src/vnet/geneve/encap.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2017 SUSE LLC.
  * 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 <vppinfra/error.h>
 #include <vppinfra/hash.h>
 #include <vnet/vnet.h>
 #include <vnet/ip/ip.h>
 #include <vnet/ethernet/ethernet.h>
 #include <vnet/geneve/geneve.h>

 /* Statistics (not all errors) */
 #define foreach_geneve_encap_error    \
 _(ENCAPSULATED, "good packets encapsulated")

 static char *geneve_encap_error_strings[] = {
 #define _(sym,string) string,
   foreach_geneve_encap_error
 #undef _
 };

 typedef enum
 {
 #define _(sym,str) GENEVE_ENCAP_ERROR_##sym,
   foreach_geneve_encap_error
 #undef _
     GENEVE_ENCAP_N_ERROR,
 } geneve_encap_error_t;

 typedef enum
 {
   GENEVE_ENCAP_NEXT_DROP,
   GENEVE_ENCAP_N_NEXT,
 } geneve_encap_next_t;

 #define foreach_fixed_header4_offset            \
     _(0) _(1) _(2) _(3)

 #define foreach_fixed_header6_offset            \
     _(0) _(1) _(2) _(3) _(4) _(5) _(6)

 always_inline uword
 geneve_encap_inline (vlib_main_t * vm,
 		     vlib_node_runtime_t * node,
 		     vlib_frame_t * from_frame, u32 is_ip4)
 {
   u32 n_left_from, next_index, *from, *to_next;
   geneve_main_t *vxm = &geneve_main;
   vnet_main_t *vnm = vxm->vnet_main;
   vnet_interface_main_t *im = &vnm->interface_main;
   u32 pkts_encapsulated = 0;
   u16 old_l0 = 0, old_l1 = 0;
   u32 thread_index = vm->thread_index;
   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
   u32 sw_if_index0 = ~0, sw_if_index1 = ~0;
   u32 next0 = 0, next1 = 0;
   vnet_hw_interface_t *hi0, *hi1;
   geneve_tunnel_t *t0 = NULL, *t1 = NULL;
   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;

   from = vlib_frame_vector_args (from_frame);
   n_left_from = from_frame->n_vectors;
   vlib_get_buffers (vm, from, bufs, n_left_from);

   next_index = node->cached_next_index;
   stats_sw_if_index = node->runtime_data[0];
   stats_n_packets = stats_n_bytes = 0;

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

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

       while (n_left_from >= 4 && n_left_to_next >= 2)
 	{
 	  u32 bi0, bi1;
 	  u32 flow_hash0, flow_hash1;
 	  u32 len0, len1;
 	  ip4_header_t *ip4_0, *ip4_1;
 	  ip6_header_t *ip6_0, *ip6_1;
 	  udp_header_t *udp0, *udp1;
 	  u64 *copy_src0, *copy_dst0;
 	  u64 *copy_src1, *copy_dst1;
 	  u32 *copy_src_last0, *copy_dst_last0;
 	  u32 *copy_src_last1, *copy_dst_last1;
 	  u16 new_l0, new_l1;
 	  ip_csum_t sum0, sum1;

 	  /* Prefetch next iteration. */
 	  {
 	    vlib_prefetch_buffer_header (b[2], LOAD);
 	    vlib_prefetch_buffer_header (b[3], LOAD);

 	    CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES,
 			   2 * CLIB_CACHE_LINE_BYTES, LOAD);
 	    CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES,
 			   2 * CLIB_CACHE_LINE_BYTES, LOAD);
 	  }

 	  bi0 = from[0];
 	  bi1 = from[1];
 	  to_next[0] = bi0;
 	  to_next[1] = bi1;
 	  from += 2;
 	  to_next += 2;
 	  n_left_to_next -= 2;
 	  n_left_from -= 2;

 	  flow_hash0 = vnet_l2_compute_flow_hash (b[0]);
 	  flow_hash1 = vnet_l2_compute_flow_hash (b[1]);


 	  /* Get next node index and adj index from tunnel next_dpo */
 	  if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
 	    {
 	      sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 	      hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 	      t0 = &vxm->tunnels[hi0->dev_instance];
 	      /* Note: change to always set next0 if it may be set to drop */
 	      next0 = t0->next_dpo.dpoi_next_node;
 	    }

 	  ASSERT (t0 != NULL);

 	  vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;

 	  /* Get next node index and adj index from tunnel next_dpo */
 	  if (sw_if_index1 != vnet_buffer (b[1])->sw_if_index[VLIB_TX])
 	    {
 	      sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
 	      hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
 	      t1 = &vxm->tunnels[hi1->dev_instance];
 	      /* Note: change to always set next1 if it may be set to drop */
 	      next1 = t1->next_dpo.dpoi_next_node;
 	    }

 	  ASSERT (t1 != NULL);

 	  vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;

