ring: Move common ring block_r/frame_nr shrinking to generic function

Merge shrinking code duplicated for RX/TX rings into an own generic
function.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 8 insertions, 0 deletions

diff --git a/ring.h b/ring.h
index 6517a80..4153b9c 100644
--- a/ring.h
+++ b/ring.h
@@ -145,6 +145,14 @@ static inline void ring_verify_layout(struct ring *ring)
 	bug_on((ring->layout.tp_block_size % RUNTIME_PAGE_SIZE) != 0);
 }
 
+static inline void shrink_ring_layout_generic(struct ring *ring)
+{
+	ring->layout.tp_block_nr >>= 1;
+	ring->layout.tp_frame_nr = ring->layout.tp_block_size /
+				   ring->layout.tp_frame_size *
+				   ring->layout.tp_block_nr;
+}
+
 static inline void tpacket_hdr_clone(struct tpacket2_hdr *thdrd,
 				     struct tpacket2_hdr *thdrs)
 {