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scheduled from the head of the software queue rather than trying to queue the newly given frame. This leads to some rather unfortunate out of order (but still valid as it's inside the BAW) frame TX. This now: * Always queues the frame at the end of the software queue; * Tries to direct dispatch the frame at the head of the software queue, to try and fill up the hardware queue. TODO: * I should likely try to queue as many frames to the hardware as I can at this point, rather than doing one at a time; * ath_tx_xmit_aggr() may fail and this code assumes that it'll schedule the TID. Otherwise TX may stall. PR: kern/166190
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