Re: IPoIB multiqueue support?

[Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>]

 > > As I said, I don't think anyone is working on it.  However it wouldn't
 > > be that hard to get something pretty good for multicast, since the
 > > InfiniBand multicast join mechanism would let you have essentially a
 > > perfect filter for steering individual multicast groups to whichever QP
 > > (ring) you wanted to.

 > Right but then would each individual QP need its own IP address?

No, that's the beauty of multicast -- you just join the multicast group
for a given IP address, and you get the traffic.  Doing multiqueue for
unicast traffic would require some form of flow steering (RSS) in the
adapter (which some have).

 > > Of course you could also implement the equivalent thing in userspace and
 > > probably get even better performance.

 > Start a QP listening to IPoIB mc traffic?

Yes, I believe there have have several proprietary userspace libraries
that essentially do UDP IPoIB multicast in userspace.  There are a few
funky hooks in the IPoIB driver related to that IIRC.

 - R.
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Roland Dreier <rolandd-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org> || For corporate legal information go to:
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