* [patch v5 1/8] crc32-add-pointer-to-tab.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
@ 2011-08-10 22:43 ` Bob Pearson
2011-08-10 22:43 ` [patch v5 2/8] crc32-move-to-documentation.diff Bob Pearson
` (6 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:43 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
replace 2D array references by pointer references in loops
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -51,20 +51,21 @@ static inline u32
crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
{
# ifdef __LITTLE_ENDIAN
-# define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8)
-# define DO_CRC4 crc = tab[3][(crc) & 255] ^ \
- tab[2][(crc >> 8) & 255] ^ \
- tab[1][(crc >> 16) & 255] ^ \
- tab[0][(crc >> 24) & 255]
+# define DO_CRC(x) (crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8))
+# define DO_CRC4 crc = t3[(crc) & 255] ^ \
+ t2[(crc >> 8) & 255] ^ \
+ t1[(crc >> 16) & 255] ^ \
+ t0[(crc >> 24) & 255]
# else
-# define DO_CRC(x) crc = tab[0][((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
-# define DO_CRC4 crc = tab[0][(crc) & 255] ^ \
- tab[1][(crc >> 8) & 255] ^ \
- tab[2][(crc >> 16) & 255] ^ \
- tab[3][(crc >> 24) & 255]
+# define DO_CRC(x) (crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8))
+# define DO_CRC4 crc = t0[(crc) & 255] ^ \
+ t1[(crc >> 8) & 255] ^ \
+ t2[(crc >> 16) & 255] ^ \
+ t3[(crc >> 24) & 255]
# endif
const u32 *b;
size_t rem_len;
+ const u32 *t0 = tab[0], *t1 = tab[1], *t2 = tab[2], *t3 = tab[3];
/* Align it */
if (unlikely((long)buf & 3 && len)) {
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 2/8] crc32-move-to-documentation.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
2011-08-10 22:43 ` [patch v5 1/8] crc32-add-pointer-to-tab.diff Bob Pearson
@ 2011-08-10 22:43 ` Bob Pearson
2011-08-10 22:44 ` [patch v5 3/8] crc32-replace-self-test.diff Bob Pearson
` (5 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:43 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
Moved a nice but long comment from lib/crc32.c to Documentation/crc32.txt
where it will more likely get read.
Edited the resulting document to add an explanation of the slicing-by-n
algorithm.
Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
Documentation/00-INDEX | 2 Documentation/crc32.txt | 183 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/crc32.c | 127 ---------------------------------
3 files changed, 185 insertions(+), 127 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -209,133 +209,6 @@ u32 __pure crc32_be(u32 crc, unsigned ch
EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(crc32_be);
-/*
- * A brief CRC tutorial.
- *
- * A CRC is a long-division remainder. You add the CRC to the message,
- * and the whole thing (message+CRC) is a multiple of the given
- * CRC polynomial. To check the CRC, you can either check that the
- * CRC matches the recomputed value, *or* you can check that the
- * remainder computed on the message+CRC is 0. This latter approach
- * is used by a lot of hardware implementations, and is why so many
- * protocols put the end-of-frame flag after the CRC.
- *
- * It's actually the same long division you learned in school, except that
- * - We're working in binary, so the digits are only 0 and 1, and
- * - When dividing polynomials, there are no carries. Rather than add and
- * subtract, we just xor. Thus, we tend to get a bit sloppy about
- * the difference between adding and subtracting.
- *
- * A 32-bit CRC polynomial is actually 33 bits long. But since it's
- * 33 bits long, bit 32 is always going to be set, so usually the CRC
- * is written in hex with the most significant bit omitted. (If you're
- * familiar with the IEEE 754 floating-point format, it's the same idea.)
- *
- * Note that a CRC is computed over a string of *bits*, so you have
- * to decide on the endianness of the bits within each byte. To get
- * the best error-detecting properties, this should correspond to the
- * order they're actually sent. For example, standard RS-232 serial is
- * little-endian; the most significant bit (sometimes used for parity)
- * is sent last. And when appending a CRC word to a message, you should
- * do it in the right order, matching the endianness.
- *
- * Just like with ordinary division, the remainder is always smaller than
- * the divisor (the CRC polynomial) you're dividing by. Each step of the
- * division, you take one more digit (bit) of the dividend and append it
- * to the current remainder. Then you figure out the appropriate multiple
- * of the divisor to subtract to being the remainder back into range.
- * In binary, it's easy - it has to be either 0 or 1, and to make the
- * XOR cancel, it's just a copy of bit 32 of the remainder.
- *
- * When computing a CRC, we don't care about the quotient, so we can
- * throw the quotient bit away, but subtract the appropriate multiple of
- * the polynomial from the remainder and we're back to where we started,
- * ready to process the next bit.
- *
- * A big-endian CRC written this way would be coded like:
- * for (i = 0; i < input_bits; i++) {
- * multiple = remainder & 0x80000000 ? CRCPOLY : 0;
- * remainder = (remainder << 1 | next_input_bit()) ^ multiple;
- * }
- * Notice how, to get at bit 32 of the shifted remainder, we look
- * at bit 31 of the remainder *before* shifting it.
- *
- * But also notice how the next_input_bit() bits we're shifting into
- * the remainder don't actually affect any decision-making until
- * 32 bits later. Thus, the first 32 cycles of this are pretty boring.
- * Also, to add the CRC to a message, we need a 32-bit-long hole for it at
- * the end, so we have to add 32 extra cycles shifting in zeros at the
- * end of every message,
- *
- * So the standard trick is to rearrage merging in the next_input_bit()
- * until the moment it's needed. Then the first 32 cycles can be precomputed,
- * and merging in the final 32 zero bits to make room for the CRC can be
- * skipped entirely.
- * This changes the code to:
- * for (i = 0; i < input_bits; i++) {
- * remainder ^= next_input_bit() << 31;
- * multiple = (remainder & 0x80000000) ? CRCPOLY : 0;
- * remainder = (remainder << 1) ^ multiple;
- * }
- * With this optimization, the little-endian code is simpler:
- * for (i = 0; i < input_bits; i++) {
- * remainder ^= next_input_bit();
- * multiple = (remainder & 1) ? CRCPOLY : 0;
- * remainder = (remainder >> 1) ^ multiple;
- * }
- *
- * Note that the other details of endianness have been hidden in CRCPOLY
- * (which must be bit-reversed) and next_input_bit().
- *
- * However, as long as next_input_bit is returning the bits in a sensible
- * order, we can actually do the merging 8 or more bits at a time rather
- * than one bit at a time:
- * for (i = 0; i < input_bytes; i++) {
- * remainder ^= next_input_byte() << 24;
- * for (j = 0; j < 8; j++) {
- * multiple = (remainder & 0x80000000) ? CRCPOLY : 0;
- * remainder = (remainder << 1) ^ multiple;
- * }
- * }
- * Or in little-endian:
- * for (i = 0; i < input_bytes; i++) {
- * remainder ^= next_input_byte();
- * for (j = 0; j < 8; j++) {
- * multiple = (remainder & 1) ? CRCPOLY : 0;
- * remainder = (remainder << 1) ^ multiple;
- * }
- * }
- * If the input is a multiple of 32 bits, you can even XOR in a 32-bit
- * word at a time and increase the inner loop count to 32.
- *
- * You can also mix and match the two loop styles, for example doing the
- * bulk of a message byte-at-a-time and adding bit-at-a-time processing
- * for any fractional bytes at the end.
- *
- * The only remaining optimization is to the byte-at-a-time table method.
- * Here, rather than just shifting one bit of the remainder to decide
- * in the correct multiple to subtract, we can shift a byte at a time.
- * This produces a 40-bit (rather than a 33-bit) intermediate remainder,
- * but again the multiple of the polynomial to subtract depends only on
- * the high bits, the high 8 bits in this case. - *
- * The multiple we need in that case is the low 32 bits of a 40-bit
- * value whose high 8 bits are given, and which is a multiple of the
- * generator polynomial. This is simply the CRC-32 of the given
- * one-byte message.
- *
- * Two more details: normally, appending zero bits to a message which
- * is already a multiple of a polynomial produces a larger multiple of that
- * polynomial. To enable a CRC to detect this condition, it's common to
- * invert the CRC before appending it. This makes the remainder of the
- * message+crc come out not as zero, but some fixed non-zero value.
- *
- * The same problem applies to zero bits prepended to the message, and
- * a similar solution is used. Instead of starting with a remainder of
- * 0, an initial remainder of all ones is used. As long as you start
- * the same way on decoding, it doesn't make a difference.
- */
-
#ifdef UNITTEST
#include <stdlib.h>
Index: infiniband/Documentation/crc32.txt
===================================================================
--- /dev/null
+++ infiniband/Documentation/crc32.txt
@@ -0,0 +1,183 @@
+A brief CRC tutorial.
+
+A CRC is a long-division remainder. You add the CRC to the message,
+and the whole thing (message+CRC) is a multiple of the given
+CRC polynomial. To check the CRC, you can either check that the
+CRC matches the recomputed value, *or* you can check that the
+remainder computed on the message+CRC is 0. This latter approach
+is used by a lot of hardware implementations, and is why so many
+protocols put the end-of-frame flag after the CRC.
+
+It's actually the same long division you learned in school, except that
+- We're working in binary, so the digits are only 0 and 1, and
+- When dividing polynomials, there are no carries. Rather than add and
+ subtract, we just xor. Thus, we tend to get a bit sloppy about
+ the difference between adding and subtracting.
+
+Like all division, the remainder is always smaller than the divisor.
+To produce a 32-bit CRC, the divisor is actually a 33-bit CRC polynomial.
+Since it's 33 bits long, bit 32 is always going to be set, so usually the
+CRC is written in hex with the most significant bit omitted. (If you're
+familiar with the IEEE 754 floating-point format, it's the same idea.)
+
+Note that a CRC is computed over a string of *bits*, so you have
+to decide on the endianness of the bits within each byte. To get
+the best error-detecting properties, this should correspond to the
+order they're actually sent. For example, standard RS-232 serial is
+little-endian; the most significant bit (sometimes used for parity)
+is sent last. And when appending a CRC word to a message, you should
+do it in the right order, matching the endianness.
+
+Just like with ordinary division, you proceed one digit (bit) at a time.
+Each step of the division, division, you take one more digit (bit) of the
+dividend and append it to the current remainder. Then you figure out the
+appropriate multiple of the divisor to subtract to being the remainder
+back into range. In binary, this is easy - it has to be either 0 or 1,
+and to make the XOR cancel, it's just a copy of bit 32 of the remainder.
+
+When computing a CRC, we don't care about the quotient, so we can
+throw the quotient bit away, but subtract the appropriate multiple of
+the polynomial from the remainder and we're back to where we started,
+ready to process the next bit.
+
+A big-endian CRC written this way would be coded like:
+for (i = 0; i < input_bits; i++) {
+ multiple = remainder & 0x80000000 ? CRCPOLY : 0;
+ remainder = (remainder << 1 | next_input_bit()) ^ multiple;
+}
+
+Notice how, to get at bit 32 of the shifted remainder, we look
+at bit 31 of the remainder *before* shifting it.
+
+But also notice how the next_input_bit() bits we're shifting into
+the remainder don't actually affect any decision-making until
+32 bits later. Thus, the first 32 cycles of this are pretty boring.
+Also, to add the CRC to a message, we need a 32-bit-long hole for it at
+the end, so we have to add 32 extra cycles shifting in zeros at the
+end of every message,
+
+These details lead to a standard trick: rearrange merging in the
+next_input_bit() until the moment it's needed. Then the first 32 cycles
+can be precomputed, and merging in the final 32 zero bits to make room
+for the CRC can be skipped entirely. This changes the code to:
+
+for (i = 0; i < input_bits; i++) {
+ remainder ^= next_input_bit() << 31;
+ multiple = (remainder & 0x80000000) ? CRCPOLY : 0;
+ remainder = (remainder << 1) ^ multiple;
+}
+
+With this optimization, the little-endian code is particularly simple:
+for (i = 0; i < input_bits; i++) {
+ remainder ^= next_input_bit();
+ multiple = (remainder & 1) ? CRCPOLY : 0;
+ remainder = (remainder >> 1) ^ multiple;
+}
+
+The most significant coefficient of the remainder polynomial is stored
+in the least significant bit of the binary "remainder" variable.
+The other details of endianness have been hidden in CRCPOLY (which must
+be bit-reversed) and next_input_bit().
+
+As long as next_input_bit is returning the bits in a sensible order, we don't
+*have* to wait until the last possible moment to merge in additional bits.
+We can do it 8 bits at a time rather than 1 bit at a time:
+for (i = 0; i < input_bytes; i++) {
+ remainder ^= next_input_byte() << 24;
+ for (j = 0; j < 8; j++) {
+ multiple = (remainder & 0x80000000) ? CRCPOLY : 0;
+ remainder = (remainder << 1) ^ multiple;
+ }
+}
+
+Or in little-endian:
+for (i = 0; i < input_bytes; i++) {
+ remainder ^= next_input_byte();
+ for (j = 0; j < 8; j++) {
+ multiple = (remainder & 1) ? CRCPOLY : 0;
+ remainder = (remainder >> 1) ^ multiple;
+ }
+}
+
+If the input is a multiple of 32 bits, you can even XOR in a 32-bit
+word at a time and increase the inner loop count to 32.
+
+You can also mix and match the two loop styles, for example doing the
+bulk of a message byte-at-a-time and adding bit-at-a-time processing
+for any fractional bytes at the end.
+
+To reduce the number of conditional branches, software commonly uses
+the byte-at-a-time table method, popularized by Dilip V. Sarwate,
+"Computation of Cyclic Redundancy Checks via Table Look-Up", Comm. ACM
+v.31 no.8 (August 1998) p. 1008-1013.
+
+Here, rather than just shifting one bit of the remainder to decide
+in the correct multiple to subtract, we can shift a byte at a time.
+This produces a 40-bit (rather than a 33-bit) intermediate remainder,
+and the correct multiple of the polynomial to subtract is found using
+a 256-entry lookup table indexed by the high 8 bits.
+
+(The table entries are simply the CRC-32 of the given one-byte messages.)
+
+When space is more constrained, smaller tables can be used, e.g. two
+4-bit shifts followed by a lookup in a 16-entry table.
+
+It is not practical to process much more than 8 bits at a time using this
+technique, because tables larger than 256 entries use too much memory and,
+more importantly, too much of the L1 cache.
+
+To get higher software performance, a "slicing" technique can be used.
+See "High Octane CRC Generation with the Intel Slicing-by-8 Algorithm",
+ftp://download.intel.com/technology/comms/perfnet/download/slicing-by-8.pdf
+
+This does not change the number of table lookups, but does increase
+the parallelism. With the classic Sarwate algorithm, each table lookup
+must be completed before the index of the next can be computed.
+
+A "slicing by 2" technique would shift the remainder 16 bits at a time,
+producing a 48-bit intermediate remainder. Rather than doing a single
+lookup in a 65536-entry table, the two high bytes are looked up in
+two different 256-entry tables. Each contains the remainder required
+to cancel out the corresponding byte. The tables are different because the
+polynomials to cancel are different. One has non-zero coefficients from
+x^32 to x^39, while the other goes from x^40 to x^47.
+
+Since modern processors can handle many parallel memory operations, this
+takes barely longer than a single table look-up and thus performs almost
+twice as fast as the basic Sarwate algorithm.
+
+This can be extended to "slicing by 4" using 4 256-entry tables.
+Each step, 32 bits of data is fetched, XORed with the CRC, and the result
+broken into bytes and looked up in the tables. Because the 32-bit shift
+leaves the low-order bits of the intermediate remainder zero, the
+final CRC is simply the XOR of the 4 table look-ups.
+
+But this still enforces sequential execution: a second group of table
+look-ups cannot begin until the previous groups 4 table look-ups have all
+been completed. Thus, the processor's load/store unit is sometimes idle.
+
+To make maximum use of the processor, "slicing by 8" performs 8 look-ups
+in parallel. Each step, the 32-bit CRC is shifted 64 bits and XORed
+with 64 bits of input data. What is important to note is that 4 of
+those 8 bytes are simply copies of the input data; they do not depend
+on the previous CRC at all. Thus, those 4 table look-ups may commence
+immediately, without waiting for the previous loop iteration.
+
+By always having 4 loads in flight, a modern superscalar processor can
+be kept busy and make full use of its L1 cache.
+
+Two more details about CRC implementation in the real world:
+
+Normally, appending zero bits to a message which is already a multiple
+of a polynomial produces a larger multiple of that polynomial. Thus,
+a basic CRC will not detect appended zero bits (or bytes). To enable
+a CRC to detect this condition, it's common to invert the CRC before
+appending it. This makes the remainder of the message+crc come out not
+as zero, but some fixed non-zero value. (The CRC of the inversion
+pattern, 0xffffffff.)
