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net: Add eth_platform_get_mac_address() helper.

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A repeating pattern in drivers has become to use OF node information
and, if not found, platform specific host information to extract the
ethernet address for a given device.

Currently this is done with a call to of_get_mac_address() and then
some ifdef'd stuff for SPARC.

Consolidate this into a portable routine, and provide the
arch_get_platform_mac_address() weak function hook for all
architectures to implement if they want.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-11-05 11:34:57 -05:00
parent cdba756f58
commit c7f5d10549
3 changed files with 41 additions and 0 deletions
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7
arch/sparc/kernel/idprom.c
View File

@ -9,6 +9,7 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/etherdevice.h>
#include <asm/oplib.h>
#include <asm/idprom.h>
@ -60,6 +61,12 @@ static void __init display_system_type(unsigned char machtype)
{
}
#endif
unsigned char *arch_get_platform_mac_address(void)
{
return idprom->id_ethaddr;
}
/* Calculate the IDPROM checksum (xor of the data bytes). */
static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
{

3
include/linux/etherdevice.h
View File

@ -29,6 +29,9 @@
#include <asm/bitsperlong.h>
#ifdef __KERNEL__
struct device;
int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
unsigned char *arch_get_platform_get_mac_address(void);
u32 eth_get_headlen(void *data, unsigned int max_len);
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
extern const struct header_ops eth_header_ops;

31
net/ethernet/eth.c
View File

@ -52,6 +52,8 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/if_ether.h>
#include <linux/of_net.h>
#include <linux/pci.h>
#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
@ -485,3 +487,32 @@ static int __init eth_offload_init(void)
}
fs_initcall(eth_offload_init);
unsigned char * __weak arch_get_platform_mac_address(void)
{
return NULL;
}
int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
{
const unsigned char *addr;
struct device_node *dp;
if (dev_is_pci(dev))
dp = pci_device_to_OF_node(to_pci_dev(dev));
else
dp = dev->of_node;
addr = NULL;
if (dp)
addr = of_get_mac_address(dp);
if (!addr)
addr = arch_get_platform_mac_address();
if (!addr)
return -ENODEV;
ether_addr_copy(mac_addr, addr);
return 0;
}
EXPORT_SYMBOL(eth_platform_get_mac_address);