linux-kernel - [PATCH bpf-next 3/5] libbpf: allow to set coookie when target_btf_id is set in bpf_link

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Date: Tue, 20 Feb 2024 11:51:03 +0800
From: Menglong Dong <dongmenglong.8@...edance.com>
To: andrii@...nel.org
Cc: ast@...nel.org,
	daniel@...earbox.net,
	martin.lau@...ux.dev,
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	song@...nel.org,
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Subject: [PATCH bpf-next 3/5] libbpf: allow to set coookie when target_btf_id is set in bpf_link_create

As now we support to attach the tracing program to multiple target, we can
set the bpf cookie even if the target btf id is offered in
bpf_link_create().

Signed-off-by: Menglong Dong <dongmenglong.8@...edance.com>
---
 tools/lib/bpf/bpf.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 97ec005c3c47..0ca7c8375b40 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -737,23 +737,15 @@ int bpf_link_create(int prog_fd, int target_fd,
 	target_btf_id = OPTS_GET(opts, target_btf_id, 0);
 
 	/* validate we don't have unexpected combinations of non-zero fields */
-	if (iter_info_len || target_btf_id) {
-		if (iter_info_len && target_btf_id)
-			return libbpf_err(-EINVAL);
-		if (!OPTS_ZEROED(opts, target_btf_id))
-			return libbpf_err(-EINVAL);
-	}
+	if (iter_info_len && target_btf_id)
+		return libbpf_err(-EINVAL);
 
 	memset(&attr, 0, attr_sz);
 	attr.link_create.prog_fd = prog_fd;
 	attr.link_create.target_fd = target_fd;
 	attr.link_create.attach_type = attach_type;
 	attr.link_create.flags = OPTS_GET(opts, flags, 0);
-
-	if (target_btf_id) {
-		attr.link_create.target_btf_id = target_btf_id;
-		goto proceed;
-	}
+	attr.link_create.target_btf_id = target_btf_id;
 
 	switch (attach_type) {
 	case BPF_TRACE_ITER:
@@ -834,11 +826,10 @@ int bpf_link_create(int prog_fd, int target_fd,
 			return libbpf_err(-EINVAL);
 		break;
 	default:
-		if (!OPTS_ZEROED(opts, flags))
+		if (!target_btf_id && !OPTS_ZEROED(opts, flags))
 			return libbpf_err(-EINVAL);
 		break;
 	}
-proceed:
 	fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, attr_sz);
 	if (fd >= 0)
 		return fd;
-- 
2.39.2