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

[Or Gerlitz]

On 6/3/08, Roland Dreier <rdreier at cisco.com> wrote:
>
> given that the real change is to multicast attach and is not a property
> of QPs, wouldn't it be simpler to simply add a flags argument to
> ib_attach_mcast() and use a flag bit to request that messages not be
> looped back per mcast attach?
>

The approach here was that

(A) from application point of view, setting this property per QP and not per
QP per attach to group makes enough sense, specifically, IPoIB wants this
flag to be set for all its attaches since the network stack does loopback in
memory.

and

(B) moving forward with the patches, we'd like to export this feature to
user space, and from the previous threads on "special QP features" (eg XRC,
Low Latency) it sounds like adding some sort of creation flags (even in the
price of new verb such that the existing ABI for qp create still works)
might be the way to go.

Or
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