 	  /* Apply the rewrite string. $$$$ vnet_rewrite? */
 	  vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));
 	  vlib_buffer_advance (b[1], -(word) _vec_len (t1->rewrite));

 	  if (is_ip4)
 	    {
 	      u8 ip4_geneve_base_header_len =
 		sizeof (ip4_header_t) + sizeof (udp_header_t) +
 		GENEVE_BASE_HEADER_LENGTH;
 	      u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
 	      u8 ip4_geneve_header_total_len1 = ip4_geneve_base_header_len;
 #if SUPPORT_OPTIONS_HEADER==1
 	      ip4_geneve_header_total_len0 += t0->options_len;
 	      ip4_geneve_header_total_len1 += t1->options_len;
 #endif
 	      ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);
 	      ASSERT (vec_len (t1->rewrite) == ip4_geneve_header_total_len1);

 	      ip4_0 = vlib_buffer_get_current (b[0]);
 	      ip4_1 = vlib_buffer_get_current (b[1]);

 	      /* Copy the fixed header */
 	      copy_dst0 = (u64 *) ip4_0;
 	      copy_src0 = (u64 *) t0->rewrite;
 	      copy_dst1 = (u64 *) ip4_1;
 	      copy_src1 = (u64 *) t1->rewrite;
 	      /* Copy first 32 octets 8-bytes at a time */
 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 	      foreach_fixed_header4_offset;
 #undef _
 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 	      foreach_fixed_header4_offset;
 #undef _
 	      /* Last 4 octets. Hopefully gcc will be our friend */
 	      copy_dst_last0 = (u32 *) (&copy_dst0[4]);
 	      copy_src_last0 = (u32 *) (&copy_src0[4]);
 	      copy_dst_last0[0] = copy_src_last0[0];
 	      copy_dst_last1 = (u32 *) (&copy_dst1[4]);
 	      copy_src_last1 = (u32 *) (&copy_src1[4]);
 	      copy_dst_last1[0] = copy_src_last1[0];

 	      /* Fix the IP4 checksum and length */
 	      sum0 = ip4_0->checksum;
 	      new_l0 =		/* old_l0 always 0, see the rewrite setup */
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
 	      sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 				     length /* changed member */ );
 	      ip4_0->checksum = ip_csum_fold (sum0);
 	      ip4_0->length = new_l0;
 	      sum1 = ip4_1->checksum;
 	      new_l1 =		/* old_l1 always 0, see the rewrite setup */
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]));
 	      sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
 				     length /* changed member */ );
 	      ip4_1->checksum = ip_csum_fold (sum1);
 	      ip4_1->length = new_l1;

 	      /* Fix UDP length and set source port */
 	      udp0 = (udp_header_t *) (ip4_0 + 1);
 	      new_l0 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
 				      sizeof (*ip4_0));
 	      udp0->length = new_l0;
 	      udp0->src_port = flow_hash0;
 	      udp1 = (udp_header_t *) (ip4_1 + 1);
 	      new_l1 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]) -
 				      sizeof (*ip4_1));
 	      udp1->length = new_l1;
 	      udp1->src_port = flow_hash1;
 	    }
 	  else			/* ipv6 */
 	    {
 	      int bogus = 0;

 	      u8 ip6_geneve_base_header_len =
 		sizeof (ip6_header_t) + sizeof (udp_header_t) +
 		GENEVE_BASE_HEADER_LENGTH;
 	      u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
 	      u8 ip6_geneve_header_total_len1 = ip6_geneve_base_header_len;
 #if SUPPORT_OPTIONS_HEADER==1
 	      ip6_geneve_header_total_len0 += t0->options_len;
 	      ip6_geneve_header_total_len1 += t1->options_len;
 #endif
 	      ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);
 	      ASSERT (vec_len (t1->rewrite) == ip6_geneve_header_total_len1);

 	      ip6_0 = vlib_buffer_get_current (b[0]);
 	      ip6_1 = vlib_buffer_get_current (b[1]);

 	      /* Copy the fixed header */
 	      copy_dst0 = (u64 *) ip6_0;
 	      copy_src0 = (u64 *) t0->rewrite;
 	      copy_dst1 = (u64 *) ip6_1;
 	      copy_src1 = (u64 *) t1->rewrite;
 	      /* Copy first 56 (ip6) octets 8-bytes at a time */
 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 	      foreach_fixed_header6_offset;
 #undef _
 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 	      foreach_fixed_header6_offset;
 #undef _
 	      /* Fix IP6 payload length */
 	      new_l0 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
 				      - sizeof (*ip6_0));
 	      ip6_0->payload_length = new_l0;
 	      new_l1 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1])
 				      - sizeof (*ip6_1));
 	      ip6_1->payload_length = new_l1;

 	      /* Fix UDP length  and set source port */
 	      udp0 = (udp_header_t *) (ip6_0 + 1);
 	      udp0->length = new_l0;
 	      udp0->src_port = flow_hash0;
 	      udp1 = (udp_header_t *) (ip6_1 + 1);
 	      udp1->length = new_l1;
 	      udp1->src_port = flow_hash1;

 	      /* IPv6 UDP checksum is mandatory */
 	      udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
 								  ip6_0,
 								  &bogus);
 	      ASSERT (bogus == 0);
 	      if (udp0->checksum == 0)
 		udp0->checksum = 0xffff;
 	      udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[1],
 								  ip6_1,
 								  &bogus);
 	      ASSERT (bogus == 0);
 	      if (udp1->checksum == 0)
 		udp1->checksum = 0xffff;
 	    }

 	  pkts_encapsulated += 2;
 	  len0 = vlib_buffer_length_in_chain (vm, b[0]);
 	  len1 = vlib_buffer_length_in_chain (vm, b[1]);
 	  stats_n_packets += 2;
 	  stats_n_bytes += len0 + len1;

 	  /* save inner packet flow_hash for load-balance node */
 	  vnet_buffer (b[0])->ip.flow_hash = flow_hash0;
 	  vnet_buffer (b[1])->ip.flow_hash = flow_hash1;

 	  /* Batch stats increment on the same geneve tunnel so counter is not
 	     incremented per packet. Note stats are still incremented for deleted
 	     and admin-down tunnel where packets are dropped. It is not worthwhile
 	     to check for this rare case and affect normal path performance. */
 	  if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
 			     (sw_if_index1 != stats_sw_if_index)))
 	    {
 	      stats_n_packets -= 2;
 	      stats_n_bytes -= len0 + len1;
 	      if (sw_if_index0 == sw_if_index1)
 		{
 		  if (stats_n_packets)
 		    vlib_increment_combined_counter
 		      (im->combined_sw_if_counters +
 		       VNET_INTERFACE_COUNTER_TX, thread_index,
 		       stats_sw_if_index, stats_n_packets, stats_n_bytes);
 		  stats_sw_if_index = sw_if_index0;
 		  stats_n_packets = 2;
 		  stats_n_bytes = len0 + len1;
 		}
 	      else
 		{
 		  vlib_increment_combined_counter
 		    (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 		     thread_index, sw_if_index0, 1, len0);
 		  vlib_increment_combined_counter
 		    (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 		     thread_index, sw_if_index1, 1, len1);
 		}
 	    }

 	  if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      geneve_encap_trace_t *tr =
 		vlib_add_trace (vm, node, b[0], sizeof (*tr));
 	      tr->tunnel_index = t0 - vxm->tunnels;
 	      tr->vni = t0->vni;
 	    }

 	  if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      geneve_encap_trace_t *tr =
 		vlib_add_trace (vm, node, b[1], sizeof (*tr));
 	      tr->tunnel_index = t1 - vxm->tunnels;
 	      tr->vni = t1->vni;
 	    }
 	  b += 2;

 	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 					   to_next, n_left_to_next,
 					   bi0, bi1, next0, next1);
 	}

       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0;
 	  u32 flow_hash0;
 	  u32 len0;
 	  ip4_header_t *ip4_0;
 	  ip6_header_t *ip6_0;
 	  udp_header_t *udp0;
 	  u64 *copy_src0, *copy_dst0;
 	  u32 *copy_src_last0, *copy_dst_last0;
 	  u16 new_l0;
 	  ip_csum_t sum0;

 	  bi0 = from[0];
 	  to_next[0] = bi0;
 	  from += 1;
 	  to_next += 1;
 	  n_left_from -= 1;
 	  n_left_to_next -= 1;

 	  flow_hash0 = vnet_l2_compute_flow_hash (b[0]);

 	  /* Get next node index and adj index from tunnel next_dpo */
 	  if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
 	    {
 	      sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
 	      hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 	      t0 = &vxm->tunnels[hi0->dev_instance];
 	      /* Note: change to always set next0 if it may be set to drop */
 	      next0 = t0->next_dpo.dpoi_next_node;
 	    }
 	  vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;

 	  /* Apply the rewrite string. $$$$ vnet_rewrite? */
 	  vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));

 	  if (is_ip4)
 	    {
 	      u8 ip4_geneve_base_header_len =
 		sizeof (ip4_header_t) + sizeof (udp_header_t) +
 		GENEVE_BASE_HEADER_LENGTH;
 	      u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
 #if SUPPORT_OPTIONS_HEADER==1
 	      ip4_geneve_header_total_len0 += t0->options_len;
 #endif
 	      ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);

 	      ip4_0 = vlib_buffer_get_current (b[0]);

 	      /* Copy the fixed header */
 	      copy_dst0 = (u64 *) ip4_0;
 	      copy_src0 = (u64 *) t0->rewrite;
 	      /* Copy first 32 octets 8-bytes at a time */
 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 	      foreach_fixed_header4_offset;
 #undef _
 	      /* Last 4 octets. Hopefully gcc will be our friend */
 	      copy_dst_last0 = (u32 *) (&copy_dst0[4]);
 	      copy_src_last0 = (u32 *) (&copy_src0[4]);
 	      copy_dst_last0[0] = copy_src_last0[0];

