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batman-adv: Use common Jenkins Hash implementation

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An unoptimized version of the Jenkins one-at-a-time hash function is used
and partially copied all over the code wherever an hashtable is used.
Instead the optimized version shared between the whole kernel should be
used to reduce code duplication and use better optimized code.

Only the DAT code must use the old implementation because it is used as
distributed hash function which has to be common for all nodes.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Sven Eckelmann
2015-03-01 09:46:18 +01:00
committed by Antonio Quartulli
parent d691f9e8d4
commit 36fd61cb80
7 changed files with 25 additions and 62 deletions
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17
net/batman-adv/distributed-arp-table.c
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@@ -206,9 +206,22 @@ static uint32_t batadv_hash_dat(const void *data, uint32_t size)
{
uint32_t hash = 0;
const struct batadv_dat_entry *dat = data;
const unsigned char *key;
uint32_t i;
hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip));
hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid));
key = (const unsigned char *)&dat->ip;
for (i = 0; i < sizeof(dat->ip); i++) {
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
key = (const unsigned char *)&dat->vid;
for (i = 0; i < sizeof(dat->vid); i++) {
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);