qcacmn: Add qdf hashtable APIs

Add a thin wrapper in QDF around the kernel hashtable implementation.
Additionally, add basic unit tests for these APIs.

Change-Id: I07999e5fc8116e67b3850b866ced20af64342055
CRs-Fixed: 2359335

qdf/linux/src/i_qdf_hashtable.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __I_QDF_HASHTABLE_H
+#define __I_QDF_HASHTABLE_H
+
+#include "linux/hashtable.h"
+
+#define __qdf_ht hlist_head
+#define __qdf_ht_entry hlist_node
+#define __qdf_ht_declare(name, bits) DECLARE_HASHTABLE(name, bits)
+#define __qdf_ht_init(table) hash_init(table)
+#define __qdf_ht_deinit(table) do { } while (false)
+#define __qdf_ht_empty(table) hash_empty(table)
+#define __qdf_ht_add(table, entry, key) hash_add(table, entry, key)
+#define __qdf_ht_remove(entry) hash_del(entry)
+
+#define __qdf_ht_for_each(table, i, cursor, entry_field) \
+	hash_for_each(table, i, cursor, entry_field)
+
+#define __qdf_ht_for_each_in_bucket(table, cursor, entry_field, key) \
+	hash_for_each_possible(table, cursor, entry_field, key)
+
+#define __qdf_ht_for_each_match(table, cursor, entry_field, key, key_field) \
+	hash_for_each_possible(table, (cursor), entry_field, (key)) \
+		if ((cursor)->key_field == (key))
+
+#define __qdf_ht_get(table, cursor, entry_field, key, key_field) \
+do { \
+	cursor = NULL; \
+	__qdf_ht_for_each_match(table, cursor, entry_field, key, key_field) \
+		break; \
+} while (false)
+
+#endif /* __I_QDF_HASHTABLE_H */