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fib_trie: Fib find node should return parent

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This change makes it so that the parent pointer is returned by reference in
fib_find_node.  By doing this I can use it to find the parent node when I
am performing an insertion and I don't have to look for it again in
fib_insert_node.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2015-03-04 15:01:59 -08:00 committed by David S. Miller
parent 8be33e955c
commit d4a975e83f
1 changed files with 24 additions and 18 deletions
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42
net/ipv4/fib_trie.c
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@ -912,9 +912,9 @@ static void fib_insert_alias(struct tnode *l, struct fib_alias *fa,
}
/* rcu_read_lock needs to be hold by caller from readside */
static struct tnode *fib_find_node(struct trie *t, u32 key)
static struct tnode *fib_find_node(struct trie *t, struct tnode **tn, u32 key)
{
struct tnode *n = rcu_dereference_rtnl(t->trie);
struct tnode *pn = NULL, *n = rcu_dereference_rtnl(t->trie);
while (n) {
unsigned long index = get_index(key, n);
@ -924,21 +924,30 @@ static struct tnode *fib_find_node(struct trie *t, u32 key)
* prefix plus zeros for the bits in the cindex. The index
* is the difference between the key and this value. From
* this we can actually derive several pieces of data.
* if (index & (~0ul << bits))
* if (index >= (1ul << bits))
* we have a mismatch in skip bits and failed
* else
* we know the value is cindex
*
* This check is safe even if bits == KEYLENGTH due to the
* fact that we can only allocate a node with 32 bits if a
* long is greater than 32 bits.
*/
if (index & (~0ul << n->bits))
return NULL;
if (index >= (1ul << n->bits)) {
n = NULL;
break;
}
/* we have found a leaf. Prefixes have already been compared */
if (IS_LEAF(n))
break;
pn = n;
n = tnode_get_child_rcu(n, index);
}
*tn = pn;
return n;
}
@ -1071,15 +1080,15 @@ static struct tnode *fib_insert_node(struct trie *t, u32 key, int plen)
*/
int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
{
struct trie *t = (struct trie *) tb->tb_data;
struct trie *t = (struct trie *)tb->tb_data;
struct fib_alias *fa, *new_fa;
struct tnode *l, *tp;
struct fib_info *fi;
u8 plen = cfg->fc_dst_len;
u8 slen = KEYLENGTH - plen;
u8 tos = cfg->fc_tos;
u32 key, mask;
u32 key;
int err;
struct tnode *l;
if (plen > KEYLENGTH)
return -EINVAL;
@ -1088,9 +1097,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen);
mask = ntohl(inet_make_mask(plen));
if (key & ~mask)
if ((plen < KEYLENGTH) && (key << plen))
return -EINVAL;
fi = fib_create_info(cfg);
@ -1099,7 +1106,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
goto err;
}
l = fib_find_node(t, key);
l = fib_find_node(t, &tp, key);
fa = l ? fib_find_alias(&l->leaf, slen, tos, fi->fib_priority) : NULL;
/* Now fa, if non-NULL, points to the first fib alias
@ -1406,22 +1413,21 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
{
struct trie *t = (struct trie *) tb->tb_data;
struct fib_alias *fa, *fa_to_delete;
struct tnode *l, *tp;
u8 plen = cfg->fc_dst_len;
u8 tos = cfg->fc_tos;
u8 slen = KEYLENGTH - plen;
struct tnode *l;
u32 key, mask;
u8 tos = cfg->fc_tos;
u32 key;
if (plen > KEYLENGTH)
return -EINVAL;
key = ntohl(cfg->fc_dst);
mask = ntohl(inet_make_mask(plen));
if (key & ~mask)
if ((plen < KEYLENGTH) && (key << plen))
return -EINVAL;
l = fib_find_node(t, key);
l = fib_find_node(t, &tp, key);
if (!l)
return -ESRCH;