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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/infiniband/ulp/iser
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/infiniband/ulp/iser')
-rw-r--r--drivers/infiniband/ulp/iser/Kconfig13
-rw-r--r--drivers/infiniband/ulp/iser/Makefile5
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.c1087
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.h574
-rw-r--r--drivers/infiniband/ulp/iser/iser_initiator.c747
-rw-r--r--drivers/infiniband/ulp/iser/iser_memory.c391
-rw-r--r--drivers/infiniband/ulp/iser/iser_verbs.c952
7 files changed, 3769 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/Kconfig b/drivers/infiniband/ulp/iser/Kconfig
new file mode 100644
index 0000000000..3016a0c9a9
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config INFINIBAND_ISER
+ tristate "iSCSI Extensions for RDMA (iSER)"
+ depends on SCSI && INET && INFINIBAND_ADDR_TRANS
+ select SCSI_ISCSI_ATTRS
+ help
+ Support for the iSCSI Extensions for RDMA (iSER) Protocol
+ over InfiniBand. This allows you to access storage devices
+ that speak iSCSI over iSER over InfiniBand.
+
+ The iSER protocol is defined by IETF.
+ See <http://www.ietf.org/rfc/rfc5046.txt>
+ and <http://members.infinibandta.org/kwspub/spec/Annex_iSER.PDF>
diff --git a/drivers/infiniband/ulp/iser/Makefile b/drivers/infiniband/ulp/iser/Makefile
new file mode 100644
index 0000000000..2f3e788638
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_INFINIBAND_ISER) += ib_iser.o
+
+ib_iser-y := iser_verbs.o iser_initiator.o iser_memory.o \
+ iscsi_iser.o
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
new file mode 100644
index 0000000000..bb9aaff92c
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -0,0 +1,1087 @@
+/*
+ * iSCSI Initiator over iSER Data-Path
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ * maintained by openib-general@openib.org
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Credits:
+ * Christoph Hellwig
+ * FUJITA Tomonori
+ * Arne Redlich
+ * Zhenyu Wang
+ * Modified by:
+ * Erez Zilber
+ */
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/hardirq.h>
+#include <linux/kfifo.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/scatterlist.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <net/sock.h>
+
+#include <linux/uaccess.h>
+
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+
+#include "iscsi_iser.h"
+
+MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
+
+static const struct scsi_host_template iscsi_iser_sht;
+static struct iscsi_transport iscsi_iser_transport;
+static struct scsi_transport_template *iscsi_iser_scsi_transport;
+static struct workqueue_struct *release_wq;
+static DEFINE_MUTEX(unbind_iser_conn_mutex);
+struct iser_global ig;
+
+int iser_debug_level = 0;
+module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
+
+static int iscsi_iser_set(const char *val, const struct kernel_param *kp);
+static const struct kernel_param_ops iscsi_iser_size_ops = {
+ .set = iscsi_iser_set,
+ .get = param_get_uint,
+};
+
+static unsigned int iscsi_max_lun = 512;
+module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO);
+MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)");
+
+unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS;
+module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)");
+
+bool iser_always_reg = true;
+module_param_named(always_register, iser_always_reg, bool, S_IRUGO);
+MODULE_PARM_DESC(always_register,
+ "Always register memory, even for continuous memory regions (default:true)");
+
+bool iser_pi_enable = false;
+module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO);
+MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
+
+static int iscsi_iser_set(const char *val, const struct kernel_param *kp)
+{
+ int ret;
+ unsigned int n = 0;
+
+ ret = kstrtouint(val, 10, &n);
+ if (ret != 0 || n == 0)
+ return -EINVAL;
+
+ return param_set_uint(val, kp);
+}
+
+/*
+ * iscsi_iser_recv() - Process a successful recv completion
+ * @conn: iscsi connection
+ * @hdr: iscsi header
+ * @rx_data: buffer containing receive data payload
+ * @rx_data_len: length of rx_data
+ *
+ * Notes: In case of data length errors or iscsi PDU completion failures
+ * this routine will signal iscsi layer of connection failure.
+ */
+void iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+ char *rx_data, int rx_data_len)
+{
+ int rc = 0;
+ int datalen;
+
+ /* verify PDU length */
+ datalen = ntoh24(hdr->dlength);
+ if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
+ iser_err("wrong datalen %d (hdr), %d (IB)\n",
+ datalen, rx_data_len);
+ rc = ISCSI_ERR_DATALEN;
+ goto error;
+ }
+
+ if (datalen != rx_data_len)
+ iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
+ datalen, rx_data_len);
+
+ rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
+ if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
+ goto error;
+
+ return;
+error:
+ iscsi_conn_failure(conn, rc);
+}
+
+/**
+ * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
+ * @task: iscsi task
+ * @opcode: iscsi command opcode
+ *
+ * Netes: This routine can't fail, just assign iscsi task
+ * hdr and max hdr size.
+ */
+static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+
+ task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
+ task->hdr_max = sizeof(iser_task->desc.iscsi_header);
+
+ return 0;
+}
+
+/**
+ * iser_initialize_task_headers() - Initialize task headers
+ * @task: iscsi task
+ * @tx_desc: iser tx descriptor
+ *
+ * Notes:
+ * This routine may race with iser teardown flow for scsi
+ * error handling TMFs. So for TMF we should acquire the
+ * state mutex to avoid dereferencing the IB device which
+ * may have already been terminated.
+ */
+int iser_initialize_task_headers(struct iscsi_task *task,
+ struct iser_tx_desc *tx_desc)
+{
+ struct iser_conn *iser_conn = task->conn->dd_data;
+ struct iser_device *device = iser_conn->ib_conn.device;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ u64 dma_addr;
+
+ if (unlikely(iser_conn->state != ISER_CONN_UP))
+ return -ENODEV;
+
+ dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device, dma_addr))
+ return -ENOMEM;
+
+ tx_desc->inv_wr.next = NULL;
+ tx_desc->reg_wr.wr.next = NULL;
+ tx_desc->mapped = true;
+ tx_desc->dma_addr = dma_addr;
+ tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
+ tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
+ tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
+
+ iser_task->iser_conn = iser_conn;
+
+ return 0;
+}
+
+/**
+ * iscsi_iser_task_init() - Initialize iscsi-iser task
+ * @task: iscsi task
+ *
+ * Initialize the task for the scsi command or mgmt command.
+ *
+ * Return: Returns zero on success or -ENOMEM when failing
+ * to init task headers (dma mapping error).
+ */
+static int iscsi_iser_task_init(struct iscsi_task *task)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ int ret;
+
+ ret = iser_initialize_task_headers(task, &iser_task->desc);
+ if (ret) {
+ iser_err("Failed to init task %p, err = %d\n",
+ iser_task, ret);
+ return ret;
+ }
+
+ /* mgmt task */
+ if (!task->sc)
+ return 0;
+
+ iser_task->command_sent = 0;
+ iser_task_rdma_init(iser_task);
+ iser_task->sc = task->sc;
+
+ return 0;
+}
+
+/**
+ * iscsi_iser_mtask_xmit() - xmit management (immediate) task
+ * @conn: iscsi connection
+ * @task: task management task
+ *
+ * Notes:
+ * The function can return -EAGAIN in which case caller must
+ * call it again later, or recover. '0' return code means successful
+ * xmit.
+ *
+ **/
+static int iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
+ struct iscsi_task *task)
+{
+ int error = 0;
+
+ iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
+
+ error = iser_send_control(conn, task);
+
+ /* since iser xmits control with zero copy, tasks can not be recycled
+ * right after sending them.
+ * The recycling scheme is based on whether a response is expected
+ * - if yes, the task is recycled at iscsi_complete_pdu
+ * - if no, the task is recycled at iser_snd_completion
+ */
+ return error;
+}
+
+static int iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
+ struct iscsi_task *task)
+{
+ struct iscsi_r2t_info *r2t = &task->unsol_r2t;
+ struct iscsi_data hdr;
+ int error = 0;
+
+ /* Send data-out PDUs while there's still unsolicited data to send */
+ while (iscsi_task_has_unsol_data(task)) {
+ iscsi_prep_data_out_pdu(task, r2t, &hdr);
+ iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
+ hdr.itt, r2t->data_count);
+
+ /* the buffer description has been passed with the command */
+ /* Send the command */
+ error = iser_send_data_out(conn, task, &hdr);
+ if (error) {
+ r2t->datasn--;
+ goto iscsi_iser_task_xmit_unsol_data_exit;
+ }
+ r2t->sent += r2t->data_count;
+ iser_dbg("Need to send %d more as data-out PDUs\n",
+ r2t->data_length - r2t->sent);
+ }
+
+iscsi_iser_task_xmit_unsol_data_exit:
+ return error;
+}
+
+/**
+ * iscsi_iser_task_xmit() - xmit iscsi-iser task
+ * @task: iscsi task
+ *
+ * Return: zero on success or escalates $error on failure.
+ */
+static int iscsi_iser_task_xmit(struct iscsi_task *task)
+{
+ struct iscsi_conn *conn = task->conn;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ int error = 0;
+
+ if (!task->sc)
+ return iscsi_iser_mtask_xmit(conn, task);
+
+ if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
+ BUG_ON(scsi_bufflen(task->sc) == 0);
+
+ iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
+ task->itt, scsi_bufflen(task->sc),
+ task->imm_count, task->unsol_r2t.data_length);
+ }
+
+ iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
+ conn->id, task->itt);
+
+ /* Send the cmd PDU */
+ if (!iser_task->command_sent) {
+ error = iser_send_command(conn, task);
+ if (error)
+ goto iscsi_iser_task_xmit_exit;
+ iser_task->command_sent = 1;
+ }
+
+ /* Send unsolicited data-out PDU(s) if necessary */
+ if (iscsi_task_has_unsol_data(task))
+ error = iscsi_iser_task_xmit_unsol_data(conn, task);
+
+ iscsi_iser_task_xmit_exit:
+ return error;
+}
+
+/**
+ * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
+ * @task: iscsi task
+ *
+ * Notes: In case the RDMA device is already NULL (might have
+ * been removed in DEVICE_REMOVAL CM event it will bail-out
+ * without doing dma unmapping.
+ */
+static void iscsi_iser_cleanup_task(struct iscsi_task *task)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct iser_conn *iser_conn = task->conn->dd_data;
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ /* DEVICE_REMOVAL event might have already released the device */
+ if (!device)
+ return;
+
+ if (likely(tx_desc->mapped)) {
+ ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ tx_desc->mapped = false;
+ }
+
+ /* mgmt tasks do not need special cleanup */
+ if (!task->sc)
+ return;
+
+ if (iser_task->status == ISER_TASK_STATUS_STARTED) {
+ iser_task->status = ISER_TASK_STATUS_COMPLETED;
+ iser_task_rdma_finalize(iser_task);
+ }
+}
+
+/**
+ * iscsi_iser_check_protection() - check protection information status of task.
+ * @task: iscsi task
+ * @sector: error sector if exsists (output)
+ *
+ * Return: zero if no data-integrity errors have occured
+ * 0x1: data-integrity error occured in the guard-block
+ * 0x2: data-integrity error occured in the reference tag
+ * 0x3: data-integrity error occured in the application tag
+ *
+ * In addition the error sector is marked.
+ */
+static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ?
+ ISER_DIR_IN : ISER_DIR_OUT;
+
+ return iser_check_task_pi_status(iser_task, dir, sector);
+}
+
+/**
+ * iscsi_iser_conn_create() - create a new iscsi-iser connection
+ * @cls_session: iscsi class connection
+ * @conn_idx: connection index within the session (for MCS)
+ *
+ * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL
+ * otherwise.
+ */
+static struct iscsi_cls_conn *
+iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,
+ uint32_t conn_idx)
+{
+ struct iscsi_conn *conn;
+ struct iscsi_cls_conn *cls_conn;
+
+ cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+
+ /*
+ * due to issues with the login code re iser sematics
+ * this not set in iscsi_conn_setup - FIXME
+ */
+ conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
+
+ return cls_conn;
+}
+
+/**
+ * iscsi_iser_conn_bind() - bind iscsi and iser connection structures
+ * @cls_session: iscsi class session
+ * @cls_conn: iscsi class connection
+ * @transport_eph: transport end-point handle
+ * @is_leading: indicate if this is the session leading connection (MCS)
+ *
+ * Return: zero on success, $error if iscsi_conn_bind fails and
+ * -EINVAL in case end-point doesn't exists anymore or iser connection
+ * state is not UP (teardown already started).
