blob: 9a907d489d9517e7cb86e5e33f19f47285c4cac1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Bob Pearson78dff412012-03-23 15:02:24 -07002 * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
3 * cleaned up code to current version of sparse and added the slicing-by-8
4 * algorithm to the closely similar existing slicing-by-4 algorithm.
5 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
7 * Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks!
8 * Code was from the public domain, copyright abandoned. Code was
9 * subsequently included in the kernel, thus was re-licensed under the
10 * GNU GPL v2.
11 *
12 * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
13 * Same crc32 function was used in 5 other places in the kernel.
14 * I made one version, and deleted the others.
15 * There are various incantations of crc32(). Some use a seed of 0 or ~0.
16 * Some xor at the end with ~0. The generic crc32() function takes
17 * seed as an argument, and doesn't xor at the end. Then individual
18 * users can do whatever they need.
19 * drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
20 * fs/jffs2 uses seed 0, doesn't xor with ~0.
21 * fs/partitions/efi.c uses seed ~0, xor's with ~0.
22 *
23 * This source code is licensed under the GNU General Public License,
24 * Version 2. See the file COPYING for more details.
25 */
26
Bob Pearsonfbedceb2012-03-23 15:02:22 -070027/* see: Documentation/crc32.txt for a description of algorithms */
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/crc32.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/types.h>
Daniel Borkmanncc0ac192013-11-04 17:10:26 +010032#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "crc32defs.h"
Bob Pearson60e58d52012-03-23 15:02:22 -070034
Bob Pearson9a1dbf62012-03-23 15:02:23 -070035#if CRC_LE_BITS > 8
Fabian Frederick38b4fe52014-06-04 16:11:56 -070036# define tole(x) ((__force u32) cpu_to_le32(x))
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#else
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080038# define tole(x) (x)
39#endif
40
Bob Pearson9a1dbf62012-03-23 15:02:23 -070041#if CRC_BE_BITS > 8
Fabian Frederick38b4fe52014-06-04 16:11:56 -070042# define tobe(x) ((__force u32) cpu_to_be32(x))
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080043#else
44# define tobe(x) (x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#endif
Bob Pearson60e58d52012-03-23 15:02:22 -070046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "crc32table.h"
48
49MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
Darrick J. Wong46c58012012-03-23 15:02:25 -070050MODULE_DESCRIPTION("Various CRC32 calculations");
Linus Torvalds1da177e2005-04-16 15:20:36 -070051MODULE_LICENSE("GPL");
52
Bob Pearson9a1dbf62012-03-23 15:02:23 -070053#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080054
Bob Pearson324eb0f2012-03-23 15:02:24 -070055/* implements slicing-by-4 or slicing-by-8 algorithm */
George Spelvind8f1c472014-06-23 15:11:56 +020056static inline u32 __pure
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070057crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080058{
Andrew Morton0d2daf52010-05-25 23:43:03 -070059# ifdef __LITTLE_ENDIAN
Joakim Tjernlund57423322012-01-10 15:10:18 -080060# define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8)
Bob Pearson324eb0f2012-03-23 15:02:24 -070061# define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \
62 t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255])
63# define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \
64 t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255])
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080065# else
Joakim Tjernlund57423322012-01-10 15:10:18 -080066# define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
Bob Pearson324eb0f2012-03-23 15:02:24 -070067# define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \
68 t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255])
69# define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \
70 t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255])
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080071# endif
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080072 const u32 *b;
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080073 size_t rem_len;
Bob Pearson0292c492012-03-23 15:02:24 -070074# ifdef CONFIG_X86
75 size_t i;
76# endif
Joakim Tjernlund57423322012-01-10 15:10:18 -080077 const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
Thiago Rafael Becker49ac5722012-07-30 14:41:26 -070078# if CRC_LE_BITS != 32
Bob Pearson324eb0f2012-03-23 15:02:24 -070079 const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
Thiago Rafael Becker49ac5722012-07-30 14:41:26 -070080# endif
Bob Pearson324eb0f2012-03-23 15:02:24 -070081 u32 q;
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080082
83 /* Align it */
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080084 if (unlikely((long)buf & 3 && len)) {
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080085 do {
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080086 DO_CRC(*buf++);
87 } while ((--len) && ((long)buf)&3);
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080088 }
Bob Pearson324eb0f2012-03-23 15:02:24 -070089
90# if CRC_LE_BITS == 32
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080091 rem_len = len & 3;
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -080092 len = len >> 2;
Bob Pearson324eb0f2012-03-23 15:02:24 -070093# else
94 rem_len = len & 7;
95 len = len >> 3;
96# endif
97
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -080098 b = (const u32 *)buf;
Bob Pearson0292c492012-03-23 15:02:24 -070099# ifdef CONFIG_X86
100 --b;
101 for (i = 0; i < len; i++) {
102# else
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800103 for (--b; len; --len) {
Bob Pearson0292c492012-03-23 15:02:24 -0700104# endif
Bob Pearson324eb0f2012-03-23 15:02:24 -0700105 q = crc ^ *++b; /* use pre increment for speed */
106# if CRC_LE_BITS == 32
107 crc = DO_CRC4;
108# else
109 crc = DO_CRC8;
110 q = *++b;
111 crc ^= DO_CRC4;
112# endif
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800113 }
114 len = rem_len;
115 /* And the last few bytes */
116 if (len) {
117 u8 *p = (u8 *)(b + 1) - 1;
Bob Pearson0292c492012-03-23 15:02:24 -0700118# ifdef CONFIG_X86
119 for (i = 0; i < len; i++)
120 DO_CRC(*++p); /* use pre increment for speed */
121# else
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800122 do {
123 DO_CRC(*++p); /* use pre increment for speed */
124 } while (--len);
Bob Pearson0292c492012-03-23 15:02:24 -0700125# endif
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800126 }
127 return crc;
Joakim Tjernlund4f2a94632010-03-05 13:43:55 -0800128#undef DO_CRC
Joakim Tjernlund836e2af2010-05-24 14:33:31 -0700129#undef DO_CRC4
Bob Pearson324eb0f2012-03-23 15:02:24 -0700130#undef DO_CRC8
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800131}
132#endif
Bob Pearson60e58d52012-03-23 15:02:22 -0700133
Daniel Borkmann6e95fca2013-10-30 11:50:49 +0100134
Randy Dunlap2f721002006-06-25 05:48:59 -0700135/**
Gu Zhengf2e1d2a2013-09-11 14:23:52 -0700136 * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II
137 * CRC32/CRC32C
138 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for other
139 * uses, or the previous crc32/crc32c value if computing incrementally.
140 * @p: pointer to buffer over which CRC32/CRC32C is run
Randy Dunlap2f721002006-06-25 05:48:59 -0700141 * @len: length of buffer @p
Gu Zhengf2e1d2a2013-09-11 14:23:52 -0700142 * @tab: little-endian Ethernet table
143 * @polynomial: CRC32/CRC32c LE polynomial
Randy Dunlap2f721002006-06-25 05:48:59 -0700144 */
Darrick J. Wong46c58012012-03-23 15:02:25 -0700145static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p,
146 size_t len, const u32 (*tab)[256],
147 u32 polynomial)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Bob Pearson60e58d52012-03-23 15:02:22 -0700149#if CRC_LE_BITS == 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 int i;
151 while (len--) {
152 crc ^= *p++;
153 for (i = 0; i < 8; i++)
Darrick J. Wong46c58012012-03-23 15:02:25 -0700154 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
Bob Pearson60e58d52012-03-23 15:02:22 -0700156# elif CRC_LE_BITS == 2
157 while (len--) {
158 crc ^= *p++;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700159 crc = (crc >> 2) ^ tab[0][crc & 3];
160 crc = (crc >> 2) ^ tab[0][crc & 3];
161 crc = (crc >> 2) ^ tab[0][crc & 3];
162 crc = (crc >> 2) ^ tab[0][crc & 3];
Bob Pearson60e58d52012-03-23 15:02:22 -0700163 }
164# elif CRC_LE_BITS == 4
165 while (len--) {
166 crc ^= *p++;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700167 crc = (crc >> 4) ^ tab[0][crc & 15];
168 crc = (crc >> 4) ^ tab[0][crc & 15];
Bob Pearson60e58d52012-03-23 15:02:22 -0700169 }
170# elif CRC_LE_BITS == 8
Bob Pearson9a1dbf62012-03-23 15:02:23 -0700171 /* aka Sarwate algorithm */
172 while (len--) {
173 crc ^= *p++;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700174 crc = (crc >> 8) ^ tab[0][crc & 255];
Bob Pearson9a1dbf62012-03-23 15:02:23 -0700175 }
176# else
Bob Pearsonce4320d2012-03-23 15:02:23 -0700177 crc = (__force u32) __cpu_to_le32(crc);
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800178 crc = crc32_body(crc, p, len, tab);
Bob Pearsonce4320d2012-03-23 15:02:23 -0700179 crc = __le32_to_cpu((__force __le32)crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180#endif
Bob Pearson60e58d52012-03-23 15:02:22 -0700181 return crc;
182}
Darrick J. Wong46c58012012-03-23 15:02:25 -0700183
184#if CRC_LE_BITS == 1
185u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
186{
187 return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE);
188}
189u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
190{
191 return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE);
192}
193#else
194u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
195{
Joe Mario8f243af2012-10-04 17:12:15 -0700196 return crc32_le_generic(crc, p, len,
197 (const u32 (*)[256])crc32table_le, CRCPOLY_LE);
Darrick J. Wong46c58012012-03-23 15:02:25 -0700198}
199u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
200{
Joe Mario8f243af2012-10-04 17:12:15 -0700201 return crc32_le_generic(crc, p, len,
202 (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
Darrick J. Wong46c58012012-03-23 15:02:25 -0700203}
204#endif
George Spelvin6d514b42014-06-23 15:11:54 +0200205EXPORT_SYMBOL(crc32_le);
206EXPORT_SYMBOL(__crc32c_le);
207
208/*
209 * This multiplies the polynomials x and y modulo the given modulus.
210 * This follows the "little-endian" CRC convention that the lsbit
211 * represents the highest power of x, and the msbit represents x^0.
212 */
213static u32 __attribute_const__ gf2_multiply(u32 x, u32 y, u32 modulus)
Daniel Borkmann6e95fca2013-10-30 11:50:49 +0100214{
George Spelvin6d514b42014-06-23 15:11:54 +0200215 u32 product = x & 1 ? y : 0;
216 int i;
217
218 for (i = 0; i < 31; i++) {
219 product = (product >> 1) ^ (product & 1 ? modulus : 0);
220 x >>= 1;
221 product ^= x & 1 ? y : 0;
222 }
223
224 return product;
Daniel Borkmann6e95fca2013-10-30 11:50:49 +0100225}
226
George Spelvin6d514b42014-06-23 15:11:54 +0200227/**
228 * crc32_generic_shift - Append len 0 bytes to crc, in logarithmic time
229 * @crc: The original little-endian CRC (i.e. lsbit is x^31 coefficient)
230 * @len: The number of bytes. @crc is multiplied by x^(8*@len)
231 * @polynomial: The modulus used to reduce the result to 32 bits.
232 *
233 * It's possible to parallelize CRC computations by computing a CRC
234 * over separate ranges of a buffer, then summing them.
235 * This shifts the given CRC by 8*len bits (i.e. produces the same effect
236 * as appending len bytes of zero to the data), in time proportional
237 * to log(len).
238 */
239static u32 __attribute_const__ crc32_generic_shift(u32 crc, size_t len,
240 u32 polynomial)
Daniel Borkmann6e95fca2013-10-30 11:50:49 +0100241{
George Spelvin6d514b42014-06-23 15:11:54 +0200242 u32 power = polynomial; /* CRC of x^32 */
243 int i;
244
245 /* Shift up to 32 bits in the simple linear way */
246 for (i = 0; i < 8 * (int)(len & 3); i++)
247 crc = (crc >> 1) ^ (crc & 1 ? polynomial : 0);
248
249 len >>= 2;
250 if (!len)
251 return crc;
252
253 for (;;) {
254 /* "power" is x^(2^i), modulo the polynomial */
255 if (len & 1)
256 crc = gf2_multiply(crc, power, polynomial);
257
258 len >>= 1;
259 if (!len)
260 break;
261
262 /* Square power, advancing to x^(2^(i+1)) */
263 power = gf2_multiply(power, power, polynomial);
264 }
265
266 return crc;
Daniel Borkmann6e95fca2013-10-30 11:50:49 +0100267}
George Spelvin6d514b42014-06-23 15:11:54 +0200268
269u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len)
270{
271 return crc32_generic_shift(crc, len, CRCPOLY_LE);
272}
273
274u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len)
275{
276 return crc32_generic_shift(crc, len, CRC32C_POLY_LE);
277}
278EXPORT_SYMBOL(crc32_le_shift);
279EXPORT_SYMBOL(__crc32c_le_shift);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Randy Dunlap2f721002006-06-25 05:48:59 -0700281/**
Gu Zhengf2e1d2a2013-09-11 14:23:52 -0700282 * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
Randy Dunlap2f721002006-06-25 05:48:59 -0700283 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
284 * other uses, or the previous crc32 value if computing incrementally.
Gu Zhengf2e1d2a2013-09-11 14:23:52 -0700285 * @p: pointer to buffer over which CRC32 is run
Randy Dunlap2f721002006-06-25 05:48:59 -0700286 * @len: length of buffer @p
Gu Zhengf2e1d2a2013-09-11 14:23:52 -0700287 * @tab: big-endian Ethernet table
288 * @polynomial: CRC32 BE polynomial
Randy Dunlap2f721002006-06-25 05:48:59 -0700289 */
Darrick J. Wong46c58012012-03-23 15:02:25 -0700290static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p,
291 size_t len, const u32 (*tab)[256],
292 u32 polynomial)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
Bob Pearson60e58d52012-03-23 15:02:22 -0700294#if CRC_BE_BITS == 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 int i;
296 while (len--) {
297 crc ^= *p++ << 24;
298 for (i = 0; i < 8; i++)
299 crc =
Darrick J. Wong46c58012012-03-23 15:02:25 -0700300 (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 0);
302 }
Bob Pearson60e58d52012-03-23 15:02:22 -0700303# elif CRC_BE_BITS == 2
304 while (len--) {
305 crc ^= *p++ << 24;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700306 crc = (crc << 2) ^ tab[0][crc >> 30];
307 crc = (crc << 2) ^ tab[0][crc >> 30];
308 crc = (crc << 2) ^ tab[0][crc >> 30];
309 crc = (crc << 2) ^ tab[0][crc >> 30];
Bob Pearson60e58d52012-03-23 15:02:22 -0700310 }
311# elif CRC_BE_BITS == 4
312 while (len--) {
313 crc ^= *p++ << 24;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700314 crc = (crc << 4) ^ tab[0][crc >> 28];
315 crc = (crc << 4) ^ tab[0][crc >> 28];
Bob Pearson60e58d52012-03-23 15:02:22 -0700316 }
317# elif CRC_BE_BITS == 8
Bob Pearson9a1dbf62012-03-23 15:02:23 -0700318 while (len--) {
319 crc ^= *p++ << 24;
Darrick J. Wong46c58012012-03-23 15:02:25 -0700320 crc = (crc << 8) ^ tab[0][crc >> 24];
Bob Pearson9a1dbf62012-03-23 15:02:23 -0700321 }
322# else
Bob Pearsonce4320d2012-03-23 15:02:23 -0700323 crc = (__force u32) __cpu_to_be32(crc);
Joakim Tjernlundddcaccb2009-12-14 18:01:33 -0800324 crc = crc32_body(crc, p, len, tab);
Bob Pearsonce4320d2012-03-23 15:02:23 -0700325 crc = __be32_to_cpu((__force __be32)crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326# endif
Bob Pearson60e58d52012-03-23 15:02:22 -0700327 return crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
Darrick J. Wong46c58012012-03-23 15:02:25 -0700329
330#if CRC_LE_BITS == 1
331u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
332{
333 return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE);
334}
335#else
336u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
337{
Joe Mario8f243af2012-10-04 17:12:15 -0700338 return crc32_be_generic(crc, p, len,
339 (const u32 (*)[256])crc32table_be, CRCPOLY_BE);
Darrick J. Wong46c58012012-03-23 15:02:25 -0700340}
341#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342EXPORT_SYMBOL(crc32_be);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Bob Pearson3863ef32012-03-23 15:02:22 -0700344#ifdef CONFIG_CRC32_SELFTEST
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Bob Pearson3863ef32012-03-23 15:02:22 -0700346/* 4096 random bytes */
George Spelvin4fa8e032014-06-23 15:11:55 +0200347static u8 const __aligned(8) test_buf[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
Bob Pearson3863ef32012-03-23 15:02:22 -0700349 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
350 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
351 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
352 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
353 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
354 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
355 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
356 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
357 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
358 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
359 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
360 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
361 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
362 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
363 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
364 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
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802 0xf4, 0xcc, 0x10, 0xb4, 0xc7, 0xfe, 0x79, 0x51,
803 0xc3, 0xc5, 0xac, 0x88, 0x74, 0x84, 0x0b, 0x4b,
804 0xca, 0x79, 0x16, 0x29, 0xfb, 0x69, 0x54, 0xdf,
805 0x41, 0x7e, 0xe9, 0xc7, 0x8e, 0xea, 0xa5, 0xfe,
806 0xfc, 0x76, 0x0e, 0x90, 0xc4, 0x92, 0x38, 0xad,
807 0x7b, 0x48, 0xe6, 0x6e, 0xf7, 0x21, 0xfd, 0x4e,
808 0x93, 0x0a, 0x7b, 0x41, 0x83, 0x68, 0xfb, 0x57,
809 0x51, 0x76, 0x34, 0xa9, 0x6c, 0x00, 0xaa, 0x4f,
810 0x66, 0x65, 0x98, 0x4a, 0x4f, 0xa3, 0xa0, 0xef,
811 0x69, 0x3f, 0xe3, 0x1c, 0x92, 0x8c, 0xfd, 0xd8,
812 0xe8, 0xde, 0x7c, 0x7f, 0x3e, 0x84, 0x8e, 0x69,
813 0x3c, 0xf1, 0xf2, 0x05, 0x46, 0xdc, 0x2f, 0x9d,
814 0x5e, 0x6e, 0x4c, 0xfb, 0xb5, 0x99, 0x2a, 0x59,
815 0x63, 0xc1, 0x34, 0xbc, 0x57, 0xc0, 0x0d, 0xb9,
816 0x61, 0x25, 0xf3, 0x33, 0x23, 0x51, 0xb6, 0x0d,
817 0x07, 0xa6, 0xab, 0x94, 0x4a, 0xb7, 0x2a, 0xea,
818 0xee, 0xac, 0xa3, 0xc3, 0x04, 0x8b, 0x0e, 0x56,
819 0xfe, 0x44, 0xa7, 0x39, 0xe2, 0xed, 0xed, 0xb4,
820 0x22, 0x2b, 0xac, 0x12, 0x32, 0x28, 0x91, 0xd8,
821 0xa5, 0xab, 0xff, 0x5f, 0xe0, 0x4b, 0xda, 0x78,
822 0x17, 0xda, 0xf1, 0x01, 0x5b, 0xcd, 0xe2, 0x5f,
823 0x50, 0x45, 0x73, 0x2b, 0xe4, 0x76, 0x77, 0xf4,
824 0x64, 0x1d, 0x43, 0xfb, 0x84, 0x7a, 0xea, 0x91,
825 0xae, 0xf9, 0x9e, 0xb7, 0xb4, 0xb0, 0x91, 0x5f,
826 0x16, 0x35, 0x9a, 0x11, 0xb8, 0xc7, 0xc1, 0x8c,
827 0xc6, 0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57,
828 0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4,
829 0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23,
830 0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17,
831 0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66,
832 0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39,
833 0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36,
834 0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00,
835 0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7,
836 0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60,
837 0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c,
838 0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
839 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
840 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
841 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
842 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
843 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
844 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
845 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
846 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
847 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
848 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
849 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
850 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
851 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
852 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
853 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
854 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
855 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
856 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
857 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
858 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
859 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
860 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
861};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Bob Pearson3863ef32012-03-23 15:02:22 -0700863/* 100 test cases */
864static struct crc_test {
865 u32 crc; /* random starting crc */
866 u32 start; /* random 6 bit offset in buf */
867 u32 length; /* random 11 bit length of test */
868 u32 crc_le; /* expected crc32_le result */
869 u32 crc_be; /* expected crc32_be result */
Darrick J. Wong577eba92012-03-23 15:02:26 -0700870 u32 crc32c_le; /* expected crc32c_le result */
George Spelvin4fa8e032014-06-23 15:11:55 +0200871} const test[] __initconst =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872{
Daniel Borkmannd921e042013-10-30 11:50:48 +0100873 {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, 0xf6e93d6c},
874 {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, 0x0fe92aca},
875 {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f, 0x52e1ebb8},
876 {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a, 0x0798af9a},
877 {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2, 0x18eb3152},
878 {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793, 0xd00d08c7},
879 {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed, 0x8ba966bc},
880 {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35, 0x11d694a2},
881 {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2, 0x6ab3208d},
882 {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10, 0xba4603c5},
883 {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb, 0xe6071c6f},
884 {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0, 0x179ec30a},
885 {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb, 0x0903beb8},
886 {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed, 0x6a7cb4fa},
887 {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591, 0xdb535801},
888 {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67, 0x92bed597},
889 {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd, 0x192a3f1b},
890 {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a, 0xccbaec1a},
891 {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b, 0x7eabae4d},
892 {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f, 0x28c72982},
893 {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d, 0xc3cd4d18},
894 {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a, 0xbca8f0e7},
895 {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97, 0x713f60b3},
896 {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2, 0xebd08fd5},
897 {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138, 0x64406c59},
898 {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032, 0x7421890e},
899 {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f, 0xe9347603},
900 {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f, 0x1bef9060},
901 {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32, 0x34720072},
902 {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef, 0x48310f59},
903 {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0, 0x783a4213},
904 {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59, 0x9e8efd41},
905 {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4, 0xfc3d34a5},
906 {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c, 0x17a52ae2},
907 {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51, 0x886d935a},
908 {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11, 0xeaaeaeb2},
909 {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659, 0x8e900a4b},
910 {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af, 0xd74662b1},
911 {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99, 0xd26752ba},
912 {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b, 0x8b1fcd62},
913 {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521, 0xf54342fe},
914 {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3, 0x5b95b988},
915 {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d, 0x2e1176be},
916 {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f, 0x66120546},
917 {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b, 0xf256a5cc},
918 {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0, 0x4af1dd69},
919 {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195, 0x56f0a04a},
920 {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d, 0x74f6b6b2},
921 {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4, 0x085951fd},
922 {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3, 0xc65387eb},
923 {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643, 0x1ca9257b},
924 {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10, 0xfd196d76},
925 {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d, 0x5ef88339},
926 {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5, 0x2c3714d9},
927 {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b, 0x58576548},
928 {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee, 0xfd7c57de},
929 {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14, 0xd5fedd59},
930 {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a, 0x1cc3b17b},
931 {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b, 0x270eed73},
932 {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3, 0x91ecbb11},
933 {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826, 0x05ed8d0c},
934 {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06, 0x0b09ad5b},
935 {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35, 0xf8d511fb},
936 {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801, 0x5ad832cc},
937 {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2, 0x1214d196},
938 {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d, 0x5747218a},
939 {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c, 0xde8f14de},
940 {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba, 0x3563b7b9},
941 {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5, 0x071475d0},
942 {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b, 0x54c79d60},
943 {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178, 0x4c53eee6},
944 {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3, 0x10137a3c},
945 {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605, 0xaa9d6c73},
946 {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1, 0xb63d23e7},
947 {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9, 0x7f53e9cf},
948 {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78, 0x13c1cd83},
949 {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9, 0x49ff5867},
950 {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd, 0x8467f211},
951 {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab, 0x3f9683b2},
952 {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb, 0x76a3f874},
953 {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77, 0x863b702f},
954 {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da, 0xdc6c58ff},
955 {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39, 0x0622cc95},
956 {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16, 0xe85605cd},
957 {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208, 0x31da5f06},
958 {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e, 0xa1f2e784},
959 {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5, 0xb07cc616},
960 {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892, 0xbf943b6c},
961 {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db, 0x2c01af1c},
962 {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43, 0x0fe5f56d},
963 {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac, 0xf8943b2d},
964 {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7, 0xe4d89272},
965 {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2, 0x7c2f6bbb},
966 {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2, 0xabbf388b},
967 {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640, 0x1dca1f4e},
968 {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f, 0x5c170e23},
969 {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99, 0xc0e9d672},
970 {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7, 0xc18bdc86},
971 {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499, 0xa874fcdd},
972 {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a, 0x9dc0bb48},
Bob Pearson3863ef32012-03-23 15:02:22 -0700973};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Bob Pearson3863ef32012-03-23 15:02:22 -0700975#include <linux/time.h>
976
Darrick J. Wong577eba92012-03-23 15:02:26 -0700977static int __init crc32c_test(void)
978{
979 int i;
980 int errors = 0;
981 int bytes = 0;
982 struct timespec start, stop;
983 u64 nsec;
984 unsigned long flags;
985
986 /* keep static to prevent cache warming code from
987 * getting eliminated by the compiler */
988 static u32 crc;
989
990 /* pre-warm the cache */
991 for (i = 0; i < 100; i++) {
992 bytes += 2*test[i].length;
993
994 crc ^= __crc32c_le(test[i].crc, test_buf +
995 test[i].start, test[i].length);
996 }
997
998 /* reduce OS noise */
999 local_irq_save(flags);
1000 local_irq_disable();
1001
1002 getnstimeofday(&start);
1003 for (i = 0; i < 100; i++) {
1004 if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf +
1005 test[i].start, test[i].length))
1006 errors++;
1007 }
1008 getnstimeofday(&stop);
1009
1010 local_irq_restore(flags);
1011 local_irq_enable();
1012
1013 nsec = stop.tv_nsec - start.tv_nsec +
1014 1000000000 * (stop.tv_sec - start.tv_sec);
1015
1016 pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS);
1017
1018 if (errors)
1019 pr_warn("crc32c: %d self tests failed\n", errors);
1020 else {
1021 pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n",
1022 bytes, nsec);
1023 }
1024
1025 return 0;
1026}
1027
Daniel Borkmannefba7212013-10-30 11:50:50 +01001028static int __init crc32c_combine_test(void)
1029{
1030 int i, j;
1031 int errors = 0, runs = 0;
1032
Daniel Borkmann16514832013-11-04 17:10:27 +01001033 for (i = 0; i < 10; i++) {
Daniel Borkmannefba7212013-10-30 11:50:50 +01001034 u32 crc_full;
1035
1036 crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start,
1037 test[i].length);
1038 for (j = 0; j <= test[i].length; ++j) {
1039 u32 crc1, crc2;
1040 u32 len1 = j, len2 = test[i].length - j;
1041
1042 crc1 = __crc32c_le(test[i].crc, test_buf +
1043 test[i].start, len1);
1044 crc2 = __crc32c_le(0, test_buf + test[i].start +
1045 len1, len2);
1046
1047 if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) &&
1048 crc_full == test[i].crc32c_le))
1049 errors++;
1050 runs++;
Daniel Borkmanncc0ac192013-11-04 17:10:26 +01001051 cond_resched();
Daniel Borkmannefba7212013-10-30 11:50:50 +01001052 }
1053 }
1054
1055 if (errors)
1056 pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs);
1057 else
1058 pr_info("crc32c_combine: %d self tests passed\n", runs);
1059
1060 return 0;
1061}
1062
Darrick J. Wong577eba92012-03-23 15:02:26 -07001063static int __init crc32_test(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064{
Bob Pearson3863ef32012-03-23 15:02:22 -07001065 int i;
1066 int errors = 0;
1067 int bytes = 0;
1068 struct timespec start, stop;
1069 u64 nsec;
1070 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
Bob Pearson3863ef32012-03-23 15:02:22 -07001072 /* keep static to prevent cache warming code from
1073 * getting eliminated by the compiler */
1074 static u32 crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Bob Pearson3863ef32012-03-23 15:02:22 -07001076 /* pre-warm the cache */
1077 for (i = 0; i < 100; i++) {
1078 bytes += 2*test[i].length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
Bob Pearson3863ef32012-03-23 15:02:22 -07001080 crc ^= crc32_le(test[i].crc, test_buf +
1081 test[i].start, test[i].length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Bob Pearson3863ef32012-03-23 15:02:22 -07001083 crc ^= crc32_be(test[i].crc, test_buf +
1084 test[i].start, test[i].length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 }
1086
Bob Pearson3863ef32012-03-23 15:02:22 -07001087 /* reduce OS noise */
1088 local_irq_save(flags);
1089 local_irq_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Bob Pearson3863ef32012-03-23 15:02:22 -07001091 getnstimeofday(&start);
1092 for (i = 0; i < 100; i++) {
1093 if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
1094 test[i].start, test[i].length))
1095 errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Bob Pearson3863ef32012-03-23 15:02:22 -07001097 if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
1098 test[i].start, test[i].length))
1099 errors++;
1100 }
1101 getnstimeofday(&stop);
1102
1103 local_irq_restore(flags);
1104 local_irq_enable();
1105
1106 nsec = stop.tv_nsec - start.tv_nsec +
1107 1000000000 * (stop.tv_sec - start.tv_sec);
1108
1109 pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
1110 CRC_LE_BITS, CRC_BE_BITS);
1111
1112 if (errors)
1113 pr_warn("crc32: %d self tests failed\n", errors);
1114 else {
1115 pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
1116 bytes, nsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 }
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 return 0;
1120}
1121
Daniel Borkmannefba7212013-10-30 11:50:50 +01001122static int __init crc32_combine_test(void)
1123{
1124 int i, j;
1125 int errors = 0, runs = 0;
1126
Daniel Borkmann16514832013-11-04 17:10:27 +01001127 for (i = 0; i < 10; i++) {
Daniel Borkmannefba7212013-10-30 11:50:50 +01001128 u32 crc_full;
1129
1130 crc_full = crc32_le(test[i].crc, test_buf + test[i].start,
1131 test[i].length);
1132 for (j = 0; j <= test[i].length; ++j) {
1133 u32 crc1, crc2;
1134 u32 len1 = j, len2 = test[i].length - j;
1135
1136 crc1 = crc32_le(test[i].crc, test_buf +
1137 test[i].start, len1);
1138 crc2 = crc32_le(0, test_buf + test[i].start +
1139 len1, len2);
1140
1141 if (!(crc_full == crc32_le_combine(crc1, crc2, len2) &&
1142 crc_full == test[i].crc_le))
1143 errors++;
1144 runs++;
Daniel Borkmanncc0ac192013-11-04 17:10:26 +01001145 cond_resched();
Daniel Borkmannefba7212013-10-30 11:50:50 +01001146 }
1147 }
1148
1149 if (errors)
1150 pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs);
1151 else
1152 pr_info("crc32_combine: %d self tests passed\n", runs);
1153
1154 return 0;
1155}
1156
Darrick J. Wong577eba92012-03-23 15:02:26 -07001157static int __init crc32test_init(void)
1158{
1159 crc32_test();
1160 crc32c_test();
Daniel Borkmannefba7212013-10-30 11:50:50 +01001161
1162 crc32_combine_test();
1163 crc32c_combine_test();
1164
Darrick J. Wong577eba92012-03-23 15:02:26 -07001165 return 0;
1166}
1167
Bob Pearson3863ef32012-03-23 15:02:22 -07001168static void __exit crc32_exit(void)
1169{
1170}
1171
Darrick J. Wong577eba92012-03-23 15:02:26 -07001172module_init(crc32test_init);
Bob Pearson3863ef32012-03-23 15:02:22 -07001173module_exit(crc32_exit);
1174#endif /* CONFIG_CRC32_SELFTEST */