netdev - Re: [PATCH v3 bpf-next 1/2] bpf: af_unix: Implement BPF iterator for UNIX domain socket.

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Date:   Thu, 5 Aug 2021 17:41:14 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Kuniyuki Iwashima <kuniyu@...zon.co.jp>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Benjamin Herrenschmidt <benh@...zon.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 bpf-next 1/2] bpf: af_unix: Implement BPF iterator for
 UNIX domain socket.

On Wed, Aug 04, 2021 at 04:08:50PM +0900, Kuniyuki Iwashima wrote:
> Currently, the batch optimization introduced for the TCP iterator in the
> commit 04c7820b776f ("bpf: tcp: Bpf iter batching and lock_sock") is not
> applied.  It will require replacing the big lock for the hash table with
may be s/applied/used/.  I thought it meant the commit is not landed.

> small locks for each hash list not to block other processes.
Right, I don't think it can be directly reused.  Not necessary
related to the big lock though.  Actually, a big lock will still
work for batching but just less ideal.

Batching is needed for supporting bpf_setsockopt.  It can be added later
together with the bpf_setsockopt support.