virtio-net: fail XDP set if guest csum is negotiated

BugLink: https://bugs.launchpad.net/bugs/1836968
[ Upstream commit 18ba58e1c234ea1a2d9835ac8c1735d965ce4640 ]

We don't support partial csumed packet since its metadata will be lost
or incorrect during XDP processing. So fail the XDP set if guest_csum
feature is negotiated.

Fixes: f600b6905015 ("virtio_net: Add XDP support")
Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Pavel Popa <pashinho1990@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 3065d1858658c5bc27152978aa8bbc49afea99ba..f6c83e95ecbfc02a78893014446c57d5a3803f22 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2025,8 +2025,9 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
            && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
                virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
                virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
-               virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO))) {
-               NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first");
+               virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
+               virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
+               NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first");
                return -EOPNOTSUPP;
        }