Hi Marc,You can set NO_ACK bit in Tx descriptor of each packet to indicate the hardware to not to wait for ACK, which in turn avoids retries for that particular packet.
If you set IEEE80211_TX_CTL_NO_ACK flag in tx_ctl information, ath9k layer will take care of setting the Tx descriptor flag ATH9K_TXDESC_NOACK.
Regards Pradeep
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