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tools: bpftool: move get_possible_cpus() to common code

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Move the get_possible_cpus() function to shared code.  No functional
changes.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski
2018-05-03 18:37:15 -07:00
committed by Daniel Borkmann
parent c642ea2654
commit e64d52569f
3 changed files with 59 additions and 58 deletions
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58
tools/bpf/bpftool/common.c
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@@ -1,5 +1,5 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
* Copyright (C) 2017-2018 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
@@ -33,6 +33,7 @@
/* Author: Jakub Kicinski <kubakici@wp.pl> */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
@@ -420,6 +421,61 @@ void delete_pinned_obj_table(struct pinned_obj_table *tab)
}
}
unsigned int get_possible_cpus(void)
{
static unsigned int result;
char buf[128];
long int n;
char *ptr;
int fd;
if (result)
return result;
fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
if (fd < 0) {
p_err("can't open sysfs possible cpus");
exit(-1);
}
n = read(fd, buf, sizeof(buf));
if (n < 2) {
p_err("can't read sysfs possible cpus");
exit(-1);
}
close(fd);
if (n == sizeof(buf)) {
p_err("read sysfs possible cpus overflow");
exit(-1);
}
ptr = buf;
n = 0;
while (*ptr && *ptr != '\n') {
unsigned int a, b;
if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
n += b - a + 1;
ptr = strchr(ptr, '-') + 1;
} else if (sscanf(ptr, "%u", &a) == 1) {
n++;
} else {
assert(0);
}
while (isdigit(*ptr))
ptr++;
if (*ptr == ',')
ptr++;
}
result = n;
return result;
}
static char *
ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
{