+
+The same problem applies to zero bits prepended to the message, and a
+similar solution is used. Instead of starting the CRC computation with
+a remainder of 0, an initial remainder of all ones is used. As long as
+you start the same way on decoding, it doesn't make a difference.
+
Index: infiniband/Documentation/00-INDEX
===================================================================
--- infiniband.orig/Documentation/00-INDEX
+++ infiniband/Documentation/00-INDEX
@@ -104,6 +104,8 @@ cpuidle/
- info on CPU_IDLE, CPU idle state management subsystem.
cputopology.txt
- documentation on how CPU topology info is exported via sysfs.
+crc32.txt
+ - brief tutorial on CRC computation
cris/
- directory with info about Linux on CRIS architecture.
crypto/
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 3/8] crc32-replace-self-test.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
2011-08-10 22:43 ` [patch v5 1/8] crc32-add-pointer-to-tab.diff Bob Pearson
2011-08-10 22:43 ` [patch v5 2/8] crc32-move-to-documentation.diff Bob Pearson
@ 2011-08-10 22:44 ` Bob Pearson
2011-08-10 22:44 ` [patch v5 4/8] crc32-misc-cleanup.diff Bob Pearson
` (4 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:44 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
Replaced the unit test provided in crc32.c, which doesn't have a
makefile and doesn't compile with current headers, with a simpler
self test routine that also gives a measure of performance and
runs at module init time. The self test option can be enabled
through a configuration option CONFIG_CRC32_SELFTEST.
The test stresses the pre and post loops and is thus not very
realistic since actual uses will likely have addresses and lengths
that are at least 4 byte aligned. The typical main loop is long
enough so that the performance is dominated by that loop.
The expected values for crc32_le and crc32_be were generated
with the previous version of crc32.c using CRC_BITS_LE = 32 and
CRC_BITS_BE = 32. These values were then used to check all the
values of the BITS parameters.
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/Kconfig | 10 lib/crc32.c | 794 +++++++++++++++++++++++++++++++++++++++++++++++++++---------
2 files changed, 689 insertions(+), 115 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -209,137 +209,701 @@ u32 __pure crc32_be(u32 crc, unsigned ch
EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(crc32_be);
-#ifdef UNITTEST
+#ifdef CONFIG_CRC32_SELFTEST
-#include <stdlib.h>
-#include <stdio.h>
-
-#if 0 /*Not used at present */
-static void
-buf_dump(char const *prefix, unsigned char const *buf, size_t len)
+/* 4096 random bytes */
+static u8 __attribute__((__aligned__(8))) test_buf[] =
{
- fputs(prefix, stdout);
- while (len--)
- printf(" %02x", *buf++);
- putchar('\n');
-
-}
-#endif
-
-static void bytereverse(unsigned char *buf, size_t len)
+ 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
+ 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
+ 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
+ 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
+ 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
+ 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
+ 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
+ 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
+ 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
+ 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
+ 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
+ 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
+ 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
+ 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
+ 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
+ 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
+ 0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
+ 0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
+ 0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
+ 0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
+ 0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
+ 0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
+ 0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
+ 0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
+ 0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
+ 0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
+ 0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
+ 0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
+ 0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
+ 0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
+ 0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
+ 0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
+ 0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
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+ 0x3c, 0xa4, 0xe0, 0x9b, 0xd1, 0x90, 0xbc, 0x38,
+ 0x6c, 0xdd, 0x95, 0x4d, 0x9d, 0xb1, 0x71, 0x57,
+ 0x2d, 0x34, 0xe8, 0xb8, 0x42, 0xc7, 0x99, 0x03,
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+ 0xac, 0x39, 0x94, 0x3c, 0x10, 0xc6, 0x29, 0x73,
+ 0x0e, 0x0e, 0x5d, 0xe0, 0x71, 0x03, 0x8a, 0x72,
+ 0x0e, 0x26, 0xb0, 0x7d, 0x84, 0xed, 0x95, 0x23,
+ 0x49, 0x5a, 0x45, 0x83, 0x45, 0x60, 0x11, 0x4a,
+ 0x46, 0x31, 0xd4, 0xd8, 0x16, 0x54, 0x98, 0x58,
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+ 0xf5, 0xa6, 0x36, 0x94, 0xfd, 0x84, 0xce, 0x1c,
+ 0x0f, 0x4b, 0xd0, 0xc2, 0x5b, 0x6b, 0x56, 0xef,
+ 0x73, 0x93, 0x0b, 0xc3, 0xee, 0xd9, 0xcf, 0xd3,
+ 0xa4, 0x22, 0x58, 0xcd, 0x50, 0x6e, 0x65, 0xf4,
+ 0xe9, 0xb7, 0x71, 0xaf, 0x4b, 0xb3, 0xb6, 0x2f,
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+ 0x22, 0x2b, 0xac, 0x12, 0x32, 0x28, 0x91, 0xd8,
+ 0xa5, 0xab, 0xff, 0x5f, 0xe0, 0x4b, 0xda, 0x78,
+ 0x17, 0xda, 0xf1, 0x01, 0x5b, 0xcd, 0xe2, 0x5f,
+ 0x50, 0x45, 0x73, 0x2b, 0xe4, 0x76, 0x77, 0xf4,
+ 0x64, 0x1d, 0x43, 0xfb, 0x84, 0x7a, 0xea, 0x91,
+ 0xae, 0xf9, 0x9e, 0xb7, 0xb4, 0xb0, 0x91, 0x5f,
+ 0x16, 0x35, 0x9a, 0x11, 0xb8, 0xc7, 0xc1, 0x8c,
+ 0xc6, 0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57,
+ 0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4,
+ 0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23,
+ 0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17,
+ 0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66,
+ 0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39,
+ 0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36,
+ 0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00,
+ 0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7,
+ 0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60,
+ 0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c,
+ 0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
+ 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
+ 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
+ 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
+ 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
+ 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
+ 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
+ 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
+ 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
+ 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
+ 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
+ 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
+ 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
+ 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
+ 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
+ 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
+ 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
+ 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
+ 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
+ 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
+ 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
+ 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
+ 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
+};
+
+/* 100 test cases */
+static struct crc_test {
+ u32 crc; /* random starting crc */
+ u32 start; /* random 6 bit offset in buf */
+ u32 length; /* random 11 bit length of test */
+ u32 crc_le; /* expected crc32_le result */
+ u32 crc_be; /* expected crc32_be result */
+} test[] =
{
- while (len--) {
- unsigned char x = bitrev8(*buf);
- *buf++ = x;
- }
-}
+ {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1},
+ {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad},
+ {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f},
+ {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a},
+ {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2},
+ {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793},
+ {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed},
+ {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35},
+ {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2},
+ {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10},
+ {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb},
+ {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0},
+ {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb},
+ {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed},
+ {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591},
+ {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67},
+ {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd},
+ {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a},
+ {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b},
+ {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f},
+ {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d},
+ {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a},
+ {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97},
+ {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2},
+ {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138},
+ {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032},
+ {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f},
+ {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f},
+ {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32},
+ {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef},
+ {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0},
+ {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59},
+ {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4},
+ {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c},
+ {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51},
+ {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11},
+ {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659},
+ {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af},
+ {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99},
+ {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b},
+ {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521},
+ {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3},
+ {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d},
+ {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f},
+ {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b},
+ {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0},
+ {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195},
+ {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d},
+ {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4},
+ {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3},
+ {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643},
+ {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10},
+ {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d},
+ {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5},
+ {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b},
+ {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee},
+ {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14},
+ {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a},
+ {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b},
+ {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3},
+ {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826},
+ {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06},
+ {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35},
+ {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801},
+ {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2},
+ {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d},
+ {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c},
+ {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba},
+ {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5},
+ {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b},
+ {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178},
+ {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3},
+ {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605},
+ {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1},
+ {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9},
+ {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78},
+ {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9},
+ {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd},
+ {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab},
+ {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb},
+ {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77},
+ {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da},
+ {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39},
+ {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16},
+ {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208},
+ {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e},
+ {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5},
+ {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892},
+ {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db},
+ {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43},
+ {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac},
+ {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7},
+ {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2},
+ {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2},
+ {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640},
+ {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f},
+ {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99},
+ {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7},
+ {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499},
+ {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a},
+};
-static void random_garbage(unsigned char *buf, size_t len)
-{
- while (len--)
- *buf++ = (unsigned char) random();
-}
+#include <linux/time.h>
-#if 0 /* Not used at present */
-static void store_le(u32 x, unsigned char *buf)
+static int __init crc32_init(void)
{
- buf[0] = (unsigned char) x;
- buf[1] = (unsigned char) (x >> 8);
- buf[2] = (unsigned char) (x >> 16);
- buf[3] = (unsigned char) (x >> 24);
-}
-#endif
+ int i;
+ int errors = 0;
+ int bytes = 0;
+ struct timespec start, stop;
+ u64 nsec;
+ unsigned long flags;
+
+ /* keep static to prevent cache warming code from
+ * getting eliminated by the compiler */
+ static u32 crc;
+
+ /* pre-warm the cache */
+ for (i = 0; i < 100; i++) {
+ bytes += 2*test[i].length;
-static void store_be(u32 x, unsigned char *buf)
-{
- buf[0] = (unsigned char) (x >> 24);
- buf[1] = (unsigned char) (x >> 16);
- buf[2] = (unsigned char) (x >> 8);
- buf[3] = (unsigned char) x;
-}
+ crc ^= crc32_le(test[i].crc, test_buf +
+ test[i].start, test[i].length);
-/*
- * This checks that CRC(buf + CRC(buf)) = 0, and that
- * CRC commutes with bit-reversal. This has the side effect
- * of bytewise bit-reversing the input buffer, and returns
- * the CRC of the reversed buffer.
