diff mbox series

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

Message ID 20230320213508.2358213-6-martin.blumenstingl@googlemail.com (mailing list archive)
State New, archived
Headers show
Series rtw88: Add SDIO support | expand

Commit Message

Martin Blumenstingl March 20, 2023, 9:35 p.m. UTC
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>
---
Changes since v2:
- none

Changes since v1:
- none


 drivers/net/wireless/realtek/rtw88/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Ping-Ke Shih March 23, 2023, 2:28 a.m. UTC | #1
> -----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 <tony0620emma@gmail.com>; Kalle Valo <kvalo@kernel.org>; Ulf Hansson
> <ulf.hansson@linaro.org>; linux-kernel@vger.kernel.org; netdev@vger.kernel.org;
> linux-mmc@vger.kernel.org; Chris Morgan <macroalpha82@gmail.com>; Nitin Gupta <nitin.gupta981@gmail.com>;
> Neo Jou <neojou@gmail.com>; Ping-Ke Shih <pkshih@realtek.com>; Jernej Skrabec <jernej.skrabec@gmail.com>;
> Larry Finger <Larry.Finger@lwfinger.net>; Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> 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>

> ---
> 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
diff mbox series

Patch

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);