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-rw-r--r--src/svm/svm_fifo.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c
index 018827e0343..0c258b4259c 100644
--- a/src/svm/svm_fifo.c
+++ b/src/svm/svm_fifo.c
@@ -835,6 +835,53 @@ svm_fifo_dequeue_drop_all (svm_fifo_t * f)
__sync_fetch_and_sub (&f->cursize, f->cursize);
}
+int
+svm_fifo_segments (svm_fifo_t * f, svm_fifo_segment_t * fs)
+{
+ u32 cursize, nitems;
+
+ /* read cursize, which can only increase while we're working */
+ cursize = svm_fifo_max_dequeue (f);
+ if (PREDICT_FALSE (cursize == 0))
+ return -2;
+
+ nitems = f->nitems;
+
+ fs[0].len = ((nitems - f->head) < cursize) ? (nitems - f->head) : cursize;
+ fs[0].data = f->data + f->head;
+
+ if (fs[0].len < cursize)
+ {
+ fs[1].len = cursize - fs[0].len;
+ fs[1].data = f->data;
+ }
+ else
+ {
+ fs[1].len = 0;
+ fs[1].data = 0;
+ }
+ return cursize;
+}
+
+void
+svm_fifo_segments_free (svm_fifo_t * f, svm_fifo_segment_t * fs)
+{
+ u32 total_drop_bytes;
+
+ ASSERT (fs[0].data == f->data + f->head);
+ if (fs[1].len)
+ {
+ f->head = fs[1].len;
+ total_drop_bytes = fs[0].len + fs[1].len;
+ }
+ else
+ {
+ f->head = (f->head + fs[0].len) % f->nitems;
+ total_drop_bytes = fs[0].len;
+ }
+ __sync_fetch_and_sub (&f->cursize, total_drop_bytes);
+}
+
u32
svm_fifo_number_ooo_segments (svm_fifo_t * f)
{