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_vxlan.h>
  39 #include <rte_sctp.h>
  40 #include <rte_gtp.h>
  41 #include <rte_prefetch.h>
  42 #include <rte_string_fns.h>
  43 #include <rte_flow.h>
  44 #include <rte_gro.h>
  45 #include <rte_gso.h>
  46
  47 #include "testpmd.h"
  48
  49 #define IP_DEFTTL  64   /* from RFC 1340. */
  50 #define IP_VERSION 0x40
  51 #define IP_HDRLEN  0x05 /* default IP header length == five 32-bits words. */
  52 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
  53
  54 #define GRE_CHECKSUM_PRESENT    0x8000
  55 #define GRE_KEY_PRESENT         0x2000
  56 #define GRE_SEQUENCE_PRESENT    0x1000
  57 #define GRE_EXT_LEN             4
  58 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  59                                  GRE_SEQUENCE_PRESENT)
  60
  61 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  62 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  63 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  64 #else
  65 #define _htons(x) (x)
  66 #endif
  67
  68 uint16_t vxlan_gpe_udp_port = 4790;
  69
  70 /* structure that caches offload info for the current packet */
  71 struct testpmd_offload_info {
  72         uint16_t ethertype;
  73         uint8_t gso_enable;
  74         uint16_t l2_len;
  75         uint16_t l3_len;
  76         uint16_t l4_len;
  77         uint8_t l4_proto;
  78         uint8_t is_tunnel;
  79         uint16_t outer_ethertype;
  80         uint16_t outer_l2_len;
  81         uint16_t outer_l3_len;
  82         uint8_t outer_l4_proto;
  83         uint16_t tso_segsz;
  84         uint16_t tunnel_tso_segsz;
  85         uint32_t pkt_len;
  86 };
  87
  88 /* simplified GRE header */
  89 struct simple_gre_hdr {
  90         uint16_t flags;
  91         uint16_t proto;
  92 } __attribute__((__packed__));
  93
  94 static uint16_t
  95 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  96 {
  97         if (ethertype == _htons(RTE_ETHER_TYPE_IPV4))
  98                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  99         else /* assume ethertype == RTE_ETHER_TYPE_IPV6 */
 100                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
 101 }
 102
 103 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 104 static void
 105 parse_ipv4(struct rte_ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 106 {
 107         struct rte_tcp_hdr *tcp_hdr;
 108
 109         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 110         info->l4_proto = ipv4_hdr->next_proto_id;
 111
 112         /* only fill l4_len for TCP, it's useful for TSO */
 113         if (info->l4_proto == IPPROTO_TCP) {
 114                 tcp_hdr = (struct rte_tcp_hdr *)
 115                         ((char *)ipv4_hdr + info->l3_len);
 116                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 117         } else if (info->l4_proto == IPPROTO_UDP)
 118                 info->l4_len = sizeof(struct rte_udp_hdr);
 119         else
 120                 info->l4_len = 0;
 121 }
 122
 123 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
 124 static void
 125 parse_ipv6(struct rte_ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 126 {
 127         struct rte_tcp_hdr *tcp_hdr;
 128
 129         info->l3_len = sizeof(struct rte_ipv6_hdr);
 130         info->l4_proto = ipv6_hdr->proto;
 131
 132         /* only fill l4_len for TCP, it's useful for TSO */
 133         if (info->l4_proto == IPPROTO_TCP) {
 134                 tcp_hdr = (struct rte_tcp_hdr *)
 135                         ((char *)ipv6_hdr + info->l3_len);
 136                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 137         } else if (info->l4_proto == IPPROTO_UDP)
 138                 info->l4_len = sizeof(struct rte_udp_hdr);
 139         else
 140                 info->l4_len = 0;
 141 }
 142
 143 /*
 144  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 145  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
 146  * header. The l4_len argument is only set in case of TCP (useful for TSO).
 147  */
 148 static void
 149 parse_ethernet(struct rte_ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 150 {
 151         struct rte_ipv4_hdr *ipv4_hdr;
 152         struct rte_ipv6_hdr *ipv6_hdr;
 153
 154         info->l2_len = sizeof(struct rte_ether_hdr);
 155         info->ethertype = eth_hdr->ether_type;
 156
 157         if (info->ethertype == _htons(RTE_ETHER_TYPE_VLAN)) {
 158                 struct rte_vlan_hdr *vlan_hdr = (
 159                         struct rte_vlan_hdr *)(eth_hdr + 1);
 160
 161                 info->l2_len  += sizeof(struct rte_vlan_hdr);
 162                 info->ethertype = vlan_hdr->eth_proto;
 163         }
 164
 165         switch (info->ethertype) {
 166         case _htons(RTE_ETHER_TYPE_IPV4):
 167                 ipv4_hdr = (struct rte_ipv4_hdr *)
 168                         ((char *)eth_hdr + info->l2_len);
 169                 parse_ipv4(ipv4_hdr, info);
 170                 break;
 171         case _htons(RTE_ETHER_TYPE_IPV6):
 172                 ipv6_hdr = (struct rte_ipv6_hdr *)
 173                         ((char *)eth_hdr + info->l2_len);
 174                 parse_ipv6(ipv6_hdr, info);
 175                 break;
 176         default:
 177                 info->l4_len = 0;
 178                 info->l3_len = 0;
 179                 info->l4_proto = 0;
 180                 break;
 181         }
 182 }
 183
 184 /*
 185  * Parse a GTP protocol header.
