1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2020 NXP
3  */
4 #include "sja1105.h"
5 #include "sja1105_vl.h"
6 
sja1105_rule_find(struct sja1105_private * priv,unsigned long cookie)7 struct 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 
sja1105_find_free_l2_policer(struct sja1105_private * priv)19 static 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 
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)30 static 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 
91 out:
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 
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)102 static 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 
163 out:
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 
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)174 static 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 
sja1105_flower_parse_key(struct sja1105_private * priv,struct netlink_ext_ack * extack,struct flow_cls_offload * cls,struct sja1105_key * key)195 static 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(FLOW_DISSECTOR_KEY_BASIC) |
209 	      BIT(FLOW_DISSECTOR_KEY_CONTROL) |
210 	      BIT(FLOW_DISSECTOR_KEY_VLAN) |
211 	      BIT(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_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
218 		struct flow_match_basic match;
219 
220 		flow_rule_match_basic(rule, &match);
221 		if (match.key->n_proto) {
222 			NL_SET_ERR_MSG_MOD(extack,
223 					   "Matching on protocol not supported");
224 			return -EOPNOTSUPP;
225 		}
226 	}
227 
228 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
229 		u8 bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
230 		u8 null[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
231 		struct flow_match_eth_addrs match;
232 
233 		flow_rule_match_eth_addrs(rule, &match);
234 
235 		if (!ether_addr_equal_masked(match.key->src, null,
236 					     match.mask->src)) {
237 			NL_SET_ERR_MSG_MOD(extack,
238 					   "Matching on source MAC not supported");
239 			return -EOPNOTSUPP;
240 		}
241 
242 		if (!ether_addr_equal(match.mask->dst, bcast)) {
243 			NL_SET_ERR_MSG_MOD(extack,
244 					   "Masked matching on MAC not supported");
245 			return -EOPNOTSUPP;
246 		}
247 
248 		dmac = ether_addr_to_u64(match.key->dst);
249 		is_bcast_dmac = ether_addr_equal(match.key->dst, bcast);
250 	}
251 
252 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
253 		struct flow_match_vlan match;
254 
255 		flow_rule_match_vlan(rule, &match);
256 
257 		if (match.mask->vlan_id &&
258 		    match.mask->vlan_id != VLAN_VID_MASK) {
259 			NL_SET_ERR_MSG_MOD(extack,
260 					   "Masked matching on VID is not supported");
261 			return -EOPNOTSUPP;
262 		}
263 
264 		if (match.mask->vlan_priority &&
265 		    match.mask->vlan_priority != 0x7) {
266 			NL_SET_ERR_MSG_MOD(extack,
267 					   "Masked matching on PCP is not supported");
268 			return -EOPNOTSUPP;
269 		}
270 
271 		if (match.mask->vlan_id)
272 			vid = match.key->vlan_id;
273 		if (match.mask->vlan_priority)
274 			pcp = match.key->vlan_priority;
275 	}
276 
277 	if (is_bcast_dmac && vid == U16_MAX && pcp == U16_MAX) {
278 		key->type = SJA1105_KEY_BCAST;
279 		return 0;
280 	}
281 	if (dmac == U64_MAX && vid == U16_MAX && pcp != U16_MAX) {
282 		key->type = SJA1105_KEY_TC;
283 		key->tc.pcp = pcp;
284 		return 0;
285 	}
286 	if (dmac != U64_MAX && vid != U16_MAX && pcp != U16_MAX) {
287 		key->type = SJA1105_KEY_VLAN_AWARE_VL;
288 		key->vl.dmac = dmac;
289 		key->vl.vid = vid;
290 		key->vl.pcp = pcp;
291 		return 0;
292 	}
293 	if (dmac != U64_MAX) {
294 		key->type = SJA1105_KEY_VLAN_UNAWARE_VL;
295 		key->vl.dmac = dmac;
296 		return 0;
297 	}
298 
299 	NL_SET_ERR_MSG_MOD(extack, "Not matching on any known key");
300 	return -EOPNOTSUPP;
301 }
302 
sja1105_cls_flower_add(struct dsa_switch * ds,int port,struct flow_cls_offload * cls,bool ingress)303 int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
304 			   struct flow_cls_offload *cls, bool ingress)
305 {
306 	struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
307 	struct netlink_ext_ack *extack = cls->common.extack;
308 	struct sja1105_private *priv = ds->priv;
309 	const struct flow_action_entry *act;
310 	unsigned long cookie = cls->cookie;
311 	bool routing_rule = false;
312 	struct sja1105_key key;
313 	bool gate_rule = false;
314 	bool vl_rule = false;
315 	int rc, i;
316 
317 	rc = sja1105_flower_parse_key(priv, extack, cls, &key);
318 	if (rc)
319 		return rc;
320 
321 	flow_action_for_each(i, act, &rule->action) {
322 		switch (act->id) {
323 		case FLOW_ACTION_POLICE:
324 			if (act->police.rate_pkt_ps) {
325 				NL_SET_ERR_MSG_MOD(extack,
326 						   "QoS offload not support packets per second");
327 				rc = -EOPNOTSUPP;
328 				goto out;
329 			}
330 
