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.
15 #ifndef included_vlib_threads_h
16 #define included_vlib_threads_h
18 #include <vlib/main.h>
19 #include <linux/sched.h>
21 extern vlib_main_t **vlib_mains;
23 void vlib_set_thread_name (char *name);
25 /* arg is actually a vlib__thread_t * */
26 typedef void (vlib_thread_function_t) (void *arg);
28 typedef struct vlib_thread_registration_
30 /* constructor generated list of thread registrations */
31 struct vlib_thread_registration_ *next;
33 /* config parameters */
36 vlib_thread_function_t *function;
40 int no_data_structure_clone;
41 u32 frame_queue_nelts;
43 /* All threads of this type run on pthreads */
47 } vlib_thread_registration_t;
50 * Frames have their cpu / vlib_main_t index in the low-order N bits
51 * Make VLIB_MAX_CPUS a power-of-two, please...
55 #define VLIB_MAX_CPUS 256
58 #if VLIB_MAX_CPUS > CLIB_MAX_MHEAPS
59 #error Please increase number of per-cpu mheaps
62 #define VLIB_CPU_MASK (VLIB_MAX_CPUS - 1) /* 0x3f, max */
63 #define VLIB_OFFSET_MASK (~VLIB_CPU_MASK)
65 #define VLIB_LOG2_THREAD_STACK_SIZE (21)
66 #define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)
70 VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME,
71 } vlib_frame_queue_msg_type_t;
75 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
81 /* 256 * 4 = 1024 bytes, even mult of cache line size */
82 u32 buffer_index[VLIB_FRAME_SIZE];
84 vlib_frame_queue_elt_t;
88 /* First cache line */
89 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
90 volatile u32 *wait_at_barrier;
91 volatile u32 *workers_at_barrier;
93 /* Second Cache Line */
94 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
97 void (*thread_function) (void *);
98 void *thread_function_arg;
100 elog_track_t elog_track;
102 vlib_thread_registration_t *registration;
104 u64 barrier_sync_count;
105 volatile u32 *node_reforks_required;
110 } vlib_worker_thread_t;
112 extern vlib_worker_thread_t *vlib_worker_threads;
117 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
122 u32 enqueue_full_events;
125 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
131 u64 vector_threshold;
133 /* dequeue hint to enqueue side */
134 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
135 volatile u64 head_hint;
137 /* read-only, constant, shared */
138 CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
139 vlib_frame_queue_elt_t *elts;
147 vlib_frame_queue_t **vlib_frame_queues;
149 /* for frame queue tracing */
150 frame_queue_trace_t *frame_queue_traces;
151 frame_queue_nelt_counter_t *frame_queue_histogram;
152 } vlib_frame_queue_main_t;
154 /* Called early, in thread 0's context */
155 clib_error_t *vlib_thread_init (vlib_main_t * vm);
157 int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
158 u32 frame_queue_index, vlib_frame_t * frame,
159 vlib_frame_queue_msg_type_t type);
162 vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm);
164 void vlib_worker_thread_node_runtime_update (void);
166 void vlib_create_worker_threads (vlib_main_t * vm, int n,
167 void (*thread_function) (void *));
169 void vlib_worker_thread_init (vlib_worker_thread_t * w);
170 u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
172 /* Check for a barrier sync request every 30ms */
173 #define BARRIER_SYNC_DELAY (0.030000)
176 /* long barrier timeout, for gdb... */
177 #define BARRIER_SYNC_TIMEOUT (600.1)
179 #define BARRIER_SYNC_TIMEOUT (1.0)
182 void vlib_worker_thread_barrier_sync (vlib_main_t * vm);
183 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
184 void vlib_worker_thread_node_refork (void);
186 static_always_inline uword
187 vlib_get_thread_index (void)
189 return __os_thread_index;
193 vlib_smp_unsafe_warning (void)
197 if (vlib_get_thread_index ())
198 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
204 VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
205 VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
208 void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);
210 #define foreach_vlib_main(body) \
212 vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
215 for (ii = 0; ii < vec_len (vlib_mains); ii++) \
217 this_vlib_main = vlib_mains[ii]; \
219 this_vlib_main->parked_at_barrier == 1); \
220 if (this_vlib_main) \
221 vec_add1 (__vlib_mains, this_vlib_main); \
224 for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
226 this_vlib_main = __vlib_mains[ii]; \
227 /* body uses this_vlib_main... */ \
230 vec_free (__vlib_mains); \
233 #define foreach_sched_policy \
234 _(SCHED_OTHER, OTHER, "other") \
235 _(SCHED_BATCH, BATCH, "batch") \
236 _(SCHED_IDLE, IDLE, "idle") \
237 _(SCHED_FIFO, FIFO, "fifo") \
238 _(SCHED_RR, RR, "rr")
242 #define _(v,f,s) SCHED_POLICY_##f = v,
250 clib_error_t *(*vlib_launch_thread_cb) (void *fp, vlib_worker_thread_t * w,
252 clib_error_t *(*vlib_thread_set_lcore_cb) (u32 thread, u16 lcore);
253 } vlib_thread_callbacks_t;
