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linux/lib/reed_solomon/test_rslib.c

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rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
// SPDX-License-Identifier: GPL-2.0
/*
* Tests for Generic Reed Solomon encoder / decoder library
*
* Written by Ferdinand Blomqvist
* Based on previous work by Phil Karn, KA9Q
*/
#include <linux/rslib.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/random.h>
#include <linux/slab.h>
enum verbosity {
V_SILENT,
V_PROGRESS,
V_CSUMMARY
};
enum method {
CORR_BUFFER,
CALLER_SYNDROME,
IN_PLACE
};
#define __param(type, name, init, msg) \
static type name = init; \
module_param(name, type, 0444); \
MODULE_PARM_DESC(name, msg)
__param(int, v, V_PROGRESS, "Verbosity level");
__param(int, ewsc, 1, "Erasures without symbol corruption");
__param(int, bc, 1, "Test for correct behaviour beyond error correction capacity");
struct etab {
int symsize;
int genpoly;
int fcs;
int prim;
int nroots;
int ntrials;
};
/* List of codes to test */
static struct etab Tab[] = {
{2, 0x7, 1, 1, 1, 100000 },
{3, 0xb, 1, 1, 2, 100000 },
{3, 0xb, 1, 1, 3, 100000 },
{3, 0xb, 2, 1, 4, 100000 },
{4, 0x13, 1, 1, 4, 10000 },
{5, 0x25, 1, 1, 6, 1000 },
{6, 0x43, 3, 1, 8, 1000 },
{7, 0x89, 1, 1, 14, 500 },
{8, 0x11d, 1, 1, 30, 100 },
{8, 0x187, 112, 11, 32, 100 },
{9, 0x211, 1, 1, 33, 80 },
{0, 0, 0, 0, 0, 0},
};
struct estat {
int dwrong;
int irv;
int wepos;
int nwords;
};
struct bcstat {
int rfail;
int rsuccess;
int noncw;
int nwords;
};
struct wspace {
uint16_t *c; /* sent codeword */
uint16_t *r; /* received word */
uint16_t *s; /* syndrome */
uint16_t *corr; /* correction buffer */
int *errlocs;
int *derrlocs;
};
struct pad {
int mult;
int shift;
};
static struct pad pad_coef[] = {
{ 0, 0 },
{ 1, 2 },
{ 1, 1 },
{ 3, 2 },
{ 1, 0 },
};
static void free_ws(struct wspace *ws)
{
if (!ws)
return;
kfree(ws->errlocs);
kfree(ws->c);
kfree(ws);
}
static struct wspace *alloc_ws(struct rs_codec *rs)
{
int nroots = rs->nroots;
struct wspace *ws;
int nn = rs->nn;
ws = kzalloc(sizeof(*ws), GFP_KERNEL);
if (!ws)
return NULL;
ws->c = kmalloc_array(2 * (nn + nroots),
sizeof(uint16_t), GFP_KERNEL);
if (!ws->c)
goto err;
ws->r = ws->c + nn;
ws->s = ws->r + nn;
ws->corr = ws->s + nroots;
ws->errlocs = kmalloc_array(nn + nroots, sizeof(int), GFP_KERNEL);
if (!ws->errlocs)
goto err;
ws->derrlocs = ws->errlocs + nn;
return ws;
err:
free_ws(ws);
return NULL;
}
/*
* Generates a random codeword and stores it in c. Generates random errors and
* erasures, and stores the random word with errors in r. Erasure positions are
* stored in derrlocs, while errlocs has one of three values in every position:
*
* 0 if there is no error in this position;
* 1 if there is a symbol error in this position;
* 2 if there is an erasure without symbol corruption.
*
* Returns the number of corrupted symbols.
