/*
 * Copyright (c) 2015 Los Alamos National Security, LLC. All rights reserved.
 * Copyright (c) 2015-2016 Cray Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * BSD license below:
 *
 *     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.
 *
 * 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 _GNIX_EQ_H_
#define _GNIX_EQ_H_

#include <rdma/fi_eq.h>
#include <stdbool.h>

#include "gnix_queue.h"
#include "gnix_wait.h"
#include "gnix_util.h"

#define GNIX_EQ_DEFAULT_SIZE 256

extern struct dlist_entry gnix_eq_list;
extern pthread_mutex_t gnix_eq_list_lock;

/*
 * Stores events inside of the event queue.
 *
 * type: EQ event type defined in fi_eq.h
 * len: length of the event
 * flags: control flags
 * buf: event
 * item: list entry, contains next pointer
 */
struct gnix_eq_entry {
	uint64_t flags;
	uint32_t type;
	size_t len;
	void *the_entry;

	struct slist_entry item;
};

struct gnix_eq_poll_obj {
	struct dlist_entry list;
	struct fid *obj_fid;
};

struct gnix_eq_err_buf {
	struct dlist_entry dlist;
	int do_free;
	char buf[];
};

/*
 * EQ structure. Contains error and event queue.
 */
struct gnix_fid_eq {
	struct fid_eq eq_fid;
	struct gnix_fid_fabric *fabric;

	bool requires_lock;

	struct gnix_queue *events;
	struct gnix_queue *errors;

	struct fi_eq_attr attr;

	struct fid_wait *wait;

	fastlock_t lock;
	struct gnix_reference ref_cnt;

	rwlock_t poll_obj_lock;
	struct dlist_entry poll_objs;
	struct dlist_entry gnix_fid_eq_list;

	struct dlist_entry err_bufs;
};

ssize_t _gnix_eq_write_error(struct gnix_fid_eq *eq, fid_t fid,
			     void *context, uint64_t index, int err,
			     int prov_errno, void *err_data,
			     size_t err_size);

int _gnix_eq_progress(struct gnix_fid_eq *eq);

int _gnix_eq_poll_obj_add(struct gnix_fid_eq *eq, struct fid *obj_fid);
int _gnix_eq_poll_obj_rem(struct gnix_fid_eq *eq, struct fid *obj_fid);

#endif /* _GNIX_EQ_H_ */