On 11/11/2014 12:12 PM, Ben Hutchings wrote:
> This reverts commit 88e0e0e5aa722b193c8758c8b45d041de5316924 for
> the tap drivers, but leaves UFO disabled in virtio_net.
>
> libvirt at least assumes that tap features will never be dropped
> in new kernel versions, and doing so prevents migration of VMs to
> the never kernel version while they are running with virtio net
> devices.
>
> Fixes: 88e0e0e5aa7a ("drivers/net: Disable UFO through virtio")
> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> ---
> Compile-tested only.
I ran some migrations tests of different guests between the hosts
with 3.17 and a newly patched kernel and they all worked for me.
Tested-by: Vladislav Yasevich <vyasevic@xxxxxxxxxx>
-vlad
>
> Ben.
>
> drivers/net/macvtap.c | 13 ++++++++-----
> drivers/net/tun.c | 19 ++++++++-----------
> 2 files changed, 16 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 6f226de..aeaeb6d 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)
>
> @@ -570,8 +570,6 @@ 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))
> ipv6_proxy_select_ident(skb);
> @@ -619,6 +617,8 @@ 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)
> @@ -953,6 +953,9 @@ 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
> @@ -963,7 +966,7 @@ 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;
> @@ -1064,7 +1067,7 @@ 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();
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 7302398..a0987d1 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -175,7 +175,7 @@ struct tun_struct {
> struct net_device *dev;
> netdev_features_t set_features;
> #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
> - NETIF_F_TSO6)
> + NETIF_F_TSO6|NETIF_F_UFO)
>
> int vnet_hdr_sz;
> int sndbuf;
> @@ -1152,20 +1152,10 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
> skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
> break;
> case VIRTIO_NET_HDR_GSO_UDP:
> - {
> - static bool warned;
> -
> - if (!warned) {
> - warned = true;
> - netdev_warn(tun->dev,
> - "%s: using disabled UFO feature; please fix this program\n",
> - current->comm);
> - }
> skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
> if (skb->protocol == htons(ETH_P_IPV6))
> ipv6_proxy_select_ident(skb);
> break;
> - }
> default:
> tun->dev->stats.rx_frame_errors++;
> kfree_skb(skb);
> @@ -1265,6 +1255,8 @@ static ssize_t tun_put_user(struct tun_struct *tun,
> gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
> else if (sinfo->gso_type & SKB_GSO_TCPV6)
> gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
> + else if (sinfo->gso_type & SKB_GSO_UDP)
> + gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;
> else {
> pr_err("unexpected GSO type: "
> "0x%x, gso_size %d, hdr_len %d\n",
> @@ -1774,6 +1766,11 @@ static int set_offload(struct tun_struct *tun, unsigned long arg)
> features |= NETIF_F_TSO6;
> arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
> }
> +
> + if (arg & TUN_F_UFO) {
> + features |= NETIF_F_UFO;
> + arg &= ~TUN_F_UFO;
> + }
> }
>
> /* This gives the user a way to test for new features in future by
>
>
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