src/vnet/gso/node.c

   1 /*
   2  * Copyright (c) 2018 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vlib/vlib.h>
  17 #include <vnet/vnet.h>
  18 #include <vppinfra/error.h>
  19 #include <vnet/ethernet/ethernet.h>
  20 #include <vnet/feature/feature.h>
  21 #include <vnet/gso/gso.h>
  22 #include <vnet/gso/hdr_offset_parser.h>
  23 #include <vnet/ip/icmp46_packet.h>
  24 #include <vnet/ip/ip4.h>
  25 #include <vnet/ip/ip6.h>
  26 #include <vnet/udp/udp_packet.h>
  27
  28 typedef struct
  29 {
  30   u32 flags;
  31   u16 gso_size;
  32   u8 gso_l4_hdr_sz;
  33   generic_header_offset_t gho;
  34 } gso_trace_t;
  35
  36 static u8 *
  37 format_gso_trace (u8 * s, va_list * args)
  38 {
  39   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  40   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  41   gso_trace_t *t = va_arg (*args, gso_trace_t *);
  42
  43   if (t->flags & VNET_BUFFER_F_GSO)
  44     {
  45       s = format (s, "gso_sz %d gso_l4_hdr_sz %d %U",
  46                   t->gso_size, t->gso_l4_hdr_sz, format_generic_header_offset,
  47                   &t->gho);
  48     }
  49   else
  50     {
  51       s =
  52         format (s, "non-gso buffer %U", format_generic_header_offset,
  53                 &t->gho);
  54     }
  55
  56   return s;
  57 }
  58
  59 static_always_inline u16
  60 tso_segment_ipip_tunnel_fixup (vlib_main_t * vm,
  61                                vnet_interface_per_thread_data_t * ptd,
  62                                vlib_buffer_t * sb0,
  63                                generic_header_offset_t * gho)
  64 {
  65   u16 n_tx_bufs = vec_len (ptd->split_buffers);
  66   u16 i = 0, n_tx_bytes = 0;
  67
  68   while (i < n_tx_bufs)
  69     {
  70       vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[i]);
  71       vnet_get_outer_header (b0, gho);
  72       clib_memcpy_fast (vlib_buffer_get_current (b0),
  73                         vlib_buffer_get_current (sb0), gho->outer_hdr_sz);
  74
  75       ip4_header_t *ip4 =
  76         (ip4_header_t *) (vlib_buffer_get_current (b0) +
  77                           gho->outer_l3_hdr_offset);
  78       ip6_header_t *ip6 =
  79         (ip6_header_t *) (vlib_buffer_get_current (b0) +
  80                           gho->outer_l3_hdr_offset);
  81
  82       if (gho->gho_flags & GHO_F_OUTER_IP4)
  83         {
  84           ip4->length =
  85             clib_host_to_net_u16 (b0->current_length -
  86                                   gho->outer_l3_hdr_offset);
  87           ip4->checksum = ip4_header_checksum (ip4);
  88         }
  89       else if (gho->gho_flags & GHO_F_OUTER_IP6)
  90         {
  91           ip6->payload_length =
  92             clib_host_to_net_u16 (b0->current_length -
  93                                   gho->outer_l4_hdr_offset);
  94         }
  95
  96       n_tx_bytes += gho->outer_hdr_sz;
  97       i++;
  98     }
  99   return n_tx_bytes;
 100
 101 }
 102
 103 static_always_inline void
 104 tso_segment_vxlan_tunnel_headers_fixup (vlib_main_t * vm, vlib_buffer_t * b,
 105                                         generic_header_offset_t * gho)
 106 {
 107   u8 proto = 0;
 108   ip4_header_t *ip4 = 0;
 109   ip6_header_t *ip6 = 0;
 110   udp_header_t *udp = 0;
 111
 112   ip4 =
 113     (ip4_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
 114   ip6 =
 115     (ip6_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
 116   udp =
 117     (udp_header_t *) (vlib_buffer_get_current (b) + gho->outer_l4_hdr_offset);
 118
 119   if (gho->gho_flags & GHO_F_OUTER_IP4)
 120     {
 121       proto = ip4->protocol;
 122       ip4->length =
 123         clib_host_to_net_u16 (b->current_length - gho->outer_l3_hdr_offset);
 124       ip4->checksum = ip4_header_checksum (ip4);
 125     }
 126   else if (gho->gho_flags & GHO_F_OUTER_IP6)
 127     {
 128       proto = ip6->protocol;
 129       ip6->payload_length =
 130         clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
 131     }
 132   if (proto == IP_PROTOCOL_UDP)
 133     {
 134       int bogus;
 135       udp->length =
 136         clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
 137       udp->checksum = 0;
 138       if (gho->gho_flags & GHO_F_OUTER_IP6)
 139         {
 140           udp->checksum =
 141             ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
 142         }
 143       else if (gho->gho_flags & GHO_F_OUTER_IP4)
 144         {
 145           udp->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
 146         }
 147       b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 148     }
 149 }
 150
 151 static_always_inline u16
 152 tso_segment_vxlan_tunnel_fixup (vlib_main_t * vm,
 153                                 vnet_interface_per_thread_data_t * ptd,
 154                                 vlib_buffer_t * sb0,
 155                                 generic_header_offset_t * gho)
 156 {
 157   u16 n_tx_bufs = vec_len (ptd->split_buffers);
 158   u16 i = 0, n_tx_bytes = 0;
 159
 160   while (i < n_tx_bufs)
 161     {
 162       vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[i]);
 163       vnet_get_outer_header (b0, gho);
 164       clib_memcpy_fast (vlib_buffer_get_current (b0),
 165                         vlib_buffer_get_current (sb0), gho->outer_hdr_sz);
 166
 167       tso_segment_vxlan_tunnel_headers_fixup (vm, b0, gho);
 168       n_tx_bytes += gho->outer_hdr_sz;
 169       i++;
 170     }
 171   return n_tx_bytes;
 172 }
 173
 174 static_always_inline u16
 175 tso_alloc_tx_bufs (vlib_main_t * vm,
 176                    vnet_interface_per_thread_data_t * ptd,
 177                    vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz,
 178                    u16 gso_size, u16 first_data_size,
 179                    generic_header_offset_t * gho)
 180 {
 181   u16 n_alloc, size;
 182   u16 first_packet_length = l234_sz + first_data_size;
 183
 184   /*
 185    * size is the amount of data per segmented buffer except the 1st
 186    * segmented buffer.
 187    * l2_hdr_offset is an offset == current_data of vlib_buffer_t.
 188    * l234_sz is hdr_sz from l2_hdr_offset.
 189    */
 190   size =
 191     clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz
 192               - gho->l2_hdr_offset);
 193
 194   /*
 195    * First segmented buffer length is calculated separately.
 196    * As it may contain less data than gso_size (when gso_size is
 197    * greater than current_length of 1st buffer from GSO chained
 198    * buffers) and/or size calculated above.
 199    */
 200   u16 n_bufs = 1;
 201
 202   /*
 203    * Total packet length minus first packet length including l234 header.
