FD.io VPP  v17.04.2-2-ga8f93f8
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 #define _(s,n) HDLC_INPUT_NEXT_##s,
52 #undef _
55 
56 typedef struct {
57  u8 packet_data[32];
59 
60 static u8 * format_hdlc_input_trace (u8 * s, va_list * va)
61 {
62  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
63  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
64  hdlc_input_trace_t * t = va_arg (*va, hdlc_input_trace_t *);
65 
66  s = format (s, "%U", format_hdlc_header, t->packet_data);
67 
68  return s;
69 }
70 
71 typedef struct {
72  /* Sparse vector mapping hdlc protocol in network byte order
73  to next index. */
75 
78 
79 static uword
81  vlib_node_runtime_t * node,
82  vlib_frame_t * from_frame)
83 {
84  hdlc_input_runtime_t * rt = (void *) node->runtime_data;
85  u32 n_left_from, next_index, i_next, * from, * to_next;
86 
87  from = vlib_frame_vector_args (from_frame);
88  n_left_from = from_frame->n_vectors;
89 
90  if (node->flags & VLIB_NODE_FLAG_TRACE)
92  from,
93  n_left_from,
94  sizeof (from[0]),
95  sizeof (hdlc_input_trace_t));
96 
97  next_index = node->cached_next_index;
98  i_next = vec_elt (rt->sparse_index_by_next_index, next_index);
99 
100  while (n_left_from > 0)
101  {
102  u32 n_left_to_next;
103 
104  vlib_get_next_frame (vm, node, next_index,
105  to_next, n_left_to_next);
106 
107  while (n_left_from >= 4 && n_left_to_next >= 2)
108  {
109  u32 bi0, bi1;
110  vlib_buffer_t * b0, * b1;
111  hdlc_header_t * h0, * h1;
112  u32 i0, i1, len0, len1, protocol0, protocol1, enqueue_code;
113 
114  /* Prefetch next iteration. */
115  {
116  vlib_buffer_t * b2, * b3;
117 
118  b2 = vlib_get_buffer (vm, from[2]);
119  b3 = vlib_get_buffer (vm, from[3]);
120 
121  vlib_prefetch_buffer_header (b2, LOAD);
122  vlib_prefetch_buffer_header (b3, LOAD);
123 
124  CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
125  CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
126  }
127 
128  bi0 = from[0];
129  bi1 = from[1];
130  to_next[0] = bi0;
131  to_next[1] = bi1;
132  from += 2;
133  to_next += 2;
134  n_left_to_next -= 2;
135  n_left_from -= 2;
136 
137  b0 = vlib_get_buffer (vm, bi0);
138  b1 = vlib_get_buffer (vm, bi1);
139 
140  h0 = (void *) (b0->data + b0->current_data);
141  h1 = (void *) (b1->data + b1->current_data);
142 
143  protocol0 = h0->protocol;
144  protocol1 = h1->protocol;
145 
146  /* Add padding bytes for OSI protocols. */
147  len0 = sizeof (h0[0]);
148  len1 = sizeof (h1[0]);
149 
150  len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
151  len1 += protocol1 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
152 
153  b0->current_data += len0;
154  b1->current_data += len1;
155 
156  b0->current_length -= len0;
157  b1->current_length -= len1;
158 
159  /* Index sparse array with network byte order. */
160  sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0, &i1);
161 
162  b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
163  b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
164 
165  enqueue_code = (i0 != i_next) + 2*(i1 != i_next);
166 
167  if (PREDICT_FALSE (enqueue_code != 0))
168  {
169  switch (enqueue_code)
170  {
171  case 1:
172  /* A B A */
173  to_next[-2] = bi1;
174  to_next -= 1;
175  n_left_to_next += 1;
176  vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0);
177  break;
178 
179  case 2:
180  /* A A B */
181  to_next -= 1;
182  n_left_to_next += 1;
183  vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1);
184  break;
185 
186  case 3:
187  /* A B B or A B C */
188  to_next -= 2;
189  n_left_to_next += 2;
190  vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0);
191  vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1);
192  if (i0 == i1)
193  {
194  vlib_put_next_frame (vm, node, next_index,
195  n_left_to_next);
196  i_next = i1;
197  next_index = vec_elt (rt->next_by_protocol, i_next);
198  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
199  }
200  }
201  }
202  }
203 
204  while (n_left_from > 0 && n_left_to_next > 0)
205  {
206  u32 bi0;
207  vlib_buffer_t * b0;
208  hdlc_header_t * h0;
209  u32 i0, len0, protocol0;
210 
211  bi0 = from[0];
212  to_next[0] = bi0;
213  from += 1;
214  to_next += 1;
215  n_left_from -= 1;
216  n_left_to_next -= 1;
217 
218  b0 = vlib_get_buffer (vm, bi0);
219 
220  h0 = (void *) (b0->data + b0->current_data);
221 
222  protocol0 = h0->protocol;
223 
224  /* Add padding bytes for OSI protocols. */
225  len0 = sizeof (h0[0]);
226  len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi);
227 
228  b0->current_data += len0;
229  b0->current_length -= len0;
230 
231  i0 = sparse_vec_index (rt->next_by_protocol, protocol0);
232 
233  b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE];
234 
235  /* Sent packet to wrong next? */
236  if (PREDICT_FALSE (i0 != i_next))
237  {
238  /* Return old frame; remove incorrectly enqueued packet. */
239  vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
240 
241  /* Send to correct next. */
242  i_next = i0;
243  next_index = vec_elt (rt->next_by_protocol, i_next);
244  vlib_get_next_frame (vm, node, next_index,
245  to_next, n_left_to_next);
246 
247  to_next[0] = bi0;
248  to_next += 1;
249  n_left_to_next -= 1;
250  }
251  }
252 
253  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
254  }
255 
256  return from_frame->n_vectors;
257 }
258 
259 static char * hdlc_error_strings[] = {
260 #define hdlc_error(n,s) s,
261 #include "error.def"
262 #undef hdlc_error
263 };
264 
266  .function = hdlc_input,
267  .name = "hdlc-input",
268  /* Takes a vector of packets. */
269  .vector_size = sizeof (u32),
270 
271  .runtime_data_bytes = sizeof (hdlc_input_runtime_t),
272 
273  .n_errors = HDLC_N_ERROR,
274  .error_strings = hdlc_error_strings,
275 
276  .n_next_nodes = HDLC_INPUT_N_NEXT,
277  .next_nodes = {
278 #define _(s,n) [HDLC_INPUT_NEXT_##s] = n,
280 #undef _
281  },
282 
283  .format_buffer = format_hdlc_header_with_length,
284  .format_trace = format_hdlc_input_trace,
285  .unformat_buffer = unformat_hdlc_header,
286 };
287 
289 {
292 
294  (/* elt bytes */ sizeof (rt->next_by_protocol[0]),
295  /* bits in index */ BITS (((hdlc_header_t *) 0)->protocol));
296 
297  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_DROP);
298  vec_validate (rt->sparse_index_by_next_index, HDLC_INPUT_NEXT_PUNT);
299  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_DROP]
301  rt->sparse_index_by_next_index[HDLC_INPUT_NEXT_PUNT]
303 
304  return 0;
305 }
306 
308 {
309 
310  {
312  if (error)
313  clib_error_report (error);
314  }
315 
316  hdlc_setup_node (vm, hdlc_input_node.index);
318 
319  return 0;
320 }
321 
324 
325 void
327  hdlc_protocol_t protocol,
328  u32 node_index)
329 {
330  hdlc_main_t * em = &hdlc_main;
333  u16 * n;
334  u32 i;
335 
336  {
338  if (error)
339  clib_error_report (error);
340  }
341 
342  pi = hdlc_get_protocol_info (em, protocol);
343  pi->node_index = node_index;
344  pi->next_index = vlib_node_add_next (vm,
345  hdlc_input_node.index,
346  node_index);
347 
348  /* Setup hdlc protocol -> next index sparse vector mapping. */
350  n = sparse_vec_validate (rt->next_by_protocol, clib_host_to_net_u16 (protocol));
351  n[0] = pi->next_index;
352 
353  /* Rebuild next index -> sparse index inverse mapping when sparse vector
354  is updated. */
356  for (i = 1; i < vec_len (rt->next_by_protocol); i++)
358 }
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:436
static hdlc_protocol_info_t * hdlc_get_protocol_info(hdlc_main_t *em, hdlc_protocol_t protocol)
Definition: hdlc.h:80
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
#define CLIB_UNUSED(x)
Definition: clib.h:79
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:463
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:383
static char * hdlc_error_strings[]
Definition: node.c:259
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
static clib_error_t * hdlc_input_init(vlib_main_t *vm)
Definition: node.c:307
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
format_function_t format_hdlc_header_with_length
Definition: hdlc.h:100
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:418
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1065
hdlc_protocol_t
Definition: packet.h:52
static void hdlc_setup_node(vlib_main_t *vm, u32 node_index)
Definition: hdlc.h:112
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:67
#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:164
static clib_error_t * hdlc_init(vlib_main_t *vm)
Definition: hdlc.c:225
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:57
static u8 * format_hdlc_input_trace(u8 *s, va_list *va)
Definition: node.c:60
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:71
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:109
#define PREDICT_FALSE(x)
Definition: clib.h:97
#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:350
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:113
unformat_function_t unformat_hdlc_header
Definition: hdlc.h:108
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
vlib_main_t * vm
Definition: buffer.c:276
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:455
u32 * sparse_index_by_next_index
Definition: node.c:76
unsigned int u32
Definition: types.h:88
#define clib_error_report(e)
Definition: error.h:125
u16 * next_by_protocol
Definition: node.c:74
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
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:326
#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:253
static uword hdlc_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: node.c:80
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:152
static clib_error_t * hdlc_input_runtime_init(vlib_main_t *vm)
Definition: node.c:288
u16 flags
Copy of main node flags.
Definition: node.h:449
vlib_node_registration_t hdlc_input_node
(constructor) VLIB_REGISTER_NODE (hdlc_input_node)
Definition: node.c:265
format_function_t format_hdlc_header
Definition: hdlc.h:99
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:66