netdev - Re: [PATCH v4 bpf-next 4/4] tools/bpftool: switch map event_pipe to libbpf's perf

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Date:   Mon, 1 Jul 2019 15:04:43 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     <andrii.nakryiko@...il.com>, <ast@...com>, <daniel@...earbox.net>,
        <kernel-team@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next 4/4] tools/bpftool: switch map event_pipe to
 libbpf's perf_buffer

On Sat, 29 Jun 2019 23:51:09 -0700, Andrii Nakryiko wrote:
> Switch event_pipe implementation to rely on new libbpf perf buffer API
> (it's raw low-level variant).
> 
> Signed-off-by: Andrii Nakryiko <andriin@...com>

> -int do_event_pipe(int argc, char **argv)
> -{
> -	int i, nfds, map_fd, index = -1, cpu = -1;
>  	struct bpf_map_info map_info = {};
> -	struct event_ring_info *rings;
> -	size_t tmp_buf_sz = 0;
> -	void *tmp_buf = NULL;
> -	struct pollfd *pfds;
> +	struct perf_buffer_raw_opts opts;

I'm slightly worried we don't init the ops, but we can wait and see if
it bites us or not.

Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Thanks!