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 for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 04 Feb 2014 21:51:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Sørensen, Stefan 
	<Stefan.Sorensen@...ctralink.com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"mugunthanvnm@...com" <mugunthanvnm@...com>
Subject: Re: [PATCH] net:cpsw: Pass unhandled ioctl's on to generic phy ioctl

On Tue, 2014-02-04 at 15:08 +0000, Sørensen, Stefan wrote:
> On Tue, 2014-02-04 at 10:50 +0000, Ben Hutchings wrote:
> > > This patch allows the use of a generic timestamping phy connected
> > > to the cpsw if CPTS support is not enabled.
> > 
> > What if CPTS support is enabled in the driver, but this particular
> > machine doesn't have it and uses a timestamping PHY instead?
> 
> That would not work, the CPTS will grab the SIOC{G,S}HWTSTAMP. I'm not
> sure how that could be configured at runtime, other than a private
> ethtool flag.

Do all versions of CPSW include hardware timestamping?  Because the
condition at the top of cpsw_htstamp_ioctl() suggested to me that there
are some that don't.

> Also it seem as the situation with a timestamping MAC and a timestamping
> PHY could deliver bogus ethtool timestamping info, as it will come from
> the PHY if available, but the timestamping will be handled by the MAC.
[...]

Right.  If all versions of CPSW include hardware timestamping then
bother with PHY timestamping at all?  And why make CONFIG_TI_CPTS
configurable?

Ben.

-- 
Ben Hutchings
One of the nice things about standards is that there are so many of them.

Download attachment "signature.asc" of type "application/pgp-signature" (812 bytes)

Powered by blists - more mailing lists