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 /* DEI matching is not supported */ 274 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN 275 .tci = 0xffef, 276 #else 277 .tci = 0xefff, 278 #endif 279 .inner_type = -1, 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 (!rte_is_zero_ether_addr(&mask->dst)) { 541 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_DST, 542 RTE_ETHER_ADDR_LEN, 543 &spec->dst.addr_bytes); 544 tap_nlattr_add(&msg->nh, 545 TCA_FLOWER_KEY_ETH_DST_MASK, RTE_ETHER_ADDR_LEN, 546 &mask->dst.addr_bytes); 547 } 548 if (!rte_is_zero_ether_addr(&mask->src)) { 549 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_SRC, 550 RTE_ETHER_ADDR_LEN, 551 &spec->src.addr_bytes); 552 tap_nlattr_add(&msg->nh, 553 TCA_FLOWER_KEY_ETH_SRC_MASK, RTE_ETHER_ADDR_LEN, 554 &mask->src.addr_bytes); 555 } 556 return 0; 557 } 558 559 /** 560 * Make as much checks as possible on a VLAN item, and if a flow is provided, 561 * fill it appropriately with VLAN info. 562 * 563 * @param[in] item 564 * Item specification. 565 * @param[in, out] data 566 * Additional data structure to tell next layers we've been here. 567 * 568 * @return 569 * 0 if checks are alright, -1 otherwise. 570 */ 571 static int 572 tap_flow_create_vlan(const struct rte_flow_item *item, void *data) 573 { 574 struct convert_data *info = (struct convert_data *)data; 575 const struct rte_flow_item_vlan *spec = item->spec; 576 const struct rte_flow_item_vlan *mask = item->mask; 577 struct rte_flow *flow = info->flow; 578 struct nlmsg *msg; 579 580 /* use default mask if none provided */ 581 if (!mask) 582 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_VLAN].default_mask; 583 /* Outer TPID cannot be matched. */ 584 if (info->eth_type) 585 return -1; 586 /* Double-tagging not supported. */ 587 if (info->vlan) 588 return -1; 589 info->vlan = 1; 590 if (mask->inner_type) { 591 /* TC does not support partial eth_type masking */ 592 if (mask->inner_type != RTE_BE16(0xffff)) 593 return -1; 594 info->eth_type = spec->inner_type; 595 } 596 if (!flow) 597 return 0; 598 msg = &flow->msg; 599 msg->t.tcm_info = TC_H_MAKE(msg->t.tcm_info, htons(ETH_P_8021Q)); 600 #define VLAN_PRIO(tci) ((tci) >> 13) 601 #define VLAN_ID(tci) ((tci) & 0xfff) 602 if (!spec) 603 return 0; 604 if (spec->tci) { 605 uint16_t tci = ntohs(spec->tci) & mask->tci; 606 uint16_t prio = VLAN_PRIO(tci); 607 uint8_t vid = VLAN_ID(tci); 608 609 if (prio) 610 tap_nlattr_add8(&msg->nh, 611 TCA_FLOWER_KEY_VLAN_PRIO, prio); 612 if (vid) 613 tap_nlattr_add16(&msg->nh, 614 TCA_FLOWER_KEY_VLAN_ID, vid); 615 } 616 return 0; 617 } 618 619 /** 620 * Make as much checks as possible on an IPv4 item, and if a flow is provided, 621 * fill it appropriately with IPv4 info. 622 * 623 * @param[in] item 624 * Item specification. 625 * @param[in, out] data 626 * Additional data structure to tell next layers we've been here. 627 * 628 * @return 629 * 0 if checks are alright, -1 otherwise. 630 */ 631 static int 632 tap_flow_create_ipv4(const struct rte_flow_item *item, void *data) 633 { 634 struct convert_data *info = (struct convert_data *)data; 635 const struct rte_flow_item_ipv4 *spec = item->spec; 636 const struct rte_flow_item_ipv4 *mask = item->mask; 637 struct rte_flow *flow = info->flow; 638 struct nlmsg *msg; 639 640 /* use default mask if none provided */ 641 if (!mask) 642 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_IPV4].default_mask; 643 /* check that previous eth type is compatible with ipv4 */ 644 if (info->eth_type && info->eth_type != htons(ETH_P_IP)) 645 return -1; 646 /* store ip_proto for consistency if udp/tcp pattern item comes next */ 647 if (spec) 648 info->ip_proto = spec->hdr.next_proto_id; 649 if (!flow) 650 return 0; 651 msg = &flow->msg; 652 if (!info->eth_type) 653 info->eth_type = htons(ETH_P_IP); 654 if (!spec) 655 return 0; 656 if (mask->hdr.dst_addr) { 657 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST, 658 spec->hdr.dst_addr); 659 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST_MASK, 660 mask->hdr.dst_addr); 661 } 662 if (mask->hdr.src_addr) { 663 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC, 664 spec->hdr.src_addr); 665 tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC_MASK, 666 mask->hdr.src_addr); 667 } 668 if (spec->hdr.next_proto_id) 669 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, 670 spec->hdr.next_proto_id); 671 return 0; 672 } 673 674 /** 675 * Make as much checks as possible on an IPv6 item, and if a flow is provided, 676 * fill it appropriately with IPv6 info. 677 * 678 * @param[in] item 679 * Item specification. 680 * @param[in, out] data 681 * Additional data structure to tell next layers we've been here. 682 * 683 * @return 684 * 0 if checks are alright, -1 otherwise. 685 */ 686 static int 687 tap_flow_create_ipv6(const struct rte_flow_item *item, void *data) 688 { 689 struct convert_data *info = (struct convert_data *)data; 690 const struct rte_flow_item_ipv6 *spec = item->spec; 691 const struct rte_flow_item_ipv6 *mask = item->mask; 692 struct rte_flow *flow = info->flow; 693 uint8_t empty_addr[16] = { 0 }; 694 struct nlmsg *msg; 695 696 /* use default mask if none provided */ 697 if (!mask) 698 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_IPV6].default_mask; 699 /* check that previous eth type is compatible with ipv6 */ 700 if (info->eth_type && info->eth_type != htons(ETH_P_IPV6)) 701 return -1; 702 /* store ip_proto for consistency if udp/tcp pattern item comes next */ 703 if (spec) 704 info->ip_proto = spec->hdr.proto; 705 if (!flow) 706 return 0; 707 msg = &flow->msg; 708 if (!info->eth_type) 709 info->eth_type = htons(ETH_P_IPV6); 710 if (!spec) 711 return 0; 712 if (memcmp(mask->hdr.dst_addr, empty_addr, 16)) { 713 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST, 714 sizeof(spec->hdr.dst_addr), &spec->hdr.dst_addr); 715 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST_MASK, 716 sizeof(mask->hdr.dst_addr), &mask->hdr.dst_addr); 717 } 718 if (memcmp(mask->hdr.src_addr, empty_addr, 16)) { 719 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC, 720 sizeof(spec->hdr.src_addr), &spec->hdr.src_addr); 721 tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC_MASK, 722 sizeof(mask->hdr.src_addr), &mask->hdr.src_addr); 723 } 724 if (spec->hdr.proto) 725 tap_nlattr_add8(&msg->nh, 726 TCA_FLOWER_KEY_IP_PROTO, spec->hdr.proto); 727 return 0; 728 } 729 730 /** 731 * Make as much checks as possible on a UDP item, and if a flow is provided, 732 * fill it appropriately with UDP info. 733 * 734 * @param[in] item 735 * Item specification. 736 * @param[in, out] data 737 * Additional data structure to tell next layers we've been here. 738 * 739 * @return 740 * 0 if checks are alright, -1 otherwise. 741 */ 742 static int 743 tap_flow_create_udp(const struct rte_flow_item *item, void *data) 744 { 745 struct convert_data *info = (struct convert_data *)data; 746 const struct rte_flow_item_udp *spec = item->spec; 747 const struct rte_flow_item_udp *mask = item->mask; 748 struct rte_flow *flow = info->flow; 749 struct nlmsg *msg; 750 751 /* use default mask if none provided */ 752 if (!mask) 753 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_UDP].default_mask; 754 /* check that previous ip_proto is compatible with udp */ 755 if (info->ip_proto && info->ip_proto != IPPROTO_UDP) 756 return -1; 757 /* TC does not support UDP port masking. Only accept if exact match. */ 758 if ((mask->hdr.src_port && mask->hdr.src_port != 0xffff) || 759 (mask->hdr.dst_port && mask->hdr.dst_port != 0xffff)) 760 return -1; 761 if (!flow) 762 return 0; 763 msg = &flow->msg; 764 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_UDP); 765 if (!spec) 766 return 0; 767 if (mask->hdr.dst_port) 768 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_DST, 769 spec->hdr.dst_port); 770 if (mask->hdr.src_port) 771 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_SRC, 772 spec->hdr.src_port); 773 return 0; 774 } 775 776 /** 777 * Make as much checks as possible on a TCP item, and if a flow is provided, 778 * fill it appropriately with TCP info. 779 * 780 * @param[in] item 781 * Item specification. 782 * @param[in, out] data 783 * Additional data structure to tell next layers we've been here. 784 * 785 * @return 786 * 0 if checks are alright, -1 otherwise. 787 */ 788 static int 789 tap_flow_create_tcp(const struct rte_flow_item *item, void *data) 790 { 791 struct convert_data *info = (struct convert_data *)data; 792 const struct rte_flow_item_tcp *spec = item->spec; 793 const struct rte_flow_item_tcp *mask = item->mask; 794 struct rte_flow *flow = info->flow; 795 struct nlmsg *msg; 796 797 /* use default mask if none provided */ 798 if (!mask) 799 mask = tap_flow_items[RTE_FLOW_ITEM_TYPE_TCP].default_mask; 800 /* check that previous ip_proto is compatible with tcp */ 801 if (info->ip_proto && info->ip_proto != IPPROTO_TCP) 802 return -1; 803 /* TC does not support TCP port masking. Only accept if exact match. */ 804 if ((mask->hdr.src_port && mask->hdr.src_port != 0xffff) || 805 (mask->hdr.dst_port && mask->hdr.dst_port != 0xffff)) 806 return -1; 807 if (!flow) 808 return 0; 809 msg = &flow->msg; 810 tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_TCP); 811 if (!spec) 812 return 0; 813 if (mask->hdr.dst_port) 814 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_DST, 815 spec->hdr.dst_port); 816 if (mask->hdr.src_port) 817 tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_SRC, 818 spec->hdr.src_port); 819 return 0; 820 } 821 822 /** 823 * Check support for a given item. 824 * 825 * @param[in] item 826 * Item specification. 827 * @param size 828 * Bit-Mask size in bytes. 829 * @param[in] supported_mask 830 * Bit-mask covering supported fields to compare with spec, last and mask in 831 * \item. 832 * @param[in] default_mask 833 * Bit-mask default mask if none is provided in \item. 834 * 835 * @return 836 * 0 on success. 837 */ 838 static int 839 tap_flow_item_validate(const struct rte_flow_item *item, 840 unsigned int size, 841 const uint8_t *supported_mask, 842 const uint8_t *default_mask) 843 { 844 int ret = 0; 845 846 /* An empty layer is allowed, as long as all fields are NULL */ 847 if (!item->spec && (item->mask || item->last)) 848 return -1; 849 /* Is the item spec compatible with what the NIC supports? */ 850 if (item->spec && !item->mask) { 851 unsigned int i; 852 const uint8_t *spec = item->spec; 853 854 for (i = 0; i < size; ++i) 855 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 856 return -1; 857 /* Is the default mask compatible with what the NIC supports? */ 858 for (i = 0; i < size; i++) 859 if ((default_mask[i] | supported_mask[i]) != 860 supported_mask[i]) 861 return -1; 862 } 863 /* Is the item last compatible with what the NIC supports? */ 864 if (item->last && !item->mask) { 865 unsigned int i; 866 const uint8_t *spec = item->last; 867 868 for (i = 0; i < size; ++i) 869 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 870 return -1; 871 } 872 /* Is the item mask compatible with what the NIC supports? */ 873 if (item->mask) { 874 unsigned int i; 875 const uint8_t *spec = item->mask; 876 877 for (i = 0; i < size; ++i) 878 if ((spec[i] | supported_mask[i]) != supported_mask[i]) 879 return -1; 880 } 881 /** 882 * Once masked, Are item spec and item last equal? 883 * TC does not support range so anything else is invalid. 884 */ 885 if (item->spec && item->last) { 886 uint8_t spec[size]; 887 uint8_t last[size]; 888 const uint8_t *apply = default_mask; 889 unsigned int i; 890 891 if (item->mask) 892 apply = item->mask; 893 for (i = 0; i < size; ++i) { 894 spec[i] = ((const uint8_t *)item->spec)[i] & apply[i]; 895 last[i] = ((const uint8_t *)item->last)[i] & apply[i]; 896 } 897 ret = memcmp(spec, last, size); 898 } 899 return ret; 900 } 901 902 /** 903 * Configure the kernel with a TC action and its configured parameters 904 * Handled actions: "gact", "mirred", "skbedit", "bpf" 905 * 906 * @param[in] flow 907 * Pointer to rte flow containing the netlink message 908 * 909 * @param[in, out] act_index 910 * Pointer to action sequence number in the TC command 911 * 912 * @param[in] adata 913 * Pointer to struct holding the action parameters 914 * 915 * @return 916 * -1 on failure, 0 on success 917 */ 918 static int 919 add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata) 920 { 921 struct nlmsg *msg = &flow->msg; 922 923 if (tap_nlattr_nested_start(msg, (*act_index)++) < 0) 924 return -1; 925 926 tap_nlattr_add(&msg->nh, TCA_ACT_KIND, 927 strlen(adata->id) + 1, adata->id); 928 if (tap_nlattr_nested_start(msg, TCA_ACT_OPTIONS) < 0) 929 return -1; 930 if (strcmp("gact", adata->id) == 0) { 931 tap_nlattr_add(&msg->nh, TCA_GACT_PARMS, sizeof(adata->gact), 932 &adata->gact); 933 } else if (strcmp("mirred", adata->id) == 0) { 934 if (adata->mirred.eaction == TCA_EGRESS_MIRROR) 935 adata->mirred.action = TC_ACT_PIPE; 936 else /* REDIRECT */ 937 adata->mirred.action = TC_ACT_STOLEN; 938 tap_nlattr_add(&msg->nh, TCA_MIRRED_PARMS, 939 sizeof(adata->mirred), 940 &adata->mirred); 941 } else if (strcmp("skbedit", adata->id) == 0) { 942 tap_nlattr_add(&msg->nh, TCA_SKBEDIT_PARMS, 943 sizeof(adata->skbedit.skbedit), 944 &adata->skbedit.skbedit); 945 tap_nlattr_add16(&msg->nh, TCA_SKBEDIT_QUEUE_MAPPING, 946 adata->skbedit.queue); 947 } else if (strcmp("bpf", adata->id) == 0) { 948 tap_nlattr_add32(&msg->nh, TCA_ACT_BPF_FD, adata->bpf.bpf_fd); 949 tap_nlattr_add(&msg->nh, TCA_ACT_BPF_NAME, 950 strlen(adata->bpf.annotation) + 1, 951 adata->bpf.annotation); 952 tap_nlattr_add(&msg->nh, TCA_ACT_BPF_PARMS, 953 sizeof(adata->bpf.bpf), 954 &adata->bpf.bpf); 955 } else { 956 return -1; 957 } 958 tap_nlattr_nested_finish(msg); /* nested TCA_ACT_OPTIONS */ 959 tap_nlattr_nested_finish(msg); /* nested act_index */ 960 return 0; 961 } 962 963 /** 964 * Helper function to send a serie of TC actions to the kernel 965 * 966 * @param[in] flow 967 * Pointer to rte flow containing the netlink message 968 * 969 * @param[in] nb_actions 970 * Number of actions in an array of action structs 971 * 972 * @param[in] data 973 * Pointer to an array of action structs 974 * 975 * @param[in] classifier_actions 976 * The classifier on behave of which the actions are configured 977 * 978 * @return 979 * -1 on failure, 0 on success 980 */ 981 static int 982 add_actions(struct rte_flow *flow, int nb_actions, struct action_data *data, 983 int classifier_action) 984 { 985 struct nlmsg *msg = &flow->msg; 986 size_t act_index = 1; 987 int i; 988 989 if (tap_nlattr_nested_start(msg, classifier_action) < 0) 990 return -1; 991 for (i = 0; i < nb_actions; i++) 992 if (add_action(flow, &act_index, data + i) < 0) 993 return -1; 994 tap_nlattr_nested_finish(msg); /* nested TCA_FLOWER_ACT */ 995 return 0; 996 } 997 998 /** 999 * Validate a flow supported by TC. 1000 * If flow param is not NULL, then also fill the netlink message inside. 1001 * 1002 * @param pmd 1003 * Pointer to private structure. 1004 * @param[in] attr 1005 * Flow rule attributes. 1006 * @param[in] pattern 1007 * Pattern specification (list terminated by the END pattern item). 1008 * @param[in] actions 1009 * Associated actions (list terminated by the END action). 1010 * @param[out] error 1011 * Perform verbose error reporting if not NULL. 1012 * @param[in, out] flow 1013 * Flow structure to update. 1014 * @param[in] mirred 1015 * If set to TCA_EGRESS_REDIR, provided actions will be replaced with a 1016 * redirection to the tap netdevice, and the TC rule will be configured 1017 * on the remote netdevice in pmd. 1018 * If set to TCA_EGRESS_MIRROR, provided actions will be replaced with a 1019 * mirroring to the tap netdevice, and the TC rule will be configured 1020 * on the remote netdevice in pmd. Matching packets will thus be duplicated. 1021 * If set to 0, the standard behavior is to be used: set correct actions for 1022 * the TC rule, and apply it on the tap netdevice. 1023 * 1024 * @return 1025 * 0 on success, a negative errno value otherwise and rte_errno is set. 1026 */ 1027 static int 1028 priv_flow_process(struct pmd_internals *pmd, 1029 const struct rte_flow_attr *attr, 1030 const struct rte_flow_item items[], 1031 const struct rte_flow_action actions[], 1032 struct rte_flow_error *error, 1033 struct rte_flow *flow, 1034 int mirred) 1035 { 1036 const struct tap_flow_items *cur_item = tap_flow_items; 1037 struct convert_data data = { 1038 .eth_type = 0, 1039 .ip_proto = 0, 1040 .flow = flow, 1041 }; 1042 int action = 0; /* Only one action authorized for now */ 1043 1044 if (attr->transfer) { 1045 rte_flow_error_set( 1046 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_TRANSFER, 1047 NULL, "transfer is not supported"); 1048 return -rte_errno; 1049 } 1050 if (attr->group > MAX_GROUP) { 1051 rte_flow_error_set( 1052 error, EINVAL, RTE_FLOW_ERROR_TYPE_ATTR_GROUP, 1053 NULL, "group value too big: cannot exceed 15"); 1054 return -rte_errno; 1055 } 1056 if (attr->priority > MAX_PRIORITY) { 1057 rte_flow_error_set( 1058 error, EINVAL, RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, 1059 NULL, "priority value too big"); 1060 return -rte_errno; 1061 } else if (flow) { 1062 uint16_t group = attr->group << GROUP_SHIFT; 1063 uint16_t prio = group | (attr->priority + 1064 RSS_PRIORITY_OFFSET + PRIORITY_OFFSET); 1065 flow->msg.t.tcm_info = TC_H_MAKE(prio << 16, 1066 flow->msg.t.tcm_info); 1067 } 1068 if (flow) { 1069 if (mirred) { 1070 /* 1071 * If attr->ingress, the rule applies on remote ingress 1072 * to match incoming packets 1073 * If attr->egress, the rule applies on tap ingress (as 1074 * seen from the kernel) to deal with packets going out 1075 * from the DPDK app. 1076 */ 1077 flow->msg.t.tcm_parent = TC_H_MAKE(TC_H_INGRESS, 0); 1078 } else { 1079 /* Standard rule on tap egress (kernel standpoint). */ 1080 flow->msg.t.tcm_parent = 1081 TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0); 1082 } 1083 /* use flower filter type */ 1084 tap_nlattr_add(&flow->msg.nh, TCA_KIND, sizeof("flower"), "flower"); 1085 if (tap_nlattr_nested_start(&flow->msg, TCA_OPTIONS) < 0) 1086 goto exit_item_not_supported; 1087 } 1088 for (; items->type != RTE_FLOW_ITEM_TYPE_END; ++items) { 1089 const struct tap_flow_items *token = NULL; 1090 unsigned int i; 1091 int err = 0; 1092 1093 if (items->type == RTE_FLOW_ITEM_TYPE_VOID) 1094 continue; 1095 for (i = 0; 1096 cur_item->items && 1097 cur_item->items[i] != RTE_FLOW_ITEM_TYPE_END; 1098 ++i) { 1099 if (cur_item->items[i] == items->type) { 1100 token = &tap_flow_items[items->type]; 1101 break; 1102 } 1103 } 1104 if (!token) 1105 goto exit_item_not_supported; 1106 cur_item = token; 1107 err = tap_flow_item_validate( 1108 items, cur_item->mask_sz, 1109 (const uint8_t *)cur_item->mask, 1110 (const uint8_t *)cur_item->default_mask); 1111 if (err) 1112 goto exit_item_not_supported; 1113 if (flow && cur_item->convert) { 1114 err = cur_item->convert(items, &data); 1115 if (err) 1116 goto exit_item_not_supported; 1117 } 1118 } 1119 if (flow) { 1120 if (data.vlan) { 1121 tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE, 1122 htons(ETH_P_8021Q)); 1123 tap_nlattr_add16(&flow->msg.nh, 1124 TCA_FLOWER_KEY_VLAN_ETH_TYPE, 1125 data.eth_type ? 1126 data.eth_type : htons(ETH_P_ALL)); 1127 } else if (data.eth_type) { 1128 tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE, 1129 data.eth_type); 1130 } 1131 } 1132 if (mirred && flow) { 1133 struct action_data adata = { 1134 .id = "mirred", 1135 .mirred = { 1136 .eaction = mirred, 1137 }, 1138 }; 1139 1140 /* 1141 * If attr->egress && mirred, then this is a special 1142 * case where the rule must be applied on the tap, to 1143 * redirect packets coming from the DPDK App, out 1144 * through the remote netdevice. 1145 */ 1146 adata.mirred.ifindex = attr->ingress ? pmd->if_index : 1147 pmd->remote_if_index; 1148 if (mirred == TCA_EGRESS_MIRROR) 1149 adata.mirred.action = TC_ACT_PIPE; 1150 else 1151 adata.mirred.action = TC_ACT_STOLEN; 1152 if (add_actions(flow, 1, &adata, TCA_FLOWER_ACT) < 0) 1153 goto exit_action_not_supported; 1154 else 1155 goto end; 1156 } 1157 actions: 1158 for (; actions->type != RTE_FLOW_ACTION_TYPE_END; ++actions) { 1159 int err = 0; 1160 1161 if (actions->type == RTE_FLOW_ACTION_TYPE_VOID) { 1162 continue; 1163 } else if (actions->type == RTE_FLOW_ACTION_TYPE_DROP) { 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 .action = TC_ACT_SHOT, 1172 }, 1173 }; 1174 1175 err = add_actions(flow, 1, &adata, 1176 TCA_FLOWER_ACT); 1177 } 1178 } else if (actions->type == RTE_FLOW_ACTION_TYPE_PASSTHRU) { 1179 if (action) 1180 goto exit_action_not_supported; 1181 action = 1; 1182 if (flow) { 1183 struct action_data adata = { 1184 .id = "gact", 1185 .gact = { 1186 /* continue */ 1187 .action = TC_ACT_UNSPEC, 1188 }, 1189 }; 1190 1191 err = add_actions(flow, 1, &adata, 1192 TCA_FLOWER_ACT); 1193 } 1194 } else if (actions->type == RTE_FLOW_ACTION_TYPE_QUEUE) { 1195 const struct rte_flow_action_queue *queue = 1196 (const struct rte_flow_action_queue *) 1197 actions->conf; 1198 1199 if (action) 1200 goto exit_action_not_supported; 1201 action = 1; 1202 if (!queue || 1203 (queue->index > pmd->dev->data->nb_rx_queues - 1)) 1204 goto exit_action_not_supported; 1205 if (flow) { 1206 struct action_data adata = { 1207 .id = "skbedit", 1208 .skbedit = { 1209 .skbedit = { 1210 .action = TC_ACT_PIPE, 1211 }, 1212 .queue = queue->index, 1213 }, 1214 }; 1215 1216 err = add_actions(flow, 1, &adata, 1217 TCA_FLOWER_ACT); 1218 } 1219 } else if (actions->type == RTE_FLOW_ACTION_TYPE_RSS) { 1220 const struct rte_flow_action_rss *rss = 1221 (const struct rte_flow_action_rss *) 1222 actions->conf; 1223 1224 if (action++) 1225 goto exit_action_not_supported; 1226 1227 if (!pmd->rss_enabled) { 1228 err = rss_enable(pmd, attr, error); 1229 if (err) 1230 goto exit_action_not_supported; 1231 } 1232 if (flow) 1233 err = rss_add_actions(flow, pmd, rss, error); 1234 } else { 1235 goto exit_action_not_supported; 1236 } 1237 if (err) 1238 goto exit_action_not_supported; 1239 } 1240 /* When fate is unknown, drop traffic. */ 1241 if (!action) { 1242 static const struct rte_flow_action drop[] = { 1243 { .type = RTE_FLOW_ACTION_TYPE_DROP, }, 1244 { .type = RTE_FLOW_ACTION_TYPE_END, }, 1245 }; 1246 1247 actions = drop; 1248 goto actions; 1249 } 1250 end: 1251 if (flow) 1252 tap_nlattr_nested_finish(&flow->msg); /* nested TCA_OPTIONS */ 1253 return 0; 1254 exit_item_not_supported: 1255 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, 1256 items, "item not supported"); 1257 return -rte_errno; 1258 exit_action_not_supported: 1259 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ACTION, 1260 actions, "action not supported"); 1261 return -rte_errno; 1262 } 1263 1264 1265 1266 /** 1267 * Validate a flow. 1268 * 1269 * @see rte_flow_validate() 1270 * @see rte_flow_ops 1271 */ 1272 static int 1273 tap_flow_validate(struct rte_eth_dev *dev, 1274 const struct rte_flow_attr *attr, 1275 const struct rte_flow_item items[], 1276 const struct rte_flow_action actions[], 1277 struct rte_flow_error *error) 1278 { 1279 struct pmd_internals *pmd = dev->data->dev_private; 1280 1281 return priv_flow_process(pmd, attr, items, actions, error, NULL, 0); 1282 } 1283 1284 /** 1285 * Set a unique handle in a flow. 1286 * 1287 * The kernel supports TC rules with equal priority, as long as they use the 1288 * same matching fields (e.g.: dst mac and ipv4) with different values (and 1289 * full mask to ensure no collision is possible). 1290 * In those rules, the handle (uint32_t) is the part that would identify 1291 * specifically each rule. 1292 * 1293 * On 32-bit architectures, the handle can simply be the flow's pointer address. 1294 * On 64-bit architectures, we rely on jhash(flow) to find a (sufficiently) 1295 * unique handle. 1296 * 1297 * @param[in, out] flow 1298 * The flow that needs its handle set. 1299 */ 1300 static void 1301 tap_flow_set_handle(struct rte_flow *flow) 1302 { 1303 uint32_t handle = 0; 1304 1305 if (sizeof(flow) > 4) 1306 handle = rte_jhash(&flow, sizeof(flow), 1); 1307 else 1308 handle = (uintptr_t)flow; 1309 /* must be at least 1 to avoid letting the kernel choose one for us */ 1310 if (!handle) 1311 handle = 1; 1312 flow->msg.t.tcm_handle = handle; 1313 } 1314 1315 /** 1316 * Free the flow opened file descriptors and allocated memory 1317 * 1318 * @param[in] flow 1319 * Pointer to the flow to free 1320 * 1321 */ 1322 static void 1323 tap_flow_free(struct pmd_internals *pmd, struct rte_flow *flow) 1324 { 1325 int i; 1326 1327 if (!flow) 1328 return; 1329 1330 if (pmd->rss_enabled) { 1331 /* Close flow BPF file descriptors */ 1332 for (i = 0; i < SEC_MAX; i++) 1333 if (flow->bpf_fd[i] != 0) { 1334 close(flow->bpf_fd[i]); 1335 flow->bpf_fd[i] = 0; 1336 } 1337 1338 /* Release the map key for this RSS rule */ 1339 bpf_rss_key(KEY_CMD_RELEASE, &flow->key_idx); 1340 flow->key_idx = 0; 1341 } 1342 1343 /* Free flow allocated memory */ 1344 rte_free(flow); 1345 } 1346 1347 /** 1348 * Create a flow. 1349 * 1350 * @see rte_flow_create() 1351 * @see rte_flow_ops 1352 */ 1353 static struct rte_flow * 1354 tap_flow_create(struct rte_eth_dev *dev, 1355 const struct rte_flow_attr *attr, 1356 const struct rte_flow_item items[], 1357 const struct rte_flow_action actions[], 1358 struct rte_flow_error *error) 1359 { 1360 struct pmd_internals *pmd = dev->data->dev_private; 1361 struct rte_flow *remote_flow = NULL; 1362 struct rte_flow *flow = NULL; 1363 struct nlmsg *msg = NULL; 1364 int err; 1365 1366 if (!pmd->if_index) { 1367 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1368 NULL, 1369 "can't create rule, ifindex not found"); 1370 goto fail; 1371 } 1372 /* 1373 * No rules configured through standard rte_flow should be set on the 1374 * priorities used by implicit rules. 