FD.io VPP  v18.07.1-19-g511ce25
Vector Packet Processing
memory_client.c
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1 /*
2  *------------------------------------------------------------------
3  * memory_client.c - API message handling, client code.
4  *
5  * Copyright (c) 2010 Cisco and/or its affiliates.
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at:
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  *------------------------------------------------------------------
18  */
19 
20 #include <setjmp.h>
21 
22 #include <svm/svm.h>
23 #include <svm/ssvm.h>
24 #include <vppinfra/serialize.h>
25 #include <vppinfra/hash.h>
27 
28 /* A hack. vl_client_get_first_plugin_msg_id depends on it */
30 
32 
33 #define vl_typedefs /* define message structures */
35 #undef vl_typedefs
36 
37 #define vl_endianfun /* define message structures */
39 #undef vl_endianfun
40 
41 /* instantiate all the print functions we know about */
42 #define vl_print(handle, ...) clib_warning (__VA_ARGS__)
43 #define vl_printfun
45 #undef vl_printfun
46 
47 typedef struct
48 {
52  pthread_t rx_thread_handle;
53  /* Plugin message base lookup scheme */
57 
59 
60 static void *
61 rx_thread_fn (void *arg)
62 {
63  svm_queue_t *q;
65  api_main_t *am = &api_main;
66  int i;
67 
68  q = am->vl_input_queue;
69 
70  /* So we can make the rx thread terminate cleanly */
71  if (setjmp (mm->rx_thread_jmpbuf) == 0)
72  {
73  mm->rx_thread_jmpbuf_valid = 1;
74  /*
75  * Find an unused slot in the per-cpu-mheaps array,
76  * and grab it for this thread. We need to be able to
77  * push/pop the thread heap without affecting other thread(s).
78  */
79  if (__os_thread_index == 0)
80  {
81  for (i = 0; i < ARRAY_LEN (clib_per_cpu_mheaps); i++)
82  {
83  if (clib_per_cpu_mheaps[i] == 0)
84  {
85  /* Copy the main thread mheap pointer */
87  __os_thread_index = i;
88  break;
89  }
90  }
91  ASSERT (__os_thread_index > 0);
92  }
93  while (1)
95  }
96  pthread_exit (0);
97 }
98 
99 static void
101 {
103  vl_msg_api_free (mp);
104  longjmp (mm->rx_thread_jmpbuf, 1);
105 }
106 
107 static void
109 {
110  api_main_t *am = &api_main;
111  int i;
112  u8 **keys = 0;
113  hash_pair_t *hp;
114 
115  if (!am->msg_index_by_name_and_crc)
116  return;
117 
118  /* *INDENT-OFF* */
120  ({
121  vec_add1 (keys, (u8 *) hp->key);
122  }));
123  /* *INDENT-ON* */
124  for (i = 0; i < vec_len (keys); i++)
125  vec_free (keys[i]);
126  vec_free (keys);
128 }
129 
130 static void
132 {
133  serialize_main_t _sm, *sm = &_sm;
134  api_main_t *am = &api_main;
135  u8 *tblv;
136  u32 nmsgs;
137  int i;
138  u8 *name_and_crc;
139  u32 msg_index;
140 
141  am->my_client_index = mp->index;
143 
144  /* Clean out any previous hash table (unlikely) */
146 
148 
149  /* Recreate the vnet-side API message handler table */
150  tblv = uword_to_pointer (mp->message_table, u8 *);
151  unserialize_open_data (sm, tblv, vec_len (tblv));
152  unserialize_integer (sm, &nmsgs, sizeof (u32));
153 
154  for (i = 0; i < nmsgs; i++)
155  {
157  unserialize_cstring (sm, (char **) &name_and_crc);
158  hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index);
159  }
160 }
161 
162 static void
163 noop_handler (void *notused)
164 {
165 }
166 
167 int
168 vl_client_connect (const char *name, int ctx_quota, int input_queue_size)
169 {
170  svm_region_t *svm;
173  svm_queue_t *vl_input_queue;
175  int rv = 0;
176  void *oldheap;
177  api_main_t *am = &api_main;
178 
179  if (am->my_registration)
180  {
181  clib_warning ("client %s already connected...", name);
182  return -1;
183  }
184 
185  if (am->vlib_rp == 0)
186  {
187  clib_warning ("am->vlib_rp NULL");
188  return -1;
189  }
190 
191  svm = am->vlib_rp;
192  shmem_hdr = am->shmem_hdr;
193 
194  if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0)
195  {
196  clib_warning ("shmem_hdr / input queue NULL");
197  return -1;
198  }
199 
200  pthread_mutex_lock (&svm->mutex);
201  oldheap = svm_push_data_heap (svm);
202  vl_input_queue = svm_queue_init (input_queue_size, sizeof (uword),
203  getpid (), 0);
204  svm_pop_heap (oldheap);
205  pthread_mutex_unlock (&svm->mutex);
206 
207  am->my_client_index = ~0;
208  am->my_registration = 0;
209  am->vl_input_queue = vl_input_queue;
210 
212  memset (mp, 0, sizeof (*mp));
213  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_CREATE);
214  mp->ctx_quota = ctx_quota;
215  mp->input_queue = (uword) vl_input_queue;
216  strncpy ((char *) mp->name, name, sizeof (mp->name) - 1);
217 
218  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
219 
220  while (1)
221  {
222  int qstatus;
223  struct timespec ts, tsrem;
224  int i;
225 
226  /* Wait up to 10 seconds */
227  for (i = 0; i < 1000; i++)
228  {
229  qstatus = svm_queue_sub (vl_input_queue, (u8 *) & rp,
230  SVM_Q_NOWAIT, 0);
231  if (qstatus == 0)
232  goto read_one_msg;
233  ts.tv_sec = 0;
234  ts.tv_nsec = 10000 * 1000; /* 10 ms */
235  while (nanosleep (&ts, &tsrem) < 0)
236  ts = tsrem;
237  }
238  /* Timeout... */
239  clib_warning ("memclnt_create_reply timeout");
240  return -1;
241 
242  read_one_msg:
243  if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_CREATE_REPLY)
244  {
245  clib_warning ("unexpected reply: id %d", ntohs (rp->_vl_msg_id));
246  continue;
247  }
248  rv = clib_net_to_host_u32 (rp->response);
249 
250  vl_msg_api_handler ((void *) rp);
251  break;
252  }
253  return (rv);
254 }
255 
256 static void
258 {
259  void *oldheap;
260  api_main_t *am = &api_main;
261 
262  pthread_mutex_lock (&am->vlib_rp->mutex);
263  oldheap = svm_push_data_heap (am->vlib_rp);
265  pthread_mutex_unlock (&am->vlib_rp->mutex);
266  svm_pop_heap (oldheap);
267 
268  am->my_client_index = ~0;
269  am->my_registration = 0;
270  am->vl_input_queue = 0;
271 }
272 
273 int
275 {
278  svm_queue_t *vl_input_queue;
280  time_t begin;
281  api_main_t *am = &api_main;
282 
283  ASSERT (am->vlib_rp);
284  shmem_hdr = am->shmem_hdr;
285  ASSERT (shmem_hdr && shmem_hdr->vl_input_queue);
286 
287  vl_input_queue = am->vl_input_queue;
288 
290  memset (mp, 0, sizeof (*mp));
291  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_DELETE);
292  mp->index = am->my_client_index;
293  mp->handle = (uword) am->my_registration;
294 
295  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
296 
297  /*
298  * Have to be careful here, in case the client is disconnecting
299  * because e.g. the vlib process died, or is unresponsive.
300  */
301  begin = time (0);
302  while (1)
303  {
304  time_t now;
305 
306  now = time (0);
307 
308  if (now >= (begin + 2))
309  {
310  clib_warning ("peer unresponsive, give up");
311  am->my_client_index = ~0;
312  am->my_registration = 0;
313  am->shmem_hdr = 0;
314  return -1;
315  }
316  if (svm_queue_sub (vl_input_queue, (u8 *) & rp, SVM_Q_NOWAIT, 0) < 0)
317  continue;
318 
319  /* drain the queue */
320  if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY)
321  {
322  clib_warning ("queue drain: %d", ntohs (rp->_vl_msg_id));
323  vl_msg_api_handler ((void *) rp);
324  continue;
325  }
326  vl_msg_api_handler ((void *) rp);
327  break;
328  }
329 
331  return 0;
332 }
333 
334 /**
335  * Stave off the binary API dead client reaper
336  * Only sent to inactive clients
337  */
338 static void
340 {
341  vl_api_memclnt_keepalive_reply_t *rmp;
342  api_main_t *am;
344 
345  am = &api_main;
346  shmem_hdr = am->shmem_hdr;
347 
348  rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp));
349  memset (rmp, 0, sizeof (*rmp));
350  rmp->_vl_msg_id = ntohs (VL_API_MEMCLNT_KEEPALIVE_REPLY);
351  rmp->context = mp->context;
352  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & rmp);
353 }
354 
355 #define foreach_api_msg \
356 _(RX_THREAD_EXIT, rx_thread_exit) \
357 _(MEMCLNT_CREATE_REPLY, memclnt_create_reply) \
358 _(MEMCLNT_DELETE_REPLY, memclnt_delete_reply) \
359 _(MEMCLNT_KEEPALIVE, memclnt_keepalive)
360 
361 void
363 {
364 
365 #define _(N,n) \
366  vl_msg_api_set_handlers(VL_API_##N, #n, \
367  vl_api_##n##_t_handler, \
368  noop_handler, \
369  vl_api_##n##_t_endian, \
370  vl_api_##n##_t_print, \
371  sizeof(vl_api_##n##_t), 1);
373 #undef _
374 }
375 
376 int
377 vl_client_api_map (const char *region_name)
378 {
379  int rv;
380 
381  if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0)
382  return rv;
383 
385  return 0;
386 }
387 
388 void
390 {
392 }
393 
394 u8
396 {
397  return (memory_client_main.connected_to_vlib != 0);
398 }
399 
400 static int
401 connect_to_vlib_internal (const char *svm_name,
402  const char *client_name,
403  int rx_queue_size, int want_pthread, int do_map)
404 {
405  int rv = 0;
407 
408  if (do_map && (rv = vl_client_api_map (svm_name)))
409  {
410  clib_warning ("vl_client_api map rv %d", rv);
411  return rv;
412  }
413 
414  if (vl_client_connect (client_name, 0 /* punt quota */ ,
415  rx_queue_size /* input queue */ ) < 0)
416  {
418  return -1;
419  }
420 
421  /* Start the rx queue thread */
422 
423  if (want_pthread)
424  {
425  rv = pthread_create (&mm->rx_thread_handle,
426  NULL /*attr */ , rx_thread_fn, 0);
427  if (rv)
428  clib_warning ("pthread_create returned %d", rv);
429  }
430 
431  mm->connected_to_vlib = 1;
432  return 0;
433 }
434 
435 int
436 vl_client_connect_to_vlib (const char *svm_name,
437  const char *client_name, int rx_queue_size)
438 {
439  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
440  1 /* want pthread */ ,
441  1 /* do map */ );
442 }
443 
444 int
446  const char *client_name,
447  int rx_queue_size)
448 {
449  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
450  0 /* want pthread */ ,
451  1 /* do map */ );
452 }
453 
454 int
455 vl_client_connect_to_vlib_no_map (const char *svm_name,
456  const char *client_name, int rx_queue_size)
457 {
458  return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
459  1 /* want pthread */ ,
460  0 /* dont map */ );
461 }
462 
463 static void
465 {
467  api_main_t *am = &api_main;
468  uword junk;
469 
470  if (mm->rx_thread_jmpbuf_valid)
471  {
473  ep = vl_msg_api_alloc (sizeof (*ep));
474  ep->_vl_msg_id = ntohs (VL_API_RX_THREAD_EXIT);
475  vl_msg_api_send_shmem (am->vl_input_queue, (u8 *) & ep);
476  pthread_join (mm->rx_thread_handle, (void **) &junk);
477  }
478  if (mm->connected_to_vlib)
479  {
481  if (do_unmap)
483  }
484  memset (mm, 0, sizeof (*mm));
485 }
486 
487 void
489 {
491 }
492 
493 void
495 {
497 }
498 
501 {
503  i32 retval = ntohl (mp->retval);
504 
505  mm->first_msg_id_reply = (retval >= 0) ? ntohs (mp->first_msg_id) : ~0;
506  mm->first_msg_id_reply_ready = 1;
507 }
508 
509 u16
510 vl_client_get_first_plugin_msg_id (const char *plugin_name)
511 {
513  api_main_t *am = &api_main;
515  f64 timeout;
516  void *old_handler;
517  clib_time_t clib_time;
518  u16 rv = ~0;
519 
520  if (strlen (plugin_name) + 1 > sizeof (mp->name))
521  return (rv);
522 
523  memset (&clib_time, 0, sizeof (clib_time));
524  clib_time_init (&clib_time);
525 
526  /* Push this plugin's first_msg_id_reply handler */
527  old_handler = am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY];
528  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = (void *)
530 
531  /* Ask the data-plane for the message-ID base of the indicated plugin */
532  mm->first_msg_id_reply_ready = 0;
533 
534  /* Not using shm client */
535  if (!am->my_registration)
536  {
537  mp = vl_socket_client_msg_alloc (sizeof (*mp));
538  memset (mp, 0, sizeof (*mp));
539  mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID);
540  mp->client_index = am->my_client_index;
541  strncpy ((char *) mp->name, plugin_name, sizeof (mp->name) - 1);
542 
543  if (vl_socket_client_write () <= 0)
544  goto sock_err;
545  if (vl_socket_client_read (1))
546  goto sock_err;
547 
548  if (mm->first_msg_id_reply_ready == 1)
549  {
550  rv = mm->first_msg_id_reply;
551  goto result;
552  }
553 
554  sock_err:
555  /* Restore old handler */
556  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;
557 
558  return -1;
559  }
560  else
561  {
562  mp = vl_msg_api_alloc (sizeof (*mp));
563  memset (mp, 0, sizeof (*mp));
564  mp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID);
565  mp->client_index = am->my_client_index;
566  strncpy ((char *) mp->name, plugin_name, sizeof (mp->name) - 1);
567 
569 
570  /* Synchronously wait for the answer */
571  timeout = clib_time_now (&clib_time) + 1.0;
572  while (clib_time_now (&clib_time) < timeout)
573  {
574  if (mm->first_msg_id_reply_ready == 1)
575  {
576  rv = mm->first_msg_id_reply;
577  goto result;
578  }
579  }
580  /* Restore old handler */
581  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;
582 
583  return rv;
584  }
585 
586 result:
587 
588  /* Restore the old handler */
589  am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;
590 
591  if (rv == (u16) ~ 0)
592  clib_warning ("plugin '%s' not registered", plugin_name);
593 
594  return rv;
595 }
596 
597 /*
598  * fd.io coding-style-patch-verification: ON
599  *
600  * Local Variables:
601  * eval: (c-set-style "gnu")
602  * End:
603  */
void * clib_per_cpu_mheaps[CLIB_MAX_MHEAPS]
Definition: mem_mheap.c:46
static void svm_pop_heap(void *oldheap)
Definition: svm.h:94
int vl_client_connect_to_vlib(const char *svm_name, const char *client_name, int rx_queue_size)
static u64 unserialize_likely_small_unsigned_integer(serialize_main_t *m)
Definition: serialize.h:254
u8 vl_mem_client_is_connected(void)
int vl_map_shmem(const char *region_name, int is_vlib)
int vl_client_connect_to_vlib_no_map(const char *svm_name, const char *client_name, int rx_queue_size)
int vl_socket_client_read(int wait)
Definition: socket_client.c:56
int vl_client_connect_to_vlib_no_rx_pthread(const char *svm_name, const char *client_name, int rx_queue_size)
int my_client_index
All VLIB-side message handlers use my_client_index to identify the queue / client.
Definition: api_common.h:309
#define NULL
Definition: clib.h:55
static f64 clib_time_now(clib_time_t *c)
Definition: time.h:203
static void disconnect_from_vlib_internal(u8 do_unmap)
static void vl_api_memclnt_keepalive_t_handler(vl_api_memclnt_keepalive_t *mp)
Stave off the binary API dead client reaper Only sent to inactive clients.
int i
#define hash_set_mem(h, key, value)
Definition: hash.h:275
svm_queue_t * vl_input_queue
Peer input queue pointer.
Definition: api_common.h:303
void * vl_msg_api_alloc(int nbytes)
static void noop_handler(void *notused)
unsigned char u8
Definition: types.h:56
double f64
Definition: types.h:142
void vl_client_api_unmap(void)
svm_queue_t * svm_queue_init(int nels, int elsize, int consumer_pid, int signal_when_queue_non_empty)
Definition: queue.c:51
void * vl_socket_client_msg_alloc(int nbytes)
vl_api_registration_t * my_registration
This is the (shared VM) address of the registration, don&#39;t use it to id the connection since it can&#39;t...
Definition: api_common.h:315
int svm_queue_sub(svm_queue_t *q, u8 *elem, svm_q_conditional_wait_t cond, u32 time)
Definition: queue.c:303
pthread_t rx_thread_handle
Definition: memory_client.c:52
void unserialize_open_data(serialize_main_t *m, u8 *data, uword n_data_bytes)
Definition: serialize.c:891
static void * svm_push_data_heap(svm_region_t *rp)
Definition: svm.h:86
static void * rx_thread_fn(void *arg)
Definition: memory_client.c:61
svm_region_t * vlib_rp
Current binary api segment descriptor.
Definition: api_common.h:254
struct vl_shmem_hdr_ * shmem_hdr
Binary API shared-memory segment header pointer.
Definition: api_common.h:264
unsigned int u32
Definition: types.h:88
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
vl_shmem_hdr_t * shmem_hdr
static void vl_api_memclnt_create_reply_t_handler(vl_api_memclnt_create_reply_t *mp)
int vl_client_connect(const char *name, int ctx_quota, int input_queue_size)
unsigned short u16
Definition: types.h:57
#define hash_free(h)
Definition: hash.h:310
void clib_time_init(clib_time_t *c)
Definition: time.c:178
void unserialize_cstring(serialize_main_t *m, char **s)
Definition: serialize.c:178
API main structure, used by both vpp and binary API clients.
Definition: api_common.h:201
static void vl_api_memclnt_delete_reply_t_handler(vl_api_memclnt_delete_reply_t *mp)
An API client registration, only in vpp/vlib.
Definition: api_common.h:44
void vl_msg_api_send_shmem(svm_queue_t *q, u8 *elem)
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:339
#define clib_warning(format, args...)
Definition: error.h:59
int vl_client_api_map(const char *region_name)
static void unserialize_integer(serialize_main_t *m, void *x, u32 n_bytes)
Definition: serialize.h:201
u16 vl_client_get_first_plugin_msg_id(const char *plugin_name)
#define ARRAY_LEN(x)
Definition: clib.h:59
#define foreach_api_msg
svm_queue_t * vl_input_queue
Definition: memory_shared.h:84
void vl_unmap_shmem_client(void)
void svm_queue_free(svm_queue_t *q)
Definition: queue.c:95
signed int i32
Definition: types.h:81
#define uword_to_pointer(u, type)
Definition: types.h:136
#define ASSERT(truth)
void vl_msg_api_queue_handler(svm_queue_t *q)
Definition: api_shared.c:757
void vl_msg_api_free(void *)
void vl_client_install_client_message_handlers(void)
void vl_client_disconnect_from_vlib_no_unmap(void)
static void vl_api_get_first_msg_id_reply_t_handler(vl_api_get_first_msg_id_reply_t *mp)
static void vl_api_name_and_crc_free(void)
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define hash_foreach_pair(p, v, body)
Iterate over hash pairs.
Definition: hash.h:373
int vl_client_disconnect(void)
u64 uword
Definition: types.h:112
static void vl_api_rx_thread_exit_t_handler(vl_api_rx_thread_exit_t *mp)
struct _svm_queue svm_queue_t
memory_client_main_t memory_client_main
Definition: memory_client.c:58
void(** msg_handlers)(void *)
Message handler vector.
Definition: api_common.h:204
void vl_client_disconnect_from_vlib(void)
static int connect_to_vlib_internal(const char *svm_name, const char *client_name, int rx_queue_size, int want_pthread, int do_map)
int vl_socket_client_write(void)
void * vl_msg_api_alloc_as_if_client(int nbytes)
uword * msg_index_by_name_and_crc
client message index hash table
Definition: api_common.h:324
api_main_t api_main
Definition: api_shared.c:35
volatile u8 first_msg_id_reply_ready
Definition: memory_client.c:54
pthread_mutex_t mutex
Definition: svm_common.h:37
non-blocking call
Definition: queue.h:49
void vl_msg_api_handler(void *the_msg)
Definition: api_shared.c:547