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-rw-r--r--drivers/infiniband/ulp/isert/Kconfig5
-rw-r--r--drivers/infiniband/ulp/isert/Makefile2
-rw-r--r--drivers/infiniband/ulp/isert/ib_isert.c2735
-rw-r--r--drivers/infiniband/ulp/isert/ib_isert.h201
4 files changed, 2943 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/isert/Kconfig b/drivers/infiniband/ulp/isert/Kconfig
new file mode 100644
index 000000000..02f9759eb
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/Kconfig
@@ -0,0 +1,5 @@
+config INFINIBAND_ISERT
+ tristate "iSCSI Extensions for RDMA (iSER) target support"
+ depends on INET && INFINIBAND_ADDR_TRANS && TARGET_CORE && ISCSI_TARGET
+ ---help---
+ Support for iSCSI Extensions for RDMA (iSER) Target on Infiniband fabrics.
diff --git a/drivers/infiniband/ulp/isert/Makefile b/drivers/infiniband/ulp/isert/Makefile
new file mode 100644
index 000000000..c8bf2421f
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/Makefile
@@ -0,0 +1,2 @@
+ccflags-y := -Idrivers/target -Idrivers/target/iscsi
+obj-$(CONFIG_INFINIBAND_ISERT) += ib_isert.o
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
new file mode 100644
index 000000000..f39670c5c
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -0,0 +1,2735 @@
+/*******************************************************************************
+ * This file contains iSCSI extentions for RDMA (iSER) Verbs
+ *
+ * (c) Copyright 2013 Datera, Inc.
+ *
+ * Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
+#include <linux/semaphore.h>
+
+#include "ib_isert.h"
+
+#define ISERT_MAX_CONN 8
+#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
+#define ISER_MAX_TX_CQ_LEN \
+ ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
+#define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
+ ISERT_MAX_CONN)
+
+static int isert_debug_level;
+module_param_named(debug_level, isert_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
+
+static DEFINE_MUTEX(device_list_mutex);
+static LIST_HEAD(device_list);
+static struct workqueue_struct *isert_comp_wq;
+static struct workqueue_struct *isert_release_wq;
+
+static int
+isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
+static int
+isert_login_post_recv(struct isert_conn *isert_conn);
+static int
+isert_rdma_accept(struct isert_conn *isert_conn);
+struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
+
+static void isert_release_work(struct work_struct *work);
+static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
+static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
+
+static inline bool
+isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
+{
+ return (conn->pi_support &&
+ cmd->prot_op != TARGET_PROT_NORMAL);
+}
+
+
+static void
+isert_qp_event_callback(struct ib_event *e, void *context)
+{
+ struct isert_conn *isert_conn = context;
+
+ isert_err("%s (%d): conn %p\n",
+ ib_event_msg(e->event), e->event, isert_conn);
+
+ switch (e->event) {
+ case IB_EVENT_COMM_EST:
+ rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
+ break;
+ case IB_EVENT_QP_LAST_WQE_REACHED:
+ isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
+ break;
+ default:
+ break;
+ }
+}
+
+static struct isert_comp *
+isert_comp_get(struct isert_conn *isert_conn)
+{
+ struct isert_device *device = isert_conn->device;
+ struct isert_comp *comp;
+ int i, min = 0;
+
+ mutex_lock(&device_list_mutex);
+ for (i = 0; i < device->comps_used; i++)
+ if (device->comps[i].active_qps <
+ device->comps[min].active_qps)
+ min = i;
+ comp = &device->comps[min];
+ comp->active_qps++;
+ mutex_unlock(&device_list_mutex);
+
+ isert_info("conn %p, using comp %p min_index: %d\n",
+ isert_conn, comp, min);
+
+ return comp;
+}
+
+static void
+isert_comp_put(struct isert_comp *comp)
+{
+ mutex_lock(&device_list_mutex);
+ comp->active_qps--;
+ mutex_unlock(&device_list_mutex);
+}
+
+static struct ib_qp *
+isert_create_qp(struct isert_conn *isert_conn,
+ struct isert_comp *comp,
+ struct rdma_cm_id *cma_id)
+{
+ struct isert_device *device = isert_conn->device;
+ struct ib_qp_init_attr attr;
+ int ret;
+
+ memset(&attr, 0, sizeof(struct ib_qp_init_attr));
+ attr.event_handler = isert_qp_event_callback;
+ attr.qp_context = isert_conn;
+ attr.send_cq = comp->cq;
+ attr.recv_cq = comp->cq;
+ attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
+ attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
+ attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
+ attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
+ attr.cap.max_recv_sge = 1;
+ attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ attr.qp_type = IB_QPT_RC;
+ if (device->pi_capable)
+ attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
+
+ ret = rdma_create_qp(cma_id, device->pd, &attr);
+ if (ret) {
+ isert_err("rdma_create_qp failed for cma_id %d\n", ret);
+ return ERR_PTR(ret);
+ }
+
+ return cma_id->qp;
+}
+
+static int
+isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
+{
+ struct isert_comp *comp;
+ int ret;
+
+ comp = isert_comp_get(isert_conn);
+ isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
+ if (IS_ERR(isert_conn->qp)) {
+ ret = PTR_ERR(isert_conn->qp);
+ goto err;
+ }
+
+ return 0;
+err:
+ isert_comp_put(comp);
+ return ret;
+}
+
+static int
+isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
+{
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ struct iser_rx_desc *rx_desc;
+ struct ib_sge *rx_sg;
+ u64 dma_addr;
+ int i, j;
+
+ isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
+ sizeof(struct iser_rx_desc),
+ GFP_KERNEL);
+ if (!isert_conn->rx_descs)
+ return -ENOMEM;
+
+ rx_desc = isert_conn->rx_descs;
+
+ for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
+ dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, dma_addr))
+ goto dma_map_fail;
+
+ rx_desc->dma_addr = dma_addr;
+
+ 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;
+ rx_desc->rx_cqe.done = isert_recv_done;
+ }
+
+ return 0;
+
+dma_map_fail:
+ rx_desc = isert_conn->rx_descs;
+ for (j = 0; j < i; j++, rx_desc++) {
+ ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ }
+ kfree(isert_conn->rx_descs);
+ isert_conn->rx_descs = NULL;
+ isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
+ return -ENOMEM;
+}
+
+static void
+isert_free_rx_descriptors(struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->device->ib_device;
+ struct iser_rx_desc *rx_desc;
+ int i;
+
+ if (!isert_conn->rx_descs)
+ return;
+
+ rx_desc = isert_conn->rx_descs;
+ for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
+ ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ }
+
+ kfree(isert_conn->rx_descs);
+ isert_conn->rx_descs = NULL;
+}
+
+static void
+isert_free_comps(struct isert_device *device)
+{
+ int i;
+
+ for (i = 0; i < device->comps_used; i++) {
+ struct isert_comp *comp = &device->comps[i];
+
+ if (comp->cq)
+ ib_free_cq(comp->cq);
+ }
+ kfree(device->comps);
+}
+
+static int
+isert_alloc_comps(struct isert_device *device)
+{
+ int i, max_cqe, ret = 0;
+
+ device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
+ device->ib_device->num_comp_vectors));
+
+ isert_info("Using %d CQs, %s supports %d vectors support "
+ "pi_capable %d\n",
+ device->comps_used, device->ib_device->name,
+ device->ib_device->num_comp_vectors,
+ device->pi_capable);
+
+ device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
+ GFP_KERNEL);
+ if (!device->comps)
+ return -ENOMEM;
+
+ max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
+
+ for (i = 0; i < device->comps_used; i++) {
+ struct isert_comp *comp = &device->comps[i];
+
+ comp->device = device;
+ comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
+ IB_POLL_WORKQUEUE);
+ if (IS_ERR(comp->cq)) {
+ isert_err("Unable to allocate cq\n");
+ ret = PTR_ERR(comp->cq);
+ comp->cq = NULL;
+ goto out_cq;
+ }
+ }
+
+ return 0;
+out_cq:
+ isert_free_comps(device);
+ return ret;
+}
+
+static int
+isert_create_device_ib_res(struct isert_device *device)
+{
+ struct ib_device *ib_dev = device->ib_device;
+ int ret;
+
+ isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
+ ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
+ isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
+
+ ret = isert_alloc_comps(device);
+ if (ret)
+ goto out;
+
+ device->pd = ib_alloc_pd(ib_dev, 0);
+ if (IS_ERR(device->pd)) {
+ ret = PTR_ERR(device->pd);
+ isert_err("failed to allocate pd, device %p, ret=%d\n",
+ device, ret);
+ goto out_cq;
+ }
+
+ /* Check signature cap */
+ device->pi_capable = ib_dev->attrs.device_cap_flags &
+ IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
+
+ return 0;
+
+out_cq:
+ isert_free_comps(device);
+out:
+ if (ret > 0)
+ ret = -EINVAL;
+ return ret;
+}
+
+static void
+isert_free_device_ib_res(struct isert_device *device)
+{
+ isert_info("device %p\n", device);
+
+ ib_dealloc_pd(device->pd);
+ isert_free_comps(device);
+}
+
+static void
+isert_device_put(struct isert_device *device)
+{
+ mutex_lock(&device_list_mutex);
+ device->refcount--;
+ isert_info("device %p refcount %d\n", device, device->refcount);
+ if (!device->refcount) {
+ isert_free_device_ib_res(device);
+ list_del(&device->dev_node);
+ kfree(device);
+ }
+ mutex_unlock(&device_list_mutex);
+}
+
+static struct isert_device *
+isert_device_get(struct rdma_cm_id *cma_id)
+{
+ struct isert_device *device;
+ int ret;
+
+ mutex_lock(&device_list_mutex);
+ list_for_each_entry(device, &device_list, dev_node) {
+ if (device->ib_device->node_guid == cma_id->device->node_guid) {
+ device->refcount++;
+ isert_info("Found iser device %p refcount %d\n",
+ device, device->refcount);
+ mutex_unlock(&device_list_mutex);
+ return device;
+ }
+ }
+
+ device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
+ if (!device) {
+ mutex_unlock(&device_list_mutex);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ INIT_LIST_HEAD(&device->dev_node);
+
+ device->ib_device = cma_id->device;
+ ret = isert_create_device_ib_res(device);
+ if (ret) {
+ kfree(device);
+ mutex_unlock(&device_list_mutex);
+ return ERR_PTR(ret);
+ }
+
+ device->refcount++;
+ list_add_tail(&device->dev_node, &device_list);
+ isert_info("Created a new iser device %p refcount %d\n",
+ device, device->refcount);
+ mutex_unlock(&device_list_mutex);
+
+ return device;
+}
+
+static void
+isert_init_conn(struct isert_conn *isert_conn)
+{
+ isert_conn->state = ISER_CONN_INIT;
+ INIT_LIST_HEAD(&isert_conn->node);
+ init_completion(&isert_conn->login_comp);
+ init_completion(&isert_conn->login_req_comp);
+ init_waitqueue_head(&isert_conn->rem_wait);
+ kref_init(&isert_conn->kref);
+ mutex_init(&isert_conn->mutex);
+ INIT_WORK(&isert_conn->release_work, isert_release_work);
+}
+
+static void
+isert_free_login_buf(struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->device->ib_device;
+
+ ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
+ ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
+ kfree(isert_conn->login_rsp_buf);
+
+ ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+ ISER_RX_PAYLOAD_SIZE,
+ DMA_FROM_DEVICE);
+ kfree(isert_conn->login_req_buf);
+}
+
+static int
+isert_alloc_login_buf(struct isert_conn *isert_conn,
+ struct ib_device *ib_dev)
+{
+ int ret;
+
+ isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
+ GFP_KERNEL);
+ if (!isert_conn->login_req_buf)
+ return -ENOMEM;
+
+ isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
+ isert_conn->login_req_buf,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
+ if (ret) {
+ isert_err("login_req_dma mapping error: %d\n", ret);
+ isert_conn->login_req_dma = 0;
+ goto out_free_login_req_buf;
+ }
+
+ isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
+ if (!isert_conn->login_rsp_buf) {
+ ret = -ENOMEM;
+ goto out_unmap_login_req_buf;
+ }
+
+ isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
+ isert_conn->login_rsp_buf,
+ ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
+ ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
+ if (ret) {
+ isert_err("login_rsp_dma mapping error: %d\n", ret);
+ isert_conn->login_rsp_dma = 0;
+ goto out_free_login_rsp_buf;
+ }
+
+ return 0;
+
+out_free_login_rsp_buf:
+ kfree(isert_conn->login_rsp_buf);
+out_unmap_login_req_buf:
+ ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+out_free_login_req_buf:
+ kfree(isert_conn->login_req_buf);
+ return ret;
+}
+
+static void
+isert_set_nego_params(struct isert_conn *isert_conn,
+ struct rdma_conn_param *param)
+{
+ struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
+
+ /* Set max inflight RDMA READ requests */
+ isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
+ attr->max_qp_init_rd_atom);
+ isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
+
+ if (param->private_data) {
+ u8 flags = *(u8 *)param->private_data;
+
+ /*
+ * use remote invalidation if the both initiator
+ * and the HCA support it
+ */
+ isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
+ (attr->device_cap_flags &
+ IB_DEVICE_MEM_MGT_EXTENSIONS);
+ if (isert_conn->snd_w_inv)
+ isert_info("Using remote invalidation\n");
+ }
+}
+
+static int
+isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ struct isert_np *isert_np = cma_id->context;
+ struct iscsi_np *np = isert_np->np;
+ struct isert_conn *isert_conn;
+ struct isert_device *device;
+ int ret = 0;
+
+ spin_lock_bh(&np->np_thread_lock);
+ if (!np->enabled) {
+ spin_unlock_bh(&np->np_thread_lock);
+ isert_dbg("iscsi_np is not enabled, reject connect request\n");
+ return rdma_reject(cma_id, NULL, 0);
+ }
+ spin_unlock_bh(&np->np_thread_lock);
+
+ isert_dbg("cma_id: %p, portal: %p\n",
+ cma_id, cma_id->context);
+
+ isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
+ if (!isert_conn)
+ return -ENOMEM;
+
+ isert_init_conn(isert_conn);
+ isert_conn->cm_id = cma_id;
+
+ ret = isert_alloc_login_buf(isert_conn, cma_id->device);
+ if (ret)
+ goto out;
+
+ device = isert_device_get(cma_id);
+ if (IS_ERR(device)) {
+ ret = PTR_ERR(device);
+ goto out_rsp_dma_map;
+ }
+ isert_conn->device = device;
+
+ isert_set_nego_params(isert_conn, &event->param.conn);
+
+ ret = isert_conn_setup_qp(isert_conn, cma_id);
+ if (ret)
+ goto out_conn_dev;
+
+ ret = isert_login_post_recv(isert_conn);
+ if (ret)
+ goto out_conn_dev;
+
+ ret = isert_rdma_accept(isert_conn);
+ if (ret)
+ goto out_conn_dev;
+
+ mutex_lock(&isert_np->mutex);
+ list_add_tail(&isert_conn->node, &isert_np->accepted);
+ mutex_unlock(&isert_np->mutex);
+
+ return 0;
+
+out_conn_dev:
+ isert_device_put(device);
+out_rsp_dma_map:
+ isert_free_login_buf(isert_conn);
+out:
+ kfree(isert_conn);
+ rdma_reject(cma_id, NULL, 0);
+ return ret;
+}
+
+static void
+isert_connect_release(struct isert_conn *isert_conn)
+{
+ struct isert_device *device = isert_conn->device;
+
+ isert_dbg("conn %p\n", isert_conn);
+
+ BUG_ON(!device);
+
+ isert_free_rx_descriptors(isert_conn);
+ if (isert_conn->cm_id &&
+ !isert_conn->dev_removed)
+ rdma_destroy_id(isert_conn->cm_id);
+
+ if (isert_conn->qp) {
+ struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
+
+ isert_comp_put(comp);
+ ib_destroy_qp(isert_conn->qp);
+ }
+
+ if (isert_conn->login_req_buf)
+ isert_free_login_buf(isert_conn);
+
+ isert_device_put(device);
+
+ if (isert_conn->dev_removed)
+ wake_up_interruptible(&isert_conn->rem_wait);
+ else
+ kfree(isert_conn);
+}
+
+static void
+isert_connected_handler(struct rdma_cm_id *cma_id)
+{
+ struct isert_conn *isert_conn = cma_id->qp->qp_context;
+ struct isert_np *isert_np = cma_id->context;
+
+ isert_info("conn %p\n", isert_conn);
+
+ mutex_lock(&isert_conn->mutex);
+ isert_conn->state = ISER_CONN_UP;
+ kref_get(&isert_conn->kref);
+ mutex_unlock(&isert_conn->mutex);
+
+ mutex_lock(&isert_np->mutex);
+ list_move_tail(&isert_conn->node, &isert_np->pending);
+ mutex_unlock(&isert_np->mutex);
+
+ isert_info("np %p: Allow accept_np to continue\n", isert_np);
+ up(&isert_np->sem);
+}
+
+static void
+isert_release_kref(struct kref *kref)
+{
+ struct isert_conn *isert_conn = container_of(kref,
+ struct isert_conn, kref);
+
+ isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
+ current->pid);
+
+ isert_connect_release(isert_conn);
+}
+
+static void
+isert_put_conn(struct isert_conn *isert_conn)
+{
+ kref_put(&isert_conn->kref, isert_release_kref);
+}
+
+static void
+isert_handle_unbound_conn(struct isert_conn *isert_conn)
+{
+ struct isert_np *isert_np = isert_conn->cm_id->context;
+
+ mutex_lock(&isert_np->mutex);
+ if (!list_empty(&isert_conn->node)) {
+ /*
+ * This means iscsi doesn't know this connection
+ * so schedule a cleanup ourselves
+ */
+ list_del_init(&isert_conn->node);
+ isert_put_conn(isert_conn);
+ queue_work(isert_release_wq, &isert_conn->release_work);
+ }
+ mutex_unlock(&isert_np->mutex);
+}
+
+/**
+ * isert_conn_terminate() - Initiate connection termination
+ * @isert_conn: isert connection struct
+ *
+ * Notes:
+ * In case the connection state is BOUND, move state
+ * to TEMINATING and start teardown sequence (rdma_disconnect).
+ * In case the connection state is UP, complete flush as well.
+ *
+ * This routine must be called with mutex held. Thus it is
+ * safe to call multiple times.
+ */
+static void
+isert_conn_terminate(struct isert_conn *isert_conn)
+{
+ int err;
+
+ if (isert_conn->state >= ISER_CONN_TERMINATING)
+ return;
+
+ isert_info("Terminating conn %p state %d\n",
+ isert_conn, isert_conn->state);
+ isert_conn->state = ISER_CONN_TERMINATING;
+ err = rdma_disconnect(isert_conn->cm_id);
+ if (err)
+ isert_warn("Failed rdma_disconnect isert_conn %p\n",
+ isert_conn);
+}
+
+static int
+isert_np_cma_handler(struct isert_np *isert_np,
+ enum rdma_cm_event_type event)
+{
+ isert_dbg("%s (%d): isert np %p\n",
+ rdma_event_msg(event), event, isert_np);
+
+ switch (event) {
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ isert_np->cm_id = NULL;
+ break;
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ isert_np->cm_id = isert_setup_id(isert_np);
+ if (IS_ERR(isert_np->cm_id)) {
+ isert_err("isert np %p setup id failed: %ld\n",
+ isert_np, PTR_ERR(isert_np->cm_id));
+ isert_np->cm_id = NULL;
+ }
+ break;
+ default:
+ isert_err("isert np %p Unexpected event %d\n",
+ isert_np, event);
+ }
+
+ return -1;
+}
+
+static int
+isert_disconnected_handler(struct rdma_cm_id *cma_id,
+ enum rdma_cm_event_type event)
+{
+ struct isert_conn *isert_conn = cma_id->qp->qp_context;
+
+ mutex_lock(&isert_conn->mutex);
+ switch (isert_conn->state) {
+ case ISER_CONN_TERMINATING:
+ break;
+ case ISER_CONN_UP:
+ isert_conn_terminate(isert_conn);
+ ib_drain_qp(isert_conn->qp);
+ isert_handle_unbound_conn(isert_conn);
+ break;
+ case ISER_CONN_BOUND:
+ case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ break;
+ default:
+ isert_warn("conn %p terminating in state %d\n",
+ isert_conn, isert_conn->state);
+ }
+ mutex_unlock(&isert_conn->mutex);
+
+ return 0;
+}
+
+static int
+isert_connect_error(struct rdma_cm_id *cma_id)
+{
+ struct isert_conn *isert_conn = cma_id->qp->qp_context;
+
+ ib_drain_qp(isert_conn->qp);
+ list_del_init(&isert_conn->node);
+ isert_conn->cm_id = NULL;
+ isert_put_conn(isert_conn);
+
+ return -1;
+}
+
+static int
+isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ struct isert_np *isert_np = cma_id->context;
+ struct isert_conn *isert_conn;
+ int ret = 0;
+
+ isert_info("%s (%d): status %d id %p np %p\n",
+ rdma_event_msg(event->event), event->event,
+ event->status, cma_id, cma_id->context);
+
+ if (isert_np->cm_id == cma_id)
+ return isert_np_cma_handler(cma_id->context, event->event);
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ ret = isert_connect_request(cma_id, event);
+ if (ret)
+ isert_err("failed handle connect request %d\n", ret);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ isert_connected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
+ case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
+ ret = isert_disconnected_handler(cma_id, event->event);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ isert_conn = cma_id->qp->qp_context;
+ isert_conn->dev_removed = true;
+ isert_disconnected_handler(cma_id, event->event);
+ wait_event_interruptible(isert_conn->rem_wait,
+ isert_conn->state == ISER_CONN_DOWN);
+ kfree(isert_conn);
+ /*
+ * return non-zero from the callback to destroy
+ * the rdma cm id
+ */
+ return 1;
+ case RDMA_CM_EVENT_REJECTED:
+ isert_info("Connection rejected: %s\n",
+ rdma_reject_msg(cma_id, event->status));
+ /* fall through */
+ case RDMA_CM_EVENT_UNREACHABLE:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ ret = isert_connect_error(cma_id);
+ break;
+ default:
+ isert_err("Unhandled RDMA CMA event: %d\n", event->event);
+ break;
+ }
+
+ return ret;
+}
+
+static int
+isert_post_recvm(struct isert_conn *isert_conn, u32 count)
+{
+ struct ib_recv_wr *rx_wr;
+ int i, ret;
+ struct iser_rx_desc *rx_desc;
+
+ for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
+ rx_desc = &isert_conn->rx_descs[i];
+
+ rx_wr->wr_cqe = &rx_desc->rx_cqe;
+ rx_wr->sg_list = &rx_desc->rx_sg;
+ rx_wr->num_sge = 1;
+ rx_wr->next = rx_wr + 1;
+ rx_desc->in_use = false;
+ }
+ rx_wr--;
+ rx_wr->next = NULL; /* mark end of work requests list */
+
+ ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
+ if (ret)
+ isert_err("ib_post_recv() failed with ret: %d\n", ret);
+
+ return ret;
+}
+
+static int
+isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
+{
+ struct ib_recv_wr rx_wr;
+ int ret;
+
+ if (!rx_desc->in_use) {
+ /*
+ * if the descriptor is not in-use we already reposted it
+ * for recv, so just silently return
+ */
+ return 0;
+ }
+
+ rx_desc->in_use = false;
+ rx_wr.wr_cqe = &rx_desc->rx_cqe;
+ rx_wr.sg_list = &rx_desc->rx_sg;
+ rx_wr.num_sge = 1;
+ rx_wr.next = NULL;
+
+ ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
+ if (ret)
+ isert_err("ib_post_recv() failed with ret: %d\n", ret);
+
+ return ret;
+}
+
+static int
+isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
+{
+ struct ib_device *ib_dev = isert_conn->cm_id->device;
+ struct ib_send_wr send_wr;
+ int ret;
+
+ ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ tx_desc->tx_cqe.done = isert_login_send_done;
+
+ send_wr.next = NULL;
+ send_wr.wr_cqe = &tx_desc->tx_cqe;
+ send_wr.sg_list = tx_desc->tx_sg;
+ send_wr.num_sge = tx_desc->num_sge;
+ send_wr.opcode = IB_WR_SEND;
+ send_wr.send_flags = IB_SEND_SIGNALED;
+
+ ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
+ if (ret)
+ isert_err("ib_post_send() failed, ret: %d\n", ret);
+
+ return ret;
+}
+
+static void
+__isert_create_send_desc(struct isert_device *device,
+ struct iser_tx_desc *tx_desc)
+{
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
+ tx_desc->iser_header.flags = ISCSI_CTRL;
+
+ tx_desc->num_sge = 1;
+
+ if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
+ tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
+ isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
+ }
+}
+
+static void
+isert_create_send_desc(struct isert_conn *isert_conn,
+ struct isert_cmd *isert_cmd,
+ struct iser_tx_desc *tx_desc)
+{
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+
+ ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ __isert_create_send_desc(device, tx_desc);
+}
+
+static int
+isert_init_tx_hdrs(struct isert_conn *isert_conn,
+ struct iser_tx_desc *tx_desc)
+{
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ u64 dma_addr;
+
+ dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, dma_addr)) {
+ isert_err("ib_dma_mapping_error() failed\n");
+ return -ENOMEM;
+ }
+
+ 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;
+
+ isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
+ tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
+ tx_desc->tx_sg[0].lkey);
+
+ return 0;
+}
+
+static void
+isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+ struct ib_send_wr *send_wr)
+{
+ struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
+
+ tx_desc->tx_cqe.done = isert_send_done;
+ send_wr->wr_cqe = &tx_desc->tx_cqe;
+
+ if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
+ send_wr->opcode = IB_WR_SEND_WITH_INV;
+ send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
+ } else {
+ send_wr->opcode = IB_WR_SEND;
+ }
+
+ send_wr->sg_list = &tx_desc->tx_sg[0];
+ send_wr->num_sge = isert_cmd->tx_desc.num_sge;
+ send_wr->send_flags = IB_SEND_SIGNALED;
+}
+
+static int
+isert_login_post_recv(struct isert_conn *isert_conn)
+{
+ struct ib_recv_wr rx_wr;
+ struct ib_sge sge;
+ int ret;
+
+ memset(&sge, 0, sizeof(struct ib_sge));
+ sge.addr = isert_conn->login_req_dma;
+ sge.length = ISER_RX_PAYLOAD_SIZE;
+ sge.lkey = isert_conn->device->pd->local_dma_lkey;
+
+ isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
+ sge.addr, sge.length, sge.lkey);
+
+ isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
+
+ memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
+ rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
+ rx_wr.sg_list = &sge;
+ rx_wr.num_sge = 1;
+
+ ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
+ if (ret)
+ isert_err("ib_post_recv() failed: %d\n", ret);
+
+ return ret;
+}
+
+static int
+isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
+ u32 length)
+{
+ struct isert_conn *isert_conn = conn->context;
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
+ int ret;
+
+ __isert_create_send_desc(device, tx_desc);
+
+ memcpy(&tx_desc->iscsi_header, &login->rsp[0],
+ sizeof(struct iscsi_hdr));
+
+ isert_init_tx_hdrs(isert_conn, tx_desc);
+
+ if (length > 0) {
+ struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
+
+ ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
+ length, DMA_TO_DEVICE);
+
+ memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
+
+ ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
+ length, DMA_TO_DEVICE);
+
+ tx_dsg->addr = isert_conn->login_rsp_dma;
+ tx_dsg->length = length;
+ tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
+ tx_desc->num_sge = 2;
+ }
+ if (!login->login_failed) {
+ if (login->login_complete) {
+ ret = isert_alloc_rx_descriptors(isert_conn);
+ if (ret)
+ return ret;
+
+ ret = isert_post_recvm(isert_conn,
+ ISERT_QP_MAX_RECV_DTOS);
+ if (ret)
+ return ret;
+
+ /* Now we are in FULL_FEATURE phase */
+ mutex_lock(&isert_conn->mutex);
+ isert_conn->state = ISER_CONN_FULL_FEATURE;
+ mutex_unlock(&isert_conn->mutex);
+ goto post_send;
+ }
+
+ ret = isert_login_post_recv(isert_conn);
+ if (ret)
+ return ret;
+ }
+post_send:
+ ret = isert_login_post_send(isert_conn, tx_desc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void
+isert_rx_login_req(struct isert_conn *isert_conn)
+{
+ struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
+ int rx_buflen = isert_conn->login_req_len;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_login *login = conn->conn_login;
+ int size;
+
+ isert_info("conn %p\n", isert_conn);
+
+ WARN_ON_ONCE(!login);
+
+ if (login->first_request) {
+ struct iscsi_login_req *login_req =
+ (struct iscsi_login_req *)&rx_desc->iscsi_header;
+ /*
+ * Setup the initial iscsi_login values from the leading
+ * login request PDU.
+ */
+ login->leading_connection = (!login_req->tsih) ? 1 : 0;
+ login->current_stage =
+ (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
+ >> 2;
+ login->version_min = login_req->min_version;
+ login->version_max = login_req->max_version;
+ memcpy(login->isid, login_req->isid, 6);
+ login->cmd_sn = be32_to_cpu(login_req->cmdsn);
+ login->init_task_tag = login_req->itt;
+ login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
+ login->cid = be16_to_cpu(login_req->cid);
+ login->tsih = be16_to_cpu(login_req->tsih);
+ }
+
+ memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
+
+ size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
+ isert_dbg("Using login payload size: %d, rx_buflen: %d "
+ "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
+ MAX_KEY_VALUE_PAIRS);
+ memcpy(login->req_buf, &rx_desc->data[0], size);
+
+ if (login->first_request) {
+ complete(&isert_conn->login_comp);
+ return;
+ }
+ schedule_delayed_work(&conn->login_work, 0);
+}
+
+static struct iscsi_cmd
+*isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
+{
+ struct isert_conn *isert_conn = conn->context;
+ struct isert_cmd *isert_cmd;
+ struct iscsi_cmd *cmd;
+
+ cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
+ if (!cmd) {
+ isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
+ return NULL;
+ }
+ isert_cmd = iscsit_priv_cmd(cmd);
+ isert_cmd->conn = isert_conn;
+ isert_cmd->iscsi_cmd = cmd;
+ isert_cmd->rx_desc = rx_desc;
+
+ return cmd;
+}
+
+static int
+isert_handle_scsi_cmd(struct isert_conn *isert_conn,
+ struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
+ struct iser_rx_desc *rx_desc, unsigned char *buf)
+{
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
+ int imm_data, imm_data_len, unsol_data, sg_nents, rc;
+ bool dump_payload = false;
+ unsigned int data_len;
+
+ rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
+ if (rc < 0)
+ return rc;
+
+ imm_data = cmd->immediate_data;
+ imm_data_len = cmd->first_burst_len;
+ unsol_data = cmd->unsolicited_data;
+ data_len = cmd->se_cmd.data_length;
+
+ if (imm_data && imm_data_len == data_len)
+ cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
+ rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
+ if (rc < 0) {
+ return 0;
+ } else if (rc > 0) {
+ dump_payload = true;
+ goto sequence_cmd;
+ }
+
+ if (!imm_data)
+ return 0;
+
+ if (imm_data_len != data_len) {
+ sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
+ sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
+ &rx_desc->data[0], imm_data_len);
+ isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
+ sg_nents, imm_data_len);
+ } else {
+ sg_init_table(&isert_cmd->sg, 1);
+ cmd->se_cmd.t_data_sg = &isert_cmd->sg;
+ cmd->se_cmd.t_data_nents = 1;
+ sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
+ isert_dbg("Transfer Immediate imm_data_len: %d\n",
+ imm_data_len);
+ }
+
+ cmd->write_data_done += imm_data_len;
+
+ if (cmd->write_data_done == cmd->se_cmd.data_length) {
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+ cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+ spin_unlock_bh(&cmd->istate_lock);
+ }
+
+sequence_cmd:
+ rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
+
+ if (!rc && dump_payload == false && unsol_data)
+ iscsit_set_unsoliticed_dataout(cmd);
+ else if (dump_payload && imm_data)
+ target_put_sess_cmd(&cmd->se_cmd);
+
+ return 0;
+}
+
+static int
+isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
+ struct iser_rx_desc *rx_desc, unsigned char *buf)
+{
+ struct scatterlist *sg_start;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_cmd *cmd = NULL;
+ struct iscsi_data *hdr = (struct iscsi_data *)buf;
+ u32 unsol_data_len = ntoh24(hdr->dlength);
+ int rc, sg_nents, sg_off, page_off;
+
+ rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
+ if (rc < 0)
+ return rc;
+ else if (!cmd)
+ return 0;
+ /*
+ * FIXME: Unexpected unsolicited_data out
+ */
+ if (!cmd->unsolicited_data) {
+ isert_err("Received unexpected solicited data payload\n");
+ dump_stack();
+ return -1;
+ }
+
+ isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
+ "write_data_done: %u, data_length: %u\n",
+ unsol_data_len, cmd->write_data_done,
+ cmd->se_cmd.data_length);
+
+ sg_off = cmd->write_data_done / PAGE_SIZE;
+ sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+ sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
+ page_off = cmd->write_data_done % PAGE_SIZE;
+ /*
+ * FIXME: Non page-aligned unsolicited_data out
+ */
+ if (page_off) {
+ isert_err("unexpected non-page aligned data payload\n");
+ dump_stack();
+ return -1;
+ }
+ isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
+ "sg_nents: %u from %p %u\n", sg_start, sg_off,
+ sg_nents, &rx_desc->data[0], unsol_data_len);
+
+ sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
+ unsol_data_len);
+
+ rc = iscsit_check_dataout_payload(cmd, hdr, false);
+ if (rc < 0)
+ return rc;
+
+ /*
+ * multiple data-outs on the same command can arrive -
+ * so post the buffer before hand
+ */
+ rc = isert_post_recv(isert_conn, rx_desc);
+ if (rc) {
+ isert_err("ib_post_recv failed with %d\n", rc);
+ return rc;
+ }
+ return 0;
+}
+
+static int
+isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+ struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
+ unsigned char *buf)
+{
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
+ int rc;
+
+ rc = iscsit_setup_nop_out(conn, cmd, hdr);
+ if (rc < 0)
+ return rc;
+ /*
+ * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
+ */
+
+ return iscsit_process_nop_out(conn, cmd, hdr);
+}
+
+static int
+isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+ struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
+ struct iscsi_text *hdr)
+{
+ struct iscsi_conn *conn = isert_conn->conn;
+ u32 payload_length = ntoh24(hdr->dlength);
+ int rc;
+ unsigned char *text_in = NULL;
+
+ rc = iscsit_setup_text_cmd(conn, cmd, hdr);
+ if (rc < 0)
+ return rc;
+
+ if (payload_length) {
+ text_in = kzalloc(payload_length, GFP_KERNEL);
+ if (!text_in)
+ return -ENOMEM;
+ }
+ cmd->text_in_ptr = text_in;
+
+ memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
+
+ return iscsit_process_text_cmd(conn, cmd, hdr);
+}
+
+static int
+isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
+ uint32_t read_stag, uint64_t read_va,
+ uint32_t write_stag, uint64_t write_va)
+{
+ struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_cmd *cmd;
+ struct isert_cmd *isert_cmd;
+ int ret = -EINVAL;
+ u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
+
+ if (conn->sess->sess_ops->SessionType &&
+ (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
+ isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
+ " ignoring\n", opcode);
+ return 0;
+ }
+
+ switch (opcode) {
+ case ISCSI_OP_SCSI_CMD:
+ cmd = isert_allocate_cmd(conn, rx_desc);
+ if (!cmd)
+ break;
+
+ isert_cmd = iscsit_priv_cmd(cmd);
+ isert_cmd->read_stag = read_stag;
+ isert_cmd->read_va = read_va;
+ isert_cmd->write_stag = write_stag;
+ isert_cmd->write_va = write_va;
+ isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
+
+ ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
+ rx_desc, (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_NOOP_OUT:
+ cmd = isert_allocate_cmd(conn, rx_desc);
+ if (!cmd)
+ break;
+
+ isert_cmd = iscsit_priv_cmd(cmd);
+ ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
+ rx_desc, (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_SCSI_DATA_OUT:
+ ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
+ (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_SCSI_TMFUNC:
+ cmd = isert_allocate_cmd(conn, rx_desc);
+ if (!cmd)
+ break;
+
+ ret = iscsit_handle_task_mgt_cmd(conn, cmd,
+ (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_LOGOUT:
+ cmd = isert_allocate_cmd(conn, rx_desc);
+ if (!cmd)
+ break;
+
+ ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_TEXT:
+ if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
+ cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
+ else
+ cmd = isert_allocate_cmd(conn, rx_desc);
+
+ if (!cmd)
+ break;
+
+ isert_cmd = iscsit_priv_cmd(cmd);
+ ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
+ rx_desc, (struct iscsi_text *)hdr);
+ break;
+ default:
+ isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
+ dump_stack();
+ break;
+ }
+
+ return ret;
+}
+
+static void
+isert_print_wc(struct ib_wc *wc, const char *type)
+{
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ isert_err("%s failure: %s (%d) vend_err %x\n", type,
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->vendor_err);
+ else
+ isert_dbg("%s failure: %s (%d)\n", type,
+ ib_wc_status_msg(wc->status), wc->status);
+}
+
+static void
+isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct ib_device *ib_dev = isert_conn->cm_id->device;
+ struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
+ struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
+ struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
+ uint64_t read_va = 0, write_va = 0;
+ uint32_t read_stag = 0, write_stag = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "recv");
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ return;
+ }
+
+ rx_desc->in_use = true;
+
+ ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+
+ isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
+ rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
+ (int)(wc->byte_len - ISER_HEADERS_LEN));
+
+ switch (iser_ctrl->flags & 0xF0) {
+ case ISCSI_CTRL:
+ if (iser_ctrl->flags & ISER_RSV) {
+ read_stag = be32_to_cpu(iser_ctrl->read_stag);
+ read_va = be64_to_cpu(iser_ctrl->read_va);
+ isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
+ read_stag, (unsigned long long)read_va);
+ }
+ if (iser_ctrl->flags & ISER_WSV) {
+ write_stag = be32_to_cpu(iser_ctrl->write_stag);
+ write_va = be64_to_cpu(iser_ctrl->write_va);
+ isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
+ write_stag, (unsigned long long)write_va);
+ }
+
+ isert_dbg("ISER ISCSI_CTRL PDU\n");
+ break;
+ case ISER_HELLO:
+ isert_err("iSER Hello message\n");
+ break;
+ default:
+ isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
+ break;
+ }
+
+ isert_rx_opcode(isert_conn, rx_desc,
+ read_stag, read_va, write_stag, write_va);
+
+ ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+}
+
+static void
+isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct ib_device *ib_dev = isert_conn->device->ib_device;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "login recv");
+ return;
+ }
+
+ ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+
+ isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
+
+ if (isert_conn->conn) {
+ struct iscsi_login *login = isert_conn->conn->conn_login;
+
+ if (login && !login->first_request)
+ isert_rx_login_req(isert_conn);
+ }
+
+ mutex_lock(&isert_conn->mutex);
+ complete(&isert_conn->login_req_comp);
+ mutex_unlock(&isert_conn->mutex);
+
+ ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+}
+
+static void
+isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
+{
+ struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
+ enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
+
+ if (!cmd->rw.nr_ops)
+ return;
+
+ if (isert_prot_cmd(conn, se_cmd)) {
+ rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
+ conn->cm_id->port_num, se_cmd->t_data_sg,
+ se_cmd->t_data_nents, se_cmd->t_prot_sg,
+ se_cmd->t_prot_nents, dir);
+ } else {
+ rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
+ se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
+ }
+
+ cmd->rw.nr_ops = 0;
+}
+
+static void
+isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
+{
+ struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
+ struct isert_conn *isert_conn = isert_cmd->conn;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_text_rsp *hdr;
+
+ isert_dbg("Cmd %p\n", isert_cmd);
+
+ switch (cmd->iscsi_opcode) {
+ case ISCSI_OP_SCSI_CMD:
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del_init(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ iscsit_stop_dataout_timer(cmd);
+ /*
+ * Check for special case during comp_err where
+ * WRITE_PENDING has been handed off from core,
+ * but requires an extra target_put_sess_cmd()
+ * before transport_generic_free_cmd() below.
+ */
+ if (comp_err &&
+ cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+
+ target_put_sess_cmd(se_cmd);
+ }
+ }
+
+ isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+ break;
+ case ISCSI_OP_SCSI_TMFUNC:
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del_init(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+ break;
+ case ISCSI_OP_REJECT:
+ case ISCSI_OP_NOOP_OUT:
+ case ISCSI_OP_TEXT:
+ hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
+ /* If the continue bit is on, keep the command alive */
+ if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
+ break;
+
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del_init(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ /*
+ * Handle special case for REJECT when iscsi_add_reject*() has
+ * overwritten the original iscsi_opcode assignment, and the
+ * associated cmd->se_cmd needs to be released.
+ */
+ if (cmd->se_cmd.se_tfo != NULL) {
+ isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
+ cmd->iscsi_opcode);
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+ break;
+ }
+ /* fall through */
+ default:
+ iscsit_release_cmd(cmd);
+ break;
+ }
+}
+
+static void
+isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
+{
+ if (tx_desc->dma_addr != 0) {
+ isert_dbg("unmap single for tx_desc->dma_addr\n");
+ ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ tx_desc->dma_addr = 0;
+ }
+}
+
+static void
+isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
+ struct ib_device *ib_dev, bool comp_err)
+{
+ if (isert_cmd->pdu_buf_dma != 0) {
+ isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
+ ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
+ isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
+ isert_cmd->pdu_buf_dma = 0;
+ }
+
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+ isert_put_cmd(isert_cmd, comp_err);
+}
+
+static int
+isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
+{
+ struct ib_mr_status mr_status;
+ int ret;
+
+ ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
+ if (ret) {
+ isert_err("ib_check_mr_status failed, ret %d\n", ret);
+ goto fail_mr_status;
+ }
+
+ if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
+ u64 sec_offset_err;
+ u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
+
+ switch (mr_status.sig_err.err_type) {
+ case IB_SIG_BAD_GUARD:
+ se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
+ break;
+ case IB_SIG_BAD_REFTAG:
+ se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
+ break;
+ case IB_SIG_BAD_APPTAG:
+ se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
+ break;
+ }
+ sec_offset_err = mr_status.sig_err.sig_err_offset;
+ do_div(sec_offset_err, block_size);
+ se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
+
+ isert_err("PI error found type %d at sector 0x%llx "
+ "expected 0x%x vs actual 0x%x\n",
+ mr_status.sig_err.err_type,
+ (unsigned long long)se_cmd->bad_sector,
+ mr_status.sig_err.expected,
+ mr_status.sig_err.actual);
+ ret = 1;
+ }
+
+fail_mr_status:
+ return ret;
+}
+
+static void
+isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct isert_device *device = isert_conn->device;
+ struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
+ struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
+ struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
+ int ret = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "rdma write");
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ isert_completion_put(desc, isert_cmd, device->ib_device, true);
+ return;
+ }
+
+ isert_dbg("Cmd %p\n", isert_cmd);
+
+ ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
+ isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
+
+ if (ret) {
+ /*
+ * transport_generic_request_failure() expects to have
+ * plus two references to handle queue-full, so re-add
+ * one here as target-core will have already dropped
+ * it after the first isert_put_datain() callback.
+ */
+ kref_get(&cmd->cmd_kref);
+ transport_generic_request_failure(cmd, cmd->pi_err);
+ } else {
+ /*
+ * XXX: isert_put_response() failure is not retried.
+ */
+ ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
+ if (ret)
+ pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
+ }
+}
+
+static void
+isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct isert_device *device = isert_conn->device;
+ struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
+ struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
+ struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ int ret = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "rdma read");
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ isert_completion_put(desc, isert_cmd, device->ib_device, true);
+ return;
+ }
+
+ isert_dbg("Cmd %p\n", isert_cmd);
+
+ iscsit_stop_dataout_timer(cmd);
+
+ if (isert_prot_cmd(isert_conn, se_cmd))
+ ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
+ isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
+ cmd->write_data_done = 0;
+
+ isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+ cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+ spin_unlock_bh(&cmd->istate_lock);
+
+ /*
+ * transport_generic_request_failure() will drop the extra
+ * se_cmd->cmd_kref reference after T10-PI error, and handle
+ * any non-zero ->queue_status() callback error retries.
