netdev - [PATCH net-next v4 2/6] net: dsa: Add convenience functions for frame handling

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Date:   Tue,  6 Sep 2022 08:34:46 +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 v4 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.

Signed-off-by: Mattias Forsblad <mattias.forsblad@...il.com>
---
 include/net/dsa.h | 13 +++++++++++++
 net/dsa/dsa.c     | 28 ++++++++++++++++++++++++++++
 net/dsa/dsa2.c    |  2 ++
 3 files changed, 43 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index f2ce12860546..70a358641235 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 +1392,17 @@ 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? */
+	if (completion)
+		complete(completion);
+	else
+		complete(&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..2d7add779b6f 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -324,6 +324,34 @@ 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)
+{
+	int ret;
+	struct completion *com;
+
+	/* Custom completion? */
+	if (completion)
+		com = completion;
+	else
+		com = &ds->inband_done;
+
+	reinit_completion(com);
+
+	if (skb)
+		dev_queue_xmit(skb);
+
+	ret = wait_for_completion_timeout(com, msecs_to_jiffies(timeout));
+	if (ret <= 0) {
+		dev_dbg(ds->dev, "DSA inband: timeout waiting for answer\n");
+
+		return -ETIMEDOUT;
+	}
+
+	return ret;
+}
+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..a1b3ecfdffb8 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -1746,6 +1746,8 @@ static int dsa_switch_probe(struct dsa_switch *ds)
 		dsa_tree_put(dst);
 	}
 
+	init_completion(&ds->inband_done);
+
 	return err;
 }
 
-- 
2.25.1