Re: [net-next PATCH v4 11/11] net: airoha: add phylink support for GDM2/3/4

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> Add phylink support for GDM2/3/4 port that require configuration of the
> PCS to make the external PHY or attached SFP cage work.
> 
> These needs to be defined in the GDM port node using the pcs-handle
> property.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
>  drivers/net/ethernet/airoha/airoha_eth.c  | 155 +++++++++++++++++++++-
>  drivers/net/ethernet/airoha/airoha_eth.h  |   3 +
>  drivers/net/ethernet/airoha/airoha_regs.h |  12 ++
>  3 files changed, 169 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> index 16c7896f931f..3be1ae077a76 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.c
> +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> @@ -7,6 +7,7 @@
>  #include <linux/of_net.h>
>  #include <linux/platform_device.h>
>  #include <linux/tcp.h>
> +#include <linux/pcs/pcs.h>
>  #include <linux/u64_stats_sync.h>
>  #include <net/dst_metadata.h>
>  #include <net/page_pool/helpers.h>
> @@ -79,6 +80,11 @@ static bool airhoa_is_lan_gdm_port(struct airoha_gdm_port *port)
>  	return port->id == 1;
>  }
>  
> +static bool airhoa_is_phy_external(struct airoha_gdm_port *port)
> +{
> +	return port->id != 1;
> +}
> +
>  static void airoha_set_macaddr(struct airoha_gdm_port *port, const u8 *addr)
>  {
>  	struct airoha_eth *eth = port->qdma->eth;
> @@ -1613,6 +1619,17 @@ static int airoha_dev_open(struct net_device *dev)
>  	struct airoha_gdm_port *port = netdev_priv(dev);
>  	struct airoha_qdma *qdma = port->qdma;
>  
> +	if (airhoa_is_phy_external(port)) {
> +		err = phylink_of_phy_connect(port->phylink, dev->dev.of_node, 0);

nit: even if it is not strictly required, in order to align with the rest of the
codebase, can you please stay below 79 columns?

> +		if (err) {
> +			netdev_err(dev, "%s: could not attach PHY: %d\n", __func__,
> +				   err);

same here

> +			return err;
> +		}
> +
> +		phylink_start(port->phylink);
> +	}
> +
>  	netif_tx_start_all_queues(dev);
>  	err = airoha_set_vip_for_gdm_port(port, true);
>  	if (err)
> @@ -1665,6 +1682,11 @@ static int airoha_dev_stop(struct net_device *dev)
>  		}
>  	}
>  
> +	if (airhoa_is_phy_external(port)) {
> +		phylink_stop(port->phylink);
> +		phylink_disconnect_phy(port->phylink);
> +	}
> +
>  	return 0;
>  }
>  
> @@ -2795,6 +2817,115 @@ bool airoha_is_valid_gdm_port(struct airoha_eth *eth,
>  	return false;
>  }
>  
> +static void airoha_mac_link_up(struct phylink_config *config, struct phy_device *phy,
> +			       unsigned int mode, phy_interface_t interface,
> +			       int speed, int duplex, bool tx_pause, bool rx_pause)

ditto.

> +{
> +	struct airoha_gdm_port *port = container_of(config, struct airoha_gdm_port,
> +						    phylink_config);

ditto.

> +	struct airoha_qdma *qdma = port->qdma;
> +	struct airoha_eth *eth = qdma->eth;
> +	u32 frag_size_tx, frag_size_rx;
> +
> +	if (port->id != 4)
> +		return;
> +
> +	switch (speed) {
> +	case SPEED_10000:
> +	case SPEED_5000:
> +		frag_size_tx = 8;
> +		frag_size_rx = 8;
> +		break;
> +	case SPEED_2500:
> +		frag_size_tx = 2;
> +		frag_size_rx = 1;
> +		break;
> +	default:
> +		frag_size_tx = 1;
> +		frag_size_rx = 0;
> +	}
> +
> +	/* Configure TX/RX frag based on speed */
> +	airoha_fe_rmw(eth, REG_GDMA4_TMBI_FRAG,
> +		      GDMA4_SGMII0_TX_FRAG_SIZE_MASK,
> +		      FIELD_PREP(GDMA4_SGMII0_TX_FRAG_SIZE_MASK,
> +				 frag_size_tx));
> +
> +	airoha_fe_rmw(eth, REG_GDMA4_RMBI_FRAG,
> +		      GDMA4_SGMII0_RX_FRAG_SIZE_MASK,
> +		      FIELD_PREP(GDMA4_SGMII0_RX_FRAG_SIZE_MASK,
> +				 frag_size_rx));
> +}
> +
> +static const struct phylink_mac_ops airoha_phylink_ops = {
> +	.mac_link_up = airoha_mac_link_up,
> +};
> +
> +static int airoha_setup_phylink(struct net_device *dev)
> +{
> +	struct airoha_gdm_port *port = netdev_priv(dev);
> +	struct device_node *np = dev->dev.of_node;
> +	struct phylink_pcs **available_pcs;
> +	phy_interface_t phy_mode;
> +	struct phylink *phylink;
> +	unsigned int num_pcs;
> +	int err;
> +
> +	err = of_get_phy_mode(np, &phy_mode);
> +	if (err) {
> +		dev_err(&dev->dev, "incorrect phy-mode\n");
> +		return err;
> +	}
> +
> +	port->phylink_config.dev = &dev->dev;
> +	port->phylink_config.type = PHYLINK_NETDEV;
> +	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> +						MAC_10 | MAC_100 | MAC_1000 | MAC_2500FD |
> +						MAC_5000FD | MAC_10000FD;

over 79 columns

> +
> +	err = fwnode_phylink_pcs_parse(dev_fwnode(&dev->dev), NULL, &num_pcs);
> +	if (err)
> +		return err;
> +
> +	available_pcs = kcalloc(num_pcs, sizeof(*available_pcs), GFP_KERNEL);

I guess you can use devm_kcalloc() and get rid of kfree() here.

> +	if (!available_pcs)
> +		return -ENOMEM;
> +
> +	err = fwnode_phylink_pcs_parse(dev_fwnode(&dev->dev), available_pcs,
> +				       &num_pcs);
> +	if (err)
> +		goto out;
> +
> +	port->phylink_config.available_pcs = available_pcs;
> +	port->phylink_config.num_available_pcs = num_pcs;
> +
> +	__set_bit(PHY_INTERFACE_MODE_SGMII,
> +		  port->phylink_config.supported_interfaces);
> +	__set_bit(PHY_INTERFACE_MODE_1000BASEX,
> +		  port->phylink_config.supported_interfaces);
> +	__set_bit(PHY_INTERFACE_MODE_2500BASEX,
> +		  port->phylink_config.supported_interfaces);
> +	__set_bit(PHY_INTERFACE_MODE_USXGMII,
> +		  port->phylink_config.supported_interfaces);
> +
> +	phy_interface_copy(port->phylink_config.pcs_interfaces,
> +			   port->phylink_config.supported_interfaces);
> +
> +	phylink = phylink_create(&port->phylink_config,
> +				 of_fwnode_handle(np),
> +				 phy_mode, &airoha_phylink_ops);
> +	if (IS_ERR(phylink)) {
> +		err = PTR_ERR(phylink);
> +		goto out;
> +	}
> +
> +	port->phylink = phylink;
> +out:
> +	kfree(available_pcs);
> +
> +	return err;
> +}
> +
>  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  				 struct device_node *np, int index)
>  {
> @@ -2873,7 +3004,23 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  	if (err)
>  		return err;
>  
> -	return register_netdev(dev);
> +	if (airhoa_is_phy_external(port)) {
> +		err = airoha_setup_phylink(dev);

This will re-introduce the issue reported here:
https://lore.kernel.org/netdev/5c94b9b3850f7f29ed653e2205325620df28c3ff.1746715755.git.christophe.jaillet@wanadoo.fr/

> +		if (err)
> +			return err;
> +	}
> +
> +	err = register_netdev(dev);
> +	if (err)
> +		goto free_phylink;
> +
> +	return 0;
> +
> +free_phylink:
> +	if (airhoa_is_phy_external(port))
> +		phylink_destroy(port->phylink);
> +
> +	return err;
>  }
>  
>  static int airoha_probe(struct platform_device *pdev)
> @@ -2967,6 +3114,9 @@ static int airoha_probe(struct platform_device *pdev)
>  		struct airoha_gdm_port *port = eth->ports[i];
>  
>  		if (port && port->dev->reg_state == NETREG_REGISTERED) {
> +			if (airhoa_is_phy_external(port))
> +				phylink_destroy(port->phylink);
> +
>  			unregister_netdev(port->dev);
>  			airoha_metadata_dst_free(port);
>  		}
> @@ -2994,6 +3144,9 @@ static void airoha_remove(struct platform_device *pdev)
>  			continue;
>  
>  		airoha_dev_stop(port->dev);
> +		if (airhoa_is_phy_external(port))
> +			phylink_destroy(port->phylink);
> +
>  		unregister_netdev(port->dev);
>  		airoha_metadata_dst_free(port);
>  	}
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
> index 53f39083a8b0..73a500474076 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.h
> +++ b/drivers/net/ethernet/airoha/airoha_eth.h
> @@ -498,6 +498,9 @@ struct airoha_gdm_port {
>  	struct net_device *dev;
>  	int id;
>  
> +	struct phylink *phylink;
> +	struct phylink_config phylink_config;
> +
>  	struct airoha_hw_stats stats;
>  
>  	DECLARE_BITMAP(qos_sq_bmap, AIROHA_NUM_QOS_CHANNELS);
> diff --git a/drivers/net/ethernet/airoha/airoha_regs.h b/drivers/net/ethernet/airoha/airoha_regs.h
> index d931530fc96f..54f7079b28b0 100644
> --- a/drivers/net/ethernet/airoha/airoha_regs.h
> +++ b/drivers/net/ethernet/airoha/airoha_regs.h
> @@ -357,6 +357,18 @@
>  #define IP_FRAGMENT_PORT_MASK		GENMASK(8, 5)
>  #define IP_FRAGMENT_NBQ_MASK		GENMASK(4, 0)
>  
> +#define REG_GDMA4_TMBI_FRAG		0x2028
> +#define GDMA4_SGMII1_TX_WEIGHT_MASK	GENMASK(31, 26)
> +#define GDMA4_SGMII1_TX_FRAG_SIZE_MASK	GENMASK(25, 16)
> +#define GDMA4_SGMII0_TX_WEIGHT_MASK	GENMASK(15, 10)
> +#define GDMA4_SGMII0_TX_FRAG_SIZE_MASK	GENMASK(9, 0)
> +
> +#define REG_GDMA4_RMBI_FRAG		0x202c
> +#define GDMA4_SGMII1_RX_WEIGHT_MASK	GENMASK(31, 26)
> +#define GDMA4_SGMII1_RX_FRAG_SIZE_MASK	GENMASK(25, 16)
> +#define GDMA4_SGMII0_RX_WEIGHT_MASK	GENMASK(15, 10)
> +#define GDMA4_SGMII0_RX_FRAG_SIZE_MASK	GENMASK(9, 0)
> +
>  #define REG_MC_VLAN_EN			0x2100
>  #define MC_VLAN_EN_MASK			BIT(0)
>  
> -- 
> 2.48.1
> 

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