[Xenomai] RTDM: Ethernet driver

[Xenomai] RTDM: Ethernet driver

[yogesh garg]

 I want to write Ethernet (NIC) driver on Xenomai using RTDM. I don't want
to use RTnet. Can someone suggest me any example code or useful links/docs
which can help me to do so.

-- 
Regards,
Yogesh Garg

Re: [Xenomai] RTDM: Ethernet driver

[Anders Blomdell]

On 04/22/2014 11:45 AM, yogesh garg wrote:
>   I want to write Ethernet (NIC) driver on Xenomai using RTDM. I don't want
> to use RTnet.
Why not?

RTnet does not imply that you have to use the RTnet protocol, it's
perfectly fine to use just the Ethernet drivers as you see fit
(that's what I do all the time).

By going your own way, realtime ethernet for Xenomai will be fragmented,
which will benefit nobody (except possibly WindRiver/Microsoft/...)
> Can someone suggest me any example code or useful links/docs
> which can help me to do so.
>

/Anders

--
Anders Blomdell                  Email: anders.blomdell@control.lth.se
Department of Automatic Control
Lund University                  Phone:    +46 46 222 4625
P.O. Box 118
SE-221 00 Lund, Sweden

Re: [Xenomai] RTDM: Ethernet driver

[Michael Haberler]

Am 22.04.2014 um 13:16 schrieb Anders Blomdell <anders.blomdell@control.lth.se>:

> On 04/22/2014 11:45 AM, yogesh garg wrote:
>>  I want to write Ethernet (NIC) driver on Xenomai using RTDM. I don't want
>> to use RTnet.
> Why not?
> 
> RTnet does not imply that you have to use the RTnet protocol, it's
> perfectly fine to use just the Ethernet drivers as you see fit
> (that's what I do all the time).
> 
> By going your own way, realtime ethernet for Xenomai will be fragmented,
> which will benefit nobody (except possibly WindRiver/Microsoft/...)

well there are valid reasons

One we have is: since the application runs across RTAI, Xenomai and RT_PREEMPT a single method would be beneficial, even at the cost of lower performance. Not everyone is fond of networking silos.

- Michael


>> Can someone suggest me any example code or useful links/docs
>> which can help me to do so.
>> 
> 
> /Anders
> 
> --
> Anders Blomdell                  Email: anders.blomdell@control.lth.se
> Department of Automatic Control
> Lund University                  Phone:    +46 46 222 4625
> P.O. Box 118
> SE-221 00 Lund, Sweden
> 
> 
> 
> 
> 
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai

Re: [Xenomai] RTDM: Ethernet driver

[Gilles Chanteperdrix]

On 04/22/2014 01:53 PM, Michael Haberler wrote:
>
> Am 22.04.2014 um 13:16 schrieb Anders Blomdell
> <anders.blomdell@control.lth.se>:
>
>> On 04/22/2014 11:45 AM, yogesh garg wrote:
>>> I want to write Ethernet (NIC) driver on Xenomai using RTDM. I
>>> don't want to use RTnet.
>> Why not?
>>
>> RTnet does not imply that you have to use the RTnet protocol, it's
>> perfectly fine to use just the Ethernet drivers as you see fit
>> (that's what I do all the time).
>>
>> By going your own way, realtime ethernet for Xenomai will be
>> fragmented, which will benefit nobody (except possibly
>> WindRiver/Microsoft/...)
>
> well there are valid reasons
>
> One we have is: since the application runs across RTAI, Xenomai and
> RT_PREEMPT a single method would be beneficial, even at the cost of
> lower performance. Not everyone is fond of networking silos.

RTnet already works with RTAI and Xenomai, the API exposed by RTnet is 
the standard socket interface and drivers in RTnet are copycats of Linux 
drivers.

So, I do not see what prevents you from using Linux drivers with Linux 
and preempt_rt and RTnet drivers with Xenomai and RTAI.

-- 
					    Gilles.

Re: [Xenomai] RTDM: Ethernet driver

[yogesh garg]

What about license part. I think RTnet is GNU GPL, so I can't use it for
commercial products.
Otherwise I need to expose complete source code.


On Tue, Apr 22, 2014 at 5:29 PM, Gilles Chanteperdrix <
gilles.chanteperdrix@xenomai.org> wrote:

> On 04/22/2014 01:53 PM, Michael Haberler wrote:
>
>>
>> Am 22.04.2014 um 13:16 schrieb Anders Blomdell
>> <anders.blomdell@control.lth.se>:
>>
>>  On 04/22/2014 11:45 AM, yogesh garg wrote:
>>>
>>>> I want to write Ethernet (NIC) driver on Xenomai using RTDM. I
>>>> don't want to use RTnet.
>>>>
>>> Why not?
>>>
>>> RTnet does not imply that you have to use the RTnet protocol, it's
>>> perfectly fine to use just the Ethernet drivers as you see fit
>>> (that's what I do all the time).
>>>
>>> By going your own way, realtime ethernet for Xenomai will be
>>> fragmented, which will benefit nobody (except possibly
>>> WindRiver/Microsoft/...)
>>>
>>
>> well there are valid reasons
>>
>> One we have is: since the application runs across RTAI, Xenomai and
>> RT_PREEMPT a single method would be beneficial, even at the cost of
>> lower performance. Not everyone is fond of networking silos.
>>
>
> RTnet already works with RTAI and Xenomai, the API exposed by RTnet is the
> standard socket interface and drivers in RTnet are copycats of Linux
> drivers.
>
> So, I do not see what prevents you from using Linux drivers with Linux and
> preempt_rt and RTnet drivers with Xenomai and RTAI.
>
> --
>                                             Gilles.
>
>
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai
>



-- 
Regards,
Yogesh Garg

Re: [Xenomai] RTDM: Ethernet driver

[Jeroen Van den Keybus]

> Can someone suggest me any example code or useful links/docs
> which can help me to do so.

Have a good look at Linux drivers/net/ethernet/intel/e1000e and think
again about writing a network driver yourself. Note that the larger
part of a NIC driver is needed just to get a link reliably across the
large number of MAC/PHY combinations and revisions that are out there.

Also grep for 'workaround'...

Jeroen.

>
> --
> Regards,
> Yogesh Garg
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai

Re: [Xenomai] RTDM: Ethernet driver

[Jeroen Van den Keybus]

2014-04-23 7:40 GMT+02:00 yogesh garg <yogesh.garg1983@gmail.com>:
> What about license part. I think RTnet is GNU GPL, so I can't use it for
> commercial products.
> Otherwise I need to expose complete source code.

Since you will be basing your driver largely on existing GPL drivers
(quite inevitably), your driver is going to end up being GPL'ed
anyway.

Don't forget that you don't need to expose your application, only
whatever you modified/added to GPL'ed parts. That's not so bad for
getting a working driver framework in return, is it ?

Jeroen.