aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/nsim/node.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/plugins/nsim/node.c')
0 files changed, 0 insertions, 0 deletions
='n73' href='#n73'>73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 
/*
 * 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, char * chroot_prefix)
{
  int rv = 0;
  pneum_main_t *pm = &pneum_main;

  if (chroot_prefix != NULL)
    vl_set_memory_root_path (chroot_prefix);

  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);
}