FD.io VPP  v20.09-64-g4f7b92f0a
Vector Packet Processing
gdb_funcs.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  * @file
17  * @brief Host utility functions
18  */
19 #include <vppinfra/format.h>
20 #include <vlib/vlib.h>
21 
22 #include <vlib/threads.h>
23 #include <vnet/vnet.h>
24 #include <vppinfra/format.h>
25 
26 /**
27  * @brief GDB callable function: vl - Return vector length of vector
28  *
29  * @param *p - void - address of vector
30  *
31  * @return length - u32
32  *
33  */
34 u32
35 vl (void *p)
36 {
37  return vec_len (p);
38 }
39 
40 /**
41  * @brief GDB callable function: pvh - Return vector header of vector
42  *
43  * @param *p - void - address of vector
44  *
45  * @return vh - vec_header_t, the vector header
46  *
47  */
49 pvh (void *p)
50 {
51  return _vec_find (p);
52 }
53 
54 
55 /**
56  * @brief GDB callable function: pe - call pool_elts - number of elements in a pool
57  *
58  * @param *v - void - address of pool
59  *
60  * @return number - uword
61  *
62  */
63 uword
64 pe (void *v)
65 {
66  return (pool_elts (v));
67 }
68 
69 /**
70  * @brief GDB callable function: pifi - call pool_is_free_index - is passed index free?
71  *
72  * @param *p - void - address of pool
73  * @param *index - u32
74  *
75  * @return 0|1 - int
76  *
77  */
78 int
79 pifi (void *p, u32 index)
80 {
81  return pool_is_free_index (p, index);
82 }
83 
84 /**
85  * @brief GDB callable function: debug_hex_bytes - return formatted hex string
86  *
87  * @param *s - u8
88  * @param n - u32 - number of bytes to format
89  *
90  */
91 void
93 {
94  fformat (stderr, "%U\n", format_hex_bytes, s, n);
95 }
96 
97 /**
98  * @brief GDB callable function: vlib_dump_frame_ownership
99  *
100  */
101 void
103 {
105  vlib_node_main_t *nm = &vm->node_main;
106  vlib_node_runtime_t *this_node_runtime;
107  vlib_next_frame_t *nf;
108  u32 first_nf_index;
109  u32 index;
110 
111  vec_foreach (this_node_runtime, nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL])
112  {
113  first_nf_index = this_node_runtime->next_frame_index;
114 
115  for (index = first_nf_index; index < first_nf_index +
116  this_node_runtime->n_next_nodes; index++)
117  {
118  vlib_node_runtime_t *owned_runtime;
119  nf = vec_elt_at_index (vm->node_main.next_frames, index);
120  if (nf->flags & VLIB_FRAME_OWNER)
121  {
122  owned_runtime = vec_elt_at_index (nm->nodes_by_type[0],
123  nf->node_runtime_index);
124  fformat (stderr,
125  "%s next index %d owns enqueue rights to %s\n",
126  nm->nodes[this_node_runtime->node_index]->name,
127  index - first_nf_index,
128  nm->nodes[owned_runtime->node_index]->name);
129  fformat (stderr, " nf index %d nf->frame %p\n",
130  nf - vm->node_main.next_frames, nf->frame);
131  }
132  }
133  }
134 }
135 
136 /**
137  * @brief GDB callable function: vlib_runtime_index_to_node_name
138  *
139  * Takes node index and will return the node name.
140  *
141  * @param index - u32
142  */
143 void
145 {
147  vlib_node_main_t *nm = &vm->node_main;
148 
149  if (index >= vec_len (nm->nodes))
150  {
151  fformat (stderr, "%d out of range, max %d\n", vec_len (nm->nodes));
152  return;
153  }
154 
155  fformat (stderr, "node runtime index %d name %s\n", index,
156  nm->nodes[index]->name);
157 }
158 
159 void
160 gdb_show_errors (int verbose)
161 {
163  unformat_input_t input;
165 
166  if (verbose == 0)
167  unformat_init_string (&input, "verbose 0", 9);
168  else if (verbose == 1)
169  unformat_init_string (&input, "verbose 1", 9);
170  else
171  {
172  fformat (stderr, "verbose not 0 or 1\n");
173  return;
174  }
175 
176  vlib_cli_show_errors.function (vm, &input, 0 /* cmd */ );
177  unformat_free (&input);
178 }
179 
180 void
181 gdb_show_session (int verbose)
182 {
184  unformat_input_t input;
186 
187  if (verbose == 0)
188  unformat_init_string (&input, "verbose 0", 9);
189  else if (verbose == 1)
190  unformat_init_string (&input, "verbose 1", 9);
191  else if (verbose == 2)
192  unformat_init_string (&input, "verbose 2", 9);
193  else
194  {
195  fformat (stderr, "verbose not 0 - 2\n");
196  return;
197  }
198 
199  vlib_cli_show_session_command.function (vm, &input, 0 /* cmd */ );
200  unformat_free (&input);
201 }
202 
203 static int
204 trace_cmp (void *a1, void *a2)
205 {
206  vlib_trace_header_t **t1 = a1;
207  vlib_trace_header_t **t2 = a2;
208  i64 dt = t1[0]->time - t2[0]->time;
209  return dt < 0 ? -1 : (dt > 0 ? +1 : 0);
210 }
211 
212 void
214 {
215  vlib_trace_main_t *tm;
216  vlib_trace_header_t **h, **traces;
217  u32 i, index = 0;
218  char *fmt;
219  u8 *s = 0;
220  u32 max;
221 
222  /* By default display only this many traces. */
223  max = 50;
224 
225  /* Get active traces from pool. */
226 
227  /* *INDENT-OFF* */
229  ({
230  fmt = "------------------- Start of thread %d %s -------------------\n";
231  s = format (s, fmt, index, vlib_worker_threads[index].name);
232 
233  tm = &this_vlib_main->trace_main;
234 
235  trace_apply_filter(this_vlib_main);
236 
237  traces = 0;
239  ({
240  vec_add1 (traces, h[0]);
241  }));
242 
243  if (vec_len (traces) == 0)
244  {
245  s = format (s, "No packets in trace buffer\n");
246  goto done;
247  }
248 
249  /* Sort them by increasing time. */
251 
252  for (i = 0; i < vec_len (traces); i++)
253  {
254  if (i == max)
255  {
256  fformat (stderr, "Limiting display to %d packets."
