Mikio Hara
108 lines
4.1 KiB
C
108 lines
4.1 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef PORT_ARRAY_H
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#define PORT_ARRAY_H 1
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#include <assert.h>
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#include "openflow/openflow.h"
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#include "util.h"
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static inline uint16_t
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port_array_extract_bits__(uint16_t data, int start, int count)
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{
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return (data >> start) & ((1u << count) - 1);
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}
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/* Level 1: most-significant bits. */
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#define PORT_ARRAY_L1_BITS 5
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#define PORT_ARRAY_L1_SHIFT (PORT_ARRAY_L3_BITS + PORT_ARRAY_L2_BITS)
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#define PORT_ARRAY_L1_SIZE (1u << PORT_ARRAY_L1_BITS)
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#define PORT_ARRAY_L1(IDX) \
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port_array_extract_bits__(IDX, PORT_ARRAY_L1_SHIFT, PORT_ARRAY_L1_BITS)
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/* Level 2: middle bits. */
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#define PORT_ARRAY_L2_BITS 5
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#define PORT_ARRAY_L2_SHIFT PORT_ARRAY_L3_BITS
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#define PORT_ARRAY_L2_SIZE (1u << PORT_ARRAY_L2_BITS)
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#define PORT_ARRAY_L2(IDX) \
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port_array_extract_bits__(IDX, PORT_ARRAY_L2_SHIFT, PORT_ARRAY_L2_BITS)
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/* Level 3: least-significant bits. */
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#define PORT_ARRAY_L3_BITS 6
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#define PORT_ARRAY_L3_SHIFT 0
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#define PORT_ARRAY_L3_SIZE (1u << PORT_ARRAY_L3_BITS)
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#define PORT_ARRAY_L3(IDX) \
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port_array_extract_bits__(IDX, PORT_ARRAY_L3_SHIFT, PORT_ARRAY_L3_BITS)
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#define PORT_ARRAY_SIZE (1u << (PORT_ARRAY_L1_BITS \
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+ PORT_ARRAY_L2_BITS \
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+ PORT_ARRAY_L3_BITS))
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BUILD_ASSERT_DECL(PORT_ARRAY_SIZE > 0xffff);
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/* A "sparse array" of up to 65536 elements (numbered 0...65535), implemented
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* as a 3-level trie. Most efficient when the elements are clustered
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* together. */
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struct port_array {
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struct port_array_l2 *l1[1u << PORT_ARRAY_L1_BITS];
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};
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struct port_array_l2 {
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struct port_array_l3 *l2[1u << PORT_ARRAY_L2_BITS];
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};
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struct port_array_l3 {
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void *l3[1u << PORT_ARRAY_L3_BITS];
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};
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/* Returns the value of the element numbered 'idx' in 'pa', or a null pointer
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* if no element numbered 'idx' has been set. */
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static inline void *
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port_array_get(const struct port_array *pa, uint16_t idx)
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{
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unsigned int l1_idx = PORT_ARRAY_L1(idx);
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unsigned int l2_idx = PORT_ARRAY_L2(idx);
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unsigned int l3_idx = PORT_ARRAY_L3(idx);
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return pa->l1[l1_idx]->l2[l2_idx]->l3[l3_idx];
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}
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void port_array_init(struct port_array *);
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void port_array_destroy(struct port_array *);
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void port_array_clear(struct port_array *);
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void port_array_set(struct port_array *, uint16_t idx, void *);
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void *port_array_first(const struct port_array *, unsigned int *);
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void *port_array_next(const struct port_array *, unsigned int *);
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#endif /* port-array.h */
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