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/*-
 * Copyright (c) 2017 Tom Jones <tj@enoti.me>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#ifndef _CC_NEWRENO_H
#define _CC_NEWRENO_H

#define CCALGONAME_NEWRENO "newreno"

struct newreno {
	uint32_t beta;
	uint32_t beta_ecn;
	uint32_t newreno_flags;
	uint32_t css_baseline_minrtt;
	uint32_t css_current_round_minrtt;
	uint32_t css_lastround_minrtt;
	uint32_t css_rttsample_count;
	uint32_t css_entered_at_round;
	uint32_t css_current_round;
	uint32_t css_fas_at_css_entry;
	uint32_t css_lowrtt_fas;
	uint32_t css_last_fas;
};

struct cc_newreno_opts {
	int		name;
	uint32_t	val;
};

#define CC_NEWRENO_BETA			1	/* Beta for normal DUP-ACK/Sack recovery */
#define CC_NEWRENO_BETA_ECN		2	/* ECN Beta for Abe */
#define CC_NEWRENO_ENABLE_HYSTART	3	/* Enable hystart */

/* Flags values */
#define CC_NEWRENO_HYSTART_ALLOWED	0x0001	/* Does the tcp connection allow hystart? */
#define CC_NEWRENO_HYSTART_ENABLED	0x0002	/* We can do hystart, a loss removes this flag */
#define CC_NEWRENO_HYSTART_IN_CSS	0x0004	/* If we enter hystart CSS this flag is set */
#define CC_NEWRENO_HYSTART_CAN_SH_CWND	0x0008	/* Can hystart when going CSS -> CA slam the cwnd */
#define CC_NEWRENO_HYSTART_CONS_SSTH	0x0010	/* Should hystart use the more conservative sstrhesh */
#define CC_NEWRENO_BETA_ECN_ENABLED	0x0020
#endif /* _CC_NEWRENO_H */