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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2010-06-02 16:24:37 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-05 13:23:16 +0400 |
| commit | b78462ebc6a4ef9074aa80abebcdd470dc5f0ce0 (patch) | |
| tree | fba32dab1e3dca2c5bb5b7d73a64a77c2b6872e8 | |
| parent | 55c95e738da85373965cb03b4f975d0fd559865b (diff) | |
| download | linux-b78462ebc6a4ef9074aa80abebcdd470dc5f0ce0.tar.xz | |
skbuff: add check for non-linear to warn_if_lro and needs_linearize
We can avoid an unecessary cache miss by checking if the skb is non-linear
before accessing gso_size/gso_type in skb_warn_if_lro, the same can also be
done to avoid a cache miss on nr_frags if data_len is 0.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/skbuff.h | 3 | ||||
| -rw-r--r-- | net/core/dev.c | 7 |
2 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index bf243fc54959..645e78d395fd 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2129,7 +2129,8 @@ static inline bool skb_warn_if_lro(const struct sk_buff *skb) /* LRO sets gso_size but not gso_type, whereas if GSO is really * wanted then gso_type will be set. */ struct skb_shared_info *shinfo = skb_shinfo(skb); - if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) { + if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 && + unlikely(shinfo->gso_type == 0)) { __skb_warn_lro_forwarding(skb); return true; } diff --git a/net/core/dev.c b/net/core/dev.c index ec01a5998d70..3abb3a6058be 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2103,9 +2103,10 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, static inline int skb_needs_linearize(struct sk_buff *skb, struct net_device *dev) { - return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) || - (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) || - illegal_highdma(dev, skb))); + return skb_is_nonlinear(skb) && + ((skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) || + (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) || + illegal_highdma(dev, skb)))); } /** |