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Commit 3be0686b authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Inline fib_semantic_match into check_leaf 



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

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4c8237cd

net/ipv4/fib_lookup.h

+7 −0
Original line number Diff line number Diff line
@@ -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 */

net/ipv4/fib_semantics.c

+1 −67
Original line number Diff line number Diff line
@@ -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)

net/ipv4/fib_trie.c

+43 −8
Original line number Diff line number Diff line
@@ -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

#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;