From: Jason Wang Date: Thu, 22 Nov 2018 06:36:30 +0000 (+0800) Subject: virtio-net: disable guest csum during XDP set X-Git-Tag: v4.14.86~89 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e5cfda6c5d04a04e9ec9834925e590f7e921c57f;p=platform%2Fkernel%2Flinux-exynos.git virtio-net: disable guest csum during XDP set [ Upstream commit e59ff2c49ae16e1d179de679aca81405829aee6c ] We don't disable VIRTIO_NET_F_GUEST_CSUM if XDP was set. This means we can receive partial csumed packets with metadata kept in the vnet_hdr. This may have several side effects: - It could be overridden by header adjustment, thus is might be not correct after XDP processing. - There's no way to pass such metadata information through XDP_REDIRECT to another driver. - XDP does not support checksum offload right now. So simply disable guest csum if possible in this the case of XDP. Fixes: 3f93522ffab2d ("virtio-net: switch off offloads on demand if possible on XDP set") Reported-by: Jesper Dangaard Brouer Cc: Jesper Dangaard Brouer Cc: Pavel Popa Cc: David Ahern Signed-off-by: Jason Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index f528e9a..2ffa7b2 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -61,7 +61,8 @@ static const unsigned long guest_offloads[] = { VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, VIRTIO_NET_F_GUEST_ECN, - VIRTIO_NET_F_GUEST_UFO + VIRTIO_NET_F_GUEST_UFO, + VIRTIO_NET_F_GUEST_CSUM }; struct virtnet_stats { @@ -1939,9 +1940,6 @@ static int virtnet_clear_guest_offloads(struct virtnet_info *vi) if (!vi->guest_offloads) return 0; - if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) - offloads = 1ULL << VIRTIO_NET_F_GUEST_CSUM; - return virtnet_set_guest_offloads(vi, offloads); } @@ -1951,8 +1949,6 @@ static int virtnet_restore_guest_offloads(struct virtnet_info *vi) if (!vi->guest_offloads) return 0; - if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) - offloads |= 1ULL << VIRTIO_NET_F_GUEST_CSUM; return virtnet_set_guest_offloads(vi, offloads); }