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1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2019 Solarflare Communications Inc.
5 * Copyright 2020-2022 Xilinx Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation, incorporated herein by reference.
10 */
11
12#include <net/pkt_cls.h>
13#include <net/vxlan.h>
14#include <net/geneve.h>
15#include <net/tc_act/tc_ct.h>
16#include "tc.h"
17#include "tc_bindings.h"
18#include "tc_encap_actions.h"
19#include "tc_conntrack.h"
20#include "mae.h"
21#include "ef100_rep.h"
22#include "efx.h"
23
24enum efx_encap_type efx_tc_indr_netdev_type(struct net_device *net_dev)
25{
26 if (netif_is_vxlan(net_dev))
27 return EFX_ENCAP_TYPE_VXLAN;
28 if (netif_is_geneve(net_dev))
29 return EFX_ENCAP_TYPE_GENEVE;
30
31 return EFX_ENCAP_TYPE_NONE;
32}
33
34#define EFX_TC_HDR_TYPE_TTL_MASK ((u32)0xff)
35/* Hoplimit is stored in the most significant byte in the pedit ipv6 header action */
36#define EFX_TC_HDR_TYPE_HLIMIT_MASK ~((u32)0xff000000)
37#define EFX_EFV_PF NULL
38/* Look up the representor information (efv) for a device.
39 * May return NULL for the PF (us), or an error pointer for a device that
40 * isn't supported as a TC offload endpoint
41 */
42struct efx_rep *efx_tc_flower_lookup_efv(struct efx_nic *efx,
43 struct net_device *dev)
44{
45 struct efx_rep *efv;
46
47 if (!dev)
48 return ERR_PTR(-EOPNOTSUPP);
49 /* Is it us (the PF)? */
50 if (dev == efx->net_dev)
51 return EFX_EFV_PF;
52 /* Is it an efx vfrep at all? */
53 if (dev->netdev_ops != &efx_ef100_rep_netdev_ops)
54 return ERR_PTR(-EOPNOTSUPP);
55 /* Is it ours? We don't support TC rules that include another
56 * EF100's netdevices (not even on another port of the same NIC).
57 */
58 efv = netdev_priv(dev);
59 if (efv->parent != efx)
60 return ERR_PTR(-EOPNOTSUPP);
61 return efv;
62}
63
64/* Convert a driver-internal vport ID into an internal device (PF or VF) */
65static s64 efx_tc_flower_internal_mport(struct efx_nic *efx, struct efx_rep *efv)
66{
67 u32 mport;
68
69 if (IS_ERR(efv))
70 return PTR_ERR(efv);
71 if (!efv) /* device is PF (us) */
72 efx_mae_mport_uplink(efx, &mport);
73 else /* device is repr */
74 efx_mae_mport_mport(efx, efv->mport, &mport);
75 return mport;
76}
77
78/* Convert a driver-internal vport ID into an external device (wire or VF) */
79s64 efx_tc_flower_external_mport(struct efx_nic *efx, struct efx_rep *efv)
80{
81 u32 mport;
82
83 if (IS_ERR(efv))
84 return PTR_ERR(efv);
85 if (!efv) /* device is PF (us) */
86 efx_mae_mport_wire(efx, &mport);
87 else /* device is repr */
88 efx_mae_mport_mport(efx, efv->mport, &mport);
89 return mport;
90}
91
92static const struct rhashtable_params efx_tc_mac_ht_params = {
93 .key_len = offsetofend(struct efx_tc_mac_pedit_action, h_addr),
94 .key_offset = 0,
95 .head_offset = offsetof(struct efx_tc_mac_pedit_action, linkage),
96};
97
98static const struct rhashtable_params efx_tc_encap_match_ht_params = {
99 .key_len = offsetof(struct efx_tc_encap_match, linkage),
100 .key_offset = 0,
101 .head_offset = offsetof(struct efx_tc_encap_match, linkage),
102};
103
104static const struct rhashtable_params efx_tc_match_action_ht_params = {
105 .key_len = sizeof(unsigned long),
106 .key_offset = offsetof(struct efx_tc_flow_rule, cookie),
107 .head_offset = offsetof(struct efx_tc_flow_rule, linkage),
108};
109
110static const struct rhashtable_params efx_tc_lhs_rule_ht_params = {
111 .key_len = sizeof(unsigned long),
112 .key_offset = offsetof(struct efx_tc_lhs_rule, cookie),
113 .head_offset = offsetof(struct efx_tc_lhs_rule, linkage),
114};
115
116static const struct rhashtable_params efx_tc_recirc_ht_params = {
117 .key_len = offsetof(struct efx_tc_recirc_id, linkage),
118 .key_offset = 0,
119 .head_offset = offsetof(struct efx_tc_recirc_id, linkage),
120};
121
122static struct efx_tc_mac_pedit_action *efx_tc_flower_get_mac(struct efx_nic *efx,
123 unsigned char h_addr[ETH_ALEN],
124 struct netlink_ext_ack *extack)
125{
126 struct efx_tc_mac_pedit_action *ped, *old;
127 int rc;
128
129 ped = kzalloc(sizeof(*ped), GFP_USER);
130 if (!ped)
131 return ERR_PTR(-ENOMEM);
132 memcpy(ped->h_addr, h_addr, ETH_ALEN);
133 old = rhashtable_lookup_get_insert_fast(&efx->tc->mac_ht,
134 &ped->linkage,
135 efx_tc_mac_ht_params);
136 if (old) {
137 /* don't need our new entry */
138 kfree(ped);
139 if (IS_ERR(old)) /* oh dear, it's actually an error */
140 return ERR_CAST(old);
141 if (!refcount_inc_not_zero(&old->ref))
142 return ERR_PTR(-EAGAIN);
143 /* existing entry found, ref taken */
144 return old;
145 }
146
147 rc = efx_mae_allocate_pedit_mac(efx, ped);
148 if (rc < 0) {
149 NL_SET_ERR_MSG_MOD(extack, "Failed to store pedit MAC address in hw");
150 goto out_remove;
151 }
152
153 /* ref and return */
154 refcount_set(&ped->ref, 1);
155 return ped;
156out_remove:
157 rhashtable_remove_fast(&efx->tc->mac_ht, &ped->linkage,
158 efx_tc_mac_ht_params);
159 kfree(ped);
160 return ERR_PTR(rc);
161}
162
163static void efx_tc_flower_put_mac(struct efx_nic *efx,
164 struct efx_tc_mac_pedit_action *ped)
165{
166 if (!refcount_dec_and_test(&ped->ref))
167 return; /* still in use */
168 rhashtable_remove_fast(&efx->tc->mac_ht, &ped->linkage,
169 efx_tc_mac_ht_params);
170 efx_mae_free_pedit_mac(efx, ped);
171 kfree(ped);
172}
173
174static void efx_tc_free_action_set(struct efx_nic *efx,
175 struct efx_tc_action_set *act, bool in_hw)
176{
177 /* Failure paths calling this on the 'cursor' action set in_hw=false,
178 * because if the alloc had succeeded we'd've put it in acts.list and
179 * not still have it in act.
180 */
181 if (in_hw) {
182 efx_mae_free_action_set(efx, act->fw_id);
183 /* in_hw is true iff we are on an acts.list; make sure to
184 * remove ourselves from that list before we are freed.
185 */
186 list_del(&act->list);
187 }
188 if (act->count) {
189 spin_lock_bh(&act->count->cnt->lock);
190 if (!list_empty(&act->count_user))
191 list_del(&act->count_user);
192 spin_unlock_bh(&act->count->cnt->lock);
193 efx_tc_flower_put_counter_index(efx, act->count);
194 }
195 if (act->encap_md) {
196 list_del(&act->encap_user);
197 efx_tc_flower_release_encap_md(efx, act->encap_md);
198 }
199 if (act->src_mac)
200 efx_tc_flower_put_mac(efx, act->src_mac);
201 if (act->dst_mac)
202 efx_tc_flower_put_mac(efx, act->dst_mac);
203 kfree(act);
204}
205
206static void efx_tc_free_action_set_list(struct efx_nic *efx,
207 struct efx_tc_action_set_list *acts,
208 bool in_hw)
209{
210 struct efx_tc_action_set *act, *next;
211
212 /* Failure paths set in_hw=false, because usually the acts didn't get
213 * to efx_mae_alloc_action_set_list(); if they did, the failure tree
214 * has a separate efx_mae_free_action_set_list() before calling us.
215 */
216 if (in_hw)
217 efx_mae_free_action_set_list(efx, acts);
218 /* Any act that's on the list will be in_hw even if the list isn't */
219 list_for_each_entry_safe(act, next, &acts->list, list)
220 efx_tc_free_action_set(efx, act, true);
221 /* Don't kfree, as acts is embedded inside a struct efx_tc_flow_rule */
222}
223
224/* Boilerplate for the simple 'copy a field' cases */
225#define _MAP_KEY_AND_MASK(_name, _type, _tcget, _tcfield, _field) \
226if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_##_name)) { \
227 struct flow_match_##_type fm; \
228 \
229 flow_rule_match_##_tcget(rule, &fm); \
230 match->value._field = fm.key->_tcfield; \
231 match->mask._field = fm.mask->_tcfield; \
232}
233#define MAP_KEY_AND_MASK(_name, _type, _tcfield, _field) \
234 _MAP_KEY_AND_MASK(_name, _type, _type, _tcfield, _field)
235#define MAP_ENC_KEY_AND_MASK(_name, _type, _tcget, _tcfield, _field) \
236 _MAP_KEY_AND_MASK(ENC_##_name, _type, _tcget, _tcfield, _field)
237
238static int efx_tc_flower_parse_match(struct efx_nic *efx,
239 struct flow_rule *rule,
240 struct efx_tc_match *match,
241 struct netlink_ext_ack *extack)
242{
243 struct flow_dissector *dissector = rule->match.dissector;
244 unsigned char ipv = 0;
245
246 /* Owing to internal TC infelicities, the IPV6_ADDRS key might be set
247 * even on IPv4 filters; so rather than relying on dissector->used_keys
248 * we check the addr_type in the CONTROL key. If we don't find it (or
249 * it's masked, which should never happen), we treat both IPV4_ADDRS
250 * and IPV6_ADDRS as absent.
251 */
252 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
253 struct flow_match_control fm;
254
255 flow_rule_match_control(rule, &fm);
256 if (IS_ALL_ONES(fm.mask->addr_type))
257 switch (fm.key->addr_type) {
258 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
259 ipv = 4;
260 break;
261 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
262 ipv = 6;
263 break;
264 default:
265 break;
266 }
267
268 if (fm.mask->flags & FLOW_DIS_IS_FRAGMENT) {
269 match->value.ip_frag = fm.key->flags & FLOW_DIS_IS_FRAGMENT;
270 match->mask.ip_frag = true;
271 }
272 if (fm.mask->flags & FLOW_DIS_FIRST_FRAG) {
273 match->value.ip_firstfrag = fm.key->flags & FLOW_DIS_FIRST_FRAG;
274 match->mask.ip_firstfrag = true;
275 }
276 if (fm.mask->flags & ~(FLOW_DIS_IS_FRAGMENT | FLOW_DIS_FIRST_FRAG)) {
277 NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported match on control.flags %#x",
278 fm.mask->flags);
279 return -EOPNOTSUPP;
280 }
281 }
282 if (dissector->used_keys &
283 ~(BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
284 BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
285 BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
286 BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) |
287 BIT_ULL(FLOW_DISSECTOR_KEY_CVLAN) |
288 BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
289 BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
290 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
291 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) |
292 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) |
293 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
294 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP) |
295 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS) |
296 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) |
297 BIT_ULL(FLOW_DISSECTOR_KEY_CT) |
298 BIT_ULL(FLOW_DISSECTOR_KEY_TCP) |
299 BIT_ULL(FLOW_DISSECTOR_KEY_IP))) {
300 NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported flower keys %#llx",
301 dissector->used_keys);
302 return -EOPNOTSUPP;
303 }
304
305 MAP_KEY_AND_MASK(BASIC, basic, n_proto, eth_proto);
306 /* Make sure we're IP if any L3/L4 keys used. */
307 if (!IS_ALL_ONES(match->mask.eth_proto) ||
308 !(match->value.eth_proto == htons(ETH_P_IP) ||
309 match->value.eth_proto == htons(ETH_P_IPV6)))
310 if (dissector->used_keys &
311 (BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
312 BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
313 BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
314 BIT_ULL(FLOW_DISSECTOR_KEY_IP) |
315 BIT_ULL(FLOW_DISSECTOR_KEY_TCP))) {
316 NL_SET_ERR_MSG_FMT_MOD(extack,
317 "L3/L4 flower keys %#llx require protocol ipv[46]",
318 dissector->used_keys);
319 return -EINVAL;
320 }
321
322 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
323 struct flow_match_vlan fm;
324
325 flow_rule_match_vlan(rule, &fm);
326 if (fm.mask->vlan_id || fm.mask->vlan_priority || fm.mask->vlan_tpid) {
327 match->value.vlan_proto[0] = fm.key->vlan_tpid;
328 match->mask.vlan_proto[0] = fm.mask->vlan_tpid;
329 match->value.vlan_tci[0] = cpu_to_be16(fm.key->vlan_priority << 13 |
330 fm.key->vlan_id);
331 match->mask.vlan_tci[0] = cpu_to_be16(fm.mask->vlan_priority << 13 |
332 fm.mask->vlan_id);
333 }
334 }
335
336 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CVLAN)) {
337 struct flow_match_vlan fm;
338
339 flow_rule_match_cvlan(rule, &fm);
340 if (fm.mask->vlan_id || fm.mask->vlan_priority || fm.mask->vlan_tpid) {
341 match->value.vlan_proto[1] = fm.key->vlan_tpid;
342 match->mask.vlan_proto[1] = fm.mask->vlan_tpid;
343 match->value.vlan_tci[1] = cpu_to_be16(fm.key->vlan_priority << 13 |
344 fm.key->vlan_id);
345 match->mask.vlan_tci[1] = cpu_to_be16(fm.mask->vlan_priority << 13 |
346 fm.mask->vlan_id);
347 }
348 }
349
350 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
351 struct flow_match_eth_addrs fm;
352
353 flow_rule_match_eth_addrs(rule, &fm);
354 ether_addr_copy(match->value.eth_saddr, fm.key->src);
355 ether_addr_copy(match->value.eth_daddr, fm.key->dst);
356 ether_addr_copy(match->mask.eth_saddr, fm.mask->src);
357 ether_addr_copy(match->mask.eth_daddr, fm.mask->dst);
358 }
359
360 MAP_KEY_AND_MASK(BASIC, basic, ip_proto, ip_proto);
361 /* Make sure we're TCP/UDP if any L4 keys used. */
362 if ((match->value.ip_proto != IPPROTO_UDP &&
363 match->value.ip_proto != IPPROTO_TCP) || !IS_ALL_ONES(match->mask.ip_proto))
364 if (dissector->used_keys &
365 (BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
366 BIT_ULL(FLOW_DISSECTOR_KEY_TCP))) {
367 NL_SET_ERR_MSG_FMT_MOD(extack,
368 "L4 flower keys %#llx require ipproto udp or tcp",
369 dissector->used_keys);
370 return -EINVAL;
371 }
372 MAP_KEY_AND_MASK(IP, ip, tos, ip_tos);
373 MAP_KEY_AND_MASK(IP, ip, ttl, ip_ttl);
374 if (ipv == 4) {
375 MAP_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, src, src_ip);
376 MAP_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, dst, dst_ip);
377 }
378#ifdef CONFIG_IPV6
379 else if (ipv == 6) {
380 MAP_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, src, src_ip6);
381 MAP_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, dst, dst_ip6);
382 }
383#endif
384 MAP_KEY_AND_MASK(PORTS, ports, src, l4_sport);
385 MAP_KEY_AND_MASK(PORTS, ports, dst, l4_dport);
386 MAP_KEY_AND_MASK(TCP, tcp, flags, tcp_flags);
387 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
388 struct flow_match_control fm;
389
390 flow_rule_match_enc_control(rule, &fm);
391 if (fm.mask->flags) {
392 NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported match on enc_control.flags %#x",
393 fm.mask->flags);
394 return -EOPNOTSUPP;
395 }
396 if (!IS_ALL_ONES(fm.mask->addr_type)) {
397 NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported enc addr_type mask %u (key %u)",
398 fm.mask->addr_type,
399 fm.key->addr_type);
400 return -EOPNOTSUPP;
401 }
402 switch (fm.key->addr_type) {
403 case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
404 MAP_ENC_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, enc_ipv4_addrs,
405 src, enc_src_ip);
406 MAP_ENC_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, enc_ipv4_addrs,
407 dst, enc_dst_ip);
408 break;
409#ifdef CONFIG_IPV6
410 case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
411 MAP_ENC_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, enc_ipv6_addrs,
412 src, enc_src_ip6);
413 MAP_ENC_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, enc_ipv6_addrs,
414 dst, enc_dst_ip6);
415 break;
416#endif
417 default:
418 NL_SET_ERR_MSG_FMT_MOD(extack,
419 "Unsupported enc addr_type %u (supported are IPv4, IPv6)",
420 fm.key->addr_type);
421 return -EOPNOTSUPP;
422 }
423 MAP_ENC_KEY_AND_MASK(IP, ip, enc_ip, tos, enc_ip_tos);
424 MAP_ENC_KEY_AND_MASK(IP, ip, enc_ip, ttl, enc_ip_ttl);
425 MAP_ENC_KEY_AND_MASK(PORTS, ports, enc_ports, src, enc_sport);
426 MAP_ENC_KEY_AND_MASK(PORTS, ports, enc_ports, dst, enc_dport);
427 MAP_ENC_KEY_AND_MASK(KEYID, enc_keyid, enc_keyid, keyid, enc_keyid);
428 } else if (dissector->used_keys &
429 (BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) |
430 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) |
431 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
432 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP) |
433 BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS))) {
434 NL_SET_ERR_MSG_FMT_MOD(extack,
435 "Flower enc keys require enc_control (keys: %#llx)",
436 dissector->used_keys);
437 return -EOPNOTSUPP;
438 }
439 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CT)) {
440 struct flow_match_ct fm;
441
442 flow_rule_match_ct(rule, &fm);
443 match->value.ct_state_trk = !!(fm.key->ct_state & TCA_FLOWER_KEY_CT_FLAGS_TRACKED);
444 match->mask.ct_state_trk = !!(fm.mask->ct_state & TCA_FLOWER_KEY_CT_FLAGS_TRACKED);
445 match->value.ct_state_est = !!(fm.key->ct_state & TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED);
446 match->mask.ct_state_est = !!(fm.mask->ct_state & TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED);
447 if (fm.mask->ct_state & ~(TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
448 TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED)) {
449 NL_SET_ERR_MSG_FMT_MOD(extack,
450 "Unsupported ct_state match %#x",
451 fm.mask->ct_state);
452 return -EOPNOTSUPP;
453 }
454 match->value.ct_mark = fm.key->ct_mark;
455 match->mask.ct_mark = fm.mask->ct_mark;
456 match->value.ct_zone = fm.key->ct_zone;
457 match->mask.ct_zone = fm.mask->ct_zone;
458
459 if (memchr_inv(fm.mask->ct_labels, 0, sizeof(fm.mask->ct_labels))) {
460 NL_SET_ERR_MSG_MOD(extack, "Matching on ct_label not supported");
461 return -EOPNOTSUPP;
462 }
463 }
464
465 return 0;
466}
467
468static void efx_tc_flower_release_encap_match(struct efx_nic *efx,
469 struct efx_tc_encap_match *encap)
470{
471 int rc;
472
473 if (!refcount_dec_and_test(&encap->ref))
474 return; /* still in use */
475
476 if (encap->type == EFX_TC_EM_DIRECT) {
477 rc = efx_mae_unregister_encap_match(efx, encap);
478 if (rc)
479 /* Display message but carry on and remove entry from our
480 * SW tables, because there's not much we can do about it.
