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ipv6: Use a 31-bit multipath hash

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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 <idosch@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2018-01-09 16:40:26 +02:00 committed by David S. Miller
parent d7dedee184
commit 7696c06a18
1 changed files with 2 additions and 2 deletions
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4
net/ipv6/route.c
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@ -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)