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 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 (20)
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;
109 } vlib_worker_thread_t;
111 vlib_worker_thread_t *vlib_worker_threads;
116 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
121 u32 enqueue_full_events;
124 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
130 u64 vector_threshold;
132 /* dequeue hint to enqueue side */
133 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
134 volatile u64 head_hint;
136 /* read-only, constant, shared */
137 CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
138 vlib_frame_queue_elt_t *elts;
146 vlib_frame_queue_t **vlib_frame_queues;
148 /* for frame queue tracing */
149 frame_queue_trace_t *frame_queue_traces;
150 frame_queue_nelt_counter_t *frame_queue_histogram;
151 } vlib_frame_queue_main_t;
153 /* Called early, in thread 0's context */
154 clib_error_t *vlib_thread_init (vlib_main_t * vm);
156 vlib_worker_thread_t *vlib_alloc_thread (vlib_main_t * vm);
158 int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
159 u32 frame_queue_index, vlib_frame_t * frame,
160 vlib_frame_queue_msg_type_t type);
162 int vlib_frame_queue_dequeue (int thread_id,
163 vlib_main_t * vm, vlib_node_main_t * nm);
165 u64 dispatch_node (vlib_main_t * vm,
166 vlib_node_runtime_t * node,
167 vlib_node_type_t type,
168 vlib_node_state_t dispatch_state,
169 vlib_frame_t * frame, u64 last_time_stamp);
171 u64 dispatch_pending_node (vlib_main_t * vm,
172 vlib_pending_frame_t * p, u64 last_time_stamp);
174 void vlib_worker_thread_node_runtime_update (void);
176 void vlib_create_worker_threads (vlib_main_t * vm, int n,
177 void (*thread_function) (void *));
179 void vlib_worker_thread_init (vlib_worker_thread_t * w);
180 u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
182 /* Check for a barrier sync request every 30ms */
183 #define BARRIER_SYNC_DELAY (0.030000)
186 /* long barrier timeout, for gdb... */
187 #define BARRIER_SYNC_TIMEOUT (600.1)
189 #define BARRIER_SYNC_TIMEOUT (1.0)
192 void vlib_worker_thread_barrier_sync (vlib_main_t * vm);
193 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
196 vlib_smp_unsafe_warning (void)
200 if (os_get_cpu_number ())
201 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
207 VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
208 VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
211 void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);
214 vlib_worker_thread_barrier_check (void)
216 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
218 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
219 while (*vlib_worker_threads->wait_at_barrier)
221 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);
225 #define foreach_vlib_main(body) \
227 vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
230 if (vec_len (vlib_mains) == 0) \
231 vec_add1 (__vlib_mains, &vlib_global_main); \
234 for (ii = 0; ii < vec_len (vlib_mains); ii++) \
236 this_vlib_main = vlib_mains[ii]; \
237 if (this_vlib_main) \
238 vec_add1 (__vlib_mains, this_vlib_main); \
242 for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
244 this_vlib_main = __vlib_mains[ii]; \
245 /* body uses this_vlib_main... */ \
248 vec_free (__vlib_mains); \
251 #define foreach_sched_policy \
252 _(SCHED_OTHER, OTHER, "other") \
253 _(SCHED_BATCH, BATCH, "batch") \
254 _(SCHED_IDLE, IDLE, "idle") \
255 _(SCHED_FIFO, FIFO, "fifo") \
256 _(SCHED_RR, RR, "rr")
260 #define _(v,f,s) SCHED_POLICY_##f = v,
268 /* Link list of registrations, built by constructors */
269 vlib_thread_registration_t *next;
271 /* Vector of registrations, w/ non-data-structure clones at the top */
272 vlib_thread_registration_t **registrations;
274 uword *thread_registrations_by_name;
276 vlib_worker_thread_t *worker_threads;
279 * Launch all threads as pthreads,
280 * not eal_rte_launch (strict affinity) threads
284 /* Number of vlib_main / vnet_main clones */
287 /* Number of thread stacks to create */
290 /* Number of pthreads */
293 /* Number of DPDK eal threads */
296 /* Number of cores to skip, must match the core mask */
299 /* Thread prefix name */
302 /* main thread lcore */
305 /* Bitmap of available CPU cores */
306 uword *cpu_core_bitmap;
308 /* Bitmap of available CPU sockets (NUMA nodes) */
309 uword *cpu_socket_bitmap;
311 /* Worker handoff queues */
312 vlib_frame_queue_main_t *frame_queue_mains;
314 /* worker thread initialization barrier */
315 volatile u32 worker_thread_release;
317 /* scheduling policy */
320 /* scheduling policy priority */
323 } vlib_thread_main_t;
325 vlib_thread_main_t vlib_thread_main;
327 #define VLIB_REGISTER_THREAD(x,...) \
328 __VA_ARGS__ vlib_thread_registration_t x; \
329 static void __vlib_add_thread_registration_##x (void) \
330 __attribute__((__constructor__)) ; \
331 static void __vlib_add_thread_registration_##x (void) \
333 vlib_thread_main_t * tm = &vlib_thread_main; \
337 __VA_ARGS__ vlib_thread_registration_t x
342 return vlib_thread_main.n_vlib_mains - 1;
346 vlib_get_worker_cpu_index (u32 worker_index)
348 return worker_index + 1;
352 vlib_get_worker_index (u32 cpu_index)
354 return cpu_index - 1;
358 vlib_get_current_worker_index ()
360 return os_get_cpu_number () - 1;
363 always_inline vlib_main_t *
364 vlib_get_worker_vlib_main (u32 worker_index)
367 vlib_thread_main_t *tm = &vlib_thread_main;
368 ASSERT (worker_index < tm->n_vlib_mains - 1);
369 vm = vlib_mains[worker_index + 1];
375 vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
377 CLIB_MEMORY_BARRIER ();
381 static inline vlib_frame_queue_elt_t *
382 vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
384 vlib_frame_queue_t *fq;
385 vlib_frame_queue_elt_t *elt;
386 vlib_thread_main_t *tm = &vlib_thread_main;
387 vlib_frame_queue_main_t *fqm =
388 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
391 fq = fqm->vlib_frame_queues[index];
394 new_tail = __sync_add_and_fetch (&fq->tail, 1);
396 /* Wait until a ring slot is available */
397 while (new_tail >= fq->head_hint + fq->nelts)
398 vlib_worker_thread_barrier_check ();
400 elt = fq->elts + (new_tail & (fq->nelts - 1));
402 /* this would be very bad... */
406 elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
407 elt->last_n_vectors = elt->n_vectors = 0;
412 static inline vlib_frame_queue_t *
413 is_vlib_frame_queue_congested (u32 frame_queue_index,
416 vlib_frame_queue_t **
417 handoff_queue_by_worker_index)
419 vlib_frame_queue_t *fq;
420 vlib_thread_main_t *tm = &vlib_thread_main;
421 vlib_frame_queue_main_t *fqm =
422 vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
424 fq = handoff_queue_by_worker_index[index];
425 if (fq != (vlib_frame_queue_t *) (~0))
428 fq = fqm->vlib_frame_queues[index];
431 if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
433 /* a valid entry in the array will indicate the queue has reached
434 * the specified threshold and is congested
436 handoff_queue_by_worker_index[index] = fq;
437 fq->enqueue_full_events++;
444 static inline vlib_frame_queue_elt_t *
445 vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
446 u32 vlib_worker_index,
447 vlib_frame_queue_elt_t **
448 handoff_queue_elt_by_worker_index)
450 vlib_frame_queue_elt_t *elt;
452 if (handoff_queue_elt_by_worker_index[vlib_worker_index])
453 return handoff_queue_elt_by_worker_index[vlib_worker_index];
455 elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);
457 handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;
462 #endif /* included_vlib_threads_h */
465 * fd.io coding-style-patch-verification: ON
468 * eval: (c-set-style "gnu")