1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2019 Mellanox Technologies, Ltd
5 #ifndef RTE_PMD_MLX5_COMMON_UTILS_H_
6 #define RTE_PMD_MLX5_COMMON_UTILS_H_
8 #include "mlx5_common.h"
10 /************************ mlx5 list *****************************/
12 /** Maximum size of string for naming. */
13 #define MLX5_NAME_SIZE 32
18 * Structure of the entry in the mlx5 list, user should define its own struct
19 * that contains this in order to store the data.
21 struct mlx5_list_entry {
22 LIST_ENTRY(mlx5_list_entry) next; /* Entry pointers in the list. */
23 uint32_t ref_cnt __rte_aligned(8); /* 0 means, entry is invalid. */
26 struct mlx5_list_entry *gentry;
31 struct mlx5_list_cache {
32 LIST_HEAD(mlx5_list_head, mlx5_list_entry) h;
33 uint32_t inv_cnt; /* Invalid entries counter. */
34 } __rte_cache_aligned;
37 * Type of callback function for entry removal.
40 * The tool instance user context.
42 * The entry in the list.
44 typedef void (*mlx5_list_remove_cb)(void *tool_ctx,
45 struct mlx5_list_entry *entry);
48 * Type of function for user defined matching.
51 * The tool instance context.
53 * The entry in the list.
55 * The pointer to new entry context.
58 * 0 if matching, non-zero number otherwise.
60 typedef int (*mlx5_list_match_cb)(void *tool_ctx,
61 struct mlx5_list_entry *entry, void *ctx);
63 typedef struct mlx5_list_entry *(*mlx5_list_clone_cb)(void *tool_ctx,
64 struct mlx5_list_entry *entry, void *ctx);
66 typedef void (*mlx5_list_clone_free_cb)(void *tool_ctx,
67 struct mlx5_list_entry *entry);
70 * Type of function for user defined mlx5 list entry creation.
73 * The mlx5 tool instance context.
75 * The pointer to new entry context.
78 * Pointer of entry on success, NULL otherwise.
80 typedef struct mlx5_list_entry *(*mlx5_list_create_cb)(void *tool_ctx,
84 * Linked mlx5 list structure.
86 * Entry in mlx5 list could be reused if entry already exists,
87 * reference count will increase and the existing entry returns.
89 * When destroy an entry from list, decrease reference count and only
90 * destroy when no further reference.
92 * Linked list is designed for limited number of entries,
93 * read mostly, less modification.
95 * For huge amount of entries, please consider hash list.
99 char name[MLX5_NAME_SIZE]; /**< Name of the mlx5 list. */
100 void *ctx; /* user objects target to callback. */
101 bool lcores_share; /* Whether to share objects between the lcores. */
102 mlx5_list_create_cb cb_create; /**< entry create callback. */
103 mlx5_list_match_cb cb_match; /**< entry match callback. */
104 mlx5_list_remove_cb cb_remove; /**< entry remove callback. */
105 mlx5_list_clone_cb cb_clone; /**< entry clone callback. */
106 mlx5_list_clone_free_cb cb_clone_free;
107 struct mlx5_list_cache cache[RTE_MAX_LCORE + 1];
108 /* Lcore cache, last index is the global cache. */
109 volatile uint32_t gen_cnt; /* List modification may update it. */
110 volatile uint32_t count; /* number of entries in list. */
111 rte_rwlock_t lock; /* read/write lock. */
115 * Create a mlx5 list.
117 * For actions in SW-steering is only memory and can be allowed
118 * to create duplicate objects, the lists don't need to check if
119 * there are existing same objects in other sub local lists,
120 * search the object only in local list will be more efficient.
123 * Pointer to the hast list table.
125 * Name of the mlx5 list.
127 * Pointer to the list context data.
128 * @param lcores_share
129 * Whether to share objects between the lcores.
131 * Callback function for entry create.
133 * Callback function for entry match.
135 * Callback function for entry remove.
137 * List pointer on success, otherwise NULL.
140 struct mlx5_list *mlx5_list_create(const char *name, void *ctx,
142 mlx5_list_create_cb cb_create,
143 mlx5_list_match_cb cb_match,
144 mlx5_list_remove_cb cb_remove,
145 mlx5_list_clone_cb cb_clone,
146 mlx5_list_clone_free_cb cb_clone_free);
149 * Search an entry matching the key.
151 * Result returned might be destroyed by other thread, must use
152 * this function only in main thread.
155 * Pointer to the mlx5 list.
157 * Common context parameter used by entry callback function.
