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1 From: Felix Fietkau <nbd@nbd.name>
2 Date: Wed, 24 Mar 2021 02:30:54 +0100
3 Subject: [PATCH] net: ethernet: mtk_eth_soc: add flow offloading support
4
5 This adds support for offloading IPv4 routed flows, including SNAT/DNAT,
6 one VLAN, PPPoE and DSA.
7
8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
9 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
10 ---
11 create mode 100644 drivers/net/ethernet/mediatek/mtk_ppe_offload.c
12
13 --- a/drivers/net/ethernet/mediatek/Makefile
14 +++ b/drivers/net/ethernet/mediatek/Makefile
15 @@ -4,5 +4,5 @@
16 #
17
18 obj-$(CONFIG_NET_MEDIATEK_SOC) += mtk_eth.o
19 -mtk_eth-y := mtk_eth_soc.o mtk_sgmii.o mtk_eth_path.o mtk_ppe.o mtk_ppe_debugfs.o
20 +mtk_eth-y := mtk_eth_soc.o mtk_sgmii.o mtk_eth_path.o mtk_ppe.o mtk_ppe_debugfs.o mtk_ppe_offload.o
21 obj-$(CONFIG_NET_MEDIATEK_STAR_EMAC) += mtk_star_emac.o
22 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
23 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
24 @@ -2859,6 +2859,7 @@ static const struct net_device_ops mtk_n
25 #ifdef CONFIG_NET_POLL_CONTROLLER
26 .ndo_poll_controller = mtk_poll_controller,
27 #endif
28 + .ndo_setup_tc = mtk_eth_setup_tc,
29 };
30
31 static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
32 @@ -3117,6 +3118,10 @@ static int mtk_probe(struct platform_dev
33 eth->base + MTK_ETH_PPE_BASE, 2);
34 if (err)
35 goto err_free_dev;
36 +
37 + err = mtk_eth_offload_init(eth);
38 + if (err)
39 + goto err_free_dev;
40 }
41
42 for (i = 0; i < MTK_MAX_DEVS; i++) {
43 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
44 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
45 @@ -15,6 +15,7 @@
46 #include <linux/u64_stats_sync.h>
47 #include <linux/refcount.h>
48 #include <linux/phylink.h>
49 +#include <linux/rhashtable.h>
50 #include "mtk_ppe.h"
51
52 #define MTK_QDMA_PAGE_SIZE 2048
53 @@ -40,7 +41,8 @@
54 NETIF_F_HW_VLAN_CTAG_RX | \
55 NETIF_F_SG | NETIF_F_TSO | \
56 NETIF_F_TSO6 | \
57 - NETIF_F_IPV6_CSUM)
58 + NETIF_F_IPV6_CSUM |\
59 + NETIF_F_HW_TC)
60 #define MTK_HW_FEATURES_MT7628 (NETIF_F_SG | NETIF_F_RXCSUM)
61 #define NEXT_DESP_IDX(X, Y) (((X) + 1) & ((Y) - 1))
62
63 @@ -930,6 +932,7 @@ struct mtk_eth {
64 int ip_align;
65
66 struct mtk_ppe ppe;
67 + struct rhashtable flow_table;
68 };
69
70 /* struct mtk_mac - the structure that holds the info about the MACs of the
71 @@ -974,4 +977,9 @@ int mtk_gmac_sgmii_path_setup(struct mtk
72 int mtk_gmac_gephy_path_setup(struct mtk_eth *eth, int mac_id);
73 int mtk_gmac_rgmii_path_setup(struct mtk_eth *eth, int mac_id);
74
75 +int mtk_eth_offload_init(struct mtk_eth *eth);
76 +int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
77 + void *type_data);
78 +
79 +
80 #endif /* MTK_ETH_H */
81 --- /dev/null
82 +++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
83 @@ -0,0 +1,485 @@
84 +// SPDX-License-Identifier: GPL-2.0-only
85 +/*
86 + * Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
87 + */
88 +
89 +#include <linux/if_ether.h>
90 +#include <linux/rhashtable.h>
91 +#include <linux/if_ether.h>
92 +#include <linux/ip.h>
93 +#include <net/flow_offload.h>
94 +#include <net/pkt_cls.h>
95 +#include <net/dsa.h>
96 +#include "mtk_eth_soc.h"
97 +
98 +struct mtk_flow_data {
99 + struct ethhdr eth;
100 +
101 + union {
102 + struct {
103 + __be32 src_addr;
104 + __be32 dst_addr;
105 + } v4;
106 + };
107 +
108 + __be16 src_port;
109 + __be16 dst_port;
110 +
111 + struct {
112 + u16 id;
113 + __be16 proto;
114 + u8 num;
115 + } vlan;
116 + struct {
117 + u16 sid;
118 + u8 num;
119 + } pppoe;
120 +};
121 +
122 +struct mtk_flow_entry {
123 + struct rhash_head node;
124 + unsigned long cookie;
125 + u16 hash;
126 +};
127 +
128 +static const struct rhashtable_params mtk_flow_ht_params = {
129 + .head_offset = offsetof(struct mtk_flow_entry, node),
130 + .head_offset = offsetof(struct mtk_flow_entry, cookie),
131 + .key_len = sizeof(unsigned long),
132 + .automatic_shrinking = true,
133 +};
134 +
135 +static u32
136 +mtk_eth_timestamp(struct mtk_eth *eth)
137 +{
138 + return mtk_r32(eth, 0x0010) & MTK_FOE_IB1_BIND_TIMESTAMP;
139 +}
140 +
141 +static int
142 +mtk_flow_set_ipv4_addr(struct mtk_foe_entry *foe, struct mtk_flow_data *data,
143 + bool egress)
144 +{
145 + return mtk_foe_entry_set_ipv4_tuple(foe, egress,
146 + data->v4.src_addr, data->src_port,
147 + data->v4.dst_addr, data->dst_port);
148 +}
149 +
150 +static void
151 +mtk_flow_offload_mangle_eth(const struct flow_action_entry *act, void *eth)
152 +{
153 + void *dest = eth + act->mangle.offset;
154 + const void *src = &act->mangle.val;
155 +
156 + if (act->mangle.offset > 8)
157 + return;
158 +
159 + if (act->mangle.mask == 0xffff) {
160 + src += 2;
161 + dest += 2;
162 + }
163 +
164 + memcpy(dest, src, act->mangle.mask ? 2 : 4);
165 +}
166 +
167 +
168 +static int
169 +mtk_flow_mangle_ports(const struct flow_action_entry *act,
170 + struct mtk_flow_data *data)
171 +{
172 + u32 val = ntohl(act->mangle.val);
173 +
174 + switch (act->mangle.offset) {
175 + case 0:
176 + if (act->mangle.mask == ~htonl(0xffff))
177 + data->dst_port = cpu_to_be16(val);
178 + else
179 + data->src_port = cpu_to_be16(val >> 16);
180 + break;
181 + case 2:
182 + data->dst_port = cpu_to_be16(val);
183 + break;
184 + default:
185 + return -EINVAL;
186 + }
187 +
188 + return 0;
189 +}
190 +
191 +static int
192 +mtk_flow_mangle_ipv4(const struct flow_action_entry *act,
193 + struct mtk_flow_data *data)
194 +{
195 + __be32 *dest;
196 +
197 + switch (act->mangle.offset) {
198 + case offsetof(struct iphdr, saddr):
199 + dest = &data->v4.src_addr;
200 + break;
201 + case offsetof(struct iphdr, daddr):
202 + dest = &data->v4.dst_addr;
203 + break;
204 + default:
205 + return -EINVAL;
206 + }
207 +
208 + memcpy(dest, &act->mangle.val, sizeof(u32));
209 +
210 + return 0;
211 +}
212 +
213 +static int
214 +mtk_flow_get_dsa_port(struct net_device **dev)
215 +{
216 +#if IS_ENABLED(CONFIG_NET_DSA)
217 + struct dsa_port *dp;
218 +
219 + dp = dsa_port_from_netdev(*dev);
220 + if (IS_ERR(dp))
221 + return -ENODEV;
222 +
223 + if (dp->cpu_dp->tag_ops->proto != DSA_TAG_PROTO_MTK)
224 + return -ENODEV;
225 +
226 + *dev = dp->cpu_dp->master;
227 +
228 + return dp->index;
229 +#else
230 + return -ENODEV;
231 +#endif
232 +}
233 +
234 +static int
235 +mtk_flow_set_output_device(struct mtk_eth *eth, struct mtk_foe_entry *foe,
236 + struct net_device *dev)
237 +{
238 + int pse_port, dsa_port;
239 +
240 + dsa_port = mtk_flow_get_dsa_port(&dev);
241 + if (dsa_port >= 0)
242 + mtk_foe_entry_set_dsa(foe, dsa_port);
243 +
244 + if (dev == eth->netdev[0])
245 + pse_port = 1;
246 + else if (dev == eth->netdev[1])
247 + pse_port = 2;
248 + else
249 + return -EOPNOTSUPP;
250 +
251 + mtk_foe_entry_set_pse_port(foe, pse_port);
252 +
253 + return 0;
254 +}
255 +
256 +static int
257 +mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f)
258 +{
259 + struct flow_rule *rule = flow_cls_offload_flow_rule(f);
260 + struct flow_action_entry *act;
261 + struct mtk_flow_data data = {};
262 + struct mtk_foe_entry foe;
263 + struct net_device *odev = NULL;
264 + struct mtk_flow_entry *entry;
265 + int offload_type = 0;
266 + u16 addr_type = 0;
267 + u32 timestamp;
268 + u8 l4proto = 0;
269 + int err = 0;
270 + int hash;
271 + int i;
272 +
273 + if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META)) {
274 + struct flow_match_meta match;
275 +
276 + flow_rule_match_meta(rule, &match);
277 + } else {
278 + return -EOPNOTSUPP;
279 + }
280 +
281 + if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
282 + struct flow_match_control match;
283 +
284 + flow_rule_match_control(rule, &match);
285 + addr_type = match.key->addr_type;
286 + } else {
287 + return -EOPNOTSUPP;
288 + }
289 +
290 + if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
291 + struct flow_match_basic match;
292 +
293 + flow_rule_match_basic(rule, &match);
294 + l4proto = match.key->ip_proto;
295 + } else {
296 + return -EOPNOTSUPP;
297 + }
298 +
299 + flow_action_for_each(i, act, &rule->action) {
300 + switch (act->id) {
301 + case FLOW_ACTION_MANGLE:
302 + if (act->mangle.htype == FLOW_ACT_MANGLE_HDR_TYPE_ETH)
303 + mtk_flow_offload_mangle_eth(act, &data.eth);
304 + break;
305 + case FLOW_ACTION_REDIRECT:
306 + odev = act->dev;
307 + break;
308 + case FLOW_ACTION_CSUM:
309 + break;
310 + case FLOW_ACTION_VLAN_PUSH:
311 + if (data.vlan.num == 1 ||
312 + act->vlan.proto != htons(ETH_P_8021Q))
313 + return -EOPNOTSUPP;
314 +
315 + data.vlan.id = act->vlan.vid;
316 + data.vlan.proto = act->vlan.proto;
317 + data.vlan.num++;
318 + break;
319 + case FLOW_ACTION_PPPOE_PUSH:
320 + if (data.pppoe.num == 1)
321 + return -EOPNOTSUPP;
322 +
323 + data.pppoe.sid = act->pppoe.sid;
324 + data.pppoe.num++;
325 + break;
326 + default:
327 + return -EOPNOTSUPP;
328 + }
329 + }
330 +
331 + switch (addr_type) {
332 + case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
333 + offload_type = MTK_PPE_PKT_TYPE_IPV4_HNAPT;
334 + break;
335 + default:
336 + return -EOPNOTSUPP;
337 + }
338 +
339 + if (!is_valid_ether_addr(data.eth.h_source) ||
340 + !is_valid_ether_addr(data.eth.h_dest))
341 + return -EINVAL;
