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-rw-r--r--src/vlibmemory/memory_shared.c852
1 files changed, 852 insertions, 0 deletions
diff --git a/src/vlibmemory/memory_shared.c b/src/vlibmemory/memory_shared.c
new file mode 100644
index 00000000000..d8d3200485e
--- /dev/null
+++ b/src/vlibmemory/memory_shared.c
@@ -0,0 +1,852 @@
+/*
+ *------------------------------------------------------------------
+ * memclnt_shared.c - API message handling, common code for both clients
+ * and the vlib process itself.
+ *
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <vppinfra/format.h>
+#include <vppinfra/byte_order.h>
+#include <vppinfra/error.h>
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlibmemory/api.h>
+#include <vlibmemory/unix_shared_memory_queue.h>
+
+#include <vlibmemory/vl_memory_msg_enum.h>
+
+#define vl_typedefs
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_typedefs
+
+static inline void *
+vl_msg_api_alloc_internal (int nbytes, int pool, int may_return_null)
+{
+ int i;
+ msgbuf_t *rv;
+ ring_alloc_t *ap;
+ unix_shared_memory_queue_t *q;
+ void *oldheap;
+ vl_shmem_hdr_t *shmem_hdr;
+ api_main_t *am = &api_main;
+
+ shmem_hdr = am->shmem_hdr;
+
+ if (shmem_hdr == 0)
+ {
+ clib_warning ("shared memory header NULL");
+ return 0;
+ }
+
+ /* account for the msgbuf_t header */
+ nbytes += sizeof (msgbuf_t);
+
+ if (shmem_hdr->vl_rings == 0)
+ {
+ clib_warning ("vl_rings NULL");
+ ASSERT (0);
+ abort ();
+ }
+
+ if (shmem_hdr->client_rings == 0)
+ {
+ clib_warning ("client_rings NULL");
+ ASSERT (0);
+ abort ();
+ }
+
+ ap = pool ? shmem_hdr->vl_rings : shmem_hdr->client_rings;
+ for (i = 0; i < vec_len (ap); i++)
+ {
+ /* Too big? */
+ if (nbytes > ap[i].size)
+ {
+ continue;
+ }
+
+ q = ap[i].rp;
+ if (pool == 0)
+ {
+ pthread_mutex_lock (&q->mutex);
+ }
+ rv = (msgbuf_t *) (&q->data[0] + q->head * q->elsize);
+ /*
+ * Is this item still in use?
+ */
+ if (rv->q)
+ {
+ /* yes, loser; try next larger pool */
+ ap[i].misses++;
+ if (pool == 0)
+ pthread_mutex_unlock (&q->mutex);
+ continue;
+ }
+ /* OK, we have a winner */
+ ap[i].hits++;
+ /*
+ * Remember the source queue, although we
+ * don't need to know the queue to free the item.
+ */
+ rv->q = q;
+ q->head++;
+ if (q->head == q->maxsize)
+ q->head = 0;
+
+ if (pool == 0)
+ pthread_mutex_unlock (&q->mutex);
+ goto out;
+ }
+
+ /*
+ * Request too big, or head element of all size-compatible rings
+ * still in use. Fall back to shared-memory malloc.
+ */
+ am->ring_misses++;
+
+ pthread_mutex_lock (&am->vlib_rp->mutex);
+ oldheap = svm_push_data_heap (am->vlib_rp);
+ if (may_return_null)
+ {
+ rv = clib_mem_alloc_or_null (nbytes);
+ if (PREDICT_FALSE (rv == 0))
+ {
+ svm_pop_heap (oldheap);
+ pthread_mutex_unlock (&am->vlib_rp->mutex);
+ return 0;
+ }
+ }
+ else
+ rv = clib_mem_alloc (nbytes);
+
+ rv->q = 0;
+ svm_pop_heap (oldheap);
+ pthread_mutex_unlock (&am->vlib_rp->mutex);
+
+out:
+ rv->data_len = htonl (nbytes - sizeof (msgbuf_t));
+ return (rv->data);
+}
+
+void *
+vl_msg_api_alloc (int nbytes)
+{
+ int pool;
+ api_main_t *am = &api_main;
+ vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+
+ /*
+ * Clients use pool-0, vlib proc uses pool 1
+ */
+ pool = (am->our_pid == shmem_hdr->vl_pid);
+ return vl_msg_api_alloc_internal (nbytes, pool, 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_or_null (int nbytes)
+{
+ int pool;
+ api_main_t *am = &api_main;
+ vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+
+ pool = (am->our_pid == shmem_hdr->vl_pid);
+ return vl_msg_api_alloc_internal (nbytes, pool, 1 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_as_if_client (int nbytes)
+{
+ return vl_msg_api_alloc_internal (nbytes, 0, 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_as_if_client_or_null (int nbytes)
+{
+ return vl_msg_api_alloc_internal (nbytes, 0, 1 /* may_return_null */ );
+}
+
+void
+vl_msg_api_free (void *a)
+{
+ msgbuf_t *rv;
+ void *oldheap;
+ api_main_t *am = &api_main;
+
+ rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));
+
+ /*
+ * Here's the beauty of the scheme. Only one proc/thread has
+ * control of a given message buffer. To free a buffer, we just clear the
+ * queue field, and leave. No locks, no hits, no errors...
+ */
+ if (rv->q)
+ {
+ rv->q = 0;
+ return;
+ }
+
+ pthread_mutex_lock (&am->vlib_rp->mutex);
+ oldheap = svm_push_data_heap (am->vlib_rp);
+ clib_mem_free (rv);
+ svm_pop_heap (oldheap);
+ pthread_mutex_unlock (&am->vlib_rp->mutex);
+}
+
+static void
+vl_msg_api_free_nolock (void *a)
+{
+ msgbuf_t *rv;
+ void *oldheap;
+ api_main_t *am = &api_main;
+
+ rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));
+ /*
+ * Here's the beauty of the scheme. Only one proc/thread has
+ * control of a given message buffer. To free a buffer, we just clear the
+ * queue field, and leave. No locks, no hits, no errors...
+ */
+ if (rv->q)
+ {
+ rv->q = 0;
+ return;
+ }
+
+ oldheap = svm_push_data_heap (am->vlib_rp);
+ clib_mem_free (rv);
+ svm_pop_heap (oldheap);
+}
+
+void
+vl_set_memory_root_path (char *name)
+{
+ api_main_t *am = &api_main;
+
+ am->root_path = name;
+}
+
+void
+vl_set_memory_uid (int uid)
+{
+ api_main_t *am = &api_main;
+
+ am->api_uid = uid;
+}
+
+void
+vl_set_memory_gid (int gid)
+{
+ api_main_t *am = &api_main;
+
+ am->api_gid = gid;
+}
+
+void
+vl_set_global_memory_baseva (u64 baseva)
+{
+ api_main_t *am = &api_main;
+
+ am->global_baseva = baseva;
+}
+
+void
+vl_set_global_memory_size (u64 size)
+{
+ api_main_t *am = &api_main;
+
+ am->global_size = size;
+}
+
+void
+vl_set_api_memory_size (u64 size)
+{
+ api_main_t *am = &api_main;
+
+ am->api_size = size;
+}
+
+void
+vl_set_global_pvt_heap_size (u64 size)
+{
+ api_main_t *am = &api_main;
+
+ am->global_pvt_heap_size = size;
+}
+
+void
+vl_set_api_pvt_heap_size (u64 size)
+{
+ api_main_t *am = &api_main;
+
+ am->api_pvt_heap_size = size;
+}
+
+int
+vl_map_shmem (char *region_name, int is_vlib)
+{
+ svm_map_region_args_t _a, *a = &_a;
+ svm_region_t *vlib_rp, *root_rp;
+ void *oldheap;
+ vl_shmem_hdr_t *shmem_hdr = 0;
+ api_main_t *am = &api_main;
+ int i;
+ struct timespec ts, tsrem;
+
+ if (is_vlib == 0)
+ svm_region_init_chroot (am->root_path);
+
+ memset (a, 0, sizeof (*a));
+
+ a->name = region_name;
+ a->size = am->api_size ? am->api_size : (16 << 20);
+ a->flags = SVM_FLAGS_MHEAP;
+ a->uid = am->api_uid;
+ a->gid = am->api_gid;
+ a->pvt_heap_size = am->api_pvt_heap_size;
+
+ vlib_rp = svm_region_find_or_create (a);
+
+ if (vlib_rp == 0)
+ return (-2);
+
+ pthread_mutex_lock (&vlib_rp->mutex);
+ /* Has someone else set up the shared-memory variable table? */
+ if (vlib_rp->user_ctx)
+ {
+ am->shmem_hdr = (void *) vlib_rp->user_ctx;
+ am->our_pid = getpid ();
+ if (is_vlib)
+ {
+ unix_shared_memory_queue_t *q;
+ uword old_msg;
+ /*
+ * application restart. Reset cached pids, API message
+ * rings, list of clients; otherwise, various things
+ * fail. (e.g. queue non-empty notification)
+ */
+
+ /* ghosts keep the region from disappearing properly */
+ svm_client_scan_this_region_nolock (vlib_rp);
+ am->shmem_hdr->application_restarts++;
+ q = am->shmem_hdr->vl_input_queue;
+ am->shmem_hdr->vl_pid = getpid ();
+ q->consumer_pid = am->shmem_hdr->vl_pid;
+ /* Drain the input queue, freeing msgs */
+ for (i = 0; i < 10; i++)
+ {
+ if (pthread_mutex_trylock (&q->mutex) == 0)
+ {
+ pthread_mutex_unlock (&q->mutex);
+ goto mutex_ok;
+ }
+ ts.tv_sec = 0;
+ ts.tv_nsec = 10000 * 1000; /* 10 ms */
+ while (nanosleep (&ts, &tsrem) < 0)
+ ts = tsrem;
+ }
+ /* Mutex buggered, "fix" it */
+ memset (&q->mutex, 0, sizeof (q->mutex));
+ clib_warning ("forcibly release main input queue mutex");
+
+ mutex_ok:
+ am->vlib_rp = vlib_rp;
+ while (unix_shared_memory_queue_sub (q,
+ (u8 *) & old_msg,
+ 1 /* nowait */ )
+ != -2 /* queue underflow */ )
+ {
+ vl_msg_api_free_nolock ((void *) old_msg);
+ am->shmem_hdr->restart_reclaims++;
+ }
+ pthread_mutex_unlock (&vlib_rp->mutex);
+ root_rp = svm_get_root_rp ();
+ ASSERT (root_rp);
+ /* Clean up the root region client list */
+ pthread_mutex_lock (&root_rp->mutex);
+ svm_client_scan_this_region_nolock (root_rp);
+ pthread_mutex_unlock (&root_rp->mutex);
+ }
+ else
+ {
+ pthread_mutex_unlock (&vlib_rp->mutex);
+ }
+ am->vlib_rp = vlib_rp;
+ vec_add1 (am->mapped_shmem_regions, vlib_rp);
+ return 0;
+ }
+ /* Clients simply have to wait... */
+ if (!is_vlib)
+ {
+ pthread_mutex_unlock (&vlib_rp->mutex);
+
+ /* Wait up to 100 seconds... */
+ for (i = 0; i < 10000; i++)
+ {
+ ts.tv_sec = 0;
+ ts.tv_nsec = 10000 * 1000; /* 10 ms */
+ while (nanosleep (&ts, &tsrem) < 0)
+ ts = tsrem;
+ if (vlib_rp->user_ctx)
+ goto ready;
+ }
+ /* Clean up and leave... */
+ svm_region_unmap (vlib_rp);
+ clib_warning ("region init fail");
+ return (-2);
+
+ ready:
+ am->shmem_hdr = (void *) vlib_rp->user_ctx;
+ am->our_pid = getpid ();
+ am->vlib_rp = vlib_rp;
+ vec_add1 (am->mapped_shmem_regions, vlib_rp);
+ return 0;
+ }
+
+ /* Nope, it's our problem... */
+
+ oldheap = svm_push_data_heap (vlib_rp);
+
+ vec_validate (shmem_hdr, 0);
+ shmem_hdr->version = VL_SHM_VERSION;
+
+ /* vlib main input queue */
+ shmem_hdr->vl_input_queue =
+ unix_shared_memory_queue_init (1024, sizeof (uword), getpid (),
+ am->vlib_signal);
+
+ /* Set up the msg ring allocator */
+#define _(sz,n) \
+ do { \
+ ring_alloc_t _rp; \
+ _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
+ _rp.size = (sz); \
+ _rp.nitems = n; \
+ _rp.hits = 0; \
+ _rp.misses = 0; \
+ vec_add1(shmem_hdr->vl_rings, _rp); \
+ } while (0);
+
+ foreach_vl_aring_size;
+#undef _
+
+#define _(sz,n) \
+ do { \
+ ring_alloc_t _rp; \
+ _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
+ _rp.size = (sz); \
+ _rp.nitems = n; \
+ _rp.hits = 0; \
+ _rp.misses = 0; \
+ vec_add1(shmem_hdr->client_rings, _rp); \
+ } while (0);
+
+ foreach_clnt_aring_size;
+#undef _
+
+ am->shmem_hdr = shmem_hdr;
+ am->vlib_rp = vlib_rp;
+ am->our_pid = getpid ();
+ if (is_vlib)
+ am->shmem_hdr->vl_pid = am->our_pid;
+
+ svm_pop_heap (oldheap);
+
+ /*
+ * After absolutely everything that a client might see is set up,
+ * declare the shmem region valid
+ */
+ vlib_rp->user_ctx = shmem_hdr;
+
+ pthread_mutex_unlock (&vlib_rp->mutex);
+ vec_add1 (am->mapped_shmem_regions, vlib_rp);
+ return 0;
+}
+
+void
+vl_register_mapped_shmem_region (svm_region_t * rp)
+{
+ api_main_t *am = &api_main;
+
+ vec_add1 (am->mapped_shmem_regions, rp);
+}
+
+void
+vl_unmap_shmem (void)
+{
+ svm_region_t *rp;
+ int i;
+ api_main_t *am = &api_main;
+
+ if (!svm_get_root_rp ())
+ return;
+
+ for (i = 0; i < vec_len (am->mapped_shmem_regions); i++)
+ {
+ rp = am->mapped_shmem_regions[i];
+ svm_region_unmap (rp);
+ }
+
+ vec_free (am->mapped_shmem_regions);
+ am->shmem_hdr = 0;
+
+ svm_region_exit ();
+ /* $$$ more careful cleanup, valgrind run... */
+ vec_free (am->msg_handlers);
+ vec_free (am->msg_endian_handlers);
+ vec_free (am->msg_print_handlers);
+}
+
+void
+vl_msg_api_send_shmem (unix_shared_memory_queue_t * q, u8 * elem)
+{
+ api_main_t *am = &api_main;
+ uword *trace = (uword *) elem;
+
+ if (am->tx_trace && am->tx_trace->enabled)
+ vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);
+
+ (void) unix_shared_memory_queue_add (q, elem, 0 /* nowait */ );
+}
+
+void
+vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t * q, u8 * elem)
+{
+ api_main_t *am = &api_main;
+ uword *trace = (uword *) elem;
+
+ if (am->tx_trace && am->tx_trace->enabled)
+ vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);
+
+ (void) unix_shared_memory_queue_add_nolock (q, elem);
+}
+
+static void
+vl_api_memclnt_create_reply_t_handler (vl_api_memclnt_create_reply_t * mp)
+{
+ serialize_main_t _sm, *sm = &_sm;
+ api_main_t *am = &api_main;
+ u8 *tblv;
+ u32 nmsgs;
+ int i;
+ u8 *name_and_crc;
+ u32 msg_index;
+
+ am->my_client_index = mp->index;
+ am->my_registration = (vl_api_registration_t *) (uword) mp->handle;
+
+ /* Clean out any previous hash table (unlikely) */
+ if (am->msg_index_by_name_and_crc)
+ {
+ int i;
+ u8 **keys = 0;
+ hash_pair_t *hp;
+ /* *INDENT-OFF* */
+ hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
+ ({
+ vec_add1 (keys, (u8 *) hp->key);
+ }));
+ /* *INDENT-ON* */
+ for (i = 0; i < vec_len (keys); i++)
+ vec_free (keys[i]);
+ vec_free (keys);
+ }
+
+ am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword));
+
+ /* Recreate the vnet-side API message handler table */
+ tblv = (u8 *) mp->message_table;
+ serialize_open_vector (sm, tblv);
+ unserialize_integer (sm, &nmsgs, sizeof (u32));
+
+ for (i = 0; i < nmsgs; i++)
+ {
+ msg_index = unserialize_likely_small_unsigned_integer (sm);
+ unserialize_cstring (sm, (char **) &name_and_crc);
+ hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index);
+ }
+}
+
+u32
+vl_api_get_msg_index (u8 * name_and_crc)
+{
+ api_main_t *am = &api_main;
+ uword *p;
+
+ if (am->msg_index_by_name_and_crc)
+ {
+ p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc);
+ if (p)
+ return p[0];
+ }
+ return ~0;
+}
+
+int
+vl_client_connect (char *name, int ctx_quota, int input_queue_size)
+{
+ svm_region_t *svm;
+ vl_api_memclnt_create_t *mp;
+ vl_api_memclnt_create_reply_t *rp;
+ unix_shared_memory_queue_t *vl_input_queue;
+ vl_shmem_hdr_t *shmem_hdr;
+ int rv = 0;
+ void *oldheap;
+ api_main_t *am = &api_main;
+
+ if (am->my_registration)
+ {
+ clib_warning ("client %s already connected...", name);
+ return -1;
+ }
+
+ if (am->vlib_rp == 0)
+ {
+ clib_warning ("am->vlib_rp NULL");
+ return -1;
+ }
+
+ svm = am->vlib_rp;
+ shmem_hdr = am->shmem_hdr;
+
+ if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0)
+ {
+ clib_warning ("shmem_hdr / input queue NULL");
+ return -1;
+ }
+
+ pthread_mutex_lock (&svm->mutex);
+ oldheap = svm_push_data_heap (svm);
+ vl_input_queue =
+ unix_shared_memory_queue_init (input_queue_size, sizeof (uword),
+ getpid (), 0);
+ pthread_mutex_unlock (&svm->mutex);
+ svm_pop_heap (oldheap);
+
+ am->my_client_index = ~0;
+ am->my_registration = 0;
+ am->vl_input_queue = vl_input_queue;
+
+ mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_create_t));
+ memset (mp, 0, sizeof (*mp));
+ mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_CREATE);
+ mp->ctx_quota = ctx_quota;
+ mp->input_queue = (uword) vl_input_queue;
+ strncpy ((char *) mp->name, name, sizeof (mp->name) - 1);
+
+ vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
+
+ while (1)
+ {
+ int qstatus;
+ struct timespec ts, tsrem;
+ int i;
+
+ /* Wait up to 10 seconds */
+ for (i = 0; i < 1000; i++)
+ {
+ qstatus = unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp,
+ 1 /* nowait */ );
+ if (qstatus == 0)
+ goto read_one_msg;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 10000 * 1000; /* 10 ms */
+ while (nanosleep (&ts, &tsrem) < 0)
+ ts = tsrem;
+ }
+ /* Timeout... */
+ clib_warning ("memclnt_create_reply timeout");
+ return -1;
+
+ read_one_msg:
+ if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_CREATE_REPLY)
+ {
+ clib_warning ("unexpected reply: id %d", ntohs (rp->_vl_msg_id));
+ continue;
+ }
+ rv = clib_net_to_host_u32 (rp->response);
+
+ vl_msg_api_handler ((void *) rp);
+ break;
+ }
+ return (rv);
+}
+
+static void
+vl_api_memclnt_delete_reply_t_handler (vl_api_memclnt_delete_reply_t * mp)
+{
+ void *oldheap;
+ api_main_t *am = &api_main;
+
+ pthread_mutex_lock (&am->vlib_rp->mutex);
+ oldheap = svm_push_data_heap (am->vlib_rp);
+ unix_shared_memory_queue_free (am->vl_input_queue);
+ pthread_mutex_unlock (&am->vlib_rp->mutex);
+ svm_pop_heap (oldheap);
+
+ am->my_client_index = ~0;
+ am->my_registration = 0;
+ am->vl_input_queue = 0;
+}
+
+void
+vl_client_disconnect (void)
+{
+ vl_api_memclnt_delete_t *mp;
+ vl_api_memclnt_delete_reply_t *rp;
+ unix_shared_memory_queue_t *vl_input_queue;
+ vl_shmem_hdr_t *shmem_hdr;
+ time_t begin;
+ api_main_t *am = &api_main;
+
+ ASSERT (am->vlib_rp);
+ shmem_hdr = am->shmem_hdr;
+ ASSERT (shmem_hdr && shmem_hdr->vl_input_queue);
+
+ vl_input_queue = am->vl_input_queue;
+
+ mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_delete_t));
+ memset (mp, 0, sizeof (*mp));
+ mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_DELETE);
+ mp->index = am->my_client_index;
+ mp->handle = (uword) am->my_registration;
+
+ vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
+
+ /*
+ * Have to be careful here, in case the client is disconnecting
+ * because e.g. the vlib process died, or is unresponsive.
+ */
+
+ begin = time (0);
+ while (1)
+ {
+ time_t now;
+
+ now = time (0);
+
+ if (now >= (begin + 2))
+ {
+ clib_warning ("peer unresponsive, give up");
+ am->my_client_index = ~0;
+ am->my_registration = 0;
+ am->shmem_hdr = 0;
+ break;
+ }
+ if (unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp, 1) < 0)
+ continue;
+
+ /* drain the queue */
+ if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY)
+ {
+ vl_msg_api_handler ((void *) rp);
+ continue;
+ }
+ vl_msg_api_handler ((void *) rp);
+ break;
+ }
+}
+
+static inline vl_api_registration_t *
+vl_api_client_index_to_registration_internal (u32 handle)
+{
+ vl_api_registration_t **regpp;
+ vl_api_registration_t *regp;
+ api_main_t *am = &api_main;
+ u32 index;
+
+ index = vl_msg_api_handle_get_index (handle);
+ if ((am->shmem_hdr->application_restarts & VL_API_EPOCH_MASK)
+ != vl_msg_api_handle_get_epoch (handle))
+ {
+ vl_msg_api_increment_missing_client_counter ();
+ return 0;
+ }
+
+ regpp = am->vl_clients + index;
+
+ if (pool_is_free (am->vl_clients, regpp))
+ {
+ vl_msg_api_increment_missing_client_counter ();
+ return 0;
+ }
+ regp = *regpp;
+ return (regp);
+}
+
+vl_api_registration_t *
+vl_api_client_index_to_registration (u32 index)
+{
+ return (vl_api_client_index_to_registration_internal (index));
+}
+
+unix_shared_memory_queue_t *
+vl_api_client_index_to_input_queue (u32 index)
+{
+ vl_api_registration_t *regp;
+ api_main_t *am = &api_main;
+
+ /* Special case: vlib trying to send itself a message */
+ if (index == (u32) ~ 0)
+ return (am->shmem_hdr->vl_input_queue);
+
+ regp = vl_api_client_index_to_registration_internal (index);
+ if (!regp)
+ return 0;
+ return (regp->vl_input_queue);
+}
+
+#define foreach_api_client_msg \
+_(MEMCLNT_CREATE_REPLY, memclnt_create_reply) \
+_(MEMCLNT_DELETE_REPLY, memclnt_delete_reply)
+
+int
+vl_client_api_map (char *region_name)
+{
+ int rv;
+
+ if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0)
+ {
+ return rv;
+ }
+
+#define _(N,n) \
+ vl_msg_api_set_handlers(VL_API_##N, 0 /* name */, \
+ vl_api_##n##_t_handler, \
+ 0/* cleanup */, 0/* endian */, 0/* print */, \
+ sizeof(vl_api_##n##_t), 1);
+ foreach_api_client_msg;
+#undef _
+ return 0;
+}
+
+void
+vl_client_api_unmap (void)
+{
+ vl_unmap_shmem ();
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */