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
  51 #define GRE_CHECKSUM_PRESENT    0x8000
  52 #define GRE_KEY_PRESENT         0x2000
  53 #define GRE_SEQUENCE_PRESENT    0x1000
  54 #define GRE_EXT_LEN             4
  55 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  56                                  GRE_SEQUENCE_PRESENT)
  57
  58 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  59 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  60 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  61 #else
  62 #define _htons(x) (x)
  63 #endif
  64
  65 uint16_t vxlan_gpe_udp_port = 4790;
  66
  67 /* structure that caches offload info for the current packet */
  68 struct testpmd_offload_info {
  69         uint16_t ethertype;
  70         uint8_t gso_enable;
  71         uint16_t l2_len;
  72         uint16_t l3_len;
  73         uint16_t l4_len;
  74         uint8_t l4_proto;
  75         uint8_t is_tunnel;
  76         uint16_t outer_ethertype;
  77         uint16_t outer_l2_len;
  78         uint16_t outer_l3_len;
  79         uint8_t outer_l4_proto;
  80         uint16_t tso_segsz;
  81         uint16_t tunnel_tso_segsz;
  82         uint32_t pkt_len;
  83 };
  84
  85 /* simplified GRE header */
  86 struct simple_gre_hdr {
  87         uint16_t flags;
  88         uint16_t proto;
  89 } __rte_packed;
  90
  91 static uint16_t
  92 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  93 {
  94         if (ethertype == _htons(RTE_ETHER_TYPE_IPV4))
  95                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  96         else /* assume ethertype == RTE_ETHER_TYPE_IPV6 */
  97                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
  98 }
  99
 100 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 101 static void
 102 parse_ipv4(struct rte_ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 103 {
 104         struct rte_tcp_hdr *tcp_hdr;
 105
 106         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 107         info->l4_proto = ipv4_hdr->next_proto_id;
 108
 109         /* only fill l4_len for TCP, it's useful for TSO */
 110         if (info->l4_proto == IPPROTO_TCP) {
 111                 tcp_hdr = (struct rte_tcp_hdr *)
 112                         ((char *)ipv4_hdr + info->l3_len);
 113                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 114         } else if (info->l4_proto == IPPROTO_UDP)
 115                 info->l4_len = sizeof(struct rte_udp_hdr);
 116         else
 117                 info->l4_len = 0;
 118 }
 119
 120 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
 121 static void
 122 parse_ipv6(struct rte_ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 123 {
 124         struct rte_tcp_hdr *tcp_hdr;
 125
 126         info->l3_len = sizeof(struct rte_ipv6_hdr);
 127         info->l4_proto = ipv6_hdr->proto;
 128
 129         /* only fill l4_len for TCP, it's useful for TSO */
 130         if (info->l4_proto == IPPROTO_TCP) {
 131                 tcp_hdr = (struct rte_tcp_hdr *)
 132                         ((char *)ipv6_hdr + info->l3_len);
 133                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 134         } else if (info->l4_proto == IPPROTO_UDP)
 135                 info->l4_len = sizeof(struct rte_udp_hdr);
 136         else
 137                 info->l4_len = 0;
 138 }
 139
 140 /*
 141  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 142  * ipproto. This function is able to recognize IPv4/IPv6 with optional VLAN
 143  * headers. The l4_len argument is only set in case of TCP (useful for TSO).
 144  */
 145 static void
 146 parse_ethernet(struct rte_ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 147 {
 148         struct rte_ipv4_hdr *ipv4_hdr;
 149         struct rte_ipv6_hdr *ipv6_hdr;
 150         struct rte_vlan_hdr *vlan_hdr;
 151
 152         info->l2_len = sizeof(struct rte_ether_hdr);
 153         info->ethertype = eth_hdr->ether_type;
 154
 155         while (info->ethertype == _htons(RTE_ETHER_TYPE_VLAN) ||
 156                info->ethertype == _htons(RTE_ETHER_TYPE_QINQ)) {
 157                 vlan_hdr = (struct rte_vlan_hdr *)
 158                         ((char *)eth_hdr + info->l2_len);
 159                 info->l2_len  += sizeof(struct rte_vlan_hdr);
 160                 info->ethertype = vlan_hdr->eth_proto;
 161         }
 162
 163         switch (info->ethertype) {
 164         case _htons(RTE_ETHER_TYPE_IPV4):
 165                 ipv4_hdr = (struct rte_ipv4_hdr *)
 166                         ((char *)eth_hdr + info->l2_len);
 167                 parse_ipv4(ipv4_hdr, info);
 168                 break;
 169         case _htons(RTE_ETHER_TYPE_IPV6):
 170                 ipv6_hdr = (struct rte_ipv6_hdr *)
 171                         ((char *)eth_hdr + info->l2_len);
 172                 parse_ipv6(ipv6_hdr, info);
 173                 break;
 174         default:
 175                 info->l4_len = 0;
 176                 info->l3_len = 0;
 177                 info->l4_proto = 0;
 178                 break;
 179         }
 180 }
 181
 182 /*
 183  * Parse a GTP protocol header.
 184  * No optional fields and next extension header type.
 185  */
 186 static void
 187 parse_gtp(struct rte_udp_hdr *udp_hdr,
 188           struct testpmd_offload_info *info)
 189 {
 190         struct rte_ipv4_hdr *ipv4_hdr;
 191         struct rte_ipv6_hdr *ipv6_hdr;
 192         struct rte_gtp_hdr *gtp_hdr;
 193         uint8_t gtp_len = sizeof(*gtp_hdr);
 194         uint8_t ip_ver;
 195
 196         /* Check udp destination port. */
 197         if (udp_hdr->dst_port != _htons(RTE_GTPC_UDP_PORT) &&
 198             udp_hdr->src_port != _htons(RTE_GTPC_UDP_PORT) &&
 199             udp_hdr->dst_port != _htons(RTE_GTPU_UDP_PORT))
 200                 return;
 201
 202         info->is_tunnel = 1;
 203         info->outer_ethertype = info->ethertype;
 204         info->outer_l2_len = info->l2_len;
 205         info->outer_l3_len = info->l3_len;
 206         info->outer_l4_proto = info->l4_proto;
 207         info->l2_len = 0;
 208
 209         gtp_hdr = (struct rte_gtp_hdr *)((char *)udp_hdr +
 210                   sizeof(struct rte_udp_hdr));
 211
 212         /*
 213          * Check message type. If message type is 0xff, it is
 214          * a GTP data packet. If not, it is a GTP control packet
 215          */
 216         if (gtp_hdr->msg_type == 0xff) {
 217                 ip_ver = *(uint8_t *)((char *)udp_hdr +
 218                          sizeof(struct rte_udp_hdr) +
 219                          sizeof(struct rte_gtp_hdr));
 220                 ip_ver = (ip_ver) & 0xf0;
 221
 222                 if (ip_ver == RTE_GTP_TYPE_IPV4) {
 223                         ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gtp_hdr +
 224                                    gtp_len);
 225                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 226                         parse_ipv4(ipv4_hdr, info);
 227                 } else if (ip_ver == RTE_GTP_TYPE_IPV6) {
 228                         ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gtp_hdr +
 229                                    gtp_len);
 230                         info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 231                         parse_ipv6(ipv6_hdr, info);
 232                 }
 233         } else {
 234                 info->ethertype = 0;
 235                 info->l4_len = 0;
 236                 info->l3_len = 0;
 237                 info->l4_proto = 0;
 238         }
 239
 240         info->l2_len += RTE_ETHER_GTP_HLEN;
 241 }
 242
 243 /* Parse a vxlan header */
 244 static void
 245 parse_vxlan(struct rte_udp_hdr *udp_hdr,
 246             struct testpmd_offload_info *info,
 247             uint32_t pkt_type)
 248 {
 249         struct rte_ether_hdr *eth_hdr;
 250
 251         /* check udp destination port, 4789 is the default vxlan port
 252          * (rfc7348) or that the rx offload flag is set (i40e only
 253          * currently) */
 254         if (udp_hdr->dst_port != _htons(4789) &&
 255                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 256                 return;
 257
 258         info->is_tunnel = 1;
 259         info->outer_ethertype = info->ethertype;
 260         info->outer_l2_len = info->l2_len;
 261         info->outer_l3_len = info->l3_len;
 262         info->outer_l4_proto = info->l4_proto;
 263
 264         eth_hdr = (struct rte_ether_hdr *)((char *)udp_hdr +
 265                 sizeof(struct rte_udp_hdr) +
 266                 sizeof(struct rte_vxlan_hdr));
 267
 268         parse_ethernet(eth_hdr, info);
 269         info->l2_len += RTE_ETHER_VXLAN_HLEN; /* add udp + vxlan */
 270 }
 271
 272 /* Parse a vxlan-gpe header */
 273 static void
 274 parse_vxlan_gpe(struct rte_udp_hdr *udp_hdr,
 275             struct testpmd_offload_info *info)
 276 {
 277         struct rte_ether_hdr *eth_hdr;
 278         struct rte_ipv4_hdr *ipv4_hdr;
 279         struct rte_ipv6_hdr *ipv6_hdr;
 280         struct rte_vxlan_gpe_hdr *vxlan_gpe_hdr;
 281         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 282
 283         /* Check udp destination port. */
 284         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 285                 return;
 286
 287         vxlan_gpe_hdr = (struct rte_vxlan_gpe_hdr *)((char *)udp_hdr +
 288                                 sizeof(struct rte_udp_hdr));
 289
 290         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 291             RTE_VXLAN_GPE_TYPE_IPV4) {
 292                 info->is_tunnel = 1;
 293                 info->outer_ethertype = info->ethertype;
 294                 info->outer_l2_len = info->l2_len;
 295                 info->outer_l3_len = info->l3_len;
 296                 info->outer_l4_proto = info->l4_proto;
 297
 298                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)vxlan_gpe_hdr +
 299                            vxlan_gpe_len);
 300
 301                 parse_ipv4(ipv4_hdr, info);
 302                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 303                 info->l2_len = 0;
 304
 305         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_IPV6) {
 306                 info->is_tunnel = 1;
 307                 info->outer_ethertype = info->ethertype;
 308                 info->outer_l2_len = info->l2_len;
 309                 info->outer_l3_len = info->l3_len;
 310                 info->outer_l4_proto = info->l4_proto;
 311
 312                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)vxlan_gpe_hdr +
 313                            vxlan_gpe_len);
 314
 315                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 316                 parse_ipv6(ipv6_hdr, info);
 317                 info->l2_len = 0;
 318
 319         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_ETH) {
 320                 info->is_tunnel = 1;
 321                 info->outer_ethertype = info->ethertype;
 322                 info->outer_l2_len = info->l2_len;
 323                 info->outer_l3_len = info->l3_len;
 324                 info->outer_l4_proto = info->l4_proto;
 325
 326                 eth_hdr = (struct rte_ether_hdr *)((char *)vxlan_gpe_hdr +
 327                           vxlan_gpe_len);
 328
 329                 parse_ethernet(eth_hdr, info);
 330         } else
 331                 return;
 332
 333         info->l2_len += RTE_ETHER_VXLAN_GPE_HLEN;
 334 }
 335
 336 /* Parse a gre header */
 337 static void
 338 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 339 {
 340         struct rte_ether_hdr *eth_hdr;
 341         struct rte_ipv4_hdr *ipv4_hdr;
 342         struct rte_ipv6_hdr *ipv6_hdr;
 343         uint8_t gre_len = 0;
 344
 345         gre_len += sizeof(struct simple_gre_hdr);
 346
 347         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 348                 gre_len += GRE_EXT_LEN;
 349         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 350                 gre_len += GRE_EXT_LEN;
 351         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 352                 gre_len += GRE_EXT_LEN;
 353
 354         if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV4)) {
 355                 info->is_tunnel = 1;
 356                 info->outer_ethertype = info->ethertype;
 357                 info->outer_l2_len = info->l2_len;
 358                 info->outer_l3_len = info->l3_len;
 359                 info->outer_l4_proto = info->l4_proto;
 360
 361                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)gre_hdr + gre_len);
 362
 363                 parse_ipv4(ipv4_hdr, info);
 364                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 365                 info->l2_len = 0;
 366
 367         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPV6)) {
 368                 info->is_tunnel = 1;
 369                 info->outer_ethertype = info->ethertype;
 370                 info->outer_l2_len = info->l2_len;
 371                 info->outer_l3_len = info->l3_len;
 372                 info->outer_l4_proto = info->l4_proto;
 373
 374                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gre_hdr + gre_len);
 375
 376                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 377                 parse_ipv6(ipv6_hdr, info);
 378                 info->l2_len = 0;
 379
 380         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_TEB)) {
 381                 info->is_tunnel = 1;
 382                 info->outer_ethertype = info->ethertype;
 383                 info->outer_l2_len = info->l2_len;
 384                 info->outer_l3_len = info->l3_len;
 385                 info->outer_l4_proto = info->l4_proto;
 386
 387                 eth_hdr = (struct rte_ether_hdr *)((char *)gre_hdr + gre_len);
 388
 389                 parse_ethernet(eth_hdr, info);
 390         } else
 391                 return;
 392
 393         info->l2_len += gre_len;
 394 }
 395
 396
 397 /* Parse an encapsulated ip or ipv6 header */
 398 static void
 399 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 400 {
 401         struct rte_ipv4_hdr *ipv4_hdr = encap_ip;
 402         struct rte_ipv6_hdr *ipv6_hdr = encap_ip;
 403         uint8_t ip_version;
 404
 405         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 406
 407         if (ip_version != 4 && ip_version != 6)
 408                 return;
 409
 410         info->is_tunnel = 1;
 411         info->outer_ethertype = info->ethertype;
 412         info->outer_l2_len = info->l2_len;
 413         info->outer_l3_len = info->l3_len;
 414
 415         if (ip_version == 4) {
 416                 parse_ipv4(ipv4_hdr, info);
 417                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
 418         } else {
 419                 parse_ipv6(ipv6_hdr, info);
 420                 info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
 421         }
 422         info->l2_len = 0;
 423 }
 424
 425 /* if possible, calculate the checksum of a packet in hw or sw,
 426  * depending on the testpmd command line configuration */
 427 static uint64_t
 428 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 429         uint64_t tx_offloads)
 430 {
 431         struct rte_ipv4_hdr *ipv4_hdr = l3_hdr;
 432         struct rte_udp_hdr *udp_hdr;
 433         struct rte_tcp_hdr *tcp_hdr;
 434         struct rte_sctp_hdr *sctp_hdr;
 435         uint64_t ol_flags = 0;
 436         uint32_t max_pkt_len, tso_segsz = 0;
 437
 438         /* ensure packet is large enough to require tso */
 439         if (!info->is_tunnel) {
 440                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 441                         info->tso_segsz;
 442                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 443                         tso_segsz = info->tso_segsz;
 444         } else {
 445                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 446                         info->l2_len + info->l3_len + info->l4_len +
 447                         info->tunnel_tso_segsz;
