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ipv4: L3 hash-based multipath

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Replaces the per-packet multipath with a hash-based multipath using
source and destination address.

Signed-off-by: Peter Nørlund <pch@ordbogen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Nørlund
2015-09-30 10:12:21 +02:00
committed by David S. Miller
parent 2472186f58
commit 0e884c78ee
3 changed files with 98 additions and 72 deletions
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14
include/net/ip_fib.h
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@@ -79,7 +79,7 @@ struct fib_nh {
unsigned char nh_scope;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
int nh_weight;
int nh_power;
atomic_t nh_upper_bound;
#endif
#ifdef CONFIG_IP_ROUTE_CLASSID
__u32 nh_tclassid;
@@ -118,7 +118,7 @@ struct fib_info {
#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
int fib_nhs;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
int fib_power;
int fib_weight;
#endif
struct rcu_head rcu;
struct fib_nh fib_nh[0];
@@ -320,7 +320,15 @@ int ip_fib_check_default(__be32 gw, struct net_device *dev);
int fib_sync_down_dev(struct net_device *dev, unsigned long event);
int fib_sync_down_addr(struct net *net, __be32 local);
int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
void fib_select_multipath(struct fib_result *res);
extern u32 fib_multipath_secret __read_mostly;
static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
{
return jhash_2words(saddr, daddr, fib_multipath_secret) >> 1;
}
void fib_select_multipath(struct fib_result *res, int hash);
/* Exported by fib_trie.c */
void fib_trie_init(void);