+ */
+static int iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn,
+ uint64_t transport_eph, int is_leading)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iser_conn *iser_conn;
+ struct iscsi_endpoint *ep;
+ int error;
+
+ error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (error)
+ return error;
+
+ /* the transport ep handle comes from user space so it must be
+ * verified against the global ib connections list */
+ ep = iscsi_lookup_endpoint(transport_eph);
+ if (!ep) {
+ iser_err("can't bind eph %llx\n",
+ (unsigned long long)transport_eph);
+ return -EINVAL;
+ }
+ iser_conn = ep->dd_data;
+
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state != ISER_CONN_UP) {
+ error = -EINVAL;
+ iser_err("iser_conn %p state is %d, teardown started\n",
+ iser_conn, iser_conn->state);
+ goto out;
+ }
+
+ error = iser_alloc_rx_descriptors(iser_conn, conn->session);
+ if (error)
+ goto out;
+
+ /* binds the iSER connection retrieved from the previously
+ * connected ep_handle to the iSCSI layer connection. exchanges
+ * connection pointers */
+ iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
+
+ conn->dd_data = iser_conn;
+ iser_conn->iscsi_conn = conn;
+
+out:
+ iscsi_put_endpoint(ep);
+ mutex_unlock(&iser_conn->state_mutex);
+ return error;
+}
+
+/**
+ * iscsi_iser_conn_start() - start iscsi-iser connection
+ * @cls_conn: iscsi class connection
+ *
+ * Notes: Here iser intialize (or re-initialize) stop_completion as
+ * from this point iscsi must call conn_stop in session/connection
+ * teardown so iser transport must wait for it.
+ */
+static int iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
+{
+ struct iscsi_conn *iscsi_conn;
+ struct iser_conn *iser_conn;
+
+ iscsi_conn = cls_conn->dd_data;
+ iser_conn = iscsi_conn->dd_data;
+ reinit_completion(&iser_conn->stop_completion);
+
+ return iscsi_conn_start(cls_conn);
+}
+
+/**
+ * iscsi_iser_conn_stop() - stop iscsi-iser connection
+ * @cls_conn: iscsi class connection
+ * @flag: indicate if recover or terminate (passed as is)
+ *
+ * Notes: Calling iscsi_conn_stop might theoretically race with
+ * DEVICE_REMOVAL event and dereference a previously freed RDMA device
+ * handle, so we call it under iser the state lock to protect against
+ * this kind of race.
+ */
+static void iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iser_conn *iser_conn = conn->dd_data;
+
+ iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
+
+ /*
+ * Userspace may have goofed up and not bound the connection or
+ * might have only partially setup the connection.
+ */
+ if (iser_conn) {
+ mutex_lock(&iser_conn->state_mutex);
+ mutex_lock(&unbind_iser_conn_mutex);
+ iser_conn_terminate(iser_conn);
+ iscsi_conn_stop(cls_conn, flag);
+
+ /* unbind */
+ iser_conn->iscsi_conn = NULL;
+ conn->dd_data = NULL;
+ mutex_unlock(&unbind_iser_conn_mutex);
+
+ complete(&iser_conn->stop_completion);
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ iscsi_conn_stop(cls_conn, flag);
+ }
+}
+
+/**
+ * iscsi_iser_session_destroy() - destroy iscsi-iser session
+ * @cls_session: iscsi class session
+ *
+ * Removes and free iscsi host.
+ */
+static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+
+ iscsi_session_teardown(cls_session);
+ iscsi_host_remove(shost, false);
+ iscsi_host_free(shost);
+}
+
+static inline unsigned int iser_dif_prot_caps(int prot_caps)
+{
+ int ret = 0;
+
+ if (prot_caps & IB_PROT_T10DIF_TYPE_1)
+ ret |= SHOST_DIF_TYPE1_PROTECTION |
+ SHOST_DIX_TYPE0_PROTECTION |
+ SHOST_DIX_TYPE1_PROTECTION;
+ if (prot_caps & IB_PROT_T10DIF_TYPE_2)
+ ret |= SHOST_DIF_TYPE2_PROTECTION |
+ SHOST_DIX_TYPE2_PROTECTION;
+ if (prot_caps & IB_PROT_T10DIF_TYPE_3)
+ ret |= SHOST_DIF_TYPE3_PROTECTION |
+ SHOST_DIX_TYPE3_PROTECTION;
+
+ return ret;
+}
+
+/**
+ * iscsi_iser_session_create() - create an iscsi-iser session
+ * @ep: iscsi end-point handle
+ * @cmds_max: maximum commands in this session
+ * @qdepth: session command queue depth
+ * @initial_cmdsn: initiator command sequnce number
+ *
+ * Allocates and adds a scsi host, expose DIF supprot if
+ * exists, and sets up an iscsi session.
+ */
+static struct iscsi_cls_session *
+iscsi_iser_session_create(struct iscsi_endpoint *ep,
+ uint16_t cmds_max, uint16_t qdepth,
+ uint32_t initial_cmdsn)
+{
+ struct iscsi_cls_session *cls_session;
+ struct Scsi_Host *shost;
+ struct iser_conn *iser_conn = NULL;
+ struct ib_conn *ib_conn;
+ struct ib_device *ib_dev;
+ u32 max_fr_sectors;
+
+ shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
+ if (!shost)
+ return NULL;
+ shost->transportt = iscsi_iser_scsi_transport;
+ shost->cmd_per_lun = qdepth;
+ shost->max_lun = iscsi_max_lun;
+ shost->max_id = 0;
+ shost->max_channel = 0;
+ shost->max_cmd_len = 16;
+
+ /*
+ * older userspace tools (before 2.0-870) did not pass us
+ * the leading conn's ep so this will be NULL;
+ */
+ if (ep) {
+ iser_conn = ep->dd_data;
+ shost->sg_tablesize = iser_conn->scsi_sg_tablesize;
+ shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds);
+
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state != ISER_CONN_UP) {
+ iser_err("iser conn %p already started teardown\n",
+ iser_conn);
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+
+ ib_conn = &iser_conn->ib_conn;
+ ib_dev = ib_conn->device->ib_device;
+ if (ib_conn->pi_support) {
+ u32 sig_caps = ib_dev->attrs.sig_prot_cap;
+
+ shost->sg_prot_tablesize = shost->sg_tablesize;
+ scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
+ scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
+ SHOST_DIX_GUARD_CRC);
+ }
+
+ if (!(ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG))
+ shost->virt_boundary_mask = SZ_4K - 1;
+
+ if (iscsi_host_add(shost, ib_dev->dev.parent)) {
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX);
+ if (iscsi_host_add(shost, NULL))
+ goto free_host;
+ }
+
+ max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9;
+ shost->max_sectors = min(iser_max_sectors, max_fr_sectors);
+
+ iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n",
+ iser_conn, shost->sg_tablesize,
+ shost->max_sectors);
+
+ if (shost->max_sectors < iser_max_sectors)
+ iser_warn("max_sectors was reduced from %u to %u\n",
+ iser_max_sectors, shost->max_sectors);
+
+ cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
+ shost->can_queue, 0,
+ sizeof(struct iscsi_iser_task),
+ initial_cmdsn, 0);
+ if (!cls_session)
+ goto remove_host;
+
+ return cls_session;
+
+remove_host:
+ iscsi_host_remove(shost, false);
+free_host:
+ iscsi_host_free(shost);
+ return NULL;
+}
+
+static int iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf, int buflen)
+{
+ int value;
+
+ switch (param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ /* TBD */
+ break;
+ case ISCSI_PARAM_HDRDGST_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("DataDigest wasn't negotiated to None\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("DataDigest wasn't negotiated to None\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_IFMARKER_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("IFMarker wasn't negotiated to No\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_OFMARKER_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("OFMarker wasn't negotiated to No\n");
+ return -EPROTO;
+ }
+ break;
+ default:
+ return iscsi_set_param(cls_conn, param, buf, buflen);
+ }
+
+ return 0;
+}
+
+/**
+ * iscsi_iser_conn_get_stats() - get iscsi connection statistics
+ * @cls_conn: iscsi class connection
+ * @stats: iscsi stats to output
+ *
+ * Output connection statistics.
+ */
+static void iscsi_iser_conn_get_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; /* always 0 */
+ stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
+ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+ stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+ stats->custom_length = 0;
+}
+
+static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
+ enum iscsi_param param, char *buf)
+{
+ struct iser_conn *iser_conn = ep->dd_data;
+
+ switch (param) {
+ case ISCSI_PARAM_CONN_PORT:
+ case ISCSI_PARAM_CONN_ADDRESS:
+ if (!iser_conn || !iser_conn->ib_conn.cma_id)
+ return -ENOTCONN;
+
+ return iscsi_conn_get_addr_param((struct sockaddr_storage *)
+ &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
+ param, buf);
+ default:
+ break;
+ }
+ return -ENOSYS;
+}
+
+/**
+ * iscsi_iser_ep_connect() - Initiate iSER connection establishment
+ * @shost: scsi_host
+ * @dst_addr: destination address
+ * @non_blocking: indicate if routine can block
+ *
+ * Allocate an iscsi endpoint, an iser_conn structure and bind them.
+ * After that start RDMA connection establishment via rdma_cm. We
+ * don't allocate iser_conn embedded in iscsi_endpoint since in teardown
+ * the endpoint will be destroyed at ep_disconnect while iser_conn will
+ * cleanup its resources asynchronuously.
+ *
+ * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)
+ * if fails.
+ */
+static struct iscsi_endpoint *iscsi_iser_ep_connect(struct Scsi_Host *shost,
+ struct sockaddr *dst_addr,
+ int non_blocking)
+{
+ int err;
+ struct iser_conn *iser_conn;
+ struct iscsi_endpoint *ep;
+
+ ep = iscsi_create_endpoint(0);
+ if (!ep)
+ return ERR_PTR(-ENOMEM);
+
+ iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
+ if (!iser_conn) {
+ err = -ENOMEM;
+ goto failure;
+ }
+
+ ep->dd_data = iser_conn;
+ iser_conn->ep = ep;
+ iser_conn_init(iser_conn);
+
+ err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
+ if (err)
+ goto failure;
+
+ return ep;
+failure:
+ iscsi_destroy_endpoint(ep);
+ return ERR_PTR(err);
+}
+
+/**
+ * iscsi_iser_ep_poll() - poll for iser connection establishment to complete
+ * @ep: iscsi endpoint (created at ep_connect)
+ * @timeout_ms: polling timeout allowed in ms.
+ *
+ * This routine boils down to waiting for up_completion signaling
+ * that cma_id got CONNECTED event.
+ *
+ * Return: 1 if succeeded in connection establishment, 0 if timeout expired
+ * (libiscsi will retry will kick in) or -1 if interrupted by signal
+ * or more likely iser connection state transitioned to TEMINATING or
+ * DOWN during the wait period.
+ */
+static int iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
+{
+ struct iser_conn *iser_conn = ep->dd_data;
+ int rc;
+
+ rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
+ msecs_to_jiffies(timeout_ms));
+ /* if conn establishment failed, return error code to iscsi */
+ if (rc == 0) {
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state == ISER_CONN_TERMINATING ||
+ iser_conn->state == ISER_CONN_DOWN)
+ rc = -1;
+ mutex_unlock(&iser_conn->state_mutex);
+ }
+
+ iser_info("iser conn %p rc = %d\n", iser_conn, rc);
+
+ if (rc > 0)
+ return 1; /* success, this is the equivalent of EPOLLOUT */
+ else if (!rc)
+ return 0; /* timeout */
+ else
+ return rc; /* signal */
+}
+
+/**
+ * iscsi_iser_ep_disconnect() - Initiate connection teardown process
+ * @ep: iscsi endpoint handle
+ *
+ * This routine is not blocked by iser and RDMA termination process
+ * completion as we queue a deffered work for iser/RDMA destruction
+ * and cleanup or actually call it immediately in case we didn't pass
+ * iscsi conn bind/start stage, thus it is safe.
