SVM_FIFO_NO_DEQ_NOTIF = 0, /**< No notification requested */
SVM_FIFO_WANT_DEQ_NOTIF = 1, /**< Notify on dequeue */
SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL = 2, /**< Notify on transition from full */
- SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY = 4, /**< Notify on transition to empty */
+ SVM_FIFO_WANT_DEQ_NOTIF_IF_EMPTY = 4, /**< Notify on transition to empty */
} svm_fifo_deq_ntf_t;
typedef enum svm_fifo_flag_
* @param max_bytes max bytes to be mapped to fifo segments
* @return number of bytes in fifo segments or SVM_FIFO_EEMPTY
*/
-int svm_fifo_segments (svm_fifo_t * f, u32 offset, svm_fifo_seg_t * fs,
- u32 n_segs, u32 max_bytes);
+int svm_fifo_segments (svm_fifo_t *f, u32 offset, svm_fifo_seg_t *fs,
+ u32 *n_segs, u32 max_bytes);
/**
* Add io events subscriber to list
*
*/
u32 svm_fifo_max_write_chunk (svm_fifo_t * f);
-/**
- * Fifo head chunk getter
- *
- * @param f fifo
- * @return head chunk pointer
- */
-static inline svm_fifo_chunk_t *
-svm_fifo_head_chunk (svm_fifo_t * f)
-{
- return f_head_cptr (f);
-}
-
-/**
- * Fifo head pointer getter
- *
- * @param f fifo
- * @return head pointer
- */
-static inline u8 *
-svm_fifo_head (svm_fifo_t * f)
-{
- svm_fifo_chunk_t *head_chunk;
- if (!f->shr->head_chunk)
- return 0;
- /* load-relaxed: consumer owned index */
- head_chunk = f_head_cptr (f);
- return (head_chunk->data + (f->shr->head - head_chunk->start_byte));
-}
-
-/**
- * Fifo tail chunk getter
- *
- * @param f fifo
- * @return tail chunk pointer
- */
-static inline svm_fifo_chunk_t *
-svm_fifo_tail_chunk (svm_fifo_t * f)
-{
- return f_tail_cptr (f);
-}
-
-/**
- * Fifo tail pointer getter
- *
- * @param f fifo
- * @return tail pointer
- */
-static inline u8 *
-svm_fifo_tail (svm_fifo_t * f)
-{
- svm_fifo_chunk_t *tail_chunk;
-
- /* load-relaxed: producer owned index */
- tail_chunk = f_tail_cptr (f);
- return (tail_chunk->data + (f->shr->tail - tail_chunk->start_byte));
-}
-
/**
* Fifo number of subscribers getter
*
if (PREDICT_TRUE (want_ntf == SVM_FIFO_NO_DEQ_NOTIF))
return 0;
else if (want_ntf & SVM_FIFO_WANT_DEQ_NOTIF)
- return 1;
+ return (svm_fifo_max_enqueue (f) >= f->shr->deq_thresh);
if (want_ntf & SVM_FIFO_WANT_DEQ_NOTIF_IF_FULL)
{
u32 max_deq = svm_fifo_max_dequeue_cons (f);
return 0;
}
+/**
+ * Set the fifo dequeue threshold which will be used for notifications.
+ *
+ * Note: If not set, by default threshold is zero, equivalent to
+ * generating notification on each dequeue event.
+ */
+static inline void
+svm_fifo_set_deq_thresh (svm_fifo_t *f, u32 thresh)
+{
+ f->shr->deq_thresh = thresh;
+}
+
#endif /* __included_ssvm_fifo_h__ */
/*