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

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Message-Id: <20190521193004.10767-2-vivien.didelot@gmail.com>
Date:   Tue, 21 May 2019 15:29:56 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     netdev@...r.kernel.org
Cc:     cphealy@...il.com, Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>
Subject: [RFC net-next 1/9] net: dsa: introduce dsa_master_find_switch

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.didelot@...il.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