netdev - Re: [PATCH net-next] gve: change to use page_pool_put_full

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Message-ID: <CAEAWyHewCMmWmA16jdPiT6pQvwFX88JOtAyzKJHXzRBFogdyPg@mail.gmail.com>
Date: Thu, 24 Oct 2024 10:58:47 -0700
From: Harshitha Ramamurthy <hramamurthy@...gle.com>
To: Simon Horman <horms@...nel.org>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>, 
	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, andrew+netdev@...n.ch, willemb@...gle.com, 
	jeroendb@...gle.com, shailend@...gle.com, ziweixiao@...gle.com, 
	jacob.e.keller@...el.com
Subject: Re: [PATCH net-next] gve: change to use page_pool_put_full_page when
 recycling pages

On Thu, Oct 24, 2024 at 8:45 AM Simon Horman <horms@...nel.org> wrote:
>
> On Thu, Oct 24, 2024 at 10:36:02AM +0800, Yunsheng Lin wrote:
> > On 2024/10/24 6:11, Praveen Kaligineedi wrote:
> > > From: Harshitha Ramamurthy <hramamurthy@...gle.com>
> > >
> > > The driver currently uses page_pool_put_page() to recycle
> > > page pool pages. Since gve uses split pages, if the fragment
> > > being recycled is not the last fragment in the page, there
> > > is no dma sync operation. When the last fragment is recycled,
> > > dma sync is performed by page pool infra according to the
> > > value passed as dma_sync_size which right now is set to the
> > > size of fragment.
> > >
> > > But the correct thing to do is to dma sync the entire page when
> > > the last fragment is recycled. Hence change to using
> > > page_pool_put_full_page().
> >
> > I am not sure if Fixes tag is needed if the blamed commit is only
> > in the net-next tree. Otherwise, LGTM.
>
> I think it would be best to provide a fixes tag in this case.
> It can be done by supplying it in a response to this email thread.
> (I think it needs to start at the beginning of a line.)

Thanks Yunsheng and Simon. I wasn't sure since this patch was targeted
for net-next. I have provided a Fixes tag below.
>
> > Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
> >
> > >
> > > Link: https://lore.kernel.org/netdev/89d7ce83-cc1d-4791-87b5-6f7af29a031d@huawei.com/
> > >
Fixes: ebdfae0d377b ("gve: adopt page pool for DQ RDA mode")
> > > Suggested-by: Yunsheng Lin <linyunsheng@...wei.com>
> > > Reviewed-by: Praveen Kaligineedi <pkaligineedi@...gle.com>
> > > Reviewed-by: Willem de Bruijn <willemb@...gle.com>
> > > Signed-off-by: Harshitha Ramamurthy <hramamurthy@...gle.com>
>
> ...