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Subject[PATCH v3 10/10] crypto: caam/qi2 - add support for XTS with 16B IV
Date
From: Andrei Botila <andrei.botila@nxp.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@nxp.com>
---
drivers/crypto/caam/caamalg_qi2.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c
index 4cbd7e834888..98c1ff1744bb 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -1058,6 +1058,7 @@ 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;
@@ -1071,9 +1072,11 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
if (keylen != 2 * AES_KEYSIZE_128 && keylen != 2 * AES_KEYSIZE_256)
ctx->xts_key_fallback = true;

- err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
- if (err)
- return err;
+ if (priv->sec_attr.era <= 8 || ctx->xts_key_fallback) {
+ err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
+ if (err)
+ return err;
+ }

ctx->cdata.keylen = keylen;
ctx->cdata.key_virt = key;
@@ -1470,6 +1473,7 @@ 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;

/*
@@ -1480,7 +1484,7 @@ static int skcipher_encrypt(struct skcipher_request *req)
if (!req->cryptlen && !ctx->fallback)
return 0;

- if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+ if (ctx->fallback && ((priv->sec_attr.era <= 8 && xts_skcipher_ivsize(req)) ||
ctx->xts_key_fallback)) {
skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
skcipher_request_set_callback(&caam_req->fallback_req,
@@ -1519,6 +1523,7 @@ 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;

/*
@@ -1529,7 +1534,7 @@ static int skcipher_decrypt(struct skcipher_request *req)
if (!req->cryptlen && !ctx->fallback)
return 0;

- if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+ if (ctx->fallback && ((priv->sec_attr.era <= 8 && xts_skcipher_ivsize(req)) ||
ctx->xts_key_fallback)) {
skcipher_request_set_tfm(&caam_req->fallback_req, ctx->fallback);
skcipher_request_set_callback(&caam_req->fallback_req,
--
2.17.1
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