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ath9k: move qual processing into a helper
This moves the qual computing into a small helper, ath9k_compute_qual() Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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21b2273806
@ -189,6 +189,47 @@ static u8 ath9k_process_rate(struct ath_common *common,
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return 0;
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}
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/*
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* Theory for reporting quality:
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*
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* At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
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* At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
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* At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
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*
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* MCS 7 is the highets MCS index usable by a 1-stream device.
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* MCS 15 is the highest MCS index usable by a 2-stream device.
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*
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* All ath9k devices are either 1-stream or 2-stream.
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*
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* How many bars you see is derived from the qual reporting.
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*
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* A more elaborate scheme can be used here but it requires tables
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* of SNR/throughput for each possible mode used. For the MCS table
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* you can refer to the wireless wiki:
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*
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* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
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*
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*/
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static int ath9k_compute_qual(struct ieee80211_hw *hw,
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struct ath_rx_status *rx_stats)
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{
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int qual;
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if (conf_is_ht(&hw->conf))
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qual = rx_stats->rs_rssi * 100 / 45;
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else
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qual = rx_stats->rs_rssi * 100 / 35;
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/*
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* rssi can be more than 45 though, anything above that
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* should be considered at 100%
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*/
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if (qual > 100)
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qual = 100;
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return qual;
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}
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/*
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* For Decrypt or Demic errors, we only mark packet status here and always push
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* up the frame up to let mac80211 handle the actual error case, be it no
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@ -247,38 +288,7 @@ static int ath_rx_prepare(struct ath_common *common,
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rx_status->noise = common->ani.noise_floor;
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rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
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rx_status->antenna = rx_stats->rs_antenna;
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/*
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* Theory for reporting quality:
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*
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* At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
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* At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
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* At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
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*
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* MCS 7 is the highets MCS index usable by a 1-stream device.
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* MCS 15 is the highest MCS index usable by a 2-stream device.
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*
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* All ath9k devices are either 1-stream or 2-stream.
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*
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* How many bars you see is derived from the qual reporting.
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*
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* A more elaborate scheme can be used here but it requires tables
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* of SNR/throughput for each possible mode used. For the MCS table
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* you can refer to the wireless wiki:
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*
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* http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
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*
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*/
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if (conf_is_ht(&hw->conf))
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rx_status->qual = rx_stats->rs_rssi * 100 / 45;
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else
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rx_status->qual = rx_stats->rs_rssi * 100 / 35;
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/* rssi can be more than 45 though, anything above that
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* should be considered at 100% */
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if (rx_status->qual > 100)
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rx_status->qual = 100;
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rx_status->qual = ath9k_compute_qual(hw, rx_stats);
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rx_status->flag |= RX_FLAG_TSFT;
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return 1;
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