net: bridge: mark hash_elasticity as obsolete

Now that the bridge multicast uses the generic rhashtable interface we
can drop the hash_elasticity option as that is already done for us and
it's hardcoded to a maximum of RHT_ELASTICITY (16 currently). Add a
warning about the obsolete option when the hash_elasticity is set.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_multicast.c

@@ -1741,7 +1741,6 @@ static void br_ip6_multicast_query_expired(struct timer_list *t)
 
 void br_multicast_init(struct net_bridge *br)
 {
-	br->hash_elasticity = 4;
 	br->hash_max = 512;
 
 	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;

net/bridge/br_netlink.c

@@ -1189,11 +1189,9 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 			return err;
 	}
 
-	if (data[IFLA_BR_MCAST_HASH_ELASTICITY]) {
-		u32 val = nla_get_u32(data[IFLA_BR_MCAST_HASH_ELASTICITY]);
-
-		br->hash_elasticity = val;
-	}
+	if (data[IFLA_BR_MCAST_HASH_ELASTICITY])
+		br_warn(br, "the hash_elasticity option has been deprecated and is always %u\n",
+			RHT_ELASTICITY);
 
 	if (data[IFLA_BR_MCAST_HASH_MAX])
 		br->hash_max = nla_get_u32(data[IFLA_BR_MCAST_HASH_MAX]);
@@ -1452,8 +1450,7 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 		       br_opt_get(br, BROPT_MULTICAST_QUERIER)) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_STATS_ENABLED,
 		       br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED)) ||
-	    nla_put_u32(skb, IFLA_BR_MCAST_HASH_ELASTICITY,
-			br->hash_elasticity) ||
+	    nla_put_u32(skb, IFLA_BR_MCAST_HASH_ELASTICITY, RHT_ELASTICITY) ||
 	    nla_put_u32(skb, IFLA_BR_MCAST_HASH_MAX, br->hash_max) ||
 	    nla_put_u32(skb, IFLA_BR_MCAST_LAST_MEMBER_CNT,
 			br->multicast_last_member_count) ||

net/bridge/br_private.h

@@ -372,7 +372,6 @@ struct net_bridge {
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 
-	u32				hash_elasticity;
 	u32				hash_max;
 
 	u32				multicast_last_member_count;

net/bridge/br_sysfs_br.c

@@ -424,13 +424,13 @@ static DEVICE_ATTR_RW(multicast_querier);
 static ssize_t hash_elasticity_show(struct device *d,
 				    struct device_attribute *attr, char *buf)
 {
-	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%u\n", br->hash_elasticity);
+	return sprintf(buf, "%u\n", RHT_ELASTICITY);
 }
 
 static int set_elasticity(struct net_bridge *br, unsigned long val)
 {
-	br->hash_elasticity = val;
+	br_warn(br, "the hash_elasticity option has been deprecated and is always %u\n",
+		RHT_ELASTICITY);
 	return 0;
 }