rate_control_send_low — helper for drivers for management/no-ack frames
|struct ieee80211_sta * sta,|
|void * priv_sta,|
|struct ieee80211_tx_rate_control * txrc|
struct ieee80211_sta pointer to the target destination. Note that this may be null.
private rate control structure. This may be null.
rate control information we sholud populate for mac80211.
Rate control algorithms that agree to use the lowest rate to send management frames and NO_ACK data with the respective hw retries should use this in the beginning of their mac80211 get_rate callback. If true is returned the rate control can simply return. If false is returned we guarantee that sta and sta and priv_sta is not null.
Rate control algorithms wishing to do more intelligent selection of rate for multicast/broadcast frames may choose to not use this.