6855f6cdfe
See: https://wiki.fd.io/view/VPP/Python_API Change-Id: If135fc32208c7031787e1935b399d930e0e1ea1f Signed-off-by: Ole Troan <ot@cisco.com>
687 lines
19 KiB
C
687 lines
19 KiB
C
/*
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*------------------------------------------------------------------
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* memclnt_shared.c - API message handling, common code for both clients
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* and the vlib process itself.
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*
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*
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* Copyright (c) 2009 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <vppinfra/format.h>
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#include <vppinfra/byte_order.h>
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#include <vppinfra/error.h>
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#include <vlib/vlib.h>
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#include <vlib/unix/unix.h>
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#include <vlibmemory/api.h>
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#include <vlibmemory/unix_shared_memory_queue.h>
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#include <vlibmemory/vl_memory_msg_enum.h>
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#define vl_typedefs
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#include <vlibmemory/vl_memory_api_h.h>
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#undef vl_typedefs
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static inline void *vl_msg_api_alloc_internal(int nbytes, int pool)
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{
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int i;
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msgbuf_t *rv;
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ring_alloc_t *ap;
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unix_shared_memory_queue_t *q;
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void *oldheap;
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vl_shmem_hdr_t *shmem_hdr;
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api_main_t *am = &api_main;
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shmem_hdr = am->shmem_hdr;
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if (shmem_hdr == 0) {
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clib_warning ("shared memory header NULL");
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return 0;
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}
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/* account for the msgbuf_t header*/
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nbytes += sizeof(msgbuf_t);
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if (shmem_hdr->vl_rings == 0) {
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clib_warning ("vl_rings NULL");
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return 0;
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}
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if (shmem_hdr->client_rings == 0) {
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clib_warning ("client_rings NULL");
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return 0;
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}
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ap = pool ? shmem_hdr->vl_rings : shmem_hdr->client_rings;
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for (i = 0; i < vec_len (ap); i++) {
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/* Too big? */
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if (nbytes > ap[i].size) {
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continue;
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}
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q = ap[i].rp;
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if (pool == 0) {
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pthread_mutex_lock(&q->mutex);
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}
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rv = (msgbuf_t *) (&q->data[0] + q->head*q->elsize);
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/*
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* Is this item still in use?
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*/
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if (rv->q) {
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/* yes, loser; try next larger pool */
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ap[i].misses++;
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if (pool == 0)
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pthread_mutex_unlock(&q->mutex);
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continue;
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}
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/* OK, we have a winner */
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ap[i].hits++;
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/*
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* Remember the source queue, although we
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* don't need to know the queue to free the item.
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*/
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rv->q = q;
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q->head++;
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if (q->head == q->maxsize)
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q->head = 0;
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if (pool == 0)
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pthread_mutex_unlock(&q->mutex);
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goto out;
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}
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/*
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* Request too big, or head element of all size-compatible rings
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* still in use. Fall back to shared-memory malloc.
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*/
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am->ring_misses++;
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pthread_mutex_lock (&am->vlib_rp->mutex);
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oldheap = svm_push_data_heap (am->vlib_rp);
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rv = clib_mem_alloc(nbytes);
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rv->q = 0;
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svm_pop_heap (oldheap);
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pthread_mutex_unlock (&am->vlib_rp->mutex);
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out:
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rv->data_len = htonl(nbytes - sizeof(msgbuf_t));
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return(rv->data);
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}
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void *vl_msg_api_alloc (int nbytes)
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{
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int pool;
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api_main_t *am = &api_main;
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vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
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/*
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* Clients use pool-0, vlib proc uses pool 1
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*/
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pool = (am->our_pid == shmem_hdr->vl_pid);
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return vl_msg_api_alloc_internal (nbytes, pool);
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}
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void *vl_msg_api_alloc_as_if_client (int nbytes)
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{
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return vl_msg_api_alloc_internal (nbytes, 0);
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}
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void vl_msg_api_free(void *a)
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{
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msgbuf_t *rv;
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void *oldheap;
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api_main_t *am = &api_main;
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rv = (msgbuf_t *)(((u8 *)a) - offsetof(msgbuf_t, data));
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/*
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* Here's the beauty of the scheme. Only one proc/thread has
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* control of a given message buffer. To free a buffer, we just clear the
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* queue field, and leave. No locks, no hits, no errors...
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*/
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if (rv->q) {
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rv->q = 0;
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return;
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}
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pthread_mutex_lock (&am->vlib_rp->mutex);
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oldheap = svm_push_data_heap (am->vlib_rp);
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clib_mem_free (rv);
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svm_pop_heap (oldheap);
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pthread_mutex_unlock (&am->vlib_rp->mutex);
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}
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static void vl_msg_api_free_nolock (void *a)
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{
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msgbuf_t *rv;
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void *oldheap;
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api_main_t *am = &api_main;
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rv = (msgbuf_t *)(((u8 *)a) - offsetof(msgbuf_t, data));
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/*
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* Here's the beauty of the scheme. Only one proc/thread has
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* control of a given message buffer. To free a buffer, we just clear the
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* queue field, and leave. No locks, no hits, no errors...
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*/
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if (rv->q) {
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rv->q = 0;
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return;
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}
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oldheap = svm_push_data_heap (am->vlib_rp);
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clib_mem_free (rv);
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svm_pop_heap (oldheap);
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}
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void vl_set_memory_root_path (char *name)
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{
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api_main_t *am = &api_main;
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am->root_path = name;
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}
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int vl_map_shmem (char *region_name, int is_vlib)
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{
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svm_map_region_args_t *a = 0;
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svm_region_t *vlib_rp, *root_rp;
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void *oldheap;
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vl_shmem_hdr_t *shmem_hdr=0;
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api_main_t *am = &api_main;
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int i;
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struct timespec ts, tsrem;
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if (is_vlib == 0)
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svm_region_init_chroot(am->root_path);
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vec_validate (a, 0);
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a->name = region_name;
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a->size = 16<<20;
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a->flags = SVM_FLAGS_MHEAP;
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vlib_rp = svm_region_find_or_create (a);
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vec_free (a);
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if (vlib_rp == 0)
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return (-2);
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pthread_mutex_lock (&vlib_rp->mutex);
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/* Has someone else set up the shared-memory variable table? */
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if (vlib_rp->user_ctx) {
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am->shmem_hdr = (void *) vlib_rp->user_ctx;
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am->our_pid = getpid();
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if (is_vlib) {
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unix_shared_memory_queue_t *q;
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uword old_msg;
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/*
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* application restart. Reset cached pids, API message
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* rings, list of clients; otherwise, various things
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* fail. (e.g. queue non-empty notification)
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*/
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/* ghosts keep the region from disappearing properly */
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svm_client_scan_this_region_nolock(vlib_rp);
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am->shmem_hdr->application_restarts++;
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q = am->shmem_hdr->vl_input_queue;
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am->shmem_hdr->vl_pid = getpid();
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q->consumer_pid = am->shmem_hdr->vl_pid;
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/* Drain the input queue, freeing msgs */
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for (i = 0; i < 10; i++) {
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if (pthread_mutex_trylock (&q->mutex) == 0) {
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pthread_mutex_unlock (&q->mutex);
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goto mutex_ok;
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}
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ts.tv_sec = 0;
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ts.tv_nsec = 10000*1000; /* 10 ms */
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while (nanosleep(&ts, &tsrem) < 0)
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ts = tsrem;
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}
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/* Mutex buggered, "fix" it */
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memset (&q->mutex, 0, sizeof (q->mutex));
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clib_warning ("forcibly release main input queue mutex");
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mutex_ok:
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am->vlib_rp = vlib_rp;
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while (unix_shared_memory_queue_sub (q,
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(u8 *)&old_msg,
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1 /* nowait */)
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!= -2 /* queue underflow */) {
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vl_msg_api_free_nolock ((void *)old_msg);
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am->shmem_hdr->restart_reclaims++;
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}
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pthread_mutex_unlock (&vlib_rp->mutex);
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root_rp = svm_get_root_rp();
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ASSERT(root_rp);
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/* Clean up the root region client list */
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pthread_mutex_lock (&root_rp->mutex);
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svm_client_scan_this_region_nolock (root_rp);
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pthread_mutex_unlock (&root_rp->mutex);
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} else {
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pthread_mutex_unlock (&vlib_rp->mutex);
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/*
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* Make sure the vlib app is really there...
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* Wait up to 100 seconds...
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*/
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for (i = 0; i < 10000; i++) {
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/* Yup, it's there, off we go... */
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if (kill (am->shmem_hdr->vl_pid, 0) >= 0)
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break;
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ts.tv_sec = 0;
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ts.tv_nsec = 10000*1000; /* 10 ms */
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while (nanosleep(&ts, &tsrem) < 0)
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ts = tsrem;
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}
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}
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am->vlib_rp = vlib_rp;
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vec_add1(am->mapped_shmem_regions, vlib_rp);
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return 0;
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}
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/* Clients simply have to wait... */
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if (!is_vlib) {
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pthread_mutex_unlock (&vlib_rp->mutex);
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/* Wait up to 100 seconds... */
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for (i = 0; i < 10000; i++) {
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ts.tv_sec = 0;
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ts.tv_nsec = 10000*1000; /* 10 ms */
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while (nanosleep(&ts, &tsrem) < 0)
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ts = tsrem;
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if (vlib_rp->user_ctx)
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goto ready;
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}
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/* Clean up and leave... */
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svm_region_unmap (vlib_rp);
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clib_warning ("region init fail");
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return (-2);
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ready:
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am->shmem_hdr = (void *)vlib_rp->user_ctx;
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am->our_pid = getpid();
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am->vlib_rp = vlib_rp;
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vec_add1(am->mapped_shmem_regions, vlib_rp);
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return 0;
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}
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/* Nope, it's our problem... */
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oldheap = svm_push_data_heap (vlib_rp);
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vec_validate(shmem_hdr, 0);
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shmem_hdr->version = VL_SHM_VERSION;
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/* vlib main input queue */
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shmem_hdr->vl_input_queue =
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unix_shared_memory_queue_init (1024, sizeof (uword), getpid(),
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am->vlib_signal);
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/* Set up the msg ring allocator */
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#define _(sz,n) \
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do { \
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ring_alloc_t _rp; \
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_rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
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_rp.size = (sz); \
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_rp.nitems = n; \
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_rp.hits = 0; \
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_rp.misses = 0; \
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vec_add1(shmem_hdr->vl_rings, _rp); \
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} while (0);
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foreach_vl_aring_size;
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#undef _
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#define _(sz,n) \
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do { \
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ring_alloc_t _rp; \
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_rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
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_rp.size = (sz); \
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_rp.nitems = n; \
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_rp.hits = 0; \
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_rp.misses = 0; \
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vec_add1(shmem_hdr->client_rings, _rp); \
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} while (0);
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foreach_clnt_aring_size;
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#undef _
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am->shmem_hdr = shmem_hdr;
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am->vlib_rp = vlib_rp;
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am->our_pid = getpid();
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if (is_vlib)
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am->shmem_hdr->vl_pid = am->our_pid;
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svm_pop_heap (oldheap);
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/*
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* After absolutely everything that a client might see is set up,
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* declare the shmem region valid
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*/
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vlib_rp->user_ctx = shmem_hdr;
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pthread_mutex_unlock (&vlib_rp->mutex);
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vec_add1(am->mapped_shmem_regions, vlib_rp);
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return 0;
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}
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void vl_register_mapped_shmem_region(svm_region_t *rp)
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{
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api_main_t *am = &api_main;
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vec_add1(am->mapped_shmem_regions, rp);
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}
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void vl_unmap_shmem (void)
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{
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svm_region_t *rp;
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int i;
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api_main_t *am = &api_main;
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if (! svm_get_root_rp())
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return;
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for (i = 0; i < vec_len(am->mapped_shmem_regions); i++) {
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rp = am->mapped_shmem_regions[i];
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svm_region_unmap (rp);
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}
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vec_free(am->mapped_shmem_regions);
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am->shmem_hdr = 0;
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svm_region_exit ();
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/* $$$ more careful cleanup, valgrind run... */
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vec_free (am->msg_handlers);
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vec_free (am->msg_endian_handlers);
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vec_free (am->msg_print_handlers);
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}
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void vl_msg_api_send_shmem (unix_shared_memory_queue_t *q, u8 *elem)
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{
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api_main_t *am = &api_main;
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uword *trace = (uword *)elem;
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if (am->tx_trace && am->tx_trace->enabled)
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vl_msg_api_trace(am, am->tx_trace, (void *)trace[0]);
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(void)unix_shared_memory_queue_add(q, elem, 0 /* nowait */);
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}
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void vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t *q, u8 *elem)
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{
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api_main_t *am = &api_main;
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uword *trace = (uword *)elem;
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if (am->tx_trace && am->tx_trace->enabled)
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vl_msg_api_trace(am, am->tx_trace, (void *)trace[0]);
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(void)unix_shared_memory_queue_add_nolock (q, elem);
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}
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static void vl_api_memclnt_create_reply_t_handler (
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vl_api_memclnt_create_reply_t *mp)
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{
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api_main_t *am = &api_main;
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int rv;
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am->my_client_index = mp->index;
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am->my_registration = (vl_api_registration_t *)(uword)
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mp->handle;
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rv = ntohl(mp->response);
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if (rv < 0)
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clib_warning ("WARNING: API mismatch detected");
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}
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void vl_client_add_api_signatures (vl_api_memclnt_create_t *mp)
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__attribute__((weak));
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void vl_client_add_api_signatures (vl_api_memclnt_create_t *mp)
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{
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int i;
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for (i = 0; i < ARRAY_LEN(mp->api_versions); i++)
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mp->api_versions[i] = 0;
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}
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int vl_client_connect (char *name, int ctx_quota, int input_queue_size)
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{
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svm_region_t *svm;
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vl_api_memclnt_create_t *mp;
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vl_api_memclnt_create_reply_t *rp;
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unix_shared_memory_queue_t *vl_input_queue;
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vl_shmem_hdr_t *shmem_hdr;
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int rv=0;
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void *oldheap;
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api_main_t *am = &api_main;
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if (am->my_registration) {
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clib_warning ("client %s already connected...", name);
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return -1;
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}
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if (am->vlib_rp == 0) {
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clib_warning ("am->vlib_rp NULL");
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return -1;
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}
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svm = am->vlib_rp;
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shmem_hdr = am->shmem_hdr;
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if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0) {
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clib_warning ("shmem_hdr / input queue NULL");
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return -1;
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}
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pthread_mutex_lock (&svm->mutex);
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oldheap = svm_push_data_heap(svm);
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vl_input_queue =
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unix_shared_memory_queue_init (input_queue_size, sizeof(uword),
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getpid(), 0);
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pthread_mutex_unlock(&svm->mutex);
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svm_pop_heap (oldheap);
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am->my_client_index = ~0;
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am->my_registration = 0;
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am->vl_input_queue = vl_input_queue;
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mp = vl_msg_api_alloc(sizeof(vl_api_memclnt_create_t));
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memset(mp, 0, sizeof (*mp));
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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_client_add_api_signatures(mp);
|
|
|
|
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;
|
|
|
|
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();
|
|
}
|