Merge branch 'bridge-mcast-preparations-for-evpn-extensions'

Ido Schimmel says:

====================
bridge: mcast: Preparations for EVPN extensions

This patchset was split from [1] and includes non-functional changes
aimed at making it easier to add additional netlink attributes later on.
Future extensions are available here [2].

The idea behind these patches is to create an MDB configuration
structure into which netlink messages are parsed into. The structure is
then passed in the entry creation / deletion call chain instead of
passing the netlink attributes themselves. The same pattern is used by
other rtnetlink objects such as routes and nexthops.

I initially tried to extend the current code, but it proved to be too
difficult, which is why I decided to refactor it to the extensible and
familiar pattern used by other rtnetlink objects.

Tested using existing selftests and using a new selftest that will be
submitted together with the planned extensions.

[1] https://lore.kernel.org/netdev/20221018120420.561846-1-idosch@nvidia.com/
[2] https://github.com/idosch/linux/commits/submit/mdb_v1
====================

Link: https://lore.kernel.org/r/20221206105809.363767-1-idosch@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_multicast.c

@@ -1273,7 +1273,7 @@ br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_i
 
 struct net_bridge_port_group *br_multicast_new_port_group(
 			struct net_bridge_port *port,
-			struct br_ip *group,
+			const struct br_ip *group,
 			struct net_bridge_port_group __rcu *next,
 			unsigned char flags,
 			const unsigned char *src,

net/bridge/br_private.h

@@ -92,6 +92,13 @@ struct bridge_mcast_stats {
 	struct br_mcast_stats mstats;
 	struct u64_stats_sync syncp;
 };
+
+struct br_mdb_config {
+	struct net_bridge		*br;
+	struct net_bridge_port		*p;
+	struct br_mdb_entry		*entry;
+	struct br_ip			group;
+};
 #endif
 
 /* net_bridge_mcast_port must be always defined due to forwarding stubs */
@@ -934,7 +941,8 @@ br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
 struct net_bridge_mdb_entry *
 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
 struct net_bridge_port_group *
-br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
+br_multicast_new_port_group(struct net_bridge_port *port,
+			    const struct br_ip *group,
 			    struct net_bridge_port_group __rcu *next,
 			    unsigned char flags, const unsigned char *src,
 			    u8 filter_mode, u8 rt_protocol);