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/*
* Copyright (c) 2016 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include <setjmp.h>
#include <stdbool.h>
#include <vnet/vnet.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vpp-api/vpe_msg_enum.h>
#include "pneum.h"
#define vl_typedefs /* define message structures */
#include <vpp-api/vpe_all_api_h.h>
#undef vl_typedefs
#define vl_endianfun /* define message structures */
#include <vpp-api/vpe_all_api_h.h>
#undef vl_endianfun
typedef struct {
u8 rx_thread_jmpbuf_valid;
u8 connected_to_vlib;
jmp_buf rx_thread_jmpbuf;
pthread_t rx_thread_handle;
} pneum_main_t;
pneum_main_t pneum_main;
extern int wrap_pneum_callback(char *data, int len);
/*
* Satisfy external references when -lvlib is not available.
*/
void vlib_cli_output (struct vlib_main_t * vm, char * fmt, ...)
{
clib_warning ("vlib_cli_output called...");
}
#define vl_api_version(n,v) static u32 vpe_api_version = v;
#include <vpp-api/vpe.api.h>
#undef vl_api_version
void
vl_client_add_api_signatures (vl_api_memclnt_create_t *mp)
{
/*
* Send the main API signature in slot 0. This bit of code must
* match the checks in ../vpe/api/api.c: vl_msg_api_version_check().
*/
mp->api_versions[0] = clib_host_to_net_u32 (vpe_api_version);
}
static void
pneum_api_handler (void *msg)
{
u16 id = ntohs(*((u16 *)msg));
if (id == VL_API_RX_THREAD_EXIT) {
pneum_main_t *pm = &pneum_main;
vl_msg_api_free(msg);
longjmp(pm->rx_thread_jmpbuf, 1);
}
msgbuf_t *msgbuf = (msgbuf_t *)(((u8 *)msg) - offsetof(msgbuf_t, data));
int l = ntohl(msgbuf->data_len);
if (l == 0)
clib_warning("Message ID %d has wrong length: %d\n", id, l);
/* Call Python callback */
(void)wrap_pneum_callback(msg, l);
vl_msg_api_free(msg);
}
static void *
pneum_rx_thread_fn (void *arg)
{
unix_shared_memory_queue_t *q;
pneum_main_t *pm = &pneum_main;
api_main_t *am = &api_main;
uword msg;
q = am->vl_input_queue;
/* So we can make the rx thread terminate cleanly */
if (setjmp(pm->rx_thread_jmpbuf) == 0) {
pm->rx_thread_jmpbuf_valid = 1;
while (1)
while (!unix_shared_memory_queue_sub(q, (u8 *)&msg, 0))
pneum_api_handler((void *)msg);
}
pthread_exit(0);
}
int
pneum_connect (char *name)
{
int rv = 0;
pneum_main_t *pm = &pneum_main;
if ((rv = vl_client_api_map("/vpe-api"))) {
clib_warning ("vl_client_api map rv %d", rv);
return rv;
}
if (vl_client_connect(name, 0, 32) < 0) {
vl_client_api_unmap();
return (-1);
}
/* Start the rx queue thread */
rv = pthread_create(&pm->rx_thread_handle, NULL, pneum_rx_thread_fn, 0);
if (rv) {
clib_warning("pthread_create returned %d", rv);
vl_client_api_unmap();
return (-1);
}
pm->connected_to_vlib = 1;
return (0);
}
int
pneum_disconnect (void)
{
api_main_t *am = &api_main;
pneum_main_t *pm = &pneum_main;
if (pm->rx_thread_jmpbuf_valid) {
vl_api_rx_thread_exit_t *ep;
uword junk;
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(pm->rx_thread_handle, (void **) &junk);
}
if (pm->connected_to_vlib) {
vl_client_disconnect();
vl_client_api_unmap();
}
memset (pm, 0, sizeof (*pm));
return (0);
}
int
pneum_read (char **p, int *l)
{
unix_shared_memory_queue_t *q;
api_main_t *am = &api_main;
uword msg;
*l = 0;
if (am->our_pid == 0) return (-1);
q = am->vl_input_queue;
int rv = unix_shared_memory_queue_sub(q, (u8 *)&msg, 0);
if (rv == 0) {
u16 msg_id = ntohs(*((u16 *)msg));
msgbuf_t *msgbuf = (msgbuf_t *)(((u8 *)msg) - offsetof(msgbuf_t, data));
*l = ntohl(msgbuf->data_len);
if (*l == 0) {
printf("Unregistered API message: %d\n", msg_id);
return (-1);
}
*p = (char *)msg;
} else {
printf("Read failed with %d\n", rv);
}
return (rv);
}
/*
* XXX: Makes the assumption that client_index is the first member
*/
typedef VL_API_PACKED(struct _vl_api_header {
u16 _vl_msg_id;
u32 client_index;
}) vl_api_header_t;
static unsigned int
pneum_client_index (void)
{
return (api_main.my_client_index);
}
int
pneum_write (char *p, int l)
{
int rv = -1;
api_main_t *am = &api_main;
vl_api_header_t *mp = vl_msg_api_alloc(l);
unix_shared_memory_queue_t *q;
if (!mp) return (-1);
memcpy(mp, p, l);
mp->client_index = pneum_client_index();
q = am->shmem_hdr->vl_input_queue;
rv = unix_shared_memory_queue_add(q, (u8 *)&mp, 0);
if (rv != 0) {
printf("vpe_api_write fails: %d\n", rv);
/* Clear message */
vl_msg_api_free(mp);
}
return (rv);
}
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