diff mbox series

[1/6] xdp: introduce xdp_get_shared_info_from_{buff,frame} utility routines

Message ID 9e7a2e62d6283880d79a20599519e0db4b433b5b.1594309075.git.lorenzo@kernel.org
State Changes Requested
Delegated to: David Miller
Headers show
Series rework mvneta napi_poll loop for XDP multi-buffers | expand

Commit Message

Lorenzo Bianconi July 9, 2020, 3:57 p.m. UTC 
Introduce xdp_get_shared_info_from_{buff,frame} utility routines to get
skb_shared_info from xdp buffer/frame pointer.
xdp_get_shared_info_from_{buff,frame} will be used to implement xdp
multi-buffer support

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/net/xdp.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox series

Patch

diff --git a/include/net/xdp.h b/include/net/xdp.h
index 609f819ed08b..d3005bef812f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -85,6 +85,12 @@  struct xdp_buff {
 	((xdp)->data_hard_start + (xdp)->frame_sz -	\
 	 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_buff(struct xdp_buff *xdp)
+{
+	return (struct skb_shared_info *)xdp_data_hard_end(xdp);
+}
+
 struct xdp_frame {
 	void *data;
 	u16 len;
@@ -98,6 +104,15 @@  struct xdp_frame {
 	struct net_device *dev_rx; /* used by cpumap */
 };
 
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_frame(struct xdp_frame *frame)
+{
+	void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);
+
+	return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
+				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
+}
+
 /* Clear kernel pointers in xdp_frame */
 static inline void xdp_scrub_frame(struct xdp_frame *frame)
 {