netdev - Re: [PATCH net-next] net: ethernet: mtk_wed: get rid of queue lock for rx queue

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Message-ID: <Y70rX3Nzi7A6y0Lr@lore-desk>
Date:   Tue, 10 Jan 2023 10:09:51 +0100
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     Alexander H Duyck <alexander.duyck@...il.com>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        sujuan.chen@...iatek.com, daniel@...rotopia.org
Subject: Re: [PATCH net-next] net: ethernet: mtk_wed: get rid of queue lock
 for rx queue

> On Sat, 2023-01-07 at 15:41 +0100, Lorenzo Bianconi wrote:
> > mtk_wed_wo_queue_rx_clean and mtk_wed_wo_queue_refill routines can't run
> > concurrently so get rid of spinlock for rx queues.
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> 
> My understanding is that mtk_wed_wo_queue_refill will only be called
> during init and by the tasklet. The mtk_wed_wo_queue_rx_clean function
> is only called during deinit and only after the tasklet has been
> disabled. That is the reason they cannot run at the same time correct?

correct

> 
> It would be nice if you explained why they couldn't run concurrently
> rather than just stating it is so in the patch description. It makes it
> easier to verify assumptions that way. Otherwise the patch itself looks
> good to me.

ack, right. I will update the commit message in v2.

Regards,
Lorenzo

> 
> Reviewed-by: Alexander Duyck <alexanderduyck@...com>
> 

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