netdev - Re: [PATCH net-next v7 4/5] mvpp2: recycle buffers

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Date:   Sun, 6 Jun 2021 03:59:07 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     netdev@...r.kernel.org, linux-mm@...ck.org,
        Ayush Sawal <ayush.sawal@...lsio.com>,
        Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
        Rohit Maheshwari <rohitm@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        Mirko Lindner <mlindner@...vell.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
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        Andrew Lunn <andrew@...n.ch>, Paolo Abeni <pabeni@...hat.com>,
        Sven Auhagen <sven.auhagen@...eatech.de>
Subject: Re: [PATCH net-next v7 4/5] mvpp2: recycle buffers

On Fri, Jun 4, 2021 at 9:48 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Fri, Jun 04, 2021 at 08:33:48PM +0200, Matteo Croce wrote:
> > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > @@ -3997,7 +3997,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
> >               }
> >
> >               if (pp)
> > -                     page_pool_release_page(pp, virt_to_page(data));
> > +                     skb_mark_for_recycle(skb, virt_to_page(data), pp);
>
> Does this driver only use order-0 pages?  Should it be using
> virt_to_head_page() here?  or should skb_mark_for_recycle() call
> compound_head() internally?

This driver uses only order-0 pages.

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