src/vnet/gso/node.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2018 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vppinfra/error.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/feature/feature.h>
 #include <vnet/gso/gso.h>
 #include <vnet/ip/icmp46_packet.h>
 #include <vnet/ip/ip4.h>
 #include <vnet/ip/ip6.h>
 #include <vnet/udp/udp_packet.h>

 typedef struct
 {
   u32 flags;
   u16 gso_size;
   u8 gso_l4_hdr_sz;
 } gso_trace_t;

 static u8 *
 format_gso_trace (u8 * s, va_list * args)
 {
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   gso_trace_t *t = va_arg (*args, gso_trace_t *);

   if (t->flags & VNET_BUFFER_F_GSO)
     {
       s = format (s, "gso_sz %d gso_l4_hdr_sz %d",
 		  t->gso_size, t->gso_l4_hdr_sz);
     }
   else
     {
       s = format (s, "non-gso buffer");
     }

   return s;
 }

 static_always_inline u16
 tso_alloc_tx_bufs (vlib_main_t * vm,
 		   vnet_interface_per_thread_data_t * ptd,
 		   vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz,
 		   u16 gso_size)
 {
   u16 size =
     clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz);

   /* rounded-up division */
   u16 n_bufs = (n_bytes_b0 - l234_sz + (size - 1)) / size;
   u16 n_alloc;

   ASSERT (n_bufs > 0);
   vec_validate (ptd->split_buffers, n_bufs - 1);

   n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs);
   if (n_alloc < n_bufs)
     {
       vlib_buffer_free (vm, ptd->split_buffers, n_alloc);
       return 0;
     }
   return n_alloc;
 }

 static_always_inline void
 tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0,
 				 u32 flags, u16 length)
 {
   nb0->current_data = b0->current_data;
   nb0->total_length_not_including_first_buffer = 0;
   nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags;
   nb0->trace_handle = b0->trace_handle;
   clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
   clib_memcpy_fast (vlib_buffer_get_current (nb0),
 		    vlib_buffer_get_current (b0), length);
   nb0->current_length = length;
 }

 static_always_inline void
 tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0,
 			    vlib_buffer_t * b0, u16 template_data_sz,
 			    u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left,
 			    u32 next_tcp_seq, u32 flags,
 			    gso_header_offset_t * gho)
 {
   tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz);

   *p_dst_left =
     clib_min (gso_size,
 	      vlib_buffer_get_default_data_size (vm) - (template_data_sz +
 							nb0->current_data));
   *p_dst_ptr = vlib_buffer_get_current (nb0) + template_data_sz;

   tcp_header_t *tcp =
     (tcp_header_t *) (vlib_buffer_get_current (nb0) + gho->l4_hdr_offset);
   tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq);
 }

 static_always_inline void
 tso_fixup_segmented_buf (vlib_buffer_t * b0, u8 tcp_flags, int is_ip6,
 			 gso_header_offset_t * gho)
 {
   ip4_header_t *ip4 =
     (ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
   ip6_header_t *ip6 =
     (ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
   tcp_header_t *tcp =
     (tcp_header_t *) (vlib_buffer_get_current (b0) + gho->l4_hdr_offset);

   tcp->flags = tcp_flags;

   if (is_ip6)
     ip6->payload_length =
       clib_host_to_net_u16 (b0->current_length -
 			    (gho->l4_hdr_offset - gho->l2_hdr_offset));
   else
     ip4->length =
       clib_host_to_net_u16 (b0->current_length -
 			    (gho->l3_hdr_offset - gho->l2_hdr_offset));
 }

 /**
  * Allocate the necessary number of ptd->split_buffers,
  * and segment the possibly chained buffer(s) from b0 into
  * there.
  *
  * Return the cumulative number of bytes sent or zero
  * if allocation failed.
  */

 static_always_inline u32
 tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
 		    u32 sbi0, vlib_buffer_t * sb0, gso_header_offset_t * gho,
 		    u32 n_bytes_b0, int is_ip6)
 {
   u32 n_tx_bytes = 0;
   u16 gso_size = vnet_buffer2 (sb0)->gso_size;

   int l4_hdr_sz = gho->l4_hdr_sz;
   u8 save_tcp_flags = 0;
   u8 tcp_flags_no_fin_psh = 0;
   u32 next_tcp_seq = 0;

   tcp_header_t *tcp =
     (tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
   next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
   /* store original flags for last packet and reset FIN and PSH */
   save_tcp_flags = tcp->flags;
   tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH);
   tcp->checksum = 0;

   u32 default_bflags =
     sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT);
   u16 l234_sz = gho->l4_hdr_offset + l4_hdr_sz - gho->l2_hdr_offset;
   int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
   next_tcp_seq += first_data_size;

   if (PREDICT_FALSE
       (!tso_alloc_tx_bufs (vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size)))
     return 0;

   vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
   tso_init_buf_from_template_base (b0, sb0, default_bflags,
 				   l234_sz + first_data_size);

   u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
   if (total_src_left)
     {
       /* Need to copy more segments */
       u8 *src_ptr, *dst_ptr;
       u16 src_left, dst_left;
       /* current source buffer */
       vlib_buffer_t *csb0 = sb0;
       u32 csbi0 = sbi0;
       /* current dest buffer */
       vlib_buffer_t *cdb0;
       u16 dbi = 1;		/* the buffer [0] is b0 */

       src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
       src_left = sb0->current_length - l234_sz - first_data_size;

       tso_fixup_segmented_buf (b0, tcp_flags_no_fin_psh, is_ip6, gho);

       /* grab a second buffer and prepare the loop */
       ASSERT (dbi < vec_len (ptd->split_buffers));
       cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
       tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
 				  &dst_left, next_tcp_seq, default_bflags,
 				  gho);

       /* an arbitrary large number to catch the runaway loops */
       int nloops = 2000;
       while (total_src_left)
 	{
 	  if (nloops-- <= 0)
 	    clib_panic ("infinite loop detected");
 	  u16 bytes_to_copy = clib_min (src_left, dst_left);

 	  clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);

 	  src_left -= bytes_to_copy;
 	  src_ptr += bytes_to_copy;
 	  total_src_left -= bytes_to_copy;
 	  dst_left -= bytes_to_copy;
 	  dst_ptr += bytes_to_copy;
 	  next_tcp_seq += bytes_to_copy;
 	  cdb0->current_length += bytes_to_copy;

 	  if (0 == src_left)
 	    {
 	      int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
 	      u32 next_bi = csb0->next_buffer;

 	      /* init src to the next buffer in chain */
 	      if (has_next)
 		{
 		  csbi0 = next_bi;
 		  csb0 = vlib_get_buffer (vm, csbi0);
 		  src_left = csb0->current_length;
 		  src_ptr = vlib_buffer_get_current (csb0);
 		}
 	      else
 		{
 		  ASSERT (total_src_left == 0);
 		  break;
 		}
 	    }
 	  if (0 == dst_left && total_src_left)
 	    {
 	      n_tx_bytes += cdb0->current_length;
 	      tso_fixup_segmented_buf (cdb0, tcp_flags_no_fin_psh, is_ip6,
 				       gho);
 	      ASSERT (dbi < vec_len (ptd->split_buffers));
 	      cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
 	      tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
 					  gso_size, &dst_ptr, &dst_left,
 					  next_tcp_seq, default_bflags, gho);
 	    }
 	}

       tso_fixup_segmented_buf (cdb0, save_tcp_flags, is_ip6, gho);

       n_tx_bytes += cdb0->current_length;
     }
   n_tx_bytes += b0->current_length;
   return n_tx_bytes;
 }

 static_always_inline void
 drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
 			   vlib_node_runtime_t * node, u32 * pbi0,
 			   u32 sw_if_index, u32 drop_error_code)
 {
   u32 thread_index = vm->thread_index;

   vlib_simple_counter_main_t *cm;
   cm =
     vec_elt_at_index (vnm->interface_main.sw_if_counters,
 		      VNET_INTERFACE_COUNTER_TX_ERROR);
   vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);

   vlib_error_drop_buffers (vm, node, pbi0,
 			   /* buffer stride */ 1,
 			   /* n_buffers */ 1,
 			   VNET_INTERFACE_OUTPUT_NEXT_DROP,
 			   node->node_index, drop_error_code);
 }

 static_always_inline uword
 vnet_gso_node_inline (vlib_main_t * vm,
 		      vlib_node_runtime_t * node,
 		      vlib_frame_t * frame,
 		      vnet_main_t * vnm,
 		      vnet_hw_interface_t * hi,
 		      int is_ip6, int do_segmentation)
 {
   u32 *to_next;
   u32 next_index = node->cached_next_index;
   u32 *from = vlib_frame_vector_args (frame);
   u32 n_left_from = frame->n_vectors;
   u32 *from_end = from + n_left_from;
   u32 thread_index = vm->thread_index;
   vnet_interface_main_t *im = &vnm->interface_main;
   vnet_interface_per_thread_data_t *ptd =
     vec_elt_at_index (im->per_thread_data, thread_index);
   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;

   vlib_get_buffers (vm, from, b, n_left_from);

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

       if (!do_segmentation)
 	while (from + 8 <= from_end && n_left_to_next >= 4)
 	  {
 	    u32 bi0, bi1, bi2, bi3;
 	    u32 next0, next1, next2, next3;
 	    u32 swif0, swif1, swif2, swif3;
 	    gso_trace_t *t0, *t1, *t2, *t3;
 	    vnet_hw_interface_t *hi0, *hi1, *hi2, *hi3;

