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net: generalize sk_alloc_sg to work with scatterlist rings

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The current implementation of sk_alloc_sg expects scatterlist to always
start at entry 0 and complete at entry MAX_SKB_FRAGS.

Future patches will want to support starting at arbitrary offset into
scatterlist so add an additional sg_start parameters and then default
to the current values in TLS code paths.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend
2018-03-18 12:57:05 -07:00
committed by Daniel Borkmann
parent 312fc2b4c8
commit 8c05dbf04b
3 changed files with 19 additions and 14 deletions
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2
include/net/sock.h
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@@ -2142,7 +2142,7 @@ static inline struct page_frag *sk_page_frag(struct sock *sk)
bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
int sk_alloc_sg(struct sock *sk, int len, struct scatterlist *sg,
int *sg_num_elem, unsigned int *sg_size,
int sg_start, int *sg_curr, unsigned int *sg_size,
int first_coalesce);
/*