netdev - Re: [PATCH net-next v2 2/2] net: stmmac: Move MAC caps init to phylink MAC caps getter

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Message-ID: <c441691f-906d-4f44-10c8-3d8437cd3833@bootlin.com>
Date: Thu, 18 Apr 2024 13:34:06 +0200 (CEST)
From: Romain Gantois <romain.gantois@...tlin.com>
To: Serge Semin <fancer.lancer@...il.com>
cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, 
    Jose Abreu <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
    Paolo Abeni <pabeni@...hat.com>, Russell King <linux@...linux.org.uk>, 
    Yanteng Si <siyanteng@...ngson.cn>, 
    Romain Gantois <romain.gantois@...tlin.com>, 
    Maxime Coquelin <mcoquelin.stm32@...il.com>, 
    Simon Horman <horms@...nel.org>, Huacai Chen <chenhuacai@...nel.org>, 
    Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
    Samuel Holland <samuel@...lland.org>, netdev@...r.kernel.org, 
    linux-stm32@...md-mailman.stormreply.com, 
    linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] net: stmmac: Move MAC caps init to
 phylink MAC caps getter

On Wed, 17 Apr 2024, Serge Semin wrote:

> After a set of recent fixes the stmmac_phy_setup() and
> stmmac_reinit_queues() methods have turned to having some duplicated code.
> Let's get rid from the duplication by moving the MAC-capabilities
> initialization to the PHYLINK MAC-capabilities getter. The getter is
> called during each network device interface open/close cycle. So the
> MAC-capabilities will be initialized in generic device open procedure and
> in case of the Tx/Rx queues re-initialization as the original code
> semantics implies.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
> 
> ---
> 
> Link: https://lore.kernel.org/netdev/20240412180340.7965-5-fancer.lancer@gmail.com/
> Changelog v2:
> - Resubmit the patch to net-next separately from the main patchset (Paolo)
> ---
>  .../net/ethernet/stmicro/stmmac/stmmac_main.c | 36 +++++++++----------
>  1 file changed, 17 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index b810f6b69bf5..0d6cd1704e6a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -936,6 +936,22 @@ static void stmmac_mac_flow_ctrl(struct stmmac_priv *priv, u32 duplex)
>  			priv->pause, tx_cnt);
>  }
>  
> +static unsigned long stmmac_mac_get_caps(struct phylink_config *config,
> +					 phy_interface_t interface)
> +{
> +	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
> +
> +	/* Refresh the MAC-specific capabilities */
> +	stmmac_mac_update_caps(priv);
> +
> +	config->mac_capabilities = priv->hw->link.caps;
> +
> +	if (priv->plat->max_speed)
> +		phylink_limit_mac_speed(config, priv->plat->max_speed);
> +
> +	return config->mac_capabilities;
> +}
> +
>  static struct phylink_pcs *stmmac_mac_select_pcs(struct phylink_config *config,
>  						 phy_interface_t interface)
>  {
> @@ -1105,6 +1121,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
>  }
>  
>  static const struct phylink_mac_ops stmmac_phylink_mac_ops = {
> +	.mac_get_caps = stmmac_mac_get_caps,
>  	.mac_select_pcs = stmmac_mac_select_pcs,
>  	.mac_config = stmmac_mac_config,
>  	.mac_link_down = stmmac_mac_link_down,
> @@ -1204,7 +1221,6 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
>  	int mode = priv->plat->phy_interface;
>  	struct fwnode_handle *fwnode;
>  	struct phylink *phylink;
> -	int max_speed;
>  
>  	priv->phylink_config.dev = &priv->dev->dev;
>  	priv->phylink_config.type = PHYLINK_NETDEV;
> @@ -1225,15 +1241,6 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
>  		xpcs_get_interfaces(priv->hw->xpcs,
>  				    priv->phylink_config.supported_interfaces);
>  
> -	/* Refresh the MAC-specific capabilities */
> -	stmmac_mac_update_caps(priv);
> -
> -	priv->phylink_config.mac_capabilities = priv->hw->link.caps;
> -
> -	max_speed = priv->plat->max_speed;
> -	if (max_speed)
> -		phylink_limit_mac_speed(&priv->phylink_config, max_speed);
> -
>  	fwnode = priv->plat->port_node;
>  	if (!fwnode)
>  		fwnode = dev_fwnode(priv->device);
> @@ -7327,7 +7334,6 @@ int stmmac_reinit_queues(struct net_device *dev, u32 rx_cnt, u32 tx_cnt)
>  {
>  	struct stmmac_priv *priv = netdev_priv(dev);
>  	int ret = 0, i;
> -	int max_speed;
>  
>  	if (netif_running(dev))
>  		stmmac_release(dev);
> @@ -7341,14 +7347,6 @@ int stmmac_reinit_queues(struct net_device *dev, u32 rx_cnt, u32 tx_cnt)
>  			priv->rss.table[i] = ethtool_rxfh_indir_default(i,
>  									rx_cnt);
>  
> -	stmmac_mac_update_caps(priv);
> -
> -	priv->phylink_config.mac_capabilities = priv->hw->link.caps;
> -
> -	max_speed = priv->plat->max_speed;
> -	if (max_speed)
> -		phylink_limit_mac_speed(&priv->phylink_config, max_speed);
> -
>  	stmmac_napi_add(dev);
>  
>  	if (netif_running(dev))
> -- 
> 2.43.0
> 
> 

Reviewed-by: Romain Gantois <romain.gantois@...tlin.com>

Thanks,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com