app/test-pmd/csumonly.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright 2014 6WIND S.A.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12
  13 #include <sys/queue.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_common.h>
  17 #include <rte_byteorder.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_memory.h>
  22 #include <rte_memcpy.h>
  23 #include <rte_launch.h>
  24 #include <rte_eal.h>
  25 #include <rte_per_lcore.h>
  26 #include <rte_lcore.h>
  27 #include <rte_atomic.h>
  28 #include <rte_branch_prediction.h>
  29 #include <rte_mempool.h>
  30 #include <rte_mbuf.h>
  31 #include <rte_interrupts.h>
  32 #include <rte_pci.h>
  33 #include <rte_ether.h>
  34 #include <rte_ethdev.h>
  35 #include <rte_ip.h>
  36 #include <rte_tcp.h>
  37 #include <rte_udp.h>
  38 #include <rte_sctp.h>
  39 #include <rte_prefetch.h>
  40 #include <rte_string_fns.h>
  41 #include <rte_flow.h>
  42 #include <rte_gro.h>
  43 #include <rte_gso.h>
  44
  45 #include "testpmd.h"
  46
  47 #define IP_DEFTTL  64   /* from RFC 1340. */
  48 #define IP_VERSION 0x40
  49 #define IP_HDRLEN  0x05 /* default IP header length == five 32-bits words. */
  50 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
  51
  52 #define GRE_CHECKSUM_PRESENT    0x8000
  53 #define GRE_KEY_PRESENT         0x2000
  54 #define GRE_SEQUENCE_PRESENT    0x1000
  55 #define GRE_EXT_LEN             4
  56 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  57                                  GRE_SEQUENCE_PRESENT)
  58
  59 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  60 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  61 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  62 #else
  63 #define _htons(x) (x)
  64 #endif
  65
  66 uint16_t vxlan_gpe_udp_port = 4790;
  67
  68 /* structure that caches offload info for the current packet */
  69 struct testpmd_offload_info {
  70         uint16_t ethertype;
  71         uint8_t gso_enable;
  72         uint16_t l2_len;
  73         uint16_t l3_len;
  74         uint16_t l4_len;
  75         uint8_t l4_proto;
  76         uint8_t is_tunnel;
  77         uint16_t outer_ethertype;
  78         uint16_t outer_l2_len;
  79         uint16_t outer_l3_len;
  80         uint8_t outer_l4_proto;
  81         uint16_t tso_segsz;
  82         uint16_t tunnel_tso_segsz;
  83         uint32_t pkt_len;
  84 };
  85
  86 /* simplified GRE header */
  87 struct simple_gre_hdr {
  88         uint16_t flags;
  89         uint16_t proto;
  90 } __attribute__((__packed__));
  91
  92 static uint16_t
  93 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  94 {
  95         if (ethertype == _htons(ETHER_TYPE_IPv4))
  96                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  97         else /* assume ethertype == ETHER_TYPE_IPv6 */
  98                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
  99 }
 100
 101 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 102 static void
 103 parse_ipv4(struct ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 104 {
 105         struct tcp_hdr *tcp_hdr;
 106
 107         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 108         info->l4_proto = ipv4_hdr->next_proto_id;
 109
 110         /* only fill l4_len for TCP, it's useful for TSO */
 111         if (info->l4_proto == IPPROTO_TCP) {
 112                 tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + info->l3_len);
 113                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 114         } else
 115                 info->l4_len = 0;
 116 }
 117
 118 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
 119 static void
 120 parse_ipv6(struct ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 121 {
 122         struct tcp_hdr *tcp_hdr;
 123
 124         info->l3_len = sizeof(struct ipv6_hdr);
 125         info->l4_proto = ipv6_hdr->proto;
 126
 127         /* only fill l4_len for TCP, it's useful for TSO */
 128         if (info->l4_proto == IPPROTO_TCP) {
 129                 tcp_hdr = (struct tcp_hdr *)((char *)ipv6_hdr + info->l3_len);
 130                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 131         } else
 132                 info->l4_len = 0;
 133 }
 134
 135 /*
 136  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 137  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
 138  * header. The l4_len argument is only set in case of TCP (useful for TSO).
 139  */
 140 static void
 141 parse_ethernet(struct ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 142 {
 143         struct ipv4_hdr *ipv4_hdr;
 144         struct ipv6_hdr *ipv6_hdr;
 145
 146         info->l2_len = sizeof(struct ether_hdr);
 147         info->ethertype = eth_hdr->ether_type;
 148
 149         if (info->ethertype == _htons(ETHER_TYPE_VLAN)) {
 150                 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
 151
 152                 info->l2_len  += sizeof(struct vlan_hdr);
 153                 info->ethertype = vlan_hdr->eth_proto;
 154         }
 155
 156         switch (info->ethertype) {
 157         case _htons(ETHER_TYPE_IPv4):
 158                 ipv4_hdr = (struct ipv4_hdr *) ((char *)eth_hdr + info->l2_len);
 159                 parse_ipv4(ipv4_hdr, info);
 160                 break;
 161         case _htons(ETHER_TYPE_IPv6):
 162                 ipv6_hdr = (struct ipv6_hdr *) ((char *)eth_hdr + info->l2_len);
 163                 parse_ipv6(ipv6_hdr, info);
 164                 break;
 165         default:
 166                 info->l4_len = 0;
 167                 info->l3_len = 0;
 168                 info->l4_proto = 0;
 169                 break;
 170         }
 171 }
 172
 173 /* Parse a vxlan header */
 174 static void
 175 parse_vxlan(struct udp_hdr *udp_hdr,
 176             struct testpmd_offload_info *info,
 177             uint32_t pkt_type)
 178 {
 179         struct ether_hdr *eth_hdr;
 180
 181         /* check udp destination port, 4789 is the default vxlan port
 182          * (rfc7348) or that the rx offload flag is set (i40e only
 183          * currently) */
 184         if (udp_hdr->dst_port != _htons(4789) &&
 185                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 186                 return;
 187
 188         info->is_tunnel = 1;
 189         info->outer_ethertype = info->ethertype;
 190         info->outer_l2_len = info->l2_len;
 191         info->outer_l3_len = info->l3_len;
 192         info->outer_l4_proto = info->l4_proto;
 193
 194         eth_hdr = (struct ether_hdr *)((char *)udp_hdr +
 195                 sizeof(struct udp_hdr) +
 196                 sizeof(struct vxlan_hdr));
 197
 198         parse_ethernet(eth_hdr, info);
 199         info->l2_len += ETHER_VXLAN_HLEN; /* add udp + vxlan */
 200 }
 201
 202 /* Parse a vxlan-gpe header */
 203 static void
 204 parse_vxlan_gpe(struct udp_hdr *udp_hdr,
 205             struct testpmd_offload_info *info)
 206 {
 207         struct ether_hdr *eth_hdr;
 208         struct ipv4_hdr *ipv4_hdr;
 209         struct ipv6_hdr *ipv6_hdr;
 210         struct vxlan_gpe_hdr *vxlan_gpe_hdr;
 211         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 212
 213         /* Check udp destination port. */
 214         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 215                 return;
 216
 217         vxlan_gpe_hdr = (struct vxlan_gpe_hdr *)((char *)udp_hdr +
 218                                 sizeof(struct udp_hdr));
 219
 220         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 221             VXLAN_GPE_TYPE_IPV4) {
 222                 info->is_tunnel = 1;
 223                 info->outer_ethertype = info->ethertype;
 224                 info->outer_l2_len = info->l2_len;
 225                 info->outer_l3_len = info->l3_len;
 226                 info->outer_l4_proto = info->l4_proto;
 227
 228                 ipv4_hdr = (struct ipv4_hdr *)((char *)vxlan_gpe_hdr +
 229                            vxlan_gpe_len);
 230
 231                 parse_ipv4(ipv4_hdr, info);
 232                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 233                 info->l2_len = 0;
 234
 235         } else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_IPV6) {
 236                 info->is_tunnel = 1;
 237                 info->outer_ethertype = info->ethertype;
 238                 info->outer_l2_len = info->l2_len;
 239                 info->outer_l3_len = info->l3_len;
 240                 info->outer_l4_proto = info->l4_proto;
 241
 242                 ipv6_hdr = (struct ipv6_hdr *)((char *)vxlan_gpe_hdr +
 243                            vxlan_gpe_len);
 244
 245                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 246                 parse_ipv6(ipv6_hdr, info);
 247                 info->l2_len = 0;
 248
 249         } else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_ETH) {
 250                 info->is_tunnel = 1;
 251                 info->outer_ethertype = info->ethertype;
 252                 info->outer_l2_len = info->l2_len;
 253                 info->outer_l3_len = info->l3_len;
 254                 info->outer_l4_proto = info->l4_proto;
 255
 256                 eth_hdr = (struct ether_hdr *)((char *)vxlan_gpe_hdr +
 257                           vxlan_gpe_len);
 258
 259                 parse_ethernet(eth_hdr, info);
 260         } else
 261                 return;
 262
 263         info->l2_len += ETHER_VXLAN_GPE_HLEN;
 264 }
 265
 266 /* Parse a gre header */
 267 static void
 268 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 269 {
 270         struct ether_hdr *eth_hdr;
 271         struct ipv4_hdr *ipv4_hdr;
 272         struct ipv6_hdr *ipv6_hdr;
 273         uint8_t gre_len = 0;
 274
 275         gre_len += sizeof(struct simple_gre_hdr);
 276
 277         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 278                 gre_len += GRE_EXT_LEN;
 279         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 280                 gre_len += GRE_EXT_LEN;
 281         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 282                 gre_len += GRE_EXT_LEN;
 283
 284         if (gre_hdr->proto == _htons(ETHER_TYPE_IPv4)) {
 285                 info->is_tunnel = 1;
 286                 info->outer_ethertype = info->ethertype;
 287                 info->outer_l2_len = info->l2_len;
 288                 info->outer_l3_len = info->l3_len;
 289                 info->outer_l4_proto = info->l4_proto;
 290
 291                 ipv4_hdr = (struct ipv4_hdr *)((char *)gre_hdr + gre_len);
 292
 293                 parse_ipv4(ipv4_hdr, info);
 294                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 295                 info->l2_len = 0;
 296
 297         } else if (gre_hdr->proto == _htons(ETHER_TYPE_IPv6)) {
 298                 info->is_tunnel = 1;
 299                 info->outer_ethertype = info->ethertype;
 300                 info->outer_l2_len = info->l2_len;
 301                 info->outer_l3_len = info->l3_len;
 302                 info->outer_l4_proto = info->l4_proto;
 303
 304                 ipv6_hdr = (struct ipv6_hdr *)((char *)gre_hdr + gre_len);
 305
 306                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 307                 parse_ipv6(ipv6_hdr, info);
 308                 info->l2_len = 0;
 309
 310         } else if (gre_hdr->proto == _htons(ETHER_TYPE_TEB)) {
 311                 info->is_tunnel = 1;
 312                 info->outer_ethertype = info->ethertype;
 313                 info->outer_l2_len = info->l2_len;
 314                 info->outer_l3_len = info->l3_len;
 315                 info->outer_l4_proto = info->l4_proto;
 316
 317                 eth_hdr = (struct ether_hdr *)((char *)gre_hdr + gre_len);
 318
 319                 parse_ethernet(eth_hdr, info);
 320         } else
 321                 return;
 322
 323         info->l2_len += gre_len;
 324 }
 325
 326
 327 /* Parse an encapsulated ip or ipv6 header */
 328 static void
 329 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 330 {
 331         struct ipv4_hdr *ipv4_hdr = encap_ip;
 332         struct ipv6_hdr *ipv6_hdr = encap_ip;
 333         uint8_t ip_version;
 334
 335         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 336
 337         if (ip_version != 4 && ip_version != 6)
 338                 return;
 339
 340         info->is_tunnel = 1;
 341         info->outer_ethertype = info->ethertype;
 342         info->outer_l2_len = info->l2_len;
 343         info->outer_l3_len = info->l3_len;
 344
 345         if (ip_version == 4) {
 346                 parse_ipv4(ipv4_hdr, info);
 347                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 348         } else {
 349                 parse_ipv6(ipv6_hdr, info);
 350                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 351         }
 352         info->l2_len = 0;
 353 }
 354
 355 /* if possible, calculate the checksum of a packet in hw or sw,
 356  * depending on the testpmd command line configuration */
 357 static uint64_t
 358 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 359         uint64_t tx_offloads)
 360 {
 361         struct ipv4_hdr *ipv4_hdr = l3_hdr;
 362         struct udp_hdr *udp_hdr;
 363         struct tcp_hdr *tcp_hdr;
 364         struct sctp_hdr *sctp_hdr;
 365         uint64_t ol_flags = 0;
 366         uint32_t max_pkt_len, tso_segsz = 0;
 367
 368         /* ensure packet is large enough to require tso */
 369         if (!info->is_tunnel) {
 370                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 371                         info->tso_segsz;
 372                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 373                         tso_segsz = info->tso_segsz;
 374         } else {
 375                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 376                         info->l2_len + info->l3_len + info->l4_len +
 377                         info->tunnel_tso_segsz;
 378                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 379                         tso_segsz = info->tunnel_tso_segsz;
 380         }
 381
 382         if (info->ethertype == _htons(ETHER_TYPE_IPv4)) {
 383                 ipv4_hdr = l3_hdr;
 384                 ipv4_hdr->hdr_checksum = 0;
 385
 386                 ol_flags |= PKT_TX_IPV4;
 387                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 388                         ol_flags |= PKT_TX_IP_CKSUM;
 389                 } else {
 390                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 391                                 ol_flags |= PKT_TX_IP_CKSUM;
 392                         else
 393                                 ipv4_hdr->hdr_checksum =
 394                                         rte_ipv4_cksum(ipv4_hdr);
 395                 }
 396         } else if (info->ethertype == _htons(ETHER_TYPE_IPv6))
 397                 ol_flags |= PKT_TX_IPV6;
 398         else
 399                 return 0; /* packet type not supported, nothing to do */
 400
 401         if (info->l4_proto == IPPROTO_UDP) {
 402                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
 403                 /* do not recalculate udp cksum if it was 0 */
 404                 if (udp_hdr->dgram_cksum != 0) {
 405                         udp_hdr->dgram_cksum = 0;
 406                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 407                                 ol_flags |= PKT_TX_UDP_CKSUM;
 408                         else {
 409                                 udp_hdr->dgram_cksum =
 410                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 411                                                 info->ethertype);
 412                         }
 413                 }
 414                 if (info->gso_enable)
 415                         ol_flags |= PKT_TX_UDP_SEG;
 416         } else if (info->l4_proto == IPPROTO_TCP) {
 417                 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
 418                 tcp_hdr->cksum = 0;
 419                 if (tso_segsz)
 420                         ol_flags |= PKT_TX_TCP_SEG;
 421                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 422                         ol_flags |= PKT_TX_TCP_CKSUM;
 423                 else {
 424                         tcp_hdr->cksum =
 425                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 426                                         info->ethertype);
 427                 }
 428                 if (info->gso_enable)
 429                         ol_flags |= PKT_TX_TCP_SEG;
 430         } else if (info->l4_proto == IPPROTO_SCTP) {
 431                 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
 432                 sctp_hdr->cksum = 0;
 433                 /* sctp payload must be a multiple of 4 to be
 434                  * offloaded */
 435                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 436                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 437                         ol_flags |= PKT_TX_SCTP_CKSUM;
 438                 } else {
 439                         /* XXX implement CRC32c, example available in
 440                          * RFC3309 */
 441                 }
 442         }
 443
 444         return ol_flags;
 445 }
 446
 447 /* Calculate the checksum of outer header */
 448 static uint64_t
 449 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 450         uint64_t tx_offloads, int tso_enabled)
 451 {
 452         struct ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 453         struct ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 454         struct udp_hdr *udp_hdr;
 455         uint64_t ol_flags = 0;
 456
 457         if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4)) {
 458                 ipv4_hdr->hdr_checksum = 0;
 459                 ol_flags |= PKT_TX_OUTER_IPV4;
 460
 461                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 462                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 463                 else
 464                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 465         } else
 466                 ol_flags |= PKT_TX_OUTER_IPV6;
 467
 468         if (info->outer_l4_proto != IPPROTO_UDP)
 469                 return ol_flags;
 470
 471         /* Skip SW outer UDP checksum generation if HW supports it */
 472         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 473                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 474                 return ol_flags;
 475         }
 476
 477         udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + info->outer_l3_len);
 478
 479         /* outer UDP checksum is done in software. In the other side, for
 480          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 481          * set to zero.
 482          *
 483          * If a packet will be TSOed into small packets by NIC, we cannot
 484          * set/calculate a non-zero checksum, because it will be a wrong
 485          * value after the packet be split into several small packets.
 486          */
 487         if (tso_enabled)
 488                 udp_hdr->dgram_cksum = 0;
 489
 490         /* do not recalculate udp cksum if it was 0 */
 491         if (udp_hdr->dgram_cksum != 0) {
 492                 udp_hdr->dgram_cksum = 0;
 493                 if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4))
 494                         udp_hdr->dgram_cksum =
 495                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 496                 else
 497                         udp_hdr->dgram_cksum =
 498                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 499         }
 500
 501         return ol_flags;
 502 }
 503
 504 /*
 505  * Helper function.
 506  * Performs actual copying.
 507  * Returns number of segments in the destination mbuf on success,
 508  * or negative error code on failure.
 509  */
 510 static int
 511 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 512         uint16_t seglen[], uint8_t nb_seg)
 513 {
 514         uint32_t dlen, slen, tlen;
 515         uint32_t i, len;
 516         const struct rte_mbuf *m;
 517         const uint8_t *src;
 518         uint8_t *dst;
 519
 520         dlen = 0;
 521         slen = 0;
 522         tlen = 0;
 523
 524         dst = NULL;
 525         src = NULL;
 526
 527         m = ms;
 528         i = 0;
 529         while (ms != NULL && i != nb_seg) {
 530
 531                 if (slen == 0) {
 532                         slen = rte_pktmbuf_data_len(ms);
 533                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 534                 }
 535
 536                 if (dlen == 0) {
 537                         dlen = RTE_MIN(seglen[i], slen);
 538                         md[i]->data_len = dlen;
 539                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 540                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 541                 }
 542
 543                 len = RTE_MIN(slen, dlen);
 544                 memcpy(dst, src, len);
 545                 tlen += len;
 546                 slen -= len;
 547                 dlen -= len;
 548                 src += len;
 549                 dst += len;
 550
 551                 if (slen == 0)
 552                         ms = ms->next;
 553                 if (dlen == 0)
 554                         i++;
 555         }
 556
 557         if (ms != NULL)
 558                 return -ENOBUFS;
 559         else if (tlen != m->pkt_len)
 560                 return -EINVAL;
 561
 562         md[0]->nb_segs = nb_seg;
 563         md[0]->pkt_len = tlen;
 564         md[0]->vlan_tci = m->vlan_tci;
 565         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 566         md[0]->ol_flags = m->ol_flags;
 567         md[0]->tx_offload = m->tx_offload;
 568
 569         return nb_seg;
 570 }
 571
 572 /*
 573  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 574  * Copy packet contents and offload information into then new segmented mbuf.
 575  */
 576 static struct rte_mbuf *
 577 pkt_copy_split(const struct rte_mbuf *pkt)
 578 {
 579         int32_t n, rc;
 580         uint32_t i, len, nb_seg;
 581         struct rte_mempool *mp;
 582         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 583         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 584
 585         mp = current_fwd_lcore()->mbp;
 586
 587         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 588                 nb_seg = random() % tx_pkt_nb_segs + 1;
 589         else
 590                 nb_seg = tx_pkt_nb_segs;
 591
 592         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 593
 594         /* calculate number of segments to use and their length. */
 595         len = 0;
 596         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 597                 len += seglen[i];
 598                 md[i] = NULL;
 599         }
 600
 601         n = pkt->pkt_len - len;
 602
 603         /* update size of the last segment to fit rest of the packet */
 604         if (n >= 0) {
 605                 seglen[i - 1] += n;
 606                 len += n;
 607         }
 608
 609         nb_seg = i;
 610         while (i != 0) {
 611                 p = rte_pktmbuf_alloc(mp);
 612                 if (p == NULL) {
 613                         TESTPMD_LOG(ERR,
 614                                 "failed to allocate %u-th of %u mbuf "
 615                                 "from mempool: %s\n",
 616                                 nb_seg - i, nb_seg, mp->name);
 617                         break;
 618                 }
 619
 620                 md[--i] = p;
 621                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 622                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 623                                 "expected seglen: %u, "
 624                                 "actual mbuf tailroom: %u\n",
 625                                 mp->name, i, seglen[i],
 626                                 rte_pktmbuf_tailroom(md[i]));
 627                         break;
 628                 }
 629         }
 630
 631         /* all mbufs successfully allocated, do copy */
 632         if (i == 0) {
 633                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 634                 if (rc < 0)
 635                         TESTPMD_LOG(ERR,
 636                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 637                                 "into %u segments failed with error code: %d\n",
 638                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 639
 640                 /* figure out how many mbufs to free. */
 641                 i = RTE_MAX(rc, 0);
 642         }
 643
 644         /* free unused mbufs */
 645         for (; i != nb_seg; i++) {
 646                 rte_pktmbuf_free_seg(md[i]);
 647                 md[i] = NULL;
 648         }
 649
 650         return md[0];
 651 }
 652
 653 /*
 654  * Receive a burst of packets, and for each packet:
 655  *  - parse packet, and try to recognize a supported packet type (1)
 656  *  - if it's not a supported packet type, don't touch the packet, else:
 657  *  - reprocess the checksum of all supported layers. This is done in SW
 658  *    or HW, depending on testpmd command line configuration
 659  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 660  *    segmentation offload (this implies HW TCP checksum)
 661  * Then transmit packets on the output port.
 662  *
 663  * (1) Supported packets are:
 664  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 665  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 666  *           UDP|TCP|SCTP
 667  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 668  *           UDP|TCP|SCTP
 669  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 670  *           UDP|TCP|SCTP
 671  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 672  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 673  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 674  *
 675  * The testpmd command line for this forward engine sets the flags
 676  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 677  * wether a checksum must be calculated in software or in hardware. The
 678  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 679  * OUTER_IP is only useful for tunnel packets.
 680  */
 681 static void
 682 pkt_burst_checksum_forward(struct fwd_stream *fs)
 683 {
 684         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 685         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 686         struct rte_gso_ctx *gso_ctx;
 687         struct rte_mbuf **tx_pkts_burst;
 688         struct rte_port *txp;
 689         struct rte_mbuf *m, *p;
 690         struct ether_hdr *eth_hdr;
 691         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 692         void **gro_ctx;
 693         uint16_t gro_pkts_num;
 694         uint8_t gro_enable;
 695         uint16_t nb_rx;
 696         uint16_t nb_tx;
 697         uint16_t nb_prep;
 698         uint16_t i;
 699         uint64_t rx_ol_flags, tx_ol_flags;
 700         uint64_t tx_offloads;
 701         uint32_t retry;
 702         uint32_t rx_bad_ip_csum;
 703         uint32_t rx_bad_l4_csum;
 704         uint32_t rx_bad_outer_l4_csum;
 705         struct testpmd_offload_info info;
 706         uint16_t nb_segments = 0;
 707         int ret;
 708
 709 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 710         uint64_t start_tsc;
 711         uint64_t end_tsc;
 712         uint64_t core_cycles;
 713 #endif
 714
 715 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 716         start_tsc = rte_rdtsc();
 717 #endif
 718
 719         /* receive a burst of packet */
 720         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 721                                  nb_pkt_per_burst);
 722         if (unlikely(nb_rx == 0))
 723                 return;
 724 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 725         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 726 #endif
 727         fs->rx_packets += nb_rx;
 728         rx_bad_ip_csum = 0;
 729         rx_bad_l4_csum = 0;
 730         rx_bad_outer_l4_csum = 0;
 731         gro_enable = gro_ports[fs->rx_port].enable;
 732
 733         txp = &ports[fs->tx_port];
 734         tx_offloads = txp->dev_conf.txmode.offloads;
 735         memset(&info, 0, sizeof(info));
 736         info.tso_segsz = txp->tso_segsz;
 737         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 738         if (gso_ports[fs->tx_port].enable)
 739                 info.gso_enable = 1;
 740
 741         for (i = 0; i < nb_rx; i++) {
 742                 if (likely(i < nb_rx - 1))
 743                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 744                                                        void *));
 745
 746                 m = pkts_burst[i];
 747                 info.is_tunnel = 0;
 748                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 749                 tx_ol_flags = m->ol_flags &
 750                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 751                 rx_ol_flags = m->ol_flags;
 752
 753                 /* Update the L3/L4 checksum error packet statistics */
 754                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 755                         rx_bad_ip_csum += 1;
 756                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 757                         rx_bad_l4_csum += 1;
 758                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 759                         rx_bad_outer_l4_csum += 1;
 760
 761                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 762                  * and inner headers */
 763
 764                 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
 765                 ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 766                                 &eth_hdr->d_addr);
 767                 ether_addr_copy(&ports[fs->tx_port].eth_addr,
 768                                 &eth_hdr->s_addr);
 769                 parse_ethernet(eth_hdr, &info);
 770                 l3_hdr = (char *)eth_hdr + info.l2_len;
 771
 772                 /* check if it's a supported tunnel */
 773                 if (txp->parse_tunnel) {
 774                         if (info.l4_proto == IPPROTO_UDP) {
 775                                 struct udp_hdr *udp_hdr;
 776
 777                                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
 778                                         info.l3_len);
 779                                 parse_vxlan_gpe(udp_hdr, &info);
 780                                 if (info.is_tunnel) {
 781                                         tx_ol_flags |= PKT_TX_TUNNEL_VXLAN_GPE;
 782                                 } else {
 783                                         parse_vxlan(udp_hdr, &info,
 784                                                     m->packet_type);
 785                                         if (info.is_tunnel)
 786                                                 tx_ol_flags |=
 787                                                         PKT_TX_TUNNEL_VXLAN;
 788                                 }
 789                         } else if (info.l4_proto == IPPROTO_GRE) {
 790                                 struct simple_gre_hdr *gre_hdr;
 791
 792                                 gre_hdr = (struct simple_gre_hdr *)
