[openib-general] IB mcast question

[Hal Rosenstock]

On Tue, 2006-08-15 at 14:33, Sean Hefty wrote:
> >Is the IP address only used locally to construct the MGID ? What does
> >the MGID look like ? What signature does it use if any ?
> 
> The IP address may also used be used to lookup routing information in order to
> bind to a local device.  The address is then used locally construct the MGID.
> The MGID looks a lot like the ipoib MGIDs, with a byte 8 being 0x01.

One of the reserved bytes in the MGID is 1 rather than 0 and it's using
an IPv4 signature (0x401b) ?

Where does the qkey come from on the creation of the group ?

-- Hal

> - Sean