RE: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Wyborny, Carolyn]

> -Original Message-
> From: netdev-ow...@vger.kernel.org [mailto:netdev-
> ow...@vger.kernel.org] On Behalf Of Florian Fainelli
> Sent: Thursday, July 27, 2017 10:58 AM
> To: Andrew Lunn <and...@lunn.ch>; Brown, Aaron F
> <aaron.f.br...@intel.com>
> Cc: John W. Linville <linvi...@tuxdriver.com>; netdev@vger.kernel.org; intel-
> wired-...@lists.osuosl.org
> Subject: Re: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
> 
> On 07/27/2017 08:37 AM, Andrew Lunn wrote:
> > On Thu, Jul 27, 2017 at 12:40:01AM +, Brown, Aaron F wrote:
> >>> From: Intel-wired-lan [mailto:intel-wired-lan-boun...@osuosl.org] On
> Behalf
> >>> Of John W. Linville
> >>> Sent: Friday, July 21, 2017 11:12 AM
> >>> To: netdev@vger.kernel.org
> >>> Cc: intel-wired-...@lists.osuosl.org; John W. Linville
> >>> <linvi...@tuxdriver.com>
> >>> Subject: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
> >>>
> >>> The management port on an Edgecore AS7712-32 switch uses an igb MAC,
> >>> but
> >>> it uses a BCM54616 PHY. Without a patch like this, loading the igb
> >>> module produces dmesg output like this:
> >>>
> >>> [3.439125] igb: Copyright (c) 2007-2014 Intel Corporation.
> >>> [3.439866] igb: probe of :00:14.0 failed with error -2
> >>>
> >>> Signed-off-by: John W. Linville <linvi...@tuxdriver.com>
> >>> Cc: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
> >>> ---
> >>>  drivers/net/ethernet/intel/igb/e1000_82575.c   | 6 ++
> >>>  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
> >>>  drivers/net/ethernet/intel/igb/e1000_hw.h  | 1 +
> >>>  3 files changed, 8 insertions(+)
> >>
> >> I do not have the specific hardware (Edgecore switch) but as far as
> regression tests go this works fine.
> >> Tested-by: Aaron Brown <aaron.f.br...@intel.com>
> >
> > Sorry, missed the initial post, so replying to a reply.
> >
> > Linux has supported the BCM54616 PHY since April 2015. If the Intel
> > drivers used the Linux PHY drivers, you would not of had this problem.
> >
> > It would be good if somebody spent the time to migrate these MAC
> > drivers to use the common Linux PHY infrastructure.
> 
> I suspect there is a design pattern within the Intel drivers to share as
> much low-level code as possible between OSes and only have some
> Linux-ism where necessary (e.g: net_device, ethtool etc.).
> 
> PHY code is a pain in general, especially if you are serious about
> testing interoperability (which is where you can spend tons of $$$ with
> little reward but just say: yes it works), so it may make sense to share
> it across different OSes.
> 
> I too, wish there was more sharing, but considering that this works for
> the Intel driver, there is little incentive in doing this I suppose...
> --
> Florian

Yes Florian you are correct generally, but future implementations have not been 
ruled out.  With this driver, we had our custom phy init code tested and 
released for several products before phylib existed.  I began research on a 
phylib implementation for it at one point, but internal product decisions ended 
up lowering the priority of that work.

Thanks,

Carolyn

Carolyn Wyborny 
Linux Development 
Networking Division 
Intel Corporation 

Re: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Andrew Lunn]

> I recall someone mentioning that there were plans to have phylib support
> [Q]SFP[+] modules as well. I am very interested in that work, if someone
> has patches/plans I would like to take a look.

Hi Jon

The first part was posted yesterday:

https://www.spinics.net/lists/netdev/msg445767.html

Andrew

Re: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Florian Fainelli]

On 07/27/2017 08:37 AM, Andrew Lunn wrote:
> On Thu, Jul 27, 2017 at 12:40:01AM +, Brown, Aaron F wrote:
>>> From: Intel-wired-lan [mailto:intel-wired-lan-boun...@osuosl.org] On Behalf
>>> Of John W. Linville
>>> Sent: Friday, July 21, 2017 11:12 AM
>>> To: netdev@vger.kernel.org
>>> Cc: intel-wired-...@lists.osuosl.org; John W. Linville
>>> 
>>> Subject: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
>>>
>>> The management port on an Edgecore AS7712-32 switch uses an igb MAC,
>>> but
>>> it uses a BCM54616 PHY. Without a patch like this, loading the igb
>>> module produces dmesg output like this:
>>>
>>> [3.439125] igb: Copyright (c) 2007-2014 Intel Corporation.
>>> [3.439866] igb: probe of :00:14.0 failed with error -2
>>>
>>> Signed-off-by: John W. Linville 
>>> Cc: Jeff Kirsher 
>>> ---
>>>  drivers/net/ethernet/intel/igb/e1000_82575.c   | 6 ++
>>>  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
>>>  drivers/net/ethernet/intel/igb/e1000_hw.h  | 1 +
>>>  3 files changed, 8 insertions(+)
>>
>> I do not have the specific hardware (Edgecore switch) but as far as 
>> regression tests go this works fine.
>> Tested-by: Aaron Brown 
> 
> Sorry, missed the initial post, so replying to a reply.
> 
> Linux has supported the BCM54616 PHY since April 2015. If the Intel
> drivers used the Linux PHY drivers, you would not of had this problem.
> 
> It would be good if somebody spent the time to migrate these MAC
> drivers to use the common Linux PHY infrastructure.

I suspect there is a design pattern within the Intel drivers to share as
much low-level code as possible between OSes and only have some
Linux-ism where necessary (e.g: net_device, ethtool etc.).

PHY code is a pain in general, especially if you are serious about
testing interoperability (which is where you can spend tons of $$$ with
little reward but just say: yes it works), so it may make sense to share
it across different OSes.

I too, wish there was more sharing, but considering that this works for
the Intel driver, there is little incentive in doing this I suppose...
-- 
Florian

Re: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Jonathan Toppins]

On 07/27/2017 11:37 AM, Andrew Lunn wrote:
> On Thu, Jul 27, 2017 at 12:40:01AM +, Brown, Aaron F wrote:
>>> From: Intel-wired-lan [mailto:intel-wired-lan-boun...@osuosl.org] On Behalf
>>> Of John W. Linville
>>> Sent: Friday, July 21, 2017 11:12 AM
>>> To: netdev@vger.kernel.org
>>> Cc: intel-wired-...@lists.osuosl.org; John W. Linville
>>> 
>>> Subject: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
>>>
>>> The management port on an Edgecore AS7712-32 switch uses an igb MAC,
>>> but
>>> it uses a BCM54616 PHY. Without a patch like this, loading the igb
>>> module produces dmesg output like this:
>>>
>>> [3.439125] igb: Copyright (c) 2007-2014 Intel Corporation.
>>> [3.439866] igb: probe of :00:14.0 failed with error -2
>>>
>>> Signed-off-by: John W. Linville 
>>> Cc: Jeff Kirsher 
>>> ---
>>>  drivers/net/ethernet/intel/igb/e1000_82575.c   | 6 ++
>>>  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
>>>  drivers/net/ethernet/intel/igb/e1000_hw.h  | 1 +
>>>  3 files changed, 8 insertions(+)
>>
>> I do not have the specific hardware (Edgecore switch) but as far as 
>> regression tests go this works fine.
>> Tested-by: Aaron Brown 
> 
> Sorry, missed the initial post, so replying to a reply.
> 
> Linux has supported the BCM54616 PHY since April 2015. If the Intel
> drivers used the Linux PHY drivers, you would not of had this problem.
> 
> It would be good if somebody spent the time to migrate these MAC
> drivers to use the common Linux PHY infrastructure.
> 
>   Andrew
> 

Thank you. This was a point I made in 2015 when I posted the original
patch for igb to support this phy.

http://marc.info/?l=linux-netdev=142870703206646=2
http://marc.info/?l=linux-netdev=142870703806647=2
http://marc.info/?l=linux-netdev=142870703806648=2

http://marc.info/?l=linux-netdev=142930225730399=2
http://marc.info/?l=linux-netdev=142930226230400=2

It would be good to accept this patch and then later work to port older
drivers to use phylib.

It might be worthwhile to start beating up on new driver submissions
that don't use phylib.

I recall someone mentioning that there were plans to have phylib support
[Q]SFP[+] modules as well. I am very interested in that work, if someone
has patches/plans I would like to take a look.

-Jon

Re: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Andrew Lunn]

On Thu, Jul 27, 2017 at 12:40:01AM +, Brown, Aaron F wrote:
> > From: Intel-wired-lan [mailto:intel-wired-lan-boun...@osuosl.org] On Behalf
> > Of John W. Linville
> > Sent: Friday, July 21, 2017 11:12 AM
> > To: netdev@vger.kernel.org
> > Cc: intel-wired-...@lists.osuosl.org; John W. Linville
> > 
> > Subject: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
> > 
> > The management port on an Edgecore AS7712-32 switch uses an igb MAC,
> > but
> > it uses a BCM54616 PHY. Without a patch like this, loading the igb
> > module produces dmesg output like this:
> > 
> > [3.439125] igb: Copyright (c) 2007-2014 Intel Corporation.
> > [3.439866] igb: probe of :00:14.0 failed with error -2
> > 
> > Signed-off-by: John W. Linville 
> > Cc: Jeff Kirsher 
> > ---
> >  drivers/net/ethernet/intel/igb/e1000_82575.c   | 6 ++
> >  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
> >  drivers/net/ethernet/intel/igb/e1000_hw.h  | 1 +
> >  3 files changed, 8 insertions(+)
> 
> I do not have the specific hardware (Edgecore switch) but as far as 
> regression tests go this works fine.
> Tested-by: Aaron Brown 

Sorry, missed the initial post, so replying to a reply.

Linux has supported the BCM54616 PHY since April 2015. If the Intel
drivers used the Linux PHY drivers, you would not of had this problem.

It would be good if somebody spent the time to migrate these MAC
drivers to use the common Linux PHY infrastructure.

Andrew

RE: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY

[Brown, Aaron F]

> From: Intel-wired-lan [mailto:intel-wired-lan-boun...@osuosl.org] On Behalf
> Of John W. Linville
> Sent: Friday, July 21, 2017 11:12 AM
> To: netdev@vger.kernel.org
> Cc: intel-wired-...@lists.osuosl.org; John W. Linville
> 
> Subject: [Intel-wired-lan] [PATCH] igb: support BCM54616 PHY
> 
> The management port on an Edgecore AS7712-32 switch uses an igb MAC,
> but
> it uses a BCM54616 PHY. Without a patch like this, loading the igb
> module produces dmesg output like this:
> 
> [3.439125] igb: Copyright (c) 2007-2014 Intel Corporation.
> [3.439866] igb: probe of :00:14.0 failed with error -2
> 
> Signed-off-by: John W. Linville 
> Cc: Jeff Kirsher 
> ---
>  drivers/net/ethernet/intel/igb/e1000_82575.c   | 6 ++
>  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
>  drivers/net/ethernet/intel/igb/e1000_hw.h  | 1 +
>  3 files changed, 8 insertions(+)

I do not have the specific hardware (Edgecore switch) but as far as regression 
tests go this works fine.
Tested-by: Aaron Brown