[net-next PATCH 0/2] net: airoha: initial phylink support

[net-next PATCH 0/2] net: airoha: initial phylink support

[Christian Marangi]

This trivial patch adds the initial phylink support. It's expected
in the future to add the dedicated PCS for the other GDM port.

This is to give consistent data when running ethtool on the GDM1
port instead of the "No Data"

Christian Marangi (2):
  net: airoha: use device_set_node helper to setup GDM node
  net: airoha: add phylink support for GDM1

 drivers/net/ethernet/airoha/airoha_eth.c | 110 ++++++++++++++++++++---
 drivers/net/ethernet/airoha/airoha_eth.h |   3 +
 2 files changed, 100 insertions(+), 13 deletions(-)

-- 
2.51.0

[net-next PATCH 1/2] net: airoha: use device_set_node helper to setup GDM node

[Christian Marangi]

Use device_set_node helper to setup GDM node instead of manually setting
the dev.of_node to also fill the fwnode entry.

This is to address some API that use fwnode instead of of_node (for
example phylink_create)

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 8483ea02603e..ce6d13b10e27 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -2904,7 +2904,7 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
 			   NETIF_F_HW_TC;
 	dev->features |= dev->hw_features;
 	dev->vlan_features = dev->hw_features;
-	dev->dev.of_node = np;
+	device_set_node(&dev->dev, of_fwnode_handle(np));
 	dev->irq = qdma->irq_banks[0].irq;
 	SET_NETDEV_DEV(dev, eth->dev);
 
-- 
2.51.0

[net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Christian Marangi]

In preparation for support of GDM2+ port, fill in phylink OPs for GDM1
that is an INTERNAL port for the Embedded Switch.

Rework the GDM init logic by first preparing the struct with all the
required info and creating the phylink interface and only after the
parsing register the related netdev.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 108 ++++++++++++++++++++---
 drivers/net/ethernet/airoha/airoha_eth.h |   3 +
 2 files changed, 99 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index ce6d13b10e27..fc237775a998 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -1613,6 +1613,8 @@ static int airoha_dev_open(struct net_device *dev)
 	struct airoha_gdm_port *port = netdev_priv(dev);
 	struct airoha_qdma *qdma = port->qdma;
 
+	phylink_start(port->phylink);
+
 	netif_tx_start_all_queues(dev);
 	err = airoha_set_vip_for_gdm_port(port, true);
 	if (err)
@@ -1665,6 +1667,8 @@ static int airoha_dev_stop(struct net_device *dev)
 		}
 	}
 
+	phylink_stop(port->phylink);
+
 	return 0;
 }
 
@@ -2813,6 +2817,17 @@ static const struct ethtool_ops airoha_ethtool_ops = {
 	.get_link		= ethtool_op_get_link,
 };
 
+static struct phylink_pcs *airoha_phylink_mac_select_pcs(struct phylink_config *config,
+							 phy_interface_t interface)
+{
+	return NULL;
+}
+
+static void airoha_mac_config(struct phylink_config *config, unsigned int mode,
+			      const struct phylink_link_state *state)
+{
+}
+
 static int airoha_metadata_dst_alloc(struct airoha_gdm_port *port)
 {
 	int i;
@@ -2857,6 +2872,55 @@ 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)
+{
+}
+
+static void airoha_mac_link_down(struct phylink_config *config, unsigned int mode,
+				 phy_interface_t interface)
+{
+}
+
+static const struct phylink_mac_ops airoha_phylink_ops = {
+	.mac_select_pcs = airoha_phylink_mac_select_pcs,
+	.mac_config = airoha_mac_config,
+	.mac_link_up = airoha_mac_link_up,
+	.mac_link_down = airoha_mac_link_down,
+};
+
+static int airoha_setup_phylink(struct net_device *netdev)
+{
+	struct airoha_gdm_port *port = netdev_priv(netdev);
+	struct device *dev = &netdev->dev;
+	phy_interface_t phy_mode;
+	struct phylink *phylink;
+
+	phy_mode = device_get_phy_mode(dev);
+	if (phy_mode < 0) {
+		dev_err(dev, "incorrect phy-mode\n");
+		return phy_mode;
+	}
+
+	port->phylink_config.dev = dev;
+	port->phylink_config.type = PHYLINK_NETDEV;
+	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+						MAC_10000FD;
+
+	__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+		  port->phylink_config.supported_interfaces);
+
+	phylink = phylink_create(&port->phylink_config, dev_fwnode(dev),
+				 phy_mode, &airoha_phylink_ops);
+	if (IS_ERR(phylink))
+		return PTR_ERR(phylink);
+
+	port->phylink = phylink;
+
+	return 0;
+}
+
 static int airoha_alloc_gdm_port(struct airoha_eth *eth,
 				 struct device_node *np, int index)
 {
@@ -2931,19 +2995,30 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
 	port->id = id;
 	eth->ports[p] = port;
 
