[PATCH v5 net-next 08/15] net: bridge: mst: Add helper to check if MST is enabled

Tobias Waldekranz
2022-03-16T15:10:00Z

This is useful for switchdev drivers that might want to refuse to join
a bridge where MST is enabled, if the hardware can't support it.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
---
include/linux/if_bridge.h | 6 ++++++
net/bridge/br_mst.c | 9 +++++++++
2 files changed, 15 insertions(+)

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index 1cf0cc46d90d..4efd5540279a 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -119,6 +119,7 @@ int br_vlan_get_info(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo);
int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo);
+bool br_mst_enabled(const struct net_device *dev);
int br_mst_get_info(const struct net_device *dev, u16 msti, unsigned long *vids);
#else
static inline bool br_vlan_enabled(const struct net_device *dev)
@@ -153,6 +154,11 @@ static inline int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
return -EINVAL;
}

+static inline bool br_mst_enabled(const struct net_device *dev)
+{
+ return false;
+}
+
static inline int br_mst_get_info(const struct net_device *dev, u16 msti,
unsigned long *vids)
{
diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c
index 00b36e629224..830a5746479f 100644
--- a/net/bridge/br_mst.c
+++ b/net/bridge/br_mst.c
@@ -13,6 +13,15 @@

DEFINE_STATIC_KEY_FALSE(br_mst_used);

+bool br_mst_enabled(const struct net_device *dev)
+{
+ if (!netif_is_bridge_master(dev))
+ return false;
+
+ return br_opt_get(netdev_priv(dev), BROPT_MST_ENABLED);
+}
+EXPORT_SYMBOL_GPL(br_mst_enabled);
+
int br_mst_get_info(const struct net_device *dev, u16 msti, unsigned long *vids)
{
const struct net_bridge_vlan_group *vg;
--
2.25.1