		cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
+		break;
+	}
+}
+
+/**
+ * cxgb3i_init_module - module init entry point
+ *
+ * initialize any driver wide global data structures and register itself
+ *	with the cxgb3 module
+ */
+static int __init cxgb3i_init_module(void)
+{
+	int rc;
+
+	printk(KERN_INFO "%s", version);
+
+	rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+	if (rc < 0)
+		return rc;
+
+	cxgb3_register_client(&t3_client);
+	return 0;
+}
+
+/**
+ * cxgb3i_exit_module - module cleanup/exit entry point
+ *
+ * go through the driver hba list and for each hba, release any resource held.
+ *	and unregisters iscsi transport and the cxgb3 module
+ */
+static void __exit cxgb3i_exit_module(void)
+{
+	cxgb3_unregister_client(&t3_client);
+	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
+	cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+}
+
+module_init(cxgb3i_init_module);
+module_exit(cxgb3i_exit_module);
diff --git a/drivers/scsi/cxgbi/cxgb3i/cxgb3i.h b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.h
new file mode 100644
index 000000000..b0430c935
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb3i/cxgb3i.h
@@ -0,0 +1,62 @@
+/*
+ * cxgb3i.h: Chelsio S3xx iSCSI driver.
+ *
+ * Copyright (c) 2008-2015 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ */
+
+#ifndef __CXGB3I_H__
+#define __CXGB3I_H__
+
+#define CXGB3I_SCSI_HOST_QDEPTH 1024
+#define CXGB3I_MAX_LUN		512
+#define ISCSI_PDU_NONPAYLOAD_MAX \
+	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
+
+/*for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
+#define CXGB3I_TX_HEADER_LEN \
+	(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
+
+extern cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
+
+static inline unsigned int cxgb3i_get_private_ipv4addr(struct net_device *ndev)
+{
+	return ((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr;
+}
+
+static inline void cxgb3i_set_private_ipv4addr(struct net_device *ndev,
+						unsigned int addr)
+{
+	struct port_info *pi =  (struct port_info *)netdev_priv(ndev);
+
+	pi->iscsic.flags = addr ? 1 : 0;
+	pi->iscsi_ipv4addr = addr;
+	if (addr)
+		memcpy(pi->iscsic.mac_addr, ndev->dev_addr, ETH_ALEN);
+}
+
+struct cpl_iscsi_hdr_norss {
+	union opcode_tid ot;
+	u16 pdu_len_ddp;
+	u16 len;
+	u32 seq;
+	u16 urg;
+	u8 rsvd;
+	u8 status;
+};
+
+struct cpl_rx_data_ddp_norss {
+	union opcode_tid ot;
+	u16 urg;
+	u16 len;
+	u32 seq;
+	u32 nxt_seq;
+	u32 ulp_crc;
+	u32 ddp_status;
+};
+#endif
diff --git a/drivers/scsi/cxgbi/cxgb4i/Kbuild b/drivers/scsi/cxgbi/cxgb4i/Kbuild
new file mode 100644
index 000000000..38e03c280
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb4i/Kbuild
@@ -0,0 +1,4 @@
+ccflags-y += -I$(srctree)/drivers/net/ethernet/chelsio/cxgb4
+ccflags-y += -I$(srctree)/drivers/net/ethernet/chelsio/libcxgb
+
+obj-$(CONFIG_SCSI_CXGB4_ISCSI) += cxgb4i.o
diff --git a/drivers/scsi/cxgbi/cxgb4i/Kconfig b/drivers/scsi/cxgbi/cxgb4i/Kconfig
new file mode 100644
index 000000000..594f593c8
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb4i/Kconfig
@@ -0,0 +1,11 @@
+config SCSI_CXGB4_ISCSI
+	tristate "Chelsio T4 iSCSI support"
+	depends on PCI && INET && (IPV6 || IPV6=n)
+	select NETDEVICES
+	select ETHERNET
+	select NET_VENDOR_CHELSIO
+	select CHELSIO_T4
+	select CHELSIO_LIB
+	select SCSI_ISCSI_ATTRS
+	---help---
+	  This driver supports iSCSI offload for the Chelsio T4 devices.
diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
new file mode 100644
index 000000000..689d6c813
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
@@ -0,0 +1,2183 @@
+/*
+ * cxgb4i.c: Chelsio T4 iSCSI driver.
+ *
+ * Copyright (c) 2010-2015 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by:	Karen Xie (kxie@chelsio.com)
+ *		Rakesh Ranjan (rranjan@chelsio.com)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <scsi/scsi_host.h>
+#include <net/tcp.h>
+#include <net/dst.h>
+#include <linux/netdevice.h>
+#include <net/addrconf.h>
+
+#include "t4_regs.h"
+#include "t4_msg.h"
+#include "cxgb4.h"
+#include "cxgb4_uld.h"
+#include "t4fw_api.h"
+#include "l2t.h"
+#include "cxgb4i.h"
+#include "clip_tbl.h"
+
+static unsigned int dbg_level;
+
+#include "../libcxgbi.h"
+
+#define	DRV_MODULE_NAME		"cxgb4i"
+#define DRV_MODULE_DESC		"Chelsio T4-T6 iSCSI Driver"
+#define	DRV_MODULE_VERSION	"0.9.5-ko"
+#define DRV_MODULE_RELDATE	"Apr. 2015"
+
+static char version[] =
+	DRV_MODULE_DESC " " DRV_MODULE_NAME
+	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Chelsio Communications, Inc.");
+MODULE_DESCRIPTION(DRV_MODULE_DESC);
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(dbg_level, uint, 0644);
+MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
+
+#define CXGB4I_DEFAULT_10G_RCV_WIN (256 * 1024)
+static int cxgb4i_rcv_win = -1;
+module_param(cxgb4i_rcv_win, int, 0644);
+MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
+
+#define CXGB4I_DEFAULT_10G_SND_WIN (128 * 1024)
+static int cxgb4i_snd_win = -1;
+module_param(cxgb4i_snd_win, int, 0644);
+MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
+
+static int cxgb4i_rx_credit_thres = 10 * 1024;
+module_param(cxgb4i_rx_credit_thres, int, 0644);
+MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
+		"RX credits return threshold in bytes (default=10KB)");
+
+static unsigned int cxgb4i_max_connect = (8 * 1024);
+module_param(cxgb4i_max_connect, uint, 0644);
+MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
+
+static unsigned short cxgb4i_sport_base = 20000;
+module_param(cxgb4i_sport_base, ushort, 0644);
+MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
+
+typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
+
+static void *t4_uld_add(const struct cxgb4_lld_info *);
+static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
+static int t4_uld_state_change(void *, enum cxgb4_state state);
+static inline int send_tx_flowc_wr(struct cxgbi_sock *);
+
+static const struct cxgb4_uld_info cxgb4i_uld_info = {
+	.name = DRV_MODULE_NAME,
+	.nrxq = MAX_ULD_QSETS,
+	.ntxq = MAX_ULD_QSETS,
+	.rxq_size = 1024,
+	.lro = false,
+	.add = t4_uld_add,
+	.rx_handler = t4_uld_rx_handler,
+	.state_change = t4_uld_state_change,
+};
+
+static struct scsi_host_template cxgb4i_host_template = {
+	.module		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	.proc_name	= DRV_MODULE_NAME,
+	.can_queue	= CXGB4I_SCSI_HOST_QDEPTH,
+	.queuecommand	= iscsi_queuecommand,
+	.change_queue_depth = scsi_change_queue_depth,
+	.sg_tablesize	= SG_ALL,
+	.max_sectors	= 0xFFFF,
+	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
+	.eh_timed_out	= iscsi_eh_cmd_timed_out,
+	.eh_abort_handler = iscsi_eh_abort,
+	.eh_device_reset_handler = iscsi_eh_device_reset,
+	.eh_target_reset_handler = iscsi_eh_recover_target,
+	.target_alloc	= iscsi_target_alloc,
+	.use_clustering	= DISABLE_CLUSTERING,
+	.this_id	= -1,
+	.track_queue_depth = 1,
+};
+
+static struct iscsi_transport cxgb4i_iscsi_transport = {
+	.owner		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
+				CAP_DATADGST | CAP_DIGEST_OFFLOAD |
+				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
+	.attr_is_visible	= cxgbi_attr_is_visible,
+	.get_host_param	= cxgbi_get_host_param,
+	.set_host_param	= cxgbi_set_host_param,
+	/* session management */
+	.create_session	= cxgbi_create_session,
+	.destroy_session	= cxgbi_destroy_session,
+	.get_session_param = iscsi_session_get_param,
+	/* connection management */
+	.create_conn	= cxgbi_create_conn,
+	.bind_conn		= cxgbi_bind_conn,
+	.destroy_conn	= iscsi_tcp_conn_teardown,
+	.start_conn		= iscsi_conn_start,
+	.stop_conn		= iscsi_conn_stop,
+	.get_conn_param	= iscsi_conn_get_param,
+	.set_param	= cxgbi_set_conn_param,
+	.get_stats	= cxgbi_get_conn_stats,
+	/* pdu xmit req from user space */
+	.send_pdu	= iscsi_conn_send_pdu,
+	/* task */
+	.init_task	= iscsi_tcp_task_init,
+	.xmit_task	= iscsi_tcp_task_xmit,
+	.cleanup_task	= cxgbi_cleanup_task,
+	/* pdu */
+	.alloc_pdu	= cxgbi_conn_alloc_pdu,
+	.init_pdu	= cxgbi_conn_init_pdu,
+	.xmit_pdu	= cxgbi_conn_xmit_pdu,
+	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
+	/* TCP connect/disconnect */
+	.get_ep_param	= cxgbi_get_ep_param,
+	.ep_connect	= cxgbi_ep_connect,
+	.ep_poll	= cxgbi_ep_poll,
+	.ep_disconnect	= cxgbi_ep_disconnect,
+	/* Error recovery timeout call */
+	.session_recovery_timedout = iscsi_session_recovery_timedout,
+};
+
+static struct scsi_transport_template *cxgb4i_stt;
+
+/*
+ * CPL (Chelsio Protocol Language) defines a message passing interface between
+ * the host driver and Chelsio asic.
+ * The section below implments CPLs that related to iscsi tcp connection
+ * open/close/abort and data send/receive.
+ */
+
+#define RCV_BUFSIZ_MASK		0x3FFU
+#define MAX_IMM_TX_PKT_LEN	256
+
+static int push_tx_frames(struct cxgbi_sock *, int);
+
+/*
+ * is_ofld_imm - check whether a packet can be sent as immediate data
+ * @skb: the packet
+ *
+ * Returns true if a packet can be sent as an offload WR with immediate
+ * data.  We currently use the same limit as for Ethernet packets.
+ */
+static inline bool is_ofld_imm(const struct sk_buff *skb)
+{
+	int len = skb->len;
+
+	if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
+		len += sizeof(struct fw_ofld_tx_data_wr);
+
+	return len <= MAX_IMM_TX_PKT_LEN;
+}
+
+static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
+				struct l2t_entry *e)
+{
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
+	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
+	unsigned long long opt0;
+	unsigned int opt2;
+	unsigned int qid_atid = ((unsigned int)csk->atid) |
+				 (((unsigned int)csk->rss_qid) << 14);
+
+	opt0 = KEEP_ALIVE_F |
+		WND_SCALE_V(wscale) |
+		MSS_IDX_V(csk->mss_idx) |
+		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
+		TX_CHAN_V(csk->tx_chan) |
+		SMAC_SEL_V(csk->smac_idx) |
+		ULP_MODE_V(ULP_MODE_ISCSI) |
+		RCV_BUFSIZ_V(csk->rcv_win >> 10);
+
+	opt2 = RX_CHANNEL_V(0) |
+		RSS_QUEUE_VALID_F |
+		RSS_QUEUE_V(csk->rss_qid);
+
+	if (is_t4(lldi->adapter_type)) {
+		struct cpl_act_open_req *req =
+				(struct cpl_act_open_req *)skb->head;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
+					qid_atid));
+		req->local_port = csk->saddr.sin_port;
+		req->peer_port = csk->daddr.sin_port;
+		req->local_ip = csk->saddr.sin_addr.s_addr;
+		req->peer_ip = csk->daddr.sin_addr.s_addr;
+		req->opt0 = cpu_to_be64(opt0);
+		req->params = cpu_to_be32(cxgb4_select_ntuple(
+					csk->cdev->ports[csk->port_id],
+					csk->l2t));
+		opt2 |= RX_FC_VALID_F;
+		req->opt2 = cpu_to_be32(opt2);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
+			csk, &req->local_ip, ntohs(req->local_port),
+			&req->peer_ip, ntohs(req->peer_port),
+			csk->atid, csk->rss_qid);
+	} else if (is_t5(lldi->adapter_type)) {
+		struct cpl_t5_act_open_req *req =
+				(struct cpl_t5_act_open_req *)skb->head;
+		u32 isn = (prandom_u32() & ~7UL) - 1;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
+					qid_atid));
+		req->local_port = csk->saddr.sin_port;
+		req->peer_port = csk->daddr.sin_port;
+		req->local_ip = csk->saddr.sin_addr.s_addr;
+		req->peer_ip = csk->daddr.sin_addr.s_addr;
+		req->opt0 = cpu_to_be64(opt0);
+		req->params = cpu_to_be64(FILTER_TUPLE_V(
+				cxgb4_select_ntuple(
+					csk->cdev->ports[csk->port_id],
+					csk->l2t)));
+		req->rsvd = cpu_to_be32(isn);
+		opt2 |= T5_ISS_VALID;
+		opt2 |= T5_OPT_2_VALID_F;
+
+		req->opt2 = cpu_to_be32(opt2);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
+			csk, &req->local_ip, ntohs(req->local_port),
+			&req->peer_ip, ntohs(req->peer_port),
+			csk->atid, csk->rss_qid);
+	} else {
+		struct cpl_t6_act_open_req *req =
+				(struct cpl_t6_act_open_req *)skb->head;
+		u32 isn = (prandom_u32() & ~7UL) - 1;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
+							    qid_atid));
+		req->local_port = csk->saddr.sin_port;
+		req->peer_port = csk->daddr.sin_port;
+		req->local_ip = csk->saddr.sin_addr.s_addr;
+		req->peer_ip = csk->daddr.sin_addr.s_addr;
+		req->opt0 = cpu_to_be64(opt0);
+		req->params = cpu_to_be64(FILTER_TUPLE_V(
+				cxgb4_select_ntuple(
+					csk->cdev->ports[csk->port_id],
+					csk->l2t)));
+		req->rsvd = cpu_to_be32(isn);
+
+		opt2 |= T5_ISS_VALID;
+		opt2 |= RX_FC_DISABLE_F;
+		opt2 |= T5_OPT_2_VALID_F;
+
+		req->opt2 = cpu_to_be32(opt2);
+		req->rsvd2 = cpu_to_be32(0);
+		req->opt3 = cpu_to_be32(0);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			  "csk t6 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
+			  csk, &req->local_ip, ntohs(req->local_port),
+			  &req->peer_ip, ntohs(req->peer_port),
+			  csk->atid, csk->rss_qid);
+	}
+
+	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
+
+	pr_info_ipaddr("t%d csk 0x%p,%u,0x%lx,%u, rss_qid %u.\n",
+		       (&csk->saddr), (&csk->daddr),
+		       CHELSIO_CHIP_VERSION(lldi->adapter_type), csk,
+		       csk->state, csk->flags, csk->atid, csk->rss_qid);
+
+	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
+			       struct l2t_entry *e)
+{
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
+	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
+	unsigned long long opt0;
+	unsigned int opt2;
+	unsigned int qid_atid = ((unsigned int)csk->atid) |
+				 (((unsigned int)csk->rss_qid) << 14);
+
+	opt0 = KEEP_ALIVE_F |
+		WND_SCALE_V(wscale) |
+		MSS_IDX_V(csk->mss_idx) |
+		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
+		TX_CHAN_V(csk->tx_chan) |
+		SMAC_SEL_V(csk->smac_idx) |
+		ULP_MODE_V(ULP_MODE_ISCSI) |
+		RCV_BUFSIZ_V(csk->rcv_win >> 10);
+
+	opt2 = RX_CHANNEL_V(0) |
+		RSS_QUEUE_VALID_F |
+		RSS_QUEUE_V(csk->rss_qid);
+
+	if (is_t4(lldi->adapter_type)) {
+		struct cpl_act_open_req6 *req =
+			    (struct cpl_act_open_req6 *)skb->head;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
+							    qid_atid));
+		req->local_port = csk->saddr6.sin6_port;
+		req->peer_port = csk->daddr6.sin6_port;
+
+		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
+		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
+								    8);
+		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
+		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
+								    8);
+
+		req->opt0 = cpu_to_be64(opt0);
+
+		opt2 |= RX_FC_VALID_F;
+		req->opt2 = cpu_to_be32(opt2);
+
+		req->params = cpu_to_be32(cxgb4_select_ntuple(
+					  csk->cdev->ports[csk->port_id],
+					  csk->l2t));
+	} else if (is_t5(lldi->adapter_type)) {
+		struct cpl_t5_act_open_req6 *req =
+				(struct cpl_t5_act_open_req6 *)skb->head;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
+							    qid_atid));
+		req->local_port = csk->saddr6.sin6_port;
+		req->peer_port = csk->daddr6.sin6_port;
+		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
+		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
+									8);
+		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
+		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
+									8);
+		req->opt0 = cpu_to_be64(opt0);
+
+		opt2 |= T5_OPT_2_VALID_F;
+		req->opt2 = cpu_to_be32(opt2);
+
+		req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
+					  csk->cdev->ports[csk->port_id],
+					  csk->l2t)));
+	} else {
+		struct cpl_t6_act_open_req6 *req =
+				(struct cpl_t6_act_open_req6 *)skb->head;
+
+		INIT_TP_WR(req, 0);
+		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
+							    qid_atid));
+		req->local_port = csk->saddr6.sin6_port;
+		req->peer_port = csk->daddr6.sin6_port;
+		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
+		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
+									8);
+		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
+		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
+									8);
+		req->opt0 = cpu_to_be64(opt0);
+
+		opt2 |= RX_FC_DISABLE_F;
+		opt2 |= T5_OPT_2_VALID_F;
+
+		req->opt2 = cpu_to_be32(opt2);
+
+		req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
+					  csk->cdev->ports[csk->port_id],
+					  csk->l2t)));
+
+		req->rsvd2 = cpu_to_be32(0);
+		req->opt3 = cpu_to_be32(0);
+	}
+
+	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
+
+	pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
+		CHELSIO_CHIP_VERSION(lldi->adapter_type), csk, csk->state,
+		csk->flags, csk->atid,
+		&csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
+		&csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
+		csk->rss_qid);
+
+	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
+}
+#endif
+
+static void send_close_req(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->cpl_close;
+	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
+	unsigned int tid = csk->tid;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, tid %u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+	csk->cpl_close = NULL;
+	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+	INIT_TP_WR(req, tid);
+	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
+	req->rsvd = 0;
+
+	cxgbi_sock_skb_entail(csk, skb);
+	if (csk->state >= CTP_ESTABLISHED)
+		push_tx_frames(csk, 1);
+}
+
+static void abort_arp_failure(void *handle, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
+	struct cpl_abort_req *req;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, tid %u, abort.\n",
+		csk, csk->state, csk->flags, csk->tid);
+	req = (struct cpl_abort_req *)skb->data;
+	req->cmd = CPL_ABORT_NO_RST;
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+}
+
+static void send_abort_req(struct cxgbi_sock *csk)
+{
+	struct cpl_abort_req *req;
+	struct sk_buff *skb = csk->cpl_abort_req;
+
+	if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
+		return;
+
+	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+		send_tx_flowc_wr(csk);
+		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+	}
+
+	cxgbi_sock_set_state(csk, CTP_ABORTING);
+	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
+	cxgbi_sock_purge_write_queue(csk);
+
+	csk->cpl_abort_req = NULL;
+	req = (struct cpl_abort_req *)skb->head;
+	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+	req->cmd = CPL_ABORT_SEND_RST;
+	t4_set_arp_err_handler(skb, csk, abort_arp_failure);
+	INIT_TP_WR(req, csk->tid);
+	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
+	req->rsvd0 = htonl(csk->snd_nxt);
+	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
+		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
+		req->rsvd1);
+
+	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
+}
+
+static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
+{
+	struct sk_buff *skb = csk->cpl_abort_rpl;
+	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
+		csk, csk->state, csk->flags, csk->tid, rst_status);
+
+	csk->cpl_abort_rpl = NULL;
+	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+	INIT_TP_WR(rpl, csk->tid);
+	OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
+	rpl->cmd = rst_status;
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+}
+
+/*
+ * CPL connection rx data ack: host ->
+ * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
+ * credits sent.
+ */
+static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
+{
+	struct sk_buff *skb;
+	struct cpl_rx_data_ack *req;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, credit %u.\n",
+		csk, csk->state, csk->flags, csk->tid, credits);
+
+	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
+	if (!skb) {
+		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
+		return 0;
+	}
+	req = (struct cpl_rx_data_ack *)skb->head;
+
+	set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
+	INIT_TP_WR(req, csk->tid);
+	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
+				      csk->tid));
+	req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits)
+				       | RX_FORCE_ACK_F);
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+	return credits;
+}
+
+/*
+ * sgl_len - calculates the size of an SGL of the given capacity
+ * @n: the number of SGL entries
+ * Calculates the number of flits needed for a scatter/gather list that
+ * can hold the given number of entries.
+ */
+static inline unsigned int sgl_len(unsigned int n)
+{
+	n--;
+	return (3 * n) / 2 + (n & 1) + 2;
+}
+
+/*
+ * calc_tx_flits_ofld - calculate # of flits for an offload packet
+ * @skb: the packet
+ *
+ * Returns the number of flits needed for the given offload packet.
+ * These packets are already fully constructed and no additional headers
+ * will be added.
+ */
+static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
+{
+	unsigned int flits, cnt;
+
+	if (is_ofld_imm(skb))
+		return DIV_ROUND_UP(skb->len, 8);
+	flits = skb_transport_offset(skb) / 8;
+	cnt = skb_shinfo(skb)->nr_frags;
+	if (skb_tail_pointer(skb) != skb_transport_header(skb))
+		cnt++;
+	return flits + sgl_len(cnt);
+}
+
+#define FLOWC_WR_NPARAMS_MIN	9
+static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
+{
+	int nparams, flowclen16, flowclen;
+
+	nparams = FLOWC_WR_NPARAMS_MIN;
+	flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
+	flowclen16 = DIV_ROUND_UP(flowclen, 16);
+	flowclen = flowclen16 * 16;
+	/*
+	 * Return the number of 16-byte credits used by the FlowC request.
+	 * Pass back the nparams and actual FlowC length if requested.
+	 */
+	if (nparamsp)
+		*nparamsp = nparams;
+	if (flowclenp)
+		*flowclenp = flowclen;
+
+	return flowclen16;
+}
+
+static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb;
+	struct fw_flowc_wr *flowc;
+	int nparams, flowclen16, flowclen;
+
+	flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
+	skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
+	flowc = (struct fw_flowc_wr *)skb->head;
+	flowc->op_to_nparams =
+		htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));
+	flowc->flowid_len16 =
+		htonl(FW_WR_LEN16_V(flowclen16) | FW_WR_FLOWID_V(csk->tid));
+	flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
+	flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
+	flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
+	flowc->mnemval[1].val = htonl(csk->tx_chan);
+	flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
+	flowc->mnemval[2].val = htonl(csk->tx_chan);
+	flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
+	flowc->mnemval[3].val = htonl(csk->rss_qid);
+	flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
+	flowc->mnemval[4].val = htonl(csk->snd_nxt);
+	flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
+	flowc->mnemval[5].val = htonl(csk->rcv_nxt);
+	flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
+	flowc->mnemval[6].val = htonl(csk->snd_win);
+	flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
+	flowc->mnemval[7].val = htonl(csk->advmss);
+	flowc->mnemval[8].mnemonic = 0;
+	flowc->mnemval[8].val = 0;
+	flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
+	flowc->mnemval[8].val = 16384;
+
+	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
+		csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
+		csk->snd_nxt, csk->rcv_nxt, csk->snd_win,
+		csk->advmss);
+
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+
+	return flowclen16;
+}
+
+static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
+				   int dlen, int len, u32 credits, int compl)
+{
+	struct fw_ofld_tx_data_wr *req;
+	unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
+	unsigned int wr_ulp_mode = 0, val;
+	bool imm = is_ofld_imm(skb);
+
+	req = __skb_push(skb, sizeof(*req));
+
+	if (imm) {
+		req->op_to_immdlen = htonl(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
+					FW_WR_COMPL_F |
+					FW_WR_IMMDLEN_V(dlen));
+		req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
+						FW_WR_LEN16_V(credits));
+	} else {
+		req->op_to_immdlen =
+			cpu_to_be32(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
+					FW_WR_COMPL_F |
+					FW_WR_IMMDLEN_V(0));
+		req->flowid_len16 =
+			cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
+					FW_WR_LEN16_V(credits));
+	}
+	if (submode)
+		wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP2_MODE_ISCSI) |
+				FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
+	val = skb_peek(&csk->write_queue) ? 0 : 1;
+	req->tunnel_to_proxy = htonl(wr_ulp_mode |
+				     FW_OFLD_TX_DATA_WR_SHOVE_V(val));
+	req->plen = htonl(len);
+	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
+		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+}
+
+static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
+{
+	kfree_skb(skb);
+}
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
+{
+	int total_size = 0;
+	struct sk_buff *skb;
+
+	if (unlikely(csk->state < CTP_ESTABLISHED ||
+		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
+			 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		return 0;
+	}
+
+	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
+		int dlen = skb->len;
+		int len = skb->len;
+		unsigned int credits_needed;
+		int flowclen16 = 0;
+
+		skb_reset_transport_header(skb);
+		if (is_ofld_imm(skb))
+			credits_needed = DIV_ROUND_UP(dlen, 16);
+		else
+			credits_needed = DIV_ROUND_UP(
+						8 * calc_tx_flits_ofld(skb),
+						16);
+
+		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
+			credits_needed += DIV_ROUND_UP(
+					sizeof(struct fw_ofld_tx_data_wr),
+					16);
+
+		/*
+		 * Assumes the initial credits is large enough to support
+		 * fw_flowc_wr plus largest possible first payload
+		 */
+		if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+			flowclen16 = send_tx_flowc_wr(csk);
+			csk->wr_cred -= flowclen16;
+			csk->wr_una_cred += flowclen16;
+			cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+		}
+
+		if (csk->wr_cred < credits_needed) {
+			log_debug(1 << CXGBI_DBG_PDU_TX,
+				"csk 0x%p, skb %u/%u, wr %d < %u.\n",
+				csk, skb->len, skb->data_len,
+				credits_needed, csk->wr_cred);
+			break;
+		}
+		__skb_unlink(skb, &csk->write_queue);
+		set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+		skb->csum = credits_needed + flowclen16;
+		csk->wr_cred -= credits_needed;
+		csk->wr_una_cred += credits_needed;
+		cxgbi_sock_enqueue_wr(csk, skb);
+
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
+			csk, skb->len, skb->data_len, credits_needed,
+			csk->wr_cred, csk->wr_una_cred);
+
+		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
+			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
+			make_tx_data_wr(csk, skb, dlen, len, credits_needed,
+					req_completion);
+			csk->snd_nxt += len;
+			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
+		} else if (cxgbi_skcb_test_flag(skb, SKCBF_TX_FLAG_COMPL) &&
+			   (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
+			struct cpl_close_con_req *req =
+				(struct cpl_close_con_req *)skb->data;
+			req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
+		}
+		total_size += skb->truesize;
+		t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
+			csk, csk->state, csk->flags, csk->tid, skb, len);
+
+		cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
+	}
+	return total_size;
+}
+
+static inline void free_atid(struct cxgbi_sock *csk)
+{
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
+
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
+		cxgb4_free_atid(lldi->tids, csk->atid);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
+		cxgbi_sock_put(csk);
+	}
+}
+
+static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
+	unsigned short tcp_opt = ntohs(req->tcp_opt);
+	unsigned int tid = GET_TID(req);
+	unsigned int atid = TID_TID_G(ntohl(req->tos_atid));
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	u32 rcv_isn = be32_to_cpu(req->rcv_isn);
+
+	csk = lookup_atid(t, atid);
+	if (unlikely(!csk)) {
+		pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
+		goto rel_skb;
+	}
+
+	if (csk->atid != atid) {
+		pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
+			atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
+		goto rel_skb;
+	}
+
+	pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
+		       (&csk->saddr), (&csk->daddr),
+		       atid, tid, csk, csk->state, csk->flags, rcv_isn);
+
+	module_put(cdev->owner);
+
+	cxgbi_sock_get(csk);
+	csk->tid = tid;
+	cxgb4_insert_tid(lldi->tids, csk, tid, csk->csk_family);
+	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
+
+	free_atid(csk);
+
+	spin_lock_bh(&csk->lock);
+	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
+		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
+			csk, csk->state, csk->flags, csk->tid);
+
+	if (csk->retry_timer.function) {
+		del_timer(&csk->retry_timer);
+		csk->retry_timer.function = NULL;
+	}
+
+	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
+	/*
+	 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
+	 * pass through opt0.
+	 */
+	if (csk->rcv_win > (RCV_BUFSIZ_MASK << 10))
+		csk->rcv_wup -= csk->rcv_win - (RCV_BUFSIZ_MASK << 10);
+
+	csk->advmss = lldi->mtus[TCPOPT_MSS_G(tcp_opt)] - 40;
+	if (TCPOPT_TSTAMP_G(tcp_opt))
+		csk->advmss -= 12;
+	if (csk->advmss < 128)
+		csk->advmss = 128;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p, mss_idx %u, advmss %u.\n",
+			csk, TCPOPT_MSS_G(tcp_opt), csk->advmss);
+
+	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
+
+	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
+		send_abort_req(csk);
+	else {
+		if (skb_queue_len(&csk->write_queue))
+			push_tx_frames(csk, 0);
+		cxgbi_conn_tx_open(csk);
+	}
+	spin_unlock_bh(&csk->lock);
+
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static int act_open_rpl_status_to_errno(int status)
+{
+	switch (status) {
+	case CPL_ERR_CONN_RESET:
+		return -ECONNREFUSED;
+	case CPL_ERR_ARP_MISS:
+		return -EHOSTUNREACH;
+	case CPL_ERR_CONN_TIMEDOUT:
+		return -ETIMEDOUT;
+	case CPL_ERR_TCAM_FULL:
+		return -ENOMEM;
+	case CPL_ERR_CONN_EXIST:
+		return -EADDRINUSE;
+	default:
+		return -EIO;
+	}
+}
+
+static void csk_act_open_retry_timer(struct timer_list *t)
+{
+	struct sk_buff *skb = NULL;
+	struct cxgbi_sock *csk = from_timer(csk, t, retry_timer);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
+	void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
+				   struct l2t_entry *);
+	int t4 = is_t4(lldi->adapter_type), size, size6;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	if (t4) {
+		size = sizeof(struct cpl_act_open_req);
+		size6 = sizeof(struct cpl_act_open_req6);
+	} else {
+		size = sizeof(struct cpl_t5_act_open_req);
+		size6 = sizeof(struct cpl_t5_act_open_req6);
+	}
+
+	if (csk->csk_family == AF_INET) {
+		send_act_open_func = send_act_open_req;
+		skb = alloc_wr(size, 0, GFP_ATOMIC);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		send_act_open_func = send_act_open_req6;
+		skb = alloc_wr(size6, 0, GFP_ATOMIC);
+#endif
+	}
+
+	if (!skb)
+		cxgbi_sock_fail_act_open(csk, -ENOMEM);
+	else {
+		skb->sk = (struct sock *)csk;
+		t4_set_arp_err_handler(skb, csk,
+				       cxgbi_sock_act_open_req_arp_failure);
+		send_act_open_func(csk, skb, csk->l2t);
+	}
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+
+}
+
+static inline bool is_neg_adv(unsigned int status)
+{
+	return status == CPL_ERR_RTX_NEG_ADVICE ||
+		status == CPL_ERR_KEEPALV_NEG_ADVICE ||
+		status == CPL_ERR_PERSIST_NEG_ADVICE;
+}
+
+static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	unsigned int atid =
+		TID_TID_G(AOPEN_ATID_G(be32_to_cpu(rpl->atid_status)));
+	unsigned int status = AOPEN_STATUS_G(be32_to_cpu(rpl->atid_status));
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_atid(t, atid);
+	if (unlikely(!csk)) {
+		pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
+		goto rel_skb;
+	}
+
+	pr_info_ipaddr("tid %u/%u, status %u.\n"
+		       "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
+		       atid, tid, status, csk, csk->state, csk->flags);
+
+	if (is_neg_adv(status))
+		goto rel_skb;
+
+	module_put(cdev->owner);
+
+	if (status && status != CPL_ERR_TCAM_FULL &&
+	    status != CPL_ERR_CONN_EXIST &&
+	    status != CPL_ERR_ARP_MISS)
+		cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl),
+				 csk->csk_family);
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	if (status == CPL_ERR_CONN_EXIST &&
+	    csk->retry_timer.function != csk_act_open_retry_timer) {
+		csk->retry_timer.function = csk_act_open_retry_timer;
+		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
+	} else
+		cxgbi_sock_fail_act_open(csk,
+					act_open_rpl_status_to_errno(status));
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
+	unsigned int tid = GET_TID(req);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find connection for tid %u.\n", tid);
+		goto rel_skb;
+	}
+	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
+		       (&csk->saddr), (&csk->daddr),
+		       csk, csk->state, csk->flags, csk->tid);
+	cxgbi_sock_rcv_peer_close(csk);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find connection for tid %u.\n", tid);
+		goto rel_skb;
+	}
+	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
+		       (&csk->saddr), (&csk->daddr),
+		       csk, csk->state, csk->flags, csk->tid);
+	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
+								int *need_rst)
+{
+	switch (abort_reason) {
+	case CPL_ERR_BAD_SYN: /* fall through */
+	case CPL_ERR_CONN_RESET:
+		return csk->state > CTP_ESTABLISHED ?
+			-EPIPE : -ECONNRESET;
+	case CPL_ERR_XMIT_TIMEDOUT:
+	case CPL_ERR_PERSIST_TIMEDOUT:
+	case CPL_ERR_FINWAIT2_TIMEDOUT:
+	case CPL_ERR_KEEPALIVE_TIMEDOUT:
+		return -ETIMEDOUT;
+	default:
+		return -EIO;
+	}
+}
+
+static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
+	unsigned int tid = GET_TID(req);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	int rst_status = CPL_ABORT_NO_RST;
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find connection for tid %u.\n", tid);
+		goto rel_skb;
+	}
+
+	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
+		       (&csk->saddr), (&csk->daddr),
+		       csk, csk->state, csk->flags, csk->tid, req->status);
+
+	if (is_neg_adv(req->status))
+		goto rel_skb;
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
+
+	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+		send_tx_flowc_wr(csk);
+		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+	}
+
+	cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
+	cxgbi_sock_set_state(csk, CTP_ABORTING);
+
+	send_abort_rpl(csk, rst_status);
+
+	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
+		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
+		cxgbi_sock_closed(csk);
+	}
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (!csk)
+		goto rel_skb;
+
+	if (csk)
+		pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
+			       (&csk->saddr), (&csk->daddr), csk,
+			       csk->state, csk->flags, csk->tid, rpl->status);
+
+	if (rpl->status == CPL_ERR_ABORT_FAILED)
+		goto rel_skb;
+
+	cxgbi_sock_rcv_abort_rpl(csk);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
+	unsigned int tid = GET_TID(cpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (!csk) {
+		pr_err("can't find connection for tid %u.\n", tid);
+	} else {
+		/* not expecting this, reset the connection. */
+		pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
+		spin_lock_bh(&csk->lock);
+		send_abort_req(csk);
+		spin_unlock_bh(&csk->lock);
+	}
+	__kfree_skb(skb);
+}
+
+static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
+	unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
+	unsigned int tid = GET_TID(cpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find conn. for tid %u.\n", tid);
+		goto rel_skb;
+	}
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
+		csk, csk->state, csk->flags, csk->tid, skb, skb->len,
+		pdu_len_ddp);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
+	cxgbi_skcb_flags(skb) = 0;
+
+	skb_reset_transport_header(skb);
+	__skb_pull(skb, sizeof(*cpl));
+	__pskb_trim(skb, ntohs(cpl->len));
+
+	if (!csk->skb_ulp_lhdr) {
+		unsigned char *bhs;
+		unsigned int hlen, dlen, plen;
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+			"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
+			csk, csk->state, csk->flags, csk->tid, skb);
+		csk->skb_ulp_lhdr = skb;
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
+
+		if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
+			pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
+				csk->tid, cxgbi_skcb_tcp_seq(skb),
+				csk->rcv_nxt);
+			goto abort_conn;
+		}
+
+		bhs = skb->data;
+		hlen = ntohs(cpl->len);
+		dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
+
+		plen = ISCSI_PDU_LEN_G(pdu_len_ddp);
+		if (is_t4(lldi->adapter_type))
+			plen -= 40;
+
+		if ((hlen + dlen) != plen) {
+			pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
+				"mismatch %u != %u + %u, seq 0x%x.\n",
+				csk->tid, plen, hlen, dlen,
+				cxgbi_skcb_tcp_seq(skb));
+			goto abort_conn;
+		}
+
+		cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
+		if (dlen)
+			cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
+		csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+			"csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
+			csk, skb, *bhs, hlen, dlen,
+			ntohl(*((unsigned int *)(bhs + 16))),
+			ntohl(*((unsigned int *)(bhs + 24))));
+
+	} else {
+		struct sk_buff *lskb = csk->skb_ulp_lhdr;
+
+		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+			"csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
+			csk, csk->state, csk->flags, skb, lskb);
+	}
+
+	__skb_queue_tail(&csk->receive_queue, skb);
+	spin_unlock_bh(&csk->lock);
+	return;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_rx_iscsi_data(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	struct sk_buff *lskb;
+	u32 tid = GET_TID(cpl);
+	u16 pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find conn. for tid %u.\n", tid);
+		goto rel_skb;
+	}
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		  "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
+		  csk, csk->state, csk->flags, csk->tid, skb,
+		  skb->len, pdu_len_ddp);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			  "csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			  csk, csk->state, csk->flags, csk->tid);
+
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	cxgbi_skcb_tcp_seq(skb) = be32_to_cpu(cpl->seq);
+	cxgbi_skcb_flags(skb) = 0;
+
+	skb_reset_transport_header(skb);
+	__skb_pull(skb, sizeof(*cpl));
+	__pskb_trim(skb, ntohs(cpl->len));
+
+	if (!csk->skb_ulp_lhdr)
+		csk->skb_ulp_lhdr = skb;
+
+	lskb = csk->skb_ulp_lhdr;
+	cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		  "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
+		  csk, csk->state, csk->flags, skb, lskb);
+
+	__skb_queue_tail(&csk->receive_queue, skb);
+	spin_unlock_bh(&csk->lock);
+	return;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void
+cxgb4i_process_ddpvld(struct cxgbi_sock *csk,
+		      struct sk_buff *skb, u32 ddpvld)
+{
+	if (ddpvld & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
+		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
+			csk, skb, ddpvld, cxgbi_skcb_flags(skb));
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
+	}
+
+	if (ddpvld & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
+		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
+			csk, skb, ddpvld, cxgbi_skcb_flags(skb));
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
+	}
+
+	if (ddpvld & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			  "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
+			  csk, skb, ddpvld);
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
+	}
+
+	if ((ddpvld & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
+	    !cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			  "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
+			  csk, skb, ddpvld);
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
+	}
+}
+
+static void do_rx_data_ddp(struct cxgbi_device *cdev,
+				  struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct sk_buff *lskb;
+	struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	u32 ddpvld = be32_to_cpu(rpl->ddpvld);
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find connection for tid %u.\n", tid);
+		goto rel_skb;
+	}
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
+		csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	if (!csk->skb_ulp_lhdr) {
+		pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
+		goto abort_conn;
+	}
+
+	lskb = csk->skb_ulp_lhdr;
+	csk->skb_ulp_lhdr = NULL;
+
+	cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
+
+	if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
+		pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
+			csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
+
+	cxgb4i_process_ddpvld(csk, lskb, ddpvld);
+
+	log_debug(1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p, lskb 0x%p, f 0x%lx.\n",
+		csk, lskb, cxgbi_skcb_flags(lskb));
+
+	cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
+	cxgbi_conn_pdu_ready(csk);
+	spin_unlock_bh(&csk->lock);
+	goto rel_skb;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void
+do_rx_iscsi_cmp(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_rx_iscsi_cmp *rpl = (struct cpl_rx_iscsi_cmp *)skb->data;
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	struct sk_buff *data_skb = NULL;
+	u32 tid = GET_TID(rpl);
+	u32 ddpvld = be32_to_cpu(rpl->ddpvld);
+	u32 seq = be32_to_cpu(rpl->seq);
+	u16 pdu_len_ddp = be16_to_cpu(rpl->pdu_len_ddp);
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk)) {
+		pr_err("can't find connection for tid %u.\n", tid);
+		goto rel_skb;
+	}
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		  "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p, len %u, "
+		  "pdu_len_ddp %u, status %u.\n",
+		  csk, csk->state, csk->flags, skb, ddpvld, csk->skb_ulp_lhdr,
+		  ntohs(rpl->len), pdu_len_ddp,  rpl->status);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			  "csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			  csk, csk->state, csk->flags, csk->tid);
+
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	cxgbi_skcb_tcp_seq(skb) = seq;
+	cxgbi_skcb_flags(skb) = 0;
+	cxgbi_skcb_rx_pdulen(skb) = 0;
+
+	skb_reset_transport_header(skb);
+	__skb_pull(skb, sizeof(*rpl));
+	__pskb_trim(skb, be16_to_cpu(rpl->len));
+
+	csk->rcv_nxt = seq + pdu_len_ddp;
+
+	if (csk->skb_ulp_lhdr) {
+		data_skb = skb_peek(&csk->receive_queue);
+		if (!data_skb ||
+		    !cxgbi_skcb_test_flag(data_skb, SKCBF_RX_DATA)) {
+			pr_err("Error! freelist data not found 0x%p, tid %u\n",
+			       data_skb, tid);
+
+			goto abort_conn;
+		}
+		__skb_unlink(data_skb, &csk->receive_queue);
+
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA);
+
+		__skb_queue_tail(&csk->receive_queue, skb);
+		__skb_queue_tail(&csk->receive_queue, data_skb);
+	} else {
+		 __skb_queue_tail(&csk->receive_queue, skb);
+	}
+
+	csk->skb_ulp_lhdr = NULL;
+
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_ISCSI_COMPL);
+	cxgbi_skcb_rx_ddigest(skb) = be32_to_cpu(rpl->ulp_crc);
+
+	cxgb4i_process_ddpvld(csk, skb, ddpvld);
+
+	log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, skb 0x%p, f 0x%lx.\n",
+		  csk, skb, cxgbi_skcb_flags(skb));
+
+	cxgbi_conn_pdu_ready(csk);
+	spin_unlock_bh(&csk->lock);
+
+	return;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+rel_skb:
+	__kfree_skb(skb);
+}
+
+static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk;
+	struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+
+	csk = lookup_tid(t, tid);
+	if (unlikely(!csk))
+		pr_err("can't find connection for tid %u.\n", tid);
+	else {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
+					rpl->seq_vld);
+	}
+	__kfree_skb(skb);
+}
+
+static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
+{
+	struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
+	unsigned int tid = GET_TID(rpl);
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct tid_info *t = lldi->tids;
+	struct cxgbi_sock *csk;
+
+	csk = lookup_tid(t, tid);
+	if (!csk) {
+		pr_err("can't find conn. for tid %u.\n", tid);
+		return;
+	}
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,%lx,%u, status 0x%x.\n",
+		csk, csk->state, csk->flags, csk->tid, rpl->status);
+
+	if (rpl->status != CPL_ERR_NONE) {
+		pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
+			csk, tid, rpl->status);
+		csk->err = -EINVAL;
+	}
+
+	complete(&csk->cmpl);
+
+	__kfree_skb(skb);
+}
+
+static int alloc_cpls(struct cxgbi_sock *csk)
+{
+	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
+					0, GFP_KERNEL);
+	if (!csk->cpl_close)
+		return -ENOMEM;
+
+	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
+					0, GFP_KERNEL);
+	if (!csk->cpl_abort_req)
+		goto free_cpls;
+
+	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
+					0, GFP_KERNEL);
+	if (!csk->cpl_abort_rpl)
+		goto free_cpls;
+	return 0;
+
+free_cpls:
+	cxgbi_sock_free_cpl_skbs(csk);
+	return -ENOMEM;
+}
+
+static inline void l2t_put(struct cxgbi_sock *csk)
+{
+	if (csk->l2t) {
+		cxgb4_l2t_release(csk->l2t);
+		csk->l2t = NULL;
+		cxgbi_sock_put(csk);
+	}
+}
+
+static void release_offload_resources(struct cxgbi_sock *csk)
+{
+	struct cxgb4_lld_info *lldi;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct net_device *ndev = csk->cdev->ports[csk->port_id];
+#endif
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_free_cpl_skbs(csk);
+	cxgbi_sock_purge_write_queue(csk);
+	if (csk->wr_cred != csk->wr_max_cred) {
+		cxgbi_sock_purge_wr_queue(csk);
+		cxgbi_sock_reset_wr_list(csk);
+	}
+
+	l2t_put(csk);
+#if IS_ENABLED(CONFIG_IPV6)
+	if (csk->csk_family == AF_INET6)
+		cxgb4_clip_release(ndev,
+				   (const u32 *)&csk->saddr6.sin6_addr, 1);
+#endif
+
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
+		free_atid(csk);
+	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
+		lldi = cxgbi_cdev_priv(csk->cdev);
+		cxgb4_remove_tid(lldi->tids, 0, csk->tid,
+				 csk->csk_family);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
+		cxgbi_sock_put(csk);
+	}
+	csk->dst = NULL;
+}
+
+static int init_act_open(struct cxgbi_sock *csk)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct net_device *ndev = cdev->ports[csk->port_id];
+	struct sk_buff *skb = NULL;
+	struct neighbour *n = NULL;
+	void *daddr;
+	unsigned int step;
+	unsigned int rxq_idx;
+	unsigned int size, size6;
+	unsigned int linkspeed;
+	unsigned int rcv_winf, snd_winf;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	if (csk->csk_family == AF_INET)
+		daddr = &csk->daddr.sin_addr.s_addr;
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (csk->csk_family == AF_INET6)
+		daddr = &csk->daddr6.sin6_addr;
+#endif
+	else {
+		pr_err("address family 0x%x not supported\n", csk->csk_family);
+		goto rel_resource;
+	}
+
+	n = dst_neigh_lookup(csk->dst, daddr);
+
+	if (!n) {
+		pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
+		goto rel_resource;
+	}
+
+	if (!(n->nud_state & NUD_VALID))
+		neigh_event_send(n, NULL);
+
+	csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
+	if (csk->atid < 0) {
+		pr_err("%s, NO atid available.\n", ndev->name);
+		goto rel_resource_without_clip;
+	}
+	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
+	cxgbi_sock_get(csk);
+
+	csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
+	if (!csk->l2t) {
+		pr_err("%s, cannot alloc l2t.\n", ndev->name);
+		goto rel_resource_without_clip;
+	}
+	cxgbi_sock_get(csk);
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (csk->csk_family == AF_INET6)
+		cxgb4_clip_get(ndev, (const u32 *)&csk->saddr6.sin6_addr, 1);
+#endif
+
+	if (is_t4(lldi->adapter_type)) {
+		size = sizeof(struct cpl_act_open_req);
+		size6 = sizeof(struct cpl_act_open_req6);
+	} else if (is_t5(lldi->adapter_type)) {
+		size = sizeof(struct cpl_t5_act_open_req);
+		size6 = sizeof(struct cpl_t5_act_open_req6);
+	} else {
+		size = sizeof(struct cpl_t6_act_open_req);
+		size6 = sizeof(struct cpl_t6_act_open_req6);
+	}
+
+	if (csk->csk_family == AF_INET)
+		skb = alloc_wr(size, 0, GFP_NOIO);
+#if IS_ENABLED(CONFIG_IPV6)
+	else
+		skb = alloc_wr(size6, 0, GFP_NOIO);
+#endif
+
+	if (!skb)
+		goto rel_resource;
+	skb->sk = (struct sock *)csk;
+	t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
+
+	if (!csk->mtu)
+		csk->mtu = dst_mtu(csk->dst);
+	cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
+	csk->tx_chan = cxgb4_port_chan(ndev);
+	csk->smac_idx = cxgb4_tp_smt_idx(lldi->adapter_type,
+					 cxgb4_port_viid(ndev));
+	step = lldi->ntxq / lldi->nchan;
+	csk->txq_idx = cxgb4_port_idx(ndev) * step;
+	step = lldi->nrxq / lldi->nchan;
+	rxq_idx = (cxgb4_port_idx(ndev) * step) + (cdev->rxq_idx_cntr % step);
+	cdev->rxq_idx_cntr++;
+	csk->rss_qid = lldi->rxq_ids[rxq_idx];
+	linkspeed = ((struct port_info *)netdev_priv(ndev))->link_cfg.speed;
+	csk->snd_win = cxgb4i_snd_win;
+	csk->rcv_win = cxgb4i_rcv_win;
+	if (cxgb4i_rcv_win <= 0) {
+		csk->rcv_win = CXGB4I_DEFAULT_10G_RCV_WIN;
+		rcv_winf = linkspeed / SPEED_10000;
+		if (rcv_winf)
+			csk->rcv_win *= rcv_winf;
+	}
+	if (cxgb4i_snd_win <= 0) {
+		csk->snd_win = CXGB4I_DEFAULT_10G_SND_WIN;
+		snd_winf = linkspeed / SPEED_10000;
+		if (snd_winf)
+			csk->snd_win *= snd_winf;
+	}
+	csk->wr_cred = lldi->wr_cred -
+		       DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
+	csk->wr_max_cred = csk->wr_cred;
+	csk->wr_una_cred = 0;
+	cxgbi_sock_reset_wr_list(csk);
+	csk->err = 0;
+
+	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
+		       (&csk->saddr), (&csk->daddr), csk, csk->state,
+		       csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
+		       csk->mtu, csk->mss_idx, csk->smac_idx);
+
+	/* must wait for either a act_open_rpl or act_open_establish */
+	if (!try_module_get(cdev->owner)) {
+		pr_err("%s, try_module_get failed.\n", ndev->name);
+		goto rel_resource;
+	}
+
+	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
+	if (csk->csk_family == AF_INET)
+		send_act_open_req(csk, skb, csk->l2t);
+#if IS_ENABLED(CONFIG_IPV6)
+	else
+		send_act_open_req6(csk, skb, csk->l2t);
+#endif
+	neigh_release(n);
+
+	return 0;
+
+rel_resource:
+#if IS_ENABLED(CONFIG_IPV6)
+	if (csk->csk_family == AF_INET6)
+		cxgb4_clip_release(ndev,
+				   (const u32 *)&csk->saddr6.sin6_addr, 1);
+#endif
+rel_resource_without_clip:
+	if (n)
+		neigh_release(n);
+	if (skb)
+		__kfree_skb(skb);
+	return -EINVAL;
+}
+
+static cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
+	[CPL_ACT_ESTABLISH] = do_act_establish,
+	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
+	[CPL_PEER_CLOSE] = do_peer_close,
+	[CPL_ABORT_REQ_RSS] = do_abort_req_rss,
+	[CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
+	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
+	[CPL_FW4_ACK] = do_fw4_ack,
+	[CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
+	[CPL_ISCSI_DATA] = do_rx_iscsi_data,
+	[CPL_SET_TCB_RPL] = do_set_tcb_rpl,
+	[CPL_RX_DATA_DDP] = do_rx_data_ddp,
+	[CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
+	[CPL_RX_ISCSI_CMP] = do_rx_iscsi_cmp,
+	[CPL_RX_DATA] = do_rx_data,
+};
+
+static int cxgb4i_ofld_init(struct cxgbi_device *cdev)
+{
+	int rc;
+
+	if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
+		cxgb4i_max_connect = CXGB4I_MAX_CONN;
+
+	rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
+					cxgb4i_max_connect);
+	if (rc < 0)
+		return rc;
+
+	cdev->csk_release_offload_resources = release_offload_resources;
+	cdev->csk_push_tx_frames = push_tx_frames;
+	cdev->csk_send_abort_req = send_abort_req;
+	cdev->csk_send_close_req = send_close_req;
+	cdev->csk_send_rx_credits = send_rx_credits;
+	cdev->csk_alloc_cpls = alloc_cpls;
+	cdev->csk_init_act_open = init_act_open;
+
+	pr_info("cdev 0x%p, offload up, added.\n", cdev);
+	return 0;
+}
+
+static inline void
+ulp_mem_io_set_hdr(struct cxgbi_device *cdev,
+		   struct ulp_mem_io *req,
+		   unsigned int wr_len, unsigned int dlen,
+		   unsigned int pm_addr,
+		   int tid)
+{
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
+
+	INIT_ULPTX_WR(req, wr_len, 0, tid);
+	req->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) |
+		FW_WR_ATOMIC_V(0));
+	req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
+		ULP_MEMIO_ORDER_V(is_t4(lldi->adapter_type)) |
+		T5_ULP_MEMIO_IMM_V(!is_t4(lldi->adapter_type)));
+	req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
+	req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
+	req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
+
+	idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
+	idata->len = htonl(dlen);
+}
+
+static struct sk_buff *
+ddp_ppod_init_idata(struct cxgbi_device *cdev,
+		    struct cxgbi_ppm *ppm,
+		    unsigned int idx, unsigned int npods,
+		    unsigned int tid)
+{
+	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
+	unsigned int dlen = npods << PPOD_SIZE_SHIFT;
+	unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
+				sizeof(struct ulptx_idata) + dlen, 16);
+	struct sk_buff *skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
+
+	if (!skb) {
+		pr_err("%s: %s idx %u, npods %u, OOM.\n",
+		       __func__, ppm->ndev->name, idx, npods);
+		return NULL;
+	}
+
+	ulp_mem_io_set_hdr(cdev, (struct ulp_mem_io *)skb->head, wr_len, dlen,
+			   pm_addr, tid);
+
+	return skb;
+}
+
+static int ddp_ppod_write_idata(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
+				struct cxgbi_task_tag_info *ttinfo,
+				unsigned int idx, unsigned int npods,
+				struct scatterlist **sg_pp,
+				unsigned int *sg_off)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct sk_buff *skb = ddp_ppod_init_idata(cdev, ppm, idx, npods,
+						  csk->tid);
+	struct ulp_mem_io *req;
+	struct ulptx_idata *idata;
+	struct cxgbi_pagepod *ppod;
+	int i;
+
+	if (!skb)
+		return -ENOMEM;
+
+	req = (struct ulp_mem_io *)skb->head;
+	idata = (struct ulptx_idata *)(req + 1);
+	ppod = (struct cxgbi_pagepod *)(idata + 1);
+
+	for (i = 0; i < npods; i++, ppod++)
+		cxgbi_ddp_set_one_ppod(ppod, ttinfo, sg_pp, sg_off);
+
+	cxgbi_skcb_set_flag(skb, SKCBF_TX_MEM_WRITE);
+	cxgbi_skcb_set_flag(skb, SKCBF_TX_FLAG_COMPL);
+	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
+
+	spin_lock_bh(&csk->lock);
+	cxgbi_sock_skb_entail(csk, skb);
+	spin_unlock_bh(&csk->lock);
+
+	return 0;
+}
+
+static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
+		       struct cxgbi_task_tag_info *ttinfo)
+{
+	unsigned int pidx = ttinfo->idx;
+	unsigned int npods = ttinfo->npods;
+	unsigned int i, cnt;
+	int err = 0;
+	struct scatterlist *sg = ttinfo->sgl;
+	unsigned int offset = 0;
+
+	ttinfo->cid = csk->port_id;
+
+	for (i = 0; i < npods; i += cnt, pidx += cnt) {
+		cnt = npods - i;
+
+		if (cnt > ULPMEM_IDATA_MAX_NPPODS)
+			cnt = ULPMEM_IDATA_MAX_NPPODS;
+		err = ddp_ppod_write_idata(ppm, csk, ttinfo, pidx, cnt,
+					   &sg, &offset);
+		if (err < 0)
+			break;
+	}
+
+	return err;
+}
+
+static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
+				int pg_idx)
+{
+	struct sk_buff *skb;
+	struct cpl_set_tcb_field *req;
+
+	if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
+		return 0;
+
+	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	/*  set up ulp page size */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	INIT_TP_WR(req, csk->tid);
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
+	req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
+	req->word_cookie = htons(0);
+	req->mask = cpu_to_be64(0x3 << 8);
+	req->val = cpu_to_be64(pg_idx << 8);
+	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
+
+	reinit_completion(&csk->cmpl);
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+	wait_for_completion(&csk->cmpl);
+
+	return csk->err;
+}
+
+static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
+				 int hcrc, int dcrc)
+{
+	struct sk_buff *skb;
+	struct cpl_set_tcb_field *req;
+
+	if (!hcrc && !dcrc)
+		return 0;
+
+	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	csk->hcrc_len = (hcrc ? 4 : 0);
+	csk->dcrc_len = (dcrc ? 4 : 0);
+	/*  set up ulp submode */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	INIT_TP_WR(req, tid);
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+	req->reply_ctrl = htons(NO_REPLY_V(0) | QUEUENO_V(csk->rss_qid));
+	req->word_cookie = htons(0);
+	req->mask = cpu_to_be64(0x3 << 4);
+	req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
+				(dcrc ? ULP_CRC_DATA : 0)) << 4);
+	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
+
+	reinit_completion(&csk->cmpl);
+	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
+	wait_for_completion(&csk->cmpl);
+
+	return csk->err;
+}
+
+static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
+{
+	return (struct cxgbi_ppm *)(*((struct cxgb4_lld_info *)
+				       (cxgbi_cdev_priv(cdev)))->iscsi_ppm);
+}
+
+static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
+{
+	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
+	struct net_device *ndev = cdev->ports[0];
+	struct cxgbi_tag_format tformat;
+	unsigned int ppmax;
+	int i;
+
+	if (!lldi->vr->iscsi.size) {
+		pr_warn("%s, iscsi NOT enabled, check config!\n", ndev->name);
+		return -EACCES;
+	}
+
+	cdev->flags |= CXGBI_FLAG_USE_PPOD_OFLDQ;
+	ppmax = lldi->vr->iscsi.size >> PPOD_SIZE_SHIFT;
+
+	memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
+	for (i = 0; i < 4; i++)
+		tformat.pgsz_order[i] = (lldi->iscsi_pgsz_order >> (i << 3))
+					 & 0xF;
+	cxgbi_tagmask_check(lldi->iscsi_tagmask, &tformat);
+
+	cxgbi_ddp_ppm_setup(lldi->iscsi_ppm, cdev, &tformat, ppmax,
+			    lldi->iscsi_llimit, lldi->vr->iscsi.start, 2);
+
+	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
+	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
+	cdev->csk_ddp_set_map = ddp_set_map;
+	cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
+	cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
+	cdev->cdev2ppm = cdev2ppm;
+
+	return 0;
+}
+
+static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
+{
+	struct cxgbi_device *cdev;
+	struct port_info *pi;
+	int i, rc;
+
+	cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
+	if (!cdev) {
+		pr_info("t4 device 0x%p, register failed.\n", lldi);
+		return NULL;
+	}
+	pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
+		cdev, lldi->adapter_type, lldi->nports,
+		lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
+		lldi->nrxq, lldi->wr_cred);
+	for (i = 0; i < lldi->nrxq; i++)
+		log_debug(1 << CXGBI_DBG_DEV,
+			"t4 0x%p, rxq id #%d: %u.\n",
+			cdev, i, lldi->rxq_ids[i]);
+
+	memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
+	cdev->flags = CXGBI_FLAG_DEV_T4;
+	cdev->pdev = lldi->pdev;
+	cdev->ports = lldi->ports;
+	cdev->nports = lldi->nports;
+	cdev->mtus = lldi->mtus;
+	cdev->nmtus = NMTUS;
+	cdev->rx_credit_thres = (CHELSIO_CHIP_VERSION(lldi->adapter_type) <=
+				 CHELSIO_T5) ? cxgb4i_rx_credit_thres : 0;
+	cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
+	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
+	cdev->itp = &cxgb4i_iscsi_transport;
+	cdev->owner = THIS_MODULE;
+
+	cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
+			<< FW_VIID_PFN_S;
+	pr_info("cdev 0x%p,%s, pfvf %u.\n",
+		cdev, lldi->ports[0]->name, cdev->pfvf);
+
+	rc = cxgb4i_ddp_init(cdev);
+	if (rc) {
+		pr_info("t4 0x%p ddp init failed.\n", cdev);
+		goto err_out;
+	}
+	rc = cxgb4i_ofld_init(cdev);
+	if (rc) {
+		pr_info("t4 0x%p ofld init failed.\n", cdev);
+		goto err_out;
+	}
+
+	rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
+				&cxgb4i_host_template, cxgb4i_stt);
+	if (rc)
+		goto err_out;
+
+	for (i = 0; i < cdev->nports; i++) {
+		pi = netdev_priv(lldi->ports[i]);
+		cdev->hbas[i]->port_id = pi->port_id;
+	}
+	return cdev;
+
+err_out:
+	cxgbi_device_unregister(cdev);
+	return ERR_PTR(-ENOMEM);
+}
+
+#define RX_PULL_LEN	128
+static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
+				const struct pkt_gl *pgl)
+{
+	const struct cpl_act_establish *rpl;
+	struct sk_buff *skb;
+	unsigned int opc;
+	struct cxgbi_device *cdev = handle;
+
+	if (pgl == NULL) {
+		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
+
+		skb = alloc_wr(len, 0, GFP_ATOMIC);
+		if (!skb)
+			goto nomem;
+		skb_copy_to_linear_data(skb, &rsp[1], len);
+	} else {
+		if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
+			pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
+				pgl->va, be64_to_cpu(*rsp),
+				be64_to_cpu(*(u64 *)pgl->va),
+				pgl->tot_len);
+			return 0;
+		}
+		skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
+		if (unlikely(!skb))
+			goto nomem;
+	}
+
+	rpl = (struct cpl_act_establish *)skb->data;
+	opc = rpl->ot.opcode;
+	log_debug(1 << CXGBI_DBG_TOE,
+		"cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
+		 cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
+	if (opc >= ARRAY_SIZE(cxgb4i_cplhandlers) || !cxgb4i_cplhandlers[opc]) {
+		pr_err("No handler for opcode 0x%x.\n", opc);
+		__kfree_skb(skb);
+	} else
+		cxgb4i_cplhandlers[opc](cdev, skb);
+
+	return 0;
+nomem:
+	log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
+	return 1;
+}
+
+static int t4_uld_state_change(void *handle, enum cxgb4_state state)
+{
+	struct cxgbi_device *cdev = handle;
+
+	switch (state) {
+	case CXGB4_STATE_UP:
+		pr_info("cdev 0x%p, UP.\n", cdev);
+		break;
+	case CXGB4_STATE_START_RECOVERY:
+		pr_info("cdev 0x%p, RECOVERY.\n", cdev);
+		/* close all connections */
+		break;
+	case CXGB4_STATE_DOWN:
+		pr_info("cdev 0x%p, DOWN.\n", cdev);
+		break;
+	case CXGB4_STATE_DETACH:
+		pr_info("cdev 0x%p, DETACH.\n", cdev);
+		cxgbi_device_unregister(cdev);
+		break;
+	default:
+		pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
+		break;
+	}
+	return 0;
+}
+
+static int __init cxgb4i_init_module(void)
+{
+	int rc;
+
+	printk(KERN_INFO "%s", version);
+
+	rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
+	if (rc < 0)
+		return rc;
+	cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
+
+	return 0;
+}
+
+static void __exit cxgb4i_exit_module(void)
+{
+	cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
+	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
+	cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
+}
+
+module_init(cxgb4i_init_module);
+module_exit(cxgb4i_exit_module);
diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.h b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.h
new file mode 100644
index 000000000..2fd9c76fc
--- /dev/null
+++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.h
@@ -0,0 +1,28 @@
+/*
+ * cxgb4i.h: Chelsio T4 iSCSI driver.
