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[1/1] scsi: storvsc: Handle SRB status value 0x30

Message ID 1688788886-94279-1-git-send-email-mikelley@microsoft.com
State New
Headers show
Series [1/1] scsi: storvsc: Handle SRB status value 0x30 | expand

Commit Message

Michael Kelley July 8, 2023, 4:01 a.m. UTC
In response to a disk I/O request, Hyper-V has been observed to return
SRB status value 0x30.  This indicates the request was not processed
by Hyper-V because low memory conditions on the host caused an internal
error.  The 0x30 status is not recognized by storvsc, so the I/O operation
is not flagged as an error. The request is treated as if it completed
normally but with zero data transferred, causing a flood of retries.

Add a definition for this SRB status value and handle it like
other error statuses from the Hyper-V host.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
 drivers/scsi/storvsc_drv.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Martin K. Petersen July 11, 2023, 7:34 p.m. UTC | #1
Michael,

> In response to a disk I/O request, Hyper-V has been observed to return
> SRB status value 0x30. This indicates the request was not processed by
> Hyper-V because low memory conditions on the host caused an internal
> error. The 0x30 status is not recognized by storvsc, so the I/O
> operation is not flagged as an error. The request is treated as if it
> completed normally but with zero data transferred, causing a flood of
> retries.

Applied to 6.5/scsi-fixes, thanks!
diff mbox series

Patch

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 659196a..7f12d93 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -318,6 +318,7 @@  enum storvsc_request_type {
 #define SRB_STATUS_INVALID_REQUEST	0x06
 #define SRB_STATUS_DATA_OVERRUN		0x12
 #define SRB_STATUS_INVALID_LUN		0x20
+#define SRB_STATUS_INTERNAL_ERROR	0x30
 
 #define SRB_STATUS(status) \
 	(status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))
@@ -978,6 +979,7 @@  static void storvsc_handle_error(struct vmscsi_request *vm_srb,
 	case SRB_STATUS_ERROR:
 	case SRB_STATUS_ABORTED:
 	case SRB_STATUS_INVALID_REQUEST:
+	case SRB_STATUS_INTERNAL_ERROR:
 		if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) {
 			/* Check for capacity change */
 			if ((asc == 0x2a) && (ascq == 0x9)) {