[ewg] Which IPv6 multicast group to be used for "mckey" ?

[Vivek Satpute]

Hi,

I did google on this and found the following link:
http://www.mail-archive.com/linux-rdma@vger.kernel.org/msg00953.html

As per above link:

RDMA CM treats AF_INET6 addresses that are either 0 or prefixed with
FF1x:A01B::/32 as MGIDs

1) So, does it mean that mckey works with multicast addresses starting with
FF1x:A01B only ?

2) Again, I did some testing and found that if I use multicast address *
FF12:A01B:0:0:0:0:0:A*
with mckey, then multicast join fails with following error:

#mckey -M FF12:A01B:0:0:0:0:0:A -b fe80::202:c903:0:d1e1
mckey: starting server
mckey: joining
mckey: event: RDMA_CM_EVENT_MULTICAST_ERROR, error: -22
test complete
return status 0

mckey fails if  "X" bit in "FF1X:A01B: .... ", is 2. For any value of X
other than 2, mckey works fine. Can anyone please tell me the reason of this
?

Thanks in advance,
Vivek

On Thu, Mar 11, 2010 at 1:30 PM, Vivek Satpute <vivekonline86 at gmail.com>wrote:

> Hi,
>
> I am new to infiniband technology, so do not have much more exposure of it.
>
> I have installed OFED-1.5 on my machine. I was trying to run mckey
> application
> with following *two different multicast groups*.
>
> mckey -M *FF10:0:0:0:0:0:0:B* -b 10.10.10.1 (receiver)
> mckey -M *FF10:0:0:0:0:0:0:C* -b 10.10.10.2 -s (sender)
>
> Above both multicast groups are different still, data sent by sender
> received
> by receiver on another machine. Why it happens ?
>
> Is there any special format of IPv6 multicast groups for Infiniband ?
>
>
> Thanks in advance,
> Vivek.
>
>
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