mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
891b8ed467
throughout the source tree. Requested by: Grenville Armitage, Director of CAIA at Swinburne University of Technology MFC after: 3 days
90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/*-
|
|
* Copyright (c) 2009-2010
|
|
* Swinburne University of Technology, Melbourne, Australia
|
|
* Copyright (c) 2010 Lawrence Stewart <lstewart@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed at the Centre for Advanced Internet
|
|
* Architectures, Swinburne University of Technology, by David Hayes, made
|
|
* possible in part by a grant from the Cisco University Research Program Fund
|
|
* at Community Foundation Silicon Valley.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* The ERTT (Enhanced Round Trip Time) Khelp module calculates an estimate of
|
|
* the instantaneous TCP RTT which, for example, is used by delay-based
|
|
* congestion control schemes. When the module is loaded, ERTT data is
|
|
* calculated for each active TCP connection and encapsulated within a
|
|
* "struct ertt".
|
|
*
|
|
* This software was first released in 2010 by David Hayes and Lawrence Stewart
|
|
* whilst working on the NewTCP research project at Swinburne University of
|
|
* Technology's Centre for Advanced Internet Architectures, Melbourne,
|
|
* Australia, which was made possible in part by a grant from the Cisco
|
|
* University Research Program Fund at Community Foundation Silicon Valley.
|
|
* Testing and development was further assisted by a grant from the FreeBSD
|
|
* Foundation. More details are available at:
|
|
* http://caia.swin.edu.au/urp/newtcp/
|
|
*/
|
|
|
|
#ifndef _NETINET_KHELP_H_ERTT_
|
|
#define _NETINET_KHELP_H_ERTT_
|
|
|
|
struct txseginfo;
|
|
|
|
/* Structure used as the ertt data block. */
|
|
struct ertt {
|
|
/* Information about transmitted segments to aid in RTT calculation. */
|
|
TAILQ_HEAD(txseginfo_head, txseginfo) txsegi_q;
|
|
/* Bytes TX so far in marked RTT. */
|
|
long bytes_tx_in_rtt;
|
|
/* Final version of above. */
|
|
long bytes_tx_in_marked_rtt;
|
|
/* cwnd for marked RTT. */
|
|
unsigned long marked_snd_cwnd;
|
|
/* Per-packet measured RTT. */
|
|
int rtt;
|
|
/* Maximum RTT measured. */
|
|
int maxrtt;
|
|
/* Minimum RTT measured. */
|
|
int minrtt;
|
|
/* Guess if the receiver is using delayed ack. */
|
|
int dlyack_rx;
|
|
/* Keep track of inconsistencies in packet timestamps. */
|
|
int timestamp_errors;
|
|
/* RTT for a marked packet. */
|
|
int markedpkt_rtt;
|
|
/* Flags to signal conditions between hook function calls. */
|
|
uint32_t flags;
|
|
};
|
|
|
|
/* Flags for struct ertt. */
|
|
#define ERTT_NEW_MEASUREMENT 0x01
|
|
#define ERTT_MEASUREMENT_IN_PROGRESS 0x02
|
|
#define ERTT_TSO_DISABLED 0x04
|
|
|
|
#endif /* _NETINET_KHELP_H_ERTT_ */
|