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Commit c0048cff authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by David S. Miller
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xdp: introduce a new xdp_frame type 



This is needed to convert drivers tuntap and virtio_net.

This is a generalization of what is done inside cpumap, which will be
converted later.

Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 106ca27f

include/net/xdp.h

+40 −0
Original line number Diff line number Diff line
@@ -58,6 +58,46 @@ struct xdp_buff { 
	struct xdp_rxq_info *rxq;

};



struct xdp_frame {

	void *data;

	u16 len;

	u16 headroom;

	u16 metasize;

	/* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,

	 * while mem info is valid on remote CPU.

	 */

	struct xdp_mem_info mem;

};



/* Convert xdp_buff to xdp_frame */

static inline

struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)

{

	struct xdp_frame *xdp_frame;

	int metasize;

	int headroom;



	/* Assure headroom is available for storing info */

	headroom = xdp->data - xdp->data_hard_start;

	metasize = xdp->data - xdp->data_meta;

	metasize = metasize > 0 ? metasize : 0;

	if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))

		return NULL;



	/* Store info in top of packet */

	xdp_frame = xdp->data_hard_start;



	xdp_frame->data = xdp->data;

	xdp_frame->len  = xdp->data_end - xdp->data;

	xdp_frame->headroom = headroom - sizeof(*xdp_frame);

	xdp_frame->metasize = metasize;



	/* rxq only valid until napi_schedule ends, convert to xdp_mem_info */

	xdp_frame->mem = xdp->rxq->mem;



	return xdp_frame;

}



static inline

void xdp_return_frame(void *data, struct xdp_mem_info *mem)

{