netdev - [PATCH bpf-next v2 2/2] samples: bpf: get ifindex from ifname

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Message-Id: <20181201002306.25834-3-mcroce@redhat.com>
Date:   Sat,  1 Dec 2018 01:23:06 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Y Song <ys114321@...il.com>
Subject: [PATCH bpf-next v2 2/2] samples: bpf: get ifindex from ifname

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

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
v2: use if_nametoindex() instead of ioctl()

 samples/bpf/xdp1_user.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index 4f3d824fc044..0a197f86ac43 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -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;
-- 
2.19.1