1// SPDX-License-Identifier: (GPL-2.0 OR MIT)
2/* Microsemi Ocelot Switch driver
3 * Copyright (c) 2019 Microsemi Corporation
4 */
5
6#include <net/pkt_cls.h>
7#include <net/tc_act/tc_gact.h>
8#include <soc/mscc/ocelot_vcap.h>
9#include "ocelot_police.h"
10#include "ocelot_vcap.h"
11
12/* Arbitrarily chosen constants for encoding the VCAP block and lookup number
13 * into the chain number. This is UAPI.
14 */
15#define VCAP_BLOCK 10000
16#define VCAP_LOOKUP 1000
17#define VCAP_IS1_NUM_LOOKUPS 3
18#define VCAP_IS2_NUM_LOOKUPS 2
19#define VCAP_IS2_NUM_PAG 256
20#define VCAP_IS1_CHAIN(lookup) \
21 (1 * VCAP_BLOCK + (lookup) * VCAP_LOOKUP)
22#define VCAP_IS2_CHAIN(lookup, pag) \
23 (2 * VCAP_BLOCK + (lookup) * VCAP_LOOKUP + (pag))
24/* PSFP chain and block ID */
25#define PSFP_BLOCK_ID OCELOT_NUM_VCAP_BLOCKS
26#define OCELOT_PSFP_CHAIN (3 * VCAP_BLOCK)
27
28static int ocelot_chain_to_block(int chain, bool ingress)
29{
30 int lookup, pag;
31
32 if (!ingress) {
33 if (chain == 0)
34 return VCAP_ES0;
35 return -EOPNOTSUPP;
36 }
37
38 /* Backwards compatibility with older, single-chain tc-flower
39 * offload support in Ocelot
40 */
41 if (chain == 0)
42 return VCAP_IS2;
43
44 for (lookup = 0; lookup < VCAP_IS1_NUM_LOOKUPS; lookup++)
45 if (chain == VCAP_IS1_CHAIN(lookup))
46 return VCAP_IS1;
47
48 for (lookup = 0; lookup < VCAP_IS2_NUM_LOOKUPS; lookup++)
49 for (pag = 0; pag < VCAP_IS2_NUM_PAG; pag++)
50 if (chain == VCAP_IS2_CHAIN(lookup, pag))
51 return VCAP_IS2;
52
53 if (chain == OCELOT_PSFP_CHAIN)
54 return PSFP_BLOCK_ID;
55
56 return -EOPNOTSUPP;
57}
58
59/* Caller must ensure this is a valid IS1 or IS2 chain first,
60 * by calling ocelot_chain_to_block.
61 */
62static int ocelot_chain_to_lookup(int chain)
63{
64 /* Backwards compatibility with older, single-chain tc-flower
65 * offload support in Ocelot
66 */
67 if (chain == 0)
68 return 0;
69
70 return (chain / VCAP_LOOKUP) % 10;
71}
72
73/* Caller must ensure this is a valid IS2 chain first,
74 * by calling ocelot_chain_to_block.
75 */
76static int ocelot_chain_to_pag(int chain)
77{
78 int lookup;
79
80 /* Backwards compatibility with older, single-chain tc-flower
81 * offload support in Ocelot
82 */
83 if (chain == 0)
84 return 0;
85
86 lookup = ocelot_chain_to_lookup(chain);
87
88 /* calculate PAG value as chain index relative to the first PAG */
89 return chain - VCAP_IS2_CHAIN(lookup, 0);
90}
91
92static bool ocelot_is_goto_target_valid(int goto_target, int chain,
93 bool ingress)
94{
95 int pag;
96
97 /* Can't offload GOTO in VCAP ES0 */
98 if (!ingress)
99 return (goto_target < 0);
100
101 /* Non-optional GOTOs */
102 if (chain == 0)
103 /* VCAP IS1 can be skipped, either partially or completely */
104 return (goto_target == VCAP_IS1_CHAIN(0) ||
105 goto_target == VCAP_IS1_CHAIN(1) ||
106 goto_target == VCAP_IS1_CHAIN(2) ||
107 goto_target == VCAP_IS2_CHAIN(0, 0) ||
108 goto_target == VCAP_IS2_CHAIN(1, 0) ||
109 goto_target == OCELOT_PSFP_CHAIN);
110
111 if (chain == VCAP_IS1_CHAIN(0))
112 return (goto_target == VCAP_IS1_CHAIN(1));
113
114 if (chain == VCAP_IS1_CHAIN(1))
115 return (goto_target == VCAP_IS1_CHAIN(2));
116
117 /* Lookup 2 of VCAP IS1 can really support non-optional GOTOs,
118 * using a Policy Association Group (PAG) value, which is an 8-bit
119 * value encoding a VCAP IS2 target chain.
120 */
121 if (chain == VCAP_IS1_CHAIN(2)) {
122 for (pag = 0; pag < VCAP_IS2_NUM_PAG; pag++)
123 if (goto_target == VCAP_IS2_CHAIN(0, pag))
124 return true;
125
126 return false;
127 }
128
129 /* Non-optional GOTO from VCAP IS2 lookup 0 to lookup 1.
130 * We cannot change the PAG at this point.
131 */
132 for (pag = 0; pag < VCAP_IS2_NUM_PAG; pag++)
133 if (chain == VCAP_IS2_CHAIN(0, pag))
134 return (goto_target == VCAP_IS2_CHAIN(1, pag));
135
136 /* VCAP IS2 lookup 1 can goto to PSFP block if hardware support */
137 for (pag = 0; pag < VCAP_IS2_NUM_PAG; pag++)
138 if (chain == VCAP_IS2_CHAIN(1, pag))
139 return (goto_target == OCELOT_PSFP_CHAIN);
140
141 return false;
142}
143
144static struct ocelot_vcap_filter *
145ocelot_find_vcap_filter_that_points_at(struct ocelot *ocelot, int chain)
146{
147 struct ocelot_vcap_filter *filter;
148 struct ocelot_vcap_block *block;
149 int block_id;
150
151 block_id = ocelot_chain_to_block(chain, ingress: true);
152 if (block_id < 0)
153 return NULL;
154
155 if (block_id == VCAP_IS2) {
156 block = &ocelot->block[VCAP_IS1];
157
158 list_for_each_entry(filter, &block->rules, list)
159 if (filter->type == OCELOT_VCAP_FILTER_PAG &&
160 filter->goto_target == chain)
161 return filter;
162 }
163
164 list_for_each_entry(filter, &ocelot->dummy_rules, list)
165 if (filter->goto_target == chain)
166 return filter;
167
168 return NULL;
169}
170
171static int
172ocelot_flower_parse_ingress_vlan_modify(struct ocelot *ocelot, int port,
173 struct ocelot_vcap_filter *filter,
174 const struct flow_action_entry *a,
175 struct netlink_ext_ack *extack)
176{
177 struct ocelot_port *ocelot_port = ocelot->ports[port];
178
179 if (filter->goto_target != -1) {
180 NL_SET_ERR_MSG_MOD(extack,
181 "Last action must be GOTO");
182 return -EOPNOTSUPP;
183 }
184
185 if (!ocelot_port->vlan_aware) {
186 NL_SET_ERR_MSG_MOD(extack,
187 "Can only modify VLAN under VLAN aware bridge");
188 return -EOPNOTSUPP;
189 }
190
191 filter->action.vid_replace_ena = true;
192 filter->action.pcp_dei_ena = true;
193 filter->action.vid = a->vlan.vid;
194 filter->action.pcp = a->vlan.prio;
195 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
196
197 return 0;
198}
199
200static int
201ocelot_flower_parse_egress_vlan_modify(struct ocelot_vcap_filter *filter,
202 const struct flow_action_entry *a,
203 struct netlink_ext_ack *extack)
204{
205 enum ocelot_tag_tpid_sel tpid;
206
207 switch (ntohs(a->vlan.proto)) {
208 case ETH_P_8021Q:
209 tpid = OCELOT_TAG_TPID_SEL_8021Q;
210 break;
211 case ETH_P_8021AD:
212 tpid = OCELOT_TAG_TPID_SEL_8021AD;
213 break;
214 default:
215 NL_SET_ERR_MSG_MOD(extack,
216 "Cannot modify custom TPID");
217 return -EOPNOTSUPP;
218 }
219
220 filter->action.tag_a_tpid_sel = tpid;
221 filter->action.push_outer_tag = OCELOT_ES0_TAG;
222 filter->action.tag_a_vid_sel = OCELOT_ES0_VID_PLUS_CLASSIFIED_VID;
223 filter->action.vid_a_val = a->vlan.vid;
224 filter->action.pcp_a_val = a->vlan.prio;
225 filter->action.tag_a_pcp_sel = OCELOT_ES0_PCP;
226 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
227
228 return 0;
229}
230
231static int ocelot_flower_parse_action(struct ocelot *ocelot, int port,
232 bool ingress, struct flow_cls_offload *f,
233 struct ocelot_vcap_filter *filter)
234{
235 const struct flow_action *action = &f->rule->action;
236 struct netlink_ext_ack *extack = f->common.extack;
237 bool allow_missing_goto_target = false;
238 const struct flow_action_entry *a;
239 enum ocelot_tag_tpid_sel tpid;
240 int i, chain, egress_port;
241 u32 pol_ix, pol_max;
242 u64 rate;
243 int err;
244
245 if (!flow_action_basic_hw_stats_check(action: &f->rule->action,
246 extack: f->common.extack))
247 return -EOPNOTSUPP;
248
249 chain = f->common.chain_index;
250 filter->block_id = ocelot_chain_to_block(chain, ingress);
251 if (filter->block_id < 0) {
252 NL_SET_ERR_MSG_MOD(extack, "Cannot offload to this chain");
253 return -EOPNOTSUPP;
254 }
255 if (filter->block_id == VCAP_IS1 || filter->block_id == VCAP_IS2)
256 filter->lookup = ocelot_chain_to_lookup(chain);
257 if (filter->block_id == VCAP_IS2)
258 filter->pag = ocelot_chain_to_pag(chain);
259
260 filter->goto_target = -1;
261 filter->type = OCELOT_VCAP_FILTER_DUMMY;
262
263 flow_action_for_each(i, a, action) {
264 switch (a->id) {
