Subject: Re: [PATCH bpf-next v3 4/4] selftests: Add tests for automatic map pinning

From: Jesper Dangaard Brouer <[email-masked]>
Date: Mon, 28 Oct 2019 14:06:24 +0100

On Sun, 27 Oct 2019 21:53:19 +0100
Toke Høiland-Jørgensen <[email-masked]> wrote:

> diff --git a/tools/testing/selftests/bpf/progs/test_pinning.c b/tools/testing/selftests/bpf/progs/test_pinning.c
> new file mode 100644
> index 000000000000..ff2d7447777e
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_pinning.c
> @@ -0,0 +1,29 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/bpf.h>
> +#include "bpf_helpers.h"
> +
> +int _version SEC("version") = 1;
> +
> +struct {
> +	__uint(type, BPF_MAP_TYPE_ARRAY);
> +	__uint(max_entries, 1);
> +	__type(key, __u32);
> +	__type(value, __u64);
> +	__uint(pinning, LIBBPF_PIN_BY_NAME);
> +} pinmap SEC(".maps");

So, this is the new BTF-defined maps syntax.

Please remind me, what version of LLVM do we need to compile this?

Or was there a dependency on pahole?

> +struct {
> +	__uint(type, BPF_MAP_TYPE_ARRAY);
> +	__uint(max_entries, 1);
> +	__type(key, __u32);
> +	__type(value, __u64);
> +} nopinmap SEC(".maps");
> +
> +SEC("xdp_prog")
> +int _xdp_prog(struct xdp_md *xdp)
> +{
> +	return XDP_PASS;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> 

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer