diff options
| author |   James Morris <jmorris@namei.org> | 2009-03-28 14:57:13 +1100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-03-28 14:57:13 +1100 |
| commit | bb798169d1bb860b07192cf9c75937fadc8610b4 (patch) | |
| tree | fa67f14406a1e79897e6f29e59fed7c02ec31c30 /include/linux/etherdevice.h | |
| parent | TOMOYO: Fix a typo. (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 (diff) | |
Merge branch 'master' of ssh://master.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next
Diffstat (limited to 'include/linux/etherdevice.h')
| -rw-r--r-- | include/linux/etherdevice.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 1cb0f0b90926..a1f17abba7dc 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -184,4 +184,25 @@ static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2], } #endif /* __KERNEL__ */ +/** + * compare_ether_header - Compare two Ethernet headers + * @a: Pointer to Ethernet header + * @b: Pointer to Ethernet header + * + * Compare two ethernet headers, returns 0 if equal. + * This assumes that the network header (i.e., IP header) is 4-byte + * aligned OR the platform can handle unaligned access. This is the + * case for all packets coming into netif_receive_skb or similar + * entry points. + */ + +static inline int compare_ether_header(const void *a, const void *b) +{ + u32 *a32 = (u32 *)((u8 *)a + 2); + u32 *b32 = (u32 *)((u8 *)b + 2); + + return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | + (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); +} + #endif /* _LINUX_ETHERDEVICE_H */ |