summaryrefslogtreecommitdiff
path: root/drivers/net/dsa/sja1105/sja1105_flower.c
blob: 72b9b39b0989d265d9902d18804e75f8502423b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2020 NXP
 */
#include "sja1105.h"
#include "sja1105_vl.h"

struct sja1105_rule *sja1105_rule_find(struct sja1105_private *priv,
				       unsigned long cookie)
{
	struct sja1105_rule *rule;

	list_for_each_entry(rule, &priv->flow_block.rules, list)
		if (rule->cookie == cookie)
			return rule;

	return NULL;
}

static int sja1105_find_free_l2_policer(struct sja1105_private *priv)
{
	int i;

	for (i = 0; i < SJA1105_NUM_L2_POLICERS; i++)
		if (!priv->flow_block.l2_policer_used[i])
			return i;

	return -1;
}

static int sja1105_setup_bcast_policer(struct sja1105_private *priv,
				       struct netlink_ext_ack *extack,
				       unsigned long cookie, int port,
				       u64 rate_bytes_per_sec,
				       u32 burst)
{
	struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
	struct sja1105_l2_policing_entry *policing;
	struct dsa_switch *ds = priv->ds;
	bool new_rule = false;
	unsigned long p;
	int rc;

	if (!rule) {
		rule = kzalloc(sizeof(*rule), GFP_KERNEL);
		if (!rule)
			return -ENOMEM;

		rule->cookie = cookie;
		rule->type = SJA1105_RULE_BCAST_POLICER;
		rule->bcast_pol.sharindx = sja1105_find_free_l2_policer(priv);
		rule->key.type = SJA1105_KEY_BCAST;
		new_rule = true;
	}

	if (rule->bcast_pol.sharindx == -1) {
		NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
		rc = -ENOSPC;
		goto out;
	}

	policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;

	if (policing[(ds->num_ports * SJA1105_NUM_TC) + port].sharindx != port) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Port already has a broadcast policer");
		rc = -EEXIST;
		goto out;
	}

	rule->port_mask |= BIT(port);

	/* Make the broadcast policers of all ports attached to this block
	 * point to the newly allocated policer
	 */
	for_each_set_bit(p, &rule->port_mask, SJA1105_MAX_NUM_PORTS) {
		int bcast = (ds->num_ports * SJA1105_NUM_TC) + p;

		policing[bcast].sharindx = rule->bcast_pol.sharindx;
	}

	policing[rule->bcast_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
							  512, 1000000);
	policing[rule->bcast_pol.sharindx].smax = burst;

	/* TODO: support per-flow MTU */
	policing[rule->bcast_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
						    ETH_FCS_LEN;

	rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);

out:
	if (rc == 0 && new_rule) {
		priv->flow_block.l2_policer_used[rule->bcast_pol.sharindx] = true;
		list_add(&rule->list, &priv->flow_block.rules);
	} else if (new_rule) {
		kfree(rule);
	}

	return rc;
}

static int sja1105_setup_tc_policer(struct sja1105_private *priv,
				    struct netlink_ext_ack *extack,
				    unsigned long cookie, int port, int tc,
				    u64 rate_bytes_per_sec,
				    u32 burst)
{
	struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
	struct sja1105_l2_policing_entry *policing;
	bool new_rule = false;
	unsigned long p;
	int rc;

	if (!rule) {
		rule = kzalloc(sizeof(*rule), GFP_KERNEL);
		if (!rule)
			return -ENOMEM;

		rule->cookie = cookie;
		rule->type = SJA1105_RULE_TC_POLICER;
		rule->tc_pol.sharindx = sja1105_find_free_l2_policer(priv);
		rule->key.type = SJA1105_KEY_TC;
		rule->key.tc.pcp = tc;
		new_rule = true;
	}

	if (rule->tc_pol.sharindx == -1) {
		NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
		rc = -ENOSPC;
		goto out;
	}

	policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;

	if (policing[(port * SJA1105_NUM_TC) + tc].sharindx != port) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Port-TC pair already has an L2 policer");
		rc = -EEXIST;
		goto out;
	}

	rule->port_mask |= BIT(port);

	/* Make the policers for traffic class @tc of all ports attached to
	 * this block point to the newly allocated policer
	 */
	for_each_set_bit(p, &rule->port_mask, SJA1105_MAX_NUM_PORTS) {
		int index = (p * SJA1105_NUM_TC) + tc;

		policing[index].sharindx = rule->tc_pol.sharindx;
	}

	policing[rule->tc_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
						       512, 1000000);
	policing[rule->tc_pol.sharindx].smax = burst;

	/* TODO: support per-flow MTU */
	policing[rule->tc_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
						 ETH_FCS_LEN;

	rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);

out:
	if (rc == 0 && new_rule) {
		priv->flow_block.l2_policer_used[rule->tc_pol.sharindx] = true;
		list_add(&rule->list, &priv->flow_block.rules);
	} else if (new_rule) {
		kfree(rule);
	}

	return rc;
}

static int sja1105_flower_policer(struct sja1105_private *priv, int port,
				  struct netlink_ext_ack *extack,
				  unsigned long cookie,
				  struct sja1105_key *key,
				  u64 rate_bytes_per_sec,
				  u32 burst)
{
	switch (key->type) {
	case SJA1105_KEY_BCAST:
		return sja1105_setup_bcast_policer(priv, extack, cookie, port,
						   rate_bytes_per_sec, burst);
	case SJA1105_KEY_TC:
		return sja1105_setup_tc_policer(priv, extack, cookie, port,
						key->tc.pcp, rate_bytes_per_sec,
						burst);
	default:
		NL_SET_ERR_MSG_MOD(extack, "Unknown keys for policing");
		return -EOPNOTSUPP;
	}
}

static int sja1105_flower_parse_key(struct sja1105_private *priv,
				    struct netlink_ext_ack *extack,
				    struct flow_cls_offload *cls,
				    struct sja1105_key *key)
{
	struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
	struct flow_dissector *dissector = rule->match.dissector;
	bool is_bcast_dmac = false;
	u64 dmac = U64_MAX;
	u16 vid = U16_MAX;
	u16 pcp = U16_MAX;

	if (dissector->used_keys &
	    ~(BIT(FLOW_DISSECTOR_KEY_BASIC) |
	      BIT(FLOW_DISSECTOR_KEY_CONTROL) |
	      BIT(FLOW_DISSECTOR_KEY_VLAN) |
	      BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS))) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Unsupported keys used");
		return -EOPNOTSUPP;
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
		struct flow_match_basic match;

		flow_rule_match_basic(rule, &match);
		if (match.key->n_proto) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Matching on protocol not supported");
			return -EOPNOTSUPP;
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
		u8 bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
		u8 null[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
		struct flow_match_eth_addrs match;

		flow_rule_match_eth_addrs(rule, &match);

		if (!ether_addr_equal_masked(match.key->src, null,
					     match.mask->src)) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Matching on source MAC not supported");
			return -EOPNOTSUPP;
		}

		if (!ether_addr_equal(match.mask->dst, bcast)) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Masked matching on MAC not supported");
			return -EOPNOTSUPP;
		}

		dmac = ether_addr_to_u64(match.key->dst);
		is_bcast_dmac = ether_addr_equal(match.key->dst, bcast);
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
		struct flow_match_vlan match;

		flow_rule_match_vlan(rule, &match);

		if (match.mask->vlan_id &&
		    match.mask->vlan_id != VLAN_VID_MASK) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Masked matching on VID is not supported");
			return -EOPNOTSUPP;
		}

		if (match.mask->vlan_priority &&
		    match.mask->vlan_priority != 0x7) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Masked matching on PCP is not supported");
			return -EOPNOTSUPP;
		}

		if (match.mask->vlan_id)
			vid = match.key->vlan_id;
		if (match.mask->vlan_priority)
			pcp = match.key->vlan_priority;
	}

	if (is_bcast_dmac && vid == U16_MAX && pcp == U16_MAX) {
		key->type = SJA1105_KEY_BCAST;
		return 0;
	}
	if (dmac == U64_MAX && vid == U16_MAX && pcp != U16_MAX) {
		key->type = SJA1105_KEY_TC;
		key->tc.pcp = pcp;
		return 0;
	}
	if (dmac != U64_MAX && vid != U16_MAX && pcp != U16_MAX) {
		key->type = SJA1105_KEY_VLAN_AWARE_VL;
		key->vl.dmac = dmac;
		key->vl.vid = vid;
		key->vl.pcp = pcp;
		return 0;
	}
	if (dmac != U64_MAX) {
		key->type = SJA1105_KEY_VLAN_UNAWARE_VL;
		key->vl.dmac = dmac;
		return 0;
	}

	NL_SET_ERR_MSG_MOD(extack, "Not matching on any known key");
	return -EOPNOTSUPP;
}

int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
			   struct flow_cls_offload *cls, bool ingress)
{
	struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
	struct netlink_ext_ack *extack = cls->common.extack;
	struct sja1105_private *priv = ds->priv;
	const struct flow_action_entry *act;
	unsigned long cookie = cls->cookie;
	bool routing_rule = false;
	struct sja1105_key key;
	bool gate_rule = false;
	bool vl_rule = false;
	int rc, i;

	rc = sja1105_flower_parse_key(priv, extack, cls, &key);
	if (rc)
		return rc;

	flow_action_for_each(i, act, &rule->action) {
		switch (act->id) {
		case FLOW_ACTION_POLICE:
			if (act->police.rate_pkt_ps) {
				NL_SET_ERR_MSG_MOD(extack,
						   "QoS offload not support packets per second");
				rc = -EOPNOTSUPP;
				goto out;
			}

			rc = sja1105_flower_policer(priv, port, extack, cookie,
						    &key,
						    act->police.rate_bytes_ps,
						    act->police.burst);
			if (rc)
				goto out;
			break;
		case FLOW_ACTION_TRAP: {
			int cpu = dsa_upstream_port(ds, port);

			routing_rule = true;
			vl_rule = true;

			rc = sja1105_vl_redirect(priv, port, extack, cookie,
						 &key, BIT(cpu), true);
			if (rc)
				goto out;
			break;
		}
		case FLOW_ACTION_REDIRECT: {
			struct dsa_port *to_dp;

			to_dp = dsa_port_from_netdev(act->dev);
			if (IS_ERR(to_dp)) {
				NL_SET_ERR_MSG_MOD(extack,
						   "Destination not a switch port");
				return -EOPNOTSUPP;
			}

			routing_rule = true;
			vl_rule = true;

			rc = sja1105_vl_redirect(priv, port, extack, cookie,
						 &key, BIT(to_dp->index), true);
			if (rc)
				goto out;
			break;
		}
		case FLOW_ACTION_DROP:
			vl_rule = true;

			rc = sja1105_vl_redirect(priv, port, extack, cookie,
						 &key, 0, false);
			if (rc)
				goto out;
			break;
		case FLOW_ACTION_GATE:
			gate_rule = true;
			vl_rule = true;

			rc = sja1105_vl_gate(priv, port, extack, cookie,
					     &key, act->gate.index,
					     act->gate.prio,
					     act->gate.basetime,
					     act->gate.cycletime,
					     act->gate.cycletimeext,
					     act->gate.num_entries,
					     act->gate.entries);
			if (rc)
				goto out;
			break;
		default:
			NL_SET_ERR_MSG_MOD(extack,
					   "Action not supported");
			rc = -EOPNOTSUPP;
			goto out;
		}
	}

	if (vl_rule && !rc) {
		/* Delay scheduling configuration until DESTPORTS has been
		 * populated by all other actions.
		 */
		if (gate_rule) {
			if (!routing_rule) {
				NL_SET_ERR_MSG_MOD(extack,
						   "Can only offload gate action together with redirect or trap");
				return -EOPNOTSUPP;
			}
			rc = sja1105_init_scheduling(priv);
			if (rc)
				goto out;
		}

		rc = sja1105_static_config_reload(priv, SJA1105_VIRTUAL_LINKS);
	}

out:
	return rc;
}

int sja1105_cls_flower_del(struct dsa_switch *ds, int port,
			   struct flow_cls_offload *cls, bool ingress)
{
	struct sja1105_private *priv = ds->priv;
	struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
	struct sja1105_l2_policing_entry *policing;
	int old_sharindx;

	if (!rule)
		return 0;

	if (rule->type == SJA1105_RULE_VL)
		return sja1105_vl_delete(priv, port, rule, cls->common.extack);

	policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;

	if (rule->type == SJA1105_RULE_BCAST_POLICER) {
		int bcast = (ds->num_ports * SJA1105_NUM_TC) + port;

		old_sharindx = policing[bcast].sharindx;
		policing[bcast].sharindx = port;
	} else if (rule->type == SJA1105_RULE_TC_POLICER) {
		int index = (port * SJA1105_NUM_TC) + rule->key.tc.pcp;

		old_sharindx = policing[index].sharindx;
		policing[index].sharindx = port;
	} else {
		return -EINVAL;
	}

	rule->port_mask &= ~BIT(port);
	if (!rule->port_mask) {
		priv->flow_block.l2_policer_used[old_sharindx] = false;
		list_del(&rule->list);
		kfree(rule);
	}

	return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
}

int sja1105_cls_flower_stats(struct dsa_switch *ds, int port,
			     struct flow_cls_offload *cls, bool ingress)
{
	struct sja1105_private *priv = ds->priv;
	struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
	int rc;

	if (!rule)
		return 0;

	if (rule->type != SJA1105_RULE_VL)
		return 0;

	rc = sja1105_vl_stats(priv, port, rule, &cls->stats,
			      cls->common.extack);
	if (rc)
		return rc;

	return 0;
}

void sja1105_flower_setup(struct dsa_switch *ds)
{
	struct sja1105_private *priv = ds->priv;
	int port;

	INIT_LIST_HEAD(&priv->flow_block.rules);

	for (port = 0; port < ds->num_ports; port++)
		priv->flow_block.l2_policer_used[port] = true;
}

void sja1105_flower_teardown(struct dsa_switch *ds)
{
	struct sja1105_private *priv = ds->priv;
	struct sja1105_rule *rule;
	struct list_head *pos, *n;

	list_for_each_safe(pos, n, &priv->flow_block.rules) {
		rule = list_entry(pos, struct sja1105_rule, list);
		list_del(&rule->list);
		kfree(rule);
	}
}