 	    /* Prefetch next iteration. */
 	    vlib_prefetch_buffer_header (b[4], LOAD);
 	    vlib_prefetch_buffer_header (b[5], LOAD);
 	    vlib_prefetch_buffer_header (b[6], LOAD);
 	    vlib_prefetch_buffer_header (b[7], LOAD);

 	    bi0 = from[0];
 	    bi1 = from[1];
 	    bi2 = from[2];
 	    bi3 = from[3];
 	    to_next[0] = bi0;
 	    to_next[1] = bi1;
 	    to_next[2] = bi2;
 	    to_next[3] = bi3;

 	    swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 	    swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 	    swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
 	    swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];

 	    if (PREDICT_FALSE (hi->sw_if_index != swif0))
 	      {
 		hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 		if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 		    (b[0]->flags & VNET_BUFFER_F_GSO))
 		  break;
 	      }
 	    if (PREDICT_FALSE (hi->sw_if_index != swif1))
 	      {
 		hi1 = vnet_get_sup_hw_interface (vnm, swif0);
 		if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 		    (b[1]->flags & VNET_BUFFER_F_GSO))
 		  break;
 	      }
 	    if (PREDICT_FALSE (hi->sw_if_index != swif2))
 	      {
 		hi2 = vnet_get_sup_hw_interface (vnm, swif0);
 		if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 		    (b[2]->flags & VNET_BUFFER_F_GSO))
 		  break;
 	      }
 	    if (PREDICT_FALSE (hi->sw_if_index != swif3))
 	      {
 		hi3 = vnet_get_sup_hw_interface (vnm, swif0);
 		if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
 		    (b[3]->flags & VNET_BUFFER_F_GSO))
 		  break;
 	      }

 	    if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 	      {
 		t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 		t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 		t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 		t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 	      }
 	    if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
 	      {
 		t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
 		t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
 		t1->gso_size = vnet_buffer2 (b[1])->gso_size;
 		t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
 	      }
 	    if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
 	      {
 		t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
 		t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
 		t2->gso_size = vnet_buffer2 (b[2])->gso_size;
 		t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
 	      }
 	    if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
 	      {
 		t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
 		t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
 		t3->gso_size = vnet_buffer2 (b[3])->gso_size;
 		t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
 	      }

 	    from += 4;
 	    to_next += 4;
 	    n_left_to_next -= 4;
 	    n_left_from -= 4;

 	    next0 = next1 = 0;
 	    next2 = next3 = 0;
 	    vnet_feature_next (&next0, b[0]);
 	    vnet_feature_next (&next1, b[1]);
 	    vnet_feature_next (&next2, b[2]);
 	    vnet_feature_next (&next3, b[3]);
 	    vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
 					     n_left_to_next, bi0, bi1, bi2,
 					     bi3, next0, next1, next2, next3);
 	    b += 4;
 	  }

       while (from + 1 <= from_end && n_left_to_next > 0)
 	{
 	  u32 bi0, swif0;
 	  gso_trace_t *t0;
 	  vnet_hw_interface_t *hi0;
 	  u32 next0 = 0;
 	  u32 do_segmentation0 = 0;

 	  swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 	  if (PREDICT_FALSE (hi->sw_if_index != swif0))
 	    {
 	      hi0 = vnet_get_sup_hw_interface (vnm, swif0);
 	      if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
 		  (b[0]->flags & VNET_BUFFER_F_GSO))
 		do_segmentation0 = 1;
 	    }
 	  else
 	    do_segmentation0 = do_segmentation;

 	  /* speculatively enqueue b0 to the current next frame */
 	  to_next[0] = bi0 = from[0];
 	  to_next += 1;
 	  n_left_to_next -= 1;
 	  from += 1;
 	  n_left_from -= 1;

 	  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
 	    {
 	      t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
 	      t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
 	      t0->gso_size = vnet_buffer2 (b[0])->gso_size;
 	      t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
 	    }

 	  if (do_segmentation0)
 	    {
 	      if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
 		{
 		  /*
 		   * Undo the enqueue of the b0 - it is not going anywhere,
 		   * and will be freed either after it's segmented or
 		   * when dropped, if there is no buffers to segment into.
 		   */
 		  to_next -= 1;
 		  n_left_to_next += 1;
 		  /* undo the counting. */
 		  gso_header_offset_t gho;
 		  u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
 		  u32 n_tx_bytes = 0;

 		  gho = vnet_gso_header_offset_parser (b[0], is_ip6);
 		  n_tx_bytes =
 		    tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
 					is_ip6);

 		  if (PREDICT_FALSE (n_tx_bytes == 0))
 		    {
 		      drop_one_buffer_and_count (vm, vnm, node, from - 1,
 						 hi->sw_if_index,
 						 VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
 		      b += 1;
 		      continue;
 		    }

 		  u16 n_tx_bufs = vec_len (ptd->split_buffers);
 		  u32 *from_seg = ptd->split_buffers;

