1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
4 */
5
6 #include <linux/if_ether.h>
7 #include <linux/rhashtable.h>
8 #include <linux/ip.h>
9 #include <linux/ipv6.h>
10 #include <net/flow_offload.h>
11 #include <net/pkt_cls.h>
12 #include <net/dsa.h>
13 #include "mtk_eth_soc.h"
14 #include "mtk_wed.h"
15
16 struct mtk_flow_data {
17 struct ethhdr eth;
18
19 union {
20 struct {
21 __be32 src_addr;
22 __be32 dst_addr;
23 } v4;
24
25 struct {
26 struct in6_addr src_addr;
27 struct in6_addr dst_addr;
28 } v6;
29 };
30
31 __be16 src_port;
32 __be16 dst_port;
33
34 u16 vlan_in;
35
36 struct {
37 u16 id;
38 __be16 proto;
39 u8 num;
40 } vlan;
41 struct {
42 u16 sid;
43 u8 num;
44 } pppoe;
45 };
46
47 static const struct rhashtable_params mtk_flow_ht_params = {
48 .head_offset = offsetof(struct mtk_flow_entry, node),
49 .key_offset = offsetof(struct mtk_flow_entry, cookie),
50 .key_len = sizeof(unsigned long),
51 .automatic_shrinking = true,
52 };
53
54 static int
mtk_flow_set_ipv4_addr(struct mtk_eth * eth,struct mtk_foe_entry * foe,struct mtk_flow_data * data,bool egress)55 mtk_flow_set_ipv4_addr(struct mtk_eth *eth, struct mtk_foe_entry *foe,
56 struct mtk_flow_data *data, bool egress)
57 {
58 return mtk_foe_entry_set_ipv4_tuple(eth, foe, egress,
59 data->v4.src_addr, data->src_port,
60 data->v4.dst_addr, data->dst_port);
61 }
62
63 static int
mtk_flow_set_ipv6_addr(struct mtk_eth * eth,struct mtk_foe_entry * foe,struct mtk_flow_data * data)64 mtk_flow_set_ipv6_addr(struct mtk_eth *eth, struct mtk_foe_entry *foe,
65 struct mtk_flow_data *data)
66 {
67 return mtk_foe_entry_set_ipv6_tuple(eth, foe,
68 data->v6.src_addr.s6_addr32, data->src_port,
69 data->v6.dst_addr.s6_addr32, data->dst_port);
70 }
71
72 static void
mtk_flow_offload_mangle_eth(const struct flow_action_entry * act,void * eth)73 mtk_flow_offload_mangle_eth(const struct flow_action_entry *act, void *eth)
74 {
75 void *dest = eth + act->mangle.offset;
76 const void *src = &act->mangle.val;
77
78 if (act->mangle.offset > 8)
79 return;
80
81 if (act->mangle.mask == 0xffff) {
82 src += 2;
83 dest += 2;
84 }
85
86 memcpy(dest, src, act->mangle.mask ? 2 : 4);
87 }
88
89 static int
mtk_flow_get_wdma_info(struct net_device * dev,const u8 * addr,struct mtk_wdma_info * info)90 mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_info *info)
91 {
92 struct net_device_path_stack stack;
93 struct net_device_path *path;
94 int err;
95
96 if (!dev)
97 return -ENODEV;
98
99 if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED))
100 return -1;
101
102 err = dev_fill_forward_path(dev, addr, &stack);
103 if (err)
104 return err;
105
106 path = &stack.path[stack.num_paths - 1];
107 if (path->type != DEV_PATH_MTK_WDMA)
108 return -1;
109
110 info->wdma_idx = path->mtk_wdma.wdma_idx;
111 info->queue = path->mtk_wdma.queue;
112 info->bss = path->mtk_wdma.bss;
113 info->wcid = path->mtk_wdma.wcid;
114 info->amsdu = path->mtk_wdma.amsdu;
115
116 return 0;
117 }
118
119
120 static int
mtk_flow_mangle_ports(const struct flow_action_entry * act,struct mtk_flow_data * data)121 mtk_flow_mangle_ports(const struct flow_action_entry *act,
122 struct mtk_flow_data *data)
123 {
124 u32 val = ntohl(act->mangle.val);
125
126 switch (act->mangle.offset) {
127 case 0:
128 if (act->mangle.mask == ~htonl(0xffff))
129 data->dst_port = cpu_to_be16(val);
130 else
131 data->src_port = cpu_to_be16(val >> 16);
132 break;
133 case 2:
134 data->dst_port = cpu_to_be16(val);
135 break;
136 default:
137 return -EINVAL;
138 }
139
140 return 0;
141 }
142
143 static int
mtk_flow_mangle_ipv4(const struct flow_action_entry * act,struct mtk_flow_data * data)144 mtk_flow_mangle_ipv4(const struct flow_action_entry *act,
145 struct mtk_flow_data *data)
146 {
147 __be32 *dest;
148
149 switch (act->mangle.offset) {
150 case offsetof(struct iphdr, saddr):
151 dest = &data->v4.src_addr;
152 break;
153 case offsetof(struct iphdr, daddr):
154 dest = &data->v4.dst_addr;
155 break;
156 default:
157 return -EINVAL;
158 }
159
160 memcpy(dest, &act->mangle.val, sizeof(u32));
161
162 return 0;
163 }
164
165 static int
mtk_flow_get_dsa_port(struct net_device ** dev)166 mtk_flow_get_dsa_port(struct net_device **dev)
167 {
168 #if IS_ENABLED(CONFIG_NET_DSA)
169 struct dsa_port *dp;
170
171 dp = dsa_port_from_netdev(*dev);
172 if (IS_ERR(dp))
173 return -ENODEV;
174
175 if (dp->cpu_dp->tag_ops->proto != DSA_TAG_PROTO_MTK)
176 return -ENODEV;
177
178 *dev = dsa_port_to_conduit(dp);
179
180 return dp->index;
181 #else
182 return -ENODEV;
183 #endif
184 }
185
186 static int
mtk_flow_set_output_device(struct mtk_eth * eth,struct mtk_foe_entry * foe,struct net_device * dev,const u8 * dest_mac,int * wed_index)187 mtk_flow_set_output_device(struct mtk_eth *eth, struct mtk_foe_entry *foe,
188 struct net_device *dev, const u8 *dest_mac,
189 int *wed_index)
190 {
191 struct mtk_wdma_info info = {};
192 int pse_port, dsa_port, queue;
193
194 if (mtk_flow_get_wdma_info(dev, dest_mac, &info) == 0) {
195 mtk_foe_entry_set_wdma(eth, foe, info.wdma_idx, info.queue,
196 info.bss, info.wcid, info.amsdu);
197 if (mtk_is_netsys_v2_or_greater(eth)) {
198 switch (info.wdma_idx) {
199 case 0:
200 pse_port = PSE_WDMA0_PORT;
201 break;
202 case 1:
203 pse_port = PSE_WDMA1_PORT;
204 break;
205 case 2:
206 pse_port = PSE_WDMA2_PORT;
207 break;
208 default:
209 return -EINVAL;
210 }
211 } else {
212 pse_port = 3;
213 }
214 *wed_index = info.wdma_idx;
215 goto out;
216 }
217
218 dsa_port = mtk_flow_get_dsa_port(&dev);
219
220 if (dev == eth->netdev[0])
221 pse_port = PSE_GDM1_PORT;
222 else if (dev == eth->netdev[1])
223 pse_port = PSE_GDM2_PORT;
224 else if (dev == eth->netdev[2])
225 pse_port = PSE_GDM3_PORT;
226 else
227 return -EOPNOTSUPP;
228
229 if (dsa_port >= 0) {
230 mtk_foe_entry_set_dsa(eth, foe, dsa_port);
231 queue = 3 + dsa_port;
232 } else {
233 queue = pse_port - 1;
234 }
235 mtk_foe_entry_set_queue(eth, foe, queue);
236
237 out:
238 mtk_foe_entry_set_pse_port(eth, foe, pse_port);
239
240 return 0;
241 }
242
243 static int
mtk_flow_offload_replace(struct mtk_eth * eth,struct flow_cls_offload * f,int ppe_index)244 mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f,
245 int ppe_index)
246 {
247 struct flow_rule *rule = flow_cls_offload_flow_rule(f);
248 struct net_device *idev = NULL, *odev = NULL;
249 struct flow_action_entry *act;
250 struct mtk_flow_data data = {};
251 struct mtk_foe_entry foe;
252 struct mtk_flow_entry *entry;
253 int offload_type = 0;
254 int wed_index = -1;
255 u16 addr_type = 0;
256 u8 l4proto = 0;
257 int err = 0;
258 int i;
259
260 if (rhashtable_lookup(ð->flow_table, &f->cookie, mtk_flow_ht_params))
261 return -EEXIST;
262
263 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META)) {
264 struct flow_match_meta match;
265
266 flow_rule_match_meta(rule, &match);
267 if (mtk_is_netsys_v2_or_greater(eth)) {
268 idev = __dev_get_by_index(&init_net, match.key->ingress_ifindex);
269 if (idev && idev->netdev_ops == eth->netdev[0]->netdev_ops) {
270 struct mtk_mac *mac = netdev_priv(idev);
271
272 if (WARN_ON(mac->ppe_idx >= eth->soc->ppe_num))
273 return -EINVAL;
274
275 ppe_index = mac->ppe_idx;
276 }
277 }
278 } else {
279 return -EOPNOTSUPP;
280 }
281
282 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
283 struct flow_match_control match;
284
285 flow_rule_match_control(rule, &match);
286 addr_type = match.key->addr_type;
287
288 if (flow_rule_has_control_flags(match.mask->flags,
289 f->common.extack))
290 return -EOPNOTSUPP;
291 } else {
292 return -EOPNOTSUPP;
293 }
294
295 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
296 struct flow_match_basic match;
297
298 flow_rule_match_basic(rule, &match);
299 l4proto = match.key->ip_proto;
300 } else {
301 return -EOPNOTSUPP;
302 }
303
304 switch (addr_type) {
305 case 0:
306 offload_type = MTK_PPE_PKT_TYPE_BRIDGE;
307 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
308 struct flow_match_eth_addrs match;
309
310 flow_rule_match_eth_addrs(rule, &match);
311 memcpy(data.eth.h_dest, match.key->dst, ETH_ALEN);
312 memcpy(data.eth.h_source, match.key->src, ETH_ALEN);
313 } else {
314 return -EOPNOTSUPP;
315 }
316
317 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
318 struct flow_match_vlan match;
319
320 flow_rule_match_vlan(rule, &match);
321
322 if (match.key->vlan_tpid != cpu_to_be16(ETH_P_8021Q))
323 return -EOPNOTSUPP;
324
325 data.vlan_in = match.key->vlan_id;
326 }
327 break;
328 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
329 offload_type = MTK_PPE_PKT_TYPE_IPV4_HNAPT;
330 break;
331 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
332 offload_type = MTK_PPE_PKT_TYPE_IPV6_ROUTE_5T;
333 break;
334 default:
335 return -EOPNOTSUPP;
336 }
337
338 flow_action_for_each(i, act, &rule->action) {
339 switch (act->id) {
340 case FLOW_ACTION_MANGLE:
341 if (offload_type == MTK_PPE_PKT_TYPE_BRIDGE)
342 return -EOPNOTSUPP;
343 if (act->mangle.htype == FLOW_ACT_MANGLE_HDR_TYPE_ETH)
344 mtk_flow_offload_mangle_eth(act, &data.eth);
345 break;
346 case FLOW_ACTION_REDIRECT:
347 odev = act->dev;
348 break;
349 case FLOW_ACTION_CSUM:
350 break;
351 case FLOW_ACTION_VLAN_PUSH:
352 if (data.vlan.num == 1 ||
353 act->vlan.proto != htons(ETH_P_8021Q))
354 return -EOPNOTSUPP;
355
356 data.vlan.id = act->vlan.vid;
357 data.vlan.proto = act->vlan.proto;
358 data.vlan.num++;
359 break;
360 case FLOW_ACTION_VLAN_POP:
361 break;
362 case FLOW_ACTION_PPPOE_PUSH:
363 if (data.pppoe.num == 1)
364 return -EOPNOTSUPP;
365
366 data.pppoe.sid = act->pppoe.sid;
367 data.pppoe.num++;
368 break;
369 default:
370 return -EOPNOTSUPP;
371 }
372 }
373
374 if (!is_valid_ether_addr(data.eth.h_source) ||
375 !is_valid_ether_addr(data.eth.h_dest))
376 return -EINVAL;
377
378 err = mtk_foe_entry_prepare(eth, &foe, offload_type, l4proto, 0,
379 data.eth.h_source, data.eth.h_dest);
380 if (err)
381 return err;
382
383 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
384 struct flow_match_ports ports;
385
386 if (offload_type == MTK_PPE_PKT_TYPE_BRIDGE)
387 return -EOPNOTSUPP;
388
389 flow_rule_match_ports(rule, &ports);
390 data.src_port = ports.key->src;
391 data.dst_port = ports.key->dst;
392 } else if (offload_type != MTK_PPE_PKT_TYPE_BRIDGE) {
393 return -EOPNOTSUPP;
394 }
395
396 if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
397 struct flow_match_ipv4_addrs addrs;
398
399 flow_rule_match_ipv4_addrs(rule, &addrs);
400
401 data.v4.src_addr = addrs.key->src;
402 data.v4.dst_addr = addrs.key->dst;
403
404 mtk_flow_set_ipv4_addr(eth, &foe, &data, false);
405 }
406
407 if (addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
408 struct flow_match_ipv6_addrs addrs;
409
410 flow_rule_match_ipv6_addrs(rule, &addrs);
411
412 data.v6.src_addr = addrs.key->src;
413 data.v6.dst_addr = addrs.key->dst;
414
415 mtk_flow_set_ipv6_addr(eth, &foe, &data);
416 }
417
418 flow_action_for_each(i, act, &rule->action) {
419 if (act->id != FLOW_ACTION_MANGLE)
420 continue;
421
422 if (offload_type == MTK_PPE_PKT_TYPE_BRIDGE)
423 return -EOPNOTSUPP;
424
425 switch (act->mangle.htype) {
426 case FLOW_ACT_MANGLE_HDR_TYPE_TCP:
427 case FLOW_ACT_MANGLE_HDR_TYPE_UDP:
428 err = mtk_flow_mangle_ports(act, &data);
429 break;
430 case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
431 err = mtk_flow_mangle_ipv4(act, &data);
432 break;
433 case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
434 /* handled earlier */
435 break;
436 default:
437 return -EOPNOTSUPP;
438 }
439
440 if (err)
441 return err;
442 }
443
444 if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
445 err = mtk_flow_set_ipv4_addr(eth, &foe, &data, true);
446 if (err)
447 return err;
448 }
449
450 if (offload_type == MTK_PPE_PKT_TYPE_BRIDGE)
451 foe.bridge.vlan = data.vlan_in;
452
453 if (data.vlan.num == 1) {
454 if (data.vlan.proto != htons(ETH_P_8021Q))
455 return -EOPNOTSUPP;
456
457 mtk_foe_entry_set_vlan(eth, &foe, data.vlan.id);
458 }
459 if (data.pppoe.num == 1)
460 mtk_foe_entry_set_pppoe(eth, &foe, data.pppoe.sid);
461
462 err = mtk_flow_set_output_device(eth, &foe, odev, data.eth.h_dest,
463 &wed_index);
464 if (err)
465 return err;
466
467 if (wed_index >= 0 && (err = mtk_wed_flow_add(wed_index)) < 0)
468 return err;
469
470 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
471 if (!entry)
472 return -ENOMEM;
473
474 entry->cookie = f->cookie;
475 memcpy(&entry->data, &foe, sizeof(entry->data));
476 entry->wed_index = wed_index;
477 entry->ppe_index = ppe_index;
478
479 err = mtk_foe_entry_commit(eth->ppe[entry->ppe_index], entry);
480 if (err < 0)
481 goto free;
482
483 err = rhashtable_insert_fast(ð->flow_table, &entry->node,
484 mtk_flow_ht_params);
485 if (err < 0)
486 goto clear;
487
488 return 0;
489
490 clear:
491 mtk_foe_entry_clear(eth->ppe[entry->ppe_index], entry);
492 free:
493 kfree(entry);
494 if (wed_index >= 0)
495 mtk_wed_flow_remove(wed_index);
496 return err;
497 }
498
499 static int
mtk_flow_offload_destroy(struct mtk_eth * eth,struct flow_cls_offload * f)500 mtk_flow_offload_destroy(struct mtk_eth *eth, struct flow_cls_offload *f)
501 {
502 struct mtk_flow_entry *entry;
503
504 entry = rhashtable_lookup(ð->flow_table, &f->cookie,
505 mtk_flow_ht_params);
506 if (!entry)
507 return -ENOENT;
508
509 mtk_foe_entry_clear(eth->ppe[entry->ppe_index], entry);
510 rhashtable_remove_fast(ð->flow_table, &entry->node,
511 mtk_flow_ht_params);
512 if (entry->wed_index >= 0)
513 mtk_wed_flow_remove(entry->wed_index);
514 kfree(entry);
515
516 return 0;
517 }
518
519 static int
mtk_flow_offload_stats(struct mtk_eth * eth,struct flow_cls_offload * f)520 mtk_flow_offload_stats(struct mtk_eth *eth, struct flow_cls_offload *f)
521 {
522 struct mtk_flow_entry *entry;
523 struct mtk_foe_accounting diff;
524 u32 idle;
525
526 entry = rhashtable_lookup(ð->flow_table, &f->cookie,
527 mtk_flow_ht_params);
528 if (!entry)
529 return -ENOENT;
530
531 idle = mtk_foe_entry_idle_time(eth->ppe[entry->ppe_index], entry);
532 f->stats.lastused = jiffies - idle * HZ;
533
534 if (entry->hash != 0xFFFF &&
535 mtk_foe_entry_get_mib(eth->ppe[entry->ppe_index], entry->hash,
536 &diff)) {
537 f->stats.pkts += diff.packets;
538 f->stats.bytes += diff.bytes;
539 }
540
541 return 0;
542 }
543
544 static DEFINE_MUTEX(mtk_flow_offload_mutex);
545
mtk_flow_offload_cmd(struct mtk_eth * eth,struct flow_cls_offload * cls,int ppe_index)546 int mtk_flow_offload_cmd(struct mtk_eth *eth, struct flow_cls_offload *cls,
547 int ppe_index)
548 {
549 int err;
550
551 mutex_lock(&mtk_flow_offload_mutex);
552 switch (cls->command) {
553 case FLOW_CLS_REPLACE:
554 err = mtk_flow_offload_replace(eth, cls, ppe_index);
555 break;
556 case FLOW_CLS_DESTROY:
557 err = mtk_flow_offload_destroy(eth, cls);
558 break;
559 case FLOW_CLS_STATS:
560 err = mtk_flow_offload_stats(eth, cls);
561 break;
562 default:
563 err = -EOPNOTSUPP;
564 break;
565 }
566 mutex_unlock(&mtk_flow_offload_mutex);
567
568 return err;
569 }
570
571 static int
mtk_eth_setup_tc_block_cb(enum tc_setup_type type,void * type_data,void * cb_priv)572 mtk_eth_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
573 {
574 struct flow_cls_offload *cls = type_data;
575 struct net_device *dev = cb_priv;
576 struct mtk_mac *mac;
577 struct mtk_eth *eth;
578
579 mac = netdev_priv(dev);
580 eth = mac->hw;
581
582 if (!tc_can_offload(dev))
583 return -EOPNOTSUPP;
584
585 if (type != TC_SETUP_CLSFLOWER)
586 return -EOPNOTSUPP;
587
588 return mtk_flow_offload_cmd(eth, cls, 0);
589 }
590
591 static int
mtk_eth_setup_tc_block(struct net_device * dev,struct flow_block_offload * f)592 mtk_eth_setup_tc_block(struct net_device *dev, struct flow_block_offload *f)
593 {
594 struct mtk_mac *mac = netdev_priv(dev);
595 struct mtk_eth *eth = mac->hw;
596 static LIST_HEAD(block_cb_list);
597 struct flow_block_cb *block_cb;
598 flow_setup_cb_t *cb;
599
600 if (!eth->soc->offload_version)
601 return -EOPNOTSUPP;
602
603 if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
604 return -EOPNOTSUPP;
605
606 cb = mtk_eth_setup_tc_block_cb;
607 f->driver_block_list = &block_cb_list;
608
609 switch (f->command) {
610 case FLOW_BLOCK_BIND:
611 block_cb = flow_block_cb_lookup(f->block, cb, dev);
612 if (block_cb) {
613 flow_block_cb_incref(block_cb);
614 return 0;
615 }
616 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
617 if (IS_ERR(block_cb))
618 return PTR_ERR(block_cb);
619
620 flow_block_cb_incref(block_cb);
621 flow_block_cb_add(block_cb, f);
622 list_add_tail(&block_cb->driver_list, &block_cb_list);
623 return 0;
624 case FLOW_BLOCK_UNBIND:
625 block_cb = flow_block_cb_lookup(f->block, cb, dev);
626 if (!block_cb)
627 return -ENOENT;
628
629 if (!flow_block_cb_decref(block_cb)) {
630 flow_block_cb_remove(block_cb, f);
631 list_del(&block_cb->driver_list);
632 }
633 return 0;
634 default:
635 return -EOPNOTSUPP;
636 }
637 }
638
mtk_eth_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)639 int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
640 void *type_data)
641 {
642 switch (type) {
643 case TC_SETUP_BLOCK:
644 case TC_SETUP_FT:
645 return mtk_eth_setup_tc_block(dev, type_data);
646 default:
647 return -EOPNOTSUPP;
648 }
649 }
650
mtk_eth_offload_init(struct mtk_eth * eth,u8 id)651 int mtk_eth_offload_init(struct mtk_eth *eth, u8 id)
652 {
653 if (!eth->ppe[id] || !eth->ppe[id]->foe_table)
654 return 0;
655 return rhashtable_init(ð->flow_table, &mtk_flow_ht_params);
656 }
657