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net: introduce __skb_fill_page_desc_noacc 

Managed pages contain pinned userspace pages and controlled by upper
layers, there is no need in tracking skb->pfmemalloc for them. Introduce
a helper for filling frags but ignoring page tracking, it'll be needed
later.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov 2022-07-12 21:52:32 +01:00 committed by Jakub Kicinski
parent 753f1ca4e1
commit 84ce071e38
1 changed files with 17 additions and 11 deletions
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28
include/linux/skbuff.h
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@ -2550,6 +2550,22 @@ static inline unsigned int skb_pagelen(const struct sk_buff *skb)
return skb_headlen(skb) + __skb_pagelen(skb);
}
static inline void __skb_fill_page_desc_noacc(struct skb_shared_info *shinfo,
int i, struct page *page,
int off, int size)
{
skb_frag_t *frag = &shinfo->frags[i];
/*
* Propagate page pfmemalloc to the skb if we can. The problem is
* that not all callers have unique ownership of the page but rely
* on page_is_pfmemalloc doing the right thing(tm).
*/
frag->bv_page = page;
frag->bv_offset = off;
skb_frag_size_set(frag, size);
}
/**
* __skb_fill_page_desc - initialise a paged fragment in an skb
* @skb: buffer containing fragment to be initialised
@ -2566,17 +2582,7 @@ static inline unsigned int skb_pagelen(const struct sk_buff *skb)
static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
struct page *page, int off, int size)
{
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
/*
* Propagate page pfmemalloc to the skb if we can. The problem is
* that not all callers have unique ownership of the page but rely
* on page_is_pfmemalloc doing the right thing(tm).
*/
frag->bv_page = page;
frag->bv_offset = off;
skb_frag_size_set(frag, size);
__skb_fill_page_desc_noacc(skb_shinfo(skb), i, page, off, size);
page = compound_head(page);
if (page_is_pfmemalloc(page))
skb->pfmemalloc = true;