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>
24 #include <vapi/vapi_common.h>
25 #include <svm/queue.h>
35 * common vpp api C declarations
37 * This file declares the common C API functions. These include connect,
38 * disconnect and utility functions as well as the low-level vapi_send and
39 * vapi_recv API. This is only the transport layer.
41 * Message formats and higher-level APIs are generated by running the
42 * vapi_c_gen.py script (which is run for in-tree APIs as part of the build
43 * process). It's not recommended to mix the higher and lower level APIs. Due
44 * to version issues, the higher-level APIs are not part of the shared library.
46 typedef struct vapi_ctx_s *vapi_ctx_t;
49 * @brief allocate vapi message of given size
51 * @note message must be freed by vapi_msg_free if not consumed by vapi_send
54 * @param ctx opaque vapi context
56 * @return pointer to message or NULL if out of memory
58 void *vapi_msg_alloc (vapi_ctx_t ctx, size_t size);
61 * @brief free a vapi message
63 * @note messages received by vapi_recv must be freed when no longer needed
65 * @param ctx opaque vapi context
66 * @param msg message to be freed
68 void vapi_msg_free (vapi_ctx_t ctx, void *msg);
71 * @brief allocate vapi context
73 * @param[out] pointer to result variable
75 * @return VAPI_OK on success, other error code on error
77 vapi_error_e vapi_ctx_alloc (vapi_ctx_t * result);
80 * @brief free vapi context
82 void vapi_ctx_free (vapi_ctx_t ctx);
85 * @brief check if message identified by it's message id is known by the vpp to
86 * which the connection is open
88 bool vapi_is_msg_available (vapi_ctx_t ctx, vapi_msg_id_t type);
91 * @brief connect to vpp
93 * @param ctx opaque vapi context, must be allocated using vapi_ctx_alloc first
94 * @param name application name
95 * @param chroot_prefix shared memory prefix
96 * @param max_outstanding_requests max number of outstanding requests queued
97 * @param response_queue_size size of the response queue
98 * @param mode mode of operation - blocking or nonblocking
99 * @param handle_keepalives - if true, automatically handle memclnt_keepalive
101 * @return VAPI_OK on success, other error code on error
103 vapi_error_e vapi_connect (vapi_ctx_t ctx, const char *name,
104 const char *chroot_prefix,
105 int max_outstanding_requests,
106 int response_queue_size, vapi_mode_e mode,
107 bool handle_keepalives);
110 * @brief disconnect from vpp
112 * @param ctx opaque vapi context
114 * @return VAPI_OK on success, other error code on error
116 vapi_error_e vapi_disconnect (vapi_ctx_t ctx);
119 * @brief get event file descriptor
121 * @note this file descriptor becomes readable when messages (from vpp)
122 * are waiting in queue
124 * @param ctx opaque vapi context
125 * @param[out] fd pointer to result variable
127 * @return VAPI_OK on success, other error code on error
129 vapi_error_e vapi_get_fd (vapi_ctx_t ctx, int *fd);
132 * @brief low-level api for sending messages to vpp
134 * @note it is not recommended to use this api directly, use generated api
137 * @param ctx opaque vapi context
138 * @param msg message to send
140 * @return VAPI_OK on success, other error code on error
142 vapi_error_e vapi_send (vapi_ctx_t ctx, void *msg);
145 * @brief low-level api for atomically sending two messages to vpp - either
146 * both messages are sent or neither one is
148 * @note it is not recommended to use this api directly, use generated api
151 * @param ctx opaque vapi context
152 * @param msg1 first message to send
153 * @param msg2 second message to send
155 * @return VAPI_OK on success, other error code on error
157 vapi_error_e vapi_send2 (vapi_ctx_t ctx, void *msg1, void *msg2);
160 * @brief low-level api for reading messages from vpp
162 * @note it is not recommended to use this api directly, use generated api
165 * @param ctx opaque vapi context
166 * @param[out] msg pointer to result variable containing message
167 * @param[out] msg_size pointer to result variable containing message size
168 * @param cond enum type for blocking, non-blocking or timed wait call
169 * @param time in sec for timed wait
171 * @return VAPI_OK on success, other error code on error
173 vapi_error_e vapi_recv (vapi_ctx_t ctx, void **msg, size_t * msg_size,
174 svm_q_conditional_wait_t cond, u32 time);
177 * @brief wait for connection to become readable or writable
179 * @param ctx opaque vapi context
180 * @param mode type of property to wait for - readability, writability or both
182 * @return VAPI_OK on success, other error code on error
184 vapi_error_e vapi_wait (vapi_ctx_t ctx, vapi_wait_mode_e mode);
187 * @brief pick next message sent by vpp and call the appropriate callback
189 * @return VAPI_OK on success, other error code on error
191 vapi_error_e vapi_dispatch_one (vapi_ctx_t ctx);
194 * @brief loop vapi_dispatch_one until responses to all currently outstanding
195 * requests have been received and their callbacks called
197 * @note the dispatch loop is interrupted if any error is encountered or
198 * returned from the callback, in which case this error is returned as the
199 * result of vapi_dispatch. In this case it might be necessary to call dispatch
200 * again to process the remaining messages. Returning VAPI_EUSER from
201 * a callback allows the user to break the dispatch loop (and distinguish
202 * this case in the calling code from other failures). VAPI never returns
203 * VAPI_EUSER on its own.
205 * @return VAPI_OK on success, other error code on error
207 vapi_error_e vapi_dispatch (vapi_ctx_t ctx);
209 /** generic vapi event callback */
210 typedef vapi_error_e (*vapi_event_cb) (vapi_ctx_t ctx, void *callback_ctx,
214 * @brief set event callback to call when message with given id is dispatched
216 * @param ctx opaque vapi context
217 * @param id message id
218 * @param callback callback
219 * @param callback_ctx context pointer stored and passed to callback
221 void vapi_set_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id,
222 vapi_event_cb callback, void *callback_ctx);
225 * @brief clear event callback for given message id
227 * @param ctx opaque vapi context
228 * @param id message id
230 void vapi_clear_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id);
232 /** generic vapi event callback */
233 typedef vapi_error_e (*vapi_generic_event_cb) (vapi_ctx_t ctx,
235 vapi_msg_id_t id, void *msg);
237 * @brief set generic event callback
239 * @note this callback is called by dispatch if no message-type specific
240 * callback is set (so it's a fallback callback)
242 * @param ctx opaque vapi context
243 * @param callback callback
244 * @param callback_ctx context pointer stored and passed to callback
246 void vapi_set_generic_event_cb (vapi_ctx_t ctx,
247 vapi_generic_event_cb callback,
251 * @brief clear generic event callback
253 * @param ctx opaque vapi context
255 void vapi_clear_generic_event_cb (vapi_ctx_t ctx);
264 * fd.io coding-style-patch-verification: ON
267 * eval: (c-set-style "gnu")