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[Qemu-devel] [PATCH 4/4] virtio: implement VIRTIO_SCSI_F_TIMEOUT feature
From: |
Hannes Reinecke |
Subject: |
[Qemu-devel] [PATCH 4/4] virtio: implement VIRTIO_SCSI_F_TIMEOUT feature |
Date: |
Fri, 12 May 2017 12:20:57 +0200 |
Implement a handler for the VIRTIO_SCSI_F_TIMEOUT feature, which
allows to pass in the assigned command timeout in seconds or
minutes. This allows to specify a timeout up to 3 hours.
Signed-off-by: Hannes Reinecke <address@hidden>
---
hw/scsi/virtio-scsi.c | 16 ++++++++++++++++
include/standard-headers/linux/virtio_scsi.h | 1 +
2 files changed, 17 insertions(+)
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 46a3e3f280..f1c2f7cb5b 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -534,6 +534,7 @@ static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq
*req)
{
VirtIOSCSICommon *vs = &s->parent_obj;
+ VirtIODevice *vdev = VIRTIO_DEVICE(s);
SCSIDevice *d;
int rc;
@@ -560,6 +561,21 @@ static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI
*s, VirtIOSCSIReq *req)
virtio_scsi_get_lun(req->req.cmd.lun),
req->req.cmd.cdb, req);
+ if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_TIMEOUT)) {
+ int timeout = (int)req->req.cmd.crn;
+
+ if (timeout < 60) {
+ /* Timeouts below 60 are in seconds */
+ req->sreq->timeout = timeout * 1000;
+ } else if (timeout == 255) {
+ /* 255 is infinite timeout */
+ req->sreq->timeout = UINT_MAX;
+ } else {
+ /* Otherwise the timeout is in minutes */
+ req->sreq->timeout = timeout * 1000 * 60;
+ }
+ }
+
if (req->sreq->cmd.mode != SCSI_XFER_NONE
&& (req->sreq->cmd.mode != req->mode ||
req->sreq->cmd.xfer > req->qsgl.size)) {
diff --git a/include/standard-headers/linux/virtio_scsi.h
b/include/standard-headers/linux/virtio_scsi.h
index ab66166b6a..b00e2b95ab 100644
--- a/include/standard-headers/linux/virtio_scsi.h
+++ b/include/standard-headers/linux/virtio_scsi.h
@@ -120,6 +120,7 @@ struct virtio_scsi_config {
#define VIRTIO_SCSI_F_HOTPLUG 1
#define VIRTIO_SCSI_F_CHANGE 2
#define VIRTIO_SCSI_F_T10_PI 3
+#define VIRTIO_SCSI_F_TIMEOUT 4
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
--
2.12.0