Commit 6eaab4df authored Sep 23, 2022 by Pavel Begunkov Committed by Jakub Kicinski Sep 28, 2022

net: introduce struct ubuf_info_msgzc



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>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent 929a6cdf

include/linux/skbuff.h

+21 −0

Original line number	Diff line number	Diff line
		@@ -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);