linux/crypto/async_tx/raid6test.c
Dan Williams 09ec0f583f raid6test: add new corner case for ioatdma driver
With 24 disks and an ioatdma instance with 16 source support there is a
corner case where the driver needs to be careful to account for the
number of implied sources in the continuation case.

Also bump the default case to test more than 16 sources now that it
triggers different paths in offload drivers.

Cc: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2013-11-14 11:04:42 -08:00

254 lines
6.5 KiB
C

/*
* asynchronous raid6 recovery self test
* Copyright (c) 2009, Intel Corporation.
*
* based on drivers/md/raid6test/test.c:
* Copyright 2002-2007 H. Peter Anvin
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <linux/async_tx.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/module.h>
#undef pr
#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
#define NDISKS 64 /* Including P and Q */
static struct page *dataptrs[NDISKS];
static addr_conv_t addr_conv[NDISKS];
static struct page *data[NDISKS+3];
static struct page *spare;
static struct page *recovi;
static struct page *recovj;
static void callback(void *param)
{
struct completion *cmp = param;
complete(cmp);
}
static void makedata(int disks)
{
int i;
for (i = 0; i < disks; i++) {
prandom_bytes(page_address(data[i]), PAGE_SIZE);
dataptrs[i] = data[i];
}
}
static char disk_type(int d, int disks)
{
if (d == disks - 2)
return 'P';
else if (d == disks - 1)
return 'Q';
else
return 'D';
}
/* Recover two failed blocks. */
static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
{
struct async_submit_ctl submit;
struct completion cmp;
struct dma_async_tx_descriptor *tx = NULL;
enum sum_check_flags result = ~0;
if (faila > failb)
swap(faila, failb);
if (failb == disks-1) {
if (faila == disks-2) {
/* P+Q failure. Just rebuild the syndrome. */
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
} else {
struct page *blocks[disks];
struct page *dest;
int count = 0;
int i;
/* data+Q failure. Reconstruct data from P,
* then rebuild syndrome
*/
for (i = disks; i-- ; ) {
if (i == faila || i == failb)
continue;
blocks[count++] = ptrs[i];
}
dest = ptrs[faila];
init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
NULL, NULL, addr_conv);
tx = async_xor(dest, blocks, 0, count, bytes, &submit);
init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
}
} else {
if (failb == disks-2) {
/* data+P failure. */
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit);
} else {
/* data+data failure. */
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit);
}
}
init_completion(&cmp);
init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit);
async_tx_issue_pending(tx);
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
__func__, faila, failb, disks);
if (result != 0)
pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
__func__, faila, failb, result);
}
static int test_disks(int i, int j, int disks)
{
int erra, errb;
memset(page_address(recovi), 0xf0, PAGE_SIZE);
memset(page_address(recovj), 0xba, PAGE_SIZE);
dataptrs[i] = recovi;
dataptrs[j] = recovj;
raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);
erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
pr("%s(%d, %d): faila=%3d(%c) failb=%3d(%c) %s\n",
__func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
(!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");
dataptrs[i] = data[i];
dataptrs[j] = data[j];
return erra || errb;
}
static int test(int disks, int *tests)
{
struct dma_async_tx_descriptor *tx;
struct async_submit_ctl submit;
struct completion cmp;
int err = 0;
int i, j;
recovi = data[disks];
recovj = data[disks+1];
spare = data[disks+2];
makedata(disks);
/* Nuke syndromes */
memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);
/* Generate assumed good syndrome */
init_completion(&cmp);
init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit);
async_tx_issue_pending(tx);
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
pr("error: initial gen_syndrome(%d) timed out\n", disks);
return 1;
}
pr("testing the %d-disk case...\n", disks);
for (i = 0; i < disks-1; i++)
for (j = i+1; j < disks; j++) {
(*tests)++;
err += test_disks(i, j, disks);
}
return err;
}
static int raid6_test(void)
{
int err = 0;
int tests = 0;
int i;
for (i = 0; i < NDISKS+3; i++) {
data[i] = alloc_page(GFP_KERNEL);
if (!data[i]) {
while (i--)
put_page(data[i]);
return -ENOMEM;
}
}
/* the 4-disk and 5-disk cases are special for the recovery code */
if (NDISKS > 4)
err += test(4, &tests);
if (NDISKS > 5)
err += test(5, &tests);
/* the 11 and 12 disk cases are special for ioatdma (p-disabled
* q-continuation without extended descriptor)
*/
if (NDISKS > 12) {
err += test(11, &tests);
err += test(12, &tests);
}
/* the 24 disk case is special for ioatdma as it is the boudary point
* at which it needs to switch from 8-source ops to 16-source
* ops for continuation (assumes DMA_HAS_PQ_CONTINUE is not set)
*/
if (NDISKS > 24)
err += test(24, &tests);
err += test(NDISKS, &tests);
pr("\n");
pr("complete (%d tests, %d failure%s)\n",
tests, err, err == 1 ? "" : "s");
for (i = 0; i < NDISKS+3; i++)
put_page(data[i]);
return 0;
}
static void raid6_test_exit(void)
{
}
/* when compiled-in wait for drivers to load first (assumes dma drivers
* are also compliled-in)
*/
late_initcall(raid6_test);
module_exit(raid6_test_exit);
MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
MODULE_LICENSE("GPL");