1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include "netlink.h"
4 #include "common.h"
5
6 struct pause_req_info {
7 struct ethnl_req_info base;
8 };
9
10 struct pause_reply_data {
11 struct ethnl_reply_data base;
12 struct ethtool_pauseparam pauseparam;
13 struct ethtool_pause_stats pausestat;
14 };
15
16 #define PAUSE_REPDATA(__reply_base) \
17 container_of(__reply_base, struct pause_reply_data, base)
18
19 const struct nla_policy ethnl_pause_get_policy[] = {
20 [ETHTOOL_A_PAUSE_HEADER] =
21 NLA_POLICY_NESTED(ethnl_header_policy_stats),
22 };
23
pause_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,struct genl_info * info)24 static int pause_prepare_data(const struct ethnl_req_info *req_base,
25 struct ethnl_reply_data *reply_base,
26 struct genl_info *info)
27 {
28 struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
29 struct net_device *dev = reply_base->dev;
30 int ret;
31
32 if (!dev->ethtool_ops->get_pauseparam)
33 return -EOPNOTSUPP;
34
35 ethtool_stats_init((u64 *)&data->pausestat,
36 sizeof(data->pausestat) / 8);
37
38 ret = ethnl_ops_begin(dev);
39 if (ret < 0)
40 return ret;
41 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
42 if (req_base->flags & ETHTOOL_FLAG_STATS &&
43 dev->ethtool_ops->get_pause_stats)
44 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
45 ethnl_ops_complete(dev);
46
47 return 0;
48 }
49
pause_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)50 static int pause_reply_size(const struct ethnl_req_info *req_base,
51 const struct ethnl_reply_data *reply_base)
52 {
53 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */
54 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */
55 nla_total_size(sizeof(u8)); /* _PAUSE_TX */
56
57 if (req_base->flags & ETHTOOL_FLAG_STATS)
58 n += nla_total_size(0) + /* _PAUSE_STATS */
59 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
60 return n;
61 }
62
ethtool_put_stat(struct sk_buff * skb,u64 val,u16 attrtype,u16 padtype)63 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
64 u16 padtype)
65 {
66 if (val == ETHTOOL_STAT_NOT_SET)
67 return 0;
68 if (nla_put_u64_64bit(skb, attrtype, val, padtype))
69 return -EMSGSIZE;
70
71 return 0;
72 }
73
pause_put_stats(struct sk_buff * skb,const struct ethtool_pause_stats * pause_stats)74 static int pause_put_stats(struct sk_buff *skb,
75 const struct ethtool_pause_stats *pause_stats)
76 {
77 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
78 struct nlattr *nest;
79
80 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
81 if (!nest)
82 return -EMSGSIZE;
83
84 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
85 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
86 ethtool_put_stat(skb, pause_stats->rx_pause_frames,
87 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
88 goto err_cancel;
89
90 nla_nest_end(skb, nest);
91 return 0;
92
93 err_cancel:
94 nla_nest_cancel(skb, nest);
95 return -EMSGSIZE;
96 }
97
pause_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)98 static int pause_fill_reply(struct sk_buff *skb,
99 const struct ethnl_req_info *req_base,
100 const struct ethnl_reply_data *reply_base)
101 {
102 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
103 const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
104
105 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
106 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
107 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
108 return -EMSGSIZE;
109
110 if (req_base->flags & ETHTOOL_FLAG_STATS &&
111 pause_put_stats(skb, &data->pausestat))
112 return -EMSGSIZE;
113
114 return 0;
115 }
116
117 const struct ethnl_request_ops ethnl_pause_request_ops = {
118 .request_cmd = ETHTOOL_MSG_PAUSE_GET,
119 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
120 .hdr_attr = ETHTOOL_A_PAUSE_HEADER,
121 .req_info_size = sizeof(struct pause_req_info),
122 .reply_data_size = sizeof(struct pause_reply_data),
123
124 .prepare_data = pause_prepare_data,
125 .reply_size = pause_reply_size,
126 .fill_reply = pause_fill_reply,
127 };
128
129 /* PAUSE_SET */
130
131 const struct nla_policy ethnl_pause_set_policy[] = {
132 [ETHTOOL_A_PAUSE_HEADER] =
133 NLA_POLICY_NESTED(ethnl_header_policy),
134 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
135 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
136 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
137 };
138
ethnl_set_pause(struct sk_buff * skb,struct genl_info * info)139 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
140 {
141 struct ethtool_pauseparam params = {};
142 struct ethnl_req_info req_info = {};
143 struct nlattr **tb = info->attrs;
144 const struct ethtool_ops *ops;
145 struct net_device *dev;
146 bool mod = false;
147 int ret;
148
149 ret = ethnl_parse_header_dev_get(&req_info,
150 tb[ETHTOOL_A_PAUSE_HEADER],
151 genl_info_net(info), info->extack,
152 true);
153 if (ret < 0)
154 return ret;
155 dev = req_info.dev;
156 ops = dev->ethtool_ops;
157 ret = -EOPNOTSUPP;
158 if (!ops->get_pauseparam || !ops->set_pauseparam)
159 goto out_dev;
160
161 rtnl_lock();
162 ret = ethnl_ops_begin(dev);
163 if (ret < 0)
164 goto out_rtnl;
165 ops->get_pauseparam(dev, ¶ms);
166
167 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
168 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
169 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
170 ret = 0;
171 if (!mod)
172 goto out_ops;
173
174 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms);
175 if (ret < 0)
176 goto out_ops;
177 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
178
179 out_ops:
180 ethnl_ops_complete(dev);
181 out_rtnl:
182 rtnl_unlock();
183 out_dev:
184 dev_put(dev);
185 return ret;
186 }
187