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

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

Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ilya Lesokhin 2016-12-13 16:32:06 +02:00 committed by Herbert Xu
parent f262c77064
commit 50fb570424
1 changed files with 8 additions and 4 deletions
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12
arch/x86/crypto/aesni-intel_glue.c
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@ -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);