netdev - RE: [PATCH net-next v2] net: sfp: soft status and control support

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: <VI1PR0402MB280036234DA7E153F0C48A97E04E0@VI1PR0402MB2800.eurprd04.prod.outlook.com>
Date:   Thu, 21 Nov 2019 19:14:01 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next v2] net: sfp: soft status and control support

> Subject: Re: [PATCH net-next v2] net: sfp: soft status and control support
> 
> On Thu, Nov 21, 2019 at 06:33:41PM +0000, Ioana Ciornei wrote:
> >
> > > Subject: Re: [PATCH net-next v2] net: sfp: soft status and control
> > > support
> > >
> > > On Thu, Nov 21, 2019 at 03:51:07PM +0000, Ioana Ciornei wrote:
> > > > > Subject: [PATCH net-next v2] net: sfp: soft status and control
> > > > > support
> > > > >
> > > > > Add support for the soft status and control register, which
> > > > > allows TX_FAULT and RX_LOS to be monitored and TX_DISABLE to be
> > > > > set.  We make use of this when the board does not support GPIOs
> > > > > for these
> > > signals.
> > > >
> > > > Hi Russell,
> > > >
> > > > With this addition, shouldn't the following print be removed?
> > > >
> > > > [    2.967583] sfp sfp-mac4: No tx_disable pin: SFP modules will always be
> > > emitting.
> > >
> > > No, because modules do not have to provide the soft controls.
> > >
> >
> > I understand that the soft controls are optional but can't we read
> > byte 93 (Enhanced Options) and see if bit 6 (Optional soft TX_DISABLE
> > control) is set or not (ie the soft TX_DISABLE is implemented)?
> 
> At cage initialisation time, when we don't know whether there's a module
> present or not?
> 

I was not suggesting to keep the print exactly in place.
Anyway, it was merely a curiosity because it can be a misleading info in some situations.

Ioana