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34 #ifndef __INCLUDE_RTE_TABLE_H__
35 #define __INCLUDE_RTE_TABLE_H__
45 * This tool is part of the DPDK Packet Framework tool suite and provides
46 * a standard interface to implement different types of lookup tables for data
49 * Virtually any search algorithm that can uniquely associate data to a lookup
50 * key can be fitted under this lookup table abstraction. For the flow table
51 * use-case, the lookup key is an n-tuple of packet fields that uniquely
52 * identifies a traffic flow, while data represents actions and action
53 * meta-data associated with the same traffic flow.
62 /** Lookup table statistics */
63 struct rte_table_stats {
65 uint64_t n_pkts_lookup_miss;
72 * Parameters for lookup table creation. The underlying data structure is
73 * different for each lookup table type.
75 * CPU socket ID (e.g. for memory allocation purpose)
77 * Data size of each lookup table entry (measured in bytes)
79 * Handle to lookup table instance
81 typedef void* (*rte_table_op_create)(void *params, int socket_id,
88 * Handle to lookup table instance
90 * 0 on success, error code otherwise
92 typedef int (*rte_table_op_free)(void *table);
95 * Lookup table entry add
98 * Handle to lookup table instance
102 * Data to be associated with the current key. This parameter has to point to
103 * a valid memory buffer where the first entry_size bytes (table create
104 * parameter) are populated with the data.
106 * After successful invocation, *key_found is set to a value different than 0
107 * if the current key is already present in the table and to 0 if not. This
108 * pointer has to be set to a valid memory location before the table entry add
109 * function is called.
111 * After successful invocation, *entry_ptr stores the handle to the table
112 * entry containing the data associated with the current key. This handle can
113 * be used to perform further read-write accesses to this entry. This handle
114 * is valid until the key is deleted from the table or the same key is
115 * re-added to the table, typically to associate it with different data. This
116 * pointer has to be set to a valid memory location before the function is
119 * 0 on success, error code otherwise
121 typedef int (*rte_table_op_entry_add)(
129 * Lookup table entry delete
132 * Handle to lookup table instance
136 * After successful invocation, *key_found is set to a value different than 0
137 * if the current key was present in the table before the delete operation
138 * was performed and to 0 if not. This pointer has to be set to a valid
139 * memory location before the table entry delete function is called.
141 * After successful invocation, if the key is found in the table (*key found
142 * is different than 0 after function call is completed) and entry points to
143 * a valid buffer (entry is set to a value different than NULL before the
144 * function is called), then the first entry_size bytes (table create
145 * parameter) in *entry store a copy of table entry that contained the data
146 * associated with the current key before the key was deleted.
148 * 0 on success, error code otherwise
150 typedef int (*rte_table_op_entry_delete)(
157 * Lookup table entry add bulk
160 * Handle to lookup table instance
162 * Array containing lookup keys
164 * Array containing data to be associated with each key. Every item in the
165 * array has to point to a valid memory buffer where the first entry_size
166 * bytes (table create parameter) are populated with the data.
168 * Number of keys to add
170 * After successful invocation, key_found for every item in the array is set
171 * to a value different than 0 if the current key is already present in the
172 * table and to 0 if not. This pointer has to be set to a valid memory
173 * location before the table entry add function is called.
175 * After successful invocation, array *entries_ptr stores the handle to the
176 * table entry containing the data associated with every key. This handle can
177 * be used to perform further read-write accesses to this entry. This handle
178 * is valid until the key is deleted from the table or the same key is
179 * re-added to the table, typically to associate it with different data. This
180 * pointer has to be set to a valid memory location before the function is
183 * 0 on success, error code otherwise
185 typedef int (*rte_table_op_entry_add_bulk)(
194 * Lookup table entry delete bulk
197 * Handle to lookup table instance
199 * Array containing lookup keys
201 * Number of keys to delete
203 * After successful invocation, key_found for every item in the array is set
204 * to a value different than 0if the current key was present in the table
205 * before the delete operation was performed and to 0 if not. This pointer
206 * has to be set to a valid memory location before the table entry delete
207 * function is called.
209 * If entries pointer is NULL, this pointer is ignored for every entry found.
210 * Else, after successful invocation, if specific key is found in the table
211 * (key_found is different than 0 for this item after function call is
212 * completed) and item of entry array points to a valid buffer (entry is set
213 * to a value different than NULL before the function is called), then the
214 * first entry_size bytes (table create parameter) in *entry store a copy of
215 * table entry that contained the data associated with the current key before
216 * the key was deleted.
218 * 0 on success, error code otherwise
220 typedef int (*rte_table_op_entry_delete_bulk)(
228 * Lookup table lookup
231 * Handle to lookup table instance
233 * Burst of input packets specified as array of up to 64 pointers to struct
236 * 64-bit bitmask specifying which packets in the input burst are valid. When
237 * pkts_mask bit n is set, then element n of pkts array is pointing to a
238 * valid packet. Otherwise, element n of pkts array does not point to a valid
239 * packet, therefore it will not be accessed.
240 * @param lookup_hit_mask
241 * Once the table lookup operation is completed, this 64-bit bitmask
242 * specifies which of the valid packets in the input burst resulted in lookup
243 * hit. For each valid input packet (pkts_mask bit n is set), the following
244 * are true on lookup hit: lookup_hit_mask bit n is set, element n of entries
245 * array is valid and it points to the lookup table entry that was hit. For
246 * each valid input packet (pkts_mask bit n is set), the following are true
247 * on lookup miss: lookup_hit_mask bit n is not set and element n of entries
248 * array is not valid.
250 * Once the table lookup operation is completed, this array provides the
251 * lookup table entries that were hit, as described above. It is required
252 * that this array is always pre-allocated by the caller of this function
253 * with exactly 64 elements. The implementation is allowed to speculatively
254 * modify the elements of this array, so elements marked as invalid in
255 * lookup_hit_mask once the table lookup operation is completed might have
256 * been modified by this function.
258 * 0 on success, error code otherwise
260 typedef int (*rte_table_op_lookup)(
262 struct rte_mbuf **pkts,
264 uint64_t *lookup_hit_mask,
268 * Lookup table stats read
271 * Handle to lookup table instance
273 * Handle to table stats struct to copy data
275 * Flag indicating that stats should be cleared after read
278 * Error code or 0 on success.
280 typedef int (*rte_table_op_stats_read)(
282 struct rte_table_stats *stats,
285 /** Lookup table interface defining the lookup table operation */
286 struct rte_table_ops {
287 rte_table_op_create f_create; /**< Create */
288 rte_table_op_free f_free; /**< Free */
289 rte_table_op_entry_add f_add; /**< Entry add */
290 rte_table_op_entry_delete f_delete; /**< Entry delete */
291 rte_table_op_entry_add_bulk f_add_bulk; /**< Add entry bulk */
292 rte_table_op_entry_delete_bulk f_delete_bulk; /**< Delete entry bulk */
293 rte_table_op_lookup f_lookup; /**< Lookup */
294 rte_table_op_stats_read f_stats; /**< Stats */