scsi: qla2xxx: Disable ATIO interrupt coalesce for quad port ISP27XX
authorTony Battersby <tonyb@cybernetics.com>
Thu, 7 Jul 2022 19:08:01 +0000 (15:08 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 15 Sep 2022 09:30:00 +0000 (11:30 +0200)
commit8179f0e08578ec4a1db1acf3ab8fac826864ed50
tree6e0ab357dd136351f0659fe6d274bc64bf863cdc
parent625c78e1ae355474ea47b980337a9c3ca4195814
scsi: qla2xxx: Disable ATIO interrupt coalesce for quad port ISP27XX

[ Upstream commit 53661ded2460b414644532de6b99bd87f71987e9 ]

This partially reverts commit d2b292c3f6fd ("scsi: qla2xxx: Enable ATIO
interrupt handshake for ISP27XX")

For some workloads where the host sends a batch of commands and then
pauses, ATIO interrupt coalesce can cause some incoming ATIO entries to be
ignored for extended periods of time, resulting in slow performance,
timeouts, and aborted commands.

Disable interrupt coalesce and re-enable the dedicated ATIO MSI-X
interrupt.

Link: https://lore.kernel.org/r/97dcf365-89ff-014d-a3e5-1404c6af511c@cybernetics.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/scsi/qla2xxx/qla_target.c