1ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo#ifndef _DCCP_LI_HIST_ 2ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo#define _DCCP_LI_HIST_ 3ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo/* 48a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * Copyright (c) 2007 The University of Aberdeen, Scotland, UK 5b2f41ff4139c0df8d06f352acc962a62fc07a0c3Ian McDonald * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. 6b2f41ff4139c0df8d06f352acc962a62fc07a0c3Ian McDonald * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> 7ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 8ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * 9ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify it 10ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * under the terms of the GNU General Public License as published by the Free 11ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * Software Foundation; either version 2 of the License, or (at your option) 12ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo * any later version. 13ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo */ 14e7c2335794b949292ecfd01902c429e2ac3937e1Arnaldo Carvalho de Melo#include <linux/ktime.h> 15ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo#include <linux/list.h> 168a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker#include <linux/slab.h> 178a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 188a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker/* 198a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * Number of loss intervals (RFC 4342, 8.6.1). The history size is one more than 208a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * NINTERVAL, since the `open' interval I_0 is always stored as the first entry. 218a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker */ 228a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker#define NINTERVAL 8 238a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker#define LIH_SIZE (NINTERVAL + 1) 248a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 258a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker/** 268a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * tfrc_loss_interval - Loss history record for TFRC-based protocols 278a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @li_seqno: Highest received seqno before the start of loss 288a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @li_ccval: The CCVal belonging to @li_seqno 298a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @li_is_closed: Whether @li_seqno is older than 1 RTT 308a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @li_length: Loss interval sequence length 318a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker */ 328a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstruct tfrc_loss_interval { 338a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker u64 li_seqno:48, 348a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker li_ccval:4, 358a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker li_is_closed:1; 368a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker u32 li_length; 378a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker}; 388a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 398a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker/** 408a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * tfrc_loss_hist - Loss record database 418a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @ring: Circular queue managed in LIFO manner 428a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @counter: Current count of entries (can be more than %LIH_SIZE) 438a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker * @i_mean: Current Average Loss Interval [RFC 3448, 5.4] 448a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker */ 458a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstruct tfrc_loss_hist { 468a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker struct tfrc_loss_interval *ring[LIH_SIZE]; 478a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker u8 counter; 488a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker u32 i_mean; 498a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker}; 508a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 518a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstatic inline void tfrc_lh_init(struct tfrc_loss_hist *lh) 528a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker{ 538a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker memset(lh, 0, sizeof(struct tfrc_loss_hist)); 548a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker} 558a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 568a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstatic inline u8 tfrc_lh_is_initialised(struct tfrc_loss_hist *lh) 578a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker{ 588a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker return lh->counter > 0; 598a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker} 608a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker 618a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstatic inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh) 628a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker{ 638a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker return min(lh->counter, (u8)LIH_SIZE); 648a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renker} 65ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo 668a9c7e92e0ca97632126feee32ba2698b4eb6c8fGerrit Renkerstruct tfrc_rx_hist; 673f71c81ac37b27b824e9ce18fe17438dc2af4a16Gerrit Renker 68a402a5aa9b4cbb42cc41bf573d2e5c4713541af0Joe Perchesint tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *, 69a402a5aa9b4cbb42cc41bf573d2e5c4713541af0Joe Perches u32 (*first_li)(struct sock *), struct sock *); 70a402a5aa9b4cbb42cc41bf573d2e5c4713541af0Joe Perchesu8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *); 71a402a5aa9b4cbb42cc41bf573d2e5c4713541af0Joe Perchesvoid tfrc_lh_cleanup(struct tfrc_loss_hist *lh); 72ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo 73ae6706f0678b89de07ad3b456893cc883584f711Arnaldo Carvalho de Melo#endif /* _DCCP_LI_HIST_ */ 74