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isci: Add decode for SMP request retry error condition

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There are situations with slow expanders in which a first attempt
to execute an SMP request will fail with a timeout.  Immediate
subsequent retries will generally succeed.  This change makes sure
SMP I/O failures are immediately failed to libsas so that retries
happen with no discovery process timeout delay.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jeff Skirvin
2011-06-20 14:09:06 -07:00
committed by Dan Williams
parent 61aaff49e2
commit cde76fbf1f
2 changed files with 52 additions and 10 deletions
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27
drivers/scsi/isci/task.h
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@@ -301,6 +301,27 @@ isci_task_set_completion_status(
task->task_status.stat = status;
switch (task_notification_selection) {
case isci_perform_error_io_completion:
if (task->task_proto == SAS_PROTOCOL_SMP) {
/* There is no error escalation in the SMP case.
* Convert to a normal completion to avoid the
* timeout in the discovery path and to let the
* next action take place quickly.
*/
task_notification_selection
= isci_perform_normal_io_completion;
/* Fall through to the normal case... */
} else {
/* Use sas_task_abort */
/* Leave SAS_TASK_STATE_DONE clear
* Leave SAS_TASK_AT_INITIATOR set.
*/
break;
}
case isci_perform_aborted_io_completion:
/* This path can occur with task-managed requests as well as
* requests terminated because of LUN or device resets.
@@ -313,12 +334,6 @@ isci_task_set_completion_status(
default:
WARN_ONCE(1, "unknown task_notification_selection: %d\n",
task_notification_selection);
/* Fall through to the error case... */
case isci_perform_error_io_completion:
/* Use sas_task_abort */
/* Leave SAS_TASK_STATE_DONE clear
* Leave SAS_TASK_AT_INITIATOR set.
*/
break;
}