scsi: storvsc: Limit max_sectors for virtual Fibre Channel devices

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commit 010c1e1c57 upstream.

The Hyper-V host is queried to get the max transfer size that it supports,
and this value is used to set max_sectors for the synthetic SCSI
controller.  However, this max transfer size may be too large for virtual
Fibre Channel devices, which are limited to 512 Kbytes.  If a larger
transfer size is used with a vFC device, Hyper-V always returns an error,
and storvsc logs a message like this where the SRB status and SCSI status
are both zero:

hv_storvsc <GUID>: tag#197 cmd 0x8a status: scsi 0x0 srb 0x0 hv 0xc0000001

Add logic to limit the max transfer size to 512 Kbytes for vFC devices.

Fixes: 1d3e098078 ("scsi: storvsc: Correct reporting of Hyper-V I/O size limits")
Cc: stable@vger.kernel.org
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1689887102-32806-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Michael Kelley 2023-07-20 14:05:02 -07:00 • committed by Greg Kroah-Hartman

parent 2c2aa8d0e2

commit d678df66b1

1 changed files with 4 additions and 0 deletions

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drivers/scsi/storvsc_drv.c

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