ring: add necessary structures and helper functions for v3

Prepare and add some structures an helper functions for TPACKET_V3.

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

2 files changed, 15 insertions, 1 deletions

diff --git a/ring.h b/ring.h
index facda23..5e47d37 100644
--- a/ring.h
+++ b/ring.h
@@ -31,12 +31,21 @@ struct frame_map {
 	struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket2_hdr));
 };
 
+struct block_desc {
+	uint32_t version;
+	uint32_t offset_to_priv;
+	struct tpacket_hdr_v1 h1;
+};
+
 struct ring {
 	struct iovec *frames;
 	uint8_t *mm_space;
 	size_t mm_len;
-	struct tpacket_req layout;
 	struct sockaddr_ll s_ll;
+	union {
+		struct tpacket_req layout;
+		struct tpacket_req3 layout3;
+	};
 };
 
 static inline void next_rnd_slot(unsigned int *it, struct ring *ring)
diff --git a/ring_rx.h b/ring_rx.h
index 8d695e5..0e0478c 100644
--- a/ring_rx.h
+++ b/ring_rx.h
@@ -28,4 +28,9 @@ static inline void kernel_may_pull_from_rx(struct tpacket2_hdr *hdr)
 	hdr->tp_status = TP_STATUS_KERNEL;
 }
 
+static inline void kernel_may_pull_from_rx_block(struct block_desc *pbd)
+{
+	pbd->h1.block_status = TP_STATUS_KERNEL;
+}
+
 #endif /* RX_RING_H */