linux-kernel - [PATCH 9/9] crypto: caam/qi2 - add support for XTS with 16B IV

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Message-Id: <20200806114127.8650-10-andrei.botila@oss.nxp.com>
Date:   Thu,  6 Aug 2020 14:41:27 +0300
From:   Andrei Botila <andrei.botila@....nxp.com>
To:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] crypto: caam/qi2 - add support for XTS with 16B IV

From: Andrei Botila <andrei.botila@....com>

Newer CAAM versions (Era 9+) support 16B IVs. Since for these devices
the HW limitation is no longer present newer version should process the
requests containing 16B IVs directly in hardware without using a fallback.

Signed-off-by: Andrei Botila <andrei.botila@....com>
---
 drivers/crypto/caam/caamalg_qi2.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c
index f2f137f47972..99b1267b1a0b 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -1057,6 +1057,7 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
 {
 	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
 	struct device *dev = ctx->dev;
+	struct dpaa2_caam_priv *priv = dev_get_drvdata(dev);
 	struct caam_flc *flc;
 	u32 *desc;
 	int err;
@@ -1067,9 +1068,12 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
 		return err;
 	}
 
-	err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
-	if (err)
-		return err;
+	if (priv->sec_attr.era <= 8 || (keylen != 2 * AES_KEYSIZE_128 &&
+					keylen != 2 * AES_KEYSIZE_256)) {
+		err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
+		if (err)
+			return err;
+	}
 
 	ctx->cdata.keylen = keylen;
 	ctx->cdata.key_virt = key;
@@ -1472,12 +1476,13 @@ static int skcipher_encrypt(struct skcipher_request *req)
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
 	struct caam_request *caam_req = skcipher_request_ctx(req);
+	struct dpaa2_caam_priv *priv = dev_get_drvdata(ctx->dev);
 	int ret;
 
 	if (!req->cryptlen)
 		return 0;
 
-	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+	if (ctx->fallback && ((priv->sec_attr.era <= 8 && xts_skcipher_ivsize(req)) ||
 			      (ctx->cdata.keylen != 2 * AES_KEYSIZE_128 &&
 			       ctx->cdata.keylen != 2 * AES_KEYSIZE_256))) {
 		skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
@@ -1517,12 +1522,13 @@ static int skcipher_decrypt(struct skcipher_request *req)
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct caam_ctx *ctx = crypto_skcipher_ctx(skcipher);
 	struct caam_request *caam_req = skcipher_request_ctx(req);
+	struct dpaa2_caam_priv *priv = dev_get_drvdata(ctx->dev);
 	int ret;
 
 	if (!req->cryptlen)
 		return 0;
 
-	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+	if (ctx->fallback && ((priv->sec_attr.era <= 8 && xts_skcipher_ivsize(req)) ||
 			      (ctx->cdata.keylen != 2 * AES_KEYSIZE_128 &&
 			       ctx->cdata.keylen != 2 * AES_KEYSIZE_256))) {
 		skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
-- 
2.17.1