[PATCH v5 net-next 05/15] net: bridge: mst: Notify switchdev drivers of VLAN MSTI migrations

Tobias Waldekranz
2022-03-16T15:09:40Z

Whenever a VLAN moves to a new MSTI, send a switchdev notification so
that switchdevs can track a bridge's VID to MSTI mappings.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
---
include/net/switchdev.h | 7 ++++++
net/bridge/br_mst.c | 13 +++++++++++
net/bridge/br_switchdev.c | 46 +++++++++++++++++++++++++++++++++++++++
3 files changed, 66 insertions(+)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 85dd004dc9ad..53dfa0f7cf5b 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -29,6 +29,7 @@ enum switchdev_attr_id {
SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
SWITCHDEV_ATTR_ID_BRIDGE_MST,
SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
+ SWITCHDEV_ATTR_ID_VLAN_MSTI,
};

struct switchdev_brport_flags {
@@ -36,6 +37,11 @@ struct switchdev_brport_flags {
unsigned long mask;
};

+struct switchdev_vlan_msti {
+ u16 vid;
+ u16 msti;
+};
+
struct switchdev_attr {
struct net_device *orig_dev;
enum switchdev_attr_id id;
@@ -52,6 +58,7 @@ struct switchdev_attr {
bool mst; /* BRIDGE_MST */
bool mc_disabled; /* MC_DISABLED */
u8 mrp_port_role; /* MRP_PORT_ROLE */
+ struct switchdev_vlan_msti vlan_msti; /* VLAN_MSTI */
} u;
};

diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c
index 43ca6b97c5c3..29266174e6b4 100644
--- a/net/bridge/br_mst.c
+++ b/net/bridge/br_mst.c
@@ -69,13 +69,26 @@ static void br_mst_vlan_sync_state(struct net_bridge_vlan *pv, u16 msti)

int br_mst_vlan_set_msti(struct net_bridge_vlan *mv, u16 msti)
{
+ struct switchdev_attr attr = {
+ .id = SWITCHDEV_ATTR_ID_VLAN_MSTI,
+ .orig_dev = mv->br->dev,
+ .u.vlan_msti = {
+ .vid = mv->vid,
+ .msti = msti,
+ },
+ };
struct net_bridge_vlan_group *vg;
struct net_bridge_vlan *pv;
struct net_bridge_port *p;
+ int err;

if (mv->msti == msti)
return 0;

+ err = switchdev_port_attr_set(mv->br->dev, &attr, NULL);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+
mv->msti = msti;

list_for_each_entry(p, &mv->br->port_list, list) {
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index 6f6a70121a5e..8cc44c367231 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -331,6 +331,46 @@ br_switchdev_fdb_replay(const struct net_device *br_dev, const void *ctx,
return err;
}

+static int br_switchdev_vlan_attr_replay(struct net_device *br_dev,
+ const void *ctx,
+ struct notifier_block *nb,
+ struct netlink_ext_ack *extack)
+{
+ struct switchdev_notifier_port_attr_info attr_info = {
+ .info = {
+ .dev = br_dev,
+ .extack = extack,
+ .ctx = ctx,
+ },
+ };
+ struct net_bridge *br = netdev_priv(br_dev);
+ struct net_bridge_vlan_group *vg;
+ struct switchdev_attr attr;
+ struct net_bridge_vlan *v;
+ int err;
+
+ attr_info.attr = &attr;
+ attr.orig_dev = br_dev;
+
+ vg = br_vlan_group(br);
+
+ list_for_each_entry(v, &vg->vlan_list, vlist) {
+ if (v->msti) {
+ attr.id = SWITCHDEV_ATTR_ID_VLAN_MSTI;
+ attr.u.vlan_msti.vid = v->vid;
+ attr.u.vlan_msti.msti = v->msti;
+
+ err = nb->notifier_call(nb, SWITCHDEV_PORT_ATTR_SET,
+ &attr_info);
+ err = notifier_to_errno(err);
+ if (err)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
static int
br_switchdev_vlan_replay_one(struct notifier_block *nb,
struct net_device *dev,
@@ -425,6 +465,12 @@ static int br_switchdev_vlan_replay(struct net_device *br_dev,
return err;
}

+ if (adding) {
+ err = br_switchdev_vlan_attr_replay(br_dev, ctx, nb, extack);
+ if (err)
+ return err;
+ }
+
return 0;
}

--
2.25.1