+ */
+static void iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
+{
+ struct iser_conn *iser_conn = ep->dd_data;
+
+ iser_info("ep %p iser conn %p\n", ep, iser_conn);
+
+ mutex_lock(&iser_conn->state_mutex);
+ iser_conn_terminate(iser_conn);
+
+ /*
+ * if iser_conn and iscsi_conn are bound, we must wait for
+ * iscsi_conn_stop and flush errors completion before freeing
+ * the iser resources. Otherwise we are safe to free resources
+ * immediately.
+ */
+ if (iser_conn->iscsi_conn) {
+ INIT_WORK(&iser_conn->release_work, iser_release_work);
+ queue_work(release_wq, &iser_conn->release_work);
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ iser_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&iser_conn->state_mutex);
+ iser_conn_release(iser_conn);
+ }
+
+ iscsi_destroy_endpoint(ep);
+}
+
+static umode_t iser_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_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_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:
+ case ISCSI_PARAM_DISCOVERY_SESS:
+ return S_IRUGO;
+ default:
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+static const struct scsi_host_template iscsi_iser_sht = {
+ .module = THIS_MODULE,
+ .name = "iSCSI Initiator over iSER",
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = scsi_change_queue_depth,
+ .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE,
+ .cmd_per_lun = ISER_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,
+ .proc_name = "iscsi_iser",
+ .this_id = -1,
+ .track_queue_depth = 1,
+ .cmd_size = sizeof(struct iscsi_cmd),
+};
+
+static struct iscsi_transport iscsi_iser_transport = {
+ .owner = THIS_MODULE,
+ .name = "iser",
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
+ /* session management */
+ .create_session = iscsi_iser_session_create,
+ .destroy_session = iscsi_iser_session_destroy,
+ /* connection management */
+ .create_conn = iscsi_iser_conn_create,
+ .bind_conn = iscsi_iser_conn_bind,
+ .unbind_conn = iscsi_conn_unbind,
+ .destroy_conn = iscsi_conn_teardown,
+ .attr_is_visible = iser_attr_is_visible,
+ .set_param = iscsi_iser_set_param,
+ .get_conn_param = iscsi_conn_get_param,
+ .get_ep_param = iscsi_iser_get_ep_param,
+ .get_session_param = iscsi_session_get_param,
+ .start_conn = iscsi_iser_conn_start,
+ .stop_conn = iscsi_iser_conn_stop,
+ /* iscsi host params */
+ .get_host_param = iscsi_host_get_param,
+ .set_host_param = iscsi_host_set_param,
+ /* IO */
+ .send_pdu = iscsi_conn_send_pdu,
+ .get_stats = iscsi_iser_conn_get_stats,
+ .init_task = iscsi_iser_task_init,
+ .xmit_task = iscsi_iser_task_xmit,
+ .cleanup_task = iscsi_iser_cleanup_task,
+ .alloc_pdu = iscsi_iser_pdu_alloc,
+ .check_protection = iscsi_iser_check_protection,
+ /* recovery */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
+
+ .ep_connect = iscsi_iser_ep_connect,
+ .ep_poll = iscsi_iser_ep_poll,
+ .ep_disconnect = iscsi_iser_ep_disconnect
+};
+
+static int __init iser_init(void)
+{
+ int err;
+
+ iser_dbg("Starting iSER datamover...\n");
+
+ memset(&ig, 0, sizeof(struct iser_global));
+
+ ig.desc_cache = kmem_cache_create("iser_descriptors",
+ sizeof(struct iser_tx_desc),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (ig.desc_cache == NULL)
+ return -ENOMEM;
+
+ /* device init is called only after the first addr resolution */
+ mutex_init(&ig.device_list_mutex);
+ INIT_LIST_HEAD(&ig.device_list);
+ mutex_init(&ig.connlist_mutex);
+ INIT_LIST_HEAD(&ig.connlist);
+
+ release_wq = alloc_workqueue("release workqueue", 0, 0);
+ if (!release_wq) {
+ iser_err("failed to allocate release workqueue\n");
+ err = -ENOMEM;
+ goto err_alloc_wq;
+ }
+
+ iscsi_iser_scsi_transport = iscsi_register_transport(
+ &iscsi_iser_transport);
+ if (!iscsi_iser_scsi_transport) {
+ iser_err("iscsi_register_transport failed\n");
+ err = -EINVAL;
+ goto err_reg;
+ }
+
+ return 0;
+
+err_reg:
+ destroy_workqueue(release_wq);
+err_alloc_wq:
+ kmem_cache_destroy(ig.desc_cache);
+
+ return err;
+}
+
+static void __exit iser_exit(void)
+{
+ struct iser_conn *iser_conn, *n;
+ int connlist_empty;
+
+ iser_dbg("Removing iSER datamover...\n");
+ destroy_workqueue(release_wq);
+
+ mutex_lock(&ig.connlist_mutex);
+ connlist_empty = list_empty(&ig.connlist);
+ mutex_unlock(&ig.connlist_mutex);
+
+ if (!connlist_empty) {
+ iser_err("Error cleanup stage completed but we still have iser "
+ "connections, destroying them anyway\n");
+ list_for_each_entry_safe(iser_conn, n, &ig.connlist,
+ conn_list) {
+ iser_conn_release(iser_conn);
+ }
+ }
+
+ iscsi_unregister_transport(&iscsi_iser_transport);
+ kmem_cache_destroy(ig.desc_cache);
+}
+
+module_init(iser_init);
+module_exit(iser_exit);
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
new file mode 100644
index 0000000000..d967d55324
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -0,0 +1,574 @@
+/*
+ * iSER transport for the Open iSCSI Initiator & iSER transport internals
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * based on code maintained by open-iscsi@googlegroups.com
+ *
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ISCSI_ISER_H__
+#define __ISCSI_ISER_H__
+
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/printk.h>
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/iser.h>
+
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/mutex.h>
+#include <linux/mempool.h>
+#include <linux/uio.h>
+
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+#define DRV_NAME "iser"
+#define PFX DRV_NAME ": "
+#define DRV_VER "1.6"
+
+#define iser_dbg(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 2)) \
+ printk(KERN_DEBUG PFX "%s: " fmt,\
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_warn(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 0)) \
+ pr_warn(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_info(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 1)) \
+ pr_info(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_err(fmt, arg...) \
+ pr_err(PFX "%s: " fmt, __func__ , ## arg)
+
+/* Default support is 512KB I/O size */
+#define ISER_DEF_MAX_SECTORS 1024
+#define ISCSI_ISER_DEF_SG_TABLESIZE \
+ ((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K))
+/* Maximum support is 16MB I/O size */
+#define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K))
+
+#define ISER_DEF_XMIT_CMDS_DEFAULT 512
+#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
+ #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX
+#else
+ #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT
+#endif
+#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
+
+#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
+ * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX)
+
+/* the max TX (send) WR supported by the iSER QP is defined by *
+ * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
+ * to have at max for SCSI command. The tx posting & completion handling code *
+ * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
+ * send WR. D=8 comes from 64K/8K */
+
+#define ISER_INFLIGHT_DATAOUTS 8
+
+#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
+ (1 + ISER_INFLIGHT_DATAOUTS) + \
+ ISER_MAX_TX_MISC_PDUS + \
+ ISER_MAX_RX_MISC_PDUS)
+
+/* Max registration work requests per command */
+#define ISER_MAX_REG_WR_PER_CMD 5
+
+/* For Signature we don't support DATAOUTs so no need to make room for them */
+#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
+ (1 + ISER_MAX_REG_WR_PER_CMD) + \
+ ISER_MAX_TX_MISC_PDUS + \
+ ISER_MAX_RX_MISC_PDUS)
+
+#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \
+ - ISER_MAX_TX_MISC_PDUS \
+ - ISER_MAX_RX_MISC_PDUS) / \
+ (1 + ISER_INFLIGHT_DATAOUTS))
+
+/* Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN 128
+#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
+#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* Length of an object name string */
+#define ISER_OBJECT_NAME_SIZE 64
+
+enum iser_conn_state {
+ ISER_CONN_INIT, /* descriptor allocd, no conn */
+ ISER_CONN_PENDING, /* in the process of being established */
+ ISER_CONN_UP, /* up and running */
+ ISER_CONN_TERMINATING, /* in the process of being terminated */
+ ISER_CONN_DOWN, /* shut down */
+ ISER_CONN_STATES_NUM
+};
+
+enum iser_task_status {
+ ISER_TASK_STATUS_INIT = 0,
+ ISER_TASK_STATUS_STARTED,
+ ISER_TASK_STATUS_COMPLETED
+};
+
+enum iser_data_dir {
+ ISER_DIR_IN = 0, /* to initiator */
+ ISER_DIR_OUT, /* from initiator */
+ ISER_DIRS_NUM
+};
+
+/**
+ * struct iser_data_buf - iSER data buffer
+ *
+ * @sg: pointer to the sg list
+ * @size: num entries of this sg
+ * @data_len: total beffer byte len
+ * @dma_nents: returned by dma_map_sg
+ */
+struct iser_data_buf {
+ struct scatterlist *sg;
+ int size;
+ unsigned long data_len;
+ int dma_nents;
+};
+
+/* fwd declarations */
+struct iser_device;
+struct iscsi_iser_task;
+struct iscsi_endpoint;
+struct iser_reg_resources;
+
+/**
+ * struct iser_mem_reg - iSER memory registration info
+ *
+ * @sge: memory region sg element
+ * @rkey: memory region remote key
+ * @desc: pointer to fast registration context
+ */
+struct iser_mem_reg {
+ struct ib_sge sge;
+ u32 rkey;
+ struct iser_fr_desc *desc;
+};
+
+enum iser_desc_type {
+ ISCSI_TX_CONTROL ,
+ ISCSI_TX_SCSI_COMMAND,
+ ISCSI_TX_DATAOUT
+};
+
+/**
+ * struct iser_tx_desc - iSER TX descriptor
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @type: command/control/dataout
+ * @dma_addr: header buffer dma_address
+ * @tx_sg: sg[0] points to iser/iscsi headers
+ * sg[1] optionally points to either of immediate data
+ * unsolicited data-out or control
+ * @num_sge: number sges used on this TX task
+ * @cqe: completion handler
+ * @mapped: Is the task header mapped
+ * @reg_wr: registration WR
+ * @send_wr: send WR
+ * @inv_wr: invalidate WR
+ */
+struct iser_tx_desc {
+ struct iser_ctrl iser_header;
+ struct iscsi_hdr iscsi_header;
+ enum iser_desc_type type;
+ u64 dma_addr;
+ struct ib_sge tx_sg[2];
+ int num_sge;
+ struct ib_cqe cqe;
+ bool mapped;
+ struct ib_reg_wr reg_wr;
+ struct ib_send_wr send_wr;
+ struct ib_send_wr inv_wr;
+};
+
+#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
+ sizeof(u64) + sizeof(struct ib_sge) + \
+ sizeof(struct ib_cqe)))
+/**
+ * struct iser_rx_desc - iSER RX descriptor
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @data: received data segment
+ * @dma_addr: receive buffer dma address
+ * @rx_sg: ib_sge of receive buffer
+ * @cqe: completion handler
+ * @pad: for sense data TODO: Modify to maximum sense length supported
+ */
+struct iser_rx_desc {
+ struct iser_ctrl iser_header;
+ struct iscsi_hdr iscsi_header;
+ char data[ISER_RECV_DATA_SEG_LEN];
+ u64 dma_addr;
+ struct ib_sge rx_sg;
+ struct ib_cqe cqe;
+ char pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+/**
+ * struct iser_login_desc - iSER login descriptor
+ *
+ * @req: pointer to login request buffer
+ * @rsp: pointer to login response buffer
+ * @req_dma: DMA address of login request buffer
+ * @rsp_dma: DMA address of login response buffer
+ * @sge: IB sge for login post recv
+ * @cqe: completion handler
+ */
+struct iser_login_desc {
+ void *req;
+ void *rsp;
+ u64 req_dma;
+ u64 rsp_dma;
+ struct ib_sge sge;
+ struct ib_cqe cqe;
+} __packed;
+
+struct iser_conn;
+struct ib_conn;
+
+/**
+ * struct iser_device - iSER device handle
+ *
+ * @ib_device: RDMA device
+ * @pd: Protection Domain for this device
+ * @mr: Global DMA memory region
+ * @event_handler: IB events handle routine
+ * @ig_list: entry in devices list
+ * @refcount: Reference counter, dominated by open iser connections
+ */
+struct iser_device {
+ struct ib_device *ib_device;
+ struct ib_pd *pd;
+ struct ib_event_handler event_handler;
+ struct list_head ig_list;
+ int refcount;
+};
+
+/**
+ * struct iser_reg_resources - Fast registration resources
+ *
+ * @mr: memory region
+ * @sig_mr: signature memory region
+ */
+struct iser_reg_resources {
+ struct ib_mr *mr;
+ struct ib_mr *sig_mr;
+};
+
+/**
+ * struct iser_fr_desc - Fast registration descriptor
+ *
+ * @list: entry in connection fastreg pool
+ * @rsc: data buffer registration resources
+ * @sig_protected: is region protected indicator
+ * @all_list: first and last list members
+ */
+struct iser_fr_desc {
+ struct list_head list;
+ struct iser_reg_resources rsc;
+ bool sig_protected;
+ struct list_head all_list;
+};
+
+/**
+ * struct iser_fr_pool - connection fast registration pool
+ *
+ * @list: list of fastreg descriptors
+ * @lock: protects fastreg pool
+ * @size: size of the pool
+ * @all_list: first and last list members
+ */
+struct iser_fr_pool {
+ struct list_head list;
+ spinlock_t lock;
+ int size;
+ struct list_head all_list;
+};
+
+/**
+ * struct ib_conn - Infiniband related objects
+ *
+ * @cma_id: rdma_cm connection maneger handle
+ * @qp: Connection Queue-pair
+ * @cq: Connection completion queue
+ * @cq_size: The number of max outstanding completions
+ * @device: reference to iser device
+ * @fr_pool: connection fast registration pool
+ * @pi_support: Indicate device T10-PI support
+ * @reg_cqe: completion handler
+ */
+struct ib_conn {
+ struct rdma_cm_id *cma_id;
+ struct ib_qp *qp;
+ struct ib_cq *cq;
+ u32 cq_size;
+ struct iser_device *device;
+ struct iser_fr_pool fr_pool;
+ bool pi_support;
+ struct ib_cqe reg_cqe;
+};
+
+/**
+ * struct iser_conn - iSER connection context
+ *
+ * @ib_conn: connection RDMA resources
+ * @iscsi_conn: link to matching iscsi connection
+ * @ep: transport handle
+ * @state: connection logical state
+ * @qp_max_recv_dtos: maximum number of data outs, corresponds
+ * to max number of post recvs
+ * @max_cmds: maximum cmds allowed for this connection
+ * @name: connection peer portal
+ * @release_work: deffered work for release job
+ * @state_mutex: protects iser onnection state
+ * @stop_completion: conn_stop completion
+ * @ib_completion: RDMA cleanup completion
+ * @up_completion: connection establishment completed
+ * (state is ISER_CONN_UP)
+ * @conn_list: entry in ig conn list
+ * @login_desc: login descriptor
+ * @rx_descs: rx buffers array (cyclic buffer)
+ * @num_rx_descs: number of rx descriptors
+ * @scsi_sg_tablesize: scsi host sg_tablesize
+ * @pages_per_mr: maximum pages available for registration
+ * @snd_w_inv: connection uses remote invalidation
+ */
+struct iser_conn {
+ struct ib_conn ib_conn;
+ struct iscsi_conn *iscsi_conn;
+ struct iscsi_endpoint *ep;
+ enum iser_conn_state state;
+ unsigned qp_max_recv_dtos;
+ u16 max_cmds;
+ char name[ISER_OBJECT_NAME_SIZE];
+ struct work_struct release_work;
+ struct mutex state_mutex;
+ struct completion stop_completion;
+ struct completion ib_completion;
+ struct completion up_completion;
+ struct list_head conn_list;
+ struct iser_login_desc login_desc;
+ struct iser_rx_desc *rx_descs;
+ u32 num_rx_descs;
+ unsigned short scsi_sg_tablesize;
+ unsigned short pages_per_mr;
+ bool snd_w_inv;
+};
+
+/**
+ * struct iscsi_iser_task - iser task context
+ *
+ * @desc: TX descriptor
+ * @iser_conn: link to iser connection
+ * @status: current task status
+ * @sc: link to scsi command
+ * @command_sent: indicate if command was sent
+ * @dir: iser data direction
+ * @rdma_reg: task rdma registration desc
+ * @data: iser data buffer desc
+ * @prot: iser protection buffer desc
+ */
+struct iscsi_iser_task {
+ struct iser_tx_desc desc;
+ struct iser_conn *iser_conn;
+ enum iser_task_status status;
+ struct scsi_cmnd *sc;
+ int command_sent;
+ int dir[ISER_DIRS_NUM];
+ struct iser_mem_reg rdma_reg[ISER_DIRS_NUM];
+ struct iser_data_buf data[ISER_DIRS_NUM];
+ struct iser_data_buf prot[ISER_DIRS_NUM];
+};
+
+/**
+ * struct iser_global - iSER global context
+ *
+ * @device_list_mutex: protects device_list
+ * @device_list: iser devices global list
+ * @connlist_mutex: protects connlist
+ * @connlist: iser connections global list
+ * @desc_cache: kmem cache for tx dataout
+ */
+struct iser_global {
+ struct mutex device_list_mutex;
+ struct list_head device_list;
+ struct mutex connlist_mutex;
+ struct list_head connlist;
+ struct kmem_cache *desc_cache;
+};
+
+extern struct iser_global ig;
+extern int iser_debug_level;
+extern bool iser_pi_enable;
+extern unsigned int iser_max_sectors;
+extern bool iser_always_reg;
+
+int iser_send_control(struct iscsi_conn *conn,
+ struct iscsi_task *task);
+
+int iser_send_command(struct iscsi_conn *conn,
+ struct iscsi_task *task);
+
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_task *task,
+ struct iscsi_data *hdr);
+
+void iscsi_iser_recv(struct iscsi_conn *conn,
+ struct iscsi_hdr *hdr,
+ char *rx_data,
+ int rx_data_len);
+
+void iser_conn_init(struct iser_conn *iser_conn);
+
+void iser_conn_release(struct iser_conn *iser_conn);
+
+int iser_conn_terminate(struct iser_conn *iser_conn);
+
+void iser_release_work(struct work_struct *work);
+
+void iser_err_comp(struct ib_wc *wc, const char *type);
+void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc);
+void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc);
+
+void iser_task_rdma_init(struct iscsi_iser_task *task);
+
+void iser_task_rdma_finalize(struct iscsi_iser_task *task);
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn);
+
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ enum iser_data_dir cmd_dir);
+
+int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
+ enum iser_data_dir dir,
+ bool all_imm);
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *task,
+ enum iser_data_dir dir);
+
+int iser_connect(struct iser_conn *iser_conn,
+ struct sockaddr *src_addr,
+ struct sockaddr *dst_addr,
+ int non_blocking);
+
+int iser_post_recvl(struct iser_conn *iser_conn);
+int iser_post_recvm(struct iser_conn *iser_conn,
+ struct iser_rx_desc *rx_desc);
+int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc);
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir);
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir);
+
+int iser_initialize_task_headers(struct iscsi_task *task,
+ struct iser_tx_desc *tx_desc);
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+ struct iscsi_session *session);
+int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
+ unsigned cmds_max,
+ unsigned int size);
+void iser_free_fastreg_pool(struct ib_conn *ib_conn);
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector);
+
+static inline struct iser_conn *
+to_iser_conn(struct ib_conn *ib_conn)
+{
+ return container_of(ib_conn, struct iser_conn, ib_conn);
+}
+
+static inline struct iser_rx_desc *
+iser_rx(struct ib_cqe *cqe)
+{
+ return container_of(cqe, struct iser_rx_desc, cqe);
+}
+
+static inline struct iser_tx_desc *
+iser_tx(struct ib_cqe *cqe)
+{
+ return container_of(cqe, struct iser_tx_desc, cqe);
+}
+
+static inline struct iser_login_desc *
+iser_login(struct ib_cqe *cqe)
+{
+ return container_of(cqe, struct iser_login_desc, cqe);
+}
+
+#endif
diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c
new file mode 100644
index 0000000000..f5f090dc4f
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_initiator.c
@@ -0,0 +1,747 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/kfifo.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include "iscsi_iser.h"
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_IN].data_len, Protection size
+ * os stored in task->prot[ISER_DIR_IN].data_len
+ */
+static int iser_prepare_read_cmd(struct iscsi_task *task)
+
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_ctrl *hdr = &iser_task->desc.iser_header;
+
+ err = iser_dma_map_task_data(iser_task,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+
+ err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);
+ if (err) {
+ iser_err("Failed to set up Data-IN RDMA\n");
+ goto out_err;
+ }
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
+
+ hdr->flags |= ISER_RSV;
+ hdr->read_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
+
+ iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr);
+
+ return 0;
+
+out_err:
+ iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE);
+ return err;
+}
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_OUT].data_len, Protection size
+ * is stored at task->prot[ISER_DIR_OUT].data_len
+ */
+static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz,
+ unsigned int unsol_sz, unsigned int edtl)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_ctrl *hdr = &iser_task->desc.iser_header;
+ struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
+ struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
+
+ err = iser_dma_map_task_data(iser_task,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+
+ err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,
+ buf_out->data_len == imm_sz);
+ if (err) {
+ iser_err("Failed to register write cmd RDMA mem\n");
+ goto out_err;
+ }
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+
+ if (unsol_sz < edtl) {
+ hdr->flags |= ISER_WSV;
+ if (buf_out->data_len > imm_sz) {
+ hdr->write_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
+ }
+
+ iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr, unsol_sz);
+ }
+
+ if (imm_sz > 0) {
+ iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
+ task->itt, imm_sz);
+ tx_dsg->addr = mem_reg->sge.addr;
+ tx_dsg->length = imm_sz;
+ tx_dsg->lkey = mem_reg->sge.lkey;
+ iser_task->desc.num_sge = 2;
+ }
+
+ return 0;
+
+out_err:
+ iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE);
+ return err;
+}
+
+/* creates a new tx descriptor and adds header regd buffer */
+static void iser_create_send_desc(struct iser_conn *iser_conn,
+ struct iser_tx_desc *tx_desc, enum iser_desc_type type,
+ void (*done)(struct ib_cq *cq, struct ib_wc *wc))
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ tx_desc->type = type;
+ tx_desc->cqe.done = done;
+
+ ib_dma_sync_single_for_cpu(device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
+ tx_desc->iser_header.flags = ISER_VER;
+ tx_desc->num_sge = 1;
+}
+
+static void iser_free_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+ struct iser_login_desc *desc = &iser_conn->login_desc;
+
+ if (!desc->req)
+ return;
+
+ ib_dma_unmap_single(device->ib_device, desc->req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
+
+ ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
+ ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
+
+ kfree(desc->req);
+ kfree(desc->rsp);
+
+ /* make sure we never redo any unmapping */
+ desc->req = NULL;
+ desc->rsp = NULL;
+}
+
+static int iser_alloc_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+ struct iser_login_desc *desc = &iser_conn->login_desc;
+
+ desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
+ if (!desc->req)
+ return -ENOMEM;
+
+ desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
+ ISCSI_DEF_MAX_RECV_SEG_LEN,
+ DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device,
+ desc->req_dma))
+ goto free_req;
+
+ desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
+ if (!desc->rsp)
+ goto unmap_req;
+
+ desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
+ ISER_RX_LOGIN_SIZE,
+ DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device,
+ desc->rsp_dma))
+ goto free_rsp;
+
+ return 0;
+
+free_rsp:
+ kfree(desc->rsp);
+unmap_req:
+ ib_dma_unmap_single(device->ib_device, desc->req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN,
+ DMA_TO_DEVICE);
+free_req:
+ kfree(desc->req);
+
+ return -ENOMEM;
+}
+
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+ struct iscsi_session *session)
+{
+ int i, j;
+ u64 dma_addr;
+ struct iser_rx_desc *rx_desc;
+ struct ib_sge *rx_sg;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_conn->qp_max_recv_dtos = session->cmds_max;
+
+ if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
+ iser_conn->pages_per_mr))
+ goto create_rdma_reg_res_failed;
+
+ if (iser_alloc_login_buf(iser_conn))
+ goto alloc_login_buf_fail;
+
+ iser_conn->num_rx_descs = session->cmds_max;
+ iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
+ sizeof(struct iser_rx_desc),
+ GFP_KERNEL);
+ if (!iser_conn->rx_descs)
+ goto rx_desc_alloc_fail;
+
+ rx_desc = iser_conn->rx_descs;
+
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
+ dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device, dma_addr))
+ goto rx_desc_dma_map_failed;
+
+ rx_desc->dma_addr = dma_addr;
+ rx_desc->cqe.done = iser_task_rsp;
+ rx_sg = &rx_desc->rx_sg;
+ rx_sg->addr = rx_desc->dma_addr;
+ rx_sg->length = ISER_RX_PAYLOAD_SIZE;
+ rx_sg->lkey = device->pd->local_dma_lkey;
+ }
+
+ return 0;
+
+rx_desc_dma_map_failed:
+ rx_desc = iser_conn->rx_descs;
+ for (j = 0; j < i; j++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ iser_conn->rx_descs = NULL;
+rx_desc_alloc_fail:
+ iser_free_login_buf(iser_conn);
+alloc_login_buf_fail:
+ iser_free_fastreg_pool(ib_conn);
+create_rdma_reg_res_failed:
+ iser_err("failed allocating rx descriptors / data buffers\n");
+ return -ENOMEM;
+}
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn)
+{
+ int i;
+ struct iser_rx_desc *rx_desc;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_free_fastreg_pool(ib_conn);
+
+ rx_desc = iser_conn->rx_descs;
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ /* make sure we never redo any unmapping */
+ iser_conn->rx_descs = NULL;
+
+ iser_free_login_buf(iser_conn);
+}
+
+static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_session *session = conn->session;
+ int err = 0;
+ int i;
+
+ iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
+ /* check if this is the last login - going to full feature phase */
+ if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
+ goto out;
+
+ if (session->discovery_sess) {
+ iser_info("Discovery session, re-using login RX buffer\n");
+ goto out;
+ }
+
+ iser_info("Normal session, posting batch of RX %d buffers\n",
+ iser_conn->qp_max_recv_dtos - 1);
+
+ /*
+ * Initial post receive buffers.
+ * There is one already posted recv buffer (for the last login
+ * response). Therefore, the first recv buffer is skipped here.
+ */
+ for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
+ err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
+ if (err)
+ goto out;
+ }
+out:
+ return err;
+}
+
+/**
+ * iser_send_command - send command PDU
+ * @conn: link to matching iscsi connection
+ * @task: SCSI command task
+ */
+int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ unsigned long edtl;
+ int err;
+ struct iser_data_buf *data_buf, *prot_buf;
+ struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
+ struct scsi_cmnd *sc = task->sc;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+
+ edtl = ntohl(hdr->data_length);
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND,
+ iser_cmd_comp);
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ data_buf = &iser_task->data[ISER_DIR_IN];
+ prot_buf = &iser_task->prot[ISER_DIR_IN];
+ } else {
+ data_buf = &iser_task->data[ISER_DIR_OUT];
+ prot_buf = &iser_task->prot[ISER_DIR_OUT];
+ }
+
+ if (scsi_sg_count(sc)) { /* using a scatter list */
+ data_buf->sg = scsi_sglist(sc);
+ data_buf->size = scsi_sg_count(sc);
+ }
+ data_buf->data_len = scsi_bufflen(sc);
+
+ if (scsi_prot_sg_count(sc)) {
+ prot_buf->sg = scsi_prot_sglist(sc);
+ prot_buf->size = scsi_prot_sg_count(sc);
+ prot_buf->data_len = (data_buf->data_len >>
+ ilog2(sc->device->sector_size)) * 8;
+ }
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ err = iser_prepare_read_cmd(task);
+ if (err)
+ goto send_command_error;
+ }
+ if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
+ err = iser_prepare_write_cmd(task,
+ task->imm_count,
+ task->imm_count +
+ task->unsol_r2t.data_length,
+ edtl);
+ if (err)
+ goto send_command_error;
+ }
+
+ iser_task->status = ISER_TASK_STATUS_STARTED;
+
+ err = iser_post_send(&iser_conn->ib_conn, tx_desc);
+ if (!err)
+ return 0;
+
+send_command_error:
+ iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
+ return err;
+}
+
+/**
+ * iser_send_data_out - send data out PDU
+ * @conn: link to matching iscsi connection
+ * @task: SCSI command task
+ * @hdr: pointer to the LLD's iSCSI message header
+ */
+int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
+ struct iscsi_data *hdr)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *tx_desc;
+ struct iser_mem_reg *mem_reg;
+ unsigned long buf_offset;
+ unsigned long data_seg_len;
+ uint32_t itt;
+ int err;
+ struct ib_sge *tx_dsg;
+
+ itt = (__force uint32_t)hdr->itt;
+ data_seg_len = ntoh24(hdr->dlength);
+ buf_offset = ntohl(hdr->offset);
+
+ iser_dbg("%s itt %d dseg_len %d offset %d\n",
+ __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
+
+ tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
+ if (!tx_desc)
+ return -ENOMEM;
+
+ tx_desc->type = ISCSI_TX_DATAOUT;
+ tx_desc->cqe.done = iser_dataout_comp;
+ tx_desc->iser_header.flags = ISER_VER;
+ memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
+
+ /* build the tx desc */
+ err = iser_initialize_task_headers(task, tx_desc);
+ if (err)
+ goto send_data_out_error;
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+ tx_dsg = &tx_desc->tx_sg[1];
+ tx_dsg->addr = mem_reg->sge.addr + buf_offset;
+ tx_dsg->length = data_seg_len;
+ tx_dsg->lkey = mem_reg->sge.lkey;
+ tx_desc->num_sge = 2;
+
+ if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
+ iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
+ buf_offset, data_seg_len,
+ iser_task->data[ISER_DIR_OUT].data_len, itt);
+ err = -EINVAL;
+ goto send_data_out_error;
+ }
+ iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
+ itt, buf_offset, data_seg_len);
+
+ err = iser_post_send(&iser_conn->ib_conn, tx_desc);
+ if (!err)
+ return 0;
+
+send_data_out_error:
+ kmem_cache_free(ig.desc_cache, tx_desc);
+ iser_err("conn %p failed err %d\n", conn, err);
+ return err;
+}
+
+int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *mdesc = &iser_task->desc;
+ unsigned long data_seg_len;
+ int err = 0;
+ struct iser_device *device;
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL,
+ iser_ctrl_comp);
+
+ device = iser_conn->ib_conn.device;
+
+ data_seg_len = ntoh24(task->hdr->dlength);
+
+ if (data_seg_len > 0) {
+ struct iser_login_desc *desc = &iser_conn->login_desc;
+ struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
+
+ if (task != conn->login_task) {
+ iser_err("data present on non login task!!!\n");
+ goto send_control_error;
+ }
+
+ ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
+ task->data_count, DMA_TO_DEVICE);
+
+ memcpy(desc->req, task->data, task->data_count);
+
+ ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
+ task->data_count, DMA_TO_DEVICE);
+
+ tx_dsg->addr = desc->req_dma;
+ tx_dsg->length = task->data_count;
+ tx_dsg->lkey = device->pd->local_dma_lkey;
+ mdesc->num_sge = 2;
+ }
+
+ if (task == conn->login_task) {
+ iser_dbg("op %x dsl %lx, posting login rx buffer\n",
+ task->hdr->opcode, data_seg_len);
+ err = iser_post_recvl(iser_conn);
+ if (err)
+ goto send_control_error;
+ err = iser_post_rx_bufs(conn, task->hdr);
+ if (err)
+ goto send_control_error;
+ }
+
+ err = iser_post_send(&iser_conn->ib_conn, mdesc);
+ if (!err)
+ return 0;
+
+send_control_error:
+ iser_err("conn %p failed err %d\n",conn, err);
+ return err;
+}
+
+void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ib_conn *ib_conn = wc->qp->qp_context;
+ struct iser_conn *iser_conn = to_iser_conn(ib_conn);
+ struct iser_login_desc *desc = iser_login(wc->wr_cqe);
+ struct iscsi_hdr *hdr;
+ char *data;
+ int length;
+ bool full_feature_phase;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ iser_err_comp(wc, "login_rsp");
+ return;
+ }
+
+ ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
+ desc->rsp_dma, ISER_RX_LOGIN_SIZE,
+ DMA_FROM_DEVICE);
+
+ hdr = desc->rsp + sizeof(struct iser_ctrl);
+ data = desc->rsp + ISER_HEADERS_LEN;
+ length = wc->byte_len - ISER_HEADERS_LEN;
+ full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==
+ ISCSI_FULL_FEATURE_PHASE) &&
+ (hdr->flags & ISCSI_FLAG_CMD_FINAL);
+
+ iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
+ hdr->itt, length);
+
+ iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
+
+ ib_dma_sync_single_for_device(ib_conn->device->ib_device,
+ desc->rsp_dma, ISER_RX_LOGIN_SIZE,
+ DMA_FROM_DEVICE);
+
+ if (!full_feature_phase ||
+ iser_conn->iscsi_conn->session->discovery_sess)
+ return;
+
+ /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */
+ iser_post_recvm(iser_conn, iser_conn->rx_descs);
+}
+
+static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
+{
+ if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
+ (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
+ iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
+ return -EINVAL;
+ }
+
+ if (desc->sig_protected)
+ desc->rsc.sig_mr->need_inval = false;
+ else
+ desc->rsc.mr->need_inval = false;
+
+ return 0;
+}
+
+static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
+ struct iscsi_hdr *hdr)
+{
+ if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
+ struct iscsi_task *task;
+ u32 rkey = wc->ex.invalidate_rkey;
+
+ iser_dbg("conn %p: remote invalidation for rkey %#x\n",
+ iser_conn, rkey);
+
+ if (unlikely(!iser_conn->snd_w_inv)) {
+ iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
+ iser_conn);
+ return -EPROTO;
+ }
+
+ task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
+ if (likely(task)) {
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_fr_desc *desc;
+
+ if (iser_task->dir[ISER_DIR_IN]) {
+ desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
+ if (unlikely(iser_inv_desc(desc, rkey)))
+ return -EINVAL;
+ }
+
+ if (iser_task->dir[ISER_DIR_OUT]) {
+ desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
+ if (unlikely(iser_inv_desc(desc, rkey)))
+ return -EINVAL;
+ }
+ } else {
+ iser_err("failed to get task for itt=%d\n", hdr->itt);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+
+void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ib_conn *ib_conn = wc->qp->qp_context;
+ struct iser_conn *iser_conn = to_iser_conn(ib_conn);
+ struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
+ struct iscsi_hdr *hdr;
+ int length, err;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ iser_err_comp(wc, "task_rsp");
+ return;
+ }
+
+ ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
+ desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
+ DMA_FROM_DEVICE);
+
+ hdr = &desc->iscsi_header;
+ length = wc->byte_len - ISER_HEADERS_LEN;
+
+ iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
+ hdr->itt, length);
+
+ if (iser_check_remote_inv(iser_conn, wc, hdr)) {
+ iscsi_conn_failure(iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+ return;
+ }
+
+ iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
+
+ ib_dma_sync_single_for_device(ib_conn->device->ib_device,
+ desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
+ DMA_FROM_DEVICE);
+
+ err = iser_post_recvm(iser_conn, desc);
+ if (err)
+ iser_err("posting rx buffer err %d\n", err);
+}
+
+void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ iser_err_comp(wc, "command");
+}
+
+void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
+ struct iscsi_task *task;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ iser_err_comp(wc, "control");
+ return;
+ }
+
+ /* this arithmetic is legal by libiscsi dd_data allocation */
+ task = (void *)desc - sizeof(struct iscsi_task);
+ if (task->hdr->itt == RESERVED_ITT)
+ iscsi_put_task(task);
+}
+
+void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
+ struct ib_conn *ib_conn = wc->qp->qp_context;
+ struct iser_device *device = ib_conn->device;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ iser_err_comp(wc, "dataout");
+
+ ib_dma_unmap_single(device->ib_device, desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ kmem_cache_free(ig.desc_cache, desc);
+}
+
+void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
+
+{
+ iser_task->status = ISER_TASK_STATUS_INIT;
+
+ iser_task->dir[ISER_DIR_IN] = 0;
+ iser_task->dir[ISER_DIR_OUT] = 0;
+
+ iser_task->data[ISER_DIR_IN].data_len = 0;
+ iser_task->data[ISER_DIR_OUT].data_len = 0;
+
+ iser_task->prot[ISER_DIR_IN].data_len = 0;
+ iser_task->prot[ISER_DIR_OUT].data_len = 0;
+
+ iser_task->prot[ISER_DIR_IN].dma_nents = 0;
+ iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
+
+ memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
+ sizeof(struct iser_mem_reg));
+ memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
+ sizeof(struct iser_mem_reg));
+}
+
+void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
+{
+
+ if (iser_task->dir[ISER_DIR_IN]) {
+ iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
+ iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ }
+
+ if (iser_task->dir[ISER_DIR_OUT]) {
+ iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
+ iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ }
+}
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
new file mode 100644
index 0000000000..6efcb79c8e
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,391 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+
+#include "iscsi_iser.h"
+
+void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
+{
+ iser_err_comp(wc, "memreg");
+}
+
+static struct iser_fr_desc *iser_reg_desc_get_fr(struct ib_conn *ib_conn)
+{
+ struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+ struct iser_fr_desc *desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fr_pool->lock, flags);
+ desc = list_first_entry(&fr_pool->list,
+ struct iser_fr_desc, list);
+ list_del(&desc->list);
+ spin_unlock_irqrestore(&fr_pool->lock, flags);
+
+ return desc;
+}
+
+static void iser_reg_desc_put_fr(struct ib_conn *ib_conn,
+ struct iser_fr_desc *desc)
+{
+ struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fr_pool->lock, flags);
+ list_add(&desc->list, &fr_pool->list);
+ spin_unlock_irqrestore(&fr_pool->lock, flags);
+}
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct iser_data_buf *data = &iser_task->data[iser_dir];
+ struct ib_device *dev;
+
+ iser_task->dir[iser_dir] = 1;
+ dev = iser_task->iser_conn->ib_conn.device->ib_device;
+
+ data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
+ if (unlikely(data->dma_nents == 0)) {
+ iser_err("dma_map_sg failed!!!\n");
+ return -EINVAL;
+ }
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
+
+ pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir);
+ if (unlikely(pdata->dma_nents == 0)) {
+ iser_err("protection dma_map_sg failed!!!\n");
+ goto out_unmap;
+ }
+ }
+
+ return 0;
+
+out_unmap:
+ ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
+ return -EINVAL;
+}
+
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct iser_data_buf *data = &iser_task->data[iser_dir];
+ struct ib_device *dev;
+
+ dev = iser_task->iser_conn->ib_conn.device->ib_device;
+ ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
+
+ ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_dir);
+ }
+}
+
+static int iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
+ struct iser_mem_reg *reg)
+{
+ struct scatterlist *sg = mem->sg;
+
+ reg->sge.lkey = device->pd->local_dma_lkey;
+ /*
+ * FIXME: rework the registration code path to differentiate
+ * rkey/lkey use cases
+ */
+
+ if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
+ reg->rkey = device->pd->unsafe_global_rkey;
+ else
+ reg->rkey = 0;
+ reg->sge.addr = sg_dma_address(&sg[0]);
+ reg->sge.length = sg_dma_len(&sg[0]);
+
+ iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
+ " length=0x%x\n", reg->sge.lkey, reg->rkey,
+ reg->sge.addr, reg->sge.length);
+
+ return 0;
+}
+
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+ struct iser_fr_desc *desc;
+ struct ib_mr_status mr_status;
+
+ desc = reg->desc;
+ if (!desc)
+ return;
+
+ /*
+ * The signature MR cannot be invalidated and reused without checking.
+ * libiscsi calls the check_protection transport handler only if
+ * SCSI-Response is received. And the signature MR is not checked if
+ * the task is completed for some other reason like a timeout or error
+ * handling. That's why we must check the signature MR here before
+ * putting it to the free pool.
+ */
+ if (unlikely(desc->sig_protected)) {
+ desc->sig_protected = false;
+ ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS,
+ &mr_status);
+ }
+ iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc);
+ reg->desc = NULL;
+}
+
+static void iser_set_dif_domain(struct scsi_cmnd *sc,
+ struct ib_sig_domain *domain)
+{
+ domain->sig_type = IB_SIG_TYPE_T10_DIF;
+ domain->sig.dif.pi_interval = scsi_prot_interval(sc);
+ domain->sig.dif.ref_tag = t10_pi_ref_tag(scsi_cmd_to_rq(sc));
+ /*
+ * At the moment we hard code those, but in the future
+ * we will take them from sc.
+ */
+ domain->sig.dif.apptag_check_mask = 0xffff;
+ domain->sig.dif.app_escape = true;
+ domain->sig.dif.ref_escape = true;
+ if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
+ domain->sig.dif.ref_remap = true;
+}
+
+static int iser_set_sig_attrs(struct scsi_cmnd *sc,
+ struct ib_sig_attrs *sig_attrs)
+{
+ switch (scsi_get_prot_op(sc)) {
+ case SCSI_PROT_WRITE_INSERT:
+ case SCSI_PROT_READ_STRIP:
+ sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
+ iser_set_dif_domain(sc, &sig_attrs->wire);
+ sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+ break;
+ case SCSI_PROT_READ_INSERT:
+ case SCSI_PROT_WRITE_STRIP:
+ sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
+ iser_set_dif_domain(sc, &sig_attrs->mem);
+ sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+ IB_T10DIF_CSUM : IB_T10DIF_CRC;
+ break;
+ case SCSI_PROT_READ_PASS:
+ case SCSI_PROT_WRITE_PASS:
+ iser_set_dif_domain(sc, &sig_attrs->wire);
+ sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+ iser_set_dif_domain(sc, &sig_attrs->mem);
+ sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+ IB_T10DIF_CSUM : IB_T10DIF_CRC;
+ break;
+ default:
+ iser_err("Unsupported PI operation %d\n",
+ scsi_get_prot_op(sc));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline void iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
+{
+ *mask = 0;
+ if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+ *mask |= IB_SIG_CHECK_REFTAG;
+ if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+ *mask |= IB_SIG_CHECK_GUARD;
+}
+
+static inline void iser_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr,
+ struct ib_cqe *cqe, struct ib_send_wr *next_wr)
+{
+ inv_wr->opcode = IB_WR_LOCAL_INV;
+ inv_wr->wr_cqe = cqe;
+ inv_wr->ex.invalidate_rkey = mr->rkey;
+ inv_wr->send_flags = 0;
+ inv_wr->num_sge = 0;
+ inv_wr->next = next_wr;
+}
+
+static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ struct iser_data_buf *sig_mem,
+ struct iser_reg_resources *rsc,
+ struct iser_mem_reg *sig_reg)
+{
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
+ struct ib_mr *mr = rsc->sig_mr;
+ struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
+ struct ib_reg_wr *wr = &tx_desc->reg_wr;
+ int ret;
+
+ memset(sig_attrs, 0, sizeof(*sig_attrs));
+ ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
+ if (ret)
+ goto err;
+
+ iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
+
+ if (rsc->sig_mr->need_inval)
+ iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
+
+ ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+ ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
+ sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
+ if (unlikely(ret)) {
+ iser_err("failed to map PI sg (%d)\n",
+ mem->dma_nents + sig_mem->dma_nents);
+ goto err;
+ }
+
+ memset(wr, 0, sizeof(*wr));
+ wr->wr.next = &tx_desc->send_wr;
+ wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
+ wr->wr.wr_cqe = cqe;
+ wr->wr.num_sge = 0;
+ wr->wr.send_flags = 0;
+ wr->mr = mr;
+ wr->key = mr->rkey;
+ wr->access = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE;
+ rsc->sig_mr->need_inval = true;
+
+ sig_reg->sge.lkey = mr->lkey;
+ sig_reg->rkey = mr->rkey;
+ sig_reg->sge.addr = mr->iova;
+ sig_reg->sge.length = mr->length;
+
+ iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
+ sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
+ sig_reg->sge.length);
+err:
+ return ret;
+}
+
+static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ struct iser_reg_resources *rsc,
+ struct iser_mem_reg *reg)
+{
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
+ struct ib_mr *mr = rsc->mr;
+ struct ib_reg_wr *wr = &tx_desc->reg_wr;
+ int n;
+
+ if (rsc->mr->need_inval)
+ iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
+
+ ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
+
+ n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SZ_4K);
+ if (unlikely(n != mem->dma_nents)) {
+ iser_err("failed to map sg (%d/%d)\n",
+ n, mem->dma_nents);
+ return n < 0 ? n : -EINVAL;
+ }
+
+ wr->wr.next = &tx_desc->send_wr;
+ wr->wr.opcode = IB_WR_REG_MR;
+ wr->wr.wr_cqe = cqe;
+ wr->wr.send_flags = 0;
+ wr->wr.num_sge = 0;
+ wr->mr = mr;
+ wr->key = mr->rkey;
+ wr->access = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ;
+
+ rsc->mr->need_inval = true;
+
+ reg->sge.lkey = mr->lkey;
+ reg->rkey = mr->rkey;
+ reg->sge.addr = mr->iova;
+ reg->sge.length = mr->length;
+
+ iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
+ reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
+
+ return 0;
+}
+
+int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
+ enum iser_data_dir dir,
+ bool all_imm)
+{
+ struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+ struct iser_data_buf *mem = &task->data[dir];
+ struct iser_mem_reg *reg = &task->rdma_reg[dir];
+ struct iser_fr_desc *desc;
+ bool use_dma_key;
+ int err;
+
+ use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
+ scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
+ if (use_dma_key)
+ return iser_reg_dma(device, mem, reg);
+
+ desc = iser_reg_desc_get_fr(ib_conn);
+ if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
+ err = iser_fast_reg_mr(task, mem, &desc->rsc, reg);
+ if (unlikely(err))
+ goto err_reg;
+ } else {
+ err = iser_reg_sig_mr(task, mem, &task->prot[dir],
+ &desc->rsc, reg);
+ if (unlikely(err))
+ goto err_reg;
+
+ desc->sig_protected = true;
+ }
+
+ reg->desc = desc;
+
+ return 0;
+
+err_reg:
+ iser_reg_desc_put_fr(ib_conn, desc);
+
+ return err;
+}
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
new file mode 100644
index 0000000000..6801b70dc9
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -0,0 +1,952 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include "iscsi_iser.h"
+
+static void iser_qp_event_callback(struct ib_event *cause, void *context)
+{
+ iser_err("qp event %s (%d)\n",
+ ib_event_msg(cause->event), cause->event);
+}
+
+static void iser_event_handler(struct ib_event_handler *handler,
+ struct ib_event *event)
+{
+ iser_err("async event %s (%d) on device %s port %d\n",
+ ib_event_msg(event->event), event->event,
+ dev_name(&event->device->dev), event->element.port_num);
+}
+
+/*
+ * iser_create_device_ib_res - creates Protection Domain (PD), Completion
+ * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
+ * the adaptor.
+ *
+ * Return: 0 on success, -1 on failure
+ */
+static int iser_create_device_ib_res(struct iser_device *device)
+{
+ struct ib_device *ib_dev = device->ib_device;
+
+ if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) {
+ iser_err("IB device does not support memory registrations\n");
+ return -1;
+ }
+
+ device->pd = ib_alloc_pd(ib_dev,
+ iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
+ if (IS_ERR(device->pd))
+ goto pd_err;
+
+ INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev,
+ iser_event_handler);
+ ib_register_event_handler(&device->event_handler);
+ return 0;
+
+pd_err:
+ iser_err("failed to allocate an IB resource\n");
+ return -1;
+}
+
+/*
+ * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
+ * CQ and PD created with the device associated with the adaptor.
+ */
+static void iser_free_device_ib_res(struct iser_device *device)
+{
+ ib_unregister_event_handler(&device->event_handler);
+ ib_dealloc_pd(device->pd);
+
+ device->pd = NULL;
+}
+
+static struct iser_fr_desc *
+iser_create_fastreg_desc(struct iser_device *device,
+ struct ib_pd *pd,
+ bool pi_enable,
+ unsigned int size)
+{
+ struct iser_fr_desc *desc;
+ struct ib_device *ib_dev = device->ib_device;
+ enum ib_mr_type mr_type;
+ int ret;
+
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return ERR_PTR(-ENOMEM);
+
+ if (ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)
+ mr_type = IB_MR_TYPE_SG_GAPS;
+ else
+ mr_type = IB_MR_TYPE_MEM_REG;
+
+ desc->rsc.mr = ib_alloc_mr(pd, mr_type, size);
+ if (IS_ERR(desc->rsc.mr)) {
+ ret = PTR_ERR(desc->rsc.mr);
+ iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
+ goto err_alloc_mr;
+ }
+
+ if (pi_enable) {
+ desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size);
+ if (IS_ERR(desc->rsc.sig_mr)) {
+ ret = PTR_ERR(desc->rsc.sig_mr);
+ iser_err("Failed to allocate sig_mr err=%d\n", ret);
+ goto err_alloc_mr_integrity;
+ }
+ }
+
+ return desc;
+
+err_alloc_mr_integrity:
+ ib_dereg_mr(desc->rsc.mr);
+err_alloc_mr:
+ kfree(desc);
+
+ return ERR_PTR(ret);
+}
+
+static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc)
+{
+ struct iser_reg_resources *res = &desc->rsc;
+
+ ib_dereg_mr(res->mr);
+ if (res->sig_mr) {
+ ib_dereg_mr(res->sig_mr);
+ res->sig_mr = NULL;
+ }
+ kfree(desc);
+}
+
+/**
+ * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors
+ * for fast registration work requests.
+ * @ib_conn: connection RDMA resources
+ * @cmds_max: max number of SCSI commands for this connection
+ * @size: max number of pages per map request
+ *
+ * Return: 0 on success, or errno code on failure
+ */
+int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
+ unsigned cmds_max,
+ unsigned int size)
+{
+ struct iser_device *device = ib_conn->device;
+ struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+ struct iser_fr_desc *desc;
+ int i, ret;
+
+ INIT_LIST_HEAD(&fr_pool->list);
+ INIT_LIST_HEAD(&fr_pool->all_list);
+ spin_lock_init(&fr_pool->lock);
+ fr_pool->size = 0;
+ for (i = 0; i < cmds_max; i++) {
+ desc = iser_create_fastreg_desc(device, device->pd,
+ ib_conn->pi_support, size);
+ if (IS_ERR(desc)) {
+ ret = PTR_ERR(desc);
+ goto err;
+ }
+
+ list_add_tail(&desc->list, &fr_pool->list);
+ list_add_tail(&desc->all_list, &fr_pool->all_list);
+ fr_pool->size++;
+ }
+
+ return 0;
+
+err:
+ iser_free_fastreg_pool(ib_conn);
+ return ret;
+}
+
+/**
+ * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
+ * @ib_conn: connection RDMA resources
+ */
+void iser_free_fastreg_pool(struct ib_conn *ib_conn)
+{
+ struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
+ struct iser_fr_desc *desc, *tmp;
+ int i = 0;
+
+ if (list_empty(&fr_pool->all_list))
+ return;
+
+ iser_info("freeing conn %p fr pool\n", ib_conn);
+
+ list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {
+ list_del(&desc->all_list);
+ iser_destroy_fastreg_desc(desc);
+ ++i;
+ }
+
+ if (i < fr_pool->size)
+ iser_warn("pool still has %d regions registered\n",
+ fr_pool->size - i);
+}
+
+/*
+ * iser_create_ib_conn_res - Queue-Pair (QP)
+ *
+ * Return: 0 on success, -1 on failure
+ */
+static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
+{
+ struct iser_conn *iser_conn = to_iser_conn(ib_conn);
+ struct iser_device *device;
+ struct ib_device *ib_dev;
+ struct ib_qp_init_attr init_attr;
+ int ret = -ENOMEM;
+ unsigned int max_send_wr, cq_size;
+
+ BUG_ON(ib_conn->device == NULL);
+
+ device = ib_conn->device;
+ ib_dev = device->ib_device;
+
+ /* +1 for drain */
+ if (ib_conn->pi_support)
+ max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
+ else
+ max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
+ max_send_wr = min_t(unsigned int, max_send_wr,
+ (unsigned int)ib_dev->attrs.max_qp_wr);
+
+ cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS;
+ ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ);
+ if (IS_ERR(ib_conn->cq)) {
+ ret = PTR_ERR(ib_conn->cq);
+ goto cq_err;
+ }
+ ib_conn->cq_size = cq_size;
+
+ memset(&init_attr, 0, sizeof(init_attr));
+
+ init_attr.event_handler = iser_qp_event_callback;
+ init_attr.qp_context = (void *)ib_conn;
+ init_attr.send_cq = ib_conn->cq;
+ init_attr.recv_cq = ib_conn->cq;
+ /* +1 for drain */
+ init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS + 1;
+ init_attr.cap.max_send_sge = 2;
+ init_attr.cap.max_recv_sge = 1;
+ init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ init_attr.qp_type = IB_QPT_RC;
+ init_attr.cap.max_send_wr = max_send_wr;
+ if (ib_conn->pi_support)
+ init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
+ iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1);
+
+ ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
+ if (ret)
+ goto out_err;
+
+ ib_conn->qp = ib_conn->cma_id->qp;
+ iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", ib_conn,
+ ib_conn->cma_id, ib_conn->cma_id->qp, max_send_wr);
+ return ret;
+
+out_err:
+ ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);
+cq_err:
+ iser_err("unable to alloc mem or create resource, err %d\n", ret);
+
+ return ret;
+}
+
+/*
+ * based on the resolved device node GUID see if there already allocated
+ * device for this device. If there's no such, create one.
+ */
+static
+struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
+{
+ struct iser_device *device;
+
+ mutex_lock(&ig.device_list_mutex);
+
+ list_for_each_entry(device, &ig.device_list, ig_list)
+ /* find if there's a match using the node GUID */
+ if (device->ib_device->node_guid == cma_id->device->node_guid)
+ goto inc_refcnt;
+
+ device = kzalloc(sizeof *device, GFP_KERNEL);
+ if (!device)
+ goto out;
+
+ /* assign this device to the device */
+ device->ib_device = cma_id->device;
+ /* init the device and link it into ig device list */
+ if (iser_create_device_ib_res(device)) {
+ kfree(device);
+ device = NULL;
+ goto out;
+ }
+ list_add(&device->ig_list, &ig.device_list);
+
+inc_refcnt:
+ device->refcount++;
+out:
+ mutex_unlock(&ig.device_list_mutex);
+ return device;
+}
+
+/* if there's no demand for this device, release it */
+static void iser_device_try_release(struct iser_device *device)
+{
+ mutex_lock(&ig.device_list_mutex);
+ device->refcount--;
+ iser_info("device %p refcount %d\n", device, device->refcount);
+ if (!device->refcount) {
+ iser_free_device_ib_res(device);
+ list_del(&device->ig_list);
+ kfree(device);
+ }
+ mutex_unlock(&ig.device_list_mutex);
+}
+
+void iser_release_work(struct work_struct *work)
+{
+ struct iser_conn *iser_conn;
+
+ iser_conn = container_of(work, struct iser_conn, release_work);
+
+ /* Wait for conn_stop to complete */
+ wait_for_completion(&iser_conn->stop_completion);
+ /* Wait for IB resouces cleanup to complete */
+ wait_for_completion(&iser_conn->ib_completion);
+
+ mutex_lock(&iser_conn->state_mutex);
+ iser_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&iser_conn->state_mutex);
+
+ iser_conn_release(iser_conn);
+}
+
+/**
+ * iser_free_ib_conn_res - release IB related resources
+ * @iser_conn: iser connection struct
+ * @destroy: indicator if we need to try to release the
+ * iser device and memory regoins pool (only iscsi
+ * shutdown and DEVICE_REMOVAL will use this).
+ *
+ * This routine is called with the iser state mutex held
+ * so the cm_id removal is out of here. It is Safe to
+ * be invoked multiple times.
+ */
+static void iser_free_ib_conn_res(struct iser_conn *iser_conn, bool destroy)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_info("freeing conn %p cma_id %p qp %p\n",
+ iser_conn, ib_conn->cma_id, ib_conn->qp);
+
+ if (ib_conn->qp) {
+ rdma_destroy_qp(ib_conn->cma_id);
+ ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);
+ ib_conn->qp = NULL;
+ }
+
+ if (destroy) {
+ if (iser_conn->rx_descs)
+ iser_free_rx_descriptors(iser_conn);
+
+ if (device) {
+ iser_device_try_release(device);
+ ib_conn->device = NULL;
+ }
+ }
+}
+
+/**
+ * iser_conn_release - Frees all conn objects and deallocs conn descriptor
+ * @iser_conn: iSER connection context
+ */
+void iser_conn_release(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+
+ mutex_lock(&ig.connlist_mutex);
+ list_del(&iser_conn->conn_list);
+ mutex_unlock(&ig.connlist_mutex);
+
+ mutex_lock(&iser_conn->state_mutex);
+ /* In case we endup here without ep_disconnect being invoked. */
+ if (iser_conn->state != ISER_CONN_DOWN) {
+ iser_warn("iser conn %p state %d, expected state down.\n",
+ iser_conn, iser_conn->state);
+ iscsi_destroy_endpoint(iser_conn->ep);
+ iser_conn->state = ISER_CONN_DOWN;
+ }
+ /*
+ * In case we never got to bind stage, we still need to
+ * release IB resources (which is safe to call more than once).
+ */
+ iser_free_ib_conn_res(iser_conn, true);
+ mutex_unlock(&iser_conn->state_mutex);
+
+ if (ib_conn->cma_id) {
+ rdma_destroy_id(ib_conn->cma_id);
+ ib_conn->cma_id = NULL;
+ }
+
+ kfree(iser_conn);
+}
+
+/**
+ * iser_conn_terminate - triggers start of the disconnect procedures and
+ * waits for them to be done
+ * @iser_conn: iSER connection context
+ *
+ * Called with state mutex held
+ */
+int iser_conn_terminate(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ int err = 0;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+
+ /* terminate the iser conn only if the conn state is UP */
+ if (iser_conn->state != ISER_CONN_UP)
+ return 0;
+
+ iser_conn->state = ISER_CONN_TERMINATING;
+ iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
+
+ /* suspend queuing of new iscsi commands */
+ if (iser_conn->iscsi_conn)
+ iscsi_suspend_queue(iser_conn->iscsi_conn);
+
+ /*
+ * In case we didn't already clean up the cma_id (peer initiated
+ * a disconnection), we need to Cause the CMA to change the QP
+ * state to ERROR.
+ */
+ if (ib_conn->cma_id) {
+ err = rdma_disconnect(ib_conn->cma_id);
+ if (err)
+ iser_err("Failed to disconnect, conn: 0x%p err %d\n",
+ iser_conn, err);
+
+ /* block until all flush errors are consumed */
+ ib_drain_qp(ib_conn->qp);
+ }
+
+ return 1;
+}
+
+/*
+ * Called with state mutex held
+ */
+static void iser_connect_error(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *iser_conn = cma_id->context;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+
+ iser_conn->state = ISER_CONN_TERMINATING;
+}
+
+static void iser_calc_scsi_params(struct iser_conn *iser_conn,
+ unsigned int max_sectors)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+ struct ib_device_attr *attr = &device->ib_device->attrs;
+ unsigned short sg_tablesize, sup_sg_tablesize;
+ unsigned short reserved_mr_pages;
+ u32 max_num_sg;
+
+ /*
+ * FRs without SG_GAPS can only map up to a (device) page per entry,
+ * but if the first entry is misaligned we'll end up using two entries
+ * (head and tail) for a single page worth data, so one additional
+ * entry is required.
+ */
+ if (attr->kernel_cap_flags & IBK_SG_GAPS_REG)
+ reserved_mr_pages = 0;
+ else
+ reserved_mr_pages = 1;
+
+ if (iser_conn->ib_conn.pi_support)
+ max_num_sg = attr->max_pi_fast_reg_page_list_len;
+ else
+ max_num_sg = attr->max_fast_reg_page_list_len;
+
+ sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K);
+ sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE,
+ max_num_sg - reserved_mr_pages);
+ iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize);
+ iser_conn->pages_per_mr =
+ iser_conn->scsi_sg_tablesize + reserved_mr_pages;
+}
+
+/*
+ * Called with state mutex held
+ */
+static void iser_addr_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *iser_conn = cma_id->context;
+ struct iser_device *device;
+ struct ib_conn *ib_conn;
+ int ret;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ ib_conn = &iser_conn->ib_conn;
+ device = iser_device_find_by_ib_device(cma_id);
+ if (!device) {
+ iser_err("device lookup/creation failed\n");
+ iser_connect_error(cma_id);
+ return;
+ }
+
+ ib_conn->device = device;
+
+ /* connection T10-PI support */
+ if (iser_pi_enable) {
+ if (!(device->ib_device->attrs.kernel_cap_flags &
+ IBK_INTEGRITY_HANDOVER)) {
+ iser_warn("T10-PI requested but not supported on %s, "
+ "continue without T10-PI\n",
+ dev_name(&ib_conn->device->ib_device->dev));
+ ib_conn->pi_support = false;
+ } else {
+ ib_conn->pi_support = true;
+ }
+ }
+
+ iser_calc_scsi_params(iser_conn, iser_max_sectors);
+
+ ret = rdma_resolve_route(cma_id, 1000);
+ if (ret) {
+ iser_err("resolve route failed: %d\n", ret);
+ iser_connect_error(cma_id);
+ return;
+ }
+}
+
+/*
+ * Called with state mutex held
+ */
+static void iser_route_handler(struct rdma_cm_id *cma_id)
+{
+ struct rdma_conn_param conn_param;
+ int ret;
+ struct iser_cm_hdr req_hdr;
+ struct iser_conn *iser_conn = cma_id->context;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct ib_device *ib_dev = ib_conn->device->ib_device;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ ret = iser_create_ib_conn_res(ib_conn);
+ if (ret)
+ goto failure;
+
+ memset(&conn_param, 0, sizeof conn_param);
+ conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom;
+ conn_param.initiator_depth = 1;
+ conn_param.retry_count = 7;
+ conn_param.rnr_retry_count = 6;
+
+ memset(&req_hdr, 0, sizeof(req_hdr));
+ req_hdr.flags = ISER_ZBVA_NOT_SUP;
+ if (!iser_always_reg)
+ req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP;
+ conn_param.private_data = (void *)&req_hdr;
+ conn_param.private_data_len = sizeof(struct iser_cm_hdr);
+
+ ret = rdma_connect_locked(cma_id, &conn_param);
+ if (ret) {
+ iser_err("failure connecting: %d\n", ret);
+ goto failure;
+ }
+
+ return;
+failure:
+ iser_connect_error(cma_id);
+}
+
+/*
+ * Called with state mutex held
+ */
+static void iser_connected_handler(struct rdma_cm_id *cma_id,
+ const void *private_data)
+{
+ struct iser_conn *iser_conn = cma_id->context;
+ struct ib_qp_attr attr;
+ struct ib_qp_init_attr init_attr;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
+ iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
+
+ if (private_data) {
+ u8 flags = *(u8 *)private_data;
+
+ iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP);
+ }
+
+ iser_info("conn %p: negotiated %s invalidation\n",
+ iser_conn, iser_conn->snd_w_inv ? "remote" : "local");
+
+ iser_conn->state = ISER_CONN_UP;
+ complete(&iser_conn->up_completion);
+}
+
+/*
+ * Called with state mutex held
+ */
+static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
+ bool destroy)
+{
+ struct iser_conn *iser_conn = cma_id->context;
+
+ lockdep_assert_held(&iser_conn->state_mutex);
+ /*
+ * We are not guaranteed that we visited disconnected_handler
+ * by now, call it here to be safe that we handle CM drep
+ * and flush errors.
+ */
+ if (iser_conn_terminate(iser_conn)) {
+ if (iser_conn->iscsi_conn)
+ iscsi_conn_failure(iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+ else
+ iser_err("iscsi_iser connection isn't bound\n");
+ }
+ iser_free_ib_conn_res(iser_conn, destroy);
+ complete(&iser_conn->ib_completion);
+}
+
+static int iser_cma_handler(struct rdma_cm_id *cma_id,
+ struct rdma_cm_event *event)
+{
+ struct iser_conn *iser_conn;
+ int ret = 0;
+
+ iser_conn = cma_id->context;
+ iser_info("%s (%d): status %d conn %p id %p\n",
+ rdma_event_msg(event->event), event->event,
+ event->status, cma_id->context, cma_id);
+
+ mutex_lock(&iser_conn->state_mutex);
+ switch (event->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ iser_addr_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ iser_route_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ iser_connected_handler(cma_id, event->param.conn.private_data);
+ break;
+ case RDMA_CM_EVENT_REJECTED:
+ iser_info("Connection rejected: %s\n",
+ rdma_reject_msg(cma_id, event->status));
+ fallthrough;
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ iser_connect_error(cma_id);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ iser_cleanup_handler(cma_id, false);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ /*
+ * we *must* destroy the device as we cannot rely
+ * on iscsid to be around to initiate error handling.
+ * also if we are not in state DOWN implicitly destroy
+ * the cma_id.
+ */
+ iser_cleanup_handler(cma_id, true);
+ if (iser_conn->state != ISER_CONN_DOWN) {
+ iser_conn->ib_conn.cma_id = NULL;
+ ret = 1;
+ }
+ break;
+ default:
+ iser_err("Unexpected RDMA CM event: %s (%d)\n",
+ rdma_event_msg(event->event), event->event);
+ break;
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+
+ return ret;
+}
+
+void iser_conn_init(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+
+ iser_conn->state = ISER_CONN_INIT;
+ init_completion(&iser_conn->stop_completion);
+ init_completion(&iser_conn->ib_completion);
+ init_completion(&iser_conn->up_completion);
+ INIT_LIST_HEAD(&iser_conn->conn_list);
+ mutex_init(&iser_conn->state_mutex);
+
+ ib_conn->reg_cqe.done = iser_reg_comp;
+}
+
+/*
+ * starts the process of connecting to the target
+ * sleeps until the connection is established or rejected
+ */
+int iser_connect(struct iser_conn *iser_conn, struct sockaddr *src_addr,
+ struct sockaddr *dst_addr, int non_blocking)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ int err = 0;
+
+ mutex_lock(&iser_conn->state_mutex);
+
+ sprintf(iser_conn->name, "%pISp", dst_addr);
+
+ iser_info("connecting to: %s\n", iser_conn->name);
+
+ /* the device is known only --after-- address resolution */
+ ib_conn->device = NULL;
+
+ iser_conn->state = ISER_CONN_PENDING;
+
+ ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler,
+ iser_conn, RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(ib_conn->cma_id)) {
+ err = PTR_ERR(ib_conn->cma_id);
+ iser_err("rdma_create_id failed: %d\n", err);
+ goto id_failure;
+ }
+
+ err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
+ if (err) {
+ iser_err("rdma_resolve_addr failed: %d\n", err);
+ goto addr_failure;
+ }
+
+ if (!non_blocking) {
+ wait_for_completion_interruptible(&iser_conn->up_completion);
+
+ if (iser_conn->state != ISER_CONN_UP) {
+ err = -EIO;
+ goto connect_failure;
+ }
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+
+ mutex_lock(&ig.connlist_mutex);
+ list_add(&iser_conn->conn_list, &ig.connlist);
+ mutex_unlock(&ig.connlist_mutex);
+ return 0;
+
+id_failure:
+ ib_conn->cma_id = NULL;
+addr_failure:
+ iser_conn->state = ISER_CONN_DOWN;
+connect_failure:
+ mutex_unlock(&iser_conn->state_mutex);
+ iser_conn_release(iser_conn);
+ return err;
+}
+
+int iser_post_recvl(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_login_desc *desc = &iser_conn->login_desc;
+ struct ib_recv_wr wr;
+ int ret;
+
+ desc->sge.addr = desc->rsp_dma;
+ desc->sge.length = ISER_RX_LOGIN_SIZE;
+ desc->sge.lkey = ib_conn->device->pd->local_dma_lkey;
+
+ desc->cqe.done = iser_login_rsp;
+ wr.wr_cqe = &desc->cqe;
+ wr.sg_list = &desc->sge;
+ wr.num_sge = 1;
+ wr.next = NULL;
+
+ ret = ib_post_recv(ib_conn->qp, &wr, NULL);
+ if (unlikely(ret))
+ iser_err("ib_post_recv login failed ret=%d\n", ret);
+
+ return ret;
+}
+
+int iser_post_recvm(struct iser_conn *iser_conn, struct iser_rx_desc *rx_desc)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct ib_recv_wr wr;
+ int ret;
+
+ rx_desc->cqe.done = iser_task_rsp;
+ wr.wr_cqe = &rx_desc->cqe;
+ wr.sg_list = &rx_desc->rx_sg;
+ wr.num_sge = 1;
+ wr.next = NULL;
+
+ ret = ib_post_recv(ib_conn->qp, &wr, NULL);
+ if (unlikely(ret))
+ iser_err("ib_post_recv failed ret=%d\n", ret);
+
+ return ret;
+}
+
+
+/**
+ * iser_post_send - Initiate a Send DTO operation
+ * @ib_conn: connection RDMA resources
+ * @tx_desc: iSER TX descriptor
+ *
+ * Return: 0 on success, -1 on failure
+ */
+int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc)
+{
+ struct ib_send_wr *wr = &tx_desc->send_wr;
+ struct ib_send_wr *first_wr;
+ int ret;
+
+ ib_dma_sync_single_for_device(ib_conn->device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN,
+ DMA_TO_DEVICE);
+
+ wr->next = NULL;
+ wr->wr_cqe = &tx_desc->cqe;
+ wr->sg_list = tx_desc->tx_sg;
+ wr->num_sge = tx_desc->num_sge;
+ wr->opcode = IB_WR_SEND;
+ wr->send_flags = IB_SEND_SIGNALED;
+
+ if (tx_desc->inv_wr.next)
+ first_wr = &tx_desc->inv_wr;
+ else if (tx_desc->reg_wr.wr.next)
+ first_wr = &tx_desc->reg_wr.wr;
+ else
+ first_wr = wr;
+
+ ret = ib_post_send(ib_conn->qp, first_wr, NULL);
+ if (unlikely(ret))
+ iser_err("ib_post_send failed, ret:%d opcode:%d\n",
+ ret, wr->opcode);
+
+ return ret;
+}
+
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+ struct iser_fr_desc *desc = reg->desc;
+ unsigned long sector_size = iser_task->sc->device->sector_size;
+ struct ib_mr_status mr_status;
+ int ret;
+
+ if (desc && desc->sig_protected) {
+ desc->sig_protected = false;
+ ret = ib_check_mr_status(desc->rsc.sig_mr,
+ IB_MR_CHECK_SIG_STATUS, &mr_status);
+ if (ret) {
+ iser_err("ib_check_mr_status failed, ret %d\n", ret);
+ /* Not a lot we can do, return ambiguous guard error */
+ *sector = 0;
+ return 0x1;
+ }
+
+ if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
+ sector_t sector_off = mr_status.sig_err.sig_err_offset;
+
+ sector_div(sector_off, sector_size + 8);
+ *sector = scsi_get_sector(iser_task->sc) + sector_off;
+
+ iser_err("PI error found type %d at sector %llx "
+ "expected %x vs actual %x\n",
+ mr_status.sig_err.err_type,
+ (unsigned long long)*sector,
+ mr_status.sig_err.expected,
+ mr_status.sig_err.actual);
+
+ switch (mr_status.sig_err.err_type) {
+ case IB_SIG_BAD_GUARD:
+ return 0x1;
+ case IB_SIG_BAD_REFTAG:
+ return 0x3;
+ case IB_SIG_BAD_APPTAG:
+ return 0x2;
+ }
+ }
+ }
+
+ return 0;
+}
+
+void iser_err_comp(struct ib_wc *wc, const char *type)
+{
+ if (wc->status != IB_WC_WR_FLUSH_ERR) {
+ struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context);
+
+ iser_err("%s failure: %s (%d) vend_err %#x\n", type,
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->vendor_err);
+
+ if (iser_conn->iscsi_conn)
+ iscsi_conn_failure(iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+ } else {
+ iser_dbg("%s failure: %s (%d)\n", type,
+ ib_wc_status_msg(wc->status), wc->status);
+ }
+}