2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 #include <sys/types.h>
19 #include <sys/socket.h>
22 #include <netinet/in.h>
26 #include <vnet/vnet.h>
27 #include <vlib/vlib.h>
28 #include <vlib/unix/unix.h>
29 #include <vlibapi/api.h>
30 #include <vlibmemory/api.h>
32 #include <vpp/api/vpe_msg_enum.h>
34 #include "vppapiclient.h"
38 * Client registers a callback. All messages are sent to the callback.
40 * Client calls blocking read().
41 * Clients are expected to collate events on a queue.
42 * vac_write() -> suspends RX thread
43 * vac_read() -> resumes RX thread
46 #define vl_typedefs /* define message structures */
47 #include <vpp/api/vpe_all_api_h.h>
50 #define vl_endianfun /* define message structures */
51 #include <vpp/api/vpe_all_api_h.h>
54 vlib_main_t vlib_global_main;
55 vlib_main_t **vlib_mains;
59 pthread_t rx_thread_handle;
60 pthread_t timeout_thread_handle;
61 pthread_mutex_t queue_lock;
62 pthread_cond_t suspend_cv;
63 pthread_cond_t resume_cv;
64 pthread_mutex_t timeout_lock;
65 pthread_cond_t timeout_cv;
66 pthread_cond_t timeout_cancel_cv;
67 pthread_cond_t terminate_cv;
71 vac_callback_t vac_callback;
73 bool rx_is_running = false;
75 /* Set to true to enable memory tracing */
76 bool mem_trace = false;
78 __attribute__((constructor))
80 vac_client_constructor (void)
82 clib_mem_init (0, 1 << 30);
88 heap = clib_mem_get_per_cpu_heap ();
89 h = mheap_header (heap);
90 /* make the main heap thread-safe */
91 h->flags |= MHEAP_FLAG_THREAD_SAFE;
98 __attribute__((destructor))
100 vac_client_destructor (void)
103 fformat(stderr, "TRACE: %s",
105 format_mheap, clib_mem_get_heap (), 1));
112 vac_main_t *pm = &vac_main;
113 memset(pm, 0, sizeof(*pm));
114 pthread_mutex_init(&pm->queue_lock, NULL);
115 pthread_cond_init(&pm->suspend_cv, NULL);
116 pthread_cond_init(&pm->resume_cv, NULL);
117 pthread_mutex_init(&pm->timeout_lock, NULL);
118 pthread_cond_init(&pm->timeout_cv, NULL);
119 pthread_cond_init(&pm->timeout_cancel_cv, NULL);
120 pthread_cond_init(&pm->terminate_cv, NULL);
126 vac_main_t *pm = &vac_main;
127 pthread_mutex_destroy(&pm->queue_lock);
128 pthread_cond_destroy(&pm->suspend_cv);
129 pthread_cond_destroy(&pm->resume_cv);
130 pthread_mutex_destroy(&pm->timeout_lock);
131 pthread_cond_destroy(&pm->timeout_cv);
132 pthread_cond_destroy(&pm->timeout_cancel_cv);
133 pthread_cond_destroy(&pm->terminate_cv);
134 memset(pm, 0, sizeof(*pm));
138 * Satisfy external references when -lvlib is not available.
140 void vlib_cli_output (struct vlib_main_t * vm, char * fmt, ...)
142 clib_warning ("vlib_cli_output called...");
146 vac_free (void * msg)
148 vl_msg_api_free (msg);
152 vac_api_handler (void *msg)
154 u16 id = ntohs(*((u16 *)msg));
155 msgbuf_t *msgbuf = (msgbuf_t *)(((u8 *)msg) - offsetof(msgbuf_t, data));
156 int l = ntohl(msgbuf->data_len);
158 clib_warning("Message ID %d has wrong length: %d\n", id, l);
160 /* Call Python callback */
161 ASSERT(vac_callback);
162 (vac_callback)(msg, l);
167 vac_rx_thread_fn (void *arg)
170 vl_api_memclnt_keepalive_t *mp;
171 vl_api_memclnt_keepalive_reply_t *rmp;
172 vac_main_t *pm = &vac_main;
173 api_main_t *am = &api_main;
174 vl_shmem_hdr_t *shmem_hdr;
177 q = am->vl_input_queue;
180 while (!svm_queue_sub(q, (u8 *)&msg, SVM_Q_WAIT, 0))
182 u16 id = ntohs(*((u16 *)msg));
184 case VL_API_RX_THREAD_EXIT:
185 vl_msg_api_free((void *) msg);
186 /* signal waiting threads that this thread is about to terminate */
187 pthread_mutex_lock(&pm->queue_lock);
188 pthread_cond_signal(&pm->terminate_cv);
189 pthread_mutex_unlock(&pm->queue_lock);
194 case VL_API_MEMCLNT_RX_THREAD_SUSPEND:
195 vl_msg_api_free((void * )msg);
196 /* Suspend thread and signal reader */
197 pthread_mutex_lock(&pm->queue_lock);
198 pthread_cond_signal(&pm->suspend_cv);
199 /* Wait for the resume signal */
200 pthread_cond_wait (&pm->resume_cv, &pm->queue_lock);
201 pthread_mutex_unlock(&pm->queue_lock);
204 case VL_API_MEMCLNT_READ_TIMEOUT:
205 clib_warning("Received read timeout in async thread\n");
206 vl_msg_api_free((void *) msg);
209 case VL_API_MEMCLNT_KEEPALIVE:
211 rmp = vl_msg_api_alloc (sizeof (*rmp));
212 memset (rmp, 0, sizeof (*rmp));
213 rmp->_vl_msg_id = ntohs(VL_API_MEMCLNT_KEEPALIVE_REPLY);
214 rmp->context = mp->context;
215 shmem_hdr = am->shmem_hdr;
216 vl_msg_api_send_shmem(shmem_hdr->vl_input_queue, (u8 *)&rmp);
217 vl_msg_api_free((void *) msg);
221 vac_api_handler((void *)msg);
227 vac_timeout_thread_fn (void *arg)
229 vl_api_memclnt_read_timeout_t *ep;
230 vac_main_t *pm = &vac_main;
231 api_main_t *am = &api_main;
240 pthread_mutex_lock(&pm->timeout_lock);
241 pthread_cond_wait (&pm->timeout_cv, &pm->timeout_lock);
242 timeout = read_timeout;
243 gettimeofday(&tv, NULL);
244 ts.tv_sec = tv.tv_sec + timeout;
246 rv = pthread_cond_timedwait (&pm->timeout_cancel_cv,
247 &pm->timeout_lock, &ts);
248 pthread_mutex_unlock(&pm->timeout_lock);
251 ep = vl_msg_api_alloc (sizeof (*ep));
252 ep->_vl_msg_id = ntohs(VL_API_MEMCLNT_READ_TIMEOUT);
253 vl_msg_api_send_shmem(am->vl_input_queue, (u8 *)&ep);
260 vac_rx_suspend (void)
262 api_main_t *am = &api_main;
263 vac_main_t *pm = &vac_main;
264 vl_api_memclnt_rx_thread_suspend_t *ep;
266 if (!pm->rx_thread_handle) return;
267 pthread_mutex_lock(&pm->queue_lock);
270 ep = vl_msg_api_alloc (sizeof (*ep));
271 ep->_vl_msg_id = ntohs(VL_API_MEMCLNT_RX_THREAD_SUSPEND);
272 vl_msg_api_send_shmem(am->vl_input_queue, (u8 *)&ep);
273 /* Wait for RX thread to tell us it has suspendend */
274 pthread_cond_wait(&pm->suspend_cv, &pm->queue_lock);
275 rx_is_running = false;
277 pthread_mutex_unlock(&pm->queue_lock);
283 vac_main_t *pm = &vac_main;
284 if (!pm->rx_thread_handle) return;
285 pthread_mutex_lock(&pm->queue_lock);
286 if (rx_is_running) goto unlock;
287 pthread_cond_signal(&pm->resume_cv);
288 rx_is_running = true;
290 pthread_mutex_unlock(&pm->queue_lock);
294 vac_msg_table_get_hash (void)
296 api_main_t *am = &api_main;
297 return (am->msg_index_by_name_and_crc);
301 vac_msg_table_size(void)
303 api_main_t *am = &api_main;
304 return hash_elts(am->msg_index_by_name_and_crc);
308 vac_connect (char * name, char * chroot_prefix, vac_callback_t cb,
312 vac_main_t *pm = &vac_main;
315 if (chroot_prefix != NULL)
316 vl_set_memory_root_path (chroot_prefix);
318 if ((rv = vl_client_api_map("/vpe-api"))) {
319 clib_warning ("vl_client_api map rv %d", rv);
323 if (vl_client_connect(name, 0, rx_qlen) < 0) {
324 vl_client_api_unmap();
329 /* Start the rx queue thread */
330 rv = pthread_create(&pm->rx_thread_handle, NULL, vac_rx_thread_fn, 0);
332 clib_warning("pthread_create returned %d", rv);
333 vl_client_api_unmap();
337 rx_is_running = true;
340 /* Start read timeout thread */
341 rv = pthread_create(&pm->timeout_thread_handle, NULL,
342 vac_timeout_thread_fn, 0);
344 clib_warning("pthread_create returned %d", rv);
345 vl_client_api_unmap();
349 pm->connected_to_vlib = 1;
355 set_timeout (unsigned short timeout)
357 vac_main_t *pm = &vac_main;
358 pthread_mutex_lock(&pm->timeout_lock);
359 read_timeout = timeout;
360 pthread_cond_signal(&pm->timeout_cv);
361 pthread_mutex_unlock(&pm->timeout_lock);
367 vac_main_t *pm = &vac_main;
368 pthread_mutex_lock(&pm->timeout_lock);
369 pthread_cond_signal(&pm->timeout_cancel_cv);
370 pthread_mutex_unlock(&pm->timeout_lock);
374 vac_disconnect (void)
376 api_main_t *am = &api_main;
377 vac_main_t *pm = &vac_main;
380 if (!pm->connected_to_vlib) return 0;
382 if (pm->rx_thread_handle) {
383 vl_api_rx_thread_exit_t *ep;
384 ep = vl_msg_api_alloc (sizeof (*ep));
385 ep->_vl_msg_id = ntohs(VL_API_RX_THREAD_EXIT);
386 vl_msg_api_send_shmem(am->vl_input_queue, (u8 *)&ep);
388 /* wait (with timeout) until RX thread has finished */
391 gettimeofday(&tv, NULL);
392 ts.tv_sec = tv.tv_sec + 5;
394 pthread_mutex_lock(&pm->queue_lock);
395 int rv = pthread_cond_timedwait(&pm->terminate_cv, &pm->queue_lock, &ts);
396 pthread_mutex_unlock(&pm->queue_lock);
397 /* now join so we wait until thread has -really- finished */
399 pthread_cancel(pm->rx_thread_handle);
401 pthread_join(pm->rx_thread_handle, (void **) &junk);
403 if (pm->timeout_thread_handle) {
404 /* cancel, wake then join the timeout thread */
405 pthread_cancel(pm->timeout_thread_handle);
407 pthread_join(pm->timeout_thread_handle, (void **) &junk);
410 vl_client_disconnect();
411 vl_client_api_unmap();
420 vac_read (char **p, int *l, u16 timeout)
423 api_main_t *am = &api_main;
424 vac_main_t *pm = &vac_main;
425 vl_api_memclnt_keepalive_t *mp;
426 vl_api_memclnt_keepalive_reply_t *rmp;
430 vl_shmem_hdr_t *shmem_hdr;
432 if (!pm->connected_to_vlib) return -1;
436 if (am->our_pid == 0) return (-1);
438 /* Poke timeout thread */
440 set_timeout(timeout);
442 q = am->vl_input_queue;
445 rv = svm_queue_sub(q, (u8 *)&msg, SVM_Q_WAIT, 0);
448 u16 msg_id = ntohs(*((u16 *)msg));
450 case VL_API_RX_THREAD_EXIT:
451 printf("Received thread exit\n");
452 vl_msg_api_free((void *) msg);
454 case VL_API_MEMCLNT_RX_THREAD_SUSPEND:
455 printf("Received thread suspend\n");
457 case VL_API_MEMCLNT_READ_TIMEOUT:
458 printf("Received read timeout %ds\n", timeout);
460 case VL_API_MEMCLNT_KEEPALIVE:
461 /* Handle an alive-check ping from vpp. */
463 rmp = vl_msg_api_alloc (sizeof (*rmp));
464 memset (rmp, 0, sizeof (*rmp));
465 rmp->_vl_msg_id = ntohs(VL_API_MEMCLNT_KEEPALIVE_REPLY);
466 rmp->context = mp->context;
467 shmem_hdr = am->shmem_hdr;
468 vl_msg_api_send_shmem(shmem_hdr->vl_input_queue, (u8 *)&rmp);
469 vl_msg_api_free((void *) msg);
471 * Python code is blissfully unaware of these pings, so
472 * act as if it never happened...
477 msgbuf = (msgbuf_t *)(((u8 *)msg) - offsetof(msgbuf_t, data));
478 *l = ntohl(msgbuf->data_len);
480 printf("Unregistered API message: %d\n", msg_id);
486 /* Let timeout notification thread know we're done */
490 printf("Read failed with %d\n", rv);
495 vl_msg_api_free((void *) msg);
496 /* Client might forget to resume RX thread on failure */
502 * XXX: Makes the assumption that client_index is the first member
504 typedef VL_API_PACKED(struct _vl_api_header {
510 vac_client_index (void)
512 return (api_main.my_client_index);
516 vac_write (char *p, int l)
519 api_main_t *am = &api_main;
520 vl_api_header_t *mp = vl_msg_api_alloc(l);
522 vac_main_t *pm = &vac_main;
524 if (!pm->connected_to_vlib) return -1;
525 if (!mp) return (-1);
528 mp->client_index = vac_client_index();
529 q = am->shmem_hdr->vl_input_queue;
530 rv = svm_queue_add(q, (u8 *)&mp, 0);
532 clib_warning("vpe_api_write fails: %d\n", rv);
540 vac_get_msg_index (unsigned char * name)
542 return vl_msg_api_get_msg_index (name);
546 vac_msg_table_max_index(void)
550 uword *h = vac_msg_table_get_hash();
551 hash_foreach_pair (hp, h,
553 if (hp->value[0] > max)
561 vac_set_error_handler (vac_error_callback_t cb)
563 if (cb) clib_error_register_handler (cb, 0);