 		  while (n_tx_bufs > 0)
 		    {
 		      u32 sbi0;
 		      vlib_buffer_t *sb0;
 		      if (n_tx_bufs >= n_left_to_next)
 			{
 			  while (n_left_to_next > 0)
 			    {
 			      sbi0 = to_next[0] = from_seg[0];
 			      sb0 = vlib_get_buffer (vm, sbi0);
 			      to_next += 1;
 			      from_seg += 1;
 			      n_left_to_next -= 1;
 			      n_tx_bufs -= 1;
 			      vnet_feature_next (&next0, sb0);
 			      vlib_validate_buffer_enqueue_x1 (vm, node,
 							       next_index,
 							       to_next,
 							       n_left_to_next,
 							       sbi0, next0);
 			    }
 			  vlib_put_next_frame (vm, node, next_index,
 					       n_left_to_next);
 			  vlib_get_new_next_frame (vm, node, next_index,
 						   to_next, n_left_to_next);
 			}
 		      while (n_tx_bufs > 0)
 			{
 			  sbi0 = to_next[0] = from_seg[0];
 			  sb0 = vlib_get_buffer (vm, sbi0);
 			  to_next += 1;
 			  from_seg += 1;
 			  n_left_to_next -= 1;
 			  n_tx_bufs -= 1;
 			  vnet_feature_next (&next0, sb0);
 			  vlib_validate_buffer_enqueue_x1 (vm, node,
 							   next_index,
 							   to_next,
 							   n_left_to_next,
 							   sbi0, next0);
 			}
 		    }
 		  /* The buffers were enqueued. Reset the length */
 		  _vec_len (ptd->split_buffers) = 0;
 		  /* Free the now segmented buffer */
 		  vlib_buffer_free_one (vm, bi0);
 		  b += 1;
 		  continue;
 		}
 	    }

 	  vnet_feature_next (&next0, b[0]);
 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 					   n_left_to_next, bi0, next0);
 	  b += 1;
 	}
       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }

   return frame->n_vectors;
 }

 static_always_inline uword
 vnet_gso_inline (vlib_main_t * vm,
 		 vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip6)
 {
   vnet_main_t *vnm = vnet_get_main ();
   vnet_hw_interface_t *hi;

   if (frame->n_vectors > 0)
     {
       u32 *from = vlib_frame_vector_args (frame);
       vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
       hi = vnet_get_sup_hw_interface (vnm,
 				      vnet_buffer (b)->sw_if_index[VLIB_TX]);

       if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
 	return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 				     is_ip6, /* do_segmentation */ 0);
       else
 	return vnet_gso_node_inline (vm, node, frame, vnm, hi,
 				     is_ip6, /* do_segmentation */ 1);
     }
   return 0;
 }

 VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 				vlib_frame_t * frame)
 {
   return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
 }

 VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 				vlib_frame_t * frame)
 {
   return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
 }

 VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 			     vlib_frame_t * frame)
 {
   return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
 }

 VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 			     vlib_frame_t * frame)
 {
   return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
 }

 /* *INDENT-OFF* */

 VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
   .vector_size = sizeof (u32),
   .format_trace = format_gso_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = 0,
   .n_next_nodes = 0,
   .name = "gso-l2-ip4",
 };

 VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
   .vector_size = sizeof (u32),
   .format_trace = format_gso_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = 0,
   .n_next_nodes = 0,
   .name = "gso-l2-ip6",
 };

 VLIB_REGISTER_NODE (gso_ip4_node) = {
   .vector_size = sizeof (u32),
   .format_trace = format_gso_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = 0,
   .n_next_nodes = 0,
   .name = "gso-ip4",
 };

 VLIB_REGISTER_NODE (gso_ip6_node) = {
   .vector_size = sizeof (u32),
   .format_trace = format_gso_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = 0,
   .n_next_nodes = 0,
   .name = "gso-ip6",
 };

 VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
   .arc_name = "l2-output-ip4",
   .node_name = "gso-l2-ip4",
   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 };

 VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
   .arc_name = "l2-output-ip6",
   .node_name = "gso-l2-ip6",
   .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
 };

 VNET_FEATURE_INIT (gso_ip4_node, static) = {
   .arc_name = "ip4-output",
   .node_name = "gso-ip4",
   .runs_after = VNET_FEATURES ("ipsec4-output-feature"),
   .runs_before = VNET_FEATURES ("interface-output"),
 };

 VNET_FEATURE_INIT (gso_ip6_node, static) = {
   .arc_name = "ip6-output",
   .node_name = "gso-ip6",
   .runs_after = VNET_FEATURES ("ipsec6-output-feature"),
   .runs_before = VNET_FEATURES ("interface-output"),
 };

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2018 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vppinfra/error.h>
	#include <vnet/ethernet/ethernet.h>
	#include <vnet/feature/feature.h>
	#include <vnet/gso/gso.h>
	#include <vnet/ip/icmp46_packet.h>
	#include <vnet/ip/ip4.h>
	#include <vnet/ip/ip6.h>
	#include <vnet/udp/udp_packet.h>

	typedef struct
	{
	u32 flags;
	u16 gso_size;
	u8 gso_l4_hdr_sz;
	} gso_trace_t;

	static u8 *
	format_gso_trace (u8 * s, va_list * args)
	{
	CLIB_UNUSED (vlib_main_t * vm) = va_arg (args, vlib_main_t );
	CLIB_UNUSED (vlib_node_t * node) = va_arg (args, vlib_node_t );
	gso_trace_t t = va_arg (args, gso_trace_t *);

	if (t->flags & VNET_BUFFER_F_GSO)
	{
	s = format (s, "gso_sz %d gso_l4_hdr_sz %d",
	t->gso_size, t->gso_l4_hdr_sz);
	}
	else
	{
	s = format (s, "non-gso buffer");
	}

	return s;
	}

	static_always_inline u16
	tso_alloc_tx_bufs (vlib_main_t * vm,
	vnet_interface_per_thread_data_t * ptd,
	vlib_buffer_t * b0, u32 n_bytes_b0, u16 l234_sz,
	u16 gso_size)
	{
	u16 size =
	clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - l234_sz);

	/* rounded-up division */
	u16 n_bufs = (n_bytes_b0 - l234_sz + (size - 1)) / size;
	u16 n_alloc;

	ASSERT (n_bufs > 0);
	vec_validate (ptd->split_buffers, n_bufs - 1);

	n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs);
	if (n_alloc < n_bufs)
	{
	vlib_buffer_free (vm, ptd->split_buffers, n_alloc);
	return 0;
	}
	return n_alloc;
	}

	static_always_inline void
	tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0,
	u32 flags, u16 length)
	{
	nb0->current_data = b0->current_data;
	nb0->total_length_not_including_first_buffer = 0;
	nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID \| flags;
	nb0->trace_handle = b0->trace_handle;
	clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque));
	clib_memcpy_fast (vlib_buffer_get_current (nb0),
	vlib_buffer_get_current (b0), length);
	nb0->current_length = length;
	}

	static_always_inline void
	tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0,
	vlib_buffer_t * b0, u16 template_data_sz,
	u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left,
	u32 next_tcp_seq, u32 flags,
	gso_header_offset_t * gho)
	{
	tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz);

	*p_dst_left =
	clib_min (gso_size,
	vlib_buffer_get_default_data_size (vm) - (template_data_sz +
	nb0->current_data));
	*p_dst_ptr = vlib_buffer_get_current (nb0) + template_data_sz;

	tcp_header_t *tcp =
	(tcp_header_t *) (vlib_buffer_get_current (nb0) + gho->l4_hdr_offset);
	tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq);
	}

	static_always_inline void
	tso_fixup_segmented_buf (vlib_buffer_t * b0, u8 tcp_flags, int is_ip6,
	gso_header_offset_t * gho)
	{
	ip4_header_t *ip4 =
	(ip4_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
	ip6_header_t *ip6 =
	(ip6_header_t *) (vlib_buffer_get_current (b0) + gho->l3_hdr_offset);
	tcp_header_t *tcp =
	(tcp_header_t *) (vlib_buffer_get_current (b0) + gho->l4_hdr_offset);

	tcp->flags = tcp_flags;

	if (is_ip6)
	ip6->payload_length =
	clib_host_to_net_u16 (b0->current_length -
	(gho->l4_hdr_offset - gho->l2_hdr_offset));
	else
	ip4->length =
	clib_host_to_net_u16 (b0->current_length -
	(gho->l3_hdr_offset - gho->l2_hdr_offset));
	}

	/**
	* Allocate the necessary number of ptd->split_buffers,
	* and segment the possibly chained buffer(s) from b0 into
	* there.
	*
	* Return the cumulative number of bytes sent or zero
	* if allocation failed.
	*/

	static_always_inline u32
	tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd,
	u32 sbi0, vlib_buffer_t * sb0, gso_header_offset_t * gho,
	u32 n_bytes_b0, int is_ip6)
	{
	u32 n_tx_bytes = 0;
	u16 gso_size = vnet_buffer2 (sb0)->gso_size;

	int l4_hdr_sz = gho->l4_hdr_sz;
	u8 save_tcp_flags = 0;
	u8 tcp_flags_no_fin_psh = 0;
	u32 next_tcp_seq = 0;

	tcp_header_t *tcp =
	(tcp_header_t *) (vlib_buffer_get_current (sb0) + gho->l4_hdr_offset);
	next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number);
	/* store original flags for last packet and reset FIN and PSH */
	save_tcp_flags = tcp->flags;
	tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN \| TCP_FLAG_PSH);
	tcp->checksum = 0;

	u32 default_bflags =
	sb0->flags & ~(VNET_BUFFER_F_GSO \| VLIB_BUFFER_NEXT_PRESENT);
	u16 l234_sz = gho->l4_hdr_offset + l4_hdr_sz - gho->l2_hdr_offset;
	int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz);
	next_tcp_seq += first_data_size;

	if (PREDICT_FALSE
	(!tso_alloc_tx_bufs (vm, ptd, sb0, n_bytes_b0, l234_sz, gso_size)))
	return 0;

	vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]);
	tso_init_buf_from_template_base (b0, sb0, default_bflags,
	l234_sz + first_data_size);

	u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size;
	if (total_src_left)
	{
	/* Need to copy more segments */
	u8 src_ptr, dst_ptr;
	u16 src_left, dst_left;
	/* current source buffer */
	vlib_buffer_t *csb0 = sb0;
	u32 csbi0 = sbi0;
	/* current dest buffer */
	vlib_buffer_t *cdb0;
	u16 dbi = 1; /* the buffer [0] is b0 */

	src_ptr = vlib_buffer_get_current (sb0) + l234_sz + first_data_size;
	src_left = sb0->current_length - l234_sz - first_data_size;

	tso_fixup_segmented_buf (b0, tcp_flags_no_fin_psh, is_ip6, gho);