331 			rc = sja1105_flower_policer(priv, port, extack, cookie,
332 						    &key,
333 						    act->police.rate_bytes_ps,
334 						    act->police.burst);
335 			if (rc)
336 				goto out;
337 			break;
338 		case FLOW_ACTION_TRAP: {
339 			int cpu = dsa_upstream_port(ds, port);
340 
341 			routing_rule = true;
342 			vl_rule = true;
343 
344 			rc = sja1105_vl_redirect(priv, port, extack, cookie,
345 						 &key, BIT(cpu), true);
346 			if (rc)
347 				goto out;
348 			break;
349 		}
350 		case FLOW_ACTION_REDIRECT: {
351 			struct dsa_port *to_dp;
352 
353 			to_dp = dsa_port_from_netdev(act->dev);
354 			if (IS_ERR(to_dp)) {
355 				NL_SET_ERR_MSG_MOD(extack,
356 						   "Destination not a switch port");
357 				return -EOPNOTSUPP;
358 			}
359 
360 			routing_rule = true;
361 			vl_rule = true;
362 
363 			rc = sja1105_vl_redirect(priv, port, extack, cookie,
364 						 &key, BIT(to_dp->index), true);
365 			if (rc)
366 				goto out;
367 			break;
368 		}
369 		case FLOW_ACTION_DROP:
370 			vl_rule = true;
371 
372 			rc = sja1105_vl_redirect(priv, port, extack, cookie,
373 						 &key, 0, false);
374 			if (rc)
375 				goto out;
376 			break;
377 		case FLOW_ACTION_GATE:
378 			gate_rule = true;
379 			vl_rule = true;
380 
381 			rc = sja1105_vl_gate(priv, port, extack, cookie,
382 					     &key, act->gate.index,
383 					     act->gate.prio,
384 					     act->gate.basetime,
385 					     act->gate.cycletime,
386 					     act->gate.cycletimeext,
387 					     act->gate.num_entries,
388 					     act->gate.entries);
389 			if (rc)
390 				goto out;
391 			break;
392 		default:
393 			NL_SET_ERR_MSG_MOD(extack,
394 					   "Action not supported");
395 			rc = -EOPNOTSUPP;
396 			goto out;
397 		}
398 	}
399 
400 	if (vl_rule && !rc) {
401 		/* Delay scheduling configuration until DESTPORTS has been
402 		 * populated by all other actions.
403 		 */
404 		if (gate_rule) {
405 			if (!routing_rule) {
406 				NL_SET_ERR_MSG_MOD(extack,
407 						   "Can only offload gate action together with redirect or trap");
408 				return -EOPNOTSUPP;
409 			}
410 			rc = sja1105_init_scheduling(priv);
411 			if (rc)
412 				goto out;
413 		}
414 
415 		rc = sja1105_static_config_reload(priv, SJA1105_VIRTUAL_LINKS);
416 	}
417 
418 out:
419 	return rc;
420 }
421 
sja1105_cls_flower_del(struct dsa_switch * ds,int port,struct flow_cls_offload * cls,bool ingress)422 int sja1105_cls_flower_del(struct dsa_switch *ds, int port,
423 			   struct flow_cls_offload *cls, bool ingress)
424 {
425 	struct sja1105_private *priv = ds->priv;
426 	struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
427 	struct sja1105_l2_policing_entry *policing;
428 	int old_sharindx;
429 
430 	if (!rule)
431 		return 0;
432 
433 	if (rule->type == SJA1105_RULE_VL)
434 		return sja1105_vl_delete(priv, port, rule, cls->common.extack);
435 
436 	policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
437 
438 	if (rule->type == SJA1105_RULE_BCAST_POLICER) {
439 		int bcast = (ds->num_ports * SJA1105_NUM_TC) + port;
440 
441 		old_sharindx = policing[bcast].sharindx;
442 		policing[bcast].sharindx = port;
443 	} else if (rule->type == SJA1105_RULE_TC_POLICER) {
444 		int index = (port * SJA1105_NUM_TC) + rule->key.tc.pcp;
445 
446 		old_sharindx = policing[index].sharindx;
447 		policing[index].sharindx = port;
448 	} else {
449 		return -EINVAL;
450 	}
451 
452 	rule->port_mask &= ~BIT(port);
453 	if (!rule->port_mask) {
454 		priv->flow_block.l2_policer_used[old_sharindx] = false;
455 		list_del(&rule->list);
456 		kfree(rule);
457 	}
458 
459 	return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
460 }
461 
sja1105_cls_flower_stats(struct dsa_switch * ds,int port,struct flow_cls_offload * cls,bool ingress)462 int sja1105_cls_flower_stats(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 	int rc;
468 
469 	if (!rule)
470 		return 0;
471 
472 	if (rule->type != SJA1105_RULE_VL)
473 		return 0;
474 
475 	rc = sja1105_vl_stats(priv, port, rule, &cls->stats,
476 			      cls->common.extack);
477 	if (rc)
478 		return rc;
479 
480 	return 0;
481 }
482 
sja1105_flower_setup(struct dsa_switch * ds)483 void sja1105_flower_setup(struct dsa_switch *ds)
484 {
485 	struct sja1105_private *priv = ds->priv;
486 	int port;
487 
488 	INIT_LIST_HEAD(&priv->flow_block.rules);
489 
490 	for (port = 0; port < ds->num_ports; port++)
491 		priv->flow_block.l2_policer_used[port] = true;
492 }
493 
sja1105_flower_teardown(struct dsa_switch * ds)494 void sja1105_flower_teardown(struct dsa_switch *ds)
495 {
496 	struct sja1105_private *priv = ds->priv;
497 	struct sja1105_rule *rule;
498 	struct list_head *pos, *n;
499 
500 	list_for_each_safe(pos, n, &priv->flow_block.rules) {
501 		rule = list_entry(pos, struct sja1105_rule, list);
502 		list_del(&rule->list);
503 		kfree(rule);
504 	}
505 }
506