netdev - Re: [PATCH net-next v3 2/2] bnxt_en: implement netdev_queue_mgmt

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Date: Mon, 24 Jun 2024 15:50:11 -0700
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Michael Chan <michael.chan@...adcom.com>,
 Andy Gospodarek <andrew.gospodarek@...adcom.com>,
 Adrian Alvarado <adrian.alvarado@...adcom.com>,
 Somnath Kotur <somnath.kotur@...adcom.com>, netdev@...r.kernel.org,
 Pavel Begunkov <asml.silence@...il.com>, David Ahern <dsahern@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v3 2/2] bnxt_en: implement netdev_queue_mgmt_ops

On 2024-06-24 15:02, Jakub Kicinski wrote:
> On Mon, 24 Jun 2024 11:20:59 -0700 David Wei wrote:
>>> What's the warning you hit?
>>> We should probably bring back page_pool_unlink_napi(), 
>>> if this is really needed.  
>>
>> This one:
>>
>> https://elixir.bootlin.com/linux/v6.10-rc5/source/net/core/page_pool.c#L1030
>>
>> The cause is having two different bnxt_rx_ring_info referring to the
>> same NAPI instance. One is the proper one in bp->rx_ring, the other is
>> the temporarily allocated one for holding the "replacement" during the
>> reset.
> 
> Makes sense, as I said please look thru the history - some form of
> page_pool_unlink_napi() used to be exported for this use case, but
> Olek(?) deleted it due to lack of in-tree users.
> 
> With that helper in place you can unlink the page pool while the NAPI
> is stopped, without poking into internals at the driver level.

You got it. I'll send as a follow up.