The following commit has been merged in the batman-adv/next branch: commit b14f243a42c7aa43de71f878641acd003f223022 Author: Pavel Emelyanov xemul@parallels.com Date: Wed Aug 8 21:52:28 2012 +0000
net: Dont use ifindices in hash fns
Eric noticed, that when there will be devices with equal indices, some hash functions that use them will become less effective as they could. Fix this in advance by mixing the net_device address into the hash value instead of the device index.
This is true for arp and ndisc hash fns. The netlabel, can and llc ones are also ifindex-based, but that three are init_net-only, thus will not be affected.
Many thanks to David and Eric for the hash32_ptr implementation!
Signed-off-by: Pavel Emelyanov xemul@parallels.com Signed-off-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/include/linux/hash.h b/include/linux/hash.h index b80506b..24df9e7 100644 --- a/include/linux/hash.h +++ b/include/linux/hash.h @@ -67,4 +67,14 @@ static inline unsigned long hash_ptr(const void *ptr, unsigned int bits) { return hash_long((unsigned long)ptr, bits); } + +static inline u32 hash32_ptr(const void *ptr) +{ + unsigned long val = (unsigned long)ptr; + +#if BITS_PER_LONG == 64 + val ^= (val >> 32); +#endif + return (u32)val; +} #endif /* _LINUX_HASH_H */ diff --git a/include/net/arp.h b/include/net/arp.h index 7f7df93..b630dae 100644 --- a/include/net/arp.h +++ b/include/net/arp.h @@ -3,6 +3,7 @@ #define _ARP_H
#include <linux/if_arp.h> +#include <linux/hash.h> #include <net/neighbour.h>
@@ -10,7 +11,7 @@ extern struct neigh_table arp_tbl;
static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) { - u32 val = key ^ dev->ifindex; + u32 val = key ^ hash32_ptr(dev);
return val * hash_rnd; } diff --git a/include/net/ndisc.h b/include/net/ndisc.h index 96a3b5c..980d263 100644 --- a/include/net/ndisc.h +++ b/include/net/ndisc.h @@ -49,6 +49,7 @@ enum { #include <linux/types.h> #include <linux/if_arp.h> #include <linux/netdevice.h> +#include <linux/hash.h>
#include <net/neighbour.h>
@@ -134,7 +135,7 @@ static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, _ { const u32 *p32 = pkey;
- return (((p32[0] ^ dev->ifindex) * hash_rnd[0]) + + return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + (p32[1] * hash_rnd[1]) + (p32[2] * hash_rnd[2]) + (p32[3] * hash_rnd[3]));