[net-next,2/9] ipv4: Notify route after insertion to the routing table
diff mbox series

Message ID 20191210172402.463397-3-idosch@idosch.org
State Changes Requested
Delegated to: David Miller
Headers show
Series
  • Simplify IPv4 route offload API
Related show

Commit Message

Ido Schimmel Dec. 10, 2019, 5:23 p.m. UTC
From: Ido Schimmel <idosch@mellanox.com>

Currently, a new route is notified in the FIB notification chain before
it is inserted to the FIB alias list.

Subsequent patches will use the placement of the new route in the
ordered FIB alias list in order to determine if the route should be
notified or not.

As a preparatory step, change the order so that the route is first
inserted into the FIB alias list and only then notified.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
---
 net/ipv4/fib_trie.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

Comments

David Ahern Dec. 11, 2019, 5:34 p.m. UTC | #1
On 12/10/19 10:23 AM, Ido Schimmel wrote:
> From: Ido Schimmel <idosch@mellanox.com>
> 
> Currently, a new route is notified in the FIB notification chain before
> it is inserted to the FIB alias list.
> 
> Subsequent patches will use the placement of the new route in the
> ordered FIB alias list in order to determine if the route should be
> notified or not.
> 
> As a preparatory step, change the order so that the route is first
> inserted into the FIB alias list and only then notified.
> 
> Signed-off-by: Ido Schimmel <idosch@mellanox.com>
> ---
>  net/ipv4/fib_trie.c | 29 ++++++++++++++---------------
>  1 file changed, 14 insertions(+), 15 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@gmail.com>

Patch
diff mbox series

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index b9df9c09b84e..9264d6628e9f 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1063,9 +1063,6 @@  static int fib_insert_node(struct trie *t, struct key_vector *tp,
 	return -ENOMEM;
 }
 
-/* fib notifier for ADD is sent before calling fib_insert_alias with
- * the expectation that the only possible failure ENOMEM
- */
 static int fib_insert_alias(struct trie *t, struct key_vector *tp,
 			    struct key_vector *l, struct fib_alias *new,
 			    struct fib_alias *fa, t_key key)
@@ -1118,6 +1115,9 @@  static bool fib_valid_key_len(u32 key, u8 plen, struct netlink_ext_ack *extack)
 	return true;
 }
 
+static void fib_remove_alias(struct trie *t, struct key_vector *tp,
+			     struct key_vector *l, struct fib_alias *old);
+
 /* Caller must hold RTNL. */
 int fib_table_insert(struct net *net, struct fib_table *tb,
 		     struct fib_config *cfg, struct netlink_ext_ack *extack)
@@ -1269,14 +1269,19 @@  int fib_table_insert(struct net *net, struct fib_table *tb,
 	new_fa->tb_id = tb->tb_id;
 	new_fa->fa_default = -1;
 
-	err = call_fib_entry_notifiers(net, event, key, plen, new_fa, extack);
+	/* Insert new entry to the list. */
+	err = fib_insert_alias(t, tp, l, new_fa, fa, key);
 	if (err)
 		goto out_free_new_fa;
 
-	/* Insert new entry to the list. */
-	err = fib_insert_alias(t, tp, l, new_fa, fa, key);
+	/* The alias was already inserted, so the node must exist. */
+	l = l ? l : fib_find_node(t, &tp, key);
+	if (WARN_ON_ONCE(!l))
+		goto out_free_new_fa;
+
+	err = call_fib_entry_notifiers(net, event, key, plen, new_fa, extack);
 	if (err)
-		goto out_fib_notif;
+		goto out_remove_new_fa;
 
 	if (!plen)
 		tb->tb_num_default++;
@@ -1287,14 +1292,8 @@  int fib_table_insert(struct net *net, struct fib_table *tb,
 succeeded:
 	return 0;
 
-out_fib_notif:
-	/* notifier was sent that entry would be added to trie, but
-	 * the add failed and need to recover. Only failure for
-	 * fib_insert_alias is ENOMEM.
-	 */
-	NL_SET_ERR_MSG(extack, "Failed to insert route into trie");
-	call_fib_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, key,
-				 plen, new_fa, NULL);
+out_remove_new_fa:
+	fib_remove_alias(t, tp, l, new_fa);
 out_free_new_fa:
 	kmem_cache_free(fn_alias_kmem, new_fa);
 out: