The A-MPDU retransmission rate is always high (> 20%) even in a very
clean environment. However, the vendor driver retransimission rate is
< 10% in the same test bed. The different is the vendor driver starts
the A-MPDU TXOP with initial RTS/CTS handshake which is observed in the
air capture and the TX descriptor. Since there's no related field in
TX descriptor to enable the L-SIG TXOP protection and the duration,
applying the RTS/CTS protection instead helps to lower the retransmission
rate from > 20% to ~12% in the same test setup.
Signed-off-by: Chris Chiu <chris.chiu@xxxxxxxxxxxxx>
---
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index a42e2081b75f..06d59ffb7444 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -4859,7 +4859,7 @@ rtl8xxxu_fill_txdesc_v1(struct ieee80211_hw *hw, struct ieee80211_hdr *hdr,
* rts_rate is zero if RTS/CTS or CTS to SELF are not enabled
*/
tx_desc->txdw4 |= cpu_to_le32(rts_rate << TXDESC32_RTS_RATE_SHIFT);
- if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
+ if (ampdu_enable || (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS)) {
tx_desc->txdw4 |= cpu_to_le32(TXDESC32_RTS_CTS_ENABLE);
tx_desc->txdw4 |= cpu_to_le32(TXDESC32_HW_RTS_ENABLE);
} else if (rate_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
@@ -4930,7 +4930,7 @@ rtl8xxxu_fill_txdesc_v2(struct ieee80211_hw *hw, struct ieee80211_hdr *hdr,
/*
* rts_rate is zero if RTS/CTS or CTS to SELF are not enabled
*/
- if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
+ if (ampdu_enable || (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS)) {
tx_desc40->txdw3 |= cpu_to_le32(TXDESC40_RTS_CTS_ENABLE);
tx_desc40->txdw3 |= cpu_to_le32(TXDESC40_HW_RTS_ENABLE);
} else if (rate_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
--
2.25.1
