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| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2017-03-16 14:28:00 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-21 23:27:19 +0100 |
| commit | bf4e0a3db97eb882368fd82980b3b1fa0b5b9778 (patch) | |
| tree | f1e5a3fd90d22fc603bc5a6780fc1c716684ad94 /include/net/ip_fib.h | |
| parent | net/8021q: create device with all possible features in wanted_features (diff) | |
| download | linux-bf4e0a3db97eb882368fd82980b3b1fa0b5b9778.tar.xz linux-bf4e0a3db97eb882368fd82980b3b1fa0b5b9778.zip | |
net: ipv4: add support for ECMP hash policy choice
This patch adds support for ECMP hash policy choice via a new sysctl
called fib_multipath_hash_policy and also adds support for L4 hashes.
The current values for fib_multipath_hash_policy are:
0 - layer 3 (default)
1 - layer 4
If there's an skb hash already set and it matches the chosen policy then it
will be used instead of being calculated (currently only for L4).
In L3 mode we always calculate the hash due to the ICMP error special
case, the flow dissector's field consistentification should handle the
address order thus we can remove the address reversals.
If the skb is provided we always use it for the hash calculation,
otherwise we fallback to fl4, that is if skb is NULL fl4 has to be set.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip_fib.h')
| -rw-r--r-- | include/net/ip_fib.h | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index 272e62e139e0..6692c5758b33 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -395,17 +395,13 @@ int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); int fib_sync_down_addr(struct net_device *dev, __be32 local); int fib_sync_up(struct net_device *dev, unsigned int nh_flags); -extern u32 fib_multipath_secret __read_mostly; - -static inline int fib_multipath_hash(__be32 saddr, __be32 daddr) -{ - return jhash_2words((__force u32)saddr, (__force u32)daddr, - fib_multipath_secret) >> 1; -} - +#ifdef CONFIG_IP_ROUTE_MULTIPATH +int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, + const struct sk_buff *skb); +#endif void fib_select_multipath(struct fib_result *res, int hash); void fib_select_path(struct net *net, struct fib_result *res, - struct flowi4 *fl4, int mp_hash); + struct flowi4 *fl4, const struct sk_buff *skb); /* Exported by fib_trie.c */ void fib_trie_init(void); |