1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
4 | * operating system. NET is implemented using the BSD Socket |
5 | * interface as the means of communication with the user level. |
6 | * |
7 | * Definitions for the Ethernet handlers. |
8 | * |
9 | * Version: @(#)eth.h 1.0.4 05/13/93 |
10 | * |
11 | * Authors: Ross Biro |
12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
13 | * |
14 | * Relocated to include/linux where it belongs by Alan Cox |
15 | * <gw4pts@gw4pts.ampr.org> |
16 | */ |
17 | #ifndef _LINUX_ETHERDEVICE_H |
18 | #define _LINUX_ETHERDEVICE_H |
19 | |
20 | #include <linux/if_ether.h> |
21 | #include <linux/netdevice.h> |
22 | #include <linux/random.h> |
23 | #include <linux/crc32.h> |
24 | #include <asm/unaligned.h> |
25 | #include <asm/bitsperlong.h> |
26 | |
27 | #ifdef __KERNEL__ |
28 | struct device; |
29 | struct fwnode_handle; |
30 | |
31 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr); |
32 | int platform_get_ethdev_address(struct device *dev, struct net_device *netdev); |
33 | unsigned char *arch_get_platform_mac_address(void); |
34 | int nvmem_get_mac_address(struct device *dev, void *addrbuf); |
35 | int device_get_mac_address(struct device *dev, char *addr); |
36 | int device_get_ethdev_address(struct device *dev, struct net_device *netdev); |
37 | int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr); |
38 | |
39 | u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len); |
40 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
41 | extern const struct header_ops ; |
42 | |
43 | int (struct sk_buff *skb, struct net_device *dev, unsigned short type, |
44 | const void *daddr, const void *saddr, unsigned len); |
45 | int (const struct sk_buff *skb, unsigned char *haddr); |
46 | int (const struct neighbour *neigh, struct hh_cache *hh, |
47 | __be16 type); |
48 | void (struct hh_cache *hh, const struct net_device *dev, |
49 | const unsigned char *haddr); |
50 | __be16 (const struct sk_buff *skb); |
51 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p); |
52 | void eth_commit_mac_addr_change(struct net_device *dev, void *p); |
53 | int eth_mac_addr(struct net_device *dev, void *p); |
54 | int eth_validate_addr(struct net_device *dev); |
55 | |
56 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
57 | unsigned int rxqs); |
58 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
59 | #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) |
60 | |
61 | struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, |
62 | unsigned int txqs, |
63 | unsigned int rxqs); |
64 | #define devm_alloc_etherdev(dev, sizeof_priv) devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1) |
65 | |
66 | struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb); |
67 | int eth_gro_complete(struct sk_buff *skb, int nhoff); |
68 | |
69 | /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
70 | static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
71 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
72 | #define eth_stp_addr eth_reserved_addr_base |
73 | |
74 | /** |
75 | * is_link_local_ether_addr - Determine if given Ethernet address is link-local |
76 | * @addr: Pointer to a six-byte array containing the Ethernet address |
77 | * |
78 | * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per |
79 | * IEEE 802.1Q 8.6.3 Frame filtering. |
80 | * |
81 | * Please note: addr must be aligned to u16. |
82 | */ |
83 | static inline bool is_link_local_ether_addr(const u8 *addr) |
84 | { |
85 | __be16 *a = (__be16 *)addr; |
86 | static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
87 | static const __be16 m = cpu_to_be16(0xfff0); |
88 | |
89 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
90 | return (((*(const u32 *)addr) ^ (*(const u32 *)b)) | |
91 | (__force int)((a[2] ^ b[2]) & m)) == 0; |
92 | #else |
93 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; |
94 | #endif |
95 | } |
96 | |
97 | /** |
98 | * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
99 | * @addr: Pointer to a six-byte array containing the Ethernet address |
100 | * |
101 | * Return true if the address is all zeroes. |
102 | * |
103 | * Please note: addr must be aligned to u16. |
104 | */ |
105 | static inline bool is_zero_ether_addr(const u8 *addr) |
106 | { |
107 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
108 | return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0; |
109 | #else |
110 | return (*(const u16 *)(addr + 0) | |
111 | *(const u16 *)(addr + 2) | |
112 | *(const u16 *)(addr + 4)) == 0; |
113 | #endif |
114 | } |
115 | |
116 | /** |
117 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
118 | * @addr: Pointer to a six-byte array containing the Ethernet address |
119 | * |
120 | * Return true if the address is a multicast address. |
121 | * By definition the broadcast address is also a multicast address. |
122 | */ |
123 | static inline bool is_multicast_ether_addr(const u8 *addr) |
124 | { |
125 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
126 | u32 a = *(const u32 *)addr; |
127 | #else |
128 | u16 a = *(const u16 *)addr; |
129 | #endif |
130 | #ifdef __BIG_ENDIAN |
131 | return 0x01 & (a >> ((sizeof(a) * 8) - 8)); |
132 | #else |
133 | return 0x01 & a; |
134 | #endif |
135 | } |
136 | |
137 | static inline bool is_multicast_ether_addr_64bits(const u8 *addr) |
138 | { |
139 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
140 | #ifdef __BIG_ENDIAN |
141 | return 0x01 & ((*(const u64 *)addr) >> 56); |
142 | #else |
143 | return 0x01 & (*(const u64 *)addr); |
144 | #endif |
145 | #else |
146 | return is_multicast_ether_addr(addr); |
147 | #endif |
148 | } |
149 | |
150 | /** |
151 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
152 | * @addr: Pointer to a six-byte array containing the Ethernet address |
153 | * |
154 | * Return true if the address is a local address. |
155 | */ |
156 | static inline bool is_local_ether_addr(const u8 *addr) |
157 | { |
158 | return 0x02 & addr[0]; |
159 | } |
160 | |
161 | /** |
162 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast |
163 | * @addr: Pointer to a six-byte array containing the Ethernet address |
164 | * |
165 | * Return true if the address is the broadcast address. |
166 | * |
167 | * Please note: addr must be aligned to u16. |
168 | */ |
169 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
170 | { |
171 | return (*(const u16 *)(addr + 0) & |
172 | *(const u16 *)(addr + 2) & |
173 | *(const u16 *)(addr + 4)) == 0xffff; |
174 | } |
175 | |
176 | /** |
177 | * is_unicast_ether_addr - Determine if the Ethernet address is unicast |
178 | * @addr: Pointer to a six-byte array containing the Ethernet address |
179 | * |
180 | * Return true if the address is a unicast address. |
181 | */ |
182 | static inline bool is_unicast_ether_addr(const u8 *addr) |
183 | { |
184 | return !is_multicast_ether_addr(addr); |
185 | } |
186 | |
187 | /** |
188 | * is_valid_ether_addr - Determine if the given Ethernet address is valid |
189 | * @addr: Pointer to a six-byte array containing the Ethernet address |
190 | * |
191 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not |
192 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
193 | * |
194 | * Return true if the address is valid. |
195 | * |
196 | * Please note: addr must be aligned to u16. |
197 | */ |
198 | static inline bool is_valid_ether_addr(const u8 *addr) |
199 | { |
200 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
201 | * explicitly check for it here. */ |
202 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); |
203 | } |
204 | |
205 | /** |
206 | * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol |
207 | * @proto: Ethertype/length value to be tested |
208 | * |
209 | * Check that the value from the Ethertype/length field is a valid Ethertype. |
210 | * |
211 | * Return true if the valid is an 802.3 supported Ethertype. |
212 | */ |
213 | static inline bool eth_proto_is_802_3(__be16 proto) |
214 | { |
215 | #ifndef __BIG_ENDIAN |
216 | /* if CPU is little endian mask off bits representing LSB */ |
217 | proto &= htons(0xFF00); |
218 | #endif |
219 | /* cast both to u16 and compare since LSB can be ignored */ |
220 | return (__force u16)proto >= (__force u16)htons(ETH_P_802_3_MIN); |
221 | } |
222 | |
223 | /** |
224 | * eth_random_addr - Generate software assigned random Ethernet address |
225 | * @addr: Pointer to a six-byte array containing the Ethernet address |
226 | * |
227 | * Generate a random Ethernet address (MAC) that is not multicast |
228 | * and has the local assigned bit set. |
229 | */ |
230 | static inline void eth_random_addr(u8 *addr) |
231 | { |
232 | get_random_bytes(buf: addr, ETH_ALEN); |
233 | addr[0] &= 0xfe; /* clear multicast bit */ |
234 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ |
235 | } |
236 | |
237 | /** |
238 | * eth_broadcast_addr - Assign broadcast address |
239 | * @addr: Pointer to a six-byte array containing the Ethernet address |
240 | * |
241 | * Assign the broadcast address to the given address array. |
242 | */ |
243 | static inline void eth_broadcast_addr(u8 *addr) |
244 | { |
245 | memset(addr, 0xff, ETH_ALEN); |
246 | } |
247 | |
248 | /** |
249 | * eth_zero_addr - Assign zero address |
250 | * @addr: Pointer to a six-byte array containing the Ethernet address |
251 | * |
252 | * Assign the zero address to the given address array. |
253 | */ |
254 | static inline void eth_zero_addr(u8 *addr) |
255 | { |
256 | memset(addr, 0x00, ETH_ALEN); |
257 | } |
258 | |
259 | /** |
260 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
261 | * set device flag |
262 | * @dev: pointer to net_device structure |
263 | * |
264 | * Generate a random Ethernet address (MAC) to be used by a net device |
265 | * and set addr_assign_type so the state can be read by sysfs and be |
266 | * used by userspace. |
267 | */ |
268 | static inline void eth_hw_addr_random(struct net_device *dev) |
269 | { |
270 | u8 addr[ETH_ALEN]; |
271 | |
272 | eth_random_addr(addr); |
273 | __dev_addr_set(dev, addr, ETH_ALEN); |
274 | dev->addr_assign_type = NET_ADDR_RANDOM; |
275 | } |
276 | |
277 | /** |
278 | * eth_hw_addr_crc - Calculate CRC from netdev_hw_addr |
279 | * @ha: pointer to hardware address |
280 | * |
281 | * Calculate CRC from a hardware address as basis for filter hashes. |
282 | */ |
283 | static inline u32 eth_hw_addr_crc(struct netdev_hw_addr *ha) |
284 | { |
285 | return ether_crc(ETH_ALEN, ha->addr); |
286 | } |
287 | |
288 | /** |
289 | * ether_addr_copy - Copy an Ethernet address |
290 | * @dst: Pointer to a six-byte array Ethernet address destination |
291 | * @src: Pointer to a six-byte array Ethernet address source |
292 | * |
293 | * Please note: dst & src must both be aligned to u16. |
294 | */ |
295 | static inline void ether_addr_copy(u8 *dst, const u8 *src) |
296 | { |
297 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
298 | *(u32 *)dst = *(const u32 *)src; |
299 | *(u16 *)(dst + 4) = *(const u16 *)(src + 4); |
300 | #else |
301 | u16 *a = (u16 *)dst; |
302 | const u16 *b = (const u16 *)src; |
303 | |
304 | a[0] = b[0]; |
