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194 lines · 4.9 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2023 Bootlin
4 *
5 */
6#include <linux/phy.h>
7#include <linux/phy_link_topology.h>
8#include <linux/sfp.h>
9#include <net/netdev_lock.h>
10
11#include "common.h"
12#include "netlink.h"
13
14struct phy_req_info {
15 struct ethnl_req_info base;
16};
17
18struct phy_reply_data {
19 struct ethnl_reply_data base;
20 u32 phyindex;
21 char *drvname;
22 char *name;
23 unsigned int upstream_type;
24 char *upstream_sfp_name;
25 unsigned int upstream_index;
26 char *downstream_sfp_name;
27};
28
29#define PHY_REPDATA(__reply_base) \
30 container_of(__reply_base, struct phy_reply_data, base)
31
32const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1] = {
33 [ETHTOOL_A_PHY_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
34};
35
36static int phy_reply_size(const struct ethnl_req_info *req_info,
37 const struct ethnl_reply_data *reply_data)
38{
39 struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
40 size_t size = 0;
41
42 /* ETHTOOL_A_PHY_INDEX */
43 size += nla_total_size(sizeof(u32));
44
45 /* ETHTOOL_A_DRVNAME */
46 if (rep_data->drvname)
47 size += nla_total_size(strlen(rep_data->drvname) + 1);
48
49 /* ETHTOOL_A_NAME */
50 size += nla_total_size(strlen(rep_data->name) + 1);
51
52 /* ETHTOOL_A_PHY_UPSTREAM_TYPE */
53 size += nla_total_size(sizeof(u32));
54
55 /* ETHTOOL_A_PHY_UPSTREAM_SFP_NAME */
56 if (rep_data->upstream_sfp_name)
57 size += nla_total_size(strlen(rep_data->upstream_sfp_name) + 1);
58
59 /* ETHTOOL_A_PHY_UPSTREAM_INDEX */
60 if (rep_data->upstream_index)
61 size += nla_total_size(sizeof(u32));
62
63 /* ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME */
64 if (rep_data->downstream_sfp_name)
65 size += nla_total_size(strlen(rep_data->downstream_sfp_name) + 1);
66
67 return size;
68}
69
70static int phy_prepare_data(const struct ethnl_req_info *req_info,
71 struct ethnl_reply_data *reply_data,
72 const struct genl_info *info)
73{
74 struct phy_link_topology *topo = reply_data->dev->link_topo;
75 struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
76 struct nlattr **tb = info->attrs;
77 struct phy_device_node *pdn;
78 struct phy_device *phydev;
79 int ret;
80
81 phydev = ethnl_req_get_phydev(req_info, tb, ETHTOOL_A_PHY_HEADER,
82 info->extack);
83 if (IS_ERR_OR_NULL(phydev))
84 return -EOPNOTSUPP;
85
86 pdn = xa_load(&topo->phys, phydev->phyindex);
87 if (!pdn)
88 return -EOPNOTSUPP;
89
90 rep_data->phyindex = phydev->phyindex;
91
92 rep_data->name = kstrdup(dev_name(&phydev->mdio.dev), GFP_KERNEL);
93 if (!rep_data->name)
94 return -ENOMEM;
95
96 if (phydev->drv) {
97 rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);
98 if (!rep_data->drvname) {
99 ret = -ENOMEM;
100 goto err_free_name;
101 }
102 }
103
104 rep_data->upstream_type = pdn->upstream_type;
105
106 if (pdn->upstream_type == PHY_UPSTREAM_PHY) {
107 struct phy_device *upstream = pdn->upstream.phydev;
108 rep_data->upstream_index = upstream->phyindex;
109 }
110
111 if (pdn->parent_sfp_bus) {
112 rep_data->upstream_sfp_name = kstrdup(sfp_get_name(pdn->parent_sfp_bus),
113 GFP_KERNEL);
114 if (!rep_data->upstream_sfp_name) {
115 ret = -ENOMEM;
116 goto err_free_drvname;
117 }
118 }
119
120 if (phydev->sfp_bus) {
121 rep_data->downstream_sfp_name = kstrdup(sfp_get_name(phydev->sfp_bus),
122 GFP_KERNEL);
123 if (!rep_data->downstream_sfp_name) {
124 ret = -ENOMEM;
125 goto err_free_upstream_sfp;
126 }
127 }
128
129 return 0;
130
131err_free_upstream_sfp:
132 kfree(rep_data->upstream_sfp_name);
133err_free_drvname:
134 kfree(rep_data->drvname);
135err_free_name:
136 kfree(rep_data->name);
137 return ret;
138}
139
140static int phy_fill_reply(struct sk_buff *skb,
141 const struct ethnl_req_info *req_info,
142 const struct ethnl_reply_data *reply_data)
143{
144 struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
145
146 if (nla_put_u32(skb, ETHTOOL_A_PHY_INDEX, rep_data->phyindex) ||
147 nla_put_string(skb, ETHTOOL_A_PHY_NAME, rep_data->name) ||
148 nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_TYPE, rep_data->upstream_type))
149 return -EMSGSIZE;
150
151 if (rep_data->drvname &&
152 nla_put_string(skb, ETHTOOL_A_PHY_DRVNAME, rep_data->drvname))
153 return -EMSGSIZE;
154
155 if (rep_data->upstream_index &&
156 nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_INDEX,
157 rep_data->upstream_index))
158 return -EMSGSIZE;
159
160 if (rep_data->upstream_sfp_name &&
161 nla_put_string(skb, ETHTOOL_A_PHY_UPSTREAM_SFP_NAME,
162 rep_data->upstream_sfp_name))
163 return -EMSGSIZE;
164
165 if (rep_data->downstream_sfp_name &&
166 nla_put_string(skb, ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME,
167 rep_data->downstream_sfp_name))
168 return -EMSGSIZE;
169
170 return 0;
171}
172
173static void phy_cleanup_data(struct ethnl_reply_data *reply_data)
174{
175 struct phy_reply_data *rep_data = PHY_REPDATA(reply_data);
176
177 kfree(rep_data->drvname);
178 kfree(rep_data->name);
179 kfree(rep_data->upstream_sfp_name);
180 kfree(rep_data->downstream_sfp_name);
181}
182
183const struct ethnl_request_ops ethnl_phy_request_ops = {
184 .request_cmd = ETHTOOL_MSG_PHY_GET,
185 .reply_cmd = ETHTOOL_MSG_PHY_GET_REPLY,
186 .hdr_attr = ETHTOOL_A_PHY_HEADER,
187 .req_info_size = sizeof(struct phy_req_info),
188 .reply_data_size = sizeof(struct phy_reply_data),
189
190 .prepare_data = phy_prepare_data,
191 .reply_size = phy_reply_size,
192 .fill_reply = phy_fill_reply,
193 .cleanup_data = phy_cleanup_data,
194};