From: Alexei Starovoitov <ast@fb.com>
Date: Tue, 8 Mar 2016 05:57:18 +0000 (-0800)
Subject: samples/bpf: make map creation more verbose
X-Git-Tag: v4.6-rc1~91^2~108^2~3
X-Git-Url: http://git.cascardo.info/?a=commitdiff_plain;ds=sidebyside;h=618ec9a7b1fda46f8dd4a630ded983aeb51218f3;p=cascardo%2Flinux.git

samples/bpf: make map creation more verbose

map creation is typically the first one to fail when rlimits are
too low, not enough memory, etc
Make this failure scenario more verbose

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index da86a8e0a95a..816bca5760a0 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -158,8 +158,11 @@ static int load_maps(struct bpf_map_def *maps, int len)
 					   maps[i].key_size,
 					   maps[i].value_size,
 					   maps[i].max_entries);
-		if (map_fd[i] < 0)
+		if (map_fd[i] < 0) {
+			printf("failed to create a map: %d %s\n",
+			       errno, strerror(errno));
 			return 1;
+		}
 
 		if (maps[i].type == BPF_MAP_TYPE_PROG_ARRAY)
 			prog_array_fd = map_fd[i];