diff options
| author | Ingo Molnar <mingo@elte.hu> | 2009-03-31 13:53:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-31 13:53:43 +0200 |
| commit | 7bee946358c3cb957d4aa648fc5ab3cad0b232d0 (patch) | |
| tree | 693061ebde2abc35ecc846e5084630d7225aaaff /include/linux/etherdevice.h | |
| parent | d820ac4c2fa881079e6b689d2098adce337558ae (diff) | |
| parent | 15f7176eb1cccec0a332541285ee752b935c1c85 (diff) | |
Merge branch 'linus' into locking-for-linus
Conflicts:
lib/Kconfig.debug
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 */ |