- */
-static u32 test_step(u32 init, unsigned char *buf, size_t len)
-{
- u32 crc1, crc2;
- size_t i;
+ crc ^= crc32_be(test[i].crc, test_buf +
+ test[i].start, test[i].length);
+ }
- crc1 = crc32_be(init, buf, len);
- store_be(crc1, buf + len);
- crc2 = crc32_be(init, buf, len + 4);
- if (crc2)
- printf("\nCRC cancellation fail: 0x%08x should be 0\n",
- crc2);
-
- for (i = 0; i <= len + 4; i++) {
- crc2 = crc32_be(init, buf, i);
- crc2 = crc32_be(crc2, buf + i, len + 4 - i);
- if (crc2)
- printf("\nCRC split fail: 0x%08x\n", crc2);
+ /* reduce OS noise */
+ local_irq_save(flags);
+ local_irq_disable();
+
+ getnstimeofday(&start);
+ for (i = 0; i < 100; i++) {
+ if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
+ test[i].start, test[i].length))
+ errors++;
+
+ if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
+ test[i].start, test[i].length))
+ errors++;
}
+ getnstimeofday(&stop);
+
+ local_irq_restore(flags);
+ local_irq_enable();
- /* Now swap it around for the other test */
+ nsec = stop.tv_nsec - start.tv_nsec +
+ 1000000000 * (stop.tv_sec - start.tv_sec);
- bytereverse(buf, len + 4);
- init = bitrev32(init);
- crc2 = bitrev32(crc1);
- if (crc1 != bitrev32(crc2))
- printf("\nBit reversal fail: 0x%08x -> 0x%08x -> 0x%08x\n",
- crc1, crc2, bitrev32(crc2));
- crc1 = crc32_le(init, buf, len);
- if (crc1 != crc2)
- printf("\nCRC endianness fail: 0x%08x != 0x%08x\n", crc1,
- crc2);
- crc2 = crc32_le(init, buf, len + 4);
- if (crc2)
- printf("\nCRC cancellation fail: 0x%08x should be 0\n",
- crc2);
-
- for (i = 0; i <= len + 4; i++) {
- crc2 = crc32_le(init, buf, i);
- crc2 = crc32_le(crc2, buf + i, len + 4 - i);
- if (crc2)
- printf("\nCRC split fail: 0x%08x\n", crc2);
+ pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
+ CRC_LE_BITS, CRC_BE_BITS);
+
+ if (errors)
+ pr_warn("crc32: %d self tests failed\n", errors);
+ else {
+ pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
+ bytes, nsec);
}
- return crc1;
+ return 0;
}
-#define SIZE 64
-#define INIT1 0
-#define INIT2 0
-
-int main(void)
+static void __exit crc32_exit(void)
{
- unsigned char buf1[SIZE + 4];
- unsigned char buf2[SIZE + 4];
- unsigned char buf3[SIZE + 4];
- int i, j;
- u32 crc1, crc2, crc3;
-
- for (i = 0; i <= SIZE; i++) {
- printf("\rTesting length %d...", i);
- fflush(stdout);
- random_garbage(buf1, i);
- random_garbage(buf2, i);
- for (j = 0; j < i; j++)
- buf3[j] = buf1[j] ^ buf2[j];
-
- crc1 = test_step(INIT1, buf1, i);
- crc2 = test_step(INIT2, buf2, i);
- /* Now check that CRC(buf1 ^ buf2) = CRC(buf1) ^ CRC(buf2) */
- crc3 = test_step(INIT1 ^ INIT2, buf3, i);
- if (crc3 != (crc1 ^ crc2))
- printf("CRC XOR fail: 0x%08x != 0x%08x ^ 0x%08x\n",
- crc3, crc1, crc2);
- }
- printf("\nAll test complete. No failures expected.\n");
- return 0;
}
-#endif /* UNITTEST */
+module_init(crc32_init);
+module_exit(crc32_exit);
+#endif /* CONFIG_CRC32_SELFTEST */
Index: infiniband/lib/Kconfig
===================================================================
--- infiniband.orig/lib/Kconfig
+++ infiniband/lib/Kconfig
@@ -60,6 +60,16 @@ config CRC32
kernel tree does. Such modules that use library CRC32 functions
require M here.
+config CRC32_SELFTEST
+ bool "CRC32 perform self test on init"
+ default n
+ depends on CRC32
+ help
+ This option enables the CRC32 library functions to perform a
+ self test on initialization. The self test computes crc32_le
+ and crc32_be over byte strings with random alignment and length
+ and computes the total elapsed time and number of bytes processed.
+
config CRC7
tristate "CRC7 functions"
help
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 4/8] crc32-misc-cleanup.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
` (2 preceding siblings ...)
2011-08-10 22:44 ` [patch v5 3/8] crc32-replace-self-test.diff Bob Pearson
@ 2011-08-10 22:44 ` Bob Pearson
2011-08-10 22:44 ` [patch v5 5/8] crc32-fix-check-endian-warnings.diff Bob Pearson
` (3 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:44 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
Misc cleanup of lib/crc32.c
- removed unnecessary header files. If it passes sparse without
it I took it out.
- straightened out some convoluted ifdef's
- code incorrectly referenced 2D crc32table_le table as
crc32table_l(b)e[x] instead of crc32table_l(b)e[0][x] for
BITS = 2 & 4. This failed sparse.
- a few trivial whitespace changes
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 104 ++++++++++++++++++++----------------------------------------
1 file changed, 36 insertions(+), 68 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -21,13 +21,10 @@
*/
#include <linux/crc32.h>
-#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/compiler.h>
#include <linux/types.h>
-#include <linux/init.h>
-#include <asm/atomic.h>
#include "crc32defs.h"
+
#if CRC_LE_BITS == 8
# define tole(x) __constant_cpu_to_le32(x)
#else
@@ -39,6 +36,7 @@
#else
# define tobe(x) (x)
#endif
+
#include "crc32table.h"
MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
@@ -94,6 +92,7 @@ crc32_body(u32 crc, unsigned char const #undef DO_CRC4
}
#endif
+
/**
* crc32_le() - Calculate bitwise little-endian Ethernet AUTODIN II CRC32
* @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
@@ -101,53 +100,39 @@ crc32_body(u32 crc, unsigned char const * @p: pointer to buffer over which CRC is run
* @len: length of buffer @p
*/
-u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len);
-
-#if CRC_LE_BITS == 1
-/*
- * In fact, the table-based code will work in this case, but it can be
- * simplified by inlining the table in ?: form.
- */
-
u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
{
+#if CRC_LE_BITS == 1
int i;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
- return crc;
-}
-#else /* Table-based approach */
-
-u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
-{
-# if CRC_LE_BITS == 8
- const u32 (*tab)[] = crc32table_le;
-
- crc = __cpu_to_le32(crc);
- crc = crc32_body(crc, p, len, tab);
- return __le32_to_cpu(crc);
-# elif CRC_LE_BITS == 4
+# elif CRC_LE_BITS == 2
while (len--) {
crc ^= *p++;
- crc = (crc >> 4) ^ crc32table_le[crc & 15];
- crc = (crc >> 4) ^ crc32table_le[crc & 15];
+ crc = (crc >> 2) ^ crc32table_le[0][crc & 3];
+ crc = (crc >> 2) ^ crc32table_le[0][crc & 3];
+ crc = (crc >> 2) ^ crc32table_le[0][crc & 3];
+ crc = (crc >> 2) ^ crc32table_le[0][crc & 3];
}
- return crc;
-# elif CRC_LE_BITS == 2
+# elif CRC_LE_BITS == 4
while (len--) {
crc ^= *p++;
- crc = (crc >> 2) ^ crc32table_le[crc & 3];
- crc = (crc >> 2) ^ crc32table_le[crc & 3];
- crc = (crc >> 2) ^ crc32table_le[crc & 3];
- crc = (crc >> 2) ^ crc32table_le[crc & 3];
+ crc = (crc >> 4) ^ crc32table_le[0][crc & 15];
+ crc = (crc >> 4) ^ crc32table_le[0][crc & 15];
}
+# elif CRC_LE_BITS == 8
+ const u32 (*tab)[] = crc32table_le;
+
+ crc = __cpu_to_le32(crc);
+ crc = crc32_body(crc, p, len, tab);
+ crc = __le32_to_cpu(crc);
+#endif
return crc;
-# endif
}
-#endif
+EXPORT_SYMBOL(crc32_le);
/**
* crc32_be() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
@@ -156,16 +141,9 @@ u32 __pure crc32_le(u32 crc, unsigned ch
* @p: pointer to buffer over which CRC is run
* @len: length of buffer @p
*/
-u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len);
-
-#if CRC_BE_BITS == 1
-/*
- * In fact, the table-based code will work in this case, but it can be
- * simplified by inlining the table in ?: form.
- */
-
u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
{
+#if CRC_BE_BITS == 1
int i;
while (len--) {
crc ^= *p++ << 24;
@@ -174,39 +152,29 @@ u32 __pure crc32_be(u32 crc, unsigned ch
(crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE :
0);
}
- return crc;
-}
-
-#else /* Table-based approach */
-u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
-{
-# if CRC_BE_BITS == 8
- const u32 (*tab)[] = crc32table_be;
-
- crc = __cpu_to_be32(crc);
- crc = crc32_body(crc, p, len, tab);
- return __be32_to_cpu(crc);
-# elif CRC_BE_BITS == 4
+# elif CRC_BE_BITS == 2
while (len--) {
crc ^= *p++ << 24;
- crc = (crc << 4) ^ crc32table_be[crc >> 28];
- crc = (crc << 4) ^ crc32table_be[crc >> 28];
+ crc = (crc << 2) ^ crc32table_be[0][crc >> 30];
+ crc = (crc << 2) ^ crc32table_be[0][crc >> 30];
+ crc = (crc << 2) ^ crc32table_be[0][crc >> 30];
+ crc = (crc << 2) ^ crc32table_be[0][crc >> 30];
}
- return crc;
-# elif CRC_BE_BITS == 2
+# elif CRC_BE_BITS == 4
while (len--) {
crc ^= *p++ << 24;
- crc = (crc << 2) ^ crc32table_be[crc >> 30];
- crc = (crc << 2) ^ crc32table_be[crc >> 30];
- crc = (crc << 2) ^ crc32table_be[crc >> 30];
- crc = (crc << 2) ^ crc32table_be[crc >> 30];
+ crc = (crc << 4) ^ crc32table_be[0][crc >> 28];
+ crc = (crc << 4) ^ crc32table_be[0][crc >> 28];
}
- return crc;
+# elif CRC_BE_BITS == 8
+ const u32 (*tab)[] = crc32table_be;
+
+ crc = __cpu_to_be32(crc);
+ crc = crc32_body(crc, p, len, tab);
+ crc = __be32_to_cpu(crc);
# endif
+ return crc;
}
-#endif
-
-EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(crc32_be);
#ifdef CONFIG_CRC32_SELFTEST
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 5/8] crc32-fix-check-endian-warnings.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
` (3 preceding siblings ...)
2011-08-10 22:44 ` [patch v5 4/8] crc32-misc-cleanup.diff Bob Pearson
@ 2011-08-10 22:44 ` Bob Pearson
2011-08-10 22:44 ` [patch v5 6/8] crc32-add-real-8-bit.diff Bob Pearson
` (2 subsequent siblings)
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:44 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
crc32.c freely mixes u32, __le32 and __be32 types. Fix warnings from
sparse with "-D__CHECK_ENDIAN__" by some emphatic casts.
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -26,13 +26,13 @@
#include "crc32defs.h"
#if CRC_LE_BITS == 8
-# define tole(x) __constant_cpu_to_le32(x)
+# define tole(x) (__force u32) __constant_cpu_to_le32(x)
#else
# define tole(x) (x)
#endif
#if CRC_BE_BITS == 8
-# define tobe(x) __constant_cpu_to_be32(x)
+# define tobe(x) (__force u32) __constant_cpu_to_be32(x)
#else
# define tobe(x) (x)
#endif
@@ -126,9 +126,9 @@ u32 __pure crc32_le(u32 crc, unsigned ch
# elif CRC_LE_BITS == 8
const u32 (*tab)[] = crc32table_le;
- crc = __cpu_to_le32(crc);
+ crc = (__force u32) __cpu_to_le32(crc);
crc = crc32_body(crc, p, len, tab);
- crc = __le32_to_cpu(crc);
+ crc = __le32_to_cpu((__force __le32)crc);
#endif
return crc;
}
@@ -169,9 +169,9 @@ u32 __pure crc32_be(u32 crc, unsigned ch
# elif CRC_BE_BITS == 8
const u32 (*tab)[] = crc32table_be;
- crc = __cpu_to_be32(crc);
+ crc = (__force u32) __cpu_to_be32(crc);
crc = crc32_body(crc, p, len, tab);
- crc = __be32_to_cpu(crc);
+ crc = __be32_to_cpu((__force __be32)crc);
# endif
return crc;
}
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 6/8] crc32-add-real-8-bit.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
` (4 preceding siblings ...)
2011-08-10 22:44 ` [patch v5 5/8] crc32-fix-check-endian-warnings.diff Bob Pearson
@ 2011-08-10 22:44 ` Bob Pearson
2011-08-10 22:44 ` [patch v5 7/8] crc32-add-slicing-by-8.diff Bob Pearson
2011-08-10 22:45 ` [patch v5 8/8] crc32-final-cleanup.diff Bob Pearson
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:44 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
crc32.c encodes an algorithm that processes 32 bits at a time
with the value BITS = 8 and leaves out the most common 8 bit algorithm
for computing the crc. This patch reencodes the 32 bit algorithm
with the value 32 and adds back the 'standard' 8 bit algorithm.
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 17 ++++++++++++++---
lib/crc32defs.h | 18 ++++++++++--------
lib/gen_crc32table.c | 15 ++++++++++++---
3 files changed, 36 insertions(+), 14 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -25,13 +25,13 @@
#include <linux/types.h>
#include "crc32defs.h"
-#if CRC_LE_BITS == 8
+#if CRC_LE_BITS > 8
# define tole(x) (__force u32) __constant_cpu_to_le32(x)
#else
# define tole(x) (x)
#endif
-#if CRC_BE_BITS == 8
+#if CRC_BE_BITS > 8
# define tobe(x) (__force u32) __constant_cpu_to_be32(x)
#else
# define tobe(x) (x)
@@ -43,7 +43,7 @@ MODULE_AUTHOR("Matt Domsch <Matt_Domsch@
MODULE_DESCRIPTION("Ethernet CRC32 calculations");
MODULE_LICENSE("GPL");
-#if CRC_LE_BITS == 8 || CRC_BE_BITS == 8
+#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
static inline u32
crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
@@ -124,6 +124,12 @@ u32 __pure crc32_le(u32 crc, unsigned ch
crc = (crc >> 4) ^ crc32table_le[0][crc & 15];
}
# elif CRC_LE_BITS == 8
+ /* aka Sarwate algorithm */
+ while (len--) {
+ crc ^= *p++;
+ crc = (crc >> 8) ^ crc32table_le[0][crc & 255];
+ }
+# else
const u32 (*tab)[] = crc32table_le;
crc = (__force u32) __cpu_to_le32(crc);
@@ -167,6 +173,11 @@ u32 __pure crc32_be(u32 crc, unsigned ch
crc = (crc << 4) ^ crc32table_be[0][crc >> 28];
}
# elif CRC_BE_BITS == 8
+ while (len--) {
+ crc ^= *p++ << 24;
+ crc = (crc << 8) ^ crc32table_be[0][crc >> 24];
+ }
+# else
const u32 (*tab)[] = crc32table_be;
crc = (__force u32) __cpu_to_be32(crc);
Index: infiniband/lib/crc32defs.h
===================================================================
--- infiniband.orig/lib/crc32defs.h
+++ infiniband/lib/crc32defs.h
@@ -6,27 +6,29 @@
#define CRCPOLY_LE 0xedb88320
#define CRCPOLY_BE 0x04c11db7
-/* How many bits at a time to use. Requires a table of 4<<CRC_xx_BITS bytes. */
-/* For less performance-sensitive, use 4 */
+/* How many bits at a time to use. Valid values are 1, 2, 4, 8, and 32. */
+/* For less performance-sensitive, use 4 or 8 */
#ifndef CRC_LE_BITS -# define CRC_LE_BITS 8
+# define CRC_LE_BITS 32
#endif
#ifndef CRC_BE_BITS
-# define CRC_BE_BITS 8
+# define CRC_BE_BITS 32
#endif
/*
* Little-endian CRC computation. Used with serial bit streams sent
* lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC.
