Re: [OPENETLAB] Question: Oplets and Accelar Queue Mgt./Routing

["Vivek Sawant" <vivek@nortelnetworks.com>]

Rob Duncan wrote:
> 
> "Sawant, Vivek " <vivek@americasm10.nt.com> writes:
> 
> > I am playing with an idea of influencing Accelar Forwarding from Oplets.
> > I am looking at an algorithm which is an extension to RED. I wonder if I
> > can implement it as an Oplet and combine it with Accelar IPfilter
> > setting to influence Accelar Packet forwarding.
> >
> > My initial investigation suggests that this is not possible. Here is
> > why. This algorithm, like any other queue management algorithm, includes
> > the just arrived packet in a computation to decide if the packet should
> > be dropped or queued. If this computation happens in an Oplet, it is
> > essentially happening outside the Accelar forwarding path. Given current
> > Accelar filter actions, one can either choose to drop or forward a
> > packet (besides getting a copy of it, etc.) One cannot pull a packet
> > out, do computations and then give it back to Accelar forwarding engine.
> > (I know, it will radically slow the engine down.) So, such a queue
> > management algo has to be part of the Accelar forwarding mechanism.
> >
> > Is my inference correct or is it still possible to implement such a
> > scheme through Oplets? Does Accelar support RED queues?
> 
> Yes, I believe you are right.  We don't currently have an inverse
> operation for JCapture.  Right now the only way to send packets out of
> the ORE is by using a socket, which of course is not what you want.  I
> think OpenIP does have the kind of API you want, so we shoudl take a
> look at it.  I don't think it's any harder to implement that JCapture
> is...
> 
> R.

Let me understand this. So, there is a way to intercept an incoming
packet
and send it back to Accelar forwarding engine? If this is true, it's a 
great news. I had almost lost hope for my particular experiment.

Where can I look at the OpenIP API mentioned by you. Is there anything
I can do to help implement support for this in ORE?

Thanks.

_vivek