FD.io VPP  v19.08-27-gf4dcae4
Vector Packet Processing
l2_input_vtr.c
Go to the documentation of this file.
1 /*
2  * l2_input_vtr.c : layer 2 input vlan tag rewrite processing
3  *
4  * Copyright (c) 2013 Cisco 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/vnet.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/packet.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vnet/l2/feat_bitmap.h>
24 #include <vnet/l2/l2_vtr.h>
25 #include <vnet/l2/l2_input_vtr.h>
26 #include <vnet/l2/l2_output.h>
27 
28 #include <vppinfra/error.h>
29 #include <vppinfra/cache.h>
30 
31 
32 typedef struct
33 {
34  /* per-pkt trace data */
35  u8 src[6];
36  u8 dst[6];
37  u8 raw[12]; /* raw data (vlans) */
40 
41 /* packet trace format function */
42 static u8 *
43 format_l2_invtr_trace (u8 * s, va_list * args)
44 {
45  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
46  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
47  l2_invtr_trace_t *t = va_arg (*args, l2_invtr_trace_t *);
48 
49  s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
50  "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
51  t->sw_if_index,
54  t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4],
55  t->raw[5], t->raw[6], t->raw[7], t->raw[8], t->raw[9],
56  t->raw[10], t->raw[11]);
57  return s;
58 }
59 
60 #ifndef CLIB_MARCH_VARIANT
62 #endif /* CLIB_MARCH_VARIANT */
63 
64 #define foreach_l2_invtr_error \
65 _(L2_INVTR, "L2 inverter packets") \
66 _(DROP, "L2 input tag rewrite drops")
67 
68 typedef enum
69 {
70 #define _(sym,str) L2_INVTR_ERROR_##sym,
72 #undef _
75 
76 static char *l2_invtr_error_strings[] = {
77 #define _(sym,string) string,
79 #undef _
80 };
81 
82 typedef enum
83 {
87 
88 
90  vlib_node_runtime_t * node,
91  vlib_frame_t * frame)
92 {
93  u32 n_left_from, *from, *to_next;
94  l2_invtr_next_t next_index;
96 
97  from = vlib_frame_vector_args (frame);
98  n_left_from = frame->n_vectors; /* number of packets to process */
99  next_index = node->cached_next_index;
100 
101  while (n_left_from > 0)
102  {
103  u32 n_left_to_next;
104 
105  /* get space to enqueue frame to graph node "next_index" */
106  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
107 
108  while (n_left_from >= 6 && n_left_to_next >= 2)
109  {
110  u32 bi0, bi1;
111  vlib_buffer_t *b0, *b1;
112  u32 next0, next1;
113  u32 sw_if_index0, sw_if_index1;
114 
115  /* Prefetch next iteration. */
116  {
117  vlib_buffer_t *p2, *p3, *p4, *p5;
118  u32 sw_if_index2, sw_if_index3;
119 
120  p2 = vlib_get_buffer (vm, from[2]);
121  p3 = vlib_get_buffer (vm, from[3]);
122  p4 = vlib_get_buffer (vm, from[4]);
123  p5 = vlib_get_buffer (vm, from[5]);
124 
125  /* Prefetch the buffer header and packet for the N+2 loop iteration */
126  vlib_prefetch_buffer_header (p4, LOAD);
127  vlib_prefetch_buffer_header (p5, LOAD);
128 
131 
132  /*
133  * Prefetch the input config for the N+1 loop iteration
134  * This depends on the buffer header above
135  */
136  sw_if_index2 = vnet_buffer (p2)->sw_if_index[VLIB_RX];
137  sw_if_index3 = vnet_buffer (p3)->sw_if_index[VLIB_RX];
139  (l2output_main.configs, sw_if_index2),
140  CLIB_CACHE_LINE_BYTES, LOAD);
142  (l2output_main.configs, sw_if_index3),
143  CLIB_CACHE_LINE_BYTES, LOAD);
144  }
145 
146  /* speculatively enqueue b0 and b1 to the current next frame */
147  /* bi is "buffer index", b is pointer to the buffer */
148  to_next[0] = bi0 = from[0];
149  to_next[1] = bi1 = from[1];
150  from += 2;
151  to_next += 2;
152  n_left_from -= 2;
153  n_left_to_next -= 2;
154 
155  b0 = vlib_get_buffer (vm, bi0);
156  b1 = vlib_get_buffer (vm, bi1);
157 
158  /* RX interface handles */
159  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
160  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
161 
162  /* Determine the next node */
163  next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
164  L2INPUT_FEAT_VTR);
165  next1 = vnet_l2_feature_next (b1, msm->feat_next_node_index,
166  L2INPUT_FEAT_VTR);
167 
168  l2_output_config_t *config0;
169  l2_output_config_t *config1;
170  config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
171  config1 = vec_elt_at_index (l2output_main.configs, sw_if_index1);
172 
173  if (PREDICT_FALSE (config0->out_vtr_flag))
174  {
175  if (config0->output_vtr.push_and_pop_bytes)
176  {
177  /* perform the tag rewrite on two packets */
178  if (l2_vtr_process (b0, &config0->input_vtr))
179  {
180  /* Drop packet */
181  next0 = L2_INVTR_NEXT_DROP;
182  b0->error = node->errors[L2_INVTR_ERROR_DROP];
183  }
184  }
185  else if (config0->output_pbb_vtr.push_and_pop_bytes)
186  {
187  if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
188  {
189  /* Drop packet */
190  next0 = L2_INVTR_NEXT_DROP;
191  b0->error = node->errors[L2_INVTR_ERROR_DROP];
192  }
193  }
194  }
195  if (PREDICT_FALSE (config1->out_vtr_flag))
196  {
197  if (config1->output_vtr.push_and_pop_bytes)
198  {
199  if (l2_vtr_process (b1, &config1->input_vtr))
200  {
201  /* Drop packet */
202  next1 = L2_INVTR_NEXT_DROP;
203  b1->error = node->errors[L2_INVTR_ERROR_DROP];
204  }
205  }
206  else if (config1->output_pbb_vtr.push_and_pop_bytes)
207  {
208  if (l2_pbb_process (b1, &(config1->input_pbb_vtr)))
209  {
210  /* Drop packet */
211  next1 = L2_INVTR_NEXT_DROP;
212  b1->error = node->errors[L2_INVTR_ERROR_DROP];
213  }
214  }
215  }
216 
217  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
218  {
219  if (b0->flags & VLIB_BUFFER_IS_TRACED)
220  {
221  l2_invtr_trace_t *t =
222  vlib_add_trace (vm, node, b0, sizeof (*t));
224  t->sw_if_index = sw_if_index0;
225  clib_memcpy_fast (t->src, h0->src_address, 6);
226  clib_memcpy_fast (t->dst, h0->dst_address, 6);
227  clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
228  }
229  if (b1->flags & VLIB_BUFFER_IS_TRACED)
230  {
231  l2_invtr_trace_t *t =
232  vlib_add_trace (vm, node, b1, sizeof (*t));
234  t->sw_if_index = sw_if_index0;
235  clib_memcpy_fast (t->src, h1->src_address, 6);
236  clib_memcpy_fast (t->dst, h1->dst_address, 6);
237  clib_memcpy_fast (t->raw, &h1->type, sizeof (t->raw));
238  }
239  }
240 
241  /* verify speculative enqueues, maybe switch current next frame */
242  /* if next0==next1==next_index then nothing special needs to be done */
243  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
244  to_next, n_left_to_next,
245  bi0, bi1, next0, next1);
246  }
247 
248  while (n_left_from > 0 && n_left_to_next > 0)
249  {
250  u32 bi0;
251  vlib_buffer_t *b0;
252  u32 next0;
253  u32 sw_if_index0;
254 
255  /* speculatively enqueue b0 to the current next frame */
256  bi0 = from[0];
257  to_next[0] = bi0;
258  from += 1;
259  to_next += 1;
260  n_left_from -= 1;
261  n_left_to_next -= 1;
262 
263  b0 = vlib_get_buffer (vm, bi0);
264 
265  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
266 
267  /* Determine the next node */
268  next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
269  L2INPUT_FEAT_VTR);
270 
271  l2_output_config_t *config0;
272  config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
273 
274  if (PREDICT_FALSE (config0->out_vtr_flag))
275  {
276  if (config0->output_vtr.push_and_pop_bytes)
277  {
278  /* perform the tag rewrite on one packet */
279  if (l2_vtr_process (b0, &config0->input_vtr))
280  {
281  /* Drop packet */
282  next0 = L2_INVTR_NEXT_DROP;
283  b0->error = node->errors[L2_INVTR_ERROR_DROP];
284  }
285  }
286  else if (config0->output_pbb_vtr.push_and_pop_bytes)
287  {
288  if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
289  {
290  /* Drop packet */
291  next0 = L2_INVTR_NEXT_DROP;
292  b0->error = node->errors[L2_INVTR_ERROR_DROP];
293  }
294  }
295  }
296 
297  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
298  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
299  {
300  l2_invtr_trace_t *t =
301  vlib_add_trace (vm, node, b0, sizeof (*t));
303  t->sw_if_index = sw_if_index0;
304  clib_memcpy_fast (t->src, h0->src_address, 6);
305  clib_memcpy_fast (t->dst, h0->dst_address, 6);
306  clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
307  }
308 
309  /* verify speculative enqueue, maybe switch current next frame */
310  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
311  to_next, n_left_to_next,
312  bi0, next0);
313  }
314 
315  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
316  }
317 
318  return frame->n_vectors;
319 }
320 
321 
322 /* *INDENT-OFF* */
324  .name = "l2-input-vtr",
325  .vector_size = sizeof (u32),
