linux-kernel - Re: [PATCH bpf-next v3 2/2] selftests/bpf: Augment send

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Message-ID: <mb61po73wcdtp.fsf@kernel.org>
Date: Mon, 07 Oct 2024 12:11:46 +0000
From: Puranjay Mohan <puranjay@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai
 Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 2/2] selftests/bpf: Augment send_signal test
 with remote signaling

Puranjay Mohan <puranjay@...nel.org> writes:

> Add testcases to test bpf_send_signal_task(). In these new test cases,
> the main process triggers the BPF program and the forked process
> receives the signals. The target process's signal handler receives a
> cookie from the bpf program.
>
> Signed-off-by: Puranjay Mohan <puranjay@...nel.org>
> ---
>  .../selftests/bpf/prog_tests/send_signal.c    | 133 +++++++++++++-----
>  .../bpf/progs/test_send_signal_kern.c         |  35 ++++-
>  2 files changed, 130 insertions(+), 38 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/send_signal.c b/tools/testing/selftests/bpf/prog_tests/send_signal.c
> index 6cc69900b3106..beb771347a503 100644
> --- a/tools/testing/selftests/bpf/prog_tests/send_signal.c
> +++ b/tools/testing/selftests/bpf/prog_tests/send_signal.c
> @@ -8,17 +8,25 @@ static int sigusr1_received;
>  
>  static void sigusr1_handler(int signum)
>  {
> -	sigusr1_received = 1;
> +	sigusr1_received = 8;
> +}
> +
> +static void sigusr1_siginfo_handler(int s, siginfo_t *i, void *v)
> +{
> +	sigusr1_received = i->si_value.sival_int;

This is incorrect for big-endian archs and I will change this to:

     sigusr1_received = (int)(long long)i->si_value.sival_ptr;

This should work on all archs.

>  }
>  
>  static void test_send_signal_common(struct perf_event_attr *attr,
> -				    bool signal_thread)
> +				    bool signal_thread, bool remote)

[...]

Thanks,
Puranjay

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