[PATCHv3 1/2] ath10k: add per peer htt tx stats support for 10.4

[Sven Eckelmann]

On Dienstag, 15. November 2016 22:07:29 CEST akolli at qti.qualcomm.com wrote:
> From: Anilkumar Kolli <akolli at qti.qualcomm.com>
> 
> Per peer tx stats are part of 'HTT_10_4_T2H_MSG_TYPE_PEER_STATS'
> event, Firmware sends one HTT event for every four PPDUs.
> HTT payload has success pkts/bytes, failed pkts/bytes, retry
> pkts/bytes and rate info per ppdu.
> Peer stats are enabled through 'WMI_SERVICE_PEER_STATS',
> which are nowadays enabled by default.
> 
> Parse peer stats and update the tx rate information per STA.
> 
> tx rate, Peer stats are tested on QCA4019 with Firmware version
> 10.4-3.2.1-00028.
> 
> Signed-off-by: Anilkumar Kolli <akolli at qti.qualcomm.com>
> ---

Just played a little bit around with it and an 802.11n client (2x2x). The 
thing I've observed was that MCS 0-7 was reported as MCS rate but the client 
received mostly MCS 8-15.

Guessing from this section

>	if (((txrate.flags == WMI_RATE_PREAMBLE_HT) ||
>	     (txrate.flags == WMI_RATE_PREAMBLE_VHT)) && txrate.mcs > 9) {
>		ath10k_warn(ar, "Invalid mcs %hhd peer stats", txrate.mcs);
>		return;
>	}

it looks like HT rates are reported as 0-9 with an NSS setting (yes, as odd as 
this is). I've printed the values to check it:

[   68.529197] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 5
[   68.529500] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4
[   68.535225] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4
[   68.542290] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4
[   68.549507] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4
[   68.555627] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4
[   68.562652] XXXXX txrate.flags 2, txrate.bw 1, txrate.nss 2, txrate.mcs 4

I don't know this for sure but my next guess is now that following change is 
missing:

@@ -2231,8 +2231,10 @@ ath10k_update_per_peer_tx_stats(struct ath10k *ar,
 	sgi = ATH10K_HW_GI(peer_stats->flags);
 
 	if (((txrate.flags == WMI_RATE_PREAMBLE_HT) ||
-	     (txrate.flags == WMI_RATE_PREAMBLE_VHT)) && txrate.mcs > 9) {
-		ath10k_warn(ar, "Invalid mcs %hhd peer stats", txrate.mcs);
+	     (txrate.flags == WMI_RATE_PREAMBLE_VHT)) &&
+	    (txrate.mcs > 9 || txrate.nss < 1)) {
+		ath10k_warn(ar, "Invalid mcs %hhd nss %hhd peer stats",
+			    txrate.mcs, txrate.nss);
 		return;
 	}
 
@@ -2255,7 +2257,7 @@ ath10k_update_per_peer_tx_stats(struct ath10k *ar,
 		arsta->txrate.legacy = rate;
 	} else if (txrate.flags == WMI_RATE_PREAMBLE_HT) {
 		arsta->txrate.flags = RATE_INFO_FLAGS_MCS;
-		arsta->txrate.mcs = txrate.mcs;
+		arsta->txrate.mcs = txrate.mcs + 8 * (txrate.nss - 1);
 	} else {
 		arsta->txrate.flags = RATE_INFO_FLAGS_VHT_MCS;
 		arsta->txrate.mcs = txrate.mcs;

Funny enough, I was spamming following with my 802.11n!!!! 2x2 client:

[  115.694987] XXXXX txrate.flags 3, txrate.bw 1, txrate.nss 4, txrate.mcs 15
[  115.701851] ath10k_ahb a800000.wifi: Invalid mcs 15 peer stats

Firmware was 10.4-3.2.1-00050 on an Dakota (IPQ401X) board.

Kind regards,
	Sven
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