From bbf29d3a2e49e482d5267311798aec42f00e88f3 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Sat, 12 Jun 2021 08:05:01 +0530 Subject: [PATCH] libbpf: Set NLM_F_EXCL when creating qdisc This got lost during the refactoring across versions. We always use NLM_F_EXCL when creating some TC object, so reflect what the function says and set the flag. Fixes: 715c5ce454a6 ("libbpf: Add low level TC-BPF management API") Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20210612023502.1283837-3-memxor@gmail.com --- 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 efbb50ad59d8..cf9381f03b16 100644 --- a/tools/lib/bpf/netlink.c +++ b/tools/lib/bpf/netlink.c @@ -457,7 +457,7 @@ static int tc_qdisc_modify(struct bpf_tc_hook *hook, int cmd, int flags) static int tc_qdisc_create_excl(struct bpf_tc_hook *hook) { - return tc_qdisc_modify(hook, RTM_NEWQDISC, NLM_F_CREATE); + return tc_qdisc_modify(hook, RTM_NEWQDISC, NLM_F_CREATE | NLM_F_EXCL); } static int tc_qdisc_delete(struct bpf_tc_hook *hook) -- 2.11.0