FD.io VPP  v17.07-30-g839fa73
Vector Packet Processing
l2_input_vtr.c
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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 
61 
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 
89 static uword
91  vlib_node_runtime_t * node, 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  u32 feature_bitmap0, feature_bitmap1;
115 
116  /* Prefetch next iteration. */
117  {
118  vlib_buffer_t *p2, *p3, *p4, *p5;
119  u32 sw_if_index2, sw_if_index3;
120 
121  p2 = vlib_get_buffer (vm, from[2]);
122  p3 = vlib_get_buffer (vm, from[3]);
123  p4 = vlib_get_buffer (vm, from[4]);
124  p5 = vlib_get_buffer (vm, from[5]);
125 
126  /* Prefetch the buffer header and packet for the N+2 loop iteration */
127  vlib_prefetch_buffer_header (p4, LOAD);
128  vlib_prefetch_buffer_header (p5, LOAD);
129 
132 
133  /*
134  * Prefetch the input config for the N+1 loop iteration
135  * This depends on the buffer header above
136  */
137  sw_if_index2 = vnet_buffer (p2)->sw_if_index[VLIB_RX];
138  sw_if_index3 = vnet_buffer (p3)->sw_if_index[VLIB_RX];
140  (l2output_main.configs, sw_if_index2),
141  CLIB_CACHE_LINE_BYTES, LOAD);
143  (l2output_main.configs, sw_if_index3),
144  CLIB_CACHE_LINE_BYTES, LOAD);
145  }
146 
147  /* speculatively enqueue b0 and b1 to the current next frame */
148  /* bi is "buffer index", b is pointer to the buffer */
149  to_next[0] = bi0 = from[0];
150  to_next[1] = bi1 = from[1];
151  from += 2;
152  to_next += 2;
153  n_left_from -= 2;
154  n_left_to_next -= 2;
155 
156  b0 = vlib_get_buffer (vm, bi0);
157  b1 = vlib_get_buffer (vm, bi1);
158 
159  /* RX interface handles */
160  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
161  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
162 
163  /* process 2 packets */
164 
165  /* Remove ourself from the feature bitmap */
166  feature_bitmap0 =
167  vnet_buffer (b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
168  feature_bitmap1 =
169  vnet_buffer (b1)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
170 
171  /* save for next feature graph nodes */
172  vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap0;
173  vnet_buffer (b1)->l2.feature_bitmap = feature_bitmap1;
174 
175  /* Determine the next node */
177  feature_bitmap0);
179  feature_bitmap1);
180 
181  l2_output_config_t *config0;
182  l2_output_config_t *config1;
183  config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
184  config1 = vec_elt_at_index (l2output_main.configs, sw_if_index1);
185 
186  if (PREDICT_FALSE (config0->out_vtr_flag))
187  {
188  if (config0->output_vtr.push_and_pop_bytes)
189  {
190  /* perform the tag rewrite on two packets */
191  if (l2_vtr_process (b0, &config0->input_vtr))
192  {
193  /* Drop packet */
194  next0 = L2_INVTR_NEXT_DROP;
195  b0->error = node->errors[L2_INVTR_ERROR_DROP];
196  }
197  }
198  else if (config0->output_pbb_vtr.push_and_pop_bytes)
199  {
200  if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
201  {
202  /* Drop packet */
203  next0 = L2_INVTR_NEXT_DROP;
204  b0->error = node->errors[L2_INVTR_ERROR_DROP];
205  }
206  }
207  }
208  if (PREDICT_FALSE (config1->out_vtr_flag))
209  {
210  if (config1->output_vtr.push_and_pop_bytes)
211  {
212  if (l2_vtr_process (b1, &config1->input_vtr))
213  {
214  /* Drop packet */
215  next1 = L2_INVTR_NEXT_DROP;
216  b1->error = node->errors[L2_INVTR_ERROR_DROP];
217  }
218  }
219  else if (config1->output_pbb_vtr.push_and_pop_bytes)
220  {
221  if (l2_pbb_process (b1, &(config1->input_pbb_vtr)))
222  {
223  /* Drop packet */
224  next1 = L2_INVTR_NEXT_DROP;
225  b1->error = node->errors[L2_INVTR_ERROR_DROP];
226  }
227  }
228  }
229 
230  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
231  {
232  if (b0->flags & VLIB_BUFFER_IS_TRACED)
233  {
234  l2_invtr_trace_t *t =
235  vlib_add_trace (vm, node, b0, sizeof (*t));
237  t->sw_if_index = sw_if_index0;
238  clib_memcpy (t->src, h0->src_address, 6);
239  clib_memcpy (t->dst, h0->dst_address, 6);
240  clib_memcpy (t->raw, &h0->type, sizeof (t->raw));
241  }
242  if (b1->flags & VLIB_BUFFER_IS_TRACED)
243  {
244  l2_invtr_trace_t *t =
245  vlib_add_trace (vm, node, b1, sizeof (*t));
247  t->sw_if_index = sw_if_index0;
248  clib_memcpy (t->src, h1->src_address, 6);
249  clib_memcpy (t->dst, h1->dst_address, 6);
250  clib_memcpy (t->raw, &h1->type, sizeof (t->raw));
251  }
252  }
253 
254  /* verify speculative enqueues, maybe switch current next frame */
255  /* if next0==next1==next_index then nothing special needs to be done */
256  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
257  to_next, n_left_to_next,
258  bi0, bi1, next0, next1);
259  }
260 
261  while (n_left_from > 0 && n_left_to_next > 0)
262  {
263  u32 bi0;
264  vlib_buffer_t *b0;
265  u32 next0;
266  u32 sw_if_index0;
267  u32 feature_bitmap0;
268 
269  /* speculatively enqueue b0 to the current next frame */
270  bi0 = from[0];
271  to_next[0] = bi0;
272  from += 1;
273  to_next += 1;
274  n_left_from -= 1;
275  n_left_to_next -= 1;
276 
277  b0 = vlib_get_buffer (vm, bi0);
278 
279  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
280 
281  /* process 1 packet */
282 
283  /* Remove ourself from the feature bitmap */
284  feature_bitmap0 =
285  vnet_buffer (b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
286 
287  /* save for next feature graph nodes */
288  vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap0;
289 
290  /* Determine the next node */
292  feature_bitmap0);
293 
294  l2_output_config_t *config0;
295  config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
296 
297  if (PREDICT_FALSE (config0->out_vtr_flag))
298  {
299  if (config0->output_vtr.push_and_pop_bytes)
300  {
301  /* perform the tag rewrite on one packet */
302  if (l2_vtr_process (b0, &config0->input_vtr))
303  {
304  /* Drop packet */
305  next0 = L2_INVTR_NEXT_DROP;
306  b0->error = node->errors[L2_INVTR_ERROR_DROP];
307  }
308  }
309  else if (config0->output_pbb_vtr.push_and_pop_bytes)
310  {
311  if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
312  {
313  /* Drop packet */
314  next0 = L2_INVTR_NEXT_DROP;
315  b0->error = node->errors[L2_INVTR_ERROR_DROP];
316  }
317  }
318  }
319 
321  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
322  {
323  l2_invtr_trace_t *t =
324  vlib_add_trace (vm, node, b0, sizeof (*t));
326  t->sw_if_index = sw_if_index0;
327  clib_memcpy (t->src, h0->src_address, 6);
328  clib_memcpy (t->dst, h0->dst_address, 6);
329  clib_memcpy (t->raw, &h0->type, sizeof (t->raw));
330  }
331 
332  /* verify speculative enqueue, maybe switch current next frame */
333  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
334  to_next, n_left_to_next,
335  bi0, next0);
336  }
337 
338  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
339  }
340 
341  return frame->n_vectors;
342 }
343 
344 
345 /* *INDENT-OFF* */
347  .function = l2_invtr_node_fn,
348  .name = "l2-input-vtr",
349  .vector_size = sizeof (u32),
350  .format_trace = format_l2_invtr_trace,
351  .type = VLIB_NODE_TYPE_INTERNAL,
352 
353  .n_errors = ARRAY_LEN(l2_invtr_error_strings),
354  .error_strings = l2_invtr_error_strings,
355 
356  .n_next_nodes = L2_INVTR_N_NEXT,
357 
358  /* edit / add dispositions here */
359  .next_nodes = {
360  [L2_INVTR_NEXT_DROP] = "error-drop",
361  },
362 };
363 /* *INDENT-ON* */
364 
367 {
369 
370  mp->vlib_main = vm;
371  mp->vnet_main = vnet_get_main ();
372 
373  /* Initialize the feature next-node indexes */
375  l2_invtr_node.index,
379 
380  return 0;
381 }
382 
384 
385 
386 /*
387  * fd.io coding-style-patch-verification: ON
388  *
389  * Local Variables:
390  * eval: (c-set-style "gnu")
391  * End:
392  */
l2_invtr_error_t
Definition: l2_input_vtr.c:68
#define CLIB_UNUSED(x)
Definition: clib.h:79
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
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:459
u8 src_address[6]
Definition: packet.h:54
static char * l2_invtr_error_strings[]
Definition: l2_input_vtr.c:76
vlib_main_t * vlib_main
Definition: l2_input_vtr.h:39
struct _vlib_node_registration vlib_node_registration_t
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
#define foreach_l2_invtr_error
Definition: l2_input_vtr.c:64
static u32 l2_pbb_process(vlib_buffer_t *b0, ptr_config_t *config)
Definition: l2_vtr.h:199
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:419
u16 push_and_pop_bytes
Definition: l2_vtr.h:64
u16 push_and_pop_bytes
Definition: l2_vtr.h:194
u8 * format_ethernet_address(u8 *s, va_list *args)
Definition: format.c:44
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:111
ptr_config_t output_pbb_vtr
Definition: l2_output.h:41
u8 dst_address[6]
Definition: packet.h:53
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:164
#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
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:38
clib_error_t * l2_invtr_init(vlib_main_t *vm)
Definition: l2_input_vtr.c:366
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:188
#define PREDICT_FALSE(x)
Definition: clib.h:97
l2output_main_t l2output_main
Definition: l2_output.c:43
#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
static u32 feat_bitmap_get_next_node_index(u32 *next_nodes, u32 bitmap)
Return the graph node index for the feature corresponding to the first set bit in the bitmap...
Definition: feat_bitmap.h:79
#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:216
#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:366
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:113
u16 n_vectors
Definition: node.h:345
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
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 VLIB_BUFFER_IS_TRACED
Definition: buffer.h:85
#define clib_memcpy(a, b, c)
Definition: string.h:69
#define ARRAY_LEN(x)
Definition: clib.h:59
char ** l2input_get_feat_names(void)
Return an array of strings containing graph node names of each feature.
Definition: l2_input.c:58
vtr_config_t output_vtr
Definition: l2_output.h:39
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:460
unsigned int u32
Definition: types.h:88
l2_invtr_main_t l2_invtr_main
Definition: l2_input_vtr.c:60
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:260
u64 uword
Definition: types.h:112
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:40
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:269
l2_output_config_t * configs
Definition: l2_output.h:84
#define vnet_buffer(b)
Definition: buffer.h:303
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:159
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:144
u8 data[0]
Packet data.
Definition: buffer.h:152
static vlib_node_registration_t l2_invtr_node
(constructor) VLIB_REGISTER_NODE (l2_invtr_node)
Definition: l2_input_vtr.c:62
u16 flags
Copy of main node flags.
Definition: node.h:454
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:74
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
static uword l2_invtr_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: l2_input_vtr.c:90
u32 feat_next_node_index[32]
Definition: l2_input_vtr.h:36
Definition: defs.h:46