app/test-pmd/csumonly.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright 2014 6WIND S.A.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12
  13 #include <sys/queue.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_common.h>
  17 #include <rte_byteorder.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_memory.h>
  22 #include <rte_memcpy.h>
  23 #include <rte_launch.h>
  24 #include <rte_eal.h>
  25 #include <rte_per_lcore.h>
  26 #include <rte_lcore.h>
  27 #include <rte_atomic.h>
  28 #include <rte_branch_prediction.h>
  29 #include <rte_mempool.h>
  30 #include <rte_mbuf.h>
  31 #include <rte_interrupts.h>
  32 #include <rte_pci.h>
  33 #include <rte_ether.h>
  34 #include <rte_ethdev.h>
  35 #include <rte_ip.h>
  36 #include <rte_tcp.h>
  37 #include <rte_udp.h>
  38 #include <rte_sctp.h>
  39 #include <rte_prefetch.h>
  40 #include <rte_string_fns.h>
  41 #include <rte_flow.h>
  42 #include <rte_gro.h>
  43 #include <rte_gso.h>
  44
  45 #include "testpmd.h"
  46
  47 #define IP_DEFTTL  64   /* from RFC 1340. */
  48 #define IP_VERSION 0x40
  49 #define IP_HDRLEN  0x05 /* default IP header length == five 32-bits words. */
  50 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
  51
  52 #define GRE_CHECKSUM_PRESENT    0x8000
  53 #define GRE_KEY_PRESENT         0x2000
  54 #define GRE_SEQUENCE_PRESENT    0x1000
  55 #define GRE_EXT_LEN             4
  56 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  57                                  GRE_SEQUENCE_PRESENT)
  58
  59 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  60 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  61 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  62 #else
  63 #define _htons(x) (x)
  64 #endif
  65
  66 uint16_t vxlan_gpe_udp_port = 4790;
  67
  68 /* structure that caches offload info for the current packet */
  69 struct testpmd_offload_info {
  70         uint16_t ethertype;
  71         uint8_t gso_enable;
  72         uint16_t l2_len;
  73         uint16_t l3_len;
  74         uint16_t l4_len;
  75         uint8_t l4_proto;
  76         uint8_t is_tunnel;
  77         uint16_t outer_ethertype;
  78         uint16_t outer_l2_len;
  79         uint16_t outer_l3_len;
  80         uint8_t outer_l4_proto;
  81         uint16_t tso_segsz;
  82         uint16_t tunnel_tso_segsz;
  83         uint32_t pkt_len;
  84 };
  85
  86 /* simplified GRE header */
  87 struct simple_gre_hdr {
  88         uint16_t flags;
  89         uint16_t proto;
  90 } __attribute__((__packed__));
  91
  92 static uint16_t
  93 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  94 {
  95         if (ethertype == _htons(RTE_ETHER_TYPE_IPv4))
  96                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  97         else /* assume ethertype == RTE_ETHER_TYPE_IPv6 */
  98                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
  99 }
 100
 101 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 102 static void
 103 parse_ipv4(struct rte_ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 104 {
 105         struct rte_tcp_hdr *tcp_hdr;
 106
 107         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 108         info->l4_proto = ipv4_hdr->next_proto_id;
 109
 110         /* only fill l4_len for TCP, it's useful for TSO */
 111         if (info->l4_proto == IPPROTO_TCP) {
 112                 tcp_hdr = (struct rte_tcp_hdr *)
 113                         ((char *)ipv4_hdr + info->l3_len);
 114                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 115         } else if (info->l4_proto == IPPROTO_UDP)
 116                 info->l4_len = sizeof(struct udp_hdr);
 117         else
 118                 info->l4_len = 0;
 119 }
 120
 121 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
 122 static void
 123 parse_ipv6(struct rte_ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 124 {
 125         struct rte_tcp_hdr *tcp_hdr;
 126
 127         info->l3_len = sizeof(struct rte_ipv6_hdr);
 128         info->l4_proto = ipv6_hdr->proto;
 129
 130         /* only fill l4_len for TCP, it's useful for TSO */
 131         if (info->l4_proto == IPPROTO_TCP) {
 132                 tcp_hdr = (struct rte_tcp_hdr *)
 133                         ((char *)ipv6_hdr + info->l3_len);
 134                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 135         } else if (info->l4_proto == IPPROTO_UDP)
 136                 info->l4_len = sizeof(struct udp_hdr);
 137         else
 138                 info->l4_len = 0;
 139 }
 140
 141 /*
 142  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 143  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
 144  * header. The l4_len argument is only set in case of TCP (useful for TSO).
 145  */
 146 static void
 147 parse_ethernet(struct rte_ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 148 {
 149         struct rte_ipv4_hdr *ipv4_hdr;
 150         struct rte_ipv6_hdr *ipv6_hdr;
 151
 152         info->l2_len = sizeof(struct rte_ether_hdr);
 153         info->ethertype = eth_hdr->ether_type;
 154
 155         if (info->ethertype == _htons(RTE_ETHER_TYPE_VLAN)) {
 156                 struct rte_vlan_hdr *vlan_hdr = (
 157                         struct rte_vlan_hdr *)(eth_hdr + 1);
 158
 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 /* Parse a vxlan header */
 183 static void
 184 parse_vxlan(struct udp_hdr *udp_hdr,
 185             struct testpmd_offload_info *info,
 186             uint32_t pkt_type)
 187 {
 188         struct rte_ether_hdr *eth_hdr;
 189
 190         /* check udp destination port, 4789 is the default vxlan port
 191          * (rfc7348) or that the rx offload flag is set (i40e only
 192          * currently) */
 193         if (udp_hdr->dst_port != _htons(4789) &&
 194                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 195                 return;
 196
 197         info->is_tunnel = 1;
 198         info->outer_ethertype = info->ethertype;
 199         info->outer_l2_len = info->l2_len;
 200         info->outer_l3_len = info->l3_len;
 201         info->outer_l4_proto = info->l4_proto;
 202
 203         eth_hdr = (struct rte_ether_hdr *)((char *)udp_hdr +
 204                 sizeof(struct udp_hdr) +
 205                 sizeof(struct rte_vxlan_hdr));
 206
 207         parse_ethernet(eth_hdr, info);
 208         info->l2_len += RTE_ETHER_VXLAN_HLEN; /* add udp + vxlan */
 209 }
 210
 211 /* Parse a vxlan-gpe header */
 212 static void
 213 parse_vxlan_gpe(struct udp_hdr *udp_hdr,
 214             struct testpmd_offload_info *info)
 215 {
 216         struct rte_ether_hdr *eth_hdr;
 217         struct rte_ipv4_hdr *ipv4_hdr;
 218         struct rte_ipv6_hdr *ipv6_hdr;
 219         struct rte_vxlan_gpe_hdr *vxlan_gpe_hdr;
 220         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 221
 222         /* Check udp destination port. */
 223         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 224                 return;
 225
 226         vxlan_gpe_hdr = (struct rte_vxlan_gpe_hdr *)((char *)udp_hdr +
 227                                 sizeof(struct udp_hdr));
 228
 229         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 230             RTE_VXLAN_GPE_TYPE_IPV4) {
 231                 info->is_tunnel = 1;
 232                 info->outer_ethertype = info->ethertype;
 233                 info->outer_l2_len = info->l2_len;
 234                 info->outer_l3_len = info->l3_len;
 235                 info->outer_l4_proto = info->l4_proto;
 236
 237                 ipv4_hdr = (struct rte_ipv4_hdr *)((char *)vxlan_gpe_hdr +
 238                            vxlan_gpe_len);
 239
 240                 parse_ipv4(ipv4_hdr, info);
 241                 info->ethertype = _htons(RTE_ETHER_TYPE_IPv4);
 242                 info->l2_len = 0;
 243
 244         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_IPV6) {
 245                 info->is_tunnel = 1;
 246                 info->outer_ethertype = info->ethertype;
 247                 info->outer_l2_len = info->l2_len;
 248                 info->outer_l3_len = info->l3_len;
 249                 info->outer_l4_proto = info->l4_proto;
 250
 251                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)vxlan_gpe_hdr +
 252                            vxlan_gpe_len);
 253
 254                 info->ethertype = _htons(RTE_ETHER_TYPE_IPv6);
 255                 parse_ipv6(ipv6_hdr, info);
 256                 info->l2_len = 0;
 257
 258         } else if (vxlan_gpe_hdr->proto == RTE_VXLAN_GPE_TYPE_ETH) {
 259                 info->is_tunnel = 1;
 260                 info->outer_ethertype = info->ethertype;
 261                 info->outer_l2_len = info->l2_len;
 262                 info->outer_l3_len = info->l3_len;
 263                 info->outer_l4_proto = info->l4_proto;
 264
 265                 eth_hdr = (struct rte_ether_hdr *)((char *)vxlan_gpe_hdr +
 266                           vxlan_gpe_len);
 267
 268                 parse_ethernet(eth_hdr, info);
 269         } else
 270                 return;
 271
 272         info->l2_len += RTE_ETHER_VXLAN_GPE_HLEN;
 273 }
 274
 275 /* Parse a gre header */
 276 static void
 277 parse_gre(struct simple_gre_hdr *gre_hdr, 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         uint8_t gre_len = 0;
 283
 284         gre_len += sizeof(struct simple_gre_hdr);
 285
 286         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 287                 gre_len += GRE_EXT_LEN;
 288         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 289                 gre_len += GRE_EXT_LEN;
 290         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 291                 gre_len += GRE_EXT_LEN;
 292
 293         if (gre_hdr->proto == _htons(RTE_ETHER_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 *)gre_hdr + gre_len);
 301
 302                 parse_ipv4(ipv4_hdr, info);
 303                 info->ethertype = _htons(RTE_ETHER_TYPE_IPv4);
 304                 info->l2_len = 0;
 305
 306         } else if (gre_hdr->proto == _htons(RTE_ETHER_TYPE_IPv6)) {
 307                 info->is_tunnel = 1;
 308                 info->outer_ethertype = info->ethertype;
 309                 info->outer_l2_len = info->l2_len;
 310                 info->outer_l3_len = info->l3_len;
 311                 info->outer_l4_proto = info->l4_proto;
 312
 313                 ipv6_hdr = (struct rte_ipv6_hdr *)((char *)gre_hdr + gre_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 (gre_hdr->proto == _htons(RTE_ETHER_TYPE_TEB)) {
 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 *)gre_hdr + gre_len);
 327
 328                 parse_ethernet(eth_hdr, info);
 329         } else
 330                 return;
 331
 332         info->l2_len += gre_len;
 333 }
 334
 335
 336 /* Parse an encapsulated ip or ipv6 header */
 337 static void
 338 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 339 {
 340         struct rte_ipv4_hdr *ipv4_hdr = encap_ip;
 341         struct rte_ipv6_hdr *ipv6_hdr = encap_ip;
 342         uint8_t ip_version;
 343
 344         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 345
 346         if (ip_version != 4 && ip_version != 6)
 347                 return;
 348
 349         info->is_tunnel = 1;
 350         info->outer_ethertype = info->ethertype;
 351         info->outer_l2_len = info->l2_len;
 352         info->outer_l3_len = info->l3_len;
 353
 354         if (ip_version == 4) {
 355                 parse_ipv4(ipv4_hdr, info);
 356                 info->ethertype = _htons(RTE_ETHER_TYPE_IPv4);
 357         } else {
 358                 parse_ipv6(ipv6_hdr, info);
 359                 info->ethertype = _htons(RTE_ETHER_TYPE_IPv6);
 360         }
 361         info->l2_len = 0;
 362 }
 363
 364 /* if possible, calculate the checksum of a packet in hw or sw,
 365  * depending on the testpmd command line configuration */
 366 static uint64_t
 367 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 368         uint64_t tx_offloads)
 369 {
 370         struct rte_ipv4_hdr *ipv4_hdr = l3_hdr;
 371         struct udp_hdr *udp_hdr;
 372         struct rte_tcp_hdr *tcp_hdr;
 373         struct rte_sctp_hdr *sctp_hdr;
 374         uint64_t ol_flags = 0;
 375         uint32_t max_pkt_len, tso_segsz = 0;
 376
 377         /* ensure packet is large enough to require tso */
 378         if (!info->is_tunnel) {
 379                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 380                         info->tso_segsz;
 381                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 382                         tso_segsz = info->tso_segsz;
 383         } else {
 384                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 385                         info->l2_len + info->l3_len + info->l4_len +
 386                         info->tunnel_tso_segsz;
 387                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 388                         tso_segsz = info->tunnel_tso_segsz;
 389         }
 390
 391         if (info->ethertype == _htons(RTE_ETHER_TYPE_IPv4)) {
 392                 ipv4_hdr = l3_hdr;
 393                 ipv4_hdr->hdr_checksum = 0;
 394
 395                 ol_flags |= PKT_TX_IPV4;
 396                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 397                         ol_flags |= PKT_TX_IP_CKSUM;
 398                 } else {
 399                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 400                                 ol_flags |= PKT_TX_IP_CKSUM;
 401                         else
 402                                 ipv4_hdr->hdr_checksum =
 403                                         rte_ipv4_cksum(ipv4_hdr);
 404                 }
 405         } else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPv6))
 406                 ol_flags |= PKT_TX_IPV6;
 407         else
 408                 return 0; /* packet type not supported, nothing to do */
 409
 410         if (info->l4_proto == IPPROTO_UDP) {
 411                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
 412                 /* do not recalculate udp cksum if it was 0 */
 413                 if (udp_hdr->dgram_cksum != 0) {
 414                         udp_hdr->dgram_cksum = 0;
 415                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 416                                 ol_flags |= PKT_TX_UDP_CKSUM;
 417                         else {
 418                                 udp_hdr->dgram_cksum =
 419                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 420                                                 info->ethertype);
 421                         }
 422                 }
 423                 if (info->gso_enable)
 424                         ol_flags |= PKT_TX_UDP_SEG;
 425         } else if (info->l4_proto == IPPROTO_TCP) {
 426                 tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
 427                 tcp_hdr->cksum = 0;
 428                 if (tso_segsz)
 429                         ol_flags |= PKT_TX_TCP_SEG;
 430                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 431                         ol_flags |= PKT_TX_TCP_CKSUM;
 432                 else {
 433                         tcp_hdr->cksum =
 434                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 435                                         info->ethertype);
 436                 }
 437                 if (info->gso_enable)
 438                         ol_flags |= PKT_TX_TCP_SEG;
 439         } else if (info->l4_proto == IPPROTO_SCTP) {
 440                 sctp_hdr = (struct rte_sctp_hdr *)
 441                         ((char *)l3_hdr + info->l3_len);
 442                 sctp_hdr->cksum = 0;
 443                 /* sctp payload must be a multiple of 4 to be
 444                  * offloaded */
 445                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 446                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 447                         ol_flags |= PKT_TX_SCTP_CKSUM;
 448                 } else {
 449                         /* XXX implement CRC32c, example available in
 450                          * RFC3309 */
 451                 }
 452         }
 453
 454         return ol_flags;
 455 }
 456
 457 /* Calculate the checksum of outer header */
 458 static uint64_t
 459 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 460         uint64_t tx_offloads, int tso_enabled)
 461 {
 462         struct rte_ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 463         struct rte_ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 464         struct udp_hdr *udp_hdr;
 465         uint64_t ol_flags = 0;
 466
 467         if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPv4)) {
 468                 ipv4_hdr->hdr_checksum = 0;
 469                 ol_flags |= PKT_TX_OUTER_IPV4;
 470
 471                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 472                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 473                 else
 474                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 475         } else
 476                 ol_flags |= PKT_TX_OUTER_IPV6;
 477
 478         if (info->outer_l4_proto != IPPROTO_UDP)
 479                 return ol_flags;
 480
 481         /* Skip SW outer UDP checksum generation if HW supports it */
 482         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 483                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 484                 return ol_flags;
 485         }
 486
 487         udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + info->outer_l3_len);
 488
 489         /* outer UDP checksum is done in software. In the other side, for
 490          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 491          * set to zero.
 492          *
 493          * If a packet will be TSOed into small packets by NIC, we cannot
 494          * set/calculate a non-zero checksum, because it will be a wrong
 495          * value after the packet be split into several small packets.
 496          */
 497         if (tso_enabled)
 498                 udp_hdr->dgram_cksum = 0;
 499
 500         /* do not recalculate udp cksum if it was 0 */
 501         if (udp_hdr->dgram_cksum != 0) {
 502                 udp_hdr->dgram_cksum = 0;
 503                 if (info->outer_ethertype == _htons(RTE_ETHER_TYPE_IPv4))
 504                         udp_hdr->dgram_cksum =
 505                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 506                 else
 507                         udp_hdr->dgram_cksum =
 508                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 509         }
 510
 511         return ol_flags;
 512 }
 513
 514 /*
 515  * Helper function.
