/*
 *  Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
 *
 *  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_CCID2_H_
#define _DCCP_CCID2_H_

#include <linux/timer.h>
#include <linux/types.h>
#include "../ccid.h"
#include "../dccp.h"

/*
 * CCID-2 timestamping faces the same issues as TCP timestamping.
 * Hence we reuse/share as much of the code as possible.
 */
#define ccid2_time_stamp	tcp_time_stamp

/* NUMDUPACK parameter from RFC 4341, p. 6 */
#define NUMDUPACK	3

struct ccid2_seq {
	u64			ccid2s_seq;
	u32			ccid2s_sent;
	int			ccid2s_acked;
	struct ccid2_seq	*ccid2s_prev;
	struct ccid2_seq	*ccid2s_next;
};

#define CCID2_SEQBUF_LEN 1024
#define CCID2_SEQBUF_MAX 128

/*
 * Multiple of congestion window to keep the sequence window at
 * (RFC 4340 7.5.2)
 */
#define CCID2_WIN_CHANGE_FACTOR 5

/**
 * struct ccid2_hc_tx_sock - CCID2 TX half connection
 * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
 * @tx_packets_acked:	     Ack counter for deriving cwnd growth (RFC 3465)
 * @tx_srtt:		     smoothed RTT estimate, scaled by 2^3
 * @tx_mdev:		     smoothed RTT variation, scaled by 2^2
 * @tx_mdev_max:	     maximum of @mdev during one flight
 * @tx_rttvar:		     moving average/maximum of @mdev_max
 * @tx_rto:		     RTO value deriving from SRTT and RTTVAR (RFC 2988)
 * @tx_rtt_seq:		     to decay RTTVAR at most once per flight
 * @tx_cwnd_used:	     actually used cwnd, W_used of RFC 2861
 * @tx_expected_wnd:	     moving average of @tx_cwnd_used
 * @tx_cwnd_stamp:	     to track idle periods in CWV
 * @tx_lsndtime:	     last time (in jiffies) a data packet was sent
 * @tx_rpseq:		     last consecutive seqno
 * @tx_rpdupack:	     dupacks since rpseq
 * @tx_av_chunks:	     list of Ack Vectors received on current skb
 */
struct ccid2_hc_tx_sock {
	u32			tx_cwnd;
	u32			tx_ssthresh;
	u32			tx_pipe;
	u32			tx_packets_acked;
	struct ccid2_seq	*tx_seqbuf[CCID2_SEQBUF_MAX];
	int			tx_seqbufc;
	struct ccid2_seq	*tx_seqh;
	struct ccid2_seq	*tx_seqt;

	/* RTT measurement: variables/principles are the same as in TCP */
	u32			tx_srtt,
				tx_mdev,
				tx_mdev_max,
				tx_rttvar,
				tx_rto;
	u64			tx_rtt_seq:48;
	struct timer_list	tx_rtotimer;

	/* Congestion Window validation (optional, RFC 2861) */
	u32			tx_cwnd_used,
				tx_expected_wnd,
				tx_cwnd_stamp,
				tx_lsndtime;

	u64			tx_rpseq;
	int			tx_rpdupack;
	u32			tx_last_cong;
	u64			tx_high_ack;
	struct list_head	tx_av_chunks;
};

static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
{
	return hc->tx_pipe >= hc->tx_cwnd;
}

/*
 * Convert RFC 3390 larger initial window into an equivalent number of packets.
 * This is based on the numbers specified in RFC 5681, 3.1.
 */
static inline u32 rfc3390_bytes_to_packets(const u32 smss)
{
	return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
}

/**
 * struct ccid2_hc_rx_sock  -  Receiving end of CCID-2 half-connection
 * @rx_num_data_pkts: number of data packets received since last feedback
 */
struct ccid2_hc_rx_sock {
	u32	rx_num_data_pkts;
};

static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
{
	return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
}

static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
{
	return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
}
#endif /* _DCCP_CCID2_H_ */
n value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-16 09:34:37 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-16 09:34:37 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ax88796.h?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/ax88796.h?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>4d8ea8e6ca52f1938269937834641205d8d888f0</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/ax88796.h?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>include/net/ax88796.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ax88796.h?h=nds-private-remove&amp;id=49def1853334396f948dcb4cedb9347abb318df5'>49def1853334396f948dcb4cedb9347abb318df5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/ax88796.h?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc&amp;id2=49def1853334396f948dcb4cedb9347abb318df5'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ax88796.h?h=nds-private-remove&amp;id=ce1ca7d2d140a1f4aaffd297ac487f246963dd2f'>ce1ca7d2d140a1f4aaffd297ac487f246963dd2f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/ax88796.h?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc&amp;id2=ce1ca7d2d140a1f4aaffd297ac487f246963dd2f'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'nfsd-4.10-1' of git://linux-nfs.org/~bfields/linux</div><div class='commit-msg'>Pull nfsd fixes from Bruce Fields:
 "Miscellaneous nfsd bugfixes, one for a 4.10 regression, three for
  older bugs"

* tag 'nfsd-4.10-1' of git://linux-nfs.org/~bfields/linux:
  svcrdma: avoid duplicate dma unmapping during error recovery
  sunrpc: don't call sleeping functions from the notifier block callbacks
  svcrpc: don't leak contexts on PROC_DESTROY
  nfsd: fix supported attributes for acl &amp; labels
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>Diffstat</a> (limited to 'include/net/ax88796.h')</div><table summary='diffstat' class='diffstat'>