/*
 * 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.
 *
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/gfp.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>

/*
 *	This procedure is passed a buffer descriptor for an iframe. It builds
 *	the rest of the control part of the frame and then writes it out.
 */
static void rose_send_iframe(struct sock *sk, struct sk_buff *skb)
{
	struct rose_sock *rose = rose_sk(sk);

	if (skb == NULL)
		return;

	skb->data[2] |= (rose->vr << 5) & 0xE0;
	skb->data[2] |= (rose->vs << 1) & 0x0E;

	rose_start_idletimer(sk);

	rose_transmit_link(skb, rose->neighbour);
}

void rose_kick(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);
	struct sk_buff *skb, *skbn;
	unsigned short start, end;

	if (rose->state != ROSE_STATE_3)
		return;

	if (rose->condition & ROSE_COND_PEER_RX_BUSY)
		return;

	if (!skb_peek(&sk->sk_write_queue))
		return;

	start = (skb_peek(&rose->ack_queue) == NULL) ? rose->va : rose->vs;
	end   = (rose->va + sysctl_rose_window_size) % ROSE_MODULUS;

	if (start == end)
		return;

	rose->vs = start;

	/*
	 * Transmit data until either we're out of data to send or
	 * the window is full.
	 */

	skb  = skb_dequeue(&sk->sk_write_queue);

	do {
		if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
			skb_queue_head(&sk->sk_write_queue, skb);
			break;
		}

		skb_set_owner_w(skbn, sk);

		/*
		 * Transmit the frame copy.
		 */
		rose_send_iframe(sk, skbn);

		rose->vs = (rose->vs + 1) % ROSE_MODULUS;

		/*
		 * Requeue the original data frame.
		 */
		skb_queue_tail(&rose->ack_queue, skb);

	} while (rose->vs != end &&
		 (skb = skb_dequeue(&sk->sk_write_queue)) != NULL);

	rose->vl         = rose->vr;
	rose->condition &= ~ROSE_COND_ACK_PENDING;

	rose_stop_timer(sk);
}

/*
 * The following routines are taken from page 170 of the 7th ARRL Computer
 * Networking Conference paper, as is the whole state machine.
 */

void rose_enquiry_response(struct sock *sk)
{
	struct rose_sock *rose = rose_sk(sk);

	if (rose->condition & ROSE_COND_OWN_RX_BUSY)
		rose_write_internal(sk, ROSE_RNR);
	else
		rose_write_internal(sk, ROSE_RR);

	rose->vl         = rose->vr;
	rose->condition &= ~ROSE_COND_ACK_PENDING;

	rose_stop_timer(sk);
}
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</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>uapi</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>asm-generic</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/socket.h?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>socket.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='eeeefd41843218c55a8782a6920f044d9bf6207a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option 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>Christoph Hellwig &lt;hch@lst.de&gt;</td><td class='right'>2017-02-05 18:10:35 +0100</td></tr>
<tr><th>committer</th><td>Jens Axboe &lt;axboe@fb.com&gt;</td><td class='right'>2017-02-06 09:34:46 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/socket.h?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>eeeefd41843218c55a8782a6920f044d9bf6207a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/uapi/asm-generic/socket.h?id=eeeefd41843218c55a8782a6920f044d9bf6207a'>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=eeeefd41843218c55a8782a6920f044d9bf6207a'>c342eac46626e62745aa8e1a982626efca8b121d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi/asm-generic/socket.h?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>include/uapi/asm-generic/socket.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/socket.h?h=nds-private-remove&amp;id=c14024dbb156c8392908aaa822097d27c6af8ec8'>c14024dbb156c8392908aaa822097d27c6af8ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/asm-generic/socket.h?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a&amp;id2=c14024dbb156c8392908aaa822097d27c6af8ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>block: don't try Write Same from __blkdev_issue_zeroout</div><div class='commit-msg'>Write Same can return an error asynchronously if it turns out the
underlying SCSI device does not support Write Same, which makes a
proper fallback to other methods in __blkdev_issue_zeroout impossible.
Thus only issue a Write Same from blkdev_issue_zeroout an don't try it
at all from __blkdev_issue_zeroout as a non-invasive workaround.

Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reported-by: Junichi Nomura &lt;j-nomura@ce.jp.nec.com&gt;
Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout")
Tested-by: Junichi Nomura &lt;j-nomura@ce.jp.nec.com&gt;
Signed-off-by: Jens Axboe &lt;axboe@fb.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=eeeefd41843218c55a8782a6920f044d9bf6207a'>Diffstat</a> (limited to 'include/uapi/asm-generic/socket.h')</div><table summary='diffstat' class='diffstat'>