summaryrefslogtreecommitdiffstats
path: root/src/vlibapi/memory_shared.c
diff options
context:
space:
mode:
authorDamjan Marion <damarion@cisco.com>2022-05-20 13:05:38 +0200
committerOle Tr�an <otroan@employees.org>2022-09-26 08:12:57 +0000
commitb70497124840fb6d9e8e5cf7239a41cb2bc7013c (patch)
tree090c957135d3e99db69d74ef5091bab8aaa21490 /src/vlibapi/memory_shared.c
parent617d429d2e38ac0cdb107dbfd86301b36d9f8e31 (diff)
api: keep api common code in vlibapi
Type: refactor Change-Id: I6edbff9a02fcb3c592ccfe8f47ddb3f848be1b6d Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vlibapi/memory_shared.c')
-rw-r--r--src/vlibapi/memory_shared.c817
1 files changed, 817 insertions, 0 deletions
diff --git a/src/vlibapi/memory_shared.c b/src/vlibapi/memory_shared.c
new file mode 100644
index 00000000000..77a610b9434
--- /dev/null
+++ b/src/vlibapi/memory_shared.c
@@ -0,0 +1,817 @@
+/*
+ *------------------------------------------------------------------
+ * 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 <vppinfra/elog.h>
+#include <svm/queue.h>
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlibmemory/memory_api.h>
+#include <vlibmemory/vl_memory_msg_enum.h>
+#include <vlibapi/api_common.h>
+
+#define vl_typedefs
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_typedefs
+
+#define DEBUG_MESSAGE_BUFFER_OVERRUN 0
+
+__clib_nosanitize_addr static inline void *
+vl_msg_api_alloc_internal (svm_region_t *vlib_rp, int nbytes, int pool,
+ int may_return_null)
+{
+ int i;
+ msgbuf_t *rv;
+ ring_alloc_t *ap;
+ svm_queue_t *q;
+ void *oldheap;
+ vl_shmem_hdr_t *shmem_hdr;
+ api_main_t *am = vlibapi_get_main ();
+
+ shmem_hdr = (void *) vlib_rp->user_ctx;
+
+#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
+ nbytes += 4;
+#endif
+
+ ASSERT (pool == 0 || vlib_get_thread_index () == 0);
+
+ 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)
+ {
+ u32 now = (u32) time (0);
+
+ if (PREDICT_TRUE (rv->gc_mark_timestamp == 0))
+ rv->gc_mark_timestamp = now;
+ else
+ {
+ if (now - rv->gc_mark_timestamp > 10)
+ {
+ if (CLIB_DEBUG > 0)
+ {
+ u16 *msg_idp, msg_id;
+ vl_api_msg_data_t *m;
+ clib_warning
+ ("garbage collect pool %d ring %d index %d", pool, i,
+ q->head);
+ msg_idp = (u16 *) (rv->data);
+ msg_id = clib_net_to_host_u16 (*msg_idp);
+ m = vl_api_get_msg_data (am, msg_id);
+ if (m)
+ clib_warning ("msg id %d name %s", (u32) msg_id,
+ m->name);
+ }
+ shmem_hdr->garbage_collects++;
+ goto collected;
+ }
+ }
+
+
+ /* yes, loser; try next larger pool */
+ ap[i].misses++;
+ if (pool == 0)
+ pthread_mutex_unlock (&q->mutex);
+ continue;
+ }
+ collected:
+
+ /* 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;
+ rv->gc_mark_timestamp = 0;
+ 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++;
+
+ oldheap = vl_msg_push_heap_w_region (vlib_rp);
+ if (may_return_null)
+ {
+ rv = clib_mem_alloc_or_null (nbytes);
+ if (PREDICT_FALSE (rv == 0))
+ {
+ vl_msg_pop_heap_w_region (vlib_rp, oldheap);
+ return 0;
+ }
+ }
+ else
+ rv = clib_mem_alloc (nbytes);
+
+ rv->q = 0;
+ rv->gc_mark_timestamp = 0;
+ vl_msg_pop_heap_w_region (vlib_rp, oldheap);
+
+out:
+#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
+ {
+ nbytes -= 4;
+ u32 *overrun;
+ overrun = (u32 *) (rv->data + nbytes - sizeof (msgbuf_t));
+ *overrun = 0x1badbabe;
+ }
+#endif
