netdev - [PATCH net-next mlxsw v2 04/16] net: bridge: Add br_multicast_del_port

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Message-ID: <29092300b63495d45cdee68f3c59f5477ca6be12.1675271084.git.petrm@nvidia.com>
Date:   Wed, 1 Feb 2023 18:28:37 +0100
From:   Petr Machata <petrm@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        <netdev@...r.kernel.org>
CC:     <bridge@...ts.linux-foundation.org>,
        Petr Machata <petrm@...dia.com>,
        "Ido Schimmel" <idosch@...dia.com>
Subject: [PATCH net-next mlxsw v2 04/16] net: bridge: Add br_multicast_del_port_group()

Since cleaning up the effects of br_multicast_new_port_group() just
consists of delisting and freeing the memory, the function
br_mdb_add_group_star_g() inlines the corresponding code. In the following
patches, number of per-port and per-port-VLAN MDB entries is going to be
maintained, and that counter will have to be updated. Because that logic
is going to be hidden in the br_multicast module, introduce a new hook
intended to again remove a newly-created group.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>
---
 net/bridge/br_mdb.c       |  3 +--
 net/bridge/br_multicast.c | 11 +++++++++++
 net/bridge/br_private.h   |  1 +
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 139de8ac532c..9f22ebfdc518 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -1099,8 +1099,7 @@ static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg,
 	return 0;
 
 err_del_port_group:
-	hlist_del_init(&p->mglist);
-	kfree(p);
+	br_multicast_del_port_group(p);
 	return err;
 }
 
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index f9f4d54226fd..08da724ebfdd 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1326,6 +1326,17 @@ struct net_bridge_port_group *br_multicast_new_port_group(
 	return p;
 }
 
+void br_multicast_del_port_group(struct net_bridge_port_group *p)
+{
+	struct net_bridge_port *port = p->key.port;
+
+	hlist_del_init(&p->mglist);
+	if (!br_multicast_is_star_g(&p->key.addr))
+		rhashtable_remove_fast(&port->br->sg_port_tbl, &p->rhnode,
+				       br_sg_port_rht_params);
+	kfree(p);
+}
+
 void br_multicast_host_join(const struct net_bridge_mcast *brmctx,
 			    struct net_bridge_mdb_entry *mp, bool notify)
 {
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1805c468ae03..e4069e27b5c6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -958,6 +958,7 @@ br_multicast_new_port_group(struct net_bridge_port *port,
 			    unsigned char flags, const unsigned char *src,
 			    u8 filter_mode, u8 rt_protocol,
 			    struct netlink_ext_ack *extack);
+void br_multicast_del_port_group(struct net_bridge_port_group *p);
 int br_mdb_hash_init(struct net_bridge *br);
 void br_mdb_hash_fini(struct net_bridge *br);
 void br_mdb_notify(struct net_device *dev, struct net_bridge_mdb_entry *mp,
-- 
2.39.0