	/* grab a second buffer and prepare the loop */
	ASSERT (dbi < vec_len (ptd->split_buffers));
	cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
	tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr,
	&dst_left, next_tcp_seq, default_bflags,
	gho);

	/* an arbitrary large number to catch the runaway loops */
	int nloops = 2000;
	while (total_src_left)
	{
	if (nloops-- <= 0)
	clib_panic ("infinite loop detected");
	u16 bytes_to_copy = clib_min (src_left, dst_left);

	clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy);

	src_left -= bytes_to_copy;
	src_ptr += bytes_to_copy;
	total_src_left -= bytes_to_copy;
	dst_left -= bytes_to_copy;
	dst_ptr += bytes_to_copy;
	next_tcp_seq += bytes_to_copy;
	cdb0->current_length += bytes_to_copy;

	if (0 == src_left)
	{
	int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT);
	u32 next_bi = csb0->next_buffer;

	/* init src to the next buffer in chain */
	if (has_next)
	{
	csbi0 = next_bi;
	csb0 = vlib_get_buffer (vm, csbi0);
	src_left = csb0->current_length;
	src_ptr = vlib_buffer_get_current (csb0);
	}
	else
	{
	ASSERT (total_src_left == 0);
	break;
	}
	}
	if (0 == dst_left && total_src_left)
	{
	n_tx_bytes += cdb0->current_length;
	tso_fixup_segmented_buf (cdb0, tcp_flags_no_fin_psh, is_ip6,
	gho);
	ASSERT (dbi < vec_len (ptd->split_buffers));
	cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]);
	tso_init_buf_from_template (vm, cdb0, b0, l234_sz,
	gso_size, &dst_ptr, &dst_left,
	next_tcp_seq, default_bflags, gho);
	}
	}

	tso_fixup_segmented_buf (cdb0, save_tcp_flags, is_ip6, gho);

	n_tx_bytes += cdb0->current_length;
	}
	n_tx_bytes += b0->current_length;
	return n_tx_bytes;
	}

	static_always_inline void
	drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm,
	vlib_node_runtime_t * node, u32 * pbi0,
	u32 sw_if_index, u32 drop_error_code)
	{
	u32 thread_index = vm->thread_index;

	vlib_simple_counter_main_t *cm;
	cm =
	vec_elt_at_index (vnm->interface_main.sw_if_counters,
	VNET_INTERFACE_COUNTER_TX_ERROR);
	vlib_increment_simple_counter (cm, thread_index, sw_if_index, 1);

	vlib_error_drop_buffers (vm, node, pbi0,
	/* buffer stride */ 1,
	/* n_buffers */ 1,
	VNET_INTERFACE_OUTPUT_NEXT_DROP,
	node->node_index, drop_error_code);
	}

	static_always_inline uword
	vnet_gso_node_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame,
	vnet_main_t * vnm,
	vnet_hw_interface_t * hi,
	int is_ip6, int do_segmentation)
	{
	u32 *to_next;
	u32 next_index = node->cached_next_index;
	u32 *from = vlib_frame_vector_args (frame);
	u32 n_left_from = frame->n_vectors;
	u32 *from_end = from + n_left_from;
	u32 thread_index = vm->thread_index;
	vnet_interface_main_t *im = &vnm->interface_main;
	vnet_interface_per_thread_data_t *ptd =
	vec_elt_at_index (im->per_thread_data, thread_index);
	vlib_buffer_t bufs[VLIB_FRAME_SIZE], *b = bufs;

	vlib_get_buffers (vm, from, b, n_left_from);

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

	if (!do_segmentation)
	while (from + 8 <= from_end && n_left_to_next >= 4)
	{
	u32 bi0, bi1, bi2, bi3;
	u32 next0, next1, next2, next3;
	u32 swif0, swif1, swif2, swif3;
	gso_trace_t t0, t1, t2, t3;
	vnet_hw_interface_t hi0, hi1, hi2, hi3;