+ *
+ * Copyright (c) 2010-2015 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ * Written by: Rakesh Ranjan (rranjan@chelsio.com)
+ */
+
+#ifndef	__CXGB4I_H__
+#define	__CXGB4I_H__
+
+#define	CXGB4I_SCSI_HOST_QDEPTH	1024
+#define	CXGB4I_MAX_CONN		16384
+#define	CXGB4I_MAX_TARGET	CXGB4I_MAX_CONN
+#define	CXGB4I_MAX_LUN		0x1000
+
+/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
+#define CXGB4I_TX_HEADER_LEN \
+	(sizeof(struct fw_ofld_tx_data_wr) + sizeof(struct sge_opaque_hdr))
+
+#define T5_ISS_VALID		(1 << 18)
+
+#endif	/* __CXGB4I_H__ */
diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
new file mode 100644
index 000000000..01f5ebee3
--- /dev/null
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -0,0 +1,2789 @@
+/*
+ * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
+ *
+ * Copyright (c) 2010-2015 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ * Written by: Rakesh Ranjan (rranjan@chelsio.com)
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/skbuff.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+#include <linux/pci.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <linux/if_vlan.h>
+#include <linux/inet.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+
+#include <linux/inetdevice.h>	/* ip_dev_find */
+#include <linux/module.h>
+#include <net/tcp.h>
+
+static unsigned int dbg_level;
+
+#include "libcxgbi.h"
+
+#define DRV_MODULE_NAME		"libcxgbi"
+#define DRV_MODULE_DESC		"Chelsio iSCSI driver library"
+#define DRV_MODULE_VERSION	"0.9.1-ko"
+#define DRV_MODULE_RELDATE	"Apr. 2015"
+
+static char version[] =
+	DRV_MODULE_DESC " " DRV_MODULE_NAME
+	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Chelsio Communications, Inc.");
+MODULE_DESCRIPTION(DRV_MODULE_DESC);
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(dbg_level, uint, 0644);
+MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
+
+
+/*
+ * cxgbi device management
+ * maintains a list of the cxgbi devices
+ */
+static LIST_HEAD(cdev_list);
+static DEFINE_MUTEX(cdev_mutex);
+
+static LIST_HEAD(cdev_rcu_list);
+static DEFINE_SPINLOCK(cdev_rcu_lock);
+
+static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
+{
+	if (age)
+		*age = sw_tag & 0x7FFF;
+	if (idx)
+		*idx = (sw_tag >> 16) & 0x7FFF;
+}
+
+int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
+				unsigned int max_conn)
+{
+	struct cxgbi_ports_map *pmap = &cdev->pmap;
+
+	pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
+					     sizeof(struct cxgbi_sock *),
+					     GFP_KERNEL);
+	if (!pmap->port_csk) {
+		pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
+		return -ENOMEM;
+	}
+
+	pmap->max_connect = max_conn;
+	pmap->sport_base = base;
+	spin_lock_init(&pmap->lock);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
+
+void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
+{
+	struct cxgbi_ports_map *pmap = &cdev->pmap;
+	struct cxgbi_sock *csk;
+	int i;
+
+	for (i = 0; i < pmap->max_connect; i++) {
+		if (pmap->port_csk[i]) {
+			csk = pmap->port_csk[i];
+			pmap->port_csk[i] = NULL;
+			log_debug(1 << CXGBI_DBG_SOCK,
+				"csk 0x%p, cdev 0x%p, offload down.\n",
+				csk, cdev);
+			spin_lock_bh(&csk->lock);
+			cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
+			cxgbi_sock_closed(csk);
+			spin_unlock_bh(&csk->lock);
+			cxgbi_sock_put(csk);
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
+
+static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
+{
+	log_debug(1 << CXGBI_DBG_DEV,
+		"cdev 0x%p, p# %u.\n", cdev, cdev->nports);
+	cxgbi_hbas_remove(cdev);
+	cxgbi_device_portmap_cleanup(cdev);
+	if (cdev->cdev2ppm)
+		cxgbi_ppm_release(cdev->cdev2ppm(cdev));
+	if (cdev->pmap.max_connect)
+		cxgbi_free_big_mem(cdev->pmap.port_csk);
+	kfree(cdev);
+}
+
+struct cxgbi_device *cxgbi_device_register(unsigned int extra,
+					   unsigned int nports)
+{
+	struct cxgbi_device *cdev;
+
+	cdev = kzalloc(sizeof(*cdev) + extra + nports *
+			(sizeof(struct cxgbi_hba *) +
+			 sizeof(struct net_device *)),
+			GFP_KERNEL);
+	if (!cdev) {
+		pr_warn("nport %d, OOM.\n", nports);
+		return NULL;
+	}
+	cdev->ports = (struct net_device **)(cdev + 1);
+	cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
+						sizeof(struct net_device *));
+	if (extra)
+		cdev->dd_data = ((char *)cdev->hbas) +
+				nports * sizeof(struct cxgbi_hba *);
+	spin_lock_init(&cdev->pmap.lock);
+
+	mutex_lock(&cdev_mutex);
+	list_add_tail(&cdev->list_head, &cdev_list);
+	mutex_unlock(&cdev_mutex);
+
+	spin_lock(&cdev_rcu_lock);
+	list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
+	spin_unlock(&cdev_rcu_lock);
+
+	log_debug(1 << CXGBI_DBG_DEV,
+		"cdev 0x%p, p# %u.\n", cdev, nports);
+	return cdev;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_register);
+
+void cxgbi_device_unregister(struct cxgbi_device *cdev)
+{
+	log_debug(1 << CXGBI_DBG_DEV,
+		"cdev 0x%p, p# %u,%s.\n",
+		cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
+
+	mutex_lock(&cdev_mutex);
+	list_del(&cdev->list_head);
+	mutex_unlock(&cdev_mutex);
+
+	spin_lock(&cdev_rcu_lock);
+	list_del_rcu(&cdev->rcu_node);
+	spin_unlock(&cdev_rcu_lock);
+	synchronize_rcu();
+
+	cxgbi_device_destroy(cdev);
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
+
+void cxgbi_device_unregister_all(unsigned int flag)
+{
+	struct cxgbi_device *cdev, *tmp;
+
+	mutex_lock(&cdev_mutex);
+	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
+		if ((cdev->flags & flag) == flag) {
+			mutex_unlock(&cdev_mutex);
+			cxgbi_device_unregister(cdev);
+			mutex_lock(&cdev_mutex);
+		}
+	}
+	mutex_unlock(&cdev_mutex);
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
+
+struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
+{
+	struct cxgbi_device *cdev, *tmp;
+
+	mutex_lock(&cdev_mutex);
+	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
+		if (cdev->lldev == lldev) {
+			mutex_unlock(&cdev_mutex);
+			return cdev;
+		}
+	}
+	mutex_unlock(&cdev_mutex);
+
+	log_debug(1 << CXGBI_DBG_DEV,
+		"lldev 0x%p, NO match found.\n", lldev);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
+
+struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
+						 int *port)
+{
+	struct net_device *vdev = NULL;
+	struct cxgbi_device *cdev, *tmp;
+	int i;
+
+	if (is_vlan_dev(ndev)) {
+		vdev = ndev;
+		ndev = vlan_dev_real_dev(ndev);
+		log_debug(1 << CXGBI_DBG_DEV,
+			"vlan dev %s -> %s.\n", vdev->name, ndev->name);
+	}
+
+	mutex_lock(&cdev_mutex);
+	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
+		for (i = 0; i < cdev->nports; i++) {
+			if (ndev == cdev->ports[i]) {
+				cdev->hbas[i]->vdev = vdev;
+				mutex_unlock(&cdev_mutex);
+				if (port)
+					*port = i;
+				return cdev;
+			}
+		}
+	}
+	mutex_unlock(&cdev_mutex);
+	log_debug(1 << CXGBI_DBG_DEV,
+		"ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
+
+struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
+						     int *port)
+{
+	struct net_device *vdev = NULL;
+	struct cxgbi_device *cdev;
+	int i;
+
+	if (is_vlan_dev(ndev)) {
+		vdev = ndev;
+		ndev = vlan_dev_real_dev(ndev);
+		pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
+		for (i = 0; i < cdev->nports; i++) {
+			if (ndev == cdev->ports[i]) {
+				cdev->hbas[i]->vdev = vdev;
+				rcu_read_unlock();
+				if (port)
+					*port = i;
+				return cdev;
+			}
+		}
+	}
+	rcu_read_unlock();
+
+	log_debug(1 << CXGBI_DBG_DEV,
+		  "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
+						     int *port)
+{
+	struct net_device *vdev = NULL;
+	struct cxgbi_device *cdev, *tmp;
+	int i;
+
+	if (is_vlan_dev(ndev)) {
+		vdev = ndev;
+		ndev = vlan_dev_real_dev(ndev);
+		pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
+	}
+
+	mutex_lock(&cdev_mutex);
+	list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
+		for (i = 0; i < cdev->nports; i++) {
+			if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
+				    MAX_ADDR_LEN)) {
+				cdev->hbas[i]->vdev = vdev;
+				mutex_unlock(&cdev_mutex);
+				if (port)
+					*port = i;
+				return cdev;
+			}
+		}
+	}
+	mutex_unlock(&cdev_mutex);
+	log_debug(1 << CXGBI_DBG_DEV,
+		  "ndev 0x%p, %s, NO match mac found.\n",
+		  ndev, ndev->name);
+	return NULL;
+}
+#endif
+
+void cxgbi_hbas_remove(struct cxgbi_device *cdev)
+{
+	int i;
+	struct cxgbi_hba *chba;
+
+	log_debug(1 << CXGBI_DBG_DEV,
+		"cdev 0x%p, p#%u.\n", cdev, cdev->nports);
+
+	for (i = 0; i < cdev->nports; i++) {
+		chba = cdev->hbas[i];
+		if (chba) {
+			cdev->hbas[i] = NULL;
+			iscsi_host_remove(chba->shost);
+			pci_dev_put(cdev->pdev);
+			iscsi_host_free(chba->shost);
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
+
+int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
+		unsigned int max_conns, struct scsi_host_template *sht,
+		struct scsi_transport_template *stt)
+{
+	struct cxgbi_hba *chba;
+	struct Scsi_Host *shost;
+	int i, err;
+
+	log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
+
+	for (i = 0; i < cdev->nports; i++) {
+		shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
+		if (!shost) {
+			pr_info("0x%p, p%d, %s, host alloc failed.\n",
+				cdev, i, cdev->ports[i]->name);
+			err = -ENOMEM;
+			goto err_out;
+		}
+
+		shost->transportt = stt;
+		shost->max_lun = max_lun;
+		shost->max_id = max_conns - 1;
+		shost->max_channel = 0;
+		shost->max_cmd_len = 16;
+
+		chba = iscsi_host_priv(shost);
+		chba->cdev = cdev;
+		chba->ndev = cdev->ports[i];
+		chba->shost = shost;
+
+		log_debug(1 << CXGBI_DBG_DEV,
+			"cdev 0x%p, p#%d %s: chba 0x%p.\n",
+			cdev, i, cdev->ports[i]->name, chba);
+
+		pci_dev_get(cdev->pdev);
+		err = iscsi_host_add(shost, &cdev->pdev->dev);
+		if (err) {
+			pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
+				cdev, i, cdev->ports[i]->name);
+			pci_dev_put(cdev->pdev);
+			scsi_host_put(shost);
+			goto  err_out;
+		}
+
+		cdev->hbas[i] = chba;
+	}
+
+	return 0;
+
+err_out:
+	cxgbi_hbas_remove(cdev);
+	return err;
+}
+EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
+
+/*
+ * iSCSI offload
+ *
+ * - source port management
+ *   To find a free source port in the port allocation map we use a very simple
+ *   rotor scheme to look for the next free port.
+ *
+ *   If a source port has been specified make sure that it doesn't collide with
+ *   our normal source port allocation map.  If it's outside the range of our
+ *   allocation/deallocation scheme just let them use it.
+ *
+ *   If the source port is outside our allocation range, the caller is
+ *   responsible for keeping track of their port usage.
