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

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Message-ID: <20241011101455.00006b35@gmail.com>
Date: Fri, 11 Oct 2024 10:14:55 +0800
From: Furong Xu <0x1207@...il.com>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Jesper
 Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas
 <ilias.apalodimas@...aro.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

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