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/*
 * 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.
 */
/*
  Copyright (c) 2005 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_clib_cache_h
#define included_clib_cache_h

#include <vppinfra/error_bootstrap.h>

/* Default cache line size of 64 bytes. */
#ifndef CLIB_LOG2_CACHE_LINE_BYTES
#define CLIB_LOG2_CACHE_LINE_BYTES 6
#endif

/* How much data prefetch instruction prefetches */
#ifndef CLIB_LOG2_CACHE_PREFETCH_BYTES
#define CLIB_LOG2_CACHE_PREFETCH_BYTES CLIB_LOG2_CACHE_LINE_BYTES
#endif

/* Default cache line fill buffers. */
#ifndef CLIB_N_PREFETCHES
#define CLIB_N_PREFETCHES 16
#endif

#define CLIB_CACHE_LINE_BYTES	  (1 << CLIB_LOG2_CACHE_LINE_BYTES)
#define CLIB_CACHE_PREFETCH_BYTES (1 << CLIB_LOG2_CACHE_PREFETCH_BYTES)
#define CLIB_CACHE_LINE_ALIGN_MARK(mark)                                      \
  u8 mark[0] __attribute__ ((aligned (CLIB_CACHE_LINE_BYTES)))
#define CLIB_CACHE_LINE_ROUND(x)                                              \
  ((x + CLIB_CACHE_LINE_BYTES - 1) & ~(CLIB_CACHE_LINE_BYTES - 1))

/* Read/write arguments to __builtin_prefetch. */
#define CLIB_PREFETCH_READ 0
#define CLIB_PREFETCH_LOAD 0	/* alias for read */
#define CLIB_PREFETCH_WRITE 1
#define CLIB_PREFETCH_STORE 1	/* alias for write */

#define _CLIB_PREFETCH(n, size, type)                                         \
  if ((size) > (n) *CLIB_CACHE_PREFETCH_BYTES)                                \
    __builtin_prefetch (_addr + (n) *CLIB_CACHE_PREFETCH_BYTES,               \
			CLIB_PREFETCH_##type, /* locality */ 3);

#define CLIB_PREFETCH(addr, size, type)                                       \
  do                                                                          \
    {                                                                         \
      void *_addr = (addr);                                                   \
                                                                              \
      ASSERT ((size) <= 4 * CLIB_CACHE_PREFETCH_BYTES);                       \
      _CLIB_PREFETCH (0, size, type);                                         \
      _CLIB_PREFETCH (1, size, type);                                         \
      _CLIB_PREFETCH (2, size, type);                                         \
      _CLIB_PREFETCH (3, size, type);                                         \
    }                                                                         \
  while (0)

#undef _

static_always_inline void
clib_prefetch_load (void *p)
{
  __builtin_prefetch (p, /* rw */ 0, /* locality */ 3);
}

static_always_inline void
clib_prefetch_store (void *p)
{
  __builtin_prefetch (p, /* rw */ 1, /* locality */ 3);
}

#endif /* included_clib_cache_h */


/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
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/*
 * 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.
 */
#define _GNU_SOURCE

#include <signal.h>
#include <math.h>
#include <vppinfra/format.h>
#include <vppinfra/time_range.h>
#include <vppinfra/linux/sysfs.h>
#include <vlib/vlib.h>

#include <vlib/threads.h>

#include <vlib/stat_weak_inlines.h>

u32
vl (void *p)
{
  return vec_len (p);
}

vlib_worker_thread_t *vlib_worker_threads;
vlib_thread_main_t vlib_thread_main;

/*
 * Barrier tracing can be enabled on a normal build to collect information
 * on barrier use, including timings and call stacks.  Deliberately not
 * keyed off CLIB_DEBUG, because that can add significant overhead which
 * imapacts observed timings.
 */

static inline void
barrier_trace_sync (f64 t_entry, f64 t_open, f64 t_closed)
{
  if (!vlib_worker_threads->barrier_elog_enabled)
    return;

    /* *INDENT-OFF* */
    ELOG_TYPE_DECLARE (e) =
      {
        .format = "bar-trace-%s-#%d",
        .format_args = "T4i4",
      };
    /* *INDENT-ON* */
  struct
  {
    u32 caller, count, t_entry, t_open, t_closed;
  } *ed = 0;

  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
  ed->count = (int) vlib_worker_threads[0].barrier_sync_count;
  ed->caller = elog_string (&vlib_global_main.elog_main,
			    (char *) vlib_worker_threads[0].barrier_caller);
  ed->t_entry = (int) (1000000.0 * t_entry);
  ed->t_open = (int) (1000000.0 * t_open);
  ed->t_closed = (int) (1000000.0 * t_closed);
}

static inline void
barrier_trace_sync_rec (f64 t_entry)
{
  if (!vlib_worker_threads->barrier_elog_enabled)
    return;

    /* *INDENT-OFF* */
    ELOG_TYPE_DECLARE (e) =
      {
        .format = "bar-syncrec-%s-#%d",
        .format_args = "T4i4",
      };
    /* *INDENT-ON* */
  struct
  {
    u32 caller, depth;
  } *ed = 0;

  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
  ed->depth = (int) vlib_worker_threads[0].recursion_level - 1;
  ed->caller = elog_string (&vlib_global_main.elog_main,
			    (char *) vlib_worker_threads[0].barrier_caller);
}

static inline void
barrier_trace_release_rec (f64 t_entry)
{
  if (!vlib_worker_threads->barrier_elog_enabled)
    return;

    /* *INDENT-OFF* */
    ELOG_TYPE_DECLARE (e) =
      {
        .format = "bar-relrrec-#%d",
        .format_args = "i4",
      };
    /* *INDENT-ON* */
  struct
  {
    u32 depth;
  } *ed = 0;

  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
  ed->depth = (int) vlib_worker_threads[0].recursion_level;
}

static inline void
barrier_trace_release (f64 t_entry, f64 t_closed_total, f64 t_update_main)
{
  if (!vlib_worker_threads->barrier_elog_enabled)
    return;

    /* *INDENT-OFF* */
    ELOG_TYPE_DECLARE (e) =
      {
        .format = "bar-rel-#%d-e%d-u%d-t%d",
        .format_args = "i4i4i4i4",
      };
    /* *INDENT-ON* */
  struct
  {
    u32 count, t_entry, t_update_main, t_closed_total;
  } *ed = 0;

  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
  ed->t_entry = (int) (1000000.0 * t_entry);
  ed->t_update_main = (int) (1000000.0 * t_update_main);
  ed->t_closed_total = (int) (1000000.0 * t_closed_total);
  ed->count = (int) vlib_worker_threads[0].barrier_sync_count;

  /* Reset context for next trace */
  vlib_worker_threads[0].barrier_context = NULL;
}

uword
os_get_nthreads (void)
{
  return vec_len (vlib_thread_stacks);
}

void
vlib_set_thread_name (char *name)
{
  int pthread_setname_np (pthread_t __target_thread, const char *__name);
  int rv;
  pthread_t thread = pthread_self ();

  if (thread)
    {
      rv = pthread_setname_np (thread, name);
      if (rv)
	clib_warning ("pthread_setname_np returned %d", rv);
    }
}

static int
sort_registrations_by_no_clone (void *a0, void *a1)
{
  vlib_thread_registration_t **tr0 = a0;
  vlib_thread_registration_t **tr1 = a1;

  return ((i32) ((*tr0)->no_data_structure_clone)
	  - ((i32) ((*tr1)->no_data_structure_clone)));
}

static uword *
clib_sysfs_list_to_bitmap (char *filename)
{
  FILE *fp;
  uword *r = 0;

  fp = fopen (filename, "r");

  if (fp != NULL)
    {
      u8 *buffer = 0;
      vec_validate (buffer, 256 - 1);
      if (fgets ((char *) buffer, 256, fp))
	{
	  unformat_input_t in;
	  unformat_init_string (&in, (char *) buffer,
				strlen ((char *) buffer));
	  if (unformat (&in, "%U", unformat_bitmap_list, &r) != 1)
	    clib_warning ("unformat_bitmap_list failed");
	  unformat_free (&in);
	}
      vec_free (buffer);
      fclose (fp);
    }
  return r;
}


/* Called early in the init sequence */

clib_error_t *
vlib_thread_init (vlib_main_t * vm)
{
  vlib_thread_main_t *tm = &vlib_thread_main;
  vlib_worker_thread_t *w;
  vlib_thread_registration_t *tr;
  u32 n_vlib_mains = 1;
  u32 first_index = 1;
  u32 i;
  uword *avail_cpu;

