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linux/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 "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)
#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 void
isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
static int
isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct isert_rdma_wr *wr);
static void
isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
static int
isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct isert_rdma_wr *wr);
static int
isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
static int
isert_rdma_post_recvl(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 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 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) {
isert_err("ib_query_device() failed: %d\n", ret);
return ret;
}
isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
return 0;
}
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;
attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
/*
* FIXME: Use devattr.max_sge - 2 for max_send_sge as
* work-around for RDMA_READs with ConnectX-2.
*
* Also, still make sure to have at least two SGEs for
* outgoing control PDU responses.
*/
attr.cap.max_send_sge = max(2, device->dev_attr.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;
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 void
isert_cq_event_callback(struct ib_event *e, void *context)
{
isert_dbg("event: %d\n", e->event);
}
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 = kzalloc(ISERT_QP_MAX_RECV_DTOS *
sizeof(struct iser_rx_desc), GFP_KERNEL);
if (!isert_conn->rx_descs)
goto fail;
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;
}
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;
fail:
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_cq_work(struct work_struct *);
static void isert_cq_callback(struct ib_cq *, void *);
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) {
cancel_work_sync(&comp->work);
ib_destroy_cq(comp->cq);
}
}
kfree(device->comps);
}
static int
isert_alloc_comps(struct isert_device *device,
struct ib_device_attr *attr)
{
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 "
"Fast registration %d pi_capable %d\n",
device->comps_used, device->ib_device->name,
device->ib_device->num_comp_vectors, device->use_fastreg,
device->pi_capable);
device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
GFP_KERNEL);
if (!device->comps) {
isert_err("Unable to allocate completion contexts\n");
return -ENOMEM;
}
max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
for (i = 0; i < device->comps_used; i++) {
struct ib_cq_init_attr cq_attr = {};
struct isert_comp *comp = &device->comps[i];
comp->device = device;
INIT_WORK(&comp->work, isert_cq_work);
cq_attr.cqe = max_cqe;
cq_attr.comp_vector = i;
comp->cq = ib_create_cq(device->ib_device,
isert_cq_callback,
isert_cq_event_callback,
(void *)comp,
&cq_attr);
if (IS_ERR(comp->cq)) {
isert_err("Unable to allocate cq\n");
ret = PTR_ERR(comp->cq);
comp->cq = NULL;
goto out_cq;
}
ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
if (ret)
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_attr *dev_attr;
int ret;
dev_attr = &device->dev_attr;
ret = isert_query_device(device->ib_device, dev_attr);
if (ret)
return ret;
/* asign function handlers */
if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
device->use_fastreg = 1;
device->reg_rdma_mem = isert_reg_rdma;
device->unreg_rdma_mem = isert_unreg_rdma;
} else {
device->use_fastreg = 0;
device->reg_rdma_mem = isert_map_rdma;
device->unreg_rdma_mem = isert_unmap_cmd;
}
ret = isert_alloc_comps(device, dev_attr);
if (ret)
return ret;
device->pd = ib_alloc_pd(device->ib_device);
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 = dev_attr->device_cap_flags &
IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
return 0;
out_cq:
isert_free_comps(device);
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_conn_free_fastreg_pool(struct isert_conn *isert_conn)
{
struct fast_reg_descriptor *fr_desc, *tmp;
int i = 0;
if (list_empty(&isert_conn->fr_pool))
return;
isert_info("Freeing conn %p fastreg pool", isert_conn);
list_for_each_entry_safe(fr_desc, tmp,
&isert_conn->fr_pool, list) {
list_del(&fr_desc->list);
ib_free_fast_reg_page_list(fr_desc->data_frpl);
ib_dereg_mr(fr_desc->data_mr);
if (fr_desc->pi_ctx) {
ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
kfree(fr_desc->pi_ctx);
}
kfree(fr_desc);
++i;
}
if (i < isert_conn->fr_pool_size)
isert_warn("Pool still has %d regions registered\n",
isert_conn->fr_pool_size - i);
}
static int
isert_create_pi_ctx(struct fast_reg_descriptor *desc,
struct ib_device *device,
struct ib_pd *pd)
{
struct pi_context *pi_ctx;
int ret;
pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
if (!pi_ctx) {
isert_err("Failed to allocate pi context\n");
return -ENOMEM;
}
pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
ISCSI_ISER_SG_TABLESIZE);
if (IS_ERR(pi_ctx->prot_frpl)) {
isert_err("Failed to allocate prot frpl err=%ld\n",
PTR_ERR(pi_ctx->prot_frpl));
ret = PTR_ERR(pi_ctx->prot_frpl);
goto err_pi_ctx;
}
pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
ISCSI_ISER_SG_TABLESIZE);
if (IS_ERR(pi_ctx->prot_mr)) {
isert_err("Failed to allocate prot frmr err=%ld\n",
PTR_ERR(pi_ctx->prot_mr));
ret = PTR_ERR(pi_ctx->prot_mr);
goto err_prot_frpl;
}
desc->ind |= ISERT_PROT_KEY_VALID;
pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
if (IS_ERR(pi_ctx->sig_mr)) {
isert_err("Failed to allocate signature enabled mr err=%ld\n",
PTR_ERR(pi_ctx->sig_mr));
ret = PTR_ERR(pi_ctx->sig_mr);
goto err_prot_mr;
}
desc->pi_ctx = pi_ctx;
desc->ind |= ISERT_SIG_KEY_VALID;
desc->ind &= ~ISERT_PROTECTED;
return 0;
err_prot_mr:
ib_dereg_mr(pi_ctx->prot_mr);
err_prot_frpl:
ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
err_pi_ctx:
kfree(pi_ctx);
return ret;
}
static int
isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
struct fast_reg_descriptor *fr_desc)
{
int ret;
fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
ISCSI_ISER_SG_TABLESIZE);
if (IS_ERR(fr_desc->data_frpl)) {
isert_err("Failed to allocate data frpl err=%ld\n",
PTR_ERR(fr_desc->data_frpl));
return PTR_ERR(fr_desc->data_frpl);
}
fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
ISCSI_ISER_SG_TABLESIZE);
if (IS_ERR(fr_desc->data_mr)) {
isert_err("Failed to allocate data frmr err=%ld\n",
PTR_ERR(fr_desc->data_mr));
ret = PTR_ERR(fr_desc->data_mr);
goto err_data_frpl;
}
fr_desc->ind |= ISERT_DATA_KEY_VALID;
isert_dbg("Created fr_desc %p\n", fr_desc);
return 0;
err_data_frpl:
ib_free_fast_reg_page_list(fr_desc->data_frpl);
return ret;
}
static int
isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
{
struct fast_reg_descriptor *fr_desc;
struct isert_device *device = isert_conn->device;
struct se_session *se_sess = isert_conn->conn->sess->se_sess;
struct se_node_acl *se_nacl = se_sess->se_node_acl;
int i, ret, tag_num;
/*
* Setup the number of FRMRs based upon the number of tags
* available to session in iscsi_target_locate_portal().
*/
tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
isert_conn->fr_pool_size = 0;
for (i = 0; i < tag_num; i++) {
fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
if (!fr_desc) {
isert_err("Failed to allocate fast_reg descriptor\n");
ret = -ENOMEM;
goto err;
}
ret = isert_create_fr_desc(device->ib_device,
device->pd, fr_desc);
if (ret) {
isert_err("Failed to create fastreg descriptor err=%d\n",
ret);
kfree(fr_desc);
goto err;
}
list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
isert_conn->fr_pool_size++;
}
isert_dbg("Creating conn %p fastreg pool size=%d",
isert_conn, isert_conn->fr_pool_size);
return 0;
err:
isert_conn_free_fastreg_pool(isert_conn);
return ret;
}
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_completion(&isert_conn->wait);
kref_init(&isert_conn->kref);
mutex_init(&isert_conn->mutex);
spin_lock_init(&isert_conn->pool_lock);
INIT_LIST_HEAD(&isert_conn->fr_pool);
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_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);
}
static int
isert_alloc_login_buf(struct isert_conn *isert_conn,
struct ib_device *ib_dev)
{
int ret;
isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!isert_conn->login_buf) {
isert_err("Unable to allocate isert_conn->login_buf\n");
return -ENOMEM;
}
isert_conn->login_req_buf = isert_conn->login_buf;
isert_conn->login_rsp_buf = isert_conn->login_buf +
ISCSI_DEF_MAX_RECV_SEG_LEN;
isert_dbg("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) {
isert_err("login_req_dma mapping error: %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) {
isert_err("login_rsp_dma mapping error: %d\n", ret);
isert_conn->login_rsp_dma = 0;
goto out_req_dma_map;
}
return 0;
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);
return ret;
}
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;
/* Set max inflight RDMA READ requests */
isert_conn->initiator_depth = min_t(u8,
event->param.conn.initiator_depth,
device->dev_attr.max_qp_init_rd_atom);
isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
ret = isert_conn_setup_qp(isert_conn, cma_id);
if (ret)
goto out_conn_dev;
ret = isert_rdma_post_recvl(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);
if (device->use_fastreg)
isert_conn_free_fastreg_pool(isert_conn);
isert_free_rx_descriptors(isert_conn);
if (isert_conn->cm_id)
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_buf)
isert_free_login_buf(isert_conn);
isert_device_put(device);
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);
}
/**
* isert_conn_terminate() - Initiate connection termination
* @isert_conn: isert connection struct
*
* Notes:
* In case the connection state is FULL_FEATURE, 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;
switch (isert_conn->state) {
case ISER_CONN_TERMINATING:
break;
case ISER_CONN_UP:
case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
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);
break;
default:
isert_warn("conn %p teminating in state %d\n",
