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;
80 /* 256 * 4 = 1024 bytes, even mult of cache line size */
81 u32 buffer_index[VLIB_FRAME_SIZE];
83 /* Pad to a cache line boundary */
84 u8 pad[CLIB_CACHE_LINE_BYTES - 4 * sizeof (u32)];
86 vlib_frame_queue_elt_t;
90 /* First cache line */
91 volatile u32 *wait_at_barrier;
92 volatile u32 *workers_at_barrier;
93 u8 pad0[CLIB_CACHE_LINE_BYTES - (2 * sizeof (u32 *))];
95 /* Second Cache Line */
98 void (*thread_function) (void *);
99 void *thread_function_arg;
101 elog_track_t elog_track;
103 vlib_thread_registration_t *registration;
105 u64 barrier_sync_count;
110 } vlib_worker_thread_t;
112 vlib_worker_thread_t *vlib_worker_threads;
121 u32 enqueue_full_events;
122 u32 enqueue_efd_discards;
123 u8 pad2[CLIB_CACHE_LINE_BYTES - (2 * sizeof (u32)) - (4 * sizeof (u64))];
131 u64 vector_threshold;
132 u8 pad4[CLIB_CACHE_LINE_BYTES - (6 * sizeof (u64))];
134 /* dequeue hint to enqueue side */
135 volatile u64 head_hint;
136 u8 pad5[CLIB_CACHE_LINE_BYTES - sizeof (u64)];
138 /* read-only, constant, shared */
139 vlib_frame_queue_elt_t *elts;
144 vlib_frame_queue_t **vlib_frame_queues;
146 /* Called early, in thread 0's context */
147 clib_error_t *vlib_thread_init (vlib_main_t * vm);
149 vlib_worker_thread_t *vlib_alloc_thread (vlib_main_t * vm);
151 int vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
152 u32 frame_queue_index, vlib_frame_t * frame,
153 vlib_frame_queue_msg_type_t type);
155 int vlib_frame_queue_dequeue (int thread_id,
156 vlib_main_t * vm, vlib_node_main_t * nm);
158 u64 dispatch_node (vlib_main_t * vm,
159 vlib_node_runtime_t * node,
160 vlib_node_type_t type,
161 vlib_node_state_t dispatch_state,
162 vlib_frame_t * frame, u64 last_time_stamp);
164 u64 dispatch_pending_node (vlib_main_t * vm,
165 vlib_pending_frame_t * p, u64 last_time_stamp);
167 void vlib_worker_thread_node_runtime_update (void);
169 void vlib_create_worker_threads (vlib_main_t * vm, int n,
170 void (*thread_function) (void *));
172 void vlib_worker_thread_init (vlib_worker_thread_t * w);
174 /* Check for a barrier sync request every 30ms */
175 #define BARRIER_SYNC_DELAY (0.030000)
178 /* long barrier timeout, for gdb... */
179 #define BARRIER_SYNC_TIMEOUT (600.1)
181 #define BARRIER_SYNC_TIMEOUT (1.0)
184 void vlib_worker_thread_barrier_sync (vlib_main_t * vm);
185 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
188 vlib_smp_unsafe_warning (void)
192 if (os_get_cpu_number ())
193 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
199 VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
200 VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
203 void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);
206 vlib_worker_thread_barrier_check (void)
208 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
210 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
211 while (*vlib_worker_threads->wait_at_barrier)
213 clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);
217 #define foreach_vlib_main(body) \
219 vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
222 if (vec_len (vlib_mains) == 0) \
223 vec_add1 (__vlib_mains, &vlib_global_main); \
226 for (ii = 0; ii < vec_len (vlib_mains); ii++) \
228 this_vlib_main = vlib_mains[ii]; \
229 if (this_vlib_main) \
230 vec_add1 (__vlib_mains, this_vlib_main); \
234 for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
236 this_vlib_main = __vlib_mains[ii]; \
237 /* body uses this_vlib_main... */ \
240 vec_free (__vlib_mains); \
244 /* Early-Fast-Discard (EFD) */
245 #define VLIB_EFD_DISABLED 0
246 #define VLIB_EFD_DISCARD_ENABLED (1 << 0)
247 #define VLIB_EFD_MONITOR_ENABLED (1 << 1)
249 #define VLIB_EFD_DEF_WORKER_HI_THRESH_PCT 90
251 /* EFD worker thread settings */
252 typedef struct vlib_efd_t
262 #define foreach_sched_policy \
263 _(SCHED_OTHER, OTHER, "other") \
264 _(SCHED_BATCH, BATCH, "batch") \
265 _(SCHED_IDLE, IDLE, "idle") \
266 _(SCHED_FIFO, FIFO, "fifo") \
267 _(SCHED_RR, RR, "rr")
271 #define _(v,f,s) SCHED_POLICY_##f = v,
279 /* Link list of registrations, built by constructors */
280 vlib_thread_registration_t *next;
282 /* Vector of registrations, w/ non-data-structure clones at the top */
283 vlib_thread_registration_t **registrations;
285 uword *thread_registrations_by_name;
287 vlib_worker_thread_t *worker_threads;
290 * Launch all threads as pthreads,
291 * not eal_rte_launch (strict affinity) threads
295 /* Number of vlib_main / vnet_main clones */
298 /* Number of thread stacks to create */
301 /* Number of pthreads */
304 /* Number of DPDK eal threads */
307 /* Number of cores to skip, must match the core mask */
310 /* Thread prefix name */
313 /* main thread lcore */
316 /* Bitmap of available CPU cores */
317 uword *cpu_core_bitmap;
319 /* Bitmap of available CPU sockets (NUMA nodes) */
320 uword *cpu_socket_bitmap;
324 /* handoff node index */
325 u32 handoff_dispatch_node_index;
327 /* for frame queue tracing */
328 frame_queue_trace_t *frame_queue_traces;
329 frame_queue_nelt_counter_t *frame_queue_histogram;
331 /* worker thread initialization barrier */
332 volatile u32 worker_thread_release;
334 /* scheduling policy */
337 /* scheduling policy priority */
340 } vlib_thread_main_t;
342 vlib_thread_main_t vlib_thread_main;
344 #define VLIB_REGISTER_THREAD(x,...) \
345 __VA_ARGS__ vlib_thread_registration_t x; \
346 static void __vlib_add_thread_registration_##x (void) \
347 __attribute__((__constructor__)) ; \
348 static void __vlib_add_thread_registration_##x (void) \
350 vlib_thread_main_t * tm = &vlib_thread_main; \
354 __VA_ARGS__ vlib_thread_registration_t x
356 #endif /* included_vlib_threads_h */
359 * fd.io coding-style-patch-verification: ON
362 * eval: (c-set-style "gnu")