X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fsvm%2Fsvm_fifo.h;h=39cdcc06a0cfcab297b54ffc21eed27b223fd841;hb=7fb0fe1f6972a7a35146fa9115b866ba29a6fbb7;hp=0d859513853814af5155c2a48c719fa919c79605;hpb=371ca50a74a9c4f1b74c4c1b65c6fdec610fcfc3;p=vpp.git

diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h
index 0d859513853..39cdcc06a0c 100644
--- a/src/svm/svm_fifo.h
+++ b/src/svm/svm_fifo.h
@@ -80,6 +80,11 @@ typedef struct _svm_fifo
     CLIB_CACHE_LINE_ALIGN_MARK (data);
 } svm_fifo_t;
 
+typedef enum
+{
+  SVM_FIFO_FULL = -2,
+} svm_fifo_err_t;
+
 #if SVM_FIFO_TRACE
 #define svm_fifo_trace_add(_f, _s, _l, _t)		\
 {							\
@@ -150,6 +155,7 @@ int svm_fifo_dequeue_drop (svm_fifo_t * f, u32 max_bytes);
 u32 svm_fifo_number_ooo_segments (svm_fifo_t * f);
 ooo_segment_t *svm_fifo_first_ooo_segment (svm_fifo_t * f);
 void svm_fifo_init_pointers (svm_fifo_t * f, u32 pointer);
+void svm_fifo_overwrite_head (svm_fifo_t * f, u8 * data, u32 len);
 
 format_function_t format_svm_fifo;
 
@@ -167,6 +173,49 @@ svm_fifo_newest_ooo_segment_reset (svm_fifo_t * f)
   f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
 }
 
+/**
+ * Max contiguous chunk of data that can be read
+ */
+always_inline u32
+svm_fifo_max_read_chunk (svm_fifo_t * f)
+{
+  return ((f->tail > f->head) ? (f->tail - f->head) : (f->nitems - f->head));
+}
+
+/**
+ * Max contiguous chunk of data that can be written
+ */
+always_inline u32
+svm_fifo_max_write_chunk (svm_fifo_t * f)
+{
+  return ((f->tail >= f->head) ? (f->nitems - f->tail) : (f->head - f->tail));
+}
+
+/**
+ * Advance tail pointer
+ *
+ * Useful for moving tail pointer after external enqueue.
+ */
+always_inline void
+svm_fifo_enqueue_nocopy (svm_fifo_t * f, u32 bytes)
+{
+  ASSERT (bytes <= svm_fifo_max_enqueue (f));
+  f->tail = (f->tail + bytes) % f->nitems;
+  f->cursize += bytes;
+}
+
+always_inline u8 *
+svm_fifo_head (svm_fifo_t * f)
+{
+  return (f->data + f->head);
+}
+
+always_inline u8 *
+svm_fifo_tail (svm_fifo_t * f)
+{
+  return (f->data + f->tail);
+}
+
 always_inline u32
 ooo_segment_distance_from_tail (svm_fifo_t * f, u32 pos)
 {