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: Ilya Lesokhin <ilyal@mellanox.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -740,9 +740,11 @@ static int helper_rfc4106_encrypt(struct aead_request *req)
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*((__be32 *)(iv+12)) = counter;
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if (sg_is_last(req->src) &&
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req->src->offset + req->src->length <= PAGE_SIZE &&
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(!PageHighMem(sg_page(req->src)) ||
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req->src->offset + req->src->length <= PAGE_SIZE) &&
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sg_is_last(req->dst) &&
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req->dst->offset + req->dst->length <= PAGE_SIZE) {
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(!PageHighMem(sg_page(req->dst)) ||
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req->dst->offset + req->dst->length <= PAGE_SIZE)) {
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one_entry_in_sg = 1;
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scatterwalk_start(&src_sg_walk, req->src);
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assoc = scatterwalk_map(&src_sg_walk);
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@ -822,9 +824,11 @@ static int helper_rfc4106_decrypt(struct aead_request *req)
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*((__be32 *)(iv+12)) = counter;
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if (sg_is_last(req->src) &&
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req->src->offset + req->src->length <= PAGE_SIZE &&
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(!PageHighMem(sg_page(req->src)) ||
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req->src->offset + req->src->length <= PAGE_SIZE) &&
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sg_is_last(req->dst) &&
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req->dst->offset + req->dst->length <= PAGE_SIZE) {
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(!PageHighMem(sg_page(req->dst)) ||
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req->dst->offset + req->dst->length <= PAGE_SIZE)) {
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one_entry_in_sg = 1;
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scatterwalk_start(&src_sg_walk, req->src);
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assoc = scatterwalk_map(&src_sg_walk);
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