Commit 3b709334 authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

ipv4: Restore fib_trie_flush_external function and fix call ordering 



The patch that removed the FIB offload infrastructure was a bit too
aggressive and also removed code needed to clean up us splitting the table
if additional rules were added.  Specifically the function
fib_trie_flush_external was called at the end of a new rule being added to
flush the foreign trie entries from the main trie.

I updated the code so that we only call fib_trie_flush_external on the main
table so that we flush the entries for local from main.  This way we don't
call it for every rule change which is what was happening previously.

Fixes: 347e3b28 ("switchdev: remove FIB offload infrastructure")
Reported-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f23cc643

include/net/ip_fib.h

+1 −0
Original line number Diff line number Diff line
@@ -243,6 +243,7 @@ int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 
		   struct netlink_callback *cb);

int fib_table_flush(struct net *net, struct fib_table *table);

struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);

void fib_table_flush_external(struct fib_table *table);

void fib_free_table(struct fib_table *tb);



#ifndef CONFIG_IP_MULTIPLE_TABLES

net/ipv4/fib_frontend.c

+15 −5
Original line number Diff line number Diff line
@@ -151,7 +151,7 @@ static void fib_replace_table(struct net *net, struct fib_table *old, 


int fib_unmerge(struct net *net)

{

	struct fib_table *old, *new;

	struct fib_table *old, *new, *main_table;



	/* attempt to fetch local table if it has been allocated */

	old = fib_get_table(net, RT_TABLE_LOCAL);
@@ -162,11 +162,21 @@ int fib_unmerge(struct net *net) 
	if (!new)

		return -ENOMEM;



	/* table is already unmerged */

	if (new == old)

		return 0;



	/* replace merged table with clean table */

	if (new != old) {

	fib_replace_table(net, old, new);

	fib_free_table(old);

	}



	/* attempt to fetch main table if it has been allocated */

	main_table = fib_get_table(net, RT_TABLE_MAIN);

	if (!main_table)

		return 0;



	/* flush local entries from main table */

	fib_table_flush_external(main_table);



	return 0;

}

net/ipv4/fib_trie.c

+65 −0
Original line number Diff line number Diff line
@@ -1760,6 +1760,71 @@ out: 
	return NULL;

}



/* Caller must hold RTNL */

void fib_table_flush_external(struct fib_table *tb)

{

	struct trie *t = (struct trie *)tb->tb_data;

	struct key_vector *pn = t->kv;

	unsigned long cindex = 1;

	struct hlist_node *tmp;

	struct fib_alias *fa;



	/* walk trie in reverse order */

	for (;;) {

		unsigned char slen = 0;

		struct key_vector *n;



		if (!(cindex--)) {

			t_key pkey = pn->key;



			/* cannot resize the trie vector */

			if (IS_TRIE(pn))

				break;



			/* resize completed node */

			pn = resize(t, pn);

			cindex = get_index(pkey, pn);



			continue;

		}



		/* grab the next available node */

		n = get_child(pn, cindex);

		if (!n)

			continue;



		if (IS_TNODE(n)) {

			/* record pn and cindex for leaf walking */

			pn = n;

			cindex = 1ul << n->bits;



			continue;

		}



		hlist_for_each_entry_safe(fa, tmp, &n->leaf, fa_list) {

			/* if alias was cloned to local then we just

			 * need to remove the local copy from main

			 */

			if (tb->tb_id != fa->tb_id) {

				hlist_del_rcu(&fa->fa_list);

				alias_free_mem_rcu(fa);

				continue;

			}



			/* record local slen */

			slen = fa->fa_slen;

		}



		/* update leaf slen */

		n->slen = slen;



		if (hlist_empty(&n->leaf)) {

			put_child_root(pn, n->key, NULL);

			node_free(n);

		}

	}

}



/* Caller must hold RTNL. */

int fib_table_flush(struct net *net, struct fib_table *tb)

{

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