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Date: Wed, 8 May 2024 07:43:43 +0200
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From: Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: [PATCH net-next 1/2] net: phy: phy_link_topology: Pass netdevice
 to phy_link_topo helpers
To: Maxime Chevallier <maxime.chevallier@bootlin.com>, davem@davemloft.net
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
 thomas.petazzoni@bootlin.com, Andrew Lunn <andrew@lunn.ch>,
 Jakub Kicinski <kuba@kernel.org>, Eric Dumazet <edumazet@google.com>,
 Paolo Abeni <pabeni@redhat.com>, Russell King <linux@armlinux.org.uk>,
 linux-arm-kernel@lists.infradead.org,
 Christophe Leroy <christophe.leroy@csgroup.eu>,
 Herve Codina <herve.codina@bootlin.com>,
 Florian Fainelli <f.fainelli@gmail.com>,
 Vladimir Oltean <vladimir.oltean@nxp.com>,
 =?UTF-8?Q?K=C3=B6ry_Maincent?= <kory.maincent@bootlin.com>,
 Jesse Brandeburg <jesse.brandeburg@intel.com>, =?UTF-8?Q?Marek_Beh=C3=BAn?=
 <kabel@kernel.org>, Piergiorgio Beruto <piergiorgio.beruto@gmail.com>,
 Oleksij Rempel <o.rempel@pengutronix.de>,
 =?UTF-8?Q?Nicol=C3=B2_Veronese?= <nicveronese@gmail.com>,
 Simon Horman <horms@kernel.org>, mwojtas@chromium.org,
 Nathan Chancellor <nathan@kernel.org>, Antoine Tenart <atenart@kernel.org>
References: <20240507102822.2023826-1-maxime.chevallier@bootlin.com>
 <20240507102822.2023826-2-maxime.chevallier@bootlin.com>
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In-Reply-To: <20240507102822.2023826-2-maxime.chevallier@bootlin.com>
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On 07.05.2024 12:28, Maxime Chevallier wrote:
> The phy link topology's main goal is to better track which PHYs are
> connected to a given netdevice. Make so that the helpers take the
> netdevice as a parameter directly.
> 
The commit message should explain what the issue is that you're fixing,
and how this patch fixes it.

> Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
> Fixes: 6916e461e793 ("net: phy: Introduce ethernet link topology representation")
> Closes: https://lore.kernel.org/netdev/2e11b89d-100f-49e7-9c9a-834cc0b82f97@gmail.com/
> Closes: https://lore.kernel.org/netdev/20240409201553.GA4124869@dev-arch.thelio-3990X/
> ---
>  drivers/net/phy/phy_device.c        | 25 ++++++++-----------------
>  drivers/net/phy/phy_link_topology.c | 13 ++++++++++---
>  include/linux/phy_link_topology.h   | 21 +++++++++++++--------
>  net/ethtool/netlink.c               |  2 +-
>  4 files changed, 32 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 616bd7ba46cb..111434201545 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -277,14 +277,6 @@ static void phy_mdio_device_remove(struct mdio_device *mdiodev)
>  
>  static struct phy_driver genphy_driver;
>  
> -static struct phy_link_topology *phy_get_link_topology(struct phy_device *phydev)
> -{
> -	if (phydev->attached_dev)
> -		return phydev->attached_dev->link_topo;
> -
> -	return NULL;
> -}
> -
>  static LIST_HEAD(phy_fixup_list);
>  static DEFINE_MUTEX(phy_fixup_lock);
>  
> @@ -1389,10 +1381,10 @@ static DEVICE_ATTR_RO(phy_standalone);
>  int phy_sfp_connect_phy(void *upstream, struct phy_device *phy)
>  {
>  	struct phy_device *phydev = upstream;
> -	struct phy_link_topology *topo = phy_get_link_topology(phydev);
> +	struct net_device *dev = phydev->attached_dev;
>  
> -	if (topo)
> -		return phy_link_topo_add_phy(topo, phy, PHY_UPSTREAM_PHY, phydev);
> +	if (dev)
> +		return phy_link_topo_add_phy(dev, phy, PHY_UPSTREAM_PHY, phydev);
>  
>  	return 0;
>  }
> @@ -1411,10 +1403,10 @@ EXPORT_SYMBOL(phy_sfp_connect_phy);
>  void phy_sfp_disconnect_phy(void *upstream, struct phy_device *phy)
>  {
>  	struct phy_device *phydev = upstream;
> -	struct phy_link_topology *topo = phy_get_link_topology(phydev);
> +	struct net_device *dev = phydev->attached_dev;
>  
> -	if (topo)
> -		phy_link_topo_del_phy(topo, phy);
> +	if (dev)
> +		phy_link_topo_del_phy(dev, phy);
>  }
>  EXPORT_SYMBOL(phy_sfp_disconnect_phy);
>  
> @@ -1561,8 +1553,7 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
>  		if (phydev->sfp_bus_attached)
>  			dev->sfp_bus = phydev->sfp_bus;
>  
> -		err = phy_link_topo_add_phy(dev->link_topo, phydev,
> -					    PHY_UPSTREAM_MAC, dev);
> +		err = phy_link_topo_add_phy(dev, phydev, PHY_UPSTREAM_MAC, dev);
>  		if (err)
>  			goto error;
>  	}
> @@ -1992,7 +1983,7 @@ void phy_detach(struct phy_device *phydev)
>  	if (dev) {
>  		phydev->attached_dev->phydev = NULL;
>  		phydev->attached_dev = NULL;
> -		phy_link_topo_del_phy(dev->link_topo, phydev);
> +		phy_link_topo_del_phy(dev, phydev);
>  	}
>  	phydev->phylink = NULL;
>  
> diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
> index 985941c5c558..0e36bd7c15dc 100644
> --- a/drivers/net/phy/phy_link_topology.c
> +++ b/drivers/net/phy/phy_link_topology.c
> @@ -35,10 +35,11 @@ void phy_link_topo_destroy(struct phy_link_topology *topo)
>  	kfree(topo);
>  }
>  
> -int phy_link_topo_add_phy(struct phy_link_topology *topo,
> +int phy_link_topo_add_phy(struct net_device *dev,
>  			  struct phy_device *phy,
>  			  enum phy_upstream upt, void *upstream)
>  {
> +	struct phy_link_topology *topo = dev->link_topo;
>  	struct phy_device_node *pdn;
>  	int ret;
>  
> @@ -90,10 +91,16 @@ int phy_link_topo_add_phy(struct phy_link_topology *topo,
>  }
>  EXPORT_SYMBOL_GPL(phy_link_topo_add_phy);
>  
> -void phy_link_topo_del_phy(struct phy_link_topology *topo,
> +void phy_link_topo_del_phy(struct net_device *dev,
>  			   struct phy_device *phy)
>  {
> -	struct phy_device_node *pdn = xa_erase(&topo->phys, phy->phyindex);
> +	struct phy_link_topology *topo = dev->link_topo;
> +	struct phy_device_node *pdn;
> +
> +	if (!topo)
> +		return;
> +
> +	pdn = xa_erase(&topo->phys, phy->phyindex);
>  
>  	/* We delete the PHY from the topology, however we don't re-set the
>  	 * phy->phyindex field. If the PHY isn't gone, we can re-assign it the
> diff --git a/include/linux/phy_link_topology.h b/include/linux/phy_link_topology.h
> index 6b79feb607e7..166a01710aa2 100644
> --- a/include/linux/phy_link_topology.h
> +++ b/include/linux/phy_link_topology.h
> @@ -12,11 +12,11 @@
>  #define __PHY_LINK_TOPOLOGY_H
>  
>  #include <linux/ethtool.h>
> +#include <linux/netdevice.h>
>  #include <linux/phy_link_topology_core.h>
>  
>  struct xarray;
>  struct phy_device;
> -struct net_device;
>  struct sfp_bus;
>  
>  struct phy_device_node {
> @@ -37,11 +37,16 @@ struct phy_link_topology {
>  	u32 next_phy_index;
>  };
>  
> -static inline struct phy_device *
> -phy_link_topo_get_phy(struct phy_link_topology *topo, u32 phyindex)
> +static inline struct phy_device
> +*phy_link_topo_get_phy(struct net_device *dev, u32 phyindex)
>  {
> -	struct phy_device_node *pdn = xa_load(&topo->phys, phyindex);
> +	struct phy_link_topology *topo = dev->link_topo;
> +	struct phy_device_node *pdn;
>  
> +	if (!topo)
> +		return NULL;
> +
> +	pdn = xa_load(&topo->phys, phyindex);
>  	if (pdn)
>  		return pdn->phy;
>  
> @@ -49,21 +54,21 @@ phy_link_topo_get_phy(struct phy_link_topology *topo, u32 phyindex)
>  }
>  
>  #if IS_REACHABLE(CONFIG_PHYLIB)
> -int phy_link_topo_add_phy(struct phy_link_topology *topo,
> +int phy_link_topo_add_phy(struct net_device *dev,
>  			  struct phy_device *phy,
>  			  enum phy_upstream upt, void *upstream);
>  
> -void phy_link_topo_del_phy(struct phy_link_topology *lt, struct phy_device *phy);
> +void phy_link_topo_del_phy(struct net_device *dev, struct phy_device *phy);
>  
>  #else
> -static inline int phy_link_topo_add_phy(struct phy_link_topology *topo,
> +static inline int phy_link_topo_add_phy(struct net_device *dev,
>  					struct phy_device *phy,
>  					enum phy_upstream upt, void *upstream)
>  {
>  	return 0;
>  }
>  
> -static inline void phy_link_topo_del_phy(struct phy_link_topology *topo,
> +static inline void phy_link_topo_del_phy(struct net_device *dev,
>  					 struct phy_device *phy)
>  {
>  }
> diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
> index 563e94e0cbd8..f5b4adf324bc 100644
> --- a/net/ethtool/netlink.c
> +++ b/net/ethtool/netlink.c
> @@ -170,7 +170,7 @@ int ethnl_parse_header_dev_get(struct ethnl_req_info *req_info,
>  			struct nlattr *phy_id;
>  
>  			phy_id = tb[ETHTOOL_A_HEADER_PHY_INDEX];
> -			phydev = phy_link_topo_get_phy(dev->link_topo,
> +			phydev = phy_link_topo_get_phy(dev,
>  						       nla_get_u32(phy_id));
>  			if (!phydev) {
>  				NL_SET_BAD_ATTR(extack, phy_id);