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.
Ok. It all depends upon what level of integration / interaction a TOE and thus a RNIC will have with the host network stack. For example, if a customer wants to have TCP and IP stats kept for the off-loaded stack even if it is just being using for RDMA, then there needs to be a method defined to consolidate these stats back into the host network stack tool chain. Similarly, if one wants to maintain a single routing table to manage, etc. on the host, then the RNIC needs to access / update that information accordingly. One can progress through other aspects of integration, e.g. connection management, security interactions (e.g. DOS protection), and so forth. What is exposed again depends upon the level of integration and how customers want to manage their services. This problem also exists for IB but most people have not thought about this from a customer perspective and how to integrate the IB semantics into the way customers manage their infrastructures, do billing, etc. For some environments, they simply do not care but if IB is to be used in the enterprise space, then some thought will be required here since most IT don't see anything as being "free" or self-managed.
Again, Sockets is an application API and not how one communicates to a TOE or RDMA component. The RNIC PI has been proposed as an interface to the RDMA functionality. The PI supports all of the iWARP and IB v 1.2 verbs.
Mike
Thanks
SG
--- Venkata Jagana <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
>
> [EMAIL PROTECTED] 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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