netdev - [PATCH net-next v2 03/10] ipv4: Extend FIB alias find function

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Date:   Sat, 14 Dec 2019 17:53:08 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, dsahern@...il.com, roopa@...ulusnetworks.com,
        jiri@...lanox.com, jakub.kicinski@...ronome.com,
        mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next v2 03/10] ipv4: Extend FIB alias find function

From: Ido Schimmel <idosch@...lanox.com>

Extend the function with another argument, 'find_first'. When set, the
function returns the first FIB alias with the matching {prefix, prefix
length, table ID}. The TOS and priority parameters are ignored. Current
callers are converted to pass 'false' in order to maintain existing
behavior.

This will be used by subsequent patches in the series.

v2:
* New patch

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Suggested-by: David Ahern <dsahern@...il.com>
---
 net/ipv4/fib_trie.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 9264d6628e9f..4c22e768a5b5 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -980,9 +980,12 @@ static struct key_vector *fib_find_node(struct trie *t,
 
 /* Return the first fib alias matching TOS with
  * priority less than or equal to PRIO.
+ * If 'find_first' is set, return the first matching
+ * fib alias, regardless of TOS and priority.
  */
 static struct fib_alias *fib_find_alias(struct hlist_head *fah, u8 slen,
-					u8 tos, u32 prio, u32 tb_id)
+					u8 tos, u32 prio, u32 tb_id,
+					bool find_first)
 {
 	struct fib_alias *fa;
 
@@ -998,6 +1001,8 @@ static struct fib_alias *fib_find_alias(struct hlist_head *fah, u8 slen,
 			continue;
 		if (fa->tb_id != tb_id)
 			break;
+		if (find_first)
+			return fa;
 		if (fa->fa_tos > tos)
 			continue;
 		if (fa->fa_info->fib_priority >= prio || fa->fa_tos < tos)
@@ -1149,7 +1154,7 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
 
 	l = fib_find_node(t, &tp, key);
 	fa = l ? fib_find_alias(&l->leaf, slen, tos, fi->fib_priority,
-				tb->tb_id) : NULL;
+				tb->tb_id, false) : NULL;
 
 	/* Now fa, if non-NULL, points to the first fib alias
 	 * with the same keys [prefix,tos,priority], if such key already
@@ -1565,7 +1570,7 @@ int fib_table_delete(struct net *net, struct fib_table *tb,
 	if (!l)
 		return -ESRCH;
 
-	fa = fib_find_alias(&l->leaf, slen, tos, 0, tb->tb_id);
+	fa = fib_find_alias(&l->leaf, slen, tos, 0, tb->tb_id, false);
 	if (!fa)
 		return -ESRCH;
 
-- 
2.23.0