net: bridge: increase multicast's default maximum number of entries

Nikolay Aleksandrov · davem330 · commit d08c6bc08f72 · 2018-12-05T17:01:51.000-08:00
bridge's default hash_max was 512 which is rather conservative, now that
we're using the generic rhashtable API which autoshrinks let's increase
it to 4096 and move it to a define in br_private.h.

Signed-off-by: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
@@ -1741,7 +1741,7 @@ static void br_ip6_multicast_query_expired(struct timer_list *t)
 
 void br_multicast_init(struct net_bridge *br)
 {
-	br->hash_max = 512;
+	br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
 
 	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 	br->multicast_last_member_count = 2;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
@@ -31,6 +31,8 @@
 #define BR_PORT_BITS	10
 #define BR_MAX_PORTS	(1<<BR_PORT_BITS)
 
+#define BR_MULTICAST_DEFAULT_HASH_MAX 4096
+
 #define BR_VERSION	"2.3"
 
 /* Control of forwarding link local multicast */

Original file line number	Diff line number	Diff line change
`@@ -1741,7 +1741,7 @@ static void br_ip6_multicast_query_expired(struct timer_list *t)`
`1741`	`1741`
`1742`	`1742`	`void br_multicast_init(struct net_bridge *br)`
`1743`	`1743`	`{`
`1744`		`- br->hash_max = 512;`
	`1744`	`+ br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;`
`1745`	`1745`
`1746`	`1746`	`br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;`
`1747`	`1747`	`br->multicast_last_member_count = 2;`