isert_conn, isert_conn->state);
}
}
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_np *isert_np = cma_id->context;
struct isert_conn *isert_conn;
bool terminating = false;
if (isert_np->cm_id == cma_id)
return isert_np_cma_handler(cma_id->context, event);
isert_conn = cma_id->qp->qp_context;
mutex_lock(&isert_conn->mutex);
terminating = (isert_conn->state == ISER_CONN_TERMINATING);
isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->mutex);
isert_info("conn %p completing wait\n", isert_conn);
complete(&isert_conn->wait);
if (terminating)
goto out;
mutex_lock(&isert_np->mutex);
if (!list_empty(&isert_conn->node)) {
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);
out:
return 0;
}
static int
isert_connect_error(struct rdma_cm_id *cma_id)
{
struct isert_conn *isert_conn = cma_id->qp->qp_context;
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)
{
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);
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_DEVICE_REMOVAL: /* FALLTHRU */
case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
ret = isert_disconnected_handler(cma_id, event->event);
break;
case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
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, *rx_wr_failed;
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_id = (uintptr_t)rx_desc;
rx_wr->sg_list = &rx_desc->rx_sg;
rx_wr->num_sge = 1;
rx_wr->next = rx_wr + 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->qp, isert_conn->rx_wr,
&rx_wr_failed);
if (ret) {
isert_err("ib_post_recv() failed with ret: %d\n", ret);
isert_conn->post_recv_buf_count -= count;
}
return ret;
}
static int
isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
{
struct ib_recv_wr *rx_wr_failed, rx_wr;
int ret;
rx_wr.wr_id = (uintptr_t)rx_desc;
rx_wr.sg_list = &rx_desc->rx_sg;
rx_wr.num_sge = 1;
rx_wr.next = NULL;
isert_conn->post_recv_buf_count++;
ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
if (ret) {
isert_err("ib_post_recv() failed with ret: %d\n", ret);
isert_conn->post_recv_buf_count--;
}
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->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 = (uintptr_t)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;
ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
if (ret)
isert_err("ib_post_send() failed, ret: %d\n", ret);
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 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);
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 != 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 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;
isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
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_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->device->pd->local_dma_lkey;
isert_dbg("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 = (uintptr_t)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->qp, &rx_wr, &rx_wr_fail);
if (ret) {
isert_err("ib_post_recv() failed: %d\n", ret);
isert_conn->post_recv_buf_count--;
}
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(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->device->pd->local_dma_lkey;
tx_desc->num_sge = 2;
}
if (!login->login_failed) {
if (login->login_complete) {
if (!conn->sess->sess_ops->SessionType &&
isert_conn->device->use_fastreg) {
ret = isert_conn_create_fastreg_pool(isert_conn);
if (ret) {
isert_err("Conn: %p failed to create"
" fastreg pool\n", isert_conn);
return ret;
}
}
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_rdma_post_recvl(isert_conn);
if (ret)
return ret;
}
post_send:
ret = isert_post_send(isert_conn, tx_desc);
if (ret)
return ret;
return 0;
}
static void
isert_rx_login_req(struct isert_conn *isert_conn)
{
struct iser_rx_desc *rx_desc = (void *)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) {
isert_err("Unable to allocate text_in of payload_length: %u\n",
payload_length);
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;
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_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);
isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\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);
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_hdr->flags);
break;
}
rc = isert_rx_opcode(isert_conn, rx_desc,
read_stag, read_va, write_stag, write_va);
}
static void
isert_rcv_completion(struct iser_rx_desc *desc,
struct isert_conn *isert_conn,
u32 xfer_len)
{
struct ib_device *ib_dev = isert_conn->cm_id->device;
struct iscsi_hdr *hdr;
u64 rx_dma;
int rx_buflen;
if ((char *)desc == isert_conn->login_req_buf) {
rx_dma = isert_conn->login_req_dma;
rx_buflen = ISER_RX_LOGIN_SIZE;
isert_dbg("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;
isert_dbg("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;
isert_dbg("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_conn->login_req_len = xfer_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);
} 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--;
}
static int
isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
struct scatterlist *sg, u32 nents, u32 length, u32 offset,
enum iser_ib_op_code op, struct isert_data_buf *data)
{
struct ib_device *ib_dev = isert_conn->cm_id->device;
data->dma_dir = op == ISER_IB_RDMA_WRITE ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
data->len = length - offset;
data->offset = offset;
data->sg_off = data->offset / PAGE_SIZE;
data->sg = &sg[data->sg_off];
data->nents = min_t(unsigned int, nents - data->sg_off,
ISCSI_ISER_SG_TABLESIZE);
data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
PAGE_SIZE);
data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
data->dma_dir);
if (unlikely(!data->dma_nents)) {
isert_err("Cmd: unable to dma map SGs %p\n", sg);
return -EINVAL;
}
isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
return 0;
}
static void
isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
{
struct ib_device *ib_dev = isert_conn->cm_id->device;
ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
memset(data, 0, sizeof(*data));
}
static void
isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
{
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
isert_dbg("Cmd %p\n", isert_cmd);
if (wr->data.sg) {
isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
isert_unmap_data_buf(isert_conn, &wr->data);
}
if (wr->send_wr) {
isert_dbg("Cmd %p free send_wr\n", isert_cmd);
kfree(wr->send_wr);
wr->send_wr = NULL;
}
if (wr->ib_sge) {
isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
kfree(wr->ib_sge);
wr->ib_sge = NULL;
}
}
static void
isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
{
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
isert_dbg("Cmd %p\n", isert_cmd);
if (wr->fr_desc) {
isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
if (wr->fr_desc->ind & ISERT_PROTECTED) {
isert_unmap_data_buf(isert_conn, &wr->prot);
wr->fr_desc->ind &= ~ISERT_PROTECTED;
}
spin_lock_bh(&isert_conn->pool_lock);
list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
spin_unlock_bh(&isert_conn->pool_lock);
wr->fr_desc = NULL;
}
if (wr->data.sg) {
isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
isert_unmap_data_buf(isert_conn, &wr->data);
}
wr->ib_sge = NULL;
wr->send_wr = NULL;
}
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 isert_device *device = isert_conn->device;
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);
}
}
device->unreg_rdma_mem(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_completion_rdma_write(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 isert_conn *isert_conn = isert_cmd->conn;
struct isert_device *device = isert_conn->device;
int ret = 0;
if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
ret = isert_check_pi_status(se_cmd,
wr->fr_desc->pi_ctx->sig_mr);
wr->fr_desc->ind &= ~ISERT_PROTECTED;
}
device->unreg_rdma_mem(isert_cmd, isert_conn);
wr->send_wr_num = 0;
if (ret)
transport_send_check_condition_and_sense(se_cmd,
se_cmd->pi_err, 0);
else
isert_put_response(isert_conn->conn, 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 isert_conn *isert_conn = isert_cmd->conn;
struct isert_device *device = isert_conn->device;
int ret = 0;
if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
ret = isert_check_pi_status(se_cmd,
wr->fr_desc->pi_ctx->sig_mr);
wr->fr_desc->ind &= ~ISERT_PROTECTED;
}
iscsit_stop_dataout_timer(cmd);
device->unreg_rdma_mem(isert_cmd, isert_conn);
cmd->write_data_done = wr->data.len;
wr->send_wr_num = 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);
if (ret) {
target_put_sess_cmd(se_cmd);
transport_send_check_condition_and_sense(se_cmd,
se_cmd->pi_err, 0);
} 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);
case ISTATE_SEND_REJECT: /* FALLTHRU */
case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
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_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 ||
cmd->i_state == ISTATE_SEND_REJECT ||
cmd->i_state == 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;
}
cmd->i_state = ISTATE_SENT_STATUS;
isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
}
static void
isert_snd_completion(struct iser_tx_desc *tx_desc,
struct isert_conn *isert_conn)
{
struct ib_device *ib_dev = isert_conn->cm_id->device;
struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
struct isert_rdma_wr *wr;
if (!isert_cmd) {
isert_unmap_tx_desc(tx_desc, ib_dev);
return;
}
wr = &isert_cmd->rdma_wr;
isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
switch (wr->iser_ib_op) {
case ISER_IB_SEND:
isert_response_completion(tx_desc, isert_cmd,
isert_conn, ib_dev);
break;
case ISER_IB_RDMA_WRITE:
isert_completion_rdma_write(tx_desc, isert_cmd);
break;
case ISER_IB_RDMA_READ:
isert_completion_rdma_read(tx_desc, isert_cmd);
break;
default:
isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
dump_stack();
break;
}
}
/**
* is_isert_tx_desc() - Indicate if the completion wr_id
* is a TX descriptor or not.
