Kunit tests to test hash table add, delete, duplicate add and delete.
Add following configs and compile kernel code:

CONFIG_CONNECTOR=y
CONFIG_PROC_EVENTS=y
CONFIG_NET=y
CONFIG_KUNIT=m
CONFIG_CN_HASH_KUNIT_TEST=m

To run kunit tests:
sudo modprobe cn_hash_test

Output of kunit tests and hash table contents are displayed in
/var/log/messages (at KERN_DEBUG level).

Signed-off-by: Anjali Kulkarni <anjali.k.kulkarni@oracle.com>
---
 drivers/connector/cn_hash.c                  |  40 +++++
 drivers/connector/connector.c                |  12 ++
 include/linux/connector.h                    |   4 +
 lib/Kconfig.debug                            |  19 +++
 lib/Makefile                                 |   1 +
 lib/cn_hash_test.c                           | 169 +++++++++++++++++++
 lib/cn_hash_test.h                           |  10 ++
 tools/testing/kunit/configs/all_tests.config |   5 +
 8 files changed, 260 insertions(+)
 create mode 100644 lib/cn_hash_test.c
 create mode 100644 lib/cn_hash_test.h

diff --git a/drivers/connector/cn_hash.c b/drivers/connector/cn_hash.c
index b94f6c461496..a8b8760c2e8c 100644
--- a/drivers/connector/cn_hash.c
+++ b/drivers/connector/cn_hash.c
@@ -165,6 +165,46 @@ int cn_hash_get_exval(struct cn_hash_dev *hdev, pid_t pid)
 	return -EINVAL;
 }
 
+int cn_hash_display_hlist(struct cn_hash_dev *hdev, pid_t pid, int max_len,
+			  int *hkey, int *key_display)
+{
+	struct uexit_pid_hnode *hnode;
+	int key, count = 0;
+
+	mutex_lock(&hdev->uexit_hash_lock);
+	key = hash_min(pid, HASH_BITS(hdev->uexit_pid_htable));
+	pr_debug("Bucket: %d\n", key);
+
+	hlist_for_each_entry(hnode,
+			     &hdev->uexit_pid_htable[key],
+			     uexit_pid_hlist) {
+		if (key_display[key] != 1) {
+			if (!hnode->uexit_pid_hlist.next)
+				pr_debug("pid %d ", hnode->pid);
+			else
+				pr_debug("pid %d --> ", hnode->pid);
+		}
+		count++;
+	}
+
+	mutex_unlock(&hdev->uexit_hash_lock);
+
+	if (key_display[key] != 1 && !count)
+		pr_debug("(empty)\n");
+
+	pr_debug("\n");
+
+	*hkey = key;
+
+	if (count > max_len) {
+		pr_err("%d entries in hlist for key %d, expected %d\n",
+		       count, key, max_len);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 bool cn_hash_table_empty(struct cn_hash_dev *hdev)
 {
 	bool is_empty;
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 2494a443fbd6..9b0cbe134e87 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -304,6 +304,18 @@ int cn_get_exval(pid_t pid)
 }
 EXPORT_SYMBOL_GPL(cn_get_exval);
 
+int cn_display_hlist(pid_t pid, int max_len, int *hkey, int *key_display)
+{
+	struct cn_dev *dev = &cdev;
+
+	if (!cn_already_initialized)
+		return 0;
+
+	return cn_hash_display_hlist(dev->hdev, pid, max_len,
+					hkey, key_display);
+}
+EXPORT_SYMBOL_GPL(cn_display_hlist);
+
 bool cn_table_empty(void)
 {
 	struct cn_dev *dev = &cdev;
diff --git a/include/linux/connector.h b/include/linux/connector.h
index 3f0648c886bc..393e1a391b70 100644
--- a/include/linux/connector.h
+++ b/include/linux/connector.h
@@ -173,4 +173,8 @@ int cn_get_exval(pid_t pid);
 bool cn_table_empty(void);
 bool cn_hash_table_empty(struct cn_hash_dev *hdev);
 
+int cn_display_hlist(pid_t pid, int max_len, int *hkey, int *key_display);
+int cn_hash_display_hlist(struct cn_hash_dev *hdev, pid_t pid, int max_len,
+			  int *hkey, int *key_display);
+
 #endif				/* __CONNECTOR_H */
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7315f643817a..784bd66221ab 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2705,6 +2705,25 @@ config HASHTABLE_KUNIT_TEST
 
 	  If unsure, say N.
 