+ */
+
+static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
+					    unsigned char port_id)
+{
+	struct cxgbi_ports_map *pmap = &cdev->pmap;
+	unsigned int i;
+	unsigned int used;
+
+	if (!pmap->max_connect || !pmap->used)
+		return NULL;
+
+	spin_lock_bh(&pmap->lock);
+	used = pmap->used;
+	for (i = 0; used && i < pmap->max_connect; i++) {
+		struct cxgbi_sock *csk = pmap->port_csk[i];
+
+		if (csk) {
+			if (csk->port_id == port_id) {
+				spin_unlock_bh(&pmap->lock);
+				return csk;
+			}
+			used--;
+		}
+	}
+	spin_unlock_bh(&pmap->lock);
+
+	return NULL;
+}
+
+static int sock_get_port(struct cxgbi_sock *csk)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct cxgbi_ports_map *pmap = &cdev->pmap;
+	unsigned int start;
+	int idx;
+	__be16 *port;
+
+	if (!pmap->max_connect) {
+		pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
+			   cdev, csk->port_id, cdev->ports[csk->port_id]->name);
+		return -EADDRNOTAVAIL;
+	}
+
+	if (csk->csk_family == AF_INET)
+		port = &csk->saddr.sin_port;
+	else /* ipv6 */
+		port = &csk->saddr6.sin6_port;
+
+	if (*port) {
+		pr_err("source port NON-ZERO %u.\n",
+			ntohs(*port));
+		return -EADDRINUSE;
+	}
+
+	spin_lock_bh(&pmap->lock);
+	if (pmap->used >= pmap->max_connect) {
+		spin_unlock_bh(&pmap->lock);
+		pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
+			cdev, csk->port_id, cdev->ports[csk->port_id]->name);
+		return -EADDRNOTAVAIL;
+	}
+
+	start = idx = pmap->next;
+	do {
+		if (++idx >= pmap->max_connect)
+			idx = 0;
+		if (!pmap->port_csk[idx]) {
+			pmap->used++;
+			*port = htons(pmap->sport_base + idx);
+			pmap->next = idx;
+			pmap->port_csk[idx] = csk;
+			spin_unlock_bh(&pmap->lock);
+			cxgbi_sock_get(csk);
+			log_debug(1 << CXGBI_DBG_SOCK,
+				"cdev 0x%p, p#%u %s, p %u, %u.\n",
+				cdev, csk->port_id,
+				cdev->ports[csk->port_id]->name,
+				pmap->sport_base + idx, pmap->next);
+			return 0;
+		}
+	} while (idx != start);
+	spin_unlock_bh(&pmap->lock);
+
+	/* should not happen */
+	pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
+		cdev, csk->port_id, cdev->ports[csk->port_id]->name,
+		pmap->next);
+	return -EADDRNOTAVAIL;
+}
+
+static void sock_put_port(struct cxgbi_sock *csk)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct cxgbi_ports_map *pmap = &cdev->pmap;
+	__be16 *port;
+
+	if (csk->csk_family == AF_INET)
+		port = &csk->saddr.sin_port;
+	else /* ipv6 */
+		port = &csk->saddr6.sin6_port;
+
+	if (*port) {
+		int idx = ntohs(*port) - pmap->sport_base;
+
+		*port = 0;
+		if (idx < 0 || idx >= pmap->max_connect) {
+			pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
+				cdev, csk->port_id,
+				cdev->ports[csk->port_id]->name,
+				ntohs(*port));
+			return;
+		}
+
+		spin_lock_bh(&pmap->lock);
+		pmap->port_csk[idx] = NULL;
+		pmap->used--;
+		spin_unlock_bh(&pmap->lock);
+
+		log_debug(1 << CXGBI_DBG_SOCK,
+			"cdev 0x%p, p#%u %s, release %u.\n",
+			cdev, csk->port_id, cdev->ports[csk->port_id]->name,
+			pmap->sport_base + idx);
+
+		cxgbi_sock_put(csk);
+	}
+}
+
+/*
+ * iscsi tcp connection
+ */
+void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
+{
+	if (csk->cpl_close) {
+		kfree_skb(csk->cpl_close);
+		csk->cpl_close = NULL;
+	}
+	if (csk->cpl_abort_req) {
+		kfree_skb(csk->cpl_abort_req);
+		csk->cpl_abort_req = NULL;
+	}
+	if (csk->cpl_abort_rpl) {
+		kfree_skb(csk->cpl_abort_rpl);
+		csk->cpl_abort_rpl = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
+
+static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
+{
+	struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
+
+	if (!csk) {
+		pr_info("alloc csk %zu failed.\n", sizeof(*csk));
+		return NULL;
+	}
+
+	if (cdev->csk_alloc_cpls(csk) < 0) {
+		pr_info("csk 0x%p, alloc cpls failed.\n", csk);
+		kfree(csk);
+		return NULL;
+	}
+
+	spin_lock_init(&csk->lock);
+	kref_init(&csk->refcnt);
+	skb_queue_head_init(&csk->receive_queue);
+	skb_queue_head_init(&csk->write_queue);
+	timer_setup(&csk->retry_timer, NULL, 0);
+	init_completion(&csk->cmpl);
+	rwlock_init(&csk->callback_lock);
+	csk->cdev = cdev;
+	csk->flags = 0;
+	cxgbi_sock_set_state(csk, CTP_CLOSED);
+
+	log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
+
+	return csk;
+}
+
+static struct rtable *find_route_ipv4(struct flowi4 *fl4,
+				      __be32 saddr, __be32 daddr,
+				      __be16 sport, __be16 dport, u8 tos,
+				      int ifindex)
+{
+	struct rtable *rt;
+
+	rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
+				   dport, sport, IPPROTO_TCP, tos, ifindex);
+	if (IS_ERR(rt))
+		return NULL;
+
+	return rt;
+}
+
+static struct cxgbi_sock *
+cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
+{
+	struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
+	struct dst_entry *dst;
+	struct net_device *ndev;
+	struct cxgbi_device *cdev;
+	struct rtable *rt = NULL;
+	struct neighbour *n;
+	struct flowi4 fl4;
+	struct cxgbi_sock *csk = NULL;
+	unsigned int mtu = 0;
+	int port = 0xFFFF;
+	int err = 0;
+
+	rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
+			     daddr->sin_port, 0, ifindex);
+	if (!rt) {
+		pr_info("no route to ipv4 0x%x, port %u.\n",
+			be32_to_cpu(daddr->sin_addr.s_addr),
+			be16_to_cpu(daddr->sin_port));
+		err = -ENETUNREACH;
+		goto err_out;
+	}
+	dst = &rt->dst;
+	n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
+	if (!n) {
+		err = -ENODEV;
+		goto rel_rt;
+	}
+	ndev = n->dev;
+
+	if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
+		pr_info("multi-cast route %pI4, port %u, dev %s.\n",
+			&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
+			ndev->name);
+		err = -ENETUNREACH;
+		goto rel_neigh;
+	}
+
+	if (ndev->flags & IFF_LOOPBACK) {
+		ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
+		if (!ndev) {
+			err = -ENETUNREACH;
+			goto rel_neigh;
+		}
+		mtu = ndev->mtu;
+		pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
+			n->dev->name, ndev->name, mtu);
+	}
+
+	if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
+		pr_info("%s interface not up.\n", ndev->name);
+		err = -ENETDOWN;
+		goto rel_neigh;
+	}
+
+	cdev = cxgbi_device_find_by_netdev(ndev, &port);
+	if (!cdev) {
+		pr_info("dst %pI4, %s, NOT cxgbi device.\n",
+			&daddr->sin_addr.s_addr, ndev->name);
+		err = -ENETUNREACH;
+		goto rel_neigh;
+	}
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
+		&daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
+			   port, ndev->name, cdev);
+
+	csk = cxgbi_sock_create(cdev);
+	if (!csk) {
+		err = -ENOMEM;
+		goto rel_neigh;
+	}
+	csk->cdev = cdev;
+	csk->port_id = port;
+	csk->mtu = mtu;
+	csk->dst = dst;
+
+	csk->csk_family = AF_INET;
+	csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
+	csk->daddr.sin_port = daddr->sin_port;
+	csk->daddr.sin_family = daddr->sin_family;
+	csk->saddr.sin_family = daddr->sin_family;
+	csk->saddr.sin_addr.s_addr = fl4.saddr;
+	neigh_release(n);
+
+	return csk;
+
+rel_neigh:
+	neigh_release(n);
+
+rel_rt:
+	ip_rt_put(rt);
+err_out:
+	return ERR_PTR(err);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
+					const struct in6_addr *daddr,
+					int ifindex)
+{
+	struct flowi6 fl;
+
+	memset(&fl, 0, sizeof(fl));
+	fl.flowi6_oif = ifindex;
+	if (saddr)
+		memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
+	if (daddr)
+		memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
+	return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
+}
+
+static struct cxgbi_sock *
+cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
+{
+	struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
+	struct dst_entry *dst;
+	struct net_device *ndev;
+	struct cxgbi_device *cdev;
+	struct rt6_info *rt = NULL;
+	struct neighbour *n;
+	struct in6_addr pref_saddr;
+	struct cxgbi_sock *csk = NULL;
+	unsigned int mtu = 0;
+	int port = 0xFFFF;
+	int err = 0;
+
+	rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
+
+	if (!rt) {
+		pr_info("no route to ipv6 %pI6 port %u\n",
+			daddr6->sin6_addr.s6_addr,
+			be16_to_cpu(daddr6->sin6_port));
+		err = -ENETUNREACH;
+		goto err_out;
+	}
+
+	dst = &rt->dst;
+
+	n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
+
+	if (!n) {
+		pr_info("%pI6, port %u, dst no neighbour.\n",
+			daddr6->sin6_addr.s6_addr,
+			be16_to_cpu(daddr6->sin6_port));
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+	ndev = n->dev;
+
+	if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
+		pr_info("%s interface not up.\n", ndev->name);
+		err = -ENETDOWN;
+		goto rel_rt;
+	}
+
+	if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
+		pr_info("multi-cast route %pI6 port %u, dev %s.\n",
+			daddr6->sin6_addr.s6_addr,
+			ntohs(daddr6->sin6_port), ndev->name);
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+
+	cdev = cxgbi_device_find_by_netdev(ndev, &port);
+	if (!cdev)
+		cdev = cxgbi_device_find_by_mac(ndev, &port);
+	if (!cdev) {
+		pr_info("dst %pI6 %s, NOT cxgbi device.\n",
+			daddr6->sin6_addr.s6_addr, ndev->name);
+		err = -ENETUNREACH;
+		goto rel_rt;
+	}
+	log_debug(1 << CXGBI_DBG_SOCK,
+		  "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
+		  daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
+		  ndev->name, cdev);
+
+	csk = cxgbi_sock_create(cdev);
+	if (!csk) {
+		err = -ENOMEM;
+		goto rel_rt;
+	}
+	csk->cdev = cdev;
+	csk->port_id = port;
+	csk->mtu = mtu;
+	csk->dst = dst;
+
+	if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
+		struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
+
+		err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
+					 &daddr6->sin6_addr, 0, &pref_saddr);
+		if (err) {
+			pr_info("failed to get source address to reach %pI6\n",
+				&daddr6->sin6_addr);
+			goto rel_rt;
+		}
+	} else {
+		pref_saddr = rt->rt6i_prefsrc.addr;
+	}
+
+	csk->csk_family = AF_INET6;
+	csk->daddr6.sin6_addr = daddr6->sin6_addr;
+	csk->daddr6.sin6_port = daddr6->sin6_port;
+	csk->daddr6.sin6_family = daddr6->sin6_family;
+	csk->saddr6.sin6_family = daddr6->sin6_family;
+	csk->saddr6.sin6_addr = pref_saddr;
+
+	neigh_release(n);
+	return csk;
+
+rel_rt:
+	if (n)
+		neigh_release(n);
+
+	ip6_rt_put(rt);
+	if (csk)
+		cxgbi_sock_closed(csk);
+err_out:
+	return ERR_PTR(err);
+}
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
+void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
+			unsigned int opt)
+{
+	csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
+	dst_confirm(csk->dst);
+	smp_mb();
+	cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_established);
+
+static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
+		csk, csk->state, csk->flags, csk->user_data);
+
+	if (csk->state != CTP_ESTABLISHED) {
+		read_lock_bh(&csk->callback_lock);
+		if (csk->user_data)
+			iscsi_conn_failure(csk->user_data,
+					ISCSI_ERR_TCP_CONN_CLOSE);
+		read_unlock_bh(&csk->callback_lock);
+	}
+}
+
+void cxgbi_sock_closed(struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
+		csk, (csk)->state, (csk)->flags, (csk)->tid);
+	cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
+	if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
+		return;
+	if (csk->saddr.sin_port)
+		sock_put_port(csk);
+	if (csk->dst)
+		dst_release(csk->dst);
+	csk->cdev->csk_release_offload_resources(csk);
+	cxgbi_sock_set_state(csk, CTP_CLOSED);
+	cxgbi_inform_iscsi_conn_closing(csk);
+	cxgbi_sock_put(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
+
+static void need_active_close(struct cxgbi_sock *csk)
+{
+	int data_lost;
+	int close_req = 0;
+
+	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
+		csk, (csk)->state, (csk)->flags, (csk)->tid);
+	spin_lock_bh(&csk->lock);
+	if (csk->dst)
+		dst_confirm(csk->dst);
+	data_lost = skb_queue_len(&csk->receive_queue);
+	__skb_queue_purge(&csk->receive_queue);
+
+	if (csk->state == CTP_ACTIVE_OPEN)
+		cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
+	else if (csk->state == CTP_ESTABLISHED) {
+		close_req = 1;
+		cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
+	} else if (csk->state == CTP_PASSIVE_CLOSE) {
+		close_req = 1;
+		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
+	}
+
+	if (close_req) {
+		if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
+		    data_lost)
+			csk->cdev->csk_send_abort_req(csk);
+		else
+			csk->cdev->csk_send_close_req(csk);
+	}
+
+	spin_unlock_bh(&csk->lock);
+}
+
+void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
+{
+	pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
+			csk, csk->state, csk->flags,
+			&csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
+			&csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
+			errno);
+
+	cxgbi_sock_set_state(csk, CTP_CONNECTING);
+	csk->err = errno;
+	cxgbi_sock_closed(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
+
+void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
+{
+	struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
+	struct module *owner = csk->cdev->owner;
+
+	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
+		csk, (csk)->state, (csk)->flags, (csk)->tid);
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+	if (csk->state == CTP_ACTIVE_OPEN)
+		cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+	__kfree_skb(skb);
+
+	module_put(owner);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
+
+void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
+{
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
+	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
+		cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
+		if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
+			pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
+			       csk, csk->state, csk->flags, csk->tid);
+		cxgbi_sock_closed(csk);
+	}
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
+
+void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
+		csk, (csk)->state, (csk)->flags, (csk)->tid);
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
+		goto done;
+
+	switch (csk->state) {
+	case CTP_ESTABLISHED:
+		cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
+		break;
+	case CTP_ACTIVE_CLOSE:
+		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
+		break;
+	case CTP_CLOSE_WAIT_1:
+		cxgbi_sock_closed(csk);
+		break;
+	case CTP_ABORTING:
+		break;
+	default:
+		pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+	}
+	cxgbi_inform_iscsi_conn_closing(csk);
+done:
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
+
+void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
+{
+	log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
+		csk, (csk)->state, (csk)->flags, (csk)->tid);
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	csk->snd_una = snd_nxt - 1;
+	if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
+		goto done;
+
+	switch (csk->state) {
+	case CTP_ACTIVE_CLOSE:
+		cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
+		break;
+	case CTP_CLOSE_WAIT_1:
+	case CTP_CLOSE_WAIT_2:
+		cxgbi_sock_closed(csk);
+		break;
+	case CTP_ABORTING:
+		break;
+	default:
+		pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+	}
+done:
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
+
+void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
+			   unsigned int snd_una, int seq_chk)
+{
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
+			csk, csk->state, csk->flags, csk->tid, credits,
+			csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
+
+	spin_lock_bh(&csk->lock);
+
+	csk->wr_cred += credits;
+	if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
+		csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
+
+	while (credits) {
+		struct sk_buff *p = cxgbi_sock_peek_wr(csk);
+
+		if (unlikely(!p)) {
+			pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
+				csk, csk->state, csk->flags, csk->tid, credits,
+				csk->wr_cred, csk->wr_una_cred);
+			break;
+		}
+
+		if (unlikely(credits < p->csum)) {
+			pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
+				csk, csk->state, csk->flags, csk->tid,
+				credits, csk->wr_cred, csk->wr_una_cred,
+				p->csum);
+			p->csum -= credits;
+			break;
+		} else {
+			cxgbi_sock_dequeue_wr(csk);
+			credits -= p->csum;
+			kfree_skb(p);
+		}
+	}
+
+	cxgbi_sock_check_wr_invariants(csk);
+
+	if (seq_chk) {
+		if (unlikely(before(snd_una, csk->snd_una))) {
+			pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
+				csk, csk->state, csk->flags, csk->tid, snd_una,
+				csk->snd_una);
+			goto done;
+		}
+
+		if (csk->snd_una != snd_una) {
+			csk->snd_una = snd_una;
+			dst_confirm(csk->dst);
+		}
+	}
+
+	if (skb_queue_len(&csk->write_queue)) {
+		if (csk->cdev->csk_push_tx_frames(csk, 0))
+			cxgbi_conn_tx_open(csk);
+	} else
+		cxgbi_conn_tx_open(csk);
+done:
+	spin_unlock_bh(&csk->lock);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
+
+static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
+					     unsigned short mtu)
+{
+	int i = 0;
+
+	while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
+		++i;
+
+	return i;
+}
+
+unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
+{
+	unsigned int idx;
+	struct dst_entry *dst = csk->dst;
+
+	csk->advmss = dst_metric_advmss(dst);
+
+	if (csk->advmss > pmtu - 40)
+		csk->advmss = pmtu - 40;
+	if (csk->advmss < csk->cdev->mtus[0] - 40)
+		csk->advmss = csk->cdev->mtus[0] - 40;
+	idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
+
+	return idx;
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
+
+void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
+{
+	cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
+	__skb_queue_tail(&csk->write_queue, skb);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
+
+void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
+		kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
+
+void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
+{
+	int pending = cxgbi_sock_count_pending_wrs(csk);
+
+	if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
+		pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
+			csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
+}
+EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
+
+static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct sk_buff *next;
+	int err, copied = 0;
+
+	spin_lock_bh(&csk->lock);
+
+	if (csk->state != CTP_ESTABLISHED) {
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		err = -EAGAIN;
+		goto out_err;
+	}
+
+	if (csk->err) {
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
+			csk, csk->state, csk->flags, csk->tid, csk->err);
+		err = -EPIPE;
+		goto out_err;
+	}
+
+	if (csk->write_seq - csk->snd_una >= csk->snd_win) {
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
+			csk, csk->state, csk->flags, csk->tid, csk->write_seq,
+			csk->snd_una, csk->snd_win);
+		err = -ENOBUFS;
+		goto out_err;
+	}
+
+	while (skb) {
+		int frags = skb_shinfo(skb)->nr_frags +
+				(skb->len != skb->data_len);
+
+		if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
+			pr_err("csk 0x%p, skb head %u < %u.\n",
+				csk, skb_headroom(skb), cdev->skb_tx_rsvd);
+			err = -EINVAL;
+			goto out_err;
+		}
+
+		if (frags >= SKB_WR_LIST_SIZE) {
+			pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
+				csk, skb_shinfo(skb)->nr_frags, skb->len,
+				skb->data_len, (uint)(SKB_WR_LIST_SIZE));
+			err = -EINVAL;
+			goto out_err;
+		}
+
+		next = skb->next;
+		skb->next = NULL;
+		cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
+		cxgbi_sock_skb_entail(csk, skb);
+		copied += skb->len;
+		csk->write_seq += skb->len +
+				cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
+		skb = next;
+	}
+
+	if (likely(skb_queue_len(&csk->write_queue)))
+		cdev->csk_push_tx_frames(csk, 1);
+done:
+	spin_unlock_bh(&csk->lock);
+	return copied;
+
+out_err:
+	if (copied == 0 && err == -EPIPE)
+		copied = csk->err ? csk->err : -EPIPE;
+	else
+		copied = err;
+	goto done;
+}
+
+static inline void
+scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
+		unsigned int *sgcnt, unsigned int *dlen,
+		unsigned int prot)
+{
+	struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
+
+	*sgl = sdb->table.sgl;
+	*sgcnt = sdb->table.nents;
+	*dlen = sdb->length;
+	/* Caution: for protection sdb, sdb->length is invalid */
+}
+
+void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
+			    struct cxgbi_task_tag_info *ttinfo,
+			    struct scatterlist **sg_pp, unsigned int *sg_off)
+{
+	struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
+	unsigned int offset = sg_off ? *sg_off : 0;
+	dma_addr_t addr = 0UL;
+	unsigned int len = 0;
+	int i;
+
+	memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
+
+	if (sg) {
+		addr = sg_dma_address(sg);
+		len = sg_dma_len(sg);
+	}
+
+	for (i = 0; i < PPOD_PAGES_MAX; i++) {
+		if (sg) {
+			ppod->addr[i] = cpu_to_be64(addr + offset);
+			offset += PAGE_SIZE;
+			if (offset == (len + sg->offset)) {
+				offset = 0;
+				sg = sg_next(sg);
+				if (sg) {
+					addr = sg_dma_address(sg);
+					len = sg_dma_len(sg);
+				}
+			}
+		} else {
+			ppod->addr[i] = 0ULL;
+		}
+	}
+
+	/*
+	 * the fifth address needs to be repeated in the next ppod, so do
+	 * not move sg
+	 */
+	if (sg_pp) {
+		*sg_pp = sg;
+		*sg_off = offset;
+	}
+
+	if (offset == len) {
+		offset = 0;
+		sg = sg_next(sg);
+		if (sg) {
+			addr = sg_dma_address(sg);
+			len = sg_dma_len(sg);
+		}
+	}
+	ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
+
+/*
+ * APIs interacting with open-iscsi libraries
+ */
+
+static unsigned char padding[4];
+
+void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
+			 struct cxgbi_tag_format *tformat, unsigned int ppmax,
+			 unsigned int llimit, unsigned int start,
+			 unsigned int rsvd_factor)
+{
+	int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
+				cdev->lldev, tformat, ppmax, llimit, start,
+				rsvd_factor);
+
+	if (err >= 0) {
+		struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
+
+		if (ppm->ppmax < 1024 ||
+		    ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
+			cdev->flags |= CXGBI_FLAG_DDP_OFF;
+		err = 0;
+	} else {
+		cdev->flags |= CXGBI_FLAG_DDP_OFF;
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
+
+static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
+{
+	int i;
+	int last_sgidx = nents - 1;
+	struct scatterlist *sg = sgl;
+
+	for (i = 0; i < nents; i++, sg = sg_next(sg)) {
+		unsigned int len = sg->length + sg->offset;
+
+		if ((sg->offset & 0x3) || (i && sg->offset) ||
+		    ((i != last_sgidx) && len != PAGE_SIZE)) {
+			log_debug(1 << CXGBI_DBG_DDP,
+				  "sg %u/%u, %u,%u, not aligned.\n",
+				  i, nents, sg->offset, sg->length);
+			goto err_out;
+		}
+	}
+	return 0;
+err_out:
+	return -EINVAL;
+}
+
+static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
+			     struct cxgbi_task_data *tdata, u32 sw_tag,
+			     unsigned int xferlen)
+{
+	struct cxgbi_sock *csk = cconn->cep->csk;
+	struct cxgbi_device *cdev = csk->cdev;
+	struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
+	struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
+	struct scatterlist *sgl = ttinfo->sgl;
+	unsigned int sgcnt = ttinfo->nents;
+	unsigned int sg_offset = sgl->offset;
+	int err;
+
+	if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
+		log_debug(1 << CXGBI_DBG_DDP,
+			  "cdev 0x%p DDP off.\n", cdev);
+		return -EINVAL;
+	}
+
+	if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
+	    ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
+		log_debug(1 << CXGBI_DBG_DDP,
+			  "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
+			  ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
+			  xferlen, ttinfo->nents);
+		return -EINVAL;
+	}
+
+	/* make sure the buffer is suitable for ddp */
+	if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
+		return -EINVAL;
+
+	ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
+			    PAGE_SHIFT;
+
+	/*
+	 * the ddp tag will be used for the itt in the outgoing pdu,
+	 * the itt genrated by libiscsi is saved in the ppm and can be
+	 * retrieved via the ddp tag
+	 */
+	err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
+				      &ttinfo->tag, (unsigned long)sw_tag);
+	if (err < 0) {
+		cconn->ddp_full++;
+		return err;
+	}
+	ttinfo->npods = err;
+
+	 /* setup dma from scsi command sgl */
+	sgl->offset = 0;
+	err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
+	sgl->offset = sg_offset;
+	if (err == 0) {
+		pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
+			__func__, sw_tag, xferlen, sgcnt);
+		goto rel_ppods;
+	}
+	if (err != ttinfo->nr_pages) {
+		log_debug(1 << CXGBI_DBG_DDP,
+			  "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
+			  __func__, sw_tag, xferlen, sgcnt, err);
+	}
+
+	ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
+	ttinfo->cid = csk->port_id;
+
+	cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
+				xferlen, &ttinfo->hdr);
+
+	if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
+		/* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
+		ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
+	} else {
+		/* write ppod from control queue now */
+		err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
+		if (err < 0)
+			goto rel_ppods;
+	}
+
+	return 0;
+
+rel_ppods:
+	cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
+
+	if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
+		ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
+		dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
+	}
+	return -EINVAL;
+}
+
+static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
+{
+	struct scsi_cmnd *sc = task->sc;
+	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_device *cdev = cconn->chba->cdev;
+	struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
+	u32 tag = ntohl((__force u32)hdr_itt);
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		  "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
+		  cdev, task, tag);
+	if (sc &&
+	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
+	    cxgbi_ppm_is_ddp_tag(ppm, tag)) {
+		struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+		struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
+
+		if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
+			cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
+		cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
+		dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
+			     DMA_FROM_DEVICE);
+	}
+}
+
+static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
+{
+	/* assume idx and age both are < 0x7FFF (32767) */
+	return (idx << 16) | age;
+}
+
+static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
+{
+	struct scsi_cmnd *sc = task->sc;
+	struct iscsi_conn *conn = task->conn;
+	struct iscsi_session *sess = conn->session;
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_device *cdev = cconn->chba->cdev;
+	struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
+	u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
+	u32 tag = 0;
+	int err = -EINVAL;
+
+	if (sc &&
+	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
+	) {
+		struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+		struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
+
+		scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
+				&tdata->dlen, 0);
+		err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
+		if (!err)
+			tag = ttinfo->tag;
+		else
+			 log_debug(1 << CXGBI_DBG_DDP,
+				   "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
+				   cconn->cep->csk, task, tdata->dlen,
+				   ttinfo->nents);
+	}
+
+	if (err < 0) {
+		err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
+		if (err < 0)
+			return err;
+	}
+	/*  the itt need to sent in big-endian order */
+	*hdr_itt = (__force itt_t)htonl(tag);
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		  "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
+		  cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
+	return 0;
+}
+
+void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
+{
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_device *cdev = cconn->chba->cdev;
+	struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
+	u32 tag = ntohl((__force u32)itt);
+	u32 sw_bits;
+
+	if (ppm) {
+		if (cxgbi_ppm_is_ddp_tag(ppm, tag))
+			sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
+		else
+			sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
+	} else {
+		sw_bits = tag;
+	}
+
+	cxgbi_decode_sw_tag(sw_bits, idx, age);
+	log_debug(1 << CXGBI_DBG_DDP,
+		  "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
+		  cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
+		  age ? *age : 0xFF);
+}
+EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
+
+void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
+{
+	struct iscsi_conn *conn = csk->user_data;
+
+	if (conn) {
+		log_debug(1 << CXGBI_DBG_SOCK,
+			"csk 0x%p, cid %d.\n", csk, conn->id);
+		iscsi_conn_queue_work(conn);
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
+
+/*
+ * pdu receive, interact with libiscsi_tcp
+ */
+static inline int read_pdu_skb(struct iscsi_conn *conn,
+			       struct sk_buff *skb,
+			       unsigned int offset,
+			       int offloaded)
+{
+	int status = 0;
+	int bytes_read;
+
+	bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
+	switch (status) {
+	case ISCSI_TCP_CONN_ERR:
+		pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
+			  skb, offset, offloaded);
+		return -EIO;
+	case ISCSI_TCP_SUSPENDED:
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			"skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
+			skb, offset, offloaded, bytes_read);
+		/* no transfer - just have caller flush queue */
+		return bytes_read;
+	case ISCSI_TCP_SKB_DONE:
+		pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
+			skb, offset, offloaded);
+		/*
+		 * pdus should always fit in the skb and we should get
+		 * segment done notifcation.
+		 */
+		iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
+		return -EFAULT;
+	case ISCSI_TCP_SEGMENT_DONE:
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			"skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
+			skb, offset, offloaded, bytes_read);
+		return bytes_read;
+	default:
+		pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
+			skb, offset, offloaded, status);
+		return -EINVAL;
+	}
+}
+
+static int
+skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
+		 struct sk_buff *skb)
+{
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	int err;
+
+	log_debug(1 << CXGBI_DBG_PDU_RX,
+		"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
+		conn, skb, skb->len, cxgbi_skcb_flags(skb));
+
+	if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
+		pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
+		iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
+		return -EIO;
+	}
+
+	if (conn->hdrdgst_en &&
+	    cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
+		pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
+		iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
+		return -EIO;
+	}
+
+	if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
+	    cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
+		/* If completion flag is set and data is directly
+		 * placed in to the host memory then update
+		 * task->exp_datasn to the datasn in completion
+		 * iSCSI hdr as T6 adapter generates completion only
+		 * for the last pdu of a sequence.
+		 */
+		itt_t itt = ((struct iscsi_data *)skb->data)->itt;
+		struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
+		u32 data_sn = be32_to_cpu(((struct iscsi_data *)
+							skb->data)->datasn);
+		if (task && task->sc) {
+			struct iscsi_tcp_task *tcp_task = task->dd_data;
+
+			tcp_task->exp_datasn = data_sn;
+		}
+	}
+
+	err = read_pdu_skb(conn, skb, 0, 0);
+	if (likely(err >= 0)) {
+		struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
+		u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
+
+		if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
+			cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
+	}
+
+	return err;
+}
+
+static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
+			     struct sk_buff *skb, unsigned int offset)
+{
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	bool offloaded = 0;
+	int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
+
+	log_debug(1 << CXGBI_DBG_PDU_RX,
+		"conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
+		conn, skb, skb->len, cxgbi_skcb_flags(skb));
+
+	if (conn->datadgst_en &&
+	    cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
+		pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
+			conn, lskb, cxgbi_skcb_flags(lskb));
+		iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
+		return -EIO;
+	}
+
+	if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
+		return 0;
+
+	/* coalesced, add header digest length */
+	if (lskb == skb && conn->hdrdgst_en)
+		offset += ISCSI_DIGEST_SIZE;
+
+	if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
+		offloaded = 1;
+
+	if (opcode == ISCSI_OP_SCSI_DATA_IN)
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			"skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
+			skb, opcode, ntohl(tcp_conn->in.hdr->itt),
+			tcp_conn->in.datalen, offloaded ? "is" : "not");
+
+	return read_pdu_skb(conn, skb, offset, offloaded);
+}
+
+static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	int must_send;
+	u32 credits;
+
+	log_debug(1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
+		csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
+		csk->rcv_wup, cdev->rx_credit_thres,
+		csk->rcv_win);
+
+	if (!cdev->rx_credit_thres)
+		return;
+
+	if (csk->state != CTP_ESTABLISHED)
+		return;
+
+	credits = csk->copied_seq - csk->rcv_wup;
+	if (unlikely(!credits))
+		return;
+	must_send = credits + 16384 >= csk->rcv_win;
+	if (must_send || credits >= cdev->rx_credit_thres)
+		csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
+}
+
+void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct iscsi_conn *conn = csk->user_data;
+	struct sk_buff *skb;
+	unsigned int read = 0;
+	int err = 0;
+
+	log_debug(1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p, conn 0x%p.\n", csk, conn);
+
+	if (unlikely(!conn || conn->suspend_rx)) {
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			"csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
+			csk, conn, conn ? conn->id : 0xFF,
+			conn ? conn->suspend_rx : 0xFF);
+		return;
+	}
+
+	while (!err) {
+		skb = skb_peek(&csk->receive_queue);
+		if (!skb ||
+		    !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
+			if (skb)
+				log_debug(1 << CXGBI_DBG_PDU_RX,
+					"skb 0x%p, NOT ready 0x%lx.\n",
+					skb, cxgbi_skcb_flags(skb));
+			break;
+		}
+		__skb_unlink(skb, &csk->receive_queue);
+
+		read += cxgbi_skcb_rx_pdulen(skb);
+		log_debug(1 << CXGBI_DBG_PDU_RX,
+			"csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
+			csk, skb, skb->len, cxgbi_skcb_flags(skb),
+			cxgbi_skcb_rx_pdulen(skb));
+
+		if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
+			err = skb_read_pdu_bhs(csk, conn, skb);
+			if (err < 0) {
+				pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
+					"f 0x%lx, plen %u.\n",
+					csk, skb, skb->len,
+					cxgbi_skcb_flags(skb),
+					cxgbi_skcb_rx_pdulen(skb));
+				goto skb_done;
+			}
+			err = skb_read_pdu_data(conn, skb, skb,
+						err + cdev->skb_rx_extra);
+			if (err < 0)
+				pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
+					"f 0x%lx, plen %u.\n",
+					csk, skb, skb->len,
+					cxgbi_skcb_flags(skb),
+					cxgbi_skcb_rx_pdulen(skb));
+		} else {
+			err = skb_read_pdu_bhs(csk, conn, skb);
+			if (err < 0) {
+				pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
+					"f 0x%lx, plen %u.\n",
+					csk, skb, skb->len,
+					cxgbi_skcb_flags(skb),
+					cxgbi_skcb_rx_pdulen(skb));
+				goto skb_done;
+			}
+
+			if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
+				struct sk_buff *dskb;
+
+				dskb = skb_peek(&csk->receive_queue);
+				if (!dskb) {
+					pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
+						" plen %u, NO data.\n",
+						csk, skb, skb->len,
+						cxgbi_skcb_flags(skb),
+						cxgbi_skcb_rx_pdulen(skb));
+					err = -EIO;
+					goto skb_done;
+				}
+				__skb_unlink(dskb, &csk->receive_queue);
+
+				err = skb_read_pdu_data(conn, skb, dskb, 0);
+				if (err < 0)
+					pr_err("data, csk 0x%p, skb 0x%p,%u, "
+						"f 0x%lx, plen %u, dskb 0x%p,"
+						"%u.\n",
+						csk, skb, skb->len,
+						cxgbi_skcb_flags(skb),
+						cxgbi_skcb_rx_pdulen(skb),
+						dskb, dskb->len);
+				__kfree_skb(dskb);
+			} else
+				err = skb_read_pdu_data(conn, skb, skb, 0);
+		}
+skb_done:
+		__kfree_skb(skb);
+
+		if (err < 0)
+			break;
+	}
+
+	log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
+	if (read) {
+		csk->copied_seq += read;
+		csk_return_rx_credits(csk, read);
+		conn->rxdata_octets += read;
+	}
+
+	if (err < 0) {
+		pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
+			csk, conn, err, read);
+		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
+
+static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
+				unsigned int offset, unsigned int *off,
+				struct scatterlist **sgp)
+{
+	int i;
+	struct scatterlist *sg;
+
+	for_each_sg(sgl, sg, sgcnt, i) {
+		if (offset < sg->length) {
+			*off = offset;
+			*sgp = sg;
+			return 0;
+		}
+		offset -= sg->length;
+	}
+	return -EFAULT;
+}
+
+static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
+				unsigned int dlen, struct page_frag *frags,
+				int frag_max)
+{
+	unsigned int datalen = dlen;
+	unsigned int sglen = sg->length - sgoffset;
+	struct page *page = sg_page(sg);
+	int i;
+
+	i = 0;
+	do {
+		unsigned int copy;
+
+		if (!sglen) {
+			sg = sg_next(sg);
+			if (!sg) {
+				pr_warn("sg %d NULL, len %u/%u.\n",
+					i, datalen, dlen);
+				return -EINVAL;
+			}
+			sgoffset = 0;
+			sglen = sg->length;
+			page = sg_page(sg);
+
+		}
+		copy = min(datalen, sglen);
+		if (i && page == frags[i - 1].page &&
+		    sgoffset + sg->offset ==
+			frags[i - 1].offset + frags[i - 1].size) {
+			frags[i - 1].size += copy;
+		} else {
+			if (i >= frag_max) {
+				pr_warn("too many pages %u, dlen %u.\n",
+					frag_max, dlen);
+				return -EINVAL;
+			}
+
+			frags[i].page = page;
+			frags[i].offset = sg->offset + sgoffset;
+			frags[i].size = copy;
+			i++;
+		}
+		datalen -= copy;
+		sgoffset += copy;
+		sglen -= copy;
+	} while (datalen);
+
+	return i;
+}
+
+int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
+{
+	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_device *cdev = cconn->chba->cdev;
+	struct iscsi_conn *conn = task->conn;
+	struct iscsi_tcp_task *tcp_task = task->dd_data;
+	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+	struct scsi_cmnd *sc = task->sc;
+	struct cxgbi_sock *csk = cconn->cep->csk;
+	struct net_device *ndev = cdev->ports[csk->port_id];
+	int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
+
+	tcp_task->dd_data = tdata;
+	task->hdr = NULL;
+
+	if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
+	    (opcode == ISCSI_OP_SCSI_DATA_OUT ||
+	     (opcode == ISCSI_OP_SCSI_CMD &&
+	      (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
+		/* data could goes into skb head */
+		headroom += min_t(unsigned int,
+				SKB_MAX_HEAD(cdev->skb_tx_rsvd),
+				conn->max_xmit_dlength);
+
+	tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
+	if (!tdata->skb) {
+		ndev->stats.tx_dropped++;
+		return -ENOMEM;
+	}
+
+	skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
+
+	if (task->sc) {
+		task->hdr = (struct iscsi_hdr *)tdata->skb->data;
+	} else {
+		task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
+		if (!task->hdr) {
+			__kfree_skb(tdata->skb);
+			tdata->skb = NULL;
+			ndev->stats.tx_dropped++;
+			return -ENOMEM;
+		}
+	}
+	task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
+
+	/* data_out uses scsi_cmd's itt */
+	if (opcode != ISCSI_OP_SCSI_DATA_OUT)
+		task_reserve_itt(task, &task->hdr->itt);
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
+		"task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
+		task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
+		conn->max_xmit_dlength, ntohl(task->hdr->itt));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
+
+static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
+{
+	if (hcrc || dcrc) {
+		u8 submode = 0;
+
+		if (hcrc)
+			submode |= 1;
+		if (dcrc)
+			submode |= 2;
+		cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
+	} else
+		cxgbi_skcb_ulp_mode(skb) = 0;
+}
+
+int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
+			      unsigned int count)
+{
+	struct iscsi_conn *conn = task->conn;
+	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+	struct sk_buff *skb = tdata->skb;
+	unsigned int datalen = count;
+	int i, padlen = iscsi_padding(count);
+	struct page *pg;
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
+		"task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
+		task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
+		ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
+
+	skb_put(skb, task->hdr_len);
+	tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
+	if (!count)
+		return 0;
+
+	if (task->sc) {
+		struct scsi_data_buffer *sdb = scsi_out(task->sc);
+		struct scatterlist *sg = NULL;
+		int err;
+
+		tdata->offset = offset;
+		tdata->count = count;
+		err = sgl_seek_offset(
+					sdb->table.sgl, sdb->table.nents,
+					tdata->offset, &tdata->sgoffset, &sg);
+		if (err < 0) {
+			pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
+				sdb->table.nents, tdata->offset, sdb->length);
+			return err;
+		}
+		err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
+					tdata->frags, MAX_PDU_FRAGS);
+		if (err < 0) {
+			pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
+				sdb->table.nents, tdata->offset, tdata->count);
+			return err;
+		}
+		tdata->nr_frags = err;
+
+		if (tdata->nr_frags > MAX_SKB_FRAGS ||
+		    (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
+			char *dst = skb->data + task->hdr_len;
+			struct page_frag *frag = tdata->frags;
+
+			/* data fits in the skb's headroom */
+			for (i = 0; i < tdata->nr_frags; i++, frag++) {
+				char *src = kmap_atomic(frag->page);
+
+				memcpy(dst, src+frag->offset, frag->size);
+				dst += frag->size;
+				kunmap_atomic(src);
+			}
+			if (padlen) {
+				memset(dst, 0, padlen);
+				padlen = 0;
+			}
