Commit b8d26b3b authored by Nicholas Bellinger's avatar Nicholas Bellinger

iser-target: Add iSCSI Extensions for RDMA (iSER) target driver

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.

v5 changes:

- Use ISER_RECV_DATA_SEG_LEN instead of hardcoded value in ISER_RX_PAD_SIZE (Or)
- Fix make W=1 warnings (Or)
- Add missing depends on NET && INFINIBAND_ADDR_TRANS in Kconfig (Randy + Or)
- Make isert_device_find_by_ib_dev() return proper ERR_PTR (Wei Yongjun)
- Properly setup iscsi_np->np_sockaddr in isert_setup_np() (Shlomi + nab)
- Add special case for early ISCSI_OP_SCSI_CMD exception handling (nab)

v4 changes:
- Mark isert_cq_rx_work as static (Or)
- Drop unnecessary ib_dma_sync_single_for_cpu + ib_dma_sync_single_for_device
  calls for isert_cmd->sense_buf_dma from isert_put_response (Or)
- Use 12288 for ISER_RX_PAD_SIZE base to save extra page per
  struct iser_rx_desc (Or + nab)
- Drop now unnecessary isert_rx_desc usage, and convert RX users to
  iser_rx_desc (Or + nab)
- Move isert_[alloc,free]_rx_descriptors() ahead of
  isert_create_device_ib_res() usage (nab)
- Mark isert_cq_[rx,tx]_callback() + prototypes as static
- Fix 'warning: 'ret' may be used uninitialized' warning for
  isert_create_device_ib_res on powerpc allmodconfig (fengguang + nab)
- Fix 'warning: 'ret' may be used uninitialized' warning for
  isert_connect_request on i386 allyesconfig (fengguang + nab)
- Fix pr_debug conversion specification in isert_rx_completion()
  (fengguang + nab)
- Drop unnecessary isert_conn->conn_cm_id != NULL check in
  isert_connect_release causing the build warning:
  "variable dereferenced before check 'isert_conn->conn_cm_id'"
- Fix isert_lid + isert_np leak in isert_setup_np failure path
- Add isert_conn->conn_wait_comp_err usage in isert_free_conn()
  for isert_cq_comp_err completion path
- Add isert_conn->logout_posted bit to determine decrement of
  isert_conn->post_send_buf_count from logout response completion
- Always set ISER_CONN_DOWN from isert_disconnect_work() callback

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: default avatarOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 04b59bab
......@@ -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
......@@ -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-$(CONFIG_INFINIBAND_ISERT) += ulp/isert/
config INFINIBAND_ISERT
tristate "iSCSI Extentions for RDMA (iSER) target support"
depends on INET && INFINIBAND_ADDR_TRANS && TARGET_CORE && ISCSI_TARGET
---help---
Support for iSCSI Extentions for RDMA (iSER) Target on Infiniband fabrics.
ccflags-y := -Idrivers/target -Idrivers/target/iscsi
obj-$(CONFIG_INFINIBAND_ISERT) += ib_isert.o
/*******************************************************************************
* 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);
}
static int
isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
{
struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
struct iser_rx_desc *rx_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 iser_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++) {
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 = 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++) {
ib_dma_unmap_single(ib_dev, rx_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;
}
static void
isert_free_rx_descriptors(struct isert_conn *isert_conn)
{
struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
struct iser_rx_desc *rx_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++) {
ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
}
kfree(isert_conn->conn_rx_descs);
isert_conn->conn_rx_descs = NULL;
}
static void isert_cq_tx_callback(struct ib_cq *, void *);
static void isert_cq_rx_callback(struct ib_cq *, void *);
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 = 0, 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;
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++;
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);
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 = 0;
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);
init_waitqueue_head(&isert_conn->conn_wait_comp_err);
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 (IS_ERR(device)) {
ret = PTR_ERR(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);
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");
isert_conn->state = ISER_CONN_DOWN;
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");
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 iser_rx_desc *rx_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];
rx_wr->wr_id = (unsigned long)rx_desc;
rx_wr->sg_list = &rx_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_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_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 iser_rx_desc *rx_desc, int rx_buflen,
struct isert_conn *isert_conn)
{
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 *)&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);
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, &rx_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 iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
{
struct iser_hdr *iser_hdr = &rx_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, rx_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 iscsi_hdr *hdr;
u64 rx_dma;
int rx_buflen, outstanding;
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: %d\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(desc, xfer_len - ISER_HEADERS_LEN,
isert_conn);
else
isert_rx_do_work(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()
*/
isert_conn->logout_posted = true;
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_TERMINATING;
wake_up(&isert_conn->conn_wait_comp_err);
}
}
static 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);
}
static 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);
}
static 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);
}
static 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;
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;
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:
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);
/*
* Setup the np->np_sockaddr from the passed sockaddr setup
* in iscsi_target_configfs.c code..
*/
memcpy(&np->np_sockaddr, ksockaddr,
sizeof(struct __kernel_sockaddr_storage));
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));
ret = PTR_ERR(isert_lid);
goto out;
}
ret = rdma_bind_addr(isert_lid, sa);
if (ret) {
pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
goto out_lid;
}
ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
if (ret) {
pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
goto out_lid;
}
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;
out_lid:
rdma_destroy_id(isert_lid);
out:
kfree(isert_np);
return ret;
}
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_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: Starting \n");
/*
* Decrement post_send_buf_count for special case when called
* from isert_do_control_comp() -> iscsit_logout_post_handler()
*/
if (isert_conn->logout_posted)
atomic_dec(&isert_conn->post_send_buf_count);
if (isert_conn->conn_cm_id)
rdma_disconnect(isert_conn->conn_cm_id);
/*
* Only wait for conn_wait_comp_err if the isert_conn made it
* into full feature phase..
*/
if (isert_conn->state > ISER_CONN_INIT) {
pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
isert_conn->state);
wait_event(isert_conn->conn_wait_comp_err,
isert_conn->state == ISER_CONN_TERMINATING);
pr_debug("isert_free_conn: After wait_event #1 >>>>>>>>>>>>\n");
}
pr_debug("isert_free_conn: wait_event conn_wait %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 #2 >>>>>>>>>>>>>>>>>>>>\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");
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);
#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 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;
bool logout_posted;
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 iser_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;
wait_queue_head_t conn_wait_comp_err;
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;
};
/* 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 (ISER_RECV_DATA_SEG_LEN + 4096 - \
(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
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