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mt76x2: fix transmission of encrypted management frames
Hardware encryption seems to break encrypted unicast mgmt tx. Unfortunately the hardware TXWI header does not have a bit to indicate that a frame is software encrypted, so sw-encrypted frames need to use a different WCID. For that to work, the CCMP PN needs to be generated in software, which makes things a bit slower, so only do it for keys that also need to tx management frames. Signed-off-by: Felix Fietkau <nbd@nbd.name>
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