/* Tom Kelly's Scalable TCP
 *
 * See http://www.deneholme.net/tom/scalable/
 *
 * John Heffner <jheffner@sc.edu>
 */

#include <linux/module.h>
#include <net/tcp.h>

/* These factors derived from the recommended values in the aer:
 * .01 and and 7/8. We use 50 instead of 100 to account for
 * delayed ack.
 */
#define TCP_SCALABLE_AI_CNT	50U
#define TCP_SCALABLE_MD_SCALE	3

struct scalable {
	u32 loss_cwnd;
};

static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 acked)
{
	struct tcp_sock *tp = tcp_sk(sk);

	if (!tcp_is_cwnd_limited(sk))
		return;

	if (tcp_in_slow_start(tp))
		tcp_slow_start(tp, acked);
	else
		tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT),
				  1);
}

static u32 tcp_scalable_ssthresh(struct sock *sk)
{
	const struct tcp_sock *tp = tcp_sk(sk);
	struct scalable *ca = inet_csk_ca(sk);

	ca->loss_cwnd = tp->snd_cwnd;

	return max(tp->snd_cwnd - (tp->snd_cwnd>>TCP_SCALABLE_MD_SCALE), 2U);
}

static u32 tcp_scalable_cwnd_undo(struct sock *sk)
{
	const struct scalable *ca = inet_csk_ca(sk);

	return max(tcp_sk(sk)->snd_cwnd, ca->loss_cwnd);
}

static struct tcp_congestion_ops tcp_scalable __read_mostly = {
	.ssthresh	= tcp_scalable_ssthresh,
	.undo_cwnd	= tcp_scalable_cwnd_undo,
	.cong_avoid	= tcp_scalable_cong_avoid,

	.owner		= THIS_MODULE,
	.name		= "scalable",
};

static int __init tcp_scalable_register(void)
{
	return tcp_register_congestion_control(&tcp_scalable);
}

static void __exit tcp_scalable_unregister(void)
{
	tcp_unregister_congestion_control(&tcp_scalable);
}

module_init(tcp_scalable_register);
module_exit(tcp_scalable_unregister);

MODULE_AUTHOR("John Heffner");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Scalable TCP");
><a href='/cgit.cgi/linux/net-next.git/tree/net/ethernet/eth.c?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/net/ethernet/eth.c?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/ethernet/eth.c?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/ethernet/eth.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ethernet?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>ethernet</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ethernet/eth.c?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3'>eth.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/ethernet/eth.c?id=0b57010fc18e12c19d14379cd739d4eb7c3898f3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Shenwei Wang &lt;shenwei.wang@freescale.com&gt;</td><td class='right'>2015-08-24 14:04:15 -0500</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2015-08-24 21:49:34 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=e324c4dc4a5991d5b1171f434884a4026345e4b4'>e324c4dc4a5991d5b1171f434884a4026345e4b4</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation?id=e324c4dc4a5991d5b1171f434884a4026345e4b4'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=e324c4dc4a5991d5b1171f434884a4026345e4b4'>7eafdc7f1b97f201d85e5dd7c67695886c5412cb</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation?id=e324c4dc4a5991d5b1171f434884a4026345e4b4'>Documentation</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=1a15aaa998dc3b51f7f8b9a820bc7a192a0c2f76'>1a15aaa998dc3b51f7f8b9a820bc7a192a0c2f76</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation?id=e324c4dc4a5991d5b1171f434884a4026345e4b4&amp;id2=1a15aaa998dc3b51f7f8b9a820bc7a192a0c2f76'>diff</a>)</td></tr></table>
<div class='commit-subject'>irqchip/imx-gpcv2: IMX GPCv2 driver for wakeup sources</div><div class='commit-msg'>IMX7D contains a new version of GPC IP block (GPCv2). It has two major
functions: power management and wakeup source management.

When the system is in WFI (wait for interrupt) mode, the GPC block
will be the first block on the platform to be activated and signaled.

In normal wait mode during cpu idle, the system can be woken up by any
enabled interrupts. In standby or suspend mode, the system can only be
wokem up by the pre-defined wakeup sources.

Based-on-patch-by: Anson Huang &lt;b20788@freescale.com&gt;
Signed-off-by: Shenwei Wang &lt;shenwei.wang@freescale.com&gt;
Cc: &lt;linux-arm-kernel@lists.infradead.org&gt;
Cc: &lt;shawn.guo@linaro.org&gt;
Cc: &lt;jason@lakedaemon.net&gt;
Link: http://lkml.kernel.org/r/1440443055-7291-1-git-send-email-shenwei.wang@freescale.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=e324c4dc4a5991d5b1171f434884a4026345e4b4'>Diffstat</a> (limited to 'Documentation')</div><table summary='diffstat' class='diffstat'>