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From:   greearb@candelatech.com
To:     linux-wireless@vger.kernel.org
Cc:     Ben Greear <greearb@candelatech.com>,
        Carson Vandegriffe <carson.vandegriffe@candelatech.com>
Subject: [RFC] Revert "mt76: use IEEE80211_OFFLOAD_ENCAP_ENABLED instead of MT_DRV_AMSDU_OFFLOAD"
Date:   Sat,  1 Oct 2022 07:19:20 -0700
Message-Id: <20221001141920.17592-1-greearb@candelatech.com>
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From: Ben Greear <greearb@candelatech.com>

This reverts commit f17f4864504d754bcbf31e4c89412cdf9946c409.

The reverted commit significantly decreases performance when running
a test where two MTK7915 radios have 16 station vdevs each, configured
for AC mode, and transmitting UDP traffic to AP.

Reported-by: Carson Vandegriffe <carson.vandegriffe@candelatech.com>
Signed-off-by: Ben Greear <greearb@candelatech.com>
---

NOTE:  This patch fixes the performance regression we see, but maybe
there is a better way to fix it.

Test run before this patch:

http://www.candelatech.com/downloads/tr-398-2022-10-01-07-03-52-bad/

After this patch:

http://www.candelatech.com/downloads/tr-398-2022-10-01-07-04-50-good/

 drivers/net/wireless/mediatek/mt76/mac80211.c    | 8 ++++++--
 drivers/net/wireless/mediatek/mt76/mt76.h        | 1 +
 drivers/net/wireless/mediatek/mt76/mt7915/mmio.c | 3 ++-
 drivers/net/wireless/mediatek/mt76/mt7921/pci.c  | 3 ++-
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 088f6de28500..bde99a478777 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -444,8 +444,12 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 	ieee80211_hw_set(hw, SUPPORTS_CLONED_SKBS);
 	ieee80211_hw_set(hw, SUPPORTS_AMSDU_IN_AMPDU);
 	ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER);
-	ieee80211_hw_set(hw, TX_AMSDU);
-	ieee80211_hw_set(hw, TX_FRAG_LIST);
+
+	if (!(dev->drv->drv_flags & MT_DRV_AMSDU_OFFLOAD)) {
+		ieee80211_hw_set(hw, TX_AMSDU);
+		ieee80211_hw_set(hw, TX_FRAG_LIST);
+	}
+
 	ieee80211_hw_set(hw, MFP_CAPABLE);
 	ieee80211_hw_set(hw, AP_LINK_PS);
 	ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 531f52fa282f..82ef26ca5db1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -395,6 +395,7 @@ struct mt76_hw_cap {
 #define MT_DRV_SW_RX_AIRTIME		BIT(2)
 #define MT_DRV_RX_DMA_HDR		BIT(3)
 #define MT_DRV_HW_MGMT_TXQ		BIT(4)
+#define MT_DRV_AMSDU_OFFLOAD		BIT(5)
 
 struct mt76_driver_ops {
 	u32 drv_flags;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
index c41b5b00e939..24c9fda005ca 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
@@ -658,7 +658,8 @@ struct mt7915_dev *mt7915_mmio_probe(struct device *pdev,
 	static const struct mt76_driver_ops drv_ops = {
 		/* txwi_size = txd size + txp size */
 		.txwi_size = MT_TXD_SIZE + sizeof(struct mt76_connac_fw_txp),
-		.drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ,
+		.drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ |
+			     MT_DRV_AMSDU_OFFLOAD,
 		.survey_flags = SURVEY_INFO_TIME_TX |
 				SURVEY_INFO_TIME_RX |
 				SURVEY_INFO_TIME_BSS_RX,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index ea3069d18c35..6a8f43879422 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -231,7 +231,8 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
 	static const struct mt76_driver_ops drv_ops = {
 		/* txwi_size = txd size + txp size */
 		.txwi_size = MT_TXD_SIZE + sizeof(struct mt76_connac_hw_txp),
-		.drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ,
+		.drv_flags = MT_DRV_TXWI_NO_FREE | MT_DRV_HW_MGMT_TXQ |
+			     MT_DRV_AMSDU_OFFLOAD,
 		.survey_flags = SURVEY_INFO_TIME_TX |
 				SURVEY_INFO_TIME_RX |
 				SURVEY_INFO_TIME_BSS_RX,
-- 
2.20.1