+++ /dev/null
-/*
- * Copyright (c) 2008, 2010 Nicira Networks.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <config.h>
-#include "port-array.h"
-#include <stdlib.h>
-
-static struct port_array_l2 l2_sentinel;
-static struct port_array_l3 l3_sentinel;
-static bool inited;
-
-/* Initializes 'pa' as an empty port_array. */
-void
-port_array_init(struct port_array *pa)
-{
- size_t i;
- if (!inited) {
- inited = true;
- for (i = 0; i < PORT_ARRAY_L2_SIZE; i++) {
- l2_sentinel.l2[i] = &l3_sentinel;
- }
- }
- for (i = 0; i < PORT_ARRAY_L1_SIZE; i++) {
- pa->l1[i] = &l2_sentinel;
- }
-}
-
-/* Frees all the memory allocated for 'pa'. It is the client's responsibility
- * to free memory that 'pa' elements point to. */
-void
-port_array_destroy(struct port_array *pa)
-{
- unsigned int l1_idx;
-
- for (l1_idx = 0; l1_idx < PORT_ARRAY_L1_SIZE; l1_idx++) {
- struct port_array_l2 *l2 = pa->l1[l1_idx];
-
- if (l2 != &l2_sentinel) {
- unsigned int l2_idx;
-
- for (l2_idx = 0; l2_idx < PORT_ARRAY_L2_SIZE; l2_idx++) {
- struct port_array_l3 *l3 = l2->l2[l2_idx];
- if (l3 != &l3_sentinel) {
- free(l3);
- }
- }
- free(l2);
- }
- }
-}
-
-/* Clears all elements of 'pa' to null pointers. */
-void
-port_array_clear(struct port_array *pa)
-{
- port_array_destroy(pa);
- port_array_init(pa);
-}
-
-/* Sets 'pa' element numbered 'idx' to 'p'. */
-void
-port_array_set(struct port_array *pa, uint16_t idx, void *p)
-{
- struct port_array_l2 **l2p, *l2;
- struct port_array_l3 **l3p, *l3;
-
- /* Traverse level 1. */
- l2p = &pa->l1[PORT_ARRAY_L1(idx)];
- if (*l2p == &l2_sentinel) {
- *l2p = xmemdup(&l2_sentinel, sizeof l2_sentinel);
- }
- l2 = *l2p;
-
- /* Traverse level 2. */
- l3p = &l2->l2[PORT_ARRAY_L2(idx)];
- if (*l3p == &l3_sentinel) {
- *l3p = xmemdup(&l3_sentinel, sizeof l3_sentinel);
- }
- l3 = *l3p;
-
- /* Set level 3. */
- l3->l3[PORT_ARRAY_L3(idx)] = p;
-}
-
-/* Sets 'pa' element numbered 'idx' to NULL. */
-void
-port_array_delete(struct port_array *pa, uint16_t idx)
-{
- unsigned int l1_idx = PORT_ARRAY_L1(idx);
- unsigned int l2_idx = PORT_ARRAY_L2(idx);
- unsigned int l3_idx = PORT_ARRAY_L3(idx);
-
- pa->l1[l1_idx]->l2[l2_idx]->l3[l3_idx] = NULL;
-}
-
-static void *
-next(const struct port_array *pa, unsigned int *idxp)
-{
- unsigned int idx = *idxp;
-
- /* Using shift-right directly here, instead of PORT_ARRAY_L1(idx), ensures
- * that with an initially too-big value of '*idxp' we will skip the outer
- * loop and return NULL. */
- unsigned int l1_idx = idx >> PORT_ARRAY_L1_SHIFT;
- unsigned int l2_idx = PORT_ARRAY_L2(idx);
- unsigned int l3_idx = PORT_ARRAY_L3(idx);
- while (l1_idx < PORT_ARRAY_L1_SIZE) {
- struct port_array_l2 *l2 = pa->l1[l1_idx];
- if (l2 != &l2_sentinel) {
- while (l2_idx < PORT_ARRAY_L2_SIZE) {
- struct port_array_l3 *l3 = l2->l2[l2_idx];
- if (l3 != &l3_sentinel) {
- while (l3_idx < PORT_ARRAY_L3_SIZE) {
- void *p = l3->l3[l3_idx];
- if (p) {
- *idxp = ((l1_idx << PORT_ARRAY_L1_SHIFT)
- | (l2_idx << PORT_ARRAY_L2_SHIFT)
- | (l3_idx << PORT_ARRAY_L3_SHIFT));
- return p;
- }
- l3_idx++;
- }
- }
- l2_idx++;
- l3_idx = 0;
- }
- }
- l1_idx++;
- l2_idx = 0;
- l3_idx = 0;
- }
- *idxp = PORT_ARRAY_SIZE;
- return NULL;
-}
-
-/* Returns the value of the lowest-numbered non-empty element of 'pa', and sets
- * '*idxp' to that element's index. If 'pa' is entirely empty, returns a null
- * pointer and sets '*idxp' to 65536. */
-void *
-port_array_first(const struct port_array *pa, unsigned int *idxp)
-{
- *idxp = 0;
- return next(pa, idxp);
-}
-
-/* Returns the value of the lowest-numbered non-empty element of 'pa' greater
- * than the initial value of '*idxp', and sets '*idxp' to that element's index.
