rtlwifi: support accurate nullfunc frame tx ack report
In order to realize the keep-alive mechanism in mac80211 stack, reporting accurate tx ack status for nullfunc frame is added in this commit. If current frame is nullfunc frame, we ask firmware to report by filling TX report bit in TX descriptor. After this frame DMA done, TX interrupt is triggered but TX status is unknown at this moment, so enqueue this skb into tx_report->queue. Finally, C2H report will be received if the frame is transmitted successfully or retried over, and then we report to mac80211 with IEEE80211_TX_STAT_ACK flag only if it's successful. Otherwise, if failure or timeout (one second), we report to mac80211 without this flag. Signed-off-by: Tzu-En Huang <tehuang@realtek.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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