Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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# gpg:                using RSA key 215D46F48246689EC77F3562EF04965B398D6211
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* tag 'net-pull-request' of https://github.com/jasowang/qemu:
  net/passt: Implement vhost-user backend support
  net: Add passt network backend
  net: Add is_vhost_user flag to vhost_net struct
  net: Allow network backends to advertise max TX queue size
  net: Add save_acked_features callback to vhost_net
  net: Add get_acked_features callback to VhostNetOptions
  net: Consolidate vhost feature bits into vhost_net structure
  net: Add get_vhost_net callback to NetClientInfo
  vhost_net: Rename vhost_set_vring_enable() for clarity
  net: Define net_client_set_link()
  net: Refactor stream logic for reuse in '-net passt'
  virtio-net: Add queues for RSS during migration
  net: fix buffer overflow in af_xdp_umem_create()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 24 insertions, 23 deletions

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index eb93607b8c..00df5fd6cd 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -670,34 +670,36 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
 static int virtio_net_max_tx_queue_size(VirtIONet *n)
 {
     NetClientState *peer = n->nic_conf.peers.ncs[0];
+    struct vhost_net *net;
 
-    /*
-     * Backends other than vhost-user or vhost-vdpa don't support max queue
-     * size.
-     */
     if (!peer) {
-        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
+        goto default_value;
     }
 
-    switch(peer->info->type) {
-    case NET_CLIENT_DRIVER_VHOST_USER:
-    case NET_CLIENT_DRIVER_VHOST_VDPA:
-        return VIRTQUEUE_MAX_SIZE;
-    default:
-        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
-    };
+    net = get_vhost_net(peer);
+
+    if (!net || !net->max_tx_queue_size) {
+        goto default_value;
+    }
+
+    return net->max_tx_queue_size;
+
+default_value:
+    return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
 }
 
 static int peer_attach(VirtIONet *n, int index)
 {
     NetClientState *nc = qemu_get_subqueue(n->nic, index);
+    struct vhost_net *net;
 
     if (!nc->peer) {
         return 0;
     }
 
-    if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
-        vhost_set_vring_enable(nc->peer, 1);
+    net = get_vhost_net(nc->peer);
+    if (net && net->is_vhost_user) {
+        vhost_net_set_vring_enable(nc->peer, 1);
     }
 
     if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
@@ -714,13 +716,15 @@ static int peer_attach(VirtIONet *n, int index)
 static int peer_detach(VirtIONet *n, int index)
 {
     NetClientState *nc = qemu_get_subqueue(n->nic, index);
+    struct vhost_net *net;
 
     if (!nc->peer) {
         return 0;
     }
 
-    if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
-        vhost_set_vring_enable(nc->peer, 0);
+    net = get_vhost_net(nc->peer);
+    if (net && net->is_vhost_user) {
+        vhost_net_set_vring_enable(nc->peer, 0);
     }
 
     if (nc->peer->info->type !=  NET_CLIENT_DRIVER_TAP) {
@@ -3022,11 +3026,10 @@ static void virtio_net_del_queue(VirtIONet *n, int index)
     virtio_del_queue(vdev, index * 2 + 1);
 }
 
-static void virtio_net_change_num_queue_pairs(VirtIONet *n, int new_max_queue_pairs)
+static void virtio_net_change_num_queues(VirtIONet *n, int new_num_queues)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(n);
     int old_num_queues = virtio_get_num_queues(vdev);
-    int new_num_queues = new_max_queue_pairs * 2 + 1;
     int i;
 
     assert(old_num_queues >= 3);
@@ -3062,16 +3065,14 @@ static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
     int max = multiqueue ? n->max_queue_pairs : 1;
 
     n->multiqueue = multiqueue;
-    virtio_net_change_num_queue_pairs(n, max);
+    virtio_net_change_num_queues(n, max * 2 + 1);
 
     virtio_net_set_queue_pairs(n);
 }
 
-static int virtio_net_pre_load_queues(VirtIODevice *vdev)
+static int virtio_net_pre_load_queues(VirtIODevice *vdev, uint32_t n)
 {
-    virtio_net_set_multiqueue(VIRTIO_NET(vdev),
-                              virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_RSS) ||
-                              virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MQ));
+    virtio_net_change_num_queues(VIRTIO_NET(vdev), n);
 
     return 0;
 }