265 case FLOW_ACTION_DROP:
266 if (filter->block_id != VCAP_IS2) {
267 NL_SET_ERR_MSG_MOD(extack,
268 "Drop action can only be offloaded to VCAP IS2");
269 return -EOPNOTSUPP;
270 }
271 if (filter->goto_target != -1) {
272 NL_SET_ERR_MSG_MOD(extack,
273 "Last action must be GOTO");
274 return -EOPNOTSUPP;
275 }
276 filter->action.mask_mode = OCELOT_MASK_MODE_PERMIT_DENY;
277 filter->action.port_mask = 0;
278 filter->action.police_ena = true;
279 filter->action.pol_ix = OCELOT_POLICER_DISCARD;
280 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
281 break;
282 case FLOW_ACTION_ACCEPT:
283 if (filter->block_id != VCAP_ES0 &&
284 filter->block_id != VCAP_IS1 &&
285 filter->block_id != VCAP_IS2) {
286 NL_SET_ERR_MSG_MOD(extack,
287 "Accept action can only be offloaded to VCAP chains");
288 return -EOPNOTSUPP;
289 }
290 if (filter->block_id != VCAP_ES0 &&
291 filter->goto_target != -1) {
292 NL_SET_ERR_MSG_MOD(extack,
293 "Last action must be GOTO");
294 return -EOPNOTSUPP;
295 }
296 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
297 break;
298 case FLOW_ACTION_TRAP:
299 if (filter->block_id != VCAP_IS2 ||
300 filter->lookup != 0) {
301 NL_SET_ERR_MSG_MOD(extack,
302 "Trap action can only be offloaded to VCAP IS2 lookup 0");
303 return -EOPNOTSUPP;
304 }
305 if (filter->goto_target != -1) {
306 NL_SET_ERR_MSG_MOD(extack,
307 "Last action must be GOTO");
308 return -EOPNOTSUPP;
309 }
310 filter->action.mask_mode = OCELOT_MASK_MODE_PERMIT_DENY;
311 filter->action.port_mask = 0;
312 filter->action.cpu_copy_ena = true;
313 filter->action.cpu_qu_num = 0;
314 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
315 filter->is_trap = true;
316 break;
317 case FLOW_ACTION_POLICE:
318 if (filter->block_id == PSFP_BLOCK_ID) {
319 filter->type = OCELOT_PSFP_FILTER_OFFLOAD;
320 break;
321 }
322 if (filter->block_id != VCAP_IS2 ||
323 filter->lookup != 0) {
324 NL_SET_ERR_MSG_MOD(extack,
325 "Police action can only be offloaded to VCAP IS2 lookup 0 or PSFP");
326 return -EOPNOTSUPP;
327 }
328 if (filter->goto_target != -1) {
329 NL_SET_ERR_MSG_MOD(extack,
330 "Last action must be GOTO");
331 return -EOPNOTSUPP;
332 }
333
334 err = ocelot_policer_validate(action, a, extack);
335 if (err)
336 return err;
337
338 filter->action.police_ena = true;
339
340 pol_ix = a->hw_index + ocelot->vcap_pol.base;
341 pol_max = ocelot->vcap_pol.max;
342
343 if (ocelot->vcap_pol.max2 && pol_ix > pol_max) {
344 pol_ix += ocelot->vcap_pol.base2 - pol_max - 1;
345 pol_max = ocelot->vcap_pol.max2;
346 }
347
348 if (pol_ix >= pol_max)
349 return -EINVAL;
350
351 filter->action.pol_ix = pol_ix;
352
353 rate = a->police.rate_bytes_ps;
354 filter->action.pol.rate = div_u64(dividend: rate, divisor: 1000) * 8;
355 filter->action.pol.burst = a->police.burst;
356 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
357 break;
358 case FLOW_ACTION_REDIRECT:
359 if (filter->block_id != VCAP_IS2) {
360 NL_SET_ERR_MSG_MOD(extack,
361 "Redirect action can only be offloaded to VCAP IS2");
362 return -EOPNOTSUPP;
363 }
364 if (filter->goto_target != -1) {
365 NL_SET_ERR_MSG_MOD(extack,
366 "Last action must be GOTO");
367 return -EOPNOTSUPP;
368 }
369 egress_port = ocelot->ops->netdev_to_port(a->dev);
370 if (egress_port < 0) {
371 NL_SET_ERR_MSG_MOD(extack,
372 "Destination not an ocelot port");
373 return -EOPNOTSUPP;
374 }
375 filter->action.mask_mode = OCELOT_MASK_MODE_REDIRECT;
376 filter->action.port_mask = BIT(egress_port);
377 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
378 break;
379 case FLOW_ACTION_MIRRED:
380 if (filter->block_id != VCAP_IS2) {
381 NL_SET_ERR_MSG_MOD(extack,
382 "Mirror action can only be offloaded to VCAP IS2");
383 return -EOPNOTSUPP;
384 }
385 if (filter->goto_target != -1) {
386 NL_SET_ERR_MSG_MOD(extack,
387 "Last action must be GOTO");
388 return -EOPNOTSUPP;
389 }
390 egress_port = ocelot->ops->netdev_to_port(a->dev);
391 if (egress_port < 0) {
392 NL_SET_ERR_MSG_MOD(extack,
393 "Destination not an ocelot port");
394 return -EOPNOTSUPP;
395 }
396 filter->egress_port.value = egress_port;
397 filter->action.mirror_ena = true;
398 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
399 break;
400 case FLOW_ACTION_VLAN_POP:
401 if (filter->block_id != VCAP_IS1) {
402 NL_SET_ERR_MSG_MOD(extack,
403 "VLAN pop action can only be offloaded to VCAP IS1");
404 return -EOPNOTSUPP;
405 }
406 if (filter->goto_target != -1) {
407 NL_SET_ERR_MSG_MOD(extack,
408 "Last action must be GOTO");
409 return -EOPNOTSUPP;
410 }
411 filter->action.vlan_pop_cnt_ena = true;
412 filter->action.vlan_pop_cnt++;
413 if (filter->action.vlan_pop_cnt > 2) {
414 NL_SET_ERR_MSG_MOD(extack,
415 "Cannot pop more than 2 VLAN headers");
416 return -EOPNOTSUPP;
417 }
418 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
419 break;
420 case FLOW_ACTION_VLAN_MANGLE:
421 if (filter->block_id == VCAP_IS1) {
422 err = ocelot_flower_parse_ingress_vlan_modify(ocelot, port,
423 filter, a,
424 extack);
425 } else if (filter->block_id == VCAP_ES0) {
426 err = ocelot_flower_parse_egress_vlan_modify(filter, a,
427 extack);
428 } else {
429 NL_SET_ERR_MSG_MOD(extack,
430 "VLAN modify action can only be offloaded to VCAP IS1 or ES0");
431 err = -EOPNOTSUPP;
432 }
433 if (err)
434 return err;
435 break;
436 case FLOW_ACTION_PRIORITY:
437 if (filter->block_id != VCAP_IS1) {
438 NL_SET_ERR_MSG_MOD(extack,
439 "Priority action can only be offloaded to VCAP IS1");
440 return -EOPNOTSUPP;
441 }
442 if (filter->goto_target != -1) {
443 NL_SET_ERR_MSG_MOD(extack,
444 "Last action must be GOTO");
445 return -EOPNOTSUPP;
446 }
447 filter->action.qos_ena = true;
448 filter->action.qos_val = a->priority;
449 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
450 break;
451 case FLOW_ACTION_GOTO:
452 filter->goto_target = a->chain_index;
453
454 if (filter->block_id == VCAP_IS1 && filter->lookup == 2) {
455 int pag = ocelot_chain_to_pag(chain: filter->goto_target);
456
457 filter->action.pag_override_mask = 0xff;
458 filter->action.pag_val = pag;
459 filter->type = OCELOT_VCAP_FILTER_PAG;
460 }
461 break;
462 case FLOW_ACTION_VLAN_PUSH:
463 if (filter->block_id != VCAP_ES0) {
464 NL_SET_ERR_MSG_MOD(extack,
465 "VLAN push action can only be offloaded to VCAP ES0");
466 return -EOPNOTSUPP;
467 }
468 switch (ntohs(a->vlan.proto)) {
469 case ETH_P_8021Q:
470 tpid = OCELOT_TAG_TPID_SEL_8021Q;
471 break;
472 case ETH_P_8021AD:
473 tpid = OCELOT_TAG_TPID_SEL_8021AD;
474 break;
475 default:
476 NL_SET_ERR_MSG_MOD(extack,
477 "Cannot push custom TPID");
478 return -EOPNOTSUPP;
479 }
480 filter->action.tag_a_tpid_sel = tpid;
481 filter->action.push_outer_tag = OCELOT_ES0_TAG;
482 filter->action.tag_a_vid_sel = OCELOT_ES0_VID;
483 filter->action.vid_a_val = a->vlan.vid;
484 filter->action.pcp_a_val = a->vlan.prio;
485 filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
486 break;
487 case FLOW_ACTION_GATE:
488 if (filter->block_id != PSFP_BLOCK_ID) {
489 NL_SET_ERR_MSG_MOD(extack,
490 "Gate action can only be offloaded to PSFP chain");
491 return -EOPNOTSUPP;
492 }
493 filter->type = OCELOT_PSFP_FILTER_OFFLOAD;
494 break;
495 default:
496 NL_SET_ERR_MSG_MOD(extack, "Cannot offload action");
497 return -EOPNOTSUPP;
498 }
499 }
500
501 if (filter->goto_target == -1) {
502 if ((filter->block_id == VCAP_IS2 && filter->lookup == 1) ||
503 chain == 0 || filter->block_id == PSFP_BLOCK_ID) {
504 allow_missing_goto_target = true;
505 } else {
506 NL_SET_ERR_MSG_MOD(extack, "Missing GOTO action");
507 return -EOPNOTSUPP;
508 }
509 }
510
511 if (!ocelot_is_goto_target_valid(goto_target: filter->goto_target, chain, ingress) &&
512 !allow_missing_goto_target) {
513 NL_SET_ERR_MSG_MOD(extack, "Cannot offload this GOTO target");
514 return -EOPNOTSUPP;
515 }
516
517 return 0;
518}
519
520static int ocelot_flower_parse_indev(struct ocelot *ocelot, int port,
521 struct flow_cls_offload *f,
522 struct ocelot_vcap_filter *filter)
523{
524 struct flow_rule *rule = flow_cls_offload_flow_rule(flow_cmd: f);
525 const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
526 int key_length = vcap->keys[VCAP_ES0_IGR_PORT].length;
527 struct netlink_ext_ack *extack = f->common.extack;
528 struct net_device *dev, *indev;
529 struct flow_match_meta match;
530 int ingress_port;
531
532 flow_rule_match_meta(rule, out: &match);
533
534 if (!match.mask->ingress_ifindex)
535 return 0;
536
537 if (match.mask->ingress_ifindex != 0xFFFFFFFF) {
538 NL_SET_ERR_MSG_MOD(extack, "Unsupported ingress ifindex mask");
539 return -EOPNOTSUPP;
540 }
541
542 dev = ocelot->ops->port_to_netdev(ocelot, port);
543 if (!dev)
544 return -EINVAL;
545
546 indev = __dev_get_by_index(net: dev_net(dev), ifindex: match.key->ingress_ifindex);
547 if (!indev) {
548 NL_SET_ERR_MSG_MOD(extack,
549 "Can't find the ingress port to match on");
550 return -ENOENT;
551 }
552
553 ingress_port = ocelot->ops->netdev_to_port(indev);
554 if (ingress_port < 0) {
555 NL_SET_ERR_MSG_MOD(extack,
556 "Can only offload an ocelot ingress port");
557 return -EOPNOTSUPP;
558 }
559 if (ingress_port == port) {
560 NL_SET_ERR_MSG_MOD(extack,
561 "Ingress port is equal to the egress port");
562 return -EINVAL;
563 }
564
565 filter->ingress_port.value = ingress_port;
566 filter->ingress_port.mask = GENMASK(key_length - 1, 0);
567
568 return 0;
569}
570
571static int
572ocelot_flower_parse_key(struct ocelot *ocelot, int port, bool ingress,
573 struct flow_cls_offload *f,
574 struct ocelot_vcap_filter *filter)
575{
576 struct flow_rule *rule = flow_cls_offload_flow_rule(flow_cmd: f);
577 struct flow_dissector *dissector = rule->match.dissector;
578 struct netlink_ext_ack *extack = f->common.extack;
579 u16 proto = ntohs(f->common.protocol);
580 bool match_protocol = true;
581 int ret;
582
583 if (dissector->used_keys &
584 ~(BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
585 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
586 BIT_ULL(FLOW_DISSECTOR_KEY_META) |
587 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
588 BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) |
589 BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
590 BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
591 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS))) {
592 return -EOPNOTSUPP;
593 }
594
595 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_META)) {
596 struct flow_match_meta match;
597
598 flow_rule_match_meta(rule, out: &match);
599 if (match.mask->l2_miss) {
600 NL_SET_ERR_MSG_MOD(extack, "Can't match on \"l2_miss\"");
601 return -EOPNOTSUPP;
602 }
603 }
604
605 /* For VCAP ES0 (egress rewriter) we can match on the ingress port */
606 if (!ingress) {
607 ret = ocelot_flower_parse_indev(ocelot, port, f, filter);
608 if (ret)
609 return ret;
610 }
611
612 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_CONTROL)) {
613 struct flow_match_control match;
614
615 flow_rule_match_control(rule, out: &match);
616 }
617
618 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_VLAN)) {
619 struct flow_match_vlan match;
620
621 flow_rule_match_vlan(rule, out: &match);
622 filter->key_type = OCELOT_VCAP_KEY_ANY;
623 filter->vlan.vid.value = match.key->vlan_id;
624 filter->vlan.vid.mask = match.mask->vlan_id;
625 filter->vlan.pcp.value[0] = match.key->vlan_priority;
626 filter->vlan.pcp.mask[0] = match.mask->vlan_priority;
627 match_protocol = false;
628 }
629
630 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
631 struct flow_match_eth_addrs match;
632
633 if (filter->block_id == VCAP_ES0) {
634 NL_SET_ERR_MSG_MOD(extack,
635 "VCAP ES0 cannot match on MAC address");
636 return -EOPNOTSUPP;
637 }
638
639 /* The hw support mac matches only for MAC_ETYPE key,
640 * therefore if other matches(port, tcp flags, etc) are added
641 * then just bail out
642 */
643 if ((dissector->used_keys &
644 (BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
645 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
646 BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL))) !=
647 (BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
648 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
649 BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL)))
650 return -EOPNOTSUPP;
651
652 flow_rule_match_eth_addrs(rule, out: &match);
653
654 if (filter->block_id == VCAP_IS1 &&
655 !is_zero_ether_addr(addr: match.mask->dst)) {
656 NL_SET_ERR_MSG_MOD(extack,
657 "Key type S1_NORMAL cannot match on destination MAC");
658 return -EOPNOTSUPP;
659 }
660
661 filter->key_type = OCELOT_VCAP_KEY_ETYPE;
662 ether_addr_copy(dst: filter->key.etype.dmac.value,
663 src: match.key->dst);
664 ether_addr_copy(dst: filter->key.etype.smac.value,
665 src: match.key->src);
666 ether_addr_copy(dst: filter->key.etype.dmac.mask,
667 src: match.mask->dst);
668 ether_addr_copy(dst: filter->key.etype.smac.mask,
669 src: match.mask->src);
670 goto finished_key_parsing;
671 }
672
673 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_BASIC)) {
674 struct flow_match_basic match;
675
676 flow_rule_match_basic(rule, out: &match);
677 if (ntohs(match.key->n_proto) == ETH_P_IP) {
678 if (filter->block_id == VCAP_ES0) {
679 NL_SET_ERR_MSG_MOD(extack,
680 "VCAP ES0 cannot match on IP protocol");
681 return -EOPNOTSUPP;
682 }
683
684 filter->key_type = OCELOT_VCAP_KEY_IPV4;
685 filter->key.ipv4.proto.value[0] =
686 match.key->ip_proto;
687 filter->key.ipv4.proto.mask[0] =
688 match.mask->ip_proto;
689 match_protocol = false;
690 }
691 if (ntohs(match.key->n_proto) == ETH_P_IPV6) {
692 if (filter->block_id == VCAP_ES0) {
693 NL_SET_ERR_MSG_MOD(extack,
694 "VCAP ES0 cannot match on IP protocol");
695 return -EOPNOTSUPP;
696 }
697
698 filter->key_type = OCELOT_VCAP_KEY_IPV6;
699 filter->key.ipv6.proto.value[0] =
700 match.key->ip_proto;
701 filter->key.ipv6.proto.mask[0] =
702 match.mask->ip_proto;
703 match_protocol = false;
704 }
705 }
706
707 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_IPV4_ADDRS) &&
708 proto == ETH_P_IP) {
709 struct flow_match_ipv4_addrs match;
710 u8 *tmp;
711
712 if (filter->block_id == VCAP_ES0) {
713 NL_SET_ERR_MSG_MOD(extack,
714 "VCAP ES0 cannot match on IP address");
715 return -EOPNOTSUPP;
716 }
717
718 flow_rule_match_ipv4_addrs(rule, out: &match);
719
720 if (filter->block_id == VCAP_IS1 && *(u32 *)&match.mask->dst) {
721 NL_SET_ERR_MSG_MOD(extack,
722 "Key type S1_NORMAL cannot match on destination IP");
723 return -EOPNOTSUPP;
724 }
725
726 tmp = &filter->key.ipv4.sip.value.addr[0];
727 memcpy(tmp, &match.key->src, 4);
728
729 tmp = &filter->key.ipv4.sip.mask.addr[0];
730 memcpy(tmp, &match.mask->src, 4);
731
732 tmp = &filter->key.ipv4.dip.value.addr[0];
733 memcpy(tmp, &match.key->dst, 4);
734
735 tmp = &filter->key.ipv4.dip.mask.addr[0];
736 memcpy(tmp, &match.mask->dst, 4);
737 match_protocol = false;
738 }
739
740 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_IPV6_ADDRS) &&
741 proto == ETH_P_IPV6) {
742 return -EOPNOTSUPP;
743 }
744
745 if (flow_rule_match_key(rule, key: FLOW_DISSECTOR_KEY_PORTS)) {
746 struct flow_match_ports match;
747
748 if (filter->block_id == VCAP_ES0) {
749 NL_SET_ERR_MSG_MOD(extack,
750 "VCAP ES0 cannot match on L4 ports");
751 return -EOPNOTSUPP;
752 }
753
754 flow_rule_match_ports(rule, out: &match);
755 filter->key.ipv4.sport.value = ntohs(match.key->src);
756 filter->key.ipv4.sport.mask = ntohs(match.mask->src);
757 filter->key.ipv4.dport.value = ntohs(match.key->dst);
758 filter->key.ipv4.dport.mask = ntohs(match.mask->dst);
759 match_protocol = false;
760 }
761
762finished_key_parsing:
763 if (match_protocol && proto != ETH_P_ALL) {
764 if (filter->block_id == VCAP_ES0) {
765 NL_SET_ERR_MSG_MOD(extack,
766 "VCAP ES0 cannot match on L2 proto");
767 return -EOPNOTSUPP;
768 }
769
770 /* TODO: support SNAP, LLC etc */
771 if (proto < ETH_P_802_3_MIN)
772 return -EOPNOTSUPP;
773 filter->key_type = OCELOT_VCAP_KEY_ETYPE;
774 *(__be16 *)filter->key.etype.etype.value = htons(proto);
775 *(__be16 *)filter->key.etype.etype.mask = htons(0xffff);
776 }
777 /* else, a filter of type OCELOT_VCAP_KEY_ANY is implicitly added */
778
779 return 0;
780}
781
