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:

quoted

Steve Wise wrote:

quoted

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.

quoted

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.