- * If 'pa' contains no non-empty elements with indexes greater than the initial
- * value of '*idxp', returns a null pointer and sets '*idxp' to 65536. */
-void *
-port_array_next(const struct port_array *pa, unsigned int *idxp)
-{
- ++*idxp;
- return next(pa, idxp);
-}
-
-/* Returns the number of non-null elements of 'pa'. */
-unsigned int
-port_array_count(const struct port_array *pa)
-{
- unsigned int l1_idx, l2_idx, l3_idx;
- unsigned int count;
-
- count = 0;
- for (l1_idx = 0; l1_idx < PORT_ARRAY_L1_SIZE; l1_idx++) {
- struct port_array_l2 *l2 = pa->l1[l1_idx];
- if (l2 != &l2_sentinel) {
- for (l2_idx = 0; l2_idx < PORT_ARRAY_L2_SIZE; l2_idx++) {
- struct port_array_l3 *l3 = l2->l2[l2_idx];
- if (l3 != &l3_sentinel) {
- for (l3_idx = 0; l3_idx < PORT_ARRAY_L3_SIZE; l3_idx++) {
- if (l3->l3[l3_idx]) {
- count++;
- }
- }
- }
- }
- }
- }
- return count;
-}
+++ /dev/null
-/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef PORT_ARRAY_H
-#define PORT_ARRAY_H 1
-
-#include <assert.h>
-#include "openflow/openflow.h"
-#include "util.h"
-
-static inline uint16_t
-port_array_extract_bits__(uint16_t data, int start, int count)
-{
- return (data >> start) & ((1u << count) - 1);
-}
-
-/* Level 1: most-significant bits. */
-#define PORT_ARRAY_L1_BITS 5
-#define PORT_ARRAY_L1_SHIFT (PORT_ARRAY_L3_BITS + PORT_ARRAY_L2_BITS)
-#define PORT_ARRAY_L1_SIZE (1u << PORT_ARRAY_L1_BITS)
-#define PORT_ARRAY_L1(IDX) \
- port_array_extract_bits__(IDX, PORT_ARRAY_L1_SHIFT, PORT_ARRAY_L1_BITS)
-
-/* Level 2: middle bits. */
-#define PORT_ARRAY_L2_BITS 5
-#define PORT_ARRAY_L2_SHIFT PORT_ARRAY_L3_BITS
-#define PORT_ARRAY_L2_SIZE (1u << PORT_ARRAY_L2_BITS)
-#define PORT_ARRAY_L2(IDX) \
- port_array_extract_bits__(IDX, PORT_ARRAY_L2_SHIFT, PORT_ARRAY_L2_BITS)
-
-/* Level 3: least-significant bits. */
-#define PORT_ARRAY_L3_BITS 6
-#define PORT_ARRAY_L3_SHIFT 0
-#define PORT_ARRAY_L3_SIZE (1u << PORT_ARRAY_L3_BITS)
-#define PORT_ARRAY_L3(IDX) \
- port_array_extract_bits__(IDX, PORT_ARRAY_L3_SHIFT, PORT_ARRAY_L3_BITS)
-
-#define PORT_ARRAY_SIZE (1u << (PORT_ARRAY_L1_BITS \
- + PORT_ARRAY_L2_BITS \
- + PORT_ARRAY_L3_BITS))
-
-BUILD_ASSERT_DECL(PORT_ARRAY_SIZE > 0xffff);
-
-/* A "sparse array" of up to 65536 elements (numbered 0...65535), implemented
- * as a 3-level trie. Most efficient when the elements are clustered
- * together. */
-struct port_array {
- struct port_array_l2 *l1[1u << PORT_ARRAY_L1_BITS];
-};
-
-struct port_array_l2 {
- struct port_array_l3 *l2[1u << PORT_ARRAY_L2_BITS];
-};
-
-struct port_array_l3 {
- void *l3[1u << PORT_ARRAY_L3_BITS];
-};
-
-/* Returns the value of the element numbered 'idx' in 'pa', or a null pointer
- * if no element numbered 'idx' has been set. */
-static inline void *
-port_array_get(const struct port_array *pa, uint16_t idx)
-{
- unsigned int l1_idx = PORT_ARRAY_L1(idx);
- unsigned int l2_idx = PORT_ARRAY_L2(idx);
- unsigned int l3_idx = PORT_ARRAY_L3(idx);
- return pa->l1[l1_idx]->l2[l2_idx]->l3[l3_idx];
-}
-
-void port_array_init(struct port_array *);
-void port_array_destroy(struct port_array *);
-void port_array_clear(struct port_array *);
-void port_array_set(struct port_array *, uint16_t idx, void *);
-void port_array_delete(struct port_array *, uint16_t idx);
-void *port_array_first(const struct port_array *, unsigned int *);
-void *port_array_next(const struct port_array *, unsigned int *);
-unsigned int port_array_count(const struct port_array *);
-
-#define PORT_ARRAY_FOR_EACH(DATA, ARRAY, PORT_NO) \
- for ((DATA) = port_array_first(ARRAY, &(PORT_NO)); (DATA) != NULL; \
- (DATA) = port_array_next(ARRAY, &(PORT_NO)))
-
-#endif /* port-array.h */
git://git.onelab.eu / sliver-openvswitch.git / commitdiff