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/*
*------------------------------------------------------------------
* memory_client.c - API message handling, client code.
*
* Copyright (c) 2010 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 <setjmp.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/bitmap.h>
#include <vppinfra/fifo.h>
#include <vppinfra/time.h>
#include <vppinfra/mheap.h>
#include <vppinfra/heap.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlibmemory/api.h>
#include <vlibmemory/vl_memory_msg_enum.h>
#define vl_typedefs /* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs
#define vl_endianfun /* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun
/* instantiate all the print functions we know about */
#define vl_print(handle, ...) clib_warning (__VA_ARGS__)
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun
typedef struct {
u8 rx_thread_jmpbuf_valid;
u8 connected_to_vlib;
jmp_buf rx_thread_jmpbuf;
pthread_t rx_thread_handle;
/* Plugin message base lookup scheme */
volatile u8 first_msg_id_reply_ready;
u16 first_msg_id_reply;
} memory_client_main_t;
memory_client_main_t memory_client_main;
static void *rx_thread_fn(void *arg)
{
unix_shared_memory_queue_t *q;
memory_client_main_t *mm = &memory_client_main;
api_main_t *am = &api_main;
q = am->vl_input_queue;
/* So we can make the rx thread terminate cleanly */
if (setjmp(mm->rx_thread_jmpbuf) == 0) {
mm->rx_thread_jmpbuf_valid = 1;
while (1) {
vl_msg_api_queue_handler (q);
}
}
pthread_exit(0);
}
static void vl_api_rx_thread_exit_t_handler (
vl_api_rx_thread_exit_t *mp)
{
memory_client_main_t *mm = &memory_client_main;
vl_msg_api_free (mp);
longjmp (mm->rx_thread_jmpbuf, 1);
}
static void noop_handler (void *notused)
{
}
#define foreach_api_msg \
_(RX_THREAD_EXIT, rx_thread_exit)
static int connect_to_vlib_internal (char *svm_name, char *client_name,
int rx_queue_size, int want_pthread)
{
int rv=0;
memory_client_main_t *mm = &memory_client_main;
if ((rv = vl_client_api_map(svm_name))) {
clib_warning ("vl_client_api map rv %d", rv);
return rv;
}
#define _(N,n) \
vl_msg_api_set_handlers(VL_API_##N, #n, \
vl_api_##n##_t_handler, \
noop_handler, \
vl_api_##n##_t_endian, \
vl_api_##n##_t_print, \
sizeof(vl_api_##n##_t), 1);
foreach_api_msg;
#undef _
if (vl_client_connect(client_name, 0 /* punt quota */,
rx_queue_size /* input queue */) < 0) {
vl_client_api_unmap();
return -1;
}
/* Start the rx queue thread */
if (want_pthread) {
rv = pthread_create(&mm->rx_thread_handle,
NULL /*attr*/, rx_thread_fn, 0);
if (rv)
clib_warning("pthread_create returned %d", rv);
}
mm->connected_to_vlib = 1;
return 0;
}
int vl_client_connect_to_vlib(char *svm_name, char *client_name,
int rx_queue_size)
{
return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
1 /* want pthread */);
}
int vl_client_connect_to_vlib_no_rx_pthread (char *svm_name, char *client_name,
int rx_queue_size)
{
return connect_to_vlib_internal (svm_name, client_name, rx_queue_size,
0 /* want pthread */);
}
void vl_client_disconnect_from_vlib (void)
{
memory_client_main_t *mm = &memory_client_main;
api_main_t *am = &api_main;
uword junk;
if (mm->rx_thread_jmpbuf_valid) {
vl_api_rx_thread_exit_t *ep;
ep = vl_msg_api_alloc (sizeof (*ep));
ep->_vl_msg_id = ntohs(VL_API_RX_THREAD_EXIT);
vl_msg_api_send_shmem (am->vl_input_queue, (u8 *)&ep);
pthread_join (mm->rx_thread_handle, (void **) &junk);
}
if (mm->connected_to_vlib) {
vl_client_disconnect();
vl_client_api_unmap();
}
memset (mm, 0, sizeof (*mm));
}
static void vl_api_get_first_msg_id_reply_t_handler
(vl_api_get_first_msg_id_reply_t * mp)
{
memory_client_main_t *mm = &memory_client_main;
i32 retval = ntohl(mp->retval);
mm->first_msg_id_reply = (retval >= 0) ? ntohs(mp->first_msg_id) : ~0;
mm->first_msg_id_reply_ready = 1;
}
u16 vl_client_get_first_plugin_msg_id (char * plugin_name)
{
vl_api_get_first_msg_id_t * mp;
api_main_t * am = &api_main;
memory_client_main_t * mm = &memory_client_main;
f64 timeout;
void * old_handler;
clib_time_t clib_time;
u16 rv = ~0;
if (strlen(plugin_name) + 1 > sizeof (mp->name))
return (rv);
memset (&clib_time, 0, sizeof (clib_time));
clib_time_init (&clib_time);
/* Push this plugin's first_msg_id_reply handler */
old_handler = am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY];
am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = (void *)
vl_api_get_first_msg_id_reply_t_handler;
/* Ask the data-plane for the message-ID base of the indicated plugin */
mm->first_msg_id_reply_ready = 0;
mp = vl_msg_api_alloc (sizeof(*mp));
memset (mp, 0, sizeof (*mp));
mp->_vl_msg_id = ntohs(VL_API_GET_FIRST_MSG_ID);
mp->client_index = am->my_client_index;
strncpy ((char *) mp->name, plugin_name, sizeof (mp->name) - 1);
vl_msg_api_send_shmem (am->shmem_hdr->vl_input_queue, (u8 *)&mp);
/* Synchronously wait for the answer */
do {
timeout = clib_time_now (&clib_time) + 1.0;
while (clib_time_now (&clib_time) < timeout) {
if (mm->first_msg_id_reply_ready == 1) {
rv = mm->first_msg_id_reply;
goto result;
}
}
/* Restore old handler */
am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;
return rv;
} while(0);
result:
/* Restore the old handler */
am->msg_handlers[VL_API_GET_FIRST_MSG_ID_REPLY] = old_handler;
if (rv == (u16) ~0)
clib_warning ("plugin '%s' not registered", plugin_name);
return rv;
}
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