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# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (c) 2015-2016 Western Digital Corporation or its affiliates.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Author: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com>
#
""" Inherit TestNVMeIO for nvme read/write operations """
import os
from nvme_test import TestNVMe
class TestNVMeIO(TestNVMe):
"""
Variable and Methods required to perform nvme read/write.
- Attributes:
- data_size : data size to perform IO.
- start_block : starting block of to perform IO.
- block_count : Number of blocks to use in IO.
- write_file : data file to use in nvme write command.
- read_file : data file to use in nvme read command.
"""
def setUp(self):
""" Pre Section for TestNVMeIO """
super().setUp()
# common code used in various testcases.
self.data_size = 512
self.start_block = 0
self.block_count = 0
self.write_file = "write_file.txt"
self.read_file = "read_file.txt"
def tearDown(self):
""" Post Section for TestNVMeIO """
super().tearDown()
def create_data_file(self, pathname, data_size, pattern):
""" Creates data file with specific pattern
- Args:
- pathname : data file path name.
- data_size : total size of the data.
- pattern : data pattern to create file.
- Returns:
None
"""
pattern_len = len(pattern)
data_file = open(pathname, "w")
for i in range(0, data_size):
data_file.write(pattern[i % pattern_len])
data_file.flush()
os.fsync(data_file.fileno())
data_file.close()
def nvme_write(self):
""" Wrapper for nvme write operation
- Args:
- None
- Returns:
- return code for nvme write command.
"""
write_cmd = "nvme write " + self.ns1 + " --start-block=" + \
str(self.start_block) + " --block-count=" + \
str(self.block_count) + " --data-size=" + \
str(self.data_size) + " --data=" + self.write_file
return self.exec_cmd(write_cmd)
def nvme_read(self):
""" Wrapper for nvme read operation
- Args:
- None
- Returns:
- return code for nvme read command.
"""
read_cmd = "nvme read " + self.ns1 + " --start-block=" + \
str(self.start_block) + " --block-count=" + \
str(self.block_count) + " --data-size=" + \
str(self.data_size) + " --data=" + self.read_file
print(read_cmd)
return self.exec_cmd(read_cmd)
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