 516  * Performs actual copying.
 517  * Returns number of segments in the destination mbuf on success,
 518  * or negative error code on failure.
 519  */
 520 static int
 521 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 522         uint16_t seglen[], uint8_t nb_seg)
 523 {
 524         uint32_t dlen, slen, tlen;
 525         uint32_t i, len;
 526         const struct rte_mbuf *m;
 527         const uint8_t *src;
 528         uint8_t *dst;
 529
 530         dlen = 0;
 531         slen = 0;
 532         tlen = 0;
 533
 534         dst = NULL;
 535         src = NULL;
 536
 537         m = ms;
 538         i = 0;
 539         while (ms != NULL && i != nb_seg) {
 540
 541                 if (slen == 0) {
 542                         slen = rte_pktmbuf_data_len(ms);
 543                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 544                 }
 545
 546                 if (dlen == 0) {
 547                         dlen = RTE_MIN(seglen[i], slen);
 548                         md[i]->data_len = dlen;
 549                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 550                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 551                 }
 552
 553                 len = RTE_MIN(slen, dlen);
 554                 memcpy(dst, src, len);
 555                 tlen += len;
 556                 slen -= len;
 557                 dlen -= len;
 558                 src += len;
 559                 dst += len;
 560
 561                 if (slen == 0)
 562                         ms = ms->next;
 563                 if (dlen == 0)
 564                         i++;
 565         }
 566
 567         if (ms != NULL)
 568                 return -ENOBUFS;
 569         else if (tlen != m->pkt_len)
 570                 return -EINVAL;
 571
 572         md[0]->nb_segs = nb_seg;
 573         md[0]->pkt_len = tlen;
 574         md[0]->vlan_tci = m->vlan_tci;
 575         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 576         md[0]->ol_flags = m->ol_flags;
 577         md[0]->tx_offload = m->tx_offload;
 578
 579         return nb_seg;
 580 }
 581
 582 /*
 583  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 584  * Copy packet contents and offload information into the new segmented mbuf.
 585  */
 586 static struct rte_mbuf *
 587 pkt_copy_split(const struct rte_mbuf *pkt)
 588 {
 589         int32_t n, rc;
 590         uint32_t i, len, nb_seg;
 591         struct rte_mempool *mp;
 592         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 593         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 594
 595         mp = current_fwd_lcore()->mbp;
 596
 597         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 598                 nb_seg = random() % tx_pkt_nb_segs + 1;
 599         else
 600                 nb_seg = tx_pkt_nb_segs;
 601
 602         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 603
 604         /* calculate number of segments to use and their length. */
 605         len = 0;
 606         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 607                 len += seglen[i];
 608                 md[i] = NULL;
 609         }
 610
 611         n = pkt->pkt_len - len;
 612
 613         /* update size of the last segment to fit rest of the packet */
 614         if (n >= 0) {
 615                 seglen[i - 1] += n;
 616                 len += n;
 617         }
 618
 619         nb_seg = i;
 620         while (i != 0) {
 621                 p = rte_pktmbuf_alloc(mp);
 622                 if (p == NULL) {
 623                         TESTPMD_LOG(ERR,
 624                                 "failed to allocate %u-th of %u mbuf "
 625                                 "from mempool: %s\n",
 626                                 nb_seg - i, nb_seg, mp->name);
 627                         break;
 628                 }
 629
 630                 md[--i] = p;
 631                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 632                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 633                                 "expected seglen: %u, "
 634                                 "actual mbuf tailroom: %u\n",
 635                                 mp->name, i, seglen[i],
 636                                 rte_pktmbuf_tailroom(md[i]));
 637                         break;
 638                 }
 639         }
 640
 641         /* all mbufs successfully allocated, do copy */
 642         if (i == 0) {
 643                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 644                 if (rc < 0)
 645                         TESTPMD_LOG(ERR,
 646                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 647                                 "into %u segments failed with error code: %d\n",
 648                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 649
 650                 /* figure out how many mbufs to free. */
 651                 i = RTE_MAX(rc, 0);
 652         }
 653
 654         /* free unused mbufs */
 655         for (; i != nb_seg; i++) {
 656                 rte_pktmbuf_free_seg(md[i]);
 657                 md[i] = NULL;
 658         }
 659
 660         return md[0];
 661 }
 662
 663 /*
 664  * Receive a burst of packets, and for each packet:
 665  *  - parse packet, and try to recognize a supported packet type (1)
 666  *  - if it's not a supported packet type, don't touch the packet, else:
 667  *  - reprocess the checksum of all supported layers. This is done in SW
 668  *    or HW, depending on testpmd command line configuration
 669  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 670  *    segmentation offload (this implies HW TCP checksum)
 671  * Then transmit packets on the output port.
 672  *
 673  * (1) Supported packets are:
 674  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 675  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 676  *           UDP|TCP|SCTP
 677  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 678  *           UDP|TCP|SCTP
 679  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 680  *           UDP|TCP|SCTP
 681  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 682  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 683  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 684  *
 685  * The testpmd command line for this forward engine sets the flags
 686  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 687  * wether a checksum must be calculated in software or in hardware. The
 688  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 689  * OUTER_IP is only useful for tunnel packets.
 690  */
 691 static void
 692 pkt_burst_checksum_forward(struct fwd_stream *fs)
 693 {
 694         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 695         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 696         struct rte_gso_ctx *gso_ctx;
 697         struct rte_mbuf **tx_pkts_burst;
 698         struct rte_port *txp;
 699         struct rte_mbuf *m, *p;
 700         struct rte_ether_hdr *eth_hdr;
 701         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 702         void **gro_ctx;
 703         uint16_t gro_pkts_num;
 704         uint8_t gro_enable;
 705         uint16_t nb_rx;
 706         uint16_t nb_tx;
 707         uint16_t nb_prep;
 708         uint16_t i;
 709         uint64_t rx_ol_flags, tx_ol_flags;
 710         uint64_t tx_offloads;
 711         uint32_t retry;
 712         uint32_t rx_bad_ip_csum;
 713         uint32_t rx_bad_l4_csum;
 714         uint32_t rx_bad_outer_l4_csum;
 715         struct testpmd_offload_info info;
 716         uint16_t nb_segments = 0;
 717         int ret;
 718
 719 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 720         uint64_t start_tsc;
 721         uint64_t end_tsc;
 722         uint64_t core_cycles;
 723 #endif
 724
 725 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 726         start_tsc = rte_rdtsc();
 727 #endif
 728
 729         /* receive a burst of packet */
 730         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 731                                  nb_pkt_per_burst);
 732         if (unlikely(nb_rx == 0))
 733                 return;
 734 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 735         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 736 #endif
 737         fs->rx_packets += nb_rx;
 738         rx_bad_ip_csum = 0;
 739         rx_bad_l4_csum = 0;
 740         rx_bad_outer_l4_csum = 0;
 741         gro_enable = gro_ports[fs->rx_port].enable;
 742
 743         txp = &ports[fs->tx_port];
 744         tx_offloads = txp->dev_conf.txmode.offloads;
 745         memset(&info, 0, sizeof(info));
 746         info.tso_segsz = txp->tso_segsz;
 747         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 748         if (gso_ports[fs->tx_port].enable)
 749                 info.gso_enable = 1;
 750
 751         for (i = 0; i < nb_rx; i++) {
 752                 if (likely(i < nb_rx - 1))
 753                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 754                                                        void *));
 755
 756                 m = pkts_burst[i];
 757                 info.is_tunnel = 0;
 758                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 759                 tx_ol_flags = m->ol_flags &
 760                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 761                 rx_ol_flags = m->ol_flags;
 762
 763                 /* Update the L3/L4 checksum error packet statistics */
 764                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 765                         rx_bad_ip_csum += 1;
 766                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 767                         rx_bad_l4_csum += 1;
 768                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 769                         rx_bad_outer_l4_csum += 1;
 770
 771                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 772                  * and inner headers */
 773
 774                 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
 775                 rte_ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 776                                 &eth_hdr->d_addr);
 777                 rte_ether_addr_copy(&ports[fs->tx_port].eth_addr,
 778                                 &eth_hdr->s_addr);
 779                 parse_ethernet(eth_hdr, &info);
 780                 l3_hdr = (char *)eth_hdr + info.l2_len;
 781
 782                 /* check if it's a supported tunnel */
 783                 if (txp->parse_tunnel) {
 784                         if (info.l4_proto == IPPROTO_UDP) {
 785                                 struct udp_hdr *udp_hdr;
 786
 787                                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
 788                                         info.l3_len);
 789                                 parse_vxlan_gpe(udp_hdr, &info);
 790                                 if (info.is_tunnel) {
 791                                         tx_ol_flags |= PKT_TX_TUNNEL_VXLAN_GPE;
 792                                 } else {
 793                                         parse_vxlan(udp_hdr, &info,
 794                                                     m->packet_type);
 795                                         if (info.is_tunnel)
 796                                                 tx_ol_flags |=
 797                                                         PKT_TX_TUNNEL_VXLAN;
 798                                 }
 799                         } else if (info.l4_proto == IPPROTO_GRE) {
 800                                 struct simple_gre_hdr *gre_hdr;
 801
 802                                 gre_hdr = (struct simple_gre_hdr *)
 803                                         ((char *)l3_hdr + info.l3_len);
 804                                 parse_gre(gre_hdr, &info);
 805                                 if (info.is_tunnel)
 806                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 807                         } else if (info.l4_proto == IPPROTO_IPIP) {
 808                                 void *encap_ip_hdr;
 809
 810                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 811                                 parse_encap_ip(encap_ip_hdr, &info);
 812                                 if (info.is_tunnel)
 813                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 814                         }
 815                 }
 816
 817                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 818                 if (info.is_tunnel) {
 819                         outer_l3_hdr = l3_hdr;
 820                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 821                 }
 822
 823                 /* step 2: depending on user command line configuration,
 824                  * recompute checksum either in software or flag the
 825                  * mbuf to offload the calculation to the NIC. If TSO
 826                  * is configured, prepare the mbuf for TCP segmentation. */
 827
 828                 /* process checksums of inner headers first */
 829                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 830                         tx_offloads);
 831
 832                 /* Then process outer headers if any. Note that the software
 833                  * checksum will be wrong if one of the inner checksums is
 834                  * processed in hardware. */
 835                 if (info.is_tunnel == 1) {
 836                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 837                                         tx_offloads,
 838                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 839                 }
 840
 841                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 842
 843                 m->tx_offload = 0;
 844                 if (info.is_tunnel == 1) {
 845                         if (info.tunnel_tso_segsz ||
 846                             (tx_offloads &
 847                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 848                             (tx_offloads &
 849                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 850                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 851                                 m->outer_l2_len = info.outer_l2_len;
 852                                 m->outer_l3_len = info.outer_l3_len;
 853                                 m->l2_len = info.l2_len;
 854                                 m->l3_len = info.l3_len;
 855                                 m->l4_len = info.l4_len;
 856                                 m->tso_segsz = info.tunnel_tso_segsz;
 857                         }
 858                         else {
 859                                 /* if there is a outer UDP cksum
 860                                    processed in sw and the inner in hw,
 861                                    the outer checksum will be wrong as
 862                                    the payload will be modified by the
 863                                    hardware */
 864                                 m->l2_len = info.outer_l2_len +
 865                                         info.outer_l3_len + info.l2_len;
 866                                 m->l3_len = info.l3_len;
 867                                 m->l4_len = info.l4_len;
 868                         }
 869                 } else {
 870                         /* this is only useful if an offload flag is
 871                          * set, but it does not hurt to fill it in any
 872                          * case */
 873                         m->l2_len = info.l2_len;
 874                         m->l3_len = info.l3_len;
 875                         m->l4_len = info.l4_len;
 876                         m->tso_segsz = info.tso_segsz;
 877                 }
 878                 m->ol_flags = tx_ol_flags;
 879
 880                 /* Do split & copy for the packet. */
 881                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 882                         p = pkt_copy_split(m);
 883                         if (p != NULL) {
 884                                 rte_pktmbuf_free(m);
 885                                 m = p;
 886                                 pkts_burst[i] = m;
 887                         }
 888                 }
 889
 890                 /* if verbose mode is enabled, dump debug info */
 891                 if (verbose_level > 0) {
 892                         char buf[256];
 893
 894                         printf("-----------------\n");
 895                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 896                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 897                         /* dump rx parsed packet info */
 898                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 899                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 900                                 "l4_proto=%d l4_len=%d flags=%s\n",
 901                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 902                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 903                         if (rx_ol_flags & PKT_RX_LRO)
 904                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 905                         if (info.is_tunnel == 1)
 906                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 907                                         "outer_l3_len=%d\n", info.outer_l2_len,
 908                                         rte_be_to_cpu_16(info.outer_ethertype),
 909                                         info.outer_l3_len);
 910                         /* dump tx packet info */
