netdev - [PATCH iproute2 1/2] vrf: print BPF log buffer if bpf_program

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Message-Id: <20210117225427.29658-1-bluca@debian.org>
Date:   Sun, 17 Jan 2021 22:54:26 +0000
From:   Luca Boccassi <bluca@...ian.org>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org
Subject: [PATCH iproute2 1/2] vrf: print BPF log buffer if bpf_program_load fails

Necessary to understand what is going on when bpf_program_load fails

Signed-off-by: Luca Boccassi <bluca@...ian.org>
---
 ip/ipvrf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ip/ipvrf.c b/ip/ipvrf.c
index 42779e5c..91578031 100644
--- a/ip/ipvrf.c
+++ b/ip/ipvrf.c
@@ -278,8 +278,8 @@ static int vrf_configure_cgroup(const char *path, int ifindex)
 	 */
 	prog_fd = prog_load(ifindex);
 	if (prog_fd < 0) {
-		fprintf(stderr, "Failed to load BPF prog: '%s'\n",
-			strerror(errno));
+		fprintf(stderr, "Failed to load BPF prog: '%s'\n%s",
+			strerror(errno), bpf_log_buf);
 
 		if (errno != EPERM) {
 			fprintf(stderr,
-- 
2.29.2