app/test-pmd/csumonly.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright 2014 6WIND S.A.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12
  13 #include <sys/queue.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_common.h>
  17 #include <rte_byteorder.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_memory.h>
  22 #include <rte_memcpy.h>
  23 #include <rte_launch.h>
  24 #include <rte_eal.h>
  25 #include <rte_per_lcore.h>
  26 #include <rte_lcore.h>
  27 #include <rte_atomic.h>
  28 #include <rte_branch_prediction.h>
  29 #include <rte_mempool.h>
  30 #include <rte_mbuf.h>
  31 #include <rte_interrupts.h>
  32 #include <rte_pci.h>
  33 #include <rte_ether.h>
  34 #include <rte_ethdev.h>
  35 #include <rte_ip.h>
  36 #include <rte_tcp.h>
  37 #include <rte_udp.h>
  38 #include <rte_sctp.h>
  39 #include <rte_prefetch.h>
  40 #include <rte_string_fns.h>
  41 #include <rte_flow.h>
  42 #include <rte_gro.h>
  43 #include <rte_gso.h>
  44
  45 #include "testpmd.h"
  46
  47 #define IP_DEFTTL  64   /* from RFC 1340. */
  48 #define IP_VERSION 0x40
  49 #define IP_HDRLEN  0x05 /* default IP header length == five 32-bits words. */
  50 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
  51
  52 #define GRE_CHECKSUM_PRESENT    0x8000
  53 #define GRE_KEY_PRESENT         0x2000
  54 #define GRE_SEQUENCE_PRESENT    0x1000
  55 #define GRE_EXT_LEN             4
  56 #define GRE_SUPPORTED_FIELDS    (GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
  57                                  GRE_SEQUENCE_PRESENT)
  58
  59 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
  60 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
  61 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
  62 #else
  63 #define _htons(x) (x)
  64 #endif
  65
  66 uint16_t vxlan_gpe_udp_port = 4790;
  67
  68 /* structure that caches offload info for the current packet */
  69 struct testpmd_offload_info {
  70         uint16_t ethertype;
  71         uint8_t gso_enable;
  72         uint16_t l2_len;
  73         uint16_t l3_len;
  74         uint16_t l4_len;
  75         uint8_t l4_proto;
  76         uint8_t is_tunnel;
  77         uint16_t outer_ethertype;
  78         uint16_t outer_l2_len;
  79         uint16_t outer_l3_len;
  80         uint8_t outer_l4_proto;
  81         uint16_t tso_segsz;
  82         uint16_t tunnel_tso_segsz;
  83         uint32_t pkt_len;
  84 };
  85
  86 /* simplified GRE header */
  87 struct simple_gre_hdr {
  88         uint16_t flags;
  89         uint16_t proto;
  90 } __attribute__((__packed__));
  91
  92 static uint16_t
  93 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
  94 {
  95         if (ethertype == _htons(ETHER_TYPE_IPv4))
  96                 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
  97         else /* assume ethertype == ETHER_TYPE_IPv6 */
  98                 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
  99 }
 100
 101 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
 102 static void
 103 parse_ipv4(struct ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
 104 {
 105         struct tcp_hdr *tcp_hdr;
 106
 107         info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
 108         info->l4_proto = ipv4_hdr->next_proto_id;
 109
 110         /* only fill l4_len for TCP, it's useful for TSO */
 111         if (info->l4_proto == IPPROTO_TCP) {
 112                 tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + info->l3_len);
 113                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 114         } else if (info->l4_proto == IPPROTO_UDP)
 115                 info->l4_len = sizeof(struct 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 ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
 123 {
 124         struct tcp_hdr *tcp_hdr;
 125
 126         info->l3_len = sizeof(struct 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 tcp_hdr *)((char *)ipv6_hdr + info->l3_len);
 132                 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 133         } else if (info->l4_proto == IPPROTO_UDP)
 134                 info->l4_len = sizeof(struct udp_hdr);
 135         else
 136                 info->l4_len = 0;
 137 }
 138
 139 /*
 140  * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
 141  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
 142  * header. The l4_len argument is only set in case of TCP (useful for TSO).
 143  */
 144 static void
 145 parse_ethernet(struct ether_hdr *eth_hdr, struct testpmd_offload_info *info)
 146 {
 147         struct ipv4_hdr *ipv4_hdr;
 148         struct ipv6_hdr *ipv6_hdr;
 149
 150         info->l2_len = sizeof(struct ether_hdr);
 151         info->ethertype = eth_hdr->ether_type;
 152
 153         if (info->ethertype == _htons(ETHER_TYPE_VLAN)) {
 154                 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
 155
 156                 info->l2_len  += sizeof(struct vlan_hdr);
 157                 info->ethertype = vlan_hdr->eth_proto;
 158         }
 159
 160         switch (info->ethertype) {
 161         case _htons(ETHER_TYPE_IPv4):
 162                 ipv4_hdr = (struct ipv4_hdr *) ((char *)eth_hdr + info->l2_len);
 163                 parse_ipv4(ipv4_hdr, info);
 164                 break;
 165         case _htons(ETHER_TYPE_IPv6):
 166                 ipv6_hdr = (struct ipv6_hdr *) ((char *)eth_hdr + info->l2_len);
 167                 parse_ipv6(ipv6_hdr, info);
 168                 break;
 169         default:
 170                 info->l4_len = 0;
 171                 info->l3_len = 0;
 172                 info->l4_proto = 0;
 173                 break;
 174         }
 175 }
 176
 177 /* Parse a vxlan header */
 178 static void
 179 parse_vxlan(struct udp_hdr *udp_hdr,
 180             struct testpmd_offload_info *info,
 181             uint32_t pkt_type)
 182 {
 183         struct ether_hdr *eth_hdr;
 184
 185         /* check udp destination port, 4789 is the default vxlan port
 186          * (rfc7348) or that the rx offload flag is set (i40e only
 187          * currently) */
 188         if (udp_hdr->dst_port != _htons(4789) &&
 189                 RTE_ETH_IS_TUNNEL_PKT(pkt_type) == 0)
 190                 return;
 191
 192         info->is_tunnel = 1;
 193         info->outer_ethertype = info->ethertype;
 194         info->outer_l2_len = info->l2_len;
 195         info->outer_l3_len = info->l3_len;
 196         info->outer_l4_proto = info->l4_proto;
 197
 198         eth_hdr = (struct ether_hdr *)((char *)udp_hdr +
 199                 sizeof(struct udp_hdr) +
 200                 sizeof(struct vxlan_hdr));
 201
 202         parse_ethernet(eth_hdr, info);
 203         info->l2_len += ETHER_VXLAN_HLEN; /* add udp + vxlan */
 204 }
 205
 206 /* Parse a vxlan-gpe header */
 207 static void
 208 parse_vxlan_gpe(struct udp_hdr *udp_hdr,
 209             struct testpmd_offload_info *info)
 210 {
 211         struct ether_hdr *eth_hdr;
 212         struct ipv4_hdr *ipv4_hdr;
 213         struct ipv6_hdr *ipv6_hdr;
 214         struct vxlan_gpe_hdr *vxlan_gpe_hdr;
 215         uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
 216
 217         /* Check udp destination port. */
 218         if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
 219                 return;
 220
 221         vxlan_gpe_hdr = (struct vxlan_gpe_hdr *)((char *)udp_hdr +
 222                                 sizeof(struct udp_hdr));
 223
 224         if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
 225             VXLAN_GPE_TYPE_IPV4) {
 226                 info->is_tunnel = 1;
 227                 info->outer_ethertype = info->ethertype;
 228                 info->outer_l2_len = info->l2_len;
 229                 info->outer_l3_len = info->l3_len;
 230                 info->outer_l4_proto = info->l4_proto;
 231
 232                 ipv4_hdr = (struct ipv4_hdr *)((char *)vxlan_gpe_hdr +
 233                            vxlan_gpe_len);
 234
 235                 parse_ipv4(ipv4_hdr, info);
 236                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 237                 info->l2_len = 0;
 238
 239         } else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_IPV6) {
 240                 info->is_tunnel = 1;
 241                 info->outer_ethertype = info->ethertype;
 242                 info->outer_l2_len = info->l2_len;
 243                 info->outer_l3_len = info->l3_len;
 244                 info->outer_l4_proto = info->l4_proto;
 245
 246                 ipv6_hdr = (struct ipv6_hdr *)((char *)vxlan_gpe_hdr +
 247                            vxlan_gpe_len);
 248
 249                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 250                 parse_ipv6(ipv6_hdr, info);
 251                 info->l2_len = 0;
 252
 253         } else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_ETH) {
 254                 info->is_tunnel = 1;
 255                 info->outer_ethertype = info->ethertype;
 256                 info->outer_l2_len = info->l2_len;
 257                 info->outer_l3_len = info->l3_len;
 258                 info->outer_l4_proto = info->l4_proto;
 259
 260                 eth_hdr = (struct ether_hdr *)((char *)vxlan_gpe_hdr +
 261                           vxlan_gpe_len);
 262
 263                 parse_ethernet(eth_hdr, info);
 264         } else
 265                 return;
 266
 267         info->l2_len += ETHER_VXLAN_GPE_HLEN;
 268 }
 269
 270 /* Parse a gre header */
 271 static void
 272 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 273 {
 274         struct ether_hdr *eth_hdr;
 275         struct ipv4_hdr *ipv4_hdr;
 276         struct ipv6_hdr *ipv6_hdr;
 277         uint8_t gre_len = 0;
 278
 279         gre_len += sizeof(struct simple_gre_hdr);
 280
 281         if (gre_hdr->flags & _htons(GRE_KEY_PRESENT))
 282                 gre_len += GRE_EXT_LEN;
 283         if (gre_hdr->flags & _htons(GRE_SEQUENCE_PRESENT))
 284                 gre_len += GRE_EXT_LEN;
 285         if (gre_hdr->flags & _htons(GRE_CHECKSUM_PRESENT))
 286                 gre_len += GRE_EXT_LEN;
 287
 288         if (gre_hdr->proto == _htons(ETHER_TYPE_IPv4)) {
 289                 info->is_tunnel = 1;
 290                 info->outer_ethertype = info->ethertype;
 291                 info->outer_l2_len = info->l2_len;
 292                 info->outer_l3_len = info->l3_len;
 293                 info->outer_l4_proto = info->l4_proto;
 294
 295                 ipv4_hdr = (struct ipv4_hdr *)((char *)gre_hdr + gre_len);
 296
 297                 parse_ipv4(ipv4_hdr, info);
 298                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 299                 info->l2_len = 0;
 300
 301         } else if (gre_hdr->proto == _htons(ETHER_TYPE_IPv6)) {
 302                 info->is_tunnel = 1;
 303                 info->outer_ethertype = info->ethertype;
 304                 info->outer_l2_len = info->l2_len;
 305                 info->outer_l3_len = info->l3_len;
 306                 info->outer_l4_proto = info->l4_proto;
 307
 308                 ipv6_hdr = (struct ipv6_hdr *)((char *)gre_hdr + gre_len);
 309
 310                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 311                 parse_ipv6(ipv6_hdr, info);
 312                 info->l2_len = 0;
 313
 314         } else if (gre_hdr->proto == _htons(ETHER_TYPE_TEB)) {
 315                 info->is_tunnel = 1;
 316                 info->outer_ethertype = info->ethertype;
 317                 info->outer_l2_len = info->l2_len;
 318                 info->outer_l3_len = info->l3_len;
 319                 info->outer_l4_proto = info->l4_proto;
 320
 321                 eth_hdr = (struct ether_hdr *)((char *)gre_hdr + gre_len);
 322
 323                 parse_ethernet(eth_hdr, info);
 324         } else
 325                 return;
 326
 327         info->l2_len += gre_len;
 328 }
 329
 330
 331 /* Parse an encapsulated ip or ipv6 header */
 332 static void
 333 parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
 334 {
 335         struct ipv4_hdr *ipv4_hdr = encap_ip;
 336         struct ipv6_hdr *ipv6_hdr = encap_ip;
 337         uint8_t ip_version;
 338
 339         ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
 340
 341         if (ip_version != 4 && ip_version != 6)
 342                 return;
 343
 344         info->is_tunnel = 1;
 345         info->outer_ethertype = info->ethertype;
 346         info->outer_l2_len = info->l2_len;
 347         info->outer_l3_len = info->l3_len;
 348
 349         if (ip_version == 4) {
 350                 parse_ipv4(ipv4_hdr, info);
 351                 info->ethertype = _htons(ETHER_TYPE_IPv4);
 352         } else {
 353                 parse_ipv6(ipv6_hdr, info);
 354                 info->ethertype = _htons(ETHER_TYPE_IPv6);
 355         }
 356         info->l2_len = 0;
 357 }
 358
 359 /* if possible, calculate the checksum of a packet in hw or sw,
 360  * depending on the testpmd command line configuration */
 361 static uint64_t
 362 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 363         uint64_t tx_offloads)
 364 {
 365         struct ipv4_hdr *ipv4_hdr = l3_hdr;
 366         struct udp_hdr *udp_hdr;
 367         struct tcp_hdr *tcp_hdr;
 368         struct sctp_hdr *sctp_hdr;
 369         uint64_t ol_flags = 0;
 370         uint32_t max_pkt_len, tso_segsz = 0;
 371
 372         /* ensure packet is large enough to require tso */
 373         if (!info->is_tunnel) {
 374                 max_pkt_len = info->l2_len + info->l3_len + info->l4_len +
 375                         info->tso_segsz;
 376                 if (info->tso_segsz != 0 && info->pkt_len > max_pkt_len)
 377                         tso_segsz = info->tso_segsz;
 378         } else {
 379                 max_pkt_len = info->outer_l2_len + info->outer_l3_len +
 380                         info->l2_len + info->l3_len + info->l4_len +
 381                         info->tunnel_tso_segsz;
 382                 if (info->tunnel_tso_segsz != 0 && info->pkt_len > max_pkt_len)
 383                         tso_segsz = info->tunnel_tso_segsz;
 384         }
 385
 386         if (info->ethertype == _htons(ETHER_TYPE_IPv4)) {
 387                 ipv4_hdr = l3_hdr;
 388                 ipv4_hdr->hdr_checksum = 0;
 389
 390                 ol_flags |= PKT_TX_IPV4;
 391                 if (info->l4_proto == IPPROTO_TCP && tso_segsz) {
 392                         ol_flags |= PKT_TX_IP_CKSUM;
 393                 } else {
 394                         if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM)
 395                                 ol_flags |= PKT_TX_IP_CKSUM;
 396                         else
 397                                 ipv4_hdr->hdr_checksum =
 398                                         rte_ipv4_cksum(ipv4_hdr);
 399                 }
 400         } else if (info->ethertype == _htons(ETHER_TYPE_IPv6))
 401                 ol_flags |= PKT_TX_IPV6;
 402         else
 403                 return 0; /* packet type not supported, nothing to do */
 404
 405         if (info->l4_proto == IPPROTO_UDP) {
 406                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
 407                 /* do not recalculate udp cksum if it was 0 */
 408                 if (udp_hdr->dgram_cksum != 0) {
 409                         udp_hdr->dgram_cksum = 0;
 410                         if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)
 411                                 ol_flags |= PKT_TX_UDP_CKSUM;
 412                         else {
 413                                 udp_hdr->dgram_cksum =
 414                                         get_udptcp_checksum(l3_hdr, udp_hdr,
 415                                                 info->ethertype);
 416                         }
 417                 }
 418                 if (info->gso_enable)
 419                         ol_flags |= PKT_TX_UDP_SEG;
 420         } else if (info->l4_proto == IPPROTO_TCP) {
 421                 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
 422                 tcp_hdr->cksum = 0;
 423                 if (tso_segsz)
 424                         ol_flags |= PKT_TX_TCP_SEG;
 425                 else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)
 426                         ol_flags |= PKT_TX_TCP_CKSUM;
 427                 else {
 428                         tcp_hdr->cksum =
 429                                 get_udptcp_checksum(l3_hdr, tcp_hdr,
 430                                         info->ethertype);
 431                 }
 432                 if (info->gso_enable)
 433                         ol_flags |= PKT_TX_TCP_SEG;
 434         } else if (info->l4_proto == IPPROTO_SCTP) {
 435                 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
 436                 sctp_hdr->cksum = 0;
 437                 /* sctp payload must be a multiple of 4 to be
 438                  * offloaded */
 439                 if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) &&
 440                         ((ipv4_hdr->total_length & 0x3) == 0)) {
 441                         ol_flags |= PKT_TX_SCTP_CKSUM;
 442                 } else {
 443                         /* XXX implement CRC32c, example available in
 444                          * RFC3309 */
 445                 }
 446         }
 447
 448         return ol_flags;
 449 }
 450
 451 /* Calculate the checksum of outer header */
 452 static uint64_t
 453 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
 454         uint64_t tx_offloads, int tso_enabled)
 455 {
 456         struct ipv4_hdr *ipv4_hdr = outer_l3_hdr;
 457         struct ipv6_hdr *ipv6_hdr = outer_l3_hdr;
 458         struct udp_hdr *udp_hdr;
 459         uint64_t ol_flags = 0;
 460
 461         if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4)) {
 462                 ipv4_hdr->hdr_checksum = 0;
 463                 ol_flags |= PKT_TX_OUTER_IPV4;
 464
 465                 if (tx_offloads & DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM)
 466                         ol_flags |= PKT_TX_OUTER_IP_CKSUM;
 467                 else
 468                         ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 469         } else
 470                 ol_flags |= PKT_TX_OUTER_IPV6;
 471
 472         if (info->outer_l4_proto != IPPROTO_UDP)
 473                 return ol_flags;
 474
 475         /* Skip SW outer UDP checksum generation if HW supports it */
 476         if (tx_offloads & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
 477                 ol_flags |= PKT_TX_OUTER_UDP_CKSUM;
 478                 return ol_flags;
 479         }
 480
 481         udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + info->outer_l3_len);
 482
 483         /* outer UDP checksum is done in software. In the other side, for
 484          * UDP tunneling, like VXLAN or Geneve, outer UDP checksum can be
 485          * set to zero.
 486          *
 487          * If a packet will be TSOed into small packets by NIC, we cannot
 488          * set/calculate a non-zero checksum, because it will be a wrong
 489          * value after the packet be split into several small packets.
 490          */
 491         if (tso_enabled)
 492                 udp_hdr->dgram_cksum = 0;
 493
 494         /* do not recalculate udp cksum if it was 0 */
 495         if (udp_hdr->dgram_cksum != 0) {
 496                 udp_hdr->dgram_cksum = 0;
 497                 if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4))
 498                         udp_hdr->dgram_cksum =
 499                                 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
 500                 else
 501                         udp_hdr->dgram_cksum =
 502                                 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
 503         }
 504
 505         return ol_flags;
 506 }
 507
 508 /*
 509  * Helper function.
 510  * Performs actual copying.
 511  * Returns number of segments in the destination mbuf on success,
 512  * or negative error code on failure.
 513  */
 514 static int
 515 mbuf_copy_split(const struct rte_mbuf *ms, struct rte_mbuf *md[],
 516         uint16_t seglen[], uint8_t nb_seg)
 517 {
 518         uint32_t dlen, slen, tlen;
 519         uint32_t i, len;
 520         const struct rte_mbuf *m;
 521         const uint8_t *src;
 522         uint8_t *dst;
 523
 524         dlen = 0;
 525         slen = 0;
 526         tlen = 0;
 527
 528         dst = NULL;
 529         src = NULL;
 530
 531         m = ms;
 532         i = 0;
 533         while (ms != NULL && i != nb_seg) {
 534
 535                 if (slen == 0) {
 536                         slen = rte_pktmbuf_data_len(ms);
 537                         src = rte_pktmbuf_mtod(ms, const uint8_t *);
 538                 }
 539
 540                 if (dlen == 0) {
 541                         dlen = RTE_MIN(seglen[i], slen);
 542                         md[i]->data_len = dlen;
 543                         md[i]->next = (i + 1 == nb_seg) ? NULL : md[i + 1];
 544                         dst = rte_pktmbuf_mtod(md[i], uint8_t *);
 545                 }
 546
 547                 len = RTE_MIN(slen, dlen);
 548                 memcpy(dst, src, len);
 549                 tlen += len;
 550                 slen -= len;
 551                 dlen -= len;
 552                 src += len;
 553                 dst += len;
 554
 555                 if (slen == 0)
 556                         ms = ms->next;
 557                 if (dlen == 0)
 558                         i++;
 559         }
 560
 561         if (ms != NULL)
 562                 return -ENOBUFS;
 563         else if (tlen != m->pkt_len)
 564                 return -EINVAL;
 565
 566         md[0]->nb_segs = nb_seg;
 567         md[0]->pkt_len = tlen;
 568         md[0]->vlan_tci = m->vlan_tci;
 569         md[0]->vlan_tci_outer = m->vlan_tci_outer;
 570         md[0]->ol_flags = m->ol_flags;
 571         md[0]->tx_offload = m->tx_offload;
 572
 573         return nb_seg;
 574 }
 575
 576 /*
 577  * Allocate a new mbuf with up to tx_pkt_nb_segs segments.
 578  * Copy packet contents and offload information into the new segmented mbuf.
 579  */
 580 static struct rte_mbuf *
 581 pkt_copy_split(const struct rte_mbuf *pkt)
 582 {
 583         int32_t n, rc;
 584         uint32_t i, len, nb_seg;
 585         struct rte_mempool *mp;
 586         uint16_t seglen[RTE_MAX_SEGS_PER_PKT];
 587         struct rte_mbuf *p, *md[RTE_MAX_SEGS_PER_PKT];
 588
 589         mp = current_fwd_lcore()->mbp;
 590
 591         if (tx_pkt_split == TX_PKT_SPLIT_RND)
 592                 nb_seg = random() % tx_pkt_nb_segs + 1;
 593         else
 594                 nb_seg = tx_pkt_nb_segs;
 595
 596         memcpy(seglen, tx_pkt_seg_lengths, nb_seg * sizeof(seglen[0]));
 597
 598         /* calculate number of segments to use and their length. */
 599         len = 0;
 600         for (i = 0; i != nb_seg && len < pkt->pkt_len; i++) {
 601                 len += seglen[i];
 602                 md[i] = NULL;
 603         }
 604
 605         n = pkt->pkt_len - len;
 606
 607         /* update size of the last segment to fit rest of the packet */
 608         if (n >= 0) {
 609                 seglen[i - 1] += n;
 610                 len += n;
 611         }
 612
 613         nb_seg = i;
 614         while (i != 0) {
 615                 p = rte_pktmbuf_alloc(mp);
 616                 if (p == NULL) {
 617                         TESTPMD_LOG(ERR,
 618                                 "failed to allocate %u-th of %u mbuf "
 619                                 "from mempool: %s\n",
 620                                 nb_seg - i, nb_seg, mp->name);
 621                         break;
 622                 }
 623
 624                 md[--i] = p;
 625                 if (rte_pktmbuf_tailroom(md[i]) < seglen[i]) {
 626                         TESTPMD_LOG(ERR, "mempool %s, %u-th segment: "
 627                                 "expected seglen: %u, "
 628                                 "actual mbuf tailroom: %u\n",
 629                                 mp->name, i, seglen[i],
 630                                 rte_pktmbuf_tailroom(md[i]));
 631                         break;
 632                 }
 633         }
 634
 635         /* all mbufs successfully allocated, do copy */
 636         if (i == 0) {
 637                 rc = mbuf_copy_split(pkt, md, seglen, nb_seg);
 638                 if (rc < 0)
 639                         TESTPMD_LOG(ERR,
 640                                 "mbuf_copy_split for %p(len=%u, nb_seg=%u) "
 641                                 "into %u segments failed with error code: %d\n",
 642                                 pkt, pkt->pkt_len, pkt->nb_segs, nb_seg, rc);
 643
 644                 /* figure out how many mbufs to free. */
 645                 i = RTE_MAX(rc, 0);
 646         }
 647
 648         /* free unused mbufs */
 649         for (; i != nb_seg; i++) {
 650                 rte_pktmbuf_free_seg(md[i]);
 651                 md[i] = NULL;
 652         }
 653
 654         return md[0];
 655 }
 656
 657 /*
 658  * Receive a burst of packets, and for each packet:
 659  *  - parse packet, and try to recognize a supported packet type (1)
 660  *  - if it's not a supported packet type, don't touch the packet, else:
 661  *  - reprocess the checksum of all supported layers. This is done in SW
 662  *    or HW, depending on testpmd command line configuration
 663  *  - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
 664  *    segmentation offload (this implies HW TCP checksum)
 665  * Then transmit packets on the output port.
 666  *
 667  * (1) Supported packets are:
 668  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
 669  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
 670  *           UDP|TCP|SCTP
 671  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
 672  *           UDP|TCP|SCTP
 673  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
 674  *           UDP|TCP|SCTP
 675  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
 676  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
 677  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
 678  *
 679  * The testpmd command line for this forward engine sets the flags
 680  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
 681  * wether a checksum must be calculated in software or in hardware. The
 682  * IP, UDP, TCP and SCTP flags always concern the inner layer. The
 683  * OUTER_IP is only useful for tunnel packets.