* @isert_conn: iser connection
* @wr_id: completion WR identifier
*
* Since we cannot rely on wc opcode in FLUSH errors
* we must work around it by checking if the wr_id address
* falls in the iser connection rx_descs buffer. If so
* it is an RX descriptor, otherwize it is a TX.
*/
static inline bool
is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
{
void *start = isert_conn->rx_descs;
int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
if (wr_id >= start && wr_id < start + len)
return false;
return true;
}
static void
isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
{
if (wc->wr_id == ISER_BEACON_WRID) {
isert_info("conn %p completing wait_comp_err\n",
isert_conn);
complete(&isert_conn->wait_comp_err);
} else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
struct ib_device *ib_dev = isert_conn->cm_id->device;
struct isert_cmd *isert_cmd;
struct iser_tx_desc *desc;
desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
isert_cmd = desc->isert_cmd;
if (!isert_cmd)
isert_unmap_tx_desc(desc, ib_dev);
else
isert_completion_put(desc, isert_cmd, ib_dev, true);
} else {
isert_conn->post_recv_buf_count--;
if (!isert_conn->post_recv_buf_count)
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
}
}
static void
isert_handle_wc(struct ib_wc *wc)
{
struct isert_conn *isert_conn;
struct iser_tx_desc *tx_desc;
struct iser_rx_desc *rx_desc;
isert_conn = wc->qp->qp_context;
if (likely(wc->status == IB_WC_SUCCESS)) {
if (wc->opcode == IB_WC_RECV) {
rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
} else {
tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
isert_snd_completion(tx_desc, isert_conn);
}
} else {
if (wc->status != IB_WC_WR_FLUSH_ERR)
isert_err("%s (%d): wr id %llx vend_err %x\n",
ib_wc_status_msg(wc->status), wc->status,
wc->wr_id, wc->vendor_err);
else
isert_dbg("%s (%d): wr id %llx\n",
ib_wc_status_msg(wc->status), wc->status,
wc->wr_id);
if (wc->wr_id != ISER_FASTREG_LI_WRID)
isert_cq_comp_err(isert_conn, wc);
}
}
static void
isert_cq_work(struct work_struct *work)
{
enum { isert_poll_budget = 65536 };
struct isert_comp *comp = container_of(work, struct isert_comp,
work);
struct ib_wc *const wcs = comp->wcs;
int i, n, completed = 0;
while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
for (i = 0; i < n; i++)
isert_handle_wc(&wcs[i]);
completed += n;
if (completed >= isert_poll_budget)
break;
}
ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
}
static void
isert_cq_callback(struct ib_cq *cq, void *context)
{
struct isert_comp *comp = context;
queue_work(isert_comp_wq, &comp->work);
}
static int
isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
{
struct ib_send_wr *wr_failed;
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,
&wr_failed);
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);
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;
struct isert_device *device = isert_conn->device;
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);
device->unreg_rdma_mem(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);
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);
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 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 isert_device *device = isert_conn->device;
struct ib_device *ib_dev = device->ib_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->wr_id = (uintptr_t)&isert_cmd->tx_desc;
/*
* Perform mapping of TCM scatterlist memory ib_sge dma_addr.
*/
for_each_sg(sg_start, tmp_sg, sg_nents, i) {
isert_dbg("RDMA from SGL dma_addr: 0x%llx 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 = device->pd->local_dma_lkey;
isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
ib_sge->addr, ib_sge->length, ib_sge->lkey);
page_off = 0;
data_left -= ib_sge->length;
if (!data_left)
break;
ib_sge++;
isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
}
send_wr->num_sge = ++i;
isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
send_wr->sg_list, send_wr->num_sge);
return send_wr->num_sge;
}
static int
isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct isert_rdma_wr *wr)
{
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 isert_data_buf *data = &wr->data;
struct ib_send_wr *send_wr;
struct ib_sge *ib_sge;
u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
int ret = 0, i, ib_sge_cnt;
isert_cmd->tx_desc.isert_cmd = isert_cmd;
offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
se_cmd->t_data_nents, se_cmd->data_length,
offset, wr->iser_ib_op, &wr->data);
if (ret)
return ret;
data_left = data->len;
offset = data->offset;
ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
if (!ib_sge) {
isert_warn("Unable to allocate ib_sge\n");
ret = -ENOMEM;
goto unmap_cmd;
}
wr->ib_sge = ib_sge;
wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
GFP_KERNEL);
if (!wr->send_wr) {
isert_dbg("Unable to allocate wr->send_wr\n");
ret = -ENOMEM;
goto unmap_cmd;
}
wr->isert_cmd = isert_cmd;
rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
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->send_flags = 0;
if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
send_wr->opcode = IB_WR_RDMA_WRITE;
send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
send_wr->wr.rdma.rkey = isert_cmd->read_stag;
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];
} else {
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;
if (i + 1 == wr->send_wr_num)
send_wr->send_flags = IB_SEND_SIGNALED;
else
send_wr->next = &wr->send_wr[i + 1];
}
ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
send_wr, data_len, offset);
ib_sge += ib_sge_cnt;
offset += data_len;
va_offset += data_len;
data_left -= data_len;
}
return 0;
unmap_cmd:
isert_unmap_data_buf(isert_conn, data);
return ret;
}
static int
isert_map_fr_pagelist(struct ib_device *ib_dev,
struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
{
u64 start_addr, end_addr, page, chunk_start = 0;
struct scatterlist *tmp_sg;
int i = 0, new_chunk, last_ent, n_pages;
n_pages = 0;
new_chunk = 1;
last_ent = sg_nents - 1;
for_each_sg(sg_start, tmp_sg, sg_nents, i) {
start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
if (new_chunk)
chunk_start = start_addr;
end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
i, (unsigned long long)tmp_sg->dma_address,
tmp_sg->length);
if ((end_addr & ~PAGE_MASK) && i < last_ent) {
new_chunk = 0;
continue;
}
new_chunk = 1;
page = chunk_start & PAGE_MASK;
do {
fr_pl[n_pages++] = page;
isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
n_pages - 1, page);
page += PAGE_SIZE;
} while (page < end_addr);
}
return n_pages;
}
static inline void
isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
{
u32 rkey;
memset(inv_wr, 0, sizeof(*inv_wr));
inv_wr->wr_id = ISER_FASTREG_LI_WRID;
inv_wr->opcode = IB_WR_LOCAL_INV;
inv_wr->ex.invalidate_rkey = mr->rkey;
/* Bump the key */
rkey = ib_inc_rkey(mr->rkey);
ib_update_fast_reg_key(mr, rkey);
}
static int
isert_fast_reg_mr(struct isert_conn *isert_conn,
struct fast_reg_descriptor *fr_desc,
struct isert_data_buf *mem,
enum isert_indicator ind,
struct ib_sge *sge)
{
struct isert_device *device = isert_conn->device;
struct ib_device *ib_dev = device->ib_device;
struct ib_mr *mr;
struct ib_fast_reg_page_list *frpl;
struct ib_send_wr fr_wr, inv_wr;
struct ib_send_wr *bad_wr, *wr = NULL;
int ret, pagelist_len;
u32 page_off;
if (mem->dma_nents == 1) {
sge->lkey = device->pd->local_dma_lkey;
sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
sge->addr, sge->length, sge->lkey);
return 0;
}
if (ind == ISERT_DATA_KEY_VALID) {
/* Registering data buffer */
mr = fr_desc->data_mr;
frpl = fr_desc->data_frpl;
} else {
/* Registering protection buffer */
mr = fr_desc->pi_ctx->prot_mr;
frpl = fr_desc->pi_ctx->prot_frpl;
}
page_off = mem->offset % PAGE_SIZE;
isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
fr_desc, mem->nents, mem->offset);
pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
&frpl->page_list[0]);
if (!(fr_desc->ind & ind)) {
isert_inv_rkey(&inv_wr, mr);
wr = &inv_wr;
}
/* Prepare FASTREG WR */
memset(&fr_wr, 0, sizeof(fr_wr));
fr_wr.wr_id = ISER_FASTREG_LI_WRID;
fr_wr.opcode = IB_WR_FAST_REG_MR;
fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
fr_wr.wr.fast_reg.page_list = frpl;
fr_wr.wr.fast_reg.page_list_len = pagelist_len;
fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
fr_wr.wr.fast_reg.length = mem->len;
fr_wr.wr.fast_reg.rkey = mr->rkey;
fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
if (!wr)
wr = &fr_wr;
else
wr->next = &fr_wr;
ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
if (ret) {
isert_err("fast registration failed, ret:%d\n", ret);
return ret;
}
fr_desc->ind &= ~ind;
sge->lkey = mr->lkey;
sge->addr = frpl->page_list[0] + page_off;
sge->length = mem->len;
isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
sge->addr, sge->length, sge->lkey);
return ret;
}
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)
{
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;
}
return 0;
}
static inline u8
isert_set_prot_checks(u8 prot_checks)
{
return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
(prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
(prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
}
static int
isert_reg_sig_mr(struct isert_conn *isert_conn,
struct se_cmd *se_cmd,
struct isert_rdma_wr *rdma_wr,
struct fast_reg_descriptor *fr_desc)
{
struct ib_send_wr sig_wr, inv_wr;
struct ib_send_wr *bad_wr, *wr = NULL;
struct pi_context *pi_ctx = fr_desc->pi_ctx;
struct ib_sig_attrs sig_attrs;
int ret;
memset(&sig_attrs, 0, sizeof(sig_attrs));
ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
if (ret)
goto err;
sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
wr = &inv_wr;
}
memset(&sig_wr, 0, sizeof(sig_wr));
sig_wr.opcode = IB_WR_REG_SIG_MR;
sig_wr.wr_id = ISER_FASTREG_LI_WRID;
sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
sig_wr.num_sge = 1;
sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
if (se_cmd->t_prot_sg)
sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
if (!wr)
wr = &sig_wr;
else
wr->next = &sig_wr;
ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
if (ret) {
isert_err("fast registration failed, ret:%d\n", ret);
goto err;
}
fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
rdma_wr->ib_sg[SIG].addr = 0;
rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
/*
* We have protection guards on the wire
* so we need to set a larget transfer
*/
rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
rdma_wr->ib_sg[SIG].lkey);
err:
return ret;
}
static int
isert_handle_prot_cmd(struct isert_conn *isert_conn,
struct isert_cmd *isert_cmd,
struct isert_rdma_wr *wr)
{
struct isert_device *device = isert_conn->device;
struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
int ret;
if (!wr->fr_desc->pi_ctx) {
ret = isert_create_pi_ctx(wr->fr_desc,
device->ib_device,
device->pd);
if (ret) {
isert_err("conn %p failed to allocate pi_ctx\n",
isert_conn);
return ret;
}
}
if (se_cmd->t_prot_sg) {
ret = isert_map_data_buf(isert_conn, isert_cmd,
se_cmd->t_prot_sg,
se_cmd->t_prot_nents,
se_cmd->prot_length,
0, wr->iser_ib_op, &wr->prot);
if (ret) {
isert_err("conn %p failed to map protection buffer\n",
isert_conn);
return ret;
}
memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
if (ret) {
isert_err("conn %p failed to fast reg mr\n",
isert_conn);
goto unmap_prot_cmd;
}
}
ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
if (ret) {
isert_err("conn %p failed to fast reg mr\n",
isert_conn);
goto unmap_prot_cmd;
}
wr->fr_desc->ind |= ISERT_PROTECTED;
return 0;
unmap_prot_cmd:
if (se_cmd->t_prot_sg)
isert_unmap_data_buf(isert_conn, &wr->prot);
return ret;
}
static int
isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct isert_rdma_wr *wr)
{
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 fast_reg_descriptor *fr_desc = NULL;
struct ib_send_wr *send_wr;
struct ib_sge *ib_sg;
u32 offset;
int ret = 0;
unsigned long flags;
isert_cmd->tx_desc.isert_cmd = isert_cmd;
offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
se_cmd->t_data_nents, se_cmd->data_length,
offset, wr->iser_ib_op, &wr->data);
if (ret)
return ret;
if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
spin_lock_irqsave(&isert_conn->pool_lock, flags);
fr_desc = list_first_entry(&isert_conn->fr_pool,
struct fast_reg_descriptor, list);
list_del(&fr_desc->list);
spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
wr->fr_desc = fr_desc;
}
ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
if (ret)
goto unmap_cmd;
if (isert_prot_cmd(isert_conn, se_cmd)) {
ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
if (ret)
goto unmap_cmd;
ib_sg = &wr->ib_sg[SIG];
} else {
ib_sg = &wr->ib_sg[DATA];
}
memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
wr->ib_sge = &wr->s_ib_sge;
wr->send_wr_num = 1;
memset(&wr->s_send_wr, 0, sizeof(*send_wr));
wr->send_wr = &wr->s_send_wr;
wr->isert_cmd = isert_cmd;
send_wr = &isert_cmd->rdma_wr.s_send_wr;
send_wr->sg_list = &wr->s_ib_sge;
send_wr->num_sge = 1;
send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
send_wr->opcode = IB_WR_RDMA_WRITE;
send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
send_wr->wr.rdma.rkey = isert_cmd->read_stag;
send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
0 : IB_SEND_SIGNALED;
} else {
send_wr->opcode = IB_WR_RDMA_READ;
send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
send_wr->wr.rdma.rkey = isert_cmd->write_stag;
send_wr->send_flags = IB_SEND_SIGNALED;
}
return 0;
unmap_cmd:
if (fr_desc) {
spin_lock_irqsave(&isert_conn->pool_lock, flags);
list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
}
isert_unmap_data_buf(isert_conn, &wr->data);
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_rdma_wr *wr = &isert_cmd->rdma_wr;
struct isert_conn *isert_conn = conn->context;
struct isert_device *device = isert_conn->device;
struct ib_send_wr *wr_failed;
int rc;
isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
isert_cmd, se_cmd->data_length);
wr->iser_ib_op = ISER_IB_RDMA_WRITE;
rc = device->reg_rdma_mem(conn, cmd, wr);
if (rc) {
isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
return rc;
}
if (!isert_prot_cmd(isert_conn, se_cmd)) {
/*
* 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);
isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
wr->send_wr_num += 1;
rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
if (rc) {
isert_err("ib_post_recv failed with %d\n", rc);
return rc;
}
}
rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
if (rc)
isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
if (!isert_prot_cmd(isert_conn, se_cmd))
isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
"READ\n", isert_cmd);
else
isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
isert_cmd);
return 1;
}
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 = iscsit_priv_cmd(cmd);
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
struct isert_conn *isert_conn = conn->context;
struct isert_device *device = isert_conn->device;
struct ib_send_wr *wr_failed;
int rc;
isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
isert_cmd, se_cmd->data_length, cmd->write_data_done);
wr->iser_ib_op = ISER_IB_RDMA_READ;
rc = device->reg_rdma_mem(conn, cmd, wr);
if (rc) {
isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
return rc;
}
rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
if (rc)
isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
isert_cmd);
return 0;
}
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(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) {
isert_err("Unable to allocate struct isert_np\n");
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;
memset(&cp, 0, sizeof(struct rdma_conn_param));
cp.initiator_depth = isert_conn->initiator_depth;
cp.retry_count = 7;
cp.rnr_retry_count = 7;
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_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);
wait_for_completion(&isert_conn->wait);
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);
}
}
static void
isert_wait4flush(struct isert_conn *isert_conn)
{
struct ib_recv_wr *bad_wr;
isert_info("conn %p\n", isert_conn);
init_completion(&isert_conn->wait_comp_err);
isert_conn->beacon.wr_id = ISER_BEACON_WRID;
/* post an indication that all flush errors were consumed */
if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
isert_err("conn %p failed to post beacon", isert_conn);
return;
}
wait_for_completion(&isert_conn->wait_comp_err);
}
/**
* 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);
/*
* Only wait for wait_comp_err if the isert_conn made it
* into full feature phase..
*/
if (isert_conn->state == ISER_CONN_INIT) {
mutex_unlock(&isert_conn->mutex);
return;
}
isert_conn_terminate(isert_conn);
mutex_unlock(&isert_conn->mutex);
isert_wait4flush(isert_conn);
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;
isert_wait4flush(isert_conn);
isert_put_conn(isert_conn);
}
static struct iscsit_transport iser_target_transport = {
.name = "IB/iSER",
.transport_type = ISCSI_INFINIBAND,
.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_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");
ret = -ENOMEM;
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_VERSION("1.0");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");
module_init(isert_init);
module_exit(isert_exit);
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