netdev - [RFC bpf-next 2/7] bpf: resolve single typedef when walking structs

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Message-ID: <20230612172307.3923165-3-sdf@google.com>
Date: Mon, 12 Jun 2023 10:23:02 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com, 
	kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org, 
	netdev@...r.kernel.org
Subject: [RFC bpf-next 2/7] bpf: resolve single typedef when walking structs

It is impossible to use skb_frag_t in the tracing program. So let's
resolve a single typedef when walking the struct.

Cc: netdev@...r.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 kernel/bpf/btf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index bd2cac057928..9bdaa1225e8a 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6140,6 +6140,8 @@ static int btf_struct_walk(struct bpf_verifier_log *log, const struct btf *btf,
 	*flag = 0;
 again:
 	tname = __btf_name_by_offset(btf, t->name_off);
+	if (btf_type_is_typedef(t))
+		t = btf_type_by_id(btf, t->type);
 	if (!btf_type_is_struct(t)) {
 		bpf_log(log, "Type '%s' is not a struct\n", tname);
 		return -EINVAL;
-- 
2.41.0.162.gfafddb0af9-goog