From 9920e48b830a0f4ec06bcbf0ec3147c88ae72bac Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Thu, 29 Oct 2015 22:20:40 +0100 Subject: [PATCH] ipv4: use l4 hash for locally generated multipath flows 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 Signed-off-by: David S. Miller --- net/ipv4/fib_semantics.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 42778d9d71e5..f30df0ee4f4d 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -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