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rps: Add flag to skb to indicate rxhash is based on L4 tuple

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The l4_rxhash flag was added to the skb structure to indicate
that the rxhash value was computed over the 4 tuple for the
packet which includes the port information in the encapsulated
transport packet.  This is used by the stack to preserve the
rxhash value in __skb_rx_tunnel.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2011-08-14 19:45:55 +00:00
committed by David S. Miller
parent 792df22cd0
commit bdeab99191
9 changed files with 39 additions and 19 deletions
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10
net/core/dev.c
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@@ -2519,10 +2519,11 @@ static inline void ____napi_schedule(struct softnet_data *sd,
/*
* __skb_get_rxhash: calculate a flow hash based on src/dst addresses
* and src/dst port numbers. Returns a non-zero hash number on success
* and 0 on failure.
* and src/dst port numbers. Sets rxhash in skb to non-zero hash value
* on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
* if hash is a canonical 4-tuple hash over transport ports.
*/
__u32 __skb_get_rxhash(struct sk_buff *skb)
void __skb_get_rxhash(struct sk_buff *skb)
{
int nhoff, hash = 0, poff;
const struct ipv6hdr *ip6;
@@ -2574,6 +2575,7 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
ports.v32 = * (__force u32 *) (skb->data + nhoff);
if (ports.v16[1] < ports.v16[0])
swap(ports.v16[0], ports.v16[1]);
skb->l4_rxhash = 1;
}
}
@@ -2586,7 +2588,7 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
hash = 1;
done:
return hash;
skb->rxhash = hash;
}
EXPORT_SYMBOL(__skb_get_rxhash);