Re: [PATCH 04/10] scsi: virtio_scsi: Drop DID_TARGET_FAILURE use.

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On 8/4/22 05:40, Mike Christie wrote:
DID_TARGET_FAILURE is internal to the SCSI layer. Drivers must not use it
because:

1. It's not propagated upwards, so SG IO/passthrough users will not see an
error and think a command was successful.

2. There is no handling for them in scsi_decide_disposition so it results
in the scsi eh running.

It looks like virtio_scsi gets this when something like qemu returns
VIRTIO_SCSI_S_TARGET_FAILURE. It looks like qemu returns that error code
if a host OS returns it, but this shouldn't happen for linux since we
never propagate that error to userspace.

This has us use DID_BAD_TARGET in case some other virt layer is returning
it. In that case we will still get a hard error like before and it conveys
something unexpected happened.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
  drivers/scsi/virtio_scsi.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 578c4b6d0f7d..112d8c3962b0 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -141,7 +141,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
  		set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
  		break;
  	case VIRTIO_SCSI_S_TARGET_FAILURE:
-		set_host_byte(sc, DID_TARGET_FAILURE);
+		set_host_byte(sc, DID_BAD_TARGET);
  		break;
  	case VIRTIO_SCSI_S_NEXUS_FAILURE:
  		set_host_byte(sc, DID_NEXUS_FAILURE);

Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>




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