diff options
Diffstat (limited to 'src/vlib/trace_funcs.h')
| -rw-r--r-- | src/vlib/trace_funcs.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/vlib/trace_funcs.h b/src/vlib/trace_funcs.h new file mode 100644 index 00000000..5280eae9 --- /dev/null +++ b/src/vlib/trace_funcs.h @@ -0,0 +1,185 @@ +/* + * Copyright (c) 2015 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/* + * trace_funcs.h: VLIB trace buffer. + * + * Copyright (c) 2008 Eliot Dresselhaus + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef included_vlib_trace_funcs_h +#define included_vlib_trace_funcs_h + +always_inline void +vlib_validate_trace (vlib_trace_main_t * tm, vlib_buffer_t * b) +{ + /* + * this assert seems right, but goes off constantly. + * disabling it appears to make the pain go away + */ + ASSERT (1 || b->flags & VLIB_BUFFER_IS_TRACED); + ASSERT (!pool_is_free_index (tm->trace_buffer_pool, b->trace_index)); +} + +always_inline void * +vlib_add_trace (vlib_main_t * vm, + vlib_node_runtime_t * r, vlib_buffer_t * b, u32 n_data_bytes) +{ + vlib_trace_main_t *tm = &vm->trace_main; + vlib_trace_header_t *h; + u32 n_data_words; + + vlib_validate_trace (tm, b); + + n_data_bytes = round_pow2 (n_data_bytes, sizeof (h[0])); + n_data_words = n_data_bytes / sizeof (h[0]); + vec_add2_aligned (tm->trace_buffer_pool[b->trace_index], h, + 1 + n_data_words, sizeof (h[0])); + + h->time = vm->cpu_time_last_node_dispatch; + h->n_data = n_data_words; + h->node_index = r->node_index; + + return h->data; +} + +always_inline vlib_trace_header_t * +vlib_trace_header_next (vlib_trace_header_t * h) +{ + return h + 1 + h->n_data; +} + +always_inline void +vlib_free_trace (vlib_main_t * vm, vlib_buffer_t * b) +{ + vlib_trace_main_t *tm = &vm->trace_main; + vlib_validate_trace (tm, b); + _vec_len (tm->trace_buffer_pool[b->trace_index]) = 0; + pool_put_index (tm->trace_buffer_pool, b->trace_index); +} + +always_inline void +vlib_trace_next_frame (vlib_main_t * vm, + vlib_node_runtime_t * r, u32 next_index) +{ + vlib_next_frame_t *nf; + nf = vlib_node_runtime_get_next_frame (vm, r, next_index); + nf->flags |= VLIB_FRAME_TRACE; +} + +void trace_apply_filter (vlib_main_t * vm); + +/* Mark buffer as traced and allocate trace buffer. */ +always_inline void +vlib_trace_buffer (vlib_main_t * vm, + vlib_node_runtime_t * r, + u32 next_index, vlib_buffer_t * b, int follow_chain) +{ + vlib_trace_main_t *tm = &vm->trace_main; + vlib_trace_header_t **h; + + /* + * Apply filter to existing traces to keep number of allocated traces low. + * Performed each time around the main loop. + */ + if (tm->last_main_loop_count != vm->main_loop_count) + { + tm->last_main_loop_count = vm->main_loop_count; + trace_apply_filter (vm); + } + + vlib_trace_next_frame (vm, r, next_index); + + pool_get (tm->trace_buffer_pool, h); + + do + { + b->flags |= VLIB_BUFFER_IS_TRACED; + b->trace_index = h - tm->trace_buffer_pool; + } + while (follow_chain && (b = vlib_get_next_buffer (vm, b))); +} + +always_inline void +vlib_buffer_copy_trace_flag (vlib_main_t * vm, vlib_buffer_t * b, + u32 bi_target) +{ + vlib_buffer_t *b_target = vlib_get_buffer (vm, bi_target); + b_target->flags |= b->flags & VLIB_BUFFER_IS_TRACED; + b_target->trace_index = b->trace_index; +} + +always_inline u32 +vlib_get_trace_count (vlib_main_t * vm, vlib_node_runtime_t * rt) +{ + vlib_trace_main_t *tm = &vm->trace_main; + vlib_trace_node_t *tn; + int n; + + if (rt->node_index >= vec_len (tm->nodes)) + return 0; + tn = tm->nodes + rt->node_index; + n = tn->limit - tn->count; + ASSERT (n >= 0); + + return n; +} + +always_inline void +vlib_set_trace_count (vlib_main_t * vm, vlib_node_runtime_t * rt, u32 count) +{ + vlib_trace_main_t *tm = &vm->trace_main; + vlib_trace_node_t *tn = vec_elt_at_index (tm->nodes, rt->node_index); + + ASSERT (count <= tn->limit); + tn->count = tn->limit - count; +} + +/* Helper function for nodes which only trace buffer data. */ +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); + +#endif /* included_vlib_trace_funcs_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |