[PATCH v12 bpf-next 01/18] net: skbuff: add size metadata to skb_shared_info for xdp

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Introduce xdp_frags_tsize field in skb_shared_info data structure
to store xdp_buff/xdp_frame truesize (xdp_frags_tsize 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.
Introduce xdp_frags_size field in skb_shared_info data structure
reusing gso_type field in order to store xdp_buff/xdp_frame paged size.
xdp_frags_size will be used in xdp multi-buff support.

Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
 include/linux/skbuff.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6bdb0db3e825..1abeba7ef82e 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -522,13 +522,17 @@ struct skb_shared_info {
 	unsigned short	gso_segs;
 	struct sk_buff	*frag_list;
 	struct skb_shared_hwtstamps hwtstamps;
-	unsigned int	gso_type;
+	union {
+		unsigned int	gso_type;
+		unsigned int	xdp_frags_size;
+	};
 	u32		tskey;
 
 	/*
 	 * Warning : all fields before dataref are cleared in __alloc_skb()
 	 */
 	atomic_t	dataref;
+	unsigned int	xdp_frags_tsize;
 
 	/* Intermediate layers must ensure that destructor_arg
 	 * remains valid until skb destructor */
-- 
2.31.1




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