[PATCH v18 bpf-next 01/23] net: skbuff: add size metadata to skb_shared_info for xdp

Introduce xdp_frags_size field in skb_shared_info data structure
to store xdp_buff/xdp_frame frame paged size (xdp_frags_size will
be used in xdp multi-buff support). In order to not increase
skb_shared_info size we will use a hole due to skb_shared_info
alignment.

Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jesper Dangaard Brouer <redacted>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/linux/skbuff.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0bd6520329f6..de85a76afbc1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h

@@ -529,6 +529,7 @@ struct skb_shared_info {
 	 * Warning : all fields before dataref are cleared in __alloc_skb()
 	 */
 	atomic_t	dataref;
+	unsigned int	xdp_frags_size;
 
 	/* Intermediate layers must ensure that destructor_arg
 	 * remains valid until skb destructor */

-- 
2.31.1