ring: prepare setup_rx_ring_layout for support in v2/v3

Prepare setup_rx_ring_layout for both, v2 and v3. Also do some checks
during compile time if offsets stay the same as we operate on different
union mappings.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/ring.h b/ring.h
index 5e47d37..f618a35 100644
--- a/ring.h
+++ b/ring.h
@@ -82,6 +82,13 @@ static inline unsigned int ring_frame_size(struct ring *ring)
 	return ring->layout.tp_frame_size;
 }
 
+static inline void ring_verify_layout(struct ring *ring)
+{
+	bug_on(ring->layout.tp_block_size  < ring->layout.tp_frame_size);
+	bug_on((ring->layout.tp_block_size % ring->layout.tp_frame_size) != 0);
+	bug_on((ring->layout.tp_block_size % getpagesize()) != 0);
+}
+
 static inline void tpacket_hdr_clone(struct tpacket2_hdr *thdrd,
 				     struct tpacket2_hdr *thdrs)
 {