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[ETH]: ether address compare

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Expose faster ether compare for use by protocols and other
driver. And change name to be more consistent with other ether
address manipulation routines in same file

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Stephen Hemminger 2005-10-25 15:03:41 -07:00 committed by Arnaldo Carvalho de Melo
parent e83b860539
commit 360ac8e2f1
2 changed files with 18 additions and 15 deletions
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16
include/linux/etherdevice.h
View File

@ -104,6 +104,22 @@ static inline void random_ether_addr(u8 *addr)
addr [0] &= 0xfe; /* clear multicast bit */
addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
}
/**
* compare_ether_addr - Compare two Ethernet addresses
* @addr1: Pointer to a six-byte array containing the Ethernet address
* @addr2 Pointer other six-byte array containing the Ethernet address
*
* Compare two ethernet addresses, returns 0 if equal
*/
static inline unsigned compare_ether_addr(const u8 *_a, const u8 *_b)
{
const u16 *a = (const u16 *) _a;
const u16 *b = (const u16 *) _b;
BUILD_BUG_ON(ETH_ALEN != 6);
return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
}
#endif /* __KERNEL__ */
#endif /* _LINUX_ETHERDEVICE_H */

17
net/ethernet/eth.c
View File

@ -146,19 +146,6 @@ int eth_rebuild_header(struct sk_buff *skb)
return 0;
}
static inline unsigned int compare_eth_addr(const unsigned char *__a, const unsigned char *__b)
{
const unsigned short *dest = (unsigned short *) __a;
const unsigned short *devaddr = (unsigned short *) __b;
unsigned int res;
BUILD_BUG_ON(ETH_ALEN != 6);
res = ((dest[0] ^ devaddr[0]) |
(dest[1] ^ devaddr[1]) |
(dest[2] ^ devaddr[2])) != 0;
return res;
}
/*
* Determine the packet's protocol ID. The rule here is that we
@ -176,7 +163,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
eth = eth_hdr(skb);
if (*eth->h_dest&1) {
if (!compare_eth_addr(eth->h_dest, dev->broadcast))
if (!compare_ether_addr(eth->h_dest, dev->broadcast))
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
@ -191,7 +178,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
*/
else if(1 /*dev->flags&IFF_PROMISC*/) {
if (unlikely(compare_eth_addr(eth->h_dest, dev->dev_addr)))
if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
skb->pkt_type = PACKET_OTHERHOST;
}