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-rw-r--r--vpp/svm/ssvm.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/vpp/svm/ssvm.c b/vpp/svm/ssvm.c
new file mode 100644
index 00000000..6f409eb6
--- /dev/null
+++ b/vpp/svm/ssvm.c
@@ -0,0 +1,178 @@
+/*
+ * 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;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */