Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 1 | /* |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 2 | * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | #ifndef _DCCP_CCID2_H_ |
| 19 | #define _DCCP_CCID2_H_ |
| 20 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 21 | #include <linux/timer.h> |
| 22 | #include <linux/types.h> |
| 23 | #include "../ccid.h" |
Gerrit Renker | d82b6f8 | 2010-08-29 19:23:10 +0000 | [diff] [blame] | 24 | #include "../dccp.h" |
| 25 | |
| 26 | /* |
| 27 | * CCID-2 timestamping faces the same issues as TCP timestamping. |
| 28 | * Hence we reuse/share as much of the code as possible. |
| 29 | */ |
| 30 | #define ccid2_time_stamp tcp_time_stamp |
| 31 | |
Gerrit Renker | 63df18a | 2007-11-24 22:04:35 -0200 | [diff] [blame] | 32 | /* NUMDUPACK parameter from RFC 4341, p. 6 */ |
| 33 | #define NUMDUPACK 3 |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 34 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 35 | struct ccid2_seq { |
| 36 | u64 ccid2s_seq; |
Gerrit Renker | d82b6f8 | 2010-08-29 19:23:10 +0000 | [diff] [blame] | 37 | u32 ccid2s_sent; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 38 | int ccid2s_acked; |
| 39 | struct ccid2_seq *ccid2s_prev; |
| 40 | struct ccid2_seq *ccid2s_next; |
| 41 | }; |
| 42 | |
Andrea Bittau | 6472c05 | 2006-11-26 01:07:50 -0200 | [diff] [blame] | 43 | #define CCID2_SEQBUF_LEN 1024 |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 44 | #define CCID2_SEQBUF_MAX 128 |
| 45 | |
Gerrit Renker | aa1b1ff | 2009-09-12 07:47:01 +0000 | [diff] [blame] | 46 | /** |
| 47 | * struct ccid2_hc_tx_sock - CCID2 TX half connection |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 48 | * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5 |
| 49 | * @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465) |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 50 | * @tx_srtt: smoothed RTT estimate, scaled by 2^3 |
| 51 | * @tx_mdev: smoothed RTT variation, scaled by 2^2 |
| 52 | * @tx_mdev_max: maximum of @mdev during one flight |
| 53 | * @tx_rttvar: moving average/maximum of @mdev_max |
| 54 | * @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988) |
| 55 | * @tx_rtt_seq: to decay RTTVAR at most once per flight |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 56 | * @tx_rpseq: last consecutive seqno |
| 57 | * @tx_rpdupack: dupacks since rpseq |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 58 | * @tx_av_chunks: list of Ack Vectors received on current skb |
Gerrit Renker | aa1b1ff | 2009-09-12 07:47:01 +0000 | [diff] [blame] | 59 | */ |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 60 | struct ccid2_hc_tx_sock { |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 61 | u32 tx_cwnd; |
| 62 | u32 tx_ssthresh; |
| 63 | u32 tx_pipe; |
| 64 | u32 tx_packets_acked; |
| 65 | struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX]; |
| 66 | int tx_seqbufc; |
| 67 | struct ccid2_seq *tx_seqh; |
| 68 | struct ccid2_seq *tx_seqt; |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 69 | |
| 70 | /* RTT measurement: variables/principles are the same as in TCP */ |
| 71 | u32 tx_srtt, |
| 72 | tx_mdev, |
| 73 | tx_mdev_max, |
| 74 | tx_rttvar, |
| 75 | tx_rto; |
| 76 | u64 tx_rtt_seq:48; |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 77 | struct timer_list tx_rtotimer; |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 78 | |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 79 | u64 tx_rpseq; |
| 80 | int tx_rpdupack; |
Gerrit Renker | d82b6f8 | 2010-08-29 19:23:10 +0000 | [diff] [blame] | 81 | u32 tx_last_cong; |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 82 | u64 tx_high_ack; |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 83 | struct list_head tx_av_chunks; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 84 | }; |
| 85 | |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 86 | static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc) |
| 87 | { |
| 88 | return hc->tx_pipe >= hc->tx_cwnd; |
| 89 | } |
| 90 | |
Gerrit Renker | b4d5f4b | 2011-07-03 09:04:18 -0600 | [diff] [blame^] | 91 | /* |
| 92 | * Convert RFC 3390 larger initial window into an equivalent number of packets. |
| 93 | * This is based on the numbers specified in RFC 5681, 3.1. |
| 94 | */ |
| 95 | static inline u32 rfc3390_bytes_to_packets(const u32 smss) |
| 96 | { |
| 97 | return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3); |
| 98 | } |
| 99 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 100 | struct ccid2_hc_rx_sock { |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 101 | int rx_data; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 102 | }; |
| 103 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 104 | static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk) |
| 105 | { |
| 106 | return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); |
| 107 | } |
| 108 | |
| 109 | static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk) |
| 110 | { |
| 111 | return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); |
| 112 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 113 | #endif /* _DCCP_CCID2_H_ */ |