mac80211: expose txq queue depth and size to drivers
This will allow drivers to make more educated decisions whether to defer transmission or not. Relying on wake_tx_queue() call count implicitly was not possible because it could be called without queued frame count actually changing on software tx aggregation start/stop code paths. It was also not possible to know how long byte-wise queue was without dequeueing. Signed-off-by: NMichal Kazior <michal.kazior@tieto.com> Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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