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Merge branch 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / net / ethtool / bitset.c
CommitLineData
10b518d4
MK		 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
15static u32 ethnl_lower_bits(unsigned int n)
16{
17 return ~(u32)0 >> (32 - n % 32);
18}
19
20static 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 */
34static 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 */
86static 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 */
128static 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
153static 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 */
171int 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 */
232int 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
300nla_put_failure:
301 nla_nest_cancel(skb, nest);
302 return -EMSGSIZE;
303}
304
305static 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 },
e34f1753
MK		 308 [ETHTOOL_A_BITSET_SIZE] = NLA_POLICY_MAX(NLA_U32,
309 ETHNL_MAX_BITSET_SIZE),
10b518d4
MK		 310 [ETHTOOL_A_BITSET_BITS] = { .type = NLA_NESTED },
311 [ETHTOOL_A_BITSET_VALUE] = { .type = NLA_BINARY },
312 [ETHTOOL_A_BITSET_MASK] = { .type = NLA_BINARY },
313};
314
315static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
316 [ETHTOOL_A_BITSET_BIT_UNSPEC] = { .type = NLA_REJECT },
317 [ETHTOOL_A_BITSET_BIT_INDEX] = { .type = NLA_U32 },
318 [ETHTOOL_A_BITSET_BIT_NAME] = { .type = NLA_NUL_STRING },
319 [ETHTOOL_A_BITSET_BIT_VALUE] = { .type = NLA_FLAG },
320};
321
322/**
323 * ethnl_bitset_is_compact() - check if bitset attribute represents a compact
324 * bitset
325 * @bitset: nested attribute representing a bitset
326 * @compact: pointer for return value
327 *
328 * Return: 0 on success, negative error code on failure
329 */
330int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
331{
332 struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
333 int ret;
334
335 ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, bitset,
336 bitset_policy, NULL);
337 if (ret < 0)
338 return ret;
339
340 if (tb[ETHTOOL_A_BITSET_BITS]) {
341 if (tb[ETHTOOL_A_BITSET_VALUE] || tb[ETHTOOL_A_BITSET_MASK])
342 return -EINVAL;
343 *compact = false;
344 return 0;
345 }
346 if (!tb[ETHTOOL_A_BITSET_SIZE] || !tb[ETHTOOL_A_BITSET_VALUE])
347 return -EINVAL;
348
349 *compact = true;
350 return 0;
351}
352
353/**
354 * ethnl_name_to_idx() - look up string index for a name
355 * @names: array of ETH_GSTRING_LEN sized strings
356 * @n_names: number of strings in the array
357 * @name: name to look up
358 *
359 * Return: index of the string if found, -ENOENT if not found
360 */
361static int ethnl_name_to_idx(ethnl_string_array_t names, unsigned int n_names,
362 const char *name)
363{
364 unsigned int i;
365
366 if (!names)
367 return -ENOENT;
368
369 for (i = 0; i < n_names; i++) {
370 /* names[i] may not be null terminated */
371 if (!strncmp(names[i], name, ETH_GSTRING_LEN) &&
372 strlen(name) <= ETH_GSTRING_LEN)
373 return i;
374 }
375
376 return -ENOENT;
377}
378
379static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
380 const struct nlattr *bit_attr, bool no_mask,
381 ethnl_string_array_t names,
382 struct netlink_ext_ack *extack)
383{
384 struct nlattr *tb[ETHTOOL_A_BITSET_BIT_MAX + 1];
385 int ret, idx;
386
387 ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_BIT_MAX, bit_attr,
388 bit_policy, extack);
389 if (ret < 0)
390 return ret;
391
392 if (tb[ETHTOOL_A_BITSET_BIT_INDEX]) {
393 const char *name;
394
395 idx = nla_get_u32(tb[ETHTOOL_A_BITSET_BIT_INDEX]);
396 if (idx >= nbits) {
397 NL_SET_ERR_MSG_ATTR(extack,
398 tb[ETHTOOL_A_BITSET_BIT_INDEX],
399 "bit index too high");
400 return -EOPNOTSUPP;
401 }
402 name = names ? names[idx] : NULL;
403 if (tb[ETHTOOL_A_BITSET_BIT_NAME] && name &&
404 strncmp(nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]), name,
405 nla_len(tb[ETHTOOL_A_BITSET_BIT_NAME]))) {
406 NL_SET_ERR_MSG_ATTR(extack, bit_attr,
407 "bit index and name mismatch");
408 return -EINVAL;
409 }
410 } else if (tb[ETHTOOL_A_BITSET_BIT_NAME]) {
411 idx = ethnl_name_to_idx(names, nbits,
412 nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]));
413 if (idx < 0) {
414 NL_SET_ERR_MSG_ATTR(extack,
415 tb[ETHTOOL_A_BITSET_BIT_NAME],
416 "bit name not found");
417 return -EOPNOTSUPP;
418 }
419 } else {
420 NL_SET_ERR_MSG_ATTR(extack, bit_attr,
421 "neither bit index nor name specified");
422 return -EINVAL;
423 }
424
425 *index = idx;
426 *val = no_mask || tb[ETHTOOL_A_BITSET_BIT_VALUE];
427 return 0;
428}
429
430static int
431ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
432 const struct nlattr *attr, struct nlattr **tb,
433 ethnl_string_array_t names,
434 struct netlink_ext_ack *extack, bool *mod)
435{
436 struct nlattr *bit_attr;
437 bool no_mask;
438 int rem;
439 int ret;
440
441 if (tb[ETHTOOL_A_BITSET_VALUE]) {
442 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
443 "value only allowed in compact bitset");
444 return -EINVAL;
445 }
446 if (tb[ETHTOOL_A_BITSET_MASK]) {
447 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
448 "mask only allowed in compact bitset");
449 return -EINVAL;
450 }
66991703 451
10b518d4 452 no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
66991703
MK		 453 if (no_mask)
454 ethnl_bitmap32_clear(bitmap, 0, nbits, mod);
10b518d4
MK		 455
456 nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
457 bool old_val, new_val;
458 unsigned int idx;
459
460 if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
461 NL_SET_ERR_MSG_ATTR(extack, bit_attr,
462 "only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
463 return -EINVAL;
464 }
465 ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
466 names, extack);
467 if (ret < 0)
468 return ret;
469 old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
470 if (new_val != old_val) {
471 if (new_val)
472 bitmap[idx / 32] |= ((u32)1 << (idx % 32));
473 else
474 bitmap[idx / 32] &= ~((u32)1 << (idx % 32));
475 *mod = true;
476 }
477 }
478
479 return 0;
480}
481
482static int ethnl_compact_sanity_checks(unsigned int nbits,
483 const struct nlattr *nest,
484 struct nlattr **tb,
485 struct netlink_ext_ack *extack)
486{
487 bool no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
488 unsigned int attr_nbits, attr_nwords;
489 const struct nlattr *test_attr;
490
491 if (no_mask && tb[ETHTOOL_A_BITSET_MASK]) {
492 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
493 "mask not allowed in list bitset");
494 return -EINVAL;
495 }
496 if (!tb[ETHTOOL_A_BITSET_SIZE]) {
497 NL_SET_ERR_MSG_ATTR(extack, nest,
498 "missing size in compact bitset");
499 return -EINVAL;
500 }
501 if (!tb[ETHTOOL_A_BITSET_VALUE]) {
502 NL_SET_ERR_MSG_ATTR(extack, nest,
503 "missing value in compact bitset");
504 return -EINVAL;
505 }
506 if (!no_mask && !tb[ETHTOOL_A_BITSET_MASK]) {
507 NL_SET_ERR_MSG_ATTR(extack, nest,
508 "missing mask in compact nonlist bitset");
509 return -EINVAL;
510 }
511
512 attr_nbits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
513 attr_nwords = DIV_ROUND_UP(attr_nbits, 32);
514 if (nla_len(tb[ETHTOOL_A_BITSET_VALUE]) != attr_nwords * sizeof(u32)) {
515 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
516 "bitset value length does not match size");
517 return -EINVAL;
518 }
519 if (tb[ETHTOOL_A_BITSET_MASK] &&
520 nla_len(tb[ETHTOOL_A_BITSET_MASK]) != attr_nwords * sizeof(u32)) {
521 NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
522 "bitset mask length does not match size");
523 return -EINVAL;
524 }
525 if (attr_nbits <= nbits)
526 return 0;
527
528 test_attr = no_mask ? tb[ETHTOOL_A_BITSET_VALUE] :
529 tb[ETHTOOL_A_BITSET_MASK];
530 if (ethnl_bitmap32_not_zero(nla_data(test_attr), nbits, attr_nbits)) {
531 NL_SET_ERR_MSG_ATTR(extack, test_attr,
532 "cannot modify bits past kernel bitset size");
533 return -EINVAL;
534 }
535 return 0;
536}
537
538/**
539 * ethnl_update_bitset32() - Apply a bitset nest to a u32 based bitmap
540 * @bitmap: bitmap to update
541 * @nbits: size of the updated bitmap in bits
542 * @attr: nest attribute to parse and apply
543 * @names: array of bit names; may be null for compact format
544 * @extack: extack for error reporting
545 * @mod: set this to true if bitmap is modified, leave as it is if not
546 *
547 * Apply bitset netsted attribute to a bitmap. If the attribute represents
548 * a bit list, @bitmap is set to its contents; otherwise, bits in mask are
549 * set to values from value. Bitmaps in the attribute may be longer than
550 * @nbits but the message must not request modifying any bits past @nbits.
551 *
552 * Return: negative error code on failure, 0 on success
553 */
554int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
555 const struct nlattr *attr, ethnl_string_array_t names,
556 struct netlink_ext_ack *extack, bool *mod)
557{
558 struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
559 unsigned int change_bits;
560 bool no_mask;
561 int ret;
562
563 if (!attr)
564 return 0;
565 ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
566 extack);
567 if (ret < 0)
568 return ret;
569
570 if (tb[ETHTOOL_A_BITSET_BITS])
571 return ethnl_update_bitset32_verbose(bitmap, nbits, attr, tb,
572 names, extack, mod);
573 ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
574 if (ret < 0)
575 return ret;
576
577 no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
578 change_bits = min_t(unsigned int,
579 nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]), nbits);
580 ethnl_bitmap32_update(bitmap, change_bits,
581 nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
582 no_mask ? NULL :
583 nla_data(tb[ETHTOOL_A_BITSET_MASK]),
584 mod);
585 if (no_mask && change_bits < nbits)
586 ethnl_bitmap32_clear(bitmap, change_bits, nbits, mod);
587
588 return 0;
589}
590
591#if BITS_PER_LONG == 64 && defined(__BIG_ENDIAN)
592
593/* 64-bit big endian architectures are the only case when u32 based bitmaps
594 * and unsigned long based bitmaps have different memory layout so that we
595 * cannot simply cast the latter to the former and need actual wrappers
596 * converting the latter to the former.
597 *
598 * To reduce the number of slab allocations, the wrappers use fixed size local
599 * variables for bitmaps up to ETHNL_SMALL_BITMAP_BITS bits which is the
600 * majority of bitmaps used by ethtool.
601 */
602#define ETHNL_SMALL_BITMAP_BITS 128
603#define ETHNL_SMALL_BITMAP_WORDS DIV_ROUND_UP(ETHNL_SMALL_BITMAP_BITS, 32)
604
605int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
606 unsigned int nbits, ethnl_string_array_t names,
607 bool compact)
608{
609 u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
610 u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
611 u32 *mask32;
612 u32 *val32;
613 int ret;
614
615 if (nbits > ETHNL_SMALL_BITMAP_BITS) {
616 unsigned int nwords = DIV_ROUND_UP(nbits, 32);
617
618 val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
619 if (!val32)
620 return -ENOMEM;
621 mask32 = val32 + nwords;
622 } else {
623 val32 = small_val32;
624 mask32 = small_mask32;
625 }
626
627 bitmap_to_arr32(val32, val, nbits);
628 if (mask)
629 bitmap_to_arr32(mask32, mask, nbits);
630 else
631 mask32 = NULL;
632 ret = ethnl_bitset32_size(val32, mask32, nbits, names, compact);
633
634 if (nbits > ETHNL_SMALL_BITMAP_BITS)
635 kfree(val32);
636
637 return ret;
638}
639
640int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
641 const unsigned long *val, const unsigned long *mask,
642 unsigned int nbits, ethnl_string_array_t names,
643 bool compact)
644{
645 u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
646 u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
647 u32 *mask32;
648 u32 *val32;
649 int ret;
650
651 if (nbits > ETHNL_SMALL_BITMAP_BITS) {
652 unsigned int nwords = DIV_ROUND_UP(nbits, 32);
653
654 val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
655 if (!val32)
656 return -ENOMEM;
657 mask32 = val32 + nwords;
658 } else {
659 val32 = small_val32;
660 mask32 = small_mask32;
661 }
662
663 bitmap_to_arr32(val32, val, nbits);
664 if (mask)
665 bitmap_to_arr32(mask32, mask, nbits);
666 else
667 mask32 = NULL;
668 ret = ethnl_put_bitset32(skb, attrtype, val32, mask32, nbits, names,
669 compact);
670
671 if (nbits > ETHNL_SMALL_BITMAP_BITS)
672 kfree(val32);
673
674 return ret;
675}
676
677int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
678 const struct nlattr *attr, ethnl_string_array_t names,
679 struct netlink_ext_ack *extack, bool *mod)
680{
681 u32 small_bitmap32[ETHNL_SMALL_BITMAP_WORDS];
682 u32 *bitmap32 = small_bitmap32;
683 bool u32_mod = false;
684 int ret;
685
686 if (nbits > ETHNL_SMALL_BITMAP_BITS) {
687 unsigned int dst_words = DIV_ROUND_UP(nbits, 32);
688
689 bitmap32 = kmalloc_array(dst_words, sizeof(u32), GFP_KERNEL);
690 if (!bitmap32)
691 return -ENOMEM;
692 }
693
694 bitmap_to_arr32(bitmap32, bitmap, nbits);
695 ret = ethnl_update_bitset32(bitmap32, nbits, attr, names, extack,
696 &u32_mod);
697 if (u32_mod) {
698 bitmap_from_arr32(bitmap, bitmap32, nbits);
699 *mod = true;
700 }
701
702 if (nbits > ETHNL_SMALL_BITMAP_BITS)
703 kfree(bitmap32);
704
705 return ret;
706}
707
708#else
709
710/* On little endian 64-bit and all 32-bit architectures, an unsigned long
711 * based bitmap can be interpreted as u32 based one using a simple cast.
712 */
713
714int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
715 unsigned int nbits, ethnl_string_array_t names,
716 bool compact)
717{
718 return ethnl_bitset32_size((const u32 *)val, (const u32 *)mask, nbits,
719 names, compact);
720}
721
722int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
723 const unsigned long *val, const unsigned long *mask,
724 unsigned int nbits, ethnl_string_array_t names,
725 bool compact)
726{
727 return ethnl_put_bitset32(skb, attrtype, (const u32 *)val,
728 (const u32 *)mask, nbits, names, compact);
729}
730
731int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
732 const struct nlattr *attr, ethnl_string_array_t names,
733 struct netlink_ext_ack *extack, bool *mod)
734{
735 return ethnl_update_bitset32((u32 *)bitmap, nbits, attr, names, extack,
736 mod);
737}
738
739#endif /* BITS_PER_LONG == 64 && defined(__BIG_ENDIAN) */
Linux 6.x block layer and io_uring tree(s)