  /* get bitmaps of active cpu cores and sockets */
  tm->cpu_core_bitmap =
    clib_sysfs_list_to_bitmap ("/sys/devices/system/cpu/online");
  tm->cpu_socket_bitmap =
    clib_sysfs_list_to_bitmap ("/sys/devices/system/node/online");

  avail_cpu = clib_bitmap_dup (tm->cpu_core_bitmap);

  /* skip cores */
  for (i = 0; i < tm->skip_cores; i++)
    {
      uword c = clib_bitmap_first_set (avail_cpu);
      if (c == ~0)
	return clib_error_return (0, "no available cpus to skip");

      avail_cpu = clib_bitmap_set (avail_cpu, c, 0);
    }

  /* grab cpu for main thread */
  if (tm->main_lcore == ~0)
    {
      /* if main-lcore is not set, we try to use lcore 1 */
      if (clib_bitmap_get (avail_cpu, 1))
	tm->main_lcore = 1;
      else
	tm->main_lcore = clib_bitmap_first_set (avail_cpu);
      if (tm->main_lcore == (u8) ~ 0)
	return clib_error_return (0, "no available cpus to be used for the"
				  " main thread");
    }
  else
    {
      if (clib_bitmap_get (avail_cpu, tm->main_lcore) == 0)
	return clib_error_return (0, "cpu %u is not available to be used"
				  " for the main thread", tm->main_lcore);
    }
  avail_cpu = clib_bitmap_set (avail_cpu, tm->main_lcore, 0);

  /* assume that there is socket 0 only if there is no data from sysfs */
  if (!tm->cpu_socket_bitmap)
    tm->cpu_socket_bitmap = clib_bitmap_set (0, 0, 1);

  /* pin main thread to main_lcore  */
  if (tm->cb.vlib_thread_set_lcore_cb)
    {
      tm->cb.vlib_thread_set_lcore_cb (0, tm->main_lcore);
    }
  else
    {
      cpu_set_t cpuset;
      CPU_ZERO (&cpuset);
      CPU_SET (tm->main_lcore, &cpuset);
      pthread_setaffinity_np (pthread_self (), sizeof (cpu_set_t), &cpuset);
    }

  /* Set up thread 0 */
  vec_validate_aligned (vlib_worker_threads, 0, CLIB_CACHE_LINE_BYTES);
  _vec_len (vlib_worker_threads) = 1;
  w = vlib_worker_threads;
  w->thread_mheap = clib_mem_get_heap ();
  w->thread_stack = vlib_thread_stacks[0];
  w->cpu_id = tm->main_lcore;
  w->lwp = syscall (SYS_gettid);
  w->thread_id = pthread_self ();
  tm->n_vlib_mains = 1;

  vlib_get_thread_core_numa (w, w->cpu_id);

  if (tm->sched_policy != ~0)
    {
      struct sched_param sched_param;
      if (!sched_getparam (w->lwp, &sched_param))
	{
	  if (tm->sched_priority != ~0)
	    sched_param.sched_priority = tm->sched_priority;
	  sched_setscheduler (w->lwp, tm->sched_policy, &sched_param);
	}
    }

  /* assign threads to cores and set n_vlib_mains */
  tr = tm->next;

  while (tr)
    {
      vec_add1 (tm->registrations, tr);
      tr = tr->next;
    }

  vec_sort_with_function (tm->registrations, sort_registrations_by_no_clone);

  for (i = 0; i < vec_len (tm->registrations); i++)
    {
      int j;
      tr = tm->registrations[i];
      tr->first_index = first_index;
      first_index += tr->count;
      n_vlib_mains += (tr->no_data_structure_clone == 0) ? tr->count : 0;

      /* construct coremask */
      if (tr->use_pthreads || !tr->count)
	continue;

      if (tr->coremask)
	{
	  uword c;
          /* *INDENT-OFF* */
          clib_bitmap_foreach (c, tr->coremask, ({
            if (clib_bitmap_get(avail_cpu, c) == 0)
              return clib_error_return (0, "cpu %u is not available to be used"
                                        " for the '%s' thread",c, tr->name);

            avail_cpu = clib_bitmap_set(avail_cpu, c, 0);
          }));
          /* *INDENT-ON* */
	}
      else
	{
	  for (j = 0; j < tr->count; j++)
	    {
	      /* Do not use CPU 0 by default - leave it to the host and IRQs */
	      uword avail_c0 = clib_bitmap_get (avail_cpu, 0);
	      avail_cpu = clib_bitmap_set (avail_cpu, 0, 0);

	      uword c = clib_bitmap_first_set (avail_cpu);
	      /* Use CPU 0 as a last resort */
	      if (c == ~0 && avail_c0)
		{
		  c = 0;
		  avail_c0 = 0;
		}

	      if (c == ~0)
		return clib_error_return (0,
					  "no available cpus to be used for"
					  " the '%s' thread", tr->name);

	      avail_cpu = clib_bitmap_set (avail_cpu, 0, avail_c0);
	      avail_cpu = clib_bitmap_set (avail_cpu, c, 0);
	      tr->coremask = clib_bitmap_set (tr->coremask, c, 1);
	    }
	}
    }

  clib_bitmap_free (avail_cpu);

  tm->n_vlib_mains = n_vlib_mains;

  /*
   * Allocate the remaining worker threads, and thread stack vector slots
   * from now on, calls to os_get_nthreads() will return the correct
   * answer.
   */
  vec_validate_aligned (vlib_worker_threads, first_index - 1,
			CLIB_CACHE_LINE_BYTES);
  vec_validate (vlib_thread_stacks, vec_len (vlib_worker_threads) - 1);
  return 0;
}

vlib_frame_queue_t *
vlib_frame_queue_alloc (int nelts)
{
  vlib_frame_queue_t *fq;

  fq = clib_mem_alloc_aligned (sizeof (*fq), CLIB_CACHE_LINE_BYTES);
  clib_memset (fq, 0, sizeof (*fq));
  fq->nelts = nelts;
  fq->vector_threshold = 128;	// packets
  vec_validate_aligned (fq->elts, nelts - 1, CLIB_CACHE_LINE_BYTES);

  if (1)
    {
      if (((uword) & fq->tail) & (CLIB_CACHE_LINE_BYTES - 1))
	fformat (stderr, "WARNING: fq->tail unaligned\n");
      if (((uword) & fq->head) & (CLIB_CACHE_LINE_BYTES - 1))
	fformat (stderr, "WARNING: fq->head unaligned\n");
      if (((uword) fq->elts) & (CLIB_CACHE_LINE_BYTES - 1))
	fformat (stderr, "WARNING: fq->elts unaligned\n");

      if (sizeof (fq->elts[0]) % CLIB_CACHE_LINE_BYTES)
	fformat (stderr, "WARNING: fq->elts[0] size %d\n",
		 sizeof (fq->elts[0]));
      if (nelts & (nelts - 1))
	{
	  fformat (stderr, "FATAL: nelts MUST be a power of 2\n");
	  abort ();
	}
    }

  return (fq);
}

void vl_msg_api_handler_no_free (void *) __attribute__ ((weak));
void
vl_msg_api_handler_no_free (void *v)
{
}

/* Turned off, save as reference material... */
#if 0
static inline int
vlib_frame_queue_dequeue_internal (int thread_id,
				   vlib_main_t * vm, vlib_node_main_t * nm)
{
  vlib_frame_queue_t *fq = vlib_frame_queues[thread_id];
  vlib_frame_queue_elt_t *elt;
  vlib_frame_t *f;
  vlib_pending_frame_t *p;
  vlib_node_runtime_t *r;
  u32 node_runtime_index;
  int msg_type;
  u64 before;
  int processed = 0;

