Commit 84b15763 authored by Eric Biggers's avatar Eric Biggers Committed by Herbert Xu
Browse files

crypto: scatterwalk - add scatterwalk_get_sglist() 



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: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent bb699e72

include/crypto/scatterwalk.h

+17 −0
Original line number Diff line number Diff line
@@ -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);