On 11/22/24 13:11, Michael Kelley wrote:
From: Cathy Avery <cavery@xxxxxxxxxx> Sent: Friday, November 22, 2024 8:24 AM
This patch partially reverts
commit 812fe6420a6e789db68f18cdb25c5c89f4561334
Author: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Date: Fri Aug 25 10:21:24 2023 -0700
scsi: storvsc: Handle additional SRB status values
HyperV does not support MAINTENANCE_IN resulting in FC passthrough
returning the SRB_STATUS_DATA_OVERRUN value. Now that
SRB_STATUS_DATA_OVERRUN
is treated as an error multipath ALUA paths go into a faulty state as multipath
ALUA submits RTPG commands via MAINTENANCE_IN.
[ 3.215560] hv_storvsc 1d69d403-9692-4460-89f9-a8cbcc0f94f3:
tag#230 cmd 0xa3 status: scsi 0x0 srb 0x12 hv 0xc0000001
[ 3.215572] scsi 1:0:0:32: alua: rtpg failed, result 458752
This patch essentially restores the previous handling of MAINTENANCE_IN
along with supressing any logging noise.
Signed-off-by: Cathy Avery <cavery@xxxxxxxxxx>
---
drivers/scsi/storvsc_drv.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 7ceb982040a5..088fefe40999 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -149,6 +149,8 @@ struct hv_fc_wwn_packet {
*/
static int vmstor_proto_version;
+static bool hv_dev_is_fc(struct hv_device *hv_dev);
+
#define STORVSC_LOGGING_NONE 0
#define STORVSC_LOGGING_ERROR 1
#define STORVSC_LOGGING_WARN 2
@@ -980,6 +982,13 @@ static void storvsc_handle_error(struct vmscsi_request
*vm_srb,
void (*process_err_fn)(struct work_struct *work);
struct hv_host_device *host_dev = shost_priv(host);
+ // HyperV FC does not support MAINTENANCE_IN ignore
+ if ((scmnd->cmnd[0] == MAINTENANCE_IN) &&
+ (SRB_STATUS(vm_srb->srb_status) == SRB_STATUS_DATA_OVERRUN) &&
+ hv_dev_is_fc(host_dev->dev)) {
+ return;
+ }
+
Could use the following coding instead to avoid the explicit check of srb_status:
@@ -981,6 +981,16 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
struct hv_host_device *host_dev = shost_priv(host);
switch (SRB_STATUS(vm_srb->srb_status)) {
+ case SRB_STATUS_DATA_OVERRUN:
+ /*
+ * Hyper-V does not support MAINTENANCE_IN, resulting in FC
+ * passthrough returning DATA_OVERRUN. But treating as an
+ * error incorrectly puts ALUA paths into a fault state.
+ */
+ if ((scmnd->cmnd[0] == MAINTENANCE_IN) &&
+ hv_dev_is_fc(host_dev->dev))
+ return;
+ fallthrough;
case SRB_STATUS_ERROR:
case SRB_STATUS_ABORTED:
case SRB_STATUS_INVALID_REQUEST:
@@ -988,7 +998,6 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
case SRB_STATUS_TIMEOUT:
case SRB_STATUS_SELECTION_TIMEOUT:
case SRB_STATUS_BUS_RESET:
- case SRB_STATUS_DATA_OVERRUN:
if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID) {
/* Check for capacity change */
switch (SRB_STATUS(vm_srb->srb_status)) {
case SRB_STATUS_ERROR:
case SRB_STATUS_ABORTED:
@@ -1161,6 +1170,12 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device,
stor_pkt->vm_srb.sense_info_length = min_t(u8, STORVSC_SENSE_BUFFER_SIZE,
vstor_packet->vm_srb.sense_info_length);
+ // HyperV FC does not support MAINTENANCE_IN ignore
For consistency, prefer to not use C++ style comments.
+ if ((SRB_STATUS(vstor_packet->vm_srb.srb_status) == SRB_STATUS_DATA_OVERRUN) &&
+ (stor_pkt->vm_srb.cdb[0] == MAINTENANCE_IN) &&
+ hv_dev_is_fc(device))
+ goto skip_logging;
+
Just wondering: There's already a hack earlier in this function for
INQUIRY and MODE_SENSE commands that sets scsi_status and
srb_status to indicate success. What if this case did the same? Then
nothing would be logged, and a special case would not be needed in
storvsc_handle_error(). Or do you still need the error and sense info to
propagate to higher levels? (in which case what you've done here is OK)
Michael
It sounds like a reasonable idea. I'll try it out.
Cathy
if (vstor_packet->vm_srb.scsi_status != 0 ||
vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS) {
@@ -1181,6 +1196,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device,
vstor_packet->status);
}
+skip_logging:
if (vstor_packet->vm_srb.scsi_status == SAM_STAT_CHECK_CONDITION &&
(vstor_packet->vm_srb.srb_status & SRB_STATUS_AUTOSENSE_VALID))
memcpy(request->cmd->sense_buffer,
--
2.42.0
