1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * PHY device list allow maintaining a list of PHY devices that are
4 * part of a netdevice's link topology. PHYs can for example be chained,
5 * as is the case when using a PHY that exposes an SFP module, on which an
6 * SFP transceiver that embeds a PHY is connected.
7 *
8 * This list can then be used by userspace to leverage individual PHY
9 * capabilities.
10 */
11 #ifndef __PHY_LINK_TOPOLOGY_H
12 #define __PHY_LINK_TOPOLOGY_H
13
14 #include <linux/ethtool.h>
15 #include <linux/netdevice.h>
16
17 struct xarray;
18 struct phy_device;
19 struct sfp_bus;
20
21 struct phy_link_topology {
22 struct xarray phys;
23 u32 next_phy_index;
24 };
25
26 struct phy_device_node {
27 enum phy_upstream upstream_type;
28
29 union {
30 struct net_device *netdev;
31 struct phy_device *phydev;
32 } upstream;
33
34 struct sfp_bus *parent_sfp_bus;
35
36 struct phy_device *phy;
37 };
38
39 #if IS_ENABLED(CONFIG_PHYLIB)
40 int phy_link_topo_add_phy(struct net_device *dev,
41 struct phy_device *phy,
42 enum phy_upstream upt, void *upstream);
43
44 void phy_link_topo_del_phy(struct net_device *dev, struct phy_device *phy);
45
46 static inline struct phy_device *
47 phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
48 {
49 struct phy_link_topology *topo = dev->link_topo;
50 struct phy_device_node *pdn;
51
52 if (!topo)
53 return NULL;
54
55 pdn = xa_load(&topo->phys, phyindex);
56 if (pdn)
57 return pdn->phy;
58
59 return NULL;
60 }
61
62 #else
63 static inline int phy_link_topo_add_phy(struct net_device *dev,
64 struct phy_device *phy,
65 enum phy_upstream upt, void *upstream)
66 {
67 return 0;
68 }
69
70 static inline void phy_link_topo_del_phy(struct net_device *dev,
71 struct phy_device *phy)
72 {
73 }
74
75 static inline struct phy_device *
76 phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
77 {
78 return NULL;
79 }
80 #endif
81
82 #endif /* __PHY_LINK_TOPOLOGY_H */
83
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