netdev - Re: [RFC PATCH 1/2] block: add support for redirecting IO completion through eBPF

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Message-ID: <737d9d3f-e72c-ac31-6b2a-997202a302bd@acm.org>
Date:   Mon, 21 Oct 2019 06:48:17 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Hou Tao <houtao1@...wei.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     linux-block@...r.kernel.org, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Alexei Starovoitov <ast@...nel.org>, hare@...e.com,
        osandov@...com, ming.lei@...hat.com, damien.lemoal@....com,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Subject: Re: [RFC PATCH 1/2] block: add support for redirecting IO completion
 through eBPF

On 10/21/19 6:42 AM, Hou Tao wrote:
> Your suggestion is much simpler, so there will be no need for adding a new
> program type, and all things need to be done are adding a raw tracepoint,
> moving bpf_ccpu into struct request, and letting a BPF program to modify it.

blk-mq already supports processing completions on the CPU that submitted
a request so it's not clear to me why any changes in the block layer are
being proposed for redirecting I/O completions?

Thanks,

Bart.