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/ip/icmp46_packet.h>
  23 #include <vnet/ip/ip4.h>
  24 #include <vnet/ip/ip6.h>
  25 #include <vnet/udp/udp_packet.h>
  26
  27 typedef struct
  28 {
  29   u32 flags;
  30   u16 gso_size;
  31   u8 gso_l4_hdr_sz;
  32 } gso_trace_t;
  33
  34 static u8 *
  35 format_gso_trace (u8 * s, va_list * args)
  36 {
  37   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  38   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  39   gso_trace_t *t = va_arg (*args, gso_trace_t *);
  40
  41   if (t->flags & VNET_BUFFER_F_GSO)
  42     {
  43       s = format (s, "gso_sz %d gso_l4_hdr_sz %d",
  44                   t->gso_size, t->gso_l4_hdr_sz);
  45     }
  46   else
  47     {
  48       s = format (s, "non-gso buffer");
  49     }
  50
  51   return s;
  52 }
  53
  54 static_always_inline u16
  55 tso_alloc_tx_bufs (vlib_main_t * vm,
  56                    vnet_interface_per_thread_data_t * ptd,
  57                    vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz,
  58                    u16 gso_size)
  59 {
  60   u16 size =
  61     clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz);
  62
  63   /* rounded-up division */
  64   u16 n_bufs = (n_bytes_b0 - l234_sz + (size - 1)) / size;
  65   u16 n_alloc;
  66
  67   ASSERT (n_bufs > 0);
  68   vec_validate (ptd->split_buffers, n_bufs - 1);
  69
  70   n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs);
  71   if (n_alloc < n_bufs)
  72     {
  73       vlib_buffer_free (vm, ptd->split_buffers, n_alloc);
  74       return 0;
  75     }
  76   return n_alloc;
  77 }
  78
  79 static_always_inline void
  80 tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0,
  81                                  u32 flags, u16 length)
  82 {
  83   nb0->current_data = b0->current_data;
  84   nb0->total_length_not_including_first_buffer = 0;
  85   nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
  86   nb0->trace_handle = b0->trace_handle;
  87   clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
  88   clib_memcpy_fast (vlib_buffer_get_current (nb0),
  89                     vlib_buffer_get_current (b0), length);
  90   nb0->current_length = length;
  91 }
  92
  93 static_always_inline void
  94 tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0,
  95                             vlib_buffer_t * b0, u16 template_data_sz,
  96                             u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left,
  97                             u32 next_tcp_seq, u32 flags,
  98                             gso_header_offset_t * gho)
  99 {
 100   tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz);
 101
 102   *p_dst_left =
 103     clib_min (gso_size,
 104               vlib_buffer_get_default_data_size (vm) - (template_data_sz +
 105                                                         nb0->current_data));
 106   *p_dst_ptr = vlib_buffer_get_current (nb0) + template_data_sz;
 107
 108   tcp_header_t *tcp =
 109     (tcp_header_t *) (vlib_buffer_get_current (nb0) + gho->l4_hdr_offset);
 110   tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq);
 111 }
 112
 113 static_always_inline void
 114 tso_fixup_segmented_buf (vlib_buffer_t * b0, u8 tcp_flags, int is_ip6,
 115                          gso_header_offset_t * gho)
 116 {
 117   ip4_header_t *ip4 =
 118     (ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
 119   ip6_header_t *ip6 =
 120     (ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
 121   tcp_header_t *tcp =
 122     (tcp_header_t *) (vlib_buffer_get_current (b0) + gho->l4_hdr_offset);
 123
 124   tcp->flags = tcp_flags;
 125
 126   if (is_ip6)
 127     ip6->payload_length =
 128       clib_host_to_net_u16 (b0->current_length -
 129                             (gho->l4_hdr_offset - gho->l2_hdr_offset));
 130   else
 131     ip4->length =
 132       clib_host_to_net_u16 (b0->current_length -
 133                             (gho->l3_hdr_offset - gho->l2_hdr_offset));
 134 }
 135
 136 /**
 137  * Allocate the necessary number of ptd->split_buffers,
 138  * and segment the possibly chained buffer(s) from b0 into
 139  * there.
 140  *
 141  * Return the cumulative number of bytes sent or zero
 142  * if allocation failed.
