package/kernel/mac80211/patches/ath/560-ath9k-fix-transmitting-to-stations-in-dynamic-SMPS-m.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Sun, 14 Feb 2021 19:45:50 +0100
   3 Subject: [PATCH] ath9k: fix transmitting to stations in dynamic SMPS mode
   4
   5 When transmitting to a receiver in dynamic SMPS mode, all transmissions that
   6 use multiple spatial streams need to be sent using CTS-to-self or RTS/CTS to
   7 give the receiver's extra chains some time to wake up.
   8 This fixes the tx rate getting stuck at <= MCS7 for some clients, especially
   9 Intel ones, which make aggressive use of SMPS.
  10
  11 Cc: stable@vger.kernel.org
  12 Reported-by: Martin Kennedy <hurricos@gmail.com>
  13 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  14 ---
  15
  16 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
  17 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
  18 @@ -179,7 +179,8 @@ struct ath_frame_info {
  19         s8 txq;
  20         u8 keyix;
  21         u8 rtscts_rate;
  22 -       u8 retries : 7;
  23 +       u8 retries : 6;
  24 +       u8 dyn_smps : 1;
  25         u8 baw_tracked : 1;
  26         u8 tx_power;
  27         enum ath9k_key_type keytype:2;
  28 --- a/drivers/net/wireless/ath/ath9k/xmit.c
  29 +++ b/drivers/net/wireless/ath/ath9k/xmit.c
  30 @@ -1271,6 +1271,11 @@ static void ath_buf_set_rate(struct ath_
  31                                  is_40, is_sgi, is_sp);
  32                         if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
  33                                 info->rates[i].RateFlags |= ATH9K_RATESERIES_STBC;
  34 +                       if (rix >= 8 && fi->dyn_smps) {
  35 +                               info->rates[i].RateFlags |=
  36 +                                       ATH9K_RATESERIES_RTS_CTS;
  37 +                               info->flags |= ATH9K_TXDESC_CTSENA;
  38 +                       }
  39
  40                         info->txpower[i] = ath_get_rate_txpower(sc, bf, rix,
  41                                                                 is_40, false);
  42 @@ -2114,6 +2119,7 @@ static void setup_frame_info(struct ieee
  43                 fi->keyix = an->ps_key;
  44         else
  45                 fi->keyix = ATH9K_TXKEYIX_INVALID;
  46 +       fi->dyn_smps = sta && sta->smps_mode == IEEE80211_SMPS_DYNAMIC;
  47         fi->keytype = keytype;
  48         fi->framelen = framelen;
  49         fi->tx_power = txpower;