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_gtp.h>
  40 #include <rte_prefetch.h>
  41 #include <rte_string_fns.h>
  42 #include <rte_flow.h>
  43 #include <rte_gro.h>
  44 #include <rte_gso.h>
  45
  46 #include "testpmd.h"
  47
  48 #define IP_DEFTTL  64   /* from RFC 1340. */
  49 #define IP_VERSION 0x40
  50 #define IP_HDRLEN  0x05 /* default IP header length == five 32-bits words. */
  51 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
  52
  53 #define GRE_CHECKSUM_PRESENT    0x8000
  54 #define GRE_KEY_PRESENT         0x2000
  55 #define GRE_SEQUENCE_PRESENT    0x1000
  56 #define GRE_EXT_LEN             4
  57 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  58                                  GRE_SEQUENCE_PRESENT)
  59
  60 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  61 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  62 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  63 #else
  64 #define _htons(x) (x)
  65 #endif
  66
  67 uint16_t vxlan_gpe_udp_port = 4790;
  68
  69 /* structure that caches offload info for the current packet */
  70 struct testpmd_offload_info {
  71         uint16_t ethertype;
  72         uint8_t gso_enable;
  73         uint16_t l2_len;
  74         uint16_t l3_len;
  75         uint16_t l4_len;
  76         uint8_t l4_proto;
  77         uint8_t is_tunnel;
  78         uint16_t outer_ethertype;
  79         uint16_t outer_l2_len;
  80         uint16_t outer_l3_len;
  81         uint8_t outer_l4_proto;
  82         uint16_t tso_segsz;
  83         uint16_t tunnel_tso_segsz;
  84         uint32_t pkt_len;
  85 };
  86
  87 /* simplified GRE header */
  88 struct simple_gre_hdr {
  89         uint16_t flags;
  90         uint16_t proto;
  91 } __attribute__((__packed__));
  92
  93 static uint16_t
  94 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  95 {
  96         if (ethertype == _htons(RTE_ETHER_TYPE_IPV4))
  97                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  98         else /* assume ethertype == RTE_ETHER_TYPE_IPV6 */
  99                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
 100 }
 101
 102 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 103 static void
 104 parse_ipv4(struct rte_ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 105 {
 106         struct rte_tcp_hdr *tcp_hdr;
 107
 108         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 109         info->l4_proto = ipv4_hdr->next_proto_id;
 110
 111         /* only fill l4_len for TCP, it's useful for TSO */
 112         if (info->l4_proto == IPPROTO_TCP) {
 113                 tcp_hdr = (struct rte_tcp_hdr *)
 114                         ((char *)ipv4_hdr + info->l3_len);
 115                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 116         } else if (info->l4_proto == IPPROTO_UDP)
 117                 info->l4_len = sizeof(struct rte_udp_hdr);
 118         else
 119                 info->l4_len = 0;
 120 }
 121
 122 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
 123 static void
 124 parse_ipv6(struct rte_ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 125 {
 126         struct rte_tcp_hdr *tcp_hdr;
 127
 128         info->l3_len = sizeof(struct rte_ipv6_hdr);
 129         info->l4_proto = ipv6_hdr->proto;
 130
 131         /* only fill l4_len for TCP, it's useful for TSO */
 132         if (info->l4_proto == IPPROTO_TCP) {
 133                 tcp_hdr = (struct rte_tcp_hdr *)
 134                         ((char *)ipv6_hdr + info->l3_len);
 135                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 136         } else if (info->l4_proto == IPPROTO_UDP)
 137                 info->l4_len = sizeof(struct rte_udp_hdr);
 138         else
 139                 info->l4_len = 0;
 140 }
 141
 142 /*
 143  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 144  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
 145  * header. The l4_len argument is only set in case of TCP (useful for TSO).
 146  */
 147 static void
 148 parse_ethernet(struct rte_ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 149 {
 150         struct rte_ipv4_hdr *ipv4_hdr;
 151         struct rte_ipv6_hdr *ipv6_hdr;
 152
 153         info->l2_len = sizeof(struct rte_ether_hdr);
 154         info->ethertype = eth_hdr->ether_type;
 155
 156         if (info->ethertype == _htons(RTE_ETHER_TYPE_VLAN)) {
 157                 struct rte_vlan_hdr *vlan_hdr = (
 158                         struct rte_vlan_hdr *)(eth_hdr + 1);
 159
 160                 info->l2_len  += sizeof(struct rte_vlan_hdr);
 161                 info->ethertype = vlan_hdr->eth_proto;
 162         }
 163
 164         switch (info->ethertype) {
 165         case _htons(RTE_ETHER_TYPE_IPV4):
 166                 ipv4_hdr = (struct rte_ipv4_hdr *)
 167                         ((char *)eth_hdr + info->l2_len);
 168                 parse_ipv4(ipv4_hdr, info);
 169                 break;
 170         case _htons(RTE_ETHER_TYPE_IPV6):
 171                 ipv6_hdr = (struct rte_ipv6_hdr *)
 172                         ((char *)eth_hdr + info->l2_len);
 173                 parse_ipv6(ipv6_hdr, info);
 174                 break;
 175         default:
 176                 info->l4_len = 0;
 177                 info->l3_len = 0;
 178                 info->l4_proto = 0;
 179                 break;
 180         }
 181 }
 182
 183 /*
 184  * Parse a GTP protocol header.
 185  * No optional fields and next extension header type.
 186  */
 187 static void
 188 parse_gtp(struct rte_udp_hdr *udp_hdr,
 189           struct testpmd_offload_info *info)
 190 {
 191         struct rte_ipv4_hdr *ipv4_hdr;
 192         struct rte_ipv6_hdr *ipv6_hdr;
 193         struct rte_gtp_hdr *gtp_hdr;
 194         uint8_t gtp_len = sizeof(*gtp_hdr);
 195         uint8_t ip_ver;
 196
 197         /* Check udp destination port. */
 198         if (udp_hdr->dst_port != _htons(RTE_GTPC_UDP_PORT) &&
 199             udp_hdr->src_port != _htons(RTE_GTPC_UDP_PORT) &&
 200             udp_hdr->dst_port != _htons(RTE_GTPU_UDP_PORT))
 201                 return;
 202
 203         info->is_tunnel = 1;
 204         info->outer_ethertype = info->ethertype;
 205         info->outer_l2_len = info->l2_len;
 206         info->outer_l3_len = info->l3_len;
 207         info->outer_l4_proto = info->l4_proto;
 208         info->l2_len = 0;
 209
 210         gtp_hdr = (struct rte_gtp_hdr *)((char *)udp_hdr +
 211                   sizeof(struct rte_udp_hdr));
 212
 213         /*
 214          * Check message type. If message type is 0xff, it is
 215          * a GTP data packet. If not, it is a GTP control packet
 216          */
 217         if (gtp_hdr->msg_type == 0xff) {
 218                 ip_ver = *(uint8_t *)((char *)udp_hdr +
 219                          sizeof(struct rte_udp_hdr) +
 220                          sizeof(struct rte_gtp_hdr));
 221                 ip_ver = (ip_ver) & 0xf0;
 222
 223                 if (ip_ver == RTE_GTP_TYPE_IPV4) {
 224                         ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gtp_hdr +
 225                                    gtp_len);
 226                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 227                         parse_ipv4(ipv4_hdr, info);
 228                 } else if (ip_ver == RTE_GTP_TYPE_IPV6) {
 229                         ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gtp_hdr +
 230                                    gtp_len);
 231                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 232                         parse_ipv6(ipv6_hdr, info);
 233                 }
 234         } else {
 235                 info->ethertype = 0;
 236                 info->l4_len = 0;
 237                 info->l3_len = 0;
 238                 info->l4_proto = 0;
 239         }
 240
 241         info->l2_len += RTE_ETHER_GTP_HLEN;
 242 }
 243
 244 /* Parse a vxlan header */
 245 static void
 246 parse_vxlan(struct rte_udp_hdr *udp_hdr,
 247             struct testpmd_offload_info *info,
 248             uint32_t pkt_type)
 249 {
 250         struct rte_ether_hdr *eth_hdr;
 251
 252         /* check udp destination port, 4789 is the default vxlan port
 253          * (rfc7348) or that the rx offload flag is set (i40e only
 254          * currently) */
 255         if (udp_hdr->dst_port != _htons(4789) &&
 256                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 257                 return;
 258
 259         info->is_tunnel = 1;
 260         info->outer_ethertype = info->ethertype;
 261         info->outer_l2_len = info->l2_len;
 262         info->outer_l3_len = info->l3_len;
 263         info->outer_l4_proto = info->l4_proto;
 264
 265         eth_hdr = (struct rte_ether_hdr *)((char *)udp_hdr +
 266                 sizeof(struct rte_udp_hdr) +
 267                 sizeof(struct rte_vxlan_hdr));
 268
 269         parse_ethernet(eth_hdr, info);
 270         info->l2_len += RTE_ETHER_VXLAN_HLEN; /* add udp + vxlan */
 271 }
 272
 273 /* Parse a vxlan-gpe header */
 274 static void
 275 parse_vxlan_gpe(struct rte_udp_hdr *udp_hdr,
 276             struct testpmd_offload_info *info)
 277 {
 278         struct rte_ether_hdr *eth_hdr;
 279         struct rte_ipv4_hdr *ipv4_hdr;
 280         struct rte_ipv6_hdr *ipv6_hdr;
 281         struct rte_vxlan_gpe_hdr *vxlan_gpe_hdr;
 282         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 283
 284         /* Check udp destination port. */
 285         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 286                 return;
 287
 288         vxlan_gpe_hdr = (struct rte_vxlan_gpe_hdr *)((char *)udp_hdr +
 289                                 sizeof(struct rte_udp_hdr));
 290
 291         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 292             RTE_VXLAN_GPE_TYPE_IPV4) {
 293                 info->is_tunnel = 1;
 294                 info->outer_ethertype = info->ethertype;
 295                 info->outer_l2_len = info->l2_len;
 296                 info->outer_l3_len = info->l3_len;
 297                 info->outer_l4_proto = info->l4_proto;
 298
 299                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)vxlan_gpe_hdr +
 300                            vxlan_gpe_len);
 301
 302                 parse_ipv4(ipv4_hdr, info);
 303                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 304                 info->l2_len = 0;
 305
 306         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_IPV6) {
 307                 info->is_tunnel = 1;
 308                 info->outer_ethertype = info->ethertype;
 309                 info->outer_l2_len = info->l2_len;
 310                 info->outer_l3_len = info->l3_len;
 311                 info->outer_l4_proto = info->l4_proto;
 312
 313                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)vxlan_gpe_hdr +
 314                            vxlan_gpe_len);
 315
 316                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 317                 parse_ipv6(ipv6_hdr, info);
 318                 info->l2_len = 0;
 319
 320         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_ETH) {
 321                 info->is_tunnel = 1;
 322                 info->outer_ethertype = info->ethertype;
 323                 info->outer_l2_len = info->l2_len;
 324                 info->outer_l3_len = info->l3_len;
 325                 info->outer_l4_proto = info->l4_proto;
 326
 327                 eth_hdr = (struct rte_ether_hdr *)((char *)vxlan_gpe_hdr +
 328                           vxlan_gpe_len);
 329
 330                 parse_ethernet(eth_hdr, info);
 331         } else
 332                 return;
 333
 334         info->l2_len += RTE_ETHER_VXLAN_GPE_HLEN;
 335 }
 336
 337 /* Parse a gre header */
 338 static void
 339 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 340 {
 341         struct rte_ether_hdr *eth_hdr;
 342         struct rte_ipv4_hdr *ipv4_hdr;
 343         struct rte_ipv6_hdr *ipv6_hdr;
 344         uint8_t gre_len = 0;
 345
 346         gre_len += sizeof(struct simple_gre_hdr);
 347
 348         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 349                 gre_len += GRE_EXT_LEN;
 350         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 351                 gre_len += GRE_EXT_LEN;
 352         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 353                 gre_len += GRE_EXT_LEN;
 354
 355         if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV4)) {
 356                 info->is_tunnel = 1;
 357                 info->outer_ethertype = info->ethertype;
 358                 info->outer_l2_len = info->l2_len;
 359                 info->outer_l3_len = info->l3_len;
 360                 info->outer_l4_proto = info->l4_proto;
 361
 362                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gre_hdr + gre_len);
 363
 364                 parse_ipv4(ipv4_hdr, info);
 365                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 366                 info->l2_len = 0;
 367
 368         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV6)) {
 369                 info->is_tunnel = 1;
 370                 info->outer_ethertype = info->ethertype;
 371                 info->outer_l2_len = info->l2_len;
 372                 info->outer_l3_len = info->l3_len;
 373                 info->outer_l4_proto = info->l4_proto;
 374
 375                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gre_hdr + gre_len);
 376
 377                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 378                 parse_ipv6(ipv6_hdr, info);
 379                 info->l2_len = 0;
 380
 381         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_TEB)) {
 382                 info->is_tunnel = 1;
 383                 info->outer_ethertype = info->ethertype;
 384                 info->outer_l2_len = info->l2_len;
 385                 info->outer_l3_len = info->l3_len;
 386                 info->outer_l4_proto = info->l4_proto;
 387
 388                 eth_hdr = (struct rte_ether_hdr *)((char *)gre_hdr + gre_len);
 389
 390                 parse_ethernet(eth_hdr, info);
 391         } else
 392                 return;
 393
 394         info->l2_len += gre_len;
 395 }
 396
 397
 398 /* Parse an encapsulated ip or ipv6 header */
 399 static void
 400 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 401 {
 402         struct rte_ipv4_hdr *ipv4_hdr = encap_ip;
 403         struct rte_ipv6_hdr *ipv6_hdr = encap_ip;
 404         uint8_t ip_version;
 405
 406         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 407
 408         if (ip_version != 4 && ip_version != 6)
 409                 return;
 410
 411         info->is_tunnel = 1;
 412         info->outer_ethertype = info->ethertype;
 413         info->outer_l2_len = info->l2_len;
 414         info->outer_l3_len = info->l3_len;
 415
 416         if (ip_version == 4) {
 417                 parse_ipv4(ipv4_hdr, info);
 418                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 419         } else {
 420                 parse_ipv6(ipv6_hdr, info);
 421                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 422         }
 423         info->l2_len = 0;
 424 }
 425
 426 /* if possible, calculate the checksum of a packet in hw or sw,
 427  * depending on the testpmd command line configuration */
 428 static uint64_t
 429 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 430         uint64_t tx_offloads)
 431 {
 432         struct rte_ipv4_hdr *ipv4_hdr = l3_hdr;
 433         struct rte_udp_hdr *udp_hdr;
 434         struct rte_tcp_hdr *tcp_hdr;
 435         struct rte_sctp_hdr *sctp_hdr;
 436         uint64_t ol_flags = 0;
 437         uint32_t max_pkt_len, tso_segsz = 0;
 438
 439         /* ensure packet is large enough to require tso */
 440         if (!info->is_tunnel) {
 441                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 442                         info->tso_segsz;
 443                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 444                         tso_segsz = info->tso_segsz;
 445         } else {
 446                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 447                         info->l2_len + info->l3_len + info->l4_len +
 448                         info->tunnel_tso_segsz;
 449                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 450                         tso_segsz = info->tunnel_tso_segsz;
 451         }
 452
 453         if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 454                 ipv4_hdr = l3_hdr;
 455                 ipv4_hdr->hdr_checksum = 0;
 456
 457                 ol_flags |= PKT_TX_IPV4;
 458                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 459                         ol_flags |= PKT_TX_IP_CKSUM;
 460                 } else {
 461                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 462                                 ol_flags |= PKT_TX_IP_CKSUM;
 463                         else
 464                                 ipv4_hdr->hdr_checksum =
 465                                         rte_ipv4_cksum(ipv4_hdr);
 466                 }
 467         } else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV6))
 468                 ol_flags |= PKT_TX_IPV6;
 469         else
 470                 return 0; /* packet type not supported, nothing to do */
 471
 472         if (info->l4_proto == IPPROTO_UDP) {
 473                 udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len);
 474                 /* do not recalculate udp cksum if it was 0 */
 475                 if (udp_hdr->dgram_cksum != 0) {
 476                         udp_hdr->dgram_cksum = 0;
 477                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 478                                 ol_flags |= PKT_TX_UDP_CKSUM;
 479                         else {
 480                                 udp_hdr->dgram_cksum =
 481                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 482                                                 info->ethertype);
 483                         }
 484                 }
 485                 if (info->gso_enable)
 486                         ol_flags |= PKT_TX_UDP_SEG;
 487         } else if (info->l4_proto == IPPROTO_TCP) {
 488                 tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
 489                 tcp_hdr->cksum = 0;
 490                 if (tso_segsz)
 491                         ol_flags |= PKT_TX_TCP_SEG;
 492                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 493                         ol_flags |= PKT_TX_TCP_CKSUM;
 494                 else {
 495                         tcp_hdr->cksum =
 496                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 497                                         info->ethertype);
 498                 }
 499                 if (info->gso_enable)
 500                         ol_flags |= PKT_TX_TCP_SEG;
 501         } else if (info->l4_proto == IPPROTO_SCTP) {
 502                 sctp_hdr = (struct rte_sctp_hdr *)
 503                         ((char *)l3_hdr + info->l3_len);
 504                 sctp_hdr->cksum = 0;
 505                 /* sctp payload must be a multiple of 4 to be
 506                  * offloaded */
 507                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 508                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 509                         ol_flags |= PKT_TX_SCTP_CKSUM;
 510                 } else {
 511                         /* XXX implement CRC32c, example available in
 512                          * RFC3309 */
 513                 }
 514         }
 515
 516         return ol_flags;
 517 }
 518
 519 /* Calculate the checksum of outer header */
 520 static uint64_t
 521 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 522         uint64_t tx_offloads, int tso_enabled)
 523 {
 524         struct rte_ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 525         struct rte_ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 526         struct rte_udp_hdr *udp_hdr;
 527         uint64_t ol_flags = 0;
 528
 529         if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 530                 ipv4_hdr->hdr_checksum = 0;
 531                 ol_flags |= PKT_TX_OUTER_IPV4;
 532
 533                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 534                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 535                 else
 536                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 537         } else
 538                 ol_flags |= PKT_TX_OUTER_IPV6;
 539
 540         if (info->outer_l4_proto != IPPROTO_UDP)
 541                 return ol_flags;
 542
 543         udp_hdr = (struct rte_udp_hdr *)
 544                 ((char *)outer_l3_hdr + info->outer_l3_len);
 545
 546         /* Skip SW outer UDP checksum generation if HW supports it */
 547         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 548                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 549                         udp_hdr->dgram_cksum
 550                                 = rte_ipv4_phdr_cksum(ipv4_hdr, ol_flags);
 551                 else
 552                         udp_hdr->dgram_cksum
 553                                 = rte_ipv6_phdr_cksum(ipv6_hdr, ol_flags);
 554
 555                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 556                 return ol_flags;
 557         }
 558
 559         /* outer UDP checksum is done in software. In the other side, for
 560          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 561          * set to zero.
 562          *
 563          * If a packet will be TSOed into small packets by NIC, we cannot
 564          * set/calculate a non-zero checksum, because it will be a wrong
 565          * value after the packet be split into several small packets.
 566          */
 567         if (tso_enabled)
 568                 udp_hdr->dgram_cksum = 0;
 569
 570         /* do not recalculate udp cksum if it was 0 */
 571         if (udp_hdr->dgram_cksum != 0) {
 572                 udp_hdr->dgram_cksum = 0;
 573                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 574                         udp_hdr->dgram_cksum =
 575                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 576                 else
 577                         udp_hdr->dgram_cksum =
 578                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 579         }
 580
 581         return ol_flags;
 582 }
 583
 584 /*
 585  * Helper function.
 586  * Performs actual copying.
 587  * Returns number of segments in the destination mbuf on success,
 588  * or negative error code on failure.
 589  */
 590 static int
 591 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 592         uint16_t seglen[], uint8_t nb_seg)
 593 {
 594         uint32_t dlen, slen, tlen;
 595         uint32_t i, len;
 596         const struct rte_mbuf *m;
 597         const uint8_t *src;
 598         uint8_t *dst;
 599
 600         dlen = 0;
 601         slen = 0;
 602         tlen = 0;
 603
 604         dst = NULL;
 605         src = NULL;
 606
 607         m = ms;
 608         i = 0;
 609         while (ms != NULL && i != nb_seg) {
 610
 611                 if (slen == 0) {
 612                         slen = rte_pktmbuf_data_len(ms);
 613                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 614                 }
 615
 616                 if (dlen == 0) {
 617                         dlen = RTE_MIN(seglen[i], slen);
 618                         md[i]->data_len = dlen;
 619                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 620                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 621                 }
 622
 623                 len = RTE_MIN(slen, dlen);
 624                 memcpy(dst, src, len);
 625                 tlen += len;
 626                 slen -= len;
 627                 dlen -= len;
 628                 src += len;
 629                 dst += len;
 630
 631                 if (slen == 0)
 632                         ms = ms->next;
 633                 if (dlen == 0)
 634                         i++;
 635         }
 636
 637         if (ms != NULL)
 638                 return -ENOBUFS;
 639         else if (tlen != m->pkt_len)
 640                 return -EINVAL;
 641
 642         md[0]->nb_segs = nb_seg;
 643         md[0]->pkt_len = tlen;
 644         md[0]->vlan_tci = m->vlan_tci;
 645         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 646         md[0]->ol_flags = m->ol_flags;
 647         md[0]->tx_offload = m->tx_offload;
 648
 649         return nb_seg;
 650 }
 651
 652 /*
 653  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 654  * Copy packet contents and offload information into the new segmented mbuf.
 655  */
 656 static struct rte_mbuf *
 657 pkt_copy_split(const struct rte_mbuf *pkt)
 658 {
 659         int32_t n, rc;
 660         uint32_t i, len, nb_seg;
 661         struct rte_mempool *mp;
 662         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 663         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 664
 665         mp = current_fwd_lcore()->mbp;
 666
 667         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 668                 nb_seg = random() % tx_pkt_nb_segs + 1;
 669         else
 670                 nb_seg = tx_pkt_nb_segs;
 671
 672         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 673
 674         /* calculate number of segments to use and their length. */
 675         len = 0;
 676         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 677                 len += seglen[i];
 678                 md[i] = NULL;
 679         }
 680
 681         n = pkt->pkt_len - len;
 682
 683         /* update size of the last segment to fit rest of the packet */
 684         if (n >= 0) {
 685                 seglen[i - 1] += n;
 686                 len += n;
 687         }
 688
 689         nb_seg = i;
 690         while (i != 0) {
 691                 p = rte_pktmbuf_alloc(mp);
 692                 if (p == NULL) {
 693                         TESTPMD_LOG(ERR,
 694                                 "failed to allocate %u-th of %u mbuf "
 695                                 "from mempool: %s\n",
 696                                 nb_seg - i, nb_seg, mp->name);
 697                         break;
 698                 }
 699
 700                 md[--i] = p;
 701                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 702                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 703                                 "expected seglen: %u, "
 704                                 "actual mbuf tailroom: %u\n",
 705                                 mp->name, i, seglen[i],
 706                                 rte_pktmbuf_tailroom(md[i]));
 707                         break;
 708                 }
 709         }
 710
 711         /* all mbufs successfully allocated, do copy */
 712         if (i == 0) {
 713                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 714                 if (rc < 0)
 715                         TESTPMD_LOG(ERR,
 716                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 717                                 "into %u segments failed with error code: %d\n",
 718                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 719
 720                 /* figure out how many mbufs to free. */
 721                 i = RTE_MAX(rc, 0);
 722         }
 723
 724         /* free unused mbufs */
 725         for (; i != nb_seg; i++) {
 726                 rte_pktmbuf_free_seg(md[i]);
 727                 md[i] = NULL;
 728         }
 729
 730         return md[0];
 731 }
 732
 733 /*
 734  * Receive a burst of packets, and for each packet:
 735  *  - parse packet, and try to recognize a supported packet type (1)
 736  *  - if it's not a supported packet type, don't touch the packet, else:
 737  *  - reprocess the checksum of all supported layers. This is done in SW
 738  *    or HW, depending on testpmd command line configuration
 739  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 740  *    segmentation offload (this implies HW TCP checksum)
 741  * Then transmit packets on the output port.
 742  *
 743  * (1) Supported packets are:
 744  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 745  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 746  *           UDP|TCP|SCTP
 747  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 748  *           UDP|TCP|SCTP
 749  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 750  *           UDP|TCP|SCTP
 751  *   Ether / (vlan) / outer IP / outer UDP / GTP / IP|IP6 / UDP|TCP|SCTP
 752  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 753  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 754  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 755  *
 756  * The testpmd command line for this forward engine sets the flags
 757  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 758  * wether a checksum must be calculated in software or in hardware. The
 759  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 760  * OUTER_IP is only useful for tunnel packets.
 761  */
 762 static void
 763 pkt_burst_checksum_forward(struct fwd_stream *fs)
 764 {
 765         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 766         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 767         struct rte_gso_ctx *gso_ctx;
 768         struct rte_mbuf **tx_pkts_burst;
 769         struct rte_port *txp;
 770         struct rte_mbuf *m, *p;
 771         struct rte_ether_hdr *eth_hdr;
 772         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 773         void **gro_ctx;
 774         uint16_t gro_pkts_num;
 775         uint8_t gro_enable;
 776         uint16_t nb_rx;
 777         uint16_t nb_tx;
 778         uint16_t nb_prep;
 779         uint16_t i;
 780         uint64_t rx_ol_flags, tx_ol_flags;
 781         uint64_t tx_offloads;
 782         uint32_t retry;
 783         uint32_t rx_bad_ip_csum;
 784         uint32_t rx_bad_l4_csum;
 785         uint32_t rx_bad_outer_l4_csum;
 786         struct testpmd_offload_info info;
 787         uint16_t nb_segments = 0;
 788         int ret;
 789
 790 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 791         uint64_t start_tsc;
 792         uint64_t end_tsc;
 793         uint64_t core_cycles;
 794 #endif
 795
 796 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 797         start_tsc = rte_rdtsc();
 798 #endif
 799
 800         /* receive a burst of packet */
 801         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 802                                  nb_pkt_per_burst);
 803         if (unlikely(nb_rx == 0))
 804                 return;
 805 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 806         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 807 #endif
 808         fs->rx_packets += nb_rx;
 809         rx_bad_ip_csum = 0;
 810         rx_bad_l4_csum = 0;
 811         rx_bad_outer_l4_csum = 0;
 812         gro_enable = gro_ports[fs->rx_port].enable;
 813
 814         txp = &ports[fs->tx_port];
 815         tx_offloads = txp->dev_conf.txmode.offloads;
 816         memset(&info, 0, sizeof(info));
 817         info.tso_segsz = txp->tso_segsz;
 818         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 819         if (gso_ports[fs->tx_port].enable)
 820                 info.gso_enable = 1;
 821
 822         for (i = 0; i < nb_rx; i++) {
 823                 if (likely(i < nb_rx - 1))
 824                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 825                                                        void *));
 826
 827                 m = pkts_burst[i];
 828                 info.is_tunnel = 0;
 829                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 830                 tx_ol_flags = m->ol_flags &
 831                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 832                 rx_ol_flags = m->ol_flags;
 833
 834                 /* Update the L3/L4 checksum error packet statistics */
 835                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 836                         rx_bad_ip_csum += 1;
 837                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 838                         rx_bad_l4_csum += 1;
 839                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 840                         rx_bad_outer_l4_csum += 1;
 841
 842                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 843                  * and inner headers */
 844
 845                 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 846                 rte_ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 847                                 &eth_hdr->d_addr);
 848                 rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
 849                                 &eth_hdr->s_addr);
 850                 parse_ethernet(eth_hdr, &info);
 851                 l3_hdr = (char *)eth_hdr + info.l2_len;
 852
 853                 /* check if it's a supported tunnel */
 854                 if (txp->parse_tunnel) {
 855                         if (info.l4_proto == IPPROTO_UDP) {
 856                                 struct rte_udp_hdr *udp_hdr;
 857
 858                                 udp_hdr = (struct rte_udp_hdr *)
 859                                         ((char *)l3_hdr + info.l3_len);
 860                                 parse_gtp(udp_hdr, &info);
 861                                 if (info.is_tunnel) {
 862                                         tx_ol_flags |= PKT_TX_TUNNEL_GTP;
 863                                         goto tunnel_update;
 864                                 }
 865                                 parse_vxlan_gpe(udp_hdr, &info);
 866                                 if (info.is_tunnel) {
 867                                         tx_ol_flags |=
 868                                                 PKT_TX_TUNNEL_VXLAN_GPE;
 869                                         goto tunnel_update;
 870                                 }
 871                                 parse_vxlan(udp_hdr, &info,
 872                                             m->packet_type);
 873                                 if (info.is_tunnel)
 874                                         tx_ol_flags |=
 875                                                 PKT_TX_TUNNEL_VXLAN;
 876                         } else if (info.l4_proto == IPPROTO_GRE) {
 877                                 struct simple_gre_hdr *gre_hdr;
 878
 879                                 gre_hdr = (struct simple_gre_hdr *)
 880                                         ((char *)l3_hdr + info.l3_len);
 881                                 parse_gre(gre_hdr, &info);
 882                                 if (info.is_tunnel)
 883                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 884                         } else if (info.l4_proto == IPPROTO_IPIP) {
 885                                 void *encap_ip_hdr;
 886
 887                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 888                                 parse_encap_ip(encap_ip_hdr, &info);
 889                                 if (info.is_tunnel)
 890                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 891                         }
 892                 }
 893
 894 tunnel_update:
 895                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 896                 if (info.is_tunnel) {
 897                         outer_l3_hdr = l3_hdr;
 898                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 899                 }
 900
 901                 /* step 2: depending on user command line configuration,
 902                  * recompute checksum either in software or flag the
 903                  * mbuf to offload the calculation to the NIC. If TSO
 904                  * is configured, prepare the mbuf for TCP segmentation. */
 905
 906                 /* process checksums of inner headers first */
 907                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 908                         tx_offloads);
 909
 910                 /* Then process outer headers if any. Note that the software
 911                  * checksum will be wrong if one of the inner checksums is
 912                  * processed in hardware. */
 913                 if (info.is_tunnel == 1) {
 914                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 915                                         tx_offloads,
 916                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 917                 }
 918
 919                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 920
 921                 m->tx_offload = 0;
 922                 if (info.is_tunnel == 1) {
 923                         if (info.tunnel_tso_segsz ||
 924                             (tx_offloads &
 925                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 926                             (tx_offloads &
 927                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 928                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 929                                 m->outer_l2_len = info.outer_l2_len;
 930                                 m->outer_l3_len = info.outer_l3_len;
 931                                 m->l2_len = info.l2_len;
 932                                 m->l3_len = info.l3_len;
 933                                 m->l4_len = info.l4_len;
 934                                 m->tso_segsz = info.tunnel_tso_segsz;
 935                         }
 936                         else {
 937                                 /* if there is a outer UDP cksum
 938                                    processed in sw and the inner in hw,
 939                                    the outer checksum will be wrong as
 940                                    the payload will be modified by the
 941                                    hardware */
 942                                 m->l2_len = info.outer_l2_len +
 943                                         info.outer_l3_len + info.l2_len;
 944                                 m->l3_len = info.l3_len;
 945                                 m->l4_len = info.l4_len;
 946                         }
 947                 } else {
 948                         /* this is only useful if an offload flag is
 949                          * set, but it does not hurt to fill it in any
 950                          * case */
 951                         m->l2_len = info.l2_len;
 952                         m->l3_len = info.l3_len;
 953                         m->l4_len = info.l4_len;
 954                         m->tso_segsz = info.tso_segsz;
 955                 }
 956                 m->ol_flags = tx_ol_flags;
 957
 958                 /* Do split & copy for the packet. */
 959                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 960                         p = pkt_copy_split(m);
 961                         if (p != NULL) {
 962                                 rte_pktmbuf_free(m);
 963                                 m = p;
 964                                 pkts_burst[i] = m;
 965                         }
 966                 }
 967
 968                 /* if verbose mode is enabled, dump debug info */
 969                 if (verbose_level > 0) {
 970                         char buf[256];
 971
 972                         printf("-----------------\n");
 973                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 974                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 975                         /* dump rx parsed packet info */
 976                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 977                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 978                                 "l4_proto=%d l4_len=%d flags=%s\n",
 979                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 980                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 981                         if (rx_ol_flags & PKT_RX_LRO)
 982                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 983                         if (info.is_tunnel == 1)
 984                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 985                                         "outer_l3_len=%d\n", info.outer_l2_len,
 986                                         rte_be_to_cpu_16(info.outer_ethertype),
 987                                         info.outer_l3_len);
 988                         /* dump tx packet info */
 989                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 990                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 991                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 992                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 993                                 info.tso_segsz != 0)
 994                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 995                                         "m->l4_len=%d\n",
 996                                         m->l2_len, m->l3_len, m->l4_len);
 997                         if (info.is_tunnel == 1) {
 998                                 if ((tx_offloads &
 999                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
1000                                     (tx_offloads &
1001                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
1002                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
1003                                         printf("tx: m->outer_l2_len=%d "
1004                                                 "m->outer_l3_len=%d\n",
1005                                                 m->outer_l2_len,
1006                                                 m->outer_l3_len);
1007                                 if (info.tunnel_tso_segsz != 0 &&
1008                                                 (m->ol_flags & PKT_TX_TCP_SEG))
1009                                         printf("tx: m->tso_segsz=%d\n",
1010                                                 m->tso_segsz);
1011                         } else if (info.tso_segsz != 0 &&
1012                                         (m->ol_flags & PKT_TX_TCP_SEG))
1013                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
1014                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
1015                         printf("tx: flags=%s", buf);
1016                         printf("\n");
1017                 }
1018         }
1019
1020         if (unlikely(gro_enable)) {
1021                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
1022                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
1023                                         &(gro_ports[fs->rx_port].param));
1024                 } else {
1025                         gro_ctx = current_fwd_lcore()->gro_ctx;
1026                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
1027
1028                         if (++fs->gro_times >= gro_flush_cycles) {
1029                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
1030                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
1031                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
1032
1033                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
1034                                                 RTE_GRO_TCP_IPV4,
1035                                                 &pkts_burst[nb_rx],
1036                                                 gro_pkts_num);
1037                                 fs->gro_times = 0;
1038                         }
1039                 }
1040         }
1041
1042         if (gso_ports[fs->tx_port].enable == 0)
1043                 tx_pkts_burst = pkts_burst;
1044         else {
1045                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
1046                 gso_ctx->gso_size = gso_max_segment_size;
1047                 for (i = 0; i < nb_rx; i++) {
1048                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
1049                                         &gso_segments[nb_segments],
1050                                         GSO_MAX_PKT_BURST - nb_segments);
1051                         if (ret >= 0)
1052                                 nb_segments += ret;
1053                         else {
1054                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
1055                                 rte_pktmbuf_free(pkts_burst[i]);
1056                         }
1057                 }
1058
1059                 tx_pkts_burst = gso_segments;
1060                 nb_rx = nb_segments;
1061         }
1062
1063         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
1064                         tx_pkts_burst, nb_rx);
1065         if (nb_prep != nb_rx)
1066                 printf("Preparing packet burst to transmit failed: %s\n",
1067                                 rte_strerror(rte_errno));
1068
1069         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
1070                         nb_prep);
1071
1072         /*
1073          * Retry if necessary
1074          */
1075         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
1076                 retry = 0;
1077                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
1078                         rte_delay_us(burst_tx_delay_time);
1079                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
1080                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
1081                 }
1082         }
1083         fs->tx_packets += nb_tx;
1084         fs->rx_bad_ip_csum += rx_bad_ip_csum;
1085         fs->rx_bad_l4_csum += rx_bad_l4_csum;
1086         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
1087
1088 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1089         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1090 #endif
1091         if (unlikely(nb_tx < nb_rx)) {
1092                 fs->fwd_dropped += (nb_rx - nb_tx);
1093                 do {
1094                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1095                 } while (++nb_tx < nb_rx);
1096         }
1097
1098 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1099         end_tsc = rte_rdtsc();
1100         core_cycles = (end_tsc - start_tsc);
1101         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1102 #endif
1103 }
1104
1105 struct fwd_engine csum_fwd_engine = {
1106         .fwd_mode_name  = "csum",
1107         .port_fwd_begin = NULL,
1108         .port_fwd_end   = NULL,
1109         .packet_fwd     = pkt_burst_checksum_forward,
1110 };