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\n%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\n%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 static_always_inline void
 103 tso_segment_vxlan_tunnel_headers_fixup (vlib_main_t * vm, vlib_buffer_t * b,
 104                                         generic_header_offset_t * gho)
 105 {
 106   u8 proto = 0;
 107   ip4_header_t *ip4 = 0;
 108   ip6_header_t *ip6 = 0;
 109   udp_header_t *udp = 0;
 110
 111   ip4 =
 112     (ip4_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
 113   ip6 =
 114     (ip6_header_t *) (vlib_buffer_get_current (b) + gho->outer_l3_hdr_offset);
 115   udp =
 116     (udp_header_t *) (vlib_buffer_get_current (b) + gho->outer_l4_hdr_offset);
 117
 118   if (gho->gho_flags & GHO_F_OUTER_IP4)
 119     {
 120       proto = ip4->protocol;
 121       ip4->length =
 122         clib_host_to_net_u16 (b->current_length - gho->outer_l3_hdr_offset);
 123       ip4->checksum = ip4_header_checksum (ip4);
 124     }
 125   else if (gho->gho_flags & GHO_F_OUTER_IP6)
 126     {
 127       proto = ip6->protocol;
 128       ip6->payload_length =
 129         clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
 130     }
 131   if (proto == IP_PROTOCOL_UDP)
 132     {
 133       int bogus;
 134       udp->length =
 135         clib_host_to_net_u16 (b->current_length - gho->outer_l4_hdr_offset);
 136       udp->checksum = 0;
 137       if (gho->gho_flags & GHO_F_OUTER_IP6)
 138         {
 139           udp->checksum =
 140             ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
 141         }
 142       else if (gho->gho_flags & GHO_F_OUTER_IP4)
 143         {
 144           udp->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
 145         }
 146       /* FIXME: it should be OUTER_UDP_CKSUM */
 147       vnet_buffer_offload_flags_clear (b, VNET_BUFFER_OFFLOAD_F_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_l2, 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           vnet_buffer_offload_flags_clear (b0,
 286                                            VNET_BUFFER_OFFLOAD_F_TCP_CKSUM);
 287         }
 288     }
 289   else
 290     {
 291       ip4->length =
 292         clib_host_to_net_u16 (b0->current_length - gho->l3_hdr_offset);
 293       if (gho->gho_flags & GHO_F_IP4)
 294         ip4->checksum = ip4_header_checksum (ip4);
 295       if (gho->gho_flags & GHO_F_TCP)
 296         {
 297           tcp->checksum = 0;
 298           tcp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip4);
 299         }
 300       vnet_buffer_offload_flags_clear (b0, (VNET_BUFFER_OFFLOAD_F_IP_CKSUM |
 301                                             VNET_BUFFER_OFFLOAD_F_TCP_CKSUM));
 302     }
 303
 304   if (!is_l2 && ((gho->gho_flags & GHO_F_TUNNEL) == 0))
 305     {
 306       u32 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
 307
 308       ip_adjacency_t *adj0 = adj_get (adj_index0);
 309
 310       if (adj0->lookup_next_index == IP_LOOKUP_NEXT_MIDCHAIN &&
 311           adj0->sub_type.midchain.fixup_func)
 312         /* calls e.g. ipip44_fixup */
 313         adj0->sub_type.midchain.fixup_func
 314           (vm, adj0, b0, adj0->sub_type.midchain.fixup_data);
 315     }
 316 }
 317
 318 /**
 319  * Allocate the necessary number of ptd->split_buffers,
 320  * and segment the possibly chained buffer(s) from b0 into
 321  * there.
 322  *
 323  * Return the cumulative number of bytes sent or zero
 324  * if allocation failed.
 325  */
 326
 327 static_always_inline u32
 328 tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
 329                     u32 sbi0, vlib_buffer_t * sb0,
 330                     generic_header_offset_t * gho, u32 n_bytes_b0, int is_l2,
 331                     int is_ip6)
 332 {
 333   u32 n_tx_bytes = 0;
 334   u16 gso_size = vnet_buffer2 (sb0)->gso_size;
 335
 336   u8 save_tcp_flags = 0;
 337   u8 tcp_flags_no_fin_psh = 0;
 338   u32 next_tcp_seq = 0;
 339
 340   tcp_header_t *tcp =
 341     (tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
 342   next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
 343   /* store original flags for last packet and reset FIN and PSH */
 344   save_tcp_flags = tcp->flags;
 345   tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH);
 346   tcp->checksum = 0;
 347
 348   u32 default_bflags =
 349     sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT);
 350   u16 l234_sz = gho->hdr_sz;
 351   int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
 352   next_tcp_seq += first_data_size;
 353
 354   if (PREDICT_FALSE
 355       (!tso_alloc_tx_bufs
 356        (vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size, first_data_size, gho)))
 357     return 0;
 358
 359   vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
 360   tso_init_buf_from_template_base (b0, sb0, default_bflags,
 361                                    l234_sz + first_data_size);
 362
 363   u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
 364   if (total_src_left)
 365     {
 366       /* Need to copy more segments */
 367       u8 *src_ptr, *dst_ptr;
 368       u16 src_left, dst_left;
 369       /* current source buffer */
 370       vlib_buffer_t *csb0 = sb0;
 371       u32 csbi0 = sbi0;
 372       /* current dest buffer */
 373       vlib_buffer_t *cdb0;
 374       u16 dbi = 1;              /* the buffer [0] is b0 */
 375
 376       src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
 377       src_left = sb0->current_length - l234_sz - first_data_size;
 378
 379       tso_fixup_segmented_buf (vm, b0, tcp_flags_no_fin_psh, is_l2, is_ip6,
 380                                gho);
 381
 382       /* grab a second buffer and prepare the loop */
 383       ASSERT (dbi < vec_len (ptd->split_buffers));
 384       cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 385       tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
 386                                   &dst_left, next_tcp_seq, default_bflags,
 387                                   gho);
 388
 389       /* an arbitrary large number to catch the runaway loops */
 390       int nloops = 2000;
 391       while (total_src_left)
 392         {
 393           if (nloops-- <= 0)
 394             clib_panic ("infinite loop detected");
 395           u16 bytes_to_copy = clib_min (src_left, dst_left);
 396
 397           clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);
 398
 399           src_left -= bytes_to_copy;
 400           src_ptr += bytes_to_copy;
 401           total_src_left -= bytes_to_copy;
 402           dst_left -= bytes_to_copy;
 403           dst_ptr += bytes_to_copy;
 404           next_tcp_seq += bytes_to_copy;
 405           cdb0->current_length += bytes_to_copy;
 406
 407           if (0 == src_left)
 408             {
 409               int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
 410               u32 next_bi = csb0->next_buffer;
 411
 412               /* init src to the next buffer in chain */
 413               if (has_next)
 414                 {
 415                   csbi0 = next_bi;
 416                   csb0 = vlib_get_buffer (vm, csbi0);
 417                   src_left = csb0->current_length;
 418                   src_ptr = vlib_buffer_get_current (csb0);
 419                 }
 420               else
 421                 {
 422                   ASSERT (total_src_left == 0);
 423                   break;
 424                 }
 425             }
 426           if (0 == dst_left && total_src_left)
 427             {
 428               n_tx_bytes += cdb0->current_length;
 429               tso_fixup_segmented_buf (vm, cdb0, tcp_flags_no_fin_psh, is_l2,
 430                                        is_ip6, gho);
 431               ASSERT (dbi < vec_len (ptd->split_buffers));
 432               cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 433               tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
 434                                           gso_size, &dst_ptr, &dst_left,
 435                                           next_tcp_seq, default_bflags, gho);
 436             }
 437         }
 438
 439       tso_fixup_segmented_buf (vm, cdb0, save_tcp_flags, is_l2, is_ip6, gho);
 440
 441       n_tx_bytes += cdb0->current_length;
 442     }
 443   n_tx_bytes += b0->current_length;
 444   return n_tx_bytes;
 445 }
 446
 447 static_always_inline void
 448 drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
 449                            vlib_node_runtime_t * node, u32 * pbi0,
 450                            u32 sw_if_index, u32 drop_error_code)
 451 {
 452   u32 thread_index = vm->thread_index;
 453
 454   vlib_simple_counter_main_t *cm;
 455   cm =
 456     vec_elt_at_index (vnm->interface_main.sw_if_counters,
 457                       VNET_INTERFACE_COUNTER_TX_ERROR);
 458   vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);
 459
 460   vlib_error_drop_buffers (vm, node, pbi0,
 461                            /* buffer stride */ 1,
 462                            /* n_buffers */ 1,
 463                            VNET_INTERFACE_OUTPUT_NEXT_DROP,
 464                            node->node_index, drop_error_code);
 465 }
 466
 467 static_always_inline uword
 468 vnet_gso_node_inline (vlib_main_t * vm,
 469                       vlib_node_runtime_t * node,
 470                       vlib_frame_t * frame,
 471                       vnet_main_t * vnm,
 472                       vnet_hw_interface_t * hi,
 473                       int is_l2, int is_ip4, int is_ip6, int do_segmentation)
 474 {
 475   u32 *to_next;
 476   u32 next_index = node->cached_next_index;
 477   u32 *from = vlib_frame_vector_args (frame);
 478   u32 n_left_from = frame->n_vectors;
 479   u32 *from_end = from + n_left_from;
 480   u32 thread_index = vm->thread_index;
 481   vnet_interface_main_t *im = &vnm->interface_main;
 482   vnet_interface_per_thread_data_t *ptd =
 483     vec_elt_at_index (im->per_thread_data, thread_index);
 484   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 485
 486   vlib_get_buffers (vm, from, b, n_left_from);
 487
 488   while (n_left_from > 0)
 489     {
 490       u32 n_left_to_next;
 491
 492       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 493
 494       if (!do_segmentation)
 495         while (from + 8 <= from_end && n_left_to_next >= 4)
 496           {
 497             u32 bi0, bi1, bi2, bi3;
 498             u32 next0, next1, next2, next3;
 499             u32 swif0, swif1, swif2, swif3;
 500             gso_trace_t *t0, *t1, *t2, *t3;
 501             vnet_hw_interface_t *hi0, *hi1, *hi2, *hi3;
 502
 503             /* Prefetch next iteration. */
 504             vlib_prefetch_buffer_header (b[4], LOAD);
 505             vlib_prefetch_buffer_header (b[5], LOAD);
 506             vlib_prefetch_buffer_header (b[6], LOAD);
 507             vlib_prefetch_buffer_header (b[7], LOAD);
 508
 509             bi0 = from[0];
 510             bi1 = from[1];
 511             bi2 = from[2];
 512             bi3 = from[3];
 513             to_next[0] = bi0;
 514             to_next[1] = bi1;
 515             to_next[2] = bi2;
 516             to_next[3] = bi3;
 517
 518             swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 519             swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 520             swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
 521             swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
 522
 523             if (PREDICT_FALSE (hi->sw_if_index != swif0))
 524               {
 525                 hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 526                 if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 527                     (b[0]->flags & VNET_BUFFER_F_GSO))
 528                   break;
 529               }
 530             if (PREDICT_FALSE (hi->sw_if_index != swif1))
 531               {
 532                 hi1 = vnet_get_sup_hw_interface (vnm, swif1);
 533                 if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 534                     (b[1]->flags & VNET_BUFFER_F_GSO))
 535                   break;
 536               }
 537             if (PREDICT_FALSE (hi->sw_if_index != swif2))
 538               {
 539                 hi2 = vnet_get_sup_hw_interface (vnm, swif2);
 540                 if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 541                     (b[2]->flags & VNET_BUFFER_F_GSO))
 542                   break;
 543               }
 544             if (PREDICT_FALSE (hi->sw_if_index != swif3))
 545               {
 546                 hi3 = vnet_get_sup_hw_interface (vnm, swif3);
 547                 if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 548                     (b[3]->flags & VNET_BUFFER_F_GSO))
 549                   break;
 550               }
 551
 552             if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 553               {
