On Wed, Dec 17, 2014 at 01:20:54PM -0500, Vladislav Yasevich wrote:
> Now that UFO is split into v4 and v6 parts, we can bring
> back v4 support. Continue to handle legacy applications
> by selecting the ipv6 fagment id but do not change the
> gso type. This allows 2 legacy VMs to continue to communicate.
>
> Based on original work from Ben Hutchings.
>
> Fixes: 88e0e0e5aa7a ("drivers/net: Disable UFO through virtio")
> CC: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> Signed-off-by: Vladislav Yasevich <vyasevic@xxxxxxxxxx>
> ---
> drivers/net/macvtap.c | 20 ++++++++++++++------
> 1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 880cc09..75febd4 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -66,7 +66,7 @@ static struct cdev macvtap_cdev;
> static const struct proto_ops macvtap_socket_ops;
>
> #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
> - NETIF_F_TSO6)
> + NETIF_F_TSO6 | NETIF_F_UFO)
> #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
> #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
>
> @@ -570,11 +570,14 @@ static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb,
> gso_type = SKB_GSO_TCPV6;
> break;
> case VIRTIO_NET_HDR_GSO_UDP:
> - pr_warn_once("macvtap: %s: using disabled UFO feature; please fix this program\n",
> - current->comm);
> gso_type = SKB_GSO_UDP;
> - if (skb->protocol == htons(ETH_P_IPV6))
> + if (vlan_get_protocol(skb) == htons(ETH_P_IPV6)) {
> + /* This is to support legacy appliacations.
> + * Do not change the gso_type as legacy apps
> + * may not know about the new type.
> + */
> ipv6_proxy_select_ident(skb);
> + }
> break;
> default:
> return -EINVAL;
> @@ -619,6 +622,8 @@ static void macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
> vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
> else if (sinfo->gso_type & SKB_GSO_TCPV6)
> vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
> + else if (sinfo->gso_type & SKB_GSO_UDP)
> + vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
> else
> BUG();
> if (sinfo->gso_type & SKB_GSO_TCP_ECN)
> @@ -955,6 +960,9 @@ static int set_offload(struct macvtap_queue *q, unsigned long arg)
> if (arg & TUN_F_TSO6)
> feature_mask |= NETIF_F_TSO6;
> }
> +
> + if (arg & TUN_F_UFO)
> + feature_mask |= NETIF_F_UFO;
> }
>
> /* tun/tap driver inverts the usage for TSO offloads, where
> @@ -965,7 +973,7 @@ static int set_offload(struct macvtap_queue *q, unsigned long arg)
> * When user space turns off TSO, we turn off GSO/LRO so that
> * user-space will not receive TSO frames.
> */
> - if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6))
> + if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
> features |= RX_OFFLOADS;
> else
> features &= ~RX_OFFLOADS;
By the way this logic is completely broken, even without your patch,
isn't it?
It says: enable LRO+GRO if any of NETIF_F_TSO | NETIF_F_TSO6 |
NETIF_F_UFO set.
So what happens if I enable TSO only?
LRO gets enabled so I can still get TSO6 packets.
This really should be:
if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO) ==
(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO)
fixing this probably should be a separate patch before your
series, and Cc stable.
> @@ -1066,7 +1074,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
> case TUNSETOFFLOAD:
> /* let the user check for future flags */
> if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
> - TUN_F_TSO_ECN))
> + TUN_F_TSO_ECN | TUN_F_UFO))
> return -EINVAL;
>
> rtnl_lock();
> --
> 1.9.3
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