+ */
+ if (ret)
+ transport_generic_request_failure(se_cmd, se_cmd->pi_err);
+ else
+ target_execute_cmd(se_cmd);
+}
+
+static void
+isert_do_control_comp(struct work_struct *work)
+{
+ struct isert_cmd *isert_cmd = container_of(work,
+ struct isert_cmd, comp_work);
+ struct isert_conn *isert_conn = isert_cmd->conn;
+ struct ib_device *ib_dev = isert_conn->cm_id->device;
+ struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
+
+ isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
+
+ switch (cmd->i_state) {
+ case ISTATE_SEND_TASKMGTRSP:
+ iscsit_tmr_post_handler(cmd, cmd->conn);
+ /* fall through */
+ case ISTATE_SEND_REJECT:
+ case ISTATE_SEND_TEXTRSP:
+ cmd->i_state = ISTATE_SENT_STATUS;
+ isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
+ ib_dev, false);
+ break;
+ case ISTATE_SEND_LOGOUTRSP:
+ iscsit_logout_post_handler(cmd, cmd->conn);
+ break;
+ default:
+ isert_err("Unknown i_state %d\n", cmd->i_state);
+ dump_stack();
+ break;
+ }
+}
+
+static void
+isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct ib_device *ib_dev = isert_conn->cm_id->device;
+ struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "login send");
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ }
+
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+}
+
+static void
+isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct isert_conn *isert_conn = wc->qp->qp_context;
+ struct ib_device *ib_dev = isert_conn->cm_id->device;
+ struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
+ struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ isert_print_wc(wc, "send");
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
+ isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
+ return;
+ }
+
+ isert_dbg("Cmd %p\n", isert_cmd);
+
+ switch (isert_cmd->iscsi_cmd->i_state) {
+ case ISTATE_SEND_TASKMGTRSP:
+ case ISTATE_SEND_LOGOUTRSP:
+ case ISTATE_SEND_REJECT:
+ case ISTATE_SEND_TEXTRSP:
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+
+ INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
+ queue_work(isert_comp_wq, &isert_cmd->comp_work);
+ return;
+ default:
+ isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
+ isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
+ break;
+ }
+}
+
+static int
+isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
+{
+ int ret;
+
+ ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
+ if (ret) {
+ isert_err("ib_post_recv failed with %d\n", ret);
+ return ret;
+ }
+
+ ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
+ if (ret) {
+ isert_err("ib_post_send failed with %d\n", ret);
+ return ret;
+ }
+ return ret;
+}
+
+static int
+isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+ struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
+ &isert_cmd->tx_desc.iscsi_header;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ iscsit_build_rsp_pdu(cmd, conn, true, hdr);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ /*
+ * Attach SENSE DATA payload to iSCSI Response PDU
+ */
+ if (cmd->se_cmd.sense_buffer &&
+ ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
+ (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
+ u32 padding, pdu_len;
+
+ put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
+ cmd->sense_buffer);
+ cmd->se_cmd.scsi_sense_length += sizeof(__be16);
+
+ padding = -(cmd->se_cmd.scsi_sense_length) & 3;
+ hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
+ pdu_len = cmd->se_cmd.scsi_sense_length + padding;
+
+ isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
+ (void *)cmd->sense_buffer, pdu_len,
+ DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
+ return -ENOMEM;
+
+ isert_cmd->pdu_buf_len = pdu_len;
+ tx_dsg->addr = isert_cmd->pdu_buf_dma;
+ tx_dsg->length = pdu_len;
+ tx_dsg->lkey = device->pd->local_dma_lkey;
+ isert_cmd->tx_desc.num_sge = 2;
+ }
+
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("Posting SCSI Response\n");
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static void
+isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del_init(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (cmd->data_direction == DMA_TO_DEVICE)
+ iscsit_stop_dataout_timer(cmd);
+ isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
+}
+
+static enum target_prot_op
+isert_get_sup_prot_ops(struct iscsi_conn *conn)
+{
+ struct isert_conn *isert_conn = conn->context;
+ struct isert_device *device = isert_conn->device;
+
+ if (conn->tpg->tpg_attrib.t10_pi) {
+ if (device->pi_capable) {
+ isert_info("conn %p PI offload enabled\n", isert_conn);
+ isert_conn->pi_support = true;
+ return TARGET_PROT_ALL;
+ }
+ }
+
+ isert_info("conn %p PI offload disabled\n", isert_conn);
+ isert_conn->pi_support = false;
+
+ return TARGET_PROT_NORMAL;
+}
+
+static int
+isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ bool nopout_response)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
+ &isert_cmd->tx_desc.iscsi_header,
+ nopout_response);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
+ &isert_cmd->tx_desc.iscsi_header);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("conn %p Posting Logout Response\n", isert_conn);
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
+ &isert_cmd->tx_desc.iscsi_header);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
+ struct iscsi_reject *hdr =
+ (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ iscsit_build_reject(cmd, conn, hdr);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+
+ hton24(hdr->dlength, ISCSI_HDR_LEN);
+ isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
+ (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
+ DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
+ return -ENOMEM;
+ isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
+ tx_dsg->addr = isert_cmd->pdu_buf_dma;
+ tx_dsg->length = ISCSI_HDR_LEN;
+ tx_dsg->lkey = device->pd->local_dma_lkey;
+ isert_cmd->tx_desc.num_sge = 2;
+
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("conn %p Posting Reject\n", isert_conn);
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+ struct iscsi_text_rsp *hdr =
+ (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
+ u32 txt_rsp_len;
+ int rc;
+
+ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+ rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
+ if (rc < 0)
+ return rc;
+
+ txt_rsp_len = rc;
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+
+ if (txt_rsp_len) {
+ struct isert_device *device = isert_conn->device;
+ struct ib_device *ib_dev = device->ib_device;
+ struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
+ void *txt_rsp_buf = cmd->buf_ptr;
+
+ isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
+ txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
+ return -ENOMEM;
+
+ isert_cmd->pdu_buf_len = txt_rsp_len;
+ tx_dsg->addr = isert_cmd->pdu_buf_dma;
+ tx_dsg->length = txt_rsp_len;
+ tx_dsg->lkey = device->pd->local_dma_lkey;
+ isert_cmd->tx_desc.num_sge = 2;
+ }
+ isert_init_send_wr(isert_conn, isert_cmd, send_wr);
+
+ isert_dbg("conn %p Text Response\n", isert_conn);
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static inline void
+isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
+ struct ib_sig_domain *domain)
+{
+ domain->sig_type = IB_SIG_TYPE_T10_DIF;
+ domain->sig.dif.bg_type = IB_T10DIF_CRC;
+ domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
+ domain->sig.dif.ref_tag = se_cmd->reftag_seed;
+ /*
+ * At the moment we hard code those, but if in the future
+ * the target core would like to use it, we will take it
+ * from se_cmd.
+ */
+ domain->sig.dif.apptag_check_mask = 0xffff;
+ domain->sig.dif.app_escape = true;
+ domain->sig.dif.ref_escape = true;
+ if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
+ se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
+ domain->sig.dif.ref_remap = true;
+};
+
+static int
+isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
+{
+ memset(sig_attrs, 0, sizeof(*sig_attrs));
+
+ switch (se_cmd->prot_op) {
+ case TARGET_PROT_DIN_INSERT:
+ case TARGET_PROT_DOUT_STRIP:
+ sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
+ isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
+ break;
+ case TARGET_PROT_DOUT_INSERT:
+ case TARGET_PROT_DIN_STRIP:
+ sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
+ isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
+ break;
+ case TARGET_PROT_DIN_PASS:
+ case TARGET_PROT_DOUT_PASS:
+ isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
+ isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
+ break;
+ default:
+ isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
+ return -EINVAL;
+ }
+
+ if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
+ sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
+ if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
+ sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
+ if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
+ sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
+
+ return 0;
+}
+
+static int
+isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
+ struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
+{
+ struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
+ enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
+ u8 port_num = conn->cm_id->port_num;
+ u64 addr;
+ u32 rkey, offset;
+ int ret;
+
+ if (cmd->ctx_init_done)
+ goto rdma_ctx_post;
+
+ if (dir == DMA_FROM_DEVICE) {
+ addr = cmd->write_va;
+ rkey = cmd->write_stag;
+ offset = cmd->iscsi_cmd->write_data_done;
+ } else {
+ addr = cmd->read_va;
+ rkey = cmd->read_stag;
+ offset = 0;
+ }
+
+ if (isert_prot_cmd(conn, se_cmd)) {
+ struct ib_sig_attrs sig_attrs;
+
+ ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
+ if (ret)
+ return ret;
+
+ WARN_ON_ONCE(offset);
+ ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
+ se_cmd->t_data_sg, se_cmd->t_data_nents,
+ se_cmd->t_prot_sg, se_cmd->t_prot_nents,
+ &sig_attrs, addr, rkey, dir);
+ } else {
+ ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
+ se_cmd->t_data_sg, se_cmd->t_data_nents,
+ offset, addr, rkey, dir);
+ }
+
+ if (ret < 0) {
+ isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
+ return ret;
+ }
+
+ cmd->ctx_init_done = true;
+
+rdma_ctx_post:
+ ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
+ if (ret < 0)
+ isert_err("Cmd: %p failed to post RDMA res\n", cmd);
+ return ret;
+}
+
+static int
+isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_cqe *cqe = NULL;
+ struct ib_send_wr *chain_wr = NULL;
+ int rc;
+
+ isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
+ isert_cmd, se_cmd->data_length);
+
+ if (isert_prot_cmd(isert_conn, se_cmd)) {
+ isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
+ cqe = &isert_cmd->tx_desc.tx_cqe;
+ } else {
+ /*
+ * Build isert_conn->tx_desc for iSCSI response PDU and attach
+ */
+ isert_create_send_desc(isert_conn, isert_cmd,
+ &isert_cmd->tx_desc);
+ iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
+ &isert_cmd->tx_desc.iscsi_header);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ isert_init_send_wr(isert_conn, isert_cmd,
+ &isert_cmd->tx_desc.send_wr);
+
+ rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
+ if (rc) {
+ isert_err("ib_post_recv failed with %d\n", rc);
+ return rc;
+ }
+
+ chain_wr = &isert_cmd->tx_desc.send_wr;
+ }
+
+ rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
+ isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
+ isert_cmd, rc);
+ return rc;
+}
+
+static int
+isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ int ret;
+
+ isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
+ isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
+
+ isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
+ ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
+ &isert_cmd->tx_desc.tx_cqe, NULL);
+
+ isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
+ isert_cmd, ret);
+ return ret;
+}
+
+static int
+isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+ int ret = 0;
+
+ switch (state) {
+ case ISTATE_REMOVE:
+ spin_lock_bh(&conn->cmd_lock);
+ list_del_init(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+ isert_put_cmd(isert_cmd, true);
+ break;
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ ret = isert_put_nopin(cmd, conn, false);
+ break;
+ default:
+ isert_err("Unknown immediate state: 0x%02x\n", state);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int
+isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+ struct isert_conn *isert_conn = conn->context;
+ int ret;
+
+ switch (state) {
+ case ISTATE_SEND_LOGOUTRSP:
+ ret = isert_put_logout_rsp(cmd, conn);
+ if (!ret)
+ isert_conn->logout_posted = true;
+ break;
+ case ISTATE_SEND_NOPIN:
+ ret = isert_put_nopin(cmd, conn, true);
+ break;
+ case ISTATE_SEND_TASKMGTRSP:
+ ret = isert_put_tm_rsp(cmd, conn);
+ break;
+ case ISTATE_SEND_REJECT:
+ ret = isert_put_reject(cmd, conn);
+ break;
+ case ISTATE_SEND_TEXTRSP:
+ ret = isert_put_text_rsp(cmd, conn);
+ break;
+ case ISTATE_SEND_STATUS:
+ /*
+ * Special case for sending non GOOD SCSI status from TX thread
+ * context during pre se_cmd excecution failure.
+ */
+ ret = isert_put_response(conn, cmd);
+ break;
+ default:
+ isert_err("Unknown response state: 0x%02x\n", state);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+struct rdma_cm_id *
+isert_setup_id(struct isert_np *isert_np)
+{
+ struct iscsi_np *np = isert_np->np;
+ struct rdma_cm_id *id;
+ struct sockaddr *sa;
+ int ret;
+
+ sa = (struct sockaddr *)&np->np_sockaddr;
+ isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
+
+ id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(id)) {
+ isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
+ ret = PTR_ERR(id);
+ goto out;
+ }
+ isert_dbg("id %p context %p\n", id, id->context);
+
+ ret = rdma_bind_addr(id, sa);
+ if (ret) {
+ isert_err("rdma_bind_addr() failed: %d\n", ret);
+ goto out_id;
+ }
+
+ ret = rdma_listen(id, 0);
+ if (ret) {
+ isert_err("rdma_listen() failed: %d\n", ret);
+ goto out_id;
+ }
+
+ return id;
+out_id:
+ rdma_destroy_id(id);
+out:
+ return ERR_PTR(ret);
+}
+
+static int
+isert_setup_np(struct iscsi_np *np,
+ struct sockaddr_storage *ksockaddr)
+{
+ struct isert_np *isert_np;
+ struct rdma_cm_id *isert_lid;
+ int ret;
+
+ isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
+ if (!isert_np)
+ return -ENOMEM;
+
+ sema_init(&isert_np->sem, 0);
+ mutex_init(&isert_np->mutex);
+ INIT_LIST_HEAD(&isert_np->accepted);
+ INIT_LIST_HEAD(&isert_np->pending);
+ isert_np->np = np;
+
+ /*
+ * Setup the np->np_sockaddr from the passed sockaddr setup
+ * in iscsi_target_configfs.c code..
+ */
+ memcpy(&np->np_sockaddr, ksockaddr,
+ sizeof(struct sockaddr_storage));
+
+ isert_lid = isert_setup_id(isert_np);
+ if (IS_ERR(isert_lid)) {
+ ret = PTR_ERR(isert_lid);
+ goto out;
+ }
+
+ isert_np->cm_id = isert_lid;
+ np->np_context = isert_np;
+
+ return 0;
+
+out:
+ kfree(isert_np);
+
+ return ret;
+}
+
+static int
+isert_rdma_accept(struct isert_conn *isert_conn)
+{
+ struct rdma_cm_id *cm_id = isert_conn->cm_id;
+ struct rdma_conn_param cp;
+ int ret;
+ struct iser_cm_hdr rsp_hdr;
+
+ memset(&cp, 0, sizeof(struct rdma_conn_param));
+ cp.initiator_depth = isert_conn->initiator_depth;
+ cp.retry_count = 7;
+ cp.rnr_retry_count = 7;
+
+ memset(&rsp_hdr, 0, sizeof(rsp_hdr));
+ rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
+ if (!isert_conn->snd_w_inv)
+ rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
+ cp.private_data = (void *)&rsp_hdr;
+ cp.private_data_len = sizeof(rsp_hdr);
+
+ ret = rdma_accept(cm_id, &cp);
+ if (ret) {
+ isert_err("rdma_accept() failed with: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
+{
+ struct isert_conn *isert_conn = conn->context;
+ int ret;
+
+ isert_info("before login_req comp conn: %p\n", isert_conn);
+ ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
+ if (ret) {
+ isert_err("isert_conn %p interrupted before got login req\n",
+ isert_conn);
+ return ret;
+ }
+ reinit_completion(&isert_conn->login_req_comp);
+
+ /*
+ * For login requests after the first PDU, isert_rx_login_req() will
+ * kick schedule_delayed_work(&conn->login_work) as the packet is
+ * received, which turns this callback from iscsi_target_do_login_rx()
+ * into a NOP.
+ */
+ if (!login->first_request)
+ return 0;
+
+ isert_rx_login_req(isert_conn);
+
+ isert_info("before login_comp conn: %p\n", conn);
+ ret = wait_for_completion_interruptible(&isert_conn->login_comp);
+ if (ret)
+ return ret;
+
+ isert_info("processing login->req: %p\n", login->req);
+
+ return 0;
+}
+
+static void
+isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
+ struct isert_conn *isert_conn)
+{
+ struct rdma_cm_id *cm_id = isert_conn->cm_id;
+ struct rdma_route *cm_route = &cm_id->route;
+
+ conn->login_family = np->np_sockaddr.ss_family;
+
+ conn->login_sockaddr = cm_route->addr.dst_addr;
+ conn->local_sockaddr = cm_route->addr.src_addr;
+}
+
+static int
+isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
+{
+ struct isert_np *isert_np = np->np_context;
+ struct isert_conn *isert_conn;
+ int ret;
+
+accept_wait:
+ ret = down_interruptible(&isert_np->sem);
+ if (ret)
+ return -ENODEV;
+
+ spin_lock_bh(&np->np_thread_lock);
+ if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
+ spin_unlock_bh(&np->np_thread_lock);
+ isert_dbg("np_thread_state %d\n",
+ np->np_thread_state);
+ /**
+ * No point in stalling here when np_thread
+ * is in state RESET/SHUTDOWN/EXIT - bail
+ **/
+ return -ENODEV;
+ }
+ spin_unlock_bh(&np->np_thread_lock);
+
+ mutex_lock(&isert_np->mutex);
+ if (list_empty(&isert_np->pending)) {
+ mutex_unlock(&isert_np->mutex);
+ goto accept_wait;
+ }
+ isert_conn = list_first_entry(&isert_np->pending,
+ struct isert_conn, node);
+ list_del_init(&isert_conn->node);
+ mutex_unlock(&isert_np->mutex);
+
+ conn->context = isert_conn;
+ isert_conn->conn = conn;
+ isert_conn->state = ISER_CONN_BOUND;
+
+ isert_set_conn_info(np, conn, isert_conn);
+
+ isert_dbg("Processing isert_conn: %p\n", isert_conn);
+
+ return 0;
+}
+
+static void
+isert_free_np(struct iscsi_np *np)
+{
+ struct isert_np *isert_np = np->np_context;
+ struct isert_conn *isert_conn, *n;
+
+ if (isert_np->cm_id)
+ rdma_destroy_id(isert_np->cm_id);
+
+ /*
+ * FIXME: At this point we don't have a good way to insure
+ * that at this point we don't have hanging connections that
+ * completed RDMA establishment but didn't start iscsi login
+ * process. So work-around this by cleaning up what ever piled
+ * up in accepted and pending lists.
+ */
+ mutex_lock(&isert_np->mutex);
+ if (!list_empty(&isert_np->pending)) {
+ isert_info("Still have isert pending connections\n");
+ list_for_each_entry_safe(isert_conn, n,
+ &isert_np->pending,
+ node) {
+ isert_info("cleaning isert_conn %p state (%d)\n",
+ isert_conn, isert_conn->state);
+ isert_connect_release(isert_conn);
+ }
+ }
+
+ if (!list_empty(&isert_np->accepted)) {
+ isert_info("Still have isert accepted connections\n");
+ list_for_each_entry_safe(isert_conn, n,
+ &isert_np->accepted,
+ node) {
+ isert_info("cleaning isert_conn %p state (%d)\n",
+ isert_conn, isert_conn->state);
+ isert_connect_release(isert_conn);
+ }
+ }
+ mutex_unlock(&isert_np->mutex);
+
+ np->np_context = NULL;
+ kfree(isert_np);
+}
+
+static void isert_release_work(struct work_struct *work)
+{
+ struct isert_conn *isert_conn = container_of(work,
+ struct isert_conn,
+ release_work);
+
+ isert_info("Starting release conn %p\n", isert_conn);
+
+ mutex_lock(&isert_conn->mutex);
+ isert_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&isert_conn->mutex);
+
+ isert_info("Destroying conn %p\n", isert_conn);
+ isert_put_conn(isert_conn);
+}
+
+static void
+isert_wait4logout(struct isert_conn *isert_conn)
+{
+ struct iscsi_conn *conn = isert_conn->conn;
+
+ isert_info("conn %p\n", isert_conn);
+
+ if (isert_conn->logout_posted) {
+ isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
+ wait_for_completion_timeout(&conn->conn_logout_comp,
+ SECONDS_FOR_LOGOUT_COMP * HZ);
+ }
+}
+
+static void
+isert_wait4cmds(struct iscsi_conn *conn)
+{
+ isert_info("iscsi_conn %p\n", conn);
+
+ if (conn->sess) {
+ target_sess_cmd_list_set_waiting(conn->sess->se_sess);
+ target_wait_for_sess_cmds(conn->sess->se_sess);
+ }
+}
+
+/**
+ * isert_put_unsol_pending_cmds() - Drop commands waiting for
+ * unsolicitate dataout
+ * @conn: iscsi connection
+ *
+ * We might still have commands that are waiting for unsolicited
+ * dataouts messages. We must put the extra reference on those
+ * before blocking on the target_wait_for_session_cmds
+ */
+static void
+isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
+{
+ struct iscsi_cmd *cmd, *tmp;
+ static LIST_HEAD(drop_cmd_list);
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
+ if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
+ (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
+ (cmd->write_data_done < cmd->se_cmd.data_length))
+ list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+
+ list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
+ list_del_init(&cmd->i_conn_node);
+ if (cmd->i_state != ISTATE_REMOVE) {
+ struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+
+ isert_info("conn %p dropping cmd %p\n", conn, cmd);
+ isert_put_cmd(isert_cmd, true);
+ }
+ }
+}
+
+static void isert_wait_conn(struct iscsi_conn *conn)
+{
+ struct isert_conn *isert_conn = conn->context;
+
+ isert_info("Starting conn %p\n", isert_conn);
+
+ mutex_lock(&isert_conn->mutex);
+ isert_conn_terminate(isert_conn);
+ mutex_unlock(&isert_conn->mutex);
+
+ ib_drain_qp(isert_conn->qp);
+ isert_put_unsol_pending_cmds(conn);
+ isert_wait4cmds(conn);
+ isert_wait4logout(isert_conn);
+
+ queue_work(isert_release_wq, &isert_conn->release_work);
+}
+
+static void isert_free_conn(struct iscsi_conn *conn)
+{
+ struct isert_conn *isert_conn = conn->context;
+
+ ib_drain_qp(isert_conn->qp);
+ isert_put_conn(isert_conn);
+}
+
+static void isert_get_rx_pdu(struct iscsi_conn *conn)
+{
+ struct completion comp;
+
+ init_completion(&comp);
+
+ wait_for_completion_interruptible(&comp);
+}
+
+static struct iscsit_transport iser_target_transport = {
+ .name = "IB/iSER",
+ .transport_type = ISCSI_INFINIBAND,
+ .rdma_shutdown = true,
+ .priv_size = sizeof(struct isert_cmd),
+ .owner = THIS_MODULE,
+ .iscsit_setup_np = isert_setup_np,
+ .iscsit_accept_np = isert_accept_np,
+ .iscsit_free_np = isert_free_np,
+ .iscsit_wait_conn = isert_wait_conn,
+ .iscsit_free_conn = isert_free_conn,
+ .iscsit_get_login_rx = isert_get_login_rx,
+ .iscsit_put_login_tx = isert_put_login_tx,
+ .iscsit_immediate_queue = isert_immediate_queue,
+ .iscsit_response_queue = isert_response_queue,
+ .iscsit_get_dataout = isert_get_dataout,
+ .iscsit_queue_data_in = isert_put_datain,
+ .iscsit_queue_status = isert_put_response,
+ .iscsit_aborted_task = isert_aborted_task,
+ .iscsit_get_rx_pdu = isert_get_rx_pdu,
+ .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
+};
+
+static int __init isert_init(void)
+{
+ int ret;
+
+ isert_comp_wq = alloc_workqueue("isert_comp_wq",
+ WQ_UNBOUND | WQ_HIGHPRI, 0);
+ if (!isert_comp_wq) {
+ isert_err("Unable to allocate isert_comp_wq\n");
+ return -ENOMEM;
+ }
+
+ isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
+ WQ_UNBOUND_MAX_ACTIVE);
+ if (!isert_release_wq) {
+ isert_err("Unable to allocate isert_release_wq\n");
+ ret = -ENOMEM;
+ goto destroy_comp_wq;
+ }
+
+ iscsit_register_transport(&iser_target_transport);
+ isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
+
+ return 0;
+
+destroy_comp_wq:
+ destroy_workqueue(isert_comp_wq);
+
+ return ret;
+}
+
+static void __exit isert_exit(void)
+{
+ flush_scheduled_work();
+ destroy_workqueue(isert_release_wq);
+ destroy_workqueue(isert_comp_wq);
+ iscsit_unregister_transport(&iser_target_transport);
+ isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
+}
+
+MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(isert_init);
+module_exit(isert_exit);
diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
new file mode 100644
index 000000000..3b296bac4
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+#include <scsi/iser.h>
+
+
+#define DRV_NAME "isert"
+#define PFX DRV_NAME ": "
+
+#define isert_dbg(fmt, arg...) \
+ do { \
+ if (unlikely(isert_debug_level > 2)) \
+ printk(KERN_DEBUG PFX "%s: " fmt,\
+ __func__ , ## arg); \
+ } while (0)
+
+#define isert_warn(fmt, arg...) \
+ do { \
+ if (unlikely(isert_debug_level > 0)) \
+ pr_warn(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define isert_info(fmt, arg...) \
+ do { \
+ if (unlikely(isert_debug_level > 1)) \
+ pr_info(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define isert_err(fmt, arg...) \
+ pr_err(PFX "%s: " fmt, __func__ , ## arg)
+
+/* Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + \
+ sizeof(struct iscsi_hdr))
+#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISERT_MAX_TX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
+
+#define ISERT_MAX_RX_MISC_PDUS 6 /*
+ * NOOP_OUT(2), TEXT(1),
+ * SCSI_TMFUNC(2), LOGOUT(1)
+ */
+
+#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */
+
+#define ISERT_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
+
+#define ISERT_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
+
+#define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
+ ISERT_MAX_TX_MISC_PDUS + \
+ ISERT_MAX_RX_MISC_PDUS)
+
+#define ISER_RX_PAD_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \
+ (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \
+ sizeof(struct ib_cqe) + sizeof(bool)))
+
+#define ISCSI_ISER_SG_TABLESIZE 256
+
+enum isert_desc_type {
+ ISCSI_TX_CONTROL,
+ ISCSI_TX_DATAIN
+};
+
+enum iser_conn_state {
+ ISER_CONN_INIT,
+ ISER_CONN_UP,
+ ISER_CONN_BOUND,
+ ISER_CONN_FULL_FEATURE,
+ ISER_CONN_TERMINATING,
+ ISER_CONN_DOWN,
+};
+
+struct iser_rx_desc {
+ struct iser_ctrl iser_header;
+ struct iscsi_hdr iscsi_header;
+ char data[ISCSI_DEF_MAX_RECV_SEG_LEN];
+ u64 dma_addr;
+ struct ib_sge rx_sg;
+ struct ib_cqe rx_cqe;
+ bool in_use;
+ char pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
+{
+ return container_of(cqe, struct iser_rx_desc, rx_cqe);
+}
+
+struct iser_tx_desc {
+ struct iser_ctrl iser_header;
+ struct iscsi_hdr iscsi_header;
+ enum isert_desc_type type;
+ u64 dma_addr;
+ struct ib_sge tx_sg[2];
+ struct ib_cqe tx_cqe;
+ int num_sge;
+ struct ib_send_wr send_wr;
+} __packed;
+
+static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
+{
+ return container_of(cqe, struct iser_tx_desc, tx_cqe);
+}
+
+struct isert_cmd {
+ uint32_t read_stag;
+ uint32_t write_stag;
+ uint64_t read_va;
+ uint64_t write_va;
+ uint32_t inv_rkey;
+ u64 pdu_buf_dma;
+ u32 pdu_buf_len;
+ struct isert_conn *conn;
+ struct iscsi_cmd *iscsi_cmd;
+ struct iser_tx_desc tx_desc;
+ struct iser_rx_desc *rx_desc;
+ struct rdma_rw_ctx rw;
+ struct work_struct comp_work;
+ struct scatterlist sg;
+ bool ctx_init_done;
+};
+
+static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
+{
+ return container_of(desc, struct isert_cmd, tx_desc);
+}
+
+struct isert_device;
+
+struct isert_conn {
+ enum iser_conn_state state;
+ u32 responder_resources;
+ u32 initiator_depth;
+ bool pi_support;
+ struct iser_rx_desc *login_req_buf;
+ char *login_rsp_buf;
+ u64 login_req_dma;
+ int login_req_len;
+ u64 login_rsp_dma;
+ struct iser_rx_desc *rx_descs;
+ struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS];
+ struct iscsi_conn *conn;
+ struct list_head node;
+ struct completion login_comp;
+ struct completion login_req_comp;
+ struct iser_tx_desc login_tx_desc;
+ struct rdma_cm_id *cm_id;
+ struct ib_qp *qp;
+ struct isert_device *device;
+ struct mutex mutex;
+ struct kref kref;
+ struct work_struct release_work;
+ bool logout_posted;
+ bool snd_w_inv;
+ wait_queue_head_t rem_wait;
+ bool dev_removed;
+};
+
+#define ISERT_MAX_CQ 64
+
+/**
+ * struct isert_comp - iSER completion context
+ *
+ * @device: pointer to device handle
+ * @cq: completion queue
+ * @active_qps: Number of active QPs attached
+ * to completion context
+ */
+struct isert_comp {
+ struct isert_device *device;
+ struct ib_cq *cq;
+ int active_qps;
+};
+
+struct isert_device {
+ bool pi_capable;
+ int refcount;
+ struct ib_device *ib_device;
+ struct ib_pd *pd;
+ struct isert_comp *comps;
+ int comps_used;
+ struct list_head dev_node;
+};
+
+struct isert_np {
+ struct iscsi_np *np;
+ struct semaphore sem;
+ struct rdma_cm_id *cm_id;
+ struct mutex mutex;
+ struct list_head accepted;
+ struct list_head pending;
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 16:36:02 +0000