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[IPV4] fib_trie: macro cleanup

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This patch converts the messy macro for MASK_PFX to inline function
and expands TKEY_GET_MASK in the one place it is used.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-08-10 15:22:58 -07:00 committed by David S. Miller
parent 0680191642
commit ab66b4a7a3
1 changed files with 11 additions and 7 deletions
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18
net/ipv4/fib_trie.c
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@ -85,8 +85,6 @@
#define MAX_STAT_DEPTH 32 #define MAX_STAT_DEPTH 32
#define KEYLENGTH (8*sizeof(t_key)) #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; typedef unsigned int t_key;
@ -195,6 +193,11 @@ static inline int tnode_child_length(const struct tnode *tn)
return 1 << tn->bits; 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) static inline t_key tkey_extract_bits(t_key a, int offset, int bits)
{ {
if (offset < KEYLENGTH) if (offset < KEYLENGTH)
@ -679,7 +682,7 @@ static struct tnode *inflate(struct trie *t, struct tnode *tn)
inode->pos == oldtnode->pos + oldtnode->bits && inode->pos == oldtnode->pos + oldtnode->bits &&
inode->bits > 1) { inode->bits > 1) {
struct tnode *left, *right; 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, left = tnode_new(inode->key&(~m), inode->pos + 1,
inode->bits - 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; bits = pn->bits;
if (!chopped_off) 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); 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. * to find a matching prefix.
*/ */
node_prefix = MASK_PFX(cn->key, cn->pos); node_prefix = mask_pfx(cn->key, cn->pos);
key_prefix = MASK_PFX(key, cn->pos); key_prefix = mask_pfx(key, cn->pos);
pref_mismatch = key_prefix^node_prefix; pref_mismatch = key_prefix^node_prefix;
mp = 0; mp = 0;
@ -2330,7 +2334,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
if (IS_TNODE(n)) { if (IS_TNODE(n)) {
struct tnode *tn = (struct 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_indent(seq, iter->depth-1);
seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n",