1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 /* 3 * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates. 4 * stmmac TC Handling (HW only) 5 */ 6 7 #include <net/pkt_cls.h> 8 #include <net/tc_act/tc_gact.h> 9 #include "common.h" 10 #include "dwmac4.h" 11 #include "dwmac5.h" 12 #include "stmmac.h" 13 14 static void tc_fill_all_pass_entry(struct stmmac_tc_entry *entry) 15 { 16 memset(entry, 0, sizeof(*entry)); 17 entry->in_use = true; 18 entry->is_last = true; 19 entry->is_frag = false; 20 entry->prio = ~0x0; 21 entry->handle = 0; 22 entry->val.match_data = 0x0; 23 entry->val.match_en = 0x0; 24 entry->val.af = 1; 25 entry->val.dma_ch_no = 0x0; 26 } 27 28 static struct stmmac_tc_entry *tc_find_entry(struct stmmac_priv *priv, 29 struct tc_cls_u32_offload *cls, 30 bool free) 31 { 32 struct stmmac_tc_entry *entry, *first = NULL, *dup = NULL; 33 u32 loc = cls->knode.handle; 34 int i; 35 36 for (i = 0; i < priv->tc_entries_max; i++) { 37 entry = &priv->tc_entries[i]; 38 if (!entry->in_use && !first && free) 39 first = entry; 40 if ((entry->handle == loc) && !free && !entry->is_frag) 41 dup = entry; 42 } 43 44 if (dup) 45 return dup; 46 if (first) { 47 first->handle = loc; 48 first->in_use = true; 49 50 /* Reset HW values */ 51 memset(&first->val, 0, sizeof(first->val)); 52 } 53 54 return first; 55 } 56 57 static int tc_fill_actions(struct stmmac_tc_entry *entry, 58 struct stmmac_tc_entry *frag, 59 struct tc_cls_u32_offload *cls) 60 { 61 struct stmmac_tc_entry *action_entry = entry; 62 const struct tc_action *act; 63 struct tcf_exts *exts; 64 int i; 65 66 exts = cls->knode.exts; 67 if (!tcf_exts_has_actions(exts)) 68 return -EINVAL; 69 if (frag) 70 action_entry = frag; 71 72 tcf_exts_for_each_action(i, act, exts) { 73 /* Accept */ 74 if (is_tcf_gact_ok(act)) { 75 action_entry->val.af = 1; 76 break; 77 } 78 /* Drop */ 79 if (is_tcf_gact_shot(act)) { 80 action_entry->val.rf = 1; 81 break; 82 } 83 84 /* Unsupported */ 85 return -EINVAL; 86 } 87 88 return 0; 89 } 90 91 static int tc_fill_entry(struct stmmac_priv *priv, 92 struct tc_cls_u32_offload *cls) 93 { 94 struct stmmac_tc_entry *entry, *frag = NULL; 95 struct tc_u32_sel *sel = cls->knode.sel; 96 u32 off, data, mask, real_off, rem; 97 u32 prio = cls->common.prio << 16; 98 int ret; 99 100 /* Only 1 match per entry */ 101 if (sel->nkeys <= 0 || sel->nkeys > 1) 102 return -EINVAL; 103 104 off = sel->keys[0].off << sel->offshift; 105 data = sel->keys[0].val; 106 mask = sel->keys[0].mask; 107 108 switch (ntohs(cls->common.protocol)) { 109 case ETH_P_ALL: 110 break; 111 case ETH_P_IP: 112 off += ETH_HLEN; 113 break; 114 default: 115 return -EINVAL; 116 } 117 118 if (off > priv->tc_off_max) 119 return -EINVAL; 120 121 real_off = off / 4; 122 rem = off % 4; 123 124 entry = tc_find_entry(priv, cls, true); 125 if (!entry) 126 return -EINVAL; 127 128 if (rem) { 129 frag = tc_find_entry(priv, cls, true); 130 if (!frag) { 131 ret = -EINVAL; 132 goto err_unuse; 133 } 134 135 entry->frag_ptr = frag; 136 entry->val.match_en = (mask << (rem * 8)) & 137 GENMASK(31, rem * 8); 138 entry->val.match_data = (data << (rem * 8)) & 139 GENMASK(31, rem * 8); 140 entry->val.frame_offset = real_off; 141 entry->prio = prio; 142 143 frag->val.match_en = (mask >> (rem * 8)) & 144 GENMASK(rem * 8 - 1, 0); 145 frag->val.match_data = (data >> (rem * 8)) & 146 GENMASK(rem * 8 - 1, 0); 147 frag->val.frame_offset = real_off + 1; 148 frag->prio = prio; 149 frag->is_frag = true; 150 } else { 151 entry->frag_ptr = NULL; 152 entry->val.match_en = mask; 153 entry->val.match_data = data; 154 entry->val.frame_offset = real_off; 155 entry->prio = prio; 156 } 157 158 ret = tc_fill_actions(entry, frag, cls); 159 if (ret) 160 goto err_unuse; 161 162 return 0; 163 164 err_unuse: 165 if (frag) 166 frag->in_use = false; 167 entry->in_use = false; 168 return ret; 169 } 170 171 static void tc_unfill_entry(struct stmmac_priv *priv, 172 struct tc_cls_u32_offload *cls) 173 { 174 struct stmmac_tc_entry *entry; 175 176 entry = tc_find_entry(priv, cls, false); 177 if (!entry) 178 return; 179 180 entry->in_use = false; 181 if (entry->frag_ptr) { 182 entry = entry->frag_ptr; 183 entry->is_frag = false; 184 entry->in_use = false; 185 } 186 } 187 188 static int tc_config_knode(struct stmmac_priv *priv, 189 struct tc_cls_u32_offload *cls) 190 { 191 int ret; 192 193 ret = tc_fill_entry(priv, cls); 194 if (ret) 195 return ret; 196 197 ret = stmmac_rxp_config(priv, priv->hw->pcsr, priv->tc_entries, 198 priv->tc_entries_max); 199 if (ret) 200 goto err_unfill; 201 202 return 0; 203 204 err_unfill: 205 tc_unfill_entry(priv, cls); 206 return ret; 207 } 208 209 static int tc_delete_knode(struct stmmac_priv *priv, 210 struct tc_cls_u32_offload *cls) 211 { 212 int ret; 213 214 /* Set entry and fragments as not used */ 215 tc_unfill_entry(priv, cls); 216 217 ret = stmmac_rxp_config(priv, priv->hw->pcsr, priv->tc_entries, 218 priv->tc_entries_max); 219 if (ret) 220 return ret; 221 222 return 0; 223 } 224 225 static int tc_setup_cls_u32(struct stmmac_priv *priv, 226 struct tc_cls_u32_offload *cls) 227 { 228 switch (cls->command) { 229 case TC_CLSU32_REPLACE_KNODE: 230 tc_unfill_entry(priv, cls); 231 /* Fall through */ 232 case TC_CLSU32_NEW_KNODE: 233 return tc_config_knode(priv, cls); 234 case TC_CLSU32_DELETE_KNODE: 235 return tc_delete_knode(priv, cls); 236 default: 237 return -EOPNOTSUPP; 238 } 239 } 240 241 static int tc_init(struct stmmac_priv *priv) 242 { 243 struct dma_features *dma_cap = &priv->dma_cap; 244 unsigned int count; 245 int i; 246 247 if (dma_cap->l3l4fnum) { 248 priv->flow_entries_max = dma_cap->l3l4fnum; 249 priv->flow_entries = devm_kcalloc(priv->device, 250 dma_cap->l3l4fnum, 251 sizeof(*priv->flow_entries), 252 GFP_KERNEL); 253 if (!priv->flow_entries) 254 return -ENOMEM; 255 256 for (i = 0; i < priv->flow_entries_max; i++) 257 priv->flow_entries[i].idx = i; 258 259 dev_info(priv->device, "Enabled Flow TC (entries=%d)\n", 260 priv->flow_entries_max); 261 } 262 263 /* Fail silently as we can still use remaining features, e.g. CBS */ 264 if (!dma_cap->frpsel) 265 return 0; 266 267 switch (dma_cap->frpbs) { 268 case 0x0: 269 priv->tc_off_max = 64; 270 break; 271 case 0x1: 272 priv->tc_off_max = 128; 273 break; 274 case 0x2: 275 priv->tc_off_max = 256; 276 break; 277 default: 278 return -EINVAL; 279 } 280 281 switch (dma_cap->frpes) { 282 case 0x0: 283 count = 64; 284 break; 285 case 0x1: 286 count = 128; 287 break; 288 case 0x2: 289 count = 256; 290 break; 291 default: 292 return -EINVAL; 293 } 294 295 /* Reserve one last filter which lets all pass */ 296 priv->tc_entries_max = count; 297 priv->tc_entries = devm_kcalloc(priv->device, 298 count, sizeof(*priv->tc_entries), GFP_KERNEL); 299 if (!priv->tc_entries) 300 return -ENOMEM; 301 302 tc_fill_all_pass_entry(&priv->tc_entries[count - 1]); 303 304 dev_info(priv->device, "Enabling HW TC (entries=%d, max_off=%d)\n", 305 priv->tc_entries_max, priv->tc_off_max); 306 return 0; 307 } 308 309 static int tc_setup_cbs(struct stmmac_priv *priv, 310 struct tc_cbs_qopt_offload *qopt) 311 { 312 u32 tx_queues_count = priv->plat->tx_queues_to_use; 313 u32 queue = qopt->queue; 314 u32 ptr, speed_div; 315 u32 mode_to_use; 316 u64 value; 317 int ret; 318 319 /* Queue 0 is not AVB capable */ 320 if (queue <= 0 || queue >= tx_queues_count) 321 return -EINVAL; 322 if (!priv->dma_cap.av) 323 return -EOPNOTSUPP; 324 if (priv->speed != SPEED_100 && priv->speed != SPEED_1000) 325 return -EOPNOTSUPP; 326 327 mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use; 328 if (mode_to_use == MTL_QUEUE_DCB && qopt->enable) { 329 ret = stmmac_dma_qmode(priv, priv->ioaddr, queue, MTL_QUEUE_AVB); 330 if (ret) 331 return ret; 332 333 priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB; 334 } else if (!qopt->enable) { 335 return stmmac_dma_qmode(priv, priv->ioaddr, queue, MTL_QUEUE_DCB); 336 } 337 338 /* Port Transmit Rate and Speed Divider */ 339 ptr = (priv->speed == SPEED_100) ? 4 : 8; 340 speed_div = (priv->speed == SPEED_100) ? 100000 : 1000000; 341 342 /* Final adjustments for HW */ 343 value = div_s64(qopt->idleslope * 1024ll * ptr, speed_div); 344 priv->plat->tx_queues_cfg[queue].idle_slope = value & GENMASK(31, 0); 345 346 value = div_s64(-qopt->sendslope * 1024ll * ptr, speed_div); 347 priv->plat->tx_queues_cfg[queue].send_slope = value & GENMASK(31, 0); 348 349 value = qopt->hicredit * 1024ll * 8; 350 priv->plat->tx_queues_cfg[queue].high_credit = value & GENMASK(31, 0); 351 352 value = qopt->locredit * 1024ll * 8; 353 priv->plat->tx_queues_cfg[queue].low_credit = value & GENMASK(31, 0); 354 355 ret = stmmac_config_cbs(priv, priv->hw, 356 priv->plat->tx_queues_cfg[queue].send_slope, 357 priv->plat->tx_queues_cfg[queue].idle_slope, 358 priv->plat->tx_queues_cfg[queue].high_credit, 359 priv->plat->tx_queues_cfg[queue].low_credit, 360 queue); 361 if (ret) 362 return ret; 363 364 dev_info(priv->device, "CBS queue %d: send %d, idle %d, hi %d, lo %d\n", 365 queue, qopt->sendslope, qopt->idleslope, 366 qopt->hicredit, qopt->locredit); 367 return 0; 368 } 369 370 static int tc_parse_flow_actions(struct stmmac_priv *priv, 371 struct flow_action *action, 372 struct stmmac_flow_entry *entry) 373 { 374 struct flow_action_entry *act; 375 int i; 376 377 if (!flow_action_has_entries(action)) 378 return -EINVAL; 379 380 flow_action_for_each(i, act, action) { 381 switch (act->id) { 382 case FLOW_ACTION_DROP: 383 entry->action |= STMMAC_FLOW_ACTION_DROP; 384 return 0; 385 default: 386 break; 387 } 388 } 389 390 /* Nothing to do, maybe inverse filter ? */ 391 return 0; 392 } 393 394 static int tc_add_basic_flow(struct stmmac_priv *priv, 395 struct flow_cls_offload *cls, 396 struct stmmac_flow_entry *entry) 397 { 398 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 399 struct flow_dissector *dissector = rule->match.dissector; 400 struct flow_match_basic match; 401 402 /* Nothing to do here */ 403 if (!dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_BASIC)) 404 return -EINVAL; 405 406 flow_rule_match_basic(rule, &match); 407 entry->ip_proto = match.key->ip_proto; 408 return 0; 409 } 410 411 static int tc_add_ip4_flow(struct stmmac_priv *priv, 412 struct flow_cls_offload *cls, 413 struct stmmac_flow_entry *entry) 414 { 415 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 416 struct flow_dissector *dissector = rule->match.dissector; 417 bool inv = entry->action & STMMAC_FLOW_ACTION_DROP; 418 struct flow_match_ipv4_addrs match; 419 u32 hw_match; 420 int ret; 421 422 /* Nothing to do here */ 423 if (!dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) 424 return -EINVAL; 425 426 flow_rule_match_ipv4_addrs(rule, &match); 427 hw_match = ntohl(match.key->src) & ntohl(match.mask->src); 428 if (hw_match) { 429 ret = stmmac_config_l3_filter(priv, priv->hw, entry->idx, true, 430 false, true, inv, hw_match); 431 if (ret) 432 return ret; 433 } 434 435 hw_match = ntohl(match.key->dst) & ntohl(match.mask->dst); 436 if (hw_match) { 437 ret = stmmac_config_l3_filter(priv, priv->hw, entry->idx, true, 438 false, false, inv, hw_match); 439 if (ret) 440 return ret; 441 } 442 443 return 0; 444 } 445 446 static int tc_add_ports_flow(struct stmmac_priv *priv, 447 struct flow_cls_offload *cls, 448 struct stmmac_flow_entry *entry) 449 { 450 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 451 struct flow_dissector *dissector = rule->match.dissector; 452 bool inv = entry->action & STMMAC_FLOW_ACTION_DROP; 453 struct flow_match_ports match; 454 u32 hw_match; 455 bool is_udp; 456 int ret; 457 458 /* Nothing to do here */ 459 if (!dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_PORTS)) 460 return -EINVAL; 461 462 switch (entry->ip_proto) { 463 case IPPROTO_TCP: 464 is_udp = false; 465 break; 466 case IPPROTO_UDP: 467 is_udp = true; 468 break; 469 default: 470 return -EINVAL; 471 } 472 473 flow_rule_match_ports(rule, &match); 474 475 hw_match = ntohs(match.key->src) & ntohs(match.mask->src); 476 if (hw_match) { 477 ret = stmmac_config_l4_filter(priv, priv->hw, entry->idx, true, 478 is_udp, true, inv, hw_match); 479 if (ret) 480 return ret; 481 } 482 483 hw_match = ntohs(match.key->dst) & ntohs(match.mask->dst); 484 if (hw_match) { 485 ret = stmmac_config_l4_filter(priv, priv->hw, entry->idx, true, 486 is_udp, false, inv, hw_match); 487 if (ret) 488 return ret; 489 } 490 491 entry->is_l4 = true; 492 return 0; 493 } 494 495 static struct stmmac_flow_entry *tc_find_flow(struct stmmac_priv *priv, 496 struct flow_cls_offload *cls, 497 bool get_free) 498 { 499 int i; 500 501 for (i = 0; i < priv->flow_entries_max; i++) { 502 struct stmmac_flow_entry *entry = &priv->flow_entries[i]; 503 504 if (entry->cookie == cls->cookie) 505 return entry; 506 if (get_free && (entry->in_use == false)) 507 return entry; 508 } 509 510 return NULL; 511 } 512 513 static struct { 514 int (*fn)(struct stmmac_priv *priv, struct flow_cls_offload *cls, 515 struct stmmac_flow_entry *entry); 516 } tc_flow_parsers[] = { 517 { .fn = tc_add_basic_flow }, 518 { .fn = tc_add_ip4_flow }, 519 { .fn = tc_add_ports_flow }, 520 }; 521 522 static int tc_add_flow(struct stmmac_priv *priv, 523 struct flow_cls_offload *cls) 524 { 525 struct stmmac_flow_entry *entry = tc_find_flow(priv, cls, false); 526 struct flow_rule *rule = flow_cls_offload_flow_rule(cls); 527 int i, ret; 528 529 if (!entry) { 530 entry = tc_find_flow(priv, cls, true); 531 if (!entry) 532 return -ENOENT; 533 } 534 535 ret = tc_parse_flow_actions(priv, &rule->action, entry); 536 if (ret) 537 return ret; 538 539 for (i = 0; i < ARRAY_SIZE(tc_flow_parsers); i++) { 540 ret = tc_flow_parsers[i].fn(priv, cls, entry); 541 if (!ret) { 542 entry->in_use = true; 543 continue; 544 } 545 } 546 547 if (!entry->in_use) 548 return -EINVAL; 549 550 entry->cookie = cls->cookie; 551 return 0; 552 } 553 554 static int tc_del_flow(struct stmmac_priv *priv, 555 struct flow_cls_offload *cls) 556 { 557 struct stmmac_flow_entry *entry = tc_find_flow(priv, cls, false); 558 int ret; 559 560 if (!entry || !entry->in_use) 561 return -ENOENT; 562 563 if (entry->is_l4) { 564 ret = stmmac_config_l4_filter(priv, priv->hw, entry->idx, false, 565 false, false, false, 0); 566 } else { 567 ret = stmmac_config_l3_filter(priv, priv->hw, entry->idx, false, 568 false, false, false, 0); 569 } 570 571 entry->in_use = false; 572 entry->cookie = 0; 573 entry->is_l4 = false; 574 return ret; 575 } 576 577 static int tc_setup_cls(struct stmmac_priv *priv, 578 struct flow_cls_offload *cls) 579 { 580 int ret = 0; 581 582 switch (cls->command) { 583 case FLOW_CLS_REPLACE: 584 ret = tc_add_flow(priv, cls); 585 break; 586 case FLOW_CLS_DESTROY: 587 ret = tc_del_flow(priv, cls); 588 break; 589 default: 590 return -EOPNOTSUPP; 591 } 592 593 return ret; 594 } 595 596 const struct stmmac_tc_ops dwmac510_tc_ops = { 597 .init = tc_init, 598 .setup_cls_u32 = tc_setup_cls_u32, 599 .setup_cbs = tc_setup_cbs, 600 .setup_cls = tc_setup_cls, 601 }; 602