linux-kernel - RE: [EXT] Re: [PATCH v4 1/2] net: page_pool: export page_pool

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Date:   Tue, 15 Nov 2022 17:18:48 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [EXT] Re: [PATCH v4 1/2] net: page_pool: export page_pool_stats
 definition



> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Tuesday, November 15, 2022 11:12 AM
> To: Shenwei Wang <shenwei.wang@....com>
> Cc: David S. Miller <davem@...emloft.net>; Eric Dumazet
> <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
> <pabeni@...hat.com>; Jesper Dangaard Brouer <hawk@...nel.org>; Ilias
> Apalodimas <ilias.apalodimas@...aro.org>; Alexei Starovoitov
> <ast@...nel.org>; Daniel Borkmann <daniel@...earbox.net>; John Fastabend
> <john.fastabend@...il.com>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; imx@...ts.linux.dev
> Subject: [EXT] Re: [PATCH v4 1/2] net: page_pool: export page_pool_stats
> definition
> 
> Caution: EXT Email
> 
> On Tue, Nov 15, 2022 at 09:57:43AM -0600, Shenwei Wang wrote:
> > The definition of the 'struct page_pool_stats' is required even when
> > the CONFIG_PAGE_POOL_STATS is not defined. Otherwise, it is required
> > the drivers to handle the case of CONFIG_PAGE_POOL_STATS undefined.
> 
> I agree the API is broken, but i think there is a better fix.
> 
> There should be a stub of page_pool_get_stats() for when
> CONFIG_PAGE_POOL_STATS is disabled.
> 
> Nothing actually dereferences struct page_pool_stats when you have this stub.
> So it might be enough to simply have
> 
> struct page_pool_stats{
> };
> 

As the structure is open when the CONFIG_PAGE_POOL_STATS is enabled, you can not
prevent a user to access its members. The empty stub will still have problems in this
kind of situations.

Regards,
Shenwei

>        Andrew