FD.io VPP  v19.08.3-2-gbabecb413
Vector Packet Processing
node.c
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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 = vlib_buffer_get_current (b0);
143  h1 = vlib_buffer_get_current (b1);
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  vlib_buffer_advance (b0, len0);
156  vlib_buffer_advance (b1, len1);
157 
158  /* Index sparse array with network byte order. */
159  sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0,
160  &i1);
161 
162  b0->error =
163  node->errors[i0 ==
165  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
166  b1->error =
167  node->errors[i1 ==
169  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
170 
171  enqueue_code = (i0 != i_next) + 2 * (i1 != i_next);
172 
173  if (PREDICT_FALSE (enqueue_code != 0))
174  {
175  switch (enqueue_code)
176  {
177  case 1:
178  /* A B A */
179  to_next[-2] = bi1;
180  to_next -= 1;
181  n_left_to_next += 1;
182  vlib_set_next_frame_buffer (vm, node,
184  i0), bi0);
185  break;
186 
187  case 2:
188  /* A A B */
189  to_next -= 1;
190  n_left_to_next += 1;
191  vlib_set_next_frame_buffer (vm, node,
193  i1), bi1);
194  break;
195 
196  case 3:
197  /* A B B or A B C */
198  to_next -= 2;
199  n_left_to_next += 2;
200  vlib_set_next_frame_buffer (vm, node,
202  i0), bi0);
203  vlib_set_next_frame_buffer (vm, node,
205  i1), bi1);
206  if (i0 == i1)
207  {
208  vlib_put_next_frame (vm, node, next_index,
209  n_left_to_next);
210  i_next = i1;
211  next_index = vec_elt (rt->next_by_protocol, i_next);
212  vlib_get_next_frame (vm, node, next_index, to_next,
213  n_left_to_next);
214  }
215  }
216  }
217  }
218 
219  while (n_left_from > 0 && n_left_to_next > 0)
220  {
221  u32 bi0;
222  vlib_buffer_t *b0;
223  hdlc_header_t *h0;
224  u32 i0, len0, protocol0;
225 
226  bi0 = from[0];
227  to_next[0] = bi0;
228  from += 1;
229  to_next += 1;
230  n_left_from -= 1;
231  n_left_to_next -= 1;
232 
233  b0 = vlib_get_buffer (vm, bi0);
234 
235  h0 = vlib_buffer_get_current (b0);
236 
237  protocol0 = h0->protocol;
238 
239  /* Add padding bytes for OSI protocols. */
240  len0 = sizeof (h0[0]);
241  len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
242 
243  vlib_buffer_advance (b0, len0);
244 
245  i0 = sparse_vec_index (rt->next_by_protocol, protocol0);
246 
247  b0->error =
248  node->errors[i0 ==
250  HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
251 
252  /* Sent packet to wrong next? */
253  if (PREDICT_FALSE (i0 != i_next))
254  {
255  /* Return old frame; remove incorrectly enqueued packet. */
256  vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
257 
258  /* Send to correct next. */
259  i_next = i0;
260  next_index = vec_elt (rt->next_by_protocol, i_next);
261  vlib_get_next_frame (vm, node, next_index,
262  to_next, n_left_to_next);
263 
264  to_next[0] = bi0;
265  to_next += 1;
266  n_left_to_next -= 1;
267  }
268  }
269 
270  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
271  }
272 
273  return from_frame->n_vectors;
274 }
275 
276 static char *hdlc_error_strings[] = {
277 #define hdlc_error(n,s) s,
278 #include "error.def"
279 #undef hdlc_error
280 };
281 
282 /* *INDENT-OFF* */
284  .function = hdlc_input,
285  .name = "hdlc-input",
286  /* Takes a vector of packets. */
287  .vector_size = sizeof (u32),
288 
289  .runtime_data_bytes = sizeof (hdlc_input_runtime_t),
290 
291  .n_errors = HDLC_N_ERROR,
292  .error_strings = hdlc_error_strings,
293 
294  .n_next_nodes = HDLC_INPUT_N_NEXT,
295  .next_nodes = {
296 #define _(s,n) [HDLC_INPUT_NEXT_##s] = n,
298 #undef _
299  },
300 
301  .format_buffer = format_hdlc_header_with_length,
302  .format_trace = format_hdlc_input_trace,
303  .unformat_buffer = unformat_hdlc_header,
304 };
305 /* *INDENT-ON* */
306 
307 static clib_error_t *
309 {
312 
314  ( /* elt bytes */ sizeof (rt->next_by_protocol[0]),
315  /* bits in index */ BITS (((hdlc_header_t *) 0)->protocol));
316 
317  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_DROP);
318  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_PUNT);
319  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_DROP]
321  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_PUNT]
323 
324  return 0;
325 }
326 
327 static clib_error_t *
329 {
330 
331  {
333  if (error)
334  clib_error_report (error);
335  }
336 
337  hdlc_setup_node (vm, hdlc_input_node.index);
339 
340  return 0;
341 }
342 
345 
346 void
348  hdlc_protocol_t protocol, u32 node_index)
349 {
350  hdlc_main_t *em = &hdlc_main;
353  u16 *n;
354  u32 i;
355 
356  {
358  if (error)
359  clib_error_report (error);
360  }
361 
362  pi = hdlc_get_protocol_info (em, protocol);
363  pi->node_index = node_index;
364  pi->next_index = vlib_node_add_next (vm, hdlc_input_node.index, node_index);
365 
366  /* Setup hdlc protocol -> next index sparse vector mapping. */
368  n =
370  clib_host_to_net_u16 (protocol));
371  n[0] = pi->next_index;
372 
373  /* Rebuild next index -> sparse index inverse mapping when sparse vector
374  is updated. */
376  for (i = 1; i < vec_len (rt->next_by_protocol); i++)
378 }
379 
380 /*
381  * fd.io coding-style-patch-verification: ON
382  *
383  * Local Variables:
384  * eval: (c-set-style "gnu")
385  * End:
386  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
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:83
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:523
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:371
static char * hdlc_error_strings[]
Definition: node.c:276
int i
static clib_error_t * hdlc_input_init(vlib_main_t *vm)
Definition: node.c:328
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
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:470
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1092
unsigned char u8
Definition: types.h:56
hdlc_protocol_t
Definition: packet.h:52
static void hdlc_setup_node(vlib_main_t *vm, u32 node_index)
Definition: hdlc.h:110
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
#define sparse_vec_validate(v, i)
Definition: sparse_vec.h:231
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
static clib_error_t * hdlc_init(vlib_main_t *vm)
Definition: hdlc.c:228
hdlc_main_t hdlc_main
Definition: hdlc.c:44
unsigned int u32
Definition: types.h:88
static void sparse_vec_index2(void *v, u32 si0, u32 si1, u32 *i0_return, u32 *i1_return)
Definition: sparse_vec.h:169
#define vlib_call_init_function(vm, x)
Definition: init.h:270
u8 packet_data[32]
Definition: node.c:59
static u8 * format_hdlc_input_trace(u8 *s, va_list *va)
Definition: node.c:63
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
hdlc_input_next_t
Definition: node.c:49
vl_api_ip_proto_t protocol
Definition: punt.api:39
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
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:112
#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
unformat_function_t unformat_hdlc_header
Definition: hdlc.h:106
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:397
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:323
u8 data[]
Packet data.
Definition: buffer.h:181
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:456
static uword sparse_vec_index(void *v, uword sparse_index)
Definition: sparse_vec.h:161
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:515
u32 * sparse_index_by_next_index
Definition: node.c:80
#define clib_error_report(e)
Definition: error.h:113
u16 * next_by_protocol
Definition: node.c:78
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
#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:47
void hdlc_register_input_protocol(vlib_main_t *vm, hdlc_protocol_t protocol, u32 node_index)
Definition: node.c:347
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
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
static uword hdlc_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: node.c:84
static clib_error_t * hdlc_input_runtime_init(vlib_main_t *vm)
Definition: node.c:308
u16 flags
Copy of main node flags.
Definition: node.h:509
vlib_node_registration_t hdlc_input_node
(constructor) VLIB_REGISTER_NODE (hdlc_input_node)
Definition: node.c:283
format_function_t format_hdlc_header
Definition: hdlc.h:97
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:302
static void * sparse_vec_new(uword elt_bytes, uword sparse_index_bits)
Definition: sparse_vec.h:71
#define BITS(x)
Definition: clib.h:62
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:85
#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