netdev - [PATCH net-next 3/4] net: sfp: add mandatory attach/detach methods for sfp buses

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Message-Id: <E1hSk79-0000w6-9j@rmk-PC.armlinux.org.uk>
Date:   Mon, 20 May 2019 16:22:11 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Vladimir Oltean <olteanv@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org
Subject: [PATCH net-next 3/4] net: sfp: add mandatory attach/detach methods
 for sfp buses

Add attach and detach methods for SFP buses, which will allow us to get
rid of the netdev storage in sfp-bus.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 16 ++++++++++++++++
 drivers/net/phy/sfp-bus.c |  4 ++--
 include/linux/sfp.h       |  6 ++++++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index bdee5f307a7f..7161c0fbb03c 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1595,6 +1595,20 @@ int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
 }
 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
 
+static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
+{
+	struct phylink *pl = upstream;
+
+	pl->netdev->sfp_bus = bus;
+}
+
+static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
+{
+	struct phylink *pl = upstream;
+
+	pl->netdev->sfp_bus = NULL;
+}
+
 static int phylink_sfp_module_insert(void *upstream,
 				     const struct sfp_eeprom_id *id)
 {
@@ -1713,6 +1727,8 @@ static void phylink_sfp_disconnect_phy(void *upstream)
 }
 
 static const struct sfp_upstream_ops sfp_phylink_ops = {
+	.attach = phylink_sfp_attach,
+	.detach = phylink_sfp_detach,
 	.module_insert = phylink_sfp_module_insert,
 	.link_up = phylink_sfp_link_up,
 	.link_down = phylink_sfp_link_down,
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index fef701bfad62..c664c905830a 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -350,7 +350,7 @@ static int sfp_register_bus(struct sfp_bus *bus)
 	bus->socket_ops->attach(bus->sfp);
 	if (bus->started)
 		bus->socket_ops->start(bus->sfp);
-	bus->netdev->sfp_bus = bus;
+	bus->upstream_ops->attach(bus->upstream, bus);
 	bus->registered = true;
 	return 0;
 }
@@ -359,8 +359,8 @@ static void sfp_unregister_bus(struct sfp_bus *bus)
 {
 	const struct sfp_upstream_ops *ops = bus->upstream_ops;
 
-	bus->netdev->sfp_bus = NULL;
 	if (bus->registered) {
+		bus->upstream_ops->detach(bus->upstream, bus);
 		if (bus->started)
 			bus->socket_ops->stop(bus->sfp);
 		bus->socket_ops->detach(bus->sfp);
diff --git a/include/linux/sfp.h b/include/linux/sfp.h
index d9d9de3fcf8e..a3f0336dd703 100644
--- a/include/linux/sfp.h
+++ b/include/linux/sfp.h
@@ -469,6 +469,10 @@ struct sfp_bus;
 
 /**
  * struct sfp_upstream_ops - upstream operations structure
+ * @attach: called when the sfp socket driver is bound to the upstream
+ *   (mandatory).
+ * @detach: called when the sfp socket driver is unbound from the upstream
+ *   (mandatory).
  * @module_insert: called after a module has been detected to determine
  *   whether the module is supported for the upstream device.
  * @module_remove: called after the module has been removed.
@@ -481,6 +485,8 @@ struct sfp_bus;
  *   been removed.
  */
 struct sfp_upstream_ops {
+	void (*attach)(void *priv, struct sfp_bus *bus);
+	void (*detach)(void *priv, struct sfp_bus *bus);
 	int (*module_insert)(void *priv, const struct sfp_eeprom_id *id);
 	void (*module_remove)(void *priv);
 	void (*link_down)(void *priv);
-- 
2.7.4