xdp: introduce xdp_get_shared_info_from_{buff, frame} utility routines (2f0bc54b) · Commits · 戴 / test

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> Signed-off-by:

David S. Miller <davem@davemloft.net>

include/net/xdp.h

+15 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{

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