+			skb_put(skb, count + padlen);
+		} else {
+			/* data fit into frag_list */
+			for (i = 0; i < tdata->nr_frags; i++) {
+				__skb_fill_page_desc(skb, i,
+						tdata->frags[i].page,
+						tdata->frags[i].offset,
+						tdata->frags[i].size);
+				skb_frag_ref(skb, i);
+			}
+			skb_shinfo(skb)->nr_frags = tdata->nr_frags;
+			skb->len += count;
+			skb->data_len += count;
+			skb->truesize += count;
+		}
+
+	} else {
+		pg = virt_to_page(task->data);
+
+		get_page(pg);
+		skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
+					count);
+		skb->len += count;
+		skb->data_len += count;
+		skb->truesize += count;
+	}
+
+	if (padlen) {
+		i = skb_shinfo(skb)->nr_frags;
+		skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
+				virt_to_page(padding), offset_in_page(padding),
+				padlen);
+
+		skb->data_len += padlen;
+		skb->truesize += padlen;
+		skb->len += padlen;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
+
+int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
+{
+	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+	struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
+	struct sk_buff *skb = tdata->skb;
+	struct cxgbi_sock *csk = NULL;
+	unsigned int datalen;
+	int err;
+
+	if (!skb) {
+		log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
+			"task 0x%p\n", task);
+		return 0;
+	}
+
+	if (cconn && cconn->cep)
+		csk = cconn->cep->csk;
+	if (!csk) {
+		log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
+			  "task 0x%p, csk gone.\n", task);
+		return -EPIPE;
+	}
+
+	tdata->skb = NULL;
+	datalen = skb->data_len;
+
+	/* write ppod first if using ofldq to write ppod */
+	if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
+		struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
+
+		ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
+		if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
+			pr_err("task 0x%p, ppod writing using ofldq failed.\n",
+			       task);
+			/* continue. Let fl get the data */
+	}
+
+	if (!task->sc)
+		memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
+
+	err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
+	if (err > 0) {
+		int pdulen = err;
+
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
+			task, task->sc, skb, skb->len, skb->data_len, err);
+
+		if (task->conn->hdrdgst_en)
+			pdulen += ISCSI_DIGEST_SIZE;
+
+		if (datalen && task->conn->datadgst_en)
+			pdulen += ISCSI_DIGEST_SIZE;
+
+		task->conn->txdata_octets += pdulen;
+		return 0;
+	}
+
+	if (err == -EAGAIN || err == -ENOBUFS) {
+		log_debug(1 << CXGBI_DBG_PDU_TX,
+			"task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
+			task, skb, skb->len, skb->data_len, err);
+		/* reset skb to send when we are called again */
+		tdata->skb = skb;
+		return err;
+	}
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
+		"itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
+		task->itt, skb, skb->len, skb->data_len, err);
+
+	__kfree_skb(skb);
+
+	iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
+	iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
+	return err;
+}
+EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
+
+void cxgbi_cleanup_task(struct iscsi_task *task)
+{
+	struct iscsi_tcp_task *tcp_task = task->dd_data;
+	struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
+
+	if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
+		pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
+			task, task->sc, tcp_task,
+			tcp_task ? tcp_task->dd_data : NULL, tdata);
+		return;
+	}
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"task 0x%p, skb 0x%p, itt 0x%x.\n",
+		task, tdata->skb, task->hdr_itt);
+
+	tcp_task->dd_data = NULL;
+
+	if (!task->sc)
+		kfree(task->hdr);
+	task->hdr = NULL;
+
+	/*  never reached the xmit task callout */
+	if (tdata->skb) {
+		__kfree_skb(tdata->skb);
+		tdata->skb = NULL;
+	}
+
+	task_release_itt(task, task->hdr_itt);
+	memset(tdata, 0, sizeof(*tdata));
+
+	iscsi_tcp_cleanup_task(task);
+}
+EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
+
+void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
+				struct iscsi_stats *stats)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+
+	stats->txdata_octets = conn->txdata_octets;
+	stats->rxdata_octets = conn->rxdata_octets;
+	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
+	stats->dataout_pdus = conn->dataout_pdus_cnt;
+	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
+	stats->datain_pdus = conn->datain_pdus_cnt;
+	stats->r2t_pdus = conn->r2t_pdus_cnt;
+	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+	stats->digest_err = 0;
+	stats->timeout_err = 0;
+	stats->custom_length = 1;
+	strcpy(stats->custom[0].desc, "eh_abort_cnt");
+	stats->custom[0].value = conn->eh_abort_cnt;
+}
+EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
+
+static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
+{
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_device *cdev = cconn->chba->cdev;
+	unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
+	unsigned int max_def = 512 * MAX_SKB_FRAGS;
+	unsigned int max = max(max_def, headroom);
+
+	max = min(cconn->chba->cdev->tx_max_size, max);
+	if (conn->max_xmit_dlength)
+		conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
+	else
+		conn->max_xmit_dlength = max;
+	cxgbi_align_pdu_size(conn->max_xmit_dlength);
+
+	return 0;
+}
+
+static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
+{
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	unsigned int max = cconn->chba->cdev->rx_max_size;
+
+	cxgbi_align_pdu_size(max);
+
+	if (conn->max_recv_dlength) {
+		if (conn->max_recv_dlength > max) {
+			pr_err("MaxRecvDataSegmentLength %u > %u.\n",
+				conn->max_recv_dlength, max);
+			return -EINVAL;
+		}
+		conn->max_recv_dlength = min(conn->max_recv_dlength, max);
+		cxgbi_align_pdu_size(conn->max_recv_dlength);
+	} else
+		conn->max_recv_dlength = max;
+
+	return 0;
+}
+
+int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
+			enum iscsi_param param, char *buf, int buflen)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_sock *csk = cconn->cep->csk;
+	int err;
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"cls_conn 0x%p, param %d, buf(%d) %s.\n",
+		cls_conn, param, buflen, buf);
+
+	switch (param) {
+	case ISCSI_PARAM_HDRDGST_EN:
+		err = iscsi_set_param(cls_conn, param, buf, buflen);
+		if (!err && conn->hdrdgst_en)
+			err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
+							conn->hdrdgst_en,
+							conn->datadgst_en);
+		break;
+	case ISCSI_PARAM_DATADGST_EN:
+		err = iscsi_set_param(cls_conn, param, buf, buflen);
+		if (!err && conn->datadgst_en)
+			err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
+							conn->hdrdgst_en,
+							conn->datadgst_en);
+		break;
+	case ISCSI_PARAM_MAX_R2T:
+		return iscsi_tcp_set_max_r2t(conn, buf);
+	case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		err = iscsi_set_param(cls_conn, param, buf, buflen);
+		if (!err)
+			err = cxgbi_conn_max_recv_dlength(conn);
+		break;
+	case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		err = iscsi_set_param(cls_conn, param, buf, buflen);
+		if (!err)
+			err = cxgbi_conn_max_xmit_dlength(conn);
+		break;
+	default:
+		return iscsi_set_param(cls_conn, param, buf, buflen);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
+
+static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
+{
+	int len;
+
+	cxgbi_sock_get(csk);
+	len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
+	cxgbi_sock_put(csk);
+
+	return len;
+}
+
+static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
+{
+	int len;
+
+	cxgbi_sock_get(csk);
+	if (csk->csk_family == AF_INET)
+		len = sprintf(buf, "%pI4",
+			      &csk->daddr.sin_addr.s_addr);
+	else
+		len = sprintf(buf, "%pI6",
+			      &csk->daddr6.sin6_addr);
+
+	cxgbi_sock_put(csk);
+
+	return len;
+}
+
+int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
+		       char *buf)
+{
+	struct cxgbi_endpoint *cep = ep->dd_data;
+	struct cxgbi_sock *csk;
+	int len;
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"cls_conn 0x%p, param %d.\n", ep, param);
+
+	switch (param) {
+	case ISCSI_PARAM_CONN_PORT:
+	case ISCSI_PARAM_CONN_ADDRESS:
+		if (!cep)
+			return -ENOTCONN;
+
+		csk = cep->csk;
+		if (!csk)
+			return -ENOTCONN;
+
+		return iscsi_conn_get_addr_param((struct sockaddr_storage *)
+						 &csk->daddr, param, buf);
+	default:
+		return -ENOSYS;
+	}
+	return len;
+}
+EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
+
+struct iscsi_cls_conn *
+cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
+{
+	struct iscsi_cls_conn *cls_conn;
+	struct iscsi_conn *conn;
+	struct iscsi_tcp_conn *tcp_conn;
+	struct cxgbi_conn *cconn;
+
+	cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
+	if (!cls_conn)
+		return NULL;
+
+	conn = cls_conn->dd_data;
+	tcp_conn = conn->dd_data;
+	cconn = tcp_conn->dd_data;
+	cconn->iconn = conn;
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
+		cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
+
+	return cls_conn;
+}
+EXPORT_SYMBOL_GPL(cxgbi_create_conn);
+
+int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
+				struct iscsi_cls_conn *cls_conn,
+				u64 transport_eph, int is_leading)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+	struct cxgbi_conn *cconn = tcp_conn->dd_data;
+	struct cxgbi_ppm *ppm;
+	struct iscsi_endpoint *ep;
+	struct cxgbi_endpoint *cep;
+	struct cxgbi_sock *csk;
+	int err;
+
+	ep = iscsi_lookup_endpoint(transport_eph);
+	if (!ep)
+		return -EINVAL;
+
+	/*  setup ddp pagesize */
+	cep = ep->dd_data;
+	csk = cep->csk;
+
+	ppm = csk->cdev->cdev2ppm(csk->cdev);
+	err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
+					     ppm->tformat.pgsz_idx_dflt);
+	if (err < 0)
+		return err;
+
+	err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+	if (err)
+		return -EINVAL;
+
+	/*  calculate the tag idx bits needed for this conn based on cmds_max */
+	cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
+
+	write_lock_bh(&csk->callback_lock);
+	csk->user_data = conn;
+	cconn->chba = cep->chba;
+	cconn->cep = cep;
+	cep->cconn = cconn;
+	write_unlock_bh(&csk->callback_lock);
+
+	cxgbi_conn_max_xmit_dlength(conn);
+	cxgbi_conn_max_recv_dlength(conn);
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
+		cls_session, cls_conn, ep, cconn, csk);
+	/*  init recv engine */
+	iscsi_tcp_hdr_recv_prep(tcp_conn);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
+
+struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
+						u16 cmds_max, u16 qdepth,
+						u32 initial_cmdsn)
+{
+	struct cxgbi_endpoint *cep;
+	struct cxgbi_hba *chba;
+	struct Scsi_Host *shost;
+	struct iscsi_cls_session *cls_session;
+	struct iscsi_session *session;
+
+	if (!ep) {
+		pr_err("missing endpoint.\n");
+		return NULL;
+	}
+
+	cep = ep->dd_data;
+	chba = cep->chba;
+	shost = chba->shost;
+
+	BUG_ON(chba != iscsi_host_priv(shost));
+
+	cls_session = iscsi_session_setup(chba->cdev->itp, shost,
+					cmds_max, 0,
+					sizeof(struct iscsi_tcp_task) +
+					sizeof(struct cxgbi_task_data),
+					initial_cmdsn, ISCSI_MAX_TARGET);
+	if (!cls_session)
+		return NULL;
+
+	session = cls_session->dd_data;
+	if (iscsi_tcp_r2tpool_alloc(session))
+		goto remove_session;
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
+	return cls_session;
+
+remove_session:
+	iscsi_session_teardown(cls_session);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_create_session);
+
+void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
+{
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"cls sess 0x%p.\n", cls_session);
+
+	iscsi_tcp_r2tpool_free(cls_session->dd_data);
+	iscsi_session_teardown(cls_session);
+}
+EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
+
+int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
+			char *buf, int buflen)
+{
+	struct cxgbi_hba *chba = iscsi_host_priv(shost);
+
+	if (!chba->ndev) {
+		shost_printk(KERN_ERR, shost, "Could not get host param. "
+				"netdev for host not set.\n");
+		return -ENODEV;
+	}
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
+		shost, chba, chba->ndev->name, param, buflen, buf);
+
+	switch (param) {
+	case ISCSI_HOST_PARAM_IPADDRESS:
+	{
+		__be32 addr = in_aton(buf);
+		log_debug(1 << CXGBI_DBG_ISCSI,
+			"hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
+		cxgbi_set_iscsi_ipv4(chba, addr);
+		return 0;
+	}
+	case ISCSI_HOST_PARAM_HWADDRESS:
+	case ISCSI_HOST_PARAM_NETDEV_NAME:
+		return 0;
+	default:
+		return iscsi_host_set_param(shost, param, buf, buflen);
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
+
+int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
+			char *buf)
+{
+	struct cxgbi_hba *chba = iscsi_host_priv(shost);
+	int len = 0;
+
+	if (!chba->ndev) {
+		shost_printk(KERN_ERR, shost, "Could not get host param. "
+				"netdev for host not set.\n");
+		return -ENODEV;
+	}
+
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"shost 0x%p, hba 0x%p,%s, param %d.\n",
+		shost, chba, chba->ndev->name, param);
+
+	switch (param) {
+	case ISCSI_HOST_PARAM_HWADDRESS:
+		len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
+		break;
+	case ISCSI_HOST_PARAM_NETDEV_NAME:
+		len = sprintf(buf, "%s\n", chba->ndev->name);
+		break;
+	case ISCSI_HOST_PARAM_IPADDRESS:
+	{
+		struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
+							   chba->port_id);
+		if (csk) {
+			len = sprintf(buf, "%pIS",
+				      (struct sockaddr *)&csk->saddr);
+		}
+		log_debug(1 << CXGBI_DBG_ISCSI,
+			  "hba %s, addr %s.\n", chba->ndev->name, buf);
+		break;
+	}
+	default:
+		return iscsi_host_get_param(shost, param, buf);
+	}
+
+	return len;
+}
+EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
+
+struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
+					struct sockaddr *dst_addr,
+					int non_blocking)
+{
+	struct iscsi_endpoint *ep;
+	struct cxgbi_endpoint *cep;
+	struct cxgbi_hba *hba = NULL;
+	struct cxgbi_sock *csk;
+	int ifindex = 0;
+	int err = -EINVAL;
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
+		"shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
+		shost, non_blocking, dst_addr);
+
+	if (shost) {
+		hba = iscsi_host_priv(shost);
+		if (!hba) {
+			pr_info("shost 0x%p, priv NULL.\n", shost);
+			goto err_out;
+		}
+
+		rtnl_lock();
+		if (!vlan_uses_dev(hba->ndev))
+			ifindex = hba->ndev->ifindex;
+		rtnl_unlock();
+	}
+
+	if (dst_addr->sa_family == AF_INET) {
+		csk = cxgbi_check_route(dst_addr, ifindex);
+#if IS_ENABLED(CONFIG_IPV6)
+	} else if (dst_addr->sa_family == AF_INET6) {
+		csk = cxgbi_check_route6(dst_addr, ifindex);
+#endif
+	} else {
+		pr_info("address family 0x%x NOT supported.\n",
+			dst_addr->sa_family);
+		err = -EAFNOSUPPORT;
+		return (struct iscsi_endpoint *)ERR_PTR(err);
+	}
+
+	if (IS_ERR(csk))
+		return (struct iscsi_endpoint *)csk;
+	cxgbi_sock_get(csk);
+
+	if (!hba)
+		hba = csk->cdev->hbas[csk->port_id];
+	else if (hba != csk->cdev->hbas[csk->port_id]) {
+		pr_info("Could not connect through requested host %u"
+			"hba 0x%p != 0x%p (%u).\n",
+			shost->host_no, hba,
+			csk->cdev->hbas[csk->port_id], csk->port_id);
+		err = -ENOSPC;
+		goto release_conn;
+	}
+
+	err = sock_get_port(csk);
+	if (err)
+		goto release_conn;
+
+	cxgbi_sock_set_state(csk, CTP_CONNECTING);
+	err = csk->cdev->csk_init_act_open(csk);
+	if (err)
+		goto release_conn;
+
+	if (cxgbi_sock_is_closing(csk)) {
+		err = -ENOSPC;
+		pr_info("csk 0x%p is closing.\n", csk);
+		goto release_conn;
+	}
+
+	ep = iscsi_create_endpoint(sizeof(*cep));
+	if (!ep) {
+		err = -ENOMEM;
+		pr_info("iscsi alloc ep, OOM.\n");
+		goto release_conn;
+	}
+
+	cep = ep->dd_data;
+	cep->csk = csk;
+	cep->chba = hba;
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
+		"ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
+		ep, cep, csk, hba, hba->ndev->name);
+	return ep;
+
+release_conn:
+	cxgbi_sock_put(csk);
+	cxgbi_sock_closed(csk);
+err_out:
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
+
+int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
+{
+	struct cxgbi_endpoint *cep = ep->dd_data;
+	struct cxgbi_sock *csk = cep->csk;
+
+	if (!cxgbi_sock_is_established(csk))
+		return 0;
+	return 1;
+}
+EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
+
+void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
+{
+	struct cxgbi_endpoint *cep = ep->dd_data;
+	struct cxgbi_conn *cconn = cep->cconn;
+	struct cxgbi_sock *csk = cep->csk;
+
+	log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
+		"ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
+		ep, cep, cconn, csk, csk->state, csk->flags);
+
+	if (cconn && cconn->iconn) {
+		iscsi_suspend_tx(cconn->iconn);
+		write_lock_bh(&csk->callback_lock);
+		cep->csk->user_data = NULL;
+		cconn->cep = NULL;
+		write_unlock_bh(&csk->callback_lock);
+	}
+	iscsi_destroy_endpoint(ep);
+
+	if (likely(csk->state >= CTP_ESTABLISHED))
+		need_active_close(csk);
+	else
+		cxgbi_sock_closed(csk);
+
+	cxgbi_sock_put(csk);
+}
+EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
+
+int cxgbi_iscsi_init(struct iscsi_transport *itp,
+			struct scsi_transport_template **stt)
+{
+	*stt = iscsi_register_transport(itp);
+	if (*stt == NULL) {
+		pr_err("unable to register %s transport 0x%p.\n",
+			itp->name, itp);
+		return -ENODEV;
+	}
+	log_debug(1 << CXGBI_DBG_ISCSI,
+		"%s, registered iscsi transport 0x%p.\n",
+		itp->name, stt);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
+
+void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
+			struct scsi_transport_template **stt)
+{
+	if (*stt) {
+		log_debug(1 << CXGBI_DBG_ISCSI,
+			"de-register transport 0x%p, %s, stt 0x%p.\n",
+			itp, itp->name, *stt);
+		*stt = NULL;
+		iscsi_unregister_transport(itp);
+	}
+}
+EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
+
+umode_t cxgbi_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_HOST_PARAM:
+		switch (param) {
+		case ISCSI_HOST_PARAM_NETDEV_NAME:
+		case ISCSI_HOST_PARAM_HWADDRESS:
+		case ISCSI_HOST_PARAM_IPADDRESS:
+		case ISCSI_HOST_PARAM_INITIATOR_NAME:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+		case ISCSI_PARAM_INITIAL_R2T_EN:
+		case ISCSI_PARAM_MAX_R2T:
+		case ISCSI_PARAM_IMM_DATA_EN:
+		case ISCSI_PARAM_FIRST_BURST:
+		case ISCSI_PARAM_MAX_BURST:
+		case ISCSI_PARAM_PDU_INORDER_EN:
+		case ISCSI_PARAM_DATASEQ_INORDER_EN:
+		case ISCSI_PARAM_ERL:
+		case ISCSI_PARAM_TARGET_NAME:
+		case ISCSI_PARAM_TPGT:
+		case ISCSI_PARAM_USERNAME:
+		case ISCSI_PARAM_PASSWORD:
+		case ISCSI_PARAM_USERNAME_IN:
+		case ISCSI_PARAM_PASSWORD_IN:
+		case ISCSI_PARAM_FAST_ABORT:
+		case ISCSI_PARAM_ABORT_TMO:
+		case ISCSI_PARAM_LU_RESET_TMO:
+		case ISCSI_PARAM_TGT_RESET_TMO:
+		case ISCSI_PARAM_IFACE_NAME:
+		case ISCSI_PARAM_INITIATOR_NAME:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
+
+static int __init libcxgbi_init_module(void)
+{
+	pr_info("%s", version);
+
+	BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
+		     sizeof(struct cxgbi_skb_cb));
+	return 0;
+}
+
+static void __exit libcxgbi_exit_module(void)
+{
+	cxgbi_device_unregister_all(0xFF);
+	return;
+}
+
+module_init(libcxgbi_init_module);
+module_exit(libcxgbi_exit_module);
diff --git a/drivers/scsi/cxgbi/libcxgbi.h b/drivers/scsi/cxgbi/libcxgbi.h
new file mode 100644
index 000000000..3bf7414a7
--- /dev/null
+++ b/drivers/scsi/cxgbi/libcxgbi.h
@@ -0,0 +1,621 @@
+/*
+ * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
+ *
+ * Copyright (c) 2010-2015 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ * Written by: Rakesh Ranjan (rranjan@chelsio.com)
+ */
+
+#ifndef	__LIBCXGBI_H__
+#define	__LIBCXGBI_H__
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/debugfs.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+#include <linux/vmalloc.h>
+#include <linux/version.h>
+#include <scsi/scsi_device.h>
+#include <scsi/libiscsi_tcp.h>
+
+#include <libcxgb_ppm.h>
+
+enum cxgbi_dbg_flag {
+	CXGBI_DBG_ISCSI,
+	CXGBI_DBG_DDP,
+	CXGBI_DBG_TOE,
+	CXGBI_DBG_SOCK,
+
+	CXGBI_DBG_PDU_TX,
+	CXGBI_DBG_PDU_RX,
+	CXGBI_DBG_DEV,
+};
+
+#define log_debug(level, fmt, ...)	\
+	do {	\
+		if (dbg_level & (level)) \
+			pr_info(fmt, ##__VA_ARGS__); \
+	} while (0)
+
+#define pr_info_ipaddr(fmt_trail,					\
+			addr1, addr2, args_trail...)			\
+do {									\
+	if (!((1 << CXGBI_DBG_SOCK) & dbg_level))			\
+		break;							\
+	pr_info("%pISpc - %pISpc, " fmt_trail,				\
+		addr1, addr2, args_trail);				\
+} while (0)
+
+/* max. connections per adapter */
+#define CXGBI_MAX_CONN		16384
+
+/* always allocate rooms for AHS */
+#define SKB_TX_ISCSI_PDU_HEADER_MAX	\
+	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
+
+#define	ISCSI_PDU_NONPAYLOAD_LEN	312 /* bhs(48) + ahs(256) + digest(8)*/
+
+/*
+ * align pdu size to multiple of 512 for better performance
+ */
+#define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
+
+#define ULP2_MODE_ISCSI		2
+
+#define ULP2_MAX_PKT_SIZE	16224
+#define ULP2_MAX_PDU_PAYLOAD	\
+	(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
+
+/*
+ * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
+ * bytes are not sent by the host but are part of the TCP payload and therefore
+ * consume TCP sequence space.
