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 ret = ethnl_ops_begin(dev);
42 if (ret < 0)
43 return ret;
44 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
45 if (req_base->flags & ETHTOOL_FLAG_STATS &&
46 dev->ethtool_ops->get_pause_stats) {
47 ethtool_stats_init((u64 *)&data->pausestat,
48 sizeof(data->pausestat) / 8);
49 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
50 }
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)) *
66 (ETHTOOL_A_PAUSE_STAT_MAX - 2);
67 return n;
68 }
69
ethtool_put_stat(struct sk_buff * skb,u64 val,u16 attrtype,u16 padtype)70 static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
71 u16 padtype)
72 {
73 if (val == ETHTOOL_STAT_NOT_SET)
74 return 0;
75 if (nla_put_u64_64bit(skb, attrtype, val, padtype))
76 return -EMSGSIZE;
77
78 return 0;
79 }
80
pause_put_stats(struct sk_buff * skb,const struct ethtool_pause_stats * pause_stats)81 static int pause_put_stats(struct sk_buff *skb,
82 const struct ethtool_pause_stats *pause_stats)
83 {
84 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
85 struct nlattr *nest;
86
87 nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
88 if (!nest)
89 return -EMSGSIZE;
90
91 if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
92 ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
93 ethtool_put_stat(skb, pause_stats->rx_pause_frames,
94 ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
95 goto err_cancel;
96
97 nla_nest_end(skb, nest);
98 return 0;
99
100 err_cancel:
101 nla_nest_cancel(skb, nest);
102 return -EMSGSIZE;
103 }
104
pause_fill_reply(struct sk_buff * skb,const struct ethnl_req_info * req_base,const struct ethnl_reply_data * reply_base)105 static int pause_fill_reply(struct sk_buff *skb,
106 const struct ethnl_req_info *req_base,
107 const struct ethnl_reply_data *reply_base)
108 {
109 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
110 const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
111
112 if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
113 nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
114 nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
115 return -EMSGSIZE;
116
117 if (req_base->flags & ETHTOOL_FLAG_STATS &&
118 pause_put_stats(skb, &data->pausestat))
119 return -EMSGSIZE;
120
121 return 0;
122 }
123
124 const struct ethnl_request_ops ethnl_pause_request_ops = {
125 .request_cmd = ETHTOOL_MSG_PAUSE_GET,
126 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
127 .hdr_attr = ETHTOOL_A_PAUSE_HEADER,
128 .req_info_size = sizeof(struct pause_req_info),
129 .reply_data_size = sizeof(struct pause_reply_data),
130
131 .prepare_data = pause_prepare_data,
132 .reply_size = pause_reply_size,
133 .fill_reply = pause_fill_reply,
134 };
135
136 /* PAUSE_SET */
137
138 const struct nla_policy ethnl_pause_set_policy[] = {
139 [ETHTOOL_A_PAUSE_HEADER] =
140 NLA_POLICY_NESTED(ethnl_header_policy),
141 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
142 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
143 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
144 };
145
ethnl_set_pause(struct sk_buff * skb,struct genl_info * info)146 int ethnl_set_pause(struct sk_buff *skb, struct genl_info *info)
147 {
148 struct ethtool_pauseparam params = {};
149 struct ethnl_req_info req_info = {};
150 struct nlattr **tb = info->attrs;
151 const struct ethtool_ops *ops;
152 struct net_device *dev;
153 bool mod = false;
154 int ret;
155
156 ret = ethnl_parse_header_dev_get(&req_info,
157 tb[ETHTOOL_A_PAUSE_HEADER],
158 genl_info_net(info), info->extack,
159 true);
160 if (ret < 0)
161 return ret;
162 dev = req_info.dev;
163 ops = dev->ethtool_ops;
164 ret = -EOPNOTSUPP;
165 if (!ops->get_pauseparam || !ops->set_pauseparam)
166 goto out_dev;
167
168 rtnl_lock();
169 ret = ethnl_ops_begin(dev);
170 if (ret < 0)
171 goto out_rtnl;
172 ops->get_pauseparam(dev, ¶ms);
173
174 ethnl_update_bool32(¶ms.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
175 ethnl_update_bool32(¶ms.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
176 ethnl_update_bool32(¶ms.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
177 ret = 0;
178 if (!mod)
179 goto out_ops;
180
181 ret = dev->ethtool_ops->set_pauseparam(dev, ¶ms);
182 if (ret < 0)
183 goto out_ops;
184 ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
185
186 out_ops:
187 ethnl_ops_complete(dev);
188 out_rtnl:
189 rtnl_unlock();
190 out_dev:
191 dev_put(dev);
192 return ret;
193 }
194
