package/kernel/mac80211/patches/subsys/331-mac80211-do-not-allow-bigger-VHT-MPDUs-than-the-hard.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 17 Sep 2020 12:07:19 +0200
   3 Subject: [PATCH] mac80211: do not allow bigger VHT MPDUs than the hardware
   4  supports
   5
   6 Limit maximum VHT MPDU size by local capability
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/net/mac80211/vht.c
  12 +++ b/net/mac80211/vht.c
  13 @@ -168,10 +168,7 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(stru
  14         /* take some capabilities as-is */
  15         cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
  16         vht_cap->cap = cap_info;
  17 -       vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 |
  18 -                       IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
  19 -                       IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
  20 -                       IEEE80211_VHT_CAP_RXLDPC |
  21 +       vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC |
  22                         IEEE80211_VHT_CAP_VHT_TXOP_PS |
  23                         IEEE80211_VHT_CAP_HTC_VHT |
  24                         IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
  25 @@ -180,6 +177,9 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(stru
  26                         IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
  27                         IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
  28
  29 +       vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK,
  30 +                             own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK);
  31 +
  32         /* and some based on our own capabilities */
  33         switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
  34         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: