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
ethtool_stats_init(u64 * stats,unsigned int n)24 static void ethtool_stats_init(u64 *stats, unsigned int n)
25 {
26 while (n--)
27 stats[n] = ETHTOOL_STAT_NOT_SET;
28 }
29
pause_prepare_data(const struct ethnl_req_info * req_base,struct ethnl_reply_data * reply_base,struct genl_info * info)30 static int pause_prepare_data(const struct ethnl_req_info *req_base,
31 struct ethnl_reply_data *reply_base,
32 struct genl_info *info)
33 {
34 struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
35 struct net_device *dev = reply_base->dev;
36 int ret;
37
38 if (!dev->ethtool_ops->get_pauseparam)
39 return -EOPNOTSUPP;
40
41 ethtool_stats_init((u64 *)&data->pausestat,
42 sizeof(data->pausestat) / 8);
43
44 ret = ethnl_ops_begin(dev);
45 if (ret < 0)
46 return ret;
47 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
48 if (req_base->flags & ETHTOOL_FLAG_STATS &&
49 dev->ethtool_ops->get_pause_stats)
50 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
51 ethnl_ops_complete(dev);
52
53 return 0;
54 }
55
pause_reply_size(const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)56 static int pause_reply_size(const struct ethnl_req_info *req_base,
57 const struct ethnl_reply_data *reply_base)
58 {
59 int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */
60 nla_total_size(sizeof(u8)) + /* _PAUSE_RX */
61 nla_total_size(sizeof(u8)); /* _PAUSE_TX */
62
63 if (req_base->flags & ETHTOOL_FLAG_STATS)
64 n += nla_total_size(0) + /* _PAUSE_STATS */
65 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
66 return n;
67 }
68
ethtool_put_stat(struct sk_buff * skb,u64 val,u16 attrtype,u16 padtype)69 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
70 u16 padtype)
71 {
72 if (val == ETHTOOL_STAT_NOT_SET)
73 return 0;
74 if (nla_put_u64_64bit(skb, attrtype, val, padtype))
75 return -EMSGSIZE;
76
77 return 0;
78 }
79
pause_put_stats(struct sk_buff * skb,const struct ethtool_pause_stats * pause_stats)80 static int pause_put_stats(struct sk_buff *skb,
81 const struct ethtool_pause_stats *pause_stats)
82 {
83 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
84 struct nlattr *nest;
85
86 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
87 if (!nest)
88 return -EMSGSIZE;
89
90 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
91 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
92 ethtool_put_stat(skb, pause_stats->rx_pause_frames,
93 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
94 goto err_cancel;
95
96 nla_nest_end(skb, nest);
97 return 0;
98
99 err_cancel:
100 nla_nest_cancel(skb, nest);
101 return -EMSGSIZE;
102 }
103
pause_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)104 static int pause_fill_reply(struct sk_buff *skb,
105 const struct ethnl_req_info *req_base,
106 const struct ethnl_reply_data *reply_base)
107 {
108 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
109 const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
110
111 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
112 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
113 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
114 return -EMSGSIZE;
115
116 if (req_base->flags & ETHTOOL_FLAG_STATS &&
117 pause_put_stats(skb, &data->pausestat))
118 return -EMSGSIZE;
119
120 return 0;
121 }
122
123 const struct ethnl_request_ops ethnl_pause_request_ops = {
124 .request_cmd = ETHTOOL_MSG_PAUSE_GET,
125 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
126 .hdr_attr = ETHTOOL_A_PAUSE_HEADER,
127 .req_info_size = sizeof(struct pause_req_info),
128 .reply_data_size = sizeof(struct pause_reply_data),
129
130 .prepare_data = pause_prepare_data,
131 .reply_size = pause_reply_size,
132 .fill_reply = pause_fill_reply,
133 };
134
135 /* PAUSE_SET */
136
137 const struct nla_policy ethnl_pause_set_policy[] = {
138 [ETHTOOL_A_PAUSE_HEADER] =
139 NLA_POLICY_NESTED(ethnl_header_policy),
140 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
141 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
142 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
143 };
144
ethnl_set_pause(struct sk_buff * skb,struct genl_info * info)145 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
146 {
147 struct ethtool_pauseparam params = {};
148 struct ethnl_req_info req_info = {};
149 struct nlattr **tb = info->attrs;
150 const struct ethtool_ops *ops;
151 struct net_device *dev;
152 bool mod = false;
153 int ret;
154
155 ret = ethnl_parse_header_dev_get(&req_info,
156 tb[ETHTOOL_A_PAUSE_HEADER],
157 genl_info_net(info), info->extack,
158 true);
159 if (ret < 0)
160 return ret;
161 dev = req_info.dev;
162 ops = dev->ethtool_ops;
163 ret = -EOPNOTSUPP;
164 if (!ops->get_pauseparam || !ops->set_pauseparam)
165 goto out_dev;
166
167 rtnl_lock();
168 ret = ethnl_ops_begin(dev);
169 if (ret < 0)
170 goto out_rtnl;
171 ops->get_pauseparam(dev, ¶ms);
172
173 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
174 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
175 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
176 ret = 0;
177 if (!mod)
178 goto out_ops;
179
180 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms);
181 if (ret < 0)
182 goto out_ops;
183 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
184
185 out_ops:
186 ethnl_ops_complete(dev);
187 out_rtnl:
188 rtnl_unlock();
189 out_dev:
190 dev_put(dev);
191 return ret;
192 }
193