[RFC net-next 1/9] net: dsa: introduce dsa_master_find_switch

[Vivien Didelot]

Introduce a DSA helper to find a dsa_switch structure by ID from a
master interface, that will be useful for frames with a switch ID
but no port ID.

Signed-off-by: Vivien Didelot <vivien.dide...@gmail.com>
---
 net/dsa/dsa_priv.h | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 8f1222324646..2a8ee4c6adc5 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -103,18 +103,25 @@ int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr 
*tb[],
 int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp);
 void dsa_master_teardown(struct net_device *dev);
 
-static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
-                                                      int device, int port)
+static inline struct dsa_switch *dsa_master_find_switch(struct net_device *dev,
+                                                       int device)
 {
        struct dsa_port *cpu_dp = dev->dsa_ptr;
        struct dsa_switch_tree *dst = cpu_dp->dst;
-       struct dsa_switch *ds;
-       struct dsa_port *slave_port;
 
        if (device < 0 || device >= DSA_MAX_SWITCHES)
                return NULL;
 
-       ds = dst->ds[device];
+       return dst->ds[device];
+}
+
+static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
+                                                      int device, int port)
+{
+       struct dsa_port *slave_port;
+       struct dsa_switch *ds;
+
+       ds = dsa_master_find_switch(dev, device);
        if (!ds)
                return NULL;
 
-- 
2.21.0