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From: Ping-Ke Shih <pkshih@realtek.com>
To: <kvalo@kernel.org>
CC: <kevin_yang@realtek.com>, <linux-wireless@vger.kernel.org>
Subject: [PATCH 4/4] wifi: rtw89: pci: enlarge RX DMA buffer to consider size of RX descriptor
Date: Sun, 21 Jan 2024 15:18:26 +0800
Message-ID: <20240121071826.10159-5-pkshih@realtek.com>
In-Reply-To: <20240121071826.10159-1-pkshih@realtek.com>
References: <20240121071826.10159-1-pkshih@realtek.com>
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Hardware puts RX descriptor and packet in RX DMA buffer, so it could be
over one buffer size if packet size is 11454, and then it will be split
into two segments. WiFi 7 chips use larger size of RX descriptor, so
enlarge DMA buffer size according to RX descriptor to have better
performance and simple flow.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/pci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw89/pci.h b/drivers/net/wireless/realtek/rtw89/pci.h
index 0543221b4c58..532f78eaf6df 100644
--- a/drivers/net/wireless/realtek/rtw89/pci.h
+++ b/drivers/net/wireless/realtek/rtw89/pci.h
@@ -997,7 +997,7 @@
 #define RTW89_PCI_TXWD_NUM_MAX		512
 #define RTW89_PCI_TXWD_PAGE_SIZE	128
 #define RTW89_PCI_ADDRINFO_MAX		4
-#define RTW89_PCI_RX_BUF_SIZE		11460
+#define RTW89_PCI_RX_BUF_SIZE		(11454 + 40) /* +40 for rtw89_rxdesc_long_v2 */
 
 #define RTW89_PCI_POLL_BDRAM_RST_CNT	100
 #define RTW89_PCI_MULTITAG		8
-- 
2.25.1