#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "irq.h"
#include "str.h"
#include "die.h"

int device_irq_number(const char *ifname)
{
	int irq = 0;
	char buff[128], sysname[128];
	FILE *fp;

	if (!strncmp("lo", ifname, strlen("lo")))
		return 0;

	slprintf(sysname, sizeof(sysname),
		 "/sys/class/net/%s/device/irq",
		 ifname);

	fp = fopen(sysname, "r");
	if (!fp)
		return -ENOENT;

	memset(buff, 0, sizeof(buff));

	if (fgets(buff, sizeof(buff), fp) != NULL) {
		buff[sizeof(buff) - 1] = 0;
		irq = atoi(buff);
	}

	fclose(fp);
	return irq;
}

static char nic_irq_affinity_list[128];
static bool nic_irq_stored = false;
static int  nic_irq = -1;

static void device_save_irq_affinity_list(void)
{
	int ret, fd;
	char file[128];

	bug_on(nic_irq_stored);

	slprintf(file, sizeof(file),
		 "/proc/irq/%d/smp_affinity_list", nic_irq);

	fd = open(file, O_RDONLY);
	if (fd < 0)
		return;

	memset(nic_irq_affinity_list, 0, sizeof(nic_irq_affinity_list));

	ret = read(fd, nic_irq_affinity_list,
		   sizeof(nic_irq_affinity_list));
	if (ret < 0)
		panic("Cannot store NIC IRQ affinity!\n");

	close(fd);

	nic_irq_stored = true;
}

void device_restore_irq_affinity_list(void)
{
	int ret, fd;
	char file[128];

	if (!nic_irq_stored)
		return;

	bug_on(nic_irq == -1);

	slprintf(file, sizeof(file),
		 "/proc/irq/%d/smp_affinity_list", nic_irq);

	fd = open(file, O_WRONLY);
	if (fd < 0)
		return;

	ret = write(fd, nic_irq_affinity_list,
		    sizeof(nic_irq_affinity_list));
	if (ret < 0)
		panic("Cannot restore NIC IRQ affinity!\n");

	close(fd);
}

int device_set_irq_affinity_list(int irq, unsigned long from, unsigned long to)
{
	int ret, fd;
	char file[128], list[64];

	if (unlikely(irq == 0))
		return 0;
	if (!nic_irq_stored) {
		nic_irq = irq;
		device_save_irq_affinity_list();
	}

	slprintf(file, sizeof(file), "/proc/irq/%d/smp_affinity_list", irq);
	slprintf(list, sizeof(list), "%lu-%lu\n", from, to);

	fd = open(file, O_WRONLY);
	if (fd < 0)
		return -ENOENT;

	ret = write(fd, list, strlen(list));

	close(fd);
	return ret;
}

int device_set_irq_affinity(int irq, unsigned long cpu)
{
	return device_set_irq_affinity_list(irq, cpu, cpu);
}
7402cc9254b2bc8da359a0347d75'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/testing/selftests/sync'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/diff/?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>root</a>/<a href='/cgit.cgi/linux/net-next.git/diff/tools?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>testing</a>/<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>selftests</a>/<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/sync?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>sync</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='c92816275674c1491ce228ee49aa030a5fa1be04'/><input type='hidden' name='id2' value='c8a6a09c1c617402cc9254b2bc8da359a0347d75'/><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><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c92816275674c1491ce228ee49aa030a5fa1be04&amp;id2=c8a6a09c1c617402cc9254b2bc8da359a0347d75'>Diffstat</a> (limited to 'tools/testing/selftests/sync')</div><table summary='diffstat' class='diffstat'>