 186  * No optional fields and next extension header type.
 187  */
 188 static void
 189 parse_gtp(struct rte_udp_hdr *udp_hdr,
 190           struct testpmd_offload_info *info)
 191 {
 192         struct rte_ipv4_hdr *ipv4_hdr;
 193         struct rte_ipv6_hdr *ipv6_hdr;
 194         struct rte_gtp_hdr *gtp_hdr;
 195         uint8_t gtp_len = sizeof(*gtp_hdr);
 196         uint8_t ip_ver;
 197
 198         /* Check udp destination port. */
 199         if (udp_hdr->dst_port != _htons(RTE_GTPC_UDP_PORT) &&
 200             udp_hdr->src_port != _htons(RTE_GTPC_UDP_PORT) &&
 201             udp_hdr->dst_port != _htons(RTE_GTPU_UDP_PORT))
 202                 return;
 203
 204         info->is_tunnel = 1;
 205         info->outer_ethertype = info->ethertype;
 206         info->outer_l2_len = info->l2_len;
 207         info->outer_l3_len = info->l3_len;
 208         info->outer_l4_proto = info->l4_proto;
 209         info->l2_len = 0;
 210
 211         gtp_hdr = (struct rte_gtp_hdr *)((char *)udp_hdr +
 212                   sizeof(struct rte_udp_hdr));
 213
 214         /*
 215          * Check message type. If message type is 0xff, it is
 216          * a GTP data packet. If not, it is a GTP control packet
 217          */
 218         if (gtp_hdr->msg_type == 0xff) {
 219                 ip_ver = *(uint8_t *)((char *)udp_hdr +
 220                          sizeof(struct rte_udp_hdr) +
 221                          sizeof(struct rte_gtp_hdr));
 222                 ip_ver = (ip_ver) & 0xf0;
 223
 224                 if (ip_ver == RTE_GTP_TYPE_IPV4) {
 225                         ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gtp_hdr +
 226                                    gtp_len);
 227                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 228                         parse_ipv4(ipv4_hdr, info);
 229                 } else if (ip_ver == RTE_GTP_TYPE_IPV6) {
 230                         ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gtp_hdr +
 231                                    gtp_len);
 232                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 233                         parse_ipv6(ipv6_hdr, info);
 234                 }
 235         } else {
 236                 info->ethertype = 0;
 237                 info->l4_len = 0;
 238                 info->l3_len = 0;
 239                 info->l4_proto = 0;
 240         }
 241
 242         info->l2_len += RTE_ETHER_GTP_HLEN;
 243 }
 244
 245 /* Parse a vxlan header */
 246 static void
 247 parse_vxlan(struct rte_udp_hdr *udp_hdr,
 248             struct testpmd_offload_info *info,
 249             uint32_t pkt_type)
 250 {
 251         struct rte_ether_hdr *eth_hdr;
 252
 253         /* check udp destination port, 4789 is the default vxlan port
 254          * (rfc7348) or that the rx offload flag is set (i40e only
 255          * currently) */
 256         if (udp_hdr->dst_port != _htons(4789) &&
 257                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 258                 return;
 259
 260         info->is_tunnel = 1;
 261         info->outer_ethertype = info->ethertype;
 262         info->outer_l2_len = info->l2_len;
 263         info->outer_l3_len = info->l3_len;
 264         info->outer_l4_proto = info->l4_proto;
 265
 266         eth_hdr = (struct rte_ether_hdr *)((char *)udp_hdr +
 267                 sizeof(struct rte_udp_hdr) +
 268                 sizeof(struct rte_vxlan_hdr));
 269
 270         parse_ethernet(eth_hdr, info);
 271         info->l2_len += RTE_ETHER_VXLAN_HLEN; /* add udp + vxlan */
 272 }
 273
 274 /* Parse a vxlan-gpe header */
 275 static void
 276 parse_vxlan_gpe(struct rte_udp_hdr *udp_hdr,
 277             struct testpmd_offload_info *info)
 278 {
 279         struct rte_ether_hdr *eth_hdr;
 280         struct rte_ipv4_hdr *ipv4_hdr;
 281         struct rte_ipv6_hdr *ipv6_hdr;
 282         struct rte_vxlan_gpe_hdr *vxlan_gpe_hdr;
 283         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 284
 285         /* Check udp destination port. */
 286         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 287                 return;
 288
 289         vxlan_gpe_hdr = (struct rte_vxlan_gpe_hdr *)((char *)udp_hdr +
 290                                 sizeof(struct rte_udp_hdr));
 291
 292         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 293             RTE_VXLAN_GPE_TYPE_IPV4) {
 294                 info->is_tunnel = 1;
 295                 info->outer_ethertype = info->ethertype;
 296                 info->outer_l2_len = info->l2_len;
 297                 info->outer_l3_len = info->l3_len;
 298                 info->outer_l4_proto = info->l4_proto;
 299
 300                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)vxlan_gpe_hdr +
 301                            vxlan_gpe_len);
 302
 303                 parse_ipv4(ipv4_hdr, info);
 304                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 305                 info->l2_len = 0;
 306
 307         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_IPV6) {
 308                 info->is_tunnel = 1;
 309                 info->outer_ethertype = info->ethertype;
 310                 info->outer_l2_len = info->l2_len;
 311                 info->outer_l3_len = info->l3_len;
 312                 info->outer_l4_proto = info->l4_proto;
 313
 314                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)vxlan_gpe_hdr +
 315                            vxlan_gpe_len);
 316
 317                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 318                 parse_ipv6(ipv6_hdr, info);
 319                 info->l2_len = 0;
 320
 321         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_ETH) {
 322                 info->is_tunnel = 1;
 323                 info->outer_ethertype = info->ethertype;
 324                 info->outer_l2_len = info->l2_len;
 325                 info->outer_l3_len = info->l3_len;
 326                 info->outer_l4_proto = info->l4_proto;
 327
 328                 eth_hdr = (struct rte_ether_hdr *)((char *)vxlan_gpe_hdr +
 329                           vxlan_gpe_len);
 330
 331                 parse_ethernet(eth_hdr, info);
 332         } else
 333                 return;
 334
 335         info->l2_len += RTE_ETHER_VXLAN_GPE_HLEN;
 336 }
 337
 338 /* Parse a gre header */
 339 static void
 340 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 341 {
 342         struct rte_ether_hdr *eth_hdr;
 343         struct rte_ipv4_hdr *ipv4_hdr;
 344         struct rte_ipv6_hdr *ipv6_hdr;
 345         uint8_t gre_len = 0;
 346
 347         gre_len += sizeof(struct simple_gre_hdr);
 348
 349         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 350                 gre_len += GRE_EXT_LEN;
 351         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 352                 gre_len += GRE_EXT_LEN;
 353         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 354                 gre_len += GRE_EXT_LEN;
 355
 356         if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV4)) {
 357                 info->is_tunnel = 1;
 358                 info->outer_ethertype = info->ethertype;
 359                 info->outer_l2_len = info->l2_len;
 360                 info->outer_l3_len = info->l3_len;
 361                 info->outer_l4_proto = info->l4_proto;
 362
 363                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gre_hdr + gre_len);
 364
 365                 parse_ipv4(ipv4_hdr, info);
 366                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 367                 info->l2_len = 0;
 368
 369         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV6)) {
 370                 info->is_tunnel = 1;
 371                 info->outer_ethertype = info->ethertype;
 372                 info->outer_l2_len = info->l2_len;
 373                 info->outer_l3_len = info->l3_len;
 374                 info->outer_l4_proto = info->l4_proto;
 375
 376                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gre_hdr + gre_len);
 377
 378                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 379                 parse_ipv6(ipv6_hdr, info);
 380                 info->l2_len = 0;
 381
 382         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_TEB)) {
 383                 info->is_tunnel = 1;
 384                 info->outer_ethertype = info->ethertype;
 385                 info->outer_l2_len = info->l2_len;
 386                 info->outer_l3_len = info->l3_len;
 387                 info->outer_l4_proto = info->l4_proto;
 388
 389                 eth_hdr = (struct rte_ether_hdr *)((char *)gre_hdr + gre_len);
 390
 391                 parse_ethernet(eth_hdr, info);
 392         } else
 393                 return;
 394
 395         info->l2_len += gre_len;
 396 }
 397
 398
 399 /* Parse an encapsulated ip or ipv6 header */
 400 static void
 401 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 402 {
 403         struct rte_ipv4_hdr *ipv4_hdr = encap_ip;
 404         struct rte_ipv6_hdr *ipv6_hdr = encap_ip;
 405         uint8_t ip_version;
 406
 407         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 408
 409         if (ip_version != 4 && ip_version != 6)
 410                 return;
 411
 412         info->is_tunnel = 1;
 413         info->outer_ethertype = info->ethertype;
 414         info->outer_l2_len = info->l2_len;
 415         info->outer_l3_len = info->l3_len;
 416
 417         if (ip_version == 4) {
 418                 parse_ipv4(ipv4_hdr, info);
 419                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 420         } else {
 421                 parse_ipv6(ipv6_hdr, info);
 422                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 423         }
 424         info->l2_len = 0;
 425 }
 426
 427 /* if possible, calculate the checksum of a packet in hw or sw,
 428  * depending on the testpmd command line configuration */
 429 static uint64_t
 430 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 431         uint64_t tx_offloads)
 432 {
 433         struct rte_ipv4_hdr *ipv4_hdr = l3_hdr;
 434         struct rte_udp_hdr *udp_hdr;
 435         struct rte_tcp_hdr *tcp_hdr;
 436         struct rte_sctp_hdr *sctp_hdr;
 437         uint64_t ol_flags = 0;
 438         uint32_t max_pkt_len, tso_segsz = 0;
 439
 440         /* ensure packet is large enough to require tso */
 441         if (!info->is_tunnel) {
 442                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 443                         info->tso_segsz;
 444                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 445                         tso_segsz = info->tso_segsz;
 446         } else {
 447                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 448                         info->l2_len + info->l3_len + info->l4_len +
 449                         info->tunnel_tso_segsz;
 450                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 451                         tso_segsz = info->tunnel_tso_segsz;
 452         }
 453
 454         if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 455                 ipv4_hdr = l3_hdr;
 456                 ipv4_hdr->hdr_checksum = 0;
 457
 458                 ol_flags |= PKT_TX_IPV4;
 459                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 460                         ol_flags |= PKT_TX_IP_CKSUM;
 461                 } else {
 462                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 463                                 ol_flags |= PKT_TX_IP_CKSUM;
 464                         else
 465                                 ipv4_hdr->hdr_checksum =
 466                                         rte_ipv4_cksum(ipv4_hdr);
 467                 }
 468         } else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV6))
 469                 ol_flags |= PKT_TX_IPV6;
 470         else
 471                 return 0; /* packet type not supported, nothing to do */
 472
 473         if (info->l4_proto == IPPROTO_UDP) {
 474                 udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len);
 475                 /* do not recalculate udp cksum if it was 0 */
 476                 if (udp_hdr->dgram_cksum != 0) {
 477                         udp_hdr->dgram_cksum = 0;
 478                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 479                                 ol_flags |= PKT_TX_UDP_CKSUM;
 480                         else {
 481                                 udp_hdr->dgram_cksum =
 482                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 483                                                 info->ethertype);
 484                         }
 485                 }
 486                 if (info->gso_enable)
 487                         ol_flags |= PKT_TX_UDP_SEG;
 488         } else if (info->l4_proto == IPPROTO_TCP) {
 489                 tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
 490                 tcp_hdr->cksum = 0;
 491                 if (tso_segsz)
 492                         ol_flags |= PKT_TX_TCP_SEG;
 493                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 494                         ol_flags |= PKT_TX_TCP_CKSUM;
 495                 else {
 496                         tcp_hdr->cksum =
 497                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 498                                         info->ethertype);
 499                 }
 500                 if (info->gso_enable)
 501                         ol_flags |= PKT_TX_TCP_SEG;
 502         } else if (info->l4_proto == IPPROTO_SCTP) {
 503                 sctp_hdr = (struct rte_sctp_hdr *)
 504                         ((char *)l3_hdr + info->l3_len);
 505                 sctp_hdr->cksum = 0;
 506                 /* sctp payload must be a multiple of 4 to be
 507                  * offloaded */
 508                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 509                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 510                         ol_flags |= PKT_TX_SCTP_CKSUM;
 511                 } else {
 512                         /* XXX implement CRC32c, example available in
 513                          * RFC3309 */
 514                 }
 515         }
 516
 517         return ol_flags;
 518 }
 519
 520 /* Calculate the checksum of outer header */
 521 static uint64_t
 522 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 523         uint64_t tx_offloads, int tso_enabled)
 524 {
 525         struct rte_ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 526         struct rte_ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 527         struct rte_udp_hdr *udp_hdr;
 528         uint64_t ol_flags = 0;
 529
 530         if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 531                 ipv4_hdr->hdr_checksum = 0;
 532                 ol_flags |= PKT_TX_OUTER_IPV4;
 533
 534                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 535                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 536                 else
 537                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 538         } else
 539                 ol_flags |= PKT_TX_OUTER_IPV6;
 540
 541         if (info->outer_l4_proto != IPPROTO_UDP)
 542                 return ol_flags;
 543
 544         udp_hdr = (struct rte_udp_hdr *)
 545                 ((char *)outer_l3_hdr + info->outer_l3_len);
 546
 547         /* Skip SW outer UDP checksum generation if HW supports it */
 548         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 549                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 550                         udp_hdr->dgram_cksum
 551                                 = rte_ipv4_phdr_cksum(ipv4_hdr, ol_flags);
 552                 else
 553                         udp_hdr->dgram_cksum
 554                                 = rte_ipv6_phdr_cksum(ipv6_hdr, ol_flags);
 555
 556                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 557                 return ol_flags;
 558         }
 559
 560         /* outer UDP checksum is done in software. In the other side, for
 561          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 562          * set to zero.
