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of: net: add a helper for loading netdev->dev_addr

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Commit 406f42fa0d ("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@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-10-06 18:06:55 -07:00 • committed by David S. Miller
parent e330fb1459
commit d466effe28
2 changed files with 31 additions and 0 deletions
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6
include/linux/of_net.h
View file

@ -14,6 +14,7 @@
struct net_device; struct net_device;
extern int of_get_phy_mode(struct device_node *np, phy_interface_t *interface); 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); 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); extern struct net_device *of_find_net_device_by_node(struct device_node *np);
#else #else
static inline int of_get_phy_mode(struct device_node *np, 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; 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) static inline struct net_device *of_find_net_device_by_node(struct device_node *np)
{ {
return NULL; return NULL;

25
net/core/of_net.c
View file

@ -143,3 +143,28 @@ int of_get_mac_address(struct device_node *np, u8 *addr)
return of_get_mac_addr_nvmem(np, addr); return of_get_mac_addr_nvmem(np, addr);
} }
EXPORT_SYMBOL(of_get_mac_address); 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);