+config CN_HASH_KUNIT_TEST
+	tristate "KUnit Test for connector hashtable code" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	depends on CONNECTOR && PROC_EVENTS
+	depends on NET
+	default KUNIT_ALL_TESTS
+	help
+	  This builds the hashtable KUnit test suite.
+	  It tests the basic functionality of the API defined in
+	  drivers/connector/cn_hash.c.
+	  CONFIG_CONNECTOR=y, CONFIG_PROC_EVENTS=y and CONFIG_NET=y needs
+	  to be enabled along with CONFIG_CN_HASH_KUNIT_TEST=m and
+	  CONFIG_KUNIT=m in .config file to compile and then test as a
+	  kernel module with "modprobe cn_hash_test".
+	  For more information on KUnit and unit tests in general please
+	  refer to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
+
 config LINEAR_RANGES_TEST
 	tristate "KUnit test for linear_ranges"
 	depends on KUNIT
diff --git a/lib/Makefile b/lib/Makefile
index 811ba12c8cd0..2c59c82b0b18 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -379,6 +379,7 @@ obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
 obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
 obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
 obj-$(CONFIG_IS_SIGNED_TYPE_KUNIT_TEST) += is_signed_type_kunit.o
+obj-$(CONFIG_CN_HASH_KUNIT_TEST) += cn_hash_test.o
 CFLAGS_overflow_kunit.o = $(call cc-disable-warning, tautological-constant-out-of-range-compare)
 obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
 CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable)
diff --git a/lib/cn_hash_test.c b/lib/cn_hash_test.c
new file mode 100644
index 000000000000..efaf727d9b2a
--- /dev/null
+++ b/lib/cn_hash_test.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for the connector threads hashtable code.
+ *
+ * Copyright (c) 2024 Oracle and/or its affiliates.
+ * Author: Anjali Kulkarni <anjali.k.kulkarni@oracle.com>
+ */
+#include <kunit/test.h>
+
+#include "cn_hash_test.h"
+
+#define ARR_SIZE	4
+#define HASH_TABLE_LEN	1024
+
+struct add_data {
+	pid_t pid;
+	int exit_val;
+	int key;
+};
+
+static struct add_data adata[ARR_SIZE];
+static int key_display[HASH_TABLE_LEN];
+
+static int cn_hash_init(struct kunit *test)
+{
+	for (int i = 0; i < HASH_TABLE_LEN; i++)
+		key_display[i] = 0;
+
+	return 0;
+}
+
+static void cn_display_htable(struct kunit *test, int len)
+{
+	int i, err;
+
+	cn_hash_init(test);
+
+	pr_debug("\n");
+	pr_debug("Displaying hash table:\n");
+
+	for (i = 0; i < len; i++) {
+		err = cn_display_hlist(adata[i].pid, len, &adata[i].key,
+				       key_display);
+		key_display[adata[i].key] = 1;
+		KUNIT_EXPECT_EQ(test, err, 0);
+	}
+}
+
+static void cn_hash_test_add(struct kunit *test)
+{
+	int err, i;
+	int exit_val;
+
+	adata[0].pid = 1;
+	adata[0].exit_val = 45;
+
+	adata[1].pid = 2;
+	adata[1].exit_val = 13;
+
+	adata[2].pid = 1024;
+	adata[2].exit_val = 16;
+
+	adata[3].pid = 1023;
+	adata[3].exit_val = 71;
+
+	for (i = 0; i < ARRAY_SIZE(adata); i++) {
+		err = cn_add_elem(adata[i].exit_val, adata[i].pid);
+		KUNIT_EXPECT_EQ_MSG(test, 0, err,
+				    "Adding pid %d returned err %d",
+				    adata[i].pid, err);
+
+		exit_val = cn_get_exval(adata[i].pid);
+		KUNIT_EXPECT_EQ(test, adata[i].exit_val, exit_val);
+	}
+
+	cn_display_htable(test, ARRAY_SIZE(adata));
+}
+
+static void cn_hash_test_del(struct kunit *test)
+{
+	int i, err;
+	int exit_val;
+
+	for (i = 0; i < ARRAY_SIZE(adata); i++) {
+		err = cn_del_get_exval(adata[i].pid);
+		KUNIT_EXPECT_GT_MSG(test, err, 0,
+				    "Deleting pid %d returned err %d",
+				    adata[i].pid, err);
+
+		exit_val = cn_get_exval(adata[i].pid);
+		KUNIT_EXPECT_EQ(test, -EINVAL, exit_val);
+	}
+
+	cn_display_htable(test, ARRAY_SIZE(adata));
+	KUNIT_EXPECT_TRUE(test, cn_table_empty());
+}
+
+static void cn_hash_test_del_get_exval(struct kunit *test)
+{
+	int i, exval;
+
+	for (i = 0; i < ARRAY_SIZE(adata); i++) {
+		exval = cn_del_get_exval(adata[i].pid);
+		KUNIT_EXPECT_EQ(test, adata[i].exit_val, exval);
+
+		cn_display_htable(test, ARRAY_SIZE(adata));
+	}
+
+	KUNIT_EXPECT_TRUE(test, cn_table_empty());
+}
+
+static void cn_hash_test_dup_add(struct kunit *test)
+{
+	int err, exit_val;
+
+	adata[0].pid = 10;
+	adata[0].exit_val = 21;
+
+	err = cn_add_elem(adata[0].exit_val, adata[0].pid);
+	KUNIT_EXPECT_EQ(test, 0, err);
+
+	exit_val = cn_get_exval(adata[0].pid);
+	KUNIT_EXPECT_EQ(test, 21, exit_val);
+
+	adata[1].pid = 10;
+	adata[1].exit_val = 12;
+
+	err = cn_add_elem(adata[1].exit_val, adata[1].pid);
+	KUNIT_EXPECT_EQ(test, -EEXIST, err);
+
+	exit_val = cn_get_exval(adata[1].pid);
+	KUNIT_EXPECT_EQ(test, 21, exit_val);
+
+	cn_display_htable(test, 1);
+}
+
+static void cn_hash_test_dup_del(struct kunit *test)
+{
+	int err;
+
+	err = cn_del_get_exval(adata[0].pid);
+	KUNIT_EXPECT_EQ(test, adata[0].exit_val, err);
+
+	err = cn_del_get_exval(adata[0].pid);
+	KUNIT_EXPECT_EQ(test, -EINVAL, err);
+
+	KUNIT_EXPECT_TRUE(test, cn_table_empty());
+}
+
+static struct kunit_case cn_hashtable_test_cases[] = {
+	KUNIT_CASE(cn_hash_test_add),
+	KUNIT_CASE(cn_hash_test_del),
+	KUNIT_CASE(cn_hash_test_dup_add),
+	KUNIT_CASE(cn_hash_test_dup_del),
+	KUNIT_CASE(cn_hash_test_add),
+	KUNIT_CASE(cn_hash_test_del_get_exval),
+	{},
+};
+
+static struct kunit_suite cn_hashtable_test_module = {
+	.name = "cn_hashtable",
+	.init = cn_hash_init,
+	.test_cases = cn_hashtable_test_cases,
+};
+
+kunit_test_suite(cn_hashtable_test_module);
+
+MODULE_DESCRIPTION("KUnit test for the connector threads hashtable code");
+MODULE_LICENSE("GPL");
diff --git a/lib/cn_hash_test.h b/lib/cn_hash_test.h
new file mode 100644
index 000000000000..b25033feab09
--- /dev/null
+++ b/lib/cn_hash_test.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates.
+ * Author: Anjali Kulkarni <anjali.k.kulkarni@oracle.com>
+ */
+int cn_display_hlist(pid_t pid, int max_len, int *hkey, int *key_display);
+int cn_add_elem(__u32 uexit_code, pid_t pid);
+int cn_del_get_exval(pid_t pid);
+int cn_get_exval(pid_t pid);
+bool cn_table_empty(void);
diff --git a/tools/testing/kunit/configs/all_tests.config b/tools/testing/kunit/configs/all_tests.config
index b3b00269a52a..a663280b0f3a 100644
--- a/tools/testing/kunit/configs/all_tests.config
+++ b/tools/testing/kunit/configs/all_tests.config
@@ -52,3 +52,8 @@ CONFIG_SOUND=y
 CONFIG_SND=y
 CONFIG_SND_SOC=y
 CONFIG_SND_SOC_TOPOLOGY_BUILD=y
+
+CONFIG_CONNECTOR=y
+CONFIG_PROC_EVENTS=y
+CONFIG_NET=y
+CONFIG_CN_HASH_KUNIT_TEST=y
-- 
2.46.0