 554                 t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 555                 t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 556                 t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 557                 t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 558                 vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
 559                                                    is_ip4, is_ip6);
 560               }
 561             if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 562               {
 563                 t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
 564                 t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
 565                 t1->gso_size = vnet_buffer2 (b[1])->gso_size;
 566                 t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
 567                 vnet_generic_header_offset_parser (b[1], &t1->gho, is_l2,
 568                                                    is_ip4, is_ip6);
 569               }
 570             if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
 571               {
 572                 t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
 573                 t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
 574                 t2->gso_size = vnet_buffer2 (b[2])->gso_size;
 575                 t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
 576                 vnet_generic_header_offset_parser (b[2], &t2->gho, is_l2,
 577                                                    is_ip4, is_ip6);
 578               }
 579             if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
 580               {
 581                 t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
 582                 t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
 583                 t3->gso_size = vnet_buffer2 (b[3])->gso_size;
 584                 t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
 585                 vnet_generic_header_offset_parser (b[3], &t3->gho, is_l2,
 586                                                    is_ip4, is_ip6);
 587               }
 588
 589             from += 4;
 590             to_next += 4;
 591             n_left_to_next -= 4;
 592             n_left_from -= 4;
 593
 594             next0 = next1 = 0;
 595             next2 = next3 = 0;
 596             vnet_feature_next (&next0, b[0]);
 597             vnet_feature_next (&next1, b[1]);
 598             vnet_feature_next (&next2, b[2]);
 599             vnet_feature_next (&next3, b[3]);
 600             vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
 601                                              n_left_to_next, bi0, bi1, bi2,
 602                                              bi3, next0, next1, next2, next3);
 603             b += 4;
 604           }
 605
 606       while (from + 1 <= from_end && n_left_to_next > 0)
 607         {
 608           u32 bi0, swif0;
 609           gso_trace_t *t0;
 610           vnet_hw_interface_t *hi0;
 611           u32 next0 = 0;
 612           u32 do_segmentation0 = 0;
 613
 614           swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 615           if (PREDICT_FALSE (hi->sw_if_index != swif0))
 616             {
 617               hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 618               if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 619                   (b[0]->flags & VNET_BUFFER_F_GSO))
 620                 do_segmentation0 = 1;
 621             }
 622           else
 623             do_segmentation0 = do_segmentation;
 624
 625           /* speculatively enqueue b0 to the current next frame */
 626           to_next[0] = bi0 = from[0];
 627           to_next += 1;
 628           n_left_to_next -= 1;
 629           from += 1;
 630           n_left_from -= 1;
 631
 632           if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 633             {
 634               t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 635               t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 636               t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 637               t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 638               vnet_generic_header_offset_parser (b[0], &t0->gho, is_l2,
 639                                                  is_ip4, is_ip6);
 640             }
 641
 642           if (do_segmentation0)
 643             {
 644               if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
 645                 {
 646                   /*
 647                    * Undo the enqueue of the b0 - it is not going anywhere,
 648                    * and will be freed either after it's segmented or
 649                    * when dropped, if there is no buffers to segment into.
 650                    */
 651                   to_next -= 1;
 652                   n_left_to_next += 1;
 653                   /* undo the counting. */
 654                   generic_header_offset_t gho = { 0 };
 655                   u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 656                   u32 n_tx_bytes = 0;
 657                   u32 inner_is_ip6 = is_ip6;
 658
 659                   vnet_generic_header_offset_parser (b[0], &gho, is_l2,
 660                                                      is_ip4, is_ip6);
 661
 662                   if (PREDICT_FALSE (gho.gho_flags & GHO_F_TUNNEL))
 663                     {
 664                       if (PREDICT_FALSE
 665                           (gho.gho_flags & (GHO_F_GRE_TUNNEL |
 666                                             GHO_F_GENEVE_TUNNEL)))
 667                         {
 668                           /* not supported yet */
 669                           drop_one_buffer_and_count (vm, vnm, node, from - 1,
 670                                                      hi->sw_if_index,
 671                                                      VNET_INTERFACE_OUTPUT_ERROR_UNHANDLED_GSO_TYPE);
 672                           b += 1;
 673                           continue;
 674                         }
 675
 676                       vnet_get_inner_header (b[0], &gho);
 677
 678                       n_bytes_b0 -= gho.outer_hdr_sz;
 679                       inner_is_ip6 = (gho.gho_flags & GHO_F_IP6) != 0;
 680                     }
 681
 682                   n_tx_bytes =
 683                     tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
 684                                         is_l2, inner_is_ip6);
 685
 686                   if (PREDICT_FALSE (n_tx_bytes == 0))
 687                     {
 688                       drop_one_buffer_and_count (vm, vnm, node, from - 1,
 689                                                  hi->sw_if_index,
 690                                                  VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
 691                       b += 1;
 692                       continue;
 693                     }
 694
 695
 696                   if (PREDICT_FALSE (gho.gho_flags & GHO_F_VXLAN_TUNNEL))
 697                     {
 698                       vnet_get_outer_header (b[0], &gho);
 699                       n_tx_bytes +=
 700                         tso_segment_vxlan_tunnel_fixup (vm, ptd, b[0], &gho);
 701                     }
 702                   else
 703                     if (PREDICT_FALSE
 704                         (gho.gho_flags & (GHO_F_IPIP_TUNNEL |
 705                                           GHO_F_IPIP6_TUNNEL)))
 706                     {
 707                       vnet_get_outer_header (b[0], &gho);
 708                       n_tx_bytes +=
 709                         tso_segment_ipip_tunnel_fixup (vm, ptd, b[0], &gho);
 710                     }
 711
 712                   u16 n_tx_bufs = vec_len (ptd->split_buffers);
 713                   u32 *from_seg = ptd->split_buffers;
 714
 715                   while (n_tx_bufs > 0)
 716                     {
 717                       u32 sbi0;
 718                       vlib_buffer_t *sb0;
 719                       while (n_tx_bufs > 0 && n_left_to_next > 0)
 720                         {
 721                           sbi0 = to_next[0] = from_seg[0];
 722                           sb0 = vlib_get_buffer (vm, sbi0);
 723                           ASSERT (sb0->current_length > 0);
 724                           to_next += 1;
 725                           from_seg += 1;
 726                           n_left_to_next -= 1;
 727                           n_tx_bufs -= 1;
 728                           next0 = 0;
 729                           vnet_feature_next (&next0, sb0);
 730                           vlib_validate_buffer_enqueue_x1 (vm, node,
 731                                                            next_index,
 732                                                            to_next,
 733                                                            n_left_to_next,
 734                                                            sbi0, next0);
 735                         }
 736                       vlib_put_next_frame (vm, node, next_index,
 737                                            n_left_to_next);
 738                       if (n_tx_bufs > 0)
 739                         vlib_get_next_frame (vm, node, next_index,
 740                                              to_next, n_left_to_next);
 741                     }
 742                   /* The buffers were enqueued. Reset the length */
 743                   _vec_len (ptd->split_buffers) = 0;
 744                   /* Free the now segmented buffer */
 745                   vlib_buffer_free_one (vm, bi0);
 746                   b += 1;
 747                   continue;
 748                 }
 749             }
 750
 751           vnet_feature_next (&next0, b[0]);
 752           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 753                                            n_left_to_next, bi0, next0);
 754           b += 1;
 755         }
 756       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 757     }
 758
 759   return frame->n_vectors;
 760 }
 761
 762 static_always_inline uword
 763 vnet_gso_inline (vlib_main_t * vm,
 764                  vlib_node_runtime_t * node, vlib_frame_t * frame, int is_l2,
 765                  int is_ip4, int is_ip6)
 766 {
 767   vnet_main_t *vnm = vnet_get_main ();
 768   vnet_hw_interface_t *hi;
 769
 770   if (frame->n_vectors > 0)
 771     {
 772       u32 *from = vlib_frame_vector_args (frame);
 773       vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
 774       hi = vnet_get_sup_hw_interface (vnm,
 775                                       vnet_buffer (b)->sw_if_index[VLIB_TX]);
 776
 777       if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
 778         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 779                                      is_l2, is_ip4, is_ip6,
 780                                      /* do_segmentation */ 0);
 781       else
 782         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 783                                      is_l2, is_ip4, is_ip6,
 784                                      /* do_segmentation */ 1);
 785     }
 786   return 0;
 787 }
 788
 789 VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 790                                 vlib_frame_t * frame)
 791 {
 792   return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 1 /* ip4 */ ,
 793                           0 /* ip6 */ );
 794 }
 795
 796 VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 797                                 vlib_frame_t * frame)
 798 {
 799   return vnet_gso_inline (vm, node, frame, 1 /* l2 */ , 0 /* ip4 */ ,
 800                           1 /* ip6 */ );
 801 }
 802
 803 VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 804                              vlib_frame_t * frame)
 805 {
 806   return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 1 /* ip4 */ ,
 807                           0 /* ip6 */ );
 808 }
 809
 810 VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 811                              vlib_frame_t * frame)
 812 {
 813   return vnet_gso_inline (vm, node, frame, 0 /* l2 */ , 0 /* ip4 */ ,
 814                           1 /* ip6 */ );
 815 }
 816
 817 /* *INDENT-OFF* */
 818
 819 VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
 820   .vector_size = sizeof (u32),
 821   .format_trace = format_gso_trace,
 822   .type = VLIB_NODE_TYPE_INTERNAL,
 823   .n_errors = 0,
 824   .n_next_nodes = 0,
 825   .name = "gso-l2-ip4",
 826 };
 827
 828 VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
 829   .vector_size = sizeof (u32),
 830   .format_trace = format_gso_trace,
 831   .type = VLIB_NODE_TYPE_INTERNAL,
 832   .n_errors = 0,
 833   .n_next_nodes = 0,
 834   .name = "gso-l2-ip6",
 835 };
 836
 837 VLIB_REGISTER_NODE (gso_ip4_node) = {
 838   .vector_size = sizeof (u32),
 839   .format_trace = format_gso_trace,
 840   .type = VLIB_NODE_TYPE_INTERNAL,
 841   .n_errors = 0,
 842   .n_next_nodes = 0,
 843   .name = "gso-ip4",
 844 };
 845
 846 VLIB_REGISTER_NODE (gso_ip6_node) = {
 847   .vector_size = sizeof (u32),
 848   .format_trace = format_gso_trace,
 849   .type = VLIB_NODE_TYPE_INTERNAL,
 850   .n_errors = 0,
 851   .n_next_nodes = 0,
 852   .name = "gso-ip6",
 853 };
 854
 855 VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
 856   .arc_name = "l2-output-ip4",
 857   .node_name = "gso-l2-ip4",
 858   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 859 };
 860
 861 VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
 862   .arc_name = "l2-output-ip6",
 863   .node_name = "gso-l2-ip6",
 864   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 865 };
 866
 867 VNET_FEATURE_INIT (gso_ip4_node, static) = {
 868   .arc_name = "ip4-output",
 869   .node_name = "gso-ip4",
 870   .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
 871 };
 872
 873 VNET_FEATURE_INIT (gso_ip6_node, static) = {
 874   .arc_name = "ip6-output",
 875   .node_name = "gso-ip6",
 876   .runs_before = VNET_FEATURES ("ipsec6-output-feature"),
 877 };
 878
 879 /*
 880  * fd.io coding-style-patch-verification: ON
 881  *
 882  * Local Variables:
 883  * eval: (c-set-style "gnu")
 884  * End:
 885  */