netdev - Re: [PATCH net] net: fec: Use page_pool_put_full

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Date:   Thu, 19 Jan 2023 13:02:10 -0800
From:   Jesse Brandeburg <jesse.brandeburg@...el.com>
To:     <wei.fang@....com>, <shenwei.wang@....com>,
        <xiaoning.wang@....com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>
CC:     <linux-imx@....com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: fec: Use page_pool_put_full_page when freeing rx
 buffers

On 1/18/2023 8:37 PM, wei.fang@....com wrote:
> From: Wei Fang <wei.fang@....com>
> 
> The page_pool_release_page was used when freeing rx buffers, and this
> function just unmaps the page (if mapped) and does not recycle the page.
> So after hundreds of down/up the eth0, the system will out of memory.
> For more details, please refer to the following reproduce steps and
> bug logs. To solve this issue and refer to the doc of page pool, the
> page_pool_put_full_page should be used to replace page_pool_release_page.
> Because this API will try to recycle the page if the page refcnt equal to
> 1. After testing 20000 times, the issue can not be reproduced anymore
> (about testing 391 times the issue will occur on i.MX8MN-EVK before).

I had a look over other users in the kernel and it seems this bug hasn't 
propagated anywhere that I see.

Thanks, for the fix, seems good to me.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>