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Date: Thu, 18 Dec 2014 00:45:53 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Vladislav Yasevich <vyasevich@...il.com>
Cc: netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
ben@...adent.org.uk, stefanha@...hat.com,
Vladislav Yasevich <vyasevic@...hat.com>
Subject: Re: [PATCH 01/10] core: Split out UFO6 support
On Wed, Dec 17, 2014 at 01:20:46PM -0500, Vladislav Yasevich wrote:
> Split IPv6 support for UFO into its own feature similiar to TSO.
> This will later allow us to re-enable UFO support for virtio-net
> devices.
>
> Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
> ---
> include/linux/netdev_features.h | 7 +++++--
> include/linux/netdevice.h | 1 +
> include/linux/skbuff.h | 1 +
> net/core/dev.c | 35 +++++++++++++++++++----------------
> net/core/ethtool.c | 2 +-
> 5 files changed, 27 insertions(+), 19 deletions(-)
>
> diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
> index dcfdecb..a078945 100644
> --- a/include/linux/netdev_features.h
> +++ b/include/linux/netdev_features.h
> @@ -48,8 +48,9 @@ enum {
> NETIF_F_GSO_UDP_TUNNEL_BIT, /* ... UDP TUNNEL with TSO */
> NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT,/* ... UDP TUNNEL with TSO & CSUM */
> NETIF_F_GSO_MPLS_BIT, /* ... MPLS segmentation */
> + NETIF_F_UFO6_BIT, /* ... UDPv6 fragmentation */
> /**/NETIF_F_GSO_LAST = /* last bit, see GSO_MASK */
> - NETIF_F_GSO_MPLS_BIT,
> + NETIF_F_UFO6_BIT,
>
> NETIF_F_FCOE_CRC_BIT, /* FCoE CRC32 */
> NETIF_F_SCTP_CSUM_BIT, /* SCTP checksum offload */
> @@ -109,6 +110,7 @@ enum {
> #define NETIF_F_TSO_ECN __NETIF_F(TSO_ECN)
> #define NETIF_F_TSO __NETIF_F(TSO)
> #define NETIF_F_UFO __NETIF_F(UFO)
> +#define NETIF_F_UFO6 __NETIF_F(UFO6)
> #define NETIF_F_VLAN_CHALLENGED __NETIF_F(VLAN_CHALLENGED)
> #define NETIF_F_RXFCS __NETIF_F(RXFCS)
> #define NETIF_F_RXALL __NETIF_F(RXALL)
> @@ -141,7 +143,7 @@ enum {
>
> /* List of features with software fallbacks. */
> #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \
> - NETIF_F_TSO6 | NETIF_F_UFO)
> + NETIF_F_TSO6 | NETIF_F_UFO | NETIF_F_UFO6)
>
> #define NETIF_F_GEN_CSUM NETIF_F_HW_CSUM
> #define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
> @@ -149,6 +151,7 @@ enum {
> #define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
>
> #define NETIF_F_ALL_TSO (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN)
> +#define NETIF_F_ALL_UFO (NETIF_F_UFO | NETIF_F_UFO6)
>
> #define NETIF_F_ALL_FCOE (NETIF_F_FCOE_CRC | NETIF_F_FCOE_MTU | \
> NETIF_F_FSO)
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 74fd5d3..86af10a 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -3559,6 +3559,7 @@ static inline bool net_gso_ok(netdev_features_t features, int gso_type)
> /* check flags correspondence */
> BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
> BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
> + BUILD_BUG_ON(SKB_GSO_UDP6 != (NETIF_F_UFO6 >> NETIF_F_GSO_SHIFT));
> BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
> BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
> BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 6c8b6f6..8538b67 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -372,6 +372,7 @@ enum {
>
> SKB_GSO_MPLS = 1 << 12,
>
> + SKB_GSO_UDP6 = 1 << 13
> };
>
> #if BITS_PER_LONG > 32
So this implies anything getting GSO packets e.g.
from userspace now needs to check IP version to
set GSO type correctly.
I think you missed some places that do this, e.g. af_packet
sockets.
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 945bbd0..fa4d2ee 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5929,6 +5929,12 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
> features &= ~NETIF_F_ALL_TSO;
> }
>
> + /* UFO requires that SG is present as well */
> + if ((features & NETIF_F_ALL_UFO) && !(features & NETIF_F_SG)) {
> + netdev_dbg(dev, "Dropping UFO features since no SG feature.\n");
> + features &= ~NETIF_F_ALL_UFO;
> + }
> +
> if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
> !(features & NETIF_F_IP_CSUM)) {
> netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
> @@ -5952,24 +5958,21 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
> features &= ~NETIF_F_GSO;
> }
>
> - /* UFO needs SG and checksumming */
> - if (features & NETIF_F_UFO) {
> - /* maybe split UFO into V4 and V6? */
> - if (!((features & NETIF_F_GEN_CSUM) ||
> - (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
> - == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
> - netdev_dbg(dev,
> - "Dropping NETIF_F_UFO since no checksum offload features.\n");
> - features &= ~NETIF_F_UFO;
> - }
> -
> - if (!(features & NETIF_F_SG)) {
> - netdev_dbg(dev,
> - "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
> - features &= ~NETIF_F_UFO;
> - }
> + /* UFO also needs checksumming */
> + if ((features & NETIF_F_UFO) && !(features & NETIF_F_GEN_CSUM) &&
> + !(features & NETIF_F_IP_CSUM)) {
> + netdev_dbg(dev,
> + "Dropping NETIF_F_UFO since no checksum offload features.\n");
> + features &= ~NETIF_F_UFO;
> + }
> + if ((features & NETIF_F_UFO6) && !(features & NETIF_F_GEN_CSUM) &&
> + !(features & NETIF_F_IPV6_CSUM)) {
> + netdev_dbg(dev,
> + "Dropping NETIF_F_UFO6 since no checksum offload features.\n");
> + features &= ~NETIF_F_UFO6;
> }
>
> +
> #ifdef CONFIG_NET_RX_BUSY_POLL
> if (dev->netdev_ops->ndo_busy_poll)
> features |= NETIF_F_BUSY_POLL;
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index 06dfb29..93eff41 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -223,7 +223,7 @@ static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
> return NETIF_F_ALL_TSO;
> case ETHTOOL_GUFO:
> case ETHTOOL_SUFO:
> - return NETIF_F_UFO;
> + return NETIF_F_ALL_UFO;
> case ETHTOOL_GGSO:
> case ETHTOOL_SGSO:
> return NETIF_F_GSO;
> --
> 1.9.3
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