[PATCH net-next 1/2] net: phy: phy_link_topology: Pass netdevice to phy_link_topo helpers

[Maxime Chevallier]

The phy link topology's main goal is to better track which PHYs are
connected to a given netdevice. Make so that the helpers take the
netdevice as a parameter directly.

Signed-off-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
Fixes: 6916e461e793 ("net: phy: Introduce ethernet link topology representation")
Closes: https://lore.kernel.org/netdev/2e11b89d-100f-49e7-9c9a-834cc0b82f97@xxxxxxxxx/
Closes: https://lore.kernel.org/netdev/20240409201553.GA4124869@dev-arch.thelio-3990X/
---
 drivers/net/phy/phy_device.c        | 25 ++++++++-----------------
 drivers/net/phy/phy_link_topology.c | 13 ++++++++++---
 include/linux/phy_link_topology.h   | 21 +++++++++++++--------
 net/ethtool/netlink.c               |  2 +-
 4 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 616bd7ba46cb..111434201545 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -277,14 +277,6 @@ static void phy_mdio_device_remove(struct mdio_device *mdiodev)
 
 static struct phy_driver genphy_driver;
 
-static struct phy_link_topology *phy_get_link_topology(struct phy_device *phydev)
-{
-	if (phydev->attached_dev)
-		return phydev->attached_dev->link_topo;
-
-	return NULL;
-}
-
 static LIST_HEAD(phy_fixup_list);
 static DEFINE_MUTEX(phy_fixup_lock);
 
@@ -1389,10 +1381,10 @@ static DEVICE_ATTR_RO(phy_standalone);
 int phy_sfp_connect_phy(void *upstream, struct phy_device *phy)
 {
 	struct phy_device *phydev = upstream;
-	struct phy_link_topology *topo = phy_get_link_topology(phydev);
+	struct net_device *dev = phydev->attached_dev;
 
-	if (topo)
-		return phy_link_topo_add_phy(topo, phy, PHY_UPSTREAM_PHY, phydev);
+	if (dev)
+		return phy_link_topo_add_phy(dev, phy, PHY_UPSTREAM_PHY, phydev);
 
 	return 0;
 }
@@ -1411,10 +1403,10 @@ EXPORT_SYMBOL(phy_sfp_connect_phy);
 void phy_sfp_disconnect_phy(void *upstream, struct phy_device *phy)
 {
 	struct phy_device *phydev = upstream;
-	struct phy_link_topology *topo = phy_get_link_topology(phydev);
+	struct net_device *dev = phydev->attached_dev;
 
-	if (topo)
-		phy_link_topo_del_phy(topo, phy);
+	if (dev)
+		phy_link_topo_del_phy(dev, phy);
 }
 EXPORT_SYMBOL(phy_sfp_disconnect_phy);
 
@@ -1561,8 +1553,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 		if (phydev->sfp_bus_attached)
 			dev->sfp_bus = phydev->sfp_bus;
 
-		err = phy_link_topo_add_phy(dev->link_topo, phydev,
-					    PHY_UPSTREAM_MAC, dev);
+		err = phy_link_topo_add_phy(dev, phydev, PHY_UPSTREAM_MAC, dev);
 		if (err)
 			goto error;
 	}
@@ -1992,7 +1983,7 @@ void phy_detach(struct phy_device *phydev)
 	if (dev) {
 		phydev->attached_dev->phydev = NULL;
 		phydev->attached_dev = NULL;
-		phy_link_topo_del_phy(dev->link_topo, phydev);
+		phy_link_topo_del_phy(dev, phydev);
 	}
 	phydev->phylink = NULL;
 
diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
index 985941c5c558..0e36bd7c15dc 100644
--- a/drivers/net/phy/phy_link_topology.c
+++ b/drivers/net/phy/phy_link_topology.c
@@ -35,10 +35,11 @@ void phy_link_topo_destroy(struct phy_link_topology *topo)
 	kfree(topo);
 }
 
