package/kernel/mac80211/patches/subsys/330-mac80211-allow-bigger-A-MSDU-sizes-in-VHT-even-if-HT.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 16 Sep 2020 18:43:46 +0200
   3 Subject: [PATCH] mac80211: allow bigger A-MSDU sizes in VHT, even if HT is
   4  limited
   5
   6 Some APs (e.g. Asus RT-AC88U) have been observed to report an HT MSDU size
   7 limit of 3839 and a VHT limit of 7991. These APs can handle bigger frames
   8 than 3839 bytes just fine, so we should remove the VHT limit based on the
   9 HT capabilities. This improves tx throughput.
  10
  11 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  12 ---
  13
  14 --- a/net/mac80211/vht.c
  15 +++ b/net/mac80211/vht.c
  16 @@ -315,10 +315,6 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(stru
  17
  18         sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
  19
  20 -       /* If HT IE reported 3839 bytes only, stay with that size. */
  21 -       if (sta->sta.max_amsdu_len == IEEE80211_MAX_MPDU_LEN_HT_3839)
  22 -               return;
  23 -
  24         switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
  25         case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
  26                 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;