1375 */ 1376 if ((attr->group == MAX_GROUP) && 1377 attr->priority > (MAX_PRIORITY - TAP_REMOTE_MAX_IDX)) { 1378 rte_flow_error_set( 1379 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, 1380 NULL, "priority value too big"); 1381 goto fail; 1382 } 1383 flow = rte_zmalloc(__func__, sizeof(struct rte_flow), 0); 1384 if (!flow) { 1385 rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1386 NULL, "cannot allocate memory for rte_flow"); 1387 goto fail; 1388 } 1389 msg = &flow->msg; 1390 tc_init_msg(msg, pmd->if_index, RTM_NEWTFILTER, 1391 NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1392 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1393 tap_flow_set_handle(flow); 1394 if (priv_flow_process(pmd, attr, items, actions, error, flow, 0)) 1395 goto fail; 1396 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1397 if (err < 0) { 1398 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1399 NULL, "couldn't send request to kernel"); 1400 goto fail; 1401 } 1402 err = tap_nl_recv_ack(pmd->nlsk_fd); 1403 if (err < 0) { 1404 TAP_LOG(ERR, 1405 "Kernel refused TC filter rule creation (%d): %s", 1406 errno, strerror(errno)); 1407 rte_flow_error_set(error, EEXIST, RTE_FLOW_ERROR_TYPE_HANDLE, 1408 NULL, 1409 "overlapping rules or Kernel too old for flower support"); 1410 goto fail; 1411 } 1412 LIST_INSERT_HEAD(&pmd->flows, flow, next); 1413 /** 1414 * If a remote device is configured, a TC rule with identical items for 1415 * matching must be set on that device, with a single action: redirect 1416 * to the local pmd->if_index. 1417 */ 1418 if (pmd->remote_if_index) { 1419 remote_flow = rte_zmalloc(__func__, sizeof(struct rte_flow), 0); 1420 if (!remote_flow) { 1421 rte_flow_error_set( 1422 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1423 "cannot allocate memory for rte_flow"); 1424 goto fail; 1425 } 1426 msg = &remote_flow->msg; 1427 /* set the rule if_index for the remote netdevice */ 1428 tc_init_msg( 1429 msg, pmd->remote_if_index, RTM_NEWTFILTER, 1430 NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1431 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1432 tap_flow_set_handle(remote_flow); 1433 if (priv_flow_process(pmd, attr, items, NULL, 1434 error, remote_flow, TCA_EGRESS_REDIR)) { 1435 rte_flow_error_set( 1436 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1437 NULL, "rte flow rule validation failed"); 1438 goto fail; 1439 } 1440 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1441 if (err < 0) { 1442 rte_flow_error_set( 1443 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1444 NULL, "Failure sending nl request"); 1445 goto fail; 1446 } 1447 err = tap_nl_recv_ack(pmd->nlsk_fd); 1448 if (err < 0) { 1449 TAP_LOG(ERR, 1450 "Kernel refused TC filter rule creation (%d): %s", 1451 errno, strerror(errno)); 1452 rte_flow_error_set( 1453 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1454 NULL, 1455 "overlapping rules or Kernel too old for flower support"); 1456 goto fail; 1457 } 1458 flow->remote_flow = remote_flow; 1459 } 1460 return flow; 1461 fail: 1462 if (remote_flow) 1463 rte_free(remote_flow); 1464 if (flow) 1465 tap_flow_free(pmd, flow); 1466 return NULL; 1467 } 1468 1469 /** 1470 * Destroy a flow using pointer to pmd_internal. 1471 * 1472 * @param[in, out] pmd 1473 * Pointer to private structure. 1474 * @param[in] flow 1475 * Pointer to the flow to destroy. 1476 * @param[in, out] error 1477 * Pointer to the flow error handler 1478 * 1479 * @return 0 if the flow could be destroyed, -1 otherwise. 1480 */ 1481 static int 1482 tap_flow_destroy_pmd(struct pmd_internals *pmd, 1483 struct rte_flow *flow, 1484 struct rte_flow_error *error) 1485 { 1486 struct rte_flow *remote_flow = flow->remote_flow; 1487 int ret = 0; 1488 1489 LIST_REMOVE(flow, next); 1490 flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; 1491 flow->msg.nh.nlmsg_type = RTM_DELTFILTER; 1492 1493 ret = tap_nl_send(pmd->nlsk_fd, &flow->msg.nh); 1494 if (ret < 0) { 1495 rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1496 NULL, "couldn't send request to kernel"); 1497 goto end; 1498 } 1499 ret = tap_nl_recv_ack(pmd->nlsk_fd); 1500 /* If errno is ENOENT, the rule is already no longer in the kernel. */ 1501 if (ret < 0 && errno == ENOENT) 1502 ret = 0; 1503 if (ret < 0) { 1504 TAP_LOG(ERR, 1505 "Kernel refused TC filter rule deletion (%d): %s", 1506 errno, strerror(errno)); 1507 rte_flow_error_set( 1508 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1509 "couldn't receive kernel ack to our request"); 1510 goto end; 1511 } 1512 1513 if (remote_flow) { 1514 remote_flow->msg.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; 1515 remote_flow->msg.nh.nlmsg_type = RTM_DELTFILTER; 1516 1517 ret = tap_nl_send(pmd->nlsk_fd, &remote_flow->msg.nh); 1518 if (ret < 0) { 1519 rte_flow_error_set( 1520 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1521 NULL, "Failure sending nl request"); 1522 goto end; 1523 } 1524 ret = tap_nl_recv_ack(pmd->nlsk_fd); 1525 if (ret < 0 && errno == ENOENT) 1526 ret = 0; 1527 if (ret < 0) { 1528 TAP_LOG(ERR, 1529 "Kernel refused TC filter rule deletion (%d): %s", 1530 errno, strerror(errno)); 1531 rte_flow_error_set( 1532 error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE, 1533 NULL, "Failure trying to receive nl ack"); 1534 goto end; 1535 } 1536 } 1537 end: 1538 if (remote_flow) 1539 rte_free(remote_flow); 1540 tap_flow_free(pmd, flow); 1541 return ret; 1542 } 1543 1544 /** 1545 * Destroy a flow. 1546 * 1547 * @see rte_flow_destroy() 1548 * @see rte_flow_ops 1549 */ 1550 static int 1551 tap_flow_destroy(struct rte_eth_dev *dev, 1552 struct rte_flow *flow, 1553 struct rte_flow_error *error) 1554 { 1555 struct pmd_internals *pmd = dev->data->dev_private; 1556 1557 return tap_flow_destroy_pmd(pmd, flow, error); 1558 } 1559 1560 /** 1561 * Enable/disable flow isolation. 