 204    * rounded-up division
 205    */
 206   ASSERT (n_bytes_b0 > first_packet_length);
 207   n_bufs += ((n_bytes_b0 - first_packet_length + (size - 1)) / size);
 208
 209   vec_validate (ptd->split_buffers, n_bufs - 1);
 210
 211   n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs);
 212   if (n_alloc < n_bufs)
 213     {
 214       vlib_buffer_free (vm, ptd->split_buffers, n_alloc);
 215       return 0;
 216     }
 217   return n_alloc;
 218 }
 219
 220 static_always_inline void
 221 tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0,
 222                                  u32 flags, u16 length)
 223 {
 224   /* copying objects from cacheline 0 */
 225   nb0->current_data = b0->current_data;
 226   nb0->current_length = length;
 227   nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
 228   nb0->flow_id = b0->flow_id;
 229   nb0->error = b0->error;
 230   nb0->current_config_index = b0->current_config_index;
 231   clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
 232
 233   /* copying objects from cacheline 1 */
 234   nb0->trace_handle = b0->trace_handle;
 235   nb0->total_length_not_including_first_buffer = 0;
 236
 237   /* copying data */
 238   clib_memcpy_fast (vlib_buffer_get_current (nb0),
 239                     vlib_buffer_get_current (b0), length);
 240 }
 241
 242 static_always_inline void
 243 tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0,
 244                             vlib_buffer_t * b0, u16 template_data_sz,
 245                             u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left,
 246                             u32 next_tcp_seq, u32 flags,
 247                             generic_header_offset_t * gho)
 248 {
 249   tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz);
 250
 251   *p_dst_left =
 252     clib_min (gso_size,
 253               vlib_buffer_get_default_data_size (vm) - (template_data_sz +
 254                                                         nb0->current_data));
 255   *p_dst_ptr = vlib_buffer_get_current (nb0) + template_data_sz;
 256
 257   tcp_header_t *tcp =
 258     (tcp_header_t *) (vlib_buffer_get_current (nb0) + gho->l4_hdr_offset);
 259   tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq);
 260 }
 261
 262 static_always_inline void
 263 tso_fixup_segmented_buf (vlib_main_t * vm, vlib_buffer_t * b0, u8 tcp_flags,
 264                          int is_ip6, generic_header_offset_t * gho)
 265 {
 266   ip4_header_t *ip4 =
 267     (ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
 268   ip6_header_t *ip6 =
 269     (ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
 270   tcp_header_t *tcp =
 271     (tcp_header_t *) (vlib_buffer_get_current (b0) + gho->l4_hdr_offset);
 272
 273   tcp->flags = tcp_flags;
 274
 275   if (is_ip6)
 276     {
 277       ip6->payload_length =
 278         clib_host_to_net_u16 (b0->current_length - gho->l4_hdr_offset);
 279       if (gho->gho_flags & GHO_F_TCP)
 280         {
 281           int bogus = 0;
 282           tcp->checksum = 0;
 283           tcp->checksum =
 284             ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6, &bogus);
 285           b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 286         }
 287     }
 288   else
 289     {
 290       ip4->length =
 291         clib_host_to_net_u16 (b0->current_length - gho->l3_hdr_offset);
 292       if (gho->gho_flags & GHO_F_IP4)
 293         ip4->checksum = ip4_header_checksum (ip4);
 294       if (gho->gho_flags & GHO_F_TCP)
 295         {
 296           tcp->checksum = 0;
 297           tcp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip4);
 298         }
 299       b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 300       b0->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
 301     }
 302
 303   if ((gho->gho_flags & GHO_F_TUNNEL) == 0)
 304     {
 305       u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
 306
 307       ip_adjacency_t *adj0 = adj_get (adj_index0);
 308
 309       if (adj0->lookup_next_index == IP_LOOKUP_NEXT_MIDCHAIN &&
 310           adj0->sub_type.midchain.fixup_func)
 311         /* calls e.g. ipip44_fixup */
 312         adj0->sub_type.midchain.fixup_func
 313           (vm, adj0, b0, adj0->sub_type.midchain.fixup_data);
 314     }
 315 }
 316
 317 /**
 318  * Allocate the necessary number of ptd->split_buffers,
 319  * and segment the possibly chained buffer(s) from b0 into
 320  * there.
 321  *
 322  * Return the cumulative number of bytes sent or zero
 323  * if allocation failed.
 324  */
 325
 326 static_always_inline u32
 327 tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
 328                     u32 sbi0, vlib_buffer_t * sb0,
 329                     generic_header_offset_t * gho, u32 n_bytes_b0, int is_ip6)
 330 {
 331   u32 n_tx_bytes = 0;
 332   u16 gso_size = vnet_buffer2 (sb0)->gso_size;
 333
 334   u8 save_tcp_flags = 0;
 335   u8 tcp_flags_no_fin_psh = 0;
 336   u32 next_tcp_seq = 0;
 337
 338   tcp_header_t *tcp =
 339     (tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
 340   next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
 341   /* store original flags for last packet and reset FIN and PSH */
 342   save_tcp_flags = tcp->flags;
 343   tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH);
 344   tcp->checksum = 0;
 345
 346   u32 default_bflags =
 347     sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT);
 348   u16 l234_sz = gho->hdr_sz;
 349   int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
 350   next_tcp_seq += first_data_size;
 351
 352   if (PREDICT_FALSE
 353       (!tso_alloc_tx_bufs
 354        (vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size, first_data_size, gho)))
 355     return 0;
 356
 357   vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
 358   tso_init_buf_from_template_base (b0, sb0, default_bflags,
 359                                    l234_sz + first_data_size);
 360
 361   u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
 362   if (total_src_left)
 363     {
 364       /* Need to copy more segments */
 365       u8 *src_ptr, *dst_ptr;
 366       u16 src_left, dst_left;
 367       /* current source buffer */
 368       vlib_buffer_t *csb0 = sb0;
 369       u32 csbi0 = sbi0;
 370       /* current dest buffer */
 371       vlib_buffer_t *cdb0;
 372       u16 dbi = 1;              /* the buffer [0] is b0 */
 373
 374       src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
 375       src_left = sb0->current_length - l234_sz - first_data_size;
 376
 377       tso_fixup_segmented_buf (vm, b0, tcp_flags_no_fin_psh, is_ip6, gho);
 378
 379       /* grab a second buffer and prepare the loop */
 380       ASSERT (dbi < vec_len (ptd->split_buffers));
 381       cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 382       tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
 383                                   &dst_left, next_tcp_seq, default_bflags,
 384                                   gho);
 385
 386       /* an arbitrary large number to catch the runaway loops */
 387       int nloops = 2000;
 388       while (total_src_left)
 389         {
 390           if (nloops-- <= 0)
 391             clib_panic ("infinite loop detected");
 392           u16 bytes_to_copy = clib_min (src_left, dst_left);
 393
 394           clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);
 395
 396           src_left -= bytes_to_copy;
 397           src_ptr += bytes_to_copy;
 398           total_src_left -= bytes_to_copy;
 399           dst_left -= bytes_to_copy;
 400           dst_ptr += bytes_to_copy;
 401           next_tcp_seq += bytes_to_copy;
 402           cdb0->current_length += bytes_to_copy;
 403
 404           if (0 == src_left)
 405             {
 406               int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
 407               u32 next_bi = csb0->next_buffer;
 408
 409               /* init src to the next buffer in chain */
 410               if (has_next)
 411                 {
 412                   csbi0 = next_bi;
 413                   csb0 = vlib_get_buffer (vm, csbi0);
 414                   src_left = csb0->current_length;
 415                   src_ptr = vlib_buffer_get_current (csb0);
 416                 }
 417               else
 418                 {
 419                   ASSERT (total_src_left == 0);
 420                   break;
 421                 }
 422             }
 423           if (0 == dst_left && total_src_left)
 424             {
 425               n_tx_bytes += cdb0->current_length;
 426               tso_fixup_segmented_buf (vm, cdb0, tcp_flags_no_fin_psh, is_ip6,
 427                                        gho);
 428               ASSERT (dbi < vec_len (ptd->split_buffers));
 429               cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 430               tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
 431                                           gso_size, &dst_ptr, &dst_left,
 432                                           next_tcp_seq, default_bflags, gho);
 433             }
 434         }
 435
 436       tso_fixup_segmented_buf (vm, cdb0, save_tcp_flags, is_ip6, gho);
 437
 438       n_tx_bytes += cdb0->current_length;
 439     }
 440   n_tx_bytes += b0->current_length;
 441   return n_tx_bytes;
 442 }
 443
 444 static_always_inline void
 445 drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
 446                            vlib_node_runtime_t * node, u32 * pbi0,
 447                            u32 sw_if_index, u32 drop_error_code)
 448 {
 449   u32 thread_index = vm->thread_index;
 450
 451   vlib_simple_counter_main_t *cm;
 452   cm =
 453     vec_elt_at_index (vnm->interface_main.sw_if_counters,
 454                       VNET_INTERFACE_COUNTER_TX_ERROR);
 455   vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);
 456
 457   vlib_error_drop_buffers (vm, node, pbi0,
 458                            /* buffer stride */ 1,
 459                            /* n_buffers */ 1,
 460                            VNET_INTERFACE_OUTPUT_NEXT_DROP,
 461                            node->node_index, drop_error_code);
 462 }
 463
 464 static_always_inline uword
 465 vnet_gso_node_inline (vlib_main_t * vm,
 466                       vlib_node_runtime_t * node,
 467                       vlib_frame_t * frame,
 468                       vnet_main_t * vnm,
 469                       vnet_hw_interface_t * hi,
 470                       int is_l2, int is_ip4, int is_ip6, int do_segmentation)
 471 {
 472   u32 *to_next;
 473   u32 next_index = node->cached_next_index;
 474   u32 *from = vlib_frame_vector_args (frame);
 475   u32 n_left_from = frame->n_vectors;
 476   u32 *from_end = from + n_left_from;
 477   u32 thread_index = vm->thread_index;
 478   vnet_interface_main_t *im = &vnm->interface_main;
 479   vnet_interface_per_thread_data_t *ptd =
 480     vec_elt_at_index (im->per_thread_data, thread_index);
 481   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 482
 483   vlib_get_buffers (vm, from, b, n_left_from);
 484
 485   while (n_left_from > 0)
 486     {
 487       u32 n_left_to_next;
 488
 489       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 490
 491       if (!do_segmentation)
 492         while (from + 8 <= from_end && n_left_to_next >= 4)
 493           {
 494             u32 bi0, bi1, bi2, bi3;
 495             u32 next0, next1, next2, next3;
 496             u32 swif0, swif1, swif2, swif3;
 497             gso_trace_t *t0, *t1, *t2, *t3;
 498             vnet_hw_interface_t *hi0, *hi1, *hi2, *hi3;
 499
 500             /* Prefetch next iteration. */
 501             vlib_prefetch_buffer_header (b[4], LOAD);
 502             vlib_prefetch_buffer_header (b[5], LOAD);
 503             vlib_prefetch_buffer_header (b[6], LOAD);
 504             vlib_prefetch_buffer_header (b[7], LOAD);
 505
 506             bi0 = from[0];
 507             bi1 = from[1];
 508             bi2 = from[2];
 509             bi3 = from[3];
 510             to_next[0] = bi0;
 511             to_next[1] = bi1;
 512             to_next[2] = bi2;
 513             to_next[3] = bi3;
 514
 515             swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 516             swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 517             swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
 518             swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
 519
 520             if (PREDICT_FALSE (hi->sw_if_index != swif0))
 521               {
 522                 hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 523                 if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 524                     (b[0]->flags & VNET_BUFFER_F_GSO))
 525                   break;
 526               }
 527             if (PREDICT_FALSE (hi->sw_if_index != swif1))
 528               {
 529                 hi1 = vnet_get_sup_hw_interface (vnm, swif1);
 530                 if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 531                     (b[1]->flags & VNET_BUFFER_F_GSO))
 532                   break;
 533               }
 534             if (PREDICT_FALSE (hi->sw_if_index != swif2))
 535               {
 536                 hi2 = vnet_get_sup_hw_interface (vnm, swif2);
 537                 if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 538                     (b[2]->flags & VNET_BUFFER_F_GSO))
 539                   break;
 540               }
 541             if (PREDICT_FALSE (hi->sw_if_index != swif3))
 542               {
 543                 hi3 = vnet_get_sup_hw_interface (vnm, swif3);
 544                 if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 545                     (b[3]->flags & VNET_BUFFER_F_GSO))
 546                   break;
 547               }
 548
 549             if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 550               {