 	      /* Fix the IP4 checksum and length */
 	      sum0 = ip4_0->checksum;
 	      new_l0 =		/* old_l0 always 0, see the rewrite setup */
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
 	      sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 				     length /* changed member */ );
 	      ip4_0->checksum = ip_csum_fold (sum0);
 	      ip4_0->length = new_l0;

 	      /* Fix UDP length and set source port */
 	      udp0 = (udp_header_t *) (ip4_0 + 1);
 	      new_l0 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
 				      sizeof (*ip4_0));
 	      udp0->length = new_l0;
 	      udp0->src_port = flow_hash0;
 	    }

 	  else			/* ip6 path */
 	    {
 	      int bogus = 0;

 	      u8 ip6_geneve_base_header_len =
 		sizeof (ip6_header_t) + sizeof (udp_header_t) +
 		GENEVE_BASE_HEADER_LENGTH;
 	      u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
 #if SUPPORT_OPTIONS_HEADER==1
 	      ip6_geneve_header_total_len0 += t0->options_len;
 #endif
 	      ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);

 	      ip6_0 = vlib_buffer_get_current (b[0]);
 	      /* Copy the fixed header */
 	      copy_dst0 = (u64 *) ip6_0;
 	      copy_src0 = (u64 *) t0->rewrite;
 	      /* Copy first 56 (ip6) octets 8-bytes at a time */
 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 	      foreach_fixed_header6_offset;
 #undef _
 	      /* Fix IP6 payload length */
 	      new_l0 =
 		clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
 				      - sizeof (*ip6_0));
 	      ip6_0->payload_length = new_l0;

 	      /* Fix UDP length  and set source port */
 	      udp0 = (udp_header_t *) (ip6_0 + 1);
 	      udp0->length = new_l0;
 	      udp0->src_port = flow_hash0;

 	      /* IPv6 UDP checksum is mandatory */
 	      udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
 								  ip6_0,
 								  &bogus);
 	      ASSERT (bogus == 0);
 	      if (udp0->checksum == 0)
 		udp0->checksum = 0xffff;
 	    }

 	  pkts_encapsulated++;
 	  len0 = vlib_buffer_length_in_chain (vm, b[0]);
 	  stats_n_packets += 1;
 	  stats_n_bytes += len0;

 	  /* save inner packet flow_hash for load-balance node */
 	  vnet_buffer (b[0])->ip.flow_hash = flow_hash0;

 	  /* Batch stats increment on the same geneve tunnel so counter is not
 	     incremented per packet. Note stats are still incremented for deleted
 	     and admin-down tunnel where packets are dropped. It is not worthwhile
 	     to check for this rare case and affect normal path performance. */
 	  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 	    {
 	      stats_n_packets -= 1;
 	      stats_n_bytes -= len0;
 	      if (stats_n_packets)
 		vlib_increment_combined_counter
 		  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 		   thread_index, stats_sw_if_index,
 		   stats_n_packets, stats_n_bytes);
 	      stats_n_packets = 1;
 	      stats_n_bytes = len0;
 	      stats_sw_if_index = sw_if_index0;
 	    }

 	  if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      geneve_encap_trace_t *tr =
 		vlib_add_trace (vm, node, b[0], sizeof (*tr));
 	      tr->tunnel_index = t0 - vxm->tunnels;
 	      tr->vni = t0->vni;
 	    }
 	  b += 1;

 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 					   to_next, n_left_to_next,
 					   bi0, next0);
 	}

       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }

   /* Do we still need this now that tunnel tx stats is kept? */
   vlib_node_increment_counter (vm, node->node_index,
 			       GENEVE_ENCAP_ERROR_ENCAPSULATED,
 			       pkts_encapsulated);

   /* Increment any remaining batch stats */
   if (stats_n_packets)
     {
       vlib_increment_combined_counter
 	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 	 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
       node->runtime_data[0] = stats_sw_if_index;
     }

   return from_frame->n_vectors;
 }

 VLIB_NODE_FN (geneve4_encap_node) (vlib_main_t * vm,
 				   vlib_node_runtime_t * node,
 				   vlib_frame_t * from_frame)
 {
   return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
 }

 VLIB_NODE_FN (geneve6_encap_node) (vlib_main_t * vm,
 				   vlib_node_runtime_t * node,
 				   vlib_frame_t * from_frame)
 {
   return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (geneve4_encap_node) = {
   .name = "geneve4-encap",
   .vector_size = sizeof (u32),
   .format_trace = format_geneve_encap_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = ARRAY_LEN (geneve_encap_error_strings),
   .error_strings = geneve_encap_error_strings,
   .n_next_nodes = GENEVE_ENCAP_N_NEXT,
   .next_nodes = {
         [GENEVE_ENCAP_NEXT_DROP] = "error-drop",
   },
 };

