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 *------------------------------------------------------------------
21 #include <arpa/inet.h>
25 #include <vpp-api/vapi/vapi_dbg.h>
26 #include <vpp-api/vapi/vapi.h>
27 #include <vpp-api/vapi/vapi_internal.h>
28 #include <vppinfra/types.h>
29 #include <vlibapi/api_common.h>
30 #include <vlibmemory/api_common.h>
32 /* we need to use control pings for some stuff and because we're forced to put
33 * the code in headers, we need a way to be able to grab the ids of these
34 * messages - so declare them here as extern */
35 vapi_msg_id_t vapi_msg_id_control_ping = 0;
36 vapi_msg_id_t vapi_msg_id_control_ping_reply = 0;
41 vapi_message_desc_t **msgs;
42 size_t max_len_name_with_crc;
53 static const u32 context_counter_mask = (1 << 31);
57 vapi_error_e (*cb) (vapi_ctx_t ctx, void *callback_ctx, vapi_msg_id_t id,
60 } vapi_generic_cb_with_ctx;
64 vapi_error_e (*cb) (vapi_ctx_t ctx, void *callback_ctx, void *payload);
66 } vapi_event_cb_with_ctx;
71 int requests_size; /* size of the requests array (circular queue) */
72 int requests_start; /* index of first request */
73 int requests_count; /* number of used slots */
76 vapi_generic_cb_with_ctx generic_cb;
77 vapi_event_cb_with_ctx *event_cbs;
78 u16 *vapi_msg_id_t_to_vl_msg_id;
80 vapi_msg_id_t *vl_msg_id_to_vapi_msg_t;
82 pthread_mutex_t requests_mutex;
86 vapi_gen_req_context (vapi_ctx_t ctx)
88 ++ctx->context_counter;
89 ctx->context_counter %= context_counter_mask;
90 return ctx->context_counter | context_counter_mask;
94 vapi_get_request_count (vapi_ctx_t ctx)
96 return ctx->requests_count;
100 vapi_requests_full (vapi_ctx_t ctx)
102 return (ctx->requests_count == ctx->requests_size);
106 vapi_requests_empty (vapi_ctx_t ctx)
108 return (0 == ctx->requests_count);
112 vapi_requests_end (vapi_ctx_t ctx)
114 return (ctx->requests_start + ctx->requests_count) % ctx->requests_size;
118 vapi_store_request (vapi_ctx_t ctx, u32 context, bool is_dump,
119 vapi_cb_t callback, void *callback_ctx)
121 assert (!vapi_requests_full (ctx));
122 /* if the mutex is not held, bad things will happen */
123 assert (0 != pthread_mutex_trylock (&ctx->requests_mutex));
124 const int requests_end = vapi_requests_end (ctx);
125 vapi_req_t *slot = &ctx->requests[requests_end];
126 slot->is_dump = is_dump;
127 slot->context = context;
128 slot->callback = callback;
129 slot->callback_ctx = callback_ctx;
130 VAPI_DBG ("stored@%d: context:%x (start is @%d)", requests_end, context,
131 ctx->requests_start);
132 ++ctx->requests_count;
133 assert (!vapi_requests_empty (ctx));
137 struct to_be_freed_s;
141 struct to_be_freed_s *next;
144 static struct to_be_freed_s *to_be_freed = NULL;
147 vapi_add_to_be_freed (void *v)
149 struct to_be_freed_s *prev = NULL;
150 struct to_be_freed_s *tmp;
152 while (tmp && tmp->v)
161 tmp = to_be_freed = calloc (1, sizeof (*to_be_freed));
165 tmp = prev->next = calloc (1, sizeof (*to_be_freed));
168 VAPI_DBG ("To be freed %p", v);
173 vapi_trace_free (void *v)
175 struct to_be_freed_s *tmp = to_be_freed;
176 while (tmp && tmp->v != v)
180 if (tmp && tmp->v == v)
182 VAPI_DBG ("Freed %p", v);
187 VAPI_ERR ("Trying to free untracked pointer %p", v);
193 vapi_to_be_freed_validate ()
195 struct to_be_freed_s *tmp = to_be_freed;
200 VAPI_ERR ("Unfreed msg %p!", tmp->v);
209 vapi_msg_alloc (vapi_ctx_t ctx, size_t size)
215 void *rv = vl_msg_api_alloc_or_null (size);
220 vapi_msg_free (vapi_ctx_t ctx, void *msg)
227 vapi_trace_free (msg);
229 vl_msg_api_free (msg);
233 vapi_ctx_alloc (vapi_ctx_t * result)
235 vapi_ctx_t ctx = calloc (1, sizeof (struct vapi_ctx_s));
240 ctx->context_counter = 0;
241 ctx->vapi_msg_id_t_to_vl_msg_id =
242 malloc (__vapi_metadata.count *
243 sizeof (*ctx->vapi_msg_id_t_to_vl_msg_id));
244 if (!ctx->vapi_msg_id_t_to_vl_msg_id)
248 ctx->event_cbs = calloc (__vapi_metadata.count, sizeof (*ctx->event_cbs));
253 pthread_mutex_init (&ctx->requests_mutex, NULL);
262 vapi_ctx_free (vapi_ctx_t ctx)
264 assert (!ctx->connected);
265 free (ctx->requests);
266 free (ctx->vapi_msg_id_t_to_vl_msg_id);
267 free (ctx->event_cbs);
268 free (ctx->vl_msg_id_to_vapi_msg_t);
269 pthread_mutex_destroy (&ctx->requests_mutex);
274 vapi_is_msg_available (vapi_ctx_t ctx, vapi_msg_id_t id)
276 return vapi_lookup_vl_msg_id (ctx, id) != UINT16_MAX;
280 vapi_connect (vapi_ctx_t ctx, const char *name,
281 const char *chroot_prefix,
282 int max_outstanding_requests,
283 int response_queue_size, vapi_mode_e mode)
285 if (response_queue_size <= 0 || max_outstanding_requests <= 0)
289 ctx->requests_size = max_outstanding_requests;
290 const size_t size = ctx->requests_size * sizeof (*ctx->requests);
291 void *tmp = realloc (ctx->requests, size);
297 memset (ctx->requests, 0, size);
298 ctx->requests_start = ctx->requests_count = 0;
301 VAPI_DBG ("set memory root path `%s'", chroot_prefix);
302 vl_set_memory_root_path ((char *) chroot_prefix);
304 static char api_map[] = "/vpe-api";
305 VAPI_DBG ("client api map `%s'", api_map);
306 if ((vl_client_api_map (api_map)) < 0)
308 return VAPI_EMAP_FAIL;
310 VAPI_DBG ("connect client `%s'", name);
311 if (vl_client_connect ((char *) name, 0, response_queue_size) < 0)
313 vl_client_api_unmap ();
314 return VAPI_ECON_FAIL;
316 #if VAPI_DEBUG_CONNECT
317 VAPI_DBG ("start probing messages");
321 for (i = 0; i < __vapi_metadata.count; ++i)
323 vapi_message_desc_t *m = __vapi_metadata.msgs[i];
324 u8 scratch[m->name_with_crc_len + 1];
325 memcpy (scratch, m->name_with_crc, m->name_with_crc_len + 1);
326 u32 id = vl_api_get_msg_index (scratch);
331 VAPI_ERR ("Returned vl_msg_id `%u' > UINT16MAX `%u'!", id,
336 if (id > ctx->vl_msg_id_max)
338 vapi_msg_id_t *tmp = realloc (ctx->vl_msg_id_to_vapi_msg_t,
340 (*ctx->vl_msg_id_to_vapi_msg_t) *
347 ctx->vl_msg_id_to_vapi_msg_t = tmp;
348 ctx->vl_msg_id_max = id;
350 ctx->vl_msg_id_to_vapi_msg_t[id] = m->id;
351 ctx->vapi_msg_id_t_to_vl_msg_id[m->id] = id;
352 #if VAPI_DEBUG_CONNECT
353 VAPI_DBG ("Message `%s' has vl_msg_id `%u'", m->name_with_crc,
359 ctx->vapi_msg_id_t_to_vl_msg_id[m->id] = UINT16_MAX;
360 VAPI_DBG ("Message `%s' not available", m->name_with_crc);
363 #if VAPI_DEBUG_CONNECT
364 VAPI_DBG ("finished probing messages");
366 if (!vapi_is_msg_available (ctx, vapi_msg_id_control_ping) ||
367 !vapi_is_msg_available (ctx, vapi_msg_id_control_ping_reply))
370 ("control ping or control ping reply not available, cannot connect");
371 rv = VAPI_EINCOMPATIBLE;
375 ctx->connected = true;
378 vl_client_disconnect ();
379 vl_client_api_unmap ();
384 vapi_disconnect (vapi_ctx_t ctx)
390 vl_client_disconnect ();
391 vl_client_api_unmap ();
393 vapi_to_be_freed_validate ();
395 ctx->connected = false;
400 vapi_get_fd (vapi_ctx_t ctx, int *fd)
406 vapi_send (vapi_ctx_t ctx, void *msg)
408 vapi_error_e rv = VAPI_OK;
409 if (!ctx || !msg || !ctx->connected)
415 unix_shared_memory_queue_t *q = api_main.shmem_hdr->vl_input_queue;
417 unsigned msgid = be16toh (*(u16 *) msg);
418 if (msgid <= ctx->vl_msg_id_max)
420 vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid];
421 if (id < __vapi_metadata.count)
423 VAPI_DBG ("send msg %u[%s]", msgid, __vapi_metadata.msgs[id]->name);
427 VAPI_DBG ("send msg %u[UNKNOWN]", msgid);
432 VAPI_DBG ("send msg %u[UNKNOWN]", msgid);
435 tmp = unix_shared_memory_queue_add (q, (u8 *) & msg,
436 VAPI_MODE_BLOCKING ==
443 VAPI_DBG ("vapi_send() rv = %d", rv);
448 vapi_send2 (vapi_ctx_t ctx, void *msg1, void *msg2)
450 vapi_error_e rv = VAPI_OK;
451 if (!ctx || !msg1 || !msg2 || !ctx->connected)
456 unix_shared_memory_queue_t *q = api_main.shmem_hdr->vl_input_queue;
458 unsigned msgid1 = be16toh (*(u16 *) msg1);
459 unsigned msgid2 = be16toh (*(u16 *) msg2);
460 const char *name1 = "UNKNOWN";
461 const char *name2 = "UNKNOWN";
462 if (msgid1 <= ctx->vl_msg_id_max)
464 vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid1];
465 if (id < __vapi_metadata.count)
467 name1 = __vapi_metadata.msgs[id]->name;
470 if (msgid2 <= ctx->vl_msg_id_max)
472 vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid2];
473 if (id < __vapi_metadata.count)
475 name2 = __vapi_metadata.msgs[id]->name;
478 VAPI_DBG ("send two: %u[%s], %u[%s]", msgid1, name1, msgid2, name2);
480 int tmp = unix_shared_memory_queue_add2 (q, (u8 *) & msg1, (u8 *) & msg2,
481 VAPI_MODE_BLOCKING ==
488 VAPI_DBG ("vapi_send() rv = %d", rv);
493 vapi_recv (vapi_ctx_t ctx, void **msg, size_t * msg_size)
495 if (!ctx || !ctx->connected || !msg || !msg_size)
499 vapi_error_e rv = VAPI_OK;
500 api_main_t *am = &api_main;
503 if (am->our_pid == 0)
508 unix_shared_memory_queue_t *q = am->vl_input_queue;
509 VAPI_DBG ("doing shm queue sub");
510 int tmp = unix_shared_memory_queue_sub (q, (u8 *) & data, 0);
514 vapi_add_to_be_freed ((void *) data);
517 (msgbuf_t *) ((u8 *) data - offsetof (msgbuf_t, data));
518 if (!msgbuf->data_len)
520 vapi_msg_free (ctx, (u8 *) data);
524 *msg_size = ntohl (msgbuf->data_len);
525 VAPI_DBG ("recv msg %p", *msg);
535 vapi_wait (vapi_ctx_t ctx, vapi_wait_mode_e mode)
542 vapi_dispatch_response (vapi_ctx_t ctx, vapi_msg_id_t id,
543 u32 context, void *msg)
546 if (0 != (mrv = pthread_mutex_lock (&ctx->requests_mutex)))
548 VAPI_DBG ("pthread_mutex_lock() failed, rv=%d:%s", mrv, strerror (mrv));
549 return VAPI_MUTEX_FAILURE;
551 int tmp = ctx->requests_start;
552 const int requests_end = vapi_requests_end (ctx);
553 while (ctx->requests[tmp].context != context && tmp != requests_end)
556 if (tmp == ctx->requests_size)
561 VAPI_DBG ("dispatch, search from %d, %s at %d", ctx->requests_start,
562 ctx->requests[tmp].context == context ? "matched" : "stopped",
564 vapi_error_e rv = VAPI_OK;
565 if (ctx->requests[tmp].context == context)
567 while (ctx->requests_start != tmp)
569 VAPI_ERR ("No response to req with context=%u",
570 (unsigned) ctx->requests[tmp].context);
571 ctx->requests[ctx->requests_start].callback (ctx,
574 requests_start].callback_ctx,
577 memset (&ctx->requests[ctx->requests_start], 0,
578 sizeof (ctx->requests[ctx->requests_start]));
579 ++ctx->requests_start;
580 --ctx->requests_count;
581 if (ctx->requests_start == ctx->requests_size)
583 ctx->requests_start = 0;
586 // now ctx->requests_start == tmp
587 int payload_offset = vapi_get_payload_offset (id);
588 void *payload = ((u8 *) msg) + payload_offset;
590 if (ctx->requests[tmp].is_dump)
592 if (vapi_msg_id_control_ping_reply == id)
601 if (payload_offset != -1)
604 ctx->requests[tmp].callback (ctx, ctx->requests[tmp].callback_ctx,
605 VAPI_OK, is_last, payload);
609 /* this is a message without payload, so bend the callback a little
612 ((vapi_error_e (*)(vapi_ctx_t, void *, vapi_error_e, bool))
613 ctx->requests[tmp].callback) (ctx,
614 ctx->requests[tmp].callback_ctx,
619 memset (&ctx->requests[ctx->requests_start], 0,
620 sizeof (ctx->requests[ctx->requests_start]));
621 ++ctx->requests_start;
622 --ctx->requests_count;
623 if (ctx->requests_start == ctx->requests_size)
625 ctx->requests_start = 0;
628 VAPI_DBG ("after dispatch, req start = %d, end = %d, count = %d",
629 ctx->requests_start, requests_end, ctx->requests_count);
631 if (0 != (mrv = pthread_mutex_unlock (&ctx->requests_mutex)))
633 VAPI_DBG ("pthread_mutex_unlock() failed, rv=%d:%s", mrv,
635 abort (); /* this really shouldn't happen */
641 vapi_dispatch_event (vapi_ctx_t ctx, vapi_msg_id_t id, void *msg)
643 if (ctx->event_cbs[id].cb)
645 return ctx->event_cbs[id].cb (ctx, ctx->event_cbs[id].ctx, msg);
647 else if (ctx->generic_cb.cb)
649 return ctx->generic_cb.cb (ctx, ctx->generic_cb.ctx, id, msg);
654 ("No handler/generic handler for msg id %u[%s], message ignored",
655 (unsigned) id, __vapi_metadata.msgs[id]->name);
661 vapi_msg_is_with_context (vapi_msg_id_t id)
663 assert (id <= __vapi_metadata.count);
664 return __vapi_metadata.msgs[id]->has_context;
668 vapi_dispatch_one (vapi_ctx_t ctx)
670 VAPI_DBG ("vapi_dispatch_one()");
673 vapi_error_e rv = vapi_recv (ctx, &msg, &size);
676 VAPI_DBG ("vapi_recv failed with rv=%d", rv);
679 u16 vpp_id = be16toh (*(u16 *) msg);
680 if (vpp_id > ctx->vl_msg_id_max)
682 VAPI_ERR ("Unknown msg ID received, id `%u', out of range <0,%u>",
683 (unsigned) vpp_id, (unsigned) ctx->vl_msg_id_max);
684 vapi_msg_free (ctx, msg);
687 if (~0 == (unsigned) ctx->vl_msg_id_to_vapi_msg_t[vpp_id])
689 VAPI_ERR ("Unknown msg ID received, id `%u' marked as not supported",
691 vapi_msg_free (ctx, msg);
694 const vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[vpp_id];
695 const size_t expect_size = vapi_get_message_size (id);
696 if (size < expect_size)
699 ("Invalid msg received, unexpected size `%zu' < expected min `%zu'",
701 vapi_msg_free (ctx, msg);
705 vapi_get_swap_to_host_func (id) (msg);
706 if (vapi_msg_is_with_context (id))
708 context = *(u32 *) (((u8 *) msg) + vapi_get_context_offset (id));
709 /* is this a message originating from VAPI? */
710 VAPI_DBG ("dispatch, context is %x", context);
711 if (context & context_counter_mask)
713 rv = vapi_dispatch_response (ctx, id, context, msg);
717 rv = vapi_dispatch_event (ctx, id, msg);
720 vapi_msg_free (ctx, msg);
725 vapi_dispatch (vapi_ctx_t ctx)
727 vapi_error_e rv = VAPI_OK;
728 while (!vapi_requests_empty (ctx))
730 rv = vapi_dispatch_one (ctx);
740 vapi_set_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id,
741 vapi_event_cb callback, void *callback_ctx)
743 vapi_event_cb_with_ctx *c = &ctx->event_cbs[id];
745 c->ctx = callback_ctx;
749 vapi_clear_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id)
751 vapi_set_event_cb (ctx, id, NULL, NULL);
755 vapi_set_generic_event_cb (vapi_ctx_t ctx, vapi_generic_event_cb callback,
758 ctx->generic_cb.cb = callback;
759 ctx->generic_cb.ctx = callback_ctx;
763 vapi_clear_generic_event_cb (vapi_ctx_t ctx)
765 ctx->generic_cb.cb = NULL;
766 ctx->generic_cb.ctx = NULL;
770 vapi_lookup_vl_msg_id (vapi_ctx_t ctx, vapi_msg_id_t id)
772 assert (id < __vapi_metadata.count);
773 return ctx->vapi_msg_id_t_to_vl_msg_id[id];
777 vapi_get_client_index (vapi_ctx_t ctx)
779 return api_main.my_client_index;
783 vapi_is_nonblocking (vapi_ctx_t ctx)
785 return (VAPI_MODE_NONBLOCKING == ctx->mode);
788 bool vapi_requests_full (vapi_ctx_t ctx);
790 size_t vapi_get_request_count (vapi_ctx_t ctx);
793 vapi_get_max_request_count (vapi_ctx_t ctx)
795 return ctx->requests_size - 1;
799 vapi_get_payload_offset (vapi_msg_id_t id)
801 assert (id < __vapi_metadata.count);
802 return __vapi_metadata.msgs[id]->payload_offset;
805 void (*vapi_get_swap_to_host_func (vapi_msg_id_t id)) (void *msg)
807 assert (id < __vapi_metadata.count);
808 return __vapi_metadata.msgs[id]->swap_to_host;
811 void (*vapi_get_swap_to_be_func (vapi_msg_id_t id)) (void *msg)
813 assert (id < __vapi_metadata.count);
814 return __vapi_metadata.msgs[id]->swap_to_be;
818 vapi_get_message_size (vapi_msg_id_t id)
820 assert (id < __vapi_metadata.count);
821 return __vapi_metadata.msgs[id]->size;
825 vapi_get_context_offset (vapi_msg_id_t id)
827 assert (id < __vapi_metadata.count);
828 return __vapi_metadata.msgs[id]->context_offset;
832 vapi_register_msg (vapi_message_desc_t * msg)
835 for (i = 0; i < __vapi_metadata.count; ++i)
838 (msg->name_with_crc, __vapi_metadata.msgs[i]->name_with_crc))
840 /* this happens if somebody is linking together several objects while
841 * using the static inline headers, just fill in the already
842 * assigned id here so that all the objects are in sync */
843 msg->id = __vapi_metadata.msgs[i]->id;
847 vapi_msg_id_t id = __vapi_metadata.count;
848 ++__vapi_metadata.count;
849 __vapi_metadata.msgs =
850 realloc (__vapi_metadata.msgs,
851 sizeof (*__vapi_metadata.msgs) * __vapi_metadata.count);
852 __vapi_metadata.msgs[id] = msg;
853 size_t s = strlen (msg->name_with_crc);
854 if (s > __vapi_metadata.max_len_name_with_crc)
856 __vapi_metadata.max_len_name_with_crc = s;
863 vapi_producer_lock (vapi_ctx_t ctx)
866 if (0 != (mrv = pthread_mutex_lock (&ctx->requests_mutex)))
868 VAPI_DBG ("pthread_mutex_lock() failed, rv=%d:%s", mrv, strerror (mrv));
869 (void) mrv; /* avoid warning if the above debug is not enabled */
870 return VAPI_MUTEX_FAILURE;
876 vapi_producer_unlock (vapi_ctx_t ctx)
879 if (0 != (mrv = pthread_mutex_unlock (&ctx->requests_mutex)))
881 VAPI_DBG ("pthread_mutex_unlock() failed, rv=%d:%s", mrv,
883 (void) mrv; /* avoid warning if the above debug is not enabled */
884 return VAPI_MUTEX_FAILURE;
890 * fd.io coding-style-patch-verification: ON
893 * eval: (c-set-style "gnu")