Re: [PATCH] wireless: fix wrong 160/80+80 MHz setting

[Wen Gong <wgong@codeaurora.org>]

On 2020-08-26 22:31, Shay Bar wrote:
> Fix cfg80211_chandef_usable():
> consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
> 
> Based on:
> "Table 9-272 — Setting of the Supported Channel Width Set subfield and
> Extended NSS BW
> Support subfield at a STA transmitting the VHT Capabilities Information 
> field"
> From "Draft P802.11REVmd_D3.0.pdf"
> 
> Signed-off-by: Aviad Brikman <aviad.brikman@celeno.com>
> Signed-off-by: Shay Bar <shay.bar@celeno.com>
> ---
>  net/wireless/chan.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/net/wireless/chan.c b/net/wireless/chan.c
> index 90f0f82cd9ca..a51d11d3be33 100644
> --- a/net/wireless/chan.c
> +++ b/net/wireless/chan.c
> @@ -912,6 +912,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
>         struct ieee80211_sta_vht_cap *vht_cap;
>         struct ieee80211_edmg *edmg_cap;
>         u32 width, control_freq, cap;
> +       bool support_80_80 = false;
> 
>         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
>                 return false;
> @@ -979,9 +980,16 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
>                         return false;
>                 break;
>         case NL80211_CHAN_WIDTH_80P80:
> -               cap = vht_cap->cap & 
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
> +               cap = vht_cap->cap;
> +               support_80_80 =
> +                       ((cap &
> +                         
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
> +                       (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ 
> &&
> +                        cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
> +                       ((cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
> +                                   IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT 
> > 1));
>                 if (chandef->chan->band != NL80211_BAND_6GHZ &&
> -                   cap != 
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> +                   !support_80_80)
>                         return false;
>                 /* fall through */
>         case NL80211_CHAN_WIDTH_80:
> @@ -1001,7 +1009,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
>                         return false;
>                 cap = vht_cap->cap & 
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
>                 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
> -                   cap != 
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
> +                   cap != 
> IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
> +                   !(vht_cap->cap & 
> IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
>                         return false;
in 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

so it should check the Subfield VHT Extended NSS BW Capable in 
vht_cap->vht_mcs firstly, if
it is 0, then not allowed to check IEEE80211_VHT_CAP_EXT_NSS_BW_MASK of 
vht_cap->cap.
please correct me if wrong.

>                 break;
>         default:
> --
> 2.17.1
> 
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