netdev - Re: Use sock_diag instead of procfs for new address families?

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Message-Id: <20170718.104657.545966026047818509.davem@davemloft.net>
Date:   Tue, 18 Jul 2017 10:46:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     stefanha@...hat.com
Cc:     stephen@...workplumber.org, netdev@...r.kernel.org,
        jhansen@...are.com
Subject: Re: Use sock_diag instead of procfs for new address families?

From: Stefan Hajnoczi <stefanha@...hat.com>
Date: Tue, 18 Jul 2017 17:18:06 +0100

> I am implementing userspace access to socket information for AF_VSOCK.
> A few hours into writing and testing a /proc/net/vsock seq_file I
> noticed that ss(8) prefers NETLINK_SOCK_DIAG over procfs.
> 
> Before potentially wasting time implementing a legacy interface that
> won't be accepted, I thought it might be good to ask :).
> 
> Which approach is preferred?
> 1. New address families must implement only sock_diag.
> 2. Both sock_diag and procfs must be implemented.
> 3. Implement whichever interface you prefer.

Do not use procfs, that is for sure.