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| author | Tom Herbert <therbert@google.com> | 2011-08-14 19:46:29 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-08-17 20:06:03 -0700 |
| commit | c6865cb3cc6f3c2857fa4c6f5fda2945d70b1e84 (patch) | |
| tree | 2c575583ebc973f56714d5ab6751b8745972fd6f | |
| parent | e971b7225bcb1f318811ef04628c441497372999 (diff) | |
| download | blackbird-op-linux-c6865cb3cc6f3c2857fa4c6f5fda2945d70b1e84.tar.gz blackbird-op-linux-c6865cb3cc6f3c2857fa4c6f5fda2945d70b1e84.zip | |
rps: Inspect GRE encapsulated packets to get flow hash
Crack open GRE packets in __skb_get_rxhash to compute 4-tuple hash on
in encapsulated packet. Note that this is used only when the
__skb_get_rxhash is taken, in particular only when the device does
not compute provide the rxhash (ie. feature is disabled).
This was tested by creating a single GRE tunnel between two 16 core
AMD machines. 200 netperf TCP_RR streams were ran with 1 byte
request and response size.
Without patch: 157497 tps, 50/90/99% latencies 1250/1292/1364 usecs
With patch: 325896 tps, 50/90/99% latencies 603/848/1169
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/dev.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 4bee9a9aeef6..a8d91a5dd909 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2570,6 +2570,28 @@ again: } switch (ip_proto) { + case IPPROTO_GRE: + if (pskb_may_pull(skb, nhoff + 16)) { + u8 *h = skb->data + nhoff; + __be16 flags = *(__be16 *)h; + + /* + * Only look inside GRE if version zero and no + * routing + */ + if (!(flags & (GRE_VERSION|GRE_ROUTING))) { + proto = *(__be16 *)(h + 2); + nhoff += 4; + if (flags & GRE_CSUM) + nhoff += 4; + if (flags & GRE_KEY) + nhoff += 4; + if (flags & GRE_SEQ) + nhoff += 4; + goto again; + } + } + break; default: break; } |
