Thread (23 messages) flat view 23 messages, 3 authors, 2023-03-27

RE: [PATCH v3 5/9] wifi: rtw88: main: Reserve 8 bytes of extra TX headroom for SDIO cards

From: Ping-Ke Shih <pkshih@realtek.com>
Date: 2023-03-23 02:29:06
Also in: linux-mmc, lkml, netdev

-----Original Message-----
From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Sent: Tuesday, March 21, 2023 5:35 AM
To: linux-wireless@vger.kernel.org
Cc: Yan-Hsuan Chuang <redacted>; Kalle Valo <kvalo@kernel.org>; Ulf Hansson
[off-list ref]; linux-kernel@vger.kernel.org; netdev@vger.kernel.org;
linux-mmc@vger.kernel.org; Chris Morgan [off-list ref]; Nitin Gupta [off-list ref];
Neo Jou [off-list ref]; Ping-Ke Shih [off-list ref]; Jernej Skrabec [off-list ref];
Larry Finger [off-list ref]; Martin Blumenstingl [off-list ref]
Subject: [PATCH v3 5/9] wifi: rtw88: main: Reserve 8 bytes of extra TX headroom for SDIO cards

For SDIO host controllers with DMA support the TX buffer physical memory
address need to be aligned at an 8-byte boundary. Reserve 8 bytes of
extra TX headroom so we can align the data without re-allocating the
transmit buffer.

While here, also remove the TODO comment regarding extra headroom for
USB and SDIO. For SDIO the extra headroom is now handled and for USB it
was not needed so far.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
quoted hunk ↗ jump to hunk
---
Changes since v2:
- none

Changes since v1:
- none


 drivers/net/wireless/realtek/rtw88/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index cdc4703ead5f..1cb553485cff 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2163,9 +2163,11 @@ int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
        int max_tx_headroom = 0;
        int ret;

-       /* TODO: USB & SDIO may need extra room? */
        max_tx_headroom = rtwdev->chip->tx_pkt_desc_sz;

+       if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
+               max_tx_headroom += RTW_SDIO_DATA_PTR_ALIGN;
+
        hw->extra_tx_headroom = max_tx_headroom;
        hw->queues = IEEE80211_NUM_ACS;
        hw->txq_data_size = sizeof(struct rtw_txq);
--
2.40.0
  
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