	/* Prefetch next iteration. */
	vlib_prefetch_buffer_header (b[4], LOAD);
	vlib_prefetch_buffer_header (b[5], LOAD);
	vlib_prefetch_buffer_header (b[6], LOAD);
	vlib_prefetch_buffer_header (b[7], LOAD);

	bi0 = from[0];
	bi1 = from[1];
	bi2 = from[2];
	bi3 = from[3];
	to_next[0] = bi0;
	to_next[1] = bi1;
	to_next[2] = bi2;
	to_next[3] = bi3;

	swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	swif1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
	swif2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
	swif3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];

	if (PREDICT_FALSE (hi->sw_if_index != swif0))
	{
	hi0 = vnet_get_sup_hw_interface (vnm, swif0);
	if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
	(b[0]->flags & VNET_BUFFER_F_GSO))
	break;
	}
	if (PREDICT_FALSE (hi->sw_if_index != swif1))
	{
	hi1 = vnet_get_sup_hw_interface (vnm, swif0);
	if (!(hi1->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
	(b[1]->flags & VNET_BUFFER_F_GSO))
	break;
	}
	if (PREDICT_FALSE (hi->sw_if_index != swif2))
	{
	hi2 = vnet_get_sup_hw_interface (vnm, swif0);
	if ((hi2->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
	(b[2]->flags & VNET_BUFFER_F_GSO))
	break;
	}
	if (PREDICT_FALSE (hi->sw_if_index != swif3))
	{
	hi3 = vnet_get_sup_hw_interface (vnm, swif0);
	if (!(hi3->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) &&
	(b[3]->flags & VNET_BUFFER_F_GSO))
	break;
	}

	if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	{
	t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
	t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
	t0->gso_size = vnet_buffer2 (b[0])->gso_size;
	t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
	}
	if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
	{
	t1 = vlib_add_trace (vm, node, b[1], sizeof (t1[0]));
	t1->flags = b[1]->flags & VNET_BUFFER_F_GSO;
	t1->gso_size = vnet_buffer2 (b[1])->gso_size;
	t1->gso_l4_hdr_sz = vnet_buffer2 (b[1])->gso_l4_hdr_sz;
	}
	if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
	{
	t2 = vlib_add_trace (vm, node, b[2], sizeof (t2[0]));
	t2->flags = b[2]->flags & VNET_BUFFER_F_GSO;
	t2->gso_size = vnet_buffer2 (b[2])->gso_size;
	t2->gso_l4_hdr_sz = vnet_buffer2 (b[2])->gso_l4_hdr_sz;
	}
	if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
	{
	t3 = vlib_add_trace (vm, node, b[3], sizeof (t3[0]));
	t3->flags = b[3]->flags & VNET_BUFFER_F_GSO;
	t3->gso_size = vnet_buffer2 (b[3])->gso_size;
	t3->gso_l4_hdr_sz = vnet_buffer2 (b[3])->gso_l4_hdr_sz;
	}

	from += 4;
	to_next += 4;
	n_left_to_next -= 4;
	n_left_from -= 4;

	next0 = next1 = 0;
	next2 = next3 = 0;
	vnet_feature_next (&next0, b[0]);
	vnet_feature_next (&next1, b[1]);
	vnet_feature_next (&next2, b[2]);
	vnet_feature_next (&next3, b[3]);
	vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
	n_left_to_next, bi0, bi1, bi2,
	bi3, next0, next1, next2, next3);
	b += 4;
	}

	while (from + 1 <= from_end && n_left_to_next > 0)
	{
	u32 bi0, swif0;
	gso_trace_t *t0;
	vnet_hw_interface_t *hi0;
	u32 next0 = 0;
	u32 do_segmentation0 = 0;

	swif0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	if (PREDICT_FALSE (hi->sw_if_index != swif0))
	{
	hi0 = vnet_get_sup_hw_interface (vnm, swif0);
	if ((hi0->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0 &&
	(b[0]->flags & VNET_BUFFER_F_GSO))
	do_segmentation0 = 1;
	}
	else
	do_segmentation0 = do_segmentation;

	/* speculatively enqueue b0 to the current next frame */
	to_next[0] = bi0 = from[0];
	to_next += 1;
	n_left_to_next -= 1;
	from += 1;
	n_left_from -= 1;

	if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
	{
	t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
	t0->flags = b[0]->flags & VNET_BUFFER_F_GSO;
	t0->gso_size = vnet_buffer2 (b[0])->gso_size;
	t0->gso_l4_hdr_sz = vnet_buffer2 (b[0])->gso_l4_hdr_sz;
	}

	if (do_segmentation0)
	{
	if (PREDICT_FALSE (b[0]->flags & VNET_BUFFER_F_GSO))
	{
	/*
	* Undo the enqueue of the b0 - it is not going anywhere,
	* and will be freed either after it's segmented or
	* when dropped, if there is no buffers to segment into.
	*/
	to_next -= 1;
	n_left_to_next += 1;
	/* undo the counting. */
	gso_header_offset_t gho;
	u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b[0]);
	u32 n_tx_bytes = 0;

	gho = vnet_gso_header_offset_parser (b[0], is_ip6);
	n_tx_bytes =
	tso_segment_buffer (vm, ptd, bi0, b[0], &gho, n_bytes_b0,
	is_ip6);

	if (PREDICT_FALSE (n_tx_bytes == 0))
	{
	drop_one_buffer_and_count (vm, vnm, node, from - 1,
	hi->sw_if_index,
	VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO);
	b += 1;
	continue;
	}

	u16 n_tx_bufs = vec_len (ptd->split_buffers);
	u32 *from_seg = ptd->split_buffers;

	while (n_tx_bufs > 0)
	{
	u32 sbi0;
	vlib_buffer_t *sb0;
	if (n_tx_bufs >= n_left_to_next)
	{
	while (n_left_to_next > 0)
	{
	sbi0 = to_next[0] = from_seg[0];
	sb0 = vlib_get_buffer (vm, sbi0);
	to_next += 1;
	from_seg += 1;
	n_left_to_next -= 1;
	n_tx_bufs -= 1;
	vnet_feature_next (&next0, sb0);
	vlib_validate_buffer_enqueue_x1 (vm, node,
	next_index,
	to_next,
	n_left_to_next,
	sbi0, next0);
	}
	vlib_put_next_frame (vm, node, next_index,
	n_left_to_next);
	vlib_get_new_next_frame (vm, node, next_index,
	to_next, n_left_to_next);
	}
	while (n_tx_bufs > 0)
	{
	sbi0 = to_next[0] = from_seg[0];
	sb0 = vlib_get_buffer (vm, sbi0);
	to_next += 1;
	from_seg += 1;
	n_left_to_next -= 1;
	n_tx_bufs -= 1;
	vnet_feature_next (&next0, sb0);
	vlib_validate_buffer_enqueue_x1 (vm, node,
	next_index,
	to_next,
	n_left_to_next,
	sbi0, next0);
	}
	}
	/* The buffers were enqueued. Reset the length */
	_vec_len (ptd->split_buffers) = 0;
	/* Free the now segmented buffer */
	vlib_buffer_free_one (vm, bi0);
	b += 1;
	continue;
	}
	}

	vnet_feature_next (&next0, b[0]);
	vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
	n_left_to_next, bi0, next0);
	b += 1;
	}
	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}

	return frame->n_vectors;
	}

	static_always_inline uword
	vnet_gso_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip6)
	{
	vnet_main_t *vnm = vnet_get_main ();
	vnet_hw_interface_t *hi;

	if (frame->n_vectors > 0)
	{
	u32 *from = vlib_frame_vector_args (frame);
	vlib_buffer_t *b = vlib_get_buffer (vm, from[0]);
	hi = vnet_get_sup_hw_interface (vnm,
	vnet_buffer (b)->sw_if_index[VLIB_TX]);

	if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
	return vnet_gso_node_inline (vm, node, frame, vnm, hi,
	is_ip6, /* do_segmentation */ 0);
	else
	return vnet_gso_node_inline (vm, node, frame, vnm, hi,
	is_ip6, /* do_segmentation */ 1);
	}
	return 0;
	}

	VLIB_NODE_FN (gso_l2_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
	}

	VLIB_NODE_FN (gso_l2_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
	}

	VLIB_NODE_FN (gso_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return vnet_gso_inline (vm, node, frame, 0 /* ip6 */ );
	}

	VLIB_NODE_FN (gso_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return vnet_gso_inline (vm, node, frame, 1 /* ip6 */ );
	}

	/* INDENT-OFF */

	VLIB_REGISTER_NODE (gso_l2_ip4_node) = {
	.vector_size = sizeof (u32),
	.format_trace = format_gso_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = 0,
	.n_next_nodes = 0,
	.name = "gso-l2-ip4",
	};

	VLIB_REGISTER_NODE (gso_l2_ip6_node) = {
	.vector_size = sizeof (u32),
	.format_trace = format_gso_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = 0,
	.n_next_nodes = 0,
	.name = "gso-l2-ip6",
	};

	VLIB_REGISTER_NODE (gso_ip4_node) = {
	.vector_size = sizeof (u32),
	.format_trace = format_gso_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = 0,
	.n_next_nodes = 0,
	.name = "gso-ip4",
	};

	VLIB_REGISTER_NODE (gso_ip6_node) = {
	.vector_size = sizeof (u32),
	.format_trace = format_gso_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = 0,
	.n_next_nodes = 0,
	.name = "gso-ip6",
	};

	VNET_FEATURE_INIT (gso_l2_ip4_node, static) = {
	.arc_name = "l2-output-ip4",
	.node_name = "gso-l2-ip4",
	.runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
	};

	VNET_FEATURE_INIT (gso_l2_ip6_node, static) = {
	.arc_name = "l2-output-ip6",
	.node_name = "gso-l2-ip6",
	.runs_before = VNET_FEATURES ("l2-output-feat-arc-end"),
	};

	VNET_FEATURE_INIT (gso_ip4_node, static) = {
	.arc_name = "ip4-output",
	.node_name = "gso-ip4",
	.runs_after = VNET_FEATURES ("ipsec4-output-feature"),
	.runs_before = VNET_FEATURES ("interface-output"),
	};

	VNET_FEATURE_INIT (gso_ip6_node, static) = {
	.arc_name = "ip6-output",
	.node_name = "gso-ip6",
	.runs_after = VNET_FEATURES ("ipsec6-output-feature"),
	.runs_before = VNET_FEATURES ("interface-output"),
	};

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/