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net: bridge: mst: Notify switchdev drivers of MST mode changes 

Trigger a switchdev event whenever the bridge's MST mode is
enabled/disabled. This allows constituent ports to either perform any
required hardware config, or refuse the change if it not supported.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tobias Waldekranz 2022-03-16 16:08:46 +01:00 committed by Jakub Kicinski
parent 122c29486e
commit 87c167bb94
2 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/switchdev.h
View File

@ -27,6 +27,7 @@ enum switchdev_attr_id {
SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
SWITCHDEV_ATTR_ID_BRIDGE_MST,
SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
};
@ -48,6 +49,7 @@ struct switchdev_attr {
clock_t ageing_time; /* BRIDGE_AGEING_TIME */
bool vlan_filtering; /* BRIDGE_VLAN_FILTERING */
u16 vlan_protocol; /* BRIDGE_VLAN_PROTOCOL */
bool mst; /* BRIDGE_MST */
bool mc_disabled; /* MC_DISABLED */
u8 mrp_port_role; /* MRP_PORT_ROLE */
} u;

11
net/bridge/br_mst.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/kernel.h>
#include <net/switchdev.h>
#include "br_private.h"
@ -102,8 +103,14 @@ void br_mst_vlan_init_state(struct net_bridge_vlan *v)
int br_mst_set_enabled(struct net_bridge *br, bool on,
struct netlink_ext_ack *extack)
{
struct switchdev_attr attr = {
.id = SWITCHDEV_ATTR_ID_BRIDGE_MST,
.orig_dev = br->dev,
.u.mst = on,
};
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p;
int err;
list_for_each_entry(p, &br->port_list, list) {
vg = nbp_vlan_group(p);
@ -119,6 +126,10 @@ int br_mst_set_enabled(struct net_bridge *br, bool on,
if (br_opt_get(br, BROPT_MST_ENABLED) == on)
return 0;
err = switchdev_port_attr_set(br->dev, &attr, extack);
if (err && err != -EOPNOTSUPP)
return err;
if (on)
static_branch_enable(&br_mst_used);
else