/*
 * Copyright (c) 2011 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/crc8.h>
#include <linux/printk.h>

/*
 * crc8_populate_msb - fill crc table for given polynomial in reverse bit order.
 *
 * table:	table to be filled.
 * polynomial:	polynomial for which table is to be filled.
 */
void crc8_populate_msb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
{
	int i, j;
	const u8 msbit = 0x80;
	u8 t = msbit;

	table[0] = 0;

	for (i = 1; i < CRC8_TABLE_SIZE; i *= 2) {
		t = (t << 1) ^ (t & msbit ? polynomial : 0);
		for (j = 0; j < i; j++)
			table[i+j] = table[j] ^ t;
	}
}
EXPORT_SYMBOL(crc8_populate_msb);

/*
 * crc8_populate_lsb - fill crc table for given polynomial in regular bit order.
 *
 * table:	table to be filled.
 * polynomial:	polynomial for which table is to be filled.
 */
void crc8_populate_lsb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
{
	int i, j;
	u8 t = 1;

	table[0] = 0;

	for (i = (CRC8_TABLE_SIZE >> 1); i; i >>= 1) {
		t = (t >> 1) ^ (t & 1 ? polynomial : 0);
		for (j = 0; j < CRC8_TABLE_SIZE; j += 2*i)
			table[i+j] = table[j] ^ t;
	}
}
EXPORT_SYMBOL(crc8_populate_lsb);

/*
 * crc8 - calculate a crc8 over the given input data.
 *
 * table: crc table used for calculation.
 * pdata: pointer to data buffer.
 * nbytes: number of bytes in data buffer.
 * crc:	previous returned crc8 value.
 */
u8 crc8(const u8 table[CRC8_TABLE_SIZE], u8 *pdata, size_t nbytes, u8 crc)
{
	/* loop over the buffer data */
	while (nbytes-- > 0)
		crc = table[(crc ^ *pdata++) & 0xff];

	return crc;
}
EXPORT_SYMBOL(crc8);

MODULE_DESCRIPTION("CRC8 (by Williams, Ross N.) function");
MODULE_AUTHOR("Broadcom Corporation");
MODULE_LICENSE("Dual BSD/GPL");
table>
<div class='path'>path: <a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>root</a>/<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/drivers?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>drivers</a>/<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/drivers/net?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>net</a>/<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/drivers/net/phy?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>phy</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='a87ae8a963bde755b0962bcc18db83d611f63e7a'/><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>Russell King &lt;rmk+kernel@armlinux.org.uk&gt;</td><td class='right'>2020-02-15 15:49:27 +0000</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2020-02-16 19:39:44 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/drivers/net/phy?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>a87ae8a963bde755b0962bcc18db83d611f63e7a</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/patch/drivers/net/phy?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/tree/?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>9fa705afcdce8ca1555396d433e68b1ac918ed7a</a> /<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/tree/drivers/net/phy?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>drivers/net/phy</a></td></tr>
<tr><th>parent</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/drivers/net/phy?id=8062e2333f8f7dcd5627e22b99e18d1cbb53eedb'>8062e2333f8f7dcd5627e22b99e18d1cbb53eedb</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/drivers/net/phy?id=a87ae8a963bde755b0962bcc18db83d611f63e7a&amp;id2=8062e2333f8f7dcd5627e22b99e18d1cbb53eedb'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: add helpers to resolve negotiated flow control</div><div class='commit-msg'>Add a couple of helpers to resolve negotiated flow control. Two helpers
are provided:

- linkmode_resolve_pause() which takes the link partner and local
  advertisements, and decodes whether we should enable TX or RX pause
  at the MAC. This is useful outside of phylib, e.g. in phylink.
- phy_get_pause(), which returns the TX/RX enablement status for the
  current negotiation results of the PHY.

This allows us to centralise the flow control resolution, rather than
spreading it around.

Signed-off-by: Russell King &lt;rmk+kernel@armlinux.org.uk&gt;
Reviewed-by: Andrew Lunn &lt;andrew@lunn.ch&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=a87ae8a963bde755b0962bcc18db83d611f63e7a'>Diffstat</a> (limited to 'drivers/net/phy')</div><table summary='diffstat' class='diffstat'>