In order to allow netlink access to phy_ports, let's add a helper to
retrieve them. When handling a port coming from phy_link_topology, the
caller must hold rtnl until it's done with it.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 include/linux/phy_link_topology.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/phy_link_topology.h b/include/linux/phy_link_topology.h
index 66bceff72b19..d5f8f20c5d32 100644
--- a/include/linux/phy_link_topology.h
+++ b/include/linux/phy_link_topology.h
@@ -66,6 +66,17 @@ phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
 	return NULL;
 }
 
+static inline struct phy_port *
+phy_link_topo_get_port(struct net_device *dev, u32 port_id)
+{
+	struct phy_link_topology *topo = dev->link_topo;
+
+	if (!topo)
+		return NULL;
+
+	return xa_load(&topo->ports, port_id);
+}
+
 #else
 static inline int phy_link_topo_add_phy(struct net_device *dev,
 					struct phy_device *phy,
@@ -95,6 +106,11 @@ phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
 {
 	return NULL;
 }
+
+phy_link_topo_get_port(struct net_device *dev, u32 port_id)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __PHY_LINK_TOPOLOGY_H */
-- 
2.49.0