linux-kernel - Re: [PATCH net-next v1] page_pool: check for dma_sync

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Message-ID: <CAC_iWjL7Z6qtOkxXFRUnnOruzQsBNoKeuZ1iStgXJxTJ_P9Axw@mail.gmail.com>
Date: Fri, 11 Oct 2024 08:06:04 +0300
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Furong Xu <0x1207@...il.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Jesper Dangaard Brouer <hawk@...nel.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, xfr@...look.com
Subject: Re: [PATCH net-next v1] page_pool: check for dma_sync_size earlier

Hi Furong,

On Fri, 11 Oct 2024 at 05:15, Furong Xu <0x1207@...il.com> wrote:
>
> On Thu, 10 Oct 2024 19:53:39 +0800, Yunsheng Lin <linyunsheng@...wei.com> wrote:
>
> > Is there any reason that those drivers not to unset the PP_FLAG_DMA_SYNC_DEV
> > when calling page_pool_create()?
> > Does it only need dma sync for some cases and not need dma sync for other
> > cases? if so, why not do the dma sync in the driver instead?
>
> The answer is in this commit:
> https://git.kernel.org/netdev/net/c/5546da79e6cc

I am not sure I am following. Where does the stmmac driver call a sync
with len 0?

Thanks
/Ilias