#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);
}
te-remove'/><input type='hidden' name='id' value='ebc05ba7e8600b52a2a0c87a43105143368aca2a'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<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/?h=nds-private-remove&amp;id=ebc05ba7e8600b52a2a0c87a43105143368aca2a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2017-02-11 20:59:41 -0500'>2017-02-11</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=ebc05ba7e8600b52a2a0c87a43105143368aca2a'>tap: Tap character device creation/destroy API</a></td><td>Sainath Grandhi</td><td>3</td><td><span class='deletions'>-32</span>/<span class='insertions'>+63</span></td></tr>
<tr><td><span title='2017-02-11 20:59:41 -0500'>2017-02-11</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=635b8c8ecdd27142d7fdab0df334b2e9201481cf'>tap: Renaming tap related APIs, data structures, macros</a></td><td>Sainath Grandhi</td><td>6</td><td><span class='deletions'>-201</span>/<span class='insertions'>+202</span></td></tr>
<tr><td><span title='2017-02-11 20:59:41 -0500'>2017-02-11</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=a8e04698732736f59fefe72c675791a006b76e1d'>tap: Refactoring macvtap.c</a></td><td>Sainath Grandhi