 143  */
 144
 145 static_always_inline u32
 146 tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
 147                     u32 sbi0, vlib_buffer_t * sb0, gso_header_offset_t * gho,
 148                     u32 n_bytes_b0, int is_ip6)
 149 {
 150   u32 n_tx_bytes = 0;
 151   u16 gso_size = vnet_buffer2 (sb0)->gso_size;
 152
 153   int l4_hdr_sz = gho->l4_hdr_sz;
 154   u8 save_tcp_flags = 0;
 155   u8 tcp_flags_no_fin_psh = 0;
 156   u32 next_tcp_seq = 0;
 157
 158   tcp_header_t *tcp =
 159     (tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
 160   next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
 161   /* store original flags for last packet and reset FIN and PSH */
 162   save_tcp_flags = tcp->flags;
 163   tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH);
 164   tcp->checksum = 0;
 165
 166   u32 default_bflags =
 167     sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT);
 168   u16 l234_sz = gho->l4_hdr_offset + l4_hdr_sz - gho->l2_hdr_offset;
 169   int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
 170   next_tcp_seq += first_data_size;
 171
 172   if (PREDICT_FALSE
 173       (!tso_alloc_tx_bufs (vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size)))
 174     return 0;
 175
 176   vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
 177   tso_init_buf_from_template_base (b0, sb0, default_bflags,
 178                                    l234_sz + first_data_size);
 179
 180   u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
 181   if (total_src_left)
 182     {
 183       /* Need to copy more segments */
 184       u8 *src_ptr, *dst_ptr;
 185       u16 src_left, dst_left;
 186       /* current source buffer */
 187       vlib_buffer_t *csb0 = sb0;
 188       u32 csbi0 = sbi0;
 189       /* current dest buffer */
 190       vlib_buffer_t *cdb0;
 191       u16 dbi = 1;              /* the buffer [0] is b0 */
 192
 193       src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
 194       src_left = sb0->current_length - l234_sz - first_data_size;
 195
 196       tso_fixup_segmented_buf (b0, tcp_flags_no_fin_psh, is_ip6, gho);
 197
 198       /* grab a second buffer and prepare the loop */
 199       ASSERT (dbi < vec_len (ptd->split_buffers));
 200       cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 201       tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
 202                                   &dst_left, next_tcp_seq, default_bflags,
 203                                   gho);
 204
 205       /* an arbitrary large number to catch the runaway loops */
 206       int nloops = 2000;
 207       while (total_src_left)
 208         {
 209           if (nloops-- <= 0)
 210             clib_panic ("infinite loop detected");
 211           u16 bytes_to_copy = clib_min (src_left, dst_left);
 212
 213           clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);
 214
 215           src_left -= bytes_to_copy;
 216           src_ptr += bytes_to_copy;
 217           total_src_left -= bytes_to_copy;
 218           dst_left -= bytes_to_copy;
 219           dst_ptr += bytes_to_copy;
 220           next_tcp_seq += bytes_to_copy;
 221           cdb0->current_length += bytes_to_copy;
 222
 223           if (0 == src_left)
 224             {
 225               int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
 226               u32 next_bi = csb0->next_buffer;
 227
 228               /* init src to the next buffer in chain */
 229               if (has_next)
 230                 {
 231                   csbi0 = next_bi;
 232                   csb0 = vlib_get_buffer (vm, csbi0);
 233                   src_left = csb0->current_length;
 234                   src_ptr = vlib_buffer_get_current (csb0);
 235                 }
 236               else
 237                 {
 238                   ASSERT (total_src_left == 0);
 239                   break;
 240                 }
 241             }
 242           if (0 == dst_left && total_src_left)
 243             {
 244               n_tx_bytes += cdb0->current_length;
 245               tso_fixup_segmented_buf (cdb0, tcp_flags_no_fin_psh, is_ip6,
 246                                        gho);
 247               ASSERT (dbi < vec_len (ptd->split_buffers));
 248               cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 249               tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
 250                                           gso_size, &dst_ptr, &dst_left,
 251                                           next_tcp_seq, default_bflags, gho);
 252             }
 253         }
 254
 255       tso_fixup_segmented_buf (cdb0, save_tcp_flags, is_ip6, gho);
 256
 257       n_tx_bytes += cdb0->current_length;
 258     }
 259   n_tx_bytes += b0->current_length;
 260   return n_tx_bytes;
 261 }
 262
 263 static_always_inline void
 264 drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
 265                            vlib_node_runtime_t * node, u32 * pbi0,
 266                            u32 sw_if_index, u32 drop_error_code)
 267 {
 268   u32 thread_index = vm->thread_index;
 269
 270   vlib_simple_counter_main_t *cm;
 271   cm =
 272     vec_elt_at_index (vnm->interface_main.sw_if_counters,
 273                       VNET_INTERFACE_COUNTER_TX_ERROR);
 274   vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);
 275
 276   vlib_error_drop_buffers (vm, node, pbi0,
