2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
18 #ifndef vpp_api_h_included
19 #define vpp_api_h_included
23 #include <vppinfra/types.h>
28 * common vpp api C declarations
30 * This file declares the common C API functions. These include connect,
31 * disconnect and utility functions as well as the low-level vapi_send and
32 * vapi_recv API. This is only the transport layer.
34 * Message formats and higher-level APIs are generated by running the
35 * vapi_c_gen.py script (which is run for in-tree APIs as part of the build
36 * process). It's not recommended to mix the higher and lower level APIs. Due
37 * to version issues, the higher-level APIs are not part of the shared library.
42 VAPI_OK = 0, /**< success */
43 VAPI_EINVAL, /**< invalid value encountered */
44 VAPI_EAGAIN, /**< operation would block */
45 VAPI_ENOTSUP, /**< operation not supported */
46 VAPI_ENOMEM, /**< out of memory */
47 VAPI_ENORESP, /**< no response to request */
48 VAPI_EMAP_FAIL, /**< failure while mapping api */
49 VAPI_ECON_FAIL, /**< failure while connecting to vpp */
50 VAPI_EINCOMPATIBLE, /**< fundamental incompatibility while connecting to vpp
51 (control ping/control ping reply mismatch) */
52 VAPI_MUTEX_FAILURE, /**< failure manipulating internal mutex(es) */
53 VAPI_EUSER, /**< user error used for breaking dispatch,
59 VAPI_MODE_BLOCKING = 1, /**< operations block until response received */
60 VAPI_MODE_NONBLOCKING = 2, /**< operations never block */
65 VAPI_WAIT_FOR_READ, /**< wait until a message can be read */
66 VAPI_WAIT_FOR_WRITE, /**< wait until a message can be written */
67 VAPI_WAIT_FOR_READ_WRITE, /**< wait until a read or write can be done */
70 typedef int vapi_msg_id_t;
71 typedef struct vapi_ctx_s *vapi_ctx_t;
74 * @brief allocate vapi message of given size
76 * @note message must be freed by vapi_msg_free if not consumed by vapi_send
79 * @param ctx opaque vapi context
81 * @return pointer to message or NULL if out of memory
83 void *vapi_msg_alloc (vapi_ctx_t ctx, size_t size);
86 * @brief free a vapi message
88 * @note messages received by vapi_recv must be freed when no longer needed
90 * @param ctx opaque vapi context
91 * @param msg message to be freed
93 void vapi_msg_free (vapi_ctx_t ctx, void *msg);
96 * @brief allocate vapi context
98 * @param[out] pointer to result variable
100 * @return VAPI_OK on success, other error code on error
102 vapi_error_e vapi_ctx_alloc (vapi_ctx_t * result);
105 * @brief free vapi context
107 void vapi_ctx_free (vapi_ctx_t ctx);
110 * @brief check if message identified by it's message id is known by the vpp to
111 * which the connection is open
113 bool vapi_is_msg_available (vapi_ctx_t ctx, vapi_msg_id_t type);
116 * @brief connect to vpp
118 * @param ctx opaque vapi context, must be allocated using vapi_ctx_alloc first
119 * @param name application name
120 * @param chroot_prefix shared memory prefix
121 * @param max_outstanding_requests max number of outstanding requests queued
122 * @param response_queue_size size of the response queue
123 * @param mode mode of operation - blocking or nonblocking
125 * @return VAPI_OK on success, other error code on error
127 vapi_error_e vapi_connect (vapi_ctx_t ctx, const char *name,
128 const char *chroot_prefix,
129 int max_outstanding_requests,
130 int response_queue_size, vapi_mode_e mode);
133 * @brief disconnect from vpp
135 * @param ctx opaque vapi context
137 * @return VAPI_OK on success, other error code on error
139 vapi_error_e vapi_disconnect (vapi_ctx_t ctx);
142 * @brief get event file descriptor
144 * @note this file descriptor becomes readable when messages (from vpp)
145 * are waiting in queue
147 * @param ctx opaque vapi context
148 * @param[out] fd pointer to result variable
150 * @return VAPI_OK on success, other error code on error
152 vapi_error_e vapi_get_fd (vapi_ctx_t ctx, int *fd);
