X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fsvm%2Fsvm_fifo_segment.c;h=c80374a7ffe7acd2d02da55cd9d171b78273e4bc;hb=d756b35032cdf7fdaaf0d6611388a54d32d72e92;hp=acabb3bd95cec168334b52fb452481a7bc0f6b7f;hpb=68b0fb0c620c7451ef1a6380c43c39de6614db51;p=vpp.git

diff --git a/src/svm/svm_fifo_segment.c b/src/svm/svm_fifo_segment.c
index acabb3bd95c..c80374a7ffe 100644
--- a/src/svm/svm_fifo_segment.c
+++ b/src/svm/svm_fifo_segment.c
@@ -17,6 +17,76 @@
 
 svm_fifo_segment_main_t svm_fifo_segment_main;
 
+static void
+preallocate_fifo_pairs (svm_fifo_segment_header_t * fsh,
+			svm_fifo_segment_create_args_t * a)
+{
+  u32 rx_fifo_size, tx_fifo_size;
+  svm_fifo_t *f;
+  u8 *rx_fifo_space, *tx_fifo_space;
+  int i;
+
+  /* Parameter check */
+  if (a->rx_fifo_size == 0 || a->tx_fifo_size == 0
+      || a->preallocated_fifo_pairs == 0)
+    return;
+
+  /* Calculate space requirements */
+  rx_fifo_size = (sizeof (*f) + a->rx_fifo_size) * a->preallocated_fifo_pairs;
+  tx_fifo_size = (sizeof (*f) + a->tx_fifo_size) * a->preallocated_fifo_pairs;
+
+  if (0)
+    clib_warning ("rx_fifo_size %u (%d mb), tx_fifo_size %u (%d mb)",
+		  rx_fifo_size, rx_fifo_size >> 20,
+		  tx_fifo_size, tx_fifo_size >> 20);
+
+  /* Allocate rx fifo space. May fail. */
+  rx_fifo_space = clib_mem_alloc_aligned_at_offset
+    (rx_fifo_size, CLIB_CACHE_LINE_BYTES, 0 /* align_offset */ ,
+     0 /* os_out_of_memory */ );
+
+  /* Same for TX */
+  tx_fifo_space = clib_mem_alloc_aligned_at_offset
+    (tx_fifo_size, CLIB_CACHE_LINE_BYTES, 0 /* align_offset */ ,
+     0 /* os_out_of_memory */ );
+
+  /* Make sure it worked. Clean up if it didn't... */
+  if (rx_fifo_space == 0 || tx_fifo_space == 0)
+    {
+      if (rx_fifo_space)
+	clib_mem_free (rx_fifo_space);
+      else
+	clib_warning ("rx fifo preallocation failure: size %d npairs %d",
+		      a->rx_fifo_size, a->preallocated_fifo_pairs);
+
+      if (tx_fifo_space)
+	clib_mem_free (tx_fifo_space);
+      else
+	clib_warning ("tx fifo preallocation failure: size %d nfifos %d",
+		      a->tx_fifo_size, a->preallocated_fifo_pairs);
+      return;
+    }
+
+  /* Carve rx fifo space */
+  f = (svm_fifo_t *) rx_fifo_space;
+  for (i = 0; i < a->preallocated_fifo_pairs; i++)
+    {
+      f->next = fsh->free_fifos[FIFO_SEGMENT_RX_FREELIST];
+      fsh->free_fifos[FIFO_SEGMENT_RX_FREELIST] = f;
+      rx_fifo_space += sizeof (*f) + a->rx_fifo_size;
+      f = (svm_fifo_t *) rx_fifo_space;
+    }
+  /* Carve tx fifo space */
+  f = (svm_fifo_t *) tx_fifo_space;
+  for (i = 0; i < a->preallocated_fifo_pairs; i++)
+    {
+      f->next = fsh->free_fifos[FIFO_SEGMENT_TX_FREELIST];
+      fsh->free_fifos[FIFO_SEGMENT_TX_FREELIST] = f;
+      tx_fifo_space += sizeof (*f) + a->tx_fifo_size;
+      f = (svm_fifo_t *) tx_fifo_space;
+    }
+}
+
 /** (master) create an svm fifo segment */
 int
 svm_fifo_segment_create (svm_fifo_segment_create_args_t * a)
@@ -35,7 +105,7 @@ svm_fifo_segment_create (svm_fifo_segment_create_args_t * a)
   s->ssvm.ssvm_size = a->segment_size;
   s->ssvm.i_am_master = 1;
   s->ssvm.my_pid = getpid ();
-  s->ssvm.name = (u8 *) a->segment_name;
+  s->ssvm.name = format (0, "%s", a->segment_name);
   s->ssvm.requested_va = sm->next_baseva;
 
   rv = ssvm_master_init (&s->ssvm, s - sm->segments);
@@ -59,14 +129,98 @@ svm_fifo_segment_create (svm_fifo_segment_create_args_t * a)
   s->h = fsh;
   fsh->segment_name = format (0, "%s%c", a->segment_name, 0);
 
-  /* Avoid vec_add1(...) failure when adding a fifo, etc. */
-  vec_validate (fsh->fifos, 64);
-  _vec_len (fsh->fifos) = 0;
+  preallocate_fifo_pairs (fsh, a);
 
   ssvm_pop_heap (oldheap);
 
   sh->ready = 1;
-  a->new_segment_index = s - sm->segments;
+  vec_add1 (a->new_segment_indices, s - sm->segments);
+  return (0);
+}
+
+/** Create an svm fifo segment in process-private memory */
+int
+svm_fifo_segment_create_process_private (svm_fifo_segment_create_args_t * a)
+{
+  svm_fifo_segment_private_t *s;
+  svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
+  ssvm_shared_header_t *sh;
+  svm_fifo_segment_header_t *fsh;
+  void *oldheap;
+  u8 **heaps = 0;
+  mheap_t *heap_header;
+  int segment_count = 1;
+  int i;
+
+  if (a->private_segment_count && a->private_segment_size)
+    {
+      void *mem;
+      u8 *heap;
+      u32 pagesize = clib_mem_get_page_size ();
+      u32 rnd_size;
+
+      for (i = 0; i < a->private_segment_count; i++)
+	{
+	  rnd_size = (a->private_segment_size + (pagesize - 1)) & ~pagesize;
+
+	  mem = mmap (0, rnd_size, PROT_READ | PROT_WRITE,
+		      MAP_PRIVATE | MAP_ANONYMOUS,
+		      -1 /* fd */ , 0 /* offset */ );
+
+	  if (mem == MAP_FAILED)
+	    {
+	      clib_unix_warning ("mmap");
+	      return -1;
+	    }
+	  heap = mheap_alloc (mem, rnd_size);
+	  heap_header = mheap_header (heap);
+	  heap_header->flags |= MHEAP_FLAG_THREAD_SAFE;
+	  vec_add1 (heaps, heap);
+	}
+      segment_count = a->private_segment_count;
+    }
+
+  /* Spread preallocated fifo pairs across segments */
+  a->preallocated_fifo_pairs /= segment_count;
+
+  /* Allocate segments */
+  for (i = 0; i < segment_count; i++)
+    {
+      pool_get (sm->segments, s);
+      memset (s, 0, sizeof (*s));
+
+      s->ssvm.ssvm_size = ~0;
+      s->ssvm.i_am_master = 1;
+      s->ssvm.my_pid = getpid ();
+      s->ssvm.name = (u8 *) a->segment_name;
+      s->ssvm.requested_va = ~0;
+
+      /* Allocate a [sic] shared memory header, in process memory... */
+      sh = clib_mem_alloc_aligned (sizeof (*sh), CLIB_CACHE_LINE_BYTES);
+      s->ssvm.sh = sh;
+
+      memset (sh, 0, sizeof (*sh));
+      sh->heap = a->private_segment_count ? heaps[i] : clib_mem_get_heap ();
+
+      /* Set up svm_fifo_segment shared header */
+      fsh = clib_mem_alloc (sizeof (*fsh));
+      memset (fsh, 0, sizeof (*fsh));
+      sh->opaque[0] = fsh;
+      s->h = fsh;
+      fsh->segment_name = format (0, "%s%c", a->segment_name, 0);
+
+      if (a->private_segment_count)
+	{
+	  oldheap = clib_mem_get_heap ();
+	  clib_mem_set_heap (sh->heap);
+	  preallocate_fifo_pairs (fsh, a);
+	  clib_mem_set_heap (oldheap);
+	}
+
+      sh->ready = 1;
+      vec_add1 (a->new_segment_indices, s - sm->segments);
+    }
+  vec_free (heaps);
   return (0);
 }
 
@@ -82,7 +236,6 @@ svm_fifo_segment_attach (svm_fifo_segment_create_args_t * a)
 
   /* Allocate a fresh segment */
   pool_get (sm->segments, s);
-
   memset (s, 0, sizeof (*s));
 
   s->ssvm.ssvm_size = a->segment_size;
@@ -103,7 +256,7 @@ svm_fifo_segment_attach (svm_fifo_segment_create_args_t * a)
   fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
   s->h = fsh;
 
-  a->new_segment_index = s - sm->segments;
+  vec_add1 (a->new_segment_indices, s - sm->segments);
   return (0);
 }
 
@@ -117,7 +270,8 @@ svm_fifo_segment_delete (svm_fifo_segment_private_t * s)
 
 svm_fifo_t *
 svm_fifo_segment_alloc_fifo (svm_fifo_segment_private_t * s,
-			     u32 data_size_in_bytes)
+			     u32 data_size_in_bytes,
+			     svm_fifo_segment_freelist_t list_index)
 {
   ssvm_shared_header_t *sh;
   svm_fifo_segment_header_t *fsh;
@@ -126,47 +280,104 @@ svm_fifo_segment_alloc_fifo (svm_fifo_segment_private_t * s,
 
   sh = s->ssvm.sh;
   fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
+
+  ssvm_lock_non_recursive (sh, 1);
   oldheap = ssvm_push_heap (sh);
 
+  switch (list_index)
+    {
+    case FIFO_SEGMENT_RX_FREELIST:
+    case FIFO_SEGMENT_TX_FREELIST:
+      f = fsh->free_fifos[list_index];
+      if (f)
+	{
+	  fsh->free_fifos[list_index] = f->next;
+	  /* (re)initialize the fifo, as in svm_fifo_create */
+	  memset (f, 0, sizeof (*f));
+	  f->nitems = data_size_in_bytes;
+	  f->ooos_list_head = OOO_SEGMENT_INVALID_INDEX;
+	  goto found;
+	}
+      /* FALLTHROUGH */
+    case FIFO_SEGMENT_FREELIST_NONE:
+      break;
+
+    default:
+      clib_warning ("ignore bogus freelist %d", list_index);
+      break;
+    }
+
   /* Note: this can fail, in which case: create another segment */
   f = svm_fifo_create (data_size_in_bytes);
-  if (f == 0)
+  if (PREDICT_FALSE (f == 0))
     {
       ssvm_pop_heap (oldheap);
+      ssvm_unlock_non_recursive (sh);
       return (0);
     }
 
-  vec_add1 (fsh->fifos, f);
+found:
+  /* If rx_freelist add to active fifos list. When cleaning up segment,
+   * we need a list of active sessions that should be disconnected. Since
+   * both rx and tx fifos keep pointers to the session, it's enough to track
+   * only one. */
+  if (list_index == FIFO_SEGMENT_RX_FREELIST)
+    {
+      if (fsh->fifos)
+	{
+	  fsh->fifos->prev = f;
+	  f->next = fsh->fifos;
+	}
+      fsh->fifos = f;
+    }
 
   ssvm_pop_heap (oldheap);
+  ssvm_unlock_non_recursive (sh);
   return (f);
 }
 
 void
-svm_fifo_segment_free_fifo (svm_fifo_segment_private_t * s, svm_fifo_t * f)
+svm_fifo_segment_free_fifo (svm_fifo_segment_private_t * s, svm_fifo_t * f,
+			    svm_fifo_segment_freelist_t list_index)
 {
   ssvm_shared_header_t *sh;
   svm_fifo_segment_header_t *fsh;
   void *oldheap;
-  int i;
+
 
   sh = s->ssvm.sh;
   fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
+
+  ssvm_lock_non_recursive (sh, 2);
   oldheap = ssvm_push_heap (sh);
 
-  for (i = 0; i < vec_len (fsh->fifos); i++)
+  switch (list_index)
     {
-      if (fsh->fifos[i] == f)
-	{
-	  vec_delete (fsh->fifos, 1, i);
-	  goto found;
-	}
+    case FIFO_SEGMENT_RX_FREELIST:
+      /* Remove from active list */
+      if (f->prev)
+	f->prev->next = f->next;
+      else
+	fsh->fifos = f->next;
+      if (f->next)
+	f->next->prev = f->prev;
+      /* Fall through: we add only rx fifos to active pool */
+    case FIFO_SEGMENT_TX_FREELIST:
+      /* Add to free list */
+      f->next = fsh->free_fifos[list_index];
+      f->prev = 0;
+      fsh->free_fifos[list_index] = f;
+      break;
+    case FIFO_SEGMENT_FREELIST_NONE:
+      break;
+
+    default:
+      clib_warning ("ignore bogus freelist %d", list_index);
+      break;
     }
-  clib_warning ("fifo 0x%llx not found in fifo table...", f);
 
-found:
-  clib_mem_free (f);
   ssvm_pop_heap (oldheap);
+  ssvm_unlock_non_recursive (sh);
 }
 
 void