-int phy_link_topo_add_phy(struct phy_link_topology *topo,
+int phy_link_topo_add_phy(struct net_device *dev,
 			  struct phy_device *phy,
 			  enum phy_upstream upt, void *upstream)
 {
+	struct phy_link_topology *topo = dev->link_topo;
 	struct phy_device_node *pdn;
 	int ret;
 
@@ -90,10 +91,16 @@ int phy_link_topo_add_phy(struct phy_link_topology *topo,
 }
 EXPORT_SYMBOL_GPL(phy_link_topo_add_phy);
 
-void phy_link_topo_del_phy(struct phy_link_topology *topo,
+void phy_link_topo_del_phy(struct net_device *dev,
 			   struct phy_device *phy)
 {
-	struct phy_device_node *pdn = xa_erase(&topo->phys, phy->phyindex);
+	struct phy_link_topology *topo = dev->link_topo;
+	struct phy_device_node *pdn;
+
+	if (!topo)
+		return;
+
+	pdn = xa_erase(&topo->phys, phy->phyindex);
 
 	/* We delete the PHY from the topology, however we don't re-set the
 	 * phy->phyindex field. If the PHY isn't gone, we can re-assign it the
diff --git a/include/linux/phy_link_topology.h b/include/linux/phy_link_topology.h
index 6b79feb607e7..166a01710aa2 100644
--- a/include/linux/phy_link_topology.h
+++ b/include/linux/phy_link_topology.h
@@ -12,11 +12,11 @@
 #define __PHY_LINK_TOPOLOGY_H
 
 #include <linux/ethtool.h>
+#include <linux/netdevice.h>
 #include <linux/phy_link_topology_core.h>
 
 struct xarray;
 struct phy_device;
-struct net_device;
 struct sfp_bus;
 
 struct phy_device_node {
@@ -37,11 +37,16 @@ struct phy_link_topology {
 	u32 next_phy_index;
 };
 
-static inline struct phy_device *
-phy_link_topo_get_phy(struct phy_link_topology *topo, u32 phyindex)
+static inline struct phy_device
+*phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
 {
-	struct phy_device_node *pdn = xa_load(&topo->phys, phyindex);
+	struct phy_link_topology *topo = dev->link_topo;
+	struct phy_device_node *pdn;
 
+	if (!topo)
+		return NULL;
+
+	pdn = xa_load(&topo->phys, phyindex);
 	if (pdn)
 		return pdn->phy;
 
@@ -49,21 +54,21 @@ phy_link_topo_get_phy(struct phy_link_topology *topo, u32 phyindex)
 }
 
 #if IS_REACHABLE(CONFIG_PHYLIB)
-int phy_link_topo_add_phy(struct phy_link_topology *topo,
+int phy_link_topo_add_phy(struct net_device *dev,
 			  struct phy_device *phy,
 			  enum phy_upstream upt, void *upstream);
 
-void phy_link_topo_del_phy(struct phy_link_topology *lt, struct phy_device *phy);
+void phy_link_topo_del_phy(struct net_device *dev, struct phy_device *phy);
 
 #else
-static inline int phy_link_topo_add_phy(struct phy_link_topology *topo,
+static inline int phy_link_topo_add_phy(struct net_device *dev,
 					struct phy_device *phy,
 					enum phy_upstream upt, void *upstream)
 {
 	return 0;
 }
 
-static inline void phy_link_topo_del_phy(struct phy_link_topology *topo,
+static inline void phy_link_topo_del_phy(struct net_device *dev,
 					 struct phy_device *phy)
 {
 }
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 563e94e0cbd8..f5b4adf324bc 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -170,7 +170,7 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
 			struct nlattr *phy_id;
 
 			phy_id = tb[ETHTOOL_A_HEADER_PHY_INDEX];
-			phydev = phy_link_topo_get_phy(dev->link_topo,
+			phydev = phy_link_topo_get_phy(dev,
 						       nla_get_u32(phy_id));
 			if (!phydev) {
 				NL_SET_BAD_ATTR(extack, phy_id);
-- 
2.44.0