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Commit f93eb4ba authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'fib_trie-next' 



Alexander Duyck says:

====================
ipv4/fib_trie: Cleanups to prepare for introduction of key vector

This patch series is meant to mostly just clean up the fib_trie to prepare
it for the introduction of the key_vector.  As such there are a number of
minor clean-ups such as reformatting the tnode to match the format once the
key vector is introduced, some optimizations to drop the need for a leaf
parent pointer, and some changes to remove duplication of effort such as
the 2 look-ups that were essentially being done per node insertion.

v2: Added code to cleanup idx >> n->bits and explain unsigned long logic
    Added code to prevent allocation when tnode size is larger than size_t
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 3a65f63f 1de3d87b

include/net/ip_fib.h

+42 −28
Original line number Diff line number Diff line
@@ -185,6 +185,7 @@ struct fib_table { 
	u32			tb_id;

	int			tb_default;

	int			tb_num_default;

	struct rcu_head		rcu;

	unsigned long		tb_data[0];

};
@@ -206,12 +207,16 @@ void fib_free_table(struct fib_table *tb); 


static inline struct fib_table *fib_get_table(struct net *net, u32 id)

{

	struct hlist_node *tb_hlist;

	struct hlist_head *ptr;



	ptr = id == RT_TABLE_LOCAL ?

		&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :

		&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];

	return hlist_entry(ptr->first, struct fib_table, tb_hlist);



	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));



	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);

}



static inline struct fib_table *fib_new_table(struct net *net, u32 id)
@@ -222,15 +227,19 @@ static inline struct fib_table *fib_new_table(struct net *net, u32 id) 
static inline int fib_lookup(struct net *net, const struct flowi4 *flp,

			     struct fib_result *res)

{

	int err = -ENETUNREACH;

	struct fib_table *tb;

	int err;



	rcu_read_lock();



	if (!fib_table_lookup(fib_get_table(net, RT_TABLE_LOCAL), flp, res,

			      FIB_LOOKUP_NOREF) ||

	    !fib_table_lookup(fib_get_table(net, RT_TABLE_MAIN), flp, res,

			      FIB_LOOKUP_NOREF))

		err = 0;

	for (err = 0; !err; err = -ENETUNREACH) {

		tb = fib_get_table(net, RT_TABLE_LOCAL);

		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))

			break;

		tb = fib_get_table(net, RT_TABLE_MAIN);

		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))

			break;

	}



	rcu_read_unlock();
@@ -249,29 +258,34 @@ int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res); 
static inline int fib_lookup(struct net *net, struct flowi4 *flp,

			     struct fib_result *res)

{

	if (!net->ipv4.fib_has_custom_rules) {

		int err = -ENETUNREACH;

	struct fib_table *tb;

	int err;



	if (net->ipv4.fib_has_custom_rules)

		return __fib_lookup(net, flp, res);



	rcu_read_lock();



	res->tclassid = 0;

		if ((net->ipv4.fib_local &&

		     !fib_table_lookup(net->ipv4.fib_local, flp, res,

				       FIB_LOOKUP_NOREF)) ||

		    (net->ipv4.fib_main &&

		     !fib_table_lookup(net->ipv4.fib_main, flp, res,

				       FIB_LOOKUP_NOREF)) ||

		    (net->ipv4.fib_default &&

		     !fib_table_lookup(net->ipv4.fib_default, flp, res,

				       FIB_LOOKUP_NOREF)))

			err = 0;



	for (err = 0; !err; err = -ENETUNREACH) {

		tb = rcu_dereference_rtnl(net->ipv4.fib_local);

		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))

			break;



		tb = rcu_dereference_rtnl(net->ipv4.fib_main);

		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))

			break;



		tb = rcu_dereference_rtnl(net->ipv4.fib_default);

		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))

			break;

	}



	rcu_read_unlock();



	return err;

}

	return __fib_lookup(net, flp, res);

