netdev - Re: [Patch bpf-next 00/19] sock_map: add non-TCP and cross-protocol support

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Message-ID: <20210203174846.gvhyv3hlrfnep7xe@ast-mbp.dhcp.thefacebook.com>
Date:   Wed, 3 Feb 2021 09:48:46 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        duanxiongchun@...edance.com, wangdongdong.6@...edance.com,
        jiang.wang@...edance.com, Cong Wang <cong.wang@...edance.com>
Subject: Re: [Patch bpf-next 00/19] sock_map: add non-TCP and cross-protocol
 support

On Tue, Feb 02, 2021 at 08:16:17PM -0800, Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> Currently sockmap only fully supports TCP, UDP is partially supported
> as it is only allowed to add into sockmap. This patch extends sockmap
> with: 1) full UDP support; 2) full AF_UNIX dgram support; 3) cross
> protocol support. Our goal is to allow socket splice between AF_UNIX
> dgram and UDP.

Please expand on the use case. The 'splice between af_unix and udp'
doesn't tell me much. The selftest doesn't help to understand the scope either.