 448                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 449                         tso_segsz = info->tunnel_tso_segsz;
 450         }
 451
 452         if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 453                 ipv4_hdr = l3_hdr;
 454                 ipv4_hdr->hdr_checksum = 0;
 455
 456                 ol_flags |= PKT_TX_IPV4;
 457                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 458                         ol_flags |= PKT_TX_IP_CKSUM;
 459                 } else {
 460                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 461                                 ol_flags |= PKT_TX_IP_CKSUM;
 462                         else
 463                                 ipv4_hdr->hdr_checksum =
 464                                         rte_ipv4_cksum(ipv4_hdr);
 465                 }
 466         } else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV6))
 467                 ol_flags |= PKT_TX_IPV6;
 468         else
 469                 return 0; /* packet type not supported, nothing to do */
 470
 471         if (info->l4_proto == IPPROTO_UDP) {
 472                 udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len);
 473                 /* do not recalculate udp cksum if it was 0 */
 474                 if (udp_hdr->dgram_cksum != 0) {
 475                         udp_hdr->dgram_cksum = 0;
 476                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 477                                 ol_flags |= PKT_TX_UDP_CKSUM;
 478                         else {
 479                                 udp_hdr->dgram_cksum =
 480                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 481                                                 info->ethertype);
 482                         }
 483                 }
 484                 if (info->gso_enable)
 485                         ol_flags |= PKT_TX_UDP_SEG;
 486         } else if (info->l4_proto == IPPROTO_TCP) {
 487                 tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
 488                 tcp_hdr->cksum = 0;
 489                 if (tso_segsz)
 490                         ol_flags |= PKT_TX_TCP_SEG;
 491                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 492                         ol_flags |= PKT_TX_TCP_CKSUM;
 493                 else {
 494                         tcp_hdr->cksum =
 495                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 496                                         info->ethertype);
 497                 }
 498                 if (info->gso_enable)
 499                         ol_flags |= PKT_TX_TCP_SEG;
 500         } else if (info->l4_proto == IPPROTO_SCTP) {
 501                 sctp_hdr = (struct rte_sctp_hdr *)
 502                         ((char *)l3_hdr + info->l3_len);
 503                 sctp_hdr->cksum = 0;
 504                 /* sctp payload must be a multiple of 4 to be
 505                  * offloaded */
 506                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 507                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 508                         ol_flags |= PKT_TX_SCTP_CKSUM;
 509                 } else {
 510                         /* XXX implement CRC32c, example available in
 511                          * RFC3309 */
 512                 }
 513         }
 514
 515         return ol_flags;
 516 }
 517
 518 /* Calculate the checksum of outer header */
 519 static uint64_t
 520 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 521         uint64_t tx_offloads, int tso_enabled)
 522 {
 523         struct rte_ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 524         struct rte_ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 525         struct rte_udp_hdr *udp_hdr;
 526         uint64_t ol_flags = 0;
 527
 528         if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4)) {
 529                 ipv4_hdr->hdr_checksum = 0;
 530                 ol_flags |= PKT_TX_OUTER_IPV4;
 531
 532                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 533                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 534                 else
 535                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 536         } else
 537                 ol_flags |= PKT_TX_OUTER_IPV6;
 538
 539         if (info->outer_l4_proto != IPPROTO_UDP)
 540                 return ol_flags;
 541
 542         udp_hdr = (struct rte_udp_hdr *)
 543                 ((char *)outer_l3_hdr + info->outer_l3_len);
 544
 545         if (tso_enabled)
 546                 ol_flags |= PKT_TX_TCP_SEG;
 547
 548         /* Skip SW outer UDP checksum generation if HW supports it */
 549         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 550                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 551                         udp_hdr->dgram_cksum
 552                                 = rte_ipv4_phdr_cksum(ipv4_hdr, ol_flags);
 553                 else
 554                         udp_hdr->dgram_cksum
 555                                 = rte_ipv6_phdr_cksum(ipv6_hdr, ol_flags);
 556
 557                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 558                 return ol_flags;
 559         }
 560
 561         /* outer UDP checksum is done in software. In the other side, for
 562          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 563          * set to zero.
 564          *
 565          * If a packet will be TSOed into small packets by NIC, we cannot
 566          * set/calculate a non-zero checksum, because it will be a wrong
 567          * value after the packet be split into several small packets.
 568          */
 569         if (tso_enabled)
 570                 udp_hdr->dgram_cksum = 0;
 571
 572         /* do not recalculate udp cksum if it was 0 */
 573         if (udp_hdr->dgram_cksum != 0) {
 574                 udp_hdr->dgram_cksum = 0;
 575                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPV4))
 576                         udp_hdr->dgram_cksum =
 577                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 578                 else
 579                         udp_hdr->dgram_cksum =
 580                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 581         }
 582
 583         return ol_flags;
 584 }
 585
 586 /*
 587  * Helper function.
 588  * Performs actual copying.
 589  * Returns number of segments in the destination mbuf on success,
 590  * or negative error code on failure.
 591  */
 592 static int
 593 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 594         uint16_t seglen[], uint8_t nb_seg)
 595 {
 596         uint32_t dlen, slen, tlen;
 597         uint32_t i, len;
 598         const struct rte_mbuf *m;
 599         const uint8_t *src;
 600         uint8_t *dst;
 601
 602         dlen = 0;
 603         slen = 0;
 604         tlen = 0;
 605
 606         dst = NULL;
 607         src = NULL;
 608
 609         m = ms;
 610         i = 0;
 611         while (ms != NULL && i != nb_seg) {
 612
 613                 if (slen == 0) {
 614                         slen = rte_pktmbuf_data_len(ms);
 615                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 616                 }
 617
 618                 if (dlen == 0) {
 619                         dlen = RTE_MIN(seglen[i], slen);
 620                         md[i]->data_len = dlen;
 621                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 622                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 623                 }
 624
 625                 len = RTE_MIN(slen, dlen);
 626                 memcpy(dst, src, len);
 627                 tlen += len;
 628                 slen -= len;
 629                 dlen -= len;
 630                 src += len;
 631                 dst += len;
 632
 633                 if (slen == 0)
 634                         ms = ms->next;
 635                 if (dlen == 0)
 636                         i++;
 637         }
 638
 639         if (ms != NULL)
 640                 return -ENOBUFS;
 641         else if (tlen != m->pkt_len)
 642                 return -EINVAL;
 643
 644         md[0]->nb_segs = nb_seg;
 645         md[0]->pkt_len = tlen;
 646         md[0]->vlan_tci = m->vlan_tci;
 647         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 648         md[0]->ol_flags = m->ol_flags;
 649         md[0]->tx_offload = m->tx_offload;
 650
 651         return nb_seg;
 652 }
 653
 654 /*
 655  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 656  * Copy packet contents and offload information into the new segmented mbuf.
 657  */
 658 static struct rte_mbuf *
 659 pkt_copy_split(const struct rte_mbuf *pkt)
 660 {
 661         int32_t n, rc;
 662         uint32_t i, len, nb_seg;
 663         struct rte_mempool *mp;
 664         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 665         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 666
 667         mp = current_fwd_lcore()->mbp;
 668
 669         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 670                 nb_seg = random() % tx_pkt_nb_segs + 1;
 671         else
 672                 nb_seg = tx_pkt_nb_segs;
 673
 674         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 675
 676         /* calculate number of segments to use and their length. */
 677         len = 0;
 678         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 679                 len += seglen[i];
 680                 md[i] = NULL;
 681         }
 682
 683         n = pkt->pkt_len - len;
 684
 685         /* update size of the last segment to fit rest of the packet */
 686         if (n >= 0) {
 687                 seglen[i - 1] += n;
 688                 len += n;
 689         }
 690
 691         nb_seg = i;
 692         while (i != 0) {
 693                 p = rte_pktmbuf_alloc(mp);
 694                 if (p == NULL) {
 695                         TESTPMD_LOG(ERR,
 696                                 "failed to allocate %u-th of %u mbuf "
 697                                 "from mempool: %s\n",
 698                                 nb_seg - i, nb_seg, mp->name);
 699                         break;
 700                 }
 701
 702                 md[--i] = p;
 703                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 704                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 705                                 "expected seglen: %u, "
 706                                 "actual mbuf tailroom: %u\n",
 707                                 mp->name, i, seglen[i],
 708                                 rte_pktmbuf_tailroom(md[i]));
 709                         break;
 710                 }
 711         }
 712
 713         /* all mbufs successfully allocated, do copy */
 714         if (i == 0) {
 715                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 716                 if (rc < 0)
 717                         TESTPMD_LOG(ERR,
 718                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 719                                 "into %u segments failed with error code: %d\n",
 720                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 721
 722                 /* figure out how many mbufs to free. */
 723                 i = RTE_MAX(rc, 0);
 724         }
 725
 726         /* free unused mbufs */
 727         for (; i != nb_seg; i++) {
 728                 rte_pktmbuf_free_seg(md[i]);
 729                 md[i] = NULL;
 730         }
 731
 732         return md[0];
 733 }
 734
 735 /*
 736  * Receive a burst of packets, and for each packet:
 737  *  - parse packet, and try to recognize a supported packet type (1)
 738  *  - if it's not a supported packet type, don't touch the packet, else:
 739  *  - reprocess the checksum of all supported layers. This is done in SW
 740  *    or HW, depending on testpmd command line configuration
 741  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 742  *    segmentation offload (this implies HW TCP checksum)
 743  * Then transmit packets on the output port.
 744  *
 745  * (1) Supported packets are:
 746  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 747  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 748  *           UDP|TCP|SCTP
 749  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 750  *           UDP|TCP|SCTP
 751  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 752  *           UDP|TCP|SCTP
 753  *   Ether / (vlan) / outer IP / outer UDP / GTP / IP|IP6 / UDP|TCP|SCTP
 754  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 755  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 756  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 757  *
 758  * The testpmd command line for this forward engine sets the flags
 759  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 760  * wether a checksum must be calculated in software or in hardware. The
 761  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 762  * OUTER_IP is only useful for tunnel packets.
 763  */
 764 static void
 765 pkt_burst_checksum_forward(struct fwd_stream *fs)
 766 {
 767         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 768         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 769         struct rte_gso_ctx *gso_ctx;
 770         struct rte_mbuf **tx_pkts_burst;
 771         struct rte_port *txp;
 772         struct rte_mbuf *m, *p;
 773         struct rte_ether_hdr *eth_hdr;
 774         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 775         void **gro_ctx;
 776         uint16_t gro_pkts_num;
 777         uint8_t gro_enable;
 778         uint16_t nb_rx;
 779         uint16_t nb_tx;
 780         uint16_t nb_prep;
 781         uint16_t i;
 782         uint64_t rx_ol_flags, tx_ol_flags;
 783         uint64_t tx_offloads;
 784         uint32_t retry;
 785         uint32_t rx_bad_ip_csum;
 786         uint32_t rx_bad_l4_csum;
 787         uint32_t rx_bad_outer_l4_csum;
 788         struct testpmd_offload_info info;
 789         uint16_t nb_segments = 0;
 790         int ret;
 791
 792 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 793         uint64_t start_tsc;
 794         uint64_t end_tsc;
 795         uint64_t core_cycles;
 796 #endif
 797
 798 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 799         start_tsc = rte_rdtsc();
 800 #endif
 801
 802         /* receive a burst of packet */
 803         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 804                                  nb_pkt_per_burst);
 805         if (unlikely(nb_rx == 0))
 806                 return;
 807 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 808         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 809 #endif
 810         fs->rx_packets += nb_rx;
 811         rx_bad_ip_csum = 0;
 812         rx_bad_l4_csum = 0;
 813         rx_bad_outer_l4_csum = 0;
 814         gro_enable = gro_ports[fs->rx_port].enable;
 815
 816         txp = &ports[fs->tx_port];
 817         tx_offloads = txp->dev_conf.txmode.offloads;
 818         memset(&info, 0, sizeof(info));
 819         info.tso_segsz = txp->tso_segsz;
 820         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 821         if (gso_ports[fs->tx_port].enable)
 822                 info.gso_enable = 1;
 823
 824         for (i = 0; i < nb_rx; i++) {
 825                 if (likely(i < nb_rx - 1))
 826                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 827                                                        void *));
 828
 829                 m = pkts_burst[i];
 830                 info.is_tunnel = 0;
 831                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 832                 tx_ol_flags = m->ol_flags &
 833                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 834                 rx_ol_flags = m->ol_flags;
 835
 836                 /* Update the L3/L4 checksum error packet statistics */
 837                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 838                         rx_bad_ip_csum += 1;
 839                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 840                         rx_bad_l4_csum += 1;
 841                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 842                         rx_bad_outer_l4_csum += 1;
 843
 844                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 845                  * and inner headers */
 846
 847                 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 848                 rte_ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 849                                 &eth_hdr->d_addr);
 850                 rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
 851                                 &eth_hdr->s_addr);
 852                 parse_ethernet(eth_hdr, &info);
 853                 l3_hdr = (char *)eth_hdr + info.l2_len;
 854
 855                 /* check if it's a supported tunnel */
 856                 if (txp->parse_tunnel) {
 857                         if (info.l4_proto == IPPROTO_UDP) {
 858                                 struct rte_udp_hdr *udp_hdr;
 859
 860                                 udp_hdr = (struct rte_udp_hdr *)
 861                                         ((char *)l3_hdr + info.l3_len);
 862                                 parse_gtp(udp_hdr, &info);
 863                                 if (info.is_tunnel) {
 864                                         tx_ol_flags |= PKT_TX_TUNNEL_GTP;
 865                                         goto tunnel_update;
 866                                 }
 867                                 parse_vxlan_gpe(udp_hdr, &info);
 868                                 if (info.is_tunnel) {
 869                                         tx_ol_flags |=
 870                                                 PKT_TX_TUNNEL_VXLAN_GPE;
 871                                         goto tunnel_update;
 872                                 }
 873                                 parse_vxlan(udp_hdr, &info,
 874                                             m->packet_type);
 875                                 if (info.is_tunnel)
 876                                         tx_ol_flags |=
 877                                                 PKT_TX_TUNNEL_VXLAN;
 878                         } else if (info.l4_proto == IPPROTO_GRE) {
 879                                 struct simple_gre_hdr *gre_hdr;
 880
 881                                 gre_hdr = (struct simple_gre_hdr *)
 882                                         ((char *)l3_hdr + info.l3_len);
 883                                 parse_gre(gre_hdr, &info);
 884                                 if (info.is_tunnel)
 885                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 886                         } else if (info.l4_proto == IPPROTO_IPIP) {
 887                                 void *encap_ip_hdr;
 888
 889                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 890                                 parse_encap_ip(encap_ip_hdr, &info);
 891                                 if (info.is_tunnel)
 892                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 893                         }
 894                 }
 895
 896 tunnel_update:
 897                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 898                 if (info.is_tunnel) {
 899                         outer_l3_hdr = l3_hdr;
 900                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 901                 }
 902
 903                 /* step 2: depending on user command line configuration,
 904                  * recompute checksum either in software or flag the
 905                  * mbuf to offload the calculation to the NIC. If TSO
 906                  * is configured, prepare the mbuf for TCP segmentation. */
 907
 908                 /* process checksums of inner headers first */
 909                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 910                         tx_offloads);
 911
 912                 /* Then process outer headers if any. Note that the software
 913                  * checksum will be wrong if one of the inner checksums is
 914                  * processed in hardware. */
 915                 if (info.is_tunnel == 1) {
 916                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 917                                         tx_offloads,
 918                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 919                 }
 920
 921                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 922
 923                 m->tx_offload = 0;
 924                 if (info.is_tunnel == 1) {
 925                         if (info.tunnel_tso_segsz ||
 926                             (tx_offloads &
 927                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 928                             (tx_offloads &
 929                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 930                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 931                                 m->outer_l2_len = info.outer_l2_len;
 932                                 m->outer_l3_len = info.outer_l3_len;
 933                                 m->l2_len = info.l2_len;
 934                                 m->l3_len = info.l3_len;
 935                                 m->l4_len = info.l4_len;
 936                                 m->tso_segsz = info.tunnel_tso_segsz;
 937                         }
 938                         else {
 939                                 /* if there is a outer UDP cksum
 940                                    processed in sw and the inner in hw,
 941                                    the outer checksum will be wrong as
 942                                    the payload will be modified by the
 943                                    hardware */
 944                                 m->l2_len = info.outer_l2_len +
 945                                         info.outer_l3_len + info.l2_len;
 946                                 m->l3_len = info.l3_len;
 947                                 m->l4_len = info.l4_len;
 948                         }
 949                 } else {
 950                         /* this is only useful if an offload flag is
 951                          * set, but it does not hurt to fill it in any
 952                          * case */
 953                         m->l2_len = info.l2_len;
 954                         m->l3_len = info.l3_len;
 955                         m->l4_len = info.l4_len;
 956                         m->tso_segsz = info.tso_segsz;
 957                 }
 958                 m->ol_flags = tx_ol_flags;
 959
 960                 /* Do split & copy for the packet. */
 961                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 962                         p = pkt_copy_split(m);
 963                         if (p != NULL) {
 964                                 rte_pktmbuf_free(m);
 965                                 m = p;
 966                                 pkts_burst[i] = m;
 967                         }
 968                 }
 969
 970                 /* if verbose mode is enabled, dump debug info */
 971                 if (verbose_level > 0) {
