netdev - Re: [PATCH v2 bpf-next 07/17] selftests/bpf: Add test for BPF trampoline

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Date:   Fri, 8 Nov 2019 01:17:50 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     David Miller <davem@...emloft.net>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "x86@...nel.org" <x86@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 07/17] selftests/bpf: Add test for BPF
 trampoline



> On Nov 6, 2019, at 9:46 PM, Alexei Starovoitov <ast@...nel.org> wrote:
> 
> Add sanity test for BPF trampoline that checks kernel functions
> with up to 6 arguments of different sizes.
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> ---
> tools/lib/bpf/bpf_helpers.h                   | 13 +++
> .../selftests/bpf/prog_tests/fentry_test.c    | 64 +++++++++++++
> .../testing/selftests/bpf/progs/fentry_test.c | 90 +++++++++++++++++++
> 3 files changed, 167 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/fentry_test.c
> create mode 100644 tools/testing/selftests/bpf/progs/fentry_test.c
> 
> diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
> index 0c7d28292898..c63ab1add126 100644
> --- a/tools/lib/bpf/bpf_helpers.h
> +++ b/tools/lib/bpf/bpf_helpers.h
> @@ -44,4 +44,17 @@ enum libbpf_pin_type {
> 	LIBBPF_PIN_BY_NAME,
> };
> 
> +/* The following types should be used by BPF_PROG_TYPE_TRACING program to
> + * access kernel function arguments. BPF trampoline and raw tracepoints
> + * typecast arguments to 'unsigned long long'.
> + */
> +typedef int __attribute__((aligned(8))) ks32;
> +typedef char __attribute__((aligned(8))) ks8;
> +typedef short __attribute__((aligned(8))) ks16;
> +typedef long long __attribute__((aligned(8))) ks64;
> +typedef unsigned int __attribute__((aligned(8))) ku32;
> +typedef unsigned char __attribute__((aligned(8))) ku8;
> +typedef unsigned short __attribute__((aligned(8))) ku16;
> +typedef unsigned long long __attribute__((aligned(8))) ku64;
> +
> #endif

Maybe a separate patch for bpf_helpers.h?

Otherwise, 

Acked-by: Song Liu <songliubraving@...com>