netdev - Re: [PATCH net-next] page_pool: unlink from napi during destroy

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Date:   Fri, 21 Apr 2023 02:30:19 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, jbrouer@...hat.com, hawk@...nel.org,
        ilias.apalodimas@...aro.org, tariqt@...dia.com
Subject: Re: [PATCH net-next] page_pool: unlink from napi during destroy

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Wed, 19 Apr 2023 11:20:06 -0700 you wrote:
> Jesper points out that we must prevent recycling into cache
> after page_pool_destroy() is called, because page_pool_destroy()
> is not synchronized with recycling (some pages may still be
> outstanding when destroy() gets called).
> 
> I assumed this will not happen because NAPI can't be scheduled
> if its page pool is being destroyed. But I missed the fact that
> NAPI may get reused. For instance when user changes ring configuration
> driver may allocate a new page pool, stop NAPI, swap, start NAPI,
> and then destroy the old pool. The NAPI is running so old page
> pool will think it can recycle to the cache, but the consumer
> at that point is the destroy() path, not NAPI.
> 
> [...]

Here is the summary with links:
  - [net-next] page_pool: unlink from napi during destroy
    https://git.kernel.org/netdev/net-next/c/dd64b232deb8

You are awesome, thank you!
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