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Date:   Thu, 14 Jul 2022 13:40:53 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, yevhen.orlov@plvision.eu,
        taras.chornyi@plvision.eu, andrew@lunn.ch
Subject: Re: [PATCH V3 net-next] net: marvell: prestera: add phylink support
Message-ID: <YtAO1dcbiNSdOd31@shell.armlinux.org.uk>
References: <20220714105516.14291-1-oleksandr.mazur@plvision.eu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220714105516.14291-1-oleksandr.mazur@plvision.eu>
Sender: Russell King (Oracle) <linux@armlinux.org.uk>
Precedence: bulk

Hi Oleksandr,

A process tip: don't send another version immediately after receiving
feedback from a previous version - it's really not helpful, and it
overloads reviewers with additional burden. Please wait at least a few
days to see if anyone else comments on the changes before sending
another revision of it - or a reviewer replies to your reply (as I
have just done.)

Thanks.


On Thu, Jul 14, 2022 at 01:55:16PM +0300, Oleksandr Mazur wrote:
> For SFP port prestera driver will use kernel
> phylink infrastucture to configure port mode based on
> the module that has beed inserted
> 
> Co-developed-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
> Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
> Co-developed-by: Taras Chornyi <taras.chornyi@plvision.eu>
> Signed-off-by: Taras Chornyi <taras.chornyi@plvision.eu>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
> 
> PATCH V3:
>   - force inband mode for SGMII
>   - fix >80 chars warning of checkpatch where possible (2/5)
>   - structure phylink_mac_change alongside phylink-related if-clause;
> PATCH V2:
>   - fix mistreat of bitfield values as if they were bools.
>   - remove phylink_config ifdefs.
>   - remove obsolete phylink pcs / mac callbacks;
>   - rework mac (/pcs) config to not look for speed / duplex
>     parameters while link is not yet set up.
>   - remove unused functions.
>   - add phylink select cfg to prestera Kconfig.
> ---
>  drivers/net/ethernet/marvell/prestera/Kconfig |   1 +
>  .../net/ethernet/marvell/prestera/prestera.h  |   9 +
>  .../marvell/prestera/prestera_ethtool.c       |  28 +-
>  .../marvell/prestera/prestera_ethtool.h       |   3 -
>  .../ethernet/marvell/prestera/prestera_main.c | 348 ++++++++++++++++--
>  5 files changed, 327 insertions(+), 62 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/Kconfig b/drivers/net/ethernet/marvell/prestera/Kconfig
> index b6f20e2034c6..f2f7663c3d10 100644
> --- a/drivers/net/ethernet/marvell/prestera/Kconfig
> +++ b/drivers/net/ethernet/marvell/prestera/Kconfig
> @@ -8,6 +8,7 @@ config PRESTERA
>  	depends on NET_SWITCHDEV && VLAN_8021Q
>  	depends on BRIDGE || BRIDGE=n
>  	select NET_DEVLINK
> +	select PHYLINK
>  	help
>  	  This driver supports Marvell Prestera Switch ASICs family.
