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Vector Packet Processing
trace_funcs.h
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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  * trace_funcs.h: VLIB trace buffer.
17  *
18  * Copyright (c) 2008 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 #ifndef included_vlib_trace_funcs_h
41 #define included_vlib_trace_funcs_h
42 
43 extern u8 *vnet_trace_dummy;
44 
45 always_inline void
47 {
50 }
51 
53 
54 always_inline void *
56  vlib_node_runtime_t * r, vlib_buffer_t * b, u32 n_data_bytes)
57 {
58  vlib_trace_main_t *tm = &vm->trace_main;
60  u32 n_data_words;
61 
63 
64  if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_IS_TRACED) == 0))
65  return vnet_trace_dummy;
66 
67  if (PREDICT_FALSE (tm->add_trace_callback != 0))
68  {
69  return tm->add_trace_callback ((struct vlib_main_t *) vm,
70  (struct vlib_node_runtime_t *) r,
71  (struct vlib_buffer_t *) b,
72  n_data_bytes);
73  }
74  else if (PREDICT_FALSE (tm->trace_enable == 0))
75  {
76  ASSERT (vec_len (vnet_trace_dummy) >= n_data_bytes + sizeof (*h));
77  return vnet_trace_dummy;
78  }
79 
80  /* Are we trying to trace a handoff case? */
82  vlib_add_handoff_trace (vm, b);
83 
84  vlib_validate_trace (tm, b);
85 
86  n_data_bytes = round_pow2 (n_data_bytes, sizeof (h[0]));
87  n_data_words = n_data_bytes / sizeof (h[0]);
89  1 + n_data_words, sizeof (h[0]));
90 
92  h->n_data = n_data_words;
93  h->node_index = r->node_index;
94 
95  return h->data;
96 }
97 
100 {
101  return h + 1 + h->n_data;
102 }
103 
104 always_inline void
106 {
107  vlib_trace_main_t *tm = &vm->trace_main;
108  u32 trace_index = vlib_buffer_get_trace_index (b);
109  vlib_validate_trace (tm, b);
110  _vec_len (tm->trace_buffer_pool[trace_index]) = 0;
111  pool_put_index (tm->trace_buffer_pool, trace_index);
112 }
113 
114 always_inline void
116  vlib_node_runtime_t * r, u32 next_index)
117 {
118  vlib_next_frame_t *nf;
119  nf = vlib_node_runtime_get_next_frame (vm, r, next_index);
120  nf->flags |= VLIB_FRAME_TRACE;
121 }
122 
123 void trace_apply_filter (vlib_main_t * vm);
125  u32 classify_table_index, int func);
126 
127 
128 /* Mark buffer as traced and allocate trace buffer. */
129 always_inline void
132  u32 next_index, vlib_buffer_t * b, int follow_chain)
133 {
134  vlib_trace_main_t *tm = &vm->trace_main;
136 
137  if (PREDICT_FALSE (tm->trace_enable == 0))
138  return;
139 
140  /* Classifier filter in use? */
142  {
143  /* See if we're supposed to trace this packet... */
146  0 /* full classify */ ) != 1)
147  return;
148  }
149 
150  /*
151  * Apply filter to existing traces to keep number of allocated traces low.
152  * Performed each time around the main loop.
153  */
154  if (tm->last_main_loop_count != vm->main_loop_count)
155  {
157  trace_apply_filter (vm);
158 
159  if (tm->trace_buffer_callback)
160  (tm->trace_buffer_callback) ((struct vlib_main_t *) vm,
161  (struct vlib_trace_main_t *) tm);
162  }
163 
164  vlib_trace_next_frame (vm, r, next_index);
165 
166  pool_get (tm->trace_buffer_pool, h);
167 
168  do
169  {
170  b->flags |= VLIB_BUFFER_IS_TRACED;
172  (vm->thread_index, h - tm->trace_buffer_pool);
173  }
174  while (follow_chain && (b = vlib_get_next_buffer (vm, b)));
175 }
176 
177 always_inline void
179  u32 bi_target)
180 {
181  vlib_buffer_t *b_target = vlib_get_buffer (vm, bi_target);
182  b_target->flags |= b->flags & VLIB_BUFFER_IS_TRACED;
183  b_target->trace_handle = b->trace_handle;
184 }
185 
188 {
189  vlib_trace_main_t *tm = &vm->trace_main;
190  vlib_trace_node_t *tn;
191  int n;
192 
193  if (rt->node_index >= vec_len (tm->nodes))
194  return 0;
195  tn = tm->nodes + rt->node_index;
196  n = tn->limit - tn->count;
197  ASSERT (n >= 0);
198 
199  return n;
200 }
201 
202 always_inline void
204 {
205  vlib_trace_main_t *tm = &vm->trace_main;
207 
208  ASSERT (count <= tn->limit);
209  tn->count = tn->limit - count;
210 }
211 
212 /* Helper function for nodes which only trace buffer data. */
213 void
215  vlib_node_runtime_t * node,
216  u32 * buffers,
217  uword n_buffers,
218  uword next_buffer_stride,
219  uword n_buffer_data_bytes_in_trace);
220 
221 #endif /* included_vlib_trace_funcs_h */
222 
223 /*
224  * fd.io coding-style-patch-verification: ON
225  *
226  * Local Variables:
227  * eval: (c-set-style "gnu")
228  * End:
229  */
volatile u32 main_loop_count
Definition: main.h:99
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
u8 count
Definition: dhcp.api:208
vlib_main_t vlib_global_main
Definition: main.c:1999
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
static u32 vlib_buffer_make_trace_handle(u32 thread, u32 pool_index)
Construct a trace handle from thread and pool index.
Definition: buffer.h:362
static u32 vlib_get_trace_count(vlib_main_t *vm, vlib_node_runtime_t *rt)
Definition: trace_funcs.h:187
static u32 vlib_buffer_get_trace_index(vlib_buffer_t *b)
Extract the trace (pool) index from a trace handle.
Definition: buffer.h:388
vlib_trace_node_t * nodes
Definition: trace.h:100
static vlib_trace_header_t * vlib_trace_header_next(vlib_trace_header_t *h)
Definition: trace_funcs.h:99
#define vec_add2_aligned(V, P, N, A)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:640
u32 thread_index
Definition: main.h:218
vlib_trace_buffer_callback_t * trace_buffer_callback
Definition: trace.h:106
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:252
unsigned char u8
Definition: types.h:56
static void vlib_trace_buffer(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, vlib_buffer_t *b, int follow_chain)
Definition: trace_funcs.h:130
vlib_trace_header_t ** trace_buffer_pool
Definition: trace.h:86
u32 last_main_loop_count
Definition: trace.h:88
u32 trace_enable
Definition: trace.h:97
u8 * vnet_trace_dummy
Definition: trace.c:43
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
static void vlib_trace_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index)
Definition: trace_funcs.h:115
unsigned int u32
Definition: types.h:88
u8 trace_filter_enable
Definition: main.h:78
static vlib_next_frame_t * vlib_node_runtime_get_next_frame(vlib_main_t *vm, vlib_node_runtime_t *n, u32 next_index)
Definition: node_funcs.h:264
static void vlib_free_trace(vlib_main_t *vm, vlib_buffer_t *b)
Definition: trace_funcs.h:105
void vlib_add_handoff_trace(vlib_main_t *vm, vlib_buffer_t *b)
vec_header_t h
Definition: buffer.c:322
u32 trace_handle
Specifies trace buffer handle if VLIB_PACKET_IS_TRACED flag is set.
Definition: buffer.h:163
#define PREDICT_FALSE(x)
Definition: clib.h:118
#define always_inline
Definition: ipsec.h:28
vlib_add_trace_callback_t * add_trace_callback
Definition: trace.h:109
u32 node_index
Node index.
Definition: node.h:498
vlib_main_t * vm
Definition: in2out_ed.c:1599
u32 classify_table_index
Definition: fib_types.api:68
int vnet_is_packet_traced(vlib_buffer_t *b, u32 classify_table_index, int func)
static void vlib_buffer_copy_trace_flag(vlib_main_t *vm, vlib_buffer_t *b, u32 bi_target)
Definition: trace_funcs.h:178
void trace_apply_filter(vlib_main_t *vm)
Definition: trace.c:226
static u32 vlib_buffer_get_trace_thread(vlib_buffer_t *b)
Extract the thread id from a trace handle.
Definition: buffer.h:376
static vlib_buffer_t * vlib_get_next_buffer(vlib_main_t *vm, vlib_buffer_t *b)
Get next buffer in buffer linklist, or zero for end of list.
Definition: buffer_funcs.h:386
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:299
static uword round_pow2(uword x, uword pow2)
Definition: clib.h:256
#define pool_put_index(p, i)
Free pool element with given index.
Definition: pool.h:331
#define ASSERT(truth)
vlib_trace_main_t trace_main
Definition: main.h:164
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
#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
#define VLIB_FRAME_TRACE
Definition: node.h:437
vlib_trace_filter_t trace_filter
Definition: main.h:176
static void vlib_validate_trace(vlib_trace_main_t *tm, vlib_buffer_t *b)
Definition: trace_funcs.h:46
static void vlib_set_trace_count(vlib_main_t *vm, vlib_node_runtime_t *rt, u32 count)
Definition: trace_funcs.h:203
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
u32 trace_classify_table_index
Definition: main.h:79
u64 cpu_time_last_node_dispatch
Definition: main.h:93