1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2022-2023 NXP
4 */
5 #include "common.h"
6 #include "netlink.h"
7
8 struct mm_req_info {
9 struct ethnl_req_info base;
10 };
11
12 struct mm_reply_data {
13 struct ethnl_reply_data base;
14 struct ethtool_mm_state state;
15 struct ethtool_mm_stats stats;
16 };
17
18 #define MM_REPDATA(__reply_base) \
19 container_of(__reply_base, struct mm_reply_data, base)
20
21 #define ETHTOOL_MM_STAT_CNT \
22 (__ETHTOOL_A_MM_STAT_CNT - (ETHTOOL_A_MM_STAT_PAD + 1))
23
24 const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1] = {
25 [ETHTOOL_A_MM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_stats),
26 };
27
28 static int mm_prepare_data(const struct ethnl_req_info *req_base,
29 struct ethnl_reply_data *reply_base,
30 const struct genl_info *info)
31 {
32 struct mm_reply_data *data = MM_REPDATA(reply_base);
33 struct net_device *dev = reply_base->dev;
34 const struct ethtool_ops *ops;
35 int ret;
36
37 ops = dev->ethtool_ops;
38
39 if (!ops->get_mm)
40 return -EOPNOTSUPP;
41
42 ethtool_stats_init((u64 *)&data->stats,
43 sizeof(data->stats) / sizeof(u64));
44
45 ret = ethnl_ops_begin(dev);
46 if (ret < 0)
47 return ret;
48
49 ret = ops->get_mm(dev, &data->state);
50 if (ret)
51 goto out_complete;
52
53 if (ops->get_mm_stats && (req_base->flags & ETHTOOL_FLAG_STATS))
54 ops->get_mm_stats(dev, &data->stats);
55
56 out_complete:
57 ethnl_ops_complete(dev);
58
59 return ret;
60 }
61
62 static int mm_reply_size(const struct ethnl_req_info *req_base,
63 const struct ethnl_reply_data *reply_base)
64 {
65 int len = 0;
66
67 len += nla_total_size(sizeof(u8)); /* _MM_PMAC_ENABLED */
68 len += nla_total_size(sizeof(u8)); /* _MM_TX_ENABLED */
69 len += nla_total_size(sizeof(u8)); /* _MM_TX_ACTIVE */
70 len += nla_total_size(sizeof(u8)); /* _MM_VERIFY_ENABLED */
71 len += nla_total_size(sizeof(u8)); /* _MM_VERIFY_STATUS */
72 len += nla_total_size(sizeof(u32)); /* _MM_VERIFY_TIME */
73 len += nla_total_size(sizeof(u32)); /* _MM_MAX_VERIFY_TIME */
74 len += nla_total_size(sizeof(u32)); /* _MM_TX_MIN_FRAG_SIZE */
75 len += nla_total_size(sizeof(u32)); /* _MM_RX_MIN_FRAG_SIZE */
76
77 if (req_base->flags & ETHTOOL_FLAG_STATS)
78 len += nla_total_size(0) + /* _MM_STATS */
79 nla_total_size_64bit(sizeof(u64)) * ETHTOOL_MM_STAT_CNT;
80
81 return len;
82 }
83
84 static int mm_put_stat(struct sk_buff *skb, u64 val, u16 attrtype)
85 {
86 if (val == ETHTOOL_STAT_NOT_SET)
87 return 0;
88 if (nla_put_u64_64bit(skb, attrtype, val, ETHTOOL_A_MM_STAT_PAD))
89 return -EMSGSIZE;
90 return 0;
91 }
92
93 static int mm_put_stats(struct sk_buff *skb,
94 const struct ethtool_mm_stats *stats)
95 {
96 struct nlattr *nest;
97
98 nest = nla_nest_start(skb, ETHTOOL_A_MM_STATS);
99 if (!nest)
100 return -EMSGSIZE;
101
102 if (mm_put_stat(skb, stats->MACMergeFrameAssErrorCount,
103 ETHTOOL_A_MM_STAT_REASSEMBLY_ERRORS) ||
104 mm_put_stat(skb, stats->MACMergeFrameSmdErrorCount,
105 ETHTOOL_A_MM_STAT_SMD_ERRORS) ||
106 mm_put_stat(skb, stats->MACMergeFrameAssOkCount,
107 ETHTOOL_A_MM_STAT_REASSEMBLY_OK) ||
108 mm_put_stat(skb, stats->MACMergeFragCountRx,
109 ETHTOOL_A_MM_STAT_RX_FRAG_COUNT) ||
110 mm_put_stat(skb, stats->MACMergeFragCountTx,
111 ETHTOOL_A_MM_STAT_TX_FRAG_COUNT) ||
112 mm_put_stat(skb, stats->MACMergeHoldCount,
113 ETHTOOL_A_MM_STAT_HOLD_COUNT))
114 goto err_cancel;
115
116 nla_nest_end(skb, nest);
117 return 0;
118
119 err_cancel:
120 nla_nest_cancel(skb, nest);
121 return -EMSGSIZE;
122 }
123
124 static int mm_fill_reply(struct sk_buff *skb,
125 const struct ethnl_req_info *req_base,
126 const struct ethnl_reply_data *reply_base)
127 {
128 const struct mm_reply_data *data = MM_REPDATA(reply_base);
129 const struct ethtool_mm_state *state = &data->state;
130
131 if (nla_put_u8(skb, ETHTOOL_A_MM_TX_ENABLED, state->tx_enabled) ||
132 nla_put_u8(skb, ETHTOOL_A_MM_TX_ACTIVE, state->tx_active) ||
133 nla_put_u8(skb, ETHTOOL_A_MM_PMAC_ENABLED, state->pmac_enabled) ||
134 nla_put_u8(skb, ETHTOOL_A_MM_VERIFY_ENABLED, state->verify_enabled) ||
135 nla_put_u8(skb, ETHTOOL_A_MM_VERIFY_STATUS, state->verify_status) ||
136 nla_put_u32(skb, ETHTOOL_A_MM_VERIFY_TIME, state->verify_time) ||
137 nla_put_u32(skb, ETHTOOL_A_MM_MAX_VERIFY_TIME, state->max_verify_time) ||
138 nla_put_u32(skb, ETHTOOL_A_MM_TX_MIN_FRAG_SIZE, state->tx_min_frag_size) ||
139 nla_put_u32(skb, ETHTOOL_A_MM_RX_MIN_FRAG_SIZE, state->rx_min_frag_size))
140 return -EMSGSIZE;
141
142 if (req_base->flags & ETHTOOL_FLAG_STATS &&
143 mm_put_stats(skb, &data->stats))
144 return -EMSGSIZE;
145
146 return 0;
147 }
148
149 const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1] = {
150 [ETHTOOL_A_MM_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
151 [ETHTOOL_A_MM_VERIFY_ENABLED] = NLA_POLICY_MAX(NLA_U8, 1),
152 [ETHTOOL_A_MM_VERIFY_TIME] = NLA_POLICY_RANGE(NLA_U32, 1, 128),
153 [ETHTOOL_A_MM_TX_ENABLED] = NLA_POLICY_MAX(NLA_U8, 1),
154 [ETHTOOL_A_MM_PMAC_ENABLED] = NLA_POLICY_MAX(NLA_U8, 1),
155 [ETHTOOL_A_MM_TX_MIN_FRAG_SIZE] = NLA_POLICY_RANGE(NLA_U32, 60, 252),
156 };
157
158 static void mm_state_to_cfg(const struct ethtool_mm_state *state,
159 struct ethtool_mm_cfg *cfg)
160 {
161 /* We could also compare state->verify_status against
162 * ETHTOOL_MM_VERIFY_STATUS_DISABLED, but state->verify_enabled
163 * is more like an administrative state which should be seen in
164 * ETHTOOL_MSG_MM_GET replies. For example, a port with verification
165 * disabled might be in the ETHTOOL_MM_VERIFY_STATUS_INITIAL
166 * if it's down.
167 */
168 cfg->verify_enabled = state->verify_enabled;
169 cfg->verify_time = state->verify_time;
170 cfg->tx_enabled = state->tx_enabled;
171 cfg->pmac_enabled = state->pmac_enabled;
172 cfg->tx_min_frag_size = state->tx_min_frag_size;
173 }
174
175 static int
176 ethnl_set_mm_validate(struct ethnl_req_info *req_info, struct genl_info *info)
177 {
178 const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
179
180 return ops->get_mm && ops->set_mm ? 1 : -EOPNOTSUPP;
181 }
182
183 static int ethnl_set_mm(struct ethnl_req_info *req_info, struct genl_info *info)
184 {
185 struct netlink_ext_ack *extack = info->extack;
186 struct net_device *dev = req_info->dev;
187 struct ethtool_mm_state state = {};
188 struct nlattr **tb = info->attrs;
189 struct ethtool_mm_cfg cfg = {};
190 bool mod = false;
191 int ret;
192
193 ret = dev->ethtool_ops->get_mm(dev, &state);
194 if (ret)
195 return ret;
196
197 mm_state_to_cfg(&state, &cfg);
198
199 ethnl_update_bool(&cfg.verify_enabled, tb[ETHTOOL_A_MM_VERIFY_ENABLED],
200 &mod);
201 ethnl_update_u32(&cfg.verify_time, tb[ETHTOOL_A_MM_VERIFY_TIME], &mod);
202 ethnl_update_bool(&cfg.tx_enabled, tb[ETHTOOL_A_MM_TX_ENABLED], &mod);
203 ethnl_update_bool(&cfg.pmac_enabled, tb[ETHTOOL_A_MM_PMAC_ENABLED],
204 &mod);
205 ethnl_update_u32(&cfg.tx_min_frag_size,
206 tb[ETHTOOL_A_MM_TX_MIN_FRAG_SIZE], &mod);
207
208 if (!mod)
209 return 0;
210
211 if (cfg.verify_time > state.max_verify_time) {
212 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_MM_VERIFY_TIME],
213 "verifyTime exceeds device maximum");
214 return -ERANGE;
215 }
216
217 if (cfg.verify_enabled && !cfg.tx_enabled) {
218 NL_SET_ERR_MSG(extack, "Verification requires TX enabled");
219 return -EINVAL;
220 }
221
222 if (cfg.tx_enabled && !cfg.pmac_enabled) {
223 NL_SET_ERR_MSG(extack, "TX enabled requires pMAC enabled");
224 return -EINVAL;
225 }
226
227 ret = dev->ethtool_ops->set_mm(dev, &cfg, extack);
228 return ret < 0 ? ret : 1;
229 }
230
231 const struct ethnl_request_ops ethnl_mm_request_ops = {
232 .request_cmd = ETHTOOL_MSG_MM_GET,
233 .reply_cmd = ETHTOOL_MSG_MM_GET_REPLY,
234 .hdr_attr = ETHTOOL_A_MM_HEADER,
235 .req_info_size = sizeof(struct mm_req_info),
236 .reply_data_size = sizeof(struct mm_reply_data),
237
238 .prepare_data = mm_prepare_data,
239 .reply_size = mm_reply_size,
240 .fill_reply = mm_fill_reply,
241
242 .set_validate = ethnl_set_mm_validate,
243 .set = ethnl_set_mm,
244 .set_ntf_cmd = ETHTOOL_MSG_MM_NTF,
245 };
246
247 /* Returns whether a given device supports the MAC merge layer
248 * (has an eMAC and a pMAC). Must be called under rtnl_lock() and
249 * ethnl_ops_begin().
250 */
251 bool __ethtool_dev_mm_supported(struct net_device *dev)
252 {
253 const struct ethtool_ops *ops = dev->ethtool_ops;
254 struct ethtool_mm_state state = {};
255 int ret = -EOPNOTSUPP;
256
257 if (ops && ops->get_mm)
258 ret = ops->get_mm(dev, &state);
259
260 return !ret;
261 }
262
263 bool ethtool_dev_mm_supported(struct net_device *dev)
264 {
265 const struct ethtool_ops *ops = dev->ethtool_ops;
266 bool supported;
267 int ret;
268
269 ASSERT_RTNL();
270
271 if (!ops)
272 return false;
273
274 ret = ethnl_ops_begin(dev);
275 if (ret < 0)
276 return false;
277
278 supported = __ethtool_dev_mm_supported(dev);
279
280 ethnl_ops_complete(dev);
281
282 return supported;
283 }
284 EXPORT_SYMBOL_GPL(ethtool_dev_mm_supported);
285
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