1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // ethtool interface for for Ethernet PSE (Power Sourcing Equipment)
4 // and PD (Powered Device)
5 //
6 // Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
7 //
8
9 #include "common.h"
10 #include "linux/pse-pd/pse.h"
11 #include "netlink.h"
12 #include <linux/ethtool_netlink.h>
13 #include <linux/ethtool.h>
14 #include <linux/phy.h>
15
16 struct pse_req_info {
17 struct ethnl_req_info base;
18 };
19
20 struct pse_reply_data {
21 struct ethnl_reply_data base;
22 struct pse_control_status status;
23 };
24
25 #define PSE_REPDATA(__reply_base) \
26 container_of(__reply_base, struct pse_reply_data, base)
27
28 /* PSE_GET */
29
30 const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = {
31 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
32 };
33
pse_get_pse_attributes(struct net_device * dev,struct netlink_ext_ack * extack,struct pse_reply_data * data)34 static int pse_get_pse_attributes(struct net_device *dev,
35 struct netlink_ext_ack *extack,
36 struct pse_reply_data *data)
37 {
38 struct phy_device *phydev = dev->phydev;
39
40 if (!phydev) {
41 NL_SET_ERR_MSG(extack, "No PHY is attached");
42 return -EOPNOTSUPP;
43 }
44
45 if (!phydev->psec) {
46 NL_SET_ERR_MSG(extack, "No PSE is attached");
47 return -EOPNOTSUPP;
48 }
49
50 memset(&data->status, 0, sizeof(data->status));
51
52 return pse_ethtool_get_status(phydev->psec, extack, &data->status);
53 }
54
pse_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,struct genl_info * info)55 static int pse_prepare_data(const struct ethnl_req_info *req_base,
56 struct ethnl_reply_data *reply_base,
57 struct genl_info *info)
58 {
59 struct pse_reply_data *data = PSE_REPDATA(reply_base);
60 struct net_device *dev = reply_base->dev;
61 int ret;
62
63 ret = ethnl_ops_begin(dev);
64 if (ret < 0)
65 return ret;
66
67 ret = pse_get_pse_attributes(dev, info ? info->extack : NULL, data);
68
69 ethnl_ops_complete(dev);
70
71 return ret;
72 }
73
pse_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)74 static int pse_reply_size(const struct ethnl_req_info *req_base,
75 const struct ethnl_reply_data *reply_base)
76 {
77 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
78 const struct pse_control_status *st = &data->status;
79 int len = 0;
80
81 if (st->podl_admin_state > 0)
82 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
83 if (st->podl_pw_status > 0)
84 len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
85
86 return len;
87 }
88
pse_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)89 static int pse_fill_reply(struct sk_buff *skb,
90 const struct ethnl_req_info *req_base,
91 const struct ethnl_reply_data *reply_base)
92 {
93 const struct pse_reply_data *data = PSE_REPDATA(reply_base);
94 const struct pse_control_status *st = &data->status;
95
96 if (st->podl_admin_state > 0 &&
97 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE,
98 st->podl_admin_state))
99 return -EMSGSIZE;
100
101 if (st->podl_pw_status > 0 &&
102 nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS,
103 st->podl_pw_status))
104 return -EMSGSIZE;
105
106 return 0;
107 }
108
109 const struct ethnl_request_ops ethnl_pse_request_ops = {
110 .request_cmd = ETHTOOL_MSG_PSE_GET,
111 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
112 .hdr_attr = ETHTOOL_A_PSE_HEADER,
113 .req_info_size = sizeof(struct pse_req_info),
114 .reply_data_size = sizeof(struct pse_reply_data),
115
116 .prepare_data = pse_prepare_data,
117 .reply_size = pse_reply_size,
118 .fill_reply = pse_fill_reply,
119 };
120
121 /* PSE_SET */
122
123 const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
124 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
125 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
126 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
127 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
128 };
129
pse_set_pse_config(struct net_device * dev,struct netlink_ext_ack * extack,struct nlattr ** tb)130 static int pse_set_pse_config(struct net_device *dev,
131 struct netlink_ext_ack *extack,
132 struct nlattr **tb)
133 {
134 struct phy_device *phydev = dev->phydev;
135 struct pse_control_config config = {};
136
137 /* Optional attribute. Do not return error if not set. */
138 if (!tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL])
139 return 0;
140
141 /* this values are already validated by the ethnl_pse_set_policy */
142 config.admin_cotrol = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
143
144 if (!phydev) {
145 NL_SET_ERR_MSG(extack, "No PHY is attached");
146 return -EOPNOTSUPP;
147 }
148
149 if (!phydev->psec) {
150 NL_SET_ERR_MSG(extack, "No PSE is attached");
151 return -EOPNOTSUPP;
152 }
153
154 return pse_ethtool_set_config(phydev->psec, extack, &config);
155 }
156
ethnl_set_pse(struct sk_buff * skb,struct genl_info * info)157 int ethnl_set_pse(struct sk_buff *skb, struct genl_info *info)
158 {
159 struct ethnl_req_info req_info = {};
160 struct nlattr **tb = info->attrs;
161 struct net_device *dev;
162 int ret;
163
164 ret = ethnl_parse_header_dev_get(&req_info, tb[ETHTOOL_A_PSE_HEADER],
165 genl_info_net(info), info->extack,
166 true);
167 if (ret < 0)
168 return ret;
169
170 dev = req_info.dev;
171
172 rtnl_lock();
173 ret = ethnl_ops_begin(dev);
174 if (ret < 0)
175 goto out_rtnl;
176
177 ret = pse_set_pse_config(dev, info->extack, tb);
178 ethnl_ops_complete(dev);
179 out_rtnl:
180 rtnl_unlock();
181
182 ethnl_parse_header_dev_put(&req_info);
183
184 return ret;
185 }
186