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samples: bpf: get ifindex from ifname 

Find the ifindex with if_nametoindex() instead of requiring the
numeric ifindex.

Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Matteo Croce 2018-12-01 01:23:06 +01:00 committed by Alexei Starovoitov
parent d606ee5c1d
commit dc378a1ab5
1 changed files with 7 additions and 2 deletions
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9
samples/bpf/xdp1_user.c
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@ -15,6 +15,7 @@
#include <unistd.h>
#include <libgen.h>
#include <sys/resource.h>
#include <net/if.h>
#include "bpf_util.h"
#include "bpf/bpf.h"
@ -59,7 +60,7 @@ static void poll_stats(int map_fd, int interval)
static void usage(const char *prog)
{
fprintf(stderr,
"usage: %s [OPTS] IFINDEX\n\n"
"usage: %s [OPTS] IFACE\n\n"
"OPTS:\n"
" -S use skb-mode\n"
" -N enforce native mode\n",
@ -102,7 +103,11 @@ int main(int argc, char **argv)
return 1;
}
ifindex = strtoul(argv[optind], NULL, 0);
ifindex = if_nametoindex(argv[1]);
if (!ifindex) {
perror("if_nametoindex");
return 1;
}
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
prog_load_attr.file = filename;