From: Mike Christie <michaelc@xxxxxxxxxxx>
If a task did not complete normally due to a TMF, libiscsi will
now complete the task with the state ISCSI_TASK_ABRT_TMF. Drivers
like bnx2i that need to free resources if a command did not complete normally
can then check the task state. If a driver does not need to send
a special command if we have dropped the session then they can check
for ISCSI_TASK_ABRT_SESS_RECOV.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/infiniband/ulp/iser/iscsi_iser.c | 7 +--
drivers/scsi/libiscsi.c | 60 +++++++++++++++++------------
drivers/scsi/libiscsi_tcp.c | 4 +-
include/scsi/libiscsi.h | 2 +
4 files changed, 41 insertions(+), 32 deletions(-)
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index ffbe0c7..0ba6ec8 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -257,11 +257,8 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
{
struct iscsi_iser_task *iser_task = task->dd_data;
- /*
- * mgmt tasks do not need special cleanup and we do not
- * allocate anything in the init task callout
- */
- if (!task->sc || task->state == ISCSI_TASK_PENDING)
+ /* mgmt tasks do not need special cleanup */
+ if (!task->sc)
return;
if (iser_task->status == ISER_TASK_STATUS_STARTED) {
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index dafa054..b00be6c 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -443,18 +443,20 @@ EXPORT_SYMBOL_GPL(iscsi_put_task);
/**
* iscsi_complete_task - finish a task
* @task: iscsi cmd task
+ * @state: state to complete task with
*
* Must be called with session lock.
*/
-static void iscsi_complete_task(struct iscsi_task *task)
+static void iscsi_complete_task(struct iscsi_task *task, int state)
{
struct iscsi_conn *conn = task->conn;
- if (task->state == ISCSI_TASK_COMPLETED)
+ if (task->state == ISCSI_TASK_COMPLETED ||
+ task->state == ISCSI_TASK_ABRT_TMF ||
+ task->state == ISCSI_TASK_ABRT_SESS_RECOV)
return;
WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
-
- task->state = ISCSI_TASK_COMPLETED;
+ task->state = state;
if (!list_empty(&task->running))
list_del_init(&task->running);
@@ -478,6 +480,7 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
{
struct iscsi_conn *conn = task->conn;
struct scsi_cmnd *sc;
+ int state;
/*
* if a command completes and we get a successful tmf response
@@ -488,14 +491,20 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
if (!sc)
return;
- if (task->state == ISCSI_TASK_PENDING)
+ if (task->state == ISCSI_TASK_PENDING) {
/*
* cmd never made it to the xmit thread, so we should not count
* the cmd in the sequencing
*/
conn->session->queued_cmdsn--;
+ /* it was never sent so just complete like normal */
+ state = ISCSI_TASK_COMPLETED;
+ } else if (err == DID_TRANSPORT_DISRUPTED)
+ state = ISCSI_TASK_ABRT_SESS_RECOV;
+ else
+ state = ISCSI_TASK_ABRT_TMF;
- sc->result = err;
+ sc->result = err << 16;
if (!scsi_bidi_cmnd(sc))
scsi_set_resid(sc, scsi_bufflen(sc));
else {
@@ -503,7 +512,7 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
scsi_in(sc)->resid = scsi_in(sc)->length;
}
- iscsi_complete_task(task);
+ iscsi_complete_task(task, state);
}
static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
@@ -731,7 +740,7 @@ out:
ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
sc, sc->result, task->itt);
conn->scsirsp_pdus_cnt++;
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
}
/**
@@ -769,7 +778,7 @@ iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
"[sc %p res %d itt 0x%x]\n",
sc, sc->result, task->itt);
conn->scsirsp_pdus_cnt++;
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
}
static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
@@ -990,7 +999,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
}
iscsi_tmf_rsp(conn, hdr);
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
break;
case ISCSI_OP_NOOP_IN:
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
@@ -1008,7 +1017,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
goto recv_pdu;
mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
@@ -1020,7 +1029,7 @@ out:
recv_pdu:
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
rc = ISCSI_ERR_CONN_FAILED;
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
return rc;
}
EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
@@ -1262,7 +1271,7 @@ check_mgmt:
struct iscsi_task, running);
list_del_init(&conn->task->running);
if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
- fail_scsi_task(conn->task, DID_IMM_RETRY << 16);
+ fail_scsi_task(conn->task, DID_IMM_RETRY);
continue;
}
rc = iscsi_prep_scsi_cmd_pdu(conn->task);
@@ -1273,7 +1282,7 @@ check_mgmt:
conn->task = NULL;
goto again;
} else
- fail_scsi_task(conn->task, DID_ABORT << 16);
+ fail_scsi_task(conn->task, DID_ABORT);
continue;
}
rc = iscsi_xmit_task(conn);
@@ -1469,7 +1478,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
prepd_reject:
sc->scsi_done = NULL;
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
reject:
spin_unlock(&session->lock);
ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
@@ -1479,7 +1488,7 @@ reject:
prepd_fault:
sc->scsi_done = NULL;
- iscsi_complete_task(task);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
fault:
spin_unlock(&session->lock);
ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
@@ -1665,7 +1674,7 @@ static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
ISCSI_DBG_SESSION(conn->session,
"failing sc %p itt 0x%x state %d\n",
task->sc, task->itt, task->state);
- fail_scsi_task(task, error << 16);
+ fail_scsi_task(task, error);
}
}
@@ -1868,7 +1877,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
}
if (task->state == ISCSI_TASK_PENDING) {
- fail_scsi_task(task, DID_ABORT << 16);
+ fail_scsi_task(task, DID_ABORT);
goto success;
}
@@ -1899,7 +1908,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
* then sent more data for the cmd.
*/
spin_lock(&session->lock);
- fail_scsi_task(task, DID_ABORT << 16);
+ fail_scsi_task(task, DID_ABORT);
conn->tmf_state = TMF_INITIAL;
spin_unlock(&session->lock);
iscsi_start_tx(conn);
@@ -2572,7 +2581,7 @@ static void
fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
{
struct iscsi_task *task;
- int i;
+ int i, state;
for (i = 0; i < conn->session->cmds_max; i++) {
task = conn->session->cmds[i];
@@ -2585,7 +2594,11 @@ fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
ISCSI_DBG_SESSION(conn->session,
"failing mgmt itt 0x%x state %d\n",
task->itt, task->state);
- iscsi_complete_task(task);
+ state = ISCSI_TASK_ABRT_SESS_RECOV;
+ if (task->state == ISCSI_TASK_PENDING)
+ state = ISCSI_TASK_COMPLETED;
+ iscsi_complete_task(task, state);
+
}
}
@@ -2642,10 +2655,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
* flush queues.
*/
spin_lock_bh(&session->lock);
- if (flag == STOP_CONN_RECOVER)
- fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
- else
- fail_scsi_tasks(conn, -1, DID_ERROR);
+ fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
fail_mgmt_tasks(session, conn);
spin_unlock_bh(&session->lock);
mutex_unlock(&session->eh_mutex);
diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index b84a1d8..2bc0709 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -440,8 +440,8 @@ void iscsi_tcp_cleanup_task(struct iscsi_task *task)
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct iscsi_r2t_info *r2t;
- /* nothing to do for mgmt or pending tasks */
- if (!task->sc || task->state == ISCSI_TASK_PENDING)
+ /* nothing to do for mgmt */
+ if (!task->sc)
return;
/* flush task's r2t queues */
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index facae71..196525c 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -86,6 +86,8 @@ enum {
ISCSI_TASK_COMPLETED,
ISCSI_TASK_PENDING,
ISCSI_TASK_RUNNING,
+ ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
+ ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
};
struct iscsi_r2t_info {
--
1.5.2.1
--
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