305 | a[1] = b[1]; |
306 | a[2] = b[2]; |
307 | #endif |
308 | } |
309 | |
310 | /** |
311 | * eth_hw_addr_set - Assign Ethernet address to a net_device |
312 | * @dev: pointer to net_device structure |
313 | * @addr: address to assign |
314 | * |
315 | * Assign given address to the net_device, addr_assign_type is not changed. |
316 | */ |
317 | static inline void eth_hw_addr_set(struct net_device *dev, const u8 *addr) |
318 | { |
319 | __dev_addr_set(dev, addr, ETH_ALEN); |
320 | } |
321 | |
322 | /** |
323 | * eth_hw_addr_inherit - Copy dev_addr from another net_device |
324 | * @dst: pointer to net_device to copy dev_addr to |
325 | * @src: pointer to net_device to copy dev_addr from |
326 | * |
327 | * Copy the Ethernet address from one net_device to another along with |
328 | * the address attributes (addr_assign_type). |
329 | */ |
330 | static inline void eth_hw_addr_inherit(struct net_device *dst, |
331 | struct net_device *src) |
332 | { |
333 | dst->addr_assign_type = src->addr_assign_type; |
334 | eth_hw_addr_set(dev: dst, addr: src->dev_addr); |
335 | } |
336 | |
337 | /** |
338 | * ether_addr_equal - Compare two Ethernet addresses |
339 | * @addr1: Pointer to a six-byte array containing the Ethernet address |
340 | * @addr2: Pointer other six-byte array containing the Ethernet address |
341 | * |
342 | * Compare two Ethernet addresses, returns true if equal |
343 | * |
344 | * Please note: addr1 & addr2 must both be aligned to u16. |
345 | */ |
346 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) |
347 | { |
348 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
349 | u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | |
350 | ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); |
351 | |
352 | return fold == 0; |
353 | #else |
354 | const u16 *a = (const u16 *)addr1; |
355 | const u16 *b = (const u16 *)addr2; |
356 | |
357 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0; |
358 | #endif |
359 | } |
360 | |
361 | /** |
362 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
363 | * @addr1: Pointer to an array of 8 bytes |
364 | * @addr2: Pointer to an other array of 8 bytes |
365 | * |
366 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
367 | * |
368 | * The function doesn't need any conditional branches and possibly uses |
369 | * word memory accesses on CPU allowing cheap unaligned memory reads. |
370 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
371 | * |
372 | * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
373 | */ |
374 | |
375 | static inline bool ether_addr_equal_64bits(const u8 *addr1, const u8 *addr2) |
376 | { |
377 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
378 | u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); |
379 | |
380 | #ifdef __BIG_ENDIAN |
381 | return (fold >> 16) == 0; |
382 | #else |
383 | return (fold << 16) == 0; |
384 | #endif |
385 | #else |
386 | return ether_addr_equal(addr1, addr2); |
387 | #endif |
388 | } |
389 | |
390 | /** |
391 | * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses |
392 | * @addr1: Pointer to a six-byte array containing the Ethernet address |
393 | * @addr2: Pointer other six-byte array containing the Ethernet address |
394 | * |
395 | * Compare two Ethernet addresses, returns true if equal |
396 | * |
397 | * Please note: Use only when any Ethernet address may not be u16 aligned. |
398 | */ |
399 | static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) |
400 | { |
401 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
402 | return ether_addr_equal(addr1, addr2); |
403 | #else |
404 | return memcmp(addr1, addr2, ETH_ALEN) == 0; |
405 | #endif |
406 | } |
407 | |
408 | /** |