1562 * 1563 * @see rte_flow_isolate() 1564 * @see rte_flow_ops 1565 */ 1566 static int 1567 tap_flow_isolate(struct rte_eth_dev *dev, 1568 int set, 1569 struct rte_flow_error *error __rte_unused) 1570 { 1571 struct pmd_internals *pmd = dev->data->dev_private; 1572 struct pmd_process_private *process_private = dev->process_private; 1573 1574 /* normalize 'set' variable to contain 0 or 1 values */ 1575 if (set) 1576 set = 1; 1577 /* if already in the right isolation mode - nothing to do */ 1578 if ((set ^ pmd->flow_isolate) == 0) 1579 return 0; 1580 /* mark the isolation mode for tap_flow_implicit_create() */ 1581 pmd->flow_isolate = set; 1582 /* 1583 * If netdevice is there, setup appropriate flow rules immediately. 1584 * Otherwise it will be set when bringing up the netdevice (tun_alloc). 1585 */ 1586 if (!process_private->rxq_fds[0]) 1587 return 0; 1588 if (set) { 1589 struct rte_flow *remote_flow; 1590 1591 while (1) { 1592 remote_flow = LIST_FIRST(&pmd->implicit_flows); 1593 if (!remote_flow) 1594 break; 1595 /* 1596 * Remove all implicit rules on the remote. 1597 * Keep the local rule to redirect packets on TX. 1598 * Keep also the last implicit local rule: ISOLATE. 1599 */ 1600 if (remote_flow->msg.t.tcm_ifindex == pmd->if_index) 1601 break; 1602 if (tap_flow_destroy_pmd(pmd, remote_flow, NULL) < 0) 1603 goto error; 1604 } 1605 /* Switch the TC rule according to pmd->flow_isolate */ 1606 if (tap_flow_implicit_create(pmd, TAP_ISOLATE) == -1) 1607 goto error; 1608 } else { 1609 /* Switch the TC rule according to pmd->flow_isolate */ 1610 if (tap_flow_implicit_create(pmd, TAP_ISOLATE) == -1) 1611 goto error; 1612 if (!pmd->remote_if_index) 1613 return 0; 1614 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0) 1615 goto error; 1616 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0) 1617 goto error; 1618 if (tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0) 1619 goto error; 1620 if (tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) 1621 goto error; 1622 if (dev->data->promiscuous && 1623 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC) < 0) 1624 goto error; 1625 if (dev->data->all_multicast && 1626 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI) < 0) 1627 goto error; 1628 } 1629 return 0; 1630 error: 1631 pmd->flow_isolate = 0; 1632 return rte_flow_error_set( 1633 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, 1634 "TC rule creation failed"); 1635 } 1636 1637 /** 1638 * Destroy all flows. 1639 * 1640 * @see rte_flow_flush() 1641 * @see rte_flow_ops 1642 */ 1643 int 1644 tap_flow_flush(struct rte_eth_dev *dev, struct rte_flow_error *error) 1645 { 1646 struct pmd_internals *pmd = dev->data->dev_private; 1647 struct rte_flow *flow; 1648 1649 while (!LIST_EMPTY(&pmd->flows)) { 1650 flow = LIST_FIRST(&pmd->flows); 1651 if (tap_flow_destroy(dev, flow, error) < 0) 1652 return -1; 1653 } 1654 return 0; 1655 } 1656 1657 /** 1658 * Add an implicit flow rule on the remote device to make sure traffic gets to 1659 * the tap netdevice from there. 1660 * 1661 * @param pmd 1662 * Pointer to private structure. 1663 * @param[in] idx 1664 * The idx in the implicit_rte_flows array specifying which rule to apply. 1665 * 1666 * @return -1 if the rule couldn't be applied, 0 otherwise. 1667 */ 1668 int tap_flow_implicit_create(struct pmd_internals *pmd, 1669 enum implicit_rule_index idx) 1670 { 1671 uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE; 1672 struct rte_flow_action *actions = implicit_rte_flows[idx].actions; 1673 struct rte_flow_action isolate_actions[2] = { 1674 [1] = { 1675 .type = RTE_FLOW_ACTION_TYPE_END, 1676 }, 1677 }; 1678 struct rte_flow_item *items = implicit_rte_flows[idx].items; 1679 struct rte_flow_attr *attr = &implicit_rte_flows[idx].attr; 1680 struct rte_flow_item_eth eth_local = { .type = 0 }; 1681 uint16_t if_index = pmd->remote_if_index; 1682 struct rte_flow *remote_flow = NULL; 1683 struct nlmsg *msg = NULL; 1684 int err = 0; 1685 struct rte_flow_item items_local[2] = { 1686 [0] = { 1687 .type = items[0].type, 1688 .spec = ð_local, 1689 .mask = items[0].mask, 1690 }, 1691 [1] = { 1692 .type = items[1].type, 1693 } 1694 }; 1695 1696 remote_flow = rte_zmalloc(__func__, sizeof(struct rte_flow), 0); 1697 if (!remote_flow) { 1698 TAP_LOG(ERR, "Cannot allocate memory for rte_flow"); 1699 goto fail; 1700 } 1701 msg = &remote_flow->msg; 1702 if (idx == TAP_REMOTE_TX) { 1703 if_index = pmd->if_index; 1704 } else if (idx == TAP_ISOLATE) { 1705 if_index = pmd->if_index; 1706 /* Don't be exclusive for this rule, it can be changed later. */ 1707 flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE; 1708 isolate_actions[0].type = pmd->flow_isolate ? 1709 RTE_FLOW_ACTION_TYPE_DROP : 1710 RTE_FLOW_ACTION_TYPE_PASSTHRU; 1711 actions = isolate_actions; 1712 } else if (idx == TAP_REMOTE_LOCAL_MAC) { 1713 /* 1714 * eth addr couldn't be set in implicit_rte_flows[] as it is not 1715 * known at compile time. 1716 */ 1717 memcpy(ð_local.dst, &pmd->eth_addr, sizeof(pmd->eth_addr)); 1718 items = items_local; 1719 } 1720 tc_init_msg(msg, if_index, RTM_NEWTFILTER, flags); 1721 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1722 /* 1723 * The ISOLATE rule is always present and must have a static handle, as 1724 * the action is changed whether the feature is enabled (DROP) or 1725 * disabled (PASSTHRU). 1726 * There is just one REMOTE_PROMISCUOUS rule in all cases. It should 1727 * have a static handle such that adding it twice will fail with EEXIST 1728 * with any kernel version. Remark: old kernels may falsely accept the 1729 * same REMOTE_PROMISCUOUS rules if they had different handles. 