netdev - Re: Trying to implement secondary loopback

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Message-ID: <3D7E565A361FB844A410A5EFCDD7BA4002ECF5@MXSRV3.fe.hhi.de>
Date:	Wed, 13 Mar 2013 20:38:08 +0000
From:	"Martitz, Thomas" <thomas.martitz@....fraunhofer.de>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
CC:	"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>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>
Subject: Re: Trying to implement secondary loopback

>
> ________________________________________
> Von: richard -rw- weinberger [richard.weinberger@...il.com]
> Gesendet: Mittwoch, 13. März 2013 12:13
> An: Martitz, Thomas
> Cc: netdev@...r.kernel.org; davem@...emloft.net; edumazet@...gle.com; herbert@...dor.apana.org.au; ebiederm@...ssion.com
> Betreff: Re: Trying to implement secondary loopback
>
> >
> > So my questions are:
> > * Is this on purpose/expected?
> > * Is there anyway around it so that I can have a custom loopback interface
> > without touching lo's functionality.
> > * Generally, what's the proper way (if any) implement a secondary loopback
> > interface?
>
> The only really question that matters is, why do you need a second
> loopback interface?
> Why can't you use any other pseudo interface?
>

What pseudo interface do you mean? I'm not aware of alternative pseudo interfaces.

I'm developing a NIC and a driver for it. Thus I'm implementing the interface. I'm trying to implement an interface that does exactly do what loopback does except that I want to extend the loopback path to PCIe. This is for testing & validation purposes.

I tried to implement an interface that's doesn't advertise as such. But the data transfer didn't go through my code. My test app is a simple client/server setup in a single process that sends/receive data to/on 127.0.0.1.

Best regards.
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