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scsi: core: Add kunit tests for scsi_check_passthrough()

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Add some kunit tests for scsi_check_passthrough() so we can easily make
sure we are hitting the cases for which it's difficult to replicate in
hardware or even scsi_debug.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20240123002220.129141-20-michael.christie@oracle.com
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2024-01-22 18:22:20 -06:00 committed by Martin K. Petersen
parent b8c3a7bac9
commit 25a1f7a0a1
3 changed files with 343 additions and 0 deletions
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9
drivers/scsi/Kconfig
View File

@ -67,6 +67,15 @@ config SCSI_PROC_FS
If unsure say Y.
config SCSI_LIB_KUNIT_TEST
tristate "KUnit tests for SCSI Mid Layer's scsi_lib" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Run SCSI Mid Layer's KUnit tests for scsi_lib.
If unsure say N.
comment "SCSI support type (disk, tape, CD-ROM)"
depends on SCSI

4
drivers/scsi/scsi_lib.c
View File

@ -3434,3 +3434,7 @@ void scsi_build_sense(struct scsi_cmnd *scmd, int desc, u8 key, u8 asc, u8 ascq)
scmd->result = SAM_STAT_CHECK_CONDITION;
}
EXPORT_SYMBOL_GPL(scsi_build_sense);
#ifdef CONFIG_SCSI_KUNIT_TEST
#include "scsi_lib_test.c"
#endif

