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net: shrink struct ubuf_info

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We can benefit from a smaller struct ubuf_info, so leave only mandatory
fields and let users to decide how they want to extend it. Convert
MSG_ZEROCOPY to struct ubuf_info_msgzc and remove duplicated fields.
This reduces the size from 48 bytes to just 16.

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 17:39:04 +01:00 • committed by Jakub Kicinski
parent dfff202be5
commit e7d2b51016
5 changed files with 28 additions and 38 deletions
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22
include/linux/skbuff.h
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@ -533,25 +533,8 @@ enum {
struct ubuf_info {
void (*callback)(struct sk_buff *, struct ubuf_info *,
bool zerocopy_success);
union {
struct {
unsigned long desc;
void *ctx;
};
struct {
u32 id;
u16 len;
u16 zerocopy:1;
u32 bytelen;
};
};
refcount_t refcnt;
u8 flags;
struct mmpin {
struct user_struct *user;
unsigned int num_pg;
} mmp;
};
struct ubuf_info_msgzc {
@ -570,7 +553,10 @@ struct ubuf_info_msgzc {
};
};
struct mmpin mmp;
struct mmpin {
struct user_struct *user;
unsigned int num_pg;
} mmp;
};
#define skb_uarg(SKB) ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))