/* * 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 #include #include #include #include #include #include #include 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 st
#!/bin/bash

# Copyright (c) 2020 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.

set -eEo pipefail

CLANG_FORMAT_VER_REGEX='([0-9]+)\.[0-9]+\.[0-9]+'
CLANG_FORMAT_DIFF="/usr/share/clang/clang-format-diff.py"

# TODO: Remove clang-format-${CLANG_FORMAT_VER} from 'make install-deps' when
#       CLANG_FORMAT_VER default value is upgraded
CLANG_FORMAT_VER=${CLANG_FORMAT_VER:-11}
GIT_DIFF_ARGS="-U0 --no-color --relative HEAD~1"
GIT_DIFF_EXCLUDE_LIST=(
    ':!*.patch'
    ':(exclude)*src/vppinfra/dlmalloc.*'
)
CLANG_FORMAT_DIFF_ARGS="-style file -p1"
SUFFIX="-${CLANG_FORMAT_VER}"

# Attempt to find clang-format to confirm Clang version.
if command -v clang-format${SUFFIX} &> /dev/null;
then
    CLANG_FORMAT=clang-format${SUFFIX}
elif command -v clang-format &> /dev/null;
then
    CLANG_FORMAT=clang-format
fi

CLANG_FORMAT_VERSION=$(${CLANG_FORMAT} --version)
echo $CLANG_FORMAT_VERSION

# Confirm that Clang is the expected version.
if [[ ! $CLANG_FORMAT_VERSION =~ $CLANG_FORMAT_VER_REGEX ]];
then
    echo "*******************************************************************"
    echo "* CHECKSTYLE VERSION REGEX CHECK FAILED"
    echo "* $CLANG_FORMAT_VERSION"
    echo "*******************************************************************"
    exit 1
fi

if [[ ! $CLANG_FORMAT_VER == "${BASH_REMATCH[1]}" ]];
then
    echo "*******************************************************************"
    echo "* CHECKSTYLE VERSION CHECK FAILED"
    echo "* Expected major version $CLANG_FORMAT_VER, found ${BASH_REMATCH[1]}"
    echo "*******************************************************************"
    exit 1
fi

# Attempt to find clang-format-diff.
if command -v clang-format-diff${SUFFIX} &> /dev/null;
then
    CLANG_FORMAT_DIFF=clang-format-diff${SUFFIX}
elif command -v clang-format-diff.py &> /dev/null;
then
    CLANG_FORMAT_DIFF=clang-format-diff.py
elif command -v clang-format-diff &> /dev/null;
then
    CLANG_FORMAT_DIFF=clang-format-diff
elif [ ! -f $CLANG_FORMAT_DIFF ] ;
then
    echo "*******************************************************************"
    echo "* CHECKSTYLE FAILED"
    echo "* Could not locate the clang-format-diff script"
    echo "*******************************************************************"
    exit 1
fi

in=$(mktemp)
git diff ${GIT_DIFF_ARGS} ${GIT_DIFF_EXCLUDE_LIST[@]} > ${in}

line_count=$(sed -n '/^+.*\*INDENT-O[NF][F]\{0,1\}\*/p' ${in} | wc -l)
if [ ${line_count} -gt 0 ] ; then
    echo
    sed -n '/^+++ /{h}; /^+.*\*INDENT-O[NF][F]\{0,1\}\*/{x;p;x;p;}' ${in}
    echo
    echo "*******************************************************************"
    echo "* CHECKSTYLE FAILED"
    echo "* Please remove INDENT-ON and INDENT-OFF from modified lines."
    echo "*******************************************************************"
    rm ${in}
    exit 1
fi

if [ "${1}" == "--fix" ]; then
  cat ${in} | ${CLANG_FORMAT_DIFF} ${CLANG_FORMAT_DIFF_ARGS} -i
  filelist=$(sed -n 's/^+++ b\/\(.*\.[ch]\)/\1/p' ${in})
  git status ${filelist}
  rm ${in}
  exit 0
fi

line_count=$(sed -n '/^+.*\s\+$/p' ${in} | wc -l)
if [ ${line_count} -gt 0 ] ; then
    echo
    sed -n '/^+++/h; /^+.*\s\+$/{x;p;x;p;}' ${in}
    echo
    echo "*******************************************************************"
    echo "* CHECKSTYLE FAILED"
    echo "* Trailing whitespace detected"
    echo "*******************************************************************"
    rm ${in}
    exit 1
fi

out=$(mktemp)

cat ${in} | ${CLANG_FORMAT_DIFF} ${CLANG_FORMAT_DIFF_ARGS} > ${out}
rm ${in}

line_count=$(cat ${out} | wc -l)

if [ -t 1 ] && [ -n $(tput colors) ] && [ $(tput colors) -ge 1 ] && \
   command -v highlight &> /dev/null ; then
  highlight --syntax diff -O ansi ${out}
else
  cat ${out}
fi

rm ${out}

if [ ${line_count} -gt 0 ] ; then
    echo "*******************************************************************"
    echo "* CHECKSTYLE FAILED"
    echo "* CONSULT DIFF ABOVE"
    echo "* NOTE: Running 'extras/scripts/checkstyle.sh --fix' *MAY* fix the issue"
    echo "*******************************************************************"
    exit 1
else
    echo "*******************************************************************"
    echo "* CHECKSTYLE SUCCESSFULLY COMPLETED"
    echo "*******************************************************************"
    exit 0
fi
->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; } 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; } /* * 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); } /* * 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; 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* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */