The "support_80_80" and "support_160" setting is 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"
-----Original Message-----
From: Shay Bar <shay.bar@xxxxxxxxxx>
Sent: Sunday, 9 February 2020 17:28
To: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx; Shay Bar <Shay.Bar@xxxxxxxxxx>; Aviad Brikman <Aviad.Brikman@xxxxxxxxxx>
Subject: [PATCH] [PATCH] mac80211: fix wrong 160/80+80 Mhz setting
External Email
Before this patch, STA's would set new width of 160/80+80 Mhz based on AP capability only.
This is wrong because STA may not support > 80Mhz BW.
Fix is to verify STA has 160/80+80 Mhz capability before increasing its width to > 80Mhz.
Signed-off-by: Aviad Brikman <aviad.brikman@xxxxxxxxxx>
Signed-off-by: Shay Bar <shay.bar@xxxxxxxxxx>
---
net/mac80211/util.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 32a7a53833c0..950fa4741d98 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2987,10 +2987,22 @@ bool ieee80211_chandef_vht_oper(struct ieee80211_hw *hw,
int cf0, cf1;
int ccfs0, ccfs1, ccfs2;
int ccf0, ccf1;
+ u32 vht_cap;
+ bool support_80_80 = false;
+ bool support_160 = false;
if (!oper || !htop)
return false;
+ vht_cap = hw->wiphy->bands[chandef->chan->band]->vht_cap.cap;
+ support_160 = (vht_cap & (IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK |
+ IEEE80211_VHT_CAP_EXT_NSS_BW_MASK));
+ support_80_80 = ((vht_cap &
+ IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
+ (vht_cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
+ vht_cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
+ ((vht_cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
+ IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT > 1));
ccfs0 = oper->center_freq_seg0_idx;
ccfs1 = oper->center_freq_seg1_idx;
ccfs2 = (le16_to_cpu(htop->operation_mode) &
@@ -3018,10 +3030,10 @@ bool ieee80211_chandef_vht_oper(struct ieee80211_hw *hw,
unsigned int diff;
diff = abs(ccf1 - ccf0);
- if (diff == 8) {
+ if ((diff == 8) && support_160) {
new.width = NL80211_CHAN_WIDTH_160;
new.center_freq1 = cf1;
- } else if (diff > 8) {
+ } else if ((diff > 8) && support_80_80) {
new.width = NL80211_CHAN_WIDTH_80P80;
new.center_freq2 = cf1;
}
--
2.17.1
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