[RFC-v3 9/9] iser-target: Add iSCSI Extensions for RDMA (iSER) target driver

Nicholas A. Bellinger
2013-04-04T07:36:32Z

This patch adds support for iSCSI Extensions for RDMA target mode,
and includes CQ pooling per isert_device context distributed across
multiple active iser target sessions.

It also uses cmwq process context for RX / TX ib_post_cq() polling
via isert_cq_desc->cq_[rx,tx]_work invoked by isert_cq_[rx,tx]_callback()
hardIRQ context callbacks.

v3 changes:

- Convert to use per isert_cq_desc->cq_[rx,tx]_work + drop tasklets (Or + nab)
- Move IB_EVENT_QP_LAST_WQE_REACHED warn into correct
isert_qp_event_callback (Or)
- Drop unnecessary IB_ACCESS_REMOTE_* access flag usage in
isert_create_device_ib_res (Or)
- Add common isert_init_send_wr(), and convert isert_put_* calls (Or)
- Move to verbs+core logic to single ib_isert.[c,h] (Or + nab)
- Add kmem_cache isert_cmd_cache usage for descriptor allocation (nab)
- Move common ib_post_send() logic used by isert_put_*() to
isert_post_response() (nab)
- Add isert_put_reject call in isert_response_queue() for posting
ISCSI_REJECT response. (nab)
- Add ISTATE_SEND_REJECT checking in isert_do_control_comp. (nab)

v2 changes:

- Drop unused ISERT_ADDR_ROUTE_TIMEOUT define
- Add rdma_notify() call for IB_EVENT_COMM_EST in isert_qp_event_callback()
- Make isert_query_device() less verbose
- Drop unused RDMA_CM_EVENT_ADDR_ERROR and RDMA_CM_EVENT_ROUTE_ERROR
cases from isert_cma_handler()
- Drop unused rdma/ib_fmr_pool.h include
- Update isert_conn_setup_qp() to assign cq based upon least used
- Add isert_create_device_ib_res() to setup PD, CQs and MRs for each
underlying struct ib_device, instead of using per isert_conn resources.
- Add isert_free_device_ib_res() to release PD, CQs and MRs for each
underlying struct ib_device.
- Add isert_device_find_by_ib_dev()
- Change isert_connect_request() to drop PD, CQs and MRs allocation,
and use isert_device_find_by_ib_dev() instead.
- Add isert_device_try_release()
- Change isert_connect_release() to decrement cq_active_qps, and drop
PD, CQs and MRs resource release.
- Update isert_connect_release() to call isert_device_try_release()
- Make isert_create_device_ib_res() determine device->cqs_used based
upon num_online_cpus()
- Drop misleading isert_dump_ib_wc() usage
- Drop unused rdma/ib_fmr_pool.h include
- Use proper xfer_len for login PDUs in isert_rx_completion()
- Add isert_release_cmd() usage
- Change isert_alloc_cmd() to setup iscsi_cmd.release_cmd() pointer
- Change isert_put_cmd() to perform per iscsi_opcode specific release
logic
- Add isert_unmap_cmd() call for ISCSI_OP_SCSI_CMD from isert_put_cmd()
- Change isert_send_completion() to call
atomic_dec(&isert_conn->post_send_buf_count)
based upon per iscsi_opcode logic
- Drop ISTATE_REMOVE processing from isert_immediate_queue()
- Drop ISTATE_SEND_DATAIN processing from isert_response_queue()
- Drop ISTATE_SEND_STATUS processing from isert_response_queue()
- Drop iscsit_transport->iscsit_unmap_cmd() and ->iscsit_free_cmd()
- Convert iser_cq_tx_tasklet() to use struct isert_cq_desc pooling logic
- Convert isert_cq_tx_callback() to use struct isert_cq_desc pooling
logic
- Convert iser_cq_rx_tasklet() to use struct isert_cq_desc pooling logic
- Convert isert_cq_rx_callback() to use struct isert_cq_desc pooling
logic
- Add explict iscsit_stop_dataout_timer() call to
isert_do_rdma_read_comp()
- Use isert_get_dataout() for iscsit_transport->iscsit_get_dataout()
caller
- Drop ISTATE_SEND_R2T processing from isert_immediate_queue()
- Drop unused rdma/ib_fmr_pool.h include
- Drop isert_cmd->cmd_kref in favor of se_cmd->cmd_kref usage
- Add struct isert_device in order to support multiple EQs + CQ pooling
- Add struct isert_cq_desc
- Drop tasklets and cqs from isert_conn
- Bump ISERT_MAX_CQ to 64
- Various minor checkpatch fixes

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/infiniband/Kconfig | 1 +
drivers/infiniband/Makefile | 1 +
drivers/infiniband/ulp/isert/Kconfig | 6 +
drivers/infiniband/ulp/isert/Makefile | 2 +
drivers/infiniband/ulp/isert/ib_isert.c | 2270 ++++++++++++++++++++++++++++
drivers/infiniband/ulp/isert/ib_isert.h | 142 ++
drivers/infiniband/ulp/isert/isert_proto.h | 47 +
7 files changed, 2469 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/ulp/isert/Kconfig
create mode 100644 drivers/infiniband/ulp/isert/Makefile
create mode 100644 drivers/infiniband/ulp/isert/ib_isert.c
create mode 100644 drivers/infiniband/ulp/isert/ib_isert.h
create mode 100644 drivers/infiniband/ulp/isert/isert_proto.h

diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index a0f29c1..c85b56c 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -59,5 +59,6 @@ source "drivers/infiniband/ulp/srp/Kconfig"
source "drivers/infiniband/ulp/srpt/Kconfig"

source "drivers/infiniband/ulp/iser/Kconfig"
+source "drivers/infiniband/ulp/isert/Kconfig"

endif # INFINIBAND
diff --git a/drivers/infiniband/Makefile b/drivers/infiniband/Makefile
index bf846a1..b126fef 100644
--- a/drivers/infiniband/Makefile
+++ b/drivers/infiniband/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/
obj-$(CONFIG_INFINIBAND_SRPT) += ulp/srpt/
obj-$(CONFIG_INFINIBAND_ISER) += ulp/iser/
+obj-$(CONFIG_INFINIBAND_ISERT) += ulp/isert/
diff --git a/drivers/infiniband/ulp/isert/Kconfig b/drivers/infiniband/ulp/isert/Kconfig
new file mode 100644
index 0000000..c268a3b
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/Kconfig
@@ -0,0 +1,6 @@
+config INFINIBAND_ISERT
+ tristate "InfiniBand iSCSI Extentions for RDMA (iSER) Target support"
+ depends on INFINIBAND && TARGET_CORE && ISCSI_TARGET
+ ---help---
+
+ Support for iSCSI Extentions for RDMA (iSER) Target on Infiniband fabrics.
diff --git a/drivers/infiniband/ulp/isert/Makefile b/drivers/infiniband/ulp/isert/Makefile
new file mode 100644
index 0000000..c8bf242
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/Makefile
@@ -0,0 +1,2 @@
+ccflags-y := -Idrivers/target -Idrivers/target/iscsi
+obj-$(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 0000000..3cf19f5
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -0,0 +1,2270 @@
+/*******************************************************************************
+ * This file contains iSCSI extentions for RDMA (iSER) Verbs
+ *
+ * (c) Copyright 2013 RisingTide Systems LLC.
+ *
+ * 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 "isert_proto.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 * ISERT_MAX_CONN)
+
+static DEFINE_MUTEX(device_list_mutex);
+static LIST_HEAD(device_list);
+static struct workqueue_struct *isert_rx_wq;
+static struct workqueue_struct *isert_comp_wq;
+static struct kmem_cache *isert_cmd_cache;
+
+static void
+isert_qp_event_callback(struct ib_event *e, void *context)
+{
+ struct isert_conn *isert_conn = (struct isert_conn *)context;
+
+ pr_err("isert_qp_event_callback event: %d\n", e->event);
+ switch (e->event) {
+ case IB_EVENT_COMM_EST:
+ rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
+ break;
+ case IB_EVENT_QP_LAST_WQE_REACHED:
+ pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
+ break;
+ default:
+ break;
+ }
+}
+
+static int
+isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
+{
+ int ret;
+
+ ret = ib_query_device(ib_dev, devattr);
+ if (ret) {
+ pr_err("ib_query_device() failed: %d\n", ret);
+ return ret;
+ }
+ pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
+ pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
+
+ return 0;
+}
+
+static int
+isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
+{
+ struct isert_device *device = isert_conn->conn_device;
+ struct ib_qp_init_attr attr;
+ struct ib_device_attr devattr;
+ int ret, index, min_index = 0;
+
+ memset(&devattr, 0, sizeof(struct ib_device_attr));
+ ret = isert_query_device(cma_id->device, &devattr);
+ if (ret)
+ return ret;
+
+ mutex_lock(&device_list_mutex);
+ for (index = 0; index < device->cqs_used; index++)
+ if (device->cq_active_qps[index] <
+ device->cq_active_qps[min_index])
+ min_index = index;
+ device->cq_active_qps[min_index]++;
+ pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
+ mutex_unlock(&device_list_mutex);
+
+ memset(&attr, 0, sizeof(struct ib_qp_init_attr));
+ attr.event_handler = isert_qp_event_callback;
+ attr.qp_context = isert_conn;
+ attr.send_cq = device->dev_tx_cq[min_index];
+ attr.recv_cq = device->dev_rx_cq[min_index];
+ attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
+ attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
+ /*
+ * FIXME: Use devattr.max_sge - 2 for max_send_sge as
+ * work-around for RDMA_READ..
+ */
+ attr.cap.max_send_sge = devattr.max_sge - 2;
+ isert_conn->max_sge = attr.cap.max_send_sge;
+
+ attr.cap.max_recv_sge = 1;
+ attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ attr.qp_type = IB_QPT_RC;
+
+ pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
+ cma_id->device);
+ pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
+ isert_conn->conn_pd->device);
+
+ ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
+ if (ret) {
+ pr_err("rdma_create_qp failed for cma_id %d\n", ret);
+ return ret;
+ }
+ isert_conn->conn_qp = cma_id->qp;
+ pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
+
+ return 0;
+}
+
+static void
+isert_cq_event_callback(struct ib_event *e, void *context)
+{
+ pr_debug("isert_cq_event_callback event: %d\n", e->event);
+}
+
+void isert_cq_tx_callback(struct ib_cq *, void *);
+void isert_cq_rx_callback(struct ib_cq *, void *);
+void isert_free_rx_descriptors(struct isert_conn *);
+
+static int
+isert_create_device_ib_res(struct isert_device *device)
+{
+ struct ib_device *ib_dev = device->ib_device;
+ struct isert_cq_desc *cq_desc;
+ int ret, i, j;
+
+ device->cqs_used = min_t(int, num_online_cpus(),
+ device->ib_device->num_comp_vectors);
+ device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
+ pr_debug("Using %d CQs, device %s supports %d vectors\n",
+ device->cqs_used, device->ib_device->name,
+ device->ib_device->num_comp_vectors);
+ device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
+ device->cqs_used, GFP_KERNEL);
+ if (!device->cq_desc) {
+ pr_err("Unable to allocate device->cq_desc\n");
+ return -ENOMEM;
+ }
+ cq_desc = device->cq_desc;
+
+ device->dev_pd = ib_alloc_pd(ib_dev);
+ if (IS_ERR(device->dev_pd)) {
+ ret = PTR_ERR(device->dev_pd);
+ pr_err("ib_alloc_pd failed for dev_pd: %d\n", ret);
+ goto out_cq_desc;
+ }
+
+ for (i = 0; i < device->cqs_used; i++) {
+ cq_desc[i].device = device;
+ cq_desc[i].cq_index = i;
+
+ device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
+ isert_cq_rx_callback,
+ isert_cq_event_callback,
+ (void *)&cq_desc[i],
+ ISER_MAX_RX_CQ_LEN, i);
+ if (IS_ERR(device->dev_rx_cq[i]))
+ goto out_cq;
+
+ device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
+ isert_cq_tx_callback,
+ isert_cq_event_callback,
+ (void *)&cq_desc[i],
+ ISER_MAX_TX_CQ_LEN, i);
+ if (IS_ERR(device->dev_tx_cq[i]))
+ goto out_cq;
+
+ if (ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP))
+ goto out_cq;
+
+ if (ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP))
+ goto out_cq;
+ }
+
+ device->dev_mr = ib_get_dma_mr(device->dev_pd, IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(device->dev_mr)) {
+ ret = PTR_ERR(device->dev_mr);
+ pr_err("ib_get_dma_mr failed for dev_mr: %d\n", ret);
+ goto out_cq;
+ }
+
+ return 0;
+
+out_cq:
+ for (j = 0; j < i; j++) {
+ cq_desc = &device->cq_desc[j];
+
+ if (device->dev_rx_cq[j]) {
+ cancel_work_sync(&cq_desc->cq_rx_work);
+ ib_destroy_cq(device->dev_rx_cq[j]);
+ }
+ if (device->dev_tx_cq[j]) {
+ cancel_work_sync(&cq_desc->cq_tx_work);
+ ib_destroy_cq(device->dev_tx_cq[j]);
+ }
+ }
+ ib_dealloc_pd(device->dev_pd);
+
+out_cq_desc:
+ kfree(device->cq_desc);
+
+ return ret;
+}
+
+static void
+isert_free_device_ib_res(struct isert_device *device)
+{
+ struct isert_cq_desc *cq_desc;
+ int i;
+
+ for (i = 0; i < device->cqs_used; i++) {
+ cq_desc = &device->cq_desc[i];
+
+ cancel_work_sync(&cq_desc->cq_rx_work);
+ cancel_work_sync(&cq_desc->cq_tx_work);
+ ib_destroy_cq(device->dev_rx_cq[i]);
+ ib_destroy_cq(device->dev_tx_cq[i]);
+ device->dev_rx_cq[i] = NULL;
+ device->dev_tx_cq[i] = NULL;
+ }
+
+ ib_dereg_mr(device->dev_mr);
+ ib_dealloc_pd(device->dev_pd);
+ kfree(device->cq_desc);
+}
+
+static void
+isert_device_try_release(struct isert_device *device)
+{
+ mutex_lock(&device_list_mutex);
+ 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_find_by_ib_dev(struct rdma_cm_id *cma_id)
+{
+ struct isert_device *device;
+
+ 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++;
+ mutex_unlock(&device_list_mutex);
+ return device;
+ }
+ }
+
+ device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
+ if (!device) {
+ mutex_unlock(&device_list_mutex);
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&device->dev_node);
+
+ device->ib_device = cma_id->device;
+ if (isert_create_device_ib_res(device)) {
+ kfree(device);
+ mutex_unlock(&device_list_mutex);
+ return NULL;
+ }
+
+ device->refcount++;
+ list_add_tail(&device->dev_node, &device_list);
+ mutex_unlock(&device_list_mutex);
+
+ return device;
+}
+
+static int
+isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ struct iscsi_np *np = cma_id->context;
+ struct isert_np *isert_np = np->np_context;
+ struct isert_conn *isert_conn;
+ struct isert_device *device;
+ struct ib_device *ib_dev = cma_id->device;
+ int ret;
+
+ pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
+ cma_id, cma_id->context);
+
+ isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
+ if (!isert_conn) {
+ pr_err("Unable to allocate isert_conn\n");
+ return -ENOMEM;
+ }
+ isert_conn->state = ISER_CONN_INIT;
+ INIT_LIST_HEAD(&isert_conn->conn_accept_node);
+ init_completion(&isert_conn->conn_login_comp);
+ init_waitqueue_head(&isert_conn->conn_wait);
+ kref_init(&isert_conn->conn_kref);
+ kref_get(&isert_conn->conn_kref);
+
+ cma_id->context = isert_conn;
+ isert_conn->conn_cm_id = cma_id;
+ isert_conn->responder_resources = event->param.conn.responder_resources;
+ isert_conn->initiator_depth = event->param.conn.initiator_depth;
+ pr_debug("Using responder_resources: %u initiator_depth: %u\n",
+ isert_conn->responder_resources, isert_conn->initiator_depth);
+
+ isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
+ ISER_RX_LOGIN_SIZE, GFP_KERNEL);
+ if (!isert_conn->login_buf) {
+ pr_err("Unable to allocate isert_conn->login_buf\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ isert_conn->login_req_buf = isert_conn->login_buf;
+ isert_conn->login_rsp_buf = isert_conn->login_buf +
+ ISCSI_DEF_MAX_RECV_SEG_LEN;
+ pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
+ isert_conn->login_buf, isert_conn->login_req_buf,
+ isert_conn->login_rsp_buf);
+
+ isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
+ (void *)isert_conn->login_req_buf,
+ ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
+
+ ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
+ if (ret) {
+ pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
+ ret);
+ isert_conn->login_req_dma = 0;
+ goto out_login_buf;
+ }
+
+ isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
+ (void *)isert_conn->login_rsp_buf,
+ ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+
+ ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
+ if (ret) {
+ pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
+ ret);
+ isert_conn->login_rsp_dma = 0;
+ goto out_req_dma_map;
+ }
+
+ device = isert_device_find_by_ib_dev(cma_id);
+ if (!device)
+ goto out_rsp_dma_map;
+
+ isert_conn->conn_device = device;
+ isert_conn->conn_pd = device->dev_pd;
+ isert_conn->conn_mr = device->dev_mr;
+
+ ret = isert_conn_setup_qp(isert_conn, cma_id);
+ if (ret)
+ goto out_conn_dev;
+
+ mutex_lock(&isert_np->np_accept_mutex);
+ list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
+ mutex_unlock(&isert_np->np_accept_mutex);
+
+ pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
+ wake_up(&isert_np->np_accept_wq);
+ return 0;
+
+out_conn_dev:
+ isert_device_try_release(device);
+out_rsp_dma_map:
+ ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
+ ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+out_req_dma_map:
+ ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
+out_login_buf:
+ kfree(isert_conn->login_buf);
+out:
+ kfree(isert_conn);
+ return ret;
+}
+
+static void
+isert_connect_release(struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_device *device = isert_conn->conn_device;
+ int cq_index;
+
+ pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+ if (isert_conn->conn_qp) {
+ cq_index = ((struct isert_cq_desc *)
+ isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
+ pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
+ isert_conn->conn_device->cq_active_qps[cq_index]--;
+
+ rdma_destroy_qp(isert_conn->conn_cm_id);
+ }
+
+ isert_free_rx_descriptors(isert_conn);
+
+ if (isert_conn->conn_cm_id != NULL)
+ rdma_destroy_id(isert_conn->conn_cm_id);
+
+ if (isert_conn->login_buf) {
+ ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
+ ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+ ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN,
+ DMA_FROM_DEVICE);
+ kfree(isert_conn->login_buf);
+ }
+ kfree(isert_conn);
+
+ if (device)
+ isert_device_try_release(device);
+
+ pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
+}
+
+static void
+isert_connected_handler(struct rdma_cm_id *cma_id)
+{
+ return;
+}
+
+static void
+isert_release_conn_kref(struct kref *kref)
+{
+ struct isert_conn *isert_conn = container_of(kref,
+ struct isert_conn, conn_kref);
+
+ pr_debug("Calling isert_connect_release for final kref %s/%d\n",
+ current->comm, current->pid);
+
+ isert_connect_release(isert_conn);
+}
+
+static void
+isert_put_conn(struct isert_conn *isert_conn)
+{
+ kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
+}
+
+static void
+isert_disconnect_work(struct work_struct *work)
+{
+ struct isert_conn *isert_conn = container_of(work,
+ struct isert_conn, conn_logout_work);
+
+ pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+ if (isert_conn->post_recv_buf_count == 0 &&
+ atomic_read(&isert_conn->post_send_buf_count) == 0) {
+ pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
+ isert_conn->state = ISER_CONN_DOWN;
+ wake_up(&isert_conn->conn_wait);
+ }
+
+ isert_put_conn(isert_conn);
+}
+
+static void
+isert_disconnected_handler(struct rdma_cm_id *cma_id)
+{
+ struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
+
+ INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
+ schedule_work(&isert_conn->conn_logout_work);
+}
+
+static int
+isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ int ret = 0;
+
+ pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
+ event->event, event->status, cma_id->context, cma_id);
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
+ ret = isert_connect_request(cma_id, event);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
+ isert_connected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
+ isert_disconnected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ break;
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ default:
+ pr_err("Unknown RDMA CMA event: %d\n", event->event);
+ break;
+ }
+
+ if (ret != 0) {
+ pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
+ event->event, ret);
+ dump_stack();
+ }
+
+ return ret;
+}
+
+static int
+isert_post_recv(struct isert_conn *isert_conn, u32 count)
+{
+ struct ib_recv_wr *rx_wr, *rx_wr_failed;
+ int i, ret;
+ unsigned int rx_head = isert_conn->conn_rx_desc_head;
+ struct isert_rx_desc *rx_desc;
+ struct iser_rx_desc *desc;
+
+ for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
+ rx_desc = &isert_conn->conn_rx_descs[rx_head];
+ desc = &rx_desc->desc;
+ rx_wr->wr_id = (unsigned long)desc;
+ rx_wr->sg_list = &desc->rx_sg;
+ rx_wr->num_sge = 1;
+ rx_wr->next = rx_wr + 1;
+ rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
+ }
+
+ rx_wr--;
+ rx_wr->next = NULL; /* mark end of work requests list */
+
+ isert_conn->post_recv_buf_count += count;
+ ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
+ &rx_wr_failed);
+ if (ret) {
+ pr_err("ib_post_recv() failed with ret: %d\n", ret);
+ isert_conn->post_recv_buf_count -= count;
+ } else {
+ pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
+ isert_conn->conn_rx_desc_head = rx_head;
+ }
+ return ret;
+}
+
+static int
+isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct ib_send_wr send_wr, *send_wr_failed;
+ int ret;
+
+ ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ send_wr.next = NULL;
+ send_wr.wr_id = (unsigned long)tx_desc;
+ 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;
+
+ atomic_inc(&isert_conn->post_send_buf_count);
+
+ ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
+ if (ret) {
+ pr_err("ib_post_send() failed, ret: %d\n", ret);
+ atomic_dec(&isert_conn->post_send_buf_count);
+ }
+
+ return ret;
+}
+
+static void
+isert_create_send_desc(struct isert_conn *isert_conn,
+ struct isert_cmd *isert_cmd,
+ struct iser_tx_desc *tx_desc)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+ ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
+ tx_desc->iser_header.flags = ISER_VER;
+
+ tx_desc->num_sge = 1;
+ tx_desc->isert_cmd = isert_cmd;
+
+ if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
+ tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
+ pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
+ }
+}
+
+static int
+isert_init_tx_hdrs(struct isert_conn *isert_conn,
+ struct iser_tx_desc *tx_desc)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->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)) {
+ pr_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 = isert_conn->conn_mr->lkey;
+
+ pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
+ " lkey: 0x%08x\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_cmd *isert_cmd, struct ib_send_wr *send_wr)
+{
+ isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
+ send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
+ send_wr->opcode = IB_WR_SEND;
+ send_wr->send_flags = IB_SEND_SIGNALED;
+ send_wr->sg_list = &isert_cmd->tx_desc.tx_sg[0];
+ send_wr->num_sge = isert_cmd->tx_desc.num_sge;
+}
+
+static int
+isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_rx_desc *rx_desc;
+ struct iser_rx_desc *desc;
+ struct ib_sge *rx_sg;
+ u64 dma_addr;
+ int i, j;
+
+ isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
+ sizeof(struct isert_rx_desc), GFP_KERNEL);
+ if (!isert_conn->conn_rx_descs)
+ goto fail;
+
+ rx_desc = isert_conn->conn_rx_descs;
+
+ for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
+ desc = &rx_desc->desc;
+
+ dma_addr = ib_dma_map_single(ib_dev, (void *)desc,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(ib_dev, dma_addr))
+ goto dma_map_fail;
+
+ desc->dma_addr = dma_addr;
+
+ rx_sg = &desc->rx_sg;
+ rx_sg->addr = desc->dma_addr;
+ rx_sg->length = ISER_RX_PAYLOAD_SIZE;
+ rx_sg->lkey = isert_conn->conn_mr->lkey;
+ }
+
+ isert_conn->conn_rx_desc_head = 0;
+ return 0;
+
+dma_map_fail:
+ rx_desc = isert_conn->conn_rx_descs;
+ for (j = 0; j < i; j++, rx_desc++) {
+ desc = &rx_desc->desc;
+ ib_dma_unmap_single(ib_dev, desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ }
+ kfree(isert_conn->conn_rx_descs);
+ isert_conn->conn_rx_descs = NULL;
+fail:
+ return -ENOMEM;
+}
+
+void
+isert_free_rx_descriptors(struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_rx_desc *rx_desc;
+ struct iser_rx_desc *desc;
+ int i;
+
+ if (!isert_conn->conn_rx_descs)
+ return;
+
+ rx_desc = isert_conn->conn_rx_descs;
+ for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
+ desc = &rx_desc->desc;
+ ib_dma_unmap_single(ib_dev, desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ }
+
+ kfree(isert_conn->conn_rx_descs);
+ isert_conn->conn_rx_descs = NULL;
+}
+
+static int isert_rdma_post_recvl(struct isert_conn *);
+
+static int
+isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
+ u32 length)
+{
+ struct isert_conn *isert_conn = conn->context;
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
+ int ret;
+
+ isert_create_send_desc(isert_conn, NULL, 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->conn_mr->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_recv(isert_conn, ISERT_MIN_POSTED_RX);
+ if (ret)
+ return ret;
+
+ isert_conn->state = ISER_CONN_UP;
+ goto post_send;
+ }
+
+ ret = isert_rdma_post_recvl(isert_conn);
+ if (ret)
+ return ret;
+ }
+post_send:
+ ret = isert_post_send(isert_conn, tx_desc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void
+isert_rx_login_req(struct isert_rx_desc *rx_desc, int rx_buflen,
+ struct isert_conn *isert_conn)
+{
+ struct iser_rx_desc *desc = &rx_desc->desc;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_login *login = conn->conn_login;
+ int size;
+
+ if (!login) {
+ pr_err("conn->conn_login is NULL\n");
+ dump_stack();
+ return;
+ }
+
+ if (login->first_request) {
+ struct iscsi_login_req *login_req =
+ (struct iscsi_login_req *)&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 *)&desc->iscsi_header, ISCSI_HDR_LEN);
+
+ size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
+ pr_debug("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, &desc->data[0], size);
+
+ complete(&isert_conn->conn_login_comp);
+}
+
+static void
+isert_release_cmd(struct iscsi_cmd *cmd)
+{
+ struct isert_cmd *isert_cmd = container_of(cmd, struct isert_cmd,
+ iscsi_cmd);
+
+ pr_debug("Entering isert_release_cmd %p >>>>>>>>>>>>>>>.\n", isert_cmd);
+
+ kfree(cmd->buf_ptr);
+ kfree(cmd->tmr_req);
+
+ kmem_cache_free(isert_cmd_cache, isert_cmd);
+}
+
+static struct iscsi_cmd
+*isert_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp)
+{
+ struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ struct isert_cmd *isert_cmd;
+
+ isert_cmd = kmem_cache_zalloc(isert_cmd_cache, gfp);
+ if (!isert_cmd) {
+ pr_err("Unable to allocate isert_cmd\n");
+ return NULL;
+ }
+ isert_cmd->conn = isert_conn;
+ isert_cmd->iscsi_cmd.release_cmd = &isert_release_cmd;
+
+ return &isert_cmd->iscsi_cmd;
+}
+
+static int
+isert_handle_scsi_cmd(struct isert_conn *isert_conn,
+ struct isert_cmd *isert_cmd, struct iser_rx_desc *rx_desc,
+ unsigned char *buf)
+{
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+ struct iscsi_conn *conn = isert_conn->conn;
+ struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
+ struct scatterlist *sg;
+ int imm_data, imm_data_len, unsol_data, sg_nents, rc;
+ bool dump_payload = false;
+
+ 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;
+
+ 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;
+
+ sg = &cmd->se_cmd.t_data_sg[0];
+ sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
+
+ pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
+ sg, sg_nents, &rx_desc->data[0], imm_data_len);
+
+ sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], 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, hdr->cmdsn);
+
+ if (!rc && dump_payload == false && unsol_data)
+ iscsit_set_unsoliticed_dataout(cmd);
+
+ if (rc == CMDSN_ERROR_CANNOT_RECOVER)
+ return iscsit_add_reject_from_cmd(
+ ISCSI_REASON_PROTOCOL_ERROR,
+ 1, 0, (unsigned char *)hdr, 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) {
+ pr_err("Received unexpected solicited data payload\n");
+ dump_stack();
+ return -1;
+ }
+
+ pr_debug("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) {
+ pr_err("Received unexpected non-page aligned data payload\n");
+ dump_stack();
+ return -1;
+ }
+ pr_debug("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;
+
+ return 0;
+}
+
+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);
+
+ switch (opcode) {
+ case ISCSI_OP_SCSI_CMD:
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ break;
+
+ isert_cmd = container_of(cmd, struct isert_cmd, iscsi_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;
+
+ ret = isert_handle_scsi_cmd(isert_conn, isert_cmd,
+ rx_desc, (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_NOOP_OUT:
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ break;
+
+ ret = iscsit_handle_nop_out(conn, cmd, (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 = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ break;
+
+ ret = iscsit_handle_task_mgt_cmd(conn, cmd,
+ (unsigned char *)hdr);
+ break;
+ case ISCSI_OP_LOGOUT:
+ cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+ if (!cmd)
+ break;
+
+ ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
+ if (ret > 0)
+ wait_for_completion_timeout(&conn->conn_logout_comp,
+ SECONDS_FOR_LOGOUT_COMP *
+ HZ);
+ break;
+ default:
+ pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
+ dump_stack();
+ break;
+ }
+
+ return ret;
+}
+
+static void
+isert_rx_do_work(struct isert_rx_desc *rx_desc, struct isert_conn *isert_conn)
+{
+ struct iser_rx_desc *desc = &rx_desc->desc;
+ struct iser_hdr *iser_hdr = &desc->iser_header;
+ uint64_t read_va = 0, write_va = 0;
+ uint32_t read_stag = 0, write_stag = 0;
+ int rc;
+
+ switch (iser_hdr->flags & 0xF0) {
+ case ISCSI_CTRL:
+ if (iser_hdr->flags & ISER_RSV) {
+ read_stag = be32_to_cpu(iser_hdr->read_stag);
+ read_va = be64_to_cpu(iser_hdr->read_va);
+ pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
+ read_stag, (unsigned long long)read_va);
+ }
+ if (iser_hdr->flags & ISER_WSV) {
+ write_stag = be32_to_cpu(iser_hdr->write_stag);
+ write_va = be64_to_cpu(iser_hdr->write_va);
+ pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
+ write_stag, (unsigned long long)write_va);
+ }
+
+ pr_debug("ISER ISCSI_CTRL PDU\n");
+ break;
+ case ISER_HELLO:
+ pr_err("iSER Hello message\n");
+ break;
+ default:
+ pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
+ break;
+ }
+
+ rc = isert_rx_opcode(isert_conn, desc,
+ read_stag, read_va, write_stag, write_va);
+}
+
+static void
+isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
+ unsigned long xfer_len)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_rx_desc *rx_desc = container_of(desc,
+ struct isert_rx_desc, desc);
+ struct iscsi_hdr *hdr;
+ u64 rx_dma;
+ int rx_buflen, outstanding;
+
+ rx_desc->desc_conn = isert_conn;
+
+ if ((char *)desc == isert_conn->login_req_buf) {
+ rx_dma = isert_conn->login_req_dma;
+ rx_buflen = ISER_RX_LOGIN_SIZE;
+ pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
+ rx_dma, rx_buflen);
+ } else {
+ rx_dma = desc->dma_addr;
+ rx_buflen = ISER_RX_PAYLOAD_SIZE;
+ pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
+ rx_dma, rx_buflen);
+ }
+
+ ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
+
+ hdr = &desc->iscsi_header;
+ pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %lu\n",
+ hdr->opcode, hdr->itt, hdr->flags,
+ (int)xfer_len - ISER_HEADERS_LEN);
+
+ if ((char *)desc == isert_conn->login_req_buf)
+ isert_rx_login_req(rx_desc, xfer_len - ISER_HEADERS_LEN,
+ isert_conn);
+ else
+ isert_rx_do_work(rx_desc, isert_conn);
+
+ ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
+ DMA_FROM_DEVICE);
+
+ isert_conn->post_recv_buf_count--;
+ pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
+ isert_conn->post_recv_buf_count);
+
+ if ((char *)desc == isert_conn->login_req_buf)
+ return;
+
+ outstanding = isert_conn->post_recv_buf_count;
+ if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
+ int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
+ ISERT_MIN_POSTED_RX);
+ err = isert_post_recv(isert_conn, count);
+ if (err) {
+ pr_err("isert_post_recv() count: %d failed, %d\n",
+ count, err);
+ }
+ }
+}
+
+static void
+isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
+{
+ struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+ pr_debug("isert_unmap_cmd >>>>>>>>>>>>>>>>>>>>>>>\n");
+
+ if (wr->sge) {
+ ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
+ wr->sge = NULL;
+ }
+
+ kfree(wr->send_wr);
+ wr->send_wr = NULL;
+
+ kfree(isert_cmd->ib_sge);
+ isert_cmd->ib_sge = NULL;
+}
+