 277                            /* buffer stride */ 1,
 278                            /* n_buffers */ 1,
 279                            VNET_INTERFACE_OUTPUT_NEXT_DROP,
 280                            node->node_index, drop_error_code);
 281 }
 282
 283 static_always_inline uword
 284 vnet_gso_node_inline (vlib_main_t * vm,
 285                       vlib_node_runtime_t * node,
 286                       vlib_frame_t * frame,
 287                       vnet_main_t * vnm,
 288                       vnet_hw_interface_t * hi,
 289                       int is_ip6, int do_segmentation)
 290 {
 291   u32 *to_next;
 292   u32 next_index = node->cached_next_index;
 293   u32 *from = vlib_frame_vector_args (frame);
 294   u32 n_left_from = frame->n_vectors;
 295   u32 *from_end = from + n_left_from;
 296   u32 thread_index = vm->thread_index;
 297   vnet_interface_main_t *im = &vnm->interface_main;
 298   vnet_interface_per_thread_data_t *ptd =
 299     vec_elt_at_index (im->per_thread_data, thread_index);
 300   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 301
 302   vlib_get_buffers (vm, from, b, n_left_from);
 303
 304   while (n_left_from > 0)
 305     {
 306       u32 n_left_to_next;
 307
 308       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 309
 310       if (!do_segmentation)
 311         while (from + 8 <= from_end && n_left_to_next >= 4)
 312           {
 313             u32 bi0, bi1, bi2, bi3;
 314             u32 next0, next1, next2, next3;
 315             u32 swif0, swif1, swif2, swif3;
 316             gso_trace_t *t0, *t1, *t2, *t3;
 317             vnet_hw_interface_t *hi0, *hi1, *hi2, *hi3;
 318
 319             /* Prefetch next iteration. */
 320             vlib_prefetch_buffer_header (b[4], LOAD);
 321             vlib_prefetch_buffer_header (b[5], LOAD);
 322             vlib_prefetch_buffer_header (b[6], LOAD);
 323             vlib_prefetch_buffer_header (b[7], LOAD);
 324
 325             bi0 = from[0];
 326             bi1 = from[1];
 327             bi2 = from[2];
 328             bi3 = from[3];
 329             to_next[0] = bi0;
 330             to_next[1] = bi1;
 331             to_next[2] = bi2;
 332             to_next[3] = bi3;
 333
 334             swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 335             swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 336             swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
 337             swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
 338
 339             if (PREDICT_FALSE (hi->sw_if_index != swif0))
 340               {
 341                 hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 342                 if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 343                     (b[0]->flags & VNET_BUFFER_F_GSO))
 344                   break;
 345               }
 346             if (PREDICT_FALSE (hi->sw_if_index != swif1))
 347               {
 348                 hi1 = vnet_get_sup_hw_interface (vnm, swif0);
 349                 if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 350                     (b[1]->flags & VNET_BUFFER_F_GSO))
 351                   break;
 352               }
 353             if (PREDICT_FALSE (hi->sw_if_index != swif2))
 354               {
 355                 hi2 = vnet_get_sup_hw_interface (vnm, swif0);
 356                 if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 357                     (b[2]->flags & VNET_BUFFER_F_GSO))
 358                   break;
 359               }
 360             if (PREDICT_FALSE (hi->sw_if_index != swif3))
 361               {
 362                 hi3 = vnet_get_sup_hw_interface (vnm, swif0);
 363                 if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 364                     (b[3]->flags & VNET_BUFFER_F_GSO))
 365                   break;
 366               }
 367
 368             if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 369               {
 370                 t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 371                 t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 372                 t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 373                 t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 374               }
 375             if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 376               {
 377                 t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
 378                 t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
 379                 t1->gso_size = vnet_buffer2 (b[1])->gso_size;
 380                 t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
 381               }
 382             if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
 383               {
 384                 t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
 385                 t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
 386                 t2->gso_size = vnet_buffer2 (b[2])->gso_size;
 387                 t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
 388               }
 389             if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
 390               {
 391                 t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
 392                 t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
 393                 t3->gso_size = vnet_buffer2 (b[3])->gso_size;
