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 * main.h: VLIB main data structure
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_main_h
41 #define included_vlib_main_h
43 #include <vppinfra/elog.h>
44 #include <vppinfra/format.h>
45 #include <vppinfra/longjmp.h>
46 #include <vppinfra/pool.h>
47 #include <vppinfra/random_buffer.h>
48 #include <vppinfra/time.h>
53 /* By default turn off node/error event logging.
54 Override with -DVLIB_ELOG_MAIN_LOOP */
55 #ifndef VLIB_ELOG_MAIN_LOOP
56 #define VLIB_ELOG_MAIN_LOOP 0
59 typedef struct vlib_main_t
61 /* Instruction level timing state. */
62 clib_time_t clib_time;
64 /* Time stamp of last node dispatch. */
65 u64 cpu_time_last_node_dispatch;
67 /* Time stamp when main loop was entered (time 0). */
68 u64 cpu_time_main_loop_start;
70 /* Incremented once for each main loop. */
73 /* Count of vectors processed this main loop. */
74 u32 main_loop_vectors_processed;
75 u32 main_loop_nodes_processed;
77 /* Circular buffer of input node vector counts.
78 Indexed by low bits of
79 (main_loop_count >> VLIB_LOG2_INPUT_VECTORS_PER_MAIN_LOOP). */
80 u32 vector_counts_per_main_loop[2];
81 u32 node_counts_per_main_loop[2];
83 /* Every so often we switch to the next counter. */
84 #define VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE 7
86 /* Jump target to exit main loop with given code. */
87 u32 main_loop_exit_set;
88 /* Set e.g. in the SIGTERM signal handler, checked in a safe place... */
89 volatile u32 main_loop_exit_now;
90 clib_longjmp_t main_loop_exit;
91 #define VLIB_MAIN_LOOP_EXIT_NONE 0
92 #define VLIB_MAIN_LOOP_EXIT_PANIC 1
94 #define VLIB_MAIN_LOOP_EXIT_CLI 2
96 /* Error marker to use when exiting main loop. */
97 clib_error_t *main_loop_error;
99 /* Name for e.g. syslog. */
102 /* Start and size of CLIB heap. */
106 vlib_buffer_main_t *buffer_main;
108 /* Allocate/free buffer memory for DMA transfers, descriptor rings, etc.
109 buffer memory is guaranteed to be cache-aligned. */
111 clib_error_t *(*os_physmem_region_alloc) (struct vlib_main_t * vm,
112 char *name, u32 size,
113 u8 numa_node, u32 flags,
114 vlib_physmem_region_index_t *
117 void (*os_physmem_region_free) (struct vlib_main_t * vm,
118 vlib_physmem_region_index_t idx);
120 void *(*os_physmem_alloc_aligned) (struct vlib_main_t * vm,
121 vlib_physmem_region_index_t idx,
122 uword n_bytes, uword alignment);
123 void (*os_physmem_free) (struct vlib_main_t * vm,
124 vlib_physmem_region_index_t idx, void *x);
126 /* Node graph main structure. */
127 vlib_node_main_t node_main;
129 /* Command line interface. */
130 vlib_cli_main_t cli_main;
132 /* Packet trace buffer. */
133 vlib_trace_main_t trace_main;
135 /* Error handling. */
136 vlib_error_main_t error_main;
138 /* Punt packets to underlying operating system for when fast switching
139 code does not know what to do. */
140 void (*os_punt_frame) (struct vlib_main_t * vm,
141 struct vlib_node_runtime_t * node,
142 vlib_frame_t * frame);
144 /* Multicast distribution. Set to zero for MC disabled. */
147 /* Stream index to use for distribution when MC is enabled. */
150 vlib_one_time_waiting_process_t *procs_waiting_for_mc_stream_join;
153 elog_main_t elog_main;
155 /* Node call and return event types. */
156 elog_event_type_t *node_call_elog_event_types;
157 elog_event_type_t *node_return_elog_event_types;
159 elog_event_type_t *error_elog_event_types;
161 /* Seed for random number generator. */
164 /* Buffer of random data for various uses. */
165 clib_random_buffer_t random_buffer;
167 /* Hash table to record which init functions have been called. */
168 uword *init_functions_called;
170 /* to compare with node runtime */
173 void **mbuf_alloc_list;
175 /* List of init functions to call, setup by constructors */
176 _vlib_init_function_list_elt_t *init_function_registrations;
177 _vlib_init_function_list_elt_t *worker_init_function_registrations;
178 _vlib_init_function_list_elt_t *main_loop_enter_function_registrations;
179 _vlib_init_function_list_elt_t *main_loop_exit_function_registrations;
180 _vlib_init_function_list_elt_t *api_init_function_registrations;
181 vlib_config_function_runtime_t *config_function_registrations;
182 mc_serialize_msg_t *mc_msg_registrations; /* mc_main is a pointer... */
184 /* control-plane API queue signal pending, length indication */
185 volatile u32 queue_signal_pending;
186 volatile u32 api_queue_nonempty;
187 void (*queue_signal_callback) (struct vlib_main_t *);
191 volatile int parked_at_barrier;
193 /* Attempt to do a post-mortem elog dump */
194 int elog_post_mortem_dump;
197 * Need to call vlib_worker_thread_node_runtime_update before
198 * releasing worker thread barrier. Only valid in vlib_global_main.
200 int need_vlib_worker_thread_node_runtime_update;
203 * Barrier epoch - Set to current time, each time barrier_sync or
204 * barrier_release is called with zero recursion.
208 /* Earliest barrier can be closed again */
209 f64 barrier_no_close_before;
211 /* Vector of pending RPC requests */
212 uword *pending_rpc_requests;
216 /* Global main structure. */
217 extern vlib_main_t vlib_global_main;
219 void vlib_worker_loop (vlib_main_t * vm);
222 vlib_time_now (vlib_main_t * vm)
224 return clib_time_now (&vm->clib_time);
228 vlib_time_now_ticks (vlib_main_t * vm, u64 n)
230 return clib_time_now_internal (&vm->clib_time, n);
233 /* Busy wait for specified time. */
235 vlib_time_wait (vlib_main_t * vm, f64 wait)
237 f64 t = vlib_time_now (vm);
238 f64 limit = t + wait;
240 t = vlib_time_now (vm);
243 /* Time a piece of code. */
244 #define vlib_time_code(vm,body) \
247 _t[0] = vlib_time_now (vm); \
248 do { body; } while (0); \
249 _t[1] = vlib_time_now (vm); \
250 clib_warning ("%.7e", _t[1] - _t[0]); \
253 #define vlib_wait_with_timeout(vm,suspend_time,timeout_time,test) \
255 uword __vlib_wait_with_timeout = 0; \
256 f64 __vlib_wait_time = 0; \
257 while (! (__vlib_wait_with_timeout = (test)) \
258 && __vlib_wait_time < (timeout_time)) \
260 vlib_process_suspend (vm, suspend_time); \
261 __vlib_wait_time += suspend_time; \
263 __vlib_wait_with_timeout; \
267 vlib_panic_with_error (vlib_main_t * vm, clib_error_t * error)
269 vm->main_loop_error = error;
270 clib_longjmp (&vm->main_loop_exit, VLIB_MAIN_LOOP_EXIT_PANIC);
273 #define vlib_panic_with_msg(vm,args...) \
274 vlib_panic_with_error (vm, clib_error_return (0, args))
277 vlib_panic (vlib_main_t * vm)
279 vlib_panic_with_error (vm, 0);
283 vlib_vector_input_stats_index (vlib_main_t * vm, word delta)
286 i = vm->main_loop_count >> VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE;
287 ASSERT (is_pow2 (ARRAY_LEN (vm->vector_counts_per_main_loop)));
288 return (i + delta) & (ARRAY_LEN (vm->vector_counts_per_main_loop) - 1);
291 /* Estimate input rate based on previous
292 2^VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE
295 vlib_last_vectors_per_main_loop (vlib_main_t * vm)
297 u32 i = vlib_vector_input_stats_index (vm, -1);
298 u32 n = vm->vector_counts_per_main_loop[i];
299 return n >> VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE;
302 /* Total ave vector count per iteration of main loop. */
304 vlib_last_vectors_per_main_loop_as_f64 (vlib_main_t * vm)
306 u32 i = vlib_vector_input_stats_index (vm, -1);
307 u32 v = vm->vector_counts_per_main_loop[i];
308 return (f64) v / (f64) (1 << VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE);
311 /* Total ave vectors/node count per iteration of main loop. */
313 vlib_last_vector_length_per_node (vlib_main_t * vm)
315 u32 i = vlib_vector_input_stats_index (vm, -1);
316 u32 v = vm->vector_counts_per_main_loop[i];
317 u32 n = vm->node_counts_per_main_loop[i];
318 return n == 0 ? 0 : (f64) v / (f64) n;
324 vlib_increment_main_loop_counter (vlib_main_t * vm)
326 u32 i, c, n, v, is_wrap;
328 c = vm->main_loop_count++;
330 is_wrap = (c & pow2_mask (VLIB_LOG2_MAIN_LOOPS_PER_STATS_UPDATE)) == 0;
335 i = vlib_vector_input_stats_index (vm, /* delta */ is_wrap);
337 v = is_wrap ? 0 : vm->vector_counts_per_main_loop[i];
338 n = is_wrap ? 0 : vm->node_counts_per_main_loop[i];
340 v += vm->main_loop_vectors_processed;
341 n += vm->main_loop_nodes_processed;
342 vm->main_loop_vectors_processed = 0;
343 vm->main_loop_nodes_processed = 0;
344 vm->vector_counts_per_main_loop[i] = v;
345 vm->node_counts_per_main_loop[i] = n;
347 if (PREDICT_FALSE (vm->main_loop_exit_now))
348 clib_longjmp (&vm->main_loop_exit, VLIB_MAIN_LOOP_EXIT_CLI);
351 always_inline void vlib_set_queue_signal_callback
352 (vlib_main_t * vm, void (*fp) (vlib_main_t *))
354 vm->queue_signal_callback = fp;
358 int vlib_main (vlib_main_t * vm, unformat_input_t * input);
360 /* Thread stacks, for os_get_thread_index */
361 extern u8 **vlib_thread_stacks;
363 /* Number of thread stacks that the application needs */
364 u32 vlib_app_num_thread_stacks_needed (void) __attribute__ ((weak));
366 extern void vlib_node_sync_stats (vlib_main_t * vm, vlib_node_t * n);
368 #endif /* included_vlib_main_h */
371 * fd.io coding-style-patch-verification: ON
374 * eval: (c-set-style "gnu")