netdev - Re: Trying to implement secondary loopback

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Message-ID: <5143353C.3050107@hhi.fraunhofer.de>
Date:	Fri, 15 Mar 2013 15:50:36 +0100
From:	Thomas Martitz <thomas.martitz@....fraunhofer.de>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>
Subject: Re: Trying to implement secondary loopback

Am 15.03.2013 15:45, schrieb richard -rw- weinberger:
> On Fri, Mar 15, 2013 at 3:35 PM, Thomas Martitz
> <thomas.martitz@....fraunhofer.de> wrote:
>> Am 15.03.2013 15:32, schrieb richard -rw- weinberger:
>>
>>> On Fri, Mar 15, 2013 at 3:20 PM, Thomas Martitz
>>> <thomas.martitz@....fraunhofer.de> wrote:
>>>>>
>>>>> The real question is, why do you need a second one?
>>>>> I assume your driver (for the non-existing hardware) is a ethernet
>>>>> driver,
>>>>> and now you're looking for a way to test your shiny new ethX device,
>>>>> correct?
>>>>>
>>>>
>>>> Yes. But that's only the first step. Once I have the basic ethX device
>>>> working I want to make sure the PCIe data transfer is working (with good
>>>> performance), ideally using the very same test application in user space.
>>>
>>>
>>> And there is the second loopback device is this picture?
>>>
>>
>> Mine is the second one, as I cannot modify "lo". The standard "lo" interface
>> is the the first loopback and it seems to be hardcoded to be the only one.
>
> And why can't you implement a regular ethernet driver like everyone else does?
>


That was actually my first attepmt, because I was sure it would work. 
However when I tried that I had trouble to get transfers on localhost 
routed to my code. I did "ifconfig lo down" but then it didn't transfer 
at all. I will retry.

Best regards.

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