342 +
343 + err = mtk_foe_entry_prepare(&foe, offload_type, l4proto, 0,
344 + data.eth.h_source,
345 + data.eth.h_dest);
346 + if (err)
347 + return err;
348 +
349 + if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
350 + struct flow_match_ports ports;
351 +
352 + flow_rule_match_ports(rule, &ports);
353 + data.src_port = ports.key->src;
354 + data.dst_port = ports.key->dst;
355 + } else {
356 + return -EOPNOTSUPP;
357 + }
358 +
359 + if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
360 + struct flow_match_ipv4_addrs addrs;
361 +
362 + flow_rule_match_ipv4_addrs(rule, &addrs);
363 +
364 + data.v4.src_addr = addrs.key->src;
365 + data.v4.dst_addr = addrs.key->dst;
366 +
367 + mtk_flow_set_ipv4_addr(&foe, &data, false);
368 + }
369 +
370 + flow_action_for_each(i, act, &rule->action) {
371 + if (act->id != FLOW_ACTION_MANGLE)
372 + continue;
373 +
374 + switch (act->mangle.htype) {
375 + case FLOW_ACT_MANGLE_HDR_TYPE_TCP:
376 + case FLOW_ACT_MANGLE_HDR_TYPE_UDP:
377 + err = mtk_flow_mangle_ports(act, &data);
378 + break;
379 + case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
380 + err = mtk_flow_mangle_ipv4(act, &data);
381 + break;
382 + case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
383 + /* handled earlier */
384 + break;
385 + default:
386 + return -EOPNOTSUPP;
387 + }
388 +
389 + if (err)
390 + return err;
391 + }
392 +
393 + if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
394 + err = mtk_flow_set_ipv4_addr(&foe, &data, true);
395 + if (err)
396 + return err;
397 + }
398 +
399 + if (data.vlan.num == 1) {
400 + if (data.vlan.proto != htons(ETH_P_8021Q))
401 + return -EOPNOTSUPP;
402 +
403 + mtk_foe_entry_set_vlan(&foe, data.vlan.id);
404 + }
405 + if (data.pppoe.num == 1)
406 + mtk_foe_entry_set_pppoe(&foe, data.pppoe.sid);
407 +
408 + err = mtk_flow_set_output_device(eth, &foe, odev);
409 + if (err)
410 + return err;
411 +
412 + entry = kzalloc(sizeof(*entry), GFP_KERNEL);
413 + if (!entry)
414 + return -ENOMEM;
415 +
416 + entry->cookie = f->cookie;
417 + timestamp = mtk_eth_timestamp(eth);
418 + hash = mtk_foe_entry_commit(&eth->ppe, &foe, timestamp);
419 + if (hash < 0) {
420 + err = hash;
421 + goto free;
422 + }
423 +
424 + entry->hash = hash;
425 + err = rhashtable_insert_fast(&eth->flow_table, &entry->node,
426 + mtk_flow_ht_params);
427 + if (err < 0)
428 + goto clear_flow;
429 +
430 + return 0;
431 +clear_flow:
432 + mtk_foe_entry_clear(&eth->ppe, hash);
433 +free:
434 + kfree(entry);
435 + return err;
436 +}
437 +
438 +static int
439 +mtk_flow_offload_destroy(struct mtk_eth *eth, struct flow_cls_offload *f)
440 +{
441 + struct mtk_flow_entry *entry;
442 +
443 + entry = rhashtable_lookup(&eth->flow_table, &f->cookie,
444 + mtk_flow_ht_params);
445 + if (!entry)
446 + return -ENOENT;
447 +
448 + mtk_foe_entry_clear(&eth->ppe, entry->hash);
449 + rhashtable_remove_fast(&eth->flow_table, &entry->node,
450 + mtk_flow_ht_params);
451 + kfree(entry);
452 +
453 + return 0;
454 +}
455 +
456 +static int
457 +mtk_flow_offload_stats(struct mtk_eth *eth, struct flow_cls_offload *f)
458 +{
459 + struct mtk_flow_entry *entry;
460 + int timestamp;
461 + u32 idle;
462 +
463 + entry = rhashtable_lookup(&eth->flow_table, &f->cookie,
464 + mtk_flow_ht_params);
465 + if (!entry)
466 + return -ENOENT;
467 +
468 + timestamp = mtk_foe_entry_timestamp(&eth->ppe, entry->hash);
469 + if (timestamp < 0)
470 + return -ETIMEDOUT;
471 +
472 + idle = mtk_eth_timestamp(eth) - timestamp;
473 + f->stats.lastused = jiffies - idle * HZ;
474 +
475 + return 0;
476 +}
477 +
478 +static int
479 +mtk_eth_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
480 +{
481 + struct flow_cls_offload *cls = type_data;
482 + struct net_device *dev = cb_priv;
483 + struct mtk_mac *mac = netdev_priv(dev);
484 + struct mtk_eth *eth = mac->hw;
485 +
486 + if (!tc_can_offload(dev))
487 + return -EOPNOTSUPP;
488 +
489 + if (type != TC_SETUP_CLSFLOWER)
490 + return -EOPNOTSUPP;
491 +
492 + switch (cls->command) {
493 + case FLOW_CLS_REPLACE:
494 + return mtk_flow_offload_replace(eth, cls);
495 + case FLOW_CLS_DESTROY:
496 + return mtk_flow_offload_destroy(eth, cls);
497 + case FLOW_CLS_STATS:
498 + return mtk_flow_offload_stats(eth, cls);
499 + default:
500 + return -EOPNOTSUPP;
501 + }
502 +
503 + return 0;
504 +}
505 +
506 +static int
507 +mtk_eth_setup_tc_block(struct net_device *dev, struct flow_block_offload *f)
508 +{
509 + struct mtk_mac *mac = netdev_priv(dev);
510 + struct mtk_eth *eth = mac->hw;
511 + static LIST_HEAD(block_cb_list);
512 + struct flow_block_cb *block_cb;
513 + flow_setup_cb_t *cb;
514 +
515 + if (!eth->ppe.foe_table)
516 + return -EOPNOTSUPP;
517 +
518 + if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
519 + return -EOPNOTSUPP;
520 +
521 + cb = mtk_eth_setup_tc_block_cb;
522 + f->driver_block_list = &block_cb_list;
523 +
524 + switch (f->command) {
525 + case FLOW_BLOCK_BIND:
526 + block_cb = flow_block_cb_lookup(f->block, cb, dev);
527 + if (block_cb) {
528 + flow_block_cb_incref(block_cb);
529 + return 0;
530 + }
531 + block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
532 + if (IS_ERR(block_cb))
533 + return PTR_ERR(block_cb);
534 +
535 + flow_block_cb_add(block_cb, f);
536 + list_add_tail(&block_cb->driver_list, &block_cb_list);
537 + return 0;
538 + case FLOW_BLOCK_UNBIND:
539 + block_cb = flow_block_cb_lookup(f->block, cb, dev);
540 + if (!block_cb)
541 + return -ENOENT;
542 +
543 + if (flow_block_cb_decref(block_cb)) {
544 + flow_block_cb_remove(block_cb, f);
545 + list_del(&block_cb->driver_list);
546 + }
547 + return 0;
548 + default:
549 + return -EOPNOTSUPP;
550 + }
551 +}
552 +
553 +int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
554 + void *type_data)
555 +{
556 + if (type == TC_SETUP_FT)
557 + return mtk_eth_setup_tc_block(dev, type_data);
558 +
559 + return -EOPNOTSUPP;
560 +}
561 +
562 +int mtk_eth_offload_init(struct mtk_eth *eth)
563 +{
564 + if (!eth->ppe.foe_table)
565 + return 0;
566 +
567 + return rhashtable_init(&eth->flow_table, &mtk_flow_ht_params);
568 +}
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