virtio-net: don't let virtio core to validate used length

For RX virtuqueue, the used length is validated in all the three paths
(big, small and mergeable). For control vq, we never tries to use used
length. So this patch forbids the core to validate the used length.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20211027022107.14357-3-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6d8c874..7c43bfc 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3385,6 +3385,7 @@ static struct virtio_driver virtio_net_driver = {
        .feature_table_size = ARRAY_SIZE(features),
        .feature_table_legacy = features_legacy,
        .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
+       .suppress_used_validation = true,
        .driver.name =  KBUILD_MODNAME,
        .driver.owner = THIS_MODULE,
        .id_table =     id_table,