  ASSERT (vm == vlib_mains[thread_id]);

  while (1)
    {
      if (fq->head == fq->tail)
	return processed;

      elt = fq->elts + ((fq->head + 1) & (fq->nelts - 1));

      if (!elt->valid)
	return processed;

      before = clib_cpu_time_now ();

      f = elt->frame;
      node_runtime_index = elt->node_runtime_index;
      msg_type = elt->msg_type;

      switch (msg_type)
	{
	case VLIB_FRAME_QUEUE_ELT_FREE_BUFFERS:
	  vlib_buffer_free (vm, vlib_frame_vector_args (f), f->n_vectors);
	  /* note fallthrough... */
	case VLIB_FRAME_QUEUE_ELT_FREE_FRAME:
	  r = vec_elt_at_index (nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL],
				node_runtime_index);
	  vlib_frame_free (vm, r, f);
	  break;
	case VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME:
	  vec_add2 (vm->node_main.pending_frames, p, 1);
	  f->flags |= (VLIB_FRAME_PENDING | VLIB_FRAME_FREE_AFTER_DISPATCH);
	  p->node_runtime_index = elt->node_runtime_index;
	  p->frame_index = vlib_frame_index (vm, f);
	  p->next_frame_index = VLIB_PENDING_FRAME_NO_NEXT_FRAME;
	  fq->dequeue_vectors += (u64) f->n_vectors;
	  break;
	case VLIB_FRAME_QUEUE_ELT_API_MSG:
	  vl_msg_api_handler_no_free (f);
	  break;
	default:
	  clib_warning ("bogus frame queue message, type %d", msg_type);
	  break;
	}
      elt->valid = 0;
      fq->dequeues++;
      fq->dequeue_ticks += clib_cpu_time_now () - before;
      CLIB_MEMORY_BARRIER ();
      fq->head++;
      processed++;
    }
  ASSERT (0);
  return processed;
}

int
vlib_frame_queue_dequeue (int thread_id,
			  vlib_main_t * vm, vlib_node_main_t * nm)
{
  return vlib_frame_queue_dequeue_internal (thread_id, vm, nm);
}

int
vlib_frame_queue_enqueue (vlib_main_t * vm, u32 node_runtime_index,
			  u32 frame_queue_index, vlib_frame_t * frame,
			  vlib_frame_queue_msg_type_t type)
{
  vlib_frame_queue_t *fq = vlib_frame_queues[frame_queue_index];
  vlib_frame_queue_elt_t *elt;
  u32 save_count;
  u64 new_tail;
  u64 before = clib_cpu_time_now ();

  ASSERT (fq);

  new_tail = clib_atomic_add_fetch (&fq->tail, 1);

  /* Wait until a ring slot is available */
  while (new_tail >= fq->head + fq->nelts)
    {
      f64 b4 = vlib_time_now_ticks (vm, before);
      vlib_worker_thread_barrier_check (vm, b4);
      /* Bad idea. Dequeue -> enqueue -> dequeue -> trouble */
      // vlib_frame_queue_dequeue (vm->thread_index, vm, nm);
    }

  elt = fq->elts + (new_tail & (fq->nelts - 1));

  /* this would be very bad... */
  while (elt->valid)
    {
    }

  /* Once we enqueue the frame, frame->n_vectors is owned elsewhere... */
  save_count = frame->n_vectors;

  elt->frame = frame;
  elt->node_runtime_index = node_runtime_index;
  elt->msg_type = type;
  CLIB_MEMORY_BARRIER ();
  elt->valid = 1;

  return save_count;
}
#endif /* 0 */

/* To be called by vlib worker threads upon startup */
void
vlib_worker_thread_init (vlib_worker_thread_t * w)
{
  vlib_thread_main_t *tm = vlib_get_thread_main ();

  /*
   * Note: disabling signals in worker threads as follows
   * prevents the api post-mortem dump scheme from working
   * {
   *    sigset_t s;
   *    sigfillset (&s);
   *    pthread_sigmask (SIG_SETMASK, &s, 0);
   *  }
   */

  clib_mem_set_heap (w->thread_mheap);

  if (vec_len (tm->thread_prefix) && w->registration->short_name)
    {
      w->name = format (0, "%v_%s_%d%c", tm->thread_prefix,
			w->registration->short_name, w->instance_id, '\0');
      vlib_set_thread_name ((char *) w->name);
    }

  if (!w->registration->use_pthreads)
    {

      /* Initial barrier sync, for both worker and i/o threads */
      clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, 1);

      while (*vlib_worker_threads->wait_at_barrier)
	;

      clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, -1);
    }
}

void *
vlib_worker_thread_bootstrap_fn (void *arg)
{
  void *rv;
  vlib_worker_thread_t *w = arg;

  w->lwp = syscall (SYS_gettid);
  w->thread_id = pthread_self ();

  __os_thread_index = w - vlib_worker_threads;

  vlib_process_start_switch_stack (vlib_mains[__os_thread_index], 0);
  rv = (void *) clib_calljmp
    ((uword (*)(uword)) w->thread_function,
     (uword) arg, w->thread_stack + VLIB_THREAD_STACK_SIZE);
  /* NOTREACHED, we hope */
  return rv;
}

void
vlib_get_thread_core_numa (vlib_worker_thread_t * w, unsigned cpu_id)
{
  const char *sys_cpu_path = "/sys/devices/system/cpu/cpu";
  const char *sys_node_path = "/sys/devices/system/node/node";
  clib_bitmap_t *nbmp = 0, *cbmp = 0;
  u32 node;
  u8 *p = 0;
  int core_id = -1, numa_id = -1;

  p = format (p, "%s%u/topology/core_id%c", sys_cpu_path, cpu_id, 0);
  clib_sysfs_read ((char *) p, "%d", &core_id);
  vec_reset_length (p);

  /* *INDENT-OFF* */
  clib_sysfs_read ("/sys/devices/system/node/online", "%U",
        unformat_bitmap_list, &nbmp);
  clib_bitmap_foreach (node, nbmp, ({
    p = format (p, "%s%u/cpulist%c", sys_node_path, node, 0);
    clib_sysfs_read ((char *) p, "%U", unformat_bitmap_list, &cbmp);
    if (clib_bitmap_get (cbmp, cpu_id))
      numa_id = node;
    vec_reset_length (cbmp);
    vec_reset_length (p);
  }));
  /* *INDENT-ON* */
  vec_free (nbmp);
  vec_free (cbmp);
  vec_free (p);

  w->core_id = core_id;
  w->numa_id = numa_id;
}

static clib_error_t *
vlib_launch_thread_int (void *fp, vlib_worker_thread_t * w, unsigned cpu_id)
{
  clib_mem_main_t *mm = &clib_mem_main;
  vlib_thread_main_t *tm = &vlib_thread_main;
  void *(*fp_arg) (void *) = fp;
  void *numa_heap;

  w->cpu_id = cpu_id;
  vlib_get_thread_core_numa (w, cpu_id);

  /* Set up NUMA-bound heap if indicated */
  if (mm->per_numa_mheaps[w->numa_id] == 0)
    {
      /* If the user requested a NUMA heap, create it... */
      if (tm->numa_heap_size)
	{
	  clib_mem_set_numa_affinity (w->numa_id, 1 /* force */ );
	  numa_heap = clib_mem_create_heap (0 /* DIY */ , tm->numa_heap_size,
					    1 /* is_locked */ ,
					    "numa %u heap", w->numa_id);
	  clib_mem_set_default_numa_affinity ();
	  mm->per_numa_mheaps[w->numa_id] = numa_heap;
	}
      else
	{
	  /* Or, use the main heap */
	  mm->per_numa_mheaps[w->numa_id] = w->thread_mheap;
	}
    }

  if (tm->cb.vlib_launch_thread_cb && !w->registration->use_pthreads)
    return tm->cb.vlib_launch_thread_cb (fp, (void *) w, cpu_id);
  else
    {
      pthread_t worker;
      cpu_set_t cpuset;
      CPU_ZERO (&cpuset);
      CPU_SET (cpu_id, &cpuset);

      if (pthread_create (&worker, NULL /* attr */ , fp_arg, (void *) w))
	return clib_error_return_unix (0, "pthread_create");

      if (pthread_setaffinity_np (worker, sizeof (cpu_set_t), &cpuset))
	return clib_error_return_unix (0, "pthread_setaffinity_np");

      return 0;
    }
}

static clib_error_t *
start_workers (vlib_main_t * vm)
{
  int i, j;
  vlib_worker_thread_t *w;
  vlib_main_t *vm_clone;
  void *oldheap;
  vlib_thread_main_t *tm = &vlib_thread_main;
  vlib_thread_registration_t *tr;
  vlib_node_runtime_t *rt;
  u32 n_vlib_mains = tm->n_vlib_mains;
  u32 worker_thread_index;
  clib_mem_heap_t *main_heap = clib_mem_get_per_cpu_heap ();

  vec_reset_length (vlib_worker_threads);

  /* Set up the main thread */
  vec_add2_aligned (vlib_worker_threads, w, 1, CLIB_CACHE_LINE_BYTES);
  w->elog_track.name = "main thread";
  elog_track_register (&vm->elog_main, &w->elog_track);

  if (vec_len (tm->thread_prefix))
    {
      w->name = format (0, "%v_main%c", tm->thread_prefix, '\0');
      vlib_set_thread_name ((char *) w->name);
    }

  vm->elog_main.lock =
    clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES);
  vm->elog_main.lock[0] = 0;

  clib_callback_data_init (&vm->vlib_node_runtime_perf_callbacks,
			   &vm->worker_thread_main_loop_callback_lock);

