diff options
| -rw-r--r-- | lib/hash.h | 34 | ||||
| -rw-r--r-- | nest/rt-attr.c | 19 |
2 files changed, 44 insertions, 9 deletions
@@ -178,16 +178,36 @@ #define HASH_WALK_FILTER_END } while (0) -static inline uint -mem_hash(void *p, int s) +typedef mem_hash_t u64; + +static inline void +mem_hash_init(mem_hash_t *h) +{ + *h = 0x001047d54778bcafULL; +} + +static inline void +mem_hash_mix(mem_hash_t *h, void *p, int s) { - const char *pp = p; const u64 multiplier = 0xb38bc09a61202731ULL; - u64 value = 0x001047d54778bcafULL; - int i; - for (i=0;i<s;i++) - value = value*multiplier + pp[i]; + const char *pp = p; + uint i; + for (i=0; i<s; i++) + *h = *h * multiplier + pp[i]; +} +static inline uint +mem_hash_value(mem_hash_t *h) +{ return ((value >> 32) ^ (value & 0xffffffff)); } +static inline uint +mem_hash(void *p, int s) +{ + static mem_hash_t h; + mem_hash_init(&h); + mem_hash_mix(&h, p, s); + return mem_hash_value(&h); +} + diff --git a/nest/rt-attr.c b/nest/rt-attr.c index fb958f7e..edd9ebf5 100644 --- a/nest/rt-attr.c +++ b/nest/rt-attr.c @@ -946,8 +946,23 @@ rta_alloc_hash(void) static inline uint rta_hash(rta *a) { - return mem_hash(((void *)a) + offsetof(rta, src), sizeof(rta) - offsetof(rta, src)) ^ - mpnh_hash(a->nexthops) ^ ea_hash(a->eattrs); + mem_hash_t h; + mem_hash_init(&h); +#define MIX(f) mem_hash_mix(&h, &(rta->f), sizeof(rta->f)); + MIX(src); + MIX(hostentry); + MIX(iface); + MIX(gw); + MIX(from); + MIX(igp_metric); + MIX(source); + MIX(scope); + MIX(cast); + MIX(dest); + MIX(flags); + MIX(aflags); + + return mem_hash_value(&h) ^ mpnh_hash(a->nexthops) ^ ea_hash(a->eattrs); } static inline int |