*/
static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
int len, int errs, int eras)
{
int nroots = rs->codec->nroots;
int *derrlocs = ws->derrlocs;
int *errlocs = ws->errlocs;
int dlen = len - nroots;
int nn = rs->codec->nn;
uint16_t *c = ws->c;
uint16_t *r = ws->r;
int errval;
int errloc;
int i;
/* Load c with random data and encode */
for (i = 0; i < dlen; i++)
treewide: use get_random_u32() when possible The prandom_u32() function has been a deprecated inline wrapper around get_random_u32() for several releases now, and compiles down to the exact same code. Replace the deprecated wrapper with a direct call to the real function. The same also applies to get_random_int(), which is just a wrapper around get_random_u32(). This was done as a basic find and replace. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> # for sch_cake Acked-by: Chuck Lever <chuck.lever@oracle.com> # for nfsd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # for thunderbolt Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Acked-by: Helge Deller <deller@gmx.de> # for parisc Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-05 18:43:22 +03:00
c[i] = get_random_u32() & nn;
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
memset(c + dlen, 0, nroots * sizeof(*c));
encode_rs16(rs, c, dlen, c + dlen, 0);
/* Make copyand add errors and erasures */
memcpy(r, c, len * sizeof(*r));
memset(errlocs, 0, len * sizeof(*errlocs));
memset(derrlocs, 0, nroots * sizeof(*derrlocs));
/* Generating random errors */
for (i = 0; i < errs; i++) {
do {
/* Error value must be nonzero */
treewide: use get_random_u32() when possible The prandom_u32() function has been a deprecated inline wrapper around get_random_u32() for several releases now, and compiles down to the exact same code. Replace the deprecated wrapper with a direct call to the real function. The same also applies to get_random_int(), which is just a wrapper around get_random_u32(). This was done as a basic find and replace. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> # for sch_cake Acked-by: Chuck Lever <chuck.lever@oracle.com> # for nfsd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # for thunderbolt Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Acked-by: Helge Deller <deller@gmx.de> # for parisc Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-05 18:43:22 +03:00
errval = get_random_u32() & nn;
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
} while (errval == 0);
do {
/* Must not choose the same location twice */
treewide: use get_random_u32_below() instead of deprecated function This is a simple mechanical transformation done by: @@ expression E; @@ - prandom_u32_max + get_random_u32_below (E) Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Reviewed-by: SeongJae Park <sj@kernel.org> # for damon Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> # for infiniband Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> # for arm Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-10 05:44:02 +03:00
errloc = get_random_u32_below(len);
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
} while (errlocs[errloc] != 0);
errlocs[errloc] = 1;
r[errloc] ^= errval;
}
/* Generating random erasures */
for (i = 0; i < eras; i++) {
do {
/* Must not choose the same location twice */
treewide: use get_random_u32_below() instead of deprecated function This is a simple mechanical transformation done by: @@ expression E; @@ - prandom_u32_max + get_random_u32_below (E) Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Reviewed-by: SeongJae Park <sj@kernel.org> # for damon Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> # for infiniband Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> # for arm Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-10 05:44:02 +03:00
errloc = get_random_u32_below(len);
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
} while (errlocs[errloc] != 0);
derrlocs[i] = errloc;
treewide: use get_random_u32_below() instead of deprecated function This is a simple mechanical transformation done by: @@ expression E; @@ - prandom_u32_max + get_random_u32_below (E) Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Reviewed-by: SeongJae Park <sj@kernel.org> # for damon Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> # for infiniband Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> # for arm Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-10 05:44:02 +03:00
if (ewsc && get_random_u32_below(2)) {
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
/* Erasure with the symbol intact */
errlocs[errloc] = 2;
} else {
/* Erasure with corrupted symbol */
do {
/* Error value must be nonzero */
treewide: use get_random_u32() when possible The prandom_u32() function has been a deprecated inline wrapper around get_random_u32() for several releases now, and compiles down to the exact same code. Replace the deprecated wrapper with a direct call to the real function. The same also applies to get_random_int(), which is just a wrapper around get_random_u32(). This was done as a basic find and replace. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> # for sch_cake Acked-by: Chuck Lever <chuck.lever@oracle.com> # for nfsd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # for thunderbolt Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Acked-by: Helge Deller <deller@gmx.de> # for parisc Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-05 18:43:22 +03:00
errval = get_random_u32() & nn;
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
} while (errval == 0);
errlocs[errloc] = 1;
r[errloc] ^= errval;
errs++;
}
}
return errs;
}
static void fix_err(uint16_t *data, int nerrs, uint16_t *corr, int *errlocs)
{
int i;
for (i = 0; i < nerrs; i++)
data[errlocs[i]] ^= corr[i];
}
static void compute_syndrome(struct rs_control *rsc, uint16_t *data,
int len, uint16_t *syn)
{
struct rs_codec *rs = rsc->codec;
uint16_t *alpha_to = rs->alpha_to;
uint16_t *index_of = rs->index_of;
int nroots = rs->nroots;
int prim = rs->prim;
int fcr = rs->fcr;
int i, j;
/* Calculating syndrome */
for (i = 0; i < nroots; i++) {
syn[i] = data[0];
for (j = 1; j < len; j++) {
if (syn[i] == 0) {
syn[i] = data[j];
} else {
syn[i] = data[j] ^
alpha_to[rs_modnn(rs, index_of[syn[i]]
+ (fcr + i) * prim)];
}
}
}
/* Convert to index form */
for (i = 0; i < nroots; i++)
syn[i] = rs->index_of[syn[i]];
}
/* Test up to error correction capacity */
static void test_uc(struct rs_control *rs, int len, int errs,
int eras, int trials, struct estat *stat,
struct wspace *ws, int method)
{
int dlen = len - rs->codec->nroots;
int *derrlocs = ws->derrlocs;
int *errlocs = ws->errlocs;
uint16_t *corr = ws->corr;
uint16_t *c = ws->c;
uint16_t *r = ws->r;
uint16_t *s = ws->s;
int derrs, nerrs;
int i, j;
for (j = 0; j < trials; j++) {
nerrs = get_rcw_we(rs, ws, len, errs, eras);
switch (method) {
case CORR_BUFFER:
derrs = decode_rs16(rs, r, r + dlen, dlen,
NULL, eras, derrlocs, 0, corr);
fix_err(r, derrs, corr, derrlocs);
break;
case CALLER_SYNDROME:
compute_syndrome(rs, r, len, s);
derrs = decode_rs16(rs, NULL, NULL, dlen,
s, eras, derrlocs, 0, corr);
fix_err(r, derrs, corr, derrlocs);
break;
case IN_PLACE:
derrs = decode_rs16(rs, r, r + dlen, dlen,
NULL, eras, derrlocs, 0, NULL);
break;
default:
continue;
}
if (derrs != nerrs)
stat->irv++;
if (method != IN_PLACE) {
for (i = 0; i < derrs; i++) {
if (errlocs[derrlocs[i]] != 1)
stat->wepos++;
}
}
if (memcmp(r, c, len * sizeof(*r)))
stat->dwrong++;
}
stat->nwords += trials;
}
rslib: Make some functions static Fix sparse warnings: lib/reed_solomon/test_rslib.c:313:5: warning: symbol 'ex_rs_helper' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:349:5: warning: symbol 'exercise_rs' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:407:5: warning: symbol 'exercise_rs_bc' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: <ferdinand.blomqvist@gmail.com> Link: https://lkml.kernel.org/r/20190702061847.26060-1-yuehaibing@huawei.com
2019-07-02 09:18:47 +03:00
static int ex_rs_helper(struct rs_control *rs, struct wspace *ws,
int len, int trials, int method)
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
{
static const char * const desc[] = {
"Testing correction buffer interface...",
"Testing with caller provided syndrome...",
"Testing in-place interface..."
