netdev - RE: RE: [EXT] [BUG] Possible unsafe page

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Date: Thu, 24 Aug 2023 02:49:55 +0000
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Geethasowjanya
 Akula <gakula@...vell.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Subbaraya Sundeep Bhatta
	<sbhatta@...vell.com>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Thomas
 Gleixner <tglx@...utronix.de>,
        Hariprasad Kelam <hkelam@...vell.com>
Subject: RE: RE: [EXT] [BUG] Possible unsafe page_pool usage in octeontx2

> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Sent: Wednesday, August 23, 2023 6:25 PM
> To: Ratheesh Kannoth <rkannoth@...vell.com>
> Subject: Re: RE: [EXT] [BUG] Possible unsafe page_pool usage in octeontx2

> I would suggest to stay away from the lock-less buffer if not in NAPI and feed
> the pool->ring instead.
As Jacub explained, allow_direct will be false as pp->p.napi is 0.
So there is no lockless addition. I think, we don’t have to fix the page pool alloc() in workqueue issue. 
 
-Ratheesh