 551                 t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 552                 t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 553                 t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 554                 t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 555                 vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
 556                                                    is_ip4, is_ip6);
 557               }
 558             if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 559               {
 560                 t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
 561                 t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
 562                 t1->gso_size = vnet_buffer2 (b[1])->gso_size;
 563                 t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
 564                 vnet_generic_header_offset_parser (b[1], &t1->gho, is_l2,
 565                                                    is_ip4, is_ip6);
 566               }
 567             if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
 568               {
 569                 t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
 570                 t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
 571                 t2->gso_size = vnet_buffer2 (b[2])->gso_size;
 572                 t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
 573                 vnet_generic_header_offset_parser (b[2], &t2->gho, is_l2,
 574                                                    is_ip4, is_ip6);
 575               }
 576             if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
 577               {
 578                 t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
 579                 t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
 580                 t3->gso_size = vnet_buffer2 (b[3])->gso_size;
 581                 t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
 582                 vnet_generic_header_offset_parser (b[3], &t3->gho, is_l2,
 583                                                    is_ip4, is_ip6);
 584               }
 585
 586             from += 4;
 587             to_next += 4;
 588             n_left_to_next -= 4;
 589             n_left_from -= 4;
 590
 591             next0 = next1 = 0;
 592             next2 = next3 = 0;
 593             vnet_feature_next (&next0, b[0]);
 594             vnet_feature_next (&next1, b[1]);
 595             vnet_feature_next (&next2, b[2]);
 596             vnet_feature_next (&next3, b[3]);
 597             vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
 598                                              n_left_to_next, bi0, bi1, bi2,
 599                                              bi3, next0, next1, next2, next3);
 600             b += 4;
 601           }
 602
 603       while (from + 1 <= from_end && n_left_to_next > 0)
 604         {
 605           u32 bi0, swif0;
 606           gso_trace_t *t0;
 607           vnet_hw_interface_t *hi0;
 608           u32 next0 = 0;
 609           u32 do_segmentation0 = 0;
 610
 611           swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 612           if (PREDICT_FALSE (hi->sw_if_index != swif0))
 613             {
 614               hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 615               if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 616                   (b[0]->flags & VNET_BUFFER_F_GSO))
 617                 do_segmentation0 = 1;
 618             }
 619           else
 620             do_segmentation0 = do_segmentation;
 621
 622           /* speculatively enqueue b0 to the current next frame */
 623           to_next[0] = bi0 = from[0];
 624           to_next += 1;
 625           n_left_to_next -= 1;
 626           from += 1;
 627           n_left_from -= 1;
 628
 629           if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 630             {
 631               t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 632               t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 633               t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 634               t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 635               vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
 636                                                  is_ip4, is_ip6);
 637             }
 638
 639           if (do_segmentation0)
 640             {
 641               if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
 642                 {
 643                   /*
 644                    * Undo the enqueue of the b0 - it is not going anywhere,
 645                    * and will be freed either after it's segmented or
 646                    * when dropped, if there is no buffers to segment into.
 647                    */
 648                   to_next -= 1;
 649                   n_left_to_next += 1;
 650                   /* undo the counting. */
 651                   generic_header_offset_t gho = { 0 };
 652                   u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 653                   u32 n_tx_bytes = 0;
 654
 655                   vnet_generic_header_offset_parser (b[0], &gho, is_l2,
 656                                                      is_ip4, is_ip6);
 657
 658                   if (PREDICT_FALSE (gho.gho_flags & GHO_F_TUNNEL))
 659                     {
 660                       if (PREDICT_FALSE
 661                           (gho.gho_flags & (GHO_F_GRE_TUNNEL |
 662                                             GHO_F_GENEVE_TUNNEL)))
 663                         {
 664                           /* not supported yet */
 665                           drop_one_buffer_and_count (vm, vnm, node, from - 1,
 666                                                      hi->sw_if_index,
 667                                                      VNET_INTERFACE_OUTPUT_ERROR_UNHANDLED_GSO_TYPE);
 668                           b += 1;
 669                           continue;
 670                         }
 671
 672                       vnet_get_inner_header (b[0], &gho);
 673
 674                       n_bytes_b0 -= gho.outer_hdr_sz;
 675                       is_ip6 = (gho.gho_flags & GHO_F_IP6) != 0;
 676                     }
 677
 678                   n_tx_bytes =
 679                     tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
 680                                         is_ip6);
 681
 682                   if (PREDICT_FALSE (n_tx_bytes == 0))
 683                     {
 684                       drop_one_buffer_and_count (vm, vnm, node, from - 1,
 685                                                  hi->sw_if_index,
 686                                                  VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
 687                       b += 1;
 688                       continue;
 689                     }
 690
 691
 692                   if (PREDICT_FALSE (gho.gho_flags & GHO_F_VXLAN_TUNNEL))
 693                     {
 694                       vnet_get_outer_header (b[0], &gho);
 695                       n_tx_bytes +=
 696                         tso_segment_vxlan_tunnel_fixup (vm, ptd, b[0], &gho);
 697                     }
 698                   else
 699                     if (PREDICT_FALSE
 700                         (gho.gho_flags & (GHO_F_IPIP_TUNNEL |
 701                                           GHO_F_IPIP6_TUNNEL)))
 702                     {
 703                       vnet_get_outer_header (b[0], &gho);
 704                       n_tx_bytes +=
 705                         tso_segment_ipip_tunnel_fixup (vm, ptd, b[0], &gho);
 706                     }
 707
 708                   u16 n_tx_bufs = vec_len (ptd->split_buffers);
 709                   u32 *from_seg = ptd->split_buffers;
 710
 711                   while (n_tx_bufs > 0)
 712                     {
 713                       u32 sbi0;
 714                       vlib_buffer_t *sb0;
 715                       while (n_tx_bufs > 0 && n_left_to_next > 0)
 716                         {
 717                           sbi0 = to_next[0] = from_seg[0];
 718                           sb0 = vlib_get_buffer (vm, sbi0);
 719                           ASSERT (sb0->current_length > 0);
 720                           to_next += 1;
 721                           from_seg += 1;
 722                           n_left_to_next -= 1;
 723                           n_tx_bufs -= 1;
 724                           next0 = 0;
 725                           vnet_feature_next (&next0, sb0);
 726                           vlib_validate_buffer_enqueue_x1 (vm, node,
 727                                                            next_index,
 728                                                            to_next,
 729                                                            n_left_to_next,
 730                                                            sbi0, next0);
 731                         }
 732                       vlib_put_next_frame (vm, node, next_index,
 733                                            n_left_to_next);
 734                       if (n_tx_bufs > 0)
 735                         vlib_get_next_frame (vm, node, next_index,
 736                                              to_next, n_left_to_next);
 737                     }
 738                   /* The buffers were enqueued. Reset the length */
 739                   _vec_len (ptd->split_buffers) = 0;
 740                   /* Free the now segmented buffer */
 741                   vlib_buffer_free_one (vm, bi0);
 742                   b += 1;
 743                   continue;
 744                 }
 745             }
 746
 747           vnet_feature_next (&next0, b[0]);
 748           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 749                                            n_left_to_next, bi0, next0);
 750           b += 1;
 751         }
 752       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 753     }
 754
 755   return frame->n_vectors;
 756 }
 757
 758 static_always_inline uword
 759 vnet_gso_inline (vlib_main_t * vm,
 760                  vlib_node_runtime_t * node, vlib_frame_t * frame, int is_l2,
 761                  int is_ip4, int is_ip6)
 762 {
 763   vnet_main_t *vnm = vnet_get_main ();
 764   vnet_hw_interface_t *hi;
 765
 766   if (frame->n_vectors > 0)
 767     {
 768       u32 *from = vlib_frame_vector_args (frame);
 769       vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
 770       hi = vnet_get_sup_hw_interface (vnm,
 771                                       vnet_buffer (b)->sw_if_index[VLIB_TX]);
 772
 773       if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
 774         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 775                                      is_l2, is_ip4, is_ip6,
 776                                      /* do_segmentation */ 0);
 777       else
 778         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 779                                      is_l2, is_ip4, is_ip6,
 780                                      /* do_segmentation */ 1);
 781     }
 782   return 0;
 783 }
 784
 785 VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 786                                 vlib_frame_t * frame)
 787 {
 788   return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 1 /* ip4 */ ,
 789                           0 /* ip6 */ );
 790 }
 791
 792 VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 793                                 vlib_frame_t * frame)
 794 {
 795   return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 0 /* ip4 */ ,
 796                           1 /* ip6 */ );
 797 }
 798
 799 VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 800                              vlib_frame_t * frame)
 801 {
 802   return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 1 /* ip4 */ ,
 803                           0 /* ip6 */ );
 804 }
 805
 806 VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 807                              vlib_frame_t * frame)
 808 {
 809   return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 0 /* ip4 */ ,
 810                           1 /* ip6 */ );
 811 }
 812
 813 /* *INDENT-OFF* */
 814
 815 VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
 816   .vector_size = sizeof (u32),
 817   .format_trace = format_gso_trace,
 818   .type = VLIB_NODE_TYPE_INTERNAL,
 819   .n_errors = 0,
 820   .n_next_nodes = 0,
 821   .name = "gso-l2-ip4",
 822 };
 823
 824 VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
 825   .vector_size = sizeof (u32),
 826   .format_trace = format_gso_trace,
 827   .type = VLIB_NODE_TYPE_INTERNAL,
 828   .n_errors = 0,
 829   .n_next_nodes = 0,
 830   .name = "gso-l2-ip6",
 831 };
 832
 833 VLIB_REGISTER_NODE (gso_ip4_node) = {
 834   .vector_size = sizeof (u32),
 835   .format_trace = format_gso_trace,
 836   .type = VLIB_NODE_TYPE_INTERNAL,
 837   .n_errors = 0,
 838   .n_next_nodes = 0,
 839   .name = "gso-ip4",
 840 };
 841
 842 VLIB_REGISTER_NODE (gso_ip6_node) = {
 843   .vector_size = sizeof (u32),
 844   .format_trace = format_gso_trace,
 845   .type = VLIB_NODE_TYPE_INTERNAL,
 846   .n_errors = 0,
 847   .n_next_nodes = 0,
 848   .name = "gso-ip6",
 849 };
 850
 851 VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
 852   .arc_name = "l2-output-ip4",
 853   .node_name = "gso-l2-ip4",
 854   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 855 };
 856
 857 VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
 858   .arc_name = "l2-output-ip6",
 859   .node_name = "gso-l2-ip6",
 860   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 861 };
 862
 863 VNET_FEATURE_INIT (gso_ip4_node, static) = {
 864   .arc_name = "ip4-output",
 865   .node_name = "gso-ip4",
 866   .runs_before = VNET_FEATURES ("esp4-encrypt-tun","ipsec4-output-feature"),
 867 };
 868
 869 VNET_FEATURE_INIT (gso_ip6_node, static) = {
 870   .arc_name = "ip6-output",
 871   .node_name = "gso-ip6",
 872   .runs_before = VNET_FEATURES ("esp6-encrypt-tun","ipsec6-output-feature"),
 873 };
 874
 875 /*
 876  * fd.io coding-style-patch-verification: ON
 877  *
 878  * Local Variables:
 879  * eval: (c-set-style "gnu")
 880  * End:
 881  */