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authorEric Dumazet <eric.dumazet@gmail.com>2012-02-08 08:51:50 +0000
committerDavid S. Miller <davem@davemloft.net>2012-02-08 15:50:01 -0500
commit43480aecb1f538d4f6dd8b2c5d2b71fb98659072 (patch)
tree11e3720c45cccc5696744c8e0743edd3d53d84c4 /net/core
parent377cb4f9e763465984b9bb5187747fd9b02a14c0 (diff)
gro: more generic L2 header check
Shlomo Pongratz reported GRO L2 header check was suited for Ethernet only, and failed on IB/ipoib traffic. He provided a patch faking a zeroed header to let GRO aggregates frames. Roland Dreier, Herbert Xu, and others suggested we change GRO L2 header check to be more generic, ie not assuming L2 header is 14 bytes, but taking into account hard_header_len. __napi_gro_receive() has special handling for the common case (Ethernet) to avoid a memcmp() call and use an inline optimized function instead. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Reported-by: Shlomo Pongratz <shlomop@mellanox.com> Cc: Roland Dreier <roland@kernel.org> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index f1249472e90..763a0eda715 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3491,14 +3491,20 @@ static inline gro_result_t
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff *p;
+ unsigned int maclen = skb->dev->hard_header_len;
for (p = napi->gro_list; p; p = p->next) {
unsigned long diffs;
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
diffs |= p->vlan_tci ^ skb->vlan_tci;
- diffs |= compare_ether_header(skb_mac_header(p),
- skb_gro_mac_header(skb));
+ if (maclen == ETH_HLEN)
+ diffs |= compare_ether_header(skb_mac_header(p),
+ skb_gro_mac_header(skb));
+ else if (!diffs)
+ diffs = memcmp(skb_mac_header(p),
+ skb_gro_mac_header(skb),
+ maclen);
NAPI_GRO_CB(p)->same_flow = !diffs;
NAPI_GRO_CB(p)->flush = 0;
}