[PATCH v1] mt76: mt7915: wed: find rx token by physical address

[Shengyu Qu]

Hi Shih,

Can you also give this patch a review? Seems I also need to convert to
reverse Xmas tree order for this patch, will do it in next version.

Best regards,
Shengyu

在 2025/2/22 19:38, Shengyu Qu 写道:
> The token id in RxDMAD may be incorrect when it is not the last frame
> due to WED HW bug. Lookup correct token id by physical address in sdp0.
> 
> Downstream patch link: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/737340322ab22b138fd200e020d61ffdbe3e36a9/autobuild/autobuild_5.4_mac80211_release/mt7988_wifi7_mac80211_mlo/package/kernel/mt76/patches/0062-mtk-wifi-mt76-mt7915-wed-find-rx-token-by-physical-a.patch
> 
> Signed-off-by: Peter Chiu <chui-hao.chiu at mediatek.com>
> Signed-off-by: Shengyu Qu <wiagn233 at outlook.com>
> ---
>   drivers/net/wireless/mediatek/mt76/dma.c | 25 +++++++++++++++++++++++-
>   1 file changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
> index 844af16ee551..5bf63014263c 100644
> --- a/drivers/net/wireless/mediatek/mt76/dma.c
> +++ b/drivers/net/wireless/mediatek/mt76/dma.c
> @@ -444,9 +444,32 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
>   	mt76_dma_should_drop_buf(drop, ctrl, buf1, desc_info);
>   
>   	if (mt76_queue_is_wed_rx(q)) {
> +		u32 id, find = 0;
>   		u32 token = FIELD_GET(MT_DMA_CTL_TOKEN, buf1);
> -		struct mt76_txwi_cache *t = mt76_rx_token_release(dev, token);
> +		struct mt76_txwi_cache *t;
> +
> +		if (*more) {
> +			spin_lock_bh(&dev->rx_token_lock);
> +
> +			idr_for_each_entry(&dev->rx_token, t, id) {
> +				if (t->dma_addr == le32_to_cpu(desc->buf0)) {
> +					find = 1;
> +					token = id;
> +
> +					/* Write correct id back to DMA*/
> +					u32p_replace_bits(&buf1, id,
> +							  MT_DMA_CTL_TOKEN);
> +					WRITE_ONCE(desc->buf1, cpu_to_le32(buf1));
> +					break;
> +				}
> +			}
> +
> +			spin_unlock_bh(&dev->rx_token_lock);
> +			if (!find)
> +				return NULL;
> +		}
>   
> +		t = mt76_rx_token_release(dev, token);
>   		if (!t)
>   			return NULL;
>   

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