this member is add for dummy dev to suppot zero copy

Signed-off-by: Albert Huang <huangjie.albert@bytedance.com>
---
 include/linux/skbuff.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 16a49ba534e4..db999056022e 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -592,6 +592,8 @@ struct skb_shared_info {
 	/* Intermediate layers must ensure that destructor_arg
 	 * remains valid until skb destructor */
 	void *		destructor_arg;
+	/* just for dummy device xsk zero copy */
+	void		*destructor_arg_xsk_pool;
 
 	/* must be last field, see pskb_expand_head() */
 	skb_frag_t	frags[MAX_SKB_FRAGS];
-- 
2.20.1