1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2022-2023 NXP
4 */
5#include "common.h"
6#include "netlink.h"
7
8struct mm_req_info {
9	struct ethnl_req_info		base;
10};
11
12struct 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
24const 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
28static 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
56out_complete:
57	ethnl_ops_complete(dev);
58
59	return ret;
60}
61
62static 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
84static 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
93static 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
119err_cancel:
120	nla_nest_cancel(skb, nest);
121	return -EMSGSIZE;
122}
123
124static 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
149const 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
158static 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
175static int
176ethnl_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
183static 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
231const 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 */
251bool __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
263bool 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}
284EXPORT_SYMBOL_GPL(ethtool_dev_mm_supported);
285