 793                                         ((char *)l3_hdr + info.l3_len);
 794                                 parse_gre(gre_hdr, &info);
 795                                 if (info.is_tunnel)
 796                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 797                         } else if (info.l4_proto == IPPROTO_IPIP) {
 798                                 void *encap_ip_hdr;
 799
 800                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 801                                 parse_encap_ip(encap_ip_hdr, &info);
 802                                 if (info.is_tunnel)
 803                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 804                         }
 805                 }
 806
 807                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 808                 if (info.is_tunnel) {
 809                         outer_l3_hdr = l3_hdr;
 810                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 811                 }
 812
 813                 /* step 2: depending on user command line configuration,
 814                  * recompute checksum either in software or flag the
 815                  * mbuf to offload the calculation to the NIC. If TSO
 816                  * is configured, prepare the mbuf for TCP segmentation. */
 817
 818                 /* process checksums of inner headers first */
 819                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 820                         tx_offloads);
 821
 822                 /* Then process outer headers if any. Note that the software
 823                  * checksum will be wrong if one of the inner checksums is
 824                  * processed in hardware. */
 825                 if (info.is_tunnel == 1) {
 826                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 827                                         tx_offloads,
 828                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 829                 }
 830
 831                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 832
 833                 m->tx_offload = 0;
 834                 if (info.is_tunnel == 1) {
 835                         if (info.tunnel_tso_segsz ||
 836                             (tx_offloads &
 837                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 838                             (tx_offloads &
 839                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 840                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 841                                 m->outer_l2_len = info.outer_l2_len;
 842                                 m->outer_l3_len = info.outer_l3_len;
 843                                 m->l2_len = info.l2_len;
 844                                 m->l3_len = info.l3_len;
 845                                 m->l4_len = info.l4_len;
 846                                 m->tso_segsz = info.tunnel_tso_segsz;
 847                         }
 848                         else {
 849                                 /* if there is a outer UDP cksum
 850                                    processed in sw and the inner in hw,
 851                                    the outer checksum will be wrong as
 852                                    the payload will be modified by the
 853                                    hardware */
 854                                 m->l2_len = info.outer_l2_len +
 855                                         info.outer_l3_len + info.l2_len;
 856                                 m->l3_len = info.l3_len;
 857                                 m->l4_len = info.l4_len;
 858                         }
 859                 } else {
 860                         /* this is only useful if an offload flag is
 861                          * set, but it does not hurt to fill it in any
 862                          * case */
 863                         m->l2_len = info.l2_len;
 864                         m->l3_len = info.l3_len;
 865                         m->l4_len = info.l4_len;
 866                         m->tso_segsz = info.tso_segsz;
 867                 }
 868                 m->ol_flags = tx_ol_flags;
 869
 870                 /* Do split & copy for the packet. */
 871                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 872                         p = pkt_copy_split(m);
 873                         if (p != NULL) {
 874                                 rte_pktmbuf_free(m);
 875                                 m = p;
 876                                 pkts_burst[i] = m;
 877                         }
 878                 }
 879
 880                 /* if verbose mode is enabled, dump debug info */
 881                 if (verbose_level > 0) {
 882                         char buf[256];
 883
 884                         printf("-----------------\n");
 885                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 886                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 887                         /* dump rx parsed packet info */
 888                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 889                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 890                                 "l4_proto=%d l4_len=%d flags=%s\n",
 891                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 892                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 893                         if (rx_ol_flags & PKT_RX_LRO)
 894                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 895                         if (info.is_tunnel == 1)
 896                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 897                                         "outer_l3_len=%d\n", info.outer_l2_len,
 898                                         rte_be_to_cpu_16(info.outer_ethertype),
 899                                         info.outer_l3_len);
 900                         /* dump tx packet info */
