[dpdk-dev] [PATCH 2/3] net/virtio-user: fix not working with vhost kernel

[Jianfeng Tan <jianfeng.tan@intel.com>]

After reset owner in below patch, we failed to set owner before
sending further vhost messages. It is OK with vhost user implemented
DPDK/VPP/Contrail, but it sees "Operation not permitted" error when
used with vhost kernel.

We fix this by setting owner every time the device is started.

Fixes: 0d6a8752ac9d ("net/virtio-user: fix crash as features change")
Cc: stable@dpdk.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 3b5f737..b5809ee 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -99,6 +99,9 @@ virtio_user_start_device(struct virtio_user_dev *dev)
 	uint64_t features;
 	int ret;
 
+	/* Do not check return as already done in init, or reset in stop */
+	dev->ops->send_request(dev, VHOST_USER_SET_OWNER, NULL);
+
 	/* Step 0: tell vhost to create queues */
 	if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 		goto error;
@@ -332,6 +335,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 		PMD_INIT_LOG(ERR, "backend set up fails");
 		return -1;
 	}
+
 	if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER, NULL) < 0) {
 		PMD_INIT_LOG(ERR, "set_owner fails: %s", strerror(errno));
 		return -1;
-- 
2.7.4