Drivers that offload bridges need to iterate over the ports that are
members of a given bridge, for example to rebuild per-port forwarding
bitmaps when membership changes. Currently drivers typically open-code
this by combining dsa_switch_for_each_user_port() with a
dsa_port_offloads_bridge_dev() check, or cache bridge membership
within the driver.

Add dsa_switch_for_each_bridge_member() macro to express this pattern
directly, and use it for the existing dsa_bridge_ports() inline
helper.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
v9: no changes
v8: no changes
v7: reuse existing helper
v6: new patch
---
 include/net/dsa.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index e93b4feaca966..8b6d34e8a6f0d 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -831,15 +831,18 @@ dsa_tree_offloads_bridge_dev(struct dsa_switch_tree *dst,
 	return false;
 }
 
+#define dsa_switch_for_each_bridge_member(_dp, _ds, _bdev) \
+	dsa_switch_for_each_user_port(_dp, _ds) \
+		if (dsa_port_offloads_bridge_dev(_dp, _bdev))
+
 static inline u32
 dsa_bridge_ports(struct dsa_switch *ds, const struct net_device *bdev)
 {
 	struct dsa_port *dp;
 	u32 mask = 0;
 
-	dsa_switch_for_each_user_port(dp, ds)
-		if (dsa_port_offloads_bridge_dev(dp, bdev))
-			mask |= BIT(dp->index);
+	dsa_switch_for_each_bridge_member(dp, ds, bdev)
+		mask |= BIT(dp->index);
 
 	return mask;
 }
-- 
2.53.0