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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright 2020 NXP
3 */
4#include "sja1105.h"
5#include "sja1105_vl.h"
6
7struct sja1105_rule *sja1105_rule_find(struct sja1105_private *priv,
8 unsigned long cookie)
9{
10 struct sja1105_rule *rule;
11
12 list_for_each_entry(rule, &priv->flow_block.rules, list)
13 if (rule->cookie == cookie)
14 return rule;
15
16 return NULL;
17}
18
19static int sja1105_find_free_l2_policer(struct sja1105_private *priv)
20{
21 int i;
22
23 for (i = 0; i < SJA1105_NUM_L2_POLICERS; i++)
24 if (!priv->flow_block.l2_policer_used[i])
25 return i;
26
27 return -1;
28}
29
30static int sja1105_setup_bcast_policer(struct sja1105_private *priv,
31 struct netlink_ext_ack *extack,
32 unsigned long cookie, int port,
33 u64 rate_bytes_per_sec,
34 u32 burst)
35{
36 struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
37 struct sja1105_l2_policing_entry *policing;
38 struct dsa_switch *ds = priv->ds;
39 bool new_rule = false;
40 unsigned long p;
41 int rc;
42
43 if (!rule) {
44 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
45 if (!rule)
46 return -ENOMEM;
47
48 rule->cookie = cookie;
49 rule->type = SJA1105_RULE_BCAST_POLICER;
50 rule->bcast_pol.sharindx = sja1105_find_free_l2_policer(priv);
51 rule->key.type = SJA1105_KEY_BCAST;
52 new_rule = true;
53 }
54
55 if (rule->bcast_pol.sharindx == -1) {
56 NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
57 rc = -ENOSPC;
58 goto out;
59 }
60
61 policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
62
63 if (policing[(ds->num_ports * SJA1105_NUM_TC) + port].sharindx != port) {
64 NL_SET_ERR_MSG_MOD(extack,
65 "Port already has a broadcast policer");
66 rc = -EEXIST;
67 goto out;
68 }
69
70 rule->port_mask |= BIT(port);
71
72 /* Make the broadcast policers of all ports attached to this block
73 * point to the newly allocated policer
74 */
75 for_each_set_bit(p, &rule->port_mask, SJA1105_MAX_NUM_PORTS) {
76 int bcast = (ds->num_ports * SJA1105_NUM_TC) + p;
77
78 policing[bcast].sharindx = rule->bcast_pol.sharindx;
79 }
80
81 policing[rule->bcast_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
82 512, 1000000);
83 policing[rule->bcast_pol.sharindx].smax = burst;
84
85 /* TODO: support per-flow MTU */
86 policing[rule->bcast_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
87 ETH_FCS_LEN;
88
89 rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
90
91out:
92 if (rc == 0 && new_rule) {
93 priv->flow_block.l2_policer_used[rule->bcast_pol.sharindx] = true;
94 list_add(&rule->list, &priv->flow_block.rules);
95 } else if (new_rule) {
96 kfree(rule);
97 }
98
99 return rc;
100}
101
102static int sja1105_setup_tc_policer(struct sja1105_private *priv,
103 struct netlink_ext_ack *extack,
104 unsigned long cookie, int port, int tc,
105 u64 rate_bytes_per_sec,
106 u32 burst)
107{
108 struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
109 struct sja1105_l2_policing_entry *policing;
110 bool new_rule = false;
111 unsigned long p;
112 int rc;
113
114 if (!rule) {
115 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
116 if (!rule)
117 return -ENOMEM;
118
119 rule->cookie = cookie;
120 rule->type = SJA1105_RULE_TC_POLICER;
121 rule->tc_pol.sharindx = sja1105_find_free_l2_policer(priv);
122 rule->key.type = SJA1105_KEY_TC;
123 rule->key.tc.pcp = tc;
124 new_rule = true;
125 }
126
127 if (rule->tc_pol.sharindx == -1) {
128 NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
129 rc = -ENOSPC;
130 goto out;
131 }
132
133 policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
134
135 if (policing[(port * SJA1105_NUM_TC) + tc].sharindx != port) {
136 NL_SET_ERR_MSG_MOD(extack,
137 "Port-TC pair already has an L2 policer");
138 rc = -EEXIST;
139 goto out;
140 }
141
142 rule->port_mask |= BIT(port);
143
144 /* Make the policers for traffic class @tc of all ports attached to
145 * this block point to the newly allocated policer
146 */
147 for_each_set_bit(p, &rule->port_mask, SJA1105_MAX_NUM_PORTS) {
148 int index = (p * SJA1105_NUM_TC) + tc;
149
150 policing[index].sharindx = rule->tc_pol.sharindx;
151 }
152
153 policing[rule->tc_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
154 512, 1000000);
155 policing[rule->tc_pol.sharindx].smax = burst;
156
157 /* TODO: support per-flow MTU */
158 policing[rule->tc_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
159 ETH_FCS_LEN;
160
161 rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
162
163out:
164 if (rc == 0 && new_rule) {
165 priv->flow_block.l2_policer_used[rule->tc_pol.sharindx] = true;
166 list_add(&rule->list, &priv->flow_block.rules);
167 } else if (new_rule) {
168 kfree(rule);
169 }
170
171 return rc;
172}
173
174static int sja1105_flower_policer(struct sja1105_private *priv, int port,
175 struct netlink_ext_ack *extack,
176 unsigned long cookie,
177 struct sja1105_key *key,
178 u64 rate_bytes_per_sec,
179 u32 burst)
180{
181 switch (key->type) {
182 case SJA1105_KEY_BCAST:
183 return sja1105_setup_bcast_policer(priv, extack, cookie, port,
184 rate_bytes_per_sec, burst);
185 case SJA1105_KEY_TC:
186 return sja1105_setup_tc_policer(priv, extack, cookie, port,
187 key->tc.pcp, rate_bytes_per_sec,
188 burst);
189 default:
190 NL_SET_ERR_MSG_MOD(extack, "Unknown keys for policing");
191 return -EOPNOTSUPP;
192 }
193}
194
195static int sja1105_flower_parse_key(struct sja1105_private *priv,
196 struct netlink_ext_ack *extack,
197 struct flow_cls_offload *cls,
198 struct sja1105_key *key)
199{
200 struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
201 struct flow_dissector *dissector = rule->match.dissector;
202 bool is_bcast_dmac = false;
203 u64 dmac = U64_MAX;
204 u16 vid = U16_MAX;
205 u16 pcp = U16_MAX;
206
207 if (dissector->used_keys &
208 ~(BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
209 BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
210 BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) |
211 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS))) {
212 NL_SET_ERR_MSG_MOD(extack,
213 "Unsupported keys used");
214 return -EOPNOTSUPP;
215 }
216
217 if (flow_rule_match_has_control_flags(rule, extack))
218 return -EOPNOTSUPP;
219
220 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
221 struct flow_match_basic match;
222
223 flow_rule_match_basic(rule, &match);
224 if (match.key->n_proto) {
225 NL_SET_ERR_MSG_MOD(extack,
226 "Matching on protocol not supported");
227 return -EOPNOTSUPP;
228 }
229 }
230
231 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
232 u8 bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
233 u8 null[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
234 struct flow_match_eth_addrs match;
235
236 flow_rule_match_eth_addrs(rule, &match);
237
238 if (!ether_addr_equal_masked(match.key->src, null,
239 match.mask->src)) {
240 NL_SET_ERR_MSG_MOD(extack,
241 "Matching on source MAC not supported");
242 return -EOPNOTSUPP;
243 }
244
245 if (!ether_addr_equal(match.mask->dst, bcast)) {
246 NL_SET_ERR_MSG_MOD(extack,
247 "Masked matching on MAC not supported");
248 return -EOPNOTSUPP;
249 }
250
251 dmac = ether_addr_to_u64(match.key->dst);
252 is_bcast_dmac = ether_addr_equal(match.key->dst, bcast);
253 }
254
255 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
256 struct flow_match_vlan match;
257
258 flow_rule_match_vlan(rule, &match);
259
260 if (match.mask->vlan_id &&
261 match.mask->vlan_id != VLAN_VID_MASK) {
262 NL_SET_ERR_MSG_MOD(extack,
263 "Masked matching on VID is not supported");
264 return -EOPNOTSUPP;
265 }
266
267 if (match.mask->vlan_priority &&
268 match.mask->vlan_priority != 0x7) {
269 NL_SET_ERR_MSG_MOD(extack,
270 "Masked matching on PCP is not supported");
271 return -EOPNOTSUPP;
272 }
273
274 if (match.mask->vlan_id)
275 vid = match.key->vlan_id;
276 if (match.mask->vlan_priority)
277 pcp = match.key->vlan_priority;
278 }
279
280 if (is_bcast_dmac && vid == U16_MAX && pcp == U16_MAX) {
281 key->type = SJA1105_KEY_BCAST;
282 return 0;
283 }
284 if (dmac == U64_MAX && vid == U16_MAX && pcp != U16_MAX) {
285 key->type = SJA1105_KEY_TC;
286 key->tc.pcp = pcp;
287 return 0;
288 }
289 if (dmac != U64_MAX && vid != U16_MAX && pcp != U16_MAX) {
290 key->type = SJA1105_KEY_VLAN_AWARE_VL;
291 key->vl.dmac = dmac;
292 key->vl.vid = vid;
293 key->vl.pcp = pcp;
294 return 0;
295 }
296 if (dmac != U64_MAX) {
297 key->type = SJA1105_KEY_VLAN_UNAWARE_VL;
298 key->vl.dmac = dmac;
299 return 0;
300 }
301
302 NL_SET_ERR_MSG_MOD(extack, "Not matching on any known key");
303 return -EOPNOTSUPP;
304}
305
306static int sja1105_policer_validate(const struct flow_action *action,
307 const struct flow_action_entry *act,
308 struct netlink_ext_ack *extack)
309{
310 if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
311 NL_SET_ERR_MSG_MOD(extack,
312 "Offload not supported when exceed action is not drop");
313 return -EOPNOTSUPP;
314 }
315
316 if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
317 act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
318 NL_SET_ERR_MSG_MOD(extack,
319 "Offload not supported when conform action is not pipe or ok");
320 return -EOPNOTSUPP;
321 }
322
323 if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
324 !flow_action_is_last_entry(action, act)) {
325 NL_SET_ERR_MSG_MOD(extack,
326 "Offload not supported when conform action is ok, but action is not last");
327 return -EOPNOTSUPP;
328 }
329
330 if (act->police.peakrate_bytes_ps ||
331 act->police.avrate || act->police.overhead) {
332 NL_SET_ERR_MSG_MOD(extack,
333 "Offload not supported when peakrate/avrate/overhead is configured");
334 return -EOPNOTSUPP;
335 }
336
337 if (act->police.rate_pkt_ps) {
338 NL_SET_ERR_MSG_MOD(extack,
339 "QoS offload not support packets per second");
340 return -EOPNOTSUPP;
341 }
342
343 return 0;
344}
345
346int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
347 struct flow_cls_offload *cls, bool ingress)
348{
349 struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
350 struct netlink_ext_ack *extack = cls->common.extack;
351 struct sja1105_private *priv = ds->priv;
352 const struct flow_action_entry *act;
353 unsigned long cookie = cls->cookie;
354 bool routing_rule = false;
355 struct sja1105_key key;
356 bool gate_rule = false;
357 bool vl_rule = false;
358 int rc, i;
359
360 rc = sja1105_flower_parse_key(priv, extack, cls, &key);
361 if (rc)
362 return rc;
363
364 flow_action_for_each(i, act, &rule->action) {
365 switch (act->id) {
366 case FLOW_ACTION_POLICE:
367 rc = sja1105_policer_validate(&rule->action, act, extack);
368 if (rc)
369 goto out;
370
371 rc = sja1105_flower_policer(priv, port, extack, cookie,
372 &key,
373 act->police.rate_bytes_ps,
374 act->police.burst);
375 if (rc)
376 goto out;
377 break;
378 case FLOW_ACTION_TRAP: {
379 int cpu = dsa_upstream_port(ds, port);
380
381 routing_rule = true;
382 vl_rule = true;
383
384 rc = sja1105_vl_redirect(priv, port, extack, cookie,
385 &key, BIT(cpu), true);
386 if (rc)
387 goto out;
388 break;
389 }
390 case FLOW_ACTION_REDIRECT: {
391 struct dsa_port *to_dp;
392
393 to_dp = dsa_port_from_netdev(act->dev);
394 if (IS_ERR(to_dp)) {
395 NL_SET_ERR_MSG_MOD(extack,
396 "Destination not a switch port");
397 return -EOPNOTSUPP;
398 }
399
400 routing_rule = true;
401 vl_rule = true;
402
403 rc = sja1105_vl_redirect(priv, port, extack, cookie,
404 &key, BIT(to_dp->index), true);
405 if (rc)
406 goto out;
407 break;
408 }
409 case FLOW_ACTION_DROP:
410 vl_rule = true;
411
412 rc = sja1105_vl_redirect(priv, port, extack, cookie,
413 &key, 0, false);
414 if (rc)
415 goto out;
416 break;
417 case FLOW_ACTION_GATE:
418 gate_rule = true;
419 vl_rule = true;
420
421 rc = sja1105_vl_gate(priv, port, extack, cookie,
422 &key, act->hw_index,
423 act->gate.prio,
424 act->gate.basetime,
425 act->gate.cycletime,
426 act->gate.cycletimeext,
427 act->gate.num_entries,
428 act->gate.entries);
429 if (rc)
430 goto out;
431 break;
432 default:
433 NL_SET_ERR_MSG_MOD(extack,
434 "Action not supported");
435 rc = -EOPNOTSUPP;
436 goto out;
437 }
438 }
439
440 if (vl_rule && !rc) {
441 /* Delay scheduling configuration until DESTPORTS has been
442 * populated by all other actions.
443 */
444 if (gate_rule) {
445 if (!routing_rule) {
446 NL_SET_ERR_MSG_MOD(extack,
447 "Can only offload gate action together with redirect or trap");
448 return -EOPNOTSUPP;
449 }
450 rc = sja1105_init_scheduling(priv);
451 if (rc)
452 goto out;
453 }
454
455 rc = sja1105_static_config_reload(priv, SJA1105_VIRTUAL_LINKS);
456 }
457
458out:
459 return rc;
460}
461
462int sja1105_cls_flower_del(struct dsa_switch *ds, int port,
463 struct flow_cls_offload *cls, bool ingress)
464{
465 struct sja1105_private *priv = ds->priv;
466 struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
467 struct sja1105_l2_policing_entry *policing;
468 int old_sharindx;
469
470 if (!rule)
471 return 0;
472
473 if (rule->type == SJA1105_RULE_VL)
474 return sja1105_vl_delete(priv, port, rule, cls->common.extack);
475
476 policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
477
478 if (rule->type == SJA1105_RULE_BCAST_POLICER) {
479 int bcast = (ds->num_ports * SJA1105_NUM_TC) + port;
480
481 old_sharindx = policing[bcast].sharindx;
482 policing[bcast].sharindx = port;
483 } else if (rule->type == SJA1105_RULE_TC_POLICER) {
484 int index = (port * SJA1105_NUM_TC) + rule->key.tc.pcp;
485
486 old_sharindx = policing[index].sharindx;
487 policing[index].sharindx = port;
488 } else {
489 return -EINVAL;
490 }
491
492 rule->port_mask &= ~BIT(port);
493 if (!rule->port_mask) {
494 priv->flow_block.l2_policer_used[old_sharindx] = false;
495 list_del(&rule->list);
496 kfree(rule);
497 }
498
499 return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
500}
501
502int sja1105_cls_flower_stats(struct dsa_switch *ds, int port,
503 struct flow_cls_offload *cls, bool ingress)
504{
505 struct sja1105_private *priv = ds->priv;
506 struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
507 int rc;
508
509 if (!rule)
510 return 0;
511
512 if (rule->type != SJA1105_RULE_VL)
513 return 0;
514
515 rc = sja1105_vl_stats(priv, port, rule, &cls->stats,
516 cls->common.extack);
517 if (rc)
518 return rc;
519
520 return 0;
521}
522
523void sja1105_flower_setup(struct dsa_switch *ds)
524{
525 struct sja1105_private *priv = ds->priv;
526 int port;
527
528 INIT_LIST_HEAD(&priv->flow_block.rules);
529
530 for (port = 0; port < ds->num_ports; port++)
531 priv->flow_block.l2_policer_used[port] = true;
532}
533
534void sja1105_flower_teardown(struct dsa_switch *ds)
535{
536 struct sja1105_private *priv = ds->priv;
537 struct sja1105_rule *rule;
538 struct list_head *pos, *n;
539
540 list_for_each_safe(pos, n, &priv->flow_block.rules) {
541 rule = list_entry(pos, struct sja1105_rule, list);
542 list_del(&rule->list);
543 kfree(rule);
544 }
545}