 394                 t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
 395               }
 396
 397             from += 4;
 398             to_next += 4;
 399             n_left_to_next -= 4;
 400             n_left_from -= 4;
 401
 402             next0 = next1 = 0;
 403             next2 = next3 = 0;
 404             vnet_feature_next (&next0, b[0]);
 405             vnet_feature_next (&next1, b[1]);
 406             vnet_feature_next (&next2, b[2]);
 407             vnet_feature_next (&next3, b[3]);
 408             vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
 409                                              n_left_to_next, bi0, bi1, bi2,
 410                                              bi3, next0, next1, next2, next3);
 411             b += 4;
 412           }
 413
 414       while (from + 1 <= from_end && n_left_to_next > 0)
 415         {
 416           u32 bi0, swif0;
 417           gso_trace_t *t0;
 418           vnet_hw_interface_t *hi0;
 419           u32 next0 = 0;
 420           u32 do_segmentation0 = 0;
 421
 422           swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 423           if (PREDICT_FALSE (hi->sw_if_index != swif0))
 424             {
 425               hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 426               if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 427                   (b[0]->flags & VNET_BUFFER_F_GSO))
 428                 do_segmentation0 = 1;
 429             }
 430           else
 431             do_segmentation0 = do_segmentation;
 432
 433           /* speculatively enqueue b0 to the current next frame */
 434           to_next[0] = bi0 = from[0];
 435           to_next += 1;
 436           n_left_to_next -= 1;
 437           from += 1;
 438           n_left_from -= 1;
 439
 440           if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 441             {
 442               t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 443               t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 444               t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 445               t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 446             }
 447
 448           if (do_segmentation0)
 449             {
 450               if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
 451                 {
 452                   /*
 453                    * Undo the enqueue of the b0 - it is not going anywhere,
 454                    * and will be freed either after it's segmented or
 455                    * when dropped, if there is no buffers to segment into.
 456                    */
 457                   to_next -= 1;
 458                   n_left_to_next += 1;
 459                   /* undo the counting. */
 460                   gso_header_offset_t gho;
 461                   u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 462                   u32 n_tx_bytes = 0;
 463
 464                   gho = vnet_gso_header_offset_parser (b[0], is_ip6);
 465                   n_tx_bytes =
 466                     tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
 467                                         is_ip6);
 468
 469                   if (PREDICT_FALSE (n_tx_bytes == 0))
 470                     {
 471                       drop_one_buffer_and_count (vm, vnm, node, from - 1,
 472                                                  hi->sw_if_index,
 473                                                  VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
 474                       b += 1;
 475                       continue;
 476                     }
 477
 478                   u16 n_tx_bufs = vec_len (ptd->split_buffers);
 479                   u32 *from_seg = ptd->split_buffers;
 480
 481                   while (n_tx_bufs > 0)
 482                     {
 483                       u32 sbi0;
 484                       vlib_buffer_t *sb0;
 485                       if (n_tx_bufs >= n_left_to_next)
 486                         {
 487                           while (n_left_to_next > 0)
 488                             {
 489                               sbi0 = to_next[0] = from_seg[0];
 490                               sb0 = vlib_get_buffer (vm, sbi0);
 491                               to_next += 1;
 492                               from_seg += 1;
 493                               n_left_to_next -= 1;
 494                               n_tx_bufs -= 1;
 495                               vnet_feature_next (&next0, sb0);
 496                               vlib_validate_buffer_enqueue_x1 (vm, node,
 497                                                                next_index,
 498                                                                to_next,
 499                                                                n_left_to_next,
 500                                                                sbi0, next0);
 501                             }
 502                           vlib_put_next_frame (vm, node, next_index,
 503                                                n_left_to_next);
 504                           vlib_get_new_next_frame (vm, node, next_index,
 505                                                    to_next, n_left_to_next);
 506                         }
 507                       while (n_tx_bufs > 0)
 508                         {
