Differential D24232 Diff 70449 sys/net/route/nhop_utils.h

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sys/net/route/nhop_utils.h

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2020 Alexander V. Chernikov
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*
				* $FreeBSD$
				*/

				#ifndef _NET_ROUTE_NHOP_UTILS_H_
				#define _NET_ROUTE_NHOP_UTILS_H_

				/* Chained hash table */
				struct _cht_head {
				uint32_t hash_size;
				uint32_t items_count;
				void **ptr;
				};

				static inline uint32_t
				_cht_get_resize_size(const struct _cht_head *head)
				{
				uint32_t new_size = 0;

				if ((head->items_count * 2 > head->hash_size) && (head->hash_size < 65536))
				new_size = head->hash_size * 2;
				else if ((head->items_count * 4 < head->hash_size) && head->hash_size > 16)
				new_size = head->hash_size / 2;

				return (new_size);
				}

				static inline int
				_cht_need_resize(const struct _cht_head *head)
				{

				return (_cht_get_resize_size(head) > 0);
				}


				#ifndef typeof
				#define typeof __typeof
				#endif

				#define CHT_SLIST_NEED_RESIZE(_head) \
				_cht_need_resize((const struct _cht_head *)(_head))
				#define CHT_SLIST_GET_RESIZE_BUCKETS(_head) \
				_cht_get_resize_size((const struct _cht_head *)(_head))
				#define CHT_SLIST_GET_RESIZE_SIZE(_buckets) ((_buckets) * sizeof(void *))

				#define CHT_SLIST_DEFINE(_HNAME, _ITEM_TYPE) \
				struct _HNAME##_head { \
				uint32_t hash_size; \
				uint32_t items_count; \
				_ITEM_TYPE **ptr; \
				}

				#define CHT_SLIST_INIT(_head, _ptr, _num_buckets) \
				(_head)->hash_size = _num_buckets; \
				(_head)->items_count = 0; \
				(_head)->ptr = _ptr;

				/* Default hash method for constant-size keys */

				#define CHT_GET_BUCK(_head, _PX, _key) _PX##_hash_key(_key) & ((_head)->hash_size - 1)
				#define CHT_GET_BUCK_OBJ(_head, _PX, _obj) _PX##_hash_obj(_obj) & ((_head)->hash_size - 1)

				#define CHT_FIRST(_head, idx) _CHT_FIRST((_head)->ptr, idx)
				#define _CHT_FIRST(_ptr, idx) (_ptr)[idx]

				#define CHT_SLIST_FIND(_head, _PX, _key, _ret) do { \
				uint32_t _buck = CHT_GET_BUCK(_head, _PX, _key); \
				_ret = CHT_FIRST(_head, _buck); \
				for ( ; _ret != NULL; _ret = _PX##_next(_ret)) { \
				if (_PX##_cmp(_key, (_ret))) \
				break; \
				} \
				} while(0)

				/*
				* hash_obj, nhop_cmp
				*/
				#define CHT_SLIST_FIND_BYOBJ(_head, _PX, _obj, _ret) do { \
				uint32_t _buck = CHT_GET_BUCK_OBJ(_head, _PX, _obj); \
				_ret = CHT_FIRST(_head, _buck); \
				for ( ; _ret != NULL; _ret = _PX##_next(_ret)) { \
				if (_PX##_cmp(_obj, _ret)) \
				break; \
				} \
				} while(0)

				#define CHT_SLIST_INSERT_HEAD(_head, _PX, _obj) do { \
				uint32_t _buck = CHT_GET_BUCK_OBJ(_head, _PX, _obj); \
				_PX##_next(_obj) = CHT_FIRST(_head, _buck); \
				CHT_FIRST(_head, _buck) = _obj; \
				(_head)->items_count++; \
				} while(0)

				#define CHT_SLIST_REMOVE(_head, _PX, _key, _ret) do { \
				typeof(*(_head)->ptr) _tmp; \
				uint32_t _buck = CHT_GET_BUCK(_head, _PX, _key); \
				_ret = CHT_FIRST(_head, _buck); \
				_tmp = NULL; \
				for ( ; _ret != NULL; _tmp = _ret, _ret = _PX##_next(_ret)) { \
				if (_PX##_cmp(_key, _ret)) \
				break; \
				} \
				if (_ret != NULL) { \
				if (_tmp == NULL) \
				CHT_FIRST(_head, _buck) = _PX##_next(_ret); \
				else \
				_PX##_next(_tmp) = _PX##_next(_ret); \
				(_head)->items_count--; \
				} \
				} while(0)

				#define CHT_SLIST_REMOVE_BYOBJ(_head, _PX, _obj, _ret) do { \
				typeof(*(_head)->ptr) _tmp; \
				uint32_t _buck = CHT_GET_BUCK_OBJ(_head, _PX, _obj); \
				_ret = CHT_FIRST(_head, _buck); \
				_tmp = NULL; \
				for ( ; _ret != NULL; _tmp = _ret, _ret = _PX##_next(_ret)) { \
				if (_PX##_cmp(_obj, _ret)) \
				break; \
				} \
				if (_ret != NULL) { \
				if (_tmp == NULL) \
				CHT_FIRST(_head, _buck) = _PX##_next(_ret); \
				else \
				_PX##_next(_tmp) = _PX##_next(_ret); \
				(_head)->items_count--; \
				} \
				} while(0)


				#define CHT_SLIST_FOREACH(_head, _PX, _x) \
				for (uint32_t _i = 0; _i < (_head)->hash_size; _i++) { \
				for (_x = CHT_FIRST(_head, _i); _x; _x = _PX##_next(_x))

				#define CHT_SLIST_FOREACH_END }

				#define CHT_SLIST_RESIZE(_head, _PX, _new_void_ptr, _new_hsize) \
				uint32_t _new_idx; \
				typeof((_head)->ptr) _new_ptr = (void *)_new_void_ptr; \
				typeof(*(_head)->ptr) _x, _y; \
				for (uint32_t _old_idx = 0; _old_idx < (_head)->hash_size; _old_idx++) {\
				_x = CHT_FIRST(_head, _old_idx); \
				_y = _x; \
				while (_y != NULL) { \
				_y = _PX##_next(_x); \
				_new_idx = _PX##_hash_obj(_x) & (_new_hsize - 1);\
				_PX##_next(_x) = _CHT_FIRST(_new_ptr, _new_idx);\
				_CHT_FIRST(_new_ptr, _new_idx) = _x; \
				_x = _y; \
				} \
				} \
				(_head)->hash_size = _new_hsize; \
				_new_void_ptr = (void *)(_head)->ptr; \
				(_head)->ptr = _new_ptr;

				/* bitmasks */

				struct bitmask_head {
				uint16_t free_off; /* index of the first potentially free block */
				uint16_t blocks; /* number of 4/8-byte blocks in the index */
				uint32_t items_count; /* total number of items */
				u_long *idx;
				};

				size_t bitmask_get_size(uint32_t items);
				uint32_t bitmask_get_resize_items(const struct bitmask_head *nh);
				int bitmask_should_resize(const struct bitmask_head *bh);
				void bitmask_swap(struct bitmask_head bh, void new_idx, uint32_t new_items, void **pidx);
				void bitmask_init(struct bitmask_head bh, void idx, uint32_t num_items);
				int bitmask_copy(const struct bitmask_head bi, void new_idx, uint32_t new_items);
				int bitmask_alloc_idx(struct bitmask_head bi, uint16_t pidx);
				int bitmask_free_idx(struct bitmask_head *bi, uint16_t idx);

				#endif