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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.
+ */
+#ifndef included_vlib_threads_h
+#define included_vlib_threads_h
+
+#include <vlib/main.h>
+#include <linux/sched.h>
+
+/*
+ * To enable detailed tracing of barrier usage, including call stacks and
+ * timings, define BARRIER_TRACING here or in relevant TAGS. If also used
+ * with CLIB_DEBUG, timing will _not_ be representative of normal code
+ * execution.
+ *
+ */
+
+// #define BARRIER_TRACING 1
+
+/*
+ * Two options for barrier tracing output: syslog & elog.
+ */
+
+// #define BARRIER_TRACING_ELOG 1
+
+extern vlib_main_t **vlib_mains;
+
+void vlib_set_thread_name (char *name);
+
+/* arg is actually a vlib__thread_t * */
+typedef void (vlib_thread_function_t) (void *arg);
+
+typedef struct vlib_thread_registration_
+{
+ /* constructor generated list of thread registrations */
+ struct vlib_thread_registration_ *next;
+
+ /* config parameters */
+ char *name;
+ char *short_name;
+ vlib_thread_function_t *function;
+ uword mheap_size;
+ int fixed_count;
+ u32 count;
+ int no_data_structure_clone;
+ u32 frame_queue_nelts;
+
+ /* All threads of this type run on pthreads */
+ int use_pthreads;
+ u32 first_index;
+ uword *coremask;
+} vlib_thread_registration_t;
+
+/*
+ * Frames have their cpu / vlib_main_t index in the low-order N bits
+ * Make VLIB_MAX_CPUS a power-of-two, please...
+ */
+
+#ifndef VLIB_MAX_CPUS
+#define VLIB_MAX_CPUS 256
+#endif
+
+#if VLIB_MAX_CPUS > CLIB_MAX_MHEAPS
+#error Please increase number of per-cpu mheaps
+#endif
+
+#define VLIB_CPU_MASK (VLIB_MAX_CPUS - 1) /* 0x3f, max */
+#define VLIB_OFFSET_MASK (~VLIB_CPU_MASK)
+
+#define VLIB_LOG2_THREAD_STACK_SIZE (21)
+#define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)
+
+typedef enum
+{
+ VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME,
+} vlib_frame_queue_msg_type_t;
+
+typedef struct
+{
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+ volatile u32 valid;
+ u32 msg_type;
+ u32 n_vectors;
+ u32 last_n_vectors;
+
+ /* 256 * 4 = 1024 bytes, even mult of cache line size */
+ u32 buffer_index[VLIB_FRAME_SIZE];
+}
+vlib_frame_queue_elt_t;
+
+typedef struct
+{
+ /* First cache line */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+ volatile u32 *wait_at_barrier;
+ volatile u32 *workers_at_barrier;
+
+ /* Second Cache Line */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
+ void *thread_mheap;
+ u8 *thread_stack;
+ void (*thread_function) (void *);
+ void *thread_function_arg;
+ i64 recursion_level;
+ elog_track_t elog_track;
+ u32 instance_id;
+ vlib_thread_registration_t *registration;
+ u8 *name;
+ u64 barrier_sync_count;
+#ifdef BARRIER_TRACING
+ const char *barrier_caller;
+ const char *barrier_context;
+#endif
+ volatile u32 *node_reforks_required;
+
+ long lwp;
+ int lcore_id;
+ pthread_t thread_id;
+} vlib_worker_thread_t;
+
+extern vlib_worker_thread_t *vlib_worker_threads;
+
+typedef struct
+{
+ /* enqueue side */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+ volatile u64 tail;
+ u64 enqueues;
+ u64 enqueue_ticks;
+ u64 enqueue_vectors;
+ u32 enqueue_full_events;
