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/*
* 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"
int
ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
{
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;
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 (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;
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);
/* Throw away the backing file */
if (unlink ((char *) fn) < 0)
clib_unix_warning ("unlink segment '%s'", ssvm->name);
munmap ((void *) ssvm->requested_va, ssvm->ssvm_size);
vec_free (fn);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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