[PULL v2 23/47] virtio-net: Unlimit tx queue size if peer is vdpa

[Michael S. Tsirkin]

From: Eugenio Pérez <eperezma@redhat.com>

The code used to limit the maximum size of tx queue for others backends
than vhost_user since the introduction of configurable tx queue size in
9b02e1618cf2 ("virtio-net: enable configurable tx queue size").

As vhost_user, vhost_vdpa devices should deal with memory region
crosses already, so let's use the full tx size.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20220217175029.2517071-1-eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/net/virtio-net.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index cf8ab0f8af..b02a0632df 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -628,17 +628,20 @@ static int virtio_net_max_tx_queue_size(VirtIONet *n)
     NetClientState *peer = n->nic_conf.peers.ncs[0];
 
     /*
-     * Backends other than vhost-user don't support max queue size.
+     * Backends other than vhost-user or vhost-vdpa don't support max queue
+     * size.
      */
     if (!peer) {
         return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
     }
 
-    if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
+    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;
-    }
-
-    return VIRTQUEUE_MAX_SIZE;
+    };
 }
 
 static int peer_attach(VirtIONet *n, int index)
-- 
MST