RE: [PATCH for-next 3/4] IB/core: Support new type of join-state for multicast

["Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

> This doesn't seem to make any sense to me.  Without going back and
> re-reading this part of the spec, as I recall, there is:
> 
> UnJoined
> SendOnly Join
> Full Join

The 1.2.1 version of the spec has:

JoinState - 4 bits

Join/Leave Status requested by the port. See discussion below.
bit 0: FullMember: Include/delete this endport from the multicast group as a
member sender and receiver.
bit 1: NonMember: Include/delete this endport from the multicast group as
a non-member sender and receiver.
bit 2: SendOnlyNonMember: Include/delete this endport from the multicast
group as a non-member sender only.
bit 3: Reserved

• FullMember: Group messages are routed both to and from the port.
The port is considered a member for purposes of group creation and
deletion, i.e.: if no member ports with FullMember=1 remain, the
group may be deleted; otherwise it may not.
• NonMember: Group messages are routed both to and from the port.
The port is not considered a member for purposes of group creation/deletion.
• SendOnlyNonMember: Group messages are only routed from the
port; none are routed to the port. The port is not considered
a member for purposes of group creation/deletion.

Any combination of the MCMemberRecord:JoinState bits may be 1. When
multiple bits are 1, the qualities of the port's type of membership are the
union of the qualities specified by the bits that are 1.
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