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

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Date:	Tue, 05 Dec 2006 10:27:12 -0600
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Brice Goglin <Brice.Goglin@...-lyon.org>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	Roland Dreier <rdreier@...co.com>,
	linux-kernel@...r.kernel.org, openib-general@...nib.org
Subject: Re: [openib-general] [PATCH  v2 04/13] Connection Manager

On Tue, 2006-12-05 at 10:02 -0600, Steve Wise wrote:
> 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...


By the way, FYI:  The Chelsio T3 device support is split into 2 driver
modules: the Ethernet driver and the RDMA driver.  The Ethernet driver
lives in drivers/net/cxgb3 while the RDMA driver lives in
drivers/infiniband/hw/cxgb3.  The Ethernet driver can be used
stand-alone as a 10GbE high-performance NIC driver.  The RDMA driver has
a config-time dependency on the Ethernet driver.

The 2nd version of the Ethernet driver was posted yesterday.  See:

http://www.spinics.net/lists/netdev/msg20464.html



Steve.

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