[ofa-general] Re: [PATCH 2/3] mcast loopback block

[Or Gerlitz]

Roland Dreier wrote:
> Yes, it's adequate for the current use but I'm wondering why we want to
> choose a more complex implementation that hides hardware capabilities?
I tend to think the suggested way is somehow simpler (vs. the per 
attach) see my reply on "patch 1/3"
> It's just as easy to add a flag to the multicast attach verb -- maybe
> easier, in fact, since there are 16 reserved bits in struct
> ib_uverbs_attach_mcast.
I am concerned about both libibverbs --- uverbs ABI and the app -- 
libibverbs ABI

I understand that with this suggestion of yours, the libibverbs API/ABI 
of MCG attach to apps would change, isn't it something we want to avoid, 
eg through introducing a new verbs create_qp_ext that gets also creation 
flag?

Or.