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Date:   Tue,  8 Sep 2020 02:51:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>, Chris Healy <cphealy@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next v2 1/7] net: dsa: Add helper to convert from devlink to ds

Given a devlink instance, return the dsa switch it is associated to.

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 include/net/dsa.h |  2 ++
 net/dsa/dsa.c     | 20 ++++++++++----------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 75c8fac82017..63ff6f717307 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -629,6 +629,8 @@ struct dsa_switch_ops {
 	int	(*port_max_mtu)(struct dsa_switch *ds, int port);
 };
 
+struct dsa_switch *dsa_devlink_to_ds(struct devlink *dl);
+
 #define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes)		\
 	DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes,		\
 			     dsa_devlink_param_get, dsa_devlink_param_set, NULL)
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 1ce9ba8cf545..86351da4e202 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -327,14 +327,18 @@ int call_dsa_notifiers(unsigned long val, struct net_device *dev,
 }
 EXPORT_SYMBOL_GPL(call_dsa_notifiers);
 
+struct dsa_switch *dsa_devlink_to_ds(struct devlink *dl)
+{
+	struct dsa_devlink_priv *dl_priv = devlink_priv(dl);
+
+	return dl_priv->ds;
+}
+EXPORT_SYMBOL_GPL(dsa_devlink_to_ds);
+
 int dsa_devlink_param_get(struct devlink *dl, u32 id,
 			  struct devlink_param_gset_ctx *ctx)
 {
-	struct dsa_devlink_priv *dl_priv;
-	struct dsa_switch *ds;
-
-	dl_priv = devlink_priv(dl);
-	ds = dl_priv->ds;
+	struct dsa_switch *ds = dsa_devlink_to_ds(dl);
 
 	if (!ds->ops->devlink_param_get)
 		return -EOPNOTSUPP;
@@ -346,11 +350,7 @@ EXPORT_SYMBOL_GPL(dsa_devlink_param_get);
 int dsa_devlink_param_set(struct devlink *dl, u32 id,
 			  struct devlink_param_gset_ctx *ctx)
 {
-	struct dsa_devlink_priv *dl_priv;
-	struct dsa_switch *ds;
-
-	dl_priv = devlink_priv(dl);
-	ds = dl_priv->ds;
+	struct dsa_switch *ds = dsa_devlink_to_ds(dl);
 
 	if (!ds->ops->devlink_param_set)
 		return -EOPNOTSUPP;
-- 
2.28.0

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