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Commit 50fb5704 authored by Ilya Lesokhin's avatar Ilya Lesokhin Committed by Herbert Xu
Browse files

crypto: aesni-intel - RFC4106 can zero copy when !PageHighMem 



In the common case of !PageHighMem we can do zero copy crypto
even if sg crosses a pages boundary.

Signed-off-by: default avatarIlya Lesokhin <ilyal@mellanox.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent f262c770

arch/x86/crypto/aesni-intel_glue.c

+8 −4
Original line number Diff line number Diff line
@@ -740,9 +740,11 @@ static int helper_rfc4106_encrypt(struct aead_request *req) 
	*((__be32 *)(iv+12)) = counter;



	if (sg_is_last(req->src) &&

	    req->src->offset + req->src->length <= PAGE_SIZE &&

	    (!PageHighMem(sg_page(req->src)) ||

	    req->src->offset + req->src->length <= PAGE_SIZE) &&

	    sg_is_last(req->dst) &&

	    req->dst->offset + req->dst->length <= PAGE_SIZE) {

	    (!PageHighMem(sg_page(req->dst)) ||

	    req->dst->offset + req->dst->length <= PAGE_SIZE)) {

		one_entry_in_sg = 1;

		scatterwalk_start(&src_sg_walk, req->src);

		assoc = scatterwalk_map(&src_sg_walk);
@@ -822,9 +824,11 @@ static int helper_rfc4106_decrypt(struct aead_request *req) 
	*((__be32 *)(iv+12)) = counter;



	if (sg_is_last(req->src) &&

	    req->src->offset + req->src->length <= PAGE_SIZE &&

	    (!PageHighMem(sg_page(req->src)) ||

	    req->src->offset + req->src->length <= PAGE_SIZE) &&

	    sg_is_last(req->dst) &&

	    req->dst->offset + req->dst->length <= PAGE_SIZE) {

	    (!PageHighMem(sg_page(req->dst)) ||

	    req->dst->offset + req->dst->length <= PAGE_SIZE)) {

		one_entry_in_sg = 1;

		scatterwalk_start(&src_sg_walk, req->src);

		assoc = scatterwalk_map(&src_sg_walk);