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

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Message-ID: <87imo9roxf.fsf@toke.dk>
Date:   Mon, 28 Oct 2019 14:15:56 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, brouer@...hat.com
Subject: Re: [PATCH bpf-next v3 4/4] selftests: Add tests for automatic map pinning

Jesper Dangaard Brouer <brouer@...hat.com> writes:

> On Sun, 27 Oct 2019 21:53:19 +0100
> Toke Høiland-Jørgensen <toke@...hat.com> 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?

No idea what the minimum version is. I'm running LLVM 9.0 :)

> Or was there a dependency on pahole?

Don't think so...

-Toke