On 16-12-23 06:37 AM, Jason Wang wrote:
> When VIRTIO_NET_F_GUEST_UFO is negotiated, host could still send UFO
> packet that exceeds a single page which could not be handled
> correctly by XDP. So this patch forbids setting XDP when GUEST_UFO is
> supported. While at it, forbid XDP for ECN (which comes only from GRO)
> too to prevent user from misconfiguration.
>
> Cc: John Fastabend <john.r.fastabend@xxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 77ae358..c1f66d8 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1684,7 +1684,9 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog)
> int i, err;
>
> if (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_TSO6) ||
> + virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
> + virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) {
> netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n");
> return -EOPNOTSUPP;
> }
>
Acked-by: John Fastabend <john.r.fastabend@xxxxxxxxx>
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