1// SPDX-License-Identifier: GPL-2.0-only
2
3#include "netlink.h"
4#include "common.h"
5
6struct pause_req_info {
7 struct ethnl_req_info base;
8 enum ethtool_mac_stats_src src;
9};
10
11#define PAUSE_REQINFO(__req_base) \
12 container_of(__req_base, struct pause_req_info, base)
13
14struct pause_reply_data {
15 struct ethnl_reply_data base;
16 struct ethtool_pauseparam pauseparam;
17 struct ethtool_pause_stats pausestat;
18};
19
20#define PAUSE_REPDATA(__reply_base) \
21 container_of(__reply_base, struct pause_reply_data, base)
22
23const struct nla_policy ethnl_pause_get_policy[] = {
24 [ETHTOOL_A_PAUSE_HEADER] =
25 NLA_POLICY_NESTED(ethnl_header_policy_stats),
26 [ETHTOOL_A_PAUSE_STATS_SRC] =
27 NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
28};
29
30static int pause_parse_request(struct ethnl_req_info *req_base,
31 struct nlattr **tb,
32 struct netlink_ext_ack *extack)
33{
34 enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
35 struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
36
37 if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
38 if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
39 NL_SET_ERR_MSG_MOD(extack,
40 "ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
41 return -EINVAL;
42 }
43
44 src = nla_get_u32(nla: tb[ETHTOOL_A_PAUSE_STATS_SRC]);
45 }
46
47 req_info->src = src;
48
49 return 0;
50}
51
52static int pause_prepare_data(const struct ethnl_req_info *req_base,
53 struct ethnl_reply_data *reply_base,
54 const struct genl_info *info)
55{
56 const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
57 struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
58 enum ethtool_mac_stats_src src = req_info->src;
59 struct net_device *dev = reply_base->dev;
60 int ret;
61
62 if (!dev->ethtool_ops->get_pauseparam)
63 return -EOPNOTSUPP;
64
65 ethtool_stats_init(stats: (u64 *)&data->pausestat,
66 n: sizeof(data->pausestat) / 8);
67 data->pausestat.src = src;
68
69 ret = ethnl_ops_begin(dev);
70 if (ret < 0)
71 return ret;
72
73 if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
74 src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
75 !__ethtool_dev_mm_supported(dev)) {
76 NL_SET_ERR_MSG_MOD(info->extack,
77 "Device does not support MAC merge layer");
78 ethnl_ops_complete(dev);
79 return -EOPNOTSUPP;
80 }
81
82 dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
83 if (req_base->flags & ETHTOOL_FLAG_STATS &&
84 dev->ethtool_ops->get_pause_stats)
85 dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
86
87 ethnl_ops_complete(dev);
88
89 return 0;
90}
91
92static int pause_reply_size(const struct ethnl_req_info *req_base,
93 const struct ethnl_reply_data *reply_base)
94{
95 int n = nla_total_size(payload: sizeof(u8)) + /* _PAUSE_AUTONEG */
96 nla_total_size(payload: sizeof(u8)) + /* _PAUSE_RX */
97 nla_total_size(payload: sizeof(u8)); /* _PAUSE_TX */
98
99 if (req_base->flags & ETHTOOL_FLAG_STATS)
100 n += nla_total_size(payload: 0) + /* _PAUSE_STATS */
101 nla_total_size(payload: sizeof(u32)) + /* _PAUSE_STATS_SRC */
102 nla_total_size_64bit(payload: sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
103 return n;
104}
105
106static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
107 u16 padtype)
108{
109 if (val == ETHTOOL_STAT_NOT_SET)
110 return 0;
111 if (nla_put_u64_64bit(skb, attrtype, value: val, padattr: padtype))
112 return -EMSGSIZE;
113
114 return 0;
115}
116
117static int pause_put_stats(struct sk_buff *skb,
