Re: [PATCH bpf-next v2 3/3] selftests/bpf: Test FOU kfuncs for externally controlled ipip devices

[Alexei Starovoitov]

On Mon, Apr 03, 2023 at 02:12:09PM +0200, Christian Ehrig wrote:
> +
> +SEC("tc")
> +int ipip_encap_get_tunnel(struct __sk_buff *skb)
> +{
> +	int ret;
> +	struct bpf_tunnel_key key = {};
> +	struct bpf_fou_encap encap = {};
> +
> +	ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
> +	if (ret < 0) {
> +		log_err(ret);
> +		return TC_ACT_SHOT;
> +	}
> +
> +	ret = bpf_skb_get_fou_encap(skb, &encap);
> +	if (ret < 0) {
> +		log_err(ret);
> +		return TC_ACT_SHOT;
> +	}
> +
> +	if (bpf_ntohs(encap.dport) != 5555)
> +		return TC_ACT_SHOT;
> +
> +	bpf_printk("%d remote ip 0x%x, sport %d, dport %d\n", ret,
> +		   key.remote_ipv4, bpf_ntohs(encap.sport),
> +		   bpf_ntohs(encap.dport));
> +	return TC_ACT_OK;
> +}
> +
>  SEC("tc")
>  int ipip6_set_tunnel(struct __sk_buff *skb)
>  {
> diff --git a/tools/testing/selftests/bpf/test_tunnel.sh b/tools/testing/selftests/bpf/test_tunnel.sh
> index 2dec7dbf29a2..f2379414a887 100755
> --- a/tools/testing/selftests/bpf/test_tunnel.sh
> +++ b/tools/testing/selftests/bpf/test_tunnel.sh

All looks good to me, but please integrate the selftest into test_progs.
test_tunnel is obsolete. BPF CI doesn't run it and maintainers don't do either.