xref: /openbmc/linux/net/ethtool/bitset.c (revision 32ced09d)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <linux/ethtool_netlink.h>
4 #include <linux/bitmap.h>
5 #include "netlink.h"
6 #include "bitset.h"
7 
8 /* Some bitmaps are internally represented as an array of unsigned long, some
9  * as an array of u32 (some even as single u32 for now). To avoid the need of
10  * wrappers on caller side, we provide two set of functions: those with "32"
11  * suffix in their names expect u32 based bitmaps, those without it expect
12  * unsigned long bitmaps.
13  */
14 
15 static u32 ethnl_lower_bits(unsigned int n)
16 {
17 	return ~(u32)0 >> (32 - n % 32);
18 }
19 
20 static u32 ethnl_upper_bits(unsigned int n)
21 {
22 	return ~(u32)0 << (n % 32);
23 }
24 
25 /**
26  * ethnl_bitmap32_clear() - Clear u32 based bitmap
27  * @dst:   bitmap to clear
28  * @start: beginning of the interval
29  * @end:   end of the interval
30  * @mod:   set if bitmap was modified
31  *
32  * Clear @nbits bits of a bitmap with indices @start <= i < @end
33  */
34 static void ethnl_bitmap32_clear(u32 *dst, unsigned int start, unsigned int end,
35 				 bool *mod)
36 {
37 	unsigned int start_word = start / 32;
38 	unsigned int end_word = end / 32;
39 	unsigned int i;
40 	u32 mask;
41 
42 	if (end <= start)
43 		return;
44 
45 	if (start % 32) {
46 		mask = ethnl_upper_bits(start);
47 		if (end_word == start_word) {
48 			mask &= ethnl_lower_bits(end);
49 			if (dst[start_word] & mask) {
50 				dst[start_word] &= ~mask;
51 				*mod = true;
52 			}
53 			return;
54 		}
55 		if (dst[start_word] & mask) {
56 			dst[start_word] &= ~mask;
57 			*mod = true;
58 		}
59 		start_word++;
60 	}
61 
62 	for (i = start_word; i < end_word; i++) {
63 		if (dst[i]) {
64 			dst[i] = 0;
65 			*mod = true;
66 		}
67 	}
68 	if (end % 32) {
69 		mask = ethnl_lower_bits(end);
70 		if (dst[end_word] & mask) {
71 			dst[end_word] &= ~mask;
72 			*mod = true;
73 		}
74 	}
75 }
76 
77 /**
78  * ethnl_bitmap32_not_zero() - Check if any bit is set in an interval
79  * @map:   bitmap to test
80  * @start: beginning of the interval
81  * @end:   end of the interval
82  *
83  * Return: true if there is non-zero bit with  index @start <= i < @end,
84  *         false if the whole interval is zero
85  */
86 static bool ethnl_bitmap32_not_zero(const u32 *map, unsigned int start,
87 				    unsigned int end)
88 {
89 	unsigned int start_word = start / 32;
90 	unsigned int end_word = end / 32;
91 	u32 mask;
92 
93 	if (end <= start)
94 		return true;
95 
96 	if (start % 32) {
97 		mask = ethnl_upper_bits(start);
98 		if (end_word == start_word) {
99 			mask &= ethnl_lower_bits(end);
100 			return map[start_word] & mask;
101 		}
102 		if (map[start_word] & mask)
103 			return true;
104 		start_word++;
105 	}
106 
107 	if (!memchr_inv(map + start_word, '\0',
108 			(end_word - start_word) * sizeof(u32)))
109 		return true;
110 	if (end % 32 == 0)
111 		return true;
112 	return map[end_word] & ethnl_lower_bits(end);
113 }
114 
115 /**
116  * ethnl_bitmap32_update() - Modify u32 based bitmap according to value/mask
117  *			     pair
118  * @dst:   bitmap to update
119  * @nbits: bit size of the bitmap
120  * @value: values to set
121  * @mask:  mask of bits to set
122  * @mod:   set to true if bitmap is modified, preserve if not
123  *
124  * Set bits in @dst bitmap which are set in @mask to values from @value, leave
125  * the rest untouched. If destination bitmap was modified, set @mod to true,
126  * leave as it is if not.
127  */
128 static void ethnl_bitmap32_update(u32 *dst, unsigned int nbits,
129 				  const u32 *value, const u32 *mask, bool *mod)
130 {
131 	while (nbits > 0) {
132 		u32 real_mask = mask ? *mask : ~(u32)0;
133 		u32 new_value;
134 
135 		if (nbits < 32)
136 			real_mask &= ethnl_lower_bits(nbits);
137 		new_value = (*dst & ~real_mask) | (*value & real_mask);
138 		if (new_value != *dst) {
139 			*dst = new_value;
140 			*mod = true;
141 		}
142 
143 		if (nbits <= 32)
144 			break;
145 		dst++;
146 		nbits -= 32;
147 		value++;
148 		if (mask)
149 			mask++;
150 	}
151 }
152 
153 static bool ethnl_bitmap32_test_bit(const u32 *map, unsigned int index)
154 {
155 	return map[index / 32] & (1U << (index % 32));
156 }
157 
158 /**
159  * ethnl_bitset32_size() - Calculate size of bitset nested attribute
160  * @val:     value bitmap (u32 based)
161  * @mask:    mask bitmap (u32 based, optional)
162  * @nbits:   bit length of the bitset
163  * @names:   array of bit names (optional)
164  * @compact: assume compact format for output
165  *
166  * Estimate length of netlink attribute composed by a later call to
167  * ethnl_put_bitset32() call with the same arguments.
168  *
169  * Return: negative error code or attribute length estimate
170  */
171 int ethnl_bitset32_size(const u32 *val, const u32 *mask, unsigned int nbits,
172 			ethnl_string_array_t names, bool compact)
173 {
174 	unsigned int len = 0;
175 
176 	/* list flag */
177 	if (!mask)
178 		len += nla_total_size(sizeof(u32));
179 	/* size */
180 	len += nla_total_size(sizeof(u32));
181 
182 	if (compact) {
183 		unsigned int nwords = DIV_ROUND_UP(nbits, 32);
184 
185 		/* value, mask */
186 		len += (mask ? 2 : 1) * nla_total_size(nwords * sizeof(u32));
187 	} else {
188 		unsigned int bits_len = 0;
189 		unsigned int bit_len, i;
190 
191 		for (i = 0; i < nbits; i++) {
192 			const char *name = names ? names[i] : NULL;
193 
194 			if (!ethnl_bitmap32_test_bit(mask ?: val, i))
195 				continue;
196 			/* index */
197 			bit_len = nla_total_size(sizeof(u32));
198 			/* name */
199 			if (name)
200 				bit_len += ethnl_strz_size(name);
201 			/* value */
202 			if (mask && ethnl_bitmap32_test_bit(val, i))
203 				bit_len += nla_total_size(0);
204 
205 			/* bit nest */
206 			bits_len += nla_total_size(bit_len);
207 		}
208 		/* bits nest */
209 		len += nla_total_size(bits_len);
210 	}
211 
212 	/* outermost nest */
213 	return nla_total_size(len);
214 }
215 
216 /**
217  * ethnl_put_bitset32() - Put a bitset nest into a message
218  * @skb:      skb with the message
219  * @attrtype: attribute type for the bitset nest
220  * @val:      value bitmap (u32 based)
221  * @mask:     mask bitmap (u32 based, optional)
222  * @nbits:    bit length of the bitset
223  * @names:    array of bit names (optional)
224  * @compact:  use compact format for the output
225  *
226  * Compose a nested attribute representing a bitset. If @mask is null, simple
227  * bitmap (bit list) is created, if @mask is provided, represent a value/mask
228  * pair. Bit names are only used in verbose mode and when provided by calller.
229  *
230  * Return: 0 on success, negative error value on error
231  */
232 int ethnl_put_bitset32(struct sk_buff *skb, int attrtype, const u32 *val,
233 		       const u32 *mask, unsigned int nbits,
234 		       ethnl_string_array_t names, bool compact)
235 {
236 	struct nlattr *nest;
237 	struct nlattr *attr;
238 
239 	nest = nla_nest_start(skb, attrtype);
240 	if (!nest)
241 		return -EMSGSIZE;
242 
243 	if (!mask && nla_put_flag(skb, ETHTOOL_A_BITSET_NOMASK))
244 		goto nla_put_failure;
245 	if (nla_put_u32(skb, ETHTOOL_A_BITSET_SIZE, nbits))
246 		goto nla_put_failure;
247 	if (compact) {
248 		unsigned int nwords = DIV_ROUND_UP(nbits, 32);
249 		unsigned int nbytes = nwords * sizeof(u32);
250 		u32 *dst;
251 
252 		attr = nla_reserve(skb, ETHTOOL_A_BITSET_VALUE, nbytes);
253 		if (!attr)
254 			goto nla_put_failure;
255 		dst = nla_data(attr);
256 		memcpy(dst, val, nbytes);
257 		if (nbits % 32)
258 			dst[nwords - 1] &= ethnl_lower_bits(nbits);
259 
260 		if (mask) {
261 			attr = nla_reserve(skb, ETHTOOL_A_BITSET_MASK, nbytes);
262 			if (!attr)
263 				goto nla_put_failure;
264 			dst = nla_data(attr);
265 			memcpy(dst, mask, nbytes);
266 			if (nbits % 32)
267 				dst[nwords - 1] &= ethnl_lower_bits(nbits);
268 		}
269 	} else {
270 		struct nlattr *bits;
271 		unsigned int i;
272 
273 		bits = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS);
274 		if (!bits)
275 			goto nla_put_failure;
276 		for (i = 0; i < nbits; i++) {
277 			const char *name = names ? names[i] : NULL;
278 
279 			if (!ethnl_bitmap32_test_bit(mask ?: val, i))
280 				continue;
281 			attr = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS_BIT);
282 			if (!attr)
283 				goto nla_put_failure;
284 			if (nla_put_u32(skb, ETHTOOL_A_BITSET_BIT_INDEX, i))
285 				goto nla_put_failure;
286 			if (name &&
287 			    ethnl_put_strz(skb, ETHTOOL_A_BITSET_BIT_NAME, name))
288 				goto nla_put_failure;
289 			if (mask && ethnl_bitmap32_test_bit(val, i) &&
290 			    nla_put_flag(skb, ETHTOOL_A_BITSET_BIT_VALUE))
291 				goto nla_put_failure;
292 			nla_nest_end(skb, attr);
293 		}
294 		nla_nest_end(skb, bits);
295 	}
296 
297 	nla_nest_end(skb, nest);
298 	return 0;
299 
300 nla_put_failure:
301 	nla_nest_cancel(skb, nest);
302 	return -EMSGSIZE;
303 }
304 
305 static const struct nla_policy bitset_policy[ETHTOOL_A_BITSET_MAX + 1] = {
306 	[ETHTOOL_A_BITSET_UNSPEC]	= { .type = NLA_REJECT },
307 	[ETHTOOL_A_BITSET_NOMASK]	= { .type = NLA_FLAG },
308 	[ETHTOOL_A_BITSET_SIZE]		= { .type = NLA_U32 },
309 	[ETHTOOL_A_BITSET_BITS]		= { .type = NLA_NESTED },
310 	[ETHTOOL_A_BITSET_VALUE]	= { .type = NLA_BINARY },
311 	[ETHTOOL_A_BITSET_MASK]		= { .type = NLA_BINARY },
312 };
313 
314 static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
315 	[ETHTOOL_A_BITSET_BIT_UNSPEC]	= { .type = NLA_REJECT },
316 	[ETHTOOL_A_BITSET_BIT_INDEX]	= { .type = NLA_U32 },
317 	[ETHTOOL_A_BITSET_BIT_NAME]	= { .type = NLA_NUL_STRING },
318 	[ETHTOOL_A_BITSET_BIT_VALUE]	= { .type = NLA_FLAG },
319 };
320 
321 /**
322  * ethnl_bitset_is_compact() - check if bitset attribute represents a compact