};
struct estat stat = {0, 0, 0, 0};
int nroots = rs->codec->nroots;
int errs, eras, retval;
if (v >= V_PROGRESS)
pr_info(" %s\n", desc[method]);
for (errs = 0; errs <= nroots / 2; errs++)
for (eras = 0; eras <= nroots - 2 * errs; eras++)
test_uc(rs, len, errs, eras, trials, &stat, ws, method);
if (v >= V_CSUMMARY) {
pr_info(" Decodes wrong: %d / %d\n",
stat.dwrong, stat.nwords);
pr_info(" Wrong return value: %d / %d\n",
stat.irv, stat.nwords);
if (method != IN_PLACE)
pr_info(" Wrong error position: %d\n", stat.wepos);
}
retval = stat.dwrong + stat.wepos + stat.irv;
if (retval && v >= V_PROGRESS)
pr_warn(" FAIL: %d decoding failures!\n", retval);
return retval;
}
rslib: Make some functions static Fix sparse warnings: lib/reed_solomon/test_rslib.c:313:5: warning: symbol 'ex_rs_helper' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:349:5: warning: symbol 'exercise_rs' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:407:5: warning: symbol 'exercise_rs_bc' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: <ferdinand.blomqvist@gmail.com> Link: https://lkml.kernel.org/r/20190702061847.26060-1-yuehaibing@huawei.com
2019-07-02 09:18:47 +03:00
static int exercise_rs(struct rs_control *rs, struct wspace *ws,
int len, int trials)
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
{
int retval = 0;
int i;
if (v >= V_PROGRESS)
pr_info("Testing up to error correction capacity...\n");
for (i = 0; i <= IN_PLACE; i++)
retval |= ex_rs_helper(rs, ws, len, trials, i);
return retval;
}
/* Tests for correct behaviour beyond error correction capacity */
static void test_bc(struct rs_control *rs, int len, int errs,
int eras, int trials, struct bcstat *stat,
struct wspace *ws)
{
int nroots = rs->codec->nroots;
int dlen = len - nroots;
int *derrlocs = ws->derrlocs;
uint16_t *corr = ws->corr;
uint16_t *r = ws->r;
int derrs, j;
for (j = 0; j < trials; j++) {
get_rcw_we(rs, ws, len, errs, eras);
derrs = decode_rs16(rs, r, r + dlen, dlen,
NULL, eras, derrlocs, 0, corr);
fix_err(r, derrs, corr, derrlocs);
if (derrs >= 0) {
stat->rsuccess++;
/*
* We check that the returned word is actually a
lib: fix spelling mistakes Fix some spelling mistakes in comments: permanentely ==> permanently wont ==> won't remaning ==> remaining succed ==> succeed shouldnt ==> shouldn't alpha-numeric ==> alphanumeric storeing ==> storing funtion ==> function documenation ==> documentation Determin ==> Determine intepreted ==> interpreted ammount ==> amount obious ==> obvious interupts ==> interrupts occured ==> occurred asssociated ==> associated taking into acount ==> taking into account squence ==> sequence stil ==> still contiguos ==> contiguous matchs ==> matches Link: https://lkml.kernel.org/r/20210607072555.12416-1-thunder.leizhen@huawei.com Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-07-08 04:07:31 +03:00
* codeword. The obvious way to do this would be to
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
* compute the syndrome, but we don't want to replicate
* that code here. However, all the codes are in
* systematic form, and therefore we can encode the
* returned word, and see whether the parity changes or
* not.
*/
memset(corr, 0, nroots * sizeof(*corr));
encode_rs16(rs, r, dlen, corr, 0);
if (memcmp(r + dlen, corr, nroots * sizeof(*corr)))
stat->noncw++;
} else {
stat->rfail++;
}
}
stat->nwords += trials;
}
rslib: Make some functions static Fix sparse warnings: lib/reed_solomon/test_rslib.c:313:5: warning: symbol 'ex_rs_helper' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:349:5: warning: symbol 'exercise_rs' was not declared. Should it be static? lib/reed_solomon/test_rslib.c:407:5: warning: symbol 'exercise_rs_bc' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: <ferdinand.blomqvist@gmail.com> Link: https://lkml.kernel.org/r/20190702061847.26060-1-yuehaibing@huawei.com
2019-07-02 09:18:47 +03:00
static int exercise_rs_bc(struct rs_control *rs, struct wspace *ws,
int len, int trials)
rslib: Add tests for the encoder and decoder A Reed-Solomon code with minimum distance d can correct any error and erasure pattern that satisfies 2 * #error + #erasures < d. If the error correction capacity is exceeded, then correct decoding cannot be guaranteed. The decoder must, however, return a valid codeword or report failure. There are two main tests: - Check for correct behaviour up to the error correction capacity - Check for correct behaviour beyond error corrupted capacity Both tests are simple: 1. Generate random data 2. Encode data with the chosen code 3. Add errors and erasures to data 4. Decode the corrupted word 5. Check for correct behaviour When testing up to capacity we test for: - Correct decoding - Correct return value (i.e. the number of corrected symbols) - That the returned error positions are correct There are two kinds of erasures; the erased symbol can be corrupted or not. When counting the number of corrected symbols, erasures without symbol corruption should not be counted. Similarly, the returned error positions should only include positions where a correction is necessary. We run the up to capacity tests for three different interfaces of decode_rs: - Use the correction buffers - Use the correction buffers with syndromes provided by the caller - Error correction in place (does not check the error positions) When testing beyond capacity test for silent failures. A silent failure is when the decoder returns success but the returned word is not a valid codeword. There are a couple of options for the tests: - Verbosity. - Whether to test for correct behaviour beyond capacity. Default is to test beyond capacity. - Whether to allow erasures without symbol corruption. Defaults to yes. Note that the tests take a couple of minutes to complete. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-2-ferdinand.blomqvist@gmail.com
2019-06-20 17:10:33 +03:00
{
struct bcstat stat = {0, 0, 0, 0};
int nroots = rs->codec->nroots;
int errs, eras, cutoff;
if (v >= V_PROGRESS)
pr_info("Testing beyond error correction capacity...\n");
for (errs = 1; errs <= nroots; errs++) {
eras = nroots - 2 * errs + 1;
if (eras < 0)
eras = 0;
cutoff = nroots <= len - errs ? nroots : len - errs;
for (; eras <= cutoff; eras++)
test_bc(rs, len, errs, eras, trials, &stat, ws);
}
if (v >= V_CSUMMARY) {
pr_info(" decoder gives up: %d / %d\n",
stat.rfail, stat.nwords);
pr_info(" decoder returns success: %d / %d\n",
stat.rsuccess, stat.nwords);
pr_info(" not a codeword: %d / %d\n",
stat.noncw, stat.rsuccess);
}
if (stat.noncw && v >= V_PROGRESS)
pr_warn(" FAIL: %d silent failures!\n", stat.noncw);
return stat.noncw;
}
static int run_exercise(struct etab *e)
{
int nn = (1 << e->symsize) - 1;
int kk = nn - e->nroots;
struct rs_control *rsc;
int retval = -ENOMEM;
int max_pad = kk - 1;
int prev_pad = -1;
struct wspace *ws;
int i;
rsc = init_rs(e->symsize, e->genpoly, e->fcs, e->prim, e->nroots);
if (!rsc)
return retval;
ws = alloc_ws(rsc->codec);
if (!ws)
goto err;
retval = 0;
for (i = 0; i < ARRAY_SIZE(pad_coef); i++) {
int pad = (pad_coef[i].mult * max_pad) >> pad_coef[i].shift;
int len = nn - pad;
if (pad == prev_pad)
continue;
prev_pad = pad;
if (v >= V_PROGRESS) {
pr_info("Testing (%d,%d)_%d code...\n",
len, kk - pad, nn + 1);
}
retval |= exercise_rs(rsc, ws, len, e->ntrials);
if (bc)
retval |= exercise_rs_bc(rsc, ws, len, e->ntrials);
}
free_ws(ws);
err:
free_rs(rsc);
return retval;
}
static int __init test_rslib_init(void)
{
int i, fail = 0;
for (i = 0; Tab[i].symsize != 0 ; i++) {
int retval;
retval = run_exercise(Tab + i);
if (retval < 0)
return -ENOMEM;
fail |= retval;
}
if (fail)
pr_warn("rslib: test failed\n");
else
pr_info("rslib: test ok\n");
return -EAGAIN; /* Fail will directly unload the module */
}
static void __exit test_rslib_exit(void)
{
}
module_init(test_rslib_init)
module_exit(test_rslib_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ferdinand Blomqvist");
MODULE_DESCRIPTION("Reed-Solomon library test");
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