257  " To display more specify max.", max);
258  goto done;
259  }
260 
261  s = format (s, "Packet %d\n%U\n\n", i + 1,
262  format_vlib_trace, vlib_mains[0], traces[i]);
263  }
264 
265  done:
266  vec_free (traces);
267 
268  index++;
269  }));
270  /* *INDENT-ON* */
271 
272  fformat (stderr, "%v", s);
273  vec_free (s);
274 }
275 
276 /**
277  * @brief GDB callable function: show_gdb_command_fn - show gdb
278  *
279  * Shows list of functions for VPP available in GDB
280  *
281  * @return error - clib_error_t
282  */
283 static clib_error_t *
285  unformat_input_t * input, vlib_cli_command_t * cmd)
286 {
287  vlib_cli_output (vm, "vl(p) returns vec_len(p)");
288  vlib_cli_output (vm, "vb(b) returns vnet_buffer(b) [opaque]");
289  vlib_cli_output (vm, "vb2(b) returns vnet_buffer2(b) [opaque2]");
290  vlib_cli_output (vm, "vbi(b) returns b index");
291  vlib_cli_output (vm, "pe(p) returns pool_elts(p)");
292  vlib_cli_output (vm, "pifi(p, i) returns pool_is_free_index(p, i)");
293  vlib_cli_output (vm, "gdb_show_errors(0|1) dumps error counters");
294  vlib_cli_output (vm, "gdb_show_session dumps session counters");
295  vlib_cli_output (vm, "gdb_show_traces() dumps buffer traces");
296  vlib_cli_output (vm, "gdb_validate_buffer(b) check vlib_buffer b sanity");
297  vlib_cli_output (vm, "debug_hex_bytes (ptr, n_bytes) dumps n_bytes in hex");
298  vlib_cli_output (vm, "vlib_dump_frame_ownership() does what it says");
299  vlib_cli_output (vm, "vlib_runtime_index_to_node_name (index) prints NN");
300 
301  return 0;
302 }
303 
304 /* *INDENT-OFF* */
305 VLIB_CLI_COMMAND (show_gdb_funcs_command, static) = {
306  .path = "show gdb",
307  .short_help = "Describe functions which can be called from gdb",
308  .function = show_gdb_command_fn,
309 };
310 /* *INDENT-ON* */
311 
313 vb (void *vb_arg)
314 {
315  vlib_buffer_t *b = (vlib_buffer_t *) vb_arg;
317 
318  rv = vnet_buffer (b);
319 
320  return rv;
321 }
322 
324 vb2 (void *vb_arg)
325 {
326  vlib_buffer_t *b = (vlib_buffer_t *) vb_arg;
328 
329  rv = vnet_buffer2 (b);
330 
331  return rv;
332 }
333 
334 u32
336 {
339  u32 bi = pointer_to_uword (b) - bm->buffer_mem_start;
341  return bi;
342 }
343 
344 int
346 {
348  u32 bi = vbi (b);
349  u8 *s =
351  if (s)
352  {
353  fformat (stderr, "gdb_validate_buffer(): %v", s);
354  return -1;
355  }
356  fformat (stderr, "gdb_validate_buffer(): no error found\n");
357  return 0;
358 }
359 
360 /* Cafeteria plan, maybe you don't want these functions */
361 clib_error_t *
363 {
364  return 0;
365 }
366 
368 
369 /*
370  * fd.io coding-style-patch-verification: ON
371  *
372  * Local Variables:
373  * eval: (c-set-style "gnu")
374  * End:
375  */
void vlib_runtime_index_to_node_name(u32 index)
GDB callable function: vlib_runtime_index_to_node_name.
Definition: gdb_funcs.c:144
u32 next_frame_index
Start of next frames for this node.
Definition: node.h:484
#define vnet_buffer2(b)
Definition: buffer.h:482
#define CLIB_LOG2_CACHE_LINE_BYTES
Definition: cache.h:50
u32 vbi(vlib_buffer_t *b)
Definition: gdb_funcs.c:335
vlib_buffer_main_t * buffer_main
Definition: main.h:183
vlib_main_t * vm
Definition: in2out_ed.c:1582
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
void vlib_dump_frame_ownership(void)
GDB callable function: vlib_dump_frame_ownership.
Definition: gdb_funcs.c:102
void gdb_show_traces()
Definition: gdb_funcs.c:213
vlib_main_t ** vlib_mains
Definition: buffer.c:332
unsigned char u8
Definition: types.h:56
vnet_buffer_opaque_t * vb(void *vb_arg)
Definition: gdb_funcs.c:313
void gdb_show_session(int verbose)
Definition: gdb_funcs.c:181
vlib_trace_header_t ** trace_buffer_pool
Definition: trace.h:86
void debug_hex_bytes(u8 *s, u32 n)
GDB callable function: debug_hex_bytes - return formatted hex string.
Definition: gdb_funcs.c:92
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:513
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
vlib_node_t ** nodes
Definition: node.h:679
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
unsigned int u32
Definition: types.h:88
vlib_node_runtime_t * nodes_by_type[VLIB_N_NODE_TYPE]
Definition: node.h:689
void unformat_init_string(unformat_input_t *input, char *string, int string_len)
Definition: unformat.c:1029
vlib_worker_thread_t * vlib_worker_threads
Definition: threads.c:34
vlib_cli_command_t vlib_cli_show_errors
(constructor) VLIB_CLI_COMMAND (vlib_cli_show_errors)
Definition: error.c:285
vlib_cli_command_function_t * function
Definition: cli.h:102
format_function_t format_vlib_trace
Definition: trace.h:113
vlib_cli_command_t vlib_cli_show_session_command
(constructor) VLIB_CLI_COMMAND (vlib_cli_show_session_command)
Definition: session_cli.c:663
static clib_error_t * show_gdb_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
GDB callable function: show_gdb_command_fn - show gdb.
Definition: gdb_funcs.c:284
struct _unformat_input_t unformat_input_t
signed long i64
Definition: types.h:78
vec_header_t h
Definition: buffer.c:322
u32 node_index
Node index.
Definition: node.h:487
#define foreach_vlib_main(body)
Definition: threads.h:242
vec_header_t * pvh(void *p)
GDB callable function: pvh - Return vector header of vector.
Definition: gdb_funcs.c:49
word fformat(FILE *f, char *fmt,...)
Definition: format.c:462
u8 * name
Definition: node.h:263
sll srl srl sll sra u16x4 i
Definition: vector_sse42.h:317
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:380
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:299
vnet_buffer_opaque2_t * vb2(void *vb_arg)
Definition: gdb_funcs.c:324
string name[64]
Definition: ip.api:44
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:158
clib_error_t * gdb_func_init(vlib_main_t *vm)
Definition: gdb_funcs.c:362
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:696
int gdb_validate_buffer(vlib_buffer_t *b)
Definition: gdb_funcs.c:345
vlib_frame_t * frame
Definition: node.h:405
int pifi(void *p, u32 index)
GDB callable function: pifi - call pool_is_free_index - is passed index free?
Definition: gdb_funcs.c:79
vector header structure
Definition: vec_bootstrap.h:55
uword pe(void *v)
GDB callable function: pe - call pool_elts - number of elements in a pool.
Definition: gdb_funcs.c:64
static uword pointer_to_uword(const void *p)
Definition: types.h:131
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
#define VLIB_FRAME_OWNER
Definition: node.h:422
u32 vl(void *p)
GDB callable function: vl - Return vector length of vector.
Definition: gdb_funcs.c:35
static int trace_cmp(void *a1, void *a2)
Definition: gdb_funcs.c:204
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
vlib_node_main_t node_main
Definition: main.h:189
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
vlib_next_frame_t * next_frames
Definition: node.h:704
#define vec_sort_with_function(vec, f)
Sort a vector using the supplied element comparison function.
Definition: vec.h:1055
static void unformat_free(unformat_input_t *i)
Definition: format.h:163
uword buffer_mem_start
Definition: buffer.h:452
u8 * vlib_validate_buffers(vlib_main_t *vm, u32 *buffers, uword next_buffer_stride, uword n_buffers, vlib_buffer_known_state_t known_state, uword follow_buffer_next)
Definition: buffer.c:261
u32 index
Definition: flow_types.api:221
#define vnet_buffer(b)
Definition: buffer.h:417
#define vec_foreach(var, vec)
Vector iterator.
u32 node_runtime_index
Definition: node.h:408
void trace_apply_filter(vlib_main_t *vm)
Definition: trace.c:226
void gdb_show_errors(int verbose)
Definition: gdb_funcs.c:160
static uword pool_elts(void *v)
Number of active elements in a pool.
Definition: pool.h:128