FD.io VPP  v18.04-17-g3a0d853
Vector Packet Processing
node.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  * hdlc_node.c: hdlc packet processing
17  *
18  * Copyright (c) 2010 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #include <vlib/vlib.h>
41 #include <vnet/pg/pg.h>
42 #include <vnet/hdlc/hdlc.h>
43 #include <vppinfra/sparse_vec.h>
44 
45 #define foreach_hdlc_input_next \
46  _ (PUNT, "error-punt") \
47  _ (DROP, "error-drop")
48 
49 typedef enum
50 {
51 #define _(s,n) HDLC_INPUT_NEXT_##s,
53 #undef _
56 
57 typedef struct
58 {
59  u8 packet_data[32];
61 
62 static u8 *
63 format_hdlc_input_trace (u8 * s, va_list * va)
64 {
65  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
66  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
67  hdlc_input_trace_t *t = va_arg (*va, hdlc_input_trace_t *);
68 
69  s = format (s, "%U", format_hdlc_header, t->packet_data);
70 
71  return s;
72 }
73 
74 typedef struct
75 {
76  /* Sparse vector mapping hdlc protocol in network byte order
77  to next index. */
79 
82 
83 static uword
85  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
86 {
87  hdlc_input_runtime_t *rt = (void *) node->runtime_data;
88  u32 n_left_from, next_index, i_next, *from, *to_next;
89 
90  from = vlib_frame_vector_args (from_frame);
91  n_left_from = from_frame->n_vectors;
92 
93  if (node->flags & VLIB_NODE_FLAG_TRACE)
95  from,
96  n_left_from,
97  sizeof (from[0]),
98  sizeof (hdlc_input_trace_t));
99 
100  next_index = node->cached_next_index;
101  i_next = vec_elt (rt->sparse_index_by_next_index, next_index);
102 
103  while (n_left_from > 0)
104  {
105  u32 n_left_to_next;
106 
107  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
108 
109  while (n_left_from >= 4 && n_left_to_next >= 2)
110  {
111  u32 bi0, bi1;
112  vlib_buffer_t *b0, *b1;
113  hdlc_header_t *h0, *h1;
114  u32 i0, i1, len0, len1, protocol0, protocol1, enqueue_code;
115 
116  /* Prefetch next iteration. */
117  {
118  vlib_buffer_t *b2, *b3;
119 
120  b2 = vlib_get_buffer (vm, from[2]);
121  b3 = vlib_get_buffer (vm, from[3]);
122 
123  vlib_prefetch_buffer_header (b2, LOAD);
124  vlib_prefetch_buffer_header (b3, LOAD);
125 
126  CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
127  CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
128  }
129 
130  bi0 = from[0];
131  bi1 = from[1];
132  to_next[0] = bi0;
133  to_next[1] = bi1;
134  from += 2;
135  to_next += 2;
136  n_left_to_next -= 2;
137  n_left_from -= 2;
138 
139  b0 = vlib_get_buffer (vm, bi0);
140  b1 = vlib_get_buffer (vm, bi1);
141 
142  h0 = (void *) (b0->data + b0->current_data);
143  h1 = (void *) (b1->data + b1->current_data);
144 
145  protocol0 = h0->protocol;
146  protocol1 = h1->protocol;
147 
148  /* Add padding bytes for OSI protocols. */
149  len0 = sizeof (h0[0]);
150  len1 = sizeof (h1[0]);
151 
152  len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
153  len1 += protocol1 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
154 
155  b0->current_data += len0;
156  b1->current_data += len1;
157 
158  b0->current_length -= len0;
159  b1->current_length -= len1;
160 
161  /* Index sparse array with network byte order. */
162  sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0,
163  &i1);
164 
165  b0->error =
166  node->errors[i0 ==
168  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
169  b1->error =
170  node->errors[i1 ==
172  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
173 
174  enqueue_code = (i0 != i_next) + 2 * (i1 != i_next);
175 
176  if (PREDICT_FALSE (enqueue_code != 0))
177  {
178  switch (enqueue_code)
179  {
180  case 1:
181  /* A B A */
182  to_next[-2] = bi1;
183  to_next -= 1;
184  n_left_to_next += 1;
185  vlib_set_next_frame_buffer (vm, node,
187  i0), bi0);
188  break;
189 
190  case 2:
191  /* A A B */
192  to_next -= 1;
193  n_left_to_next += 1;
194  vlib_set_next_frame_buffer (vm, node,
196  i1), bi1);
197  break;
198 
199  case 3:
200  /* A B B or A B C */
201  to_next -= 2;
202  n_left_to_next += 2;
203  vlib_set_next_frame_buffer (vm, node,
205  i0), bi0);
206  vlib_set_next_frame_buffer (vm, node,
208  i1), bi1);
209  if (i0 == i1)
210  {
211  vlib_put_next_frame (vm, node, next_index,
212  n_left_to_next);
213  i_next = i1;
214  next_index = vec_elt (rt->next_by_protocol, i_next);
215  vlib_get_next_frame (vm, node, next_index, to_next,
216  n_left_to_next);
217  }
218  }
219  }
220  }
221 
222  while (n_left_from > 0 && n_left_to_next > 0)
223  {
224  u32 bi0;
225  vlib_buffer_t *b0;
226  hdlc_header_t *h0;
227  u32 i0, len0, protocol0;
228 
229  bi0 = from[0];
230  to_next[0] = bi0;
231  from += 1;
232  to_next += 1;
233  n_left_from -= 1;
234  n_left_to_next -= 1;
235 
236  b0 = vlib_get_buffer (vm, bi0);
237 
238  h0 = (void *) (b0->data + b0->current_data);
239 
240  protocol0 = h0->protocol;
241 
242  /* Add padding bytes for OSI protocols. */
243  len0 = sizeof (h0[0]);
244  len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
245 
246  b0->current_data += len0;
247  b0->current_length -= len0;
248 
249  i0 = sparse_vec_index (rt->next_by_protocol, protocol0);
250 
251  b0->error =
252  node->errors[i0 ==
254  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
255 
256  /* Sent packet to wrong next? */
257  if (PREDICT_FALSE (i0 != i_next))
258  {
259  /* Return old frame; remove incorrectly enqueued packet. */
260  vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
261 
262  /* Send to correct next. */
263  i_next = i0;
264  next_index = vec_elt (rt->next_by_protocol, i_next);
265  vlib_get_next_frame (vm, node, next_index,
266  to_next, n_left_to_next);
267 
268  to_next[0] = bi0;
269  to_next += 1;
270  n_left_to_next -= 1;
271  }
272  }
273 
274  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
275  }
276 
277  return from_frame->n_vectors;
278 }
279 
280 static char *hdlc_error_strings[] = {
281 #define hdlc_error(n,s) s,
282 #include "error.def"
283 #undef hdlc_error
284 };
285 
286 /* *INDENT-OFF* */
288  .function = hdlc_input,
289  .name = "hdlc-input",
290  /* Takes a vector of packets. */
291  .vector_size = sizeof (u32),
292 
293  .runtime_data_bytes = sizeof (hdlc_input_runtime_t),
294 
295  .n_errors = HDLC_N_ERROR,
296  .error_strings = hdlc_error_strings,
297 
298  .n_next_nodes = HDLC_INPUT_N_NEXT,
299  .next_nodes = {
300 #define _(s,n) [HDLC_INPUT_NEXT_##s] = n,
302 #undef _
303  },
304 
305  .format_buffer = format_hdlc_header_with_length,
306  .format_trace = format_hdlc_input_trace,
307  .unformat_buffer = unformat_hdlc_header,
308 };
309 /* *INDENT-ON* */
310 
311 static clib_error_t *
313 {
316 
318  ( /* elt bytes */ sizeof (rt->next_by_protocol[0]),
319  /* bits in index */ BITS (((hdlc_header_t *) 0)->protocol));
320 
321  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_DROP);
322  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_PUNT);
323  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_DROP]
325  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_PUNT]
327 
328  return 0;
329 }
330 
331 static clib_error_t *
333 {
334 
335  {
337  if (error)
338  clib_error_report (error);
339  }
340 
341  hdlc_setup_node (vm, hdlc_input_node.index);
343 
344  return 0;
345 }
346 
349 
350 void
352  hdlc_protocol_t protocol, u32 node_index)
353 {
354  hdlc_main_t *em = &hdlc_main;
357  u16 *n;
358  u32 i;
359 
360  {
362  if (error)
363  clib_error_report (error);
364  }
365 
366  pi = hdlc_get_protocol_info (em, protocol);
367  pi->node_index = node_index;
368  pi->next_index = vlib_node_add_next (vm, hdlc_input_node.index, node_index);
369 
370  /* Setup hdlc protocol -> next index sparse vector mapping. */
372  n =
374  clib_host_to_net_u16 (protocol));
375  n[0] = pi->next_index;
376 
377  /* Rebuild next index -> sparse index inverse mapping when sparse vector
378  is updated. */
380  for (i = 1; i < vec_len (rt->next_by_protocol); i++)
382 }
383 
384 /*
385  * fd.io coding-style-patch-verification: ON
386  *
387  * Local Variables:
388  * eval: (c-set-style "gnu")
389  * End:
390  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:434
static hdlc_protocol_info_t * hdlc_get_protocol_info(hdlc_main_t *em, hdlc_protocol_t protocol)
Definition: hdlc.h:83
#define CLIB_UNUSED(x)
Definition: clib.h:79
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:464
static void vlib_set_next_frame_buffer(vlib_main_t *vm, vlib_node_runtime_t *node, u32 next_index, u32 buffer_index)
Definition: node_funcs.h:397
static char * hdlc_error_strings[]
Definition: node.c:280
int i
static clib_error_t * hdlc_input_init(vlib_main_t *vm)
Definition: node.c:332
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
format_function_t format_hdlc_header_with_length
Definition: hdlc.h:98
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:415
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1110
hdlc_protocol_t
Definition: packet.h:52
static void hdlc_setup_node(vlib_main_t *vm, u32 node_index)
Definition: hdlc.h:110
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:104
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:111
#define sparse_vec_validate(v, i)
Definition: sparse_vec.h:214
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:191
static clib_error_t * hdlc_init(vlib_main_t *vm)
Definition: hdlc.c:228
hdlc_main_t hdlc_main
Definition: hdlc.c:44
static void sparse_vec_index2(void *v, u32 si0, u32 si1, u32 *i0_return, u32 *i1_return)
Definition: sparse_vec.h:160
#define vlib_call_init_function(vm, x)
Definition: init.h:162
u8 packet_data[32]
Definition: node.c:59
static u8 * format_hdlc_input_trace(u8 *s, va_list *va)
Definition: node.c:63
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:108
hdlc_input_next_t
Definition: node.c:49
static void * vlib_node_get_runtime_data(vlib_main_t *vm, u32 node_index)
Get node runtime private data by node index.
Definition: node_funcs.h:110
#define PREDICT_FALSE(x)
Definition: clib.h:105
#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:364
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:130
unformat_function_t unformat_hdlc_header
Definition: hdlc.h:106
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:74
vlib_main_t * vm
Definition: buffer.c:294
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:454
static uword sparse_vec_index(void *v, uword sparse_index)
Definition: sparse_vec.h:152
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:456
u32 * sparse_index_by_next_index
Definition: node.c:80
unsigned int u32
Definition: types.h:88
#define clib_error_report(e)
Definition: error.h:113
u16 * next_by_protocol
Definition: node.c:78
u64 uword
Definition: types.h:112
#define vec_elt(v, i)
Get vector value at index i.
void vlib_trace_frame_buffers_only(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, uword n_buffers, uword next_buffer_stride, uword n_buffer_data_bytes_in_trace)
Definition: trace.c:45
unsigned short u16
Definition: types.h:57
void hdlc_register_input_protocol(vlib_main_t *vm, hdlc_protocol_t protocol, u32 node_index)
Definition: node.c:351
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
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:267
static uword hdlc_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: node.c:84
u8 data[0]
Packet data.
Definition: buffer.h:179
static clib_error_t * hdlc_input_runtime_init(vlib_main_t *vm)
Definition: node.c:312
u16 flags
Copy of main node flags.
Definition: node.h:450
vlib_node_registration_t hdlc_input_node
(constructor) VLIB_REGISTER_NODE (hdlc_input_node)
Definition: node.c:287
format_function_t format_hdlc_header
Definition: hdlc.h:97
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
static void * sparse_vec_new(uword elt_bytes, uword sparse_index_bits)
Definition: sparse_vec.h:71
#define BITS(x)
Definition: clib.h:58
VLIB_WORKER_INIT_FUNCTION(hdlc_input_runtime_init)
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
#define foreach_hdlc_input_next
Definition: node.c:45
#define SPARSE_VEC_INVALID_INDEX
Definition: sparse_vec.h:68
u16 protocol
Definition: packet.h:68