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net: bridge: BROPT_FDB_LOCAL_VLAN_0: On bridge changeaddr, skip per-VLAN FDBs

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When BROPT_FDB_LOCAL_VLAN_0 is enabled, the local FDB entries for the
bridge itself should not be created per-VLAN, but instead only on VLAN 0.
When the bridge address changes, the local FDB entries need to be updated,
which is done in br_fdb_change_mac_address().

Bail out early when in VLAN-0 mode, so that the per-VLAN FDB entries are
not created. The per-VLAN walk is only done afterwards.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/0bd432cf91921ef7c4ed0e129de1d1cd358c716b.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2025-09-04 19:07:21 +02:00 committed by Jakub Kicinski
parent 4cf5fd8497
commit 40df3b8e90
1 changed files with 4 additions and 1 deletions
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5
net/bridge/br_fdb.c
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@ -503,6 +503,9 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
struct net_bridge_vlan_group *vg;
struct net_bridge_fdb_entry *f;
struct net_bridge_vlan *v;
bool local_vlan_0;
local_vlan_0 = br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0);
spin_lock_bh(&br->hash_lock);
@ -514,7 +517,7 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
fdb_add_local(br, NULL, newaddr, 0);
vg = br_vlan_group(br);
if (!vg || !vg->num_vlans)
if (!vg || !vg->num_vlans || local_vlan_0)
goto out;
/* Now remove and add entries for every VLAN configured on the
* bridge. This function runs under RTNL so the bitmap will not