xdp: move struct xdp_buff from filter.h to xdp.h

This is done to prepare for the next patch, and it is also
nice to move this XDP related struct out of filter.h.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/net/xdp.h b/include/net/xdp.h
index e4207699c410..15f8ade008b5 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -50,6 +50,13 @@ struct xdp_rxq_info {
 	struct xdp_mem_info mem;
 } ____cacheline_aligned; /* perf critical, avoid false-sharing */
 
+struct xdp_buff {
+	void *data;
+	void *data_end;
+	void *data_meta;
+	void *data_hard_start;
+	struct xdp_rxq_info *rxq;
+};
 
 static inline
 void xdp_return_frame(void *data, struct xdp_mem_info *mem)
@@ -72,4 +79,19 @@ bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
 int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
 			       enum xdp_mem_type type, void *allocator);
 
+/* Drivers not supporting XDP metadata can use this helper, which
+ * rejects any room expansion for metadata as a result.
+ */
+static __always_inline void
+xdp_set_data_meta_invalid(struct xdp_buff *xdp)
+{
+	xdp->data_meta = xdp->data + 1;
+}
+
+static __always_inline bool
+xdp_data_meta_unsupported(const struct xdp_buff *xdp)
+{
+	return unlikely(xdp->data_meta > xdp->data);
+}
+
 #endif /* __LINUX_NET_XDP_H__ */