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ipv4: Inline fib_semantic_match into check_leaf 

This elimiates a lot of pure overhead due to parameter
passing.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-03-07 15:01:10 -08:00
parent 4c8237cd76
commit 3be0686b6e
3 changed files with 51 additions and 75 deletions
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7
net/ipv4/fib_lookup.h
View File

@ -51,4 +51,11 @@ static inline void fib_result_assign(struct fib_result *res,
res->fi = fi;
}
struct fib_prop {
int error;
u8 scope;
};
extern const struct fib_prop fib_props[RTN_MAX + 1];
#endif /* _FIB_LOOKUP_H */

68
net/ipv4/fib_semantics.c
View File

@ -90,11 +90,7 @@ static DEFINE_SPINLOCK(fib_multipath_lock);
#define endfor_nexthops(fi) }
static const struct
{
int error;
u8 scope;
} fib_props[RTN_MAX + 1] = {
const struct fib_prop fib_props[RTN_MAX + 1] = {
[RTN_UNSPEC] = {
.error = 0,
.scope = RT_SCOPE_NOWHERE,
@ -902,68 +898,6 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
return ERR_PTR(err);
}
/* Note! fib_semantic_match intentionally uses RCU list functions. */
int fib_semantic_match(struct fib_table *tb, struct list_head *head,
const struct flowi *flp, struct fib_result *res,
int prefixlen, int fib_flags)
{
struct fib_alias *fa;
int nh_sel = 0;
list_for_each_entry_rcu(fa, head, fa_list) {
int err;
if (fa->fa_tos &&
fa->fa_tos != flp->fl4_tos)
continue;
if (fa->fa_scope < flp->fl4_scope)
continue;
fib_alias_accessed(fa);
err = fib_props[fa->fa_type].error;
if (err == 0) {
struct fib_info *fi = fa->fa_info;
if (fi->fib_flags & RTNH_F_DEAD)
continue;
for_nexthops(fi) {
if (nh->nh_flags & RTNH_F_DEAD)
continue;
if (!flp->oif || flp->oif == nh->nh_oif)
break;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (nhsel < fi->fib_nhs) {
nh_sel = nhsel;
goto out_fill_res;
}
#else
if (nhsel < 1)
goto out_fill_res;
#endif
endfor_nexthops(fi);
continue;
}
return err;
}
return 1;
out_fill_res:
res->prefixlen = prefixlen;
res->nh_sel = nh_sel;
res->type = fa->fa_type;
res->scope = fa->fa_scope;
res->fi = fa->fa_info;
res->table = tb;
res->fa_head = head;
if (!(fib_flags & FIB_LOOKUP_NOREF))
atomic_inc(&res->fi->fib_clntref);
return 0;
}
/* Find appropriate source address to this destination */
__be32 __fib_res_prefsrc(struct fib_result *res)

51
net/ipv4/fib_trie.c
View File

@ -1349,23 +1349,58 @@ static int check_leaf(struct fib_table *tb, struct trie *t, struct leaf *l,
struct hlist_node *node;
hlist_for_each_entry_rcu(li, node, hhead, hlist) {
int err;
struct fib_alias *fa;
int plen = li->plen;
__be32 mask = inet_make_mask(plen);
if (l->key != (key & ntohl(mask)))
continue;
err = fib_semantic_match(tb, &li->falh, flp, res, plen, fib_flags);
list_for_each_entry_rcu(fa, &li->falh, fa_list) {
struct fib_info *fi = fa->fa_info;
int nhsel, err;
if (fa->fa_tos && fa->fa_tos != flp->fl4_tos)
continue;
if (fa->fa_scope < flp->fl4_scope)
continue;
fib_alias_accessed(fa);
err = fib_props[fa->fa_type].error;
if (err) {
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.semantic_match_miss++;
#endif
return 1;
}
if (fi->fib_flags & RTNH_F_DEAD)
continue;
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
const struct fib_nh *nh = &fi->fib_nh[nhsel];
if (nh->nh_flags & RTNH_F_DEAD)
continue;
if (flp->oif && flp->oif != nh->nh_oif)
continue;
#ifdef CONFIG_IP_FIB_TRIE_STATS
if (err <= 0)
t->stats.semantic_match_passed++;
else
t->stats.semantic_match_miss++;
t->stats.semantic_match_passed++;
#endif
res->prefixlen = plen;
res->nh_sel = nhsel;
res->type = fa->fa_type;
res->scope = fa->fa_scope;
res->fi = fi;
res->table = tb;
res->fa_head = &li->falh;
if (!(fib_flags & FIB_LOOKUP_NOREF))
atomic_inc(&res->fi->fib_clntref);
return 0;
}
}
#ifdef CONFIG_IP_FIB_TRIE_STATS
t->stats.semantic_match_miss++;
#endif
if (err <= 0)
return err;
}
return 1;