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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation. All rights reserved.
* Copyright (c) 2020 Mellanox Technologies LTD. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SPDK_THREAD_INTERNAL_H_
#define SPDK_THREAD_INTERNAL_H_
#include "spdk/stdinc.h"
#include "spdk/thread.h"
#define SPDK_MAX_POLLER_NAME_LEN 256
#define SPDK_MAX_THREAD_NAME_LEN 256
enum spdk_poller_state {
/* The poller is registered with a thread but not currently executing its fn. */
SPDK_POLLER_STATE_WAITING,
/* The poller is currently running its fn. */
SPDK_POLLER_STATE_RUNNING,
/* The poller was unregistered during the execution of its fn. */
SPDK_POLLER_STATE_UNREGISTERED,
/* The poller is in the process of being paused. It will be paused
* during the next time it's supposed to be executed.
*/
SPDK_POLLER_STATE_PAUSING,
/* The poller is registered but currently paused. It's on the
* paused_pollers list.
*/
SPDK_POLLER_STATE_PAUSED,
};
struct spdk_poller {
TAILQ_ENTRY(spdk_poller) tailq;
/* Current state of the poller; should only be accessed from the poller's thread. */
enum spdk_poller_state state;
uint64_t period_ticks;
uint64_t next_run_tick;
uint64_t run_count;
uint64_t busy_count;
spdk_poller_fn fn;
void *arg;
struct spdk_thread *thread;
char name[SPDK_MAX_POLLER_NAME_LEN + 1];
};
enum spdk_thread_state {
/* The thread is pocessing poller and message by spdk_thread_poll(). */
SPDK_THREAD_STATE_RUNNING,
/* The thread is in the process of termination. It reaps unregistering
* poller are releasing I/O channel.
*/
SPDK_THREAD_STATE_EXITING,
/* The thread is exited. It is ready to call spdk_thread_destroy(). */
SPDK_THREAD_STATE_EXITED,
};
struct spdk_thread {
uint64_t tsc_last;
struct spdk_thread_stats stats;
/*
* Contains pollers actively running on this thread. Pollers
* are run round-robin. The thread takes one poller from the head
* of the ring, executes it, then puts it back at the tail of
* the ring.
*/
TAILQ_HEAD(active_pollers_head, spdk_poller) active_pollers;
/**
* Contains pollers running on this thread with a periodic timer.
*/
TAILQ_HEAD(timed_pollers_head, spdk_poller) timed_pollers;
/*
* Contains paused pollers. Pollers on this queue are waiting until
* they are resumed (in which case they're put onto the active/timer
* queues) or unregistered.
*/
TAILQ_HEAD(paused_pollers_head, spdk_poller) paused_pollers;
struct spdk_ring *messages;
SLIST_HEAD(, spdk_msg) msg_cache;
size_t msg_cache_count;
spdk_msg_fn critical_msg;
uint64_t id;
enum spdk_thread_state state;
TAILQ_HEAD(, spdk_io_channel) io_channels;
TAILQ_ENTRY(spdk_thread) tailq;
char name[SPDK_MAX_THREAD_NAME_LEN + 1];
struct spdk_cpuset cpumask;
uint64_t exit_timeout_tsc;
/* User context allocated at the end */
uint8_t ctx[0];
};
const char *spdk_poller_state_str(enum spdk_poller_state state);
const char *spdk_io_device_get_name(struct io_device *dev);
#endif /* SPDK_THREAD_INTERNAL_H_ */
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