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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>
+#
+"""
+NVMe Write Zeros:-
+
+ 1. Issue a write command to block of data.
+ 2. Read from same block to verify data pattern.
+ 3. Issue write zeros to the block of data.
+ 4. Read from same block, should be all zeroes.
+
+"""
+
+import filecmp
+
+from nvme_test_io import TestNVMeIO
+
+
+class TestNVMeWriteZeros(TestNVMeIO):
+
+ """
+ Represents NVMe Write Zero Testcase.
+
+ - Attributes:
+ - zero_file : file with all '\0' to compare the zero data.
+ - data_size : data size to perform IO.
+ - start_block : starting block of to perform IO.
+ - block_count: Number of blocks to use in IO.
+ - test_log_dir : directory for logs, temp files.
+ """
+
+ def setUp(self):
+ """ Pre Section for TestNVMeWriteZeros """
+ super().setUp()
+ self.start_block = 1023
+ self.block_count = 0
+ self.setup_log_dir(self.__class__.__name__)
+ self.write_file = self.test_log_dir + "/" + self.write_file
+ self.read_file = self.test_log_dir + "/" + self.read_file
+ self.zero_file = self.test_log_dir + "/" + "zero_file.txt"
+ self.create_data_file(self.write_file, self.data_size, "15")
+ self.create_data_file(self.zero_file, self.data_size, '\0')
+ open(self.read_file, 'a').close()
+
+ def tearDown(self):
+ """ Post Section for TestNVMeWriteZeros """
+ super().tearDown()
+
+ def write_zeroes(self):
+ """ Wrapper for nvme write-zeroe
+ - Args:
+ - None
+ - Returns:
+ - return code for nvme write command.
+ """
+ write_zeroes_cmd = "nvme write-zeroes " + self.ns1 + \
+ " --start-block=" + str(self.start_block) + \
+ " --block-count=" + str(self.block_count)
+ return self.exec_cmd(write_zeroes_cmd)
+
+ def validate_write_read(self):
+ """ Validate the file which had been read from the device
+ - Args:
+ - None
+ - Returns:
+ - 0 on success, 1 on failure
+ """
+ return 0 if filecmp.cmp(self.write_file, self.read_file) is True else 1
+
+ def validate_zeroes(self):
+ """
+ Validate the data which is zeroed out via write-zeroes
+ - Args:
+ - None
+ - Returns:
+ - 0 on success, 1 on failure
+ """
+ return 0 if filecmp.cmp(self.zero_file, self.read_file) is True else 1
+
+ def test_write_zeros(self):
+ """ Testcae main """
+ self.assertEqual(self.nvme_write(), 0)
+ self.assertEqual(self.nvme_read(), 0)
+ self.assertEqual(self.validate_write_read(), 0)
+ self.assertEqual(self.write_zeroes(), 0)
+ self.assertEqual(self.nvme_read(), 0)
+ self.assertEqual(self.validate_zeroes(), 0)