[Rdma-developers] Re: [openib-general] OpenIB and OpenRDMA: Convergence on common RDMA APIs and ULPs for Linux

[Sukanta ganguly]

Venkata,
   How will that work? If the RNIC offloads RDMA and
TCP completely from the Operating System and does not
share any state information then the application
running on the host will never be in the position to
utilize the socket interface to use the communication
logic to send and receive data between the remote node
and itself. Some information needs to be shared. How
much of it and what exactly needs to be shared is the
question.

Thanks
SG

--- Venkata Jagana <jagana at us.ibm.com> wrote:
> 
> 
> 
> 
> 
> 
> rdma-developers-admin at lists.sourceforge.net wrote on
> 05/25/2005 09:47:00
> PM:
> 
> > Venkata,
> > Interesting coincidence: I was talking with
> someone (at HP) today
> > who knows substantially more than I do about
> RNICs.
> > They indicated RNICs need to manage TCP state on
> the card from userspace.
> > I suspect that's only possible through a private
> interface
> > (e.g. ioctl() or /proc) or the non-existant (in
> kernel.org)
> > TOE implementation. Is this correct?
> >
> 
> Not correct.
> 
> Since RNICs are offloaded adapters with RDMA
> protocols layered on
> top of TCP stack, they do maintain the TCP state
> internally but
> it does not expose to the host. RNIC expose only
> RNIC Verbs interface
> to the host bot not TOE interface.
> 
> Thanks
> Venkat
> 
> >
> > hth,
> > grant
> >
> >
> >
>
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