[openib-general] APM support in openib stack

[Tang, Changqing]

> > > 
> > > There are other possibilities here too using inband (IB) 
> exchanges.
> > > libibsa is not that far away either. What is your time frame ?
> > 
> > Is it possible to have it in OFED 1.2 ?
> 
> What libibsa capabilities are you looking for ? Is it just 
> PathRecord related as above ?

What even functions to let us to do connect/accept IB setup, can't we
combine it into libibcm.so, why use a separate library ?


--CQ



> 
> -- Hal
> 
> > 
> > > 
> > > > at your ranks pre exchange and hardcode the other IB PATH
> > > params such
> > > > as MTU, PKEY and SL you set later into the IB RC QP.
> > > > 
> > > > However, a no rdma cm approach means you need to apply
> > > hacks to "guess" 
> > > > the correct pkey, mtu and sl and some more limitations that
> > > eventually
> > > > you would face when coming to advanced IB deployment 
> environments.
> > > 
> > > Also, you would make more work if iWARP support is of interest as 
> > > well.
> > > It comes "for free" or at least "for cheap" if the RDMA 
> CM approach 
> > > is taken.
> > 
> > We understand that, but we hope to have a connect/accept style IB 
> > connection setup, without IPoIB involved, like HP-UX 
> IT-API(similar to 
> > uDAPL without underlying IP support), it works with multiple cards.
> > 
> > Configure 4-5 IP addresses on a single node is kind of silly.
> > 
> > 
> > 
> > --CQ
> > 
> > 
> > > 
> > > -- Hal
> > > 
> > > > All you have to do to use the rdma cm to require a functional 
> > > > IPoIB NIC on each of the active IB PORTs, which is a trivial 
> > > > requirement from the users in the Ethernet world, so 
> why not apply 
> > > > it
> > > here as well ???
> > > > 
> > > > On the other hand moving to use the IB CM instead of
> > > emulating it via
> > > > TCP is some progress...
> > > > 
> > > > Or.
> > > > 
> > > > 
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> > > > 
> > > 
> > > 
> 
>