drivers/net/mlx4/mlx4_flow.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2017 6WIND S.A.
   3  * Copyright 2017 Mellanox Technologies, Ltd
   4  */
   5
   6 /**
   7  * @file
   8  * Flow API operations for mlx4 driver.
   9  */
  10
  11 #include <arpa/inet.h>
  12 #include <errno.h>
  13 #include <stdalign.h>
  14 #include <stddef.h>
  15 #include <stdint.h>
  16 #include <string.h>
  17 #include <sys/queue.h>
  18
  19 /* Verbs headers do not support -pedantic. */
  20 #ifdef PEDANTIC
  21 #pragma GCC diagnostic ignored "-Wpedantic"
  22 #endif
  23 #include <infiniband/verbs.h>
  24 #ifdef PEDANTIC
  25 #pragma GCC diagnostic error "-Wpedantic"
  26 #endif
  27
  28 #include <rte_byteorder.h>
  29 #include <rte_errno.h>
  30 #include <ethdev_driver.h>
  31 #include <rte_ether.h>
  32 #include <rte_flow.h>
  33 #include <rte_flow_driver.h>
  34 #include <rte_malloc.h>
  35
  36 /* PMD headers. */
  37 #include "mlx4.h"
  38 #include "mlx4_glue.h"
  39 #include "mlx4_flow.h"
  40 #include "mlx4_rxtx.h"
  41 #include "mlx4_utils.h"
  42
  43 /** Static initializer for a list of subsequent item types. */
  44 #define NEXT_ITEM(...) \
  45         (const enum rte_flow_item_type []){ \
  46                 __VA_ARGS__, RTE_FLOW_ITEM_TYPE_END, \
  47         }
  48
  49 /** Processor structure associated with a flow item. */
  50 struct mlx4_flow_proc_item {
  51         /** Bit-mask for fields supported by this PMD. */
  52         const void *mask_support;
  53         /** Bit-mask to use when @p item->mask is not provided. */
  54         const void *mask_default;
  55         /** Size in bytes for @p mask_support and @p mask_default. */
  56         const unsigned int mask_sz;
  57         /** Merge a pattern item into a flow rule handle. */
  58         int (*merge)(struct rte_flow *flow,
  59                      const struct rte_flow_item *item,
  60                      const struct mlx4_flow_proc_item *proc,
  61                      struct rte_flow_error *error);
  62         /** Size in bytes of the destination structure. */
  63         const unsigned int dst_sz;
  64         /** List of possible subsequent items. */
  65         const enum rte_flow_item_type *const next_item;
  66 };
  67
  68 /** Shared resources for drop flow rules. */
  69 struct mlx4_drop {
  70         struct ibv_qp *qp; /**< QP target. */
  71         struct ibv_cq *cq; /**< CQ associated with above QP. */
  72         struct mlx4_priv *priv; /**< Back pointer to private data. */
  73         uint32_t refcnt; /**< Reference count. */
  74 };
  75
  76 /**
  77  * Convert supported RSS hash field types between DPDK and Verbs formats.
  78  *
  79  * This function returns the supported (default) set when @p types has
  80  * special value 0.
  81  *
  82  * @param priv
  83  *   Pointer to private structure.
  84  * @param types
  85  *   Depending on @p verbs_to_dpdk, hash types in either DPDK (see struct
  86  *   rte_eth_rss_conf) or Verbs format.
  87  * @param verbs_to_dpdk
  88  *   A zero value converts @p types from DPDK to Verbs, a nonzero value
  89  *   performs the reverse operation.
  90  *
  91  * @return
  92  *   Converted RSS hash fields on success, (uint64_t)-1 otherwise and
  93  *   rte_errno is set.
  94  */
  95 uint64_t
  96 mlx4_conv_rss_types(struct mlx4_priv *priv, uint64_t types, int verbs_to_dpdk)
  97 {
  98         enum {
  99                 INNER,
 100                 IPV4, IPV4_1, IPV4_2, IPV6, IPV6_1, IPV6_2, IPV6_3,
 101                 TCP, UDP,
 102                 IPV4_TCP, IPV4_UDP, IPV6_TCP, IPV6_TCP_1, IPV6_UDP, IPV6_UDP_1,
 103         };
 104         enum {
 105                 VERBS_IPV4 = IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4,
 106                 VERBS_IPV6 = IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6,
 107                 VERBS_TCP = IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP,
 108                 VERBS_UDP = IBV_RX_HASH_SRC_PORT_UDP | IBV_RX_HASH_DST_PORT_UDP,
 109         };
 110         static const uint64_t dpdk[] = {
 111                 [INNER] = 0,
 112                 [IPV4] = ETH_RSS_IPV4,
 113                 [IPV4_1] = ETH_RSS_FRAG_IPV4,
 114                 [IPV4_2] = ETH_RSS_NONFRAG_IPV4_OTHER,
 115                 [IPV6] = ETH_RSS_IPV6,
 116                 [IPV6_1] = ETH_RSS_FRAG_IPV6,
 117                 [IPV6_2] = ETH_RSS_NONFRAG_IPV6_OTHER,
 118                 [IPV6_3] = ETH_RSS_IPV6_EX,
 119                 [TCP] = 0,
 120                 [UDP] = 0,
 121                 [IPV4_TCP] = ETH_RSS_NONFRAG_IPV4_TCP,
 122                 [IPV4_UDP] = ETH_RSS_NONFRAG_IPV4_UDP,
 123                 [IPV6_TCP] = ETH_RSS_NONFRAG_IPV6_TCP,
 124                 [IPV6_TCP_1] = ETH_RSS_IPV6_TCP_EX,
 125                 [IPV6_UDP] = ETH_RSS_NONFRAG_IPV6_UDP,
 126                 [IPV6_UDP_1] = ETH_RSS_IPV6_UDP_EX,
 127         };
 128         static const uint64_t verbs[RTE_DIM(dpdk)] = {
 129                 [INNER] = IBV_RX_HASH_INNER,
 130                 [IPV4] = VERBS_IPV4,
 131                 [IPV4_1] = VERBS_IPV4,
 132                 [IPV4_2] = VERBS_IPV4,
 133                 [IPV6] = VERBS_IPV6,
 134                 [IPV6_1] = VERBS_IPV6,
 135                 [IPV6_2] = VERBS_IPV6,
 136                 [IPV6_3] = VERBS_IPV6,
 137                 [TCP] = VERBS_TCP,
 138                 [UDP] = VERBS_UDP,
 139                 [IPV4_TCP] = VERBS_IPV4 | VERBS_TCP,
 140                 [IPV4_UDP] = VERBS_IPV4 | VERBS_UDP,
 141                 [IPV6_TCP] = VERBS_IPV6 | VERBS_TCP,
 142                 [IPV6_TCP_1] = VERBS_IPV6 | VERBS_TCP,
 143                 [IPV6_UDP] = VERBS_IPV6 | VERBS_UDP,
 144                 [IPV6_UDP_1] = VERBS_IPV6 | VERBS_UDP,
 145         };
 146         const uint64_t *in = verbs_to_dpdk ? verbs : dpdk;
 147         const uint64_t *out = verbs_to_dpdk ? dpdk : verbs;
 148         uint64_t seen = 0;
 149         uint64_t conv = 0;
 150         unsigned int i;
 151
 152         if (!types) {
 153                 if (!verbs_to_dpdk)
 154                         return priv->hw_rss_sup;
 155                 types = priv->hw_rss_sup;
 156         }
 157         for (i = 0; i != RTE_DIM(dpdk); ++i)
 158                 if (in[i] && (types & in[i]) == in[i]) {
 159                         seen |= types & in[i];
 160                         conv |= out[i];
 161                 }
 162         if ((verbs_to_dpdk || (conv & priv->hw_rss_sup) == conv) &&
 163             !(types & ~seen))
 164                 return conv;
 165         rte_errno = ENOTSUP;
 166         return (uint64_t)-1;
 167 }
 168
 169 /**
 170  * Merge Ethernet pattern item into flow rule handle.
 171  *
 172  * Additional mlx4-specific constraints on supported fields:
 173  *
 174  * - No support for partial masks, except in the specific case of matching
 175  *   all multicast traffic (@p spec->dst and @p mask->dst equal to
 176  *   01:00:00:00:00:00).
