From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Felix Fietkau nbd@nbd.name
commit 3b9ea7206d7e1fdd7419cbd10badd3b2c80d04b4 upstream.
When transmitting to a receiver in dynamic SMPS mode, all transmissions that use multiple spatial streams need to be sent using CTS-to-self or RTS/CTS to give the receiver's extra chains some time to wake up. This fixes the tx rate getting stuck at <= MCS7 for some clients, especially Intel ones, which make aggressive use of SMPS.
Cc: stable@vger.kernel.org Reported-by: Martin Kennedy hurricos@gmail.com Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/20210214184911.96702-1-nbd@nbd.name Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/ath/ath9k/ath9k.h | 3 ++- drivers/net/wireless/ath/ath9k/xmit.c | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -179,7 +179,8 @@ struct ath_frame_info { s8 txq; u8 keyix; u8 rtscts_rate; - u8 retries : 7; + u8 retries : 6; + u8 dyn_smps : 1; u8 baw_tracked : 1; u8 tx_power; enum ath9k_key_type keytype:2; --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -1314,6 +1314,11 @@ static void ath_buf_set_rate(struct ath_ is_40, is_sgi, is_sp); if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC)) info->rates[i].RateFlags |= ATH9K_RATESERIES_STBC; + if (rix >= 8 && fi->dyn_smps) { + info->rates[i].RateFlags |= + ATH9K_RATESERIES_RTS_CTS; + info->flags |= ATH9K_TXDESC_CTSENA; + }
info->txpower[i] = ath_get_rate_txpower(sc, bf, rix, is_40, false); @@ -2178,6 +2183,7 @@ static void setup_frame_info(struct ieee fi->keyix = an->ps_key; else fi->keyix = ATH9K_TXKEYIX_INVALID; + fi->dyn_smps = sta && sta->smps_mode == IEEE80211_SMPS_DYNAMIC; fi->keytype = keytype; fi->framelen = framelen; fi->tx_power = txpower;