782static int ocelot_flower_parse(struct ocelot *ocelot, int port, bool ingress,
783 struct flow_cls_offload *f,
784 struct ocelot_vcap_filter *filter)
785{
786 int ret;
787
788 filter->prio = f->common.prio;
789 filter->id.cookie = f->cookie;
790 filter->id.tc_offload = true;
791
792 ret = ocelot_flower_parse_action(ocelot, port, ingress, f, filter);
793 if (ret)
794 return ret;
795
796 /* PSFP filter need to parse key by stream identification function. */
797 if (filter->type == OCELOT_PSFP_FILTER_OFFLOAD)
798 return 0;
799
800 return ocelot_flower_parse_key(ocelot, port, ingress, f, filter);
801}
802
803static struct ocelot_vcap_filter
804*ocelot_vcap_filter_create(struct ocelot *ocelot, int port, bool ingress,
805 struct flow_cls_offload *f)
806{
807 struct ocelot_vcap_filter *filter;
808
809 filter = kzalloc(size: sizeof(*filter), GFP_KERNEL);
810 if (!filter)
811 return NULL;
812
813 if (ingress) {
814 filter->ingress_port_mask = BIT(port);
815 } else {
816 const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
817 int key_length = vcap->keys[VCAP_ES0_EGR_PORT].length;
818
819 filter->egress_port.value = port;
820 filter->egress_port.mask = GENMASK(key_length - 1, 0);
821 }
822
823 return filter;
824}
825
826static int ocelot_vcap_dummy_filter_add(struct ocelot *ocelot,
827 struct ocelot_vcap_filter *filter)
828{
829 list_add(new: &filter->list, head: &ocelot->dummy_rules);
830
831 return 0;
832}
833
834static int ocelot_vcap_dummy_filter_del(struct ocelot *ocelot,
835 struct ocelot_vcap_filter *filter)
836{
837 list_del(entry: &filter->list);
838 kfree(objp: filter);
839
840 return 0;
841}
842
843/* If we have an egress VLAN modification rule, we need to actually write the
844 * delta between the input VLAN (from the key) and the output VLAN (from the
845 * action), but the action was parsed first. So we need to patch the delta into
846 * the action here.
847 */
848static int
849ocelot_flower_patch_es0_vlan_modify(struct ocelot_vcap_filter *filter,
850 struct netlink_ext_ack *extack)
851{
852 if (filter->block_id != VCAP_ES0 ||
853 filter->action.tag_a_vid_sel != OCELOT_ES0_VID_PLUS_CLASSIFIED_VID)
854 return 0;
855
856 if (filter->vlan.vid.mask != VLAN_VID_MASK) {
857 NL_SET_ERR_MSG_MOD(extack,
858 "VCAP ES0 VLAN rewriting needs a full VLAN in the key");
859 return -EOPNOTSUPP;
860 }
861
862 filter->action.vid_a_val -= filter->vlan.vid.value;
863 filter->action.vid_a_val &= VLAN_VID_MASK;
864
865 return 0;
866}
867
868int ocelot_cls_flower_replace(struct ocelot *ocelot, int port,
869 struct flow_cls_offload *f, bool ingress)
870{
871 struct netlink_ext_ack *extack = f->common.extack;
872 struct ocelot_vcap_filter *filter;
873 int chain = f->common.chain_index;
874 int block_id, ret;
875
876 if (chain && !ocelot_find_vcap_filter_that_points_at(ocelot, chain)) {
877 NL_SET_ERR_MSG_MOD(extack, "No default GOTO action points to this chain");
878 return -EOPNOTSUPP;
879 }
880
881 block_id = ocelot_chain_to_block(chain, ingress);
882 if (block_id < 0) {
883 NL_SET_ERR_MSG_MOD(extack, "Cannot offload to this chain");
884 return -EOPNOTSUPP;
885 }
886
887 filter = ocelot_vcap_block_find_filter_by_id(block: &ocelot->block[block_id],
888 cookie: f->cookie, tc_offload: true);
889 if (filter) {
890 /* Filter already exists on other ports */
891 if (!ingress) {
892 NL_SET_ERR_MSG_MOD(extack, "VCAP ES0 does not support shared filters");
893 return -EOPNOTSUPP;
894 }
895
896 filter->ingress_port_mask |= BIT(port);
897
898 return ocelot_vcap_filter_replace(ocelot, filter);
899 }
900
901 /* Filter didn't exist, create it now */
902 filter = ocelot_vcap_filter_create(ocelot, port, ingress, f);
903 if (!filter)
904 return -ENOMEM;
905
906 ret = ocelot_flower_parse(ocelot, port, ingress, f, filter);
907 if (ret) {
908 kfree(objp: filter);
909 return ret;
910 }
911
912 ret = ocelot_flower_patch_es0_vlan_modify(filter, extack);
913 if (ret) {
914 kfree(objp: filter);
915 return ret;
916 }
917
918 /* The non-optional GOTOs for the TCAM skeleton don't need
919 * to be actually offloaded.