 177  * - Not providing @p item->spec or providing an empty @p mask->dst is
 178  *   *only* supported if the rule doesn't specify additional matching
 179  *   criteria (i.e. rule is promiscuous-like).
 180  *
 181  * @param[in, out] flow
 182  *   Flow rule handle to update.
 183  * @param[in] item
 184  *   Pattern item to merge.
 185  * @param[in] proc
 186  *   Associated item-processing object.
 187  * @param[out] error
 188  *   Perform verbose error reporting if not NULL.
 189  *
 190  * @return
 191  *   0 on success, a negative errno value otherwise and rte_errno is set.
 192  */
 193 static int
 194 mlx4_flow_merge_eth(struct rte_flow *flow,
 195                     const struct rte_flow_item *item,
 196                     const struct mlx4_flow_proc_item *proc,
 197                     struct rte_flow_error *error)
 198 {
 199         const struct rte_flow_item_eth *spec = item->spec;
 200         const struct rte_flow_item_eth *mask =
 201                 spec ? (item->mask ? item->mask : proc->mask_default) : NULL;
 202         struct ibv_flow_spec_eth *eth;
 203         const char *msg;
 204         unsigned int i;
 205
 206         if (mask) {
 207                 uint32_t sum_dst = 0;
 208                 uint32_t sum_src = 0;
 209
 210                 for (i = 0; i != sizeof(mask->dst.addr_bytes); ++i) {
 211                         sum_dst += mask->dst.addr_bytes[i];
 212                         sum_src += mask->src.addr_bytes[i];
 213                 }
 214                 if (sum_src) {
 215                         msg = "mlx4 does not support source MAC matching";
 216                         goto error;
 217                 } else if (!sum_dst) {
 218                         flow->promisc = 1;
 219                 } else if (sum_dst == 1 && mask->dst.addr_bytes[0] == 1) {
 220                         if (!(spec->dst.addr_bytes[0] & 1)) {
 221                                 msg = "mlx4 does not support the explicit"
 222                                         " exclusion of all multicast traffic";
 223                                 goto error;
 224                         }
 225                         flow->allmulti = 1;
 226                 } else if (sum_dst != (UINT8_C(0xff) * RTE_ETHER_ADDR_LEN)) {
 227                         msg = "mlx4 does not support matching partial"
 228                                 " Ethernet fields";
 229                         goto error;
 230                 }
 231         }
 232         if (!flow->ibv_attr)
 233                 return 0;
 234         if (flow->promisc) {
 235                 flow->ibv_attr->type = IBV_FLOW_ATTR_ALL_DEFAULT;
 236                 return 0;
 237         }
 238         if (flow->allmulti) {
 239                 flow->ibv_attr->type = IBV_FLOW_ATTR_MC_DEFAULT;
 240                 return 0;
 241         }
 242         ++flow->ibv_attr->num_of_specs;
 243         eth = (void *)((uintptr_t)flow->ibv_attr + flow->ibv_attr_size);
 244         *eth = (struct ibv_flow_spec_eth) {
 245                 .type = IBV_FLOW_SPEC_ETH,
 246                 .size = sizeof(*eth),
 247         };
 248         if (!mask) {
 249                 eth->val.dst_mac[0] = 0xff;
 250                 flow->ibv_attr->type = IBV_FLOW_ATTR_ALL_DEFAULT;
 251                 flow->promisc = 1;
 252                 return 0;
 253         }
 254         memcpy(eth->val.dst_mac, spec->dst.addr_bytes, RTE_ETHER_ADDR_LEN);
 255         memcpy(eth->mask.dst_mac, mask->dst.addr_bytes, RTE_ETHER_ADDR_LEN);
 256         /* Remove unwanted bits from values. */
 257         for (i = 0; i < RTE_ETHER_ADDR_LEN; ++i)
 258                 eth->val.dst_mac[i] &= eth->mask.dst_mac[i];
 259
 260         return 0;
 261 error:
 262         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 263                                   item, msg);
 264 }
 265
 266 /**
 267  * Merge VLAN pattern item into flow rule handle.
 268  *
 269  * Additional mlx4-specific constraints on supported fields:
 270  *
 271  * - Matching *all* VLAN traffic by omitting @p item->spec or providing an
 272  *   empty @p item->mask would also include non-VLAN traffic. Doing so is
 273  *   therefore unsupported.
 274  * - No support for partial masks.
 275  *
 276  * @param[in, out] flow
 277  *   Flow rule handle to update.
 278  * @param[in] item
 279  *   Pattern item to merge.
 280  * @param[in] proc
 281  *   Associated item-processing object.
 282  * @param[out] error
 283  *   Perform verbose error reporting if not NULL.
 284  *
 285  * @return
 286  *   0 on success, a negative errno value otherwise and rte_errno is set.
 287  */
 288 static int
 289 mlx4_flow_merge_vlan(struct rte_flow *flow,
 290                      const struct rte_flow_item *item,
 291                      const struct mlx4_flow_proc_item *proc,
 292                      struct rte_flow_error *error)
 293 {
 294         const struct rte_flow_item_vlan *spec = item->spec;
 295         const struct rte_flow_item_vlan *mask =
 296                 spec ? (item->mask ? item->mask : proc->mask_default) : NULL;
 297         struct ibv_flow_spec_eth *eth;
 298         const char *msg;
 299
 300         if (!mask || !mask->tci) {
 301                 msg = "mlx4 cannot match all VLAN traffic while excluding"
 302                         " non-VLAN traffic, TCI VID must be specified";
 303                 goto error;
 304         }
 305         if (mask->tci != RTE_BE16(0x0fff)) {
 306                 msg = "mlx4 does not support partial TCI VID matching";
 307                 goto error;
 308         }
 309         if (!flow->ibv_attr)
 310                 return 0;
 311         eth = (void *)((uintptr_t)flow->ibv_attr + flow->ibv_attr_size -
 312                        sizeof(*eth));
 313         eth->val.vlan_tag = spec->tci;
 314         eth->mask.vlan_tag = mask->tci;
 315         eth->val.vlan_tag &= eth->mask.vlan_tag;
 316         if (flow->ibv_attr->type == IBV_FLOW_ATTR_ALL_DEFAULT)
 317                 flow->ibv_attr->type = IBV_FLOW_ATTR_NORMAL;
 318         return 0;
 319 error:
 320         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 321                                   item, msg);
 322 }
 323
 324 /**
 325  * Merge IPv4 pattern item into flow rule handle.
 326  *
 327  * Additional mlx4-specific constraints on supported fields:
 328  *
 329  * - No support for partial masks.
 330  *
 331  * @param[in, out] flow
 332  *   Flow rule handle to update.
 333  * @param[in] item
 334  *   Pattern item to merge.
 335  * @param[in] proc
 336  *   Associated item-processing object.
 337  * @param[out] error
 338  *   Perform verbose error reporting if not NULL.
 339  *
 340  * @return
 341  *   0 on success, a negative errno value otherwise and rte_errno is set.
 342  */
 343 static int
 344 mlx4_flow_merge_ipv4(struct rte_flow *flow,
 345                      const struct rte_flow_item *item,
 346                      const struct mlx4_flow_proc_item *proc,
 347                      struct rte_flow_error *error)
 348 {
 349         const struct rte_flow_item_ipv4 *spec = item->spec;
 350         const struct rte_flow_item_ipv4 *mask =
 351                 spec ? (item->mask ? item->mask : proc->mask_default) : NULL;
 352         struct ibv_flow_spec_ipv4 *ipv4;
 353         const char *msg;
 354
 355         if (mask &&
 356             ((uint32_t)(mask->hdr.src_addr + 1) > UINT32_C(1) ||
 357              (uint32_t)(mask->hdr.dst_addr + 1) > UINT32_C(1))) {
 358                 msg = "mlx4 does not support matching partial IPv4 fields";
 359                 goto error;
 360         }
 361         if (!flow->ibv_attr)
 362                 return 0;
 363         ++flow->ibv_attr->num_of_specs;
 364         ipv4 = (void *)((uintptr_t)flow->ibv_attr + flow->ibv_attr_size);
 365         *ipv4 = (struct ibv_flow_spec_ipv4) {
 366                 .type = IBV_FLOW_SPEC_IPV4,
 367                 .size = sizeof(*ipv4),
 368         };
 369         if (!spec)
 370                 return 0;
 371         ipv4->val = (struct ibv_flow_ipv4_filter) {
 372                 .src_ip = spec->hdr.src_addr,
 373                 .dst_ip = spec->hdr.dst_addr,
 374         };
 375         ipv4->mask = (struct ibv_flow_ipv4_filter) {
 376                 .src_ip = mask->hdr.src_addr,
 377                 .dst_ip = mask->hdr.dst_addr,
 378         };
 379         /* Remove unwanted bits from values. */
 380         ipv4->val.src_ip &= ipv4->mask.src_ip;
 381         ipv4->val.dst_ip &= ipv4->mask.dst_ip;
 382         return 0;
 383 error:
 384         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 385                                   item, msg);
 386 }
 387
 388 /**
 389  * Merge UDP pattern item into flow rule handle.
 390  *
 391  * Additional mlx4-specific constraints on supported fields:
 392  *
 393  * - No support for partial masks.
 394  * - Due to HW/FW limitation, flow rule priority is not taken into account
 395  *   when matching UDP destination ports, doing is therefore only supported
 396  *   at the highest priority level (0).
 397  *
 398  * @param[in, out] flow
 399  *   Flow rule handle to update.
 400  * @param[in] item
 401  *   Pattern item to merge.
 402  * @param[in] proc
 403  *   Associated item-processing object.
 404  * @param[out] error
 405  *   Perform verbose error reporting if not NULL.
 406  *
 407  * @return
 408  *   0 on success, a negative errno value otherwise and rte_errno is set.
 409  */
 410 static int
 411 mlx4_flow_merge_udp(struct rte_flow *flow,
 412                     const struct rte_flow_item *item,
 413                     const struct mlx4_flow_proc_item *proc,
 414                     struct rte_flow_error *error)
 415 {
 416         const struct rte_flow_item_udp *spec = item->spec;
 417         const struct rte_flow_item_udp *mask =
 418                 spec ? (item->mask ? item->mask : proc->mask_default) : NULL;
 419         struct ibv_flow_spec_tcp_udp *udp;
 420         const char *msg;
 421
 422         if (mask &&
 423             ((uint16_t)(mask->hdr.src_port + 1) > UINT16_C(1) ||
 424              (uint16_t)(mask->hdr.dst_port + 1) > UINT16_C(1))) {
 425                 msg = "mlx4 does not support matching partial UDP fields";
 426                 goto error;
 427         }
 428         if (mask && mask->hdr.dst_port && flow->priority) {
 429                 msg = "combining UDP destination port matching with a nonzero"
 430                         " priority level is not supported";
 431                 goto error;
 432         }
 433         if (!flow->ibv_attr)
 434                 return 0;
 435         ++flow->ibv_attr->num_of_specs;
 436         udp = (void *)((uintptr_t)flow->ibv_attr + flow->ibv_attr_size);
 437         *udp = (struct ibv_flow_spec_tcp_udp) {
 438                 .type = IBV_FLOW_SPEC_UDP,
 439                 .size = sizeof(*udp),
 440         };
 441         if (!spec)
 442                 return 0;
 443         udp->val.dst_port = spec->hdr.dst_port;
 444         udp->val.src_port = spec->hdr.src_port;
 445         udp->mask.dst_port = mask->hdr.dst_port;
 446         udp->mask.src_port = mask->hdr.src_port;
 447         /* Remove unwanted bits from values. */
 448         udp->val.src_port &= udp->mask.src_port;
 449         udp->val.dst_port &= udp->mask.dst_port;
 450         return 0;
 451 error:
 452         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 453                                   item, msg);
 454 }
 455
 456 /**
 457  * Merge TCP pattern item into flow rule handle.
 458  *
 459  * Additional mlx4-specific constraints on supported fields:
 460  *
 461  * - No support for partial masks.
 462  *
 463  * @param[in, out] flow
 464  *   Flow rule handle to update.
 465  * @param[in] item
 466  *   Pattern item to merge.
 467  * @param[in] proc
 468  *   Associated item-processing object.
 469  * @param[out] error
 470  *   Perform verbose error reporting if not NULL.
 471  *
 472  * @return
 473  *   0 on success, a negative errno value otherwise and rte_errno is set.
 474  */
 475 static int
 476 mlx4_flow_merge_tcp(struct rte_flow *flow,
 477                     const struct rte_flow_item *item,
 478                     const struct mlx4_flow_proc_item *proc,
 479                     struct rte_flow_error *error)
 480 {
 481         const struct rte_flow_item_tcp *spec = item->spec;
 482         const struct rte_flow_item_tcp *mask =
 483                 spec ? (item->mask ? item->mask : proc->mask_default) : NULL;
 484         struct ibv_flow_spec_tcp_udp *tcp;
 485         const char *msg;
 486
 487         if (mask &&
 488             ((uint16_t)(mask->hdr.src_port + 1) > UINT16_C(1) ||
 489              (uint16_t)(mask->hdr.dst_port + 1) > UINT16_C(1))) {
 490                 msg = "mlx4 does not support matching partial TCP fields";
 491                 goto error;
 492         }
 493         if (!flow->ibv_attr)
 494                 return 0;
 495         ++flow->ibv_attr->num_of_specs;
 496         tcp = (void *)((uintptr_t)flow->ibv_attr + flow->ibv_attr_size);
 497         *tcp = (struct ibv_flow_spec_tcp_udp) {
 498                 .type = IBV_FLOW_SPEC_TCP,
 499                 .size = sizeof(*tcp),
 500         };
 501         if (!spec)
 502                 return 0;
 503         tcp->val.dst_port = spec->hdr.dst_port;
 504         tcp->val.src_port = spec->hdr.src_port;
 505         tcp->mask.dst_port = mask->hdr.dst_port;
 506         tcp->mask.src_port = mask->hdr.src_port;
 507         /* Remove unwanted bits from values. */
 508         tcp->val.src_port &= tcp->mask.src_port;
 509         tcp->val.dst_port &= tcp->mask.dst_port;
 510         return 0;
 511 error:
 512         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 513                                   item, msg);
 514 }
 515
 516 /**
 517  * Perform basic sanity checks on a pattern item.
 518  *
 519  * @param[in] item
 520  *   Item specification.
 521  * @param[in] proc
 522  *   Associated item-processing object.
 523  * @param[out] error
 524  *   Perform verbose error reporting if not NULL.
 525  *
 526  * @return
 527  *   0 on success, a negative errno value otherwise and rte_errno is set.
 528  */
 529 static int
 530 mlx4_flow_item_check(const struct rte_flow_item *item,
 531                      const struct mlx4_flow_proc_item *proc,
 532                      struct rte_flow_error *error)
 533 {
 534         const uint8_t *mask;
 535         unsigned int i;
 536
 537         /* item->last and item->mask cannot exist without item->spec. */
 538         if (!item->spec && (item->mask || item->last))
 539                 return rte_flow_error_set
 540                         (error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, item,
 541                          "\"mask\" or \"last\" field provided without a"
 542                          " corresponding \"spec\"");
 543         /* No spec, no mask, no problem. */
 544         if (!item->spec)
 545                 return 0;
 546         mask = item->mask ?
 547                 (const uint8_t *)item->mask :
 548                 (const uint8_t *)proc->mask_default;
 549         MLX4_ASSERT(mask);
 550         /*
 551          * Single-pass check to make sure that:
 552          * - Mask is supported, no bits are set outside proc->mask_support.
 553          * - Both item->spec and item->last are included in mask.
