netdev - [PATCH net-next v9 2/6] net: dsa: Add convenience functions for frame handling

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Date:   Mon, 12 Sep 2022 13:28:51 +0200
From:   Mattias Forsblad <mattias.forsblad@...il.com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mattias Forsblad <mattias.forsblad@...il.com>
Subject: [PATCH net-next v9 2/6] net: dsa: Add convenience functions for frame handling

Add common control functions for drivers that need
to send and wait for control frames.

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Mattias Forsblad <mattias.forsblad@...il.com>
---
 include/net/dsa.h | 11 +++++++++++
 net/dsa/dsa.c     | 17 +++++++++++++++++
 net/dsa/dsa2.c    |  2 ++
 3 files changed, 30 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index f2ce12860546..08f3fff5f4df 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -495,6 +495,8 @@ struct dsa_switch {
 	unsigned int		max_num_bridges;
 
 	unsigned int		num_ports;
+
+	struct completion	inband_done;
 };
 
 static inline struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
@@ -1390,6 +1392,15 @@ void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
 void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
 				unsigned int count);
 
+int dsa_switch_inband_tx(struct dsa_switch *ds, struct sk_buff *skb,
+			 struct completion *completion, unsigned long timeout);
+
+static inline void dsa_switch_inband_complete(struct dsa_switch *ds, struct completion *completion)
+{
+	/* Custom completion? */
+	complete(completion ?: &ds->inband_done);
+}
+
 #define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count)	\
 static int __init dsa_tag_driver_module_init(void)			\
 {									\
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index be7b320cda76..ad870494d68b 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -324,6 +324,23 @@ int dsa_switch_resume(struct dsa_switch *ds)
 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 #endif
 
+int dsa_switch_inband_tx(struct dsa_switch *ds, struct sk_buff *skb,
+			 struct completion *completion, unsigned long timeout)
+{
+	struct completion *com;
+
+	/* Custom completion? */
+	com = completion ? : &ds->inband_done;
+
+	reinit_completion(com);
+
+	if (skb)
+		dev_queue_xmit(skb);
+
+	return wait_for_completion_timeout(com, msecs_to_jiffies(timeout));
+}
+EXPORT_SYMBOL_GPL(dsa_switch_inband_tx);
+
 static struct packet_type dsa_pack_type __read_mostly = {
 	.type	= cpu_to_be16(ETH_P_XDSA),
 	.func	= dsa_switch_rcv,
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index ed56c7a554b8..a048a6200789 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -874,6 +874,8 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 	if (ds->setup)
 		return 0;
 
+	init_completion(&ds->inband_done);
+
 	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
 	 * driver and before ops->setup() has run, since the switch drivers and
 	 * the slave MDIO bus driver rely on these values for probing PHY
-- 
2.25.1