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/*
Copyright (C) SUSE LINUX GmbH 2016
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <signal.h>
#include <poll.h>
#include <CUnit/CUnit.h>
#include "iscsi.h"
#include "scsi-lowlevel.h"
#include "iscsi-support.h"
#include "iscsi-test-cu.h"
#include "iscsi-multipath.h"
struct test_mpio_async_caw_state {
uint32_t dispatched;
uint32_t completed;
uint32_t mismatches;
};
static void
test_mpio_async_caw_cb(struct iscsi_context *iscsi __attribute__((unused)),
int status, void *command_data, void *private_data)
{
struct scsi_task *atask = command_data;
struct test_mpio_async_caw_state *state = private_data;
state->completed++;
if (status == SCSI_STATUS_CHECK_CONDITION) {
CU_ASSERT_EQUAL(atask->sense.key, SCSI_SENSE_MISCOMPARE);
CU_ASSERT_EQUAL(atask->sense.ascq,
SCSI_SENSE_ASCQ_MISCOMPARE_DURING_VERIFY);
state->mismatches++;
logging(LOG_VERBOSE, "COMPARE_AND_WRITE mismatch: %d of %d "
"(CmdSN=%d)",
state->completed, state->dispatched, atask->cmdsn);
} else {
logging(LOG_VERBOSE, "COMPARE_AND_WRITE success: %d of %d "
"(CmdSN=%d)",
state->completed, state->dispatched, atask->cmdsn);
}
scsi_free_scsi_task(atask);
}
static void
test_mpio_async_caw_init_bufs(unsigned char *cmp_buf, unsigned char *wr_buf,
int blocksize, int num_mp_sds)
{
int sd_i;
/*
* Each compare and write attempts to modify on-disk data with the
* assumption that the previous operation was successful. E.g.
*
* session 0 session 1
* --------- ---------
* 0->1 (good)
* 1->0 (good)
*
* This gives us some nice races if the target processes the requests
* out of order. E.g.
* 0->1 (good)
* 1->0 (good)
* 1->0 (mismatch!)
* 0->1 (good)
*/
for (sd_i = 0; sd_i < num_mp_sds; sd_i++) {
int wr_val;
int cmp_val = sd_i;
if (sd_i == num_mp_sds - 1) {
wr_val = 0;
} else {
wr_val = sd_i + 1;
}
memset(&cmp_buf[sd_i * blocksize], cmp_val, blocksize);
memset(&wr_buf[sd_i * blocksize], wr_val, blocksize);
}
}
void
test_mpio_async_caw(void)
{
int i, ret;
int sd_i;
struct test_mpio_async_caw_state state = { 0, 0, 0 };
int num_ios = 1000;
uint32_t lba = 0;
unsigned char *cmp_buf;
unsigned char *wr_buf;
struct pollfd *pfd;
CHECK_FOR_DATALOSS;
CHECK_FOR_SBC;
MPATH_SKIP_IF_UNAVAILABLE(mp_sds, mp_num_sds);
MPATH_SKIP_UNLESS_ISCSI(mp_sds, mp_num_sds);
cmp_buf = malloc(block_size * mp_num_sds);
CU_ASSERT(cmp_buf != NULL);
if (!cmp_buf)
return;
wr_buf = malloc(block_size * mp_num_sds);
CU_ASSERT(wr_buf != NULL);
if (!wr_buf)
goto free_cmp_buf;
pfd = malloc(mp_num_sds * sizeof(struct pollfd));
CU_ASSERT(pfd != NULL);
if (!pfd)
goto free_wr_buf;
/* synchronously initialise zeros for first CAW */
memset(wr_buf, 0, block_size);
WRITESAME10(mp_sds[0], 0, block_size, 1, 0, 0, 0, 0, wr_buf,
EXPECT_STATUS_GOOD);
test_mpio_async_caw_init_bufs(cmp_buf, wr_buf, block_size, mp_num_sds);
for (i = 0; i < num_ios; i++) {
/* queue a one-block CAW task on each MPIO sessions */
for (sd_i = 0; sd_i < mp_num_sds; sd_i++) {
struct scsi_task *atask;
int buf_off = sd_i * block_size;
atask = scsi_cdb_compareandwrite(lba, block_size * 2,
block_size,
0, 0, 0, 0, 0);
CU_ASSERT_PTR_NOT_NULL_FATAL(atask);
/* compare data is first, followed by write data */
ret = scsi_task_add_data_out_buffer(atask,
block_size,
&cmp_buf[buf_off]);
CU_ASSERT_EQUAL(ret, 0);
ret = scsi_task_add_data_out_buffer(atask,
block_size,
&wr_buf[buf_off]);
CU_ASSERT_EQUAL(ret, 0);
ret = iscsi_scsi_command_async(mp_sds[sd_i]->iscsi_ctx,
mp_sds[sd_i]->iscsi_lun,
atask,
test_mpio_async_caw_cb,
NULL, &state);
CU_ASSERT_EQUAL(ret, 0);
state.dispatched++;
logging(LOG_VERBOSE, "COMPARE_AND_WRITE dispatched: "
"%d of %d (cmdsn=%d)",
state.dispatched, num_ios, atask->cmdsn);
}
}
while (state.completed < state.dispatched) {
for (sd_i = 0; sd_i < mp_num_sds; sd_i++) {
pfd[sd_i].fd = iscsi_get_fd(mp_sds[sd_i]->iscsi_ctx);
pfd[sd_i].events
= iscsi_which_events(mp_sds[sd_i]->iscsi_ctx);
}
ret = poll(pfd, mp_num_sds, -1);
CU_ASSERT_NOT_EQUAL(ret, -1);
for (sd_i = 0; sd_i < mp_num_sds; sd_i++) {
if (!pfd[sd_i].revents) {
continue;
}
ret = iscsi_service(mp_sds[sd_i]->iscsi_ctx,
pfd[sd_i].revents);
CU_ASSERT_EQUAL(ret, 0);
}
}
logging(LOG_VERBOSE, "[OK] All %d COMPARE_AND_WRITE IOs complete, with "
"%d mismatch(es)", state.completed, state.mismatches);
free_wr_buf:
free(wr_buf);
free_cmp_buf:
free(cmp_buf);
}
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