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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. NET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Ethernet handlers.
7 *
8 * Version: @(#)eth.h 1.0.4 05/13/93
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Relocated to include/linux where it belongs by Alan Cox
14 * <gw4pts@gw4pts.ampr.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 */
22#ifndef _LINUX_ETHERDEVICE_H
23#define _LINUX_ETHERDEVICE_H
24
25#include <linux/if_ether.h>
Arnd Bergmannbcd61272005-06-28 15:58:50 -070026#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/random.h>
Eric Dumazet1f87e232008-11-23 23:24:32 -080028#include <asm/unaligned.h>
Joe Perches0d74c422013-12-05 14:54:38 -080029#include <asm/bitsperlong.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#ifdef __KERNEL__
Joe Perchesf629d202013-09-26 14:48:15 -070032__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070033extern const struct header_ops eth_header_ops;
34
Joe Perchesf629d202013-09-26 14:48:15 -070035int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
36 const void *daddr, const void *saddr, unsigned len);
37int eth_rebuild_header(struct sk_buff *skb);
38int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
39int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
40 __be16 type);
41void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev,
42 const unsigned char *haddr);
43int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
44void eth_commit_mac_addr_change(struct net_device *dev, void *p);
45int eth_mac_addr(struct net_device *dev, void *p);
46int eth_change_mtu(struct net_device *dev, int new_mtu);
47int eth_validate_addr(struct net_device *dev);
Stephen Hemmingerccad6372008-11-19 22:42:31 -080048
Joe Perchesf629d202013-09-26 14:48:15 -070049struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
Tom Herbert36909ea2011-01-09 19:36:31 +000050 unsigned int rxqs);
Peter P Waskiewicz Jrf25f4e42007-07-06 13:36:20 -070051#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
Tom Herbert36909ea2011-01-09 19:36:31 +000052#define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
John Fastabendb3343a22012-09-18 00:01:12 +000054/* Reserved Ethernet Addresses per IEEE 802.1Q */
Ben Hutchings2bc80052012-11-01 09:12:02 +000055static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
56{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
John Fastabendb3343a22012-09-18 00:01:12 +000057
58/**
Ben Hutchings46acc462012-11-01 09:11:11 +000059 * is_link_local_ether_addr - Determine if given Ethernet address is link-local
John Fastabendb3343a22012-09-18 00:01:12 +000060 * @addr: Pointer to a six-byte array containing the Ethernet address
61 *
62 * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per
63 * IEEE 802.1Q 8.6.3 Frame filtering.
Joe Perches2c722fe2013-12-06 15:44:21 -080064 *
65 * Please note: addr must be aligned to u16.
John Fastabendb3343a22012-09-18 00:01:12 +000066 */
Ben Hutchings46acc462012-11-01 09:11:11 +000067static inline bool is_link_local_ether_addr(const u8 *addr)
John Fastabendb3343a22012-09-18 00:01:12 +000068{
Ben Hutchings46acc462012-11-01 09:11:11 +000069 __be16 *a = (__be16 *)addr;
Ben Hutchings2bc80052012-11-01 09:12:02 +000070 static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
John Fastabendb3343a22012-09-18 00:01:12 +000071 static const __be16 m = cpu_to_be16(0xfff0);
72
Joe Perches2c722fe2013-12-06 15:44:21 -080073#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
74 return (((*(const u32 *)addr) ^ (*(const u32 *)b)) |
75 ((a[2] ^ b[2]) & m)) == 0;
76#else
John Fastabendb3343a22012-09-18 00:01:12 +000077 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
Joe Perches2c722fe2013-12-06 15:44:21 -080078#endif
John Fastabendb3343a22012-09-18 00:01:12 +000079}
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/**
Stephen Hemmingerc2da8ac2005-11-01 17:05:09 -080082 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
83 * @addr: Pointer to a six-byte array containing the Ethernet address
84 *
85 * Return true if the address is all zeroes.
Joe Perches2c722fe2013-12-06 15:44:21 -080086 *
87 * Please note: addr must be aligned to u16.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 */
Joe Perchesb44907e2012-05-08 06:44:40 +000089static inline bool is_zero_ether_addr(const u8 *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Joe Perches2c722fe2013-12-06 15:44:21 -080091#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
92 return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0;
93#else
94 return (*(const u16 *)(addr + 0) |
95 *(const u16 *)(addr + 2) |
96 *(const u16 *)(addr + 4)) == 0;
97#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
100/**
Stephen Hemmingerc2da8ac2005-11-01 17:05:09 -0800101 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
Michael Ellerman791651212005-05-29 20:24:30 -0700102 * @addr: Pointer to a six-byte array containing the Ethernet address
103 *
104 * Return true if the address is a multicast address.
Stephen Hemminger88df8ef2006-01-03 15:25:45 -0800105 * By definition the broadcast address is also a multicast address.
Michael Ellerman791651212005-05-29 20:24:30 -0700106 */
Joe Perchesb44907e2012-05-08 06:44:40 +0000107static inline bool is_multicast_ether_addr(const u8 *addr)
Michael Ellerman791651212005-05-29 20:24:30 -0700108{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000109 return 0x01 & addr[0];
Michael Ellerman791651212005-05-29 20:24:30 -0700110}
111
Stephen Hemmingerc2da8ac2005-11-01 17:05:09 -0800112/**
Randy Dunlapbc2cda12008-02-13 15:03:25 -0800113 * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802).
Paolo 'Blaisorblade' Giarrussoe0247152007-05-06 14:51:13 -0700114 * @addr: Pointer to a six-byte array containing the Ethernet address
115 *
116 * Return true if the address is a local address.
117 */
Joe Perchesb44907e2012-05-08 06:44:40 +0000118static inline bool is_local_ether_addr(const u8 *addr)
Paolo 'Blaisorblade' Giarrussoe0247152007-05-06 14:51:13 -0700119{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000120 return 0x02 & addr[0];
Paolo 'Blaisorblade' Giarrussoe0247152007-05-06 14:51:13 -0700121}
122
123/**
Stephen Hemmingerc2da8ac2005-11-01 17:05:09 -0800124 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
125 * @addr: Pointer to a six-byte array containing the Ethernet address
126 *
127 * Return true if the address is the broadcast address.
Joe Perches2c722fe2013-12-06 15:44:21 -0800128 *
129 * Please note: addr must be aligned to u16.
Stephen Hemmingerc2da8ac2005-11-01 17:05:09 -0800130 */
Joe Perchesb44907e2012-05-08 06:44:40 +0000131static inline bool is_broadcast_ether_addr(const u8 *addr)
Jeff Garzik9bd481f2005-06-28 01:46:35 -0400132{
Joe Perches2c722fe2013-12-06 15:44:21 -0800133 return (*(const u16 *)(addr + 0) &
134 *(const u16 *)(addr + 2) &
135 *(const u16 *)(addr + 4)) == 0xffff;
Jeff Garzik9bd481f2005-06-28 01:46:35 -0400136}
137
Michael Ellerman791651212005-05-29 20:24:30 -0700138/**
Tobias Klauser51e7eed72011-01-12 22:14:56 +0000139 * is_unicast_ether_addr - Determine if the Ethernet address is unicast
140 * @addr: Pointer to a six-byte array containing the Ethernet address
141 *
142 * Return true if the address is a unicast address.
143 */
Joe Perchesb44907e2012-05-08 06:44:40 +0000144static inline bool is_unicast_ether_addr(const u8 *addr)
Tobias Klauser51e7eed72011-01-12 22:14:56 +0000145{
146 return !is_multicast_ether_addr(addr);
147}
148
149/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * is_valid_ether_addr - Determine if the given Ethernet address is valid
151 * @addr: Pointer to a six-byte array containing the Ethernet address
152 *
153 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
Michael Ellerman791651212005-05-29 20:24:30 -0700154 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 *
156 * Return true if the address is valid.
Joe Perches2c722fe2013-12-06 15:44:21 -0800157 *
158 * Please note: addr must be aligned to u16.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 */
Joe Perchesb44907e2012-05-08 06:44:40 +0000160static inline bool is_valid_ether_addr(const u8 *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Michael Ellerman791651212005-05-29 20:24:30 -0700162 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
163 * explicitly check for it here. */
164 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
167/**
Joe Perches0a4dd592012-07-12 19:33:05 +0000168 * eth_random_addr - Generate software assigned random Ethernet address
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 * @addr: Pointer to a six-byte array containing the Ethernet address
170 *
171 * Generate a random Ethernet address (MAC) that is not multicast
172 * and has the local assigned bit set.
173 */
Joe Perches0a4dd592012-07-12 19:33:05 +0000174static inline void eth_random_addr(u8 *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Joe Perches0a4dd592012-07-12 19:33:05 +0000176 get_random_bytes(addr, ETH_ALEN);
177 addr[0] &= 0xfe; /* clear multicast bit */
178 addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
Stephen Hemminger360ac8e2005-10-25 15:03:41 -0700180
Joe Perches0a4dd592012-07-12 19:33:05 +0000181#define random_ether_addr(addr) eth_random_addr(addr)
182
Stephen Hemminger360ac8e2005-10-25 15:03:41 -0700183/**
Johannes Bergad7eee92012-07-10 06:18:44 +0000184 * eth_broadcast_addr - Assign broadcast address
185 * @addr: Pointer to a six-byte array containing the Ethernet address
186 *
187 * Assign the broadcast address to the given address array.
188 */
189static inline void eth_broadcast_addr(u8 *addr)
190{
191 memset(addr, 0xff, ETH_ALEN);
192}
193
194/**
Duan Jiong6d57e902012-09-08 16:32:28 +0000195 * eth_zero_addr - Assign zero address
196 * @addr: Pointer to a six-byte array containing the Ethernet address
197 *
198 * Assign the zero address to the given address array.
199 */
200static inline void eth_zero_addr(u8 *addr)
201{
202 memset(addr, 0x00, ETH_ALEN);
203}
204
205/**
Danny Kukawka1a0d6ae2012-02-09 09:48:54 +0000206 * eth_hw_addr_random - Generate software assigned random Ethernet and
207 * set device flag
Stefan Assmannc1f79422010-07-22 02:50:21 +0000208 * @dev: pointer to net_device structure
Stefan Assmannc1f79422010-07-22 02:50:21 +0000209 *
Danny Kukawka1a0d6ae2012-02-09 09:48:54 +0000210 * Generate a random Ethernet address (MAC) to be used by a net device
211 * and set addr_assign_type so the state can be read by sysfs and be
212 * used by userspace.
Stefan Assmannc1f79422010-07-22 02:50:21 +0000213 */
Danny Kukawka1a0d6ae2012-02-09 09:48:54 +0000214static inline void eth_hw_addr_random(struct net_device *dev)
Stefan Assmannc1f79422010-07-22 02:50:21 +0000215{
Jiri Pirkoe41b2d72013-01-01 03:30:15 +0000216 dev->addr_assign_type = NET_ADDR_RANDOM;
Joe Perches0a4dd592012-07-12 19:33:05 +0000217 eth_random_addr(dev->dev_addr);
Stefan Assmannc1f79422010-07-22 02:50:21 +0000218}
219
220/**
Joe Perches286ab722014-01-14 15:18:47 -0800221 * ether_addr_copy - Copy an Ethernet address
222 * @dst: Pointer to a six-byte array Ethernet address destination
223 * @src: Pointer to a six-byte array Ethernet address source
224 *
225 * Please note: dst & src must both be aligned to u16.
226 */
227static inline void ether_addr_copy(u8 *dst, const u8 *src)
228{
229#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
230 *(u32 *)dst = *(const u32 *)src;
231 *(u16 *)(dst + 4) = *(const u16 *)(src + 4);
232#else
233 u16 *a = (u16 *)dst;
234 const u16 *b = (const u16 *)src;
235
236 a[0] = b[0];
237 a[1] = b[1];
238 a[2] = b[2];
239#endif
240}
241
242/**
Bjørn Mork83a093b2013-08-30 18:08:44 +0200243 * eth_hw_addr_inherit - Copy dev_addr from another net_device
244 * @dst: pointer to net_device to copy dev_addr to
245 * @src: pointer to net_device to copy dev_addr from
246 *
247 * Copy the Ethernet address from one net_device to another along with
248 * the address attributes (addr_assign_type).
249 */
250static inline void eth_hw_addr_inherit(struct net_device *dst,
251 struct net_device *src)
252{
253 dst->addr_assign_type = src->addr_assign_type;
Joe Perches286ab722014-01-14 15:18:47 -0800254 ether_addr_copy(dst->dev_addr, src->dev_addr);
Bjørn Mork83a093b2013-08-30 18:08:44 +0200255}
256
257/**
Joe Perchesa599b0f2012-05-08 18:56:45 +0000258 * ether_addr_equal - Compare two Ethernet addresses
259 * @addr1: Pointer to a six-byte array containing the Ethernet address
260 * @addr2: Pointer other six-byte array containing the Ethernet address
261 *
stephen hemminger048b8992012-05-17 05:17:28 +0000262 * Compare two Ethernet addresses, returns true if equal
Joe Perches0d74c422013-12-05 14:54:38 -0800263 *
264 * Please note: addr1 & addr2 must both be aligned to u16.
Joe Perchesa599b0f2012-05-08 18:56:45 +0000265 */
266static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2)
267{
Joe Perches0d74c422013-12-05 14:54:38 -0800268#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
269 u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) |
270 ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4)));
Joe Perchesa599b0f2012-05-08 18:56:45 +0000271
Joe Perches0d74c422013-12-05 14:54:38 -0800272 return fold == 0;
Eric Dumazet1f87e232008-11-23 23:24:32 -0800273#else
Joe Perches0d74c422013-12-05 14:54:38 -0800274 const u16 *a = (const u16 *)addr1;
275 const u16 *b = (const u16 *)addr2;
276
277 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0;
Eric Dumazet1f87e232008-11-23 23:24:32 -0800278#endif
279}
280
281/**
Joe Perchesbaf523c2012-05-09 17:04:03 +0000282 * ether_addr_equal_64bits - Compare two Ethernet addresses
283 * @addr1: Pointer to an array of 8 bytes
284 * @addr2: Pointer to an other array of 8 bytes
285 *
stephen hemminger048b8992012-05-17 05:17:28 +0000286 * Compare two Ethernet addresses, returns true if equal, false otherwise.
Joe Perchesbaf523c2012-05-09 17:04:03 +0000287 *
288 * The function doesn't need any conditional branches and possibly uses
289 * word memory accesses on CPU allowing cheap unaligned memory reads.
stephen hemminger048b8992012-05-17 05:17:28 +0000290 * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 }
Joe Perchesbaf523c2012-05-09 17:04:03 +0000291 *
stephen hemminger048b8992012-05-17 05:17:28 +0000292 * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits.
Joe Perchesbaf523c2012-05-09 17:04:03 +0000293 */
294
295static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
296 const u8 addr2[6+2])
297{
Joe Perches0d74c422013-12-05 14:54:38 -0800298#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
299 u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2);
Joe Perchese550ba12012-05-11 12:21:06 +0000300
Joe Perches0d74c422013-12-05 14:54:38 -0800301#ifdef __BIG_ENDIAN
302 return (fold >> 16) == 0;
303#else
304 return (fold << 16) == 0;
305#endif
Joe Perchese550ba12012-05-11 12:21:06 +0000306#else
307 return ether_addr_equal(addr1, addr2);
308#endif
Joe Perchesbaf523c2012-05-09 17:04:03 +0000309}
310
311/**
Joe Perches73eaef82013-12-06 14:21:01 -0800312 * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses
313 * @addr1: Pointer to a six-byte array containing the Ethernet address
314 * @addr2: Pointer other six-byte array containing the Ethernet address
315 *
316 * Compare two Ethernet addresses, returns true if equal
317 *
318 * Please note: Use only when any Ethernet address may not be u16 aligned.
319 */
320static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2)
321{
322#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
323 return ether_addr_equal(addr1, addr2);
324#else
325 return memcmp(addr1, addr2, ETH_ALEN) == 0;
326#endif
327}
328
329/**
Jiri Pirkof001fde2009-05-05 02:48:28 +0000330 * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
331 * @dev: Pointer to a device structure
332 * @addr: Pointer to a six-byte array containing the Ethernet address
333 *
334 * Compare passed address with all addresses of the device. Return true if the
335 * address if one of the device addresses.
336 *
Joe Perchese550ba12012-05-11 12:21:06 +0000337 * Note that this function calls ether_addr_equal_64bits() so take care of
Jiri Pirkof001fde2009-05-05 02:48:28 +0000338 * the right padding.
339 */
340static inline bool is_etherdev_addr(const struct net_device *dev,
341 const u8 addr[6 + 2])
342{
343 struct netdev_hw_addr *ha;
Joe Perchese550ba12012-05-11 12:21:06 +0000344 bool res = false;
Jiri Pirkof001fde2009-05-05 02:48:28 +0000345
346 rcu_read_lock();
347 for_each_dev_addr(dev, ha) {
Joe Perchese550ba12012-05-11 12:21:06 +0000348 res = ether_addr_equal_64bits(addr, ha->addr);
349 if (res)
Jiri Pirkof001fde2009-05-05 02:48:28 +0000350 break;
351 }
352 rcu_read_unlock();
Joe Perchese550ba12012-05-11 12:21:06 +0000353 return res;
Jiri Pirkof001fde2009-05-05 02:48:28 +0000354}
Michael Ellerman791651212005-05-29 20:24:30 -0700355#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Herbert Xuaa4b9f52009-02-08 18:00:37 +0000357/**
358 * compare_ether_header - Compare two Ethernet headers
359 * @a: Pointer to Ethernet header
360 * @b: Pointer to Ethernet header
361 *
stephen hemminger048b8992012-05-17 05:17:28 +0000362 * Compare two Ethernet headers, returns 0 if equal.
Herbert Xuaa4b9f52009-02-08 18:00:37 +0000363 * This assumes that the network header (i.e., IP header) is 4-byte
364 * aligned OR the platform can handle unaligned access. This is the
365 * case for all packets coming into netif_receive_skb or similar
366 * entry points.
367 */
368
Eric Dumazet40d08022010-08-26 22:03:08 -0700369static inline unsigned long compare_ether_header(const void *a, const void *b)
Herbert Xuaa4b9f52009-02-08 18:00:37 +0000370{
Eric Dumazet40d08022010-08-26 22:03:08 -0700371#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
372 unsigned long fold;
373
374 /*
375 * We want to compare 14 bytes:
376 * [a0 ... a13] ^ [b0 ... b13]
377 * Use two long XOR, ORed together, with an overlap of two bytes.
378 * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
379 * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
380 * This means the [a6 a7] ^ [b6 b7] part is done two times.
381 */
382 fold = *(unsigned long *)a ^ *(unsigned long *)b;
383 fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
384 return fold;
385#else
Herbert Xuaa4b9f52009-02-08 18:00:37 +0000386 u32 *a32 = (u32 *)((u8 *)a + 2);
387 u32 *b32 = (u32 *)((u8 *)b + 2);
388
389 return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
390 (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
Eric Dumazet40d08022010-08-26 22:03:08 -0700391#endif
Herbert Xuaa4b9f52009-02-08 18:00:37 +0000392}
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394#endif /* _LINUX_ETHERDEVICE_H */