257 /* Link list of registrations, built by constructors */
258 vlib_thread_registration_t *next;
260 /* Vector of registrations, w/ non-data-structure clones at the top */
261 vlib_thread_registration_t **registrations;
263 uword *thread_registrations_by_name;
265 vlib_worker_thread_t *worker_threads;
268 * Launch all threads as pthreads,
269 * not eal_rte_launch (strict affinity) threads
273 /* Number of vlib_main / vnet_main clones */
276 /* Number of thread stacks to create */
279 /* Number of pthreads */
282 /* Number of threads */
285 /* Number of cores to skip, must match the core mask */
288 /* Thread prefix name */
291 /* main thread lcore */
294 /* Bitmap of available CPU cores */
295 uword *cpu_core_bitmap;
297 /* Bitmap of available CPU sockets (NUMA nodes) */
298 uword *cpu_socket_bitmap;
300 /* Worker handoff queues */
301 vlib_frame_queue_main_t *frame_queue_mains;
303 /* worker thread initialization barrier */
304 volatile u32 worker_thread_release;
306 /* scheduling policy */
309 /* scheduling policy priority */
313 vlib_thread_callbacks_t cb;
314 int extern_thread_mgmt;
315 } vlib_thread_main_t;
317 extern vlib_thread_main_t vlib_thread_main;
319 #include <vlib/global_funcs.h>
321 #define VLIB_REGISTER_THREAD(x,...) \
322 __VA_ARGS__ vlib_thread_registration_t x; \
323 static void __vlib_add_thread_registration_##x (void) \
324 __attribute__((__constructor__)) ; \
325 static void __vlib_add_thread_registration_##x (void) \
327 vlib_thread_main_t * tm = &vlib_thread_main; \
331 __VA_ARGS__ vlib_thread_registration_t x
336 return vlib_thread_main.n_vlib_mains - 1;
340 vlib_get_worker_thread_index (u32 worker_index)
342 return worker_index + 1;
346 vlib_get_worker_index (u32 thread_index)
348 return thread_index - 1;
352 vlib_get_current_worker_index ()
354 return vlib_get_thread_index () - 1;
358 vlib_worker_thread_barrier_check (void)
360 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
363 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
366 vm = vlib_get_main ();
367 vm->parked_at_barrier = 1;
369 while (*vlib_worker_threads->wait_at_barrier)
372 vm->parked_at_barrier = 0;
373 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);
375 if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
377 vlib_worker_thread_node_refork ();
378 clib_smp_atomic_add (vlib_worker_threads->node_reforks_required,
380 while (*vlib_worker_threads->node_reforks_required)
386 always_inline vlib_main_t *
387 vlib_get_worker_vlib_main (u32 worker_index)
390 vlib_thread_main_t *tm = &vlib_thread_main;
391 ASSERT (worker_index < tm->n_vlib_mains - 1);
392 vm = vlib_mains[worker_index + 1];
398 vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
400 CLIB_MEMORY_BARRIER ();
404 static inline vlib_frame_queue_elt_t *
405 vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
407 vlib_frame_queue_t *fq;
408 vlib_frame_queue_elt_t *elt;
409 vlib_thread_main_t *tm = &vlib_thread_main;
410 vlib_frame_queue_main_t *fqm =
411 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
414 fq = fqm->vlib_frame_queues[index];
417 new_tail = __sync_add_and_fetch (&fq->tail, 1);
419 /* Wait until a ring slot is available */
420 while (new_tail >= fq->head_hint + fq->nelts)
421 vlib_worker_thread_barrier_check ();
423 elt = fq->elts + (new_tail & (fq->nelts - 1));
425 /* this would be very bad... */
429 elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
430 elt->last_n_vectors = elt->n_vectors = 0;
435 static inline vlib_frame_queue_t *
436 is_vlib_frame_queue_congested (u32 frame_queue_index,
439 vlib_frame_queue_t **
440 handoff_queue_by_worker_index)
442 vlib_frame_queue_t *fq;
443 vlib_thread_main_t *tm = &vlib_thread_main;
444 vlib_frame_queue_main_t *fqm =
445 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
447 fq = handoff_queue_by_worker_index[index];
448 if (fq != (vlib_frame_queue_t *) (~0))
451 fq = fqm->vlib_frame_queues[index];
454 if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
456 /* a valid entry in the array will indicate the queue has reached
457 * the specified threshold and is congested
459 handoff_queue_by_worker_index[index] = fq;
460 fq->enqueue_full_events++;
467 static inline vlib_frame_queue_elt_t *
468 vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
469 u32 vlib_worker_index,
470 vlib_frame_queue_elt_t **
471 handoff_queue_elt_by_worker_index)
473 vlib_frame_queue_elt_t *elt;
475 if (handoff_queue_elt_by_worker_index[vlib_worker_index])
476 return handoff_queue_elt_by_worker_index[vlib_worker_index];
478 elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);
480 handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;
485 u8 *vlib_thread_stack_init (uword thread_index);
487 int vlib_thread_cb_register (struct vlib_main_t *vm,
488 vlib_thread_callbacks_t * cb);
490 #endif /* included_vlib_threads_h */
493 * fd.io coding-style-patch-verification: ON
496 * eval: (c-set-style "gnu")