155 * @brief low-level api for sending messages to vpp
157 * @note it is not recommended to use this api directly, use generated api
160 * @param ctx opaque vapi context
161 * @param msg message to send
163 * @return VAPI_OK on success, other error code on error
165 vapi_error_e vapi_send (vapi_ctx_t ctx, void *msg);
168 * @brief low-level api for atomically sending two messages to vpp - either
169 * both messages are sent or neither one is
171 * @note it is not recommended to use this api directly, use generated api
174 * @param ctx opaque vapi context
175 * @param msg1 first message to send
176 * @param msg2 second message to send
178 * @return VAPI_OK on success, other error code on error
180 vapi_error_e vapi_send2 (vapi_ctx_t ctx, void *msg1, void *msg2);
183 * @brief low-level api for reading messages from vpp
185 * @note it is not recommended to use this api directly, use generated api
188 * @param ctx opaque vapi context
189 * @param[out] msg pointer to result variable containing message
190 * @param[out] msg_size pointer to result variable containing message size
192 * @return VAPI_OK on success, other error code on error
194 vapi_error_e vapi_recv (vapi_ctx_t ctx, void **msg, size_t * msg_size);
197 * @brief wait for connection to become readable or writable
199 * @param ctx opaque vapi context
200 * @param mode type of property to wait for - readability, writability or both
202 * @return VAPI_OK on success, other error code on error
204 vapi_error_e vapi_wait (vapi_ctx_t ctx, vapi_wait_mode_e mode);
207 * @brief pick next message sent by vpp and call the appropriate callback
209 * @return VAPI_OK on success, other error code on error
211 vapi_error_e vapi_dispatch_one (vapi_ctx_t ctx);
214 * @brief loop vapi_dispatch_one until responses to all currently outstanding
215 * requests have been received and their callbacks called
217 * @note the dispatch loop is interrupted if any error is encountered or
218 * returned from the callback, in which case this error is returned as the
219 * result of vapi_dispatch. In this case it might be necessary to call dispatch
220 * again to process the remaining messages. Returning VAPI_EUSER from
221 * a callback allows the user to break the dispatch loop (and distinguish
222 * this case in the calling code from other failures). VAPI never returns
223 * VAPI_EUSER on its own.
225 * @return VAPI_OK on success, other error code on error
227 vapi_error_e vapi_dispatch (vapi_ctx_t ctx);
229 /** generic vapi event callback */
230 typedef vapi_error_e (*vapi_event_cb) (vapi_ctx_t ctx, void *callback_ctx,
234 * @brief set event callback to call when message with given id is dispatched
236 * @param ctx opaque vapi context
237 * @param id message id
238 * @param callback callback
239 * @param callback_ctx context pointer stored and passed to callback
241 void vapi_set_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id,
242 vapi_event_cb callback, void *callback_ctx);
245 * @brief clear event callback for given message id
247 * @param ctx opaque vapi context
248 * @param id message id
250 void vapi_clear_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id);
252 /** generic vapi event callback */
253 typedef vapi_error_e (*vapi_generic_event_cb) (vapi_ctx_t ctx,
255 vapi_msg_id_t id, void *msg);
257 * @brief set generic event callback
259 * @note this callback is called by dispatch if no message-type specific
260 * callback is set (so it's a fallback callback)
262 * @param ctx opaque vapi context
263 * @param callback callback
264 * @param callback_ctx context pointer stored and passed to callback
266 void vapi_set_generic_event_cb (vapi_ctx_t ctx,
267 vapi_generic_event_cb callback,
271 * @brief clear generic event callback
273 * @param ctx opaque vapi context
275 void vapi_clear_generic_event_cb (vapi_ctx_t ctx);
280 * fd.io coding-style-patch-verification: ON
283 * eval: (c-set-style "gnu")