netdev - Re: [PATCH net-next 1/4] of: net: add a helper for loading netdev->dev

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Date:   Tue, 5 Oct 2021 11:15:48 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Frank Rowand <frowand.list@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] of: net: add a helper for loading netdev->dev_addr

On Tue, Oct 5, 2021 at 10:53 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
> of VLANs...") introduced a rbtree for faster Ethernet address look
> up. To maintain netdev->dev_addr in this tree we need to make all
> the writes to it got through appropriate helpers.
>
> There are roughly 40 places where netdev->dev_addr is passed
> as the destination to a of_get_mac_address() call. Add a helper
> which takes a dev pointer instead, so it can call an appropriate
> helper.
>
> Note that of_get_mac_address() already assumes the address is
> 6 bytes long (ETH_ALEN) so use eth_hw_addr_set().
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  drivers/of/of_net.c    | 25 +++++++++++++++++++++++++

Can we move this file to drivers/net/ given it's always merged via the
net tree? It's also the only thing left not part of the driver
subsystems.

>  include/linux/of_net.h |  6 ++++++
>  2 files changed, 31 insertions(+)
>
> diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
> index dbac3a172a11..f1a9bf7578e7 100644
> --- a/drivers/of/of_net.c
> +++ b/drivers/of/of_net.c
> @@ -143,3 +143,28 @@ int of_get_mac_address(struct device_node *np, u8 *addr)
>         return of_get_mac_addr_nvmem(np, addr);
>  }
>  EXPORT_SYMBOL(of_get_mac_address);
> +
> +/**
> + * of_get_ethdev_address()
> + * @np:                Caller's Device Node
> + * @dev:       Pointer to netdevice which address will be updated
> + *
> + * Search the device tree for the best MAC address to use.
> + * If found set @dev->dev_addr to that address.
> + *
> + * See documentation of of_get_mac_address() for more information on how
> + * the best address is determined.
> + *
> + * Return: 0 on success and errno in case of error.
> + */
> +int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
> +{
> +       u8 addr[ETH_ALEN];
> +       int ret;
> +
> +       ret = of_get_mac_address(np, addr);
> +       if (!ret)
> +               eth_hw_addr_set(dev, addr);
> +       return ret;
> +}
> +EXPORT_SYMBOL(of_get_ethdev_address);
> diff --git a/include/linux/of_net.h b/include/linux/of_net.h
> index daef3b0d9270..314b9accd98c 100644
> --- a/include/linux/of_net.h
> +++ b/include/linux/of_net.h
> @@ -14,6 +14,7 @@
>  struct net_device;
>  extern int of_get_phy_mode(struct device_node *np, phy_interface_t *interface);
>  extern int of_get_mac_address(struct device_node *np, u8 *mac);
> +int of_get_ethdev_address(struct device_node *np, struct net_device *dev);
>  extern struct net_device *of_find_net_device_by_node(struct device_node *np);
>  #else
>  static inline int of_get_phy_mode(struct device_node *np,
> @@ -27,6 +28,11 @@ static inline int of_get_mac_address(struct device_node *np, u8 *mac)
>         return -ENODEV;
>  }
>
> +static inline int of_get_ethdev_address(struct device_node *np, struct net_device *dev)
> +{
> +       return -ENODEV;
> +}
> +
>  static inline struct net_device *of_find_net_device_by_node(struct device_node *np)
>  {
>         return NULL;
> --
> 2.31.1
>