netdev - Re: [PATCH net-next v3 4/6] net: ravb: Move the update of ndev->features to ravb_set

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Message-ID: <3747ad9a-217a-2f43-835a-7c23f6a710d2@omp.ru>
Date: Tue, 13 Feb 2024 22:52:25 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<biju.das.jz@...renesas.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v3 4/6] net: ravb: Move the update of
 ndev->features to ravb_set_features()

On 2/13/24 12:41 PM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Commit c2da9408579d ("ravb: Add Rx checksum offload support for GbEth")
> introduced support for setting GbEth features. With this the IP-specific
> features update functions update the ndev->features individually.
> 
> Next commits add runtime PM support for the ravb driver. The runtime PM
> implementation will enable/disable the IP clocks on
> the ravb_open()/ravb_close() functions. Accessing the IP registers with
> clocks disabled blocks the system.
> 
> The ravb_set_features() function could be executed when the Ethernet
> interface is closed so we need to ensure we don't access IP registers while
> the interface is down when runtime PM support will be in place.
> 
> For these, move the update of ndev->features to ravb_set_features() and
> make the IP-specific features set function return int. In this way we
> update the ndev->features only when the IP-specific features set function
> returns success and we can avoid code duplication when introducing
> runtime PM registers protection.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 7a7f743a1fef..b3b91783bb7a 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -2475,7 +2475,7 @@ static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
>  	return 0;
>  }
>  
> -static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
> +static int ravb_set_rx_csum(struct net_device *ndev, bool enable)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	unsigned long flags;
> @@ -2492,6 +2492,8 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
>  	ravb_rcv_snd_enable(ndev);
>  
>  	spin_unlock_irqrestore(&priv->lock, flags);
> +
> +	return 0;
>  }
>  
>  static int ravb_endisable_csum_gbeth(struct net_device *ndev, enum ravb_reg reg,

   Wait! You're not updating the call site of ravb_set_rx_csum(), are you?
It looks like the above 2 hunks aren't needed...

[...]

MBR, Sergey