-	err = airoha_metadata_dst_alloc(port);
-	if (err)
-		return err;
+	return airoha_metadata_dst_alloc(port);
+}
 
-	err = register_netdev(dev);
-	if (err)
-		goto free_metadata_dst;
+static int airoha_register_gdm_ports(struct airoha_eth *eth)
+{
+	int i;
 
-	return 0;
+	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
+		struct airoha_gdm_port *port = eth->ports[i];
+		int err;
 
-free_metadata_dst:
-	airoha_metadata_dst_free(port);
-	return err;
+		if (!port)
+			continue;
+
+		err = airoha_setup_phylink(port->dev);
+		if (err)
+			return err;
+
+		err = register_netdev(port->dev);
+		if (err)
+			return err;
+	}
+
+	return 0;
 }
 
 static int airoha_probe(struct platform_device *pdev)
@@ -3034,6 +3109,10 @@ static int airoha_probe(struct platform_device *pdev)
 		}
 	}
 
+	err = airoha_register_gdm_ports(eth);
+	if (err)
+		goto error_napi_stop;
+
 	return 0;
 
 error_napi_stop:
@@ -3047,10 +3126,14 @@ static int airoha_probe(struct platform_device *pdev)
 	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
 		struct airoha_gdm_port *port = eth->ports[i];
 
-		if (port && port->dev->reg_state == NETREG_REGISTERED) {
+		if (!port)
+			continue;
+
+		if (port->dev->reg_state == NETREG_REGISTERED) {
 			unregister_netdev(port->dev);
-			airoha_metadata_dst_free(port);
+			phylink_destroy(port->phylink);
 		}
+		airoha_metadata_dst_free(port);
 	}
 	free_netdev(eth->napi_dev);
 	platform_set_drvdata(pdev, NULL);
@@ -3076,6 +3159,7 @@ static void airoha_remove(struct platform_device *pdev)
 
 		airoha_dev_stop(port->dev);
 		unregister_netdev(port->dev);
+		phylink_destroy(port->phylink);
 		airoha_metadata_dst_free(port);
 	}
 	free_netdev(eth->napi_dev);
diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
index eb27a4ff5198..c144c1ece23b 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.h
+++ b/drivers/net/ethernet/airoha/airoha_eth.h
@@ -531,6 +531,9 @@ 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);
-- 
2.51.0

Re: [net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Lorenzo Bianconi]

[-- Attachment #1: Type: text/plain, Size: 2872 bytes --]

[...]
>  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  				 struct device_node *np, int index)
>  {
> @@ -2931,19 +2995,30 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  	port->id = id;
>  	eth->ports[p] = port;
>  
> -	err = airoha_metadata_dst_alloc(port);
> -	if (err)
> -		return err;
> +	return airoha_metadata_dst_alloc(port);
> +}
>  
> -	err = register_netdev(dev);
> -	if (err)
> -		goto free_metadata_dst;
> +static int airoha_register_gdm_ports(struct airoha_eth *eth)
> +{
> +	int i;
>  
> -	return 0;
> +	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
> +		struct airoha_gdm_port *port = eth->ports[i];
> +		int err;
>  
> -free_metadata_dst:
> -	airoha_metadata_dst_free(port);
> -	return err;
> +		if (!port)
> +			continue;
> +
> +		err = airoha_setup_phylink(port->dev);
> +		if (err)
> +			return err;
> +
> +		err = register_netdev(port->dev);
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
>  }
>  
>  static int airoha_probe(struct platform_device *pdev)
> @@ -3034,6 +3109,10 @@ static int airoha_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	err = airoha_register_gdm_ports(eth);

is there any specific reason we need to alloc all netdevs before registering
the given phylink? I guess you can just do it in airoha_alloc_gdm_port(),
right?

Regards,
Lorenzo

> +	if (err)
> +		goto error_napi_stop;
> +
>  	return 0;
>  
>  error_napi_stop:
> @@ -3047,10 +3126,14 @@ static int airoha_probe(struct platform_device *pdev)
>  	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
>  		struct airoha_gdm_port *port = eth->ports[i];
>  
> -		if (port && port->dev->reg_state == NETREG_REGISTERED) {
> +		if (!port)
> +			continue;
> +
> +		if (port->dev->reg_state == NETREG_REGISTERED) {
>  			unregister_netdev(port->dev);
> -			airoha_metadata_dst_free(port);
> +			phylink_destroy(port->phylink);
>  		}
> +		airoha_metadata_dst_free(port);
>  	}
>  	free_netdev(eth->napi_dev);
>  	platform_set_drvdata(pdev, NULL);
> @@ -3076,6 +3159,7 @@ static void airoha_remove(struct platform_device *pdev)
>  
>  		airoha_dev_stop(port->dev);
>  		unregister_netdev(port->dev);
> +		phylink_destroy(port->phylink);
>  		airoha_metadata_dst_free(port);
>  	}
>  	free_netdev(eth->napi_dev);
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
> index eb27a4ff5198..c144c1ece23b 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.h
> +++ b/drivers/net/ethernet/airoha/airoha_eth.h
> @@ -531,6 +531,9 @@ 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);
> -- 
> 2.51.0
> 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

Re: [net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Maxime Chevallier]

Hi Christian,

On 21/10/2025 21:33, Christian Marangi wrote:
> In preparation for support of GDM2+ port, fill in phylink OPs for GDM1
> that is an INTERNAL port for the Embedded Switch.
> 
> Rework the GDM init logic by first preparing the struct with all the
> required info and creating the phylink interface and only after the
> parsing register the related netdev.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
>  drivers/net/ethernet/airoha/airoha_eth.c | 108 ++++++++++++++++++++---
>  drivers/net/ethernet/airoha/airoha_eth.h |   3 +
>  2 files changed, 99 insertions(+), 12 deletions(-)

You also need to select PHYLINK in Kconfig

> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> index ce6d13b10e27..fc237775a998 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.c
> +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> @@ -1613,6 +1613,8 @@ static int airoha_dev_open(struct net_device *dev)
>  	struct airoha_gdm_port *port = netdev_priv(dev);
>  	struct airoha_qdma *qdma = port->qdma;
>  
> +	phylink_start(port->phylink);
> +
>  	netif_tx_start_all_queues(dev);
>  	err = airoha_set_vip_for_gdm_port(port, true);
>  	if (err)
> @@ -1665,6 +1667,8 @@ static int airoha_dev_stop(struct net_device *dev)
>  		}
>  	}
>  
> +	phylink_stop(port->phylink);
> +
>  	return 0;
>  }
>  
> @@ -2813,6 +2817,17 @@ static const struct ethtool_ops airoha_ethtool_ops = {
>  	.get_link		= ethtool_op_get_link,
>  };
>  
> +static struct phylink_pcs *airoha_phylink_mac_select_pcs(struct phylink_config *config,
> +							 phy_interface_t interface)
> +{
> +	return NULL;
> +}
> +
> +static void airoha_mac_config(struct phylink_config *config, unsigned int mode,
> +			      const struct phylink_link_state *state)
> +{
> +}
> +
>  static int airoha_metadata_dst_alloc(struct airoha_gdm_port *port)
>  {
>  	int i;
> @@ -2857,6 +2872,55 @@ 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)
> +{
> +}
> +
> +static void airoha_mac_link_down(struct phylink_config *config, unsigned int mode,
> +				 phy_interface_t interface)
> +{
> +}
> +
> +static const struct phylink_mac_ops airoha_phylink_ops = {
> +	.mac_select_pcs = airoha_phylink_mac_select_pcs,
> +	.mac_config = airoha_mac_config,
> +	.mac_link_up = airoha_mac_link_up,
> +	.mac_link_down = airoha_mac_link_down,
> +};
> +
> +static int airoha_setup_phylink(struct net_device *netdev)
> +{
> +	struct airoha_gdm_port *port = netdev_priv(netdev);
> +	struct device *dev = &netdev->dev;
> +	phy_interface_t phy_mode;
> +	struct phylink *phylink;
> +
> +	phy_mode = device_get_phy_mode(dev);
> +	if (phy_mode < 0) {
> +		dev_err(dev, "incorrect phy-mode\n");
> +		return phy_mode;
> +	}
> +
> +	port->phylink_config.dev = dev;
> +	port->phylink_config.type = PHYLINK_NETDEV;
> +	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> +						MAC_10000FD;
> +
> +	__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> +		  port->phylink_config.supported_interfaces);
> +
> +	phylink = phylink_create(&port->phylink_config, dev_fwnode(dev),
> +				 phy_mode, &airoha_phylink_ops);
> +	if (IS_ERR(phylink))
> +		return PTR_ERR(phylink);
> +
> +	port->phylink = phylink;
> +
> +	return 0;
> +}
> +
>  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  				 struct device_node *np, int index)
>  {
> @@ -2931,19 +2995,30 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  	port->id = id;
>  	eth->ports[p] = port;
>  
> -	err = airoha_metadata_dst_alloc(port);
> -	if (err)
> -		return err;
> +	return airoha_metadata_dst_alloc(port);
> +}
>  
> -	err = register_netdev(dev);
> -	if (err)
> -		goto free_metadata_dst;
> +static int airoha_register_gdm_ports(struct airoha_eth *eth)
> +{
> +	int i;
>  
> -	return 0;
> +	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
> +		struct airoha_gdm_port *port = eth->ports[i];
> +		int err;
>  
> -free_metadata_dst:
> -	airoha_metadata_dst_free(port);
> -	return err;
> +		if (!port)
> +			continue;
> +
> +		err = airoha_setup_phylink(port->dev);
> +		if (err)
> +			return err;
> +
> +		err = register_netdev(port->dev);
> +		if (err)
> +			return err;

The cleanup for that path seems to only be done if

  port->dev->reg_state == NETREG_REGISTERED

So if netdev registration fails here, you'll never destroy
the phylink instance :(

Maxime

Re: [net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Simon Horman]

On Tue, Oct 21, 2025 at 09:33:12PM +0200, Christian Marangi wrote:

...

> +static int airoha_setup_phylink(struct net_device *netdev)
> +{
> +	struct airoha_gdm_port *port = netdev_priv(netdev);
> +	struct device *dev = &netdev->dev;
> +	phy_interface_t phy_mode;

Hi Christian,

phy_interface_t is an enum and thus may in practice be unsigned...

> +	struct phylink *phylink;
> +
> +	phy_mode = device_get_phy_mode(dev);
> +	if (phy_mode < 0) {

... if so, this condition will always be false.

I suspect the correct approach here is to change the type of phy_mode to int.

Flagged by Smatch.

> +		dev_err(dev, "incorrect phy-mode\n");
> +		return phy_mode;
> +	}
> +
> +	port->phylink_config.dev = dev;
> +	port->phylink_config.type = PHYLINK_NETDEV;
> +	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> +						MAC_10000FD;
> +
> +	__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> +		  port->phylink_config.supported_interfaces);
> +
> +	phylink = phylink_create(&port->phylink_config, dev_fwnode(dev),
> +				 phy_mode, &airoha_phylink_ops);
> +	if (IS_ERR(phylink))
> +		return PTR_ERR(phylink);
> +
> +	port->phylink = phylink;
> +
> +	return 0;
> +}
> +
>  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  				 struct device_node *np, int index)
>  {

...

-- 
pw-bot: cr

Re: [net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Christian Marangi]

On Wed, Oct 22, 2025 at 04:45:43PM +0100, Simon Horman wrote:
> On Tue, Oct 21, 2025 at 09:33:12PM +0200, Christian Marangi wrote:
> 
> ...
> 
> > +static int airoha_setup_phylink(struct net_device *netdev)
> > +{
> > +	struct airoha_gdm_port *port = netdev_priv(netdev);
> > +	struct device *dev = &netdev->dev;
> > +	phy_interface_t phy_mode;
> 
> Hi Christian,
> 
> phy_interface_t is an enum and thus may in practice be unsigned...
> 
> > +	struct phylink *phylink;
> > +
> > +	phy_mode = device_get_phy_mode(dev);
> > +	if (phy_mode < 0) {
> 
> ... if so, this condition will always be false.
> 
> I suspect the correct approach here is to change the type of phy_mode to int.
> 
> Flagged by Smatch.
>

Thanks a lot for pointing this out. Also I'm a bit confused of why
device_get_phy_mode changed the args deviated from the of variant that
return int and required an additional arg for the interface...

> > +		dev_err(dev, "incorrect phy-mode\n");
> > +		return phy_mode;
> > +	}
> > +
> > +	port->phylink_config.dev = dev;
> > +	port->phylink_config.type = PHYLINK_NETDEV;
> > +	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> > +						MAC_10000FD;
> > +
> > +	__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> > +		  port->phylink_config.supported_interfaces);
> > +
> > +	phylink = phylink_create(&port->phylink_config, dev_fwnode(dev),
> > +				 phy_mode, &airoha_phylink_ops);
> > +	if (IS_ERR(phylink))
> > +		return PTR_ERR(phylink);
> > +
> > +	port->phylink = phylink;
> > +
> > +	return 0;
> > +}
> > +
> >  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
> >  				 struct device_node *np, int index)
> >  {
> 
> ...
> 
> -- 
> pw-bot: cr

-- 
	Ansuel

Re: [net-next PATCH 2/2] net: airoha: add phylink support for GDM1

[Christian Marangi]

On Wed, Oct 22, 2025 at 09:42:11AM +0200, Maxime Chevallier wrote:
> Hi Christian,
> 
> On 21/10/2025 21:33, Christian Marangi wrote:
> > In preparation for support of GDM2+ port, fill in phylink OPs for GDM1
> > that is an INTERNAL port for the Embedded Switch.
> > 
> > Rework the GDM init logic by first preparing the struct with all the
> > required info and creating the phylink interface and only after the
> > parsing register the related netdev.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> > ---
> >  drivers/net/ethernet/airoha/airoha_eth.c | 108 ++++++++++++++++++++---
> >  drivers/net/ethernet/airoha/airoha_eth.h |   3 +
> >  2 files changed, 99 insertions(+), 12 deletions(-)
> 
> You also need to select PHYLINK in Kconfig
> 
> > 
> > diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> > index ce6d13b10e27..fc237775a998 100644
> > --- a/drivers/net/ethernet/airoha/airoha_eth.c
> > +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> > @@ -1613,6 +1613,8 @@ static int airoha_dev_open(struct net_device *dev)
> >  	struct airoha_gdm_port *port = netdev_priv(dev);
> >  	struct airoha_qdma *qdma = port->qdma;
> >  
> > +	phylink_start(port->phylink);
> > +
> >  	netif_tx_start_all_queues(dev);
> >  	err = airoha_set_vip_for_gdm_port(port, true);
> >  	if (err)
> > @@ -1665,6 +1667,8 @@ static int airoha_dev_stop(struct net_device *dev)
> >  		}
> >  	}
> >  
> > +	phylink_stop(port->phylink);
> > +
> >  	return 0;
> >  }
> >  
> > @@ -2813,6 +2817,17 @@ static const struct ethtool_ops airoha_ethtool_ops = {
> >  	.get_link		= ethtool_op_get_link,
> >  };
> >  
> > +static struct phylink_pcs *airoha_phylink_mac_select_pcs(struct phylink_config *config,
> > +							 phy_interface_t interface)
> > +{
> > +	return NULL;
> > +}
> > +
> > +static void airoha_mac_config(struct phylink_config *config, unsigned int mode,
> > +			      const struct phylink_link_state *state)
> > +{
> > +}
> > +
> >  static int airoha_metadata_dst_alloc(struct airoha_gdm_port *port)
> >  {
> >  	int i;
> > @@ -2857,6 +2872,55 @@ 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)
> > +{
> > +}
> > +
> > +static void airoha_mac_link_down(struct phylink_config *config, unsigned int mode,
> > +				 phy_interface_t interface)
> > +{
> > +}
> > +
> > +static const struct phylink_mac_ops airoha_phylink_ops = {
> > +	.mac_select_pcs = airoha_phylink_mac_select_pcs,
> > +	.mac_config = airoha_mac_config,
> > +	.mac_link_up = airoha_mac_link_up,
> > +	.mac_link_down = airoha_mac_link_down,
> > +};
> > +
> > +static int airoha_setup_phylink(struct net_device *netdev)
> > +{
> > +	struct airoha_gdm_port *port = netdev_priv(netdev);
> > +	struct device *dev = &netdev->dev;
> > +	phy_interface_t phy_mode;
> > +	struct phylink *phylink;
> > +
> > +	phy_mode = device_get_phy_mode(dev);
> > +	if (phy_mode < 0) {
> > +		dev_err(dev, "incorrect phy-mode\n");
> > +		return phy_mode;
> > +	}
> > +
> > +	port->phylink_config.dev = dev;
> > +	port->phylink_config.type = PHYLINK_NETDEV;
> > +	port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> > +						MAC_10000FD;
> > +
> > +	__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> > +		  port->phylink_config.supported_interfaces);
> > +
> > +	phylink = phylink_create(&port->phylink_config, dev_fwnode(dev),
> > +				 phy_mode, &airoha_phylink_ops);
> > +	if (IS_ERR(phylink))
> > +		return PTR_ERR(phylink);
> > +
> > +	port->phylink = phylink;
> > +
> > +	return 0;
> > +}
> > +
> >  static int airoha_alloc_gdm_port(struct airoha_eth *eth,
> >  				 struct device_node *np, int index)
> >  {
> > @@ -2931,19 +2995,30 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
> >  	port->id = id;
> >  	eth->ports[p] = port;
> >  
> > -	err = airoha_metadata_dst_alloc(port);
> > -	if (err)
> > -		return err;
> > +	return airoha_metadata_dst_alloc(port);
> > +}
> >  
> > -	err = register_netdev(dev);
> > -	if (err)
> > -		goto free_metadata_dst;
> > +static int airoha_register_gdm_ports(struct airoha_eth *eth)
> > +{
> > +	int i;
> >  
> > -	return 0;
> > +	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
> > +		struct airoha_gdm_port *port = eth->ports[i];
> > +		int err;
> >  
> > -free_metadata_dst:
> > -	airoha_metadata_dst_free(port);
> > -	return err;
> > +		if (!port)
> > +			continue;
> > +
> > +		err = airoha_setup_phylink(port->dev);
> > +		if (err)
> > +			return err;
> > +
> > +		err = register_netdev(port->dev);
> > +		if (err)
> > +			return err;
> 
> The cleanup for that path seems to only be done if
> 
>   port->dev->reg_state == NETREG_REGISTERED
> 
> So if netdev registration fails here, you'll never destroy
> the phylink instance :(
> 

Oh ok I was with the (wrong) assumption that register_netdev always set
the state to REGISTERED but checking the actual function it's totally
not the case.

Wonder if there is a better method to check it but I guess making the
requested changed from Lorenzo should indirectly handle this BUG.

> 
> 

-- 
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