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ath9k: fix transmitting to stations in dynamic SMPS mode 

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
This commit is contained in:
Felix Fietkau 2021-02-14 19:49:11 +01:00 committed by Kalle Valo
parent 773dc50d71
commit 3b9ea7206d
2 changed files with 8 additions and 1 deletions
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3
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -177,7 +177,8 @@ 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;

6
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -1271,6 +1271,11 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf,
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);
@ -2114,6 +2119,7 @@ static void setup_frame_info(struct ieee80211_hw *hw,
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;