[Trusty SRU] patch for "lpfc: iotag is out of range: max iotag"

[Mauricio Faria de Oliveira]

SRU Justification:

[Impact]

The following issue occurs with the lpfc driver, seen under I/O stress.

> [ 177.972210] lpfc 0000:00:05.0: 0:0369 No entry from fast-path completion
> queue fcpcqid=1
> [ 355.950403] lpfc 0000:00:04.0: 1:0372 iotag x85d is out off range: max
> iotag (xa10)
> [ 421.007268] lpfc 0000:00:04.0: 1:(0):0748 abort handler timed out waiting
> for abortng I/O (xri:xdf7) to complete: ret 0x2003, ID 0, LUN 2
> [ 421.008177] lpfc 0000:00:04.0: 1:(0):0727 TMF FCP_LUN_RESET to TGT 0 LUN
> 2 failed (1, 4096) iocb_flag x6
> [ 421.008309] lpfc 0000:00:04.0: 1:(0):0713 SCSI layer issued Device Reset
> (0, 2) return x2002
> [ 481.017214] lpfc 0000:00:04.0: 1:(0):0724 I/O flush failure for context
> LUN : cnt x1
> [ 481.019292] lpfc 0000:00:04.0: 1:(0):0727 TMF FCP_TARGET_RESET to TGT 0
> LUN 2 failed (1, 4096) iocb_flag x6
> [ 481.019398] lpfc 0000:00:04.0: 1:(0):0723 SCSI layer issued Target Reset
> (0, 2) return x2002
> [ 541.027198] lpfc 0000:00:04.0: 1:(0):0724 I/O flush failure for context
> TGT : cnt x1
> [ 541.029168] lpfc 0000:00:04.0: 1:(0):0727 TMF FCP_TARGET_RESET to TGT 0
> LUN 0 failed (1, 4096) iocb_flag x6
...
> [ 601.037193] lpfc 0000:00:04.0: 1:(0):0724 I/O flush failure for context
> HOST : cnt x1
> [ 601.037291] lpfc 0000:00:04.0: 1:(0):0714 SCSI layer issued Bus Reset
> Data: x2003
> [ 601.037388] lpfc 0000:00:04.0: 1:(0):3172 SCSI layer issued Host Reset
> Data:
> [ 603.560526] lpfc 0000:00:04.0: 1:1303 Link Up Event x1 received Data: x1
> x0 x80 x0 x0 x0 0
> [ 612.687916] sd 2:0:0:0: timing out command, waited 30s
> [ 612.689217] sd 2:0:0:1: timing out command, waited 30s
> [ 612.690407] sd 2:0:0:3: timing out command, waited 30s
> [ 612.694220] sd 2:0:0:4: timing out command, waited 30s
> [ 634.667144] rport-2:0-4: blocked FC remote port time out: removing rport

[Fix]

27f344eb15dd0da80ebec80c7245e8c85043f841 lpfc: Add iotag memory barrier

Tested on top of linux 3.13.0-55.94 (applies cleanly; cherrypick)

[Test Case]
Stress I/O using the lpfc driver.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1468416

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Chris J Arges (arges)]

Sent to kteam ML.

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Mauricio Faria de Oliveira (mfo)]

Verification done, the kernel in -proposed solves the problem.
Tag updated.
Thanks!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-58.97

---------------
linux (3.13.0-58.97) trusty; urgency=low

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