scsi: iscsi: ql4xxx: Use per-session workqueue for unbinding

We currently allocate a workqueue per host and only use it for removing the
target. For the session per host case we could be using this workqueue to
be able to do recoveries (block, unblock, timeout handling) in parallel. To
also allow offload drivers to do their session recoveries in parallel, this
drops the per host workqueue and replaces it with a per session one.

Link: https://lore.kernel.org/r/20220226230435.38733-5-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 17 insertions, 6 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index b49c38416fb9..3f6cb2a5c2c2 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -5096,7 +5096,7 @@ int qla4xxx_unblock_flash_ddb(struct iscsi_cls_session *cls_session)
 		ql4_printk(KERN_INFO, ha, "scsi%ld: %s: ddb[%d]"
 			   " start scan\n", ha->host_no, __func__,
 			   ddb_entry->fw_ddb_index);
-		scsi_queue_work(ha->host, &ddb_entry->sess->scan_work);
+		queue_work(ddb_entry->sess->workq, &ddb_entry->sess->scan_work);
 	}
 	return QLA_SUCCESS;
 }
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 05cd4bca979e..ecb592a70e03 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2032,19 +2032,27 @@ EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 
 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 {
+	struct Scsi_Host *shost = iscsi_session_to_shost(session);
 	unsigned long flags;
 	int id = 0;
 	int err;
 
 	session->sid = atomic_add_return(1, &iscsi_session_nr);
 
+	session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
+			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
+			shost->host_no, session->sid);
+	if (!session->workq)
+		return -ENOMEM;
+
 	if (target_id == ISCSI_MAX_TARGET) {
 		id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
 
 		if (id < 0) {
 			iscsi_cls_session_printk(KERN_ERR, session,
 					"Failure in Target ID Allocation\n");
-			return id;
+			err = id;
+			goto destroy_wq;
 		}
 		session->target_id = (unsigned int)id;
 		session->ida_used = true;
@@ -2078,7 +2086,8 @@ release_dev:
 release_ida:
 	if (session->ida_used)
 		ida_simple_remove(&iscsi_sess_ida, session->target_id);
-
+destroy_wq:
+	destroy_workqueue(session->workq);
 	return err;
 }
 EXPORT_SYMBOL_GPL(iscsi_add_session);
@@ -2177,6 +2186,8 @@ void iscsi_remove_session(struct iscsi_cls_session *session)
 
 	transport_unregister_device(&session->dev);
 
+	destroy_workqueue(session->workq);
+
 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
 	device_del(&session->dev);
 }
@@ -3833,8 +3844,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 	case ISCSI_UEVENT_UNBIND_SESSION:
 		session = iscsi_session_lookup(ev->u.d_session.sid);
 		if (session)
-			scsi_queue_work(iscsi_session_to_shost(session),
-					&session->unbind_work);
+			queue_work(session->workq, &session->unbind_work);
 		else
 			err = -EINVAL;
 		break;
@@ -4707,7 +4717,6 @@ iscsi_register_transport(struct iscsi_transport *tt)
 	INIT_LIST_HEAD(&priv->list);
 	priv->iscsi_transport = tt;
 	priv->t.user_scan = iscsi_user_scan;
-	priv->t.create_work_queue = 1;
 
 	priv->dev.class = &iscsi_transport_class;
 	dev_set_name(&priv->dev, "%s", tt->name);
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 90b55db46d7c..7a0d24d3b916 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -251,6 +251,8 @@ struct iscsi_cls_session {
 	bool recovery_tmo_sysfs_override;
 	struct delayed_work recovery_work;
 
+	struct workqueue_struct *workq;
+
 	unsigned int target_id;
 	bool ida_used;