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ipv4: use l4 hash for locally generated multipath flows

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This patch changes how the multipath hash is computed for locally
generated flows: now the hash comprises l4 information.

This allows better utilization of the available paths when the existing
flows have the same source IP and the same destination IP: with l3 hash,
even when multiple connections are in place simultaneously, a single path
will be used, while with l4 hash we can use all the available paths.

v2 changes:
- use get_hash_from_flowi4() instead of implementing just another l4 hash
  function

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2015-10-29 22:20:40 +01:00 committed by David S. Miller
parent 1032a66871
commit 9920e48b83
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/fib_semantics.c
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@ -1564,7 +1564,8 @@ void fib_select_path(struct net *net, struct fib_result *res,
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (res->fi->fib_nhs > 1 && fl4->flowi4_oif == 0) {
if (mp_hash < 0)
mp_hash = fib_multipath_hash(fl4->saddr, fl4->daddr);
mp_hash = get_hash_from_flowi4(fl4) >> 1;
fib_select_multipath(res, mp_hash);
}
else