From ec5f061564238892005257c83565a0b58ec79295 Mon Sep 17 00:00:00 2001 From: Pravin B Shelar Date: Thu, 7 Mar 2013 09:28:01 +0000 Subject: [PATCH 1/1] net: Kill link between CSUM and SG features. Earlier SG was unset if CSUM was not available for given device to force skb copy to avoid sending inconsistent csum. Commit c9af6db4c11c (net: Fix possible wrong checksum generation) added explicit flag to force copy to fix this issue. Therefore there is no need to link SG and CSUM, following patch kills this link between there two features. This patch is also required following patch in series. Signed-off-by: Pravin B Shelar Signed-off-by: David S. Miller --- include/linux/netdevice.h | 13 ++++++++ net/core/dev.c | 63 ++++++++++++++++++++------------------- net/core/skbuff.c | 13 ++++++++ net/ipv4/af_inet.c | 3 -- net/ipv6/ip6_offload.c | 3 -- 5 files changed, 59 insertions(+), 36 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 896eb4985f97..e1ebeffa6b35 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2683,6 +2683,19 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features) { return __skb_gso_segment(skb, features, true); } +__be16 skb_network_protocol(struct sk_buff *skb); + +static inline bool can_checksum_protocol(netdev_features_t features, + __be16 protocol) +{ + return ((features & NETIF_F_GEN_CSUM) || + ((features & NETIF_F_V4_CSUM) && + protocol == htons(ETH_P_IP)) || + ((features & NETIF_F_V6_CSUM) && + protocol == htons(ETH_P_IPV6)) || + ((features & NETIF_F_FCOE_CRC) && + protocol == htons(ETH_P_FCOE))); +} #ifdef CONFIG_BUG extern void netdev_rx_csum_fault(struct net_device *dev); diff --git a/net/core/dev.c b/net/core/dev.c index 96103894ad69..bb999931729f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2208,16 +2208,8 @@ out: } EXPORT_SYMBOL(skb_checksum_help); -/** - * skb_mac_gso_segment - mac layer segmentation handler. - * @skb: buffer to segment - * @features: features for the output path (see dev->features) - */ -struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, - netdev_features_t features) +__be16 skb_network_protocol(struct sk_buff *skb) { - struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); - struct packet_offload *ptype; __be16 type = skb->protocol; while (type == htons(ETH_P_8021Q)) { @@ -2225,13 +2217,31 @@ struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, struct vlan_hdr *vh; if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) - return ERR_PTR(-EINVAL); + return 0; vh = (struct vlan_hdr *)(skb->data + vlan_depth); type = vh->h_vlan_encapsulated_proto; vlan_depth += VLAN_HLEN; } + return type; +} + +/** + * skb_mac_gso_segment - mac layer segmentation handler. + * @skb: buffer to segment + * @features: features for the output path (see dev->features) + */ +struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, + netdev_features_t features) +{ + struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); + struct packet_offload *ptype; + __be16 type = skb_network_protocol(skb); + + if (unlikely(!type)) + return ERR_PTR(-EINVAL); + __skb_pull(skb, skb->mac_len); rcu_read_lock(); @@ -2398,24 +2408,12 @@ static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features) return 0; } -static bool can_checksum_protocol(netdev_features_t features, __be16 protocol) -{ - return ((features & NETIF_F_GEN_CSUM) || - ((features & NETIF_F_V4_CSUM) && - protocol == htons(ETH_P_IP)) || - ((features & NETIF_F_V6_CSUM) && - protocol == htons(ETH_P_IPV6)) || - ((features & NETIF_F_FCOE_CRC) && - protocol == htons(ETH_P_FCOE))); -} - static netdev_features_t harmonize_features(struct sk_buff *skb, __be16 protocol, netdev_features_t features) { if (skb->ip_summed != CHECKSUM_NONE && !can_checksum_protocol(features, protocol)) { features &= ~NETIF_F_ALL_CSUM; - features &= ~NETIF_F_SG; } else if (illegal_highdma(skb->dev, skb)) { features &= ~NETIF_F_SG; } @@ -4921,20 +4919,25 @@ static netdev_features_t netdev_fix_features(struct net_device *dev, features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); } - /* Fix illegal SG+CSUM combinations. */ - if ((features & NETIF_F_SG) && - !(features & NETIF_F_ALL_CSUM)) { - netdev_dbg(dev, - "Dropping NETIF_F_SG since no checksum feature.\n"); - features &= ~NETIF_F_SG; - } - /* TSO requires that SG is present as well. */ if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); features &= ~NETIF_F_ALL_TSO; } + 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"); + features &= ~NETIF_F_TSO; + features &= ~NETIF_F_TSO_ECN; + } + + if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && + !(features & NETIF_F_IPV6_CSUM)) { + netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); + features &= ~NETIF_F_TSO6; + } + /* TSO ECN requires that TSO is present as well. */ if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) features &= ~NETIF_F_TSO_ECN; diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 33245ef54c3b..0a48ae20c903 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2741,12 +2741,19 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features) unsigned int tnl_hlen = skb_tnl_header_len(skb); unsigned int headroom; unsigned int len; + __be16 proto; + bool csum; int sg = !!(features & NETIF_F_SG); int nfrags = skb_shinfo(skb)->nr_frags; int err = -ENOMEM; int i = 0; int pos; + proto = skb_network_protocol(skb); + if (unlikely(!proto)) + return ERR_PTR(-EINVAL); + + csum = !!can_checksum_protocol(features, proto); __skb_push(skb, doffset); headroom = skb_headroom(skb); pos = skb_headlen(skb); @@ -2884,6 +2891,12 @@ skip_fraglist: nskb->data_len = len - hsize; nskb->len += nskb->data_len; nskb->truesize += nskb->data_len; + + if (!csum) { + nskb->csum = skb_checksum(nskb, doffset, + nskb->len - doffset, 0); + nskb->ip_summed = CHECKSUM_NONE; + } } while ((offset += len) < skb->len); return segs; diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 68f6a94f7661..dc3f677360a5 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1284,9 +1284,6 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int id; unsigned int offset = 0; - if (!(features & NETIF_F_V4_CSUM)) - features &= ~NETIF_F_SG; - if (unlikely(skb_shinfo(skb)->gso_type & ~(SKB_GSO_TCPV4 | SKB_GSO_UDP | diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index 8234c1dcdf72..7a0d25a5479c 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -92,9 +92,6 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, u8 *prevhdr; int offset = 0; - if (!(features & NETIF_F_V6_CSUM)) - features &= ~NETIF_F_SG; - if (unlikely(skb_shinfo(skb)->gso_type & ~(SKB_GSO_UDP | SKB_GSO_DODGY | -- 2.39.2