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41 lines
893 B
C
41 lines
893 B
C
/*-
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* Copyright (c) 2018 VMware, Inc.
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*
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* SPDX-License-Identifier: (BSD-2-Clause OR GPL-2.0)
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*/
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/* Some common utilities used by the VMCI kernel module. */
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#ifndef _VMCI_UTILS_H_
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#define _VMCI_UTILS_H_
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/*
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*------------------------------------------------------------------------------
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*
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* vmci_hash_id --
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*
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* Hash function used by the Simple Datagram API. Hashes only a VMCI ID (not
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* the full VMCI handle). Based on the djb2 hash function by Dan Bernstein.
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*
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* Result:
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* Returns guest call size.
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*
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* Side effects:
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* None.
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*
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*------------------------------------------------------------------------------
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*/
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static inline int
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vmci_hash_id(vmci_id id, unsigned size)
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{
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unsigned i;
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int hash = 5381;
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for (i = 0; i < sizeof(id); i++)
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hash = ((hash << 5) + hash) + (uint8_t)(id >> (i * 8));
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return (hash & (size - 1));
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}
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#endif /* !_VMCI_UTILS_H_ */
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