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virtio/user: negotiate VHOST_USER_PROTOCOL_F_MQ

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Required by the vhost-user spec.

Change-Id: Id7143a0f6cc34463ad5f22d8db96ac5c51e04081
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/417457
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Dariusz Stojaczyk 2018-07-02 12:54:11 +02:00 committed by Jim Harris
parent 5910855c68
commit 0b9e4c8ff7
2 changed files with 14 additions and 1 deletions
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11
lib/virtio/virtio_user.c
View File

@ -47,7 +47,7 @@
#include "spdk_internal/virtio.h"
#define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES \
(0)
((1ULL << VHOST_USER_PROTOCOL_F_MQ))
static int
virtio_user_create_queue(struct virtio_dev *vdev, uint32_t queue_sel)
@ -145,6 +145,15 @@ virtio_user_start_device(struct virtio_dev *vdev)
uint64_t host_max_queues;
int ret;
if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) == 0 &&
vdev->max_queues > 1 + vdev->fixed_queues_num) {
SPDK_WARNLOG("%s: requested %"PRIu16" request queues, but the "
"host doesn't support VHOST_USER_PROTOCOL_F_MQ. "
"Only one request queue will be used.\n",
vdev->name, vdev->max_queues - vdev->fixed_queues_num);
vdev->max_queues = 1 + vdev->fixed_queues_num;
}
/* negotiate the number of I/O queues. */
ret = dev->ops->send_request(dev, VHOST_USER_GET_QUEUE_NUM, &host_max_queues);
if (ret < 0) {

4
lib/virtio/virtio_user/vhost.h
View File

@ -43,6 +43,10 @@
#define VHOST_USER_MAX_CONFIG_SIZE 256
#ifndef VHOST_USER_PROTOCOL_F_MQ
#define VHOST_USER_PROTOCOL_F_MQ 0
#endif
enum vhost_user_request {
VHOST_USER_NONE = 0,
VHOST_USER_GET_FEATURES = 1,