1 #ifndef _LINUX_TFRC_H_ 2 #define _LINUX_TFRC_H_ 3 /* 4 * TFRC - Data Structures for the TCP-Friendly Rate Control congestion 5 * control mechanism as specified in RFC 3448. 6 * 7 * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. 8 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> 9 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 10 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 */ 17 #include <linux/types.h> 18 19 /** tfrc_rx_info - TFRC Receiver Data Structure 20 * 21 * @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2) 22 * @tfrcrx_rtt: round-trip-time (communicated by sender) 23 * @tfrcrx_p: current estimate of loss event rate (3.2.2) 24 */ 25 struct tfrc_rx_info { 26 __u32 tfrcrx_x_recv; 27 __u32 tfrcrx_rtt; 28 __u32 tfrcrx_p; 29 }; 30 31 /** tfrc_tx_info - TFRC Sender Data Structure 32 * 33 * @tfrctx_x: computed transmit rate (4.3 (4)) 34 * @tfrctx_x_recv: receiver estimate of send rate (4.3) 35 * @tfrctx_x_calc: return value of throughput equation (3.1) 36 * @tfrctx_rtt: (moving average) estimate of RTT (4.3) 37 * @tfrctx_p: current loss event rate (5.4) 38 * @tfrctx_rto: estimate of RTO, equals 4*RTT (4.3) 39 * @tfrctx_ipi: inter-packet interval (4.6) 40 * 41 * Note: X and X_recv are both maintained in units of 64 * bytes/second. This 42 * enables a finer resolution of sending rates and avoids problems with 43 * integer arithmetic; u32 is not sufficient as scaling consumes 6 bits. 44 */ 45 struct tfrc_tx_info { 46 __u64 tfrctx_x; 47 __u64 tfrctx_x_recv; 48 __u32 tfrctx_x_calc; 49 __u32 tfrctx_rtt; 50 __u32 tfrctx_p; 51 __u32 tfrctx_rto; 52 __u32 tfrctx_ipi; 53 }; 54 55 #endif /* _LINUX_TFRC_H_ */ 56