323  *			       bitset
324  * @bitset:  nested attribute representing a bitset
325  * @compact: pointer for return value
326  *
327  * Return: 0 on success, negative error code on failure
328  */
329 int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
330 {
331 	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
332 	int ret;
333 
334 	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, bitset,
335 			       bitset_policy, NULL);
336 	if (ret < 0)
337 		return ret;
338 
339 	if (tb[ETHTOOL_A_BITSET_BITS]) {
340 		if (tb[ETHTOOL_A_BITSET_VALUE] || tb[ETHTOOL_A_BITSET_MASK])
341 			return -EINVAL;
342 		*compact = false;
343 		return 0;
344 	}
345 	if (!tb[ETHTOOL_A_BITSET_SIZE] || !tb[ETHTOOL_A_BITSET_VALUE])
346 		return -EINVAL;
347 
348 	*compact = true;
349 	return 0;
350 }
351 
352 /**
353  * ethnl_name_to_idx() - look up string index for a name
354  * @names:   array of ETH_GSTRING_LEN sized strings
355  * @n_names: number of strings in the array
356  * @name:    name to look up
357  *
358  * Return: index of the string if found, -ENOENT if not found
359  */
360 static int ethnl_name_to_idx(ethnl_string_array_t names, unsigned int n_names,
361 			     const char *name)
362 {
363 	unsigned int i;
364 
365 	if (!names)
366 		return -ENOENT;
367 
368 	for (i = 0; i < n_names; i++) {
369 		/* names[i] may not be null terminated */
370 		if (!strncmp(names[i], name, ETH_GSTRING_LEN) &&
371 		    strlen(name) <= ETH_GSTRING_LEN)
372 			return i;
373 	}
374 
375 	return -ENOENT;
376 }
377 
378 static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
379 			   const struct nlattr *bit_attr, bool no_mask,
380 			   ethnl_string_array_t names,
381 			   struct netlink_ext_ack *extack)
382 {
383 	struct nlattr *tb[ETHTOOL_A_BITSET_BIT_MAX + 1];
384 	int ret, idx;
385 
386 	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_BIT_MAX, bit_attr,
387 			       bit_policy, extack);
388 	if (ret < 0)
389 		return ret;
390 
391 	if (tb[ETHTOOL_A_BITSET_BIT_INDEX]) {
392 		const char *name;
393 
394 		idx = nla_get_u32(tb[ETHTOOL_A_BITSET_BIT_INDEX]);
395 		if (idx >= nbits) {
396 			NL_SET_ERR_MSG_ATTR(extack,
397 					    tb[ETHTOOL_A_BITSET_BIT_INDEX],
398 					    "bit index too high");
399 			return -EOPNOTSUPP;
400 		}
401 		name = names ? names[idx] : NULL;
402 		if (tb[ETHTOOL_A_BITSET_BIT_NAME] && name &&
403 		    strncmp(nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]), name,
404 			    nla_len(tb[ETHTOOL_A_BITSET_BIT_NAME]))) {
405 			NL_SET_ERR_MSG_ATTR(extack, bit_attr,
406 					    "bit index and name mismatch");
407 			return -EINVAL;
408 		}
409 	} else if (tb[ETHTOOL_A_BITSET_BIT_NAME]) {
410 		idx = ethnl_name_to_idx(names, nbits,
411 					nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]));
412 		if (idx < 0) {
413 			NL_SET_ERR_MSG_ATTR(extack,
414 					    tb[ETHTOOL_A_BITSET_BIT_NAME],
415 					    "bit name not found");
416 			return -EOPNOTSUPP;
417 		}
418 	} else {
419 		NL_SET_ERR_MSG_ATTR(extack, bit_attr,
420 				    "neither bit index nor name specified");
421 		return -EINVAL;
422 	}
423 
424 	*index = idx;
425 	*val = no_mask || tb[ETHTOOL_A_BITSET_BIT_VALUE];
426 	return 0;
427 }
428 
429 static int
430 ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
431 			      const struct nlattr *attr, struct nlattr **tb,
432 			      ethnl_string_array_t names,
433 			      struct netlink_ext_ack *extack, bool *mod)
434 {
435 	struct nlattr *bit_attr;
436 	bool no_mask;
437 	int rem;
438 	int ret;
439 
440 	if (tb[ETHTOOL_A_BITSET_VALUE]) {
441 		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
442 				    "value only allowed in compact bitset");
443 		return -EINVAL;
444 	}
445 	if (tb[ETHTOOL_A_BITSET_MASK]) {
446 		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
447 				    "mask only allowed in compact bitset");
448 		return -EINVAL;
449 	}
450 	no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
451 
452 	nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
453 		bool old_val, new_val;
454 		unsigned int idx;
455 
456 		if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
457 			NL_SET_ERR_MSG_ATTR(extack, bit_attr,
458 					    "only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
459 			return -EINVAL;
460 		}
461 		ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
462 				      names, extack);
463 		if (ret < 0)
464 			return ret;
465 		old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
466 		if (new_val != old_val) {
467 			if (new_val)
468 				bitmap[idx / 32] |= ((u32)1 << (idx % 32));
469 			else
470 				bitmap[idx / 32] &= ~((u32)1 << (idx % 32));
471 			*mod = true;
472 		}
473 	}
474 
475 	return 0;
476 }
477 
478 static int ethnl_compact_sanity_checks(unsigned int nbits,
479 				       const struct nlattr *nest,
480 				       struct nlattr **tb,
481 				       struct netlink_ext_ack *extack)
482 {
483 	bool no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
484 	unsigned int attr_nbits, attr_nwords;
485 	const struct nlattr *test_attr;
486 
487 	if (no_mask && tb[ETHTOOL_A_BITSET_MASK]) {
488 		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
489 				    "mask not allowed in list bitset");
490 		return -EINVAL;
491 	}
492 	if (!tb[ETHTOOL_A_BITSET_SIZE]) {
493 		NL_SET_ERR_MSG_ATTR(extack, nest,
494 				    "missing size in compact bitset");
495 		return -EINVAL;
496 	}
497 	if (!tb[ETHTOOL_A_BITSET_VALUE]) {
498 		NL_SET_ERR_MSG_ATTR(extack, nest,
499 				    "missing value in compact bitset");
500 		return -EINVAL;
501 	}
502 	if (!no_mask && !tb[ETHTOOL_A_BITSET_MASK]) {
503 		NL_SET_ERR_MSG_ATTR(extack, nest,
504 				    "missing mask in compact nonlist bitset");
505 		return -EINVAL;
506 	}
507 
508 	attr_nbits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
509 	attr_nwords = DIV_ROUND_UP(attr_nbits, 32);
510 	if (nla_len(tb[ETHTOOL_A_BITSET_VALUE]) != attr_nwords * sizeof(u32)) {
511 		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
512 				    "bitset value length does not match size");
513 		return -EINVAL;
514 	}
515 	if (tb[ETHTOOL_A_BITSET_MASK] &&
516 	    nla_len(tb[ETHTOOL_A_BITSET_MASK]) != attr_nwords * sizeof(u32)) {
517 		NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
518 				    "bitset mask length does not match size");
519 		return -EINVAL;
520 	}
521 	if (attr_nbits <= nbits)
522 		return 0;
523 
524 	test_attr = no_mask ? tb[ETHTOOL_A_BITSET_VALUE] :
525 			      tb[ETHTOOL_A_BITSET_MASK];
526 	if (ethnl_bitmap32_not_zero(nla_data(test_attr), nbits, attr_nbits)) {
527 		NL_SET_ERR_MSG_ATTR(extack, test_attr,
528 				    "cannot modify bits past kernel bitset size");
529 		return -EINVAL;
530 	}
531 	return 0;
532 }
533 
534 /**
535  * ethnl_update_bitset32() - Apply a bitset nest to a u32 based bitmap
536  * @bitmap:  bitmap to update
537  * @nbits:   size of the updated bitmap in bits
538  * @attr:    nest attribute to parse and apply
539  * @names:   array of bit names; may be null for compact format
540  * @extack:  extack for error reporting
541  * @mod:     set this to true if bitmap is modified, leave as it is if not
542  *
543  * Apply bitset netsted attribute to a bitmap. If the attribute represents
544  * a bit list, @bitmap is set to its contents; otherwise, bits in mask are
545  * set to values from value. Bitmaps in the attribute may be longer than
546  * @nbits but the message must not request modifying any bits past @nbits.
547  *
548  * Return: negative error code on failure, 0 on success
549  */
550 int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
551 			  const struct nlattr *attr, ethnl_string_array_t names,
552 			  struct netlink_ext_ack *extack, bool *mod)
553 {
554 	struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
555 	unsigned int change_bits;
556 	bool no_mask;
557 	int ret;
558 
559 	if (!attr)
560 		return 0;
561 	ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
562 			       extack);
563 	if (ret < 0)
564 		return ret;
565 
566 	if (tb[ETHTOOL_A_BITSET_BITS])
567 		return ethnl_update_bitset32_verbose(bitmap, nbits, attr, tb,
568 						     names, extack, mod);
569 	ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
570 	if (ret < 0)
571 		return ret;
572 
573 	no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
574 	change_bits = min_t(unsigned int,
575 			    nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]), nbits);
576 	ethnl_bitmap32_update(bitmap, change_bits,
577 			      nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
578 			      no_mask ? NULL :
579 					nla_data(tb[ETHTOOL_A_BITSET_MASK]),
580 			      mod);
581 	if (no_mask && change_bits < nbits)
582 		ethnl_bitmap32_clear(bitmap, change_bits, nbits, mod);
583 
584 	return 0;
585 }
586 
587 #if BITS_PER_LONG == 64 && defined(__BIG_ENDIAN)
588 
589 /* 64-bit big endian architectures are the only case when u32 based bitmaps
590  * and unsigned long based bitmaps have different memory layout so that we
591  * cannot simply cast the latter to the former and need actual wrappers
592  * converting the latter to the former.
593  *
594  * To reduce the number of slab allocations, the wrappers use fixed size local
595  * variables for bitmaps up to ETHNL_SMALL_BITMAP_BITS bits which is the
596  * majority of bitmaps used by ethtool.
597  */
598 #define ETHNL_SMALL_BITMAP_BITS 128
599 #define ETHNL_SMALL_BITMAP_WORDS DIV_ROUND_UP(ETHNL_SMALL_BITMAP_BITS, 32)
600 
601 int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
602 		      unsigned int nbits, ethnl_string_array_t names,
603 		      bool compact)
604 {
605 	u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
606 	u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
607 	u32 *mask32;
608 	u32 *val32;
609 	int ret;
610 
611 	if (nbits > ETHNL_SMALL_BITMAP_BITS) {
612 		unsigned int nwords = DIV_ROUND_UP(nbits, 32);
613 
614 		val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
615 		if (!val32)
616 			return -ENOMEM;
617 		mask32 = val32 + nwords;
618 	} else {
619 		val32 = small_val32;
620 		mask32 = small_mask32;
621 	}
622 
623 	bitmap_to_arr32(val32, val, nbits);
624 	if (mask)
625 		bitmap_to_arr32(mask32, mask, nbits);
626 	else
627 		mask32 = NULL;
628 	ret = ethnl_bitset32_size(val32, mask32, nbits, names, compact);
629 
630 	if (nbits > ETHNL_SMALL_BITMAP_BITS)
631 		kfree(val32);
632 
633 	return ret;
634 }
635 
636 int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
637 		     const unsigned long *val, const unsigned long *mask,
638 		     unsigned int nbits, ethnl_string_array_t names,
639 		     bool compact)
640 {
641 	u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
642 	u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
643 	u32 *mask32;
644 	u32 *val32;
645 	int ret;
646 
647 	if (nbits > ETHNL_SMALL_BITMAP_BITS) {
648 		unsigned int nwords = DIV_ROUND_UP(nbits, 32);
649 
650 		val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
651 		if (!val32)
652 			return -ENOMEM;
653 		mask32 = val32 + nwords;
654 	} else {
655 		val32 = small_val32;
656 		mask32 = small_mask32;
657 	}
658 
659 	bitmap_to_arr32(val32, val, nbits);
660 	if (mask)
661 		bitmap_to_arr32(mask32, mask, nbits);
662 	else
663 		mask32 = NULL;
664 	ret = ethnl_put_bitset32(skb, attrtype, val32, mask32, nbits, names,
665 				 compact);
666 
667 	if (nbits > ETHNL_SMALL_BITMAP_BITS)
668 		kfree(val32);
669 
670 	return ret;
671 }
672 
673 int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
674 			const struct nlattr *attr, ethnl_string_array_t names,
675 			struct netlink_ext_ack *extack, bool *mod)
676 {
677 	u32 small_bitmap32[ETHNL_SMALL_BITMAP_WORDS];
678 	u32 *bitmap32 = small_bitmap32;
679 	bool u32_mod = false;
680 	int ret;
681 
682 	if (nbits > ETHNL_SMALL_BITMAP_BITS) {
683 		unsigned int dst_words = DIV_ROUND_UP(nbits, 32);
684 
685 		bitmap32 = kmalloc_array(dst_words, sizeof(u32), GFP_KERNEL);
686 		if (!bitmap32)
687 			return -ENOMEM;
688 	}
689 
690 	bitmap_to_arr32(bitmap32, bitmap, nbits);
691 	ret = ethnl_update_bitset32(bitmap32, nbits, attr, names, extack,
692 				    &u32_mod);
693 	if (u32_mod) {
694 		bitmap_from_arr32(bitmap, bitmap32, nbits);
695 		*mod = true;
696 	}
697 
698 	if (nbits > ETHNL_SMALL_BITMAP_BITS)
699 		kfree(bitmap32);
700 
701 	return ret;
702 }
703 
704 #else
705 
706 /* On little endian 64-bit and all 32-bit architectures, an unsigned long
707  * based bitmap can be interpreted as u32 based one using a simple cast.
708  */
709 
710 int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
711 		      unsigned int nbits, ethnl_string_array_t names,
712 		      bool compact)
713 {
714 	return ethnl_bitset32_size((const u32 *)val, (const u32 *)mask, nbits,
715 				   names, compact);
716 }
717 
718 int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
719 		     const unsigned long *val, const unsigned long *mask,
720 		     unsigned int nbits, ethnl_string_array_t names,
721 		     bool compact)
722 {
723 	return ethnl_put_bitset32(skb, attrtype, (const u32 *)val,
724 				  (const u32 *)mask, nbits, names, compact);
725 }
726 
727 int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
728 			const struct nlattr *attr, ethnl_string_array_t names,
729 			struct netlink_ext_ack *extack, bool *mod)
730 {
731 	return ethnl_update_bitset32((u32 *)bitmap, nbits, attr, names, extack,
732 				     mod);
733 }
734 
735 #endif /* BITS_PER_LONG == 64 && defined(__BIG_ENDIAN) */
736