On Wed, Dec 17, 2014 at 01:20:55PM -0500, Vladislav Yasevich wrote:
> This reverts commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4.
> Now that we've split UFO into v4 and v6 version, we can turn
> back UFO support for ipv4. Full IPv6 support will come later as
> it requires extending vnet header structure.
>
> Any older VM that assumes IPv6 support is included in UFO
> will continue to use UFO and the host will generate fragment
> ids for it, thus preserving connectivity.
>
> Fixes: 88e0e0e5aa7a ("drivers/net: Disable UFO through virtio")
> CC: Ben Hutchings <[email protected]>
> Signed-off-by: Vlad Yasevich <[email protected]>
> ---
> drivers/net/virtio_net.c | 24 ++++++++++--------------
> 1 file changed, 10 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index b0bc8ea..534b633 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -491,17 +491,8 @@ static void receive_buf(struct receive_queue *rq, void
> *buf, unsigned int len)
> skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
> break;
> case VIRTIO_NET_HDR_GSO_UDP:
> - {
> - static bool warned;
> -
> - if (!warned) {
> - warned = true;
> - netdev_warn(dev,
> - "host using disabled UFO feature;
> please fix it\n");
> - }
> skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
> break;
This might not be true: could be a legacy host.
I think we need to check for IPv6 and set it
correctly to SKB_GSO_UDP/SKB_GSO_UDP6?
> - }
> case VIRTIO_NET_HDR_GSO_TCPV6:
> skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
> break;
> @@ -890,6 +881,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff
> *skb)
> hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
> else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
> hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
> + else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
> + hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
> else
> BUG();
> if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
> @@ -1749,7 +1742,7 @@ static int virtnet_probe(struct virtio_device *vdev)
> dev->features |=
> NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
>
> if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
> - dev->hw_features |= NETIF_F_TSO
> + dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
> | NETIF_F_TSO_ECN | NETIF_F_TSO6;
> }
> /* Individual feature bits: what can host handle? */
> @@ -1759,9 +1752,11 @@ static int virtnet_probe(struct virtio_device *vdev)
> dev->hw_features |= NETIF_F_TSO6;
> if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
> dev->hw_features |= NETIF_F_TSO_ECN;
> + if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
> + dev->hw_features |= NETIF_F_UFO;
>
> if (gso)
> - dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
> + dev->features |= dev->hw_features &
> (NETIF_F_ALL_TSO|NETIF_F_UFO);
> /* (!csum && gso) case will be fixed by register_netdev() */
> }
> if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
> @@ -1799,7 +1794,8 @@ static int virtnet_probe(struct virtio_device *vdev)
> /* If we can receive ANY GSO packets, we must allocate large ones. */
> if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
> virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
> - virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
> + virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
> + virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
> vi->big_packets = true;
>
> if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
> @@ -1993,9 +1989,9 @@ static struct virtio_device_id id_table[] = {
> static unsigned int features[] = {
> VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
> VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
> - VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6,
> + VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
> VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
> - VIRTIO_NET_F_GUEST_ECN,
> + VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
> VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
> VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
> VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
> --
> 1.9.3
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