 509                           sbi0 = to_next[0] = from_seg[0];
 510                           sb0 = vlib_get_buffer (vm, sbi0);
 511                           to_next += 1;
 512                           from_seg += 1;
 513                           n_left_to_next -= 1;
 514                           n_tx_bufs -= 1;
 515                           vnet_feature_next (&next0, sb0);
 516                           vlib_validate_buffer_enqueue_x1 (vm, node,
 517                                                            next_index,
 518                                                            to_next,
 519                                                            n_left_to_next,
 520                                                            sbi0, next0);
 521                         }
 522                     }
 523                   /* The buffers were enqueued. Reset the length */
 524                   _vec_len (ptd->split_buffers) = 0;
 525                   /* Free the now segmented buffer */
 526                   vlib_buffer_free_one (vm, bi0);
 527                   b += 1;
 528                   continue;
 529                 }
 530             }
 531
 532           vnet_feature_next (&next0, b[0]);
 533           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 534                                            n_left_to_next, bi0, next0);
 535           b += 1;
 536         }
 537       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 538     }
 539
 540   return frame->n_vectors;
 541 }
 542
 543 static_always_inline uword
 544 vnet_gso_inline (vlib_main_t * vm,
 545                  vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip6)
 546 {
 547   vnet_main_t *vnm = vnet_get_main ();
 548   vnet_hw_interface_t *hi;
 549
 550   if (frame->n_vectors > 0)
 551     {
 552       u32 *from = vlib_frame_vector_args (frame);
 553       vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
 554       hi = vnet_get_sup_hw_interface (vnm,
 555                                       vnet_buffer (b)->sw_if_index[VLIB_TX]);
 556
 557       if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
 558         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 559                                      is_ip6, /* do_segmentation */ 0);
 560       else
 561         return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 562                                      is_ip6, /* do_segmentation */ 1);
 563     }
 564   return 0;
 565 }
 566
 567 VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 568                                 vlib_frame_t * frame)
 569 {
 570   return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
 571 }
 572
 573 VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 574                                 vlib_frame_t * frame)
 575 {
 576   return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
 577 }
 578
 579 VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 580                              vlib_frame_t * frame)
 581 {
 582   return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
 583 }
 584
 585 VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 586                              vlib_frame_t * frame)
 587 {
 588   return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
 589 }
 590
 591 /* *INDENT-OFF* */
 592
 593 VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
 594   .vector_size = sizeof (u32),
 595   .format_trace = format_gso_trace,
 596   .type = VLIB_NODE_TYPE_INTERNAL,
 597   .n_errors = 0,
 598   .n_next_nodes = 0,
 599   .name = "gso-l2-ip4",
 600 };
 601
 602 VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
 603   .vector_size = sizeof (u32),
 604   .format_trace = format_gso_trace,
 605   .type = VLIB_NODE_TYPE_INTERNAL,
 606   .n_errors = 0,
 607   .n_next_nodes = 0,
 608   .name = "gso-l2-ip6",
 609 };
 610
 611 VLIB_REGISTER_NODE (gso_ip4_node) = {
 612   .vector_size = sizeof (u32),
 613   .format_trace = format_gso_trace,
 614   .type = VLIB_NODE_TYPE_INTERNAL,
 615   .n_errors = 0,
 616   .n_next_nodes = 0,
 617   .name = "gso-ip4",
 618 };
 619
 620 VLIB_REGISTER_NODE (gso_ip6_node) = {
 621   .vector_size = sizeof (u32),
 622   .format_trace = format_gso_trace,
 623   .type = VLIB_NODE_TYPE_INTERNAL,
 624   .n_errors = 0,
 625   .n_next_nodes = 0,
 626   .name = "gso-ip6",
 627 };
 628
 629 VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
 630   .arc_name = "l2-output-ip4",
 631   .node_name = "gso-l2-ip4",
 632   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 633 };
 634
 635 VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
 636   .arc_name = "l2-output-ip6",
 637   .node_name = "gso-l2-ip6",
 638   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 639 };
 640
 641 VNET_FEATURE_INIT (gso_ip4_node, static) = {
 642   .arc_name = "ip4-output",
 643   .node_name = "gso-ip4",
 644   .runs_after = VNET_FEATURES ("ipsec4-output-feature"),
 645   .runs_before = VNET_FEATURES ("interface-output"),
 646 };
 647
 648 VNET_FEATURE_INIT (gso_ip6_node, static) = {
 649   .arc_name = "ip6-output",
 650   .node_name = "gso-ip6",
 651   .runs_after = VNET_FEATURES ("ipsec6-output-feature"),
 652   .runs_before = VNET_FEATURES ("interface-output"),
 653 };
 654
 655 /*
 656  * fd.io coding-style-patch-verification: ON
 657  *
 658  * Local Variables:
 659  * eval: (c-set-style "gnu")
 660  * End:
 661  */