netdev - Re: PTP: PHY timestamping when MAC is PTP capable

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] [day] [month] [year] [list]

Message-ID: <20170828123331.sv52oawme6hfpdy2@localhost>
Date:   Mon, 28 Aug 2017 05:33:31 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Sørensen, Stefan 
        <Stefan.Sorensen@...ctralink.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: PTP: PHY timestamping when MAC is PTP capable

On Mon, Aug 28, 2017 at 08:39:44AM +0000, Sørensen, Stefan wrote:
> I have run into a problem with packet timestamping on a platform (cpsw
> + dp83640) where both the PHY and the MAC is PTP capable and I need
> the PHY to perform the timestamping. In the current code,
> SIOCGHWTSTAMP is passed to the MAC driver and only if it does not
> support PTP itself will it pass it on to the PHY driver.
> 
> I see two ways to fix this:

Just disable CONFIG_CPTS and patch cpsw.c to pass SIOC[GS]HWTSTAMP.

I don't see any reasonable way to make this sort of thing configurable
at run time.

Thanks,
Richard