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crypto: scatterwalk - add scatterwalk_get_sglist()

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Add a function that creates a scatterlist that represents the remaining
data in a walk.  This will be used to replace chain_to_walk() in
net/tls/tls_device_fallback.c so that it will no longer need to reach
into the internals of struct scatter_walk.

Cc: Boris Pismenny <borisp@nvidia.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2025-02-19 10:23:27 -08:00 committed by Herbert Xu
parent bb699e724f
commit 84b1576355
1 changed files with 17 additions and 0 deletions
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17
include/crypto/scatterwalk.h
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@ -69,6 +69,23 @@ static inline struct page *scatterwalk_page(struct scatter_walk *walk)
return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
}
/*
* Create a scatterlist that represents the remaining data in a walk. Uses
* chaining to reference the original scatterlist, so this uses at most two
* entries in @sg_out regardless of the number of entries in the original list.
* Assumes that sg_init_table() was already done.
*/
static inline void scatterwalk_get_sglist(struct scatter_walk *walk,
struct scatterlist sg_out[2])
{
if (walk->offset >= walk->sg->offset + walk->sg->length)
scatterwalk_start(walk, sg_next(walk->sg));
sg_set_page(sg_out, sg_page(walk->sg),
walk->sg->offset + walk->sg->length - walk->offset,
walk->offset);
scatterwalk_crypto_chain(sg_out, sg_next(walk->sg), 2);
}
static inline void scatterwalk_unmap(void *vaddr)
{
kunmap_local(vaddr);