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path: root/drivers/infiniband/ulp/iser/iscsi_iser.c
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Diffstat (limited to 'drivers/infiniband/ulp/iser/iscsi_iser.c')
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.c107
1 files changed, 79 insertions, 28 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index f42ab14105ac..6a594aac2290 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -97,7 +97,7 @@ module_param_named(pi_enable, iser_pi_enable, bool, 0644);
MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
module_param_named(pi_guard, iser_pi_guard, int, 0644);
-MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:IP_CSUM)");
+MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
static struct workqueue_struct *release_wq;
struct iser_global ig;
@@ -164,18 +164,42 @@ iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
return 0;
}
-int iser_initialize_task_headers(struct iscsi_task *task,
- struct iser_tx_desc *tx_desc)
+/**
+ * iser_initialize_task_headers() - Initialize task headers
+ * @task: iscsi task
+ * @tx_desc: iser tx descriptor
+ *
+ * Notes:
+ * This routine may race with iser teardown flow for scsi
+ * error handling TMFs. So for TMF we should acquire the
+ * state mutex to avoid dereferencing the IB device which
+ * may have already been terminated.
+ */
+int
+iser_initialize_task_headers(struct iscsi_task *task,
+ struct iser_tx_desc *tx_desc)
{
- struct iser_conn *iser_conn = task->conn->dd_data;
+ struct iser_conn *iser_conn = task->conn->dd_data;
struct iser_device *device = iser_conn->ib_conn.device;
struct iscsi_iser_task *iser_task = task->dd_data;
u64 dma_addr;
+ const bool mgmt_task = !task->sc && !in_interrupt();
+ int ret = 0;
+
+ if (unlikely(mgmt_task))
+ mutex_lock(&iser_conn->state_mutex);
+
+ if (unlikely(iser_conn->state != ISER_CONN_UP)) {
+ ret = -ENODEV;
+ goto out;
+ }
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
- if (ib_dma_mapping_error(device->ib_device, dma_addr))
- return -ENOMEM;
+ if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
+ ret = -ENOMEM;
+ goto out;
+ }
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
@@ -183,7 +207,11 @@ int iser_initialize_task_headers(struct iscsi_task *task,
tx_desc->tx_sg[0].lkey = device->mr->lkey;
iser_task->iser_conn = iser_conn;
- return 0;
+out:
+ if (unlikely(mgmt_task))
+ mutex_unlock(&iser_conn->state_mutex);
+
+ return ret;
}
/**
@@ -199,9 +227,14 @@ static int
iscsi_iser_task_init(struct iscsi_task *task)
{
struct iscsi_iser_task *iser_task = task->dd_data;
+ int ret;
- if (iser_initialize_task_headers(task, &iser_task->desc))
- return -ENOMEM;
+ ret = iser_initialize_task_headers(task, &iser_task->desc);
+ if (ret) {
+ iser_err("Failed to init task %p, err = %d\n",
+ iser_task, ret);
+ return ret;
+ }
/* mgmt task */
if (!task->sc)
@@ -508,8 +541,8 @@ iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
*/
if (iser_conn) {
mutex_lock(&iser_conn->state_mutex);
- iscsi_conn_stop(cls_conn, flag);
iser_conn_terminate(iser_conn);
+ iscsi_conn_stop(cls_conn, flag);
/* unbind */
iser_conn->iscsi_conn = NULL;
@@ -541,12 +574,13 @@ iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
static inline unsigned int
iser_dif_prot_caps(int prot_caps)
{
- return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
- SHOST_DIX_TYPE1_PROTECTION : 0) |
- ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
- SHOST_DIX_TYPE2_PROTECTION : 0) |
- ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
- SHOST_DIX_TYPE3_PROTECTION : 0);
+ return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ?
+ SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION |
+ SHOST_DIX_TYPE1_PROTECTION : 0) |
+ ((prot_caps & IB_PROT_T10DIF_TYPE_2) ?
+ SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) |
+ ((prot_caps & IB_PROT_T10DIF_TYPE_3) ?
+ SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0);
}
/**
@@ -569,6 +603,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
struct Scsi_Host *shost;
struct iser_conn *iser_conn = NULL;
struct ib_conn *ib_conn;
+ u16 max_cmds;
shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
if (!shost)
@@ -586,26 +621,41 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
*/
if (ep) {
iser_conn = ep->dd_data;
+ max_cmds = iser_conn->max_cmds;
+
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state != ISER_CONN_UP) {
+ iser_err("iser conn %p already started teardown\n",
+ iser_conn);
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+
ib_conn = &iser_conn->ib_conn;
if (ib_conn->pi_support) {
u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
- if (iser_pi_guard)
- scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
- else
- scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
+ scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
+ SHOST_DIX_GUARD_CRC);
}
- }
- if (iscsi_host_add(shost, ep ?
- ib_conn->device->ib_device->dma_device : NULL))
- goto free_host;
+ if (iscsi_host_add(shost,
+ ib_conn->device->ib_device->dma_device)) {
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ max_cmds = ISER_DEF_XMIT_CMDS_MAX;
+ if (iscsi_host_add(shost, NULL))
+ goto free_host;
+ }
- if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
+ if (cmds_max > max_cmds) {
iser_info("cmds_max changed from %u to %u\n",
- cmds_max, ISER_DEF_XMIT_CMDS_MAX);
- cmds_max = ISER_DEF_XMIT_CMDS_MAX;
+ cmds_max, max_cmds);
+ cmds_max = max_cmds;
}
cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
@@ -911,7 +961,7 @@ static struct scsi_host_template iscsi_iser_sht = {
.module = THIS_MODULE,
.name = "iSCSI Initiator over iSER",
.queuecommand = iscsi_queuecommand,
- .change_queue_depth = iscsi_change_queue_depth,
+ .change_queue_depth = scsi_change_queue_depth,
.sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
.max_sectors = 1024,
.cmd_per_lun = ISER_DEF_CMD_PER_LUN,
@@ -922,6 +972,7 @@ static struct scsi_host_template iscsi_iser_sht = {
.use_clustering = DISABLE_CLUSTERING,
.proc_name = "iscsi_iser",
.this_id = -1,
+ .track_queue_depth = 1,
};
static struct iscsi_transport iscsi_iser_transport = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.