 972                         char buf[256];
 973
 974                         printf("-----------------\n");
 975                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 976                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 977                         /* dump rx parsed packet info */
 978                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 979                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 980                                 "l4_proto=%d l4_len=%d flags=%s\n",
 981                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 982                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 983                         if (rx_ol_flags & PKT_RX_LRO)
 984                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 985                         if (info.is_tunnel == 1)
 986                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 987                                         "outer_l3_len=%d\n", info.outer_l2_len,
 988                                         rte_be_to_cpu_16(info.outer_ethertype),
 989                                         info.outer_l3_len);
 990                         /* dump tx packet info */
 991                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 992                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 993                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 994                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 995                                 info.tso_segsz != 0)
 996                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 997                                         "m->l4_len=%d\n",
 998                                         m->l2_len, m->l3_len, m->l4_len);
 999                         if (info.is_tunnel == 1) {
1000                                 if ((tx_offloads &
1001                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
1002                                     (tx_offloads &
1003                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
1004                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
1005                                         printf("tx: m->outer_l2_len=%d "
1006                                                 "m->outer_l3_len=%d\n",
1007                                                 m->outer_l2_len,
1008                                                 m->outer_l3_len);
1009                                 if (info.tunnel_tso_segsz != 0 &&
1010                                                 (m->ol_flags & PKT_TX_TCP_SEG))
1011                                         printf("tx: m->tso_segsz=%d\n",
1012                                                 m->tso_segsz);
1013                         } else if (info.tso_segsz != 0 &&
1014                                         (m->ol_flags & PKT_TX_TCP_SEG))
1015                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
1016                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
1017                         printf("tx: flags=%s", buf);
1018                         printf("\n");
1019                 }
1020         }
1021
1022         if (unlikely(gro_enable)) {
1023                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
1024                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
1025                                         &(gro_ports[fs->rx_port].param));
1026                 } else {
1027                         gro_ctx = current_fwd_lcore()->gro_ctx;
1028                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
1029
1030                         if (++fs->gro_times >= gro_flush_cycles) {
1031                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
1032                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
1033                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
1034
1035                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
1036                                                 RTE_GRO_TCP_IPV4,
1037                                                 &pkts_burst[nb_rx],
1038                                                 gro_pkts_num);
1039                                 fs->gro_times = 0;
1040                         }
1041                 }
1042         }
1043
1044         if (gso_ports[fs->tx_port].enable == 0)
1045                 tx_pkts_burst = pkts_burst;
1046         else {
1047                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
1048                 gso_ctx->gso_size = gso_max_segment_size;
1049                 for (i = 0; i < nb_rx; i++) {
1050                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
1051                                         &gso_segments[nb_segments],
1052                                         GSO_MAX_PKT_BURST - nb_segments);
1053                         if (ret >= 0)
1054                                 nb_segments += ret;
1055                         else {
1056                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
1057                                 rte_pktmbuf_free(pkts_burst[i]);
1058                         }
1059                 }
1060
1061                 tx_pkts_burst = gso_segments;
1062                 nb_rx = nb_segments;
1063         }
1064
1065         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
1066                         tx_pkts_burst, nb_rx);
1067         if (nb_prep != nb_rx)
1068                 printf("Preparing packet burst to transmit failed: %s\n",
1069                                 rte_strerror(rte_errno));
1070
1071         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
1072                         nb_prep);
1073
1074         /*
1075          * Retry if necessary
1076          */
1077         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
1078                 retry = 0;
1079                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
1080                         rte_delay_us(burst_tx_delay_time);
1081                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
1082                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
1083                 }
1084         }
1085         fs->tx_packets += nb_tx;
1086         fs->rx_bad_ip_csum += rx_bad_ip_csum;
1087         fs->rx_bad_l4_csum += rx_bad_l4_csum;
1088         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
1089
1090 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1091         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1092 #endif
1093         if (unlikely(nb_tx < nb_rx)) {
1094                 fs->fwd_dropped += (nb_rx - nb_tx);
1095                 do {
1096                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1097                 } while (++nb_tx < nb_rx);
1098         }
1099
1100 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1101         end_tsc = rte_rdtsc();
1102         core_cycles = (end_tsc - start_tsc);
1103         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1104 #endif
1105 }
1106
1107 struct fwd_engine csum_fwd_engine = {
1108         .fwd_mode_name  = "csum",
1109         .port_fwd_begin = NULL,
1110         .port_fwd_end   = NULL,
1111         .packet_fwd     = pkt_burst_checksum_forward,
1112 };