netdev - RE: Question w.r.t debugfs / netdevice pass-through IOCTL

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Date:	Mon, 25 Oct 2010 06:48:28 -0700
From:	<Shyam_Iyer@...l.com>
To:	<john.r.fastabend@...el.com>, <shemminger@...tta.com>
CC:	<ddutt@...cade.COM>, <netdev@...r.kernel.org>
Subject: RE: Question w.r.t debugfs / netdevice pass-through IOCTL



> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On Behalf Of John Fastabend
> Sent: Thursday, October 21, 2010 4:22 PM
> To: Stephen Hemminger
> Cc: Debashis Dutt; netdev@...r.kernel.org
> Subject: Re: Question w.r.t debugfs / netdevice pass-through IOCTL
> 
> On 10/20/2010 9:19 PM, Stephen Hemminger wrote:
> > On Wed, 20 Oct 2010 20:26:50 -0700
> > Debashis Dutt <ddutt@...cade.COM> wrote:
> >
> >> Hi,
> >>
> >> For the Brocade 10G Ethernet driver (bna) we want to implement a set of operations which is not
> supported by current tools like ethtool.
> >>
> >> Examples of such operations would be
> >>        a) Queries related to CEE, if the link is CEE.
> 
> Assuming CEE is Converged Enhanced Ethernet here.
> 
> For CEE queries please consider using the dcbnl interface in /net/dcb/dcbnl.c. If
> it is missing an interface that would be useful to all DCB devices we could
> entertain adding it. Also this way DCB queries will work with existing tools that
> query these things lldpad/dcbtool.
> 
> The things you would want to know about a CEE device should be about the same
> regardless of the hardware in use lets try to use a single interface and avoid
> private interfaces.

John - I agree on this.. On a sidenote I would like the interface to not be netdev device specific.. 
View the CEE device to be not just an Ethernet controller but a SCSI controller as well and hence if this interface can be generally accessible by other subsystems.

> 
> Thanks,
> John.
> 
> >>        b) Get traces from firmware.
> >
> >>
> >> I was wondering what would be right approach to take here:
> >>                 a) use debugfs (like the Chelsio cxgb4 driver)
> > Works as long as they are really debug operations. The debugfs isn't always
> > available, and support should be a config option for your driver.
> >
> >>                 b) use SIOCDEVPRIVATE for the pass through IOCTL defined in
> >>                     struct net_device_ops{}
> >
> > The problem with ioctl is it doesn't work for 32 bit user space
> > compatiablity. The ioctl compat layer does not have enough context
> > to translate SIOCDEVPRIVATE
> >
> >>                     As per comments in the header file, b) should not be used
> >>                     since this IOCTL is supposed to be deprecated.
> >>                 c) use procfs / sysfs (these may not scale, in our opinion)
> >
> > Although less common, there were drivers putting things in /proc/net/xxx/ethX
> >
> >
> >
> 
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