xref: /openbmc/linux/net/ethtool/linkstate.c (revision c4f7ac64)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include "netlink.h"
4 #include "common.h"
5 #include <linux/phy.h>
6 
7 struct linkstate_req_info {
8 	struct ethnl_req_info		base;
9 };
10 
11 struct linkstate_reply_data {
12 	struct ethnl_reply_data			base;
13 	int					link;
14 	int					sqi;
15 	int					sqi_max;
16 	bool					link_ext_state_provided;
17 	struct ethtool_link_ext_state_info	ethtool_link_ext_state_info;
18 };
19 
20 #define LINKSTATE_REPDATA(__reply_base) \
21 	container_of(__reply_base, struct linkstate_reply_data, base)
22 
23 const struct nla_policy ethnl_linkstate_get_policy[] = {
24 	[ETHTOOL_A_LINKSTATE_HEADER]		=
25 		NLA_POLICY_NESTED(ethnl_header_policy),
26 };
27 
28 static int linkstate_get_sqi(struct net_device *dev)
29 {
30 	struct phy_device *phydev = dev->phydev;
31 	int ret;
32 
33 	if (!phydev)
34 		return -EOPNOTSUPP;
35 
36 	mutex_lock(&phydev->lock);
37 	if (!phydev->drv || !phydev->drv->get_sqi)
38 		ret = -EOPNOTSUPP;
39 	else
40 		ret = phydev->drv->get_sqi(phydev);
41 	mutex_unlock(&phydev->lock);
42 
43 	return ret;
44 }
45 
46 static int linkstate_get_sqi_max(struct net_device *dev)
47 {
48 	struct phy_device *phydev = dev->phydev;
49 	int ret;
50 
51 	if (!phydev)
52 		return -EOPNOTSUPP;
53 
54 	mutex_lock(&phydev->lock);
55 	if (!phydev->drv || !phydev->drv->get_sqi_max)
56 		ret = -EOPNOTSUPP;
57 	else
58 		ret = phydev->drv->get_sqi_max(phydev);
59 	mutex_unlock(&phydev->lock);
60 
61 	return ret;
62 };
63 
64 static int linkstate_get_link_ext_state(struct net_device *dev,
65 					struct linkstate_reply_data *data)
66 {
67 	int err;
68 
69 	if (!dev->ethtool_ops->get_link_ext_state)
70 		return -EOPNOTSUPP;
71 
72 	err = dev->ethtool_ops->get_link_ext_state(dev, &data->ethtool_link_ext_state_info);
73 	if (err)
74 		return err;
75 
76 	data->link_ext_state_provided = true;
77 
78 	return 0;
79 }
80 
81 static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
82 				  struct ethnl_reply_data *reply_base,
83 				  struct genl_info *info)
84 {
85 	struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
86 	struct net_device *dev = reply_base->dev;
87 	int ret;
88 
89 	ret = ethnl_ops_begin(dev);
90 	if (ret < 0)
91 		return ret;
92 	data->link = __ethtool_get_link(dev);
93 
94 	ret = linkstate_get_sqi(dev);
95 	if (ret < 0 && ret != -EOPNOTSUPP)
96 		goto out;
97 	data->sqi = ret;
98 
99 	ret = linkstate_get_sqi_max(dev);
100 	if (ret < 0 && ret != -EOPNOTSUPP)
101 		goto out;
102 	data->sqi_max = ret;
103 
104 	if (dev->flags & IFF_UP) {
105 		ret = linkstate_get_link_ext_state(dev, data);
106 		if (ret < 0 && ret != -EOPNOTSUPP && ret != -ENODATA)
107 			goto out;
108 	}
109 
110 	ret = 0;
111 out:
112 	ethnl_ops_complete(dev);
113 	return ret;
114 }
115 
116 static int linkstate_reply_size(const struct ethnl_req_info *req_base,
117 				const struct ethnl_reply_data *reply_base)
118 {
119 	struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
120 	int len;
121 
122 	len = nla_total_size(sizeof(u8)) /* LINKSTATE_LINK */
123 		+ 0;
124 
125 	if (data->sqi != -EOPNOTSUPP)
126 		len += nla_total_size(sizeof(u32));
127 
128 	if (data->sqi_max != -EOPNOTSUPP)
129 		len += nla_total_size(sizeof(u32));
130 
131 	if (data->link_ext_state_provided)
132 		len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_STATE */
133 
134 	if (data->ethtool_link_ext_state_info.__link_ext_substate)
135 		len += nla_total_size(sizeof(u8)); /* LINKSTATE_EXT_SUBSTATE */
136 
137 	return len;
138 }
139 
140 static int linkstate_fill_reply(struct sk_buff *skb,
141 				const struct ethnl_req_info *req_base,
142 				const struct ethnl_reply_data *reply_base)
143 {
144 	struct linkstate_reply_data *data = LINKSTATE_REPDATA(reply_base);
145 
146 	if (data->link >= 0 &&
147 	    nla_put_u8(skb, ETHTOOL_A_LINKSTATE_LINK, !!data->link))
148 		return -EMSGSIZE;
149 
150 	if (data->sqi != -EOPNOTSUPP &&
151 	    nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI, data->sqi))
152 		return -EMSGSIZE;
153 
154 	if (data->sqi_max != -EOPNOTSUPP &&
155 	    nla_put_u32(skb, ETHTOOL_A_LINKSTATE_SQI_MAX, data->sqi_max))
156 		return -EMSGSIZE;
157 
158 	if (data->link_ext_state_provided) {
159 		if (nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_STATE,
160 			       data->ethtool_link_ext_state_info.link_ext_state))
161 			return -EMSGSIZE;
162 
163 		if (data->ethtool_link_ext_state_info.__link_ext_substate &&
164 		    nla_put_u8(skb, ETHTOOL_A_LINKSTATE_EXT_SUBSTATE,
165 			       data->ethtool_link_ext_state_info.__link_ext_substate))
166 			return -EMSGSIZE;
167 	}
168 
169 	return 0;
170 }
171 
172 const struct ethnl_request_ops ethnl_linkstate_request_ops = {
173 	.request_cmd		= ETHTOOL_MSG_LINKSTATE_GET,
174 	.reply_cmd		= ETHTOOL_MSG_LINKSTATE_GET_REPLY,
175 	.hdr_attr		= ETHTOOL_A_LINKSTATE_HEADER,
176 	.req_info_size		= sizeof(struct linkstate_req_info),
177 	.reply_data_size	= sizeof(struct linkstate_reply_data),
178 
179 	.prepare_data		= linkstate_prepare_data,
180 	.reply_size		= linkstate_reply_size,
181 	.fill_reply		= linkstate_fill_reply,
182 };
183