[PATCH v3 1/4] virtio-net: do not reset vlan filtering at set_features

[Hawkins Jiawei]

This function is called after virtio_load, so all vlan configuration is
lost in migration case.

Just allow all the vlan-tagged packets if vlan is not configured, and
trust device reset to clear all filtered vlans.

Fixes: 0b1eaa8803 ("virtio-net: Do not filter VLANs without F_CTRL_VLAN")
Signed-off-by: Eugenio Pérez <epere...@redhat.com>
Reviewed-by: Hawkins Jiawei <yin31...@gmail.com>
Signed-off-by: Hawkins Jiawei <yin31...@gmail.com>
---
v3:
 - remove the extra "From" line

v2: 
https://lore.kernel.org/all/95af0d013281282f48ad3f47f6ad1ac4ca9e52eb.1690100802.git.yin31...@gmail.com/

 hw/net/virtio-net.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 7102ec4817..d20d5a63cd 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1006,9 +1006,7 @@ static void virtio_net_set_features(VirtIODevice *vdev, 
uint64_t features)
         vhost_net_save_acked_features(nc->peer);
     }
 
-    if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
-        memset(n->vlans, 0, MAX_VLAN >> 3);
-    } else {
+    if (!virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
         memset(n->vlans, 0xff, MAX_VLAN >> 3);
     }
 
-- 
2.25.1