[ofa-general] Re: [PATCH 1/3] mcast loopback block

[Or Gerlitz]

Roland Dreier wrote:
> MCG attach verb could return whether the "block" succeeded or not.  But
> that might be awkward for the app to handle.
Roland,

This way, each call to the MCG attach verb would be duplicated in the 
code, since if it fails when the "block loopback" param was set it would 
now be called again unset, etc. I think this turns to be more complex 
then doing a query for a cap bit and then setting the block mcast 
through a QP create flag once. To my taste, the fact that the QP create 
flag is used by the driver at the time of MCG attach does not make it a 
more complex implementation.

> Do we have any idea on anyone other than IPoIB who wants this feature?
Yes, we want to use it in a user space multicast app.

Or.