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fib_trie: only calc for the un-first node 

This is a enhancement.

for the first node in fib_trie, newpos is 0, bit is 1.
Only for the leaf or node with unmatched key need calc pos.

Signed-off-by: baker.zhang <baker.kernel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
baker.zhang 2013-10-08 11:36:51 +08:00 committed by David S. Miller
parent 5c70ef85a2
commit 4c60f1d67f
1 changed files with 1 additions and 5 deletions
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6
net/ipv4/fib_trie.c
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@ -1117,12 +1117,8 @@ static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen)
* first tnode need some special handling
*/
if (tp)
pos = tp->pos+tp->bits;
else
pos = 0;
if (n) {
pos = tp ? tp->pos+tp->bits : 0;
newpos = tkey_mismatch(key, pos, n->key);
tn = tnode_new(n->key, newpos, 1);
} else {