From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jason Wang , Jesper Dangaard Brouer , Pavel Popa , David Ahern , "David S . Miller" , Sasha Levin , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 32/35] virtio-net: fail XDP set if guest csum is negotiated Date: Thu, 29 Nov 2018 01:01:06 -0500 Message-Id: <20181129060110.159878-32-sashal@kernel.org> In-Reply-To: <20181129060110.159878-1-sashal@kernel.org> References: <20181129060110.159878-1-sashal@kernel.org> List-ID: From: Jason Wang [ 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 Cc: Jesper Dangaard Brouer Cc: Pavel Popa Cc: David Ahern Signed-off-by: Jason Wang Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/virtio_net.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 2ffa7b290591..0e8e3be50332 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1966,8 +1966,9 @@ 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; } -- 2.17.1