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

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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>
This commit is contained in:
Mike Christie 2022-02-26 17:04:33 -06:00 committed by Martin K. Petersen
parent d8ec5d67b8
commit 5842ea3668
3 changed files with 17 additions and 6 deletions
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2
drivers/scsi/qla4xxx/ql4_os.c
View file

@ -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;
}

19
drivers/scsi/scsi_transport_iscsi.c
View file

@ -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 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
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);

2
include/scsi/scsi_transport_iscsi.h
View file

@ -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;