330
drivers/scsi/scsi_lib_test.c Normal file
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@ -0,0 +1,330 @@
// SPDX-License-Identifier: GPL-2.0
/*
* KUnit tests for scsi_lib.c.
*
* Copyright (C) 2023, Oracle Corporation
*/
#include <kunit/test.h>
#include <scsi/scsi_proto.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#define SCSI_LIB_TEST_MAX_ALLOWED 3
#define SCSI_LIB_TEST_TOTAL_MAX_ALLOWED 5
static void scsi_lib_test_multiple_sense(struct kunit *test)
{
struct scsi_failure multiple_sense_failure_defs[] = {
{
.sense = DATA_PROTECT,
.asc = 0x1,
.ascq = 0x1,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = UNIT_ATTENTION,
.asc = 0x11,
.ascq = 0x0,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = NOT_READY,
.asc = 0x11,
.ascq = 0x22,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = ABORTED_COMMAND,
.asc = 0x11,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = HARDWARE_ERROR,
.asc = SCMD_FAILURE_ASC_ANY,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = ILLEGAL_REQUEST,
.asc = 0x91,
.ascq = 0x36,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = multiple_sense_failure_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
int i;
/* Match end of array */
scsi_build_sense(&sc, 0, ILLEGAL_REQUEST, 0x91, 0x36);
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
/* Basic match in array */
scsi_build_sense(&sc, 0, UNIT_ATTENTION, 0x11, 0x0);
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
/* No matching sense entry */
scsi_build_sense(&sc, 0, MISCOMPARE, 0x11, 0x11);
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
/* Match using SCMD_FAILURE_ASCQ_ANY */
scsi_build_sense(&sc, 0, ABORTED_COMMAND, 0x11, 0x22);
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
/* Fail to match */
scsi_build_sense(&sc, 0, ABORTED_COMMAND, 0x22, 0x22);
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
/* Match using SCMD_FAILURE_ASC_ANY */
scsi_build_sense(&sc, 0, HARDWARE_ERROR, 0x11, 0x22);
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
/* No matching status entry */
sc.result = SAM_STAT_RESERVATION_CONFLICT;
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
/* Test hitting allowed limit */
scsi_build_sense(&sc, 0, NOT_READY, 0x11, 0x22);
for (i = 0; i < SCSI_LIB_TEST_MAX_ALLOWED; i++)
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc,
&failures));
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
/* reset retries so we can retest */
failures.failure_definitions = multiple_sense_failure_defs;
scsi_failures_reset_retries(&failures);
/* Test no retries allowed */
scsi_build_sense(&sc, 0, DATA_PROTECT, 0x1, 0x1);
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_any_sense(struct kunit *test)
{
struct scsi_failure any_sense_failure_defs[] = {
{
.result = SCMD_FAILURE_SENSE_ANY,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = any_sense_failure_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
/* Match using SCMD_FAILURE_SENSE_ANY */
failures.failure_definitions = any_sense_failure_defs;
scsi_build_sense(&sc, 0, MEDIUM_ERROR, 0x11, 0x22);
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_host(struct kunit *test)
{
struct scsi_failure retryable_host_failure_defs[] = {
{
.result = DID_TRANSPORT_DISRUPTED << 16,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
},
{
.result = DID_TIME_OUT << 16,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = retryable_host_failure_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
/* No matching host byte entry */
failures.failure_definitions = retryable_host_failure_defs;
sc.result = DID_NO_CONNECT << 16;
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
/* Matching host byte entry */
sc.result = DID_TIME_OUT << 16;
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_any_failure(struct kunit *test)
{
struct scsi_failure any_failure_defs[] = {
{
.result = SCMD_FAILURE_RESULT_ANY,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = any_failure_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
/* Match SCMD_FAILURE_RESULT_ANY */
failures.failure_definitions = any_failure_defs;
sc.result = DID_TRANSPORT_FAILFAST << 16;
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_any_status(struct kunit *test)
{
struct scsi_failure any_status_failure_defs[] = {
{
.result = SCMD_FAILURE_STAT_ANY,
.allowed = SCSI_LIB_TEST_MAX_ALLOWED,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = any_status_failure_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
/* Test any status handling */
failures.failure_definitions = any_status_failure_defs;
sc.result = SAM_STAT_RESERVATION_CONFLICT;
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_total_allowed(struct kunit *test)
{
struct scsi_failure total_allowed_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Fail all CCs except the UA above */
{
.sense = SCMD_FAILURE_SENSE_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Retry any other errors not listed above */
{
.result = SCMD_FAILURE_RESULT_ANY,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = total_allowed_defs,
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
int i;
/* Test total_allowed */
failures.failure_definitions = total_allowed_defs;
scsi_failures_reset_retries(&failures);
failures.total_allowed = SCSI_LIB_TEST_TOTAL_MAX_ALLOWED;
scsi_build_sense(&sc, 0, UNIT_ATTENTION, 0x28, 0x0);
for (i = 0; i < SCSI_LIB_TEST_TOTAL_MAX_ALLOWED; i++)
/* Retry since we under the total_allowed limit */
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc,
&failures));
sc.result = DID_TIME_OUT << 16;
/* We have now hit the total_allowed limit so no more retries */
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_mixed_total(struct kunit *test)
{
struct scsi_failure mixed_total_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = 0x28,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = UNIT_ATTENTION,
.asc = 0x29,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.allowed = 1,
.result = DID_TIME_OUT << 16,
},
{}
};
u8 sense[SCSI_SENSE_BUFFERSIZE] = {};
struct scsi_failures failures = {
.failure_definitions = mixed_total_defs,
};
struct scsi_cmnd sc = {
.sense_buffer = sense,
};
int i;
/*
* Test total_allowed when there is a mix of per failure allowed
* and total_allowed limits.
*/
failures.failure_definitions = mixed_total_defs;
scsi_failures_reset_retries(&failures);
failures.total_allowed = SCSI_LIB_TEST_TOTAL_MAX_ALLOWED;
scsi_build_sense(&sc, 0, UNIT_ATTENTION, 0x28, 0x0);
for (i = 0; i < SCSI_LIB_TEST_TOTAL_MAX_ALLOWED; i++)
/* Retry since we under the total_allowed limit */
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc,
&failures));
/* Do not retry since we are now over total_allowed limit */
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
scsi_failures_reset_retries(&failures);
scsi_build_sense(&sc, 0, UNIT_ATTENTION, 0x28, 0x0);
for (i = 0; i < SCSI_LIB_TEST_TOTAL_MAX_ALLOWED; i++)
/* Retry since we under the total_allowed limit */
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc,
&failures));
sc.result = DID_TIME_OUT << 16;
/* Retry because this failure has a per failure limit */
KUNIT_EXPECT_EQ(test, -EAGAIN, scsi_check_passthrough(&sc, &failures));
scsi_build_sense(&sc, 0, UNIT_ATTENTION, 0x29, 0x0);
/* total_allowed is now hit so no more retries */
KUNIT_EXPECT_EQ(test, 0, scsi_check_passthrough(&sc, &failures));
}
static void scsi_lib_test_check_passthough(struct kunit *test)
{
scsi_lib_test_multiple_sense(test);
scsi_lib_test_any_sense(test);
scsi_lib_test_host(test);
scsi_lib_test_any_failure(test);
scsi_lib_test_any_status(test);
scsi_lib_test_total_allowed(test);
scsi_lib_test_mixed_total(test);
}
static struct kunit_case scsi_lib_test_cases[] = {
KUNIT_CASE(scsi_lib_test_check_passthough),
{}
};
static struct kunit_suite scsi_lib_test_suite = {
.name = "scsi_lib",
.test_cases = scsi_lib_test_cases,
};
kunit_test_suite(scsi_lib_test_suite);