1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // ethtool interface 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,const 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 const 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->extack, 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 /* PSE_SET */
110
111 const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
112 [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
113 [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
114 NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
115 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
116 };
117
118 static int
ethnl_set_pse_validate(struct ethnl_req_info * req_info,struct genl_info * info)119 ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
120 {
121 return !!info->attrs[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL];
122 }
123
124 static int
ethnl_set_pse(struct ethnl_req_info * req_info,struct genl_info * info)125 ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
126 {
127 struct net_device *dev = req_info->dev;
128 struct pse_control_config config = {};
129 struct nlattr **tb = info->attrs;
130 struct phy_device *phydev;
131
132 /* this values are already validated by the ethnl_pse_set_policy */
133 config.admin_cotrol = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
134
135 phydev = dev->phydev;
136 if (!phydev) {
137 NL_SET_ERR_MSG(info->extack, "No PHY is attached");
138 return -EOPNOTSUPP;
139 }
140
141 if (!phydev->psec) {
142 NL_SET_ERR_MSG(info->extack, "No PSE is attached");
143 return -EOPNOTSUPP;
144 }
145
146 /* Return errno directly - PSE has no notification */
147 return pse_ethtool_set_config(phydev->psec, info->extack, &config);
148 }
149
150 const struct ethnl_request_ops ethnl_pse_request_ops = {
151 .request_cmd = ETHTOOL_MSG_PSE_GET,
152 .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY,
153 .hdr_attr = ETHTOOL_A_PSE_HEADER,
154 .req_info_size = sizeof(struct pse_req_info),
155 .reply_data_size = sizeof(struct pse_reply_data),
156
157 .prepare_data = pse_prepare_data,
158 .reply_size = pse_reply_size,
159 .fill_reply = pse_fill_reply,
160
161 .set_validate = ethnl_set_pse_validate,
162 .set = ethnl_set_pse,
163 /* PSE has no notification */
164 };
165