 901                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 902                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 903                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 904                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 905                                 info.tso_segsz != 0)
 906                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 907                                         "m->l4_len=%d\n",
 908                                         m->l2_len, m->l3_len, m->l4_len);
 909                         if (info.is_tunnel == 1) {
 910                                 if ((tx_offloads &
 911                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 912                                     (tx_offloads &
 913                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 914                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
 915                                         printf("tx: m->outer_l2_len=%d "
 916                                                 "m->outer_l3_len=%d\n",
 917                                                 m->outer_l2_len,
 918                                                 m->outer_l3_len);
 919                                 if (info.tunnel_tso_segsz != 0 &&
 920                                                 (m->ol_flags & PKT_TX_TCP_SEG))
 921                                         printf("tx: m->tso_segsz=%d\n",
 922                                                 m->tso_segsz);
 923                         } else if (info.tso_segsz != 0 &&
 924                                         (m->ol_flags & PKT_TX_TCP_SEG))
 925                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
 926                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
 927                         printf("tx: flags=%s", buf);
 928                         printf("\n");
 929                 }
 930         }
 931
 932         if (unlikely(gro_enable)) {
 933                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
 934                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
 935                                         &(gro_ports[fs->rx_port].param));
 936                 } else {
 937                         gro_ctx = current_fwd_lcore()->gro_ctx;
 938                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
 939
 940                         if (++fs->gro_times >= gro_flush_cycles) {
 941                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
 942                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
 943                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
 944
 945                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
 946                                                 RTE_GRO_TCP_IPV4,
 947                                                 &pkts_burst[nb_rx],
 948                                                 gro_pkts_num);
 949                                 fs->gro_times = 0;
 950                         }
 951                 }
 952         }
 953
 954         if (gso_ports[fs->tx_port].enable == 0)
 955                 tx_pkts_burst = pkts_burst;
 956         else {
 957                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
 958                 gso_ctx->gso_size = gso_max_segment_size;
 959                 for (i = 0; i < nb_rx; i++) {
 960                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
 961                                         &gso_segments[nb_segments],
 962                                         GSO_MAX_PKT_BURST - nb_segments);
 963                         if (ret >= 0)
 964                                 nb_segments += ret;
 965                         else {
 966                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
 967                                 rte_pktmbuf_free(pkts_burst[i]);
 968                         }
 969                 }
 970
 971                 tx_pkts_burst = gso_segments;
 972                 nb_rx = nb_segments;
 973         }
 974
 975         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
 976                         tx_pkts_burst, nb_rx);
 977         if (nb_prep != nb_rx)
 978                 printf("Preparing packet burst to transmit failed: %s\n",
 979                                 rte_strerror(rte_errno));
 980
 981         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
 982                         nb_prep);
 983
 984         /*
 985          * Retry if necessary
 986          */
 987         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
 988                 retry = 0;
 989                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
 990                         rte_delay_us(burst_tx_delay_time);
 991                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 992                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
 993                 }
 994         }
 995         fs->tx_packets += nb_tx;
 996         fs->rx_bad_ip_csum += rx_bad_ip_csum;
 997         fs->rx_bad_l4_csum += rx_bad_l4_csum;
 998         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
 999
1000 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1001         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1002 #endif
1003         if (unlikely(nb_tx < nb_rx)) {
1004                 fs->fwd_dropped += (nb_rx - nb_tx);
1005                 do {
1006                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1007                 } while (++nb_tx < nb_rx);
1008         }
1009
1010 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1011         end_tsc = rte_rdtsc();
1012         core_cycles = (end_tsc - start_tsc);
1013         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1014 #endif
1015 }
1016
1017 struct fwd_engine csum_fwd_engine = {
1018         .fwd_mode_name  = "csum",
1019         .port_fwd_begin = NULL,
1020         .port_fwd_end   = NULL,
1021         .packet_fwd     = pkt_burst_checksum_forward,
1022 };