netdev - Re: [PATCH v2 04/13] Connection Manager

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Message-Id: <1165334529.16087.69.camel@stevo-desktop>
Date:	Tue, 05 Dec 2006 10:02:09 -0600
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Brice Goglin <Brice.Goglin@...-lyon.org>
Cc:	Roland Dreier <rdreier@...co.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	openib-general@...nib.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH  v2 04/13] Connection Manager

On Tue, 2006-12-05 at 11:45 +0100, Brice Goglin wrote:
> Steve Wise wrote:
> > There is no SW TCP stack in this driver.  The HW supports RDMA over
> > TCP/IP/10GbE in HW and this is required for zero-copy RDMA over Ethernet
> > (aka iWARP).  The device is a 10 GbE device, not Infiniband.
> 
> Then, I wonder why the driver goes in drivers/infiniband/ :)

drivers/infiniband support both IB and IWARP transports.

> Is there really no way to only keep the actual hw infiniband there, move
> iwarp/rdma drivers in drivers/net/something/ and the core stuff in
> net/something/ ?
> 

Sure, this _could_ be done, but what I think you're missing is that
applications use the interface exported by drivers/infiniband over both
IB -and- IWARP transports.  The application can be written to not care
which transport is used.   Examples of apps that can run over both
transports using the same common interface: 

user mode: MVAPICH2, OMPI, IMPI, HPMPI, 
kernel mode: NFS-RDMA, iSER.  

Note that the include directory used by drivers/infiniband is now
include/rdma.  Perhaps drivers/infiniband should be renamed to
drivers/rdma as well at some point...

Steve.

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