[PATCH ath-next V14 9/9] wifi: ath12k: add extended NSS bandwidth support for 160 MHz

Pradeep Kumar Chitrapu
2025-05-21T22:46:00Z

Currently rx and tx MCS map for 160 MHz under HE capabilities
are not updating properly, when 160 MHz is configured with NSS
lesser than max NSS support. Fix this by utilizing
nss_ratio_enabled and nss_ratio_info fields sent by firmware
in service ready event.

However, if firmware advertises EXT NSS BW support in VHT caps
as 1(1x2) and when nss_ratio_info indicates 1:1, reset the EXT
NSS BW Support in VHT caps to 0 which indicates 1x1. This is
to avoid incorrectly choosing 1:2 NSS ratio when using the
default VHT caps advertised by firmware.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Signed-off-by: Pradeep Kumar Chitrapu <quic_pradeepc@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
---
drivers/net/wireless/ath/ath12k/mac.c | 33 ++++++++++++++++++++++-----
1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 036ba5b3d682..26472ed265ec 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -2644,8 +2644,10 @@ static void ath12k_peer_assoc_h_he(struct ath12k *ar,
arg->peer_nss = min(link_sta->rx_nss, max_nss);

if (arg->peer_phymode == MODE_11AX_HE160) {
- tx_nss = ath12k_get_nss_160mhz(ar, max_nss);
+ tx_nss = ath12k_get_nss_160mhz(ar, ar->num_tx_chains);
rx_nss = min(arg->peer_nss, tx_nss);
+
+ arg->peer_nss = min(link_sta->rx_nss, ar->num_rx_chains);
arg->peer_bw_rxnss_override = ATH12K_BW_NSS_MAP_ENABLE;

if (!rx_nss) {
@@ -7118,6 +7120,12 @@ ath12k_create_vht_cap(struct ath12k *ar, u32 rate_cap_tx_chainmask,
vht_cap.vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_map);
vht_cap.vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_map);

+ /* Check if the HW supports 1:1 NSS ratio and reset
+ * EXT NSS BW Support field to 0 to indicate 1:1 ratio
+ */
+ if (ar->pdev->cap.nss_ratio_info == WMI_NSS_RATIO_1_NSS)
+ vht_cap.cap &= ~IEEE80211_VHT_CAP_EXT_NSS_BW_MASK;
+
return vht_cap;
}

@@ -7300,11 +7308,12 @@ static void ath12k_mac_set_hemcsmap(struct ath12k *ar,
struct ieee80211_sta_he_cap *he_cap)
{
struct ieee80211_he_mcs_nss_supp *mcs_nss = &he_cap->he_mcs_nss_supp;
- u16 txmcs_map, rxmcs_map;
+ u8 maxtxnss_160 = ath12k_get_nss_160mhz(ar, ar->num_tx_chains);
+ u8 maxrxnss_160 = ath12k_get_nss_160mhz(ar, ar->num_rx_chains);
+ u16 txmcs_map_160 = 0, rxmcs_map_160 = 0;
+ u16 txmcs_map = 0, rxmcs_map = 0;
u32 i;

- rxmcs_map = 0;
- txmcs_map = 0;
for (i = 0; i < 8; i++) {
if (i < ar->num_tx_chains &&
(ar->cfg_tx_chainmask >> cap->tx_chain_mask_shift) & BIT(i))
@@ -7317,12 +7326,24 @@ static void ath12k_mac_set_hemcsmap(struct ath12k *ar,
rxmcs_map |= IEEE80211_HE_MCS_SUPPORT_0_11 << (i * 2);
else
rxmcs_map |= IEEE80211_HE_MCS_NOT_SUPPORTED << (i * 2);
+
+ if (i < maxtxnss_160 &&
+ (ar->cfg_tx_chainmask >> cap->tx_chain_mask_shift) & BIT(i))
+ txmcs_map_160 |= IEEE80211_HE_MCS_SUPPORT_0_11 << (i * 2);
+ else
+ txmcs_map_160 |= IEEE80211_HE_MCS_NOT_SUPPORTED << (i * 2);
+
+ if (i < maxrxnss_160 &&
+ (ar->cfg_tx_chainmask >> cap->tx_chain_mask_shift) & BIT(i))
+ rxmcs_map_160 |= IEEE80211_HE_MCS_SUPPORT_0_11 << (i * 2);
+ else
+ rxmcs_map_160 |= IEEE80211_HE_MCS_NOT_SUPPORTED << (i * 2);
}

mcs_nss->rx_mcs_80 = cpu_to_le16(rxmcs_map & 0xffff);
mcs_nss->tx_mcs_80 = cpu_to_le16(txmcs_map & 0xffff);
- mcs_nss->rx_mcs_160 = cpu_to_le16(rxmcs_map & 0xffff);
- mcs_nss->tx_mcs_160 = cpu_to_le16(txmcs_map & 0xffff);
+ mcs_nss->rx_mcs_160 = cpu_to_le16(rxmcs_map_160 & 0xffff);
+ mcs_nss->tx_mcs_160 = cpu_to_le16(txmcs_map_160 & 0xffff);
}

static void ath12k_mac_copy_he_cap(struct ath12k *ar,
--
2.43.0