481 */
482 netif_err(efx, drv, efx->net_dev,
483 "Failed to release encap match %#x, rc %d\n",
484 encap->fw_id, rc);
485 }
486 rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
487 efx_tc_encap_match_ht_params);
488 if (encap->pseudo)
489 efx_tc_flower_release_encap_match(efx, encap->pseudo);
490 kfree(encap);
491}
492
493static int efx_tc_flower_record_encap_match(struct efx_nic *efx,
494 struct efx_tc_match *match,
495 enum efx_encap_type type,
496 enum efx_tc_em_pseudo_type em_type,
497 u8 child_ip_tos_mask,
498 __be16 child_udp_sport_mask,
499 struct netlink_ext_ack *extack)
500{
501 struct efx_tc_encap_match *encap, *old, *pseudo = NULL;
502 bool ipv6 = false;
503 int rc;
504
505 /* We require that the socket-defining fields (IP addrs and UDP dest
506 * port) are present and exact-match. Other fields may only be used
507 * if the field-set (and any masks) are the same for all encap
508 * matches on the same <sip,dip,dport> tuple; this is enforced by
509 * pseudo encap matches.
510 */
511 if (match->mask.enc_dst_ip | match->mask.enc_src_ip) {
512 if (!IS_ALL_ONES(match->mask.enc_dst_ip)) {
513 NL_SET_ERR_MSG_MOD(extack,
514 "Egress encap match is not exact on dst IP address");
515 return -EOPNOTSUPP;
516 }
517 if (!IS_ALL_ONES(match->mask.enc_src_ip)) {
518 NL_SET_ERR_MSG_MOD(extack,
519 "Egress encap match is not exact on src IP address");
520 return -EOPNOTSUPP;
521 }
522#ifdef CONFIG_IPV6
523 if (!ipv6_addr_any(&match->mask.enc_dst_ip6) ||
524 !ipv6_addr_any(&match->mask.enc_src_ip6)) {
525 NL_SET_ERR_MSG_MOD(extack,
526 "Egress encap match on both IPv4 and IPv6, don't understand");
527 return -EOPNOTSUPP;
528 }
529 } else {
530 ipv6 = true;
531 if (!efx_ipv6_addr_all_ones(&match->mask.enc_dst_ip6)) {
532 NL_SET_ERR_MSG_MOD(extack,
533 "Egress encap match is not exact on dst IP address");
534 return -EOPNOTSUPP;
535 }
536 if (!efx_ipv6_addr_all_ones(&match->mask.enc_src_ip6)) {
537 NL_SET_ERR_MSG_MOD(extack,
538 "Egress encap match is not exact on src IP address");
539 return -EOPNOTSUPP;
540 }
541#endif
542 }
543 if (!IS_ALL_ONES(match->mask.enc_dport)) {
544 NL_SET_ERR_MSG_MOD(extack, "Egress encap match is not exact on dst UDP port");
545 return -EOPNOTSUPP;
546 }
547 if (match->mask.enc_sport || match->mask.enc_ip_tos) {
548 struct efx_tc_match pmatch = *match;
549
550 if (em_type == EFX_TC_EM_PSEUDO_MASK) { /* can't happen */
551 NL_SET_ERR_MSG_MOD(extack, "Bad recursion in egress encap match handler");
552 return -EOPNOTSUPP;
553 }
554 pmatch.value.enc_ip_tos = 0;
555 pmatch.mask.enc_ip_tos = 0;
556 pmatch.value.enc_sport = 0;
557 pmatch.mask.enc_sport = 0;
558 rc = efx_tc_flower_record_encap_match(efx, &pmatch, type,
559 EFX_TC_EM_PSEUDO_MASK,
560 match->mask.enc_ip_tos,
561 match->mask.enc_sport,
562 extack);
563 if (rc)
564 return rc;
565 pseudo = pmatch.encap;
566 }
567 if (match->mask.enc_ip_ttl) {
568 NL_SET_ERR_MSG_MOD(extack, "Egress encap match on IP TTL not supported");
569 rc = -EOPNOTSUPP;
570 goto fail_pseudo;
571 }
572
573 rc = efx_mae_check_encap_match_caps(efx, ipv6, match->mask.enc_ip_tos,
574 match->mask.enc_sport, extack);
575 if (rc)
576 goto fail_pseudo;
577
578 encap = kzalloc(sizeof(*encap), GFP_USER);
579 if (!encap) {
580 rc = -ENOMEM;
581 goto fail_pseudo;
582 }
583 encap->src_ip = match->value.enc_src_ip;
584 encap->dst_ip = match->value.enc_dst_ip;
585#ifdef CONFIG_IPV6
586 encap->src_ip6 = match->value.enc_src_ip6;
587 encap->dst_ip6 = match->value.enc_dst_ip6;
588#endif
589 encap->udp_dport = match->value.enc_dport;
590 encap->tun_type = type;
591 encap->ip_tos = match->value.enc_ip_tos;
592 encap->ip_tos_mask = match->mask.enc_ip_tos;
593 encap->child_ip_tos_mask = child_ip_tos_mask;
594 encap->udp_sport = match->value.enc_sport;
595 encap->udp_sport_mask = match->mask.enc_sport;
596 encap->child_udp_sport_mask = child_udp_sport_mask;
597 encap->type = em_type;
598 encap->pseudo = pseudo;
599 old = rhashtable_lookup_get_insert_fast(&efx->tc->encap_match_ht,
600 &encap->linkage,
601 efx_tc_encap_match_ht_params);
602 if (old) {
603 /* don't need our new entry */
604 kfree(encap);
605 if (pseudo) /* don't need our new pseudo either */
606 efx_tc_flower_release_encap_match(efx, pseudo);
607 if (IS_ERR(old)) /* oh dear, it's actually an error */
608 return PTR_ERR(old);
609 /* check old and new em_types are compatible */
610 switch (old->type) {
611 case EFX_TC_EM_DIRECT:
612 /* old EM is in hardware, so mustn't overlap with a
613 * pseudo, but may be shared with another direct EM
614 */
615 if (em_type == EFX_TC_EM_DIRECT)
616 break;
617 NL_SET_ERR_MSG_MOD(extack, "Pseudo encap match conflicts with existing direct entry");
618 return -EEXIST;
619 case EFX_TC_EM_PSEUDO_MASK:
620 /* old EM is protecting a ToS- or src port-qualified
621 * filter, so may only be shared with another pseudo
622 * for the same ToS and src port masks.
623 */
624 if (em_type != EFX_TC_EM_PSEUDO_MASK) {
625 NL_SET_ERR_MSG_FMT_MOD(extack,
626 "%s encap match conflicts with existing pseudo(MASK) entry",
627 em_type ? "Pseudo" : "Direct");
628 return -EEXIST;
629 }
630 if (child_ip_tos_mask != old->child_ip_tos_mask) {
631 NL_SET_ERR_MSG_FMT_MOD(extack,
632 "Pseudo encap match for TOS mask %#04x conflicts with existing mask %#04x",
633 child_ip_tos_mask,
634 old->child_ip_tos_mask);
635 return -EEXIST;
636 }
637 if (child_udp_sport_mask != old->child_udp_sport_mask) {
638 NL_SET_ERR_MSG_FMT_MOD(extack,
639 "Pseudo encap match for UDP src port mask %#x conflicts with existing mask %#x",
640 child_udp_sport_mask,
641 old->child_udp_sport_mask);
642 return -EEXIST;
643 }
644 break;
645 case EFX_TC_EM_PSEUDO_OR:
646 /* old EM corresponds to an OR that has to be unique
647 * (it must not overlap with any other OR, whether
648 * direct-EM or pseudo).
649 */
650 NL_SET_ERR_MSG_FMT_MOD(extack,
651 "%s encap match conflicts with existing pseudo(OR) entry",
652 em_type ? "Pseudo" : "Direct");
653 return -EEXIST;
654 default: /* Unrecognised pseudo-type. Just say no */
655 NL_SET_ERR_MSG_FMT_MOD(extack,
656 "%s encap match conflicts with existing pseudo(%d) entry",
657 em_type ? "Pseudo" : "Direct",
658 old->type);
659 return -EEXIST;
660 }
661 /* check old and new tun_types are compatible */
662 if (old->tun_type != type) {
663 NL_SET_ERR_MSG_FMT_MOD(extack,
664 "Egress encap match with conflicting tun_type %u != %u",
665 old->tun_type, type);
666 return -EEXIST;
667 }
668 if (!refcount_inc_not_zero(&old->ref))
669 return -EAGAIN;
670 /* existing entry found */
671 encap = old;
672 } else {
673 if (em_type == EFX_TC_EM_DIRECT) {
674 rc = efx_mae_register_encap_match(efx, encap);
675 if (rc) {
676 NL_SET_ERR_MSG_MOD(extack, "Failed to record egress encap match in HW");
677 goto fail;
678 }
679 }
680 refcount_set(&encap->ref, 1);
681 }
682 match->encap = encap;
683 return 0;
684fail:
685 rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
686 efx_tc_encap_match_ht_params);
687 kfree(encap);
688fail_pseudo:
689 if (pseudo)
690 efx_tc_flower_release_encap_match(efx, pseudo);
691 return rc;
692}
693
694static struct efx_tc_recirc_id *efx_tc_get_recirc_id(struct efx_nic *efx,
695 u32 chain_index,
696 struct net_device *net_dev)
697{
698 struct efx_tc_recirc_id *rid, *old;
699 int rc;
700
701 rid = kzalloc(sizeof(*rid), GFP_USER);
702 if (!rid)
703 return ERR_PTR(-ENOMEM);
704 rid->chain_index = chain_index;
705 /* We don't take a reference here, because it's implied - if there's
706 * a rule on the net_dev that's been offloaded to us, then the net_dev
707 * can't go away until the rule has been deoffloaded.
708 */
709 rid->net_dev = net_dev;
710 old = rhashtable_lookup_get_insert_fast(&efx->tc->recirc_ht,
711 &rid->linkage,
712 efx_tc_recirc_ht_params);
713 if (old) {
714 /* don't need our new entry */
715 kfree(rid);
716 if (IS_ERR(old)) /* oh dear, it's actually an error */
717 return ERR_CAST(old);
718 if (!refcount_inc_not_zero(&old->ref))
719 return ERR_PTR(-EAGAIN);
720 /* existing entry found */
721 rid = old;
722 } else {
723 rc = ida_alloc_range(&efx->tc->recirc_ida, 1, U8_MAX, GFP_USER);
724 if (rc < 0) {
725 rhashtable_remove_fast(&efx->tc->recirc_ht,
726 &rid->linkage,
727 efx_tc_recirc_ht_params);
728 kfree(rid);
729 return ERR_PTR(rc);
730 }
731 rid->fw_id = rc;
732 refcount_set(&rid->ref, 1);
733 }
734 return rid;
735}
736
737static void efx_tc_put_recirc_id(struct efx_nic *efx, struct efx_tc_recirc_id *rid)
738{
739 if (!refcount_dec_and_test(&rid->ref))
740 return; /* still in use */
741 rhashtable_remove_fast(&efx->tc->recirc_ht, &rid->linkage,
742 efx_tc_recirc_ht_params);
743 ida_free(&efx->tc->recirc_ida, rid->fw_id);
744 kfree(rid);
745}
746
747static void efx_tc_delete_rule(struct efx_nic *efx, struct efx_tc_flow_rule *rule)
748{
749 efx_mae_delete_rule(efx, rule->fw_id);
750
751 /* Release entries in subsidiary tables */
752 efx_tc_free_action_set_list(efx, &rule->acts, true);
753 if (rule->match.rid)
754 efx_tc_put_recirc_id(efx, rule->match.rid);
755 if (rule->match.encap)
756 efx_tc_flower_release_encap_match(efx, rule->match.encap);
757 rule->fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
758}
759
760static const char *efx_tc_encap_type_name(enum efx_encap_type typ)
761{
762 switch (typ) {
763 case EFX_ENCAP_TYPE_NONE:
764 return "none";
765 case EFX_ENCAP_TYPE_VXLAN:
766 return "vxlan";
767 case EFX_ENCAP_TYPE_GENEVE:
768 return "geneve";
769 default:
770 pr_warn_once("Unknown efx_encap_type %d encountered\n", typ);
771 return "unknown";
772 }
773}
774
775/* For details of action order constraints refer to SF-123102-TC-1§12.6.1 */
776enum efx_tc_action_order {
777 EFX_TC_AO_DECAP,
778 EFX_TC_AO_DEC_TTL,
779 EFX_TC_AO_PEDIT_MAC_ADDRS,
780 EFX_TC_AO_VLAN_POP,
781 EFX_TC_AO_VLAN_PUSH,
782 EFX_TC_AO_COUNT,
783 EFX_TC_AO_ENCAP,
784 EFX_TC_AO_DELIVER
785};
786/* Determine whether we can add @new action without violating order */
787static bool efx_tc_flower_action_order_ok(const struct efx_tc_action_set *act,
788 enum efx_tc_action_order new)
789{
790 switch (new) {
791 case EFX_TC_AO_DECAP:
792 if (act->decap)
793 return false;
794 /* PEDIT_MAC_ADDRS must not happen before DECAP, though it
795 * can wait until much later
796 */
797 if (act->dst_mac || act->src_mac)
798 return false;
799
800 /* Decrementing ttl must not happen before DECAP */
801 if (act->do_ttl_dec)
802 return false;
803 fallthrough;
804 case EFX_TC_AO_VLAN_POP:
805 if (act->vlan_pop >= 2)
806 return false;
807 /* If we've already pushed a VLAN, we can't then pop it;
808 * the hardware would instead try to pop an existing VLAN
809 * before pushing the new one.
810 */
811 if (act->vlan_push)
812 return false;
813 fallthrough;
814 case EFX_TC_AO_VLAN_PUSH:
815 if (act->vlan_push >= 2)
816 return false;
817 fallthrough;
818 case EFX_TC_AO_COUNT:
819 if (act->count)
820 return false;
821 fallthrough;
822 case EFX_TC_AO_PEDIT_MAC_ADDRS:
823 case EFX_TC_AO_ENCAP:
824 if (act->encap_md)
825 return false;
826 fallthrough;
827 case EFX_TC_AO_DELIVER:
828 return !act->deliver;
829 case EFX_TC_AO_DEC_TTL:
830 if (act->encap_md)
831 return false;
832 return !act->do_ttl_dec;
833 default:
834 /* Bad caller. Whatever they wanted to do, say they can't. */
835 WARN_ON_ONCE(1);
836 return false;
837 }
838}
839
840/**
841 * DOC: TC conntrack sequences
842 *
843 * The MAE hardware can handle at most two rounds of action rule matching,
844 * consequently we support conntrack through the notion of a "left-hand side
845 * rule". This is a rule which typically contains only the actions "ct" and
846 * "goto chain N", and corresponds to one or more "right-hand side rules" in
847 * chain N, which typically match on +trk+est, and may perform ct(nat) actions.
848 * RHS rules go in the Action Rule table as normal but with a nonzero recirc_id
849 * (the hardware equivalent of chain_index), while LHS rules may go in either
850 * the Action Rule or the Outer Rule table, the latter being preferred for
851 * performance reasons, and set both DO_CT and a recirc_id in their response.
852 *
853 * Besides the RHS rules, there are often also similar rules matching on
854 * +trk+new which perform the ct(commit) action. These are not offloaded.
855 */
856
857static bool efx_tc_rule_is_lhs_rule(struct flow_rule *fr,
858 struct efx_tc_match *match)
859{
860 const struct flow_action_entry *fa;
861 int i;
862
863 flow_action_for_each(i, fa, &fr->action) {
864 switch (fa->id) {
865 case FLOW_ACTION_GOTO:
866 return true;
867 case FLOW_ACTION_CT:
868 /* If rule is -trk, or doesn't mention trk at all, then
869 * a CT action implies a conntrack lookup (hence it's an
870 * LHS rule). If rule is +trk, then a CT action could
871 * just be ct(nat) or even ct(commit) (though the latter
872 * can't be offloaded).
873 */
874 if (!match->mask.ct_state_trk || !match->value.ct_state_trk)
875 return true;
876 break;
877 default:
878 break;
879 }
880 }
881 return false;
882}
883
884/* A foreign LHS rule has matches on enc_ keys at the TC layer (including an
885 * implied match on enc_ip_proto UDP). Translate these into non-enc_ keys,
886 * so that we can use the same MAE machinery as local LHS rules (and so that
887 * the lhs_rules entries have uniform semantics). It may seem odd to do it
888 * this way round, given that the corresponding fields in the MAE MCDIs are
889 * all ENC_, but (a) we don't have enc_L2 or enc_ip_proto in struct
890 * efx_tc_match_fields and (b) semantically an LHS rule doesn't have inner
891 * fields so it's just matching on *the* header rather than the outer header.
892 * Make sure that the non-enc_ keys were not already being matched on, as that
893 * would imply a rule that needed a triple lookup. (Hardware can do that,
894 * with OR-AR-CT-AR, but it halves packet rate so we avoid it where possible;
895 * see efx_tc_flower_flhs_needs_ar().)
896 */
897static int efx_tc_flower_translate_flhs_match(struct efx_tc_match *match)
898{
899 int rc = 0;
900
901#define COPY_MASK_AND_VALUE(_key, _ekey) ({ \
902 if (match->mask._key) { \
903 rc = -EOPNOTSUPP; \
904 } else { \
905 match->mask._key = match->mask._ekey; \
906 match->mask._ekey = 0; \
907 match->value._key = match->value._ekey; \
908 match->value._ekey = 0; \
909 } \
910 rc; \
911})
912#define COPY_FROM_ENC(_key) COPY_MASK_AND_VALUE(_key, enc_##_key)
913 if (match->mask.ip_proto)
914 return -EOPNOTSUPP;
915 match->mask.ip_proto = ~0;
916 match->value.ip_proto = IPPROTO_UDP;
917 if (COPY_FROM_ENC(src_ip) || COPY_FROM_ENC(dst_ip))
918 return rc;
919#ifdef CONFIG_IPV6
920 if (!ipv6_addr_any(&match->mask.src_ip6))
921 return -EOPNOTSUPP;
922 match->mask.src_ip6 = match->mask.enc_src_ip6;
923 memset(&match->mask.enc_src_ip6, 0, sizeof(struct in6_addr));
924 if (!ipv6_addr_any(&match->mask.dst_ip6))
925 return -EOPNOTSUPP;
926 match->mask.dst_ip6 = match->mask.enc_dst_ip6;
927 memset(&match->mask.enc_dst_ip6, 0, sizeof(struct in6_addr));
928#endif
929 if (COPY_FROM_ENC(ip_tos) || COPY_FROM_ENC(ip_ttl))
930 return rc;
931 /* should really copy enc_ip_frag but we don't have that in
932 * parse_match yet
933 */
934 if (COPY_MASK_AND_VALUE(l4_sport, enc_sport) ||
935 COPY_MASK_AND_VALUE(l4_dport, enc_dport))
936 return rc;
937 return 0;
938#undef COPY_FROM_ENC
939#undef COPY_MASK_AND_VALUE
940}
941
942/* If a foreign LHS rule wants to match on keys that are only available after
943 * encap header identification and parsing, then it can't be done in the Outer
944 * Rule lookup, because that lookup determines the encap type used to parse
945 * beyond the outer headers. Thus, such rules must use the OR-AR-CT-AR lookup
946 * sequence, with an EM (struct efx_tc_encap_match) in the OR step.
947 * Return true iff the passed match requires this.
948 */
949static bool efx_tc_flower_flhs_needs_ar(struct efx_tc_match *match)
950{
951 /* matches on inner-header keys can't be done in OR */
952 return match->mask.eth_proto ||
953 match->mask.vlan_tci[0] || match->mask.vlan_tci[1] ||
954 match->mask.vlan_proto[0] || match->mask.vlan_proto[1] ||
955 memchr_inv(match->mask.eth_saddr, 0, ETH_ALEN) ||
956 memchr_inv(match->mask.eth_daddr, 0, ETH_ALEN) ||
957 match->mask.ip_proto ||
958 match->mask.ip_tos || match->mask.ip_ttl ||
959 match->mask.src_ip || match->mask.dst_ip ||
960#ifdef CONFIG_IPV6
961 !ipv6_addr_any(&match->mask.src_ip6) ||
962 !ipv6_addr_any(&match->mask.dst_ip6) ||
963#endif
964 match->mask.ip_frag || match->mask.ip_firstfrag ||
965 match->mask.l4_sport || match->mask.l4_dport ||
966 match->mask.tcp_flags ||
967 /* nor can VNI */
968 match->mask.enc_keyid;
969}
970
971static int efx_tc_flower_handle_lhs_actions(struct efx_nic *efx,
972 struct flow_cls_offload *tc,
973 struct flow_rule *fr,
974 struct net_device *net_dev,
975 struct efx_tc_lhs_rule *rule)
976
977{
978 struct netlink_ext_ack *extack = tc->common.extack;
979 struct efx_tc_lhs_action *act = &rule->lhs_act;
980 const struct flow_action_entry *fa;
981 enum efx_tc_counter_type ctype;
982 bool pipe = true;
983 int i;
984
985 ctype = rule->is_ar ? EFX_TC_COUNTER_TYPE_AR : EFX_TC_COUNTER_TYPE_OR;
986
987 flow_action_for_each(i, fa, &fr->action) {
988 struct efx_tc_ct_zone *ct_zone;
989 struct efx_tc_recirc_id *rid;
990
991 if (!pipe) {
992 /* more actions after a non-pipe action */
993 NL_SET_ERR_MSG_MOD(extack, "Action follows non-pipe action");
994 return -EINVAL;
995 }
996 switch (fa->id) {
997 case FLOW_ACTION_GOTO:
998 if (!fa->chain_index) {
999 NL_SET_ERR_MSG_MOD(extack, "Can't goto chain 0, no looping in hw");
1000 return -EOPNOTSUPP;
1001 }
1002 rid = efx_tc_get_recirc_id(efx, fa->chain_index,
1003 net_dev);
1004 if (IS_ERR(rid)) {
1005 NL_SET_ERR_MSG_MOD(extack, "Failed to allocate a hardware recirculation ID for this chain_index");
1006 return PTR_ERR(rid);
1007 }
1008 act->rid = rid;
1009 if (fa->hw_stats) {
1010 struct efx_tc_counter_index *cnt;
1011
1012 if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
1013 NL_SET_ERR_MSG_FMT_MOD(extack,
1014 "hw_stats_type %u not supported (only 'delayed')",
1015 fa->hw_stats);
1016 return -EOPNOTSUPP;
1017 }
1018 cnt = efx_tc_flower_get_counter_index(efx, tc->cookie,
1019 ctype);
1020 if (IS_ERR(cnt)) {
1021 NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
1022 return PTR_ERR(cnt);
1023 }
1024 WARN_ON(act->count); /* can't happen */
1025 act->count = cnt;
1026 }
1027 pipe = false;
1028 break;
1029 case FLOW_ACTION_CT:
1030 if (act->zone) {
1031 NL_SET_ERR_MSG_MOD(extack, "Can't offload multiple ct actions");
1032 return -EOPNOTSUPP;
1033 }
1034 if (fa->ct.action & (TCA_CT_ACT_COMMIT |
1035 TCA_CT_ACT_FORCE)) {
1036 NL_SET_ERR_MSG_MOD(extack, "Can't offload ct commit/force");
1037 return -EOPNOTSUPP;
1038 }
1039 if (fa->ct.action & TCA_CT_ACT_CLEAR) {
1040 NL_SET_ERR_MSG_MOD(extack, "Can't clear ct in LHS rule");
1041 return -EOPNOTSUPP;
1042 }
1043 if (fa->ct.action & (TCA_CT_ACT_NAT |
1044 TCA_CT_ACT_NAT_SRC |
1045 TCA_CT_ACT_NAT_DST)) {
1046 NL_SET_ERR_MSG_MOD(extack, "Can't perform NAT in LHS rule - packet isn't conntracked yet");
1047 return -EOPNOTSUPP;
1048 }
1049 if (fa->ct.action) {
1050 NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled ct.action %u for LHS rule\n",
1051 fa->ct.action);
1052 return -EOPNOTSUPP;
1053 }
1054 ct_zone = efx_tc_ct_register_zone(efx, fa->ct.zone,
1055 fa->ct.flow_table);
1056 if (IS_ERR(ct_zone)) {
1057 NL_SET_ERR_MSG_MOD(extack, "Failed to register for CT updates");
1058 return PTR_ERR(ct_zone);
1059 }
1060 act->zone = ct_zone;
1061 break;
1062 default:
1063 NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u for LHS rule\n",
1064 fa->id);
1065 return -EOPNOTSUPP;
1066 }
1067 }
1068
1069 if (pipe) {
1070 NL_SET_ERR_MSG_MOD(extack, "Missing goto chain in LHS rule");
1071 return -EOPNOTSUPP;
1072 }
1073 return 0;
1074}
1075
1076static void efx_tc_flower_release_lhs_actions(struct efx_nic *efx,
1077 struct efx_tc_lhs_action *act)
1078{
1079 if (act->rid)
1080 efx_tc_put_recirc_id(efx, act->rid);
1081 if (act->zone)
1082 efx_tc_ct_unregister_zone(efx, act->zone);
1083 if (act->count)
1084 efx_tc_flower_put_counter_index(efx, act->count);
1085}
1086
1087/**
1088 * struct efx_tc_mangler_state - accumulates 32-bit pedits into fields
1089 *
1090 * @dst_mac_32: dst_mac[0:3] has been populated
1091 * @dst_mac_16: dst_mac[4:5] has been populated
1092 * @src_mac_16: src_mac[0:1] has been populated
1093 * @src_mac_32: src_mac[2:5] has been populated
1094 * @dst_mac: h_dest field of ethhdr
1095 * @src_mac: h_source field of ethhdr
1096 *
1097 * Since FLOW_ACTION_MANGLE comes in 32-bit chunks that do not
1098 * necessarily equate to whole fields of the packet header, this
1099 * structure is used to hold the cumulative effect of the partial
1100 * field pedits that have been processed so far.
1101 */
1102struct efx_tc_mangler_state {
1103 u8 dst_mac_32:1; /* eth->h_dest[0:3] */
1104 u8 dst_mac_16:1; /* eth->h_dest[4:5] */
1105 u8 src_mac_16:1; /* eth->h_source[0:1] */
1106 u8 src_mac_32:1; /* eth->h_source[2:5] */
1107 unsigned char dst_mac[ETH_ALEN];
1108 unsigned char src_mac[ETH_ALEN];
1109};
1110
1111/** efx_tc_complete_mac_mangle() - pull complete field pedits out of @mung
1112 * @efx: NIC we're installing a flow rule on
1113 * @act: action set (cursor) to update
1114 * @mung: accumulated partial mangles
1115 * @extack: netlink extended ack for reporting errors
1116 *
1117 * Check @mung to find any combinations of partial mangles that can be
1118 * combined into a complete packet field edit, add that edit to @act,
1119 * and consume the partial mangles from @mung.
