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net: bridge: multicast: notify switchdev driver whenever MC processing gets disabled 

Whenever bridge driver hits the max capacity of MDBs, it disables
the MC processing (by setting corresponding bridge option), but never
notifies switchdev about such change (the notifiers are called only upon
explicit setting of this option, through the registered netlink interface).

This could lead to situation when Software MDB processing gets disabled,
but this event never gets offloaded to the underlying Hardware.

Fix this by adding a notify message in such case.

Fixes: 147c1e9b90 ("switchdev: bridge: Offload multicast disabled")
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Link: https://lore.kernel.org/r/20220215165303.31908-1-oleksandr.mazur@plvision.eu
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oleksandr Mazur 2022-02-15 18:53:03 +02:00 committed by Jakub Kicinski
parent 8d2b1a1ec9
commit c832962ac9
1 changed files with 4 additions and 0 deletions
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4
net/bridge/br_multicast.c
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@ -82,6 +82,9 @@ static void br_multicast_find_del_pg(struct net_bridge *br,
struct net_bridge_port_group *pg);
static void __br_multicast_stop(struct net_bridge_mcast *brmctx);
static int br_mc_disabled_update(struct net_device *dev, bool value,
struct netlink_ext_ack *extack);
static struct net_bridge_port_group *
br_sg_port_find(struct net_bridge *br,
struct net_bridge_port_group_sg_key *sg_p)
@ -1156,6 +1159,7 @@ struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
return mp;
if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
br_mc_disabled_update(br->dev, false, NULL);
br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
return ERR_PTR(-E2BIG);
}