  /* Replace hand-crafted length-1 vector with a real vector */
  vlib_mains = 0;

  vec_validate_aligned (vlib_mains, n_vlib_mains - 1, CLIB_CACHE_LINE_BYTES);
  _vec_len (vlib_mains) = 0;
  vec_add1_aligned (vlib_mains, vm, CLIB_CACHE_LINE_BYTES);

  if (n_vlib_mains > 1)
    {
      vlib_worker_threads->wait_at_barrier =
	clib_mem_alloc_aligned (sizeof (u32), CLIB_CACHE_LINE_BYTES);
      vlib_worker_threads->workers_at_barrier =
	clib_mem_alloc_aligned (sizeof (u32), CLIB_CACHE_LINE_BYTES);

      vlib_worker_threads->node_reforks_required =
	clib_mem_alloc_aligned (sizeof (u32), CLIB_CACHE_LINE_BYTES);

      /* We'll need the rpc vector lock... */
      clib_spinlock_init (&vm->pending_rpc_lock);

      /* Ask for an initial barrier sync */
      *vlib_worker_threads->workers_at_barrier = 0;
      *vlib_worker_threads->wait_at_barrier = 1;

      /* Without update or refork */
      *vlib_worker_threads->node_reforks_required = 0;
      vm->need_vlib_worker_thread_node_runtime_update = 0;

      /* init timing */
      vm->barrier_epoch = 0;
      vm->barrier_no_close_before = 0;

      worker_thread_index = 1;
      clib_spinlock_init (&vm->worker_thread_main_loop_callback_lock);

      for (i = 0; i < vec_len (tm->registrations); i++)
	{
	  vlib_node_main_t *nm, *nm_clone;
	  int k;

	  tr = tm->registrations[i];

	  if (tr->count == 0)
	    continue;

	  for (k = 0; k < tr->count; k++)
	    {
	      vlib_node_t *n;

	      vec_add2 (vlib_worker_threads, w, 1);
	      /* Currently unused, may not really work */
	      if (tr->mheap_size)
		w->thread_mheap = clib_mem_create_heap (0, tr->mheap_size,
							/* unlocked */ 0,
							"%s%d heap",
							tr->name, k);
	      else
		w->thread_mheap = main_heap;

	      w->thread_stack =
		vlib_thread_stack_init (w - vlib_worker_threads);
	      w->thread_function = tr->function;
	      w->thread_function_arg = w;
	      w->instance_id = k;
	      w->registration = tr;

	      w->elog_track.name =
		(char *) format (0, "%s %d", tr->name, k + 1);
	      vec_add1 (w->elog_track.name, 0);
	      elog_track_register (&vm->elog_main, &w->elog_track);

	      if (tr->no_data_structure_clone)
		continue;

	      /* Fork vlib_global_main et al. Look for bugs here */
	      oldheap = clib_mem_set_heap (w->thread_mheap);

	      vm_clone = clib_mem_alloc_aligned (sizeof (*vm_clone),
						 CLIB_CACHE_LINE_BYTES);
	      clib_memcpy (vm_clone, vlib_mains[0], sizeof (*vm_clone));

	      vm_clone->thread_index = worker_thread_index;
	      vm_clone->heap_base = w->thread_mheap;
	      vm_clone->heap_aligned_base = (void *)
		(((uword) w->thread_mheap) & ~(VLIB_FRAME_ALIGN - 1));
	      vm_clone->init_functions_called =
		hash_create (0, /* value bytes */ 0);
	      vm_clone->pending_rpc_requests = 0;
	      vec_validate (vm_clone->pending_rpc_requests, 0);
	      _vec_len (vm_clone->pending_rpc_requests) = 0;
	      clib_memset (&vm_clone->random_buffer, 0,
			   sizeof (vm_clone->random_buffer));
	      clib_spinlock_init
		(&vm_clone->worker_thread_main_loop_callback_lock);
	      clib_callback_data_init
		(&vm_clone->vlib_node_runtime_perf_callbacks,
		 &vm_clone->worker_thread_main_loop_callback_lock);

	      nm = &vlib_mains[0]->node_main;
	      nm_clone = &vm_clone->node_main;
	      /* fork next frames array, preserving node runtime indices */
	      nm_clone->next_frames = vec_dup_aligned (nm->next_frames,
						       CLIB_CACHE_LINE_BYTES);
	      for (j = 0; j < vec_len (nm_clone->next_frames); j++)
		{
		  vlib_next_frame_t *nf = &nm_clone->next_frames[j];
		  u32 save_node_runtime_index;
		  u32 save_flags;

		  save_node_runtime_index = nf->node_runtime_index;
		  save_flags = nf->flags & VLIB_FRAME_NO_FREE_AFTER_DISPATCH;
		  vlib_next_frame_init (nf);
		  nf->node_runtime_index = save_node_runtime_index;
		  nf->flags = save_flags;
		}

	      /* fork the frame dispatch queue */
	      nm_clone->pending_frames = 0;
	      vec_validate (nm_clone->pending_frames, 10);
	      _vec_len (nm_clone->pending_frames) = 0;

	      /* fork nodes */
	      nm_clone->nodes = 0;

	      /* Allocate all nodes in single block for speed */
	      n = clib_mem_alloc_no_fail (vec_len (nm->nodes) * sizeof (*n));

	      for (j = 0; j < vec_len (nm->nodes); j++)
		{
		  clib_memcpy (n, nm->nodes[j], sizeof (*n));
		  /* none of the copied nodes have enqueue rights given out */
		  n->owner_node_index = VLIB_INVALID_NODE_INDEX;
		  clib_memset (&n->stats_total, 0, sizeof (n->stats_total));
		  clib_memset (&n->stats_last_clear, 0,
			       sizeof (n->stats_last_clear));
		  vec_add1 (nm_clone->nodes, n);
		  n++;
		}
	      nm_clone->nodes_by_type[VLIB_NODE_TYPE_INTERNAL] =
		vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL],
				 CLIB_CACHE_LINE_BYTES);
	      vec_foreach (rt,
			   nm_clone->nodes_by_type[VLIB_NODE_TYPE_INTERNAL])
	      {
		vlib_node_t *n = vlib_get_node (vm, rt->node_index);
		rt->thread_index = vm_clone->thread_index;
		/* copy initial runtime_data from node */
		if (n->runtime_data && n->runtime_data_bytes > 0)
		  clib_memcpy (rt->runtime_data, n->runtime_data,
			       clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
					 n->runtime_data_bytes));
	      }

	      nm_clone->nodes_by_type[VLIB_NODE_TYPE_INPUT] =
		vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_INPUT],
				 CLIB_CACHE_LINE_BYTES);
	      vec_foreach (rt, nm_clone->nodes_by_type[VLIB_NODE_TYPE_INPUT])
	      {
		vlib_node_t *n = vlib_get_node (vm, rt->node_index);
		rt->thread_index = vm_clone->thread_index;
		/* copy initial runtime_data from node */
		if (n->runtime_data && n->runtime_data_bytes > 0)
		  clib_memcpy (rt->runtime_data, n->runtime_data,
			       clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
					 n->runtime_data_bytes));
	      }

	      nm_clone->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT] =
		vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT],
				 CLIB_CACHE_LINE_BYTES);
	      vec_foreach (rt,
			   nm_clone->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT])
	      {
		vlib_node_t *n = vlib_get_node (vm, rt->node_index);
		rt->thread_index = vm_clone->thread_index;
		/* copy initial runtime_data from node */
		if (n->runtime_data && n->runtime_data_bytes > 0)
		  clib_memcpy (rt->runtime_data, n->runtime_data,
			       clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
					 n->runtime_data_bytes));
	      }

	      nm_clone->processes = vec_dup_aligned (nm->processes,
						     CLIB_CACHE_LINE_BYTES);

	      /* Create per-thread frame freelist */
	      nm_clone->frame_sizes = vec_new (vlib_frame_size_t, 1);
#ifdef VLIB_SUPPORTS_ARBITRARY_SCALAR_SIZES
	      nm_clone->frame_size_hash = hash_create (0, sizeof (uword));
#endif
	      nm_clone->node_by_error = nm->node_by_error;

	      /* Packet trace buffers are guaranteed to be empty, nothing to do here */

	      clib_mem_set_heap (oldheap);
	      vec_add1_aligned (vlib_mains, vm_clone, CLIB_CACHE_LINE_BYTES);

	      /* Switch to the stats segment ... */
	      void *oldheap = vlib_stats_push_heap (0);
	      vm_clone->error_main.counters = vec_dup_aligned
		(vlib_mains[0]->error_main.counters, CLIB_CACHE_LINE_BYTES);
	      vlib_stats_pop_heap2 (vm_clone->error_main.counters,
				    worker_thread_index, oldheap, 1);

	      vm_clone->error_main.counters_last_clear = vec_dup_aligned
		(vlib_mains[0]->error_main.counters_last_clear,
		 CLIB_CACHE_LINE_BYTES);

	      worker_thread_index++;
	    }
	}
    }
  else
    {
      /* only have non-data-structure copy threads to create... */
      for (i = 0; i < vec_len (tm->registrations); i++)
	{
	  tr = tm->registrations[i];

	  for (j = 0; j < tr->count; j++)
	    {
	      vec_add2 (vlib_worker_threads, w, 1);
	      if (tr->mheap_size)
		{
		  w->thread_mheap = clib_mem_create_heap (0, tr->mheap_size,
							  /* locked */ 0,
							  "%s%d heap",
							  tr->name, j);
		}
	      else
		w->thread_mheap = main_heap;
	      w->thread_stack =
		vlib_thread_stack_init (w - vlib_worker_threads);
	      w->thread_function = tr->function;
	      w->thread_function_arg = w;
	      w->instance_id = j;
	      w->elog_track.name =
		(char *) format (0, "%s %d", tr->name, j + 1);
	      w->registration = tr;
	      vec_add1 (w->elog_track.name, 0);
	      elog_track_register (&vm->elog_main, &w->elog_track);
	    }
	}
    }

  worker_thread_index = 1;

  for (i = 0; i < vec_len (tm->registrations); i++)
    {
      clib_error_t *err;
      int j;

      tr = tm->registrations[i];

      if (tr->use_pthreads || tm->use_pthreads)
	{
	  for (j = 0; j < tr->count; j++)
	    {
	      w = vlib_worker_threads + worker_thread_index++;
	      err = vlib_launch_thread_int (vlib_worker_thread_bootstrap_fn,
					    w, 0);
	      if (err)
		clib_error_report (err);
	    }
	}
      else
	{
	  uword c;
          /* *INDENT-OFF* */
          clib_bitmap_foreach (c, tr->coremask, ({
            w = vlib_worker_threads + worker_thread_index++;
	    err = vlib_launch_thread_int (vlib_worker_thread_bootstrap_fn,
					  w, c);
	    if (err)
	      clib_error_report (err);
          }));
          /* *INDENT-ON* */
	}
    }
  vlib_worker_thread_barrier_sync (vm);
  vlib_worker_thread_barrier_release (vm);
  return 0;
}

VLIB_MAIN_LOOP_ENTER_FUNCTION (start_workers);


static inline void
worker_thread_node_runtime_update_internal (void)
{
  int i, j;
  vlib_main_t *vm;
  vlib_node_main_t *nm, *nm_clone;
  vlib_main_t *vm_clone;
  vlib_node_runtime_t *rt;
  never_inline void
    vlib_node_runtime_sync_stats (vlib_main_t * vm,
				  vlib_node_runtime_t * r,
				  uword n_calls,
				  uword n_vectors, uword n_clocks);

  ASSERT (vlib_get_thread_index () == 0);

  vm = vlib_mains[0];
  nm = &vm->node_main;

  ASSERT (*vlib_worker_threads->wait_at_barrier == 1);

  /*
   * Scrape all runtime stats, so we don't lose node runtime(s) with
   * pending counts, or throw away worker / io thread counts.
   */
  for (j = 0; j < vec_len (nm->nodes); j++)
    {
      vlib_node_t *n;
      n = nm->nodes[j];
      vlib_node_sync_stats (vm, n);
    }

  for (i = 1; i < vec_len (vlib_mains); i++)
    {
      vlib_node_t *n;

      vm_clone = vlib_mains[i];
      nm_clone = &vm_clone->node_main;

      for (j = 0; j < vec_len (nm_clone->nodes); j++)
	{
	  n = nm_clone->nodes[j];

	  rt = vlib_node_get_runtime (vm_clone, n->index);
	  vlib_node_runtime_sync_stats (vm_clone, rt, 0, 0, 0);
	}
    }

  /* Per-worker clone rebuilds are now done on each thread */
}


void
vlib_worker_thread_node_refork (void)
{
  vlib_main_t *vm, *vm_clone;
  vlib_node_main_t *nm, *nm_clone;
  vlib_node_t **old_nodes_clone;
  vlib_node_runtime_t *rt, *old_rt;

  vlib_node_t *new_n_clone;

  int j;

  vm = vlib_mains[0];
  nm = &vm->node_main;
  vm_clone = vlib_get_main ();
  nm_clone = &vm_clone->node_main;

  /* Re-clone error heap */
  u64 *old_counters = vm_clone->error_main.counters;
  u64 *old_counters_all_clear = vm_clone->error_main.counters_last_clear;

  clib_memcpy_fast (&vm_clone->error_main, &vm->error_main,
		    sizeof (vm->error_main));
  j = vec_len (vm->error_main.counters) - 1;

  /* Switch to the stats segment ... */
  void *oldheap = vlib_stats_push_heap (0);
  vec_validate_aligned (old_counters, j, CLIB_CACHE_LINE_BYTES);
  vm_clone->error_main.counters = old_counters;
  vlib_stats_pop_heap2 (vm_clone->error_main.counters, vm_clone->thread_index,
			oldheap, 0);

  vec_validate_aligned (old_counters_all_clear, j, CLIB_CACHE_LINE_BYTES);
  vm_clone->error_main.counters_last_clear = old_counters_all_clear;

  nm_clone = &vm_clone->node_main;
  vec_free (nm_clone->next_frames);
  nm_clone->next_frames = vec_dup_aligned (nm->next_frames,
					   CLIB_CACHE_LINE_BYTES);

  for (j = 0; j < vec_len (nm_clone->next_frames); j++)
    {
      vlib_next_frame_t *nf = &nm_clone->next_frames[j];
      u32 save_node_runtime_index;
      u32 save_flags;

      save_node_runtime_index = nf->node_runtime_index;
      save_flags = nf->flags & VLIB_FRAME_NO_FREE_AFTER_DISPATCH;
      vlib_next_frame_init (nf);
      nf->node_runtime_index = save_node_runtime_index;
      nf->flags = save_flags;
    }

  old_nodes_clone = nm_clone->nodes;
  nm_clone->nodes = 0;

  /* re-fork nodes */

  /* Allocate all nodes in single block for speed */
  new_n_clone =
    clib_mem_alloc_no_fail (vec_len (nm->nodes) * sizeof (*new_n_clone));
  for (j = 0; j < vec_len (nm->nodes); j++)
    {
      vlib_node_t *new_n = nm->nodes[j];

      clib_memcpy_fast (new_n_clone, new_n, sizeof (*new_n));
      /* none of the copied nodes have enqueue rights given out */
      new_n_clone->owner_node_index = VLIB_INVALID_NODE_INDEX;

      if (j >= vec_len (old_nodes_clone))
	{
	  /* new node, set to zero */
	  clib_memset (&new_n_clone->stats_total, 0,
		       sizeof (new_n_clone->stats_total));
	  clib_memset (&new_n_clone->stats_last_clear, 0,
		       sizeof (new_n_clone->stats_last_clear));
	}
      else
	{
	  vlib_node_t *old_n_clone = old_nodes_clone[j];
	  /* Copy stats if the old data is valid */
	  clib_memcpy_fast (&new_n_clone->stats_total,
			    &old_n_clone->stats_total,
			    sizeof (new_n_clone->stats_total));
	  clib_memcpy_fast (&new_n_clone->stats_last_clear,
			    &old_n_clone->stats_last_clear,
			    sizeof (new_n_clone->stats_last_clear));

	  /* keep previous node state */
	  new_n_clone->state = old_n_clone->state;
	}
      vec_add1 (nm_clone->nodes, new_n_clone);
      new_n_clone++;
    }
  /* Free the old node clones */
  clib_mem_free (old_nodes_clone[0]);

  vec_free (old_nodes_clone);


  /* re-clone internal nodes */
  old_rt = nm_clone->nodes_by_type[VLIB_NODE_TYPE_INTERNAL];
  nm_clone->nodes_by_type[VLIB_NODE_TYPE_INTERNAL] =
    vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_INTERNAL],
		     CLIB_CACHE_LINE_BYTES);

  vec_foreach (rt, nm_clone->nodes_by_type[VLIB_NODE_TYPE_INTERNAL])
  {
    vlib_node_t *n = vlib_get_node (vm, rt->node_index);
    rt->thread_index = vm_clone->thread_index;
    /* copy runtime_data, will be overwritten later for existing rt */
    if (n->runtime_data && n->runtime_data_bytes > 0)
      clib_memcpy_fast (rt->runtime_data, n->runtime_data,
			clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
				  n->runtime_data_bytes));
  }

  for (j = 0; j < vec_len (old_rt); j++)
    {
      rt = vlib_node_get_runtime (vm_clone, old_rt[j].node_index);
      rt->state = old_rt[j].state;
      clib_memcpy_fast (rt->runtime_data, old_rt[j].runtime_data,
			VLIB_NODE_RUNTIME_DATA_SIZE);
    }

  vec_free (old_rt);