>  
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera.h b/drivers/net/ethernet/marvell/prestera/prestera.h
> index bff9651f0a89..832c27e0c284 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera.h
> +++ b/drivers/net/ethernet/marvell/prestera/prestera.h
> @@ -7,6 +7,7 @@
>  #include <linux/notifier.h>
>  #include <linux/skbuff.h>
>  #include <linux/workqueue.h>
> +#include <linux/phylink.h>
>  #include <net/devlink.h>
>  #include <uapi/linux/if_ether.h>
>  
> @@ -92,6 +93,7 @@ struct prestera_lag {
>  struct prestera_flow_block;
>  
>  struct prestera_port_mac_state {
> +	bool valid;
>  	u32 mode;
>  	u32 speed;
>  	bool oper;
> @@ -151,6 +153,12 @@ struct prestera_port {
>  	struct prestera_port_phy_config cfg_phy;
>  	struct prestera_port_mac_state state_mac;
>  	struct prestera_port_phy_state state_phy;
> +
> +	struct phylink_config phy_config;
> +	struct phylink *phy_link;
> +	struct phylink_pcs phylink_pcs;
> +
> +	rwlock_t state_mac_lock;
>  };
>  
>  struct prestera_device {
> @@ -291,6 +299,7 @@ struct prestera_switch {
>  	u32 mtu_min;
>  	u32 mtu_max;
>  	u8 id;
> +	struct device_node *np;
>  	struct prestera_router *router;
>  	struct prestera_lag *lags;
>  	struct prestera_counter *counter;
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_ethtool.c b/drivers/net/ethernet/marvell/prestera/prestera_ethtool.c
> index 40d5b89573bb..1da7ff889417 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_ethtool.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_ethtool.c
> @@ -521,6 +521,9 @@ prestera_ethtool_get_link_ksettings(struct net_device *dev,
>  	ecmd->base.speed = SPEED_UNKNOWN;
>  	ecmd->base.duplex = DUPLEX_UNKNOWN;
>  
> +	if (port->phy_link)
> +		return phylink_ethtool_ksettings_get(port->phy_link, ecmd);
> +
>  	ecmd->base.autoneg = port->autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE;
>  
>  	if (port->caps.type == PRESTERA_PORT_TYPE_TP) {
> @@ -648,6 +651,9 @@ prestera_ethtool_set_link_ksettings(struct net_device *dev,
>  	u8 adver_fec;
>  	int err;
>  
> +	if (port->phy_link)
> +		return phylink_ethtool_ksettings_set(port->phy_link, ecmd);
> +
>  	err = prestera_port_type_set(ecmd, port);
>  	if (err)
>  		return err;
> @@ -782,28 +788,6 @@ static int prestera_ethtool_nway_reset(struct net_device *dev)
>  	return -EINVAL;
>  }
>  
> -void prestera_ethtool_port_state_changed(struct prestera_port *port,
> -					 struct prestera_port_event *evt)
> -{
> -	struct prestera_port_mac_state *smac = &port->state_mac;
> -
> -	smac->oper = evt->data.mac.oper;
> -
> -	if (smac->oper) {
> -		smac->mode = evt->data.mac.mode;
> -		smac->speed = evt->data.mac.speed;
> -		smac->duplex = evt->data.mac.duplex;
> -		smac->fc = evt->data.mac.fc;
> -		smac->fec = evt->data.mac.fec;
> -	} else {
> -		smac->mode = PRESTERA_MAC_MODE_MAX;
> -		smac->speed = SPEED_UNKNOWN;
> -		smac->duplex = DUPLEX_UNKNOWN;
> -		smac->fc = 0;
> -		smac->fec = 0;
> -	}
> -}
> -
>  const struct ethtool_ops prestera_ethtool_ops = {
>  	.get_drvinfo = prestera_ethtool_get_drvinfo,
>  	.get_link_ksettings = prestera_ethtool_get_link_ksettings,
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_ethtool.h b/drivers/net/ethernet/marvell/prestera/prestera_ethtool.h
> index 9eb18e99dea6..bd5600886bc6 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_ethtool.h
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_ethtool.h
> @@ -11,7 +11,4 @@ struct prestera_port;
>  
>  extern const struct ethtool_ops prestera_ethtool_ops;
>  
