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Re: mac80211 and RX of A-MPDU with missing back agreement

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> [...] I argued that if we have no (or no longer) a BA agreement
> [even if the peer never got the DELBA] we can discard the AMPDU data
> and sent a DELBAs to the HT peer once it tries sent us an A-MPDU
> (again). This is actually what we should do according to 802.11-2012
> 10.5.4 - instead of calling dont_reorder.

I think this is a reasonable interpretation, even though 10.5.4
doesn't explicitly cover this case (since the Ack Policy is set to
Normal Ack).

We can send a DELBA for a number of reasons, and setting the
ReasonCode to UNKNOWN_BA seems appropriate in this case.

/Johan
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