  /* re-clone input nodes */
  old_rt = nm_clone->nodes_by_type[VLIB_NODE_TYPE_INPUT];
  nm_clone->nodes_by_type[VLIB_NODE_TYPE_INPUT] =
    vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_INPUT],
		     CLIB_CACHE_LINE_BYTES);

  vec_foreach (rt, nm_clone->nodes_by_type[VLIB_NODE_TYPE_INPUT])
  {
    vlib_node_t *n = vlib_get_node (vm, rt->node_index);
    rt->thread_index = vm_clone->thread_index;
    /* copy runtime_data, will be overwritten later for existing rt */
    if (n->runtime_data && n->runtime_data_bytes > 0)
      clib_memcpy_fast (rt->runtime_data, n->runtime_data,
			clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
				  n->runtime_data_bytes));
  }

  for (j = 0; j < vec_len (old_rt); j++)
    {
      rt = vlib_node_get_runtime (vm_clone, old_rt[j].node_index);
      rt->state = old_rt[j].state;
      clib_memcpy_fast (rt->runtime_data, old_rt[j].runtime_data,
			VLIB_NODE_RUNTIME_DATA_SIZE);
    }

  vec_free (old_rt);

  /* re-clone pre-input nodes */
  old_rt = nm_clone->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT];
  nm_clone->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT] =
    vec_dup_aligned (nm->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT],
		     CLIB_CACHE_LINE_BYTES);

  vec_foreach (rt, nm_clone->nodes_by_type[VLIB_NODE_TYPE_PRE_INPUT])
  {
    vlib_node_t *n = vlib_get_node (vm, rt->node_index);
    rt->thread_index = vm_clone->thread_index;
    /* copy runtime_data, will be overwritten later for existing rt */
    if (n->runtime_data && n->runtime_data_bytes > 0)
      clib_memcpy_fast (rt->runtime_data, n->runtime_data,
			clib_min (VLIB_NODE_RUNTIME_DATA_SIZE,
				  n->runtime_data_bytes));
  }

  for (j = 0; j < vec_len (old_rt); j++)
    {
      rt = vlib_node_get_runtime (vm_clone, old_rt[j].node_index);
      rt->state = old_rt[j].state;
      clib_memcpy_fast (rt->runtime_data, old_rt[j].runtime_data,
			VLIB_NODE_RUNTIME_DATA_SIZE);
    }

  vec_free (old_rt);

  nm_clone->processes = vec_dup_aligned (nm->processes,
					 CLIB_CACHE_LINE_BYTES);
  nm_clone->node_by_error = nm->node_by_error;
}

void
vlib_worker_thread_node_runtime_update (void)
{
  /*
   * Make a note that we need to do a node runtime update
   * prior to releasing the barrier.
   */
  vlib_global_main.need_vlib_worker_thread_node_runtime_update = 1;
}

u32
unformat_sched_policy (unformat_input_t * input, va_list * args)
{
  u32 *r = va_arg (*args, u32 *);

  if (0);
#define _(v,f,s) else if (unformat (input, s)) *r = SCHED_POLICY_##f;
  foreach_sched_policy
#undef _
    else
    return 0;
  return 1;
}

static clib_error_t *
cpu_config (vlib_main_t * vm, unformat_input_t * input)
{
  vlib_thread_registration_t *tr;
  uword *p;
  vlib_thread_main_t *tm = &vlib_thread_main;
  u8 *name;
  uword *bitmap;
  u32 count;

  tm->thread_registrations_by_name = hash_create_string (0, sizeof (uword));

  tm->n_thread_stacks = 1;	/* account for main thread */
  tm->sched_policy = ~0;
  tm->sched_priority = ~0;
  tm->main_lcore = ~0;

  tr = tm->next;

  while (tr)
    {
      hash_set_mem (tm->thread_registrations_by_name, tr->name, (uword) tr);
      tr = tr->next;
    }

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "use-pthreads"))
	tm->use_pthreads = 1;
      else if (unformat (input, "thread-prefix %v", &tm->thread_prefix))
	;
      else if (unformat (input, "main-core %u", &tm->main_lcore))
	;
      else if (unformat (input, "skip-cores %u", &tm->skip_cores))
	;
      else if (unformat (input, "numa-heap-size %U",
			 unformat_memory_size, &tm->numa_heap_size))
	;
      else if (unformat (input, "coremask-%s %U", &name,
			 unformat_bitmap_mask, &bitmap) ||
	       unformat (input, "corelist-%s %U", &name,
			 unformat_bitmap_list, &bitmap))
	{
	  p = hash_get_mem (tm->thread_registrations_by_name, name);
	  if (p == 0)
	    return clib_error_return (0, "no such thread type '%s'", name);

	  tr = (vlib_thread_registration_t *) p[0];

	  if (tr->use_pthreads)
	    return clib_error_return (0,
				      "corelist cannot be set for '%s' threads",
				      name);
	  if (tr->count)
	    return clib_error_return
	      (0, "core placement of '%s' threads is already configured",
	       name);

	  tr->coremask = bitmap;
	  tr->count = clib_bitmap_count_set_bits (tr->coremask);
	}
      else
	if (unformat
	    (input, "scheduler-policy %U", unformat_sched_policy,
	     &tm->sched_policy))
	;
      else if (unformat (input, "scheduler-priority %u", &tm->sched_priority))
	;
      else if (unformat (input, "%s %u", &name, &count))
	{
	  p = hash_get_mem (tm->thread_registrations_by_name, name);
	  if (p == 0)
	    return clib_error_return (0, "no such thread type 3 '%s'", name);

	  tr = (vlib_thread_registration_t *) p[0];

	  if (tr->fixed_count)
	    return clib_error_return
	      (0, "number of '%s' threads not configurable", name);
	  if (tr->count)
	    return clib_error_return
	      (0, "number of '%s' threads is already configured", name);

	  tr->count = count;
	}
      else
	break;
    }

  if (tm->sched_priority != ~0)
    {
      if (tm->sched_policy == SCHED_FIFO || tm->sched_policy == SCHED_RR)
	{
	  u32 prio_max = sched_get_priority_max (tm->sched_policy);
	  u32 prio_min = sched_get_priority_min (tm->sched_policy);
	  if (tm->sched_priority > prio_max)
	    tm->sched_priority = prio_max;
	  if (tm->sched_priority < prio_min)
	    tm->sched_priority = prio_min;
	}
      else
	{
	  return clib_error_return
	    (0,
	     "scheduling priority (%d) is not allowed for `normal` scheduling policy",
	     tm->sched_priority);
	}
    }
  tr = tm->next;

  if (!tm->thread_prefix)
    tm->thread_prefix = format (0, "vpp");

  while (tr)
    {
      tm->n_thread_stacks += tr->count;
      tm->n_pthreads += tr->count * tr->use_pthreads;
      tm->n_threads += tr->count * (tr->use_pthreads == 0);
      tr = tr->next;
    }

  return 0;
}

VLIB_EARLY_CONFIG_FUNCTION (cpu_config, "cpu");

void vnet_main_fixup (vlib_fork_fixup_t which) __attribute__ ((weak));
void
vnet_main_fixup (vlib_fork_fixup_t which)
{
}

void
vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which)
{
  vlib_main_t *vm = vlib_get_main ();

  if (vlib_mains == 0)
    return;

  ASSERT (vlib_get_thread_index () == 0);
  vlib_worker_thread_barrier_sync (vm);

  switch (which)
    {
    case VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX:
      vnet_main_fixup (VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX);
      break;

    default:
      ASSERT (0);
    }
  vlib_worker_thread_barrier_release (vm);
}

  /*
   * Enforce minimum open time to minimize packet loss due to Rx overflow,
   * based on a test based heuristic that barrier should be open for at least
   * 3 time as long as it is closed (with an upper bound of 1ms because by that
   *  point it is probably too late to make a difference)
   */

#ifndef BARRIER_MINIMUM_OPEN_LIMIT
#define BARRIER_MINIMUM_OPEN_LIMIT 0.001
#endif

#ifndef BARRIER_MINIMUM_OPEN_FACTOR
#define BARRIER_MINIMUM_OPEN_FACTOR 3
#endif

void
vlib_worker_thread_initial_barrier_sync_and_release (vlib_main_t * vm)
{
  f64 deadline;
  f64 now = vlib_time_now (vm);
  u32 count = vec_len (vlib_mains) - 1;

  /* No worker threads? */
  if (count == 0)
    return;

  deadline = now + BARRIER_SYNC_TIMEOUT;
  *vlib_worker_threads->wait_at_barrier = 1;
  while (*vlib_worker_threads->workers_at_barrier != count)
    {
      if ((now = vlib_time_now (vm)) > deadline)
	{
	  fformat (stderr, "%s: worker thread deadlock\n", __FUNCTION__);
	  os_panic ();
	}
      CLIB_PAUSE ();
    }
  *vlib_worker_threads->wait_at_barrier = 0;
}

/**
 * Return true if the wroker thread barrier is held
 */
u8
vlib_worker_thread_barrier_held (void)
{
  if (vec_len (vlib_mains) < 2)
    return (1);

  return (*vlib_worker_threads->wait_at_barrier == 1);
}

void
vlib_worker_thread_barrier_sync_int (vlib_main_t * vm, const char *func_name)
{
  f64 deadline;
  f64 now;
  f64 t_entry;
  f64 t_open;
  f64 t_closed;
  f64 max_vector_rate;
  u32 count;
  int i;

  if (vec_len (vlib_mains) < 2)
    return;

  ASSERT (vlib_get_thread_index () == 0);

  vlib_worker_threads[0].barrier_caller = func_name;
  count = vec_len (vlib_mains) - 1;

  /* Record entry relative to last close */
  now = vlib_time_now (vm);
  t_entry = now - vm->barrier_epoch;

  /* Tolerate recursive calls */
  if (++vlib_worker_threads[0].recursion_level > 1)
    {
      barrier_trace_sync_rec (t_entry);
      return;
    }

  if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
    clib_call_callbacks (vm->barrier_perf_callbacks, vm,
			 vm->clib_time.last_cpu_time, 0 /* enter */ );

  /*
   * Need data to decide if we're working hard enough to honor
   * the barrier hold-down timer.
   */
  max_vector_rate = 0.0;
  for (i = 1; i < vec_len (vlib_mains); i++)
    max_vector_rate =
      clib_max (max_vector_rate,
		(f64) vlib_last_vectors_per_main_loop (vlib_mains[i]));

  vlib_worker_threads[0].barrier_sync_count++;

  /* Enforce minimum barrier open time to minimize packet loss */
  ASSERT (vm->barrier_no_close_before <= (now + BARRIER_MINIMUM_OPEN_LIMIT));

  /*
   * If any worker thread seems busy, which we define
   * as a vector rate above 10, we enforce the barrier hold-down timer
   */
  if (max_vector_rate > 10.0)
    {
      while (1)
	{
	  now = vlib_time_now (vm);
	  /* Barrier hold-down timer expired? */
	  if (now >= vm->barrier_no_close_before)
	    break;
	  if ((vm->barrier_no_close_before - now)
	      > (2.0 * BARRIER_MINIMUM_OPEN_LIMIT))
	    {
	      clib_warning
		("clock change: would have waited for %.4f seconds",
		 (vm->barrier_no_close_before - now));
	      break;
	    }
	}
    }
  /* Record time of closure */
  t_open = now - vm->barrier_epoch;
  vm->barrier_epoch = now;

  deadline = now + BARRIER_SYNC_TIMEOUT;

  *vlib_worker_threads->wait_at_barrier = 1;
  while (*vlib_worker_threads->workers_at_barrier != count)
    {
      if ((now = vlib_time_now (vm)) > deadline)
	{
	  fformat (stderr, "%s: worker thread deadlock\n", __FUNCTION__);
	  os_panic ();
	}
    }

  t_closed = now - vm->barrier_epoch;

  barrier_trace_sync (t_entry, t_open, t_closed);

}

void
vlib_worker_thread_barrier_release (vlib_main_t * vm)
{
  f64 deadline;
  f64 now;
  f64 minimum_open;
  f64 t_entry;
  f64 t_closed_total;
  f64 t_update_main = 0.0;
  int refork_needed = 0;

  if (vec_len (vlib_mains) < 2)
    return;

  ASSERT (vlib_get_thread_index () == 0);


  now = vlib_time_now (vm);
  t_entry = now - vm->barrier_epoch;

  if (--vlib_worker_threads[0].recursion_level > 0)
    {
      barrier_trace_release_rec (t_entry);
      return;
    }

  /* Update (all) node runtimes before releasing the barrier, if needed */
  if (vm->need_vlib_worker_thread_node_runtime_update)
    {
      /*
       * Lock stat segment here, so we's safe when
       * rebuilding the stat segment node clones from the
       * stat thread...
       */
      vlib_stat_segment_lock ();

      /* Do stats elements on main thread */
      worker_thread_node_runtime_update_internal ();
      vm->need_vlib_worker_thread_node_runtime_update = 0;

      /* Do per thread rebuilds in parallel */
      refork_needed = 1;
      clib_atomic_fetch_add (vlib_worker_threads->node_reforks_required,
			     (vec_len (vlib_mains) - 1));
      now = vlib_time_now (vm);
      t_update_main = now - vm->barrier_epoch;
    }

  deadline = now + BARRIER_SYNC_TIMEOUT;

  /*
   * Note when we let go of the barrier.
   * Workers can use this to derive a reasonably accurate
   * time offset. See vlib_time_now(...)
   */
  vm->time_last_barrier_release = vlib_time_now (vm);
  CLIB_MEMORY_STORE_BARRIER ();

  *vlib_worker_threads->wait_at_barrier = 0;

  while (*vlib_worker_threads->workers_at_barrier > 0)
    {
      if ((now = vlib_time_now (vm)) > deadline)
	{
	  fformat (stderr, "%s: worker thread deadlock\n", __FUNCTION__);
	  os_panic ();
	}
    }

  /* Wait for reforks before continuing */
  if (refork_needed)
    {
      now = vlib_time_now (vm);

      deadline = now + BARRIER_SYNC_TIMEOUT;

      while (*vlib_worker_threads->node_reforks_required > 0)
	{
	  if ((now = vlib_time_now (vm)) > deadline)
	    {
	      fformat (stderr, "%s: worker thread refork deadlock\n",
		       __FUNCTION__);
	      os_panic ();
	    }
	}
      vlib_stat_segment_unlock ();
    }

  t_closed_total = now - vm->barrier_epoch;

  minimum_open = t_closed_total * BARRIER_MINIMUM_OPEN_FACTOR;

  if (minimum_open > BARRIER_MINIMUM_OPEN_LIMIT)
    {
      minimum_open = BARRIER_MINIMUM_OPEN_LIMIT;
    }

  vm->barrier_no_close_before = now + minimum_open;

  /* Record barrier epoch (used to enforce minimum open time) */
  vm->barrier_epoch = now;

  barrier_trace_release (t_entry, t_closed_total, t_update_main);

  if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
    clib_call_callbacks (vm->barrier_perf_callbacks, vm,
			 vm->clib_time.last_cpu_time, 1 /* leave */ );
}

/**
 * Wait until each of the workers has been once around the track
 */
void
vlib_worker_wait_one_loop (void)
{
  ASSERT (vlib_get_thread_index () == 0);

  if (vec_len (vlib_mains) < 2)
    return;

  if (vlib_worker_thread_barrier_held ())
    return;

  u32 *counts = 0;
  u32 ii;

  vec_validate (counts, vec_len (vlib_mains) - 1);

  /* record the current loop counts */
  vec_foreach_index (ii, vlib_mains)
    counts[ii] = vlib_mains[ii]->main_loop_count;

  /* spin until each changes, apart from the main thread, or we'd be
   * a while */
  for (ii = 1; ii < vec_len (counts); ii++)
    {
      while (counts[ii] == vlib_mains[ii]->main_loop_count)
	CLIB_PAUSE ();
    }

  vec_free (counts);
  return;
}

/*
 * Check the frame queue to see if any frames are available.
 * If so, pull the packets off the frames and put them to
 * the handoff node.
 */
int
vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm)
{
  u32 thread_id = vm->thread_index;
  vlib_frame_queue_t *fq = fqm->vlib_frame_queues[thread_id];
  vlib_frame_queue_elt_t *elt;
  u32 *from, *to;
  vlib_frame_t *f;
  int msg_type;
  int processed = 0;
  u32 n_left_to_node;
  u32 vectors = 0;

  ASSERT (fq);
  ASSERT (vm == vlib_mains[thread_id]);

  if (PREDICT_FALSE (fqm->node_index == ~0))
    return 0;
  /*
   * Gather trace data for frame queues
   */
  if (PREDICT_FALSE (fq->trace))
    {
      frame_queue_trace_t *fqt;
      frame_queue_nelt_counter_t *fqh;
      u32 elix;

      fqt = &fqm->frame_queue_traces[thread_id];

      fqt->nelts = fq->nelts;
      fqt->head = fq->head;
      fqt->head_hint = fq->head_hint;
      fqt->tail = fq->tail;
      fqt->threshold = fq->vector_threshold;
      fqt->n_in_use = fqt->tail - fqt->head;
      if (fqt->n_in_use >= fqt->nelts)
	{
	  // if beyond max then use max
	  fqt->n_in_use = fqt->nelts - 1;
	}

      /* Record the number of elements in use in the histogram */
      fqh = &fqm->frame_queue_histogram[thread_id];
      fqh->count[fqt->n_in_use]++;

      /* Record a snapshot of the elements in use */
      for (elix = 0; elix < fqt->nelts; elix++)
	{
	  elt = fq->elts + ((fq->head + 1 + elix) & (fq->nelts - 1));
	  if (1 || elt->valid)
	    {
	      fqt->n_vectors[elix] = elt->n_vectors;
	    }
	}
      fqt->written = 1;
    }

  while (1)
    {
      vlib_buffer_t *b;
      if (fq->head == fq->tail)
	{
	  fq->head_hint = fq->head;
	  return processed;
	}

      elt = fq->elts + ((fq->head + 1) & (fq->nelts - 1));

      if (!elt->valid)
	{
	  fq->head_hint = fq->head;
	  return processed;
	}

      from = elt->buffer_index;
      msg_type = elt->msg_type;

      ASSERT (msg_type == VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME);
      ASSERT (elt->n_vectors <= VLIB_FRAME_SIZE);

      f = vlib_get_frame_to_node (vm, fqm->node_index);

      /* If the first vector is traced, set the frame trace flag */
      b = vlib_get_buffer (vm, from[0]);
      if (b->flags & VLIB_BUFFER_IS_TRACED)
	f->frame_flags |= VLIB_NODE_FLAG_TRACE;

      to = vlib_frame_vector_args (f);

      n_left_to_node = elt->n_vectors;

      while (n_left_to_node >= 4)
	{
	  to[0] = from[0];
	  to[1] = from[1];
	  to[2] = from[2];
	  to[3] = from[3];
	  to += 4;
	  from += 4;
	  n_left_to_node -= 4;
	}

      while (n_left_to_node > 0)
	{
	  to[0] = from[0];
	  to++;
	  from++;
	  n_left_to_node--;
	}

      vectors += elt->n_vectors;
      f->n_vectors = elt->n_vectors;
      vlib_put_frame_to_node (vm, fqm->node_index, f);

      elt->valid = 0;
      elt->n_vectors = 0;
      elt->msg_type = 0xfefefefe;
      CLIB_MEMORY_BARRIER ();
      fq->head++;
      processed++;

      /*
       * Limit the number of packets pushed into the graph
       */
      if (vectors >= fq->vector_threshold)
	{
	  fq->head_hint = fq->head;
	  return processed;
	}
    }
  ASSERT (0);
  return processed;
}

void
vlib_worker_thread_fn (void *arg)
{
  vlib_worker_thread_t *w = (vlib_worker_thread_t *) arg;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  vlib_main_t *vm = vlib_get_main ();
  clib_error_t *e;

  vlib_process_finish_switch_stack (vm);

  ASSERT (vm->thread_index == vlib_get_thread_index ());

  vlib_worker_thread_init (w);
  clib_time_init (&vm->clib_time);
  clib_mem_set_heap (w->thread_mheap);

  e = vlib_call_init_exit_functions_no_sort
    (vm, &vm->worker_init_function_registrations, 1 /* call_once */ );
  if (e)
    clib_error_report (e);

  /* Wait until the dpdk init sequence is complete */
  while (tm->extern_thread_mgmt && tm->worker_thread_release == 0)
    vlib_worker_thread_barrier_check ();

  vlib_worker_loop (vm);
}

/* *INDENT-OFF* */
VLIB_REGISTER_THREAD (worker_thread_reg, static) = {
  .name = "workers",
  .short_name = "wk",
  .function = vlib_worker_thread_fn,
};
/* *INDENT-ON* */

u32
vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts)
{
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  vlib_frame_queue_main_t *fqm;
  vlib_frame_queue_t *fq;
  int i;
  u32 num_threads;

  if (frame_queue_nelts == 0)
    frame_queue_nelts = FRAME_QUEUE_MAX_NELTS;

  num_threads = 1 /* main thread */  + tm->n_threads;
  ASSERT (frame_queue_nelts >= 8 + num_threads);

  vec_add2 (tm->frame_queue_mains, fqm, 1);

  fqm->node_index = node_index;
  fqm->frame_queue_nelts = frame_queue_nelts;
  fqm->queue_hi_thresh = frame_queue_nelts - num_threads;

  vec_validate (fqm->vlib_frame_queues, tm->n_vlib_mains - 1);
  vec_validate (fqm->per_thread_data, tm->n_vlib_mains - 1);
  _vec_len (fqm->vlib_frame_queues) = 0;
  for (i = 0; i < tm->n_vlib_mains; i++)
    {
      vlib_frame_queue_per_thread_data_t *ptd;
      fq = vlib_frame_queue_alloc (frame_queue_nelts);
      vec_add1 (fqm->vlib_frame_queues, fq);

      ptd = vec_elt_at_index (fqm->per_thread_data, i);
      vec_validate (ptd->handoff_queue_elt_by_thread_index,
		    tm->n_vlib_mains - 1);
      vec_validate_init_empty (ptd->congested_handoff_queue_by_thread_index,
			       tm->n_vlib_mains - 1,
			       (vlib_frame_queue_t *) (~0));
    }

  return (fqm - tm->frame_queue_mains);
}

int
vlib_thread_cb_register (struct vlib_main_t *vm, vlib_thread_callbacks_t * cb)
{
  vlib_thread_main_t *tm = vlib_get_thread_main ();

  if (tm->extern_thread_mgmt)
    return -1;

  tm->cb.vlib_launch_thread_cb = cb->vlib_launch_thread_cb;
  tm->extern_thread_mgmt = 1;
  return 0;
}

void
vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
				     args)
{
  ASSERT (vlib_get_thread_index () == 0);
  vlib_process_signal_event (vlib_get_main (), args->node_index,
			     args->type_opaque, args->data);
}

void *rpc_call_main_thread_cb_fn;

void
vlib_rpc_call_main_thread (void *callback, u8 * args, u32 arg_size)
{
  if (rpc_call_main_thread_cb_fn)
    {
      void (*fp) (void *, u8 *, u32) = rpc_call_main_thread_cb_fn;
      (*fp) (callback, args, arg_size);
    }
  else
    clib_warning ("BUG: rpc_call_main_thread_cb_fn NULL!");
}

clib_error_t *
threads_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (threads_init);


static clib_error_t *
show_clock_command_fn (vlib_main_t * vm,
		       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  int i;
  int verbose = 0;
  clib_timebase_t _tb, *tb = &_tb;

  (void) unformat (input, "verbose %=", &verbose, 1);

  clib_timebase_init (tb, 0 /* GMT */ , CLIB_TIMEBASE_DAYLIGHT_NONE,
		      &vm->clib_time);

  vlib_cli_output (vm, "%U, %U GMT", format_clib_time, &vm->clib_time,
		   verbose, format_clib_timebase_time,
		   clib_timebase_now (tb));

  if (vec_len (vlib_mains) == 1)
    return 0;

  vlib_cli_output (vm, "Time last barrier release %.9f",
		   vm->time_last_barrier_release);

  for (i = 1; i < vec_len (vlib_mains); i++)
    {
      if (vlib_mains[i] == 0)
	continue;

      vlib_cli_output (vm, "%d: %U", i, format_clib_time,
		       &vlib_mains[i]->clib_time, verbose);

      vlib_cli_output (vm, "Thread %d offset %.9f error %.9f", i,
		       vlib_mains[i]->time_offset,
		       vm->time_last_barrier_release -
		       vlib_mains[i]->time_last_barrier_release);
    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (f_command, static) =
{
  .path = "show clock",
  .short_help = "show clock",
  .function = show_clock_command_fn,
};
/* *INDENT-ON* */

vlib_thread_main_t *
vlib_get_thread_main_not_inline (void)
{
  return vlib_get_thread_main ();
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */