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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Florent Revest <revest@chromium.org>
Cc: bpf <bpf@vger.kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>, Yonghong Song <yhs@fb.com>,
	KP Singh <kpsingh@kernel.org>,
	Brendan Jackman <jackmanb@chromium.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH bpf-next v2 5/6] libbpf: Introduce a BPF_SNPRINTF helper macro
Date: Fri, 26 Mar 2021 16:02:32 -0700	[thread overview]
Message-ID: <CAEf4BzZ-goAfpEWHt83TR_E9OjLXBwC70TX7G_QKd_HGdXGyOw@mail.gmail.com> (raw)
In-Reply-To: <20210324022211.1718762-6-revest@chromium.org>

On Tue, Mar 23, 2021 at 7:23 PM Florent Revest <revest@chromium.org> wrote:
>
> Similarly to BPF_SEQ_PRINTF, this macro turns variadic arguments into an
> array of u64, making it more natural to call the bpf_snprintf helper.
>
> Signed-off-by: Florent Revest <revest@chromium.org>
> ---
>  tools/lib/bpf/bpf_tracing.h | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
> index d9a4c3f77ff4..e5c6ede6060b 100644
> --- a/tools/lib/bpf/bpf_tracing.h
> +++ b/tools/lib/bpf/bpf_tracing.h
> @@ -447,4 +447,22 @@ static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)
>                 __ret;                                                      \
>         })
>
> +/*
> + * BPF_SNPRINTF wraps the bpf_snprintf helper with variadic arguments instead of
> + * an array of u64.
> + */
> +#define BPF_SNPRINTF(out, out_size, fmt, args...)                          \
> +       ({                                                                  \

Same feedback as the previous patch, but let's also reduce the
nestedness level, those ({ }) can be shifted one tab left, right?
Please do the same for the previous patch as well. Thanks!

> +               _Pragma("GCC diagnostic push")                              \
> +               _Pragma("GCC diagnostic ignored \"-Wint-conversion\"")      \
> +               unsigned long long ___param[___bpf_narg(args)];             \
> +               static const char ___fmt[] = fmt;                           \
> +               int __ret;                                                  \
> +               ___bpf_fill(___param, args);                                \
> +               _Pragma("GCC diagnostic pop")                               \
> +               __ret = bpf_snprintf(out, out_size, ___fmt,                 \
> +                                    ___param, sizeof(___param));           \
> +               __ret;                                                      \
> +       })
> +
>  #endif
> --
> 2.31.0.291.g576ba9dcdaf-goog
>

  reply	other threads:[~2021-03-26 23:03 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-24  2:22 [PATCH bpf-next v2 0/6] Add a snprintf eBPF helper Florent Revest
2021-03-24  2:22 ` [PATCH bpf-next v2 1/6] bpf: Factorize bpf_trace_printk and bpf_seq_printf Florent Revest
2021-03-26 21:53   ` Andrii Nakryiko
2021-03-26 22:51     ` Andrii Nakryiko
2021-04-06 15:35       ` Florent Revest
2021-04-07 21:53         ` Andrii Nakryiko
2021-04-08 22:52           ` Florent Revest
2021-03-24  2:22 ` [PATCH bpf-next v2 2/6] bpf: Add a ARG_PTR_TO_CONST_STR argument type Florent Revest
2021-03-26 22:23   ` Andrii Nakryiko
2021-04-06 15:38     ` Florent Revest
2021-03-24  2:22 ` [PATCH bpf-next v2 3/6] bpf: Add a bpf_snprintf helper Florent Revest
2021-03-26 22:55   ` Andrii Nakryiko
2021-04-06 16:06     ` Florent Revest
2021-04-07 22:03       ` Andrii Nakryiko
2021-04-08 22:43         ` Florent Revest
2021-03-24  2:22 ` [PATCH bpf-next v2 4/6] libbpf: Initialize the bpf_seq_printf parameters array field by field Florent Revest
2021-03-26 23:01   ` Andrii Nakryiko
2021-04-06 15:42     ` Florent Revest
2021-03-24  2:22 ` [PATCH bpf-next v2 5/6] libbpf: Introduce a BPF_SNPRINTF helper macro Florent Revest
2021-03-26 23:02   ` Andrii Nakryiko [this message]
2021-03-24  2:22 ` [PATCH bpf-next v2 6/6] selftests/bpf: Add a series of tests for bpf_snprintf Florent Revest
2021-03-26 23:05   ` Andrii Nakryiko
2021-04-06 15:40     ` Florent Revest

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