1730 */ 1731 if (idx == TAP_ISOLATE) 1732 remote_flow->msg.t.tcm_handle = ISOLATE_HANDLE; 1733 else if (idx == TAP_REMOTE_PROMISC) 1734 remote_flow->msg.t.tcm_handle = REMOTE_PROMISCUOUS_HANDLE; 1735 else 1736 tap_flow_set_handle(remote_flow); 1737 if (priv_flow_process(pmd, attr, items, actions, NULL, 1738 remote_flow, implicit_rte_flows[idx].mirred)) { 1739 TAP_LOG(ERR, "rte flow rule validation failed"); 1740 goto fail; 1741 } 1742 err = tap_nl_send(pmd->nlsk_fd, &msg->nh); 1743 if (err < 0) { 1744 TAP_LOG(ERR, "Failure sending nl request"); 1745 goto fail; 1746 } 1747 err = tap_nl_recv_ack(pmd->nlsk_fd); 1748 if (err < 0) { 1749 /* Silently ignore re-entering existing rule */ 1750 if (errno == EEXIST) 1751 goto success; 1752 TAP_LOG(ERR, 1753 "Kernel refused TC filter rule creation (%d): %s", 1754 errno, strerror(errno)); 1755 goto fail; 1756 } 1757 LIST_INSERT_HEAD(&pmd->implicit_flows, remote_flow, next); 1758 success: 1759 return 0; 1760 fail: 1761 if (remote_flow) 1762 rte_free(remote_flow); 1763 return -1; 1764 } 1765 1766 /** 1767 * Remove specific implicit flow rule on the remote device. 1768 * 1769 * @param[in, out] pmd 1770 * Pointer to private structure. 1771 * @param[in] idx 1772 * The idx in the implicit_rte_flows array specifying which rule to remove. 1773 * 1774 * @return -1 if one of the implicit rules couldn't be created, 0 otherwise. 1775 */ 1776 int tap_flow_implicit_destroy(struct pmd_internals *pmd, 1777 enum implicit_rule_index idx) 1778 { 1779 struct rte_flow *remote_flow; 1780 int cur_prio = -1; 1781 int idx_prio = implicit_rte_flows[idx].attr.priority + PRIORITY_OFFSET; 1782 1783 for (remote_flow = LIST_FIRST(&pmd->implicit_flows); 1784 remote_flow; 1785 remote_flow = LIST_NEXT(remote_flow, next)) { 1786 cur_prio = (remote_flow->msg.t.tcm_info >> 16) & PRIORITY_MASK; 1787 if (cur_prio != idx_prio) 1788 continue; 1789 return tap_flow_destroy_pmd(pmd, remote_flow, NULL); 1790 } 1791 return 0; 1792 } 1793 1794 /** 1795 * Destroy all implicit flows. 1796 * 1797 * @see rte_flow_flush() 1798 */ 1799 int 1800 tap_flow_implicit_flush(struct pmd_internals *pmd, struct rte_flow_error *error) 1801 { 1802 struct rte_flow *remote_flow; 1803 1804 while (!LIST_EMPTY(&pmd->implicit_flows)) { 1805 remote_flow = LIST_FIRST(&pmd->implicit_flows); 1806 if (tap_flow_destroy_pmd(pmd, remote_flow, error) < 0) 1807 return -1; 1808 } 1809 return 0; 1810 } 1811 1812 #define MAX_RSS_KEYS 256 1813 #define KEY_IDX_OFFSET (3 * MAX_RSS_KEYS) 1814 #define SEC_NAME_CLS_Q "cls_q" 1815 1816 static const char *sec_name[SEC_MAX] = { 1817 [SEC_L3_L4] = "l3_l4", 1818 }; 1819 1820 /** 1821 * Enable RSS on tap: create TC rules for queuing. 1822 * 1823 * @param[in, out] pmd 1824 * Pointer to private structure. 1825 * 1826 * @param[in] attr 1827 * Pointer to rte_flow to get flow group 1828 * 1829 * @param[out] error 1830 * Pointer to error reporting if not NULL. 1831 * 1832 * @return 0 on success, negative value on failure. 1833 */ 1834 static int rss_enable(struct pmd_internals *pmd, 1835 const struct rte_flow_attr *attr, 1836 struct rte_flow_error *error) 1837 { 1838 struct rte_flow *rss_flow = NULL; 1839 struct nlmsg *msg = NULL; 1840 /* 4096 is the maximum number of instructions for a BPF program */ 1841 char annotation[64]; 1842 int i; 1843 int err = 0; 1844 1845 /* unlimit locked memory */ 1846 struct rlimit memlock_limit = { 1847 .rlim_cur = RLIM_INFINITY, 1848 .rlim_max = RLIM_INFINITY, 1849 }; 1850 setrlimit(RLIMIT_MEMLOCK, &memlock_limit); 1851 1852 /* Get a new map key for a new RSS rule */ 1853 err = bpf_rss_key(KEY_CMD_INIT, NULL); 1854 if (err < 0) { 1855 rte_flow_error_set( 1856 error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1857 "Failed to initialize BPF RSS keys"); 1858 1859 return -1; 1860 } 1861 1862 /* 1863 * Create BPF RSS MAP 1864 */ 1865 pmd->map_fd = tap_flow_bpf_rss_map_create(sizeof(__u32), /* key size */ 1866 sizeof(struct rss_key), 1867 MAX_RSS_KEYS); 1868 if (pmd->map_fd < 0) { 1869 TAP_LOG(ERR, 1870 "Failed to create BPF map (%d): %s", 1871 errno, strerror(errno)); 1872 rte_flow_error_set( 1873 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 1874 "Kernel too old or not configured " 1875 "to support BPF maps"); 1876 1877 return -ENOTSUP; 1878 } 1879 1880 /* 1881 * Add a rule per queue to match reclassified packets and direct them to 1882 * the correct queue. 1883 */ 1884 for (i = 0; i < pmd->dev->data->nb_rx_queues; i++) { 1885 pmd->bpf_fd[i] = tap_flow_bpf_cls_q(i); 1886 if (pmd->bpf_fd[i] < 0) { 1887 TAP_LOG(ERR, 1888 "Failed to load BPF section %s for queue %d", 1889 SEC_NAME_CLS_Q, i); 1890 rte_flow_error_set( 1891 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, 1892 NULL, 1893 "Kernel too old or not configured " 1894 "to support BPF programs loading"); 1895 1896 return -ENOTSUP; 1897 } 1898 1899 rss_flow = rte_zmalloc(__func__, sizeof(struct rte_flow), 0); 1900 if (!rss_flow) { 1901 TAP_LOG(ERR, 1902 "Cannot allocate memory for rte_flow"); 1903 return -1; 1904 } 1905 msg = &rss_flow->msg; 1906 tc_init_msg(msg, pmd->if_index, RTM_NEWTFILTER, NLM_F_REQUEST | 1907 NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); 1908 msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); 1909 tap_flow_set_handle(rss_flow); 1910 uint16_t group = attr->group << GROUP_SHIFT; 1911 uint16_t prio = group | (i + PRIORITY_OFFSET); 1912 msg->t.tcm_info = TC_H_MAKE(prio << 16, msg->t.tcm_info); 1913 msg->t.tcm_parent = TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0); 1914 1915 tap_nlattr_add(&msg->nh, TCA_KIND, sizeof("bpf"), "bpf"); 1916 if (tap_nlattr_nested_start(msg, TCA_OPTIONS) < 0) 1917 return -1; 1918 tap_nlattr_add32(&msg->nh, TCA_BPF_FD, pmd->bpf_fd[i]); 1919 snprintf(annotation, sizeof(annotation), "[%s%d]", 1920 SEC_NAME_CLS_Q, i); 1921 tap_nlattr_add(&msg->nh, TCA_BPF_NAME, strlen(annotation) + 1, 1922 annotation); 1923 /* Actions */ 1924 { 1925 struct action_data adata = { 1926 .id = "skbedit", 1927 .skbedit = { 1928 .skbedit = { 1929 .action = TC_ACT_PIPE, 1930 }, 1931 .queue = i, 1932 }, 1933 }; 1934 if (add_actions(rss_flow, 1, &adata, TCA_BPF_ACT) < 0) 1935 return -1; 1936 } 1937 tap_nlattr_nested_finish(msg); /* nested TCA_OPTIONS */ 1938 1939 /* Netlink message is now ready to be sent */ 1940 if (tap_nl_send(pmd->nlsk_fd, &msg->nh) < 0) 1941 return -1; 1942 err = tap_nl_recv_ack(pmd->nlsk_fd); 1943 if (err < 0) { 1944 TAP_LOG(ERR, 1945 "Kernel refused TC filter rule creation (%d): %s", 1946 errno, strerror(errno)); 1947 return err; 1948 } 1949 LIST_INSERT_HEAD(&pmd->rss_flows, rss_flow, next); 1950 } 1951 1952 pmd->rss_enabled = 1; 1953 return err; 1954 } 1955 1956 /** 1957 * Manage bpf RSS keys repository with operations: init, get, release 1958 * 1959 * @param[in] cmd 1960 * Command on RSS keys: init, get, release 1961 * 1962 * @param[in, out] key_idx 1963 * Pointer to RSS Key index (out for get command, in for release command) 1964 * 1965 * @return -1 if couldn't get, release or init the RSS keys, 0 otherwise. 