> > > InfiniBand InfiniBand InfiniBand Verbs > > iWARP InfiniBand iWARP Verbs (subset of IBV, with > > specific connection establishment > > requirements that don't exist with IBV) > > RoCE Ethernet InfiniBand Verbs (but with different > > addressing because of the different > > link layer) > > OPA OPA InfiniBand Verbs > > Verbs is an interface definition to hardware that has been twisted to be a > software API and extended to expose vendor-specific implementation 'features' > as extensions. It is not a transport. > > The device capability bits seems to have evolved to mean: vendor A > implemented some random 'feature' in their hardware and wants all > applications to now check for this 'feature' and change their code to use it. > Basically, what gets defined as a device cap is rather arbitrary. >
This was the point I was trying to make and the reason the OPA MAD support was implemented as a device capability. Ira