+ rv->data_len = htonl (nbytes - sizeof (msgbuf_t));
+
+ VL_MSG_API_UNPOISON (rv->data);
+ return (rv->data);
+}
+
+void *
+vl_msg_api_alloc (int nbytes)
+{
+ int pool;
+ api_main_t *am = vlibapi_get_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 (am->vlib_rp, nbytes, pool,
+ 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_zero (int nbytes)
+{
+ void *ret;
+
+ ret = vl_msg_api_alloc (nbytes);
+ clib_memset (ret, 0, nbytes);
+ return ret;
+}
+
+void *
+vl_msg_api_alloc_or_null (int nbytes)
+{
+ int pool;
+ api_main_t *am = vlibapi_get_main ();
+ vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+
+ pool = (am->our_pid == shmem_hdr->vl_pid);
+ return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, pool,
+ 1 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_as_if_client (int nbytes)
+{
+ api_main_t *am = vlibapi_get_main ();
+ return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, 0,
+ 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_zero_as_if_client (int nbytes)
+{
+ void *ret;
+
+ ret = vl_msg_api_alloc_as_if_client (nbytes);
+ clib_memset (ret, 0, nbytes);
+ return ret;
+}
+
+void *
+vl_msg_api_alloc_as_if_client_or_null (int nbytes)
+{
+ api_main_t *am = vlibapi_get_main ();
+ return vl_msg_api_alloc_internal (am->vlib_rp, nbytes, 0,
+ 1 /* may_return_null */ );
+}
+
+void *
+vl_mem_api_alloc_as_if_client_w_reg (vl_api_registration_t * reg, int nbytes)
+{
+ return vl_msg_api_alloc_internal (reg->vlib_rp, nbytes, 0,
+ 0 /* may_return_null */ );
+}
+
+void
+vl_msg_api_free_w_region (svm_region_t * vlib_rp, void *a)
+{
+ msgbuf_t *rv;
+ void *oldheap;
+
+ 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;
+ rv->gc_mark_timestamp = 0;
+#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
+ {
+ u32 *overrun;
+ overrun = (u32 *) (rv->data + ntohl (rv->data_len));
+ ASSERT (*overrun == 0x1badbabe);
+ }
+#endif
+ VL_MSG_API_POISON (rv->data);
+ return;
+ }
+
+ oldheap = vl_msg_push_heap_w_region (vlib_rp);
+
+#if DEBUG_MESSAGE_BUFFER_OVERRUN > 0
+ {
+ u32 *overrun;
+ overrun = (u32 *) (rv->data + ntohl (rv->data_len));
+ ASSERT (*overrun == 0x1badbabe);
+ }
+#endif
+
+ clib_mem_free (rv);
+ vl_msg_pop_heap_w_region (vlib_rp, oldheap);
+}
+
+void
+vl_msg_api_free (void *a)
+{
+ api_main_t *am = vlibapi_get_main ();
+ vl_msg_api_free_w_region (am->vlib_rp, a);
+}
+
+static void
+vl_msg_api_free_nolock (void *a)
+{
+ msgbuf_t *rv;
+ void *oldheap;
+ api_main_t *am = vlibapi_get_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;
+ VL_MSG_API_POISON (rv->data);
+ return;
+ }
+
+ oldheap = svm_push_data_heap (am->vlib_rp);
+ clib_mem_free (rv);
+ svm_pop_heap (oldheap);
+}
+
+void
+vl_set_memory_root_path (const char *name)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->root_path = name;
+}
+
+void
+vl_set_memory_uid (int uid)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->api_uid = uid;
+}
+
+void
+vl_set_memory_gid (int gid)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->api_gid = gid;
+}
+
+void
+vl_set_global_memory_baseva (u64 baseva)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->global_baseva = baseva;
+}
+
+void
+vl_set_global_memory_size (u64 size)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->global_size = size;
+}
+
+void
+vl_set_api_memory_size (u64 size)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->api_size = size;
+}
+
+void
+vl_set_global_pvt_heap_size (u64 size)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->global_pvt_heap_size = size;
+}
+
+void
+vl_set_api_pvt_heap_size (u64 size)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ am->api_pvt_heap_size = size;
+}
+
+static void
+vl_api_default_mem_config (vl_shmem_hdr_t * shmem_hdr)
+{
+ api_main_t *am = vlibapi_get_main ();
+ u32 vlib_input_queue_length;
+
+ /* vlib main input queue */
+ vlib_input_queue_length = 1024;
+ if (am->vlib_input_queue_length)
+ vlib_input_queue_length = am->vlib_input_queue_length;
+
+ shmem_hdr->vl_input_queue =
+ svm_queue_alloc_and_init (vlib_input_queue_length, sizeof (uword),
+ getpid ());
+
+#define _(sz,n) \
+ do { \
+ ring_alloc_t _rp; \
+ _rp.rp = svm_queue_alloc_and_init ((n), (sz), 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 = svm_queue_alloc_and_init ((n), (sz), 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 _
+}
+
+void
+vl_api_mem_config (vl_shmem_hdr_t * hdr, vl_api_shm_elem_config_t * config)
+{
+ vl_api_shm_elem_config_t *c;
+ ring_alloc_t *rp;
+ u32 size;
+
+ if (!config)
+ {
+ vl_api_default_mem_config (hdr);
+ return;
+ }
+
+ vec_foreach (c, config)
+ {
+ switch (c->type)
+ {
+ case VL_API_QUEUE:
+ hdr->vl_input_queue = svm_queue_alloc_and_init (c->count, c->size,
+ getpid ());
+ continue;
+ case VL_API_VLIB_RING:
+ vec_add2 (hdr->vl_rings, rp, 1);
+ break;
+ case VL_API_CLIENT_RING:
+ vec_add2 (hdr->client_rings, rp, 1);
+ break;
+ default:
+ clib_warning ("unknown config type: %d", c->type);
+ continue;
+ }
+
+ size = sizeof (ring_alloc_t) + c->size;
+ rp->rp = svm_queue_alloc_and_init (c->count, size, 0);
+ rp->size = size;
+ rp->nitems = c->count;
+ rp->hits = 0;
+ rp->misses = 0;
+ }
+}
+
+void
+vl_init_shmem (svm_region_t * vlib_rp, vl_api_shm_elem_config_t * config,
+ int is_vlib, int is_private_region)
+{
+ api_main_t *am = vlibapi_get_main ();
+ vl_shmem_hdr_t *shmem_hdr = 0;
+ void *oldheap;
+ ASSERT (vlib_rp);
+
+ /* $$$$ need private region config parameters */
+
+ oldheap = svm_push_data_heap (vlib_rp);
+
+ vec_validate (shmem_hdr, 0);
+ shmem_hdr->version = VL_SHM_VERSION;
+ shmem_hdr->clib_file_index = VL_API_INVALID_FI;
+
+ /* Set up the queue and msg ring allocator */
+ vl_api_mem_config (shmem_hdr, config);
+
+ if (is_private_region == 0)
+ {
+ 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;
+ }
+ else
+ 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);
+}
+
+int
+vl_map_shmem (const char *region_name, int is_vlib)
+{
+ svm_map_region_args_t _a, *a = &_a;
+ svm_region_t *vlib_rp, *root_rp;
+ api_main_t *am = vlibapi_get_main ();
+ int i;
+ struct timespec ts, tsrem;
+ char *vpe_api_region_suffix = "-vpe-api";
+
+ clib_memset (a, 0, sizeof (*a));
+
+ if (strstr (region_name, vpe_api_region_suffix))
+ {
+ u8 *root_path = format (0, "%s", region_name);
+ vec_set_len (root_path,
+ vec_len (root_path) - strlen (vpe_api_region_suffix));
+ vec_terminate_c_string (root_path);
+ a->root_path = (const char *) root_path;
+ am->root_path = (const char *) root_path;
+ }
+
+ if (is_vlib == 0)
+ {
+ int tfd;
+ u8 *api_name;
+ /*
+ * Clients wait for vpp to set up the root / API regioins
+ */
+ if (am->root_path)
