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net: Get skb hash over flow_keys structure

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This patch changes flow hashing to use jhash2 over the flow_keys
structure instead just doing jhash_3words over src, dst, and ports.
This method will allow us take more input into the hashing function
so that we can include full IPv6 addresses, VLAN, flow labels etc.
without needing to resort to xor'ing which makes for a poor hash.

Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-06-04 09:16:39 -07:00 • committed by David S. Miller
commit 42aecaa9bb
6 changed files with 66 additions and 17 deletions
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2
include/linux/skbuff.h
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@ -1943,7 +1943,7 @@ static inline void skb_probe_transport_header(struct sk_buff *skb,
if (skb_transport_header_was_set(skb))
return;
else if (skb_flow_dissect_flow_keys(skb, &keys))
skb_set_transport_header(skb, keys.basic.thoff);
skb_set_transport_header(skb, keys.control.thoff);
else
skb_set_transport_header(skb, offset_hint);
}