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route: Add multipath_hash in flowi_common to make user-define hash

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Current fib_multipath_hash_policy can make hash based on the L3 or
L4. But it only work on the outer IP. So a specific tunnel always
has the same hash value. But a specific tunnel may contain so many
inner connections.

This patch provide a generic multipath_hash in floi_common. It can
make a user-define hash which can mix with L3 or L4 hash.

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wenxu
2019-02-24 11:36:20 +08:00
committed by David S. Miller
parent 8f4ef499c6
commit 24ba14406c
6 changed files with 13 additions and 6 deletions
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4
net/ipv4/route.c
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@@ -1820,6 +1820,7 @@ out:
int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
const struct sk_buff *skb, struct flow_keys *flkeys)
{
u32 multipath_hash = fl4->flowi4_multipath_hash;
struct flow_keys hash_keys;
u32 mhash;
@@ -1870,6 +1871,9 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
}
mhash = flow_hash_from_keys(&hash_keys);
if (multipath_hash)
mhash = jhash_2words(mhash, multipath_hash, 0);
return mhash >> 1;
}
#endif /* CONFIG_IP_ROUTE_MULTIPATH */