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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * trace_funcs.h: VLIB trace buffer.
18 * Copyright (c) 2008 Eliot Dresselhaus
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:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
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.
40 #ifndef included_vlib_trace_funcs_h
41 #define included_vlib_trace_funcs_h
43 extern u8 *vnet_trace_dummy;
46 vlib_validate_trace (vlib_trace_main_t * tm, vlib_buffer_t * b)
48 ASSERT (!pool_is_free_index (tm->trace_buffer_pool,
49 vlib_buffer_get_trace_index (b)));
52 void vlib_add_handoff_trace (vlib_main_t * vm, vlib_buffer_t * b);
55 vlib_add_trace (vlib_main_t * vm,
56 vlib_node_runtime_t * r, vlib_buffer_t * b, u32 n_data_bytes)
58 vlib_trace_main_t *tm = &vm->trace_main;
59 vlib_trace_header_t *h;
62 ASSERT (vnet_trace_dummy);
64 if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_IS_TRACED) == 0))
65 return vnet_trace_dummy;
67 if (PREDICT_FALSE (tm->add_trace_callback != 0))
69 return tm->add_trace_callback ((struct vlib_main_t *) vm,
70 (struct vlib_node_runtime_t *) r,
71 (struct vlib_buffer_t *) b,
74 else if (PREDICT_FALSE (tm->trace_enable == 0))
76 ASSERT (vec_len (vnet_trace_dummy) >= n_data_bytes + sizeof (*h));
77 return vnet_trace_dummy;
80 /* Are we trying to trace a handoff case? */
81 if (PREDICT_FALSE (vlib_buffer_get_trace_thread (b) != vm->thread_index))
82 vlib_add_handoff_trace (vm, b);
84 vlib_validate_trace (tm, b);
86 n_data_bytes = round_pow2 (n_data_bytes, sizeof (h[0]));
87 n_data_words = n_data_bytes / sizeof (h[0]);
88 vec_add2_aligned (tm->trace_buffer_pool[vlib_buffer_get_trace_index (b)], h,
89 1 + n_data_words, sizeof (h[0]));
91 h->time = vm->cpu_time_last_node_dispatch;
92 h->n_data = n_data_words;
93 h->node_index = r->node_index;
98 always_inline vlib_trace_header_t *
99 vlib_trace_header_next (vlib_trace_header_t * h)
101 return h + 1 + h->n_data;
105 vlib_free_trace (vlib_main_t * vm, vlib_buffer_t * b)
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);
115 vlib_trace_next_frame (vlib_main_t * vm,
116 vlib_node_runtime_t * r, u32 next_index)
118 vlib_next_frame_t *nf;
119 nf = vlib_node_runtime_get_next_frame (vm, r, next_index);
120 nf->flags |= VLIB_FRAME_TRACE;
123 void trace_apply_filter (vlib_main_t * vm);
124 int vnet_is_packet_traced (vlib_buffer_t * b,
125 u32 classify_table_index, int func);
128 /* Mark buffer as traced and allocate trace buffer. */
130 vlib_trace_buffer (vlib_main_t * vm,
131 vlib_node_runtime_t * r,
132 u32 next_index, vlib_buffer_t * b, int follow_chain)
134 vlib_trace_main_t *tm = &vm->trace_main;
135 vlib_trace_header_t **h;
137 if (PREDICT_FALSE (tm->trace_enable == 0))
140 /* Classifier filter in use? */
141 if (PREDICT_FALSE (vlib_global_main.trace_filter.trace_filter_enable))
143 /* See if we're supposed to trace this packet... */
144 if (vnet_is_packet_traced
145 (b, vlib_global_main.trace_filter.trace_classify_table_index,
146 0 /* full classify */ ) != 1)
151 * Apply filter to existing traces to keep number of allocated traces low.
152 * Performed each time around the main loop.
154 if (tm->last_main_loop_count != vm->main_loop_count)
156 tm->last_main_loop_count = vm->main_loop_count;
157 trace_apply_filter (vm);
159 if (tm->trace_buffer_callback)
160 (tm->trace_buffer_callback) ((struct vlib_main_t *) vm,
161 (struct vlib_trace_main_t *) tm);
164 vlib_trace_next_frame (vm, r, next_index);
166 pool_get (tm->trace_buffer_pool, h);
170 b->flags |= VLIB_BUFFER_IS_TRACED;
171 b->trace_handle = vlib_buffer_make_trace_handle
172 (vm->thread_index, h - tm->trace_buffer_pool);
174 while (follow_chain && (b = vlib_get_next_buffer (vm, b)));
178 vlib_buffer_copy_trace_flag (vlib_main_t * vm, vlib_buffer_t * b,
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;
187 vlib_get_trace_count (vlib_main_t * vm, vlib_node_runtime_t * rt)
189 vlib_trace_main_t *tm = &vm->trace_main;
190 vlib_trace_node_t *tn;
193 if (rt->node_index >= vec_len (tm->nodes))
195 tn = tm->nodes + rt->node_index;
196 n = tn->limit - tn->count;
203 vlib_set_trace_count (vlib_main_t * vm, vlib_node_runtime_t * rt, u32 count)
205 vlib_trace_main_t *tm = &vm->trace_main;
206 vlib_trace_node_t *tn = vec_elt_at_index (tm->nodes, rt->node_index);
208 ASSERT (count <= tn->limit);
209 tn->count = tn->limit - count;
212 /* Helper function for nodes which only trace buffer data. */
214 vlib_trace_frame_buffers_only (vlib_main_t * vm,
215 vlib_node_runtime_t * node,
218 uword next_buffer_stride,
219 uword n_buffer_data_bytes_in_trace);
221 #endif /* included_vlib_trace_funcs_h */
224 * fd.io coding-style-patch-verification: ON
227 * eval: (c-set-style "gnu")