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33 #ifndef _RTE_MBUF_OFFLOAD_H_
34 #define _RTE_MBUF_OFFLOAD_H_
40 * The rte_mbuf_offload library provides the ability to specify a device generic
41 * off-load operation independent of the current Rx/Tx Ethernet offloads
42 * supported within the rte_mbuf structure, and add supports for multiple
43 * off-load operations and offload device types.
45 * The rte_mbuf_offload specifies the particular off-load operation type, such
46 * as a crypto operation, and provides a container for the operations
47 * parameter's inside the op union. These parameters are then used by the
48 * device which supports that operation to perform the specified offload.
50 * This library provides an API to create pre-allocated mempool of offload
51 * operations, with supporting allocate and free functions. It also provides
52 * APIs for attaching an offload to a mbuf, as well as an API to retrieve a
53 * specified offload type from an mbuf offload chain.
57 #include <rte_crypto.h>
60 /** packet mbuf offload operation types */
61 enum rte_mbuf_ol_op_type {
62 RTE_PKTMBUF_OL_NOT_SPECIFIED = 0,
63 /**< Off-load not specified */
65 /**< Crypto offload operation */
69 * Generic packet mbuf offload
70 * This is used to specify a offload operation to be performed on a rte_mbuf.
71 * Multiple offload operations can be chained to the same mbuf, but only a
72 * single offload operation of a particular type can be in the chain
74 struct rte_mbuf_offload {
75 struct rte_mbuf_offload *next; /**< next offload in chain */
76 struct rte_mbuf *m; /**< mbuf offload is attached to */
77 struct rte_mempool *mp; /**< mempool offload allocated from */
79 enum rte_mbuf_ol_op_type type; /**< offload type */
81 struct rte_crypto_op crypto; /**< Crypto operation */
85 /**< private data structure belonging to packet mbug offload mempool */
86 struct rte_pktmbuf_offload_pool_private {
87 uint16_t offload_priv_size;
88 /**< Size of private area in each mbuf_offload. */
93 * Creates a mempool of rte_mbuf_offload objects
95 * @param name mempool name
96 * @param size number of objects in mempool
97 * @param cache_size cache size of objects for each core
98 * @param priv_size size of private data to be allocated with each
99 * rte_mbuf_offload object
100 * @param socket_id Socket on which to allocate mempool objects
103 * - On success returns a valid mempool of rte_mbuf_offload objects
104 * - On failure return NULL
106 extern struct rte_mempool *
107 rte_pktmbuf_offload_pool_create(const char *name, unsigned size,
108 unsigned cache_size, uint16_t priv_size, int socket_id);
112 * Returns private data size allocated with each rte_mbuf_offload object by
115 * @param mpool rte_mbuf_offload mempool
117 * @return private data size
119 static inline uint16_t
120 __rte_pktmbuf_offload_priv_size(struct rte_mempool *mpool)
122 struct rte_pktmbuf_offload_pool_private *priv =
123 rte_mempool_get_priv(mpool);
125 return priv->offload_priv_size;
129 * Get specified off-load operation type from mbuf.
131 * @param m packet mbuf.
132 * @param type offload operation type requested.
135 * - On success retruns rte_mbuf_offload pointer
136 * - On failure returns NULL
139 static inline struct rte_mbuf_offload *
140 rte_pktmbuf_offload_get(struct rte_mbuf *m, enum rte_mbuf_ol_op_type type)
142 struct rte_mbuf_offload *ol;
144 for (ol = m->offload_ops; ol != NULL; ol = ol->next)
145 if (ol->type == type)
152 * Attach a rte_mbuf_offload to a mbuf. We only support a single offload of any
153 * one type in our chain of offloads.
155 * @param m packet mbuf.
156 * @param ol rte_mbuf_offload strucutre to be attached
159 * - On success returns the pointer to the offload we just added
160 * - On failure returns NULL
162 static inline struct rte_mbuf_offload *
163 rte_pktmbuf_offload_attach(struct rte_mbuf *m, struct rte_mbuf_offload *ol)
165 struct rte_mbuf_offload **ol_last;
167 for (ol_last = &m->offload_ops; ol_last[0] != NULL;
168 ol_last = &ol_last[0]->next)
169 if (ol_last[0]->type == ol->type)
174 ol_last[0]->next = NULL;
180 /** Rearms rte_mbuf_offload default parameters */
182 __rte_pktmbuf_offload_reset(struct rte_mbuf_offload *ol,
183 enum rte_mbuf_ol_op_type type)
189 case RTE_PKTMBUF_OL_CRYPTO:
190 __rte_crypto_op_reset(&ol->op.crypto); break;
196 /** Allocate rte_mbuf_offload from mempool */
197 static inline struct rte_mbuf_offload *
198 __rte_pktmbuf_offload_raw_alloc(struct rte_mempool *mp)
202 if (rte_mempool_get(mp, &buf) < 0)
205 return (struct rte_mbuf_offload *)buf;
209 * Allocate a rte_mbuf_offload with a specified operation type from
210 * rte_mbuf_offload mempool
212 * @param mpool rte_mbuf_offload mempool
213 * @param type offload operation type
216 * - On success returns a valid rte_mbuf_offload structure
217 * - On failure returns NULL
219 static inline struct rte_mbuf_offload *
220 rte_pktmbuf_offload_alloc(struct rte_mempool *mpool,
221 enum rte_mbuf_ol_op_type type)
223 struct rte_mbuf_offload *ol = __rte_pktmbuf_offload_raw_alloc(mpool);
226 __rte_pktmbuf_offload_reset(ol, type);
232 * free rte_mbuf_offload structure
235 rte_pktmbuf_offload_free(struct rte_mbuf_offload *ol)
237 if (ol != NULL && ol->mp != NULL)
238 rte_mempool_put(ol->mp, ol);
242 * Checks if the private data of a rte_mbuf_offload has enough capacity for
246 * - if sufficient space available returns pointer to start of private data
247 * - if insufficient space returns NULL
250 __rte_pktmbuf_offload_check_priv_data_size(struct rte_mbuf_offload *ol,
255 if (likely(ol->mp != NULL)) {
256 priv_size = __rte_pktmbuf_offload_priv_size(ol->mp);
258 if (likely(priv_size >= size))
259 return (void *)(ol + 1);
265 * Allocate space for crypto xforms in the private data space of the
266 * rte_mbuf_offload. This also defaults the crypto xform type and configures
267 * the chaining of the xform in the crypto operation
270 * - On success returns pointer to first crypto xform in crypto operations chain
271 * - On failure returns NULL
273 static inline struct rte_crypto_xform *
274 rte_pktmbuf_offload_alloc_crypto_xforms(struct rte_mbuf_offload *ol,
277 struct rte_crypto_xform *xform;
281 size = sizeof(struct rte_crypto_xform) * nb_xforms;
282 priv_data = __rte_pktmbuf_offload_check_priv_data_size(ol, size);
284 if (priv_data == NULL)
287 ol->op.crypto.xform = xform = (struct rte_crypto_xform *)priv_data;
290 xform->type = RTE_CRYPTO_XFORM_NOT_SPECIFIED;
291 xform = xform->next = --nb_xforms > 0 ? xform + 1 : NULL;
294 return ol->op.crypto.xform;
302 #endif /* _RTE_MBUF_OFFLOAD_H_ */