Tell the chip the maximum AMPDU size supported by the AP. This greatly
improves the TX speed of RTL8814AU in the 2.4 GHz band. Before: ~90
Mbps. After: ~300 Mbps.
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
---
v2:
- Do this only for RTL8814A.
- Add a comment explaining why this is needed.
---
drivers/net/wireless/realtek/rtw88/mac80211.c | 2 ++
drivers/net/wireless/realtek/rtw88/main.c | 32 +++++++++++++++++++
drivers/net/wireless/realtek/rtw88/main.h | 3 ++
drivers/net/wireless/realtek/rtw88/rtw8814a.c | 11 +++++++
4 files changed, 48 insertions(+)
diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c
index 026fbf4ad9cc..77f9fbe1870c 100644
--- a/drivers/net/wireless/realtek/rtw88/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw88/mac80211.c
@@ -396,6 +396,8 @@ static void rtw_ops_bss_info_changed(struct ieee80211_hw *hw,
if (rtw_bf_support)
rtw_bf_assoc(rtwdev, vif, conf);
+ rtw_set_ampdu_factor(rtwdev, vif, conf);
+
rtw_fw_beacon_filter_config(rtwdev, true, vif);
} else {
rtw_leave_lps(rtwdev);
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 959f56a3cc1a..bc2c1a5a30b3 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2447,6 +2447,38 @@ void rtw_core_enable_beacon(struct rtw_dev *rtwdev, bool enable)
}
}
+void rtw_set_ampdu_factor(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
+ struct ieee80211_bss_conf *bss_conf)
+{
+ const struct rtw_chip_ops *ops = rtwdev->chip->ops;
+ struct ieee80211_sta *sta;
+ u8 factor = 0xff;
+
+ if (!ops->set_ampdu_factor)
+ return;
+
+ rcu_read_lock();
+
+ sta = ieee80211_find_sta(vif, bss_conf->bssid);
+ if (!sta) {
+ rcu_read_unlock();
+ rtw_warn(rtwdev, "%s: failed to find station %pM\n",
+ __func__, bss_conf->bssid);
+ return;
+ }
+
+ if (sta->deflink.vht_cap.vht_supported)
+ factor = u32_get_bits(sta->deflink.vht_cap.cap,
+ IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
+ else if (sta->deflink.ht_cap.ht_supported)
+ factor = sta->deflink.ht_cap.ampdu_factor;
+
+ rcu_read_unlock();
+
+ if (factor != 0xff)
+ ops->set_ampdu_factor(rtwdev, factor);
+}
+
MODULE_AUTHOR("Realtek Corporation");
MODULE_DESCRIPTION("Realtek 802.11ac wireless core module");
MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/wireless/realtek/rtw88/main.h b/drivers/net/wireless/realtek/rtw88/main.h
index 02343e059fd9..f410c554da58 100644
--- a/drivers/net/wireless/realtek/rtw88/main.h
+++ b/drivers/net/wireless/realtek/rtw88/main.h
@@ -878,6 +878,7 @@ struct rtw_chip_ops {
u32 antenna_rx);
void (*cfg_ldo25)(struct rtw_dev *rtwdev, bool enable);
void (*efuse_grant)(struct rtw_dev *rtwdev, bool enable);
+ void (*set_ampdu_factor)(struct rtw_dev *rtwdev, u8 factor);
void (*false_alarm_statistics)(struct rtw_dev *rtwdev);
void (*phy_calibration)(struct rtw_dev *rtwdev);
void (*dpk_track)(struct rtw_dev *rtwdev);
@@ -2272,4 +2273,6 @@ void rtw_update_channel(struct rtw_dev *rtwdev, u8 center_channel,
void rtw_core_port_switch(struct rtw_dev *rtwdev, struct ieee80211_vif *vif);
bool rtw_core_check_sta_active(struct rtw_dev *rtwdev);
void rtw_core_enable_beacon(struct rtw_dev *rtwdev, bool enable);
+void rtw_set_ampdu_factor(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
+ struct ieee80211_bss_conf *bss_conf);
#endif
diff --git a/drivers/net/wireless/realtek/rtw88/rtw8814a.c b/drivers/net/wireless/realtek/rtw88/rtw8814a.c
index cfd35d40d46e..ce8d4e4c6c57 100644
--- a/drivers/net/wireless/realtek/rtw88/rtw8814a.c
+++ b/drivers/net/wireless/realtek/rtw88/rtw8814a.c
@@ -1332,6 +1332,16 @@ static void rtw8814a_cfg_ldo25(struct rtw_dev *rtwdev, bool enable)
{
}
+/* Without this RTL8814A sends too many frames and (some?) 11n AP
+ * can't handle it, resulting in low TX speed. Other chips seem fine.
+ */
+static void rtw8814a_set_ampdu_factor(struct rtw_dev *rtwdev, u8 factor)
+{
+ factor = min_t(u8, factor, IEEE80211_VHT_MAX_AMPDU_256K);
+
+ rtw_write32(rtwdev, REG_AMPDU_MAX_LENGTH, (8192 << factor) - 1);
+}
+
static void rtw8814a_false_alarm_statistics(struct rtw_dev *rtwdev)
{
struct rtw_dm_info *dm_info = &rtwdev->dm_info;
@@ -2051,6 +2061,7 @@ static const struct rtw_chip_ops rtw8814a_ops = {
.set_antenna = NULL,
.cfg_ldo25 = rtw8814a_cfg_ldo25,
.efuse_grant = rtw8814a_efuse_grant,
+ .set_ampdu_factor = rtw8814a_set_ampdu_factor,
.false_alarm_statistics = rtw8814a_false_alarm_statistics,
.phy_calibration = rtw8814a_phy_calibration,
.cck_pd_set = rtw8814a_phy_cck_pd_set,
--
2.49.0