 684  */
 685 static void
 686 pkt_burst_checksum_forward(struct fwd_stream *fs)
 687 {
 688         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
 689         struct rte_mbuf *gso_segments[GSO_MAX_PKT_BURST];
 690         struct rte_gso_ctx *gso_ctx;
 691         struct rte_mbuf **tx_pkts_burst;
 692         struct rte_port *txp;
 693         struct rte_mbuf *m, *p;
 694         struct ether_hdr *eth_hdr;
 695         void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
 696         void **gro_ctx;
 697         uint16_t gro_pkts_num;
 698         uint8_t gro_enable;
 699         uint16_t nb_rx;
 700         uint16_t nb_tx;
 701         uint16_t nb_prep;
 702         uint16_t i;
 703         uint64_t rx_ol_flags, tx_ol_flags;
 704         uint64_t tx_offloads;
 705         uint32_t retry;
 706         uint32_t rx_bad_ip_csum;
 707         uint32_t rx_bad_l4_csum;
 708         uint32_t rx_bad_outer_l4_csum;
 709         struct testpmd_offload_info info;
 710         uint16_t nb_segments = 0;
 711         int ret;
 712
 713 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 714         uint64_t start_tsc;
 715         uint64_t end_tsc;
 716         uint64_t core_cycles;
 717 #endif
 718
 719 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 720         start_tsc = rte_rdtsc();
 721 #endif
 722
 723         /* receive a burst of packet */
 724         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
 725                                  nb_pkt_per_burst);
 726         if (unlikely(nb_rx == 0))
 727                 return;
 728 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 729         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 730 #endif
 731         fs->rx_packets += nb_rx;
 732         rx_bad_ip_csum = 0;
 733         rx_bad_l4_csum = 0;
 734         rx_bad_outer_l4_csum = 0;
 735         gro_enable = gro_ports[fs->rx_port].enable;
 736
 737         txp = &ports[fs->tx_port];
 738         tx_offloads = txp->dev_conf.txmode.offloads;
 739         memset(&info, 0, sizeof(info));
 740         info.tso_segsz = txp->tso_segsz;
 741         info.tunnel_tso_segsz = txp->tunnel_tso_segsz;
 742         if (gso_ports[fs->tx_port].enable)
 743                 info.gso_enable = 1;
 744
 745         for (i = 0; i < nb_rx; i++) {
 746                 if (likely(i < nb_rx - 1))
 747                         rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
 748                                                        void *));
 749
 750                 m = pkts_burst[i];
 751                 info.is_tunnel = 0;
 752                 info.pkt_len = rte_pktmbuf_pkt_len(m);
 753                 tx_ol_flags = m->ol_flags &
 754                               (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF);
 755                 rx_ol_flags = m->ol_flags;
 756
 757                 /* Update the L3/L4 checksum error packet statistics */
 758                 if ((rx_ol_flags & PKT_RX_IP_CKSUM_MASK) == PKT_RX_IP_CKSUM_BAD)
 759                         rx_bad_ip_csum += 1;
 760                 if ((rx_ol_flags & PKT_RX_L4_CKSUM_MASK) == PKT_RX_L4_CKSUM_BAD)
 761                         rx_bad_l4_csum += 1;
 762                 if (rx_ol_flags & PKT_RX_OUTER_L4_CKSUM_BAD)
 763                         rx_bad_outer_l4_csum += 1;
 764
 765                 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
 766                  * and inner headers */
 767
 768                 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
 769                 ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
 770                                 &eth_hdr->d_addr);
 771                 ether_addr_copy(&ports[fs->tx_port].eth_addr,
 772                                 &eth_hdr->s_addr);
 773                 parse_ethernet(eth_hdr, &info);
 774                 l3_hdr = (char *)eth_hdr + info.l2_len;
 775
 776                 /* check if it's a supported tunnel */
 777                 if (txp->parse_tunnel) {
 778                         if (info.l4_proto == IPPROTO_UDP) {
 779                                 struct udp_hdr *udp_hdr;
 780
 781                                 udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
 782                                         info.l3_len);
 783                                 parse_vxlan_gpe(udp_hdr, &info);
 784                                 if (info.is_tunnel) {
 785                                         tx_ol_flags |= PKT_TX_TUNNEL_VXLAN_GPE;
 786                                 } else {
 787                                         parse_vxlan(udp_hdr, &info,
 788                                                     m->packet_type);
 789                                         if (info.is_tunnel)
 790                                                 tx_ol_flags |=
 791                                                         PKT_TX_TUNNEL_VXLAN;
 792                                 }
 793                         } else if (info.l4_proto == IPPROTO_GRE) {
 794                                 struct simple_gre_hdr *gre_hdr;
 795
 796                                 gre_hdr = (struct simple_gre_hdr *)
 797                                         ((char *)l3_hdr + info.l3_len);
 798                                 parse_gre(gre_hdr, &info);
 799                                 if (info.is_tunnel)
 800                                         tx_ol_flags |= PKT_TX_TUNNEL_GRE;
 801                         } else if (info.l4_proto == IPPROTO_IPIP) {
 802                                 void *encap_ip_hdr;
 803
 804                                 encap_ip_hdr = (char *)l3_hdr + info.l3_len;
 805                                 parse_encap_ip(encap_ip_hdr, &info);
 806                                 if (info.is_tunnel)
 807                                         tx_ol_flags |= PKT_TX_TUNNEL_IPIP;
 808                         }
 809                 }
 810
 811                 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 812                 if (info.is_tunnel) {
 813                         outer_l3_hdr = l3_hdr;
 814                         l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
 815                 }
 816
 817                 /* step 2: depending on user command line configuration,
 818                  * recompute checksum either in software or flag the
 819                  * mbuf to offload the calculation to the NIC. If TSO
 820                  * is configured, prepare the mbuf for TCP segmentation. */
 821
 822                 /* process checksums of inner headers first */
 823                 tx_ol_flags |= process_inner_cksums(l3_hdr, &info,
 824                         tx_offloads);
 825
 826                 /* Then process outer headers if any. Note that the software
 827                  * checksum will be wrong if one of the inner checksums is
 828                  * processed in hardware. */
 829                 if (info.is_tunnel == 1) {
 830                         tx_ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
 831                                         tx_offloads,
 832                                         !!(tx_ol_flags & PKT_TX_TCP_SEG));
 833                 }
 834
 835                 /* step 3: fill the mbuf meta data (flags and header lengths) */
 836
 837                 m->tx_offload = 0;
 838                 if (info.is_tunnel == 1) {
 839                         if (info.tunnel_tso_segsz ||
 840                             (tx_offloads &
 841                              DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 842                             (tx_offloads &
 843                              DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 844                             (tx_ol_flags & PKT_TX_OUTER_IPV6)) {
 845                                 m->outer_l2_len = info.outer_l2_len;
 846                                 m->outer_l3_len = info.outer_l3_len;
 847                                 m->l2_len = info.l2_len;
 848                                 m->l3_len = info.l3_len;
 849                                 m->l4_len = info.l4_len;
 850                                 m->tso_segsz = info.tunnel_tso_segsz;
 851                         }
 852                         else {
 853                                 /* if there is a outer UDP cksum
 854                                    processed in sw and the inner in hw,
 855                                    the outer checksum will be wrong as
 856                                    the payload will be modified by the
 857                                    hardware */
 858                                 m->l2_len = info.outer_l2_len +
 859                                         info.outer_l3_len + info.l2_len;
 860                                 m->l3_len = info.l3_len;
 861                                 m->l4_len = info.l4_len;
 862                         }
 863                 } else {
 864                         /* this is only useful if an offload flag is
 865                          * set, but it does not hurt to fill it in any
 866                          * case */
 867                         m->l2_len = info.l2_len;
 868                         m->l3_len = info.l3_len;
 869                         m->l4_len = info.l4_len;
 870                         m->tso_segsz = info.tso_segsz;
 871                 }
 872                 m->ol_flags = tx_ol_flags;
 873
 874                 /* Do split & copy for the packet. */
 875                 if (tx_pkt_split != TX_PKT_SPLIT_OFF) {
 876                         p = pkt_copy_split(m);
 877                         if (p != NULL) {
 878                                 rte_pktmbuf_free(m);
 879                                 m = p;
 880                                 pkts_burst[i] = m;
 881                         }
 882                 }
 883
 884                 /* if verbose mode is enabled, dump debug info */
 885                 if (verbose_level > 0) {
 886                         char buf[256];
 887
 888                         printf("-----------------\n");
 889                         printf("port=%u, mbuf=%p, pkt_len=%u, nb_segs=%u:\n",
 890                                 fs->rx_port, m, m->pkt_len, m->nb_segs);
 891                         /* dump rx parsed packet info */
 892                         rte_get_rx_ol_flag_list(rx_ol_flags, buf, sizeof(buf));
 893                         printf("rx: l2_len=%d ethertype=%x l3_len=%d "
 894                                 "l4_proto=%d l4_len=%d flags=%s\n",
 895                                 info.l2_len, rte_be_to_cpu_16(info.ethertype),
 896                                 info.l3_len, info.l4_proto, info.l4_len, buf);
 897                         if (rx_ol_flags & PKT_RX_LRO)
 898                                 printf("rx: m->lro_segsz=%u\n", m->tso_segsz);
 899                         if (info.is_tunnel == 1)
 900                                 printf("rx: outer_l2_len=%d outer_ethertype=%x "
 901                                         "outer_l3_len=%d\n", info.outer_l2_len,
 902                                         rte_be_to_cpu_16(info.outer_ethertype),
 903                                         info.outer_l3_len);
 904                         /* dump tx packet info */
 905                         if ((tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
 906                                             DEV_TX_OFFLOAD_UDP_CKSUM |
 907                                             DEV_TX_OFFLOAD_TCP_CKSUM |
 908                                             DEV_TX_OFFLOAD_SCTP_CKSUM)) ||
 909                                 info.tso_segsz != 0)
 910                                 printf("tx: m->l2_len=%d m->l3_len=%d "
 911                                         "m->l4_len=%d\n",
 912                                         m->l2_len, m->l3_len, m->l4_len);
 913                         if (info.is_tunnel == 1) {
 914                                 if ((tx_offloads &
 915                                     DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM) ||
 916                                     (tx_offloads &
 917                                     DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) ||
 918                                     (tx_ol_flags & PKT_TX_OUTER_IPV6))
 919                                         printf("tx: m->outer_l2_len=%d "
 920                                                 "m->outer_l3_len=%d\n",
 921                                                 m->outer_l2_len,
 922                                                 m->outer_l3_len);
 923                                 if (info.tunnel_tso_segsz != 0 &&
 924                                                 (m->ol_flags & PKT_TX_TCP_SEG))
 925                                         printf("tx: m->tso_segsz=%d\n",
 926                                                 m->tso_segsz);
 927                         } else if (info.tso_segsz != 0 &&
 928                                         (m->ol_flags & PKT_TX_TCP_SEG))
 929                                 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
 930                         rte_get_tx_ol_flag_list(m->ol_flags, buf, sizeof(buf));
 931                         printf("tx: flags=%s", buf);
 932                         printf("\n");
 933                 }
 934         }
 935
 936         if (unlikely(gro_enable)) {
 937                 if (gro_flush_cycles == GRO_DEFAULT_FLUSH_CYCLES) {
 938                         nb_rx = rte_gro_reassemble_burst(pkts_burst, nb_rx,
 939                                         &(gro_ports[fs->rx_port].param));
 940                 } else {
 941                         gro_ctx = current_fwd_lcore()->gro_ctx;
 942                         nb_rx = rte_gro_reassemble(pkts_burst, nb_rx, gro_ctx);
 943
 944                         if (++fs->gro_times >= gro_flush_cycles) {
 945                                 gro_pkts_num = rte_gro_get_pkt_count(gro_ctx);
 946                                 if (gro_pkts_num > MAX_PKT_BURST - nb_rx)
 947                                         gro_pkts_num = MAX_PKT_BURST - nb_rx;
 948
 949                                 nb_rx += rte_gro_timeout_flush(gro_ctx, 0,
 950                                                 RTE_GRO_TCP_IPV4,
 951                                                 &pkts_burst[nb_rx],
 952                                                 gro_pkts_num);
 953                                 fs->gro_times = 0;
 954                         }
 955                 }
 956         }
 957
 958         if (gso_ports[fs->tx_port].enable == 0)
 959                 tx_pkts_burst = pkts_burst;
 960         else {
 961                 gso_ctx = &(current_fwd_lcore()->gso_ctx);
 962                 gso_ctx->gso_size = gso_max_segment_size;
 963                 for (i = 0; i < nb_rx; i++) {
 964                         ret = rte_gso_segment(pkts_burst[i], gso_ctx,
 965                                         &gso_segments[nb_segments],
 966                                         GSO_MAX_PKT_BURST - nb_segments);
 967                         if (ret >= 0)
 968                                 nb_segments += ret;
 969                         else {
 970                                 TESTPMD_LOG(DEBUG, "Unable to segment packet");
 971                                 rte_pktmbuf_free(pkts_burst[i]);
 972                         }
 973                 }
 974
 975                 tx_pkts_burst = gso_segments;
 976                 nb_rx = nb_segments;
 977         }
 978
 979         nb_prep = rte_eth_tx_prepare(fs->tx_port, fs->tx_queue,
 980                         tx_pkts_burst, nb_rx);
 981         if (nb_prep != nb_rx)
 982                 printf("Preparing packet burst to transmit failed: %s\n",
 983                                 rte_strerror(rte_errno));
 984
 985         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, tx_pkts_burst,
 986                         nb_prep);
 987
 988         /*
 989          * Retry if necessary
 990          */
 991         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
 992                 retry = 0;
 993                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
 994                         rte_delay_us(burst_tx_delay_time);
 995                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 996                                         &tx_pkts_burst[nb_tx], nb_rx - nb_tx);
 997                 }
 998         }
 999         fs->tx_packets += nb_tx;
1000         fs->rx_bad_ip_csum += rx_bad_ip_csum;
1001         fs->rx_bad_l4_csum += rx_bad_l4_csum;
1002         fs->rx_bad_outer_l4_csum += rx_bad_outer_l4_csum;
1003
1004 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
1005         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
1006 #endif
1007         if (unlikely(nb_tx < nb_rx)) {
1008                 fs->fwd_dropped += (nb_rx - nb_tx);
1009                 do {
1010                         rte_pktmbuf_free(tx_pkts_burst[nb_tx]);
1011                 } while (++nb_tx < nb_rx);
1012         }
1013
1014 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
1015         end_tsc = rte_rdtsc();
1016         core_cycles = (end_tsc - start_tsc);
1017         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
1018 #endif
1019 }
1020
1021 struct fwd_engine csum_fwd_engine = {
1022         .fwd_mode_name  = "csum",
1023         .port_fwd_begin = NULL,
1024         .port_fwd_end   = NULL,
1025         .packet_fwd     = pkt_burst_checksum_forward,
1026 };