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net: introduce struct ubuf_info_msgzc

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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>
This commit is contained in:
Pavel Begunkov 2022-09-23 17:39:01 +01:00 • committed by Jakub Kicinski
parent 929a6cdfae
commit 6eaab4dfdd
1 changed files with 21 additions and 0 deletions
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21
include/linux/skbuff.h
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@ -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);