From 61cb60758a05de1eaf5017e37a099fe52c5cce25 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 20 Apr 2020 16:53:28 +0200
Subject: [PATCH] mt76: mt7615: use larger rx buffers if VHT is supported
Git-commit: 61cb60758a05de1eaf5017e37a099fe52c5cce25
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430

In VHT mode we can receive larger MPDUs. Increasing the buffer size reduces
fragmentation here, which should improve performance.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/mediatek/mt76/mt7615/dma.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/dma.c b/drivers/net/wireless/mediatek/mt76/mt7615/dma.c
index 5cdbe3747901..0b1fbddd1c3f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/dma.c
@@ -192,8 +192,13 @@ static void mt7663_dma_sched_init(struct mt7615_dev *dev)
 int mt7615_dma_init(struct mt7615_dev *dev)
 {
 	int rx_ring_size = MT7615_RX_RING_SIZE;
+	int rx_buf_size = MT_RX_BUF_SIZE;
 	int ret;
 
+	/* Increase buffer size to receive large VHT MPDUs */
+	if (dev->mt76.cap.has_5ghz)
+		rx_buf_size *= 2;
+
 	mt76_dma_attach(&dev->mt76);
 
 	mt76_wr(dev, MT_WPDMA_GLO_CFG,
@@ -234,7 +239,7 @@ int mt7615_dma_init(struct mt7615_dev *dev)
 
 	/* init rx queues */
 	ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MCU], 1,
-			       MT7615_RX_MCU_RING_SIZE, MT_RX_BUF_SIZE,
+			       MT7615_RX_MCU_RING_SIZE, rx_buf_size,
 			       MT_RX_RING_BASE);
 	if (ret)
 		return ret;
@@ -243,7 +248,7 @@ int mt7615_dma_init(struct mt7615_dev *dev)
 	    rx_ring_size /= 2;
 
 	ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MAIN], 0,
-			       rx_ring_size, MT_RX_BUF_SIZE, MT_RX_RING_BASE);
+			       rx_ring_size, rx_buf_size, MT_RX_RING_BASE);
 	if (ret)
 		return ret;
 
-- 
2.16.4