package/kernel/mac80211/patches/subsys/369-mac80211-don-t-set-set-TDLS-STA-bandwidth-wider-than.patch

   1 From ebbd7dc7ca856a182769c17c4c8a739cedc064c4 Mon Sep 17 00:00:00 2001
   2 From: Johannes Berg <johannes.berg@intel.com>
   3 Date: Sun, 6 Dec 2020 14:54:44 +0200
   4 Subject: [PATCH] mac80211: don't set set TDLS STA bandwidth wider than
   5  possible
   6
   7 [ Upstream commit f65607cdbc6b0da356ef5a22552ddd9313cf87a0 ]
   8
   9 When we set up a TDLS station, we set sta->sta.bandwidth solely based
  10 on the capabilities, because the "what's the current bandwidth" check
  11 is bypassed and only applied for other types of stations.
  12
  13 This leads to the unfortunate scenario that the sta->sta.bandwidth is
  14 160 MHz if both stations support it, but we never actually configure
  15 this bandwidth unless the AP is already using 160 MHz; even for wider
  16 bandwidth support we only go up to 80 MHz (at least right now.)
  17
  18 For iwlwifi, this can also lead to firmware asserts, telling us that
  19 we've configured the TX rates for a higher bandwidth than is actually
  20 available due to the PHY configuration.
  21
  22 For non-TDLS, we check against the interface's requested bandwidth,
  23 but we explicitly skip this check for TDLS to cope with the wider BW
  24 case. Change this to
  25  (a) still limit to the TDLS peer's own chandef, which gets factored
  26      into the overall PHY configuration we request from the driver,
  27      and
  28  (b) limit it to when the TDLS peer is authorized, because it's only
  29      factored into the channel context in this case.
  30
  31 Fixes: 504871e602d9 ("mac80211: fix bandwidth computation for TDLS peers")
  32 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  33 Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
  34 Link: https://lore.kernel.org/r/iwlwifi.20201206145305.fcc7d29c4590.I11f77e9e25ddf871a3c8d5604650c763e2c5887a@changeid
  35 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  36 Signed-off-by: Sasha Levin <sashal@kernel.org>
  37 ---
  38  net/mac80211/vht.c | 14 ++++++++++----
  39  1 file changed, 10 insertions(+), 4 deletions(-)
  40
  41 --- a/net/mac80211/vht.c
  42 +++ b/net/mac80211/vht.c
  43 @@ -421,12 +421,18 @@ enum ieee80211_sta_rx_bandwidth ieee8021
  44          * IEEE80211-2016 specification makes higher bandwidth operation
  45          * possible on the TDLS link if the peers have wider bandwidth
  46          * capability.
  47 +        *
  48 +        * However, in this case, and only if the TDLS peer is authorized,
  49 +        * limit to the tdls_chandef so that the configuration here isn't
  50 +        * wider than what's actually requested on the channel context.
  51          */
  52         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
  53 -           test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
  54 -               return bw;
  55 -
  56 -       bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
  57 +           test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) &&
  58 +           test_sta_flag(sta, WLAN_STA_AUTHORIZED) &&
  59 +           sta->tdls_chandef.chan)
  60 +               bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
  61 +       else
  62 +               bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
  63
  64         return bw;
  65  }