From: Ido Schimmel Date: Tue, 9 Jan 2018 14:40:26 +0000 (+0200) Subject: ipv6: Use a 31-bit multipath hash X-Git-Tag: v4.19~1702^2~197^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7696c06a189c0f1f4d0a7e49e28d10e1050ec529;p=platform%2Fkernel%2Flinux-rpi.git ipv6: Use a 31-bit multipath hash The hash thresholds assigned to IPv6 nexthops are in the range of [-1, 2^31 - 1], where a negative value is assigned to nexthops that should not be considered during multipath selection. Therefore, in a similar fashion to IPv4, we need to use the upper 31-bits of the multipath hash for multipath selection. Signed-off-by: Ido Schimmel Acked-by: David Ahern Signed-off-by: David S. Miller --- diff --git a/net/ipv6/route.c b/net/ipv6/route.c index ced2c9b..09e8e10 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1833,10 +1833,10 @@ u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb) if (skb) { ip6_multipath_l3_keys(skb, &hash_keys); - return flow_hash_from_keys(&hash_keys); + return flow_hash_from_keys(&hash_keys) >> 1; } - return get_hash_from_flowi6(fl6); + return get_hash_from_flowi6(fl6) >> 1; } void ip6_route_input(struct sk_buff *skb)