160 * Pointer of the list entry if found, NULL otherwise.
163 struct mlx5_list_entry *mlx5_list_lookup(struct mlx5_list *list,
167 * Reuse or create an entry to the mlx5 list.
170 * Pointer to the hast list table.
172 * Common context parameter used by callback function.
175 * registered entry on success, NULL otherwise
178 struct mlx5_list_entry *mlx5_list_register(struct mlx5_list *list,
182 * Remove an entry from the mlx5 list.
184 * User should guarantee the validity of the entry.
187 * Pointer to the hast list.
189 * Entry to be removed from the mlx5 list table.
191 * 0 on entry removed, 1 on entry still referenced.
194 int mlx5_list_unregister(struct mlx5_list *list,
195 struct mlx5_list_entry *entry);
198 * Destroy the mlx5 list.
201 * Pointer to the mlx5 list.
204 void mlx5_list_destroy(struct mlx5_list *list);
207 * Get entry number from the mlx5 list.
210 * Pointer to the hast list.
212 * mlx5 list entry number.
216 mlx5_list_get_entry_num(struct mlx5_list *list);
218 /********************* Hash List **********************/
220 /* Hash list bucket. */
221 struct mlx5_hlist_bucket {
223 } __rte_cache_aligned;
226 * Hash list table structure
228 * The hash list bucket using the mlx5_list object for managing.
231 uint32_t mask; /* A mask for the bucket index range. */
233 bool direct_key; /* Whether to use the key directly as hash index. */
234 bool lcores_share; /* Whether to share objects between the lcores. */
235 struct mlx5_hlist_bucket buckets[] __rte_cache_aligned;
239 * Create a hash list table, the user can specify the list heads array size
240 * of the table, now the size should be a power of 2 in order to get better
241 * distribution for the entries. Each entry is a part of the whole data element
242 * and the caller should be responsible for the data element's allocation and
243 * cleanup / free. Key of each entry will be calculated with CRC in order to
244 * generate a little fairer distribution.
247 * Name of the hash list(optional).
249 * Heads array size of the hash list.
251 * Entry size to allocate if cb_create not specified.
253 * Whether to use the key directly as hash index.
254 * @param lcores_share
255 * Whether to share objects between the lcores.
257 * The hlist instance context.
259 * Callback function for entry create.
261 * Callback function for entry match.
263 * Callback function for entry remove.
265 * Callback function for entry clone.
266 * @param cb_clone_free
267 * Callback function for entry clone free.
269 * Pointer of the hash list table created, NULL on failure.
272 struct mlx5_hlist *mlx5_hlist_create(const char *name, uint32_t size,
273 bool direct_key, bool lcores_share,
274 void *ctx, mlx5_list_create_cb cb_create,
275 mlx5_list_match_cb cb_match,
276 mlx5_list_remove_cb cb_remove,
277 mlx5_list_clone_cb cb_clone,
278 mlx5_list_clone_free_cb cb_clone_free);
281 * Search an entry matching the key.
283 * Result returned might be destroyed by other thread, must use
284 * this function only in main thread.
287 * Pointer to the hast list table.
289 * Key for the searching entry.
291 * Common context parameter used by entry callback function.
294 * Pointer of the hlist entry if found, NULL otherwise.
297 struct mlx5_list_entry *mlx5_hlist_lookup(struct mlx5_hlist *h, uint64_t key,
301 * Insert an entry to the hash list table, the entry is only part of whole data
302 * element and a 64B key is used for matching. User should construct the key or
303 * give a calculated hash signature and guarantee there is no collision.
306 * Pointer to the hast list table.
308 * Entry to be inserted into the hash list table.
310 * Common context parameter used by callback function.
313 * registered entry on success, NULL otherwise
316 struct mlx5_list_entry *mlx5_hlist_register(struct mlx5_hlist *h, uint64_t key,
320 * Remove an entry from the hash list table. User should guarantee the validity
324 * Pointer to the hast list table. (not used)
326 * Entry to be removed from the hash list table.
328 * 0 on entry removed, 1 on entry still referenced.
331 int mlx5_hlist_unregister(struct mlx5_hlist *h, struct mlx5_list_entry *entry);
334 * Destroy the hash list table, all the entries already inserted into the lists
335 * will be handled by the callback function provided by the user (including
336 * free if needed) before the table is freed.
339 * Pointer to the hast list table.
342 void mlx5_hlist_destroy(struct mlx5_hlist *h);
344 #endif /* RTE_PMD_MLX5_COMMON_UTILS_H_ */