1120 */
1121
1122static int efx_tc_complete_mac_mangle(struct efx_nic *efx,
1123 struct efx_tc_action_set *act,
1124 struct efx_tc_mangler_state *mung,
1125 struct netlink_ext_ack *extack)
1126{
1127 struct efx_tc_mac_pedit_action *ped;
1128
1129 if (mung->dst_mac_32 && mung->dst_mac_16) {
1130 ped = efx_tc_flower_get_mac(efx, mung->dst_mac, extack);
1131 if (IS_ERR(ped))
1132 return PTR_ERR(ped);
1133
1134 /* Check that we have not already populated dst_mac */
1135 if (act->dst_mac)
1136 efx_tc_flower_put_mac(efx, act->dst_mac);
1137
1138 act->dst_mac = ped;
1139
1140 /* consume the incomplete state */
1141 mung->dst_mac_32 = 0;
1142 mung->dst_mac_16 = 0;
1143 }
1144 if (mung->src_mac_16 && mung->src_mac_32) {
1145 ped = efx_tc_flower_get_mac(efx, mung->src_mac, extack);
1146 if (IS_ERR(ped))
1147 return PTR_ERR(ped);
1148
1149 /* Check that we have not already populated src_mac */
1150 if (act->src_mac)
1151 efx_tc_flower_put_mac(efx, act->src_mac);
1152
1153 act->src_mac = ped;
1154
1155 /* consume the incomplete state */
1156 mung->src_mac_32 = 0;
1157 mung->src_mac_16 = 0;
1158 }
1159 return 0;
1160}
1161
1162static int efx_tc_pedit_add(struct efx_nic *efx, struct efx_tc_action_set *act,
1163 const struct flow_action_entry *fa,
1164 struct netlink_ext_ack *extack)
1165{
1166 switch (fa->mangle.htype) {
1167 case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
1168 switch (fa->mangle.offset) {
1169 case offsetof(struct iphdr, ttl):
1170 /* check that pedit applies to ttl only */
1171 if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK)
1172 break;
1173
1174 /* Adding 0xff is equivalent to decrementing the ttl.
1175 * Other added values are not supported.
1176 */
1177 if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) != U8_MAX)
1178 break;
1179
1180 /* check that we do not decrement ttl twice */
1181 if (!efx_tc_flower_action_order_ok(act,
1182 EFX_TC_AO_DEC_TTL)) {
1183 NL_SET_ERR_MSG_MOD(extack, "multiple dec ttl are not supported");
1184 return -EOPNOTSUPP;
1185 }
1186 act->do_ttl_dec = 1;
1187 return 0;
1188 default:
1189 break;
1190 }
1191 break;
1192 case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
1193 switch (fa->mangle.offset) {
1194 case round_down(offsetof(struct ipv6hdr, hop_limit), 4):
1195 /* check that pedit applies to hoplimit only */
1196 if (fa->mangle.mask != EFX_TC_HDR_TYPE_HLIMIT_MASK)
1197 break;
1198
1199 /* Adding 0xff is equivalent to decrementing the hoplimit.
1200 * Other added values are not supported.
1201 */
1202 if ((fa->mangle.val >> 24) != U8_MAX)
1203 break;
1204
1205 /* check that we do not decrement hoplimit twice */
1206 if (!efx_tc_flower_action_order_ok(act,
1207 EFX_TC_AO_DEC_TTL)) {
1208 NL_SET_ERR_MSG_MOD(extack, "multiple dec ttl are not supported");
1209 return -EOPNOTSUPP;
1210 }
1211 act->do_ttl_dec = 1;
1212 return 0;
1213 default:
1214 break;
1215 }
1216 break;
1217 default:
1218 break;
1219 }
1220
1221 NL_SET_ERR_MSG_FMT_MOD(extack,
1222 "ttl add action type %x %x %x/%x is not supported",
1223 fa->mangle.htype, fa->mangle.offset,
1224 fa->mangle.val, fa->mangle.mask);
1225 return -EOPNOTSUPP;
1226}
1227
1228/**
1229 * efx_tc_mangle() - handle a single 32-bit (or less) pedit
1230 * @efx: NIC we're installing a flow rule on
1231 * @act: action set (cursor) to update
1232 * @fa: FLOW_ACTION_MANGLE action metadata
1233 * @mung: accumulator for partial mangles
1234 * @extack: netlink extended ack for reporting errors
1235 * @match: original match used along with the mangle action
1236 *
1237 * Identify the fields written by a FLOW_ACTION_MANGLE, and record
1238 * the partial mangle state in @mung. If this mangle completes an
1239 * earlier partial mangle, consume and apply to @act by calling
1240 * efx_tc_complete_mac_mangle().
1241 */
1242
1243static int efx_tc_mangle(struct efx_nic *efx, struct efx_tc_action_set *act,
1244 const struct flow_action_entry *fa,
1245 struct efx_tc_mangler_state *mung,
1246 struct netlink_ext_ack *extack,
1247 struct efx_tc_match *match)
1248{
1249 __le32 mac32;
1250 __le16 mac16;
1251 u8 tr_ttl;
1252
1253 switch (fa->mangle.htype) {
1254 case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
1255 BUILD_BUG_ON(offsetof(struct ethhdr, h_dest) != 0);
1256 BUILD_BUG_ON(offsetof(struct ethhdr, h_source) != 6);
1257 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_PEDIT_MAC_ADDRS)) {
1258 NL_SET_ERR_MSG_MOD(extack,
1259 "Pedit mangle mac action violates action order");
1260 return -EOPNOTSUPP;
1261 }
1262 switch (fa->mangle.offset) {
1263 case 0:
1264 if (fa->mangle.mask) {
1265 NL_SET_ERR_MSG_FMT_MOD(extack,
1266 "mask (%#x) of eth.dst32 mangle is not supported",
1267 fa->mangle.mask);
1268 return -EOPNOTSUPP;
1269 }
1270 /* Ethernet address is little-endian */
1271 mac32 = cpu_to_le32(fa->mangle.val);
1272 memcpy(mung->dst_mac, &mac32, sizeof(mac32));
1273 mung->dst_mac_32 = 1;
1274 return efx_tc_complete_mac_mangle(efx, act, mung, extack);
1275 case 4:
1276 if (fa->mangle.mask == 0xffff) {
1277 mac16 = cpu_to_le16(fa->mangle.val >> 16);
1278 memcpy(mung->src_mac, &mac16, sizeof(mac16));
1279 mung->src_mac_16 = 1;
1280 } else if (fa->mangle.mask == 0xffff0000) {
1281 mac16 = cpu_to_le16((u16)fa->mangle.val);
1282 memcpy(mung->dst_mac + 4, &mac16, sizeof(mac16));
1283 mung->dst_mac_16 = 1;
1284 } else {
1285 NL_SET_ERR_MSG_FMT_MOD(extack,
1286 "mask (%#x) of eth+4 mangle is not high or low 16b",
1287 fa->mangle.mask);
1288 return -EOPNOTSUPP;
1289 }
1290 return efx_tc_complete_mac_mangle(efx, act, mung, extack);
1291 case 8:
1292 if (fa->mangle.mask) {
1293 NL_SET_ERR_MSG_FMT_MOD(extack,
1294 "mask (%#x) of eth.src32 mangle is not supported",
1295 fa->mangle.mask);
1296 return -EOPNOTSUPP;
1297 }
1298 mac32 = cpu_to_le32(fa->mangle.val);
1299 memcpy(mung->src_mac + 2, &mac32, sizeof(mac32));
1300 mung->src_mac_32 = 1;
1301 return efx_tc_complete_mac_mangle(efx, act, mung, extack);
1302 default:
1303 NL_SET_ERR_MSG_FMT_MOD(extack, "mangle eth+%u %x/%x is not supported",
1304 fa->mangle.offset, fa->mangle.val, fa->mangle.mask);
1305 return -EOPNOTSUPP;
1306 }
1307 break;
1308 case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
1309 switch (fa->mangle.offset) {
1310 case offsetof(struct iphdr, ttl):
1311 /* we currently only support pedit IP4 when it applies
1312 * to TTL and then only when it can be achieved with a
1313 * decrement ttl action
1314 */
1315
1316 /* check that pedit applies to ttl only */
1317 if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK) {
1318 NL_SET_ERR_MSG_FMT_MOD(extack,
1319 "mask (%#x) out of range, only support mangle action on ipv4.ttl",
1320 fa->mangle.mask);
1321 return -EOPNOTSUPP;
1322 }
1323
1324 /* we can only convert to a dec ttl when we have an
1325 * exact match on the ttl field
1326 */
1327 if (match->mask.ip_ttl != U8_MAX) {
1328 NL_SET_ERR_MSG_FMT_MOD(extack,
1329 "only support mangle ttl when we have an exact match, current mask (%#x)",
1330 match->mask.ip_ttl);
1331 return -EOPNOTSUPP;
1332 }
1333
1334 /* check that we don't try to decrement 0, which equates
1335 * to setting the ttl to 0xff
1336 */
1337 if (match->value.ip_ttl == 0) {
1338 NL_SET_ERR_MSG_MOD(extack,
1339 "decrement ttl past 0 is not supported");
1340 return -EOPNOTSUPP;
1341 }
1342
1343 /* check that we do not decrement ttl twice */
1344 if (!efx_tc_flower_action_order_ok(act,
1345 EFX_TC_AO_DEC_TTL)) {
1346 NL_SET_ERR_MSG_MOD(extack,
1347 "multiple dec ttl is not supported");
1348 return -EOPNOTSUPP;
1349 }
1350
1351 /* check pedit can be achieved with decrement action */
1352 tr_ttl = match->value.ip_ttl - 1;
1353 if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) == tr_ttl) {
1354 act->do_ttl_dec = 1;
1355 return 0;
1356 }
1357
1358 fallthrough;
1359 default:
1360 NL_SET_ERR_MSG_FMT_MOD(extack,
1361 "only support mangle on the ttl field (offset is %u)",
1362 fa->mangle.offset);
1363 return -EOPNOTSUPP;
1364 }
1365 break;
1366 case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
1367 switch (fa->mangle.offset) {
1368 case round_down(offsetof(struct ipv6hdr, hop_limit), 4):
1369 /* we currently only support pedit IP6 when it applies
1370 * to the hoplimit and then only when it can be achieved
1371 * with a decrement hoplimit action
1372 */
1373
1374 /* check that pedit applies to ttl only */
1375 if (fa->mangle.mask != EFX_TC_HDR_TYPE_HLIMIT_MASK) {
1376 NL_SET_ERR_MSG_FMT_MOD(extack,
1377 "mask (%#x) out of range, only support mangle action on ipv6.hop_limit",
1378 fa->mangle.mask);
1379
1380 return -EOPNOTSUPP;
1381 }
1382
1383 /* we can only convert to a dec ttl when we have an
1384 * exact match on the ttl field
1385 */
1386 if (match->mask.ip_ttl != U8_MAX) {
1387 NL_SET_ERR_MSG_FMT_MOD(extack,
1388 "only support hop_limit when we have an exact match, current mask (%#x)",
1389 match->mask.ip_ttl);
1390 return -EOPNOTSUPP;
1391 }
1392
1393 /* check that we don't try to decrement 0, which equates
1394 * to setting the ttl to 0xff
1395 */
1396 if (match->value.ip_ttl == 0) {
1397 NL_SET_ERR_MSG_MOD(extack,
1398 "decrementing hop_limit past 0 is not supported");
1399 return -EOPNOTSUPP;
1400 }
1401
1402 /* check that we do not decrement hoplimit twice */
1403 if (!efx_tc_flower_action_order_ok(act,
1404 EFX_TC_AO_DEC_TTL)) {
1405 NL_SET_ERR_MSG_MOD(extack,
1406 "multiple dec ttl is not supported");
1407 return -EOPNOTSUPP;
1408 }
1409
1410 /* check pedit can be achieved with decrement action */
1411 tr_ttl = match->value.ip_ttl - 1;
1412 if ((fa->mangle.val >> 24) == tr_ttl) {
1413 act->do_ttl_dec = 1;
1414 return 0;
1415 }
1416
1417 fallthrough;
1418 default:
1419 NL_SET_ERR_MSG_FMT_MOD(extack,
1420 "only support mangle on the hop_limit field");
1421 return -EOPNOTSUPP;
1422 }
1423 default:
1424 NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled mangle htype %u for action rule",
1425 fa->mangle.htype);
1426 return -EOPNOTSUPP;
1427 }
1428 return 0;
1429}
1430
1431/**
1432 * efx_tc_incomplete_mangle() - check for leftover partial pedits
1433 * @mung: accumulator for partial mangles
1434 * @extack: netlink extended ack for reporting errors
1435 *
1436 * Since the MAE can only overwrite whole fields, any partial
1437 * field mangle left over on reaching packet delivery (mirred or
1438 * end of TC actions) cannot be offloaded. Check for any such
1439 * and reject them with -%EOPNOTSUPP.
1440 */
1441
1442static int efx_tc_incomplete_mangle(struct efx_tc_mangler_state *mung,
1443 struct netlink_ext_ack *extack)
1444{
1445 if (mung->dst_mac_32 || mung->dst_mac_16) {
1446 NL_SET_ERR_MSG_MOD(extack, "Incomplete pedit of destination MAC address");
1447 return -EOPNOTSUPP;
1448 }
1449 if (mung->src_mac_16 || mung->src_mac_32) {
1450 NL_SET_ERR_MSG_MOD(extack, "Incomplete pedit of source MAC address");
1451 return -EOPNOTSUPP;
1452 }
1453 return 0;
1454}
1455
1456static int efx_tc_flower_replace_foreign_lhs_ar(struct efx_nic *efx,
1457 struct flow_cls_offload *tc,
1458 struct flow_rule *fr,
1459 struct efx_tc_match *match,
1460 struct net_device *net_dev)
1461{
1462 struct netlink_ext_ack *extack = tc->common.extack;
1463 struct efx_tc_lhs_rule *rule, *old;
1464 enum efx_encap_type type;
1465 int rc;
1466
1467 type = efx_tc_indr_netdev_type(net_dev);
1468 if (type == EFX_ENCAP_TYPE_NONE) {
1469 NL_SET_ERR_MSG_MOD(extack, "Egress encap match on unsupported tunnel device");
1470 return -EOPNOTSUPP;
1471 }
1472
1473 rc = efx_mae_check_encap_type_supported(efx, type);
1474 if (rc) {
1475 NL_SET_ERR_MSG_FMT_MOD(extack,
1476 "Firmware reports no support for %s encap match",
1477 efx_tc_encap_type_name(type));
1478 return rc;
1479 }
1480 /* This is an Action Rule, so it needs a separate Encap Match in the
1481 * Outer Rule table. Insert that now.
1482 */
1483 rc = efx_tc_flower_record_encap_match(efx, match, type,
1484 EFX_TC_EM_DIRECT, 0, 0, extack);
1485 if (rc)
1486 return rc;
1487
1488 match->mask.recirc_id = 0xff;
1489 if (match->mask.ct_state_trk && match->value.ct_state_trk) {
1490 NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
1491 rc = -EOPNOTSUPP;
1492 goto release_encap_match;
1493 }
1494 /* LHS rules are always -trk, so we don't need to match on that */
1495 match->mask.ct_state_trk = 0;
1496 match->value.ct_state_trk = 0;
1497 /* We must inhibit match on TCP SYN/FIN/RST, so that SW can see
1498 * the packet and update the conntrack table.
1499 * Outer Rules will do that with CT_TCP_FLAGS_INHIBIT, but Action
1500 * Rules don't have that; instead they support matching on
1501 * TCP_SYN_FIN_RST (aka TCP_INTERESTING_FLAGS), so use that.
1502 * This is only strictly needed if there will be a DO_CT action,
1503 * which we don't know yet, but typically there will be and it's
1504 * simpler not to bother checking here.
1505 */
1506 match->mask.tcp_syn_fin_rst = true;
1507
1508 rc = efx_mae_match_check_caps(efx, &match->mask, extack);
1509 if (rc)
1510 goto release_encap_match;
1511
1512 rule = kzalloc(sizeof(*rule), GFP_USER);
1513 if (!rule) {
1514 rc = -ENOMEM;
1515 goto release_encap_match;
1516 }
1517 rule->cookie = tc->cookie;
1518 rule->is_ar = true;
1519 old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
1520 &rule->linkage,
1521 efx_tc_lhs_rule_ht_params);
1522 if (old) {
1523 netif_dbg(efx, drv, efx->net_dev,
1524 "Already offloaded rule (cookie %lx)\n", tc->cookie);
1525 rc = -EEXIST;
1526 NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
1527 goto release;
1528 }
1529
1530 /* Parse actions */
1531 rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, net_dev, rule);
1532 if (rc)
1533 goto release;
1534
1535 rule->match = *match;
1536 rule->lhs_act.tun_type = type;
1537
1538 rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
1539 if (rc) {
1540 NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
1541 goto release;
1542 }
1543 netif_dbg(efx, drv, efx->net_dev,
1544 "Successfully parsed lhs rule (cookie %lx)\n",
1545 tc->cookie);
1546 return 0;
1547
1548release:
1549 efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
1550 if (!old)
1551 rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
1552 efx_tc_lhs_rule_ht_params);
1553 kfree(rule);
1554release_encap_match:
1555 if (match->encap)
1556 efx_tc_flower_release_encap_match(efx, match->encap);
1557 return rc;
1558}
1559
1560static int efx_tc_flower_replace_foreign_lhs(struct efx_nic *efx,
1561 struct flow_cls_offload *tc,
1562 struct flow_rule *fr,
1563 struct efx_tc_match *match,
1564 struct net_device *net_dev)
1565{
1566 struct netlink_ext_ack *extack = tc->common.extack;
1567 struct efx_tc_lhs_rule *rule, *old;
1568 enum efx_encap_type type;
1569 int rc;
1570
1571 if (tc->common.chain_index) {
1572 NL_SET_ERR_MSG_MOD(extack, "LHS rule only allowed in chain 0");
1573 return -EOPNOTSUPP;
1574 }
1575
1576 if (!efx_tc_match_is_encap(&match->mask)) {
1577 /* This is not a tunnel decap rule, ignore it */
1578 netif_dbg(efx, drv, efx->net_dev, "Ignoring foreign LHS filter without encap match\n");
1579 return -EOPNOTSUPP;
1580 }
1581
1582 if (efx_tc_flower_flhs_needs_ar(match))
1583 return efx_tc_flower_replace_foreign_lhs_ar(efx, tc, fr, match,
1584 net_dev);
1585
1586 type = efx_tc_indr_netdev_type(net_dev);
1587 if (type == EFX_ENCAP_TYPE_NONE) {
1588 NL_SET_ERR_MSG_MOD(extack, "Egress encap match on unsupported tunnel device\n");
1589 return -EOPNOTSUPP;
1590 }
1591
1592 rc = efx_mae_check_encap_type_supported(efx, type);
1593 if (rc) {
1594 NL_SET_ERR_MSG_FMT_MOD(extack,
1595 "Firmware reports no support for %s encap match",
1596 efx_tc_encap_type_name(type));
1597 return rc;
1598 }
1599 /* Reserve the outer tuple with a pseudo Encap Match */
1600 rc = efx_tc_flower_record_encap_match(efx, match, type,
1601 EFX_TC_EM_PSEUDO_OR, 0, 0,
1602 extack);
1603 if (rc)
1604 return rc;
1605
1606 if (match->mask.ct_state_trk && match->value.ct_state_trk) {
1607 NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
1608 rc = -EOPNOTSUPP;
1609 goto release_encap_match;
1610 }
1611 /* LHS rules are always -trk, so we don't need to match on that */
1612 match->mask.ct_state_trk = 0;
1613 match->value.ct_state_trk = 0;
1614
1615 rc = efx_tc_flower_translate_flhs_match(match);
1616 if (rc) {
1617 NL_SET_ERR_MSG_MOD(extack, "LHS rule cannot match on inner fields");
1618 goto release_encap_match;
1619 }
1620
1621 rc = efx_mae_match_check_caps_lhs(efx, &match->mask, extack);
1622 if (rc)
1623 goto release_encap_match;
1624
1625 rule = kzalloc(sizeof(*rule), GFP_USER);
1626 if (!rule) {
1627 rc = -ENOMEM;
1628 goto release_encap_match;
1629 }
1630 rule->cookie = tc->cookie;
1631 old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
1632 &rule->linkage,
1633 efx_tc_lhs_rule_ht_params);
1634 if (old) {
1635 netif_dbg(efx, drv, efx->net_dev,
1636 "Already offloaded rule (cookie %lx)\n", tc->cookie);
1637 rc = -EEXIST;
1638 NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
1639 goto release;
1640 }
1641
1642 /* Parse actions */
1643 rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, net_dev, rule);
1644 if (rc)
1645 goto release;
1646
1647 rule->match = *match;
1648 rule->lhs_act.tun_type = type;
1649
1650 rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
1651 if (rc) {
1652 NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
1653 goto release;
1654 }
1655 netif_dbg(efx, drv, efx->net_dev,
1656 "Successfully parsed lhs rule (cookie %lx)\n",
1657 tc->cookie);
1658 return 0;
1659
1660release:
1661 efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
1662 if (!old)
1663 rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
1664 efx_tc_lhs_rule_ht_params);
1665 kfree(rule);
1666release_encap_match:
1667 if (match->encap)
1668 efx_tc_flower_release_encap_match(efx, match->encap);
1669 return rc;
1670}
1671
1672static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
1673 struct net_device *net_dev,
1674 struct flow_cls_offload *tc)
1675{
1676 struct flow_rule *fr = flow_cls_offload_flow_rule(tc);
1677 struct netlink_ext_ack *extack = tc->common.extack;
1678 struct efx_tc_flow_rule *rule = NULL, *old = NULL;
1679 struct efx_tc_action_set *act = NULL;
1680 bool found = false, uplinked = false;
1681 const struct flow_action_entry *fa;
1682 struct efx_tc_match match;
1683 struct efx_rep *to_efv;
1684 s64 rc;
1685 int i;
1686
1687 /* Parse match */
1688 memset(&match, 0, sizeof(match));
1689 rc = efx_tc_flower_parse_match(efx, fr, &match, extack);
1690 if (rc)
1691 return rc;
1692 /* The rule as given to us doesn't specify a source netdevice.
1693 * But, determining whether packets from a VF should match it is
1694 * complicated, so leave those to the software slowpath: qualify
1695 * the filter with source m-port == wire.
1696 */
1697 rc = efx_tc_flower_external_mport(efx, EFX_EFV_PF);
1698 if (rc < 0) {
1699 NL_SET_ERR_MSG_MOD(extack, "Failed to identify ingress m-port for foreign filter");
1700 return rc;
1701 }
1702 match.value.ingress_port = rc;
1703 match.mask.ingress_port = ~0;
1704
1705 if (efx_tc_rule_is_lhs_rule(fr, &match))
1706 return efx_tc_flower_replace_foreign_lhs(efx, tc, fr, &match,
1707 net_dev);
1708
1709 if (tc->common.chain_index) {
1710 struct efx_tc_recirc_id *rid;
1711
1712 rid = efx_tc_get_recirc_id(efx, tc->common.chain_index, net_dev);
1713 if (IS_ERR(rid)) {
1714 NL_SET_ERR_MSG_FMT_MOD(extack,
1715 "Failed to allocate a hardware recirculation ID for chain_index %u",
1716 tc->common.chain_index);
1717 return PTR_ERR(rid);
1718 }
1719 match.rid = rid;
1720 match.value.recirc_id = rid->fw_id;
1721 }
1722 match.mask.recirc_id = 0xff;
1723
1724 /* AR table can't match on DO_CT (+trk). But a commonly used pattern is
1725 * +trk+est, which is strictly implied by +est, so rewrite it to that.
1726 */
1727 if (match.mask.ct_state_trk && match.value.ct_state_trk &&
1728 match.mask.ct_state_est && match.value.ct_state_est)
1729 match.mask.ct_state_trk = 0;
1730 /* Thanks to CT_TCP_FLAGS_INHIBIT, packets with interesting flags could
1731 * match +trk-est (CT_HIT=0) despite being on an established connection.
1732 * So make -est imply -tcp_syn_fin_rst match to ensure these packets
1733 * still hit the software path.
1734 */
1735 if (match.mask.ct_state_est && !match.value.ct_state_est) {
1736 if (match.value.tcp_syn_fin_rst) {
1737 /* Can't offload this combination */
1738 NL_SET_ERR_MSG_MOD(extack, "TCP flags and -est conflict for offload");
1739 rc = -EOPNOTSUPP;
1740 goto release;
1741 }
1742 match.mask.tcp_syn_fin_rst = true;
1743 }
1744
1745 flow_action_for_each(i, fa, &fr->action) {
1746 switch (fa->id) {
1747 case FLOW_ACTION_REDIRECT:
1748 case FLOW_ACTION_MIRRED: /* mirred means mirror here */
1749 to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
1750 if (IS_ERR(to_efv))
1751 continue;
1752 found = true;
1753 break;
1754 default:
1755 break;
1756 }
1757 }
1758 if (!found) { /* We don't care. */
1759 netif_dbg(efx, drv, efx->net_dev,
1760 "Ignoring foreign filter that doesn't egdev us\n");
1761 rc = -EOPNOTSUPP;
1762 goto release;
1763 }
1764
1765 rc = efx_mae_match_check_caps(efx, &match.mask, extack);
1766 if (rc)
1767 goto release;
1768
1769 if (efx_tc_match_is_encap(&match.mask)) {
1770 enum efx_encap_type type;
1771
1772 type = efx_tc_indr_netdev_type(net_dev);
1773 if (type == EFX_ENCAP_TYPE_NONE) {
1774 NL_SET_ERR_MSG_MOD(extack,
1775 "Egress encap match on unsupported tunnel device");
1776 rc = -EOPNOTSUPP;
1777 goto release;
1778 }
1779
1780 rc = efx_mae_check_encap_type_supported(efx, type);
1781 if (rc) {
1782 NL_SET_ERR_MSG_FMT_MOD(extack,
1783 "Firmware reports no support for %s encap match",
1784 efx_tc_encap_type_name(type));
1785 goto release;
1786 }
1787
1788 rc = efx_tc_flower_record_encap_match(efx, &match, type,
1789 EFX_TC_EM_DIRECT, 0, 0,
1790 extack);
1791 if (rc)
1792 goto release;
1793 } else if (!tc->common.chain_index) {
1794 /* This is not a tunnel decap rule, ignore it */
1795 netif_dbg(efx, drv, efx->net_dev,
1796 "Ignoring foreign filter without encap match\n");
1797 rc = -EOPNOTSUPP;
1798 goto release;
1799 }
1800
1801 rule = kzalloc(sizeof(*rule), GFP_USER);
1802 if (!rule) {
1803 rc = -ENOMEM;
1804 goto release;
1805 }
1806 INIT_LIST_HEAD(&rule->acts.list);
1807 rule->cookie = tc->cookie;
1808 old = rhashtable_lookup_get_insert_fast(&efx->tc->match_action_ht,
1809 &rule->linkage,
1810 efx_tc_match_action_ht_params);
1811 if (IS_ERR(old)) {
1812 rc = PTR_ERR(old);
1813 goto release;
1814 } else if (old) {
1815 netif_dbg(efx, drv, efx->net_dev,
1816 "Ignoring already-offloaded rule (cookie %lx)\n",
1817 tc->cookie);
1818 rc = -EEXIST;
1819 goto release;
1820 }
1821
1822 act = kzalloc(sizeof(*act), GFP_USER);
1823 if (!act) {
1824 rc = -ENOMEM;
1825 goto release;
1826 }
1827
1828 /* Parse actions. For foreign rules we only support decap & redirect.
1829 * See corresponding code in efx_tc_flower_replace() for theory of
1830 * operation & how 'act' cursor is used.
1831 */
1832 flow_action_for_each(i, fa, &fr->action) {
1833 struct efx_tc_action_set save;
1834
1835 switch (fa->id) {
1836 case FLOW_ACTION_REDIRECT:
1837 case FLOW_ACTION_MIRRED:
1838 /* See corresponding code in efx_tc_flower_replace() for
1839 * long explanations of what's going on here.
1840 */
1841 save = *act;
1842 if (fa->hw_stats) {
1843 struct efx_tc_counter_index *ctr;
1844
1845 if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
1846 NL_SET_ERR_MSG_FMT_MOD(extack,
1847 "hw_stats_type %u not supported (only 'delayed')",
1848 fa->hw_stats);
1849 rc = -EOPNOTSUPP;
1850 goto release;
1851 }
1852 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_COUNT)) {
1853 NL_SET_ERR_MSG_MOD(extack, "Count action violates action order (can't happen)");
1854 rc = -EOPNOTSUPP;
1855 goto release;
1856 }
1857
1858 ctr = efx_tc_flower_get_counter_index(efx,
1859 tc->cookie,
1860 EFX_TC_COUNTER_TYPE_AR);
1861 if (IS_ERR(ctr)) {
1862 rc = PTR_ERR(ctr);
1863 NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
1864 goto release;
1865 }
1866 act->count = ctr;
1867 INIT_LIST_HEAD(&act->count_user);
1868 }
1869
1870 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DELIVER)) {
1871 /* can't happen */
1872 rc = -EOPNOTSUPP;
1873 NL_SET_ERR_MSG_MOD(extack,
1874 "Deliver action violates action order (can't happen)");
1875 goto release;
1876 }
1877 to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
1878 /* PF implies egdev is us, in which case we really
1879 * want to deliver to the uplink (because this is an
1880 * ingress filter). If we don't recognise the egdev
1881 * at all, then we'd better trap so SW can handle it.
1882 */
1883 if (IS_ERR(to_efv))
1884 to_efv = EFX_EFV_PF;
1885 if (to_efv == EFX_EFV_PF) {
1886 if (uplinked)
1887 break;
1888 uplinked = true;
1889 }
1890 rc = efx_tc_flower_internal_mport(efx, to_efv);
1891 if (rc < 0) {
1892 NL_SET_ERR_MSG_MOD(extack, "Failed to identify egress m-port");
1893 goto release;
1894 }
1895 act->dest_mport = rc;
1896 act->deliver = 1;
1897 rc = efx_mae_alloc_action_set(efx, act);
1898 if (rc) {
1899 NL_SET_ERR_MSG_MOD(extack,
1900 "Failed to write action set to hw (mirred)");
1901 goto release;
1902 }
1903 list_add_tail(&act->list, &rule->acts.list);
1904 act = NULL;
1905 if (fa->id == FLOW_ACTION_REDIRECT)
1906 break; /* end of the line */
1907 /* Mirror, so continue on with saved act */
1908 act = kzalloc(sizeof(*act), GFP_USER);
1909 if (!act) {
1910 rc = -ENOMEM;
1911 goto release;
1912 }
1913 *act = save;
1914 break;
1915 case FLOW_ACTION_TUNNEL_DECAP:
1916 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DECAP)) {
1917 rc = -EINVAL;
1918 NL_SET_ERR_MSG_MOD(extack, "Decap action violates action order");
1919 goto release;
1920 }
1921 act->decap = 1;
1922 /* If we previously delivered/trapped to uplink, now
1923 * that we've decapped we'll want another copy if we
1924 * try to deliver/trap to uplink again.
1925 */
1926 uplinked = false;
1927 break;
1928 default:
1929 NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u",
1930 fa->id);
1931 rc = -EOPNOTSUPP;
1932 goto release;
1933 }
1934 }
1935
1936 if (act) {
1937 if (!uplinked) {
1938 /* Not shot/redirected, so deliver to default dest (which is
1939 * the uplink, as this is an ingress filter)
1940 */
1941 efx_mae_mport_uplink(efx, &act->dest_mport);
1942 act->deliver = 1;
1943 }
1944 rc = efx_mae_alloc_action_set(efx, act);
1945 if (rc) {
1946 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (deliver)");
1947 goto release;
1948 }
1949 list_add_tail(&act->list, &rule->acts.list);
1950 act = NULL; /* Prevent double-free in error path */
1951 }
1952
1953 rule->match = match;
1954
1955 netif_dbg(efx, drv, efx->net_dev,
1956 "Successfully parsed foreign filter (cookie %lx)\n",
1957 tc->cookie);
1958
1959 rc = efx_mae_alloc_action_set_list(efx, &rule->acts);
1960 if (rc) {
1961 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set list to hw");
1962 goto release;
1963 }
1964 rc = efx_mae_insert_rule(efx, &rule->match, EFX_TC_PRIO_TC,
1965 rule->acts.fw_id, &rule->fw_id);
1966 if (rc) {
1967 NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
1968 goto release_acts;
1969 }
1970 return 0;
1971
1972release_acts:
1973 efx_mae_free_action_set_list(efx, &rule->acts);
1974release:
1975 /* We failed to insert the rule, so free up any entries we created in
1976 * subsidiary tables.
1977 */
1978 if (match.rid)
1979 efx_tc_put_recirc_id(efx, match.rid);
1980 if (act)
1981 efx_tc_free_action_set(efx, act, false);
1982 if (rule) {
1983 if (!old)
1984 rhashtable_remove_fast(&efx->tc->match_action_ht,
1985 &rule->linkage,
1986 efx_tc_match_action_ht_params);
1987 efx_tc_free_action_set_list(efx, &rule->acts, false);
1988 }
1989 kfree(rule);
1990 if (match.encap)
1991 efx_tc_flower_release_encap_match(efx, match.encap);
1992 return rc;
1993}
1994
1995static int efx_tc_flower_replace_lhs(struct efx_nic *efx,
1996 struct flow_cls_offload *tc,
1997 struct flow_rule *fr,
1998 struct efx_tc_match *match,
1999 struct efx_rep *efv,
2000 struct net_device *net_dev)
2001{
2002 struct netlink_ext_ack *extack = tc->common.extack;
2003 struct efx_tc_lhs_rule *rule, *old;
2004 int rc;
2005
2006 if (tc->common.chain_index) {
2007 NL_SET_ERR_MSG_MOD(extack, "LHS rule only allowed in chain 0");
2008 return -EOPNOTSUPP;
2009 }
2010
2011 if (match->mask.ct_state_trk && match->value.ct_state_trk) {
2012 NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
2013 return -EOPNOTSUPP;
2014 }
2015 /* LHS rules are always -trk, so we don't need to match on that */
2016 match->mask.ct_state_trk = 0;
2017 match->value.ct_state_trk = 0;
2018
2019 rc = efx_mae_match_check_caps_lhs(efx, &match->mask, extack);
2020 if (rc)
2021 return rc;
2022
2023 rule = kzalloc(sizeof(*rule), GFP_USER);
2024 if (!rule)
2025 return -ENOMEM;
2026 rule->cookie = tc->cookie;
2027 old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
2028 &rule->linkage,
2029 efx_tc_lhs_rule_ht_params);
2030 if (IS_ERR(old)) {
2031 rc = PTR_ERR(old);
2032 goto release;
2033 } else if (old) {
2034 netif_dbg(efx, drv, efx->net_dev,
2035 "Already offloaded rule (cookie %lx)\n", tc->cookie);
2036 rc = -EEXIST;
2037 NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
2038 goto release;
2039 }
2040
2041 /* Parse actions */
2042 /* See note in efx_tc_flower_replace() regarding passed net_dev
2043 * (used for efx_tc_get_recirc_id()).
2044 */
2045 rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, efx->net_dev, rule);
2046 if (rc)
2047 goto release;
2048
2049 rule->match = *match;
2050
2051 rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
2052 if (rc) {
2053 NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
2054 goto release;
2055 }
2056 netif_dbg(efx, drv, efx->net_dev,
2057 "Successfully parsed lhs rule (cookie %lx)\n",
2058 tc->cookie);
2059 return 0;
2060
2061release:
2062 efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
2063 if (!old)
2064 rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
2065 efx_tc_lhs_rule_ht_params);
2066 kfree(rule);
2067 return rc;
2068}
2069
2070static int efx_tc_flower_replace(struct efx_nic *efx,
2071 struct net_device *net_dev,
2072 struct flow_cls_offload *tc,
2073 struct efx_rep *efv)
2074{
2075 struct flow_rule *fr = flow_cls_offload_flow_rule(tc);
2076 struct netlink_ext_ack *extack = tc->common.extack;
2077 const struct ip_tunnel_info *encap_info = NULL;
2078 struct efx_tc_flow_rule *rule = NULL, *old;
2079 struct efx_tc_mangler_state mung = {};
2080 struct efx_tc_action_set *act = NULL;
2081 const struct flow_action_entry *fa;
2082 struct efx_rep *from_efv, *to_efv;
2083 struct efx_tc_match match;
2084 u32 acts_id;
2085 s64 rc;
2086 int i;
2087
2088 if (!tc_can_offload_extack(efx->net_dev, extack))
2089 return -EOPNOTSUPP;
2090 if (WARN_ON(!efx->tc))
2091 return -ENETDOWN;
2092 if (WARN_ON(!efx->tc->up))
2093 return -ENETDOWN;
2094
2095 from_efv = efx_tc_flower_lookup_efv(efx, net_dev);
2096 if (IS_ERR(from_efv)) {
2097 /* Not from our PF or representors, so probably a tunnel dev */
2098 return efx_tc_flower_replace_foreign(efx, net_dev, tc);
2099 }
2100
2101 if (efv != from_efv) {
2102 /* can't happen */
2103 NL_SET_ERR_MSG_FMT_MOD(extack, "for %s efv is %snull but from_efv is %snull (can't happen)",
2104 netdev_name(net_dev), efv ? "non-" : "",
2105 from_efv ? "non-" : "");
2106 return -EINVAL;
2107 }
2108
2109 /* Parse match */
2110 memset(&match, 0, sizeof(match));
2111 rc = efx_tc_flower_external_mport(efx, from_efv);
2112 if (rc < 0) {
2113 NL_SET_ERR_MSG_MOD(extack, "Failed to identify ingress m-port");
2114 return rc;
2115 }
2116 match.value.ingress_port = rc;
2117 match.mask.ingress_port = ~0;
2118 rc = efx_tc_flower_parse_match(efx, fr, &match, extack);
2119 if (rc)
2120 return rc;
2121 if (efx_tc_match_is_encap(&match.mask)) {
2122 NL_SET_ERR_MSG_MOD(extack, "Ingress enc_key matches not supported");
2123 return -EOPNOTSUPP;
2124 }
2125
2126 if (efx_tc_rule_is_lhs_rule(fr, &match))
2127 return efx_tc_flower_replace_lhs(efx, tc, fr, &match, efv,
2128 net_dev);
2129
2130 /* chain_index 0 is always recirc_id 0 (and does not appear in recirc_ht).
2131 * Conveniently, match.rid == NULL and match.value.recirc_id == 0 owing
2132 * to the initial memset(), so we don't need to do anything in that case.
2133 */
2134 if (tc->common.chain_index) {
2135 struct efx_tc_recirc_id *rid;
2136
2137 /* Note regarding passed net_dev:
2138 * VFreps and PF can share chain namespace, as they have
2139 * distinct ingress_mports. So we don't need to burn an
2140 * extra recirc_id if both use the same chain_index.
2141 * (Strictly speaking, we could give each VFrep its own
2142 * recirc_id namespace that doesn't take IDs away from the
2143 * PF, but that would require a bunch of additional IDAs -
2144 * one for each representor - and that's not likely to be
2145 * the main cause of recirc_id exhaustion anyway.)
2146 */
2147 rid = efx_tc_get_recirc_id(efx, tc->common.chain_index,
2148 efx->net_dev);
2149 if (IS_ERR(rid)) {
2150 NL_SET_ERR_MSG_FMT_MOD(extack,
2151 "Failed to allocate a hardware recirculation ID for chain_index %u",
2152 tc->common.chain_index);
2153 return PTR_ERR(rid);
2154 }
2155 match.rid = rid;
2156 match.value.recirc_id = rid->fw_id;
2157 }
2158 match.mask.recirc_id = 0xff;
2159
2160 /* AR table can't match on DO_CT (+trk). But a commonly used pattern is
2161 * +trk+est, which is strictly implied by +est, so rewrite it to that.
2162 */
2163 if (match.mask.ct_state_trk && match.value.ct_state_trk &&
2164 match.mask.ct_state_est && match.value.ct_state_est)
2165 match.mask.ct_state_trk = 0;
2166 /* Thanks to CT_TCP_FLAGS_INHIBIT, packets with interesting flags could
2167 * match +trk-est (CT_HIT=0) despite being on an established connection.
2168 * So make -est imply -tcp_syn_fin_rst match to ensure these packets
2169 * still hit the software path.
2170 */
2171 if (match.mask.ct_state_est && !match.value.ct_state_est) {
2172 if (match.value.tcp_syn_fin_rst) {
2173 /* Can't offload this combination */
2174 rc = -EOPNOTSUPP;
2175 goto release;
2176 }
2177 match.mask.tcp_syn_fin_rst = true;
2178 }
2179
2180 rc = efx_mae_match_check_caps(efx, &match.mask, extack);
2181 if (rc)
2182 goto release;
2183
2184 rule = kzalloc(sizeof(*rule), GFP_USER);
2185 if (!rule) {
2186 rc = -ENOMEM;
2187 goto release;
2188 }
2189 INIT_LIST_HEAD(&rule->acts.list);
2190 rule->cookie = tc->cookie;
2191 old = rhashtable_lookup_get_insert_fast(&efx->tc->match_action_ht,
2192 &rule->linkage,
2193 efx_tc_match_action_ht_params);
2194 if (IS_ERR(old)) {
2195 rc = PTR_ERR(old);
2196 goto release;
2197 } else if (old) {
2198 netif_dbg(efx, drv, efx->net_dev,
2199 "Already offloaded rule (cookie %lx)\n", tc->cookie);
2200 NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
2201 rc = -EEXIST;
2202 goto release;
2203 }
2204
2205 /* Parse actions */
2206 act = kzalloc(sizeof(*act), GFP_USER);
2207 if (!act) {
2208 rc = -ENOMEM;
2209 goto release;
2210 }
2211
2212 /**
2213 * DOC: TC action translation
2214 *
2215 * Actions in TC are sequential and cumulative, with delivery actions
2216 * potentially anywhere in the order. The EF100 MAE, however, takes
2217 * an 'action set list' consisting of 'action sets', each of which is
2218 * applied to the _original_ packet, and consists of a set of optional
2219 * actions in a fixed order with delivery at the end.
2220 * To translate between these two models, we maintain a 'cursor', @act,
2221 * which describes the cumulative effect of all the packet-mutating
2222 * actions encountered so far; on handling a delivery (mirred or drop)
2223 * action, once the action-set has been inserted into hardware, we
2224 * append @act to the action-set list (@rule->acts); if this is a pipe
2225 * action (mirred mirror) we then allocate a new @act with a copy of
2226 * the cursor state _before_ the delivery action, otherwise we set @act
2227 * to %NULL.
2228 * This ensures that every allocated action-set is either attached to
2229 * @rule->acts or pointed to by @act (and never both), and that only
2230 * those action-sets in @rule->acts exist in hardware. Consequently,
2231 * in the failure path, @act only needs to be freed in memory, whereas
2232 * for @rule->acts we remove each action-set from hardware before
2233 * freeing it (efx_tc_free_action_set_list()), even if the action-set
2234 * list itself is not in hardware.
2235 */
2236 flow_action_for_each(i, fa, &fr->action) {
2237 struct efx_tc_action_set save;
2238 u16 tci;
2239
2240 if (!act) {
2241 /* more actions after a non-pipe action */
2242 NL_SET_ERR_MSG_MOD(extack, "Action follows non-pipe action");
2243 rc = -EINVAL;
2244 goto release;
2245 }
2246
2247 if ((fa->id == FLOW_ACTION_REDIRECT ||
2248 fa->id == FLOW_ACTION_MIRRED ||
2249 fa->id == FLOW_ACTION_DROP) && fa->hw_stats) {
2250 struct efx_tc_counter_index *ctr;
2251
2252 /* Currently the only actions that want stats are
2253 * mirred and gact (ok, shot, trap, goto-chain), which
2254 * means we want stats just before delivery. Also,
2255 * note that tunnel_key set shouldn't change the length
2256 * — it's only the subsequent mirred that does that,
2257 * and the stats are taken _before_ the mirred action
2258 * happens.
2259 */
2260 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_COUNT)) {
2261 /* All supported actions that count either steal
2262 * (gact shot, mirred redirect) or clone act
2263 * (mirred mirror), so we should never get two
2264 * count actions on one action_set.
2265 */
2266 NL_SET_ERR_MSG_MOD(extack, "Count-action conflict (can't happen)");
2267 rc = -EOPNOTSUPP;
2268 goto release;
2269 }
2270
2271 if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
2272 NL_SET_ERR_MSG_FMT_MOD(extack, "hw_stats_type %u not supported (only 'delayed')",
2273 fa->hw_stats);
2274 rc = -EOPNOTSUPP;
2275 goto release;
2276 }
2277
2278 ctr = efx_tc_flower_get_counter_index(efx, tc->cookie,
2279 EFX_TC_COUNTER_TYPE_AR);
2280 if (IS_ERR(ctr)) {
2281 rc = PTR_ERR(ctr);
2282 NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
2283 goto release;
2284 }
2285 act->count = ctr;
2286 INIT_LIST_HEAD(&act->count_user);
2287 }
2288
2289 switch (fa->id) {
2290 case FLOW_ACTION_DROP:
2291 rc = efx_mae_alloc_action_set(efx, act);
2292 if (rc) {
2293 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (drop)");
2294 goto release;
2295 }
2296 list_add_tail(&act->list, &rule->acts.list);
2297 act = NULL; /* end of the line */
2298 break;
2299 case FLOW_ACTION_REDIRECT:
2300 case FLOW_ACTION_MIRRED:
2301 save = *act;
2302
2303 if (encap_info) {
2304 struct efx_tc_encap_action *encap;
2305
2306 if (!efx_tc_flower_action_order_ok(act,
2307 EFX_TC_AO_ENCAP)) {
2308 rc = -EOPNOTSUPP;
2309 NL_SET_ERR_MSG_MOD(extack, "Encap action violates action order");
2310 goto release;
2311 }
2312 encap = efx_tc_flower_create_encap_md(
2313 efx, encap_info, fa->dev, extack);
2314 if (IS_ERR_OR_NULL(encap)) {
2315 rc = PTR_ERR(encap);
2316 if (!rc)
2317 rc = -EIO; /* arbitrary */
2318 goto release;
2319 }
2320 act->encap_md = encap;
2321 list_add_tail(&act->encap_user, &encap->users);
2322 act->dest_mport = encap->dest_mport;
2323 act->deliver = 1;
2324 if (act->count && !WARN_ON(!act->count->cnt)) {
2325 /* This counter is used by an encap
2326 * action, which needs a reference back
2327 * so it can prod neighbouring whenever
2328 * traffic is seen.
2329 */
2330 spin_lock_bh(&act->count->cnt->lock);
2331 list_add_tail(&act->count_user,
2332 &act->count->cnt->users);
2333 spin_unlock_bh(&act->count->cnt->lock);
2334 }
2335 rc = efx_mae_alloc_action_set(efx, act);
2336 if (rc) {
2337 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (encap)");
2338 goto release;
2339 }
2340 list_add_tail(&act->list, &rule->acts.list);
2341 act->user = &rule->acts;
2342 act = NULL;
2343 if (fa->id == FLOW_ACTION_REDIRECT)
2344 break; /* end of the line */
2345 /* Mirror, so continue on with saved act */
2346 save.count = NULL;
2347 act = kzalloc(sizeof(*act), GFP_USER);
2348 if (!act) {
2349 rc = -ENOMEM;
2350 goto release;
2351 }
2352 *act = save;
2353 break;
2354 }
2355
2356 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DELIVER)) {
2357 /* can't happen */
2358 rc = -EOPNOTSUPP;
2359 NL_SET_ERR_MSG_MOD(extack, "Deliver action violates action order (can't happen)");
2360 goto release;
2361 }
2362
2363 to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
2364 if (IS_ERR(to_efv)) {
2365 NL_SET_ERR_MSG_MOD(extack, "Mirred egress device not on switch");
2366 rc = PTR_ERR(to_efv);
2367 goto release;
2368 }
2369 rc = efx_tc_flower_external_mport(efx, to_efv);
2370 if (rc < 0) {
2371 NL_SET_ERR_MSG_MOD(extack, "Failed to identify egress m-port");
2372 goto release;
2373 }
2374 act->dest_mport = rc;
2375 act->deliver = 1;
2376 rc = efx_mae_alloc_action_set(efx, act);
2377 if (rc) {
2378 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (mirred)");
2379 goto release;
2380 }
2381 list_add_tail(&act->list, &rule->acts.list);
2382 act = NULL;
2383 if (fa->id == FLOW_ACTION_REDIRECT)
2384 break; /* end of the line */
2385 /* Mirror, so continue on with saved act */
2386 save.count = NULL;
2387 act = kzalloc(sizeof(*act), GFP_USER);
2388 if (!act) {
2389 rc = -ENOMEM;
2390 goto release;
2391 }
2392 *act = save;
2393 break;
2394 case FLOW_ACTION_VLAN_POP:
2395 if (act->vlan_push) {
2396 act->vlan_push--;
2397 } else if (efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_POP)) {
2398 act->vlan_pop++;
2399 } else {
2400 NL_SET_ERR_MSG_MOD(extack,
2401 "More than two VLAN pops, or action order violated");
2402 rc = -EINVAL;
2403 goto release;
2404 }
2405 break;
2406 case FLOW_ACTION_VLAN_PUSH:
2407 if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_PUSH)) {
2408 rc = -EINVAL;
2409 NL_SET_ERR_MSG_MOD(extack,
2410 "More than two VLAN pushes, or action order violated");
2411 goto release;
2412 }
2413 tci = fa->vlan.vid & VLAN_VID_MASK;
2414 tci |= fa->vlan.prio << VLAN_PRIO_SHIFT;
2415 act->vlan_tci[act->vlan_push] = cpu_to_be16(tci);
2416 act->vlan_proto[act->vlan_push] = fa->vlan.proto;
2417 act->vlan_push++;
2418 break;
2419 case FLOW_ACTION_ADD:
2420 rc = efx_tc_pedit_add(efx, act, fa, extack);
2421 if (rc < 0)
2422 goto release;
2423 break;
2424 case FLOW_ACTION_MANGLE:
2425 rc = efx_tc_mangle(efx, act, fa, &mung, extack, &match);
2426 if (rc < 0)
2427 goto release;
2428 break;
2429 case FLOW_ACTION_TUNNEL_ENCAP:
2430 if (encap_info) {
2431 /* Can't specify encap multiple times.
2432 * If you want to overwrite an existing
2433 * encap_info, use an intervening
2434 * FLOW_ACTION_TUNNEL_DECAP to clear it.
2435 */
2436 NL_SET_ERR_MSG_MOD(extack, "Tunnel key set when already set");
2437 rc = -EINVAL;
2438 goto release;
2439 }
2440 if (!fa->tunnel) {
2441 NL_SET_ERR_MSG_MOD(extack, "Tunnel key set is missing key");
2442 rc = -EOPNOTSUPP;
2443 goto release;
2444 }
2445 encap_info = fa->tunnel;
2446 break;
2447 case FLOW_ACTION_TUNNEL_DECAP:
2448 if (encap_info) {
2449 encap_info = NULL;
2450 break;
2451 }
2452 /* Since we don't support enc_key matches on ingress
2453 * (and if we did there'd be no tunnel-device to give
2454 * us a type), we can't offload a decap that's not
2455 * just undoing a previous encap action.
2456 */
2457 NL_SET_ERR_MSG_MOD(extack, "Cannot offload tunnel decap action without tunnel device");
2458 rc = -EOPNOTSUPP;
2459 goto release;
2460 case FLOW_ACTION_CT:
2461 if (fa->ct.action != TCA_CT_ACT_NAT) {
2462 rc = -EOPNOTSUPP;
2463 NL_SET_ERR_MSG_FMT_MOD(extack, "Can only offload CT 'nat' action in RHS rules, not %d", fa->ct.action);
2464 goto release;
2465 }
2466 act->do_nat = 1;
2467 break;
2468 default:
2469 NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u",
2470 fa->id);
2471 rc = -EOPNOTSUPP;
2472 goto release;
2473 }
2474 }
2475
2476 rc = efx_tc_incomplete_mangle(&mung, extack);
2477 if (rc < 0)
2478 goto release;
2479 if (act) {
2480 /* Not shot/redirected, so deliver to default dest */
2481 if (from_efv == EFX_EFV_PF)
2482 /* Rule applies to traffic from the wire,
2483 * and default dest is thus the PF
2484 */
2485 efx_mae_mport_uplink(efx, &act->dest_mport);
2486 else
2487 /* Representor, so rule applies to traffic from
2488 * representee, and default dest is thus the rep.
2489 * All reps use the same mport for delivery
2490 */
2491 efx_mae_mport_mport(efx, efx->tc->reps_mport_id,
2492 &act->dest_mport);
2493 act->deliver = 1;
2494 rc = efx_mae_alloc_action_set(efx, act);
2495 if (rc) {
2496 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (deliver)");
2497 goto release;
2498 }
2499 list_add_tail(&act->list, &rule->acts.list);
2500 act = NULL; /* Prevent double-free in error path */
2501 }
2502
2503 netif_dbg(efx, drv, efx->net_dev,
2504 "Successfully parsed filter (cookie %lx)\n",
2505 tc->cookie);
2506
2507 rule->match = match;
2508
2509 rc = efx_mae_alloc_action_set_list(efx, &rule->acts);
2510 if (rc) {
2511 NL_SET_ERR_MSG_MOD(extack, "Failed to write action set list to hw");
2512 goto release;
2513 }
2514 if (from_efv == EFX_EFV_PF)
2515 /* PF netdev, so rule applies to traffic from wire */
2516 rule->fallback = &efx->tc->facts.pf;
2517 else
2518 /* repdev, so rule applies to traffic from representee */
2519 rule->fallback = &efx->tc->facts.reps;
2520 if (!efx_tc_check_ready(efx, rule)) {
2521 netif_dbg(efx, drv, efx->net_dev, "action not ready for hw\n");
2522 acts_id = rule->fallback->fw_id;
2523 } else {
2524 netif_dbg(efx, drv, efx->net_dev, "ready for hw\n");
2525 acts_id = rule->acts.fw_id;
2526 }
2527 rc = efx_mae_insert_rule(efx, &rule->match, EFX_TC_PRIO_TC,
2528 acts_id, &rule->fw_id);
2529 if (rc) {
2530 NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
2531 goto release_acts;
2532 }
2533 return 0;
2534
2535release_acts:
2536 efx_mae_free_action_set_list(efx, &rule->acts);
2537release:
2538 /* We failed to insert the rule, so free up any entries we created in
2539 * subsidiary tables.
2540 */
2541 if (match.rid)
2542 efx_tc_put_recirc_id(efx, match.rid);
2543 if (act)
2544 efx_tc_free_action_set(efx, act, false);
2545 if (rule) {
2546 if (!old)
2547 rhashtable_remove_fast(&efx->tc->match_action_ht,
2548 &rule->linkage,
2549 efx_tc_match_action_ht_params);
2550 efx_tc_free_action_set_list(efx, &rule->acts, false);
2551 }
2552 kfree(rule);
2553 return rc;
2554}
2555
2556static int efx_tc_flower_destroy(struct efx_nic *efx,
2557 struct net_device *net_dev,
2558 struct flow_cls_offload *tc)
2559{
2560 struct netlink_ext_ack *extack = tc->common.extack;
2561 struct efx_tc_lhs_rule *lhs_rule;
2562 struct efx_tc_flow_rule *rule;
2563
2564 lhs_rule = rhashtable_lookup_fast(&efx->tc->lhs_rule_ht, &tc->cookie,
2565 efx_tc_lhs_rule_ht_params);
2566 if (lhs_rule) {
2567 /* Remove it from HW */
2568 efx_mae_remove_lhs_rule(efx, lhs_rule);
2569 /* Delete it from SW */
2570 efx_tc_flower_release_lhs_actions(efx, &lhs_rule->lhs_act);
2571 rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &lhs_rule->linkage,
2572 efx_tc_lhs_rule_ht_params);
2573 if (lhs_rule->match.encap)
2574 efx_tc_flower_release_encap_match(efx, lhs_rule->match.encap);
2575 netif_dbg(efx, drv, efx->net_dev, "Removed (lhs) filter %lx\n",
2576 lhs_rule->cookie);
2577 kfree(lhs_rule);
2578 return 0;
2579 }
2580
2581 rule = rhashtable_lookup_fast(&efx->tc->match_action_ht, &tc->cookie,
2582 efx_tc_match_action_ht_params);
2583 if (!rule) {
2584 /* Only log a message if we're the ingress device. Otherwise
2585 * it's a foreign filter and we might just not have been
2586 * interested (e.g. we might not have been the egress device
2587 * either).
2588 */
2589 if (!IS_ERR(efx_tc_flower_lookup_efv(efx, net_dev)))
2590 netif_warn(efx, drv, efx->net_dev,
2591 "Filter %lx not found to remove\n", tc->cookie);
2592 NL_SET_ERR_MSG_MOD(extack, "Flow cookie not found in offloaded rules");
2593 return -ENOENT;
2594 }
2595
2596 /* Remove it from HW */
2597 efx_tc_delete_rule(efx, rule);
2598 /* Delete it from SW */
2599 rhashtable_remove_fast(&efx->tc->match_action_ht, &rule->linkage,
2600 efx_tc_match_action_ht_params);
2601 netif_dbg(efx, drv, efx->net_dev, "Removed filter %lx\n", rule->cookie);
2602 kfree(rule);
2603 return 0;
2604}
2605
2606static int efx_tc_flower_stats(struct efx_nic *efx, struct net_device *net_dev,
2607 struct flow_cls_offload *tc)
2608{
2609 struct netlink_ext_ack *extack = tc->common.extack;
2610 struct efx_tc_counter_index *ctr;
2611 struct efx_tc_counter *cnt;
2612 u64 packets, bytes;
2613
2614 ctr = efx_tc_flower_find_counter_index(efx, tc->cookie);
2615 if (!ctr) {
2616 /* See comment in efx_tc_flower_destroy() */
2617 if (!IS_ERR(efx_tc_flower_lookup_efv(efx, net_dev)))
2618 if (net_ratelimit())
2619 netif_warn(efx, drv, efx->net_dev,
2620 "Filter %lx not found for stats\n",
2621 tc->cookie);
2622 NL_SET_ERR_MSG_MOD(extack, "Flow cookie not found in offloaded rules");
2623 return -ENOENT;
2624 }
2625 if (WARN_ON(!ctr->cnt)) /* can't happen */
2626 return -EIO;
2627 cnt = ctr->cnt;
2628
2629 spin_lock_bh(&cnt->lock);
2630 /* Report only new pkts/bytes since last time TC asked */
2631 packets = cnt->packets;
2632 bytes = cnt->bytes;
2633 flow_stats_update(&tc->stats, bytes - cnt->old_bytes,
2634 packets - cnt->old_packets, 0, cnt->touched,
2635 FLOW_ACTION_HW_STATS_DELAYED);
2636 cnt->old_packets = packets;
2637 cnt->old_bytes = bytes;
2638 spin_unlock_bh(&cnt->lock);
2639 return 0;
2640}
2641
2642int efx_tc_flower(struct efx_nic *efx, struct net_device *net_dev,
2643 struct flow_cls_offload *tc, struct efx_rep *efv)
2644{
2645 int rc;
2646
2647 if (!efx->tc)
2648 return -EOPNOTSUPP;
2649
2650 mutex_lock(&efx->tc->mutex);
2651 switch (tc->command) {
2652 case FLOW_CLS_REPLACE:
2653 rc = efx_tc_flower_replace(efx, net_dev, tc, efv);
2654 break;
2655 case FLOW_CLS_DESTROY:
2656 rc = efx_tc_flower_destroy(efx, net_dev, tc);
2657 break;
2658 case FLOW_CLS_STATS:
2659 rc = efx_tc_flower_stats(efx, net_dev, tc);
2660 break;
2661 default:
2662 rc = -EOPNOTSUPP;
2663 break;
2664 }
2665 mutex_unlock(&efx->tc->mutex);
2666 return rc;
2667}
2668
2669static int efx_tc_configure_default_rule(struct efx_nic *efx, u32 ing_port,
2670 u32 eg_port, struct efx_tc_flow_rule *rule)
2671{
2672 struct efx_tc_action_set_list *acts = &rule->acts;
2673 struct efx_tc_match *match = &rule->match;
2674 struct efx_tc_action_set *act;
2675 int rc;
2676
2677 match->value.ingress_port = ing_port;
2678 match->mask.ingress_port = ~0;
2679 act = kzalloc(sizeof(*act), GFP_KERNEL);
2680 if (!act)
2681 return -ENOMEM;
2682 act->deliver = 1;
2683 act->dest_mport = eg_port;
2684 rc = efx_mae_alloc_action_set(efx, act);
2685 if (rc)
2686 goto fail1;
2687 EFX_WARN_ON_PARANOID(!list_empty(&acts->list));
2688 list_add_tail(&act->list, &acts->list);
2689 rc = efx_mae_alloc_action_set_list(efx, acts);
2690 if (rc)
2691 goto fail2;
2692 rc = efx_mae_insert_rule(efx, match, EFX_TC_PRIO_DFLT,
2693 acts->fw_id, &rule->fw_id);
2694 if (rc)
2695 goto fail3;
2696 return 0;
2697fail3:
2698 efx_mae_free_action_set_list(efx, acts);
2699fail2:
2700 list_del(&act->list);
2701 efx_mae_free_action_set(efx, act->fw_id);
2702fail1:
2703 kfree(act);
2704 return rc;
2705}
2706
2707static int efx_tc_configure_default_rule_pf(struct efx_nic *efx)
2708{
2709 struct efx_tc_flow_rule *rule = &efx->tc->dflt.pf;
2710 u32 ing_port, eg_port;
2711
2712 efx_mae_mport_uplink(efx, &ing_port);
2713 efx_mae_mport_wire(efx, &eg_port);
2714 return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
2715}
2716
2717static int efx_tc_configure_default_rule_wire(struct efx_nic *efx)
2718{
2719 struct efx_tc_flow_rule *rule = &efx->tc->dflt.wire;
2720 u32 ing_port, eg_port;
2721
2722 efx_mae_mport_wire(efx, &ing_port);
2723 efx_mae_mport_uplink(efx, &eg_port);
2724 return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
2725}
2726
2727int efx_tc_configure_default_rule_rep(struct efx_rep *efv)
2728{
2729 struct efx_tc_flow_rule *rule = &efv->dflt;
2730 struct efx_nic *efx = efv->parent;
2731 u32 ing_port, eg_port;
2732
2733 efx_mae_mport_mport(efx, efv->mport, &ing_port);
2734 efx_mae_mport_mport(efx, efx->tc->reps_mport_id, &eg_port);
2735 return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
2736}
2737
2738void efx_tc_deconfigure_default_rule(struct efx_nic *efx,
2739 struct efx_tc_flow_rule *rule)
2740{
2741 if (rule->fw_id != MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL)
2742 efx_tc_delete_rule(efx, rule);
2743 rule->fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
2744}
2745
2746static int efx_tc_configure_fallback_acts(struct efx_nic *efx, u32 eg_port,
2747 struct efx_tc_action_set_list *acts)
2748{
2749 struct efx_tc_action_set *act;
2750 int rc;
2751
2752 act = kzalloc(sizeof(*act), GFP_KERNEL);
2753 if (!act)
2754 return -ENOMEM;
2755 act->deliver = 1;
2756 act->dest_mport = eg_port;
2757 rc = efx_mae_alloc_action_set(efx, act);
2758 if (rc)
2759 goto fail1;
2760 EFX_WARN_ON_PARANOID(!list_empty(&acts->list));
2761 list_add_tail(&act->list, &acts->list);
2762 rc = efx_mae_alloc_action_set_list(efx, acts);
2763 if (rc)
2764 goto fail2;
2765 return 0;
2766fail2:
2767 list_del(&act->list);
2768 efx_mae_free_action_set(efx, act->fw_id);
2769fail1:
2770 kfree(act);
2771 return rc;
2772}
2773
2774static int efx_tc_configure_fallback_acts_pf(struct efx_nic *efx)
2775{
2776 struct efx_tc_action_set_list *acts = &efx->tc->facts.pf;
2777 u32 eg_port;
2778
2779 efx_mae_mport_uplink(efx, &eg_port);
2780 return efx_tc_configure_fallback_acts(efx, eg_port, acts);
2781}
2782
2783static int efx_tc_configure_fallback_acts_reps(struct efx_nic *efx)
2784{
2785 struct efx_tc_action_set_list *acts = &efx->tc->facts.reps;
2786 u32 eg_port;
2787
2788 efx_mae_mport_mport(efx, efx->tc->reps_mport_id, &eg_port);
2789 return efx_tc_configure_fallback_acts(efx, eg_port, acts);
2790}
2791
2792static void efx_tc_deconfigure_fallback_acts(struct efx_nic *efx,
2793 struct efx_tc_action_set_list *acts)
2794{
2795 efx_tc_free_action_set_list(efx, acts, true);
2796}
2797
2798static int efx_tc_configure_rep_mport(struct efx_nic *efx)
2799{
2800 u32 rep_mport_label;
2801 int rc;
2802
2803 rc = efx_mae_allocate_mport(efx, &efx->tc->reps_mport_id, &rep_mport_label);
2804 if (rc)
2805 return rc;
2806 pci_dbg(efx->pci_dev, "created rep mport 0x%08x (0x%04x)\n",
2807 efx->tc->reps_mport_id, rep_mport_label);
2808 /* Use mport *selector* as vport ID */
2809 efx_mae_mport_mport(efx, efx->tc->reps_mport_id,
2810 &efx->tc->reps_mport_vport_id);
2811 return 0;
2812}
2813
2814static void efx_tc_deconfigure_rep_mport(struct efx_nic *efx)
2815{
2816 efx_mae_free_mport(efx, efx->tc->reps_mport_id);
2817 efx->tc->reps_mport_id = MAE_MPORT_SELECTOR_NULL;
2818}
2819
2820int efx_tc_insert_rep_filters(struct efx_nic *efx)
2821{
2822 struct efx_filter_spec promisc, allmulti;
2823 int rc;
2824
2825 if (efx->type->is_vf)
2826 return 0;
2827 if (!efx->tc)
2828 return 0;
2829 efx_filter_init_rx(&promisc, EFX_FILTER_PRI_REQUIRED, 0, 0);
2830 efx_filter_set_uc_def(&promisc);
2831 efx_filter_set_vport_id(&promisc, efx->tc->reps_mport_vport_id);
2832 rc = efx_filter_insert_filter(efx, &promisc, false);
2833 if (rc < 0)
2834 return rc;
2835 efx->tc->reps_filter_uc = rc;
2836 efx_filter_init_rx(&allmulti, EFX_FILTER_PRI_REQUIRED, 0, 0);
2837 efx_filter_set_mc_def(&allmulti);
2838 efx_filter_set_vport_id(&allmulti, efx->tc->reps_mport_vport_id);
2839 rc = efx_filter_insert_filter(efx, &allmulti, false);
2840 if (rc < 0)
2841 return rc;
2842 efx->tc->reps_filter_mc = rc;
2843 return 0;
2844}
2845
2846void efx_tc_remove_rep_filters(struct efx_nic *efx)
2847{
2848 if (efx->type->is_vf)
2849 return;
2850 if (!efx->tc)
2851 return;
2852 if (efx->tc->reps_filter_mc >= 0)
2853 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, efx->tc->reps_filter_mc);
2854 efx->tc->reps_filter_mc = -1;
2855 if (efx->tc->reps_filter_uc >= 0)
2856 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, efx->tc->reps_filter_uc);
2857 efx->tc->reps_filter_uc = -1;
2858}
2859
2860int efx_init_tc(struct efx_nic *efx)
2861{
2862 int rc;
2863
2864 rc = efx_mae_get_caps(efx, efx->tc->caps);
2865 if (rc)
2866 return rc;
2867 if (efx->tc->caps->match_field_count > MAE_NUM_FIELDS)
2868 /* Firmware supports some match fields the driver doesn't know
2869 * about. Not fatal, unless any of those fields are required
2870 * (MAE_FIELD_SUPPORTED_MATCH_ALWAYS) but if so we don't know.
2871 */
2872 netif_warn(efx, probe, efx->net_dev,
2873 "FW reports additional match fields %u\n",
2874 efx->tc->caps->match_field_count);
2875 if (efx->tc->caps->action_prios < EFX_TC_PRIO__NUM) {
2876 netif_err(efx, probe, efx->net_dev,
2877 "Too few action prios supported (have %u, need %u)\n",
2878 efx->tc->caps->action_prios, EFX_TC_PRIO__NUM);
2879 return -EIO;
2880 }
2881 rc = efx_tc_configure_default_rule_pf(efx);
2882 if (rc)
2883 return rc;
2884 rc = efx_tc_configure_default_rule_wire(efx);
2885 if (rc)
2886 return rc;
2887 rc = efx_tc_configure_rep_mport(efx);
2888 if (rc)
2889 return rc;
2890 rc = efx_tc_configure_fallback_acts_pf(efx);
2891 if (rc)
2892 return rc;
2893 rc = efx_tc_configure_fallback_acts_reps(efx);
2894 if (rc)
2895 return rc;
2896 rc = efx_mae_get_tables(efx);
2897 if (rc)
2898 return rc;
2899 rc = flow_indr_dev_register(efx_tc_indr_setup_cb, efx);
2900 if (rc)
2901 goto out_free;
2902 efx->tc->up = true;
2903 return 0;
2904out_free:
2905 efx_mae_free_tables(efx);
2906 return rc;
2907}
2908
2909void efx_fini_tc(struct efx_nic *efx)
2910{
2911 /* We can get called even if efx_init_struct_tc() failed */
2912 if (!efx->tc)
2913 return;
2914 if (efx->tc->up)
2915 flow_indr_dev_unregister(efx_tc_indr_setup_cb, efx, efx_tc_block_unbind);
2916 efx_tc_deconfigure_rep_mport(efx);
2917 efx_tc_deconfigure_default_rule(efx, &efx->tc->dflt.pf);
2918 efx_tc_deconfigure_default_rule(efx, &efx->tc->dflt.wire);
2919 efx_tc_deconfigure_fallback_acts(efx, &efx->tc->facts.pf);
2920 efx_tc_deconfigure_fallback_acts(efx, &efx->tc->facts.reps);
2921 efx->tc->up = false;
2922 efx_mae_free_tables(efx);
2923}
2924
2925/* At teardown time, all TC filter rules (and thus all resources they created)
2926 * should already have been removed. If we find any in our hashtables, make a
2927 * cursory attempt to clean up the software side.
2928 */
2929static void efx_tc_encap_match_free(void *ptr, void *__unused)
2930{
2931 struct efx_tc_encap_match *encap = ptr;
2932
2933 WARN_ON(refcount_read(&encap->ref));
2934 kfree(encap);
2935}
2936
2937static void efx_tc_recirc_free(void *ptr, void *arg)
2938{
2939 struct efx_tc_recirc_id *rid = ptr;
2940 struct efx_nic *efx = arg;
2941
2942 WARN_ON(refcount_read(&rid->ref));
2943 ida_free(&efx->tc->recirc_ida, rid->fw_id);
2944 kfree(rid);
2945}
2946
2947static void efx_tc_lhs_free(void *ptr, void *arg)
2948{
2949 struct efx_tc_lhs_rule *rule = ptr;
2950 struct efx_nic *efx = arg;
2951
2952 netif_err(efx, drv, efx->net_dev,
2953 "tc lhs_rule %lx still present at teardown, removing\n",
2954 rule->cookie);
2955
2956 if (rule->lhs_act.zone)
2957 efx_tc_ct_unregister_zone(efx, rule->lhs_act.zone);
2958 if (rule->lhs_act.count)
2959 efx_tc_flower_put_counter_index(efx, rule->lhs_act.count);
2960 efx_mae_remove_lhs_rule(efx, rule);
2961
2962 kfree(rule);
2963}
2964
2965static void efx_tc_mac_free(void *ptr, void *__unused)
2966{
2967 struct efx_tc_mac_pedit_action *ped = ptr;
2968
2969 WARN_ON(refcount_read(&ped->ref));
2970 kfree(ped);
2971}
2972
2973static void efx_tc_flow_free(void *ptr, void *arg)
2974{
2975 struct efx_tc_flow_rule *rule = ptr;
2976 struct efx_nic *efx = arg;
2977
2978 netif_err(efx, drv, efx->net_dev,
2979 "tc rule %lx still present at teardown, removing\n",
2980 rule->cookie);
2981
2982 /* Also releases entries in subsidiary tables */
2983 efx_tc_delete_rule(efx, rule);
2984
2985 kfree(rule);
2986}
2987
2988int efx_init_struct_tc(struct efx_nic *efx)
2989{
2990 int rc;
2991
2992 if (efx->type->is_vf)
2993 return 0;
2994
2995 efx->tc = kzalloc(sizeof(*efx->tc), GFP_KERNEL);
2996 if (!efx->tc)
2997 return -ENOMEM;
2998 efx->tc->caps = kzalloc(sizeof(struct mae_caps), GFP_KERNEL);
2999 if (!efx->tc->caps) {
3000 rc = -ENOMEM;
3001 goto fail_alloc_caps;
3002 }
3003 INIT_LIST_HEAD(&efx->tc->block_list);
3004
3005 mutex_init(&efx->tc->mutex);
3006 init_waitqueue_head(&efx->tc->flush_wq);
3007 rc = efx_tc_init_encap_actions(efx);
3008 if (rc < 0)
3009 goto fail_encap_actions;
3010 rc = efx_tc_init_counters(efx);
3011 if (rc < 0)
3012 goto fail_counters;
3013 rc = rhashtable_init(&efx->tc->mac_ht, &efx_tc_mac_ht_params);
3014 if (rc < 0)
3015 goto fail_mac_ht;
3016 rc = rhashtable_init(&efx->tc->encap_match_ht, &efx_tc_encap_match_ht_params);
3017 if (rc < 0)
3018 goto fail_encap_match_ht;
3019 rc = rhashtable_init(&efx->tc->match_action_ht, &efx_tc_match_action_ht_params);
3020 if (rc < 0)
3021 goto fail_match_action_ht;
3022 rc = rhashtable_init(&efx->tc->lhs_rule_ht, &efx_tc_lhs_rule_ht_params);
3023 if (rc < 0)
3024 goto fail_lhs_rule_ht;
3025 rc = efx_tc_init_conntrack(efx);
3026 if (rc < 0)
3027 goto fail_conntrack;
3028 rc = rhashtable_init(&efx->tc->recirc_ht, &efx_tc_recirc_ht_params);
3029 if (rc < 0)
3030 goto fail_recirc_ht;
3031 ida_init(&efx->tc->recirc_ida);
3032 efx->tc->reps_filter_uc = -1;
3033 efx->tc->reps_filter_mc = -1;
3034 INIT_LIST_HEAD(&efx->tc->dflt.pf.acts.list);
3035 efx->tc->dflt.pf.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
3036 INIT_LIST_HEAD(&efx->tc->dflt.wire.acts.list);
3037 efx->tc->dflt.wire.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
3038 INIT_LIST_HEAD(&efx->tc->facts.pf.list);
3039 efx->tc->facts.pf.fw_id = MC_CMD_MAE_ACTION_SET_ALLOC_OUT_ACTION_SET_ID_NULL;
3040 INIT_LIST_HEAD(&efx->tc->facts.reps.list);
3041 efx->tc->facts.reps.fw_id = MC_CMD_MAE_ACTION_SET_ALLOC_OUT_ACTION_SET_ID_NULL;
3042 efx->extra_channel_type[EFX_EXTRA_CHANNEL_TC] = &efx_tc_channel_type;
3043 return 0;
3044fail_recirc_ht:
3045 efx_tc_destroy_conntrack(efx);
3046fail_conntrack:
3047 rhashtable_destroy(&efx->tc->lhs_rule_ht);
3048fail_lhs_rule_ht:
3049 rhashtable_destroy(&efx->tc->match_action_ht);
3050fail_match_action_ht:
3051 rhashtable_destroy(&efx->tc->encap_match_ht);
3052fail_encap_match_ht:
3053 rhashtable_destroy(&efx->tc->mac_ht);
3054fail_mac_ht:
3055 efx_tc_destroy_counters(efx);
3056fail_counters:
3057 efx_tc_destroy_encap_actions(efx);
3058fail_encap_actions:
3059 mutex_destroy(&efx->tc->mutex);
3060 kfree(efx->tc->caps);
3061fail_alloc_caps:
3062 kfree(efx->tc);
3063 efx->tc = NULL;
3064 return rc;
3065}
3066
3067void efx_fini_struct_tc(struct efx_nic *efx)
3068{
3069 if (!efx->tc)
3070 return;
3071
3072 mutex_lock(&efx->tc->mutex);
3073 EFX_WARN_ON_PARANOID(efx->tc->dflt.pf.fw_id !=
3074 MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
3075 EFX_WARN_ON_PARANOID(efx->tc->dflt.wire.fw_id !=
3076 MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
3077 EFX_WARN_ON_PARANOID(efx->tc->facts.pf.fw_id !=
3078 MC_CMD_MAE_ACTION_SET_LIST_ALLOC_OUT_ACTION_SET_LIST_ID_NULL);
3079 EFX_WARN_ON_PARANOID(efx->tc->facts.reps.fw_id !=
3080 MC_CMD_MAE_ACTION_SET_LIST_ALLOC_OUT_ACTION_SET_LIST_ID_NULL);
3081 rhashtable_free_and_destroy(&efx->tc->lhs_rule_ht, efx_tc_lhs_free, efx);
3082 rhashtable_free_and_destroy(&efx->tc->match_action_ht, efx_tc_flow_free,
3083 efx);
3084 rhashtable_free_and_destroy(&efx->tc->encap_match_ht,
3085 efx_tc_encap_match_free, NULL);
3086 efx_tc_fini_conntrack(efx);
3087 rhashtable_free_and_destroy(&efx->tc->recirc_ht, efx_tc_recirc_free, efx);
3088 WARN_ON(!ida_is_empty(&efx->tc->recirc_ida));
3089 ida_destroy(&efx->tc->recirc_ida);
3090 rhashtable_free_and_destroy(&efx->tc->mac_ht, efx_tc_mac_free, NULL);
3091 efx_tc_fini_counters(efx);
3092 efx_tc_fini_encap_actions(efx);
3093 mutex_unlock(&efx->tc->mutex);
3094 mutex_destroy(&efx->tc->mutex);
3095 kfree(efx->tc->caps);
3096 kfree(efx->tc);
3097 efx->tc = NULL;
3098}