> -void prestera_ethtool_port_state_changed(struct prestera_port *port,
> -					 struct prestera_port_event *evt);
> -
>  #endif /* _PRESTERA_ETHTOOL_H_ */
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> index ea5bd5069826..65fded8c8f87 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> @@ -9,6 +9,7 @@
>  #include <linux/of.h>
>  #include <linux/of_net.h>
>  #include <linux/if_vlan.h>
> +#include <linux/phylink.h>
>  
>  #include "prestera.h"
>  #include "prestera_hw.h"
> @@ -142,18 +143,24 @@ static int prestera_port_open(struct net_device *dev)
>  	struct prestera_port_mac_config cfg_mac;
>  	int err = 0;
>  
> -	if (port->caps.transceiver == PRESTERA_PORT_TCVR_SFP) {
> -		err = prestera_port_cfg_mac_read(port, &cfg_mac);
> -		if (!err) {
> -			cfg_mac.admin = true;
> -			err = prestera_port_cfg_mac_write(port, &cfg_mac);
> -		}
> +	if (port->phy_link) {
> +		phylink_start(port->phy_link);
>  	} else {
> -		port->cfg_phy.admin = true;
> -		err = prestera_hw_port_phy_mode_set(port, true, port->autoneg,
> -						    port->cfg_phy.mode,
> -						    port->adver_link_modes,
> -						    port->cfg_phy.mdix);
> +		if (port->caps.transceiver == PRESTERA_PORT_TCVR_SFP) {
> +			err = prestera_port_cfg_mac_read(port, &cfg_mac);
> +			if (!err) {
> +				cfg_mac.admin = true;
> +				err = prestera_port_cfg_mac_write(port,
> +								  &cfg_mac);
> +			}
> +		} else {
> +			port->cfg_phy.admin = true;
> +			err = prestera_hw_port_phy_mode_set(port, true,
> +							    port->autoneg,
> +							    port->cfg_phy.mode,
> +							    port->adver_link_modes,
> +							    port->cfg_phy.mdix);
> +		}
>  	}
>  
>  	netif_start_queue(dev);
> @@ -169,23 +176,255 @@ static int prestera_port_close(struct net_device *dev)
>  
>  	netif_stop_queue(dev);
>  
> -	if (port->caps.transceiver == PRESTERA_PORT_TCVR_SFP) {
> +	if (port->phy_link) {
> +		phylink_stop(port->phy_link);
> +		phylink_disconnect_phy(port->phy_link);
>  		err = prestera_port_cfg_mac_read(port, &cfg_mac);
>  		if (!err) {
>  			cfg_mac.admin = false;
>  			prestera_port_cfg_mac_write(port, &cfg_mac);
>  		}
>  	} else {
> -		port->cfg_phy.admin = false;
> -		err = prestera_hw_port_phy_mode_set(port, false, port->autoneg,
> -						    port->cfg_phy.mode,
> -						    port->adver_link_modes,
> -						    port->cfg_phy.mdix);
> +		if (port->caps.transceiver == PRESTERA_PORT_TCVR_SFP) {
> +			err = prestera_port_cfg_mac_read(port, &cfg_mac);
> +			if (!err) {
> +				cfg_mac.admin = false;
> +				prestera_port_cfg_mac_write(port, &cfg_mac);
> +			}
> +		} else {
> +			port->cfg_phy.admin = false;
> +			err = prestera_hw_port_phy_mode_set(port, false, port->autoneg,
> +							    port->cfg_phy.mode,
> +							    port->adver_link_modes,
> +							    port->cfg_phy.mdix);
> +		}
> +	}
> +
> +	return err;
> +}
> +
> +static void
> +prestera_port_mac_state_cache_read(struct prestera_port *port,
> +				   struct prestera_port_mac_state *state)
> +{
> +	read_lock(&port->state_mac_lock);
> +	*state = port->state_mac;
> +	read_unlock(&port->state_mac_lock);
> +}
> +
> +static void
> +prestera_port_mac_state_cache_write(struct prestera_port *port,
> +				    struct prestera_port_mac_state *state)
> +{
> +	write_lock(&port->state_mac_lock);
> +	port->state_mac = *state;
> +	write_unlock(&port->state_mac_lock);
> +}
> +
> +static struct prestera_port *prestera_pcs_to_port(struct phylink_pcs *pcs)
> +{
> +	return container_of(pcs, struct prestera_port, phylink_pcs);
> +}
> +
> +static void prestera_mac_config(struct phylink_config *config,
> +				unsigned int an_mode,
> +				const struct phylink_link_state *state)
> +{
> +}
> +
> +static void prestera_mac_link_down(struct phylink_config *config,
> +				   unsigned int mode, phy_interface_t interface)
> +{
> +	struct net_device *ndev = to_net_dev(config->dev);
> +	struct prestera_port *port = netdev_priv(ndev);
> +	struct prestera_port_mac_state state_mac;
> +
> +	/* Invalidate. Parameters will update on next link event. */
> +	memset(&state_mac, 0, sizeof(state_mac));
> +	state_mac.valid = false;
> +	prestera_port_mac_state_cache_write(port, &state_mac);
> +}
> +
> +static void prestera_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 struct phylink_pcs *
> +prestera_mac_select_pcs(struct phylink_config *config,
> +			phy_interface_t interface)
> +{
> +	struct net_device *dev = to_net_dev(config->dev);
> +	struct prestera_port *port = netdev_priv(dev);
> +
> +	return &port->phylink_pcs;
> +}
> +
> +static void prestera_pcs_get_state(struct phylink_pcs *pcs,
> +				   struct phylink_link_state *state)
> +{
> +	struct prestera_port *port = container_of(pcs, struct prestera_port,
> +						  phylink_pcs);
> +	struct prestera_port_mac_state smac;
> +
> +	prestera_port_mac_state_cache_read(port, &smac);
> +
> +	if (smac.valid) {
> +		state->link = smac.oper ? 1 : 0;
> +		/* AN is completed, when port is up */
> +		state->an_complete = (smac.oper && port->autoneg) ? 1 : 0;
> +		state->speed = smac.speed;
> +		state->duplex = smac.duplex;
> +	} else {
> +		state->link = 0;
> +		state->an_complete = 0;
> +	}
> +}
> +
> +static int prestera_pcs_config(struct phylink_pcs *pcs,
> +			       unsigned int mode,
> +			       phy_interface_t interface,
> +			       const unsigned long *advertising,
> +			       bool permit_pause_to_mac)
> +{
> +	struct prestera_port *port = port = prestera_pcs_to_port(pcs);
> +	struct prestera_port_mac_config cfg_mac;
> +	int err;
> +
> +	err = prestera_port_cfg_mac_read(port, &cfg_mac);
> +	if (err)
> +		return err;
> +
> +	cfg_mac.admin = true;
> +	cfg_mac.fec = PRESTERA_PORT_FEC_OFF;
> +
> +	switch (interface) {
> +	case PHY_INTERFACE_MODE_10GBASER:
> +		cfg_mac.speed = SPEED_10000;
> +		cfg_mac.inband = 0;
> +		cfg_mac.mode = PRESTERA_MAC_MODE_SR_LR;
> +		break;
> +	case PHY_INTERFACE_MODE_2500BASEX:
> +		cfg_mac.speed = SPEED_2500;
> +		cfg_mac.duplex = DUPLEX_FULL;
> +		cfg_mac.inband = test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +					  advertising);
> +		cfg_mac.mode = PRESTERA_MAC_MODE_SGMII;
> +		break;
> +	case PHY_INTERFACE_MODE_SGMII:
> +		cfg_mac.inband = 1;
> +		cfg_mac.mode = PRESTERA_MAC_MODE_SGMII;
> +		break;
> +	case PHY_INTERFACE_MODE_1000BASEX:
> +	default:
> +		cfg_mac.speed = SPEED_1000;
> +		cfg_mac.duplex = DUPLEX_FULL;
> +		cfg_mac.inband = test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +					  advertising);
> +		cfg_mac.mode = PRESTERA_MAC_MODE_1000BASE_X;
> +		break;
> +	}
> +
> +	err = prestera_port_cfg_mac_write(port, &cfg_mac);
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}
> +
> +static void prestera_pcs_an_restart(struct phylink_pcs *pcs)
> +{
> +}
> +
> +static const struct phylink_mac_ops prestera_mac_ops = {
> +	.validate = phylink_generic_validate,
> +	.mac_select_pcs = prestera_mac_select_pcs,
> +	.mac_config = prestera_mac_config,
> +	.mac_link_down = prestera_mac_link_down,
> +	.mac_link_up = prestera_mac_link_up,
> +};
> +
> +static const struct phylink_pcs_ops prestera_pcs_ops = {
> +	.pcs_get_state = prestera_pcs_get_state,
> +	.pcs_config = prestera_pcs_config,
> +	.pcs_an_restart = prestera_pcs_an_restart,
> +};
> +
> +static int prestera_port_sfp_bind(struct prestera_port *port)
> +{
> +	struct prestera_switch *sw = port->sw;
> +	struct device_node *ports, *node;
> +	struct fwnode_handle *fwnode;
> +	struct phylink *phy_link;
> +	int err;
> +
> +	if (!sw->np)
> +		return 0;
> +
> +	ports = of_find_node_by_name(sw->np, "ports");
> +
> +	for_each_child_of_node(ports, node) {
> +		int num;
> +
> +		err = of_property_read_u32(node, "prestera,port-num", &num);
> +		if (err) {
> +			dev_err(sw->dev->dev,
> +				"device node %pOF has no valid reg property: %d\n",
> +				node, err);
> +			goto out;
> +		}
> +
> +		if (port->fp_id != num)
> +			continue;
> +
> +		port->phylink_pcs.ops = &prestera_pcs_ops;
> +
> +		port->phy_config.dev = &port->dev->dev;
> +		port->phy_config.type = PHYLINK_NETDEV;
> +
> +		fwnode = of_fwnode_handle(node);
> +
> +		__set_bit(PHY_INTERFACE_MODE_10GBASER,
> +			  port->phy_config.supported_interfaces);
> +		__set_bit(PHY_INTERFACE_MODE_2500BASEX,
> +			  port->phy_config.supported_interfaces);
> +		__set_bit(PHY_INTERFACE_MODE_SGMII,
> +			  port->phy_config.supported_interfaces);
> +		__set_bit(PHY_INTERFACE_MODE_1000BASEX,
> +			  port->phy_config.supported_interfaces);
> +
> +		port->phy_config.mac_capabilities =
> +			MAC_1000 | MAC_2500FD | MAC_10000FD;
> +
> +		phy_link = phylink_create(&port->phy_config, fwnode,
> +					  PHY_INTERFACE_MODE_INTERNAL,
> +					  &prestera_mac_ops);
> +		if (IS_ERR(phy_link)) {
> +			netdev_err(port->dev, "failed to create phylink\n");
> +			err = PTR_ERR(phy_link);
> +			goto out;
> +		}
> +
> +		port->phy_link = phy_link;
> +		break;
>  	}
>  
> +out:
> +	of_node_put(ports);
>  	return err;
>  }
>  
> +static int prestera_port_sfp_unbind(struct prestera_port *port)
> +{
> +	if (port->phy_link)
> +		phylink_destroy(port->phy_link);
> +
> +	return 0;
> +}
> +
>  static netdev_tx_t prestera_port_xmit(struct sk_buff *skb,
>  				      struct net_device *dev)
>  {
> @@ -380,8 +619,10 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
>  	dev->features |= NETIF_F_NETNS_LOCAL | NETIF_F_HW_TC;
>  	dev->netdev_ops = &prestera_netdev_ops;
>  	dev->ethtool_ops = &prestera_ethtool_ops;
> +	SET_NETDEV_DEV(dev, sw->dev->dev);
>  
> -	netif_carrier_off(dev);
> +	if (port->caps.transceiver != PRESTERA_PORT_TCVR_SFP)
> +		netif_carrier_off(dev);
>  
>  	dev->mtu = min_t(unsigned int, sw->mtu_max, PRESTERA_MTU_DEFAULT);
>  	dev->min_mtu = sw->mtu_min;
> @@ -432,7 +673,7 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
>  		cfg_mac.admin = false;
>  		cfg_mac.mode = PRESTERA_MAC_MODE_MAX;
>  	}
> -	cfg_mac.inband = false;
> +	cfg_mac.inband = 0;
>  	cfg_mac.speed = 0;
>  	cfg_mac.duplex = DUPLEX_UNKNOWN;
>  	cfg_mac.fec = PRESTERA_PORT_FEC_OFF;
> @@ -474,8 +715,13 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
>  
>  	prestera_devlink_port_set(port);
>  
> +	err = prestera_port_sfp_bind(port);
> +	if (err)
> +		goto err_sfp_bind;
> +
>  	return 0;
>  
> +err_sfp_bind:
>  err_register_netdev:
>  	prestera_port_list_del(port);
>  err_port_init:
> @@ -521,8 +767,10 @@ static int prestera_create_ports(struct prestera_switch *sw)
>  	return 0;
>  
>  err_port_create:
> -	list_for_each_entry_safe(port, tmp, &sw->port_list, list)
> +	list_for_each_entry_safe(port, tmp, &sw->port_list, list) {
> +		prestera_port_sfp_unbind(port);
>  		prestera_port_destroy(port);
> +	}
>  
>  	return err;
>  }
> @@ -530,25 +778,47 @@ static int prestera_create_ports(struct prestera_switch *sw)
>  static void prestera_port_handle_event(struct prestera_switch *sw,
>  				       struct prestera_event *evt, void *arg)
>  {
> +	struct prestera_port_mac_state smac;
> +	struct prestera_port_event *pevt;
>  	struct delayed_work *caching_dw;
>  	struct prestera_port *port;
>  
> -	port = prestera_find_port(sw, evt->port_evt.port_id);
> -	if (!port || !port->dev)
> -		return;
> -
> -	caching_dw = &port->cached_hw_stats.caching_dw;
> -
> -	prestera_ethtool_port_state_changed(port, &evt->port_evt);
> -
>  	if (evt->id == PRESTERA_PORT_EVENT_MAC_STATE_CHANGED) {
> +		pevt = &evt->port_evt;
> +		port = prestera_find_port(sw, pevt->port_id);
> +		if (!port || !port->dev)
> +			return;
> +
> +		caching_dw = &port->cached_hw_stats.caching_dw;
> +
> +		if (port->phy_link) {
> +			memset(&smac, 0, sizeof(smac));
> +			smac.valid = true;
> +			smac.oper = pevt->data.mac.oper;
> +			if (smac.oper) {
> +				smac.mode = pevt->data.mac.mode;
> +				smac.speed = pevt->data.mac.speed;
> +				smac.duplex = pevt->data.mac.duplex;
> +				smac.fc = pevt->data.mac.fc;
> +				smac.fec = pevt->data.mac.fec;
> +				phylink_mac_change(port->phy_link, true);
> +			} else {
> +				phylink_mac_change(port->phy_link, false);
> +			}
> +			prestera_port_mac_state_cache_write(port, &smac);
> +		}
> +
>  		if (port->state_mac.oper) {
> -			netif_carrier_on(port->dev);
> +			if (!port->phy_link)
> +				netif_carrier_on(port->dev);
> +
>  			if (!delayed_work_pending(caching_dw))
>  				queue_delayed_work(prestera_wq, caching_dw, 0);
>  		} else if (netif_running(port->dev) &&
>  			   netif_carrier_ok(port->dev)) {
> -			netif_carrier_off(port->dev);
> +			if (!port->phy_link)
> +				netif_carrier_off(port->dev);
> +
>  			if (delayed_work_pending(caching_dw))
>  				cancel_delayed_work(caching_dw);
>  		}
> @@ -571,19 +841,20 @@ static void prestera_event_handlers_unregister(struct prestera_switch *sw)
>  static int prestera_switch_set_base_mac_addr(struct prestera_switch *sw)
>  {
>  	struct device_node *base_mac_np;
> -	struct device_node *np;
>  	int ret;
>  
> -	np = of_find_compatible_node(NULL, NULL, "marvell,prestera");
> -	base_mac_np = of_parse_phandle(np, "base-mac-provider", 0);
> +	if (sw->np) {
> +		base_mac_np = of_parse_phandle(sw->np, "base-mac-provider", 0);
> +		if (base_mac_np) {
> +			ret = of_get_mac_address(base_mac_np, sw->base_mac);
> +			of_node_put(base_mac_np);
> +		}
> +	}
>  
> -	ret = of_get_mac_address(base_mac_np, sw->base_mac);
> -	if (ret) {
> +	if (!is_valid_ether_addr(sw->base_mac) || ret) {
>  		eth_random_addr(sw->base_mac);
>  		dev_info(prestera_dev(sw), "using random base mac address\n");
>  	}
> -	of_node_put(base_mac_np);
> -	of_node_put(np);
>  
>  	return prestera_hw_switch_mac_set(sw, sw->base_mac);
>  }
> @@ -1083,6 +1354,8 @@ static int prestera_switch_init(struct prestera_switch *sw)
>  {
>  	int err;
>  
> +	sw->np = of_find_compatible_node(NULL, NULL, "marvell,prestera");
> +
>  	err = prestera_hw_switch_init(sw);
>  	if (err) {
>  		dev_err(prestera_dev(sw), "Failed to init Switch device\n");
> @@ -1183,6 +1456,7 @@ static void prestera_switch_fini(struct prestera_switch *sw)
>  	prestera_router_fini(sw);
>  	prestera_netdev_event_handler_unregister(sw);
>  	prestera_hw_switch_fini(sw);
> +	of_node_put(sw->np);
>  }
>  
>  int prestera_device_register(struct prestera_device *dev)
> -- 
> 2.17.1
> 
> 

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