+
+ /* dequeue side */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
+ volatile u64 head;
+ u64 dequeues;
+ u64 dequeue_ticks;
+ u64 dequeue_vectors;
+ u64 trace;
+ u64 vector_threshold;
+
+ /* dequeue hint to enqueue side */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
+ volatile u64 head_hint;
+
+ /* read-only, constant, shared */
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline3);
+ vlib_frame_queue_elt_t *elts;
+ u32 nelts;
+}
+vlib_frame_queue_t;
+
+typedef struct
+{
+ u32 node_index;
+ vlib_frame_queue_t **vlib_frame_queues;
+
+ /* for frame queue tracing */
+ frame_queue_trace_t *frame_queue_traces;
+ frame_queue_nelt_counter_t *frame_queue_histogram;
+} vlib_frame_queue_main_t;
+
+typedef struct
+{
+ uword node_index;
+ uword type_opaque;
+ uword data;
+} vlib_process_signal_event_mt_args_t;
+
+/* Called early, in thread 0's context */
+clib_error_t *vlib_thread_init (vlib_main_t * vm);
+
+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);
+
+int
+vlib_frame_queue_dequeue (vlib_main_t * vm, vlib_frame_queue_main_t * fqm);
+
+void vlib_worker_thread_node_runtime_update (void);
+
+void vlib_create_worker_threads (vlib_main_t * vm, int n,
+ void (*thread_function) (void *));
+
+void vlib_worker_thread_init (vlib_worker_thread_t * w);
+u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
+
+/* Check for a barrier sync request every 30ms */
+#define BARRIER_SYNC_DELAY (0.030000)
+
+#if CLIB_DEBUG > 0
+/* long barrier timeout, for gdb... */
+#define BARRIER_SYNC_TIMEOUT (600.1)
+#else
+#define BARRIER_SYNC_TIMEOUT (1.0)
+#endif
+
+#ifdef BARRIER_TRACING
+#define vlib_worker_thread_barrier_sync(X) {vlib_worker_threads[0].barrier_caller=__FUNCTION__;vlib_worker_thread_barrier_sync_int(X);}
+#else
+#define vlib_worker_thread_barrier_sync(X) vlib_worker_thread_barrier_sync_int(X)
+#endif
+
+
+void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm);
+void vlib_worker_thread_barrier_release (vlib_main_t * vm);
+void vlib_worker_thread_node_refork (void);
+
+static_always_inline uword
+vlib_get_thread_index (void)
+{
+ return __os_thread_index;
+}
+
+always_inline void
+vlib_smp_unsafe_warning (void)
+{
+ if (CLIB_DEBUG > 0)
+ {
+ if (vlib_get_thread_index ())
+ fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
+ }
+}
+
+typedef enum
+{
+ VLIB_WORKER_THREAD_FORK_FIXUP_ILLEGAL = 0,
+ VLIB_WORKER_THREAD_FORK_FIXUP_NEW_SW_IF_INDEX,
+} vlib_fork_fixup_t;
+
+void vlib_worker_thread_fork_fixup (vlib_fork_fixup_t which);
+
+#define foreach_vlib_main(body) \
+do { \
+ vlib_main_t ** __vlib_mains = 0, *this_vlib_main; \
+ int ii; \
+ \
+ for (ii = 0; ii < vec_len (vlib_mains); ii++) \
+ { \
+ this_vlib_main = vlib_mains[ii]; \
+ ASSERT (ii == 0 || \
+ this_vlib_main->parked_at_barrier == 1); \
+ if (this_vlib_main) \
+ vec_add1 (__vlib_mains, this_vlib_main); \
+ } \
+ \
+ for (ii = 0; ii < vec_len (__vlib_mains); ii++) \
+ { \
+ this_vlib_main = __vlib_mains[ii]; \
+ /* body uses this_vlib_main... */ \
+ (body); \
+ } \
+ vec_free (__vlib_mains); \
+} while (0);
+
+#define foreach_sched_policy \
+ _(SCHED_OTHER, OTHER, "other") \
+ _(SCHED_BATCH, BATCH, "batch") \
+ _(SCHED_IDLE, IDLE, "idle") \
+ _(SCHED_FIFO, FIFO, "fifo") \
+ _(SCHED_RR, RR, "rr")
+
+typedef enum
+{
+#define _(v,f,s) SCHED_POLICY_##f = v,
+ foreach_sched_policy
+#undef _
+ SCHED_POLICY_N,
+} sched_policy_t;
+
+typedef struct
+{
+ clib_error_t *(*vlib_launch_thread_cb) (void *fp, vlib_worker_thread_t * w,
+ unsigned lcore_id);
+ clib_error_t *(*vlib_thread_set_lcore_cb) (u32 thread, u16 lcore);
+} vlib_thread_callbacks_t;
+
+typedef struct
+{
+ /* Link list of registrations, built by constructors */
+ vlib_thread_registration_t *next;
+
+ /* Vector of registrations, w/ non-data-structure clones at the top */
+ vlib_thread_registration_t **registrations;
+
+ uword *thread_registrations_by_name;
+
+ vlib_worker_thread_t *worker_threads;
+
+ /*
+ * Launch all threads as pthreads,
+ * not eal_rte_launch (strict affinity) threads
+ */
+ int use_pthreads;
+
+ /* Number of vlib_main / vnet_main clones */
+ u32 n_vlib_mains;
+
+ /* Number of thread stacks to create */
+ u32 n_thread_stacks;
+
+ /* Number of pthreads */
+ u32 n_pthreads;
+
+ /* Number of threads */
+ u32 n_threads;
+
+ /* Number of cores to skip, must match the core mask */
+ u32 skip_cores;
+
+ /* Thread prefix name */
+ u8 *thread_prefix;
+
+ /* main thread lcore */
+ u8 main_lcore;
+
+ /* Bitmap of available CPU cores */
+ uword *cpu_core_bitmap;
+
+ /* Bitmap of available CPU sockets (NUMA nodes) */
+ uword *cpu_socket_bitmap;
+
+ /* Worker handoff queues */
+ vlib_frame_queue_main_t *frame_queue_mains;
+
+ /* worker thread initialization barrier */
+ volatile u32 worker_thread_release;
+
+ /* scheduling policy */
+ u32 sched_policy;
+
+ /* scheduling policy priority */
+ u32 sched_priority;
+
+ /* callbacks */
+ vlib_thread_callbacks_t cb;
+ int extern_thread_mgmt;
+} vlib_thread_main_t;
+
+extern vlib_thread_main_t vlib_thread_main;
+
+#include <vlib/global_funcs.h>
+
+#define VLIB_REGISTER_THREAD(x,...) \
+ __VA_ARGS__ vlib_thread_registration_t x; \
+static void __vlib_add_thread_registration_##x (void) \
+ __attribute__((__constructor__)) ; \
+static void __vlib_add_thread_registration_##x (void) \
+{ \
+ vlib_thread_main_t * tm = &vlib_thread_main; \
+ x.next = tm->next; \
+ tm->next = &x; \
+} \
+__VA_ARGS__ vlib_thread_registration_t x
+
+always_inline u32
+vlib_num_workers ()
+{
+ return vlib_thread_main.n_vlib_mains - 1;
+}
+
+always_inline u32
+vlib_get_worker_thread_index (u32 worker_index)
+{
+ return worker_index + 1;
+}
+
+always_inline u32
+vlib_get_worker_index (u32 thread_index)
+{
+ return thread_index - 1;
+}
+
+always_inline u32
+vlib_get_current_worker_index ()
+{
+ return vlib_get_thread_index () - 1;
+}
+
+static inline void
+vlib_worker_thread_barrier_check (void)
+{
+ if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
+ {
+ vlib_main_t *vm;
+ clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, 1);
+ if (CLIB_DEBUG > 0)
+ {
+ vm = vlib_get_main ();
+ vm->parked_at_barrier = 1;
+ }
+ while (*vlib_worker_threads->wait_at_barrier)
+ ;
+ if (CLIB_DEBUG > 0)
+ vm->parked_at_barrier = 0;
+ clib_smp_atomic_add (vlib_worker_threads->workers_at_barrier, -1);
+
+ if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
+ {
+ vlib_worker_thread_node_refork ();
+ clib_smp_atomic_add (vlib_worker_threads->node_reforks_required,
+ -1);
+ while (*vlib_worker_threads->node_reforks_required)
+ ;
+ }
+ }
+}
+
+always_inline vlib_main_t *
+vlib_get_worker_vlib_main (u32 worker_index)
+{
+ vlib_main_t *vm;
+ vlib_thread_main_t *tm = &vlib_thread_main;
+ ASSERT (worker_index < tm->n_vlib_mains - 1);
+ vm = vlib_mains[worker_index + 1];
+ ASSERT (vm);
+ return vm;
+}
+
+static inline void
+vlib_put_frame_queue_elt (vlib_frame_queue_elt_t * hf)
+{
+ CLIB_MEMORY_BARRIER ();
+ hf->valid = 1;
+}
+
+static inline vlib_frame_queue_elt_t *
+vlib_get_frame_queue_elt (u32 frame_queue_index, u32 index)
+{
+ vlib_frame_queue_t *fq;
+ vlib_frame_queue_elt_t *elt;
+ vlib_thread_main_t *tm = &vlib_thread_main;
+ vlib_frame_queue_main_t *fqm =
+ vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
+ u64 new_tail;
+
+ fq = fqm->vlib_frame_queues[index];
+ ASSERT (fq);
+
+ new_tail = __sync_add_and_fetch (&fq->tail, 1);
+
+ /* Wait until a ring slot is available */
+ while (new_tail >= fq->head_hint + fq->nelts)
+ vlib_worker_thread_barrier_check ();
+
+ elt = fq->elts + (new_tail & (fq->nelts - 1));
+
+ /* this would be very bad... */
+ while (elt->valid)
+ ;
+
+ elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
+ elt->last_n_vectors = elt->n_vectors = 0;
+
+ return elt;
+}
+
+static inline vlib_frame_queue_t *
+is_vlib_frame_queue_congested (u32 frame_queue_index,
+ u32 index,
+ u32 queue_hi_thresh,
+ vlib_frame_queue_t **
+ handoff_queue_by_worker_index)
+{
+ vlib_frame_queue_t *fq;
+ vlib_thread_main_t *tm = &vlib_thread_main;
+ vlib_frame_queue_main_t *fqm =
+ vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
+
+ fq = handoff_queue_by_worker_index[index];
+ if (fq != (vlib_frame_queue_t *) (~0))
+ return fq;
+
+ fq = fqm->vlib_frame_queues[index];
+ ASSERT (fq);
+
+ if (PREDICT_FALSE (fq->tail >= (fq->head_hint + queue_hi_thresh)))
+ {
+ /* a valid entry in the array will indicate the queue has reached
+ * the specified threshold and is congested
+ */
+ handoff_queue_by_worker_index[index] = fq;
+ fq->enqueue_full_events++;
+ return fq;
+ }
+
+ return NULL;
+}
+
+static inline vlib_frame_queue_elt_t *
+vlib_get_worker_handoff_queue_elt (u32 frame_queue_index,
+ u32 vlib_worker_index,
+ vlib_frame_queue_elt_t **
+ handoff_queue_elt_by_worker_index)
+{
+ vlib_frame_queue_elt_t *elt;
+
+ if (handoff_queue_elt_by_worker_index[vlib_worker_index])
+ return handoff_queue_elt_by_worker_index[vlib_worker_index];
+
+ elt = vlib_get_frame_queue_elt (frame_queue_index, vlib_worker_index);
+
+ handoff_queue_elt_by_worker_index[vlib_worker_index] = elt;
+
+ return elt;
+}
+
+u8 *vlib_thread_stack_init (uword thread_index);
+int vlib_thread_cb_register (struct vlib_main_t *vm,
+ vlib_thread_callbacks_t * cb);
+extern void *rpc_call_main_thread_cb_fn;
+
+void
+vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
+ args);
+void vlib_rpc_call_main_thread (void *function, u8 * args, u32 size);
+
+#endif /* included_vlib_threads_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */