[dpdk-dev] [PATCH] net/virtio-user: fix multiple queues fail in server mode

[zhiyong.yang@intel.com]

This patch fixes multiple queues failure when virtio-user works in
server mode.

Fixes: bd8f50a45d0f ("net/virtio-user: support server mode")
Cc: stable@dpdk.org
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
---
 drivers/net/virtio/virtio_user/vhost_user.c      | 3 +++
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index a6df97a00..a9e53d7b5 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -263,6 +263,9 @@ vhost_user_sock(struct virtio_user_dev *dev,
 
 	PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
 
+	if (vhostfd < 0)
+		return -1;
+
 	msg.request = req;
 	msg.flags = VHOST_USER_VERSION;
 	msg.size = 0;
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 38b8bc90d..e988dc3f4 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -126,6 +126,10 @@ virtio_user_start_device(struct virtio_user_dev *dev)
 	features &= ~(1ull << VIRTIO_NET_F_MAC);
 	/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 	features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
+	/* Also disable features which depend on VIRTIO_NET_F_CTRL_VQ */
+	features &= ~(1ull << VIRTIO_NET_F_CTRL_RX);
+	features &= ~(1ull << VIRTIO_NET_F_CTRL_VLAN);
+	features &= ~(1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 	features &= ~(1ull << VIRTIO_NET_F_STATUS);
 	ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
 	if (ret < 0)
@@ -488,6 +492,11 @@ virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 		queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 		status = virtio_user_handle_mq(dev, queues);
 	}
+	/* Server mode can't enable queue pairs if vhostfd is not connected,
+	 * we suppose that status always returns 0 in this case.
+	 * /
+	if (dev->is_server && dev->vhostfd < 0)
+		status = 0;
 
 	/* Update status */
 	*(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
-- 
2.14.3