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

Pavel Begunkov
2022-09-23T16:40:31Z

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@gmail.com>
---
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