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
16struct pse_req_info {
17	struct ethnl_req_info base;
18};
19
20struct 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
30const 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
34static 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
55static 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
74static 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
89static 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
111const 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
118static int
119ethnl_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
124static int
125ethnl_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
150const 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