409 | * ether_addr_equal_masked - Compare two Ethernet addresses with a mask |
410 | * @addr1: Pointer to a six-byte array containing the 1st Ethernet address |
411 | * @addr2: Pointer to a six-byte array containing the 2nd Ethernet address |
412 | * @mask: Pointer to a six-byte array containing the Ethernet address bitmask |
413 | * |
414 | * Compare two Ethernet addresses with a mask, returns true if for every bit |
415 | * set in the bitmask the equivalent bits in the ethernet addresses are equal. |
416 | * Using a mask with all bits set is a slower ether_addr_equal. |
417 | */ |
418 | static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2, |
419 | const u8 *mask) |
420 | { |
421 | int i; |
422 | |
423 | for (i = 0; i < ETH_ALEN; i++) { |
424 | if ((addr1[i] ^ addr2[i]) & mask[i]) |
425 | return false; |
426 | } |
427 | |
428 | return true; |
429 | } |
430 | |
431 | static inline bool ether_addr_is_ipv4_mcast(const u8 *addr) |
432 | { |
433 | u8 base[ETH_ALEN] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; |
434 | u8 mask[ETH_ALEN] = { 0xff, 0xff, 0xff, 0x80, 0x00, 0x00 }; |
435 | |
436 | return ether_addr_equal_masked(addr1: addr, addr2: base, mask); |
437 | } |
438 | |
439 | static inline bool ether_addr_is_ipv6_mcast(const u8 *addr) |
440 | { |
441 | u8 base[ETH_ALEN] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; |
442 | u8 mask[ETH_ALEN] = { 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 }; |
443 | |
444 | return ether_addr_equal_masked(addr1: addr, addr2: base, mask); |
445 | } |
446 | |
447 | static inline bool ether_addr_is_ip_mcast(const u8 *addr) |
448 | { |
449 | return ether_addr_is_ipv4_mcast(addr) || |
450 | ether_addr_is_ipv6_mcast(addr); |
451 | } |
452 | |
453 | /** |
454 | * ether_addr_to_u64 - Convert an Ethernet address into a u64 value. |
455 | * @addr: Pointer to a six-byte array containing the Ethernet address |
456 | * |
457 | * Return a u64 value of the address |
458 | */ |
459 | static inline u64 ether_addr_to_u64(const u8 *addr) |
460 | { |
461 | u64 u = 0; |
462 | int i; |
463 | |
464 | for (i = 0; i < ETH_ALEN; i++) |
465 | u = u << 8 | addr[i]; |
466 | |
467 | return u; |
468 | } |
469 | |
470 | /** |
471 | * u64_to_ether_addr - Convert a u64 to an Ethernet address. |
472 | * @u: u64 to convert to an Ethernet MAC address |
473 | * @addr: Pointer to a six-byte array to contain the Ethernet address |
474 | */ |
475 | static inline void u64_to_ether_addr(u64 u, u8 *addr) |
476 | { |
477 | int i; |
478 | |
479 | for (i = ETH_ALEN - 1; i >= 0; i--) { |
480 | addr[i] = u & 0xff; |
481 | u = u >> 8; |
482 | } |
483 | } |
484 | |
485 | /** |
486 | * eth_addr_dec - Decrement the given MAC address |
487 | * |
488 | * @addr: Pointer to a six-byte array containing Ethernet address to decrement |
489 | */ |
490 | static inline void eth_addr_dec(u8 *addr) |
491 | { |
492 | u64 u = ether_addr_to_u64(addr); |
493 | |
494 | u--; |
495 | u64_to_ether_addr(u, addr); |
496 | } |
497 | |
498 | /** |
499 | * eth_addr_inc() - Increment the given MAC address. |
500 | * @addr: Pointer to a six-byte array containing Ethernet address to increment. |
501 | */ |
502 | static inline void eth_addr_inc(u8 *addr) |
503 | { |
504 | u64 u = ether_addr_to_u64(addr); |
505 | |
506 | u++; |
507 | u64_to_ether_addr(u, addr); |
508 | } |
509 | |
510 | /** |
511 | * eth_addr_add() - Add (or subtract) an offset to/from the given MAC address. |
512 | * |
513 | * @offset: Offset to add. |
514 | * @addr: Pointer to a six-byte array containing Ethernet address to increment. |
515 | */ |
516 | static inline void eth_addr_add(u8 *addr, long offset) |
517 | { |
518 | u64 u = ether_addr_to_u64(addr); |
519 | |
520 | u += offset; |
521 | u64_to_ether_addr(u, addr); |
522 | } |
523 | |
524 | /** |
525 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. |
526 | * @dev: Pointer to a device structure |
527 | * @addr: Pointer to a six-byte array containing the Ethernet address |
528 | * |
529 | * Compare passed address with all addresses of the device. Return true if the |
530 | * address if one of the device addresses. |
531 | * |
532 | * Note that this function calls ether_addr_equal_64bits() so take care of |
533 | * the right padding. |
534 | */ |
535 | static inline bool is_etherdev_addr(const struct net_device *dev, |
536 | const u8 addr[6 + 2]) |
537 | { |
538 | struct netdev_hw_addr *ha; |
539 | bool res = false; |
540 | |
541 | rcu_read_lock(); |
542 | for_each_dev_addr(dev, ha) { |
543 | res = ether_addr_equal_64bits(addr1: addr, addr2: ha->addr); |
544 | if (res) |
545 | break; |
546 | } |
547 | rcu_read_unlock(); |
548 | return res; |
549 | } |
550 | #endif /* __KERNEL__ */ |
551 | |
552 | /** |
553 | * compare_ether_header - Compare two Ethernet headers |
554 | * @a: Pointer to Ethernet header |
555 | * @b: Pointer to Ethernet header |
556 | * |
557 | * Compare two Ethernet headers, returns 0 if equal. |
558 | * This assumes that the network header (i.e., IP header) is 4-byte |
559 | * aligned OR the platform can handle unaligned access. This is the |
560 | * case for all packets coming into netif_receive_skb or similar |
561 | * entry points. |
562 | */ |
563 | |
564 | static inline unsigned long (const void *a, const void *b) |
565 | { |
566 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
567 | unsigned long fold; |
568 | |
569 | /* |
570 | * We want to compare 14 bytes: |
571 | * [a0 ... a13] ^ [b0 ... b13] |
572 | * Use two long XOR, ORed together, with an overlap of two bytes. |
573 | * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | |
574 | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] |
575 | * This means the [a6 a7] ^ [b6 b7] part is done two times. |
576 | */ |
577 | fold = *(unsigned long *)a ^ *(unsigned long *)b; |
578 | fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); |
579 | return fold; |
580 | #else |
581 | u32 *a32 = (u32 *)((u8 *)a + 2); |
582 | u32 *b32 = (u32 *)((u8 *)b + 2); |
583 | |
584 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | |
585 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); |
586 | #endif |
587 | } |
588 | |
589 | /** |
590 | * eth_hw_addr_gen - Generate and assign Ethernet address to a port |
591 | * @dev: pointer to port's net_device structure |
592 | * @base_addr: base Ethernet address |
593 | * @id: offset to add to the base address |
594 | * |
595 | * Generate a MAC address using a base address and an offset and assign it |
596 | * to a net_device. Commonly used by switch drivers which need to compute |
597 | * addresses for all their ports. addr_assign_type is not changed. |
598 | */ |
599 | static inline void eth_hw_addr_gen(struct net_device *dev, const u8 *base_addr, |
600 | unsigned int id) |
601 | { |
602 | u64 u = ether_addr_to_u64(addr: base_addr); |
603 | u8 addr[ETH_ALEN]; |
604 | |
605 | u += id; |
606 | u64_to_ether_addr(u, addr); |
607 | eth_hw_addr_set(dev, addr); |
608 | } |
609 | |
610 | /** |
611 | * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame |
612 | * @skb: Buffer to pad |
613 | * |
614 | * An Ethernet frame should have a minimum size of 60 bytes. This function |
615 | * takes short frames and pads them with zeros up to the 60 byte limit. |
616 | */ |
617 | static inline int eth_skb_pad(struct sk_buff *skb) |
618 | { |
619 | return skb_put_padto(skb, ETH_ZLEN); |
620 | } |
621 | |
622 | #endif /* _LINUX_ETHERDEVICE_H */ |
623 | |