1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright 2017 6WIND S.A. 3 * Copyright 2017 Mellanox Technologies, Ltd 4 */ 5 6 #include <errno.h> 7 #include <string.h> 8 #include <unistd.h> 9 #include <sys/queue.h> 10 #include <sys/resource.h> 11 12 #include <rte_byteorder.h> 13 #include <rte_jhash.h> 14 #include <rte_malloc.h> 15 #include <rte_eth_tap.h> 16 #include <tap_flow.h> 17 #include <tap_autoconf.h> 18 #include <tap_tcmsgs.h> 19 #include <tap_rss.h> 20 21 #ifndef HAVE_TC_FLOWER 22 /* 23 * For kernels < 4.2, this enum is not defined. Runtime checks will be made to 24 * avoid sending TC messages the kernel cannot understand. 25 */ 26 enum { 27 TCA_FLOWER_UNSPEC, 28 TCA_FLOWER_CLASSID, 29 TCA_FLOWER_INDEV, 30 TCA_FLOWER_ACT, 31 TCA_FLOWER_KEY_ETH_DST, /* ETH_ALEN */ 32 TCA_FLOWER_KEY_ETH_DST_MASK, /* ETH_ALEN */ 33 TCA_FLOWER_KEY_ETH_SRC, /* ETH_ALEN */ 34 TCA_FLOWER_KEY_ETH_SRC_MASK, /* ETH_ALEN */ 35 TCA_FLOWER_KEY_ETH_TYPE, /* be16 */ 36 TCA_FLOWER_KEY_IP_PROTO, /* u8 */ 37 TCA_FLOWER_KEY_IPV4_SRC, /* be32 */ 38 TCA_FLOWER_KEY_IPV4_SRC_MASK, /* be32 */ 39 TCA_FLOWER_KEY_IPV4_DST, /* be32 */ 40 TCA_FLOWER_KEY_IPV4_DST_MASK, /* be32 */ 41 TCA_FLOWER_KEY_IPV6_SRC, /* struct in6_addr */ 42 TCA_FLOWER_KEY_IPV6_SRC_MASK, /* struct in6_addr */ 43 TCA_FLOWER_KEY_IPV6_DST, /* struct in6_addr */ 44 TCA_FLOWER_KEY_IPV6_DST_MASK, /* struct in6_addr */ 45 TCA_FLOWER_KEY_TCP_SRC, /* be16 */ 46 TCA_FLOWER_KEY_TCP_DST, /* be16 */ 47 TCA_FLOWER_KEY_UDP_SRC, /* be16 */ 48 TCA_FLOWER_KEY_UDP_DST, /* be16 */ 49 }; 50 #endif 51 #ifndef HAVE_TC_VLAN_ID 52 enum { 53 /* TCA_FLOWER_FLAGS, */ 54 TCA_FLOWER_KEY_VLAN_ID = TCA_FLOWER_KEY_UDP_DST + 2, /* be16 */ 55 TCA_FLOWER_KEY_VLAN_PRIO, /* u8 */ 56 TCA_FLOWER_KEY_VLAN_ETH_TYPE, /* be16 */ 57 }; 58 #endif 59 /* 60 * For kernels < 4.2 BPF related enums may not be defined. 61 * Runtime checks will be carried out to gracefully report on TC messages that 62 * are rejected by the kernel. Rejection reasons may be due to: 63 * 1. enum is not defined 64 * 2. enum is defined but kernel is not configured to support BPF system calls, 65 * BPF classifications or BPF actions. 66 */ 67 #ifndef HAVE_TC_BPF 68 enum { 69 TCA_BPF_UNSPEC, 70 TCA_BPF_ACT, 71 TCA_BPF_POLICE, 72 TCA_BPF_CLASSID, 73 TCA_BPF_OPS_LEN, 74 TCA_BPF_OPS, 75 }; 76 #endif 77 #ifndef HAVE_TC_BPF_FD 78 enum { 79 TCA_BPF_FD = TCA_BPF_OPS + 1, 80 TCA_BPF_NAME, 81 }; 82 #endif 83 #ifndef HAVE_TC_ACT_BPF 84 #define tc_gen \ 85 __u32 index; \ 86 __u32 capab; \ 87 int action; \ 88 int refcnt; \ 89 int bindcnt 90 91 struct tc_act_bpf { 92 tc_gen; 93 }; 94 95 enum { 96 TCA_ACT_BPF_UNSPEC, 97 TCA_ACT_BPF_TM, 98 TCA_ACT_BPF_PARMS, 99 TCA_ACT_BPF_OPS_LEN, 100 TCA_ACT_BPF_OPS, 101 }; 102 103 #endif 104 #ifndef HAVE_TC_ACT_BPF_FD 105 enum { 106 TCA_ACT_BPF_FD = TCA_ACT_BPF_OPS + 1, 107 TCA_ACT_BPF_NAME, 108 }; 109 #endif 110 111 /* RSS key management */ 112 enum bpf_rss_key_e { 113 KEY_CMD_GET = 1, 114 KEY_CMD_RELEASE, 115 KEY_CMD_INIT, 116 KEY_CMD_DEINIT, 117 }; 118 119 enum key_status_e { 120 KEY_STAT_UNSPEC, 121 KEY_STAT_USED, 122 KEY_STAT_AVAILABLE, 123 }; 124 125 #define ISOLATE_HANDLE 1 126 #define REMOTE_PROMISCUOUS_HANDLE 2 127 128 struct rte_flow { 129 LIST_ENTRY(rte_flow) next; /* Pointer to the next rte_flow structure */ 130 struct rte_flow *remote_flow; /* associated remote flow */ 131 int bpf_fd[SEC_MAX]; /* list of bfs fds per ELF section */ 132 uint32_t key_idx; /* RSS rule key index into BPF map */ 133 struct nlmsg msg; 134 }; 135 136 struct convert_data { 137 uint16_t eth_type; 138 uint16_t ip_proto; 139 uint8_t vlan; 140 struct rte_flow *flow; 141 }; 142 143 struct remote_rule { 144 struct rte_flow_attr attr; 145 struct rte_flow_item items[2]; 146 struct rte_flow_action actions[2]; 147 int mirred; 148 }; 149 150 struct action_data { 151 char id[16]; 152 153 union { 154 struct tc_gact gact; 155 struct tc_mirred mirred; 156 struct skbedit { 157 struct tc_skbedit skbedit; 158 uint16_t queue; 159 } skbedit; 160 struct bpf { 161 struct tc_act_bpf bpf; 162 int bpf_fd; 163 const char *annotation; 164 } bpf; 165 }; 166 }; 167 168 static int tap_flow_create_eth(const struct rte_flow_item *item, void *data); 169 static int tap_flow_create_vlan(const struct rte_flow_item *item, void *data); 170 static int tap_flow_create_ipv4(const struct rte_flow_item *item, void *data); 171 static int tap_flow_create_ipv6(const struct rte_flow_item *item, void *data); 172 static int tap_flow_create_udp(const struct rte_flow_item *item, void *data); 173 static int tap_flow_create_tcp(const struct rte_flow_item *item, void *data); 174 static int 175 tap_flow_validate(struct rte_eth_dev *dev, 176 const struct rte_flow_attr *attr, 177 const struct rte_flow_item items[], 178 const struct rte_flow_action actions[], 179 struct rte_flow_error *error); 180 181 static struct rte_flow * 182 tap_flow_create(struct rte_eth_dev *dev, 183 const struct rte_flow_attr *attr, 184 const struct rte_flow_item items[], 185 const struct rte_flow_action actions[], 186 struct rte_flow_error *error); 187 188 static void 189 tap_flow_free(struct pmd_internals *pmd, 190 struct rte_flow *flow); 191 192 static int 193 tap_flow_destroy(struct rte_eth_dev *dev, 194 struct rte_flow *flow, 195 struct rte_flow_error *error); 196 197 static int 198 tap_flow_isolate(struct rte_eth_dev *dev, 199 int set, 200 struct rte_flow_error *error); 201 202 static int bpf_rss_key(enum bpf_rss_key_e cmd, __u32 *key_idx); 203 static int rss_enable(struct pmd_internals *pmd, 204 const struct rte_flow_attr *attr, 205 struct rte_flow_error *error); 206 static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, 207 const struct rte_flow_action_rss *rss, 208 struct rte_flow_error *error); 209 210 static const struct rte_flow_ops tap_flow_ops = { 211 .validate = tap_flow_validate, 212 .create = tap_flow_create, 213 .destroy = tap_flow_destroy, 214 .flush = tap_flow_flush, 215 .isolate = tap_flow_isolate, 216 }; 217 218 /* Static initializer for items. */ 219 #define ITEMS(...) \ 220 (const enum rte_flow_item_type []){ \ 221 __VA_ARGS__, RTE_FLOW_ITEM_TYPE_END, \ 222 } 223 224 /* Structure to generate a simple graph of layers supported by the NIC. */ 225 struct tap_flow_items { 226 /* Bit-mask corresponding to what is supported for this item. */ 227 const void *mask; 228 const unsigned int mask_sz; /* Bit-mask size in bytes. */ 229 /* 230 * Bit-mask corresponding to the default mask, if none is provided 231 * along with the item. 232 */ 233 const void *default_mask; 234 /** 235 * Conversion function from rte_flow to netlink attributes. 236 * 237 * @param item 238 * rte_flow item to convert. 239 * @param data 240 * Internal structure to store the conversion. 241 * 242 * @return 243 * 0 on success, negative value otherwise. 244 */ 245 int (*convert)(const struct rte_flow_item *item, void *data); 246 /** List of possible following items. */ 247 const enum rte_flow_item_type *const items; 248 }; 249 250 /* Graph of supported items and associated actions. */ 251 static const struct tap_flow_items tap_flow_items[] = { 252 [RTE_FLOW_ITEM_TYPE_END] = { 253 .items = ITEMS(RTE_FLOW_ITEM_TYPE_ETH), 254 }, 255 [RTE_FLOW_ITEM_TYPE_ETH] = { 256 .items = ITEMS( 257 RTE_FLOW_ITEM_TYPE_VLAN, 258 RTE_FLOW_ITEM_TYPE_IPV4, 259 RTE_FLOW_ITEM_TYPE_IPV6), 260 .mask = &(const struct rte_flow_item_eth){ 261 .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff", 262 .src.addr_bytes = "\xff\xff\xff\xff\xff\xff", 263 .type = -1, 264 }, 265 .mask_sz = sizeof(struct rte_flow_item_eth), 266 .default_mask = &rte_flow_item_eth_mask, 267 .convert = tap_flow_create_eth, 268 }, 269 [RTE_FLOW_ITEM_TYPE_VLAN] = { 270 .items = ITEMS(RTE_FLOW_ITEM_TYPE_IPV4, 271 RTE_FLOW_ITEM_TYPE_IPV6), 272 .mask = &(const struct rte_flow_item_vlan){ 273 .tpid = -1, 274 /* DEI matching is not supported */ 275 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN 276 .tci = 0xffef, 277 #else 278 .tci = 0xefff, 279 #endif 280 }, 281 .mask_sz = sizeof(struct rte_flow_item_vlan), 282 .default_mask = &rte_flow_item_vlan_mask, 283 .convert = tap_flow_create_vlan, 284 }, 285 [RTE_FLOW_ITEM_TYPE_IPV4] = { 286 .items = ITEMS(RTE_FLOW_ITEM_TYPE_UDP, 287 RTE_FLOW_ITEM_TYPE_TCP), 288 .mask = &(const struct rte_flow_item_ipv4){ 289 .hdr = { 290 .src_addr = -1, 291 .dst_addr = -1, 292 .next_proto_id = -1, 293 }, 294 }, 295 .mask_sz = sizeof(struct rte_flow_item_ipv4), 296 .default_mask = &rte_flow_item_ipv4_mask, 297 .convert = tap_flow_create_ipv4, 298 }, 299 [RTE_FLOW_ITEM_TYPE_IPV6] = { 300 .items = ITEMS(RTE_FLOW_ITEM_TYPE_UDP, 301 RTE_FLOW_ITEM_TYPE_TCP), 302 .mask = &(const struct rte_flow_item_ipv6){ 303 .hdr = { 304 .src_addr = { 305 "\xff\xff\xff\xff\xff\xff\xff\xff" 306 "\xff\xff\xff\xff\xff\xff\xff\xff", 307 }, 308 .dst_addr = { 309 "\xff\xff\xff\xff\xff\xff\xff\xff" 310 "\xff\xff\xff\xff\xff\xff\xff\xff", 311 }, 312 .proto = -1, 313 }, 314 }, 315 .mask_sz = sizeof(struct rte_flow_item_ipv6), 316 .default_mask = &rte_flow_item_ipv6_mask, 317 .convert = tap_flow_create_ipv6, 318 }, 319 [RTE_FLOW_ITEM_TYPE_UDP] = { 320 .mask = &(const struct rte_flow_item_udp){ 321 .hdr = { 322 .src_port = -1, 323 .dst_port = -1, 324 }, 325 }, 326 .mask_sz = sizeof(struct rte_flow_item_udp), 327 .default_mask = &rte_flow_item_udp_mask, 328 .convert = tap_flow_create_udp, 329 }, 330 [RTE_FLOW_ITEM_TYPE_TCP] = { 331 .mask = &(const struct rte_flow_item_tcp){ 332 .hdr = { 333 .src_port = -1, 334 .dst_port = -1, 335 }, 336 }, 337 .mask_sz = sizeof(struct rte_flow_item_tcp), 338 .default_mask = &rte_flow_item_tcp_mask, 339 .convert = tap_flow_create_tcp, 340 }, 341 }; 342 343 /* 344 * TC rules, by growing priority 345 * 346 * Remote netdevice Tap netdevice 347 * +-------------+-------------+ +-------------+-------------+ 348 * | Ingress | Egress | | Ingress | Egress | 349 * |-------------|-------------| |-------------|-------------| 350 * | | \ / | | | REMOTE TX | prio 1 351 * | | \ / | | | \ / | prio 2 352 * | EXPLICIT | \ / | | EXPLICIT | \ / | . 353 * | | \ / | | | \ / | . 354 * | RULES | X | | RULES | X | . 355 * | . | / \ | | . | / \ | . 356 * | . | / \ | | . | / \ | . 357 * | . | / \ | | . | / \ | . 358 * | . | / \ | | . | / \ | . 359 * 360 * .... .... .... .... 361 * 362 * | . | \ / | | . | \ / | . 363 * | . | \ / | | . | \ / | . 364 * | | \ / | | | \ / | 365 * | LOCAL_MAC | \ / | | \ / | \ / | last prio - 5 366 * | PROMISC | X | | \ / | X | last prio - 4 367 * | ALLMULTI | / \ | | X | / \ | last prio - 3 368 * | BROADCAST | / \ | | / \ | / \ | last prio - 2 369 * | BROADCASTV6 | / \ | | / \ | / \ | last prio - 1 370 * | xx | / \ | | ISOLATE | / \ | last prio 371 * +-------------+-------------+ +-------------+-------------+ 372 * 373 * The implicit flow rules are stored in a list in with mandatorily the last two 374 * being the ISOLATE and REMOTE_TX rules. e.g.: 375 * 376 * LOCAL_MAC -> BROADCAST -> BROADCASTV6 -> REMOTE_TX -> ISOLATE -> NULL 377 * 378 * That enables tap_flow_isolate() to remove implicit rules by popping the list 379 * head and remove it as long as it applies on the remote netdevice. The 380 * implicit rule for TX redirection is not removed, as isolate concerns only 381 * incoming traffic. 382 */ 383 384 static struct remote_rule implicit_rte_flows[TAP_REMOTE_MAX_IDX] = { 385 [TAP_REMOTE_LOCAL_MAC] = { 386 .attr = { 387 .group = MAX_GROUP, 388 .priority = PRIORITY_MASK - TAP_REMOTE_LOCAL_MAC, 389 .ingress = 1, 390 }, 391 .items[0] = { 392 .type = RTE_FLOW_ITEM_TYPE_ETH, 393 .mask = &(const struct rte_flow_item_eth){ 394 .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff", 395 }, 396 }, 397 .items[1] = { 398 .type = RTE_FLOW_ITEM_TYPE_END, 399 }, 400 .mirred = TCA_EGRESS_REDIR, 401 }, 402 [TAP_REMOTE_BROADCAST] = { 403 .attr = { 404 .group = MAX_GROUP, 405 .priority = PRIORITY_MASK - TAP_REMOTE_BROADCAST, 406 .ingress = 1, 407 }, 408 .items[0] = { 409 .type = RTE_FLOW_ITEM_TYPE_ETH, 410 .mask = &(const struct rte_flow_item_eth){ 411 .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff", 412 }, 413 .spec = &(const struct rte_flow_item_eth){ 414 .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff", 415 }, 416 }, 417 .items[1] = { 418 .type = RTE_FLOW_ITEM_TYPE_END, 419 }, 420 .mirred = TCA_EGRESS_MIRROR, 421 }, 422 [TAP_REMOTE_BROADCASTV6] = { 423 .attr = { 424 .group = MAX_GROUP, 425 .priority = PRIORITY_MASK - TAP_REMOTE_BROADCASTV6, 426 .ingress = 1, 427 }, 428 .items[0] = { 429 .type = RTE_FLOW_ITEM_TYPE_ETH, 430 .mask = &(const struct rte_flow_item_eth){ 431 .dst.addr_bytes = "\x33\x33\x00\x00\x00\x00", 432 }, 433 .spec = &(const struct rte_flow_item_eth){ 434 .dst.addr_bytes = "\x33\x33\x00\x00\x00\x00", 435 }, 436 }, 437 .items[1] = { 438 .type = RTE_FLOW_ITEM_TYPE_END, 439 }, 440 .mirred = TCA_EGRESS_MIRROR, 441 }, 442 [TAP_REMOTE_PROMISC] = { 443 .attr = { 444 .group = MAX_GROUP, 445 .priority = PRIORITY_MASK - TAP_REMOTE_PROMISC, 446 .ingress = 1, 447 }, 448 .items[0] = { 449 .type = RTE_FLOW_ITEM_TYPE_VOID, 450 }, 451 .items[1] = { 452 .type = RTE_FLOW_ITEM_TYPE_END, 453 }, 454 .mirred = TCA_EGRESS_MIRROR, 455 }, 456 [TAP_REMOTE_ALLMULTI] = { 457 .attr = { 458 .group = MAX_GROUP, 459 .priority = PRIORITY_MASK - TAP_REMOTE_ALLMULTI, 460 .ingress = 1, 461 }, 462 .items[0] = { 463 .type = RTE_FLOW_ITEM_TYPE_ETH, 464 .mask = &(const struct rte_flow_item_eth){ 465 .dst.addr_bytes = "\x01\x00\x00\x00\x00\x00", 466 }, 467 .spec = &(const struct rte_flow_item_eth){ 468 .dst.addr_bytes = "\x01\x00\x00\x00\x00\x00", 469 }, 470 }, 471 .items[1] = { 472 .type = RTE_FLOW_ITEM_TYPE_END, 473 }, 474 .mirred = TCA_EGRESS_MIRROR, 475 }, 476 [TAP_REMOTE_TX] = { 477 .attr = { 478 .group = 0, 479 .priority = TAP_REMOTE_TX, 480 .egress = 1, 481 }, 482 .items[0] = { 483 .type = RTE_FLOW_ITEM_TYPE_VOID, 484 }, 485 .items[1] = { 486 .type = RTE_FLOW_ITEM_TYPE_END, 487 }, 488 .mirred = TCA_EGRESS_MIRROR, 489 }, 490 [TAP_ISOLATE] = { 491 .attr = { 492 .group = MAX_GROUP, 493 .priority = PRIORITY_MASK - TAP_ISOLATE, 494 .ingress = 1, 495 }, 496 .items[0] = { 497 .type = RTE_FLOW_ITEM_TYPE_VOID, 498 }, 499 .items[1] = { 500 .type = RTE_FLOW_ITEM_TYPE_END, 501 }, 502 }, 503 }; 504 505 /** 506 * Make as much checks as possible on an Ethernet item, and if a flow is 507 * provided, fill it appropriately with Ethernet info. 508 * 509 * @param[in] item 510 * Item specification. 511 * @param[in, out] data 512 * Additional data structure to tell next layers we've been here. 513 * 514 * @return 515 * 0 if checks are alright, -1 otherwise. 516 */ 517 static int 518 tap_flow_create_eth(const struct rte_flow_item *item, void *data) 519 { 520 struct convert_data *info = (struct convert_data *)data; 521 const struct rte_flow_item_eth *spec = item->spec; 522 const struct rte_flow_item_eth *mask = item->mask; 523 struct rte_flow *flow = info->flow; 524 struct nlmsg *msg; 525 526 /* use default mask if none provided */ 527 if (!mask) 528 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_ETH].default_mask; 529 /* TC does not support eth_type masking. Only accept if exact match. */ 530 if (mask->type && mask->type != 0xffff) 531 return -1; 532 if (!spec) 533 return 0; 534 /* store eth_type for consistency if ipv4/6 pattern item comes next */ 535 if (spec->type & mask->type) 536 info->eth_type = spec->type; 537 if (!flow) 538 return 0; 539 msg = &flow->msg; 540 if (!is_zero_ether_addr(&spec->dst)) { 541 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_DST, ETHER_ADDR_LEN, 542 &spec->dst.addr_bytes); 543 tap_nlattr_add(&msg->nh, 544 TCA_FLOWER_KEY_ETH_DST_MASK, ETHER_ADDR_LEN, 545 &mask->dst.addr_bytes); 546 } 547 if (!is_zero_ether_addr(&mask->src)) { 548 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_SRC, ETHER_ADDR_LEN, 549 &spec->src.addr_bytes); 550 tap_nlattr_add(&msg->nh, 551 TCA_FLOWER_KEY_ETH_SRC_MASK, ETHER_ADDR_LEN, 552 &mask->src.addr_bytes); 553 } 554 return 0; 555 } 556 557 /** 558 * Make as much checks as possible on a VLAN item, and if a flow is provided, 559 * fill it appropriately with VLAN info. 560 * 561 * @param[in] item 562 * Item specification. 563 * @param[in, out] data 564 * Additional data structure to tell next layers we've been here. 565 * 566 * @return 567 * 0 if checks are alright, -1 otherwise. 568 */ 569 static int 570 tap_flow_create_vlan(const struct rte_flow_item *item, void *data) 571 { 572 struct convert_data *info = (struct convert_data *)data; 573 const struct rte_flow_item_vlan *spec = item->spec; 574 const struct rte_flow_item_vlan *mask = item->mask; 575 struct rte_flow *flow = info->flow; 576 struct nlmsg *msg; 577 578 /* use default mask if none provided */ 579 if (!mask) 580 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_VLAN].default_mask; 581 /* TC does not support tpid masking. Only accept if exact match. */ 582 if (mask->tpid && mask->tpid != 0xffff) 583 return -1; 584 /* Double-tagging not supported. */ 585 if (spec && mask->tpid && spec->tpid != htons(ETH_P_8021Q)) 586 return -1; 587 info->vlan = 1; 588 if (!flow) 589 return 0; 590 msg = &flow->msg; 591 msg->t.tcm_info = TC_H_MAKE(msg->t.tcm_info, htons(ETH_P_8021Q)); 592 #define VLAN_PRIO(tci) ((tci) >> 13) 593 #define VLAN_ID(tci) ((tci) & 0xfff) 594 if (!spec) 595 return 0; 596 if (spec->tci) { 597 uint16_t tci = ntohs(spec->tci) & mask->tci; 598 uint16_t prio = VLAN_PRIO(tci); 599 uint8_t vid = VLAN_ID(tci); 600 601 if (prio) 602 tap_nlattr_add8(&msg->nh, 603 TCA_FLOWER_KEY_VLAN_PRIO, prio); 604 if (vid) 605 tap_nlattr_add16(&msg->nh, 606 TCA_FLOWER_KEY_VLAN_ID, vid); 607 } 608 return 0; 609 } 610 611 /** 612 * Make as much checks as possible on an IPv4 item, and if a flow is provided, 613 * fill it appropriately with IPv4 info. 614 * 615 * @param[in] item 616 * Item specification. 617 * @param[in, out] data 618 * Additional data structure to tell next layers we've been here. 619 * 620 * @return 621 * 0 if checks are alright, -1 otherwise. 622 */ 623 static int 624 tap_flow_create_ipv4(const struct rte_flow_item *item, void *data) 625 { 626 struct convert_data *info = (struct convert_data *)data; 627 const struct rte_flow_item_ipv4 *spec = item->spec; 628 const struct rte_flow_item_ipv4 *mask = item->mask; 629 struct rte_flow *flow = info->flow; 630 struct nlmsg *msg; 631 632 /* use default mask if none provided */ 633 if (!mask) 634 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_IPV4].default_mask; 635 /* check that previous eth type is compatible with ipv4 */ 636 if (info->eth_type && info->eth_type != htons(ETH_P_IP)) 637 return -1; 638 /* store ip_proto for consistency if udp/tcp pattern item comes next */ 639 if (spec) 640 info->ip_proto = spec->hdr.next_proto_id; 641 if (!flow) 642 return 0; 643 msg = &flow->msg; 644 if (!info->eth_type) 645 info->eth_type = htons(ETH_P_IP); 646 if (!spec) 647 return 0; 648 if (spec->hdr.dst_addr) { 649 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST, 650 spec->hdr.dst_addr); 651 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST_MASK, 652 mask->hdr.dst_addr); 653 } 654 if (spec->hdr.src_addr) { 655 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC, 656 spec->hdr.src_addr); 657 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC_MASK, 658 mask->hdr.src_addr); 659 } 660 if (spec->hdr.next_proto_id) 661 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, 662 spec->hdr.next_proto_id); 663 return 0; 664 } 665 666 /** 667 * Make as much checks as possible on an IPv6 item, and if a flow is provided, 668 * fill it appropriately with IPv6 info. 669 * 670 * @param[in] item 671 * Item specification. 672 * @param[in, out] data 673 * Additional data structure to tell next layers we've been here. 674 * 675 * @return 676 * 0 if checks are alright, -1 otherwise. 677 */ 678 static int 679 tap_flow_create_ipv6(const struct rte_flow_item *item, void *data) 680 { 681 struct convert_data *info = (struct convert_data *)data; 682 const struct rte_flow_item_ipv6 *spec = item->spec; 683 const struct rte_flow_item_ipv6 *mask = item->mask; 684 struct rte_flow *flow = info->flow; 685 uint8_t empty_addr[16] = { 0 }; 686 struct nlmsg *msg; 687 688 /* use default mask if none provided */ 689 if (!mask) 690 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_IPV6].default_mask; 691 /* check that previous eth type is compatible with ipv6 */ 692 if (info->eth_type && info->eth_type != htons(ETH_P_IPV6)) 693 return -1; 694 /* store ip_proto for consistency if udp/tcp pattern item comes next */ 695 if (spec) 696 info->ip_proto = spec->hdr.proto; 697 if (!flow) 698 return 0; 699 msg = &flow->msg; 700 if (!info->eth_type) 701 info->eth_type = htons(ETH_P_IPV6); 702 if (!spec) 703 return 0; 704 if (memcmp(spec->hdr.dst_addr, empty_addr, 16)) { 705 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST, 706 sizeof(spec->hdr.dst_addr), &spec->hdr.dst_addr); 707 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST_MASK, 708 sizeof(mask->hdr.dst_addr), &mask->hdr.dst_addr); 709 } 710 if (memcmp(spec->hdr.src_addr, empty_addr, 16)) { 711 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC, 712 sizeof(spec->hdr.src_addr), &spec->hdr.src_addr); 713 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC_MASK, 714 sizeof(mask->hdr.src_addr), &mask->hdr.src_addr); 715 } 716 if (spec->hdr.proto) 717 tap_nlattr_add8(&msg->nh, 718 TCA_FLOWER_KEY_IP_PROTO, spec->hdr.proto); 719 return 0; 720 } 721 722 /** 723 * Make as much checks as possible on a UDP item, and if a flow is provided, 724 * fill it appropriately with UDP info. 725 * 726 * @param[in] item 727 * Item specification. 728 * @param[in, out] data 729 * Additional data structure to tell next layers we've been here. 730 * 731 * @return 732 * 0 if checks are alright, -1 otherwise. 733 */ 734 static int 735 tap_flow_create_udp(const struct rte_flow_item *item, void *data) 736 { 737 struct convert_data *info = (struct convert_data *)data; 738 const struct rte_flow_item_udp *spec = item->spec; 739 const struct rte_flow_item_udp *mask = item->mask; 740 struct rte_flow *flow = info->flow; 741 struct nlmsg *msg; 742 743 /* use default mask if none provided */ 744 if (!mask) 745 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_UDP].default_mask; 746 /* check that previous ip_proto is compatible with udp */ 747 if (info->ip_proto && info->ip_proto != IPPROTO_UDP) 748 return -1; 749 /* TC does not support UDP port masking. Only accept if exact match. */ 750 if ((mask->hdr.src_port && mask->hdr.src_port != 0xffff) || 751 (mask->hdr.dst_port && mask->hdr.dst_port != 0xffff)) 752 return -1; 753 if (!flow) 754 return 0; 755 msg = &flow->msg; 756 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_UDP); 757 if (!spec) 758 return 0; 759 if (spec->hdr.dst_port & mask->hdr.dst_port) 760 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_DST, 761 spec->hdr.dst_port); 762 if (spec->hdr.src_port & mask->hdr.src_port) 763 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_SRC, 764 spec->hdr.src_port); 765 return 0; 766 } 767 768 /** 769 * Make as much checks as possible on a TCP item, and if a flow is provided, 770 * fill it appropriately with TCP info. 771 * 772 * @param[in] item 773 * Item specification. 774 * @param[in, out] data 775 * Additional data structure to tell next layers we've been here. 776 * 777 * @return 778 * 0 if checks are alright, -1 otherwise. 779 */ 780 static int 781 tap_flow_create_tcp(const struct rte_flow_item *item, void *data) 782 { 783 struct convert_data *info = (struct convert_data *)data; 784 const struct rte_flow_item_tcp *spec = item->spec; 785 const struct rte_flow_item_tcp *mask = item->mask; 786 struct rte_flow *flow = info->flow; 787 struct nlmsg *msg; 788 789 /* use default mask if none provided */ 790 if (!mask) 791 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_TCP].default_mask; 792 /* check that previous ip_proto is compatible with tcp */ 793 if (info->ip_proto && info->ip_proto != IPPROTO_TCP) 794 return -1; 795 /* TC does not support TCP port masking. Only accept if exact match. */ 796 if ((mask->hdr.src_port && mask->hdr.src_port != 0xffff) || 797 (mask->hdr.dst_port && mask->hdr.dst_port != 0xffff)) 798 return -1; 799 if (!flow) 800 return 0; 801 msg = &flow->msg; 802 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_TCP); 803 if (!spec) 804 return 0; 805 if (spec->hdr.dst_port & mask->hdr.dst_port) 806 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_DST, 807 spec->hdr.dst_port); 808 if (spec->hdr.src_port & mask->hdr.src_port) 809 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_SRC, 810 spec->hdr.src_port); 811 return 0; 812 } 813 814 /** 815 * Check support for a given item. 816 * 817 * @param[in] item 818 * Item specification. 