}



#endif /* CONFIG_IP_MULTIPLE_TABLES */

include/net/netns/ipv4.h

+4 −3
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 


#include <linux/uidgid.h>

#include <net/inet_frag.h>

#include <linux/rcupdate.h>



struct tcpm_hash_bucket;

struct ctl_table_header;
@@ -38,9 +39,9 @@ struct netns_ipv4 { 
#ifdef CONFIG_IP_MULTIPLE_TABLES

	struct fib_rules_ops	*rules_ops;

	bool			fib_has_custom_rules;

	struct fib_table	*fib_local;

	struct fib_table	*fib_main;

	struct fib_table	*fib_default;

	struct fib_table __rcu	*fib_local;

	struct fib_table __rcu	*fib_main;

	struct fib_table __rcu	*fib_default;

#endif

#ifdef CONFIG_IP_ROUTE_CLASSID

	int			fib_num_tclassid_users;

net/ipv4/fib_frontend.c

+37 −15
Original line number Diff line number Diff line
@@ -89,17 +89,14 @@ struct fib_table *fib_new_table(struct net *net, u32 id) 


	switch (id) {

	case RT_TABLE_LOCAL:

		net->ipv4.fib_local = tb;

		rcu_assign_pointer(net->ipv4.fib_local, tb);

		break;



	case RT_TABLE_MAIN:

		net->ipv4.fib_main = tb;

		rcu_assign_pointer(net->ipv4.fib_main, tb);

		break;



	case RT_TABLE_DEFAULT:

		net->ipv4.fib_default = tb;

		rcu_assign_pointer(net->ipv4.fib_default, tb);

		break;



	default:

		break;

	}
@@ -132,13 +129,14 @@ struct fib_table *fib_get_table(struct net *net, u32 id) 
static void fib_flush(struct net *net)

{

	int flushed = 0;

	struct fib_table *tb;

	struct hlist_head *head;

	unsigned int h;



	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {

		head = &net->ipv4.fib_table_hash[h];

		hlist_for_each_entry(tb, head, tb_hlist)

		struct hlist_head *head = &net->ipv4.fib_table_hash[h];

		struct hlist_node *tmp;

		struct fib_table *tb;



		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)

			flushed += fib_table_flush(tb);

	}
@@ -665,10 +663,12 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 
	s_h = cb->args[0];

	s_e = cb->args[1];



	rcu_read_lock();



	for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {

		e = 0;

		head = &net->ipv4.fib_table_hash[h];

		hlist_for_each_entry(tb, head, tb_hlist) {

		hlist_for_each_entry_rcu(tb, head, tb_hlist) {

			if (e < s_e)

				goto next;

			if (dumped)
@@ -682,6 +682,8 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 
		}

	}

out:

	rcu_read_unlock();



	cb->args[1] = e;

	cb->args[0] = h;
@@ -1117,14 +1119,34 @@ static void ip_fib_net_exit(struct net *net) 


	rtnl_lock();

	for (i = 0; i < FIB_TABLE_HASHSZ; i++) {

		struct fib_table *tb;

		struct hlist_head *head;

		struct hlist_head *head = &net->ipv4.fib_table_hash[i];

		struct hlist_node *tmp;

		struct fib_table *tb;



		/* this is done in two passes as flushing the table could

		 * cause it to be reallocated in order to accommodate new

		 * tnodes at the root as the table shrinks.

		 */

		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)

			fib_table_flush(tb);



		head = &net->ipv4.fib_table_hash[i];

		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {

#ifdef CONFIG_IP_MULTIPLE_TABLES

			switch (tb->tb_id) {

			case RT_TABLE_LOCAL:

				RCU_INIT_POINTER(net->ipv4.fib_local, NULL);

				break;

			case RT_TABLE_MAIN:

				RCU_INIT_POINTER(net->ipv4.fib_main, NULL);

				break;

			case RT_TABLE_DEFAULT:

				RCU_INIT_POINTER(net->ipv4.fib_default, NULL);

				break;

			default:

				break;

			}

#endif

			hlist_del(&tb->tb_hlist);

			fib_table_flush(tb);

			fib_free_table(tb);

		}

	}

net/ipv4/fib_trie.c

+350 −322

File changed.

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