920 */
921 if (filter->type == OCELOT_VCAP_FILTER_DUMMY)
922 return ocelot_vcap_dummy_filter_add(ocelot, filter);
923
924 if (filter->type == OCELOT_PSFP_FILTER_OFFLOAD) {
925 kfree(objp: filter);
926 if (ocelot->ops->psfp_filter_add)
927 return ocelot->ops->psfp_filter_add(ocelot, port, f);
928
929 NL_SET_ERR_MSG_MOD(extack, "PSFP chain is not supported in HW");
930 return -EOPNOTSUPP;
931 }
932
933 return ocelot_vcap_filter_add(ocelot, rule: filter, extack: f->common.extack);
934}
935EXPORT_SYMBOL_GPL(ocelot_cls_flower_replace);
936
937int ocelot_cls_flower_destroy(struct ocelot *ocelot, int port,
938 struct flow_cls_offload *f, bool ingress)
939{
940 struct ocelot_vcap_filter *filter;
941 struct ocelot_vcap_block *block;
942 int block_id;
943
944 block_id = ocelot_chain_to_block(chain: f->common.chain_index, ingress);
945 if (block_id < 0)
946 return 0;
947
948 if (block_id == PSFP_BLOCK_ID) {
949 if (ocelot->ops->psfp_filter_del)
950 return ocelot->ops->psfp_filter_del(ocelot, f);
951
952 return -EOPNOTSUPP;
953 }
954
955 block = &ocelot->block[block_id];
956
957 filter = ocelot_vcap_block_find_filter_by_id(block, cookie: f->cookie, tc_offload: true);
958 if (!filter)
959 return 0;
960
961 if (filter->type == OCELOT_VCAP_FILTER_DUMMY)
962 return ocelot_vcap_dummy_filter_del(ocelot, filter);
963
964 if (ingress) {
965 filter->ingress_port_mask &= ~BIT(port);
966 if (filter->ingress_port_mask)
967 return ocelot_vcap_filter_replace(ocelot, filter);
968 }
969
970 return ocelot_vcap_filter_del(ocelot, rule: filter);
971}
972EXPORT_SYMBOL_GPL(ocelot_cls_flower_destroy);
973
974int ocelot_cls_flower_stats(struct ocelot *ocelot, int port,
975 struct flow_cls_offload *f, bool ingress)
976{
977 struct ocelot_vcap_filter *filter;
978 struct ocelot_vcap_block *block;
979 struct flow_stats stats = {0};
980 int block_id, ret;
981
982 block_id = ocelot_chain_to_block(chain: f->common.chain_index, ingress);
983 if (block_id < 0)
984 return 0;
985
986 if (block_id == PSFP_BLOCK_ID) {
987 if (ocelot->ops->psfp_stats_get) {
988 ret = ocelot->ops->psfp_stats_get(ocelot, f, &stats);
989 if (ret)
990 return ret;
991
992 goto stats_update;
993 }
994
995 return -EOPNOTSUPP;
996 }
997
998 block = &ocelot->block[block_id];
999
1000 filter = ocelot_vcap_block_find_filter_by_id(block, cookie: f->cookie, tc_offload: true);
1001 if (!filter || filter->type == OCELOT_VCAP_FILTER_DUMMY)
1002 return 0;
1003
1004 ret = ocelot_vcap_filter_stats_update(ocelot, rule: filter);
1005 if (ret)
1006 return ret;
1007
1008 stats.pkts = filter->stats.pkts;
1009
1010stats_update:
1011 flow_stats_update(flow_stats: &f->stats, bytes: 0x0, pkts: stats.pkts, drops: stats.drops, lastused: 0x0,
1012 used_hw_stats: FLOW_ACTION_HW_STATS_IMMEDIATE);
1013 return 0;
1014}
1015EXPORT_SYMBOL_GPL(ocelot_cls_flower_stats);
1016

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source code of linux/drivers/net/ethernet/mscc/ocelot_flower.c