session: first approximation implementation of tls

[vpp.git] / src / svm / svm_fifo.h

diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index f32ef41..0d85951 100644 (file)
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -36,8 +36,16 @@ typedef struct
 format_function_t format_ooo_segment;
 format_function_t format_ooo_list;
 
+#define SVM_FIFO_TRACE (0)
 #define OOO_SEGMENT_INVALID_INDEX ((u32)~0)
 
+typedef struct
+{
+  u32 offset;
+  u32 len;
+  u32 action;
+} svm_fifo_trace_elem_t;
+
 typedef struct _svm_fifo
 {
   volatile u32 cursize;                /**< current fifo size */
@@ -64,9 +72,30 @@ typedef struct _svm_fifo
   u32 ooos_newest;             /**< Last segment to have been updated */
   struct _svm_fifo *next;      /**< next in freelist/active chain */
   struct _svm_fifo *prev;      /**< prev in active chain */
+#if SVM_FIFO_TRACE
+  svm_fifo_trace_elem_t *trace;
+#endif
+  u32 freelist_index;          /**< aka log2(allocated_size) - const. */
+  i8 refcnt;                   /**< reference count  */
     CLIB_CACHE_LINE_ALIGN_MARK (data);
 } svm_fifo_t;
 
+#if SVM_FIFO_TRACE
+#define svm_fifo_trace_add(_f, _s, _l, _t)             \
+{                                                      \
+  svm_fifo_trace_elem_t *trace_elt;                    \
+  vec_add2(_f->trace, trace_elt, 1);                   \
+  trace_elt->offset = _s;                              \
+  trace_elt->len = _l;                                 \
+  trace_elt->action = _t;                              \
+}
+#else
+#define svm_fifo_trace_add(_f, _s, _l, _t)
+#endif
+
+u8 *svm_fifo_dump_trace (u8 * s, svm_fifo_t * f);
+u8 *svm_fifo_replay (u8 * s, svm_fifo_t * f, u8 no_read, u8 verbose);
+
 static inline u32
 svm_fifo_max_dequeue (svm_fifo_t * f)
 {
@@ -111,7 +140,7 @@ svm_fifo_t *svm_fifo_create (u32 data_size_in_bytes);
 void svm_fifo_free (svm_fifo_t * f);
 
 int svm_fifo_enqueue_nowait (svm_fifo_t * f, u32 max_bytes,
-                            u8 * copy_from_here);
+                            const u8 * copy_from_here);
 int svm_fifo_enqueue_with_offset (svm_fifo_t * f, u32 offset,
                                  u32 required_bytes, u8 * copy_from_here);
 int svm_fifo_dequeue_nowait (svm_fifo_t * f, u32 max_bytes, u8 * copy_here);
@@ -132,26 +161,38 @@ svm_fifo_newest_ooo_segment (svm_fifo_t * f)
   return pool_elt_at_index (f->ooo_segments, f->ooos_newest);
 }
 
+always_inline void
+svm_fifo_newest_ooo_segment_reset (svm_fifo_t * f)
+{
+  f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
+}
+
 always_inline u32
-ooo_segment_distance_to_tail (svm_fifo_t * f, u32 a)
+ooo_segment_distance_from_tail (svm_fifo_t * f, u32 pos)
 {
   /* Ambiguous. Assumption is that ooo segments don't touch tail */
-  if (a == f->tail && f->tail == f->head)
+  if (PREDICT_FALSE (pos == f->tail && f->tail == f->head))
     return f->nitems;
 
-  return ((f->nitems + a - f->tail) % f->nitems);
+  return (((f->nitems + pos) - f->tail) % f->nitems);
+}
+
+always_inline u32
+ooo_segment_distance_to_tail (svm_fifo_t * f, u32 pos)
+{
+  return (((f->nitems + f->tail) - pos) % f->nitems);
 }
 
 always_inline u32
 ooo_segment_offset (svm_fifo_t * f, ooo_segment_t * s)
 {
-  return ooo_segment_distance_to_tail (f, s->start);
+  return ooo_segment_distance_from_tail (f, s->start);
 }
 
 always_inline u32
 ooo_segment_end_offset (svm_fifo_t * f, ooo_segment_t * s)
 {
-  return ooo_segment_distance_to_tail (f, s->start) + s->length;
+  return ooo_segment_distance_from_tail (f, s->start) + s->length;
 }
 
 always_inline u32
@@ -168,6 +209,14 @@ ooo_segment_get_prev (svm_fifo_t * f, ooo_segment_t * s)
   return pool_elt_at_index (f->ooo_segments, s->prev);
 }
 
+always_inline ooo_segment_t *
+ooo_segment_next (svm_fifo_t * f, ooo_segment_t * s)
+{
+  if (s->next == OOO_SEGMENT_INVALID_INDEX)
+    return 0;
+  return pool_elt_at_index (f->ooo_segments, s->next);
+}
+
 #endif /* __included_ssvm_fifo_h__ */
 
 /*