[PATCH] ath11k: enable IEEE80211_VHT_EXT_NSS_BW_CAPABLE if NSS ratio enabled

[Jeff Johnson]

On 10/11/2021 1:30 AM, Wen Gong wrote:
> When NSS ratio enabled reported by firmware, SUPPORTS_VHT_EXT_NSS_BW
> is set in ath11k, meanwhile IEEE80211_VHT_EXT_NSS_BW_CAPABLE also
> need to be set, otherwise it is invalid because spec in IEEE Std
> 802.11™-2016 as below.

Suggest you reference the latest version of the spec, IEEE Std
802.11™‐2020, Table 9-273—Supported VHT-MCS and NSS Set subfields

> 
> Table 9-251—Supported VHT-MCS and NSS Set subfields, it has subfield
> VHT Extended NSS BW Capable, its definition is:
> Indicates whether the STA is capable of interpreting the Extended NSS
> BW Support subfield of the VHT Capabilities Information field.
> 
> dmesg have a message without this patch:
> [ 3143.177810] [5204] mac80211:ieee80211_register_hw:1258: ieee80211 phy0: copying sband (band 1) due to VHT EXT NSS BW flag
> It means mac80211 will set IEEE80211_VHT_EXT_NSS_BW_CAPABLE if ath11k not
> set it in ieee80211_register_hw(). So it is better to set it in ath11k.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
> 
> Signed-off-by: Wen Gong <wgong at codeaurora.org>
> ---
>   drivers/net/wireless/ath/ath11k/mac.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
> index c73b2de11ae3..4c59cea34174 100644
> --- a/drivers/net/wireless/ath/ath11k/mac.c
> +++ b/drivers/net/wireless/ath/ath11k/mac.c
> @@ -4123,6 +4123,10 @@ ath11k_create_vht_cap(struct ath11k *ar, u32 rate_cap_tx_chainmask,
>   	vht_cap.vht_supported = 1;
>   	vht_cap.cap = ar->pdev->cap.vht_cap;
>   
> +	if (ar->pdev->cap.nss_ratio_enabled)
> +		vht_cap.vht_mcs.tx_highest |=
> +			cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
> +
>   	ath11k_set_vht_txbf_cap(ar, &vht_cap.cap);
>   
>   	rxmcs_map = 0;
>