ath9k: differentiate quality reporting between legacy and HT configurations

We were not differentiating quality between legacy and HT
configurations. We change this to consider the differences.

New theory for reporting quality:

At a hardware RSSI of 45 you will be able to use MCS 7  reliably.
At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
At a hardware RSSI of 35 you should be able use 54 Mbps reliably.

MCS 7  is the highets MCS index usable by a 1-stream device.
MCS 15 is the highest MCS index usable by a 2-stream device.

All ath9k devices are either 1-stream or 2-stream.

How many bars you see is derived from the qual reporting.

A more elaborate scheme can be used here but it requires tables
of SNR/throughput for each possible mode used. For the MCS table
you can refer to the wireless wiki:

http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n

This should fix this bug report:

http://bugzilla.kernel.org/show_bug.cgi?id=13537

Cc: Janath.Peiris@atheros.com
Cc: Matt.Smith@atheros.com
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 25 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 2b2872baaa30..b3da81db453b 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -236,10 +236,31 @@ static int ath_rx_prepare(struct sk_buff *skb, struct ath_desc *ds,
         rx_status->signal = rx_status->noise + ds->ds_rxstat.rs_rssi;
         rx_status->antenna = ds->ds_rxstat.rs_antenna;
 
-        /* at 45 you will be able to use MCS 15 reliably. A more elaborate
-         * scheme can be used here but it requires tables of SNR/throughput for
-         * each possible mode used. */
-        rx_status->qual =  ds->ds_rxstat.rs_rssi * 100 / 45;
+        /*
+         * Theory for reporting quality:
+         *
+         * At a hardware RSSI of 45 you will be able to use MCS 7  reliably.
+         * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
+         * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
+         *
+         * MCS 7  is the highets MCS index usable by a 1-stream device.
+         * MCS 15 is the highest MCS index usable by a 2-stream device.
+         *
+         * All ath9k devices are either 1-stream or 2-stream.
+         *
+         * How many bars you see is derived from the qual reporting.
+         *
+         * A more elaborate scheme can be used here but it requires tables
+         * of SNR/throughput for each possible mode used. For the MCS table
+         * you can refer to the wireless wiki:
+         *
+         * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
+         *
+         */
+        if (conf_is_ht(&hw->conf))
+                rx_status->qual =  ds->ds_rxstat.rs_rssi * 100 / 45;
+        else
+                rx_status->qual =  ds->ds_rxstat.rs_rssi * 100 / 35;
 
         /* rssi can be more than 45 though, anything above that
          * should be considered at 100% */