2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 int ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
23 ssvm_shared_header_t * sh;
24 u64 ticks = clib_cpu_time_now();
28 if (ssvm->ssvm_size == 0)
29 return SSVM_API_ERROR_NO_SIZE;
31 ssvm_filename = format (0, "/dev/shm/%s%c", ssvm->name, 0);
33 unlink ((char *) ssvm_filename);
35 vec_free(ssvm_filename);
37 ssvm_fd = shm_open((char *) ssvm->name, O_RDWR | O_CREAT | O_EXCL, 0777);
41 clib_unix_warning ("create segment '%s'", ssvm->name);
42 return SSVM_API_ERROR_CREATE_FAILURE;
45 lseek(ssvm_fd, ssvm->ssvm_size, SEEK_SET);
46 if (write(ssvm_fd, &junk, 1) != 1)
48 clib_unix_warning ("set ssvm size");
50 return SSVM_API_ERROR_SET_SIZE;
54 if (ssvm->requested_va)
57 randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
59 if (ssvm->requested_va)
60 ssvm->requested_va += randomize_baseva;
62 sh = ssvm->sh = (void *) mmap((void *)ssvm->requested_va, ssvm->ssvm_size,
63 PROT_READ | PROT_WRITE, flags, ssvm_fd, 0);
65 if ((u64) ssvm->sh == (u64) MAP_FAILED)
67 clib_unix_warning ("mmap");
69 return SSVM_API_ERROR_MMAP;
74 ssvm->my_pid = getpid();
75 sh->master_pid = ssvm->my_pid;
76 sh->ssvm_size = ssvm->ssvm_size;
77 sh->heap = mheap_alloc_with_flags
78 (((u8 *)sh) + MMAP_PAGESIZE, ssvm->ssvm_size - MMAP_PAGESIZE,
79 MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE);
81 sh->ssvm_va = (u64) sh;
82 sh->master_index = master_index;
84 oldheap = ssvm_push_heap (sh);
85 sh->name = format (0, "%s%c", ssvm->name, 0);
86 ssvm_pop_heap (oldheap);
88 ssvm->i_am_master = 1;
90 /* The application has to set set sh->ready... */
94 int ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
98 ssvm_shared_header_t * sh;
100 ssvm->i_am_master = 0;
102 while (timeout_in_seconds-- > 0)
105 ssvm_fd = shm_open((char *)ssvm->name, O_RDWR, 0777);
111 if (fstat(ssvm_fd, &stat) < 0)
117 if (stat.st_size > 0)
120 clib_warning ("slave timeout");
121 return SSVM_API_ERROR_SLAVE_TIMEOUT;
124 sh = (void *) mmap (0, MMAP_PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
126 if ((u64) sh == (u64) MAP_FAILED)
128 clib_unix_warning ("slave research mmap");
130 return SSVM_API_ERROR_MMAP;
133 while (timeout_in_seconds-- > 0)
139 munmap (sh, MMAP_PAGESIZE);
140 clib_warning ("slave timeout 2");
141 return SSVM_API_ERROR_SLAVE_TIMEOUT;
144 ssvm->requested_va = (u64) sh->ssvm_va;
145 ssvm->ssvm_size = sh->ssvm_size;
146 munmap (sh, MMAP_PAGESIZE);
148 sh = ssvm->sh = (void *) mmap((void *)ssvm->requested_va, ssvm->ssvm_size,
149 PROT_READ | PROT_WRITE,
150 MAP_SHARED | MAP_FIXED,
153 if ((u64) sh == (u64) MAP_FAILED)
155 clib_unix_warning ("slave final mmap");
157 return SSVM_API_ERROR_MMAP;
159 sh->slave_pid = getpid();