# Re: 回覆: \[PATCH\] net: ethernet: mtk\_wed: increase WED v2 WDMA RESV\_BUFF to 0x80

- From: Lorenzo Bianconi \<lorenzo@kernel.org\>
- Date: 2026-08-24 09:05:27 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/08/17452265
- Thread: https://ratatoskr.run/netdev/2026/08/17434002/t.md

```text
> Hi Lorenzo,
> 
>     it is only for v2.  v3 changed the hw design and fixed it.  so this RESV_BUFF register was removed  

Hi Rex,

thx for pointing this out. In this case:

Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>

> 
> Thanks
> Rex Lu
> ________________________________________
> 寄件者: Lorenzo Bianconi
> 已傳送: 星期一, 2026 年 8 月 24 日  下午 03:48
> 收件者: Jakub Kicinski
> 副本: Shiji Yang; netdev@vger.kernel.org; Rex Lu (盧建銘); Felix Fietkau; Andrew Lunn; David S. Miller; Eric Dumazet; Paolo Abeni; Matthias Brugger; AngeloGioacchino Del Regno; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-mediatek@lists.infradead.org
> 主旨: Re: [PATCH] net: ethernet: mtk_wed: increase WED v2 WDMA RESV_BUFF to 0x80
> 
> > On Aug 21, Jakub Kicinski wrote:
> > > On Wed, 19 Aug 2026 21:07:07 +0800 Shiji Yang wrote:
> > > > Change WDMA RESV_BUFF from 0x40 to 0x80 to avoid CDM TX FIFO overflow.
> > > > Without this patch mt7986 and mt7981 may have WDMA TX hang issue. This
> > > > patch was pulled from mtk-openwrt-feeds GPL open source project.
> > >
> > > Lorenzo, could you TAL? (incl. Simon's suggestion of the Fixes tag)
> 
> I am wondering if this is necessary for v3 as well.
> @Rex any input on it?
> 
> Regarding Fixes tag, I think cf26df8833cc is the right one.
> 
> Regards,
> Lorenzo
> 
> >
> > sure, I am AFK now, I will review it next week.
> >
> > Regards,
> > Lorenzo
> 
> 
```

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