aboutsummaryrefslogtreecommitdiffstats
path: root/src/vat/restart.c
diff options
context:
space:
mode:
authorFilip Tehlar <ftehlar@cisco.com>2017-06-05 13:40:13 +0200
committerFlorin Coras <florin.coras@gmail.com>2017-06-05 15:31:07 +0000
commit560274d042d12f31aceabff6a293cdf71429552d (patch)
treeb46615b680e84138b908d7765029a0b13e6f5d8e /src/vat/restart.c
parent719aef4835403125284a4fa71093e8b536997841 (diff)
LISP-GPE: return index of newly created fwd entry, VPP-868
Change-Id: I4fc45097cb994ab6a59503d9fcfb693d1c7ec442 Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
Diffstat (limited to 'src/vat/restart.c')
0 files changed, 0 insertions, 0 deletions
'#n142'>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 
/*
 * Copyright (c) 2015 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 "ssvm.h"
#include "svm_common.h"

int
ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
{
  svm_main_region_t *smr = svm_get_root_rp ()->data_base;
  int ssvm_fd;
  u8 *ssvm_filename;
  u8 junk = 0;
  int flags;
  ssvm_shared_header_t *sh;
  u64 ticks = clib_cpu_time_now ();
  u64 randomize_baseva;
  void *oldheap;

  if (ssvm->ssvm_size == 0)
    return SSVM_API_ERROR_NO_SIZE;

  if (CLIB_DEBUG > 1)
    clib_warning ("[%d] creating segment '%s'", getpid (), ssvm->name);

  ASSERT (vec_c_string_is_terminated (ssvm->name));
  ssvm_filename = format (0, "/dev/shm/%s%c", ssvm->name, 0);

  unlink ((char *) ssvm_filename);

  vec_free (ssvm_filename);

  ssvm_fd = shm_open ((char *) ssvm->name, O_RDWR | O_CREAT | O_EXCL, 0777);

  if (ssvm_fd < 0)
    {
      clib_unix_warning ("create segment '%s'", ssvm->name);
      return SSVM_API_ERROR_CREATE_FAILURE;
    }

  if (fchmod (ssvm_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) < 0)
    clib_unix_warning ("ssvm segment chmod");
  if (fchown (ssvm_fd, smr->uid, smr->gid) < 0)
    clib_unix_warning ("ssvm segment chown");

  if (lseek (ssvm_fd, ssvm->ssvm_size, SEEK_SET) < 0)
    {
      clib_unix_warning ("lseek");
      close (ssvm_fd);
      return SSVM_API_ERROR_SET_SIZE;
    }

  if (write (ssvm_fd, &junk, 1) != 1)
    {
      clib_unix_warning ("set ssvm size");
      close (ssvm_fd);
      return SSVM_API_ERROR_SET_SIZE;
    }

  flags = MAP_SHARED;
  if (ssvm->requested_va)
    flags |= MAP_FIXED;

  randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;

  if (ssvm->requested_va)
    ssvm->requested_va += randomize_baseva;

  sh = ssvm->sh =
    (ssvm_shared_header_t *) mmap ((void *) ssvm->requested_va,
				   ssvm->ssvm_size, PROT_READ | PROT_WRITE,
				   flags, ssvm_fd, 0);

  if (ssvm->sh == MAP_FAILED)
    {
      clib_unix_warning ("mmap");
      close (ssvm_fd);
      return SSVM_API_ERROR_MMAP;
    }

  close (ssvm_fd);

  ssvm->my_pid = getpid ();
  sh->master_pid = ssvm->my_pid;
  sh->ssvm_size = ssvm->ssvm_size;
  sh->heap = mheap_alloc_with_flags
    (((u8 *) sh) + MMAP_PAGESIZE, ssvm->ssvm_size - MMAP_PAGESIZE,
     MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE);

  sh->ssvm_va = pointer_to_uword (sh);
  sh->master_index = master_index;

  oldheap = ssvm_push_heap (sh);
  sh->name = format (0, "%s%c", ssvm->name, 0);
  ssvm_pop_heap (oldheap);

  ssvm->i_am_master = 1;

  /* The application has to set set sh->ready... */
  return 0;
}

int
ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
{
  struct stat stat;
  int ssvm_fd = -1;
  ssvm_shared_header_t *sh;

  ASSERT (vec_c_string_is_terminated (ssvm->name));
  ssvm->i_am_master = 0;

  while (timeout_in_seconds-- > 0)
    {
      if (ssvm_fd < 0)
	ssvm_fd = shm_open ((char *) ssvm->name, O_RDWR, 0777);
      if (ssvm_fd < 0)
	{
	  sleep (1);
	  continue;
	}
      if (fstat (ssvm_fd, &stat) < 0)
	{
	  sleep (1);
	  continue;
	}

      if (stat.st_size > 0)
	goto map_it;
    }
  clib_warning ("slave timeout");
  return SSVM_API_ERROR_SLAVE_TIMEOUT;

map_it:
  sh = (void *) mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
		      ssvm_fd, 0);
  if (sh == MAP_FAILED)
    {
      clib_unix_warning ("slave research mmap");
      close (ssvm_fd);
      return SSVM_API_ERROR_MMAP;
    }

  while (timeout_in_seconds-- > 0)
    {
      if (sh->ready)
	goto re_map_it;
    }
  close (ssvm_fd);
  munmap (sh, MMAP_PAGESIZE);
  clib_warning ("slave timeout 2");
  return SSVM_API_ERROR_SLAVE_TIMEOUT;

re_map_it:
  ssvm->requested_va = (u64) sh->ssvm_va;
  ssvm->ssvm_size = sh->ssvm_size;
  munmap (sh, MMAP_PAGESIZE);

  sh = ssvm->sh = (void *) mmap ((void *) ssvm->requested_va, ssvm->ssvm_size,
				 PROT_READ | PROT_WRITE,
				 MAP_SHARED | MAP_FIXED, ssvm_fd, 0);

  if (sh == MAP_FAILED)
    {
      clib_unix_warning ("slave final mmap");
      close (ssvm_fd);
      return SSVM_API_ERROR_MMAP;
    }
  sh->slave_pid = getpid ();
  return 0;
}

void
ssvm_delete (ssvm_private_t * ssvm)
{
  u8 *fn;

  fn = format (0, "/dev/shm/%s%c", ssvm->name, 0);

  if (CLIB_DEBUG > 1)
    clib_warning ("[%d] unlinking ssvm (%s) backing file '%s'", getpid (),
		  ssvm->name, fn);

  /* Throw away the backing file */
  if (unlink ((char *) fn) < 0)
    clib_unix_warning ("unlink segment '%s'", ssvm->name);

  vec_free (fn);
  vec_free (ssvm->name);

  munmap ((void *) ssvm->requested_va, ssvm->ssvm_size);
}


/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */