netdev - Re: issue with inflight pages from page

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Date:   Wed, 19 Apr 2023 10:12:42 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jesper Dangaard Brouer <jbrouer@...hat.com>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>, brouer@...hat.com,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        hawk@...nel.org, ilias.apalodimas@...aro.org, davem@...emloft.net,
        pabeni@...hat.com, bpf@...r.kernel.org,
        lorenzo.bianconi@...hat.com, nbd@....name,
        Toke Hoiland Jorgensen <toke@...hat.com>
Subject: Re: issue with inflight pages from page_pool

On Wed, 19 Apr 2023 17:36:20 +0200 Jesper Dangaard Brouer wrote:
> This reminds me that Jakub's recent defer patches returning pages
> 'directly' to the page_pool alloc-cache, will actually result in this
> kind of bug.  This is because page_pool_destroy() assumes that pages
> cannot be returned to alloc-cache, as driver will have "disconnected" RX
> side.  We need to address this bug separately. 

Mm, I think you're right. The NAPI can get restarted with a different
page pool and the old page pool will still think it's in use.