netdev - Re: [PATCH net-next 5/7] net: txgbe: support switching mode to 1000BASE-X and SGMII

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Date: Mon, 24 Jul 2023 11:40:12 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: netdev@...r.kernel.org, andrew@...n.ch, hkallweit1@...il.com,
	Jose.Abreu@...opsys.com, mengyuanlou@...-swift.com
Subject: Re: [PATCH net-next 5/7] net: txgbe: support switching mode to
 1000BASE-X and SGMII

On Mon, Jul 24, 2023 at 06:23:39PM +0800, Jiawen Wu wrote:
> @@ -185,6 +186,8 @@ static void txgbe_mac_link_up(struct phylink_config *config,
>  	struct wx *wx = netdev_priv(to_net_dev(config->dev));
>  	u32 txcfg, wdg;
>  
> +	txgbe_enable_sec_tx_path(wx);
> +
>  	txcfg = rd32(wx, WX_MAC_TX_CFG);
>  	txcfg &= ~WX_MAC_TX_CFG_SPEED_MASK;
>  
> @@ -210,8 +213,20 @@ static void txgbe_mac_link_up(struct phylink_config *config,
>  	wr32(wx, WX_MAC_WDG_TIMEOUT, wdg);
>  }
>  
> +static int txgbe_mac_prepare(struct phylink_config *config, unsigned int mode,
> +			     phy_interface_t interface)
> +{
> +	struct wx *wx = netdev_priv(to_net_dev(config->dev));
> +
> +	wr32m(wx, WX_MAC_TX_CFG, WX_MAC_TX_CFG_TE, 0);
> +	wr32m(wx, WX_MAC_RX_CFG, WX_MAC_RX_CFG_RE, 0);
> +
> +	return txgbe_disable_sec_tx_path(wx);

Is there a reason why the sec_tx_path is enabled/disabled asymmetrically?

I would expect the transmit path to be disabled in mac_link_down() and
re-enabled in mac_link_up().

Alternatively, if it just needs to be disabled for reconfiguration,
I would expect it to be disabled in mac_prepare() and re-enabled in
mac_finish().

The disable in mac_prepare() and enable in mac_link_up() just looks
rather strange, because it isn't symmetrical.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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