+ api_name = format (0, "/dev/shm/%s-%s%c", am->root_path,
+ region_name + 1, 0);
+ else
+ api_name = format (0, "/dev/shm%s%c", region_name, 0);
+
+ /* 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;
+ tfd = open ((char *) api_name, O_RDWR);
+ if (tfd >= 0)
+ break;
+ }
+ vec_free (api_name);
+ if (tfd < 0)
+ {
+ clib_warning ("region init fail");
+ return -2;
+ }
+ close (tfd);
+ svm_region_init_chroot_uid_gid (am->root_path, getuid (), getgid ());
+ }
+
+ if (a->root_path != NULL)
+ {
+ a->name = "/vpe-api";
+ }
+ else
+ 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)
+ {
+ svm_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 */
+ clib_memset (&q->mutex, 0, sizeof (q->mutex));
+ clib_warning ("forcibly release main input queue mutex");
+
+ mutex_ok:
+ am->vlib_rp = vlib_rp;
+ while (svm_queue_sub (q, (u8 *) & old_msg, SVM_Q_NOWAIT, 0)
+ != -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... */
+ vl_init_shmem (vlib_rp, 0 /* default config */ , 1 /* is vlib */ ,
+ 0 /* is_private_region */ );
+
+ vec_add1 (am->mapped_shmem_regions, vlib_rp);
+ return 0;
+}
+
+void
+vl_register_mapped_shmem_region (svm_region_t * rp)
+{
+ api_main_t *am = vlibapi_get_main ();
+
+ vec_add1 (am->mapped_shmem_regions, rp);
+}
+
+static void
+vl_unmap_shmem_internal (u8 is_client)
+{
+ svm_region_t *rp;
+ int i;
+ api_main_t *am = vlibapi_get_main ();
+
+ if (!svm_get_root_rp ())
+ return;
+
+ for (i = 0; i < vec_len (am->mapped_shmem_regions); i++)
+ {
+ rp = am->mapped_shmem_regions[i];
+ is_client ? svm_region_unmap_client (rp) : svm_region_unmap (rp);
+ }
+
+ vec_free (am->mapped_shmem_regions);
+ am->shmem_hdr = 0;
+
+ is_client ? svm_region_exit_client () : svm_region_exit ();
+
+ vec_free (am->msg_data);
+}
+
+void
+vl_unmap_shmem (void)
+{
+ vl_unmap_shmem_internal (0);
+}
+
+void
+vl_unmap_shmem_client (void)
+{
+ vl_unmap_shmem_internal (1);
+}
+
+void
+vl_msg_api_send_shmem (svm_queue_t * q, u8 * elem)
+{
+ api_main_t *am = vlibapi_get_main ();
+ void *msg = (void *) *(uword *) elem;
+
+ if (am->tx_trace && am->tx_trace->enabled)
+ vl_msg_api_trace (am, am->tx_trace, msg);
+
+ /*
+ * Announce a probable binary API client bug:
+ * some client's input queue is stuffed.
+ * The situation may be recoverable, or not.
+ */
+ if (PREDICT_FALSE
+ (am->vl_clients /* vpp side */ && (q->cursize == q->maxsize)))
+ {
+ if (PREDICT_FALSE (am->elog_trace_api_messages))
+ {
+ /* *INDENT-OFF* */
+ ELOG_TYPE_DECLARE (e) =
+ {
+ .format = "api-client-queue-stuffed: %x%x",
+ .format_args = "i4i4",
+ };
+ /* *INDENT-ON* */
+ struct
+ {
+ u32 hi, low;
+ } *ed;
+ ed = ELOG_DATA (am->elog_main, e);
+ ed->hi = (uword) q >> 32;
+ ed->low = (uword) q & 0xFFFFFFFF;
+ clib_warning ("WARNING: client input queue at %llx is stuffed...",
+ q);
+ }
+ }
+ VL_MSG_API_POISON (msg);
+ (void) svm_queue_add (q, elem, 0 /* nowait */ );
+}
+
+int
+vl_mem_api_can_send (svm_queue_t * q)
+{
+ return (q->cursize < q->maxsize);
+}
+
+void
+vl_msg_api_send_shmem_nolock (svm_queue_t * q, u8 * elem)
+{
+ api_main_t *am = vlibapi_get_main ();
+ void *msg = (void *) *(uword *) elem;
+
+ if (am->tx_trace && am->tx_trace->enabled)
+ vl_msg_api_trace (am, am->tx_trace, msg);
+
+ (void) svm_queue_add_nolock (q, elem);
+ VL_MSG_API_POISON (msg);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */