netdev - Re: [PATCH net-next 1/2] rtnetlink: Add new RTM_GETEECSTATE message to get SyncE status

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210910141423.GA21865@hoboy.vegasvil.org>
Date:   Fri, 10 Sep 2021 07:14:23 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "Machnikowski, Maciej" <maciej.machnikowski@...el.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ido Schimmel <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "abyagowi@...com" <abyagowi@...com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Saeed Mahameed <saeed@...nel.org>,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH net-next 1/2] rtnetlink: Add new RTM_GETEECSTATE message
 to get SyncE status

On Thu, Sep 09, 2021 at 08:18:10AM +0000, Machnikowski, Maciej wrote:

> Controlling the clock that actually drives any components (PHY/MAC) in
> runtime can be a good way to brick the part.

I didn't say that.

> I feel that, while the reuse 
> of structures may be a good idea, the userspace API for clocks is not. 
> They are usually set up once at the board init level and stay like that "forever".
> 
> The outputs we need to control are only a subset of all of them and they
> rather fall in the PTP pins level of details, rather than clock ones.

clk-gate.c
clk-mux.c

Making that available for user space to twiddle is a better way that
tacking on to the PTP stuff.

You can model your device as having a multiplexer in front of it.

Thanks,
Richard