*/
-#if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1
-# error CRC_LE_BITS must be a power of 2 between 1 and 8
+#if CRC_LE_BITS > 32 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
+ CRC_LE_BITS & CRC_LE_BITS-1
+# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32}"
#endif
/*
* Big-endian CRC computation. Used with serial bit streams sent
* msbit-first. Be sure to use cpu_to_be32() to append the computed CRC.
*/
-#if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1
-# error CRC_BE_BITS must be a power of 2 between 1 and 8
+#if CRC_BE_BITS > 32 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
+ CRC_BE_BITS & CRC_BE_BITS-1
+# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32}"
#endif
Index: infiniband/lib/gen_crc32table.c
===================================================================
--- infiniband.orig/lib/gen_crc32table.c
+++ infiniband/lib/gen_crc32table.c
@@ -4,11 +4,20 @@
#define ENTRIES_PER_LINE 4
+#if CRC_LE_BITS <= 8
#define LE_TABLE_SIZE (1 << CRC_LE_BITS)
+#else
+#define LE_TABLE_SIZE 256
+#endif
+
+#if CRC_BE_BITS <= 8
#define BE_TABLE_SIZE (1 << CRC_BE_BITS)
+#else
+#define BE_TABLE_SIZE 256
+#endif
-static uint32_t crc32table_le[4][LE_TABLE_SIZE];
-static uint32_t crc32table_be[4][BE_TABLE_SIZE];
+static uint32_t crc32table_le[4][256];
+static uint32_t crc32table_be[4][256];
/**
* crc32init_le() - allocate and initialize LE table data
@@ -24,7 +33,7 @@ static void crc32init_le(void)
crc32table_le[0][0] = 0;
- for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) {
+ for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
crc32table_le[0][i + j] = crc ^ crc32table_le[0][j];
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 7/8] crc32-add-slicing-by-8.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
` (5 preceding siblings ...)
2011-08-10 22:44 ` [patch v5 6/8] crc32-add-real-8-bit.diff Bob Pearson
@ 2011-08-10 22:44 ` Bob Pearson
2011-08-11 13:46 ` Joakim Tjernlund
2011-08-11 15:34 ` George Spelvin
2011-08-10 22:45 ` [patch v5 8/8] crc32-final-cleanup.diff Bob Pearson
7 siblings, 2 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:44 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
extend add slicing-by-8 algorithm to the existing
slicing-by-4 algorithm. This consists of:
- extend largest BITS size from 32 to 64
- extend table from tab[4][256] to tab[8][256]
- change algorithm to align on 8 byte boundary
(it was noted that all that is really required
is that the inner loop must comsume 8 bytes.
As written it can start on even or odd 4 byte
boundary.)
- Add code for inner loop.
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 60 ++++++++++++++++++++++++++++++++++++++++++---------
lib/crc32defs.h | 14 +++++------
lib/gen_crc32table.c | 40 ++++++++++++++++++++--------------
3 files changed, 81 insertions(+), 33 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -45,6 +45,7 @@ MODULE_LICENSE("GPL");
#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
+/* implements slicing-by-4 or slicing-by-8 algorithm */
static inline u32
crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
{
@@ -54,42 +55,81 @@ crc32_body(u32 crc, unsigned char const t2[(crc >> 8) & 255] ^ \
t1[(crc >> 16) & 255] ^ \
t0[(crc >> 24) & 255]
+# define DO_CRC8a (t7[(q) & 255] ^ \
+ t6[(q >> 8) & 255] ^ \
+ t5[(q >> 16) & 255] ^ \
+ t4[(q >> 24) & 255])
+# define DO_CRC8b (t3[(q) & 255] ^ \
+ t2[(q >> 8) & 255] ^ \
+ t1[(q >> 16) & 255] ^ \
+ t0[(q >> 24) & 255])
# else
# define DO_CRC(x) (crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8))
# define DO_CRC4 crc = t0[(crc) & 255] ^ \
t1[(crc >> 8) & 255] ^ \
t2[(crc >> 16) & 255] ^ \
t3[(crc >> 24) & 255]
+# define DO_CRC8a (t4[(q) & 255] ^ \
+ t5[(q >> 8) & 255] ^ \
+ t6[(q >> 16) & 255] ^ \
+ t7[(q >> 24) & 255])
+# define DO_CRC8b (t0[(q) & 255] ^ \
+ t1[(q >> 8) & 255] ^ \
+ t2[(q >> 16) & 255] ^ \
+ t3[(q >> 24) & 255])
# endif
const u32 *b;
- size_t rem_len;
const u32 *t0 = tab[0], *t1 = tab[1], *t2 = tab[2], *t3 = tab[3];
+ const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
+ size_t init_len;
+ size_t middle_len;
+ size_t rem_len;
+
+ /* break buf into init_len bytes before and
+ * rem_len bytes after a middle section with
+ * middle_len properly aligned words
+ * note 8 byte loop need only be aligned on
+ * a 4 byte boundary */
+ init_len = min((-((uintptr_t)buf)) & 3, len);
+# if CRC_LE_BITS == 32
+ middle_len = (len - init_len) >> 2;
+ rem_len = (len - init_len) & 3;
+# else
+ middle_len = (len - init_len) >> 3;
+ rem_len = (len - init_len) & 7;
+# endif
/* Align it */
- if (unlikely((long)buf & 3 && len)) {
+ if (unlikely(init_len)) {
do {
DO_CRC(*buf++);
- } while ((--len) && ((long)buf)&3);
+ } while (--init_len);
}
- rem_len = len & 3;
- /* load data 32 bits wide, xor data 32 bits wide. */
- len = len >> 2;
b = (const u32 *)buf;
- for (--b; len; --len) {
+ for (--b; middle_len; --middle_len) {
+# if CRC_LE_BITS == 32
crc ^= *++b; /* use pre increment for speed */
DO_CRC4;
+# else
+ u32 q;
+ q = crc ^ *++b;
+ crc = DO_CRC8a;
+ q = *++b;
+ crc ^= DO_CRC8b;
+# endif
}
- len = rem_len;
/* And the last few bytes */
- if (len) {
+ if (rem_len) {
u8 *p = (u8 *)(b + 1) - 1;
do {
DO_CRC(*++p); /* use pre increment for speed */
- } while (--len);
+ } while (--rem_len);
}
return crc;
#undef DO_CRC
#undef DO_CRC4
+#undef DO_CRC8a
+#undef DO_CRC8b
}
#endif
Index: infiniband/lib/crc32defs.h
===================================================================
--- infiniband.orig/lib/crc32defs.h
+++ infiniband/lib/crc32defs.h
@@ -6,29 +6,29 @@
#define CRCPOLY_LE 0xedb88320
#define CRCPOLY_BE 0x04c11db7
-/* How many bits at a time to use. Valid values are 1, 2, 4, 8, and 32. */
+/* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. */
/* For less performance-sensitive, use 4 or 8 */
#ifndef CRC_LE_BITS -# define CRC_LE_BITS 32
+# define CRC_LE_BITS 64
#endif
#ifndef CRC_BE_BITS
-# define CRC_BE_BITS 32
+# define CRC_BE_BITS 64
#endif
/*
* Little-endian CRC computation. Used with serial bit streams sent
* lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC.
*/
-#if CRC_LE_BITS > 32 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
+#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
CRC_LE_BITS & CRC_LE_BITS-1
-# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32}"
+# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 64}"
#endif
/*
* Big-endian CRC computation. Used with serial bit streams sent
* msbit-first. Be sure to use cpu_to_be32() to append the computed CRC.
*/
-#if CRC_BE_BITS > 32 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
+#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
CRC_BE_BITS & CRC_BE_BITS-1
-# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32}"
+# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 64}"
#endif
Index: infiniband/lib/gen_crc32table.c
===================================================================
--- infiniband.orig/lib/gen_crc32table.c
+++ infiniband/lib/gen_crc32table.c
@@ -4,20 +4,24 @@
#define ENTRIES_PER_LINE 4
-#if CRC_LE_BITS <= 8
-#define LE_TABLE_SIZE (1 << CRC_LE_BITS)
+#if CRC_LE_BITS > 8
+# define LE_TABLE_ROWS (CRC_LE_BITS/8)
+# define LE_TABLE_SIZE 256
#else
-#define LE_TABLE_SIZE 256
+# define LE_TABLE_ROWS 1
+# define LE_TABLE_SIZE (1 << CRC_LE_BITS)
#endif
-#if CRC_BE_BITS <= 8
-#define BE_TABLE_SIZE (1 << CRC_BE_BITS)
+#if CRC_BE_BITS > 8
+# define BE_TABLE_ROWS (CRC_BE_BITS/8)
+# define BE_TABLE_SIZE 256
#else
-#define BE_TABLE_SIZE 256
+# define BE_TABLE_ROWS 1
+# define BE_TABLE_SIZE (1 << CRC_BE_BITS)
#endif
-static uint32_t crc32table_le[4][256];
-static uint32_t crc32table_be[4][256];
+static uint32_t crc32table_le[LE_TABLE_ROWS][256];
+static uint32_t crc32table_be[BE_TABLE_ROWS][256];
/**
* crc32init_le() - allocate and initialize LE table data
@@ -40,7 +44,7 @@ static void crc32init_le(void)
}
for (i = 0; i < LE_TABLE_SIZE; i++) {
crc = crc32table_le[0][i];
- for (j = 1; j < 4; j++) {
+ for (j = 1; j < LE_TABLE_ROWS; j++) {
crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8);
crc32table_le[j][i] = crc;
}
@@ -64,18 +68,18 @@ static void crc32init_be(void)
}
for (i = 0; i < BE_TABLE_SIZE; i++) {
crc = crc32table_be[0][i];
- for (j = 1; j < 4; j++) {
+ for (j = 1; j < BE_TABLE_ROWS; j++) {
crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
crc32table_be[j][i] = crc;
}
}
}
-static void output_table(uint32_t table[4][256], int len, char *trans)
+static void output_table(uint32_t (*table)[256], int rows, int len, char *trans)
{
int i, j;
- for (j = 0 ; j < 4; j++) {
+ for (j = 0 ; j < rows; j++) {
printf("{");
for (i = 0; i < len - 1; i++) {
if (i % ENTRIES_PER_LINE == 0)
@@ -92,15 +96,19 @@ int main(int argc, char** argv)
if (CRC_LE_BITS > 1) {
crc32init_le();
- printf("static const u32 crc32table_le[4][256] = {");
- output_table(crc32table_le, LE_TABLE_SIZE, "tole");
+ printf("static const u32 crc32table_le[%d][%d] = {",
+ LE_TABLE_ROWS, LE_TABLE_SIZE);
+ output_table(crc32table_le, LE_TABLE_ROWS,
+ LE_TABLE_SIZE, "tole");
printf("};\n");
}
if (CRC_BE_BITS > 1) {
crc32init_be();
- printf("static const u32 crc32table_be[4][256] = {");
- output_table(crc32table_be, BE_TABLE_SIZE, "tobe");
+ printf("static const u32 crc32table_be[%d][%d] = {",
+ BE_TABLE_ROWS, BE_TABLE_SIZE);
+ output_table(crc32table_be, LE_TABLE_ROWS,
+ BE_TABLE_SIZE, "tobe");
printf("};\n");
}
^ permalink raw reply [flat|nested] 11+ messages in thread
* [patch v5 8/8] crc32-final-cleanup.diff
[not found] <20110810222018.281901163@systemfabricworks.com>
` (6 preceding siblings ...)
2011-08-10 22:44 ` [patch v5 7/8] crc32-add-slicing-by-8.diff Bob Pearson
@ 2011-08-10 22:45 ` Bob Pearson
7 siblings, 0 replies; 11+ messages in thread
From: Bob Pearson @ 2011-08-10 22:45 UTC (permalink / raw)
To: linux-kernel, joakim.tjernlund, akpm, linux, fzago
Some final cleanup changes
- added a comment at the top of crc32.c
- moved macros ahead of function prototype
- replaced loops with for (i = 0; i < xxx; i++) which
requires fewer instructions on x86 since the
buffer lookups can use i as an index.
Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
---
lib/crc32.c | 89 ++++++++++++++++++++++++++++--------------------------------
1 file changed, 43 insertions(+), 46 deletions(-)
Index: infiniband/lib/crc32.c
===================================================================
--- infiniband.orig/lib/crc32.c
+++ infiniband/lib/crc32.c
@@ -1,4 +1,8 @@
/*
+ * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
+ * cleaned up code to current version of sparse and added the slicing-by-8
+ * algorithm to the closely similar existing slicing-by-4 algorithm.
+ *
* Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
* Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks!
* Code was from the public domain, copyright abandoned. Code was
@@ -45,45 +49,41 @@ MODULE_LICENSE("GPL");
#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
-/* implements slicing-by-4 or slicing-by-8 algorithm */
-static inline u32
-crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
-{
# ifdef __LITTLE_ENDIAN
# define DO_CRC(x) (crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8))
-# define DO_CRC4 crc = t3[(crc) & 255] ^ \
- t2[(crc >> 8) & 255] ^ \
- t1[(crc >> 16) & 255] ^ \
- t0[(crc >> 24) & 255]
-# define DO_CRC8a (t7[(q) & 255] ^ \
- t6[(q >> 8) & 255] ^ \
- t5[(q >> 16) & 255] ^ \
- t4[(q >> 24) & 255])
-# define DO_CRC8b (t3[(q) & 255] ^ \
+# define DO_CRC4 (t3[(q) & 255] ^ \
t2[(q >> 8) & 255] ^ \
t1[(q >> 16) & 255] ^ \
t0[(q >> 24) & 255])
+# define DO_CRC8 (t7[(q) & 255] ^ \
+ t6[(q >> 8) & 255] ^ \
+ t5[(q >> 16) & 255] ^ \
+ t4[(q >> 24) & 255])
# else
# define DO_CRC(x) (crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8))
-# define DO_CRC4 crc = t0[(crc) & 255] ^ \
- t1[(crc >> 8) & 255] ^ \
- t2[(crc >> 16) & 255] ^ \
- t3[(crc >> 24) & 255]
-# define DO_CRC8a (t4[(q) & 255] ^ \
- t5[(q >> 8) & 255] ^ \
- t6[(q >> 16) & 255] ^ \
- t7[(q >> 24) & 255])
-# define DO_CRC8b (t0[(q) & 255] ^ \
+# define DO_CRC4 (t0[(q) & 255] ^ \
t1[(q >> 8) & 255] ^ \
t2[(q >> 16) & 255] ^ \
t3[(q >> 24) & 255])
+# define DO_CRC8 (t4[(q) & 255] ^ \
+ t5[(q >> 8) & 255] ^ \
+ t6[(q >> 16) & 255] ^ \
+ t7[(q >> 24) & 255])
# endif
+
+/* implements slicing-by-4 or slicing-by-8 algorithm */
+static inline u32 crc32_body(u32 crc, unsigned char const *buf,
+ size_t len, const u32 (*tab)[256])
+{
const u32 *b;
const u32 *t0 = tab[0], *t1 = tab[1], *t2 = tab[2], *t3 = tab[3];
const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
+ u8 *p;
+ u32 q;
size_t init_len;
size_t middle_len;
size_t rem_len;
+ size_t i;
/* break buf into init_len bytes before and
* rem_len bytes after a middle section with
@@ -99,37 +99,34 @@ crc32_body(u32 crc, unsigned char const rem_len = (len - init_len) & 7;
# endif
- /* Align it */
- if (unlikely(init_len)) {
- do {
- DO_CRC(*buf++);
- } while (--init_len);
- }
- b = (const u32 *)buf;
- for (--b; middle_len; --middle_len) {
+ /* process unaligned initial bytes */
+ for (i = 0; i < init_len; i++)
+ DO_CRC(*buf++);
+
+ /* process aligned words */
+ b = (const u32 *)(buf - 4);
+
+ for (i = 0; i < middle_len; i++) {
# if CRC_LE_BITS == 32
- crc ^= *++b; /* use pre increment for speed */
- DO_CRC4;
+ /* slicing-by-4 algorithm */
+ q = crc ^ *++b; /* use pre increment for speed */
+ crc = DO_CRC4;
# else
- u32 q;
+ /* slicing-by-8 algorithm */
q = crc ^ *++b;
- crc = DO_CRC8a;
+ crc = DO_CRC8;
q = *++b;
- crc ^= DO_CRC8b;
+ crc ^= DO_CRC4;
# endif
}
- /* And the last few bytes */
- if (rem_len) {
- u8 *p = (u8 *)(b + 1) - 1;
- do {
- DO_CRC(*++p); /* use pre increment for speed */
- } while (--rem_len);
- }
+
+ /* process unaligned remaining bytes */
+ p = (u8 *)(b + 1) - 1;
+
+ for (i = 0; i < rem_len; i++)
+ DO_CRC(*++p); /* use pre increment for speed */
+
return crc;
-#undef DO_CRC
-#undef DO_CRC4
-#undef DO_CRC8a
-#undef DO_CRC8b
}
#endif
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [patch v5 7/8] crc32-add-slicing-by-8.diff
2011-08-10 22:44 ` [patch v5 7/8] crc32-add-slicing-by-8.diff Bob Pearson
@ 2011-08-11 13:46 ` Joakim Tjernlund
2011-08-11 15:34 ` George Spelvin
1 sibling, 0 replies; 11+ messages in thread
From: Joakim Tjernlund @ 2011-08-11 13:46 UTC (permalink / raw)
To: Bob Pearson; +Cc: akpm, fzago, linux, linux-kernel
Bob Pearson <rpearson@systemfabricworks.com> wrote on 2011/08/11 00:44:52:
>
> extend add slicing-by-8 algorithm to the existing
> slicing-by-4 algorithm. This consists of:
>
> - extend largest BITS size from 32 to 64
> - extend table from tab[4][256] to tab[8][256]
> - change algorithm to align on 8 byte boundary
> (it was noted that all that is really required
> is that the inner loop must comsume 8 bytes.
> As written it can start on even or odd 4 byte
> boundary.)
> - Add code for inner loop.
>
> Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com>
>
> ---
> lib/crc32.c | 60 ++++++++++++++++++++++++++++++++++++++++++---------
> lib/crc32defs.h | 14 +++++------
> lib/gen_crc32table.c | 40 ++++++++++++++++++++--------------
While looking at gen_crc32table.c I see that much of my remarks still stands
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [patch v5 7/8] crc32-add-slicing-by-8.diff
2011-08-10 22:44 ` [patch v5 7/8] crc32-add-slicing-by-8.diff Bob Pearson
2011-08-11 13:46 ` Joakim Tjernlund
@ 2011-08-11 15:34 ` George Spelvin
2011-09-07 10:39 ` Joakim Tjernlund
1 sibling, 1 reply; 11+ messages in thread
From: George Spelvin @ 2011-08-11 15:34 UTC (permalink / raw)
To: akpm, fzago, joakim.tjernlund, linux-kernel, linux, rpearson
I don't know if you care, but here's some slightly more compact code for
creating the tables. It produces the same results, and I don't think
it's any slower.
I can explain it if anyone's confused, but it's hopefully fairly
easy to figure out assuming a backgriund in CRC math.
(Tested against existing code, not in kernel.)
Signed-off-by: George Spelvin <linux@horizon.com>
static void crc32init_le(void)
{
unsigned i, j, k;
uint32_t crc = 1;
for (i = 0; i < LE_TABLE_ROWS; i++) {
crc32table_le[i][0] = 0;
for (j = LE_TABLE_SIZE >> 1; j; j >>= 1) {
crc = (crc >> 1) ^ (crc & 1 ? CRCPOLY_LE : 0);
for (k = 0; k < LE_TABLE_SIZE; k += 2 * j)
crc32table_le[i][j + k] = crc ^ crc32table_le[i][k];
}
}
}
static void crc32init_be(void)
{
unsigned i, j, k;
uint32_t crc = 0x80000000;
for (i = 0; i < BE_TABLE_ROWS; i++) {
crc32table_be[i][0] = 0;
for (j = 1; j < BE_TABLE_SIZE; j <<= 1) {
crc = (crc << 1) ^ (crc & 0x80000000 ? CRCPOLY_BE : 0);
for (k = 0; k < j; k++)
crc32table_be[i][j + k] = crc ^ crc32table_be[i][k];
}
}
}
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [patch v5 7/8] crc32-add-slicing-by-8.diff
2011-08-11 15:34 ` George Spelvin
@ 2011-09-07 10:39 ` Joakim Tjernlund
0 siblings, 0 replies; 11+ messages in thread
From: Joakim Tjernlund @ 2011-09-07 10:39 UTC (permalink / raw)
To: George Spelvin; +Cc: akpm, fzago, linux-kernel, rpearson
"George Spelvin" <linux@horizon.com> wrote on 2011/08/11 17:34:01:
>
> I don't know if you care, but here's some slightly more compact code for
> creating the tables. It produces the same results, and I don't think
> it's any slower.
>
> I can explain it if anyone's confused, but it's hopefully fairly
> easy to figure out assuming a backgriund in CRC math.
>
> (Tested against existing code, not in kernel.)
> Signed-off-by: George Spelvin <linux@horizon.com>
Forgot about this mail. Looks really neat :)
Easy to generalize to support crc16 too.
Jocke
>
> static void crc32init_le(void)
> {
> unsigned i, j, k;
> uint32_t crc = 1;
>
> for (i = 0; i < LE_TABLE_ROWS; i++) {
> crc32table_le[i][0] = 0;
> for (j = LE_TABLE_SIZE >> 1; j; j >>= 1) {
> crc = (crc >> 1) ^ (crc & 1 ? CRCPOLY_LE : 0);
> for (k = 0; k < LE_TABLE_SIZE; k += 2 * j)
> crc32table_le[i][j + k] = crc ^ crc32table_le[i][k];
> }
> }
> }
>
> static void crc32init_be(void)
> {
> unsigned i, j, k;
> uint32_t crc = 0x80000000;
>
> for (i = 0; i < BE_TABLE_ROWS; i++) {
> crc32table_be[i][0] = 0;
> for (j = 1; j < BE_TABLE_SIZE; j <<= 1) {
> crc = (crc << 1) ^ (crc & 0x80000000 ? CRCPOLY_BE : 0);
> for (k = 0; k < j; k++)
> crc32table_be[i][j + k] = crc ^ crc32table_be[i][k];
> }
> }
> }
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2011-09-07 16:35 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20110810222018.281901163@systemfabricworks.com>
2011-08-10 22:43 ` [patch v5 1/8] crc32-add-pointer-to-tab.diff Bob Pearson
2011-08-10 22:43 ` [patch v5 2/8] crc32-move-to-documentation.diff Bob Pearson
2011-08-10 22:44 ` [patch v5 3/8] crc32-replace-self-test.diff Bob Pearson
2011-08-10 22:44 ` [patch v5 4/8] crc32-misc-cleanup.diff Bob Pearson
2011-08-10 22:44 ` [patch v5 5/8] crc32-fix-check-endian-warnings.diff Bob Pearson
2011-08-10 22:44 ` [patch v5 6/8] crc32-add-real-8-bit.diff Bob Pearson
2011-08-10 22:44 ` [patch v5 7/8] crc32-add-slicing-by-8.diff Bob Pearson
2011-08-11 13:46 ` Joakim Tjernlund
2011-08-11 15:34 ` George Spelvin
2011-09-07 10:39 ` Joakim Tjernlund
2011-08-10 22:45 ` [patch v5 8/8] crc32-final-cleanup.diff Bob Pearson
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