netdev - [PATCH bpf-next] libbpf: always use libbpf_err to return an error in bpf_xdp

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Date:   Tue,  7 Feb 2023 12:11:03 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com, lorenzo.bianconi@...hat.com
Subject: [PATCH bpf-next] libbpf: always use libbpf_err to return an error in bpf_xdp_query()

In order to properly set errno, rely on libbpf_err utility routine in
bpf_xdp_query() to return an error to the caller.

Fixes: 04d58f1b26a4 ("libbpf: add API to get XDP/XSK supported features")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 tools/lib/bpf/netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c
index 32b13b7a11b0..cb082a04ffa8 100644
--- a/tools/lib/bpf/netlink.c
+++ b/tools/lib/bpf/netlink.c
@@ -480,7 +480,7 @@ int bpf_xdp_query(int ifindex, int xdp_flags, struct bpf_xdp_query_opts *opts)
 
 	err = nlattr_add(&req, NETDEV_A_DEV_IFINDEX, &ifindex, sizeof(ifindex));
 	if (err < 0)
-		return err;
+		return libbpf_err(err);
 
 	err = libbpf_netlink_send_recv(&req, NETLINK_GENERIC,
 				       parse_xdp_features, NULL, &md);
-- 
2.39.1