test_multipathio_compareandwrite.c

/*
   Copyright (C) 2013 Ronnie Sahlberg <ronniesahlberg@gmail.com>
   Copyright (C) 2015 David Disseldorp

   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 <inttypes.h>
#include <stdlib.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"

void
test_multipathio_compareandwrite(void)
{
        int io_bl = 1;        /* 1 block CAW IOs */
        int path;
        int i, n, ret;
        int maxbl;

        CHECK_FOR_DATALOSS;
        CHECK_FOR_SBC;
        MPATH_SKIP_IF_UNAVAILABLE(mp_sds, mp_num_sds);

        if (inq_bl) {
                maxbl = inq_bl->max_cmp;
        } else {
                /* Assume we are not limited */
                maxbl = 255;
        }
        if (maxbl < io_bl) {
                CU_PASS("[SKIPPED] MAXIMUM_COMPARE_AND_WRITE_LENGTH too small");
                return;
        }

        n = 255;
        if (n + 0U > num_blocks)
                n = num_blocks;
        
        logging(LOG_VERBOSE, LOG_BLANK_LINE);
        logging(LOG_VERBOSE, "Initialising data prior to COMPARE_AND_WRITE");

        memset(scratch, 0, io_bl * block_size);
        ret = writesame10(mp_sds[0], 0,
                          block_size, 256, 0, 0, 0, 0, scratch,
                          EXPECT_STATUS_GOOD);
        if (ret == -2) {
                CU_PASS("[SKIPPED] Target does not support WRITESAME10. Skipping test");
                return;
        }
        CU_ASSERT_EQUAL(ret, 0);

        logging(LOG_VERBOSE, "Test multipath COMPARE_AND_WRITE");
        for (i = 0; i <= n; i++) {

                for (path = 0; path < mp_num_sds; path++) {
                        logging(LOG_VERBOSE,
                                "Test COMPARE_AND_WRITE(%d->%d) using path %d",
                                path, path + 1, path);

                        /* compare data is first half */
                        memset(scratch, path, io_bl * block_size);
                        /* write data is the second half, wrap around */
                        memset(scratch + io_bl * block_size, path + 1,
                               io_bl * block_size);
                        COMPAREANDWRITE(mp_sds[path], i,
                                        scratch, 2 * io_bl * block_size,
                                        block_size, 0, 0, 0, 0,
                                        EXPECT_STATUS_GOOD);

                        logging(LOG_VERBOSE,
                                "Test bad COMPARE_AND_WRITE(%d->%d)",
                                path, path + 1);

                        COMPAREANDWRITE(mp_sds[path], i,
                                        scratch, 2 * io_bl * block_size,
                                        block_size, 0, 0, 0, 0,
                                        EXPECT_MISCOMPARE);
                }
        }
}