[PATCH net-next 1/4] net: introduce struct ubuf_info_msgzc

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

We're going to split struct ubuf_info and leave there only
mandatory fields. Users are free to extend it. Add struct
ubuf_info_msgzc, which will be an extended version for MSG_ZEROCOPY and
some other users. It duplicates of struct ubuf_info for now and will be
removed in a couple of patches.

Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
 include/linux/skbuff.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f15d5b62539b..fd7dcb977fdf 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -554,7 +554,28 @@ struct ubuf_info {
        } mmp;
 };
 
+struct ubuf_info_msgzc {
+       struct ubuf_info ubuf;
+
+       union {
+               struct {
+                       unsigned long desc;
+                       void *ctx;
+               };
+               struct {
+                       u32 id;
+                       u16 len;
+                       u16 zerocopy:1;
+                       u32 bytelen;
+               };
+       };
+
+       struct mmpin mmp;
+};
+
 #define skb_uarg(SKB)  ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))
+#define uarg_to_msgzc(ubuf_ptr)        container_of((ubuf_ptr), struct 
ubuf_info_msgzc, \
+                                            ubuf)
 
 int mm_account_pinned_pages(struct mmpin *mmp, size_t size);
 void mm_unaccount_pinned_pages(struct mmpin *mmp);
-- 
2.37.2