netdev - Re: [PATCH v2 net-next 6/6] docs: net: Add description of SyncE interfaces

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: <20211108090302.64ca86a5@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 8 Nov 2021 09:03:02 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     "Machnikowski, Maciej" <maciej.machnikowski@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "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>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>,
        "saeed@...nel.org" <saeed@...nel.org>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>
Subject: Re: [PATCH v2 net-next 6/6] docs: net: Add description of SyncE
 interfaces

On Mon, 8 Nov 2021 18:29:50 +0200 Ido Schimmel wrote:
> I also want to re-iterate my dissatisfaction with the interface being
> netdev-centric. By modelling the EEC as a standalone object we will be
> able to extend it to set the source of the EEC to something other than a
> netdev in the future. If we don't do it now, we will end up with two
> ways to report the source of the EEC (i.e., EEC_SRC_PORT and something
> else).
> 
> Other advantages of modelling the EEC as a separate object include the
> ability for user space to determine the mapping between netdevs and EECs
> (currently impossible) and reporting additional EEC attributes such as
> SyncE clockIdentity and default SSM code. There is really no reason to
> report all of this identical information via multiple netdevs.

Indeed, I feel convinced. I believe the OCP timing card will benefit
from such API as well. I pinged Jonathan if he doesn't have cycles 
I'll do the typing.

What do you have in mind for driver abstracting away pin selection?
For a standalone clock fed PPS signal from a backplate this will be
impossible, so we may need some middle way.