+static void
+isert_put_cmd(struct isert_cmd *isert_cmd)
+{
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+ struct isert_conn *isert_conn = isert_cmd->conn;
+ struct iscsi_conn *conn;
+
+ pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
+
+ switch (cmd->iscsi_opcode) {
+ case ISCSI_OP_SCSI_CMD:
+ conn = isert_conn->conn;
+
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (cmd->data_direction == DMA_TO_DEVICE)
+ iscsit_stop_dataout_timer(cmd);
+
+ isert_unmap_cmd(isert_cmd, isert_conn);
+ /*
+ * Fall-through
+ */
+ case ISCSI_OP_SCSI_TMFUNC:
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+ break;
+ case ISCSI_OP_REJECT:
+ case ISCSI_OP_NOOP_OUT:
+ conn = isert_conn->conn;
+
+ spin_lock_bh(&conn->cmd_lock);
+ if (!list_empty(&cmd->i_conn_node))
+ list_del(&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) {
+ transport_generic_free_cmd(&cmd->se_cmd, 0);
+ break;
+ }
+ /*
+ * Fall-through
+ */
+ default:
+ isert_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) {
+ pr_debug("Calling ib_dma_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)
+{
+ if (isert_cmd->sense_buf_dma != 0) {
+ pr_debug("Calling ib_dma_unmap_single for isert_cmd->sense_buf_dma\n");
+ ib_dma_unmap_single(ib_dev, isert_cmd->sense_buf_dma,
+ isert_cmd->sense_buf_len, DMA_TO_DEVICE);
+ isert_cmd->sense_buf_dma = 0;
+ }
+
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+ isert_put_cmd(isert_cmd);
+}
+
+static void
+isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
+ struct isert_cmd *isert_cmd)
+{
+ struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct ib_device *ib_dev = isert_cmd->conn->conn_cm_id->device;
+
+ iscsit_stop_dataout_timer(cmd);
+
+ if (wr->sge) {
+ pr_debug("isert_do_rdma_read_comp: Unmapping wr->sge from t_data_sg\n");
+ ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
+ wr->sge = NULL;
+ }
+
+ if (isert_cmd->ib_sge) {
+ pr_debug("isert_do_rdma_read_comp: Freeing isert_cmd->ib_sge\n");
+ kfree(isert_cmd->ib_sge);
+ isert_cmd->ib_sge = NULL;
+ }
+
+ cmd->write_data_done = se_cmd->data_length;
+
+ pr_debug("isert_do_rdma_read_comp, calling target_execute_cmd\n");
+ 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);
+
+ 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->conn_cm_id->device;
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+
+ switch (cmd->i_state) {
+ case ISTATE_SEND_TASKMGTRSP:
+ pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
+
+ atomic_dec(&isert_conn->post_send_buf_count);
+ iscsit_tmr_post_handler(cmd, cmd->conn);
+
+ cmd->i_state = ISTATE_SENT_STATUS;
+ isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
+ break;
+ case ISTATE_SEND_REJECT:
+ pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
+ atomic_dec(&isert_conn->post_send_buf_count);
+
+ cmd->i_state = ISTATE_SENT_STATUS;
+ complete(&cmd->reject_comp);
+ isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
+ case ISTATE_SEND_LOGOUTRSP:
+ pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
+ /*
+ * Call atomic_dec(&isert_conn->post_send_buf_count)
+ * from isert_free_conn()
+ */
+ iscsit_logout_post_handler(cmd, cmd->conn);
+ break;
+ default:
+ pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
+ dump_stack();
+ break;
+ }
+}
+
+static void
+isert_response_completion(struct iser_tx_desc *tx_desc,
+ struct isert_cmd *isert_cmd,
+ struct isert_conn *isert_conn,
+ struct ib_device *ib_dev)
+{
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+
+ if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
+ cmd->i_state == ISTATE_SEND_LOGOUTRSP) {
+ 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;
+ }
+ atomic_dec(&isert_conn->post_send_buf_count);
+
+ cmd->i_state = ISTATE_SENT_STATUS;
+ isert_completion_put(tx_desc, isert_cmd, ib_dev);
+}
+
+static void
+isert_send_completion(struct iser_tx_desc *tx_desc,
+ struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+ struct isert_rdma_wr *wr;
+
+ if (!isert_cmd) {
+ atomic_dec(&isert_conn->post_send_buf_count);
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+ return;
+ }
+ wr = &isert_cmd->rdma_wr;
+
+ switch (wr->iser_ib_op) {
+ case ISER_IB_RECV:
+ pr_err("isert_send_completion: Got ISER_IB_RECV\n");
+ dump_stack();
+ break;
+ case ISER_IB_SEND:
+ pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
+ isert_response_completion(tx_desc, isert_cmd,
+ isert_conn, ib_dev);
+ break;
+ case ISER_IB_RDMA_WRITE:
+ pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
+ dump_stack();
+ break;
+ case ISER_IB_RDMA_READ:
+ pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
+
+ atomic_dec(&isert_conn->post_send_buf_count);
+ isert_completion_rdma_read(tx_desc, isert_cmd);
+ break;
+ default:
+ pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
+ dump_stack();
+ break;
+ }
+}
+
+static void
+isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+ if (tx_desc) {
+ struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+
+ if (!isert_cmd)
+ isert_unmap_tx_desc(tx_desc, ib_dev);
+ else
+ isert_completion_put(tx_desc, isert_cmd, ib_dev);
+ }
+
+ if (isert_conn->post_recv_buf_count == 0 &&
+ atomic_read(&isert_conn->post_send_buf_count) == 0) {
+ pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+ pr_debug("Calling wake_up from isert_cq_comp_err\n");
+
+ isert_conn->state = ISER_CONN_DOWN;
+ wake_up(&isert_conn->conn_wait);
+ }
+}
+
+void
+isert_cq_tx_work(struct work_struct *work)
+{
+ struct isert_cq_desc *cq_desc = container_of(work,
+ struct isert_cq_desc, cq_tx_work);
+ struct isert_device *device = cq_desc->device;
+ int cq_index = cq_desc->cq_index;
+ struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
+ struct isert_conn *isert_conn;
+ struct iser_tx_desc *tx_desc;
+ struct ib_wc wc;
+
+ while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
+ tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
+ isert_conn = wc.qp->qp_context;
+
+ if (wc.status == IB_WC_SUCCESS) {
+ isert_send_completion(tx_desc, isert_conn);
+ } else {
+ pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
+ pr_debug("TX wc.status: 0x%08x\n", wc.status);
+ atomic_dec(&isert_conn->post_send_buf_count);
+ isert_cq_comp_err(tx_desc, isert_conn);
+ }
+ }
+
+ ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
+}
+
+void
+isert_cq_tx_callback(struct ib_cq *cq, void *context)
+{
+ struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
+
+ INIT_WORK(&cq_desc->cq_tx_work, isert_cq_tx_work);
+ queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
+}
+
+void
+isert_cq_rx_work(struct work_struct *work)
+{
+ struct isert_cq_desc *cq_desc = container_of(work,
+ struct isert_cq_desc, cq_rx_work);
+ struct isert_device *device = cq_desc->device;
+ int cq_index = cq_desc->cq_index;
+ struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
+ struct isert_conn *isert_conn;
+ struct iser_rx_desc *rx_desc;
+ struct ib_wc wc;
+ unsigned long xfer_len;
+
+ while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
+ rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
+ isert_conn = wc.qp->qp_context;
+
+ if (wc.status == IB_WC_SUCCESS) {
+ xfer_len = (unsigned long)wc.byte_len;
+ isert_rx_completion(rx_desc, isert_conn, xfer_len);
+ } else {
+ pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
+ if (wc.status != IB_WC_WR_FLUSH_ERR)
+ pr_debug("RX wc.status: 0x%08x\n", wc.status);
+
+ isert_conn->post_recv_buf_count--;
+ isert_cq_comp_err(NULL, isert_conn);
+ }
+ }
+
+ ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
+}
+
+void
+isert_cq_rx_callback(struct ib_cq *cq, void *context)
+{
+ struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
+
+ INIT_WORK(&cq_desc->cq_rx_work, isert_cq_rx_work);
+ queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
+}
+
+static int
+isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
+{
+ struct ib_send_wr *wr_failed;
+ int ret;
+
+ atomic_inc(&isert_conn->post_send_buf_count);
+
+ ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
+ &wr_failed);
+ if (ret) {
+ pr_err("ib_post_send failed with %d\n", ret);
+ atomic_dec(&isert_conn->post_send_buf_count);
+ return ret;
+ }
+ return ret;
+}
+
+static int
+isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+ struct isert_cmd *isert_cmd = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_conn *isert_conn = (struct 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 ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
+ u32 padding, sense_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);
+ sense_len = cmd->se_cmd.scsi_sense_length + padding;
+
+ isert_cmd->sense_buf_dma = ib_dma_map_single(ib_dev,
+ (void *)cmd->sense_buffer, sense_len,
+ DMA_TO_DEVICE);
+
+ isert_cmd->sense_buf_len = sense_len;
+ ib_dma_sync_single_for_cpu(ib_dev, isert_cmd->sense_buf_dma,
+ sense_len, DMA_TO_DEVICE);
+ ib_dma_sync_single_for_device(ib_dev, isert_cmd->sense_buf_dma,
+ sense_len, DMA_TO_DEVICE);
+
+ tx_dsg->addr = isert_cmd->sense_buf_dma;
+ tx_dsg->length = sense_len;
+ tx_dsg->lkey = isert_conn->conn_mr->lkey;
+ isert_cmd->tx_desc.num_sge = 2;
+ }
+
+ isert_init_send_wr(isert_cmd, send_wr);
+
+ pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+ bool nopout_response)
+{
+ struct isert_cmd *isert_cmd = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_conn *isert_conn = (struct 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_cmd, send_wr);
+
+ pr_debug("Posting NOPIN Reponse IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+ 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 = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_conn *isert_conn = (struct 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_cmd, send_wr);
+
+ pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+ 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 = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_conn *isert_conn = (struct 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_cmd, send_wr);
+
+ pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+ 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 = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_conn *isert_conn = (struct 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_reject(cmd, conn, (struct iscsi_reject *)
+ &isert_cmd->tx_desc.iscsi_header);
+ isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+ isert_init_send_wr(isert_cmd, send_wr);
+
+ pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+ return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+ struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
+ u32 data_left, u32 offset)
+{
+ struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+ struct scatterlist *sg_start, *tmp_sg;
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ u32 sg_off, page_off;
+ int i = 0, sg_nents;
+
+ sg_off = offset / PAGE_SIZE;
+ sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+ sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
+ page_off = offset % PAGE_SIZE;
+
+ send_wr->sg_list = ib_sge;
+ send_wr->num_sge = sg_nents;
+ send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
+ /*
+ * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
+ */
+ for_each_sg(sg_start, tmp_sg, sg_nents, i) {
+ pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
+ (unsigned long long)tmp_sg->dma_address,
+ tmp_sg->length, page_off);
+
+ ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
+ ib_sge->length = min_t(u32, data_left,
+ ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
+ ib_sge->lkey = isert_conn->conn_mr->lkey;
+
+ pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u\n",
+ ib_sge->addr, ib_sge->length);
+ page_off = 0;
+ data_left -= ib_sge->length;
+ ib_sge++;
+ pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
+ }
+
+ pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
+ send_wr->sg_list, send_wr->num_sge);
+
+ return sg_nents;
+}
+
+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 = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+ struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ struct ib_send_wr *wr_failed, *send_wr;
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct ib_sge *ib_sge;
+ struct scatterlist *sg;
+ u32 offset = 0, data_len, data_left, rdma_write_max;
+ int rc, ret = 0, count, sg_nents, i, ib_sge_cnt;
+
+ pr_debug("RDMA_WRITE: data_length: %u\n", se_cmd->data_length);
+
+ sg = &se_cmd->t_data_sg[0];
+ sg_nents = se_cmd->t_data_nents;
+
+ count = ib_dma_map_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
+ if (unlikely(!count)) {
+ pr_err("Unable to map put_datain SGs\n");
+ return -EINVAL;
+ }
+ wr->sge = sg;
+ wr->num_sge = sg_nents;
+ pr_debug("Mapped IB count: %u sg: %p sg_nents: %u for RDMA_WRITE\n",
+ count, sg, sg_nents);
+
+ ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
+ if (!ib_sge) {
+ pr_warn("Unable to allocate datain ib_sge\n");
+ ret = -ENOMEM;
+ goto unmap_sg;
+ }
+ isert_cmd->ib_sge = ib_sge;
+
+ pr_debug("Allocated ib_sge: %p from t_data_ents: %d for RDMA_WRITE\n",
+ ib_sge, se_cmd->t_data_nents);
+
+ wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
+ wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
+ GFP_KERNEL);
+ if (!wr->send_wr) {
+ pr_err("Unable to allocate wr->send_wr\n");
+ ret = -ENOMEM;
+ goto unmap_sg;
+ }
+ pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
+ wr->send_wr, wr->send_wr_num);
+
+ iscsit_increment_maxcmdsn(cmd, conn->sess);
+ cmd->stat_sn = conn->stat_sn++;
+
+ wr->isert_cmd = isert_cmd;
+ rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
+ data_left = se_cmd->data_length;
+
+ for (i = 0; i < wr->send_wr_num; i++) {
+ send_wr = &isert_cmd->rdma_wr.send_wr[i];
+ data_len = min(data_left, rdma_write_max);
+
+ send_wr->opcode = IB_WR_RDMA_WRITE;
+ send_wr->send_flags = 0;
+ send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
+ send_wr->wr.rdma.rkey = isert_cmd->read_stag;
+
+ ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
+ send_wr, data_len, offset);
+ ib_sge += ib_sge_cnt;
+
+ if (i + 1 == wr->send_wr_num)
+ send_wr->next = &isert_cmd->tx_desc.send_wr;
+ else
+ send_wr->next = &wr->send_wr[i + 1];
+
+ offset += data_len;
+ data_left -= data_len;
+ }
+ /*
+ * 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, false, (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_cmd, &isert_cmd->tx_desc.send_wr);
+
+ atomic_inc(&isert_conn->post_send_buf_count);
+
+ rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
+ if (rc) {
+ pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
+ atomic_dec(&isert_conn->post_send_buf_count);
+ }
+ pr_debug("Posted RDMA_WRITE + Response for iSER Data READ\n");
+ return 1;
+
+unmap_sg:
+ ib_dma_unmap_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
+ return ret;
+}
+
+static int
+isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
+{
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct isert_cmd *isert_cmd = container_of(cmd,
+ struct isert_cmd, iscsi_cmd);
+ struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+ struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ struct ib_send_wr *wr_failed, *send_wr;
+ struct ib_sge *ib_sge;
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct scatterlist *sg_start;
+ u32 sg_off, sg_nents, page_off, va_offset = 0;
+ u32 offset = 0, data_len, data_left, rdma_write_max;
+ int rc, ret = 0, count, i, ib_sge_cnt;
+
+ pr_debug("RDMA_READ: data_length: %u write_data_done: %u\n",
+ se_cmd->data_length, cmd->write_data_done);
+
+ sg_off = cmd->write_data_done / PAGE_SIZE;
+ sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+ page_off = cmd->write_data_done % PAGE_SIZE;
