netdev - Re: [net-next PATCH v4 7/7] net: ravb: Allocate RX buffers via page pool

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Date: Mon, 3 Jun 2024 13:15:38 +0100
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Simon Horman <horms@...nel.org>, Sergey Shtylyov <s.shtylyov@....ru>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
 Biju Das <biju.das.jz@...renesas.com>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
 netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v4 7/7] net: ravb: Allocate RX buffers via page
 pool

On 03/06/2024 13:07, Simon Horman wrote:
> On Mon, Jun 03, 2024 at 09:02:51AM +0100, Paul Barker wrote:
>> On 01/06/2024 11:13, Simon Horman wrote:
>>> On Tue, May 28, 2024 at 04:03:39PM +0100, Paul Barker wrote:
> 
> ...
> 
>>>> @@ -298,13 +269,14 @@ static void ravb_ring_free(struct net_device *ndev, int q)
>>>>  		priv->tx_ring[q] = NULL;
>>>>  	}
>>>>  
>>>> -	/* Free RX skb ringbuffer */
>>>> -	if (priv->rx_skb[q]) {
>>>> -		for (i = 0; i < priv->num_rx_ring[q]; i++)
>>>> -			dev_kfree_skb(priv->rx_skb[q][i]);
>>>> +	/* Free RX buffers */
>>>> +	for (i = 0; i < priv->num_rx_ring[q]; i++) {
>>>> +		if (priv->rx_buffers[q][i].page)
>>>> +			page_pool_put_page(priv->rx_pool[q], priv->rx_buffers[q][i].page, 0, true);
>>>
>>> nit: Networking still prefers code to be 80 columns wide or less.
>>>      It looks like that can be trivially achieved here.
>>>
>>>      Flagged by checkpatch.pl --max-line-length=80
>>
>> Sergey has asked me to wrap to 100 cols [1]. I can only find a reference
>> to 80 in the docs though [2], so I guess you may be right.
>>
>> [1]: https://lore.kernel.org/all/611a49b8-ecdb-6b91-9d3e-262bf3851f5b@omp.ru/
>> [2]: https://www.kernel.org/doc/html/latest/process/coding-style.html
> 
> Hi Paul,
> 
> If Sergey prefers 100 then I won't argue :)
> 
> FWIIW, think what has happened here relates to the Kernel, at some point,
> going from 80 to 100 columns as the preferred maximum width, while Networking
> stuck with 80.

I saw that netdevbpf patchwork is configured for 80 cols and it has
warnings for v4 of this patch [1], so I've already re-wrapped the
changes in this series to 80 cols (excluding a couple of lines where
using slightly more than 80 cols significantly improves readability).
I'm planning to send that in the next hour or so, assuming my tests
pass.

[1]: https://patchwork.kernel.org/project/netdevbpf/patch/20240528150339.6791-8-paul.barker.ct@bp.renesas.com/

-- 
Paul Barker
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