X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fsvm%2Fssvm.c;h=505521981378f94c464b249ee8cf68053cb8781a;hb=b384b543313b6b47a277c903e9d4fcd4343054fa;hp=6f409eb68b628f08c08683bdb7a1f69141957c22;hpb=7cd468a3d7dee7d6c92f69a0bb7061ae208ec727;p=vpp.git

diff --git a/src/svm/ssvm.c b/src/svm/ssvm.c
index 6f409eb68b6..50552198137 100644
--- a/src/svm/ssvm.c
+++ b/src/svm/ssvm.c
@@ -12,37 +12,53 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "ssvm.h"
+#include <svm/ssvm.h>
+#include <svm/svm_common.h>
+
+typedef int (*init_fn) (ssvm_private_t *);
+typedef void (*delete_fn) (ssvm_private_t *);
+
+static init_fn master_init_fns[SSVM_N_SEGMENT_TYPES] =
+  { ssvm_master_init_shm, ssvm_master_init_memfd };
+static init_fn slave_init_fns[SSVM_N_SEGMENT_TYPES] =
+  { ssvm_slave_init_shm, ssvm_slave_init_memfd };
+static delete_fn delete_fns[SSVM_N_SEGMENT_TYPES] =
+  { ssvm_delete_shm, ssvm_delete_memfd };
 
 int
-ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
+ssvm_master_init_shm (ssvm_private_t * ssvm)
 {
-  int ssvm_fd;
-  u8 *ssvm_filename;
-  u8 junk = 0;
-  int flags;
+  int ssvm_fd, mh_flags = MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE;
+  svm_main_region_t *smr = svm_get_root_rp ()->data_base;
+  clib_mem_vm_map_t mapa = { 0 };
+  u8 junk = 0, *ssvm_filename;
   ssvm_shared_header_t *sh;
-  u64 ticks = clib_cpu_time_now ();
-  u64 randomize_baseva;
+  uword page_size;
   void *oldheap;
 
   if (ssvm->ssvm_size == 0)
     return SSVM_API_ERROR_NO_SIZE;
 
-  ssvm_filename = format (0, "/dev/shm/%s%c", ssvm->name, 0);
+  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");
@@ -57,43 +73,35 @@ ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
       return SSVM_API_ERROR_SET_SIZE;
     }
 
-  flags = MAP_SHARED;
-  if (ssvm->requested_va)
-    flags |= MAP_FIXED;
-
-  randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
-
+  page_size = clib_mem_vm_get_page_size (ssvm_fd);
   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);
+    clib_mem_vm_randomize_va (&ssvm->requested_va, min_log2 (page_size));
 
-  if (ssvm->sh == MAP_FAILED)
+  mapa.requested_va = ssvm->requested_va;
+  mapa.size = ssvm->ssvm_size;
+  mapa.fd = ssvm_fd;
+  if (clib_mem_vm_ext_map (&mapa))
     {
       clib_unix_warning ("mmap");
       close (ssvm_fd);
       return SSVM_API_ERROR_MMAP;
     }
-
   close (ssvm_fd);
 
-  ssvm->my_pid = getpid ();
+  sh = mapa.addr;
   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;
+  sh->type = SSVM_SEGMENT_SHM;
+  sh->heap = mheap_alloc_with_flags (((u8 *) sh) + page_size,
+				     ssvm->ssvm_size - page_size, mh_flags);
 
   oldheap = ssvm_push_heap (sh);
-  sh->name = format (0, "%s%c", ssvm->name, 0);
+  sh->name = format (0, "%s", ssvm->name, 0);
   ssvm_pop_heap (oldheap);
 
+  ssvm->sh = sh;
+  ssvm->my_pid = getpid ();
   ssvm->i_am_master = 1;
 
   /* The application has to set set sh->ready... */
@@ -101,15 +109,16 @@ ssvm_master_init (ssvm_private_t * ssvm, u32 master_index)
 }
 
 int
-ssvm_slave_init (ssvm_private_t * ssvm, int timeout_in_seconds)
+ssvm_slave_init_shm (ssvm_private_t * ssvm)
 {
   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)
+  while (ssvm->attach_timeout-- > 0)
     {
       if (ssvm_fd < 0)
 	ssvm_fd = shm_open ((char *) ssvm->name, O_RDWR, 0777);
@@ -140,7 +149,7 @@ map_it:
       return SSVM_API_ERROR_MMAP;
     }
 
-  while (timeout_in_seconds-- > 0)
+  while (ssvm->attach_timeout-- > 0)
     {
       if (sh->ready)
 	goto re_map_it;
@@ -169,6 +178,173 @@ re_map_it:
   return 0;
 }
 
+void
+ssvm_delete_shm (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);
+}
+
+/**
+ * Initialize memfd segment master
+ */
+int
+ssvm_master_init_memfd (ssvm_private_t * memfd)
+{
+  uword page_size, flags = MHEAP_FLAG_DISABLE_VM | MHEAP_FLAG_THREAD_SAFE;
+  ssvm_shared_header_t *sh;
+  void *oldheap;
+  clib_mem_vm_alloc_t alloc = { 0 };
+  clib_error_t *err;
+
+  if (memfd->ssvm_size == 0)
+    return SSVM_API_ERROR_NO_SIZE;
+
+  ASSERT (vec_c_string_is_terminated (memfd->name));
+
+  alloc.name = (char *) memfd->name;
+  alloc.size = memfd->ssvm_size;
+  alloc.flags = CLIB_MEM_VM_F_SHARED;
+  alloc.requested_va = memfd->requested_va;
+  if ((err = clib_mem_vm_ext_alloc (&alloc)))
+    {
+      clib_error_report (err);
+      return SSVM_API_ERROR_CREATE_FAILURE;
+    }
+
+  memfd->fd = alloc.fd;
+  memfd->sh = (ssvm_shared_header_t *) alloc.addr;
+  memfd->my_pid = getpid ();
+  memfd->i_am_master = 1;
+
+  page_size = 1 << alloc.log2_page_size;
+  sh = memfd->sh;
+  sh->master_pid = memfd->my_pid;
+  sh->ssvm_size = memfd->ssvm_size;
+  sh->ssvm_va = pointer_to_uword (sh);
+  sh->type = SSVM_SEGMENT_MEMFD;
+  sh->heap = mheap_alloc_with_flags (((u8 *) sh) + page_size,
+				     memfd->ssvm_size - page_size, flags);
+
+  oldheap = ssvm_push_heap (sh);
+  sh->name = format (0, "%s", memfd->name, 0);
+  ssvm_pop_heap (oldheap);
+
+  /* The application has to set set sh->ready... */
+  return 0;
+}
+
+/**
+ * Initialize memfd segment slave
+ *
+ * Subtly different than svm_slave_init. The caller needs to acquire
+ * a usable file descriptor for the memfd segment e.g. via
+ * vppinfra/socket.c:default_socket_recvmsg
+ */
+int
+ssvm_slave_init_memfd (ssvm_private_t * memfd)
+{
+  clib_mem_vm_map_t mapa = { 0 };
+  ssvm_shared_header_t *sh;
+  uword page_size;
+
+  memfd->i_am_master = 0;
+
+  page_size = clib_mem_vm_get_page_size (memfd->fd);
+  if (!page_size)
+    {
+      clib_unix_warning ("page size unknown");
+      return SSVM_API_ERROR_MMAP;
+    }
+
+  /*
+   * Map the segment once, to look at the shared header
+   */
+  mapa.fd = memfd->fd;
+  mapa.size = page_size;
+
+  if (clib_mem_vm_ext_map (&mapa))
+    {
+      clib_unix_warning ("slave research mmap (fd %d)", mapa.fd);
+      close (memfd->fd);
+      return SSVM_API_ERROR_MMAP;
+    }
+
+  sh = mapa.addr;
+  memfd->requested_va = sh->ssvm_va;
+  memfd->ssvm_size = sh->ssvm_size;
+  clib_mem_vm_free (sh, page_size);
+
+  /*
+   * Remap the segment at the 'right' address
+   */
+  mapa.requested_va = memfd->requested_va;
+  mapa.size = memfd->ssvm_size;
+  if (clib_mem_vm_ext_map (&mapa))
+    {
+      clib_unix_warning ("slave final mmap");
+      close (memfd->fd);
+      return SSVM_API_ERROR_MMAP;
+    }
+
+  sh = mapa.addr;
+  sh->slave_pid = getpid ();
+  memfd->sh = sh;
+  return 0;
+}
+
+void
+ssvm_delete_memfd (ssvm_private_t * memfd)
+{
+  vec_free (memfd->name);
+  clib_mem_vm_free (memfd->sh, memfd->ssvm_size);
+  close (memfd->fd);
+}
+
+int
+ssvm_master_init (ssvm_private_t * ssvm, ssvm_segment_type_t type)
+{
+  return (master_init_fns[type]) (ssvm);
+}
+
+int
+ssvm_slave_init (ssvm_private_t * ssvm, ssvm_segment_type_t type)
+{
+  return (slave_init_fns[type]) (ssvm);
+}
+
+void
+ssvm_delete (ssvm_private_t * ssvm)
+{
+  delete_fns[ssvm->sh->type] (ssvm);
+}
+
+ssvm_segment_type_t
+ssvm_type (const ssvm_private_t * ssvm)
+{
+  return ssvm->sh->type;
+}
+
+u8 *
+ssvm_name (const ssvm_private_t * ssvm)
+{
+  return ssvm->sh->name;
+}
+
 /*
  * fd.io coding-style-patch-verification: ON
  *