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				/*-
				* Copyright (c) 2018 VMware, Inc. All Rights Reserved.
				*
				* SPDX-License-Identifier: (BSD-2-Clause AND GPL-2.0)
				*/

				/* Some common utilities used by the VMCI kernel module. */

				#ifndef _VMCI_UTILS_H_
				#define _VMCI_UTILS_H_

				/*
				*------------------------------------------------------------------------------
				*
				* vmci_hash_id --
				*
				* Hash function used by the Simple Datagram API. Hashes only a VMCI ID (not
				* the full VMCI handle). Based on the djb2 hash function by Dan Bernstein.
				*
				* Result:
				* Returns guest call size.
				*
				* Side effects:
				* None.
				*
				*------------------------------------------------------------------------------
				*/

				static inline int
				vmci_hash_id(vmci_id id, unsigned size)
				{
				unsigned i;
				int hash = 5381;

				for (i = 0; i < sizeof(id); i++)
				hash = ((hash << 5) + hash) + (uint8_t)(id >> (i * 8));

				return (hash & (size - 1));
				}

				#endif /* !_VMCI_UTILS_H_ */