| Message ID | alpine.DEB.2.00.1108142225120.28244@pokey.mtv.corp.google.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/core/dev.c b/net/core/dev.c index 4bee9a9..a8d91a5 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; }
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> --- net/core/dev.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)