+
+ pr_debug("RDMA_READ: sg_off: %d, sg_start: %p page_off: %d\n",
+ sg_off, sg_start, page_off);
+
+ data_left = se_cmd->data_length - cmd->write_data_done;
+ sg_nents = se_cmd->t_data_nents - sg_off;
+
+ pr_debug("RDMA_READ: data_left: %d, sg_nents: %d\n",
+ data_left, sg_nents);
+
+ count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
+ if (unlikely(!count)) {
+ pr_err("Unable to map get_dataout SGs\n");
+ return -EINVAL;
+ }
+ wr->sge = sg_start;
+ wr->num_sge = sg_nents;
+ pr_debug("Mapped IB count: %u sg_start: %p sg_nents: %u for RDMA_READ\n",
+ count, sg_start, sg_nents);
+
+ ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
+ if (!ib_sge) {
+ pr_warn("Unable to allocate dataout ib_sge\n");
+ ret = -ENOMEM;
+ goto unmap_sg;
+ }
+ isert_cmd->ib_sge = ib_sge;
+
+ pr_debug("Using ib_sge: %p from sg_ents: %d for RDMA_READ\n",
+ ib_sge, sg_nents);
+
+ wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
+ wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
+ GFP_KERNEL);
+ if (!wr->send_wr) {
+ pr_debug("Unable to allocate wr->send_wr\n");
+ ret = -ENOMEM;
+ goto unmap_sg;
+ }
+ pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
+ wr->send_wr, wr->send_wr_num);
+
+ isert_cmd->tx_desc.isert_cmd = isert_cmd;
+
+ wr->iser_ib_op = ISER_IB_RDMA_READ;
+ wr->isert_cmd = isert_cmd;
+ rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
+ offset = cmd->write_data_done;
+
+ for (i = 0; i < wr->send_wr_num; i++) {
+ send_wr = &isert_cmd->rdma_wr.send_wr[i];
+ data_len = min(data_left, rdma_write_max);
+
+ send_wr->opcode = IB_WR_RDMA_READ;
+ send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
+ send_wr->wr.rdma.rkey = isert_cmd->write_stag;
+
+ ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
+ send_wr, data_len, offset);
+ ib_sge += ib_sge_cnt;
+
+ if (i + 1 == wr->send_wr_num)
+ send_wr->send_flags = IB_SEND_SIGNALED;
+ else
+ send_wr->next = &wr->send_wr[i + 1];
+
+ offset += data_len;
+ va_offset += data_len;
+ data_left -= data_len;
+ }
+
+ atomic_inc(&isert_conn->post_send_buf_count);
+
+ rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
+ if (rc) {
+ pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
+ atomic_dec(&isert_conn->post_send_buf_count);
+ }
+ pr_debug("Posted RDMA_READ memory for ISER Data WRITE\n");
+ return 0;
+
+unmap_sg:
+ ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
+ return ret;
+}
+
+static int
+isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+ int ret;
+
+ switch (state) {
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ ret = isert_put_nopin(cmd, conn, false);
+ break;
+ default:
+ pr_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)
+{
+ int ret;
+
+ switch (state) {
+ case ISTATE_SEND_LOGOUTRSP:
+ ret = isert_put_logout_rsp(cmd, conn);
+ if (!ret) {
+ pr_debug("Returning iSER Logout -EAGAIN\n");
+ ret = -EAGAIN;
+ }
+ 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;
+ default:
+ pr_err("Unknown response state: 0x%02x\n", state);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int
+isert_setup_np(struct iscsi_np *np,
+ struct __kernel_sockaddr_storage *ksockaddr)
+{
+ struct isert_np *isert_np;
+ struct rdma_cm_id *isert_lid;
+ struct sockaddr *sa;
+ int ret;
+
+ isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
+ if (!isert_np) {
+ pr_err("Unable to allocate struct isert_np\n");
+ return -ENOMEM;
+ }
+ init_waitqueue_head(&isert_np->np_accept_wq);
+ mutex_init(&isert_np->np_accept_mutex);
+ INIT_LIST_HEAD(&isert_np->np_accept_list);
+ init_completion(&isert_np->np_login_comp);
+
+ sa = (struct sockaddr *)ksockaddr;
+ pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
+
+ isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
+ IB_QPT_RC);
+ if (IS_ERR(isert_lid)) {
+ pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
+ PTR_ERR(isert_lid));
+ return PTR_ERR(isert_lid);
+ }
+
+ ret = rdma_bind_addr(isert_lid, sa);
+ if (ret) {
+ pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
+ if (ret) {
+ pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
+ return ret;
+ }
+
+ isert_np->np_cm_id = isert_lid;
+ np->np_context = isert_np;
+ pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
+
+ return 0;
+}
+
+static int
+isert_check_accept_queue(struct isert_np *isert_np)
+{
+ int empty;
+
+ mutex_lock(&isert_np->np_accept_mutex);
+ empty = list_empty(&isert_np->np_accept_list);
+ mutex_unlock(&isert_np->np_accept_mutex);
+
+ return empty;
+}
+
+static int
+isert_rdma_post_recvl(struct isert_conn *isert_conn)
+{
+ struct ib_recv_wr rx_wr, *rx_wr_fail;
+ struct ib_sge sge;
+ int ret;
+
+ memset(&sge, 0, sizeof(struct ib_sge));
+ sge.addr = isert_conn->login_req_dma;
+ sge.length = ISER_RX_LOGIN_SIZE;
+ sge.lkey = isert_conn->conn_mr->lkey;
+
+ pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
+ sge.addr, sge.length, sge.lkey);
+
+ memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
+ rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
+ rx_wr.sg_list = &sge;
+ rx_wr.num_sge = 1;
+
+ isert_conn->post_recv_buf_count++;
+ ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
+ if (ret) {
+ pr_err("ib_post_recv() failed: %d\n", ret);
+ isert_conn->post_recv_buf_count--;
+ }
+
+ pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+ return ret;
+}
+
+static int
+isert_rdma_accept(struct isert_conn *isert_conn)
+{
+ struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
+ struct rdma_conn_param cp;
+ int ret;
+
+ memset(&cp, 0, sizeof(struct rdma_conn_param));
+ cp.responder_resources = isert_conn->responder_resources;
+ cp.initiator_depth = isert_conn->initiator_depth;
+ cp.retry_count = 7;
+ cp.rnr_retry_count = 7;
+
+ pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
+
+ ret = rdma_accept(cm_id, &cp);
+ if (ret) {
+ pr_err("rdma_accept() failed with: %d\n", ret);
+ return ret;
+ }
+
+ pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
+
+ return 0;
+}
+
+static int
+isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
+{
+ struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+ int ret;
+
+ pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
+
+ ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
+ if (ret)
+ return ret;
+
+ pr_debug("isert_get_login_rx 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->conn_cm_id;
+ struct rdma_route *cm_route = &cm_id->route;
+ struct sockaddr_in *sock_in;
+ struct sockaddr_in6 *sock_in6;
+
+ conn->login_family = np->np_sockaddr.ss_family;
+
+ if (np->np_sockaddr.ss_family == AF_INET6) {
+ sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
+ snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
+ &sock_in6->sin6_addr.in6_u);
+ conn->login_port = ntohs(sock_in6->sin6_port);
+
+ sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
+ snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
+ &sock_in6->sin6_addr.in6_u);
+ conn->local_port = ntohs(sock_in6->sin6_port);
+ } else {
+ sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
+ sprintf(conn->login_ip, "%pI4",
+ &sock_in->sin_addr.s_addr);
+ conn->login_port = ntohs(sock_in->sin_port);
+
+ sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
+ sprintf(conn->local_ip, "%pI4",
+ &sock_in->sin_addr.s_addr);
+ conn->local_port = ntohs(sock_in->sin_port);
+ }
+}
+
+static int
+isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
+{
+ struct isert_np *isert_np = (struct isert_np *)np->np_context;
+ struct isert_conn *isert_conn;
+ int max_accept = 0, ret;
+
+accept_wait:
+ ret = wait_event_interruptible(isert_np->np_accept_wq,
+ !isert_check_accept_queue(isert_np) ||
+ np->np_thread_state == ISCSI_NP_THREAD_RESET);
+ if (max_accept > 5)
+ 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);
+ pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
+ return -ENODEV;
+ }
+ spin_unlock_bh(&np->np_thread_lock);
+
+ mutex_lock(&isert_np->np_accept_mutex);
+ if (list_empty(&isert_np->np_accept_list)) {
+ mutex_unlock(&isert_np->np_accept_mutex);
+ max_accept++;
+ goto accept_wait;
+ }
+ isert_conn = list_first_entry(&isert_np->np_accept_list,
+ struct isert_conn, conn_accept_node);
+ list_del_init(&isert_conn->conn_accept_node);
+ mutex_unlock(&isert_np->np_accept_mutex);
+
+ conn->context = isert_conn;
+ isert_conn->conn = conn;
+ max_accept = 0;
+
+ ret = isert_rdma_post_recvl(isert_conn);
+ if (ret)
+ return ret;
+
+ ret = isert_rdma_accept(isert_conn);
+ if (ret)
+ return ret;
+
+ isert_set_conn_info(np, conn, isert_conn);
+
+ pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
+ return 0;
+}
+
+static void
+isert_free_np(struct iscsi_np *np)
+{
+ struct isert_np *isert_np = (struct isert_np *)np->np_context;
+
+ rdma_destroy_id(isert_np->np_cm_id);
+
+ np->np_context = NULL;
+ kfree(isert_np);
+}
+
+static void isert_free_conn(struct iscsi_conn *conn)
+{
+ struct isert_conn *isert_conn = conn->context;
+
+ pr_debug("isert_free_conn: Before isert_put_conn\n");
+
+ atomic_dec(&isert_conn->post_send_buf_count);
+
+ if (isert_conn->conn_cm_id)
+ rdma_disconnect(isert_conn->conn_cm_id);
+
+ pr_debug("isert_free_conn: Before wait_event :%d\n", isert_conn->state);
+ wait_event(isert_conn->conn_wait, isert_conn->state == ISER_CONN_DOWN);
+ pr_debug("isert_free_conn: After wait_event >>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+ isert_put_conn(isert_conn);
+}
+
+static struct iscsit_transport iser_target_transport = {
+ .name = "IB/iSER",
+ .transport_type = ISCSI_INFINIBAND,
+ .owner = THIS_MODULE,
+ .iscsit_setup_np = isert_setup_np,
+ .iscsit_accept_np = isert_accept_np,
+ .iscsit_free_np = isert_free_np,
+ .iscsit_free_conn = isert_free_conn,
+ .iscsit_alloc_cmd = isert_alloc_cmd,
+ .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,
+};
+
+static int __init isert_init(void)
+{
+ int ret;
+
+ isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
+ if (!isert_rx_wq) {
+ pr_err("Unable to allocate isert_rx_wq\n");
+ return -ENOMEM;
+ }
+
+ isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
+ if (!isert_comp_wq) {
+ pr_err("Unable to allocate isert_comp_wq\n");
+ ret = -ENOMEM;
+ goto destroy_rx_wq;
+ }
+
+ isert_cmd_cache = kmem_cache_create("isert_cmd_cache",
+ sizeof(struct isert_cmd), __alignof__(struct isert_cmd),
+ 0, NULL);
+ if (!isert_cmd_cache) {
+ pr_err("Unable to create isert_cmd_cache\n");
+ ret = -ENOMEM;
+ goto destroy_tx_cq;
+ }
+
+ iscsit_register_transport(&iser_target_transport);
+ pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
+
+ pr_debug("ISER_HEADERS_LEN: %lu\n", ISER_HEADERS_LEN);
+ pr_debug("ISER_RECV_DATA_SEG_LEN: %d\n", ISER_RECV_DATA_SEG_LEN);
+ pr_debug("ISER_RX_PAYLOAD_SIZE: %lu\n", ISER_RX_PAYLOAD_SIZE);
+ pr_debug("ISER_RX_PAD_SIZE: %lu\n", ISER_RX_PAD_SIZE);
+
+ return 0;
+
+destroy_tx_cq:
+ destroy_workqueue(isert_comp_wq);
+destroy_rx_wq:
+ destroy_workqueue(isert_rx_wq);
+ return ret;
+}
+
+static void __exit isert_exit(void)
+{
+ kmem_cache_destroy(isert_cmd_cache);
+ destroy_workqueue(isert_comp_wq);
+ destroy_workqueue(isert_rx_wq);
+ iscsit_unregister_transport(&iser_target_transport);
+ pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
+}
+
+MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
+MODULE_VERSION("0.1");
+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 0000000..0537cd7
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -0,0 +1,142 @@
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+#define ISERT_RDMA_LISTEN_BACKLOG 10
+
+enum isert_desc_type {
+ ISCSI_TX_CONTROL,
+ ISCSI_TX_DATAIN
+};
+
+enum iser_ib_op_code {
+ ISER_IB_RECV,
+ ISER_IB_SEND,
+ ISER_IB_RDMA_WRITE,
+ ISER_IB_RDMA_READ,
+};
+
+enum iser_conn_state {
+ ISER_CONN_INIT,
+ ISER_CONN_UP,
+ ISER_CONN_TERMINATING,
+ ISER_CONN_DOWN,
+};
+
+struct iser_rx_desc {
+ struct iser_hdr iser_header;
+ struct iscsi_hdr iscsi_header;
+ char data[ISER_RECV_DATA_SEG_LEN];
+ u64 dma_addr;
+ struct ib_sge rx_sg;
+ char pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+struct isert_rx_desc {
+ struct isert_conn *desc_conn;
+ struct work_struct desc_work;
+ struct iser_rx_desc desc;
+} __packed;
+
+struct iser_tx_desc {
+ struct iser_hdr iser_header;
+ struct iscsi_hdr iscsi_header;
+ enum isert_desc_type type;
+ u64 dma_addr;
+ struct ib_sge tx_sg[2];
+ int num_sge;
+ struct isert_cmd *isert_cmd;
+ struct ib_send_wr send_wr;
+} __packed;
+
+struct isert_rdma_wr {
+ struct list_head wr_list;
+ struct isert_cmd *isert_cmd;
+ enum iser_ib_op_code iser_ib_op;
+ struct ib_sge *ib_sge;
+ int num_sge;
+ struct scatterlist *sge;
+ int send_wr_num;
+ struct ib_send_wr *send_wr;
+};
+
+struct isert_cmd {
+ uint32_t read_stag;
+ uint32_t write_stag;
+ uint64_t read_va;
+ uint64_t write_va;
+ u64 sense_buf_dma;
+ u32 sense_buf_len;
+ u32 read_va_off;
+ u32 write_va_off;
+ u32 rdma_wr_num;
+ struct isert_conn *conn;
+ struct iscsi_cmd iscsi_cmd;
+ struct ib_sge *ib_sge;
+ struct iser_tx_desc tx_desc;
+ struct isert_rdma_wr rdma_wr;
+ struct work_struct comp_work;
+};
+
+struct isert_device;
+
+struct isert_conn {
+ enum iser_conn_state state;
+ int post_recv_buf_count;
+ atomic_t post_send_buf_count;
+ u32 responder_resources;
+ u32 initiator_depth;
+ u32 max_sge;
+ char *login_buf;
+ char *login_req_buf;
+ char *login_rsp_buf;
+ u64 login_req_dma;
+ u64 login_rsp_dma;
+ unsigned int conn_rx_desc_head;
+ struct isert_rx_desc *conn_rx_descs;
+ struct ib_recv_wr conn_rx_wr[ISERT_MIN_POSTED_RX];
+ struct iscsi_conn *conn;
+ struct list_head conn_accept_node;
+ struct completion conn_login_comp;
+ struct iser_tx_desc conn_login_tx_desc;
+ struct rdma_cm_id *conn_cm_id;
+ struct ib_pd *conn_pd;
+ struct ib_mr *conn_mr;
+ struct ib_qp *conn_qp;
+ struct isert_device *conn_device;
+ struct work_struct conn_logout_work;
+ wait_queue_head_t conn_wait;
+ struct kref conn_kref;
+};
+
+#define ISERT_MAX_CQ 64
+
+struct isert_cq_desc {
+ struct isert_device *device;
+ int cq_index;
+ struct work_struct cq_rx_work;
+ struct work_struct cq_tx_work;
+};
+
+struct isert_device {
+ int cqs_used;
+ int refcount;
+ int cq_active_qps[ISERT_MAX_CQ];
+ struct ib_device *ib_device;
+ struct ib_pd *dev_pd;
+ struct ib_mr *dev_mr;
+ struct ib_cq *dev_rx_cq[ISERT_MAX_CQ];
+ struct ib_cq *dev_tx_cq[ISERT_MAX_CQ];
+ struct isert_cq_desc *cq_desc;
+ struct list_head dev_node;
+};
+
+struct isert_np {
+ wait_queue_head_t np_accept_wq;
+ struct rdma_cm_id *np_cm_id;
+ struct mutex np_accept_mutex;
+ struct list_head np_accept_list;
+ struct completion np_login_comp;
+};
diff --git a/drivers/infiniband/ulp/isert/isert_proto.h b/drivers/infiniband/ulp/isert/isert_proto.h
new file mode 100644
index 0000000..382f820
--- /dev/null
+++ b/drivers/infiniband/ulp/isert/isert_proto.h
@@ -0,0 +1,47 @@
+/* From iscsi_iser.h */
+
+struct iser_hdr {
+ u8 flags;
+ u8 rsvd[3];
+ __be32 write_stag; /* write rkey */
+ __be64 write_va;
+ __be32 read_stag; /* read rkey */
+ __be64 read_va;
+} __packed;
+
+/*Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN 8192
+#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)
+
+/* 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_INFLIGHT_DATAOUTS 8
+
+#define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
+ (1 + ISERT_INFLIGHT_DATAOUTS) + \
+ ISERT_MAX_TX_MISC_PDUS + \
+ ISERT_MAX_RX_MISC_PDUS)
+
+#define ISER_RX_PAD_SIZE (16384 - (ISER_RX_PAYLOAD_SIZE + \
+ sizeof(u64) + sizeof(struct ib_sge)))
+
+#define ISER_VER 0x10
+#define ISER_WSV 0x08
+#define ISER_RSV 0x04
+#define ISCSI_CTRL 0x10
+#define ISER_HELLO 0x20
+#define ISER_HELLORPLY 0x30
--
1.7.2.5