 VLIB_REGISTER_NODE (geneve6_encap_node) = {
   .name = "geneve6-encap",
   .vector_size = sizeof (u32),
   .format_trace = format_geneve_encap_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
   .n_errors = ARRAY_LEN (geneve_encap_error_strings),
   .error_strings = geneve_encap_error_strings,
   .n_next_nodes = GENEVE_ENCAP_N_NEXT,
   .next_nodes = {
         [GENEVE_ENCAP_NEXT_DROP] = "error-drop",
   },
 };
 /* *INDENT-ON* */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2017 SUSE LLC.
	* 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 <vppinfra/error.h>
	#include <vppinfra/hash.h>
	#include <vnet/vnet.h>
	#include <vnet/ip/ip.h>
	#include <vnet/ethernet/ethernet.h>
	#include <vnet/geneve/geneve.h>

	/* Statistics (not all errors) */
	#define foreach_geneve_encap_error \
	_(ENCAPSULATED, "good packets encapsulated")

	static char *geneve_encap_error_strings[] = {
	#define _(sym,string) string,
	foreach_geneve_encap_error
	#undef _
	};

	typedef enum
	{
	#define _(sym,str) GENEVE_ENCAP_ERROR_##sym,
	foreach_geneve_encap_error
	#undef _
	GENEVE_ENCAP_N_ERROR,
	} geneve_encap_error_t;

	typedef enum
	{
	GENEVE_ENCAP_NEXT_DROP,
	GENEVE_ENCAP_N_NEXT,
	} geneve_encap_next_t;

	#define foreach_fixed_header4_offset \
	_(0) _(1) _(2) _(3)

	#define foreach_fixed_header6_offset \
	_(0) _(1) _(2) _(3) _(4) _(5) _(6)

	always_inline uword
	geneve_encap_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame, u32 is_ip4)
	{
	u32 n_left_from, next_index, from, to_next;
	geneve_main_t *vxm = &geneve_main;
	vnet_main_t *vnm = vxm->vnet_main;
	vnet_interface_main_t *im = &vnm->interface_main;
	u32 pkts_encapsulated = 0;
	u16 old_l0 = 0, old_l1 = 0;
	u32 thread_index = vm->thread_index;
	u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
	u32 sw_if_index0 = ~0, sw_if_index1 = ~0;
	u32 next0 = 0, next1 = 0;
	vnet_hw_interface_t hi0, hi1;
	geneve_tunnel_t t0 = NULL, t1 = NULL;
	vlib_buffer_t bufs[VLIB_FRAME_SIZE], *b = bufs;

	from = vlib_frame_vector_args (from_frame);
	n_left_from = from_frame->n_vectors;
	vlib_get_buffers (vm, from, bufs, n_left_from);

	next_index = node->cached_next_index;
	stats_sw_if_index = node->runtime_data[0];
	stats_n_packets = stats_n_bytes = 0;

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

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

	while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	u32 bi0, bi1;
	u32 flow_hash0, flow_hash1;
	u32 len0, len1;
	ip4_header_t ip4_0, ip4_1;
	ip6_header_t ip6_0, ip6_1;
	udp_header_t udp0, udp1;
	u64 copy_src0, copy_dst0;
	u64 copy_src1, copy_dst1;
	u32 copy_src_last0, copy_dst_last0;
	u32 copy_src_last1, copy_dst_last1;
	u16 new_l0, new_l1;
	ip_csum_t sum0, sum1;

	/* Prefetch next iteration. */
	{
	vlib_prefetch_buffer_header (b[2], LOAD);
	vlib_prefetch_buffer_header (b[3], LOAD);

	CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES,
	2 * CLIB_CACHE_LINE_BYTES, LOAD);
	CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES,
	2 * CLIB_CACHE_LINE_BYTES, LOAD);
	}

	bi0 = from[0];
	bi1 = from[1];
	to_next[0] = bi0;
	to_next[1] = bi1;
	from += 2;
	to_next += 2;
	n_left_to_next -= 2;
	n_left_from -= 2;

	flow_hash0 = vnet_l2_compute_flow_hash (b[0]);
	flow_hash1 = vnet_l2_compute_flow_hash (b[1]);


	/* Get next node index and adj index from tunnel next_dpo */
	if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
	{
	sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
	t0 = &vxm->tunnels[hi0->dev_instance];
	/* Note: change to always set next0 if it may be set to drop */
	next0 = t0->next_dpo.dpoi_next_node;
	}

	ASSERT (t0 != NULL);

	vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;

	/* Get next node index and adj index from tunnel next_dpo */
	if (sw_if_index1 != vnet_buffer (b[1])->sw_if_index[VLIB_TX])
	{
	sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
	hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
	t1 = &vxm->tunnels[hi1->dev_instance];
	/* Note: change to always set next1 if it may be set to drop */
	next1 = t1->next_dpo.dpoi_next_node;
	}

	ASSERT (t1 != NULL);

	vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;

	/* Apply the rewrite string. $$$$ vnet_rewrite? */
	vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));
	vlib_buffer_advance (b[1], -(word) _vec_len (t1->rewrite));

	if (is_ip4)
	{
	u8 ip4_geneve_base_header_len =
	sizeof (ip4_header_t) + sizeof (udp_header_t) +
	GENEVE_BASE_HEADER_LENGTH;
	u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
	u8 ip4_geneve_header_total_len1 = ip4_geneve_base_header_len;
	#if SUPPORT_OPTIONS_HEADER==1
	ip4_geneve_header_total_len0 += t0->options_len;
	ip4_geneve_header_total_len1 += t1->options_len;
	#endif
	ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);
	ASSERT (vec_len (t1->rewrite) == ip4_geneve_header_total_len1);

	ip4_0 = vlib_buffer_get_current (b[0]);
	ip4_1 = vlib_buffer_get_current (b[1]);

	/* Copy the fixed header */
	copy_dst0 = (u64 *) ip4_0;
	copy_src0 = (u64 *) t0->rewrite;
	copy_dst1 = (u64 *) ip4_1;
	copy_src1 = (u64 *) t1->rewrite;
	/* Copy first 32 octets 8-bytes at a time */
	#define _(offs) copy_dst0[offs] = copy_src0[offs];
	foreach_fixed_header4_offset;
	#undef _
	#define _(offs) copy_dst1[offs] = copy_src1[offs];
	foreach_fixed_header4_offset;
	#undef _
	/* Last 4 octets. Hopefully gcc will be our friend */
	copy_dst_last0 = (u32 *) (&copy_dst0[4]);
	copy_src_last0 = (u32 *) (&copy_src0[4]);
	copy_dst_last0[0] = copy_src_last0[0];
	copy_dst_last1 = (u32 *) (&copy_dst1[4]);
	copy_src_last1 = (u32 *) (&copy_src1[4]);
	copy_dst_last1[0] = copy_src_last1[0];

	/* Fix the IP4 checksum and length */
	sum0 = ip4_0->checksum;
	new_l0 = /* old_l0 always 0, see the rewrite setup */
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
	sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
	length /* changed member */ );
	ip4_0->checksum = ip_csum_fold (sum0);
	ip4_0->length = new_l0;
	sum1 = ip4_1->checksum;
	new_l1 = /* old_l1 always 0, see the rewrite setup */
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]));
	sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
	length /* changed member */ );
	ip4_1->checksum = ip_csum_fold (sum1);
	ip4_1->length = new_l1;

	/* Fix UDP length and set source port */
	udp0 = (udp_header_t *) (ip4_0 + 1);
	new_l0 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
	sizeof (*ip4_0));
	udp0->length = new_l0;
	udp0->src_port = flow_hash0;
	udp1 = (udp_header_t *) (ip4_1 + 1);
	new_l1 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1]) -
	sizeof (*ip4_1));
	udp1->length = new_l1;
	udp1->src_port = flow_hash1;
	}
	else /* ipv6 */
	{
	int bogus = 0;

	u8 ip6_geneve_base_header_len =
	sizeof (ip6_header_t) + sizeof (udp_header_t) +
	GENEVE_BASE_HEADER_LENGTH;
	u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
	u8 ip6_geneve_header_total_len1 = ip6_geneve_base_header_len;
	#if SUPPORT_OPTIONS_HEADER==1
	ip6_geneve_header_total_len0 += t0->options_len;
	ip6_geneve_header_total_len1 += t1->options_len;
	#endif
	ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);
	ASSERT (vec_len (t1->rewrite) == ip6_geneve_header_total_len1);

	ip6_0 = vlib_buffer_get_current (b[0]);
	ip6_1 = vlib_buffer_get_current (b[1]);

	/* Copy the fixed header */
	copy_dst0 = (u64 *) ip6_0;
	copy_src0 = (u64 *) t0->rewrite;
	copy_dst1 = (u64 *) ip6_1;
	copy_src1 = (u64 *) t1->rewrite;
	/* Copy first 56 (ip6) octets 8-bytes at a time */
	#define _(offs) copy_dst0[offs] = copy_src0[offs];
	foreach_fixed_header6_offset;
	#undef _
	#define _(offs) copy_dst1[offs] = copy_src1[offs];
	foreach_fixed_header6_offset;
	#undef _
	/* Fix IP6 payload length */
	new_l0 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
	- sizeof (*ip6_0));
	ip6_0->payload_length = new_l0;
	new_l1 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[1])
	- sizeof (*ip6_1));
	ip6_1->payload_length = new_l1;

	/* Fix UDP length and set source port */
	udp0 = (udp_header_t *) (ip6_0 + 1);
	udp0->length = new_l0;
	udp0->src_port = flow_hash0;
	udp1 = (udp_header_t *) (ip6_1 + 1);
	udp1->length = new_l1;
	udp1->src_port = flow_hash1;

	/* IPv6 UDP checksum is mandatory */
	udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
	ip6_0,
	&bogus);
	ASSERT (bogus == 0);
	if (udp0->checksum == 0)
	udp0->checksum = 0xffff;
	udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[1],
	ip6_1,
	&bogus);
	ASSERT (bogus == 0);
	if (udp1->checksum == 0)
	udp1->checksum = 0xffff;
	}

	pkts_encapsulated += 2;
	len0 = vlib_buffer_length_in_chain (vm, b[0]);
	len1 = vlib_buffer_length_in_chain (vm, b[1]);
	stats_n_packets += 2;
	stats_n_bytes += len0 + len1;

	/* save inner packet flow_hash for load-balance node */
	vnet_buffer (b[0])->ip.flow_hash = flow_hash0;
	vnet_buffer (b[1])->ip.flow_hash = flow_hash1;

	/* Batch stats increment on the same geneve tunnel so counter is not
	incremented per packet. Note stats are still incremented for deleted
	and admin-down tunnel where packets are dropped. It is not worthwhile
	to check for this rare case and affect normal path performance. */
	if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) \|\|
	(sw_if_index1 != stats_sw_if_index)))
	{
	stats_n_packets -= 2;
	stats_n_bytes -= len0 + len1;
	if (sw_if_index0 == sw_if_index1)
	{
	if (stats_n_packets)
	vlib_increment_combined_counter
	(im->combined_sw_if_counters +
	VNET_INTERFACE_COUNTER_TX, thread_index,
	stats_sw_if_index, stats_n_packets, stats_n_bytes);
	stats_sw_if_index = sw_if_index0;
	stats_n_packets = 2;
	stats_n_bytes = len0 + len1;
	}
	else
	{
	vlib_increment_combined_counter
	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, sw_if_index0, 1, len0);
	vlib_increment_combined_counter
	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, sw_if_index1, 1, len1);
	}
	}

	if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
	{
	geneve_encap_trace_t *tr =
	vlib_add_trace (vm, node, b[0], sizeof (*tr));
	tr->tunnel_index = t0 - vxm->tunnels;
	tr->vni = t0->vni;
	}

	if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
	{
	geneve_encap_trace_t *tr =
	vlib_add_trace (vm, node, b[1], sizeof (*tr));
	tr->tunnel_index = t1 - vxm->tunnels;
	tr->vni = t1->vni;
	}
	b += 2;

	vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, bi1, next0, next1);
	}

	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	u32 flow_hash0;
	u32 len0;
	ip4_header_t *ip4_0;
	ip6_header_t *ip6_0;
	udp_header_t *udp0;
	u64 copy_src0, copy_dst0;
	u32 copy_src_last0, copy_dst_last0;
	u16 new_l0;
	ip_csum_t sum0;

	bi0 = from[0];
	to_next[0] = bi0;
	from += 1;
	to_next += 1;
	n_left_from -= 1;
	n_left_to_next -= 1;

	flow_hash0 = vnet_l2_compute_flow_hash (b[0]);

	/* Get next node index and adj index from tunnel next_dpo */
	if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
	{
	sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
	t0 = &vxm->tunnels[hi0->dev_instance];
	/* Note: change to always set next0 if it may be set to drop */
	next0 = t0->next_dpo.dpoi_next_node;
	}
	vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;

	/* Apply the rewrite string. $$$$ vnet_rewrite? */
	vlib_buffer_advance (b[0], -(word) _vec_len (t0->rewrite));

	if (is_ip4)
	{
	u8 ip4_geneve_base_header_len =
	sizeof (ip4_header_t) + sizeof (udp_header_t) +
	GENEVE_BASE_HEADER_LENGTH;
	u8 ip4_geneve_header_total_len0 = ip4_geneve_base_header_len;
	#if SUPPORT_OPTIONS_HEADER==1
	ip4_geneve_header_total_len0 += t0->options_len;
	#endif
	ASSERT (vec_len (t0->rewrite) == ip4_geneve_header_total_len0);

	ip4_0 = vlib_buffer_get_current (b[0]);

	/* Copy the fixed header */
	copy_dst0 = (u64 *) ip4_0;
	copy_src0 = (u64 *) t0->rewrite;
	/* Copy first 32 octets 8-bytes at a time */
	#define _(offs) copy_dst0[offs] = copy_src0[offs];
	foreach_fixed_header4_offset;
	#undef _
	/* Last 4 octets. Hopefully gcc will be our friend */
	copy_dst_last0 = (u32 *) (&copy_dst0[4]);
	copy_src_last0 = (u32 *) (&copy_src0[4]);
	copy_dst_last0[0] = copy_src_last0[0];

	/* Fix the IP4 checksum and length */
	sum0 = ip4_0->checksum;
	new_l0 = /* old_l0 always 0, see the rewrite setup */
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]));
	sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
	length /* changed member */ );
	ip4_0->checksum = ip_csum_fold (sum0);
	ip4_0->length = new_l0;

	/* Fix UDP length and set source port */
	udp0 = (udp_header_t *) (ip4_0 + 1);
	new_l0 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) -
	sizeof (*ip4_0));
	udp0->length = new_l0;
	udp0->src_port = flow_hash0;
	}

	else /* ip6 path */
	{
	int bogus = 0;

	u8 ip6_geneve_base_header_len =
	sizeof (ip6_header_t) + sizeof (udp_header_t) +
	GENEVE_BASE_HEADER_LENGTH;
	u8 ip6_geneve_header_total_len0 = ip6_geneve_base_header_len;
	#if SUPPORT_OPTIONS_HEADER==1
	ip6_geneve_header_total_len0 += t0->options_len;
	#endif
	ASSERT (vec_len (t0->rewrite) == ip6_geneve_header_total_len0);

	ip6_0 = vlib_buffer_get_current (b[0]);
	/* Copy the fixed header */
	copy_dst0 = (u64 *) ip6_0;
	copy_src0 = (u64 *) t0->rewrite;
	/* Copy first 56 (ip6) octets 8-bytes at a time */
	#define _(offs) copy_dst0[offs] = copy_src0[offs];
	foreach_fixed_header6_offset;
	#undef _
	/* Fix IP6 payload length */
	new_l0 =
	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])
	- sizeof (*ip6_0));
	ip6_0->payload_length = new_l0;

	/* Fix UDP length and set source port */
	udp0 = (udp_header_t *) (ip6_0 + 1);
	udp0->length = new_l0;
	udp0->src_port = flow_hash0;

	/* IPv6 UDP checksum is mandatory */
	udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b[0],
	ip6_0,
	&bogus);
	ASSERT (bogus == 0);
	if (udp0->checksum == 0)
	udp0->checksum = 0xffff;
	}

	pkts_encapsulated++;
	len0 = vlib_buffer_length_in_chain (vm, b[0]);
	stats_n_packets += 1;
	stats_n_bytes += len0;

	/* save inner packet flow_hash for load-balance node */
	vnet_buffer (b[0])->ip.flow_hash = flow_hash0;

	/* Batch stats increment on the same geneve tunnel so counter is not
	incremented per packet. Note stats are still incremented for deleted
	and admin-down tunnel where packets are dropped. It is not worthwhile
	to check for this rare case and affect normal path performance. */
	if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
	{
	stats_n_packets -= 1;
	stats_n_bytes -= len0;
	if (stats_n_packets)
	vlib_increment_combined_counter
	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, stats_sw_if_index,
	stats_n_packets, stats_n_bytes);
	stats_n_packets = 1;
	stats_n_bytes = len0;
	stats_sw_if_index = sw_if_index0;
	}

	if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
	{
	geneve_encap_trace_t *tr =
	vlib_add_trace (vm, node, b[0], sizeof (*tr));
	tr->tunnel_index = t0 - vxm->tunnels;
	tr->vni = t0->vni;
	}
	b += 1;

	vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, next0);
	}

	vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	}

	/* Do we still need this now that tunnel tx stats is kept? */
	vlib_node_increment_counter (vm, node->node_index,
	GENEVE_ENCAP_ERROR_ENCAPSULATED,
	pkts_encapsulated);

	/* Increment any remaining batch stats */
	if (stats_n_packets)
	{
	vlib_increment_combined_counter
	(im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
	thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
	node->runtime_data[0] = stats_sw_if_index;
	}

	return from_frame->n_vectors;
	}

	VLIB_NODE_FN (geneve4_encap_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
	}

	VLIB_NODE_FN (geneve6_encap_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * from_frame)
	{
	return geneve_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (geneve4_encap_node) = {
	.name = "geneve4-encap",
	.vector_size = sizeof (u32),
	.format_trace = format_geneve_encap_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = ARRAY_LEN (geneve_encap_error_strings),
	.error_strings = geneve_encap_error_strings,
	.n_next_nodes = GENEVE_ENCAP_N_NEXT,
	.next_nodes = {
	[GENEVE_ENCAP_NEXT_DROP] = "error-drop",
	},
	};

	VLIB_REGISTER_NODE (geneve6_encap_node) = {
	.name = "geneve6-encap",
	.vector_size = sizeof (u32),
	.format_trace = format_geneve_encap_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,
	.n_errors = ARRAY_LEN (geneve_encap_error_strings),
	.error_strings = geneve_encap_error_strings,
	.n_next_nodes = GENEVE_ENCAP_N_NEXT,
	.next_nodes = {
	[GENEVE_ENCAP_NEXT_DROP] = "error-drop",
	},
	};
	/* INDENT-ON */

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