+ */
+static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
+static inline unsigned int cxgbi_ulp_extra_len(int submode)
+{
+	return ulp2_extra_len[submode & 3];
+}
+
+#define CPL_RX_DDP_STATUS_DDP_SHIFT	16 /* ddp'able */
+#define CPL_RX_DDP_STATUS_PAD_SHIFT	19 /* pad error */
+#define CPL_RX_DDP_STATUS_HCRC_SHIFT	20 /* hcrc error */
+#define CPL_RX_DDP_STATUS_DCRC_SHIFT	21 /* dcrc error */
+
+/*
+ * sge_opaque_hdr -
+ * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
+ * and for which we must reserve space.
+ */
+struct sge_opaque_hdr {
+	void *dev;
+	dma_addr_t addr[MAX_SKB_FRAGS + 1];
+};
+
+struct cxgbi_sock {
+	struct cxgbi_device *cdev;
+
+	int tid;
+	int atid;
+	unsigned long flags;
+	unsigned int mtu;
+	unsigned short rss_qid;
+	unsigned short txq_idx;
+	unsigned short advmss;
+	unsigned int tx_chan;
+	unsigned int rx_chan;
+	unsigned int mss_idx;
+	unsigned int smac_idx;
+	unsigned char port_id;
+	int wr_max_cred;
+	int wr_cred;
+	int wr_una_cred;
+	unsigned char hcrc_len;
+	unsigned char dcrc_len;
+
+	void *l2t;
+	struct sk_buff *wr_pending_head;
+	struct sk_buff *wr_pending_tail;
+	struct sk_buff *cpl_close;
+	struct sk_buff *cpl_abort_req;
+	struct sk_buff *cpl_abort_rpl;
+	struct sk_buff *skb_ulp_lhdr;
+	spinlock_t lock;
+	struct kref refcnt;
+	unsigned int state;
+	unsigned int csk_family;
+	union {
+		struct sockaddr_in saddr;
+		struct sockaddr_in6 saddr6;
+	};
+	union {
+		struct sockaddr_in daddr;
+		struct sockaddr_in6 daddr6;
+	};
+	struct dst_entry *dst;
+	struct sk_buff_head receive_queue;
+	struct sk_buff_head write_queue;
+	struct timer_list retry_timer;
+	struct completion cmpl;
+	int err;
+	rwlock_t callback_lock;
+	void *user_data;
+
+	u32 rcv_nxt;
+	u32 copied_seq;
+	u32 rcv_wup;
+	u32 snd_nxt;
+	u32 snd_una;
+	u32 write_seq;
+	u32 snd_win;
+	u32 rcv_win;
+};
+
+/*
+ * connection states
+ */
+enum cxgbi_sock_states{
+	CTP_CLOSED,
+	CTP_CONNECTING,
+	CTP_ACTIVE_OPEN,
+	CTP_ESTABLISHED,
+	CTP_ACTIVE_CLOSE,
+	CTP_PASSIVE_CLOSE,
+	CTP_CLOSE_WAIT_1,
+	CTP_CLOSE_WAIT_2,
+	CTP_ABORTING,
+};
+
+/*
+ * Connection flags -- many to track some close related events.
+ */
+enum cxgbi_sock_flags {
+	CTPF_ABORT_RPL_RCVD,	/*received one ABORT_RPL_RSS message */
+	CTPF_ABORT_REQ_RCVD,	/*received one ABORT_REQ_RSS message */
+	CTPF_ABORT_RPL_PENDING,	/* expecting an abort reply */
+	CTPF_TX_DATA_SENT,	/* already sent a TX_DATA WR */
+	CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
+	CTPF_HAS_ATID,		/* reserved atid */
+	CTPF_HAS_TID,		/* reserved hw tid */
+	CTPF_OFFLOAD_DOWN,	/* offload function off */
+	CTPF_LOGOUT_RSP_RCVD,   /* received logout response */
+};
+
+struct cxgbi_skb_rx_cb {
+	__u32 ddigest;
+	__u32 pdulen;
+};
+
+struct cxgbi_skb_tx_cb {
+	void *handle;
+	void *arp_err_handler;
+	struct sk_buff *wr_next;
+};
+
+enum cxgbi_skcb_flags {
+	SKCBF_TX_NEED_HDR,	/* packet needs a header */
+	SKCBF_TX_MEM_WRITE,     /* memory write */
+	SKCBF_TX_FLAG_COMPL,    /* wr completion flag */
+	SKCBF_RX_COALESCED,	/* received whole pdu */
+	SKCBF_RX_HDR,		/* received pdu header */
+	SKCBF_RX_DATA,		/* received pdu payload */
+	SKCBF_RX_STATUS,	/* received ddp status */
+	SKCBF_RX_ISCSI_COMPL,   /* received iscsi completion */
+	SKCBF_RX_DATA_DDPD,	/* pdu payload ddp'd */
+	SKCBF_RX_HCRC_ERR,	/* header digest error */
+	SKCBF_RX_DCRC_ERR,	/* data digest error */
+	SKCBF_RX_PAD_ERR,	/* padding byte error */
+};
+
+struct cxgbi_skb_cb {
+	union {
+		struct cxgbi_skb_rx_cb rx;
+		struct cxgbi_skb_tx_cb tx;
+	};
+	unsigned char ulp_mode;
+	unsigned long flags;
+	unsigned int seq;
+};
+
+#define CXGBI_SKB_CB(skb)	((struct cxgbi_skb_cb *)&((skb)->cb[0]))
+#define cxgbi_skcb_flags(skb)		(CXGBI_SKB_CB(skb)->flags)
+#define cxgbi_skcb_ulp_mode(skb)	(CXGBI_SKB_CB(skb)->ulp_mode)
+#define cxgbi_skcb_tcp_seq(skb)		(CXGBI_SKB_CB(skb)->seq)
+#define cxgbi_skcb_rx_ddigest(skb)	(CXGBI_SKB_CB(skb)->rx.ddigest)
+#define cxgbi_skcb_rx_pdulen(skb)	(CXGBI_SKB_CB(skb)->rx.pdulen)
+#define cxgbi_skcb_tx_wr_next(skb)	(CXGBI_SKB_CB(skb)->tx.wr_next)
+
+static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
+					enum cxgbi_skcb_flags flag)
+{
+	__set_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
+					enum cxgbi_skcb_flags flag)
+{
+	__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
+				       enum cxgbi_skcb_flags flag)
+{
+	return test_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
+					enum cxgbi_sock_flags flag)
+{
+	__set_bit(flag, &csk->flags);
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, bit %d.\n",
+		csk, csk->state, csk->flags, flag);
+}
+
+static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
+					enum cxgbi_sock_flags flag)
+{
+	__clear_bit(flag, &csk->flags);
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, bit %d.\n",
+		csk, csk->state, csk->flags, flag);
+}
+
+static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
+				enum cxgbi_sock_flags flag)
+{
+	if (csk == NULL)
+		return 0;
+	return test_bit(flag, &csk->flags);
+}
+
+static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, state -> %u.\n",
+		csk, csk->state, csk->flags, state);
+	csk->state = state;
+}
+
+static inline void cxgbi_sock_free(struct kref *kref)
+{
+	struct cxgbi_sock *csk = container_of(kref,
+						struct cxgbi_sock,
+						refcnt);
+	if (csk) {
+		log_debug(1 << CXGBI_DBG_SOCK,
+			"free csk 0x%p, state %u, flags 0x%lx\n",
+			csk, csk->state, csk->flags);
+		kfree(csk);
+	}
+}
+
+static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"%s, put csk 0x%p, ref %u-1.\n",
+		fn, csk, kref_read(&csk->refcnt));
+	kref_put(&csk->refcnt, cxgbi_sock_free);
+}
+#define cxgbi_sock_put(csk)	__cxgbi_sock_put(__func__, csk)
+
+static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"%s, get csk 0x%p, ref %u+1.\n",
+		fn, csk, kref_read(&csk->refcnt));
+	kref_get(&csk->refcnt);
+}
+#define cxgbi_sock_get(csk)	__cxgbi_sock_get(__func__, csk)
+
+static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
+{
+	return csk->state >= CTP_ACTIVE_CLOSE;
+}
+
+static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
+{
+	return csk->state == CTP_ESTABLISHED;
+}
+
+static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(&csk->write_queue)))
+		__kfree_skb(skb);
+}
+
+static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
+{
+	unsigned int wscale = 0;
+
+	while (wscale < 14 && (65535 << wscale) < win)
+		wscale++;
+	return wscale;
+}
+
+static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
+{
+	struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
+
+	if (skb) {
+		__skb_put(skb, wrlen);
+		memset(skb->head, 0, wrlen + dlen);
+	} else
+		pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
+	return skb;
+}
+
+
+/*
+ * The number of WRs needed for an skb depends on the number of fragments
+ * in the skb and whether it has any payload in its main body.  This maps the
+ * length of the gather list represented by an skb into the # of necessary WRs.
+ * The extra two fragments are for iscsi bhs and payload padding.
+ */
+#define SKB_WR_LIST_SIZE	 (MAX_SKB_FRAGS + 2)
+
+static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
+{
+	csk->wr_pending_head = csk->wr_pending_tail = NULL;
+}
+
+static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
+					  struct sk_buff *skb)
+{
+	cxgbi_skcb_tx_wr_next(skb) = NULL;
+	/*
+	 * We want to take an extra reference since both us and the driver
+	 * need to free the packet before it's really freed.
+	 */
+	skb_get(skb);
+
+	if (!csk->wr_pending_head)
+		csk->wr_pending_head = skb;
+	else
+		cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
+	csk->wr_pending_tail = skb;
+}
+
+static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
+{
+	int n = 0;
+	const struct sk_buff *skb = csk->wr_pending_head;
+
+	while (skb) {
+		n += skb->csum;
+		skb = cxgbi_skcb_tx_wr_next(skb);
+	}
+	return n;
+}
+
+static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
+{
+	return csk->wr_pending_head;
+}
+
+static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->wr_pending_head;
+
+	if (likely(skb)) {
+		csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
+		cxgbi_skcb_tx_wr_next(skb) = NULL;
+	}
+	return skb;
+}
+
+void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
+void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
+void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
+void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
+void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
+void cxgbi_sock_closed(struct cxgbi_sock *);
+void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
+void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
+void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
+void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
+void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
+				int);
+unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
+void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
+
+struct cxgbi_hba {
+	struct net_device *ndev;
+	struct net_device *vdev;	/* vlan dev */
+	struct Scsi_Host *shost;
+	struct cxgbi_device *cdev;
+	__be32 ipv4addr;
+	unsigned char port_id;
+};
+
+struct cxgbi_ports_map {
+	unsigned int max_connect;
+	unsigned int used;
+	unsigned short sport_base;
+	spinlock_t lock;
+	unsigned int next;
+	struct cxgbi_sock **port_csk;
+};
+
+#define CXGBI_FLAG_DEV_T3		0x1
+#define CXGBI_FLAG_DEV_T4		0x2
+#define CXGBI_FLAG_ADAPTER_RESET	0x4
+#define CXGBI_FLAG_IPV4_SET		0x10
+#define CXGBI_FLAG_USE_PPOD_OFLDQ       0x40
+#define CXGBI_FLAG_DDP_OFF		0x100
+
+struct cxgbi_device {
+	struct list_head list_head;
+	struct list_head rcu_node;
+	unsigned int flags;
+	struct net_device **ports;
+	void *lldev;
+	struct cxgbi_hba **hbas;
+	const unsigned short *mtus;
+	unsigned char nmtus;
+	unsigned char nports;
+	struct pci_dev *pdev;
+	struct dentry *debugfs_root;
+	struct iscsi_transport *itp;
+	struct module *owner;
+
+	unsigned int pfvf;
+	unsigned int rx_credit_thres;
+	unsigned int skb_tx_rsvd;
+	unsigned int skb_rx_extra;	/* for msg coalesced mode */
+	unsigned int tx_max_size;
+	unsigned int rx_max_size;
+	unsigned int rxq_idx_cntr;
+	struct cxgbi_ports_map pmap;
+
+	void (*dev_ddp_cleanup)(struct cxgbi_device *);
+	struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
+	int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
+			       struct cxgbi_task_tag_info *);
+	void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
+				  struct cxgbi_ppm *,
+				  struct cxgbi_task_tag_info *);
+	int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
+				    unsigned int, int, int);
+	int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
+				   unsigned int, int);
+
+	void (*csk_release_offload_resources)(struct cxgbi_sock *);
+	int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
+	u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
+	int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
+	void (*csk_send_abort_req)(struct cxgbi_sock *);
+	void (*csk_send_close_req)(struct cxgbi_sock *);
+	int (*csk_alloc_cpls)(struct cxgbi_sock *);
+	int (*csk_init_act_open)(struct cxgbi_sock *);
+
+	void *dd_data;
+};
+#define cxgbi_cdev_priv(cdev)	((cdev)->dd_data)
+
+struct cxgbi_conn {
+	struct cxgbi_endpoint *cep;
+	struct iscsi_conn *iconn;
+	struct cxgbi_hba *chba;
+	u32 task_idx_bits;
+	unsigned int ddp_full;
+	unsigned int ddp_tag_full;
+};
+
+struct cxgbi_endpoint {
+	struct cxgbi_conn *cconn;
+	struct cxgbi_hba *chba;
+	struct cxgbi_sock *csk;
+};
+
+#define MAX_PDU_FRAGS	((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
+struct cxgbi_task_data {
+	unsigned short nr_frags;
+	struct page_frag frags[MAX_PDU_FRAGS];
+	struct sk_buff *skb;
+	unsigned int dlen;
+	unsigned int offset;
+	unsigned int count;
+	unsigned int sgoffset;
+	struct cxgbi_task_tag_info ttinfo;
+};
+#define iscsi_task_cxgbi_data(task) \
+	((task)->dd_data + sizeof(struct iscsi_tcp_task))
+
+static inline void *cxgbi_alloc_big_mem(unsigned int size,
+					gfp_t gfp)
+{
+	void *p = kzalloc(size, gfp | __GFP_NOWARN);
+
+	if (!p)
+		p = vzalloc(size);
+
+	return p;
+}
+
+static inline void cxgbi_free_big_mem(void *addr)
+{
+	kvfree(addr);
+}
+
+static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
+{
+	if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
+		chba->ipv4addr = ipaddr;
+	else
+		pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
+			chba->ndev->name);
+}
+
+struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
+void cxgbi_device_unregister(struct cxgbi_device *);
+void cxgbi_device_unregister_all(unsigned int flag);
+struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
+struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
+struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
+						     int *);
+int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
+			struct scsi_host_template *,
+			struct scsi_transport_template *);
+void cxgbi_hbas_remove(struct cxgbi_device *);
+
+int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
+			unsigned int max_conn);
+void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
+
+void cxgbi_conn_tx_open(struct cxgbi_sock *);
+void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
+int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
+int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
+int cxgbi_conn_xmit_pdu(struct iscsi_task *);
+
+void cxgbi_cleanup_task(struct iscsi_task *task);
+
+umode_t cxgbi_attr_is_visible(int param_type, int param);
+void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
+int cxgbi_set_conn_param(struct iscsi_cls_conn *,
+			enum iscsi_param, char *, int);
+int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
+struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
+int cxgbi_bind_conn(struct iscsi_cls_session *,
+			struct iscsi_cls_conn *, u64, int);
+void cxgbi_destroy_session(struct iscsi_cls_session *);
+struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
+			u16, u16, u32);
+int cxgbi_set_host_param(struct Scsi_Host *,
+			enum iscsi_host_param, char *, int);
+int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
+struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
+			struct sockaddr *, int);
+int cxgbi_ep_poll(struct iscsi_endpoint *, int);
+void cxgbi_ep_disconnect(struct iscsi_endpoint *);
+
+int cxgbi_iscsi_init(struct iscsi_transport *,
+			struct scsi_transport_template **);
+void cxgbi_iscsi_cleanup(struct iscsi_transport *,
+			struct scsi_transport_template **);
+void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
+int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
+			unsigned int, unsigned int);
+int cxgbi_ddp_cleanup(struct cxgbi_device *);
+void cxgbi_ddp_page_size_factor(int *);
+void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
+			    struct cxgbi_task_tag_info *,
+			    struct scatterlist **sg_pp, unsigned int *sg_off);
+void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *,
+			 struct cxgbi_tag_format *, unsigned int ppmax,
+			 unsigned int llimit, unsigned int start,
+			 unsigned int rsvd_factor);
+#endif	/*__LIBCXGBI_H__*/