On Tue, Jan 11, 2022 at 11:34:25PM +0530, Kumar Kartikeya Dwivedi wrote:

+
+#define nf_ct_test(func, ctx)                                                  \
+	({                                                                     \
+		struct bpf_ct_opts opts_def = { .l4proto = IPPROTO_TCP,        \
+						.netns_id = -1 };              \
+		struct bpf_sock_tuple bpf_tuple;                               \
+		struct nf_conn *ct;                                            \
+		__builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4));       \
+		ct = func(ctx, NULL, 0, &opts_def, sizeof(opts_def));          \

Have you tried converting the macro to static always_inline
and passing func as a pointer to a function?
The first argument 'ctx' is different, but if you prototype it
in this static inline as (*fn)(void *ctx)
and type case it later in nf_skb/xdp_ct_test() that should still work?