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

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Message-ID: <20061205051356.GA26845@2ka.mipt.ru>
Date:	Tue, 5 Dec 2006 08:13:57 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	Roland Dreier <rdreier@...co.com>, netdev@...r.kernel.org,
	openib-general@...nib.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH  v2 04/13] Connection Manager

On Mon, Dec 04, 2006 at 10:20:51AM -0600, Steve Wise (swise@...ngridcomputing.com) wrote:
> >  > This and a lot of other changes in this driver definitely says you
> >  > implement your own stack of protocols on top of infiniband hardware.
> > 
> > ...but I do know this driver is for 10-gig ethernet HW.
> > 
> 
> 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.  The
> Ethernet driver, upon which the rdma driver depends, acts both like a
> traditional Ethernet NIC for the Linux stack as well as a TCP offload
> device for the RDMA driver allowing establishment of RDMA connections.
> The Connection Manager (patch 04/13) sends/receives messages from the
> Ethernet driver that sets up HW TCP connections for doing RDMA.  While
> this is indeed implementing TCP offload, it is _not_ integrating it with
> the sockets layer nor the linux stack and offloading sockets
> connections.  Its only supporting offload connections for the RDMA
> driver to do iWARP.   The Ammasso device is another example of this
> (drivers/infiniband/hw/amso1100).  Deep iSCSI adapters are another
> example of this.

So what will happen when application will create a socket, bind it to
that NIC, and then try to establish a TCP connection? How NIC will
decide that received packets are from socket but not for internal TCP
state machine handled by that device?

As a side note, does all iwarp devices _require_ to have very
limited TCP engine implemented it in its hardware, or it is possible
to work with external SW stack?
 
> Steve.

-- 
	Evgeniy Polyakov
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