 563          *
 564          * If a packet will be TSOed into small packets by NIC, we cannot
 565          * set/calculate a non-zero checksum, because it will be a wrong
 566          * value after the packet be split into several small packets.
 567          */
 568         if (tso_enabled)
 569                 udp_hdr->dgram_cksum = 0;
 570
 571         /* do not recalculate udp cksum if it was 0 */
 572         if (udp_hdr->dgram_cksum != 0) {
 573                 udp_hdr->dgram_cksum = 0;
 574                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 575                         udp_hdr->dgram_cksum =
 576                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 577                 else
 578                         udp_hdr->dgram_cksum =
 579                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 580         }
 581
 582         return ol_flags;
 583 }
 584
 585 /*
 586  * Helper function.
 587  * Performs actual copying.
 588  * Returns number of segments in the destination mbuf on success,
 589  * or negative error code on failure.
 590  */
 591 static int
 592 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 593         uint16_t seglen[], uint8_t nb_seg)
 594 {
 595         uint32_t dlen, slen, tlen;
 596         uint32_t i, len;
 597         const struct rte_mbuf *m;
 598         const uint8_t *src;
 599         uint8_t *dst;
 600
 601         dlen = 0;
 602         slen = 0;
 603         tlen = 0;
 604
 605         dst = NULL;
 606         src = NULL;
 607
 608         m = ms;
 609         i = 0;
 610         while (ms != NULL && i != nb_seg) {
 611
 612                 if (slen == 0) {
 613                         slen = rte_pktmbuf_data_len(ms);
 614                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 615                 }
 616
 617                 if (dlen == 0) {
 618                         dlen = RTE_MIN(seglen[i], slen);
 619                         md[i]->data_len = dlen;
 620                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 621                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 622                 }
 623
 624                 len = RTE_MIN(slen, dlen);
 625                 memcpy(dst, src, len);
 626                 tlen += len;
 627                 slen -= len;
 628                 dlen -= len;
 629                 src += len;
 630                 dst += len;
 631
 632                 if (slen == 0)
 633                         ms = ms->next;
 634                 if (dlen == 0)
 635                         i++;
 636         }
 637
 638         if (ms != NULL)
 639                 return -ENOBUFS;
 640         else if (tlen != m->pkt_len)
 641                 return -EINVAL;
 642
 643         md[0]->nb_segs = nb_seg;
 644         md[0]->pkt_len = tlen;
 645         md[0]->vlan_tci = m->vlan_tci;
 646         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 647         md[0]->ol_flags = m->ol_flags;
 648         md[0]->tx_offload = m->tx_offload;
 649
 650         return nb_seg;
 651 }
 652
 653 /*
 654  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 655  * Copy packet contents and offload information into the new segmented mbuf.
 656  */
 657 static struct rte_mbuf *
 658 pkt_copy_split(const struct rte_mbuf *pkt)
 659 {
 660         int32_t n, rc;
 661         uint32_t i, len, nb_seg;
 662         struct rte_mempool *mp;
 663         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 664         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 665
 666         mp = current_fwd_lcore()->mbp;
 667
 668         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 669                 nb_seg = random() % tx_pkt_nb_segs + 1;
 670         else
 671                 nb_seg = tx_pkt_nb_segs;
 672
 673         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 674
 675         /* calculate number of segments to use and their length. */
 676         len = 0;
 677         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 678                 len += seglen[i];
 679                 md[i] = NULL;
 680         }
 681
 682         n = pkt->pkt_len - len;
 683
 684         /* update size of the last segment to fit rest of the packet */
 685         if (n >= 0) {
 686                 seglen[i - 1] += n;
 687                 len += n;
 688         }
 689
 690         nb_seg = i;
 691         while (i != 0) {
 692                 p = rte_pktmbuf_alloc(mp);
 693                 if (p == NULL) {
 694                         TESTPMD_LOG(ERR,
 695                                 "failed to allocate %u-th of %u mbuf "
 696                                 "from mempool: %s\n",
 697                                 nb_seg - i, nb_seg, mp->name);
 698                         break;
 699                 }
 700
 701                 md[--i] = p;
 702                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 703                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 704                                 "expected seglen: %u, "
 705                                 "actual mbuf tailroom: %u\n",
 706                                 mp->name, i, seglen[i],
 707                                 rte_pktmbuf_tailroom(md[i]));
 708                         break;
 709                 }
 710         }
 711
 712         /* all mbufs successfully allocated, do copy */
 713         if (i == 0) {
 714                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 715                 if (rc < 0)
 716                         TESTPMD_LOG(ERR,
 717                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 718                                 "into %u segments failed with error code: %d\n",
 719                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 720
 721                 /* figure out how many mbufs to free. */
 722                 i = RTE_MAX(rc, 0);
 723         }
 724
 725         /* free unused mbufs */
 726         for (; i != nb_seg; i++) {
 727                 rte_pktmbuf_free_seg(md[i]);
 728                 md[i] = NULL;
 729         }
 730
 731         return md[0];
 732 }
 733
 734 /*
 735  * Receive a burst of packets, and for each packet:
 736  *  - parse packet, and try to recognize a supported packet type (1)
 737  *  - if it's not a supported packet type, don't touch the packet, else:
 738  *  - reprocess the checksum of all supported layers. This is done in SW
 739  *    or HW, depending on testpmd command line configuration
 740  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 741  *    segmentation offload (this implies HW TCP checksum)
 742  * Then transmit packets on the output port.
 743  *
 744  * (1) Supported packets are:
 745  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 746  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 747  *           UDP|TCP|SCTP
 748  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 749  *           UDP|TCP|SCTP
 750  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 751  *           UDP|TCP|SCTP
 752  *   Ether / (vlan) / outer IP / outer UDP / GTP / IP|IP6 / UDP|TCP|SCTP
 753  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 754  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 755  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 756  *
 757  * The testpmd command line for this forward engine sets the flags
 758  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 759  * wether a checksum must be calculated in software or in hardware. The
 760  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 761  * OUTER_IP is only useful for tunnel packets.
 762  */
 763 static void
 764 pkt_burst_checksum_forward(struct fwd_stream *fs)
 765 {
 766         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 767         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 768         struct rte_gso_ctx *gso_ctx;
 769         struct rte_mbuf **tx_pkts_burst;
 770         struct rte_port *txp;
 771         struct rte_mbuf *m, *p;
 772         struct rte_ether_hdr *eth_hdr;
 773         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 774         void **gro_ctx;
 775         uint16_t gro_pkts_num;
 776         uint8_t gro_enable;
 777         uint16_t nb_rx;
 778         uint16_t nb_tx;
 779         uint16_t nb_prep;
 780         uint16_t i;
 781         uint64_t rx_ol_flags, tx_ol_flags;
 782         uint64_t tx_offloads;
 783         uint32_t retry;
 784         uint32_t rx_bad_ip_csum;
 785         uint32_t rx_bad_l4_csum;
 786         uint32_t rx_bad_outer_l4_csum;
 787         struct testpmd_offload_info info;
 788         uint16_t nb_segments = 0;
 789         int ret;
 790
 791 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 792         uint64_t start_tsc;
 793         uint64_t end_tsc;
 794         uint64_t core_cycles;
 795 #endif
 796
 797 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 798         start_tsc = rte_rdtsc();
 799 #endif
 800
 801         /* receive a burst of packet */
 802         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 803                                  nb_pkt_per_burst);
 804         if (unlikely(nb_rx == 0))
 805                 return;
 806 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 807         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 808 #endif
 809         fs->rx_packets += nb_rx;
 810         rx_bad_ip_csum = 0;
 811         rx_bad_l4_csum = 0;
 812         rx_bad_outer_l4_csum = 0;
 813         gro_enable = gro_ports[fs->rx_port].enable;
 814
 815         txp = &ports[fs->tx_port];
 816         tx_offloads = txp->dev_conf.txmode.offloads;
 817         memset(&info, 0, sizeof(info));
 818         info.tso_segsz = txp->tso_segsz;
 819         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 820         if (gso_ports[fs->tx_port].enable)
 821                 info.gso_enable = 1;
 822
 823         for (i = 0; i < nb_rx; i++) {
 824                 if (likely(i < nb_rx - 1))
 825                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 826                                                        void *));
 827
 828                 m = pkts_burst[i];
 829                 info.is_tunnel = 0;
 830                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 831                 tx_ol_flags = m->ol_flags &
 832                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 833                 rx_ol_flags = m->ol_flags;
 834
 835                 /* Update the L3/L4 checksum error packet statistics */
 836                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 837                         rx_bad_ip_csum += 1;
 838                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 839                         rx_bad_l4_csum += 1;
 840                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 841                         rx_bad_outer_l4_csum += 1;
 842
 843                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 844                  * and inner headers */
 845
 846                 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 847                 rte_ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 848                                 &eth_hdr->d_addr);
 849                 rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
 850                                 &eth_hdr->s_addr);
 851                 parse_ethernet(eth_hdr, &info);
 852                 l3_hdr = (char *)eth_hdr + info.l2_len;
 853
 854                 /* check if it's a supported tunnel */
 855                 if (txp->parse_tunnel) {
 856                         if (info.l4_proto == IPPROTO_UDP) {
 857                                 struct rte_udp_hdr *udp_hdr;
 858
 859                                 udp_hdr = (struct rte_udp_hdr *)
 860                                         ((char *)l3_hdr + info.l3_len);
 861                                 parse_gtp(udp_hdr, &info);
 862                                 if (info.is_tunnel) {
 863                                         tx_ol_flags |= PKT_TX_TUNNEL_GTP;
 864                                         goto tunnel_update;
 865                                 }
 866                                 parse_vxlan_gpe(udp_hdr, &info);
 867                                 if (info.is_tunnel) {
 868                                         tx_ol_flags |=
 869                                                 PKT_TX_TUNNEL_VXLAN_GPE;
 870                                         goto tunnel_update;
 871                                 }
 872                                 parse_vxlan(udp_hdr, &info,
 873                                             m->packet_type);
 874                                 if (info.is_tunnel)
 875                                         tx_ol_flags |=
 876                                                 PKT_TX_TUNNEL_VXLAN;
 877                         } else if (info.l4_proto == IPPROTO_GRE) {
 878                                 struct simple_gre_hdr *gre_hdr;
 879
 880                                 gre_hdr = (struct simple_gre_hdr *)
 881                                         ((char *)l3_hdr + info.l3_len);
 882                                 parse_gre(gre_hdr, &info);
 883                                 if (info.is_tunnel)
 884                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 885                         } else if (info.l4_proto == IPPROTO_IPIP) {
 886                                 void *encap_ip_hdr;
 887
 888                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 889                                 parse_encap_ip(encap_ip_hdr, &info);
 890                                 if (info.is_tunnel)
 891                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 892                         }
 893                 }
 894
 895 tunnel_update:
 896                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 897                 if (info.is_tunnel) {
 898                         outer_l3_hdr = l3_hdr;
 899                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 900                 }
 901
 902                 /* step 2: depending on user command line configuration,
 903                  * recompute checksum either in software or flag the
 904                  * mbuf to offload the calculation to the NIC. If TSO
 905                  * is configured, prepare the mbuf for TCP segmentation. */
 906
 907                 /* process checksums of inner headers first */
 908                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 909                         tx_offloads);
 910
 911                 /* Then process outer headers if any. Note that the software
 912                  * checksum will be wrong if one of the inner checksums is
 913                  * processed in hardware. */
 914                 if (info.is_tunnel == 1) {
 915                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 916                                         tx_offloads,
 917                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 918                 }
 919
 920                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 921
 922                 m->tx_offload = 0;
 923                 if (info.is_tunnel == 1) {
 924                         if (info.tunnel_tso_segsz ||
 925                             (tx_offloads &
 926                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 927                             (tx_offloads &
 928                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 929                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 930                                 m->outer_l2_len = info.outer_l2_len;
 931                                 m->outer_l3_len = info.outer_l3_len;
 932                                 m->l2_len = info.l2_len;
 933                                 m->l3_len = info.l3_len;
 934                                 m->l4_len = info.l4_len;
 935                                 m->tso_segsz = info.tunnel_tso_segsz;
 936                         }
 937                         else {
 938                                 /* if there is a outer UDP cksum
 939                                    processed in sw and the inner in hw,
 940                                    the outer checksum will be wrong as
 941                                    the payload will be modified by the
 942                                    hardware */
 943                                 m->l2_len = info.outer_l2_len +
 944                                         info.outer_l3_len + info.l2_len;
 945                                 m->l3_len = info.l3_len;
 946                                 m->l4_len = info.l4_len;
 947                         }
 948                 } else {
 949                         /* this is only useful if an offload flag is
 950                          * set, but it does not hurt to fill it in any
 951                          * case */
 952                         m->l2_len = info.l2_len;
 953                         m->l3_len = info.l3_len;
 954                         m->l4_len = info.l4_len;
 955                         m->tso_segsz = info.tso_segsz;
 956                 }
 957                 m->ol_flags = tx_ol_flags;
 958
 959                 /* Do split & copy for the packet. */
 960                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 961                         p = pkt_copy_split(m);
 962                         if (p != NULL) {
 963                                 rte_pktmbuf_free(m);
 964                                 m = p;
 965                                 pkts_burst[i] = m;
 966                         }
 967                 }
 968
 969                 /* if verbose mode is enabled, dump debug info */
 970                 if (verbose_level > 0) {
 971                         char buf[256];
 972
 973                         printf("-----------------\n");
 974                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 975                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 976                         /* dump rx parsed packet info */
 977                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 978                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 979                                 "l4_proto=%d l4_len=%d flags=%s\n",
 980                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 981                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 982                         if (rx_ol_flags & PKT_RX_LRO)
 983                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 984                         if (info.is_tunnel == 1)
 985                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 986                                         "outer_l3_len=%d\n", info.outer_l2_len,
 987                                         rte_be_to_cpu_16(info.outer_ethertype),
 988                                         info.outer_l3_len);
 989                         /* dump tx packet info */
 990                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 991                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 992                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 993                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 994                                 info.tso_segsz != 0)
 995                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 996                                         "m->l4_len=%d\n",
 997                                         m->l2_len, m->l3_len, m->l4_len);
 998                         if (info.is_tunnel == 1) {
 999                                 if ((tx_offloads &
1000                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
1001                                     (tx_offloads &
1002                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
1003                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
1004                                         printf("tx: m->outer_l2_len=%d "
1005                                                 "m->outer_l3_len=%d\n",
1006                                                 m->outer_l2_len,
1007                                                 m->outer_l3_len);
1008                                 if (info.tunnel_tso_segsz != 0 &&
1009                                                 (m->ol_flags & PKT_TX_TCP_SEG))
1010                                         printf("tx: m->tso_segsz=%d\n",
1011                                                 m->tso_segsz);
1012                         } else if (info.tso_segsz != 0 &&
1013                                         (m->ol_flags & PKT_TX_TCP_SEG))
1014                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
1015                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
1016                         printf("tx: flags=%s", buf);
1017                         printf("\n");
1018                 }
1019         }
1020
1021         if (unlikely(gro_enable)) {
1022                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
1023                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
1024                                         &(gro_ports[fs->rx_port].param));
1025                 } else {
1026                         gro_ctx = current_fwd_lcore()->gro_ctx;
1027                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
1028
1029                         if (++fs->gro_times >= gro_flush_cycles) {
1030                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
1031                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
1032                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
1033
1034                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
1035                                                 RTE_GRO_TCP_IPV4,
1036                                                 &pkts_burst[nb_rx],
1037                                                 gro_pkts_num);
1038                                 fs->gro_times = 0;
1039                         }
1040                 }
1041         }
1042
1043         if (gso_ports[fs->tx_port].enable == 0)
1044                 tx_pkts_burst = pkts_burst;
1045         else {
1046                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
1047                 gso_ctx->gso_size = gso_max_segment_size;
1048                 for (i = 0; i < nb_rx; i++) {
1049                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
1050                                         &gso_segments[nb_segments],
1051                                         GSO_MAX_PKT_BURST - nb_segments);
1052                         if (ret >= 0)
1053                                 nb_segments += ret;
1054                         else {
1055                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
1056                                 rte_pktmbuf_free(pkts_burst[i]);
1057                         }
1058                 }
1059
1060                 tx_pkts_burst = gso_segments;
1061                 nb_rx = nb_segments;
1062         }
1063
1064         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
1065                         tx_pkts_burst, nb_rx);
1066         if (nb_prep != nb_rx)
1067                 printf("Preparing packet burst to transmit failed: %s\n",
1068                                 rte_strerror(rte_errno));
1069
1070         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
1071                         nb_prep);
1072
1073         /*
1074          * Retry if necessary
1075          */
1076         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
1077                 retry = 0;
1078                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
1079                         rte_delay_us(burst_tx_delay_time);
1080                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
1081                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
1082                 }
1083         }
1084         fs->tx_packets += nb_tx;
1085         fs->rx_bad_ip_csum += rx_bad_ip_csum;
1086         fs->rx_bad_l4_csum += rx_bad_l4_csum;
1087         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
1088
1089 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1090         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1091 #endif
1092         if (unlikely(nb_tx < nb_rx)) {
1093                 fs->fwd_dropped += (nb_rx - nb_tx);
1094                 do {
1095                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1096                 } while (++nb_tx < nb_rx);
1097         }
1098
1099 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1100         end_tsc = rte_rdtsc();
1101         core_cycles = (end_tsc - start_tsc);
1102         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1103 #endif
1104 }
1105
1106 struct fwd_engine csum_fwd_engine = {
1107         .fwd_mode_name  = "csum",
1108         .port_fwd_begin = NULL,
1109         .port_fwd_end   = NULL,
1110         .packet_fwd     = pkt_burst_checksum_forward,
1111 };