1966 */ 1967 static int bpf_rss_key(enum bpf_rss_key_e cmd, __u32 *key_idx) 1968 { 1969 __u32 i; 1970 int err = 0; 1971 static __u32 num_used_keys; 1972 static __u32 rss_keys[MAX_RSS_KEYS] = {KEY_STAT_UNSPEC}; 1973 static __u32 rss_keys_initialized; 1974 __u32 key; 1975 1976 switch (cmd) { 1977 case KEY_CMD_GET: 1978 if (!rss_keys_initialized) { 1979 err = -1; 1980 break; 1981 } 1982 1983 if (num_used_keys == RTE_DIM(rss_keys)) { 1984 err = -1; 1985 break; 1986 } 1987 1988 *key_idx = num_used_keys % RTE_DIM(rss_keys); 1989 while (rss_keys[*key_idx] == KEY_STAT_USED) 1990 *key_idx = (*key_idx + 1) % RTE_DIM(rss_keys); 1991 1992 rss_keys[*key_idx] = KEY_STAT_USED; 1993 1994 /* 1995 * Add an offset to key_idx in order to handle a case of 1996 * RSS and non RSS flows mixture. 1997 * If a non RSS flow is destroyed it has an eBPF map 1998 * index 0 (initialized on flow creation) and might 1999 * unintentionally remove RSS entry 0 from eBPF map. 2000 * To avoid this issue, add an offset to the real index 2001 * during a KEY_CMD_GET operation and subtract this offset 2002 * during a KEY_CMD_RELEASE operation in order to restore 2003 * the real index. 2004 */ 2005 *key_idx += KEY_IDX_OFFSET; 2006 num_used_keys++; 2007 break; 2008 2009 case KEY_CMD_RELEASE: 2010 if (!rss_keys_initialized) 2011 break; 2012 2013 /* 2014 * Subtract offest to restore real key index 2015 * If a non RSS flow is falsely trying to release map 2016 * entry 0 - the offset subtraction will calculate the real 2017 * map index as an out-of-range value and the release operation 2018 * will be silently ignored. 2019 */ 2020 key = *key_idx - KEY_IDX_OFFSET; 2021 if (key >= RTE_DIM(rss_keys)) 2022 break; 2023 2024 if (rss_keys[key] == KEY_STAT_USED) { 2025 rss_keys[key] = KEY_STAT_AVAILABLE; 2026 num_used_keys--; 2027 } 2028 break; 2029 2030 case KEY_CMD_INIT: 2031 for (i = 0; i < RTE_DIM(rss_keys); i++) 2032 rss_keys[i] = KEY_STAT_AVAILABLE; 2033 2034 rss_keys_initialized = 1; 2035 num_used_keys = 0; 2036 break; 2037 2038 case KEY_CMD_DEINIT: 2039 for (i = 0; i < RTE_DIM(rss_keys); i++) 2040 rss_keys[i] = KEY_STAT_UNSPEC; 2041 2042 rss_keys_initialized = 0; 2043 num_used_keys = 0; 2044 break; 2045 2046 default: 2047 break; 2048 } 2049 2050 return err; 2051 } 2052 2053 /** 2054 * Add RSS hash calculations and queue selection 2055 * 2056 * @param[in, out] pmd 2057 * Pointer to internal structure. Used to set/get RSS map fd 2058 * 2059 * @param[in] rss 2060 * Pointer to RSS flow actions 2061 * 2062 * @param[out] error 2063 * Pointer to error reporting if not NULL. 2064 * 2065 * @return 0 on success, negative value on failure 2066 */ 2067 static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, 2068 const struct rte_flow_action_rss *rss, 2069 struct rte_flow_error *error) 2070 { 2071 /* 4096 is the maximum number of instructions for a BPF program */ 2072 unsigned int i; 2073 int err; 2074 struct rss_key rss_entry = { .hash_fields = 0, 2075 .key_size = 0 }; 2076 2077 /* Check supported RSS features */ 2078 if (rss->func != RTE_ETH_HASH_FUNCTION_DEFAULT) 2079 return rte_flow_error_set 2080 (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, 2081 "non-default RSS hash functions are not supported"); 2082 if (rss->level) 2083 return rte_flow_error_set 2084 (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, 2085 "a nonzero RSS encapsulation level is not supported"); 2086 2087 /* Get a new map key for a new RSS rule */ 2088 err = bpf_rss_key(KEY_CMD_GET, &flow->key_idx); 2089 if (err < 0) { 2090 rte_flow_error_set( 2091 error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2092 "Failed to get BPF RSS key"); 2093 2094 return -1; 2095 } 2096 2097 /* Update RSS map entry with queues */ 2098 rss_entry.nb_queues = rss->queue_num; 2099 for (i = 0; i < rss->queue_num; i++) 2100 rss_entry.queues[i] = rss->queue[i]; 2101 rss_entry.hash_fields = 2102 (1 << HASH_FIELD_IPV4_L3_L4) | (1 << HASH_FIELD_IPV6_L3_L4); 2103 2104 /* Add this RSS entry to map */ 2105 err = tap_flow_bpf_update_rss_elem(pmd->map_fd, 2106 &flow->key_idx, &rss_entry); 2107 2108 if (err) { 2109 TAP_LOG(ERR, 2110 "Failed to update BPF map entry #%u (%d): %s", 2111 flow->key_idx, errno, strerror(errno)); 2112 rte_flow_error_set( 2113 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2114 "Kernel too old or not configured " 2115 "to support BPF maps updates"); 2116 2117 return -ENOTSUP; 2118 } 2119 2120 2121 /* 2122 * Load bpf rules to calculate hash for this key_idx 2123 */ 2124 2125 flow->bpf_fd[SEC_L3_L4] = 2126 tap_flow_bpf_calc_l3_l4_hash(flow->key_idx, pmd->map_fd); 2127 if (flow->bpf_fd[SEC_L3_L4] < 0) { 2128 TAP_LOG(ERR, 2129 "Failed to load BPF section %s (%d): %s", 2130 sec_name[SEC_L3_L4], errno, strerror(errno)); 2131 rte_flow_error_set( 2132 error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, 2133 "Kernel too old or not configured " 2134 "to support BPF program loading"); 2135 2136 return -ENOTSUP; 2137 } 2138 2139 /* Actions */ 2140 { 2141 struct action_data adata[] = { 2142 { 2143 .id = "bpf", 2144 .bpf = { 2145 .bpf_fd = flow->bpf_fd[SEC_L3_L4], 2146 .annotation = sec_name[SEC_L3_L4], 2147 .bpf = { 2148 .action = TC_ACT_PIPE, 2149 }, 2150 }, 2151 }, 2152 }; 2153 2154 if (add_actions(flow, RTE_DIM(adata), adata, 2155 TCA_FLOWER_ACT) < 0) 2156 return -1; 2157 } 2158 2159 return 0; 2160 } 2161 2162 /** 2163 * Get rte_flow operations. 2164 * 2165 * @param dev 2166 * Pointer to Ethernet device structure. 2167 * @param ops 2168 * Pointer to operation-specific structure. 2169 * 2170 * @return 2171 * 0 on success, negative errno value on failure. 2172 */ 2173 int 2174 tap_dev_flow_ops_get(struct rte_eth_dev *dev __rte_unused, 2175 const struct rte_flow_ops **ops) 2176 { 2177 *ops = &tap_flow_ops; 2178 return 0; 2179 } 2180