FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
nsh_output.c
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1 /*
2  * nsh_output.c: NSH Adj rewrite
3  *
4  * Copyright (c) 2017-2019 Intel and/or its affiliates.
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/ip/ip.h>
21 #include <nsh/nsh.h>
22 
23 typedef struct {
24  /* Adjacency taken. */
27 
28  /* Packet data, possibly *after* rewrite. */
29  u8 packet_data[64 - 1*sizeof(u32)];
31 
32 #define foreach_nsh_output_next \
33 _(DROP, "error-drop") \
34 _(INTERFACE, "interface-output" )
35 
36 typedef enum {
37 #define _(s,n) NSH_OUTPUT_NEXT_##s,
39 #undef _
42 
43 static u8 *
44 format_nsh_output_trace (u8 * s, va_list * args)
45 {
46  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
47  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
48  nsh_output_trace_t * t = va_arg (*args, nsh_output_trace_t *);
49  uword indent = format_get_indent (s);
50 
51  s = format (s, "adj-idx %d : %U flow hash: 0x%08x",
52  t->adj_index,
54  t->flow_hash);
55  s = format (s, "\n%U%U",
56  format_white_space, indent,
58  t->adj_index, t->packet_data, sizeof (t->packet_data));
59  return s;
60 }
61 
62 static inline uword
64  vlib_node_runtime_t * node,
65  vlib_frame_t * from_frame,
66  int is_midchain)
67 {
68  u32 n_left_from, next_index, * from, * to_next, thread_index;
69  vlib_node_runtime_t * error_node;
70  u32 n_left_to_next;
71  nsh_main_t *nm;
72 
73  thread_index = vlib_get_thread_index();
74  error_node = vlib_node_get_runtime (vm, nsh_eth_output_node.index);
75  from = vlib_frame_vector_args (from_frame);
76  n_left_from = from_frame->n_vectors;
77  next_index = node->cached_next_index;
78  nm = &nsh_main;
79 
80  while (n_left_from > 0)
81  {
82  vlib_get_next_frame (vm, node, next_index,
83  to_next, n_left_to_next);
84 
85  while (n_left_from >= 4 && n_left_to_next >= 2)
86  {
87  ip_adjacency_t * adj0;
88  nsh_base_header_t *hdr0;
89  ethernet_header_t * eth_hdr0;
90  vlib_buffer_t * p0;
91  u32 pi0, rw_len0, adj_index0, next0, error0;
92 
93  ip_adjacency_t * adj1;
94  nsh_base_header_t *hdr1;
95  ethernet_header_t * eth_hdr1;
96  vlib_buffer_t * p1;
97  u32 pi1, rw_len1, adj_index1, next1, error1;
98 
99  /* Prefetch next iteration. */
100  {
101  vlib_buffer_t * p2, * p3;
102 
103  p2 = vlib_get_buffer (vm, from[2]);
104  p3 = vlib_get_buffer (vm, from[3]);
105 
106  vlib_prefetch_buffer_header (p2, STORE);
107  vlib_prefetch_buffer_header (p3, STORE);
108 
109  CLIB_PREFETCH (p2->data, sizeof (hdr0[0]), STORE);
110  CLIB_PREFETCH (p3->data, sizeof (hdr1[0]), STORE);
111  }
112 
113  pi0 = to_next[0] = from[0];
114  pi1 = to_next[1] = from[1];
115 
116  from += 2;
117  n_left_from -= 2;
118  to_next += 2;
119  n_left_to_next -= 2;
120 
121  p0 = vlib_get_buffer (vm, pi0);
122  p1 = vlib_get_buffer (vm, pi1);
123 
124  adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
125  adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
126 
127  adj0 = adj_get(adj_index0);
128  adj1 = adj_get(adj_index1);
129  hdr0 = vlib_buffer_get_current (p0);
130  hdr1 = vlib_buffer_get_current (p1);
131 
132  /* Guess we are only writing on simple Ethernet header. */
133  vnet_rewrite_two_headers (adj0[0], adj1[0], hdr0, hdr1,
134  sizeof (ethernet_header_t));
135 
136  eth_hdr0 = (ethernet_header_t*)((u8 *)hdr0-sizeof(ethernet_header_t));
137  eth_hdr0->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
138  eth_hdr1 = (ethernet_header_t*)((u8 *)hdr1-sizeof(ethernet_header_t));
139  eth_hdr1->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
140 
141  /* Update packet buffer attributes/set output interface. */
142  rw_len0 = adj0[0].rewrite_header.data_bytes;
143  rw_len1 = adj1[0].rewrite_header.data_bytes;
144 
145  /* Bump the adj counters for packet and bytes */
148  thread_index,
149  adj_index0,
150  1,
151  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
154  thread_index,
155  adj_index1,
156  1,
157  vlib_buffer_length_in_chain (vm, p1) + rw_len1);
158 
159  /* Check MTU of outgoing interface. */
161  adj0[0].rewrite_header.max_l3_packet_bytes))
162  {
163  p0->current_data -= rw_len0;
164  p0->current_length += rw_len0;
165 
166  vnet_buffer (p0)->sw_if_index[VLIB_TX] =
167  adj0[0].rewrite_header.sw_if_index;
168  next0 = NSH_OUTPUT_NEXT_INTERFACE;
169  error0 = IP4_ERROR_NONE;
170 
171  if (PREDICT_FALSE(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
173  adj0[0].rewrite_header.sw_if_index,
174  &next0, p0);
175  }
176  else
177  {
178  error0 = IP4_ERROR_MTU_EXCEEDED;
179  next0 = NSH_OUTPUT_NEXT_DROP;
180  }
182  adj1[0].rewrite_header.max_l3_packet_bytes))
183  {
184  p1->current_data -= rw_len1;
185  p1->current_length += rw_len1;
186 
187  vnet_buffer (p1)->sw_if_index[VLIB_TX] =
188  adj1[0].rewrite_header.sw_if_index;
189  next1 = NSH_OUTPUT_NEXT_INTERFACE;
190  error1 = IP4_ERROR_NONE;
191 
192  if (PREDICT_FALSE(adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
194  adj1[0].rewrite_header.sw_if_index,
195  &next1, p1);
196  }
197  else
198  {
199  error1 = IP4_ERROR_MTU_EXCEEDED;
200  next1 = NSH_OUTPUT_NEXT_DROP;
201  }
202  if (is_midchain)
203  {
204  adj0->sub_type.midchain.fixup_func
205  (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
206  adj1->sub_type.midchain.fixup_func
207  (vm, adj1, p1, adj1->sub_type.midchain.fixup_data);
208  }
209 
210  p0->error = error_node->errors[error0];
211  p1->error = error_node->errors[error1];
212 
213  if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
214  {
215  nsh_output_trace_t *tr = vlib_add_trace (vm, node,
216  p0, sizeof (*tr));
217  tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
218  tr->flow_hash = vnet_buffer(p0)->ip.flow_hash;
219  }
220  if (PREDICT_FALSE(p1->flags & VLIB_BUFFER_IS_TRACED))
221  {
222  nsh_output_trace_t *tr = vlib_add_trace (vm, node,
223  p1, sizeof (*tr));
224  tr->adj_index = vnet_buffer(p1)->ip.adj_index[VLIB_TX];
225  tr->flow_hash = vnet_buffer(p1)->ip.flow_hash;
226  }
227 
228  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
229  to_next, n_left_to_next,
230  pi0, pi1, next0, next1);
231  }
232 
233  while (n_left_from > 0 && n_left_to_next > 0)
234  {
235  ip_adjacency_t * adj0;
236  nsh_base_header_t *hdr0;
237  ethernet_header_t * eth_hdr0;
238  vlib_buffer_t * p0;
239  u32 pi0, rw_len0, adj_index0, next0, error0;
240 
241  pi0 = to_next[0] = from[0];
242 
243  p0 = vlib_get_buffer (vm, pi0);
244 
245  adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
246 
247  adj0 = adj_get(adj_index0);
248  hdr0 = vlib_buffer_get_current (p0);
249 
250  /* Guess we are only writing on simple Ethernet header. */
251  vnet_rewrite_one_header (adj0[0], hdr0,
252  sizeof (ethernet_header_t));
253 
254  eth_hdr0 = (ethernet_header_t*)((u8 *)hdr0-sizeof(ethernet_header_t));
255  eth_hdr0->type = clib_host_to_net_u16(ETHERNET_TYPE_NSH);
256 
257  /* Update packet buffer attributes/set output interface. */
258  rw_len0 = adj0[0].rewrite_header.data_bytes;
259 
262  thread_index,
263  adj_index0,
264  1,
265  vlib_buffer_length_in_chain (vm, p0) + rw_len0);
266 
267  /* Check MTU of outgoing interface. */
269  adj0[0].rewrite_header.max_l3_packet_bytes))
270  {
271  p0->current_data -= rw_len0;
272  p0->current_length += rw_len0;
273 
274  vnet_buffer (p0)->sw_if_index[VLIB_TX] =
275  adj0[0].rewrite_header.sw_if_index;
276  next0 = NSH_OUTPUT_NEXT_INTERFACE;
277  error0 = IP4_ERROR_NONE;
278 
279  if (PREDICT_FALSE(adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
281  adj0[0].rewrite_header.sw_if_index,
282  &next0, p0);
283  }
284  else
285  {
286  error0 = IP4_ERROR_MTU_EXCEEDED;
287  next0 = NSH_OUTPUT_NEXT_DROP;
288  }
289  if (is_midchain)
290  {
291  adj0->sub_type.midchain.fixup_func
292  (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
293  }
294 
295  p0->error = error_node->errors[error0];
296 
297  from += 1;
298  n_left_from -= 1;
299  to_next += 1;
300  n_left_to_next -= 1;
301 
302  if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
303  {
304  nsh_output_trace_t *tr = vlib_add_trace (vm, node,
305  p0, sizeof (*tr));
306  tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
307  tr->flow_hash = vnet_buffer(p0)->ip.flow_hash;
308  }
309 
310  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
311  to_next, n_left_to_next,
312  pi0, next0);
313  }
314 
315  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
316  }
317 
318  return from_frame->n_vectors;
319 }
320 
322 {
325 
327  vlib_node_runtime_t * node,
328  vlib_frame_t * from_frame)
329 {
330  return (nsh_output_inline(vm, node, from_frame, /* is_midchain */ 0));
331 }
332 
334  .name = "nsh-eth-output",
335  /* Takes a vector of packets. */
336  .vector_size = sizeof (u32),
337  .n_next_nodes = NSH_OUTPUT_N_NEXT,
338  .next_nodes = {
339 #define _(s,n) [NSH_OUTPUT_NEXT_##s] = n,
341 #undef _
342  },
343 
344  .format_trace = format_nsh_output_trace,
345 };
346 
348  vlib_node_runtime_t * node,
349  vlib_frame_t * from_frame)
350 {
351  return (nsh_output_inline(vm, node, from_frame, /* is_midchain */ 1));
352 }
353 
355  .name = "nsh-midchain",
356  .vector_size = sizeof (u32),
357  .format_trace = format_nsh_output_trace,
358  .n_next_nodes = 1,
359  .next_nodes = {
360  [NSH_MIDCHAIN_NEXT_DROP] = "error-drop",
361  },
362 };
363 
364 /* Built-in nsh tx feature path definition */
365 VNET_FEATURE_INIT (nsh_interface_output, static) = {
366  .arc_name = "nsh-eth-output",
367  .node_name = "interface-output",
368  .runs_before = 0, /* not before any other features */
369 };
370 
371 /* Built-in ip4 tx feature path definition */
372 /* *INDENT-OFF* */
373 VNET_FEATURE_ARC_INIT (nsh_eth_output, static) =
374 {
375  .arc_name = "nsh-eth-output",
376  .start_nodes = VNET_FEATURES ("nsh-midchain"),
377 };
378 
379 VNET_FEATURE_INIT (nsh_eth_tx_drop, static) =
380 {
381  .arc_name = "nsh-eth-output",
382  .node_name = "error-drop",
383  .runs_before = 0, /* not before any other features */
384 };
385 /* *INDENT-ON* */
386 /**
387  * @brief Next index values from the NSH incomplete adj node
388  */
389 #define foreach_nsh_adj_incomplete_next \
390 _(DROP, "error-drop") \
391 _(IP4, "ip4-arp") \
392 _(IP6, "ip6-discover-neighbor")
393 
394 typedef enum {
395 #define _(s,n) NSH_ADJ_INCOMPLETE_NEXT_##s,
397 #undef _
400 
401 /**
402  * @brief A struct to hold tracing information for the NSH label imposition
403  * node.
404  */
406 {
409 
410 
411 /**
412  * @brief Graph node for incomplete NSH adjacency.
413  * This node will push traffic to either the v4-arp or v6-nd node
414  * based on the next-hop proto of the adj.
415  * We pay a cost for this 'routing' node, but an incomplete adj is the
416  * exception case.
417  */
419  vlib_node_runtime_t * node,
420  vlib_frame_t * from_frame)
421 {
422  u32 n_left_from, next_index, * from, * to_next;
423 
424  from = vlib_frame_vector_args (from_frame);
425  n_left_from = from_frame->n_vectors;
426  next_index = node->cached_next_index;
427 
428  while (n_left_from > 0)
429  {
430  u32 n_left_to_next;
431 
432  vlib_get_next_frame (vm, node, next_index,
433  to_next, n_left_to_next);
434 
435  while (n_left_from > 0 && n_left_to_next > 0)
436  {
437  u32 pi0, next0, adj_index0;
438  ip_adjacency_t * adj0;
439  vlib_buffer_t * p0;
440 
441  pi0 = to_next[0] = from[0];
442  p0 = vlib_get_buffer (vm, pi0);
443  from += 1;
444  n_left_from -= 1;
445  to_next += 1;
446  n_left_to_next -= 1;
447 
448  adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
449 
450  adj0 = adj_get(adj_index0);
451 
453  {
454  next0 = NSH_ADJ_INCOMPLETE_NEXT_IP4;
455  }
456  else
457  {
458  next0 = NSH_ADJ_INCOMPLETE_NEXT_IP6;
459  }
460 
461  if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
462  {
464  vlib_add_trace (vm, node, p0, sizeof (*tr));
465  tr->next = next0;
466  }
467 
468  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
469  to_next, n_left_to_next,
470  pi0, next0);
471  }
472 
473  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
474  }
475 
476  return from_frame->n_vectors;
477 }
478 
479 static u8 *
480 format_nsh_adj_incomplete_trace (u8 * s, va_list * args)
481 {
482  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
483  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
485  uword indent;
486 
487  t = va_arg (*args, nsh_adj_incomplete_trace_t *);
488  indent = format_get_indent (s);
489 
490  s = format (s, "%Unext:%d",
491  format_white_space, indent,
492  t->next);
493  return (s);
494 }
495 
497  .name = "nsh-adj-incomplete",
498  .format_trace = format_nsh_adj_incomplete_trace,
499  /* Takes a vector of packets. */
500  .vector_size = sizeof (u32),
501  .n_next_nodes = NSH_ADJ_INCOMPLETE_N_NEXT,
502  .next_nodes = {
503 #define _(s,n) [NSH_ADJ_INCOMPLETE_NEXT_##s] = n,
505 #undef _
506  },
507 };
508 
nsh_midchain_next_t_
Definition: nsh_output.c:321
#define vnet_rewrite_one_header(rw0, p0, most_likely_size)
Definition: rewrite.h:199
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
enum nsh_midchain_next_t_ nsh_midchain_next_t
#define CLIB_UNUSED(x)
Definition: clib.h:82
format_function_t format_ip_adjacency_packet_data
Definition: format.h:59
struct ip_adjacency_t_::@46::@48 midchain
IP_LOOKUP_NEXT_MIDCHAIN.
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:220
#define PREDICT_TRUE(x)
Definition: clib.h:112
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:110
IP unicast adjacency.
Definition: adj.h:221
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:113
u8 data[0]
Packet data.
Definition: buffer.h:181
VNET_FEATURE_ARC_INIT(nsh_eth_output, static)
static u32 format_get_indent(u8 *s)
Definition: format.h:72
vlib_node_registration_t nsh_adj_incomplete_node
(constructor) VLIB_REGISTER_NODE (nsh_adj_incomplete_node)
Definition: nsh_output.c:496
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define VLIB_NODE_FN(node)
Definition: node.h:201
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:468
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:366
u8 output_feature_arc_index
Definition: nsh.h:160
unsigned char u8
Definition: types.h:56
A struct to hold tracing information for the NSH label imposition node.
Definition: nsh_output.c:405
u8 packet_data[64 - 1 *sizeof(u32)]
Definition: nsh_output.c:29
VNET_FEATURE_INIT(nsh_interface_output, static)
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:433
format_function_t format_ip_adjacency
Definition: format.h:58
vlib_node_registration_t nsh_midchain_node
(constructor) VLIB_REGISTER_NODE (nsh_midchain_node)
Definition: nsh_output.c:354
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:113
struct nsh_adj_incomplete_trace_t_ nsh_adj_incomplete_trace_t
A struct to hold tracing information for the NSH label imposition node.
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
vlib_node_registration_t nsh_eth_output_node
(constructor) VLIB_REGISTER_NODE (nsh_eth_output_node)
Definition: nsh_output.c:333
unsigned int u32
Definition: types.h:88
static u8 * format_nsh_output_trace(u8 *s, va_list *args)
Definition: nsh_output.c:44
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
static uword nsh_output_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, int is_midchain)
Definition: nsh_output.c:63
#define PREDICT_FALSE(x)
Definition: clib.h:111
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:338
vlib_combined_counter_main_t adjacency_counters
Adjacency packet counters.
Definition: adj.c:25
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:395
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:212
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:312
static vlib_node_runtime_t * vlib_node_get_runtime(vlib_main_t *vm, u32 node_index)
Get node runtime by node index.
Definition: node_funcs.h:89
nsh_main_t nsh_main
Definition: nsh.c:28
static u8 * format_nsh_adj_incomplete_trace(u8 *s, va_list *args)
Definition: nsh_output.c:480
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:458
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
#define foreach_nsh_output_next
Definition: nsh_output.c:32
#define VNET_FEATURES(...)
Definition: feature.h:435
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
fib_protocol_t ia_nh_proto
The protocol of the neighbor/peer.
Definition: adj.h:249
Definition: defs.h:47
union ip_adjacency_t_::@46 sub_type
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
#define foreach_nsh_adj_incomplete_next
Next index values from the NSH incomplete adj node.
Definition: nsh_output.c:389
nsh_output_next_t
Definition: nsh_output.c:36
#define vnet_buffer(b)
Definition: buffer.h:369
#define vnet_rewrite_two_headers(rw0, rw1, p0, p1, most_likely_size)
Definition: rewrite.h:204
This adjacency/interface has output features configured.
Definition: rewrite.h:57
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
nsh_adj_incomplete_next_t
Definition: nsh_output.c:394
static_always_inline void vnet_feature_arc_start(u8 arc, u32 sw_if_index, u32 *next0, vlib_buffer_t *b0)
Definition: feature.h:275