b84a2189c4
Credit here goes to Gerrit Renker, that provided the initial implementation for
this new codebase.
I modified it just to try to make it closer to the existing API, renaming some
functions, add namespacing and fix one bug where the tfrc_rx_hist_alloc was not
freeing the allocated ring entries on the error path.
Original changeset comment from Gerrit:
-----------
This provides a new, self-contained and generic RX history service for TFRC
based protocols.
Details:
* new data structure, initialisation and cleanup routines;
* allocation of dccp_rx_hist entries local to packet_history.c,
as a service exported by the dccp_tfrc_lib module.
* interface to automatically track highest-received seqno;
* receiver-based RTT estimation (needed for instance by RFC 3448, 6.3.1);
* a generic function to test for `data packets' as per RFC 4340, sec. 7.7.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
172 lines
6.2 KiB
C
172 lines
6.2 KiB
C
/*
|
|
* net/dccp/ccids/ccid3.h
|
|
*
|
|
* Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
|
|
* Copyright (c) 2007 The University of Aberdeen, Scotland, UK
|
|
*
|
|
* An implementation of the DCCP protocol
|
|
*
|
|
* This code has been developed by the University of Waikato WAND
|
|
* research group. For further information please see http://www.wand.net.nz/
|
|
* or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
|
|
*
|
|
* This code also uses code from Lulea University, rereleased as GPL by its
|
|
* authors:
|
|
* Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
|
|
*
|
|
* Changes to meet Linux coding standards, to make it meet latest ccid3 draft
|
|
* and to make it work as a loadable module in the DCCP stack written by
|
|
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
|
|
*
|
|
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#ifndef _DCCP_CCID3_H_
|
|
#define _DCCP_CCID3_H_
|
|
|
|
#include <linux/ktime.h>
|
|
#include <linux/list.h>
|
|
#include <linux/types.h>
|
|
#include <linux/tfrc.h>
|
|
#include "lib/packet_history.h"
|
|
#include "../ccid.h"
|
|
|
|
/* Two seconds as per RFC 3448 4.2 */
|
|
#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
|
|
|
|
/* In usecs - half the scheduling granularity as per RFC3448 4.6 */
|
|
#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
|
|
|
|
/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
|
|
#define TFRC_T_MBI 64
|
|
|
|
enum ccid3_options {
|
|
TFRC_OPT_LOSS_EVENT_RATE = 192,
|
|
TFRC_OPT_LOSS_INTERVALS = 193,
|
|
TFRC_OPT_RECEIVE_RATE = 194,
|
|
};
|
|
|
|
struct ccid3_options_received {
|
|
u64 ccid3or_seqno:48,
|
|
ccid3or_loss_intervals_idx:16;
|
|
u16 ccid3or_loss_intervals_len;
|
|
u32 ccid3or_loss_event_rate;
|
|
u32 ccid3or_receive_rate;
|
|
};
|
|
|
|
/* TFRC sender states */
|
|
enum ccid3_hc_tx_states {
|
|
TFRC_SSTATE_NO_SENT = 1,
|
|
TFRC_SSTATE_NO_FBACK,
|
|
TFRC_SSTATE_FBACK,
|
|
TFRC_SSTATE_TERM,
|
|
};
|
|
|
|
/** struct ccid3_hc_tx_sock - CCID3 sender half-connection socket
|
|
*
|
|
* @ccid3hctx_x - Current sending rate in 64 * bytes per second
|
|
* @ccid3hctx_x_recv - Receive rate in 64 * bytes per second
|
|
* @ccid3hctx_x_calc - Calculated rate in bytes per second
|
|
* @ccid3hctx_rtt - Estimate of current round trip time in usecs
|
|
* @ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
|
|
* @ccid3hctx_s - Packet size in bytes
|
|
* @ccid3hctx_t_rto - Nofeedback Timer setting in usecs
|
|
* @ccid3hctx_t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
|
|
* @ccid3hctx_state - Sender state, one of %ccid3_hc_tx_states
|
|
* @ccid3hctx_last_win_count - Last window counter sent
|
|
* @ccid3hctx_t_last_win_count - Timestamp of earliest packet
|
|
* with last_win_count value sent
|
|
* @ccid3hctx_no_feedback_timer - Handle to no feedback timer
|
|
* @ccid3hctx_t_ld - Time last doubled during slow start
|
|
* @ccid3hctx_t_nom - Nominal send time of next packet
|
|
* @ccid3hctx_delta - Send timer delta (RFC 3448, 4.6) in usecs
|
|
* @ccid3hctx_hist - Packet history
|
|
* @ccid3hctx_options_received - Parsed set of retrieved options
|
|
*/
|
|
struct ccid3_hc_tx_sock {
|
|
struct tfrc_tx_info ccid3hctx_tfrc;
|
|
#define ccid3hctx_x ccid3hctx_tfrc.tfrctx_x
|
|
#define ccid3hctx_x_recv ccid3hctx_tfrc.tfrctx_x_recv
|
|
#define ccid3hctx_x_calc ccid3hctx_tfrc.tfrctx_x_calc
|
|
#define ccid3hctx_rtt ccid3hctx_tfrc.tfrctx_rtt
|
|
#define ccid3hctx_p ccid3hctx_tfrc.tfrctx_p
|
|
#define ccid3hctx_t_rto ccid3hctx_tfrc.tfrctx_rto
|
|
#define ccid3hctx_t_ipi ccid3hctx_tfrc.tfrctx_ipi
|
|
u16 ccid3hctx_s;
|
|
enum ccid3_hc_tx_states ccid3hctx_state:8;
|
|
u8 ccid3hctx_last_win_count;
|
|
ktime_t ccid3hctx_t_last_win_count;
|
|
struct timer_list ccid3hctx_no_feedback_timer;
|
|
ktime_t ccid3hctx_t_ld;
|
|
ktime_t ccid3hctx_t_nom;
|
|
u32 ccid3hctx_delta;
|
|
struct tfrc_tx_hist_entry *ccid3hctx_hist;
|
|
struct ccid3_options_received ccid3hctx_options_received;
|
|
};
|
|
|
|
static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
|
|
{
|
|
struct ccid3_hc_tx_sock *hctx = ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
|
|
BUG_ON(hctx == NULL);
|
|
return hctx;
|
|
}
|
|
|
|
/* TFRC receiver states */
|
|
enum ccid3_hc_rx_states {
|
|
TFRC_RSTATE_NO_DATA = 1,
|
|
TFRC_RSTATE_DATA,
|
|
TFRC_RSTATE_TERM = 127,
|
|
};
|
|
|
|
/** struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket
|
|
*
|
|
* @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448 4.3)
|
|
* @ccid3hcrx_rtt - Receiver estimate of rtt (non-standard)
|
|
* @ccid3hcrx_p - current loss event rate (RFC 3448 5.4)
|
|
* @ccid3hcrx_last_counter - Tracks window counter (RFC 4342, 8.1)
|
|
* @ccid3hcrx_state - receiver state, one of %ccid3_hc_rx_states
|
|
* @ccid3hcrx_bytes_recv - Total sum of DCCP payload bytes
|
|
* @ccid3hcrx_tstamp_last_feedback - Time at which last feedback was sent
|
|
* @ccid3hcrx_tstamp_last_ack - Time at which last feedback was sent
|
|
* @ccid3hcrx_hist - Packet history
|
|
* @ccid3hcrx_li_hist - Loss Interval History
|
|
* @ccid3hcrx_s - Received packet size in bytes
|
|
* @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
|
|
*/
|
|
struct ccid3_hc_rx_sock {
|
|
struct tfrc_rx_info ccid3hcrx_tfrc;
|
|
#define ccid3hcrx_x_recv ccid3hcrx_tfrc.tfrcrx_x_recv
|
|
#define ccid3hcrx_rtt ccid3hcrx_tfrc.tfrcrx_rtt
|
|
#define ccid3hcrx_p ccid3hcrx_tfrc.tfrcrx_p
|
|
u8 ccid3hcrx_last_counter:4;
|
|
enum ccid3_hc_rx_states ccid3hcrx_state:8;
|
|
u32 ccid3hcrx_bytes_recv;
|
|
ktime_t ccid3hcrx_tstamp_last_feedback;
|
|
struct tfrc_rx_hist ccid3hcrx_hist;
|
|
struct list_head ccid3hcrx_li_hist;
|
|
u16 ccid3hcrx_s;
|
|
u32 ccid3hcrx_pinv;
|
|
};
|
|
|
|
static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
|
|
BUG_ON(hcrx == NULL);
|
|
return hcrx;
|
|
}
|
|
|
|
#endif /* _DCCP_CCID3_H_ */
|