 911                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 912                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 913                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 914                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 915                                 info.tso_segsz != 0)
 916                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 917                                         "m->l4_len=%d\n",
 918                                         m->l2_len, m->l3_len, m->l4_len);
 919                         if (info.is_tunnel == 1) {
 920                                 if ((tx_offloads &
 921                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 922                                     (tx_offloads &
 923                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 924                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
 925                                         printf("tx: m->outer_l2_len=%d "
 926                                                 "m->outer_l3_len=%d\n",
 927                                                 m->outer_l2_len,
 928                                                 m->outer_l3_len);
 929                                 if (info.tunnel_tso_segsz != 0 &&
 930                                                 (m->ol_flags & PKT_TX_TCP_SEG))
 931                                         printf("tx: m->tso_segsz=%d\n",
 932                                                 m->tso_segsz);
 933                         } else if (info.tso_segsz != 0 &&
 934                                         (m->ol_flags & PKT_TX_TCP_SEG))
 935                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
 936                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
 937                         printf("tx: flags=%s", buf);
 938                         printf("\n");
 939                 }
 940         }
 941
 942         if (unlikely(gro_enable)) {
 943                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
 944                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
 945                                         &(gro_ports[fs->rx_port].param));
 946                 } else {
 947                         gro_ctx = current_fwd_lcore()->gro_ctx;
 948                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
 949
 950                         if (++fs->gro_times >= gro_flush_cycles) {
 951                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
 952                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
 953                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
 954
 955                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
 956                                                 RTE_GRO_TCP_IPV4,
 957                                                 &pkts_burst[nb_rx],
 958                                                 gro_pkts_num);
 959                                 fs->gro_times = 0;
 960                         }
 961                 }
 962         }
 963
 964         if (gso_ports[fs->tx_port].enable == 0)
 965                 tx_pkts_burst = pkts_burst;
 966         else {
 967                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
 968                 gso_ctx->gso_size = gso_max_segment_size;
 969                 for (i = 0; i < nb_rx; i++) {
 970                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
 971                                         &gso_segments[nb_segments],
 972                                         GSO_MAX_PKT_BURST - nb_segments);
 973                         if (ret >= 0)
 974                                 nb_segments += ret;
 975                         else {
 976                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
 977                                 rte_pktmbuf_free(pkts_burst[i]);
 978                         }
 979                 }
 980
 981                 tx_pkts_burst = gso_segments;
 982                 nb_rx = nb_segments;
 983         }
 984
 985         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
 986                         tx_pkts_burst, nb_rx);
 987         if (nb_prep != nb_rx)
 988                 printf("Preparing packet burst to transmit failed: %s\n",
 989                                 rte_strerror(rte_errno));
 990
 991         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
 992                         nb_prep);
 993
 994         /*
 995          * Retry if necessary
 996          */
 997         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
 998                 retry = 0;
 999                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
1000                         rte_delay_us(burst_tx_delay_time);
1001                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
1002                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
1003                 }
1004         }
1005         fs->tx_packets += nb_tx;
1006         fs->rx_bad_ip_csum += rx_bad_ip_csum;
1007         fs->rx_bad_l4_csum += rx_bad_l4_csum;
1008         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
1009
1010 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1011         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1012 #endif
1013         if (unlikely(nb_tx < nb_rx)) {
1014                 fs->fwd_dropped += (nb_rx - nb_tx);
1015                 do {
1016                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1017                 } while (++nb_tx < nb_rx);
1018         }
1019
1020 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1021         end_tsc = rte_rdtsc();
1022         core_cycles = (end_tsc - start_tsc);
1023         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1024 #endif
1025 }
1026
1027 struct fwd_engine csum_fwd_engine = {
1028         .fwd_mode_name  = "csum",
1029         .port_fwd_begin = NULL,
1030         .port_fwd_end   = NULL,
1031         .packet_fwd     = pkt_burst_checksum_forward,
1032 };