netdev - [PATCH bpf-next v1 7/7] tools: bpftool: add error message on map pinning failure

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Date:   Wed, 20 Mar 2019 18:33:32 +0100
From:   Alban Crequy <alban.crequy@...il.com>
To:     ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alban@...volk.io, iago@...volk.io
Subject: [PATCH bpf-next v1 7/7] tools: bpftool: add error message on map pinning failure

From: Alban Crequy <alban@...volk.io>

Symptoms, when "dir" does not exist:

$ sudo bpftool map create /sys/fs/bpf/dir/fooB type hash key 8 value 8 entries 8 name fooB flags 1
$ echo $?
255

This patch prints an error message when the map pinning fails.

Signed-off-by: Alban Crequy <alban@...volk.io>
---
 tools/bpf/bpftool/map.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 9befcabc299d..c825eb1bbf8f 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -1305,8 +1305,10 @@ static int do_create(int argc, char **argv)
 
 	err = do_pin_fd(fd, pinfile);
 	close(fd);
-	if (err)
+	if (err) {
+		p_err("failed to pin map to %s", pinfile);
 		return err;
+	}
 
 	if (json_output)
 		jsonw_null(json_wtr);
-- 
2.20.1