118 const struct ethtool_pause_stats *pause_stats)
119{
120 const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
121 struct nlattr *nest;
122
123 if (nla_put_u32(skb, attrtype: ETHTOOL_A_PAUSE_STATS_SRC, value: pause_stats->src))
124 return -EMSGSIZE;
125
126 nest = nla_nest_start(skb, attrtype: ETHTOOL_A_PAUSE_STATS);
127 if (!nest)
128 return -EMSGSIZE;
129
130 if (ethtool_put_stat(skb, val: pause_stats->tx_pause_frames,
131 attrtype: ETHTOOL_A_PAUSE_STAT_TX_FRAMES, padtype: pad) ||
132 ethtool_put_stat(skb, val: pause_stats->rx_pause_frames,
133 attrtype: ETHTOOL_A_PAUSE_STAT_RX_FRAMES, padtype: pad))
134 goto err_cancel;
135
136 nla_nest_end(skb, start: nest);
137 return 0;
138
139err_cancel:
140 nla_nest_cancel(skb, start: nest);
141 return -EMSGSIZE;
142}
143
144static int pause_fill_reply(struct sk_buff *skb,
145 const struct ethnl_req_info *req_base,
146 const struct ethnl_reply_data *reply_base)
147{
148 const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
149 const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
150
151 if (nla_put_u8(skb, attrtype: ETHTOOL_A_PAUSE_AUTONEG, value: !!pauseparam->autoneg) ||
152 nla_put_u8(skb, attrtype: ETHTOOL_A_PAUSE_RX, value: !!pauseparam->rx_pause) ||
153 nla_put_u8(skb, attrtype: ETHTOOL_A_PAUSE_TX, value: !!pauseparam->tx_pause))
154 return -EMSGSIZE;
155
156 if (req_base->flags & ETHTOOL_FLAG_STATS &&
157 pause_put_stats(skb, pause_stats: &data->pausestat))
158 return -EMSGSIZE;
159
160 return 0;
161}
162
163/* PAUSE_SET */
164
165const struct nla_policy ethnl_pause_set_policy[] = {
166 [ETHTOOL_A_PAUSE_HEADER] =
167 NLA_POLICY_NESTED(ethnl_header_policy),
168 [ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
169 [ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
170 [ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
171 [ETHTOOL_A_PAUSE_STATS_SRC] = { .type = NLA_REJECT },
172};
173
174static int
175ethnl_set_pause_validate(struct ethnl_req_info *req_info,
176 struct genl_info *info)
177{
178 const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
179
180 return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
181}
182
183static int
184ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
185{
186 struct net_device *dev = req_info->dev;
187 struct ethtool_pauseparam params = {};
188 struct nlattr **tb = info->attrs;
189 bool mod = false;
190 int ret;
191
192 dev->ethtool_ops->get_pauseparam(dev, &params);
193
194 ethnl_update_bool32(dst: &params.autoneg, attr: tb[ETHTOOL_A_PAUSE_AUTONEG], mod: &mod);
195 ethnl_update_bool32(dst: &params.rx_pause, attr: tb[ETHTOOL_A_PAUSE_RX], mod: &mod);
196 ethnl_update_bool32(dst: &params.tx_pause, attr: tb[ETHTOOL_A_PAUSE_TX], mod: &mod);
197 if (!mod)
198 return 0;
199
200 ret = dev->ethtool_ops->set_pauseparam(dev, &params);
201 return ret < 0 ? ret : 1;
202}
203
204const struct ethnl_request_ops ethnl_pause_request_ops = {
205 .request_cmd = ETHTOOL_MSG_PAUSE_GET,
206 .reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
207 .hdr_attr = ETHTOOL_A_PAUSE_HEADER,
208 .req_info_size = sizeof(struct pause_req_info),
209 .reply_data_size = sizeof(struct pause_reply_data),
210
211 .parse_request = pause_parse_request,
212 .prepare_data = pause_prepare_data,
213 .reply_size = pause_reply_size,
214 .fill_reply = pause_fill_reply,
215
216 .set_validate = ethnl_set_pause_validate,
217 .set = ethnl_set_pause,
218 .set_ntf_cmd = ETHTOOL_MSG_PAUSE_NTF,
219};
220

source code of linux/net/ethtool/pause.c