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ath10k: fix VHT NSS calculation when STBC is enabled 

When STBC is enabled, NSTS_SU value need to be accounted for VHT NSS
calculation for SU case.

Without this fix, 1SS + STBC enabled case was reported wrongly as 2SS
in radiotap header on monitor mode capture.

Tested-on: QCA9984 10.4-3.10-00047

Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1597392971-3897-1-git-send-email-murugana@codeaurora.org
This commit is contained in:
Sathishkumar Muruganandam 2020-08-14 13:46:11 +05:30 committed by Kalle Valo
parent caf275463d
commit 99f41b8e43
1 changed files with 7 additions and 1 deletions
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8
drivers/net/wireless/ath/ath10k/htt_rx.c
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@ -949,6 +949,7 @@ static void ath10k_htt_rx_h_rates(struct ath10k *ar,
u8 preamble = 0; u8 preamble = 0;
u8 group_id; u8 group_id;
u32 info1, info2, info3; u32 info1, info2, info3;
u32 stbc, nsts_su;
info1 = __le32_to_cpu(rxd->ppdu_start.info1); info1 = __le32_to_cpu(rxd->ppdu_start.info1);
info2 = __le32_to_cpu(rxd->ppdu_start.info2); info2 = __le32_to_cpu(rxd->ppdu_start.info2);
@ -993,11 +994,16 @@ static void ath10k_htt_rx_h_rates(struct ath10k *ar,
*/ */
bw = info2 & 3; bw = info2 & 3;
sgi = info3 & 1; sgi = info3 & 1;
stbc = (info2 >> 3) & 1;
group_id = (info2 >> 4) & 0x3F; group_id = (info2 >> 4) & 0x3F;
if (GROUP_ID_IS_SU_MIMO(group_id)) { if (GROUP_ID_IS_SU_MIMO(group_id)) {
mcs = (info3 >> 4) & 0x0F; mcs = (info3 >> 4) & 0x0F;
nss = ((info2 >> 10) & 0x07) + 1; nsts_su = ((info2 >> 10) & 0x07);
if (stbc)
nss = (nsts_su >> 2) + 1;
else
nss = (nsts_su + 1);
} else { } else {
/* Hardware doesn't decode VHT-SIG-B into Rx descriptor /* Hardware doesn't decode VHT-SIG-B into Rx descriptor
* so it's impossible to decode MCS. Also since * so it's impossible to decode MCS. Also since