diff options
Diffstat (limited to 'net/ipv4/fib_trie.c')
| -rw-r--r-- | net/ipv4/fib_trie.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index f28f9f5f240..52b2891c63b 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -85,8 +85,6 @@ #define MAX_STAT_DEPTH 32 #define KEYLENGTH (8*sizeof(t_key)) -#define MASK_PFX(k, l) (((l)==0)?0:(k >> (KEYLENGTH-l)) << (KEYLENGTH-l)) -#define TKEY_GET_MASK(offset, bits) (((bits)==0)?0:((t_key)(-1) << (KEYLENGTH - bits) >> offset)) typedef unsigned int t_key; @@ -195,6 +193,11 @@ static inline int tnode_child_length(const struct tnode *tn) return 1 << tn->bits; } +static inline t_key mask_pfx(t_key k, unsigned short l) +{ + return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); +} + static inline t_key tkey_extract_bits(t_key a, int offset, int bits) { if (offset < KEYLENGTH) @@ -679,7 +682,7 @@ static struct tnode *inflate(struct trie *t, struct tnode *tn) inode->pos == oldtnode->pos + oldtnode->bits && inode->bits > 1) { struct tnode *left, *right; - t_key m = TKEY_GET_MASK(inode->pos, 1); + t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; left = tnode_new(inode->key&(~m), inode->pos + 1, inode->bits - 1); @@ -1367,7 +1370,8 @@ fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result bits = pn->bits; if (!chopped_off) - cindex = tkey_extract_bits(MASK_PFX(key, current_prefix_length), pos, bits); + cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), + pos, bits); n = tnode_get_child(pn, cindex); @@ -1453,8 +1457,8 @@ fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result * to find a matching prefix. */ - node_prefix = MASK_PFX(cn->key, cn->pos); - key_prefix = MASK_PFX(key, cn->pos); + node_prefix = mask_pfx(cn->key, cn->pos); + key_prefix = mask_pfx(key, cn->pos); pref_mismatch = key_prefix^node_prefix; mp = 0; @@ -2330,7 +2334,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v) if (IS_TNODE(n)) { struct tnode *tn = (struct tnode *) n; - __be32 prf = htonl(MASK_PFX(tn->key, tn->pos)); + __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); seq_indent(seq, iter->depth-1); seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", |