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/freebsd-9.3-release/sys/dev/ath/
H A Dif_ath_tx.cdiff 218240 Thu Feb 03 18:42:49 MST 2011 adrian Modify the TX path to set and use the 11n rate scenario bits.

This isn't strictly required to TX (at least non-agg and non-HT40,
non-short-GI) frames; but as it needs to be done anyway, just get
it done.

Linux ath9k uses the rate scenario style path for -all- packets,
legacy or otherwise. This code does much the same.

Beacon TX still uses the legacy, non-rate-scenario TX descriptor
setup. Ath9k also does this.

This 11n rate scenario path is only called for chips in the AR5416
HAL; legacy chips use the previous interface for TX'ing.

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