 554          */
 555         for (i = 0; i != proc->mask_sz; ++i) {
 556                 if (!mask[i])
 557                         continue;
 558                 if ((mask[i] | ((const uint8_t *)proc->mask_support)[i]) !=
 559                     ((const uint8_t *)proc->mask_support)[i])
 560                         return rte_flow_error_set
 561                                 (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 562                                  item, "unsupported field found in \"mask\"");
 563                 if (item->last &&
 564                     (((const uint8_t *)item->spec)[i] & mask[i]) !=
 565                     (((const uint8_t *)item->last)[i] & mask[i]))
 566                         return rte_flow_error_set
 567                                 (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 568                                  item,
 569                                  "range between \"spec\" and \"last\""
 570                                  " is larger than \"mask\"");
 571         }
 572         return 0;
 573 }
 574
 575 /** Graph of supported items and associated actions. */
 576 static const struct mlx4_flow_proc_item mlx4_flow_proc_item_list[] = {
 577         [RTE_FLOW_ITEM_TYPE_END] = {
 578                 .next_item = NEXT_ITEM(RTE_FLOW_ITEM_TYPE_ETH),
 579         },
 580         [RTE_FLOW_ITEM_TYPE_ETH] = {
 581                 .next_item = NEXT_ITEM(RTE_FLOW_ITEM_TYPE_VLAN,
 582                                        RTE_FLOW_ITEM_TYPE_IPV4),
 583                 .mask_support = &(const struct rte_flow_item_eth){
 584                         /* Only destination MAC can be matched. */
 585                         .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
 586                 },
 587                 .mask_default = &rte_flow_item_eth_mask,
 588                 .mask_sz = sizeof(struct rte_flow_item_eth),
 589                 .merge = mlx4_flow_merge_eth,
 590                 .dst_sz = sizeof(struct ibv_flow_spec_eth),
 591         },
 592         [RTE_FLOW_ITEM_TYPE_VLAN] = {
 593                 .next_item = NEXT_ITEM(RTE_FLOW_ITEM_TYPE_IPV4),
 594                 .mask_support = &(const struct rte_flow_item_vlan){
 595                         /* Only TCI VID matching is supported. */
 596                         .tci = RTE_BE16(0x0fff),
 597                 },
 598                 .mask_default = &rte_flow_item_vlan_mask,
 599                 .mask_sz = sizeof(struct rte_flow_item_vlan),
 600                 .merge = mlx4_flow_merge_vlan,
 601                 .dst_sz = 0,
 602         },
 603         [RTE_FLOW_ITEM_TYPE_IPV4] = {
 604                 .next_item = NEXT_ITEM(RTE_FLOW_ITEM_TYPE_UDP,
 605                                        RTE_FLOW_ITEM_TYPE_TCP),
 606                 .mask_support = &(const struct rte_flow_item_ipv4){
 607                         .hdr = {
 608                                 .src_addr = RTE_BE32(0xffffffff),
 609                                 .dst_addr = RTE_BE32(0xffffffff),
 610                         },
 611                 },
 612                 .mask_default = &rte_flow_item_ipv4_mask,
 613                 .mask_sz = sizeof(struct rte_flow_item_ipv4),
 614                 .merge = mlx4_flow_merge_ipv4,
 615                 .dst_sz = sizeof(struct ibv_flow_spec_ipv4),
 616         },
 617         [RTE_FLOW_ITEM_TYPE_UDP] = {
 618                 .mask_support = &(const struct rte_flow_item_udp){
 619                         .hdr = {
 620                                 .src_port = RTE_BE16(0xffff),
 621                                 .dst_port = RTE_BE16(0xffff),
 622                         },
 623                 },
 624                 .mask_default = &rte_flow_item_udp_mask,
 625                 .mask_sz = sizeof(struct rte_flow_item_udp),
 626                 .merge = mlx4_flow_merge_udp,
 627                 .dst_sz = sizeof(struct ibv_flow_spec_tcp_udp),
 628         },
 629         [RTE_FLOW_ITEM_TYPE_TCP] = {
 630                 .mask_support = &(const struct rte_flow_item_tcp){
 631                         .hdr = {
 632                                 .src_port = RTE_BE16(0xffff),
 633                                 .dst_port = RTE_BE16(0xffff),
 634                         },
 635                 },
 636                 .mask_default = &rte_flow_item_tcp_mask,
 637                 .mask_sz = sizeof(struct rte_flow_item_tcp),
 638                 .merge = mlx4_flow_merge_tcp,
 639                 .dst_sz = sizeof(struct ibv_flow_spec_tcp_udp),
 640         },
 641 };
 642
 643 /**
 644  * Make sure a flow rule is supported and initialize associated structure.
 645  *
 646  * @param priv
 647  *   Pointer to private structure.
 648  * @param[in] attr
 649  *   Flow rule attributes.
 650  * @param[in] pattern
 651  *   Pattern specification (list terminated by the END pattern item).
 652  * @param[in] actions
 653  *   Associated actions (list terminated by the END action).
 654  * @param[out] error
 655  *   Perform verbose error reporting if not NULL.
 656  * @param[in, out] addr
 657  *   Buffer where the resulting flow rule handle pointer must be stored.
 658  *   If NULL, stop processing after validation stage.
 659  *
 660  * @return
 661  *   0 on success, a negative errno value otherwise and rte_errno is set.
 662  */
 663 static int
 664 mlx4_flow_prepare(struct mlx4_priv *priv,
 665                   const struct rte_flow_attr *attr,
 666                   const struct rte_flow_item pattern[],
 667                   const struct rte_flow_action actions[],
 668                   struct rte_flow_error *error,
 669                   struct rte_flow **addr)
 670 {
 671         const struct rte_flow_item *item;
 672         const struct rte_flow_action *action;
 673         const struct mlx4_flow_proc_item *proc;
 674         struct rte_flow temp = { .ibv_attr_size = sizeof(*temp.ibv_attr) };
 675         struct rte_flow *flow = &temp;
 676         const char *msg = NULL;
 677         int overlap;
 678
 679         if (attr->group)
 680                 return rte_flow_error_set
 681                         (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_GROUP,
 682                          NULL, "groups are not supported");
 683         if (attr->priority > MLX4_FLOW_PRIORITY_LAST)
 684                 return rte_flow_error_set
 685                         (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY,
 686                          NULL, "maximum priority level is "
 687                          MLX4_STR_EXPAND(MLX4_FLOW_PRIORITY_LAST));
 688         if (attr->egress)
 689                 return rte_flow_error_set
 690                         (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_EGRESS,
 691                          NULL, "egress is not supported");
 692         if (attr->transfer)
 693                 return rte_flow_error_set
 694                         (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_TRANSFER,
 695                          NULL, "transfer is not supported");
 696         if (!attr->ingress)
 697                 return rte_flow_error_set
 698                         (error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ATTR_INGRESS,
 699                          NULL, "only ingress is supported");
 700 fill:
 701         overlap = 0;
 702         proc = mlx4_flow_proc_item_list;
 703         flow->priority = attr->priority;
 704         /* Go over pattern. */
 705         for (item = pattern; item->type; ++item) {
 706                 const struct mlx4_flow_proc_item *next = NULL;
 707                 unsigned int i;
 708                 int err;
 709
 710                 if (item->type == RTE_FLOW_ITEM_TYPE_VOID)
 711                         continue;
 712                 if (item->type == MLX4_FLOW_ITEM_TYPE_INTERNAL) {
 713                         flow->internal = 1;
 714                         continue;
 715                 }
 716                 if (flow->promisc || flow->allmulti) {
 717                         msg = "mlx4 does not support additional matching"
 718                                 " criteria combined with indiscriminate"
 719                                 " matching on Ethernet headers";
 720                         goto exit_item_not_supported;
 721                 }
 722                 for (i = 0; proc->next_item && proc->next_item[i]; ++i) {
 723                         if (proc->next_item[i] == item->type) {
 724                                 next = &mlx4_flow_proc_item_list[item->type];
 725                                 break;
 726                         }
 727                 }
 728                 if (!next)
 729                         goto exit_item_not_supported;
 730                 proc = next;
 731                 /*
 732                  * Perform basic sanity checks only once, while handle is
 733                  * not allocated.
 734                  */
 735                 if (flow == &temp) {
 736                         err = mlx4_flow_item_check(item, proc, error);
 737                         if (err)
 738                                 return err;
 739                 }
 740                 if (proc->merge) {
 741                         err = proc->merge(flow, item, proc, error);
 742                         if (err)
 743                                 return err;
 744                 }
 745                 flow->ibv_attr_size += proc->dst_sz;
 746         }
 747         /* Go over actions list. */
 748         for (action = actions; action->type; ++action) {
 749                 /* This one may appear anywhere multiple times. */
 750                 if (action->type == RTE_FLOW_ACTION_TYPE_VOID)
 751                         continue;
 752                 /* Fate-deciding actions may appear exactly once. */
 753                 if (overlap) {
 754                         msg = "cannot combine several fate-deciding actions,"
 755                                 " choose between DROP, QUEUE or RSS";
 756                         goto exit_action_not_supported;
 757                 }
 758                 overlap = 1;
 759                 switch (action->type) {
 760                         const struct rte_flow_action_queue *queue;
 761                         const struct rte_flow_action_rss *rss;
 762                         const uint8_t *rss_key;
 763                         uint32_t rss_key_len;
 764                         uint64_t fields;
 765                         unsigned int i;
 766
 767                 case RTE_FLOW_ACTION_TYPE_DROP:
 768                         flow->drop = 1;
 769                         break;
 770                 case RTE_FLOW_ACTION_TYPE_QUEUE:
 771                         if (flow->rss)
 772                                 break;
 773                         queue = action->conf;
 774                         if (queue->index >= ETH_DEV(priv)->data->nb_rx_queues) {
 775                                 msg = "queue target index beyond number of"
 776                                         " configured Rx queues";
 777                                 goto exit_action_not_supported;
 778                         }
 779                         flow->rss = mlx4_rss_get
 780                                 (priv, 0, mlx4_rss_hash_key_default, 1,
 781                                  &queue->index);
 782                         if (!flow->rss) {
 783                                 msg = "not enough resources for additional"
 784                                         " single-queue RSS context";
 785                                 goto exit_action_not_supported;
 786                         }
 787                         break;
 788                 case RTE_FLOW_ACTION_TYPE_RSS:
 789                         if (flow->rss)
 790                                 break;
 791                         rss = action->conf;
 792                         /* Default RSS configuration if none is provided. */
 793                         if (rss->key_len) {
 794                                 rss_key = rss->key ?
 795                                           rss->key : mlx4_rss_hash_key_default;
 796                                 rss_key_len = rss->key_len;
 797                         } else {
 798                                 rss_key = mlx4_rss_hash_key_default;
 799                                 rss_key_len = MLX4_RSS_HASH_KEY_SIZE;
 800                         }
 801                         /* Sanity checks. */
 802                         for (i = 0; i < rss->queue_num; ++i)
 803                                 if (rss->queue[i] >=
 804                                     ETH_DEV(priv)->data->nb_rx_queues)
 805                                         break;
 806                         if (i != rss->queue_num) {
 807                                 msg = "queue index target beyond number of"
 808                                         " configured Rx queues";
 809                                 goto exit_action_not_supported;
 810                         }
 811                         if (!rte_is_power_of_2(rss->queue_num)) {
 812                                 msg = "for RSS, mlx4 requires the number of"
 813                                         " queues to be a power of two";
 814                                 goto exit_action_not_supported;
 815                         }
 816                         if (rss_key_len != sizeof(flow->rss->key)) {
 817                                 msg = "mlx4 supports exactly one RSS hash key"
 818                                         " length: "
 819                                         MLX4_STR_EXPAND(MLX4_RSS_HASH_KEY_SIZE);
 820                                 goto exit_action_not_supported;
 821                         }
 822                         for (i = 1; i < rss->queue_num; ++i)
 823                                 if (rss->queue[i] - rss->queue[i - 1] != 1)
 824                                         break;
 825                         if (i != rss->queue_num) {
 826                                 msg = "mlx4 requires RSS contexts to use"
 827                                         " consecutive queue indices only";
 828                                 goto exit_action_not_supported;
 829                         }
 830                         if (rss->queue[0] % rss->queue_num) {
 831                                 msg = "mlx4 requires the first queue of a RSS"
 832                                         " context to be aligned on a multiple"
 833                                         " of the context size";
 834                                 goto exit_action_not_supported;
 835                         }
 836                         if (rss->func &&
 837                             rss->func != RTE_ETH_HASH_FUNCTION_TOEPLITZ) {
 838                                 msg = "the only supported RSS hash function"
 839                                         " is Toeplitz";
 840                                 goto exit_action_not_supported;
 841                         }
 842                         if (rss->level) {
 843                                 msg = "a nonzero RSS encapsulation level is"
 844                                         " not supported";
 845                                 goto exit_action_not_supported;
 846                         }
 847                         rte_errno = 0;
 848                         fields = mlx4_conv_rss_types(priv, rss->types, 0);
 849                         if (fields == (uint64_t)-1 && rte_errno) {
 850                                 msg = "unsupported RSS hash type requested";
 851                                 goto exit_action_not_supported;
 852                         }
 853                         flow->rss = mlx4_rss_get
 854                                 (priv, fields, rss_key, rss->queue_num,
 855                                  rss->queue);
 856                         if (!flow->rss) {
 857                                 msg = "either invalid parameters or not enough"
 858                                         " resources for additional multi-queue"
 859                                         " RSS context";
 860                                 goto exit_action_not_supported;
 861                         }
 862                         break;
 863                 default:
 864                         goto exit_action_not_supported;
 865                 }
 866         }
 867         /* When fate is unknown, drop traffic. */
 868         if (!overlap)
 869                 flow->drop = 1;
 870         /* Validation ends here. */
 871         if (!addr) {
 872                 if (flow->rss)
 873                         mlx4_rss_put(flow->rss);
 874                 return 0;
 875         }
 876         if (flow == &temp) {
 877                 /* Allocate proper handle based on collected data. */
 878                 const struct mlx4_malloc_vec vec[] = {
 879                         {
 880                                 .align = alignof(struct rte_flow),
 881                                 .size = sizeof(*flow),
 882                                 .addr = (void **)&flow,
 883                         },
 884                         {
 885                                 .align = alignof(struct ibv_flow_attr),
 886                                 .size = temp.ibv_attr_size,
 887                                 .addr = (void **)&temp.ibv_attr,
 888                         },
 889                 };
 890
 891                 if (!mlx4_zmallocv(__func__, vec, RTE_DIM(vec))) {
 892                         if (temp.rss)
 893                                 mlx4_rss_put(temp.rss);
 894                         return rte_flow_error_set
 895                                 (error, -rte_errno,
 896                                  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
 897                                  "flow rule handle allocation failure");
 898                 }
 899                 /* Most fields will be updated by second pass. */
 900                 *flow = (struct rte_flow){
 901                         .ibv_attr = temp.ibv_attr,
 902                         .ibv_attr_size = sizeof(*flow->ibv_attr),
 903                         .rss = temp.rss,
 904                 };
 905                 *flow->ibv_attr = (struct ibv_flow_attr){
 906                         .type = IBV_FLOW_ATTR_NORMAL,
 907                         .size = sizeof(*flow->ibv_attr),
 908                         .priority = attr->priority,
 909                         .port = priv->port,
 910                 };
 911                 goto fill;
 912         }
 913         *addr = flow;
 914         return 0;
 915 exit_item_not_supported:
 916         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
 917                                   item, msg ? msg : "item not supported");
 918 exit_action_not_supported:
 919         return rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ACTION,
 920                                   action, msg ? msg : "action not supported");
 921 }
 922
 923 /**
 924  * Validate a flow supported by the NIC.
 925  *
 926  * @see rte_flow_validate()
 927  * @see rte_flow_ops
 928  */
 929 static int
 930 mlx4_flow_validate(struct rte_eth_dev *dev,
 931                    const struct rte_flow_attr *attr,
 932                    const struct rte_flow_item pattern[],
 933                    const struct rte_flow_action actions[],
 934                    struct rte_flow_error *error)
 935 {
 936         struct mlx4_priv *priv = dev->data->dev_private;
 937
 938         return mlx4_flow_prepare(priv, attr, pattern, actions, error, NULL);
 939 }
 940
 941 /**
 942  * Get a drop flow rule resources instance.
 943  *
 944  * @param priv
 945  *   Pointer to private structure.
 946  *
 947  * @return
 948  *   Pointer to drop flow resources on success, NULL otherwise and rte_errno
 949  *   is set.
 950  */
 951 static struct mlx4_drop *
 952 mlx4_drop_get(struct mlx4_priv *priv)
 953 {
 954         struct mlx4_drop *drop = priv->drop;
 955
 956         if (drop) {
 957                 MLX4_ASSERT(drop->refcnt);
 958                 MLX4_ASSERT(drop->priv == priv);
 959                 ++drop->refcnt;
 960                 return drop;
 961         }
 962         drop = rte_malloc(__func__, sizeof(*drop), 0);
 963         if (!drop)
 964                 goto error;
 965         *drop = (struct mlx4_drop){
 966                 .priv = priv,
 967                 .refcnt = 1,
 968         };
 969         drop->cq = mlx4_glue->create_cq(priv->ctx, 1, NULL, NULL, 0);
 970         if (!drop->cq)
 971                 goto error;
 972         drop->qp = mlx4_glue->create_qp
 973                 (priv->pd,
 974                  &(struct ibv_qp_init_attr){
 975                         .send_cq = drop->cq,
 976                         .recv_cq = drop->cq,
 977                         .qp_type = IBV_QPT_RAW_PACKET,
 978                  });
 979         if (!drop->qp)
 980                 goto error;
 981         priv->drop = drop;
 982         return drop;
 983 error:
 984         if (drop) {
 985                 if (drop->qp)
 986                         claim_zero(mlx4_glue->destroy_qp(drop->qp));
 987                 if (drop->cq)
 988                         claim_zero(mlx4_glue->destroy_cq(drop->cq));
 989                 rte_free(drop);
 990         }
 991         rte_errno = ENOMEM;
 992         return NULL;
 993 }
 994
 995 /**
 996  * Give back a drop flow rule resources instance.
 997  *
 998  * @param drop
 999  *   Pointer to drop flow rule resources.
1000  */
1001 static void
1002 mlx4_drop_put(struct mlx4_drop *drop)
1003 {
1004         MLX4_ASSERT(drop->refcnt);
1005         if (--drop->refcnt)
1006                 return;
1007         drop->priv->drop = NULL;
1008         claim_zero(mlx4_glue->destroy_qp(drop->qp));
1009         claim_zero(mlx4_glue->destroy_cq(drop->cq));
1010         rte_free(drop);
1011 }
1012
1013 /**
1014  * Toggle a configured flow rule.
1015  *
1016  * @param priv
1017  *   Pointer to private structure.
1018  * @param flow
1019  *   Flow rule handle to toggle.
1020  * @param enable
1021  *   Whether associated Verbs flow must be created or removed.
1022  * @param[out] error
1023  *   Perform verbose error reporting if not NULL.
1024  *
1025  * @return
1026  *   0 on success, a negative errno value otherwise and rte_errno is set.
1027  */
1028 static int
1029 mlx4_flow_toggle(struct mlx4_priv *priv,
1030                  struct rte_flow *flow,
1031                  int enable,
1032                  struct rte_flow_error *error)
1033 {
1034         struct ibv_qp *qp = NULL;
1035         const char *msg;
1036         int err;
1037
1038         if (!enable) {
1039                 if (!flow->ibv_flow)
1040                         return 0;
1041                 claim_zero(mlx4_glue->destroy_flow(flow->ibv_flow));
1042                 flow->ibv_flow = NULL;
1043                 if (flow->drop)
1044                         mlx4_drop_put(priv->drop);
1045                 else if (flow->rss)
1046                         mlx4_rss_detach(flow->rss);
1047                 return 0;
1048         }
1049         MLX4_ASSERT(flow->ibv_attr);
1050         if (!flow->internal &&
1051             !priv->isolated &&
1052             flow->ibv_attr->priority == MLX4_FLOW_PRIORITY_LAST) {
1053                 if (flow->ibv_flow) {
1054                         claim_zero(mlx4_glue->destroy_flow(flow->ibv_flow));
1055                         flow->ibv_flow = NULL;
1056                         if (flow->drop)
1057                                 mlx4_drop_put(priv->drop);
1058                         else if (flow->rss)
1059                                 mlx4_rss_detach(flow->rss);
1060                 }
1061                 err = EACCES;
1062                 msg = ("priority level "
1063                        MLX4_STR_EXPAND(MLX4_FLOW_PRIORITY_LAST)
1064                        " is reserved when not in isolated mode");
1065                 goto error;
1066         }
1067         if (flow->rss) {
1068                 struct mlx4_rss *rss = flow->rss;
1069                 int missing = 0;
1070                 unsigned int i;
1071
1072                 /* Stop at the first nonexistent target queue. */
1073                 for (i = 0; i != rss->queues; ++i)
1074                         if (rss->queue_id[i] >=
1075                             ETH_DEV(priv)->data->nb_rx_queues ||
1076                             !ETH_DEV(priv)->data->rx_queues[rss->queue_id[i]]) {
1077                                 missing = 1;
1078                                 break;
1079                         }
1080                 if (flow->ibv_flow) {
1081                         if (missing ^ !flow->drop)
1082                                 return 0;
1083                         /* Verbs flow needs updating. */
1084                         claim_zero(mlx4_glue->destroy_flow(flow->ibv_flow));
1085                         flow->ibv_flow = NULL;
1086                         if (flow->drop)
1087                                 mlx4_drop_put(priv->drop);
1088                         else
1089                                 mlx4_rss_detach(rss);
1090                 }
1091                 if (!missing) {
1092                         err = mlx4_rss_attach(rss);
1093                         if (err) {
1094                                 err = -err;
1095                                 msg = "cannot create indirection table or hash"
1096                                         " QP to associate flow rule with";
1097                                 goto error;
1098                         }
1099                         qp = rss->qp;
1100                 }
1101                 /* A missing target queue drops traffic implicitly. */
1102                 flow->drop = missing;
1103         }
1104         if (flow->drop) {
1105                 if (flow->ibv_flow)
1106                         return 0;
1107                 mlx4_drop_get(priv);
1108                 if (!priv->drop) {
1109                         err = rte_errno;
1110                         msg = "resources for drop flow rule cannot be created";
1111                         goto error;
1112                 }
1113                 qp = priv->drop->qp;
1114         }
1115         MLX4_ASSERT(qp);
1116         if (flow->ibv_flow)
1117                 return 0;
1118         flow->ibv_flow = mlx4_glue->create_flow(qp, flow->ibv_attr);
1119         if (flow->ibv_flow)
1120                 return 0;
1121         if (flow->drop)
1122                 mlx4_drop_put(priv->drop);
1123         else if (flow->rss)
1124                 mlx4_rss_detach(flow->rss);
1125         err = errno;
1126         msg = "flow rule rejected by device";
1127 error:
1128         return rte_flow_error_set
1129                 (error, err, RTE_FLOW_ERROR_TYPE_HANDLE, flow, msg);
1130 }
1131
1132 /**
1133  * Create a flow.
1134  *
1135  * @see rte_flow_create()
1136  * @see rte_flow_ops
1137  */
1138 static struct rte_flow *
1139 mlx4_flow_create(struct rte_eth_dev *dev,
1140                  const struct rte_flow_attr *attr,
1141                  const struct rte_flow_item pattern[],
1142                  const struct rte_flow_action actions[],
1143                  struct rte_flow_error *error)
1144 {
1145         struct mlx4_priv *priv = dev->data->dev_private;
1146         struct rte_flow *flow;
1147         int err;
1148
1149         err = mlx4_flow_prepare(priv, attr, pattern, actions, error, &flow);
1150         if (err)
1151                 return NULL;
1152         err = mlx4_flow_toggle(priv, flow, priv->started, error);
1153         if (!err) {
1154                 struct rte_flow *curr = LIST_FIRST(&priv->flows);
1155
1156                 /* New rules are inserted after internal ones. */
1157                 if (!curr || !curr->internal) {
1158                         LIST_INSERT_HEAD(&priv->flows, flow, next);
1159                 } else {
1160                         while (LIST_NEXT(curr, next) &&
1161                                LIST_NEXT(curr, next)->internal)
1162                                 curr = LIST_NEXT(curr, next);
1163                         LIST_INSERT_AFTER(curr, flow, next);
1164                 }
1165                 return flow;
1166         }
1167         if (flow->rss)
1168                 mlx4_rss_put(flow->rss);
1169         rte_flow_error_set(error, -err, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
1170                            error->message);
1171         rte_free(flow);
1172         return NULL;
1173 }
1174
1175 /**
1176  * Configure isolated mode.
1177  *
1178  * @see rte_flow_isolate()
1179  * @see rte_flow_ops
1180  */
1181 static int
1182 mlx4_flow_isolate(struct rte_eth_dev *dev,
1183                   int enable,
1184                   struct rte_flow_error *error)
1185 {
1186         struct mlx4_priv *priv = dev->data->dev_private;
1187
1188         if (!!enable == !!priv->isolated)
1189                 return 0;
1190         priv->isolated = !!enable;
1191         if (mlx4_flow_sync(priv, error)) {
1192                 priv->isolated = !enable;
1193                 return -rte_errno;
1194         }
1195         return 0;
1196 }
1197
1198 /**
1199  * Destroy a flow rule.
1200  *
1201  * @see rte_flow_destroy()
1202  * @see rte_flow_ops
1203  */
1204 static int
1205 mlx4_flow_destroy(struct rte_eth_dev *dev,
1206                   struct rte_flow *flow,
1207                   struct rte_flow_error *error)
1208 {
1209         struct mlx4_priv *priv = dev->data->dev_private;
1210         int err = mlx4_flow_toggle(priv, flow, 0, error);
1211
1212         if (err)
1213                 return err;
1214         LIST_REMOVE(flow, next);
1215         if (flow->rss)
1216                 mlx4_rss_put(flow->rss);
1217         rte_free(flow);
1218         return 0;
1219 }
1220
1221 /**
1222  * Destroy user-configured flow rules.
1223  *
1224  * This function skips internal flows rules.
1225  *
1226  * @see rte_flow_flush()
1227  * @see rte_flow_ops
1228  */
1229 static int
1230 mlx4_flow_flush(struct rte_eth_dev *dev,
1231                 struct rte_flow_error *error)
1232 {
1233         struct mlx4_priv *priv = dev->data->dev_private;
1234         struct rte_flow *flow = LIST_FIRST(&priv->flows);
1235
1236         while (flow) {
1237                 struct rte_flow *next = LIST_NEXT(flow, next);
1238
1239                 if (!flow->internal)
1240                         mlx4_flow_destroy(dev, flow, error);
1241                 flow = next;
1242         }
1243         return 0;
1244 }
1245
1246 /**
1247  * Helper function to determine the next configured VLAN filter.
1248  *
1249  * @param priv
1250  *   Pointer to private structure.
1251  * @param vlan
1252  *   VLAN ID to use as a starting point.
1253  *
1254  * @return
1255  *   Next configured VLAN ID or a high value (>= 4096) if there is none.
1256  */
1257 static uint16_t
1258 mlx4_flow_internal_next_vlan(struct mlx4_priv *priv, uint16_t vlan)
1259 {
1260         while (vlan < 4096) {
1261                 if (ETH_DEV(priv)->data->vlan_filter_conf.ids[vlan / 64] &
1262                     (UINT64_C(1) << (vlan % 64)))
1263                         return vlan;
1264                 ++vlan;
1265         }
1266         return vlan;
1267 }
1268
1269 /**
1270  * Generate internal flow rules.
1271  *
1272  * Various flow rules are created depending on the mode the device is in:
1273  *
1274  * 1. Promiscuous:
1275  *       port MAC + broadcast + catch-all (VLAN filtering is ignored).
1276  * 2. All multicast:
1277  *       port MAC/VLAN + broadcast + catch-all multicast.
1278  * 3. Otherwise:
1279  *       port MAC/VLAN + broadcast MAC/VLAN.
1280  *
1281  * About MAC flow rules:
1282  *
1283  * - MAC flow rules are generated from @p dev->data->mac_addrs
1284  *   (@p priv->mac array).
1285  * - An additional flow rule for Ethernet broadcasts is also generated.
1286  * - All these are per-VLAN if @p DEV_RX_OFFLOAD_VLAN_FILTER
1287  *   is enabled and VLAN filters are configured.
1288  *
1289  * @param priv
1290  *   Pointer to private structure.
1291  * @param[out] error
1292  *   Perform verbose error reporting if not NULL.
1293  *
1294  * @return
1295  *   0 on success, a negative errno value otherwise and rte_errno is set.
1296  */
1297 static int
1298 mlx4_flow_internal(struct mlx4_priv *priv, struct rte_flow_error *error)
1299 {
1300         struct rte_flow_attr attr = {
1301                 .priority = MLX4_FLOW_PRIORITY_LAST,
1302                 .ingress = 1,
1303         };
1304         struct rte_flow_item_eth eth_spec;
1305         const struct rte_flow_item_eth eth_mask = {
1306                 .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
1307         };
1308         const struct rte_flow_item_eth eth_allmulti = {
1309                 .dst.addr_bytes = "\x01\x00\x00\x00\x00\x00",
1310         };
1311         struct rte_flow_item_vlan vlan_spec;
1312         const struct rte_flow_item_vlan vlan_mask = {
1313                 .tci = RTE_BE16(0x0fff),
1314         };
1315         struct rte_flow_item pattern[] = {
1316                 {
1317                         .type = MLX4_FLOW_ITEM_TYPE_INTERNAL,
1318                 },
1319                 {
1320                         .type = RTE_FLOW_ITEM_TYPE_ETH,
1321                         .spec = &eth_spec,
1322                         .mask = &eth_mask,
1323                 },
1324                 {
1325                         /* Replaced with VLAN if filtering is enabled. */
1326                         .type = RTE_FLOW_ITEM_TYPE_END,
1327                 },
1328                 {
1329                         .type = RTE_FLOW_ITEM_TYPE_END,
1330                 },
1331         };
1332         /*
1333          * Round number of queues down to their previous power of 2 to
1334          * comply with RSS context limitations. Extra queues silently do not
1335          * get RSS by default.
1336          */
1337         uint32_t queues =
1338                 rte_align32pow2(ETH_DEV(priv)->data->nb_rx_queues + 1) >> 1;
1339         uint16_t queue[queues];
1340         struct rte_flow_action_rss action_rss = {
1341                 .func = RTE_ETH_HASH_FUNCTION_DEFAULT,
1342                 .level = 0,
1343                 .types = 0,
1344                 .key_len = MLX4_RSS_HASH_KEY_SIZE,
1345                 .queue_num = queues,
1346                 .key = mlx4_rss_hash_key_default,
1347                 .queue = queue,
1348         };
1349         struct rte_flow_action actions[] = {
1350                 {
1351                         .type = RTE_FLOW_ACTION_TYPE_RSS,
1352                         .conf = &action_rss,
1353                 },
1354                 {
1355                         .type = RTE_FLOW_ACTION_TYPE_END,
1356                 },
1357         };
1358         struct rte_ether_addr *rule_mac = &eth_spec.dst;
1359         rte_be16_t *rule_vlan =
1360                 (ETH_DEV(priv)->data->dev_conf.rxmode.offloads &
1361                  DEV_RX_OFFLOAD_VLAN_FILTER) &&
1362                 !ETH_DEV(priv)->data->promiscuous ?
1363                 &vlan_spec.tci :
1364                 NULL;
1365         uint16_t vlan = 0;
1366         struct rte_flow *flow;
1367         unsigned int i;
1368         int err = 0;
1369
1370         /* Nothing to be done if there are no Rx queues. */
1371         if (!queues)
1372                 goto error;
1373         /* Prepare default RSS configuration. */
1374         for (i = 0; i != queues; ++i)
1375                 queue[i] = i;
1376         /*
1377          * Set up VLAN item if filtering is enabled and at least one VLAN
1378          * filter is configured.
1379          */
1380         if (rule_vlan) {
1381                 vlan = mlx4_flow_internal_next_vlan(priv, 0);
1382                 if (vlan < 4096) {
1383                         pattern[2] = (struct rte_flow_item){
1384                                 .type = RTE_FLOW_ITEM_TYPE_VLAN,
1385                                 .spec = &vlan_spec,
1386                                 .mask = &vlan_mask,
1387                         };
1388 next_vlan:
1389                         *rule_vlan = rte_cpu_to_be_16(vlan);
1390                 } else {
1391                         rule_vlan = NULL;
1392                 }
1393         }
1394         for (i = 0; i != RTE_DIM(priv->mac) + 1; ++i) {
1395                 const struct rte_ether_addr *mac;
1396
1397                 /* Broadcasts are handled by an extra iteration. */
1398                 if (i < RTE_DIM(priv->mac))
1399                         mac = &priv->mac[i];
1400                 else
1401                         mac = &eth_mask.dst;
1402                 if (rte_is_zero_ether_addr(mac))
1403                         continue;
1404                 /* Check if MAC flow rule is already present. */
1405                 for (flow = LIST_FIRST(&priv->flows);
1406                      flow && flow->internal;
1407                      flow = LIST_NEXT(flow, next)) {
1408                         const struct ibv_flow_spec_eth *eth =
1409                                 (const void *)((uintptr_t)flow->ibv_attr +
1410                                                sizeof(*flow->ibv_attr));
1411                         unsigned int j;
1412
1413                         if (!flow->mac)
1414                                 continue;
1415                         MLX4_ASSERT(flow->ibv_attr->type ==
1416                                     IBV_FLOW_ATTR_NORMAL);
1417                         MLX4_ASSERT(flow->ibv_attr->num_of_specs == 1);
1418                         MLX4_ASSERT(eth->type == IBV_FLOW_SPEC_ETH);
1419                         MLX4_ASSERT(flow->rss);
1420                         if (rule_vlan &&
1421                             (eth->val.vlan_tag != *rule_vlan ||
1422                              eth->mask.vlan_tag != RTE_BE16(0x0fff)))
1423                                 continue;
1424                         if (!rule_vlan && eth->mask.vlan_tag)
1425                                 continue;
1426                         for (j = 0; j != sizeof(mac->addr_bytes); ++j)
1427                                 if (eth->val.dst_mac[j] != mac->addr_bytes[j] ||
1428                                     eth->mask.dst_mac[j] != UINT8_C(0xff) ||
1429                                     eth->val.src_mac[j] != UINT8_C(0x00) ||
1430                                     eth->mask.src_mac[j] != UINT8_C(0x00))
1431                                         break;
1432                         if (j != sizeof(mac->addr_bytes))
1433                                 continue;
1434                         if (flow->rss->queues != queues ||
1435                             memcmp(flow->rss->queue_id, action_rss.queue,
1436                                    queues * sizeof(flow->rss->queue_id[0])))
1437                                 continue;
1438                         break;
1439                 }
1440                 if (!flow || !flow->internal) {
1441                         /* Not found, create a new flow rule. */
1442                         memcpy(rule_mac, mac, sizeof(*mac));
1443                         flow = mlx4_flow_create(ETH_DEV(priv), &attr, pattern,
1444                                                 actions, error);
1445                         if (!flow) {
1446                                 err = -rte_errno;
1447                                 goto error;
1448                         }
1449                 }
1450                 flow->select = 1;
1451                 flow->mac = 1;
1452         }
1453         if (rule_vlan) {
1454                 vlan = mlx4_flow_internal_next_vlan(priv, vlan + 1);
1455                 if (vlan < 4096)
1456                         goto next_vlan;
1457         }
1458         /* Take care of promiscuous and all multicast flow rules. */
1459         if (ETH_DEV(priv)->data->promiscuous ||
1460             ETH_DEV(priv)->data->all_multicast) {
1461                 for (flow = LIST_FIRST(&priv->flows);
1462                      flow && flow->internal;
1463                      flow = LIST_NEXT(flow, next)) {
1464                         if (ETH_DEV(priv)->data->promiscuous) {
1465                                 if (flow->promisc)
1466                                         break;
1467                         } else {
1468                                 MLX4_ASSERT(ETH_DEV(priv)->data->all_multicast);
1469                                 if (flow->allmulti)
1470                                         break;
1471                         }
1472                 }
1473                 if (flow && flow->internal) {
1474                         MLX4_ASSERT(flow->rss);
1475                         if (flow->rss->queues != queues ||
1476                             memcmp(flow->rss->queue_id, action_rss.queue,
1477                                    queues * sizeof(flow->rss->queue_id[0])))
1478                                 flow = NULL;
1479                 }
1480                 if (!flow || !flow->internal) {
1481                         /* Not found, create a new flow rule. */
1482                         if (ETH_DEV(priv)->data->promiscuous) {
1483                                 pattern[1].spec = NULL;
1484                                 pattern[1].mask = NULL;
1485                         } else {
1486                                 MLX4_ASSERT(ETH_DEV(priv)->data->all_multicast);
1487                                 pattern[1].spec = &eth_allmulti;
1488                                 pattern[1].mask = &eth_allmulti;
1489                         }
1490                         pattern[2] = pattern[3];
1491                         flow = mlx4_flow_create(ETH_DEV(priv), &attr, pattern,
1492                                                 actions, error);
1493                         if (!flow) {
1494                                 err = -rte_errno;
1495                                 goto error;
1496                         }
1497                 }
1498                 MLX4_ASSERT(flow->promisc || flow->allmulti);
1499                 flow->select = 1;
1500         }
1501 error:
1502         /* Clear selection and clean up stale internal flow rules. */
1503         flow = LIST_FIRST(&priv->flows);
1504         while (flow && flow->internal) {
1505                 struct rte_flow *next = LIST_NEXT(flow, next);
1506
1507                 if (!flow->select)
1508                         claim_zero(mlx4_flow_destroy(ETH_DEV(priv), flow,
1509                                                      error));
1510                 else
1511                         flow->select = 0;
1512                 flow = next;
1513         }
1514         return err;
1515 }
1516
1517 /**
1518  * Synchronize flow rules.
1519  *
1520  * This function synchronizes flow rules with the state of the device by
1521  * taking into account isolated mode and whether target queues are
1522  * configured.
1523  *
1524  * @param priv
1525  *   Pointer to private structure.
1526  * @param[out] error
1527  *   Perform verbose error reporting if not NULL.
1528  *
1529  * @return
1530  *   0 on success, a negative errno value otherwise and rte_errno is set.
1531  */
1532 int
1533 mlx4_flow_sync(struct mlx4_priv *priv, struct rte_flow_error *error)
1534 {
1535         struct rte_flow *flow;
1536         int ret;
1537
1538         /* Internal flow rules are guaranteed to come first in the list. */
1539         if (priv->isolated) {
1540                 /*
1541                  * Get rid of them in isolated mode, stop at the first
1542                  * non-internal rule found.
1543                  */
1544                 for (flow = LIST_FIRST(&priv->flows);
1545                      flow && flow->internal;
1546                      flow = LIST_FIRST(&priv->flows))
1547                         claim_zero(mlx4_flow_destroy(ETH_DEV(priv), flow,
1548                                                      error));
1549         } else {
1550                 /* Refresh internal rules. */
1551                 ret = mlx4_flow_internal(priv, error);
1552                 if (ret)
1553                         return ret;
1554         }
1555         /* Toggle the remaining flow rules . */
1556         LIST_FOREACH(flow, &priv->flows, next) {
1557                 ret = mlx4_flow_toggle(priv, flow, priv->started, error);
1558                 if (ret)
1559                         return ret;
1560         }
1561         if (!priv->started)
1562                 MLX4_ASSERT(!priv->drop);
1563         return 0;
1564 }
1565
1566 /**
1567  * Clean up all flow rules.
1568  *
1569  * Unlike mlx4_flow_flush(), this function takes care of all remaining flow
1570  * rules regardless of whether they are internal or user-configured.
1571  *
1572  * @param priv
1573  *   Pointer to private structure.
1574  */
1575 void
1576 mlx4_flow_clean(struct mlx4_priv *priv)
1577 {
1578         struct rte_flow *flow;
1579
1580         while ((flow = LIST_FIRST(&priv->flows)))
1581                 mlx4_flow_destroy(ETH_DEV(priv), flow, NULL);
1582         MLX4_ASSERT(LIST_EMPTY(&priv->rss));
1583 }
1584
1585 static const struct rte_flow_ops mlx4_flow_ops = {
1586         .validate = mlx4_flow_validate,
1587         .create = mlx4_flow_create,
1588         .destroy = mlx4_flow_destroy,
1589         .flush = mlx4_flow_flush,
1590         .isolate = mlx4_flow_isolate,
1591 };
1592
1593 /**
1594  * Get rte_flow callbacks.
1595  *
1596  * @param dev
1597  *   Pointer to Ethernet device structure.
1598  * @param ops
1599  *   Pointer to operation-specific structure.
1600  *
1601  * @return 0
1602  */
1603 int
1604 mlx4_flow_ops_get(struct rte_eth_dev *dev __rte_unused,
1605                   const struct rte_flow_ops **ops)
1606 {
1607         *ops = &mlx4_flow_ops;
1608         return 0;
1609 }