[ewg] Re: [ofw] SC'09 BOF - Meeting notes

[Liran Liss]

In the past few months of review, the responsibility for rdmaoe
addressing was moved to the rdmacm.
So, any future addressing enhancements can be confined to the rdmacm
module without breaking existing APIs.

RFC 3041 deals with static global IP addresses on the Internet,
especially for portable devices.
rmdaoe allows using link-local GIDs for applications residing on the
same subnet, so I don't see the relevance.
Note that for rdmacm apps, the intention is to map the IP addresses that
were assigned to the host's interfaces.
Please see http://www.t11.org/ftp/t11/pub/fc/study/09-543v0.pdf.

Regarding multicast, current switches will flood the traffic just as any
other non-IP multicast traffic (e.g., fcoe).
Using switches that support multicast pruning for additional ethertypes,
you can optimize the traffic and achieve the same link utilization as
normal IP multicast.
In any case, this is not a correctness issue that prohibits
experimentation with rdmaoe multicast on any network today.
--Liran
 

-----Original Message-----
From: ewg-bounces at lists.openfabrics.org
[mailto:ewg-bounces at lists.openfabrics.org] On Behalf Of Roland Dreier
Sent: Thursday, November 19, 2009 9:35 PM
To: Richard Frank
Cc: ofw at lists.openfabrics.org; OpenFabrics EWG
Subject: Re: [ewg] Re: [ofw] SC'09 BOF - Meeting notes


 > Having lots of testing exposure can help in validating that all the
> edge cases are handled..

To some extent -- but there also needs to be some thinking involved to
make sure that the interface can actually handle future cases.

 > Are there a set of cases that you have in mind ?

For example -- how is multicast going to interact with IGMP on ethernet
switches?  How is address resolution going to be done (current patches
seem to assume that stateless IPv6 link-local addresses contain the
ethernet address, which is not valid if RFC 3041 is used)?  etc

 - R.
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