Commit 1a239173 authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

ipv4: Drop leaf from suffix pull/push functions 



It wasn't necessary to pass a leaf in when doing the suffix updates so just
drop it.  Instead just pass the suffix and work with that.

Since we dropped the leaf there is no need to include that in the name so
the names are updated to node_push_suffix and node_pull_suffix.

Finally I noticed that the logic for pulling the suffix length back
actually had some issues.  Specifically it would stop prematurely if there
was a longer suffix, but it was not as long as the original suffix.  I
updated the code to address that in node_pull_suffix.

Fixes: 5405afd1 ("fib_trie: Add tracking value for suffix length")
Suggested-by: default avatarRobert Shearman <rshearma@brocade.com>
Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Reviewed-by: default avatarRobert Shearman <rshearma@brocade.com>
Tested-by: default avatarRobert Shearman <rshearma@brocade.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c66ebf2d

net/ipv4/fib_trie.c

+14 −12
Original line number Diff line number Diff line
@@ -930,22 +930,24 @@ static struct key_vector *resize(struct trie *t, struct key_vector *tn) 
	return tp;

}



static void leaf_pull_suffix(struct key_vector *tp, struct key_vector *l)

static void node_pull_suffix(struct key_vector *tn, unsigned char slen)

{

	while ((tp->slen > tp->pos) && (tp->slen > l->slen)) {

		if (update_suffix(tp) > l->slen)

	unsigned char node_slen = tn->slen;



	while ((node_slen > tn->pos) && (node_slen > slen)) {

		slen = update_suffix(tn);

		if (node_slen == slen)

			break;

		tp = node_parent(tp);



		tn = node_parent(tn);

		node_slen = tn->slen;

	}

}



static void leaf_push_suffix(struct key_vector *tn, struct key_vector *l)

static void node_push_suffix(struct key_vector *tn, unsigned char slen)

{

	/* if this is a new leaf then tn will be NULL and we can sort

	 * out parent suffix lengths as a part of trie_rebalance

	 */

	while (tn->slen < l->slen) {

		tn->slen = l->slen;

	while (tn->slen < slen) {

		tn->slen = slen;

		tn = node_parent(tn);

	}

}
@@ -1107,7 +1109,7 @@ static int fib_insert_alias(struct trie *t, struct key_vector *tp, 
	/* if we added to the tail node then we need to update slen */

	if (l->slen < new->fa_slen) {

		l->slen = new->fa_slen;

		leaf_push_suffix(tp, l);

		node_push_suffix(tp, new->fa_slen);

	}



	return 0;
@@ -1511,7 +1513,7 @@ static void fib_remove_alias(struct trie *t, struct key_vector *tp, 


	/* update the trie with the latest suffix length */

	l->slen = fa->fa_slen;

	leaf_pull_suffix(tp, l);

	node_pull_suffix(tp, fa->fa_slen);

}



/* Caller must hold RTNL. */

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