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OpenCloudOS-Kernel/drivers/infiniband/ulp/isert/ib_isert.c

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