326  .format_trace = format_l2_invtr_trace,
328 
329  .n_errors = ARRAY_LEN(l2_invtr_error_strings),
330  .error_strings = l2_invtr_error_strings,
331 
332  .n_next_nodes = L2_INVTR_N_NEXT,
333 
334  /* edit / add dispositions here */
335  .next_nodes = {
336  [L2_INVTR_NEXT_DROP] = "error-drop",
337  },
338 };
339 /* *INDENT-ON* */
340 
341 #ifndef CLIB_MARCH_VARIANT
342 clib_error_t *
344 {
346 
347  mp->vlib_main = vm;
348  mp->vnet_main = vnet_get_main ();
349 
350  /* Initialize the feature next-node indexes */
352  l2_invtr_node.index,
356 
357  return 0;
358 }
359 
361 #endif /* CLIB_MARCH_VARIANT */
362 
363 
364 /*
365  * fd.io coding-style-patch-verification: ON
366  *
367  * Local Variables:
368  * eval: (c-set-style "gnu")
369  * End:
370  */
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
l2_invtr_error_t
Definition: l2_input_vtr.c:68
#define CLIB_UNUSED(x)
Definition: clib.h:82
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
u8 src_address[6]
Definition: packet.h:56
static char * l2_invtr_error_strings[]
Definition: l2_input_vtr.c:76
u8 data[0]
Packet data.
Definition: buffer.h:181
vlib_main_t * vlib_main
Definition: l2_input_vtr.h:39
vl_api_address_t src
Definition: gre.api:51
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define foreach_l2_invtr_error
Definition: l2_input_vtr.c:64
#define VLIB_NODE_FN(node)
Definition: node.h:201
static u32 l2_pbb_process(vlib_buffer_t *b0, ptr_config_t *config)
Definition: l2_vtr.h:201
unsigned char u8
Definition: types.h:56
static u32 vnet_l2_feature_next(vlib_buffer_t *b, u32 *next_nodes, u32 feat_bit)
Return the graph node index for the feature corresponding to the next set bit after clearing the curr...
Definition: feat_bitmap.h:94
u16 push_and_pop_bytes
Definition: l2_vtr.h:64
u16 push_and_pop_bytes
Definition: l2_vtr.h:196
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
ptr_config_t output_pbb_vtr
Definition: l2_output.h:39
u8 dst_address[6]
Definition: packet.h:55
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
static u8 * format_l2_invtr_trace(u8 *s, va_list *args)
Definition: l2_input_vtr.c:43
unsigned int u32
Definition: types.h:88
vl_api_fib_path_type_t type
Definition: fib_types.api:123
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
static u32 l2_vtr_process(vlib_buffer_t *b0, vtr_config_t *config)
Perform the configured tag rewrite on the packet.
Definition: l2_vtr.h:75
vtr_config_t input_vtr
Definition: l2_output.h:36
clib_error_t * l2_invtr_init(vlib_main_t *vm)
Definition: l2_input_vtr.c:343
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define PREDICT_FALSE(x)
Definition: clib.h:111
l2output_main_t l2output_main
Definition: l2_output.c:78
#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
vnet_main_t * vnet_main
Definition: l2_input_vtr.h:40
#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
vl_api_address_t dst
Definition: gre.api:52
#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
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:312
static void feat_bitmap_init_next_nodes(vlib_main_t *vm, u32 node_index, u32 num_features, char **feat_names, u32 *next_nodes)
Initialize the feature next-node indexes of a graph node.
Definition: feat_bitmap.h:43
#define ARRAY_LEN(x)
Definition: clib.h:62
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
char ** l2input_get_feat_names(void)
Return an array of strings containing graph node names of each feature.
Definition: l2_input.c:62
vtr_config_t output_vtr
Definition: l2_output.h:37
l2_invtr_main_t l2_invtr_main
Definition: l2_input_vtr.c:61
vlib_node_registration_t l2_invtr_node
(constructor) VLIB_REGISTER_NODE (l2_invtr_node)
Definition: l2_input_vtr.c:323
l2_invtr_next_t
Definition: l2_input_vtr.c:82
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:55
ptr_config_t input_pbb_vtr
Definition: l2_output.h:38
VLIB buffer representation.
Definition: buffer.h:102
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
l2_output_config_t * configs
Definition: l2_output.h:67
#define vnet_buffer(b)
Definition: buffer.h:361
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
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
u32 feat_next_node_index[32]
Definition: l2_input_vtr.h:36
Definition: defs.h:46