819 * @param size 820 * Bit-Mask size in bytes. 821 * @param[in] supported_mask 822 * Bit-mask covering supported fields to compare with spec, last and mask in 823 * \item. 824 * @param[in] default_mask 825 * Bit-mask default mask if none is provided in \item. 826 * 827 * @return 828 * 0 on success. 829 */ 830 static int 831 tap_flow_item_validate(const struct rte_flow_item *item, 832 unsigned int size, 833 const uint8_t *supported_mask, 834 const uint8_t *default_mask) 835 { 836 int ret = 0; 837 838 /* An empty layer is allowed, as long as all fields are NULL */ 839 if (!item->spec && (item->mask || item->last)) 840 return -1; 841 /* Is the item spec compatible with what the NIC supports? */ 842 if (item->spec && !item->mask) { 843 unsigned int i; 844 const uint8_t *spec = item->spec; 845 846 for (i = 0; i < size; ++i) 847 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 848 return -1; 849 /* Is the default mask compatible with what the NIC supports? */ 850 for (i = 0; i < size; i++) 851 if ((default_mask[i] | supported_mask[i]) != 852 supported_mask[i]) 853 return -1; 854 } 855 /* Is the item last compatible with what the NIC supports? */ 856 if (item->last && !item->mask) { 857 unsigned int i; 858 const uint8_t *spec = item->last; 859 860 for (i = 0; i < size; ++i) 861 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 862 return -1; 863 } 864 /* Is the item mask compatible with what the NIC supports? */ 865 if (item->mask) { 866 unsigned int i; 867 const uint8_t *spec = item->mask; 868 869 for (i = 0; i < size; ++i) 870 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 871 return -1; 872 } 873 /** 874 * Once masked, Are item spec and item last equal? 875 * TC does not support range so anything else is invalid. 876 */ 877 if (item->spec && item->last) { 878 uint8_t spec[size]; 879 uint8_t last[size]; 880 const uint8_t *apply = default_mask; 881 unsigned int i; 882 883 if (item->mask) 884 apply = item->mask; 885 for (i = 0; i < size; ++i) { 886 spec[i] = ((const uint8_t *)item->spec)[i] & apply[i]; 887 last[i] = ((const uint8_t *)item->last)[i] & apply[i]; 888 } 889 ret = memcmp(spec, last, size); 890 } 891 return ret; 892 } 893 894 /** 895 * Configure the kernel with a TC action and its configured parameters 896 * Handled actions: "gact", "mirred", "skbedit", "bpf" 897 * 898 * @param[in] flow 899 * Pointer to rte flow containing the netlink message 900 * 901 * @param[in, out] act_index 902 * Pointer to action sequence number in the TC command 903 * 904 * @param[in] adata 905 * Pointer to struct holding the action parameters 906 * 907 * @return 908 * -1 on failure, 0 on success 909 */ 910 static int 911 add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata) 912 { 913 struct nlmsg *msg = &flow->msg; 914 915 if (tap_nlattr_nested_start(msg, (*act_index)++) < 0) 916 return -1; 917 918 tap_nlattr_add(&msg->nh, TCA_ACT_KIND, 919 strlen(adata->id) + 1, adata->id); 920 if (tap_nlattr_nested_start(msg, TCA_ACT_OPTIONS) < 0) 921 return -1; 922 if (strcmp("gact", adata->id) == 0) { 923 tap_nlattr_add(&msg->nh, TCA_GACT_PARMS, sizeof(adata->gact), 924 &adata->gact); 925 } else if (strcmp("mirred", adata->id) == 0) { 926 if (adata->mirred.eaction == TCA_EGRESS_MIRROR) 927 adata->mirred.action = TC_ACT_PIPE; 928 else /* REDIRECT */ 929 adata->mirred.action = TC_ACT_STOLEN; 930 tap_nlattr_add(&msg->nh, TCA_MIRRED_PARMS, 931 sizeof(adata->mirred), 932 &adata->mirred); 933 } else if (strcmp("skbedit", adata->id) == 0) { 934 tap_nlattr_add(&msg->nh, TCA_SKBEDIT_PARMS, 935 sizeof(adata->skbedit.skbedit), 936 &adata->skbedit.skbedit); 937 tap_nlattr_add16(&msg->nh, TCA_SKBEDIT_QUEUE_MAPPING, 938 adata->skbedit.queue); 939 } else if (strcmp("bpf", adata->id) == 0) { 940 tap_nlattr_add32(&msg->nh, TCA_ACT_BPF_FD, adata->bpf.bpf_fd); 941 tap_nlattr_add(&msg->nh, TCA_ACT_BPF_NAME, 942 strlen(adata->bpf.annotation) + 1, 943 adata->bpf.annotation); 944 tap_nlattr_add(&msg->nh, TCA_ACT_BPF_PARMS, 945 sizeof(adata->bpf.bpf), 946 &adata->bpf.bpf); 947 } else { 948 return -1; 949 } 950 tap_nlattr_nested_finish(msg); /* nested TCA_ACT_OPTIONS */ 951 tap_nlattr_nested_finish(msg); /* nested act_index */ 952 return 0; 953 } 954 955 /** 956 * Helper function to send a serie of TC actions to the kernel 957 * 958 * @param[in] flow 959 * Pointer to rte flow containing the netlink message 960 * 961 * @param[in] nb_actions 962 * Number of actions in an array of action structs 963 * 964 * @param[in] data 965 * Pointer to an array of action structs 966 * 967 * @param[in] classifier_actions 968 * The classifier on behave of which the actions are configured 969 * 970 * @return 971 * -1 on failure, 0 on success 972 */ 973 static int 974 add_actions(struct rte_flow *flow, int nb_actions, struct action_data *data, 975 int classifier_action) 976 { 977 struct nlmsg *msg = &flow->msg; 978 size_t act_index = 1; 979 int i; 980 981 if (tap_nlattr_nested_start(msg, classifier_action) < 0) 982 return -1; 983 for (i = 0; i < nb_actions; i++) 984 if (add_action(flow, &act_index, data + i) < 0) 985 return -1; 986 tap_nlattr_nested_finish(msg); /* nested TCA_FLOWER_ACT */ 987 return 0; 988 } 989 990 /** 991 * Validate a flow supported by TC. 992 * If flow param is not NULL, then also fill the netlink message inside. 993 * 994 * @param pmd 995 * Pointer to private structure. 996 * @param[in] attr 997 * Flow rule attributes. 998 * @param[in] pattern 999 * Pattern specification (list terminated by the END pattern item). 1000 * @param[in] actions 1001 * Associated actions (list terminated by the END action). 1002 * @param[out] error 1003 * Perform verbose error reporting if not NULL. 1004 * @param[in, out] flow 1005 * Flow structure to update. 1006 * @param[in] mirred 1007 * If set to TCA_EGRESS_REDIR, provided actions will be replaced with a 1008 * redirection to the tap netdevice, and the TC rule will be configured 1009 * on the remote netdevice in pmd. 1010 * If set to TCA_EGRESS_MIRROR, provided actions will be replaced with a 1011 * mirroring to the tap netdevice, and the TC rule will be configured 1012 * on the remote netdevice in pmd. Matching packets will thus be duplicated. 1013 * If set to 0, the standard behavior is to be used: set correct actions for 1014 * the TC rule, and apply it on the tap netdevice. 1015 * 1016 * @return 1017 * 0 on success, a negative errno value otherwise and rte_errno is set. 1018 */ 1019 static int 1020 priv_flow_process(struct pmd_internals *pmd, 1021 const struct rte_flow_attr *attr, 1022 const struct rte_flow_item items[], 1023 const struct rte_flow_action actions[], 1024 struct rte_flow_error *error, 1025 struct rte_flow *flow, 1026 int mirred) 1027 { 1028 const struct tap_flow_items *cur_item = tap_flow_items; 1029 struct convert_data data = { 1030 .eth_type = 0, 1031 .ip_proto = 0, 1032 .flow = flow, 1033 }; 1034 int action = 0; /* Only one action authorized for now */ 1035 1036 if (attr->group > MAX_GROUP) { 1037 rte_flow_error_set( 1038 error, EINVAL, RTE_FLOW_ERROR_TYPE_ATTR_GROUP, 1039 NULL, "group value too big: cannot exceed 15"); 1040 return -rte_errno; 1041 } 1042 if (attr->priority > MAX_PRIORITY) { 1043 rte_flow_error_set( 1044 error, EINVAL, RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, 1045 NULL, "priority value too big"); 1046 return -rte_errno; 1047 } else if (flow) { 1048 uint16_t group = attr->group << GROUP_SHIFT; 1049 uint16_t prio = group | (attr->priority + 1050 RSS_PRIORITY_OFFSET + PRIORITY_OFFSET); 1051 flow->msg.t.tcm_info = TC_H_MAKE(prio << 16, 1052 flow->msg.t.tcm_info); 1053 } 1054 if (flow) { 1055 if (mirred) { 1056 /* 1057 * If attr->ingress, the rule applies on remote ingress 1058 * to match incoming packets 1059 * If attr->egress, the rule applies on tap ingress (as 1060 * seen from the kernel) to deal with packets going out 1061 * from the DPDK app. 1062 */ 1063 flow->msg.t.tcm_parent = TC_H_MAKE(TC_H_INGRESS, 0); 1064 } else { 1065 /* Standard rule on tap egress (kernel standpoint). */ 1066 flow->msg.t.tcm_parent = 1067 TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0); 1068 } 1069 /* use flower filter type */ 1070 tap_nlattr_add(&flow->msg.nh, TCA_KIND, sizeof("flower"), "flower"); 1071 if (tap_nlattr_nested_start(&flow->msg, TCA_OPTIONS) < 0) 1072 goto exit_item_not_supported; 1073 } 1074 for (; items->type != RTE_FLOW_ITEM_TYPE_END; ++items) { 1075 const struct tap_flow_items *token = NULL; 1076 unsigned int i; 1077 int err = 0; 1078 1079 if (items->type == RTE_FLOW_ITEM_TYPE_VOID) 1080 continue; 1081 for (i = 0; 1082 cur_item->items && 1083 cur_item->items[i] != RTE_FLOW_ITEM_TYPE_END; 1084 ++i) { 1085 if (cur_item->items[i] == items->type) { 1086 token = &tap_flow_items[items->type]; 1087 break; 1088 } 1089 } 1090 if (!token) 1091 goto exit_item_not_supported; 1092 cur_item = token; 1093 err = tap_flow_item_validate( 1094 items, cur_item->mask_sz, 1095 (const uint8_t *)cur_item->mask, 1096 (const uint8_t *)cur_item->default_mask); 1097 if (err) 1098 goto exit_item_not_supported; 1099 if (flow && cur_item->convert) { 1100 err = cur_item->convert(items, &data); 1101 if (err) 1102 goto exit_item_not_supported; 1103 } 1104 } 1105 if (flow) { 1106 if (data.vlan) { 1107 tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE, 1108 htons(ETH_P_8021Q)); 1109 tap_nlattr_add16(&flow->msg.nh, 1110 TCA_FLOWER_KEY_VLAN_ETH_TYPE, 1111 data.eth_type ? 1112 data.eth_type : htons(ETH_P_ALL)); 1113 } else if (data.eth_type) { 1114 tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE, 1115 data.eth_type); 1116 } 1117 } 1118 if (mirred && flow) { 1119 struct action_data adata = { 1120 .id = "mirred", 1121 .mirred = { 1122 .eaction = mirred, 1123 }, 1124 }; 1125 1126 /* 1127 * If attr->egress && mirred, then this is a special 1128 * case where the rule must be applied on the tap, to 1129 * redirect packets coming from the DPDK App, out 1130 * through the remote netdevice. 1131 */ 1132 adata.mirred.ifindex = attr->ingress ? pmd->if_index : 1133 pmd->remote_if_index; 1134 if (mirred == TCA_EGRESS_MIRROR) 1135 adata.mirred.action = TC_ACT_PIPE; 1136 else 1137 adata.mirred.action = TC_ACT_STOLEN; 1138 if (add_actions(flow, 1, &adata, TCA_FLOWER_ACT) < 0) 1139 goto exit_action_not_supported; 1140 else 1141 goto end; 1142 } 1143 for (; actions->type != RTE_FLOW_ACTION_TYPE_END; ++actions) { 1144 int err = 0; 1145 1146 if (actions->type == RTE_FLOW_ACTION_TYPE_VOID) { 1147 continue; 1148 } else if (actions->type == RTE_FLOW_ACTION_TYPE_DROP) { 1149 if (action) 1150 goto exit_action_not_supported; 1151 action = 1; 1152 if (flow) { 1153 struct action_data adata = { 1154 .id = "gact", 1155 .gact = { 1156 .action = TC_ACT_SHOT, 1157 }, 1158 }; 1159 1160 err = add_actions(flow, 1, &adata, 1161 TCA_FLOWER_ACT); 1162 } 1163 } else if (actions->type == RTE_FLOW_ACTION_TYPE_PASSTHRU) { 1164 if (action) 1165 goto exit_action_not_supported; 1166 action = 1; 1167 if (flow) { 1168 struct action_data adata = { 1169 .id = "gact", 1170 .gact = { 1171 /* continue */ 1172 .action = TC_ACT_UNSPEC, 1173 }, 1174 }; 1175 1176 err = add_actions(flow, 1, &adata, 1177 TCA_FLOWER_ACT); 1178 } 1179 } else if (actions->type == RTE_FLOW_ACTION_TYPE_QUEUE) { 1180 const struct rte_flow_action_queue *queue = 1181 (const struct rte_flow_action_queue *) 1182 actions->conf; 1183 1184 if (action) 1185 goto exit_action_not_supported; 1186 action = 1; 1187 if (!queue || 1188 (queue->index > pmd->dev->data->nb_rx_queues - 1)) 1189 goto exit_action_not_supported; 1190 if (flow) { 1191 struct action_data adata = { 1192 .id = "skbedit", 1193 .skbedit = { 1194 .skbedit = { 1195 .action = TC_ACT_PIPE, 1196 }, 1197 .queue = queue->index, 1198 }, 1199 }; 1200 1201 err = add_actions(flow, 1, &adata, 1202 TCA_FLOWER_ACT); 1203 } 1204 } else if (actions->type == RTE_FLOW_ACTION_TYPE_RSS) { 1205 const struct rte_flow_action_rss *rss = 1206 (const struct rte_flow_action_rss *) 1207 actions->conf; 1208 1209 if (action++) 1210 goto exit_action_not_supported; 1211 1212 if (!pmd->rss_enabled) { 1213 err = rss_enable(pmd, attr, error); 1214 if (err) 1215 goto exit_action_not_supported; 1216 } 1217 if (flow && rss) 1218 err = rss_add_actions(flow, pmd, rss, error); 1219 } else { 1220 goto exit_action_not_supported; 1221 } 1222 if (err) 1223 goto exit_action_not_supported; 1224 } 1225 end: 1226 if (flow) 1227 tap_nlattr_nested_finish(&flow->msg); /* nested TCA_OPTIONS */ 1228 return 0; 1229 exit_item_not_supported: 1230 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, 1231 items, "item not supported"); 1232 return -rte_errno; 1233 exit_action_not_supported: 1234 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ACTION, 1235 actions, "action not supported"); 1236 return -rte_errno; 1237 } 1238 1239 1240 1241 /** 1242 * Validate a flow. 1243 * 1244 * @see rte_flow_validate() 1245 * @see rte_flow_ops 1246 */ 1247 static int 1248 tap_flow_validate(struct rte_eth_dev *dev, 1249 const struct rte_flow_attr *attr, 1250 const struct rte_flow_item items[], 1251 const struct rte_flow_action actions[], 1252 struct rte_flow_error *error) 1253 { 1254 struct pmd_internals *pmd = dev->data->dev_private; 1255 1256 return priv_flow_process(pmd, attr, items, actions, error, NULL, 0); 1257 } 1258 1259 /** 1260 * Set a unique handle in a flow. 1261 * 1262 * The kernel supports TC rules with equal priority, as long as they use the 1263 * same matching fields (e.g.: dst mac and ipv4) with different values (and 1264 * full mask to ensure no collision is possible). 1265 * In those rules, the handle (uint32_t) is the part that would identify 1266 * specifically each rule. 1267 * 1268 * On 32-bit architectures, the handle can simply be the flow's pointer address. 1269 * On 64-bit architectures, we rely on jhash(flow) to find a (sufficiently) 1270 * unique handle. 1271 * 1272 * @param[in, out] flow 1273 * The flow that needs its handle set. 1274 */ 1275 static void 1276 tap_flow_set_handle(struct rte_flow *flow) 1277 { 1278 uint32_t handle = 0; 1279 1280 if (sizeof(flow) > 4) 1281 handle = rte_jhash(&flow, sizeof(flow), 1); 1282 else 1283 handle = (uintptr_t)flow; 1284 /* must be at least 1 to avoid letting the kernel choose one for us */ 1285 if (!handle) 1286 handle = 1; 1287 flow->msg.t.tcm_handle = handle; 1288 } 1289 1290 /** 1291 * Free the flow opened file descriptors and allocated memory 1292 * 1293 * @param[in] flow 1294 * Pointer to the flow to free 1295 * 1296 */ 1297 static void 1298 tap_flow_free(struct pmd_internals *pmd, struct rte_flow *flow) 1299 { 1300 int i; 1301 1302 if (!flow) 1303 return; 1304 1305 if (pmd->rss_enabled) { 1306 /* Close flow BPF file descriptors */ 1307 for (i = 0; i < SEC_MAX; i++) 1308 if (flow->bpf_fd[i] != 0) { 1309 close(flow->bpf_fd[i]); 1310 flow->bpf_fd[i] = 0; 1311 } 1312 1313 /* Release the map key for this RSS rule */ 1314 bpf_rss_key(KEY_CMD_RELEASE, &flow->key_idx); 1315 flow->key_idx = 0; 1316 } 1317 1318 /* Free flow allocated memory */ 1319 rte_free(flow); 1320 } 1321 1322 /** 1323 * Create a flow. 1324 * 1325 * @see rte_flow_create() 1326 * @see rte_flow_ops 1327 */ 1328 static struct rte_flow * 1329 tap_flow_create(struct rte_eth_dev *dev, 1330 const struct rte_flow_attr *attr, 1331 const struct rte_flow_item items[], 1332 const struct rte_flow_action actions[], 1333 struct rte_flow_error *error) 1334 { 1335 struct pmd_internals *pmd = dev->data->dev_private; 1336 struct rte_flow *remote_flow = NULL; 1337 struct rte_flow *flow = NULL; 1338 struct nlmsg *msg = NULL; 1339 int err; 1340 1341 if (!pmd->if_index) { 1342 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1343 NULL, 1344 "can't create rule, ifindex not found"); 1345 goto fail; 1346 } 1347 /* 1348 * No rules configured through standard rte_flow should be set on the 1349 * priorities used by implicit rules. 1350 */ 1351 if ((attr->group == MAX_GROUP) && 1352 attr->priority > (MAX_PRIORITY - TAP_REMOTE_MAX_IDX)) { 1353 rte_flow_error_set( 1354 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, 1355 NULL, "priority value too big"); 1356 goto fail; 1357 } 1358 flow = rte_malloc(__func__, sizeof(struct rte_flow), 0); 1359 if (!flow) { 1360 rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1361 NULL, "cannot allocate memory for rte_flow"); 1362 goto fail; 1363 } 1364 msg = &flow->msg; 1365 tc_init_msg(msg, pmd->if_index, RTM_NEWTFILTER, 1366 NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1367 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1368 tap_flow_set_handle(flow); 1369 if (priv_flow_process(pmd, attr, items, actions, error, flow, 0)) 1370 goto fail; 1371 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1372 if (err < 0) { 1373 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1374 NULL, "couldn't send request to kernel"); 1375 goto fail; 1376 } 1377 err = tap_nl_recv_ack(pmd->nlsk_fd); 1378 if (err < 0) { 1379 RTE_LOG(ERR, PMD, 1380 "Kernel refused TC filter rule creation (%d): %s\n", 1381 errno, strerror(errno)); 1382 rte_flow_error_set(error, EEXIST, RTE_FLOW_ERROR_TYPE_HANDLE, 1383 NULL, 1384 "overlapping rules or Kernel too old for flower support"); 1385 goto fail; 1386 } 1387 LIST_INSERT_HEAD(&pmd->flows, flow, next); 1388 /** 1389 * If a remote device is configured, a TC rule with identical items for 1390 * matching must be set on that device, with a single action: redirect 1391 * to the local pmd->if_index. 1392 */ 1393 if (pmd->remote_if_index) { 1394 remote_flow = rte_malloc(__func__, sizeof(struct rte_flow), 0); 1395 if (!remote_flow) { 1396 rte_flow_error_set( 1397 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1398 "cannot allocate memory for rte_flow"); 1399 goto fail; 1400 } 1401 msg = &remote_flow->msg; 1402 /* set the rule if_index for the remote netdevice */ 1403 tc_init_msg( 1404 msg, pmd->remote_if_index, RTM_NEWTFILTER, 1405 NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1406 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1407 tap_flow_set_handle(remote_flow); 1408 if (priv_flow_process(pmd, attr, items, NULL, 1409 error, remote_flow, TCA_EGRESS_REDIR)) { 1410 rte_flow_error_set( 1411 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1412 NULL, "rte flow rule validation failed"); 1413 goto fail; 1414 } 1415 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1416 if (err < 0) { 1417 rte_flow_error_set( 1418 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1419 NULL, "Failure sending nl request"); 1420 goto fail; 1421 } 1422 err = tap_nl_recv_ack(pmd->nlsk_fd); 1423 if (err < 0) { 1424 RTE_LOG(ERR, PMD, 1425 "Kernel refused TC filter rule creation (%d): %s\n", 1426 errno, strerror(errno)); 1427 rte_flow_error_set( 1428 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1429 NULL, 1430 "overlapping rules or Kernel too old for flower support"); 1431 goto fail; 1432 } 1433 flow->remote_flow = remote_flow; 1434 } 1435 return flow; 1436 fail: 1437 if (remote_flow) 1438 rte_free(remote_flow); 1439 if (flow) 1440 tap_flow_free(pmd, flow); 1441 return NULL; 1442 } 1443 1444 /** 1445 * Destroy a flow using pointer to pmd_internal. 1446 * 1447 * @param[in, out] pmd 1448 * Pointer to private structure. 1449 * @param[in] flow 1450 * Pointer to the flow to destroy. 1451 * @param[in, out] error 1452 * Pointer to the flow error handler 1453 * 1454 * @return 0 if the flow could be destroyed, -1 otherwise. 1455 */ 1456 static int 1457 tap_flow_destroy_pmd(struct pmd_internals *pmd, 1458 struct rte_flow *flow, 1459 struct rte_flow_error *error) 1460 { 1461 struct rte_flow *remote_flow = flow->remote_flow; 1462 int ret = 0; 1463 1464 LIST_REMOVE(flow, next); 1465 flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; 1466 flow->msg.nh.nlmsg_type = RTM_DELTFILTER; 1467 1468 ret = tap_nl_send(pmd->nlsk_fd, &flow->msg.nh); 1469 if (ret < 0) { 1470 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1471 NULL, "couldn't send request to kernel"); 1472 goto end; 1473 } 1474 ret = tap_nl_recv_ack(pmd->nlsk_fd); 1475 /* If errno is ENOENT, the rule is already no longer in the kernel. */ 1476 if (ret < 0 && errno == ENOENT) 1477 ret = 0; 1478 if (ret < 0) { 1479 RTE_LOG(ERR, PMD, 1480 "Kernel refused TC filter rule deletion (%d): %s\n", 1481 errno, strerror(errno)); 1482 rte_flow_error_set( 1483 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1484 "couldn't receive kernel ack to our request"); 1485 goto end; 1486 } 1487 1488 if (remote_flow) { 1489 remote_flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; 1490 remote_flow->msg.nh.nlmsg_type = RTM_DELTFILTER; 1491 1492 ret = tap_nl_send(pmd->nlsk_fd, &remote_flow->msg.nh); 1493 if (ret < 0) { 1494 rte_flow_error_set( 1495 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1496 NULL, "Failure sending nl request"); 1497 goto end; 1498 } 1499 ret = tap_nl_recv_ack(pmd->nlsk_fd); 1500 if (ret < 0 && errno == ENOENT) 1501 ret = 0; 1502 if (ret < 0) { 1503 RTE_LOG(ERR, PMD, 1504 "Kernel refused TC filter rule deletion (%d): %s\n", 1505 errno, strerror(errno)); 1506 rte_flow_error_set( 1507 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1508 NULL, "Failure trying to receive nl ack"); 1509 goto end; 1510 } 1511 } 1512 end: 1513 if (remote_flow) 1514 rte_free(remote_flow); 1515 tap_flow_free(pmd, flow); 1516 return ret; 1517 } 1518 1519 /** 1520 * Destroy a flow. 1521 * 1522 * @see rte_flow_destroy() 1523 * @see rte_flow_ops 1524 */ 1525 static int 1526 tap_flow_destroy(struct rte_eth_dev *dev, 1527 struct rte_flow *flow, 1528 struct rte_flow_error *error) 1529 { 1530 struct pmd_internals *pmd = dev->data->dev_private; 1531 1532 return tap_flow_destroy_pmd(pmd, flow, error); 1533 } 1534 1535 /** 1536 * Enable/disable flow isolation. 1537 * 1538 * @see rte_flow_isolate() 1539 * @see rte_flow_ops 1540 */ 1541 static int 1542 tap_flow_isolate(struct rte_eth_dev *dev, 1543 int set, 1544 struct rte_flow_error *error __rte_unused) 1545 { 1546 struct pmd_internals *pmd = dev->data->dev_private; 1547 1548 if (set) 1549 pmd->flow_isolate = 1; 1550 else 1551 pmd->flow_isolate = 0; 1552 /* 1553 * If netdevice is there, setup appropriate flow rules immediately. 1554 * Otherwise it will be set when bringing up the netdevice (tun_alloc). 1555 */ 1556 if (!pmd->rxq[0].fd) 1557 return 0; 1558 if (set) { 1559 struct rte_flow *flow; 1560 1561 while (1) { 1562 flow = LIST_FIRST(&pmd->implicit_flows); 1563 if (!flow) 1564 break; 1565 /* 1566 * Remove all implicit rules on the remote. 1567 * Keep the local rule to redirect packets on TX. 1568 * Keep also the last implicit local rule: ISOLATE. 1569 */ 1570 if (flow->msg.t.tcm_ifindex == pmd->if_index) 1571 break; 1572 if (tap_flow_destroy_pmd(pmd, flow, NULL) < 0) 1573 goto error; 1574 } 1575 /* Switch the TC rule according to pmd->flow_isolate */ 1576 if (tap_flow_implicit_create(pmd, TAP_ISOLATE) == -1) 1577 goto error; 1578 } else { 1579 /* Switch the TC rule according to pmd->flow_isolate */ 1580 if (tap_flow_implicit_create(pmd, TAP_ISOLATE) == -1) 1581 goto error; 1582 if (!pmd->remote_if_index) 1583 return 0; 1584 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0) 1585 goto error; 1586 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0) 1587 goto error; 1588 if (tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0) 1589 goto error; 1590 if (tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) 1591 goto error; 1592 if (dev->data->promiscuous && 1593 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC) < 0) 1594 goto error; 1595 if (dev->data->all_multicast && 1596 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI) < 0) 1597 goto error; 1598 } 1599 return 0; 1600 error: 1601 pmd->flow_isolate = 0; 1602 return rte_flow_error_set( 1603 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, 1604 "TC rule creation failed"); 1605 } 1606 1607 /** 1608 * Destroy all flows. 1609 * 1610 * @see rte_flow_flush() 1611 * @see rte_flow_ops 1612 */ 1613 int 1614 tap_flow_flush(struct rte_eth_dev *dev, struct rte_flow_error *error) 1615 { 1616 struct pmd_internals *pmd = dev->data->dev_private; 1617 struct rte_flow *flow; 1618 1619 while (!LIST_EMPTY(&pmd->flows)) { 1620 flow = LIST_FIRST(&pmd->flows); 1621 if (tap_flow_destroy(dev, flow, error) < 0) 1622 return -1; 1623 } 1624 return 0; 1625 } 1626 1627 /** 1628 * Add an implicit flow rule on the remote device to make sure traffic gets to 1629 * the tap netdevice from there. 1630 * 1631 * @param pmd 1632 * Pointer to private structure. 1633 * @param[in] idx 1634 * The idx in the implicit_rte_flows array specifying which rule to apply. 1635 * 1636 * @return -1 if the rule couldn't be applied, 0 otherwise. 1637 */ 1638 int tap_flow_implicit_create(struct pmd_internals *pmd, 1639 enum implicit_rule_index idx) 1640 { 1641 uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE; 1642 struct rte_flow_action *actions = implicit_rte_flows[idx].actions; 1643 struct rte_flow_action isolate_actions[2] = { 1644 [1] = { 1645 .type = RTE_FLOW_ACTION_TYPE_END, 1646 }, 1647 }; 1648 struct rte_flow_item *items = implicit_rte_flows[idx].items; 1649 struct rte_flow_attr *attr = &implicit_rte_flows[idx].attr; 1650 struct rte_flow_item_eth eth_local = { .type = 0 }; 1651 uint16_t if_index = pmd->remote_if_index; 1652 struct rte_flow *remote_flow = NULL; 1653 struct nlmsg *msg = NULL; 1654 int err = 0; 1655 struct rte_flow_item items_local[2] = { 1656 [0] = { 1657 .type = items[0].type, 1658 .spec = ð_local, 1659 .mask = items[0].mask, 1660 }, 1661 [1] = { 1662 .type = items[1].type, 1663 } 1664 }; 1665 1666 remote_flow = rte_malloc(__func__, sizeof(struct rte_flow), 0); 1667 if (!remote_flow) { 1668 RTE_LOG(ERR, PMD, "Cannot allocate memory for rte_flow\n"); 1669 goto fail; 1670 } 1671 msg = &remote_flow->msg; 1672 if (idx == TAP_REMOTE_TX) { 1673 if_index = pmd->if_index; 1674 } else if (idx == TAP_ISOLATE) { 1675 if_index = pmd->if_index; 1676 /* Don't be exclusive for this rule, it can be changed later. */ 1677 flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE; 1678 isolate_actions[0].type = pmd->flow_isolate ? 1679 RTE_FLOW_ACTION_TYPE_DROP : 1680 RTE_FLOW_ACTION_TYPE_PASSTHRU; 1681 actions = isolate_actions; 1682 } else if (idx == TAP_REMOTE_LOCAL_MAC) { 1683 /* 1684 * eth addr couldn't be set in implicit_rte_flows[] as it is not 1685 * known at compile time. 1686 */ 1687 memcpy(ð_local.dst, &pmd->eth_addr, sizeof(pmd->eth_addr)); 1688 items = items_local; 1689 } 1690 tc_init_msg(msg, if_index, RTM_NEWTFILTER, flags); 1691 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1692 /* 1693 * The ISOLATE rule is always present and must have a static handle, as 1694 * the action is changed whether the feature is enabled (DROP) or 1695 * disabled (PASSTHRU). 1696 * There is just one REMOTE_PROMISCUOUS rule in all cases. It should 1697 * have a static handle such that adding it twice will fail with EEXIST 1698 * with any kernel version. Remark: old kernels may falsely accept the 1699 * same REMOTE_PROMISCUOUS rules if they had different handles. 1700 */ 1701 if (idx == TAP_ISOLATE) 1702 remote_flow->msg.t.tcm_handle = ISOLATE_HANDLE; 1703 else if (idx == TAP_REMOTE_PROMISC) 1704 remote_flow->msg.t.tcm_handle = REMOTE_PROMISCUOUS_HANDLE; 1705 else 1706 tap_flow_set_handle(remote_flow); 1707 if (priv_flow_process(pmd, attr, items, actions, NULL, 1708 remote_flow, implicit_rte_flows[idx].mirred)) { 1709 RTE_LOG(ERR, PMD, "rte flow rule validation failed\n"); 1710 goto fail; 1711 } 1712 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1713 if (err < 0) { 1714 RTE_LOG(ERR, PMD, "Failure sending nl request\n"); 1715 goto fail; 1716 } 1717 err = tap_nl_recv_ack(pmd->nlsk_fd); 1718 if (err < 0) { 1719 /* Silently ignore re-entering remote promiscuous rule */ 1720 if (errno == EEXIST && idx == TAP_REMOTE_PROMISC) 1721 goto success; 1722 RTE_LOG(ERR, PMD, 1723 "Kernel refused TC filter rule creation (%d): %s\n", 1724 errno, strerror(errno)); 1725 goto fail; 1726 } 1727 LIST_INSERT_HEAD(&pmd->implicit_flows, remote_flow, next); 1728 success: 1729 return 0; 1730 fail: 1731 if (remote_flow) 1732 rte_free(remote_flow); 1733 return -1; 1734 } 1735 1736 /** 1737 * Remove specific implicit flow rule on the remote device. 1738 * 1739 * @param[in, out] pmd 1740 * Pointer to private structure. 1741 * @param[in] idx 1742 * The idx in the implicit_rte_flows array specifying which rule to remove. 1743 * 1744 * @return -1 if one of the implicit rules couldn't be created, 0 otherwise. 1745 */ 1746 int tap_flow_implicit_destroy(struct pmd_internals *pmd, 1747 enum implicit_rule_index idx) 1748 { 1749 struct rte_flow *remote_flow; 1750 int cur_prio = -1; 1751 int idx_prio = implicit_rte_flows[idx].attr.priority + PRIORITY_OFFSET; 1752 1753 for (remote_flow = LIST_FIRST(&pmd->implicit_flows); 1754 remote_flow; 1755 remote_flow = LIST_NEXT(remote_flow, next)) { 1756 cur_prio = (remote_flow->msg.t.tcm_info >> 16) & PRIORITY_MASK; 1757 if (cur_prio != idx_prio) 1758 continue; 1759 return tap_flow_destroy_pmd(pmd, remote_flow, NULL); 1760 } 1761 return 0; 1762 } 1763 1764 /** 1765 * Destroy all implicit flows. 1766 * 1767 * @see rte_flow_flush() 1768 */ 1769 int 1770 tap_flow_implicit_flush(struct pmd_internals *pmd, struct rte_flow_error *error) 1771 { 1772 struct rte_flow *remote_flow; 1773 1774 while (!LIST_EMPTY(&pmd->implicit_flows)) { 1775 remote_flow = LIST_FIRST(&pmd->implicit_flows); 1776 if (tap_flow_destroy_pmd(pmd, remote_flow, error) < 0) 1777 return -1; 1778 } 1779 return 0; 1780 } 1781 1782 #define MAX_RSS_KEYS 256 1783 #define KEY_IDX_OFFSET (3 * MAX_RSS_KEYS) 1784 #define SEC_NAME_CLS_Q "cls_q" 1785 1786 const char *sec_name[SEC_MAX] = { 1787 [SEC_L3_L4] = "l3_l4", 1788 }; 1789 1790 /** 1791 * Enable RSS on tap: create TC rules for queuing. 1792 * 1793 * @param[in, out] pmd 1794 * Pointer to private structure. 1795 * 1796 * @param[in] attr 1797 * Pointer to rte_flow to get flow group 1798 * 1799 * @param[out] error 1800 * Pointer to error reporting if not NULL. 1801 * 1802 * @return 0 on success, negative value on failure. 1803 */ 1804 static int rss_enable(struct pmd_internals *pmd, 1805 const struct rte_flow_attr *attr, 1806 struct rte_flow_error *error) 1807 { 1808 struct rte_flow *rss_flow = NULL; 1809 struct nlmsg *msg = NULL; 1810 /* 4096 is the maximum number of instructions for a BPF program */ 1811 char annotation[64]; 1812 int i; 1813 int err = 0; 1814 1815 /* unlimit locked memory */ 1816 struct rlimit memlock_limit = { 1817 .rlim_cur = RLIM_INFINITY, 1818 .rlim_max = RLIM_INFINITY, 1819 }; 1820 setrlimit(RLIMIT_MEMLOCK, &memlock_limit); 1821 1822 /* Get a new map key for a new RSS rule */ 1823 err = bpf_rss_key(KEY_CMD_INIT, NULL); 1824 if (err < 0) { 1825 rte_flow_error_set( 1826 error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1827 "Failed to initialize BPF RSS keys"); 1828 1829 return -1; 1830 } 1831 1832 /* 1833 * Create BPF RSS MAP 1834 */ 1835 pmd->map_fd = tap_flow_bpf_rss_map_create(sizeof(__u32), /* key size */ 1836 sizeof(struct rss_key), 1837 MAX_RSS_KEYS); 1838 if (pmd->map_fd < 0) { 1839 RTE_LOG(ERR, PMD, 1840 "Failed to create BPF map (%d): %s\n", 1841 errno, strerror(errno)); 1842 rte_flow_error_set( 1843 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1844 "Kernel too old or not configured " 1845 "to support BPF maps"); 1846 1847 return -ENOTSUP; 1848 } 1849 1850 /* 1851 * Add a rule per queue to match reclassified packets and direct them to 1852 * the correct queue. 1853 */ 1854 for (i = 0; i < pmd->dev->data->nb_rx_queues; i++) { 1855 pmd->bpf_fd[i] = tap_flow_bpf_cls_q(i); 1856 if (pmd->bpf_fd[i] < 0) { 1857 RTE_LOG(ERR, PMD, 1858 "Failed to load BPF section %s for queue %d", 1859 SEC_NAME_CLS_Q, i); 1860 rte_flow_error_set( 1861 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1862 NULL, 1863 "Kernel too old or not configured " 1864 "to support BPF programs loading"); 1865 1866 return -ENOTSUP; 1867 } 1868 1869 rss_flow = rte_malloc(__func__, sizeof(struct rte_flow), 0); 1870 if (!rss_flow) { 1871 RTE_LOG(ERR, PMD, 1872 "Cannot allocate memory for rte_flow"); 1873 return -1; 1874 } 1875 msg = &rss_flow->msg; 1876 tc_init_msg(msg, pmd->if_index, RTM_NEWTFILTER, NLM_F_REQUEST | 1877 NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1878 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1879 tap_flow_set_handle(rss_flow); 1880 uint16_t group = attr->group << GROUP_SHIFT; 1881 uint16_t prio = group | (i + PRIORITY_OFFSET); 1882 msg->t.tcm_info = TC_H_MAKE(prio << 16, msg->t.tcm_info); 1883 msg->t.tcm_parent = TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0); 1884 1885 tap_nlattr_add(&msg->nh, TCA_KIND, sizeof("bpf"), "bpf"); 1886 if (tap_nlattr_nested_start(msg, TCA_OPTIONS) < 0) 1887 return -1; 1888 tap_nlattr_add32(&msg->nh, TCA_BPF_FD, pmd->bpf_fd[i]); 1889 snprintf(annotation, sizeof(annotation), "[%s%d]", 1890 SEC_NAME_CLS_Q, i); 1891 tap_nlattr_add(&msg->nh, TCA_BPF_NAME, strlen(annotation) + 1, 1892 annotation); 1893 /* Actions */ 1894 { 1895 struct action_data adata = { 1896 .id = "skbedit", 1897 .skbedit = { 1898 .skbedit = { 1899 .action = TC_ACT_PIPE, 1900 }, 1901 .queue = i, 1902 }, 1903 }; 1904 if (add_actions(rss_flow, 1, &adata, TCA_BPF_ACT) < 0) 1905 return -1; 1906 } 1907 tap_nlattr_nested_finish(msg); /* nested TCA_OPTIONS */ 1908 1909 /* Netlink message is now ready to be sent */ 1910 if (tap_nl_send(pmd->nlsk_fd, &msg->nh) < 0) 1911 return -1; 1912 err = tap_nl_recv_ack(pmd->nlsk_fd); 1913 if (err < 0) { 1914 RTE_LOG(ERR, PMD, 1915 "Kernel refused TC filter rule creation (%d): %s\n", 1916 errno, strerror(errno)); 1917 return err; 1918 } 1919 LIST_INSERT_HEAD(&pmd->rss_flows, rss_flow, next); 1920 } 1921 1922 pmd->rss_enabled = 1; 1923 return err; 1924 } 1925 1926 /** 1927 * Manage bpf RSS keys repository with operations: init, get, release 1928 * 1929 * @param[in] cmd 1930 * Command on RSS keys: init, get, release 1931 * 1932 * @param[in, out] key_idx 1933 * Pointer to RSS Key index (out for get command, in for release command) 1934 * 1935 * @return -1 if couldn't get, release or init the RSS keys, 0 otherwise. 1936 */ 1937 static int bpf_rss_key(enum bpf_rss_key_e cmd, __u32 *key_idx) 1938 { 1939 __u32 i; 1940 int err = 0; 1941 static __u32 num_used_keys; 1942 static __u32 rss_keys[MAX_RSS_KEYS] = {KEY_STAT_UNSPEC}; 1943 static __u32 rss_keys_initialized; 1944 __u32 key; 1945 1946 switch (cmd) { 1947 case KEY_CMD_GET: 1948 if (!rss_keys_initialized) { 1949 err = -1; 1950 break; 1951 } 1952 1953 if (num_used_keys == RTE_DIM(rss_keys)) { 1954 err = -1; 1955 break; 1956 } 1957 1958 *key_idx = num_used_keys % RTE_DIM(rss_keys); 1959 while (rss_keys[*key_idx] == KEY_STAT_USED) 1960 *key_idx = (*key_idx + 1) % RTE_DIM(rss_keys); 1961 1962 rss_keys[*key_idx] = KEY_STAT_USED; 1963 1964 /* 1965 * Add an offset to key_idx in order to handle a case of 1966 * RSS and non RSS flows mixture. 1967 * If a non RSS flow is destroyed it has an eBPF map 1968 * index 0 (initialized on flow creation) and might 1969 * unintentionally remove RSS entry 0 from eBPF map. 1970 * To avoid this issue, add an offset to the real index 1971 * during a KEY_CMD_GET operation and subtract this offset 1972 * during a KEY_CMD_RELEASE operation in order to restore 1973 * the real index. 1974 */ 1975 *key_idx += KEY_IDX_OFFSET; 1976 num_used_keys++; 1977 break; 1978 1979 case KEY_CMD_RELEASE: 1980 if (!rss_keys_initialized) 1981 break; 1982 1983 /* 1984 * Subtract offest to restore real key index 1985 * If a non RSS flow is falsely trying to release map 1986 * entry 0 - the offset subtraction will calculate the real 1987 * map index as an out-of-range value and the release operation 1988 * will be silently ignored. 1989 */ 1990 key = *key_idx - KEY_IDX_OFFSET; 1991 if (key >= RTE_DIM(rss_keys)) 1992 break; 1993 1994 if (rss_keys[key] == KEY_STAT_USED) { 1995 rss_keys[key] = KEY_STAT_AVAILABLE; 1996 num_used_keys--; 1997 } 1998 break; 1999 2000 case KEY_CMD_INIT: 2001 for (i = 0; i < RTE_DIM(rss_keys); i++) 2002 rss_keys[i] = KEY_STAT_AVAILABLE; 2003 2004 rss_keys_initialized = 1; 2005 num_used_keys = 0; 2006 break; 2007 2008 case KEY_CMD_DEINIT: 2009 for (i = 0; i < RTE_DIM(rss_keys); i++) 2010 rss_keys[i] = KEY_STAT_UNSPEC; 2011 2012 rss_keys_initialized = 0; 2013 num_used_keys = 0; 2014 break; 2015 2016 default: 2017 break; 2018 } 2019 2020 return err; 2021 } 2022 2023 /** 2024 * Add RSS hash calculations and queue selection 2025 * 2026 * @param[in, out] pmd 2027 * Pointer to internal structure. Used to set/get RSS map fd 2028 * 2029 * @param[in] rss 2030 * Pointer to RSS flow actions 2031 * 2032 * @param[out] error 2033 * Pointer to error reporting if not NULL. 2034 * 2035 * @return 0 on success, negative value on failure 2036 */ 2037 static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, 2038 const struct rte_flow_action_rss *rss, 2039 struct rte_flow_error *error) 2040 { 2041 /* 4096 is the maximum number of instructions for a BPF program */ 2042 int i; 2043 int err; 2044 struct rss_key rss_entry = { .hash_fields = 0, 2045 .key_size = 0 }; 2046 2047 /* Get a new map key for a new RSS rule */ 2048 err = bpf_rss_key(KEY_CMD_GET, &flow->key_idx); 2049 if (err < 0) { 2050 rte_flow_error_set( 2051 error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2052 "Failed to get BPF RSS key"); 2053 2054 return -1; 2055 } 2056 2057 /* Update RSS map entry with queues */ 2058 rss_entry.nb_queues = rss->num; 2059 for (i = 0; i < rss->num; i++) 2060 rss_entry.queues[i] = rss->queue[i]; 2061 rss_entry.hash_fields = 2062 (1 << HASH_FIELD_IPV4_L3_L4) | (1 << HASH_FIELD_IPV6_L3_L4); 2063 2064 /* Add this RSS entry to map */ 2065 err = tap_flow_bpf_update_rss_elem(pmd->map_fd, 2066 &flow->key_idx, &rss_entry); 2067 2068 if (err) { 2069 RTE_LOG(ERR, PMD, 2070 "Failed to update BPF map entry #%u (%d): %s\n", 2071 flow->key_idx, errno, strerror(errno)); 2072 rte_flow_error_set( 2073 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2074 "Kernel too old or not configured " 2075 "to support BPF maps updates"); 2076 2077 return -ENOTSUP; 2078 } 2079 2080 2081 /* 2082 * Load bpf rules to calculate hash for this key_idx 2083 */ 2084 2085 flow->bpf_fd[SEC_L3_L4] = 2086 tap_flow_bpf_calc_l3_l4_hash(flow->key_idx, pmd->map_fd); 2087 if (flow->bpf_fd[SEC_L3_L4] < 0) { 2088 RTE_LOG(ERR, PMD, 2089 "Failed to load BPF section %s (%d): %s\n", 2090 sec_name[SEC_L3_L4], errno, strerror(errno)); 2091 rte_flow_error_set( 2092 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2093 "Kernel too old or not configured " 2094 "to support BPF program loading"); 2095 2096 return -ENOTSUP; 2097 } 2098 2099 /* Actions */ 2100 { 2101 struct action_data adata[] = { 2102 { 2103 .id = "bpf", 2104 .bpf = { 2105 .bpf_fd = flow->bpf_fd[SEC_L3_L4], 2106 .annotation = sec_name[SEC_L3_L4], 2107 .bpf = { 2108 .action = TC_ACT_PIPE, 2109 }, 2110 }, 2111 }, 2112 }; 2113 2114 if (add_actions(flow, RTE_DIM(adata), adata, 2115 TCA_FLOWER_ACT) < 0) 2116 return -1; 2117 } 2118 2119 return 0; 2120 } 2121 2122 /** 2123 * Manage filter operations. 2124 * 2125 * @param dev 2126 * Pointer to Ethernet device structure. 2127 * @param filter_type 2128 * Filter type. 2129 * @param filter_op 2130 * Operation to perform. 2131 * @param arg 2132 * Pointer to operation-specific structure. 2133 * 2134 * @return 2135 * 0 on success, negative errno value on failure. 2136 */ 2137 int 2138 tap_dev_filter_ctrl(struct rte_eth_dev *dev, 2139 enum rte_filter_type filter_type, 2140 enum rte_filter_op filter_op, 2141 void *arg) 2142 { 2143 switch (filter_type) { 2144 case RTE_ETH_FILTER_GENERIC: 2145 if (filter_op != RTE_ETH_FILTER_GET) 2146 return -EINVAL; 2147 *(const void **)arg = &tap_flow_ops; 2148 return 0; 2149 default: 2150 RTE_LOG(ERR, PMD, "%p: filter type (%d) not supported\n", 2151 (void *)dev, filter_type); 2152 } 2153 return -EINVAL; 2154 } 2155 2156