[PATCH v7 10/23] drivers: crypto: meson: avoid kzalloc in engine thread

From: Alexey Romanov
Date: Thu Apr 11 2024 - 09:41:33 EST

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It makes no sense to allocate memory via kzalloc, we
can use static buffer, speedup data processing and
don't think about kfree() calls.

Signed-off-by: Alexey Romanov <avromanov@xxxxxxxxxxxxxxxxx>
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
---
drivers/crypto/amlogic/amlogic-gxl-cipher.c | 52 +++++++++------------
drivers/crypto/amlogic/amlogic-gxl.h | 4 +-
2 files changed, 25 insertions(+), 31 deletions(-)

diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
index dd2478ae7c54..eeb86c900f84 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
@@ -59,7 +59,7 @@ static bool meson_cipher_need_fallback(struct skcipher_request *areq)
static int meson_cipher_do_fallback(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
int err;
#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
@@ -91,7 +91,6 @@ struct cipher_ctx {
struct skcipher_request *areq;
struct scatterlist *src_sg;
struct scatterlist *dst_sg;
- void *bkeyiv;

unsigned int src_offset;
unsigned int dst_offset;
@@ -147,7 +146,7 @@ static void meson_setup_keyiv_descs(struct cipher_ctx *ctx)
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct meson_alg_template *algt = container_of(alg,
struct meson_alg_template, alg.skcipher.base);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_dev *mc = op->mc;
unsigned int ivsize = crypto_skcipher_ivsize(tfm);
unsigned int blockmode = algt->blockmode;
@@ -157,7 +156,7 @@ static void meson_setup_keyiv_descs(struct cipher_ctx *ctx)
return;

if (blockmode == DESC_OPMODE_CBC) {
- memcpy(ctx->bkeyiv + AES_MAX_KEY_SIZE, ctx->areq->iv, ivsize);
+ memcpy(op->keyiv + AES_MAX_KEY_SIZE, ctx->areq->iv, ivsize);
dma_sync_single_for_device(mc->dev, ctx->keyiv.addr,
ctx->keyiv.len, DMA_TO_DEVICE);
}
@@ -179,7 +178,7 @@ static bool meson_setup_data_descs(struct cipher_ctx *ctx)
{
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(ctx->areq);
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ctx->areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct meson_alg_template *algt = container_of(alg,
struct meson_alg_template,
@@ -222,7 +221,7 @@ static int meson_kick_hardware(struct cipher_ctx *ctx)
{
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(ctx->areq);
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(ctx->areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct meson_alg_template *algt = container_of(alg,
struct meson_alg_template,
@@ -291,7 +290,7 @@ static int meson_kick_hardware(struct cipher_ctx *ctx)
static int meson_cipher(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
struct meson_dev *mc = op->mc;
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
@@ -304,6 +303,7 @@ static int meson_cipher(struct skcipher_request *areq)
.dst_sg = areq->dst,
.cryptlen = areq->cryptlen,
};
+ unsigned int ivsize = crypto_skcipher_ivsize(tfm);
int err;

dev_dbg(mc->dev, "%s %s %u %x IV(%u) key=%u ctx.flow=%d\n", __func__,
@@ -319,21 +319,21 @@ static int meson_cipher(struct skcipher_request *areq)
mc->chanlist[rctx->flow].stat_req++;
#endif

- ctx.bkeyiv = kzalloc(48, GFP_KERNEL | GFP_DMA);
- if (!ctx.bkeyiv)
- return -ENOMEM;
-
- memcpy(ctx.bkeyiv, op->key, op->keylen);
ctx.keyiv.len = op->keylen;
if (ctx.keyiv.len == AES_KEYSIZE_192)
ctx.keyiv.len = AES_MAX_KEY_SIZE;

- ctx.keyiv.addr = dma_map_single(mc->dev, ctx.bkeyiv, ctx.keyiv.len,
+ if (algt->blockmode == DESC_OPMODE_CBC) {
+ memcpy(op->keyiv + AES_MAX_KEY_SIZE, areq->iv, ivsize);
+ ctx.keyiv.len = AES_MAX_KEY_SIZE + ivsize;
+ }
+
+ ctx.keyiv.addr = dma_map_single(mc->dev, op->keyiv, ctx.keyiv.len,
DMA_TO_DEVICE);
err = dma_mapping_error(mc->dev, ctx.keyiv.addr);
if (err) {
dev_err(mc->dev, "Cannot DMA MAP KEY IV\n");
- goto free_keyiv;
+ return err;
}

err = meson_map_scatterlist(areq, mc);
@@ -367,9 +367,6 @@ static int meson_cipher(struct skcipher_request *areq)
unmap_keyiv:
dma_unmap_single(mc->dev, ctx.keyiv.addr, ctx.keyiv.len, DMA_TO_DEVICE);

-free_keyiv:
- kfree_sensitive(ctx.bkeyiv);
-
return err;
}

@@ -389,7 +386,7 @@ int meson_handle_cipher_request(struct crypto_engine *engine, void *areq)
static int meson_skdecrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
struct crypto_engine *engine;
int e;
@@ -407,7 +404,7 @@ static int meson_skdecrypt(struct skcipher_request *areq)
static int meson_skencrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
struct crypto_engine *engine;
int e;
@@ -424,7 +421,7 @@ static int meson_skencrypt(struct skcipher_request *areq)

static int meson_cipher_init(struct crypto_tfm *tfm)
{
- struct meson_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_tfm_ctx_dma(tfm);
struct meson_alg_template *algt;
const char *name = crypto_tfm_alg_name(tfm);
struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
@@ -450,16 +447,15 @@ static int meson_cipher_init(struct crypto_tfm *tfm)

static void meson_cipher_exit(struct crypto_tfm *tfm)
{
- struct meson_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_tfm_ctx_dma(tfm);

- kfree_sensitive(op->key);
crypto_free_skcipher(op->fallback_tfm);
}

static int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
- struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
+ struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
struct meson_dev *mc = op->mc;

switch (keylen) {
@@ -476,11 +472,9 @@ static int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
dev_dbg(mc->dev, "ERROR: Invalid keylen %u\n", keylen);
return -EINVAL;
}
- kfree_sensitive(op->key);
+
+ memcpy(op->keyiv, key, keylen);
op->keylen = keylen;
- op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
- if (!op->key)
- return -ENOMEM;

return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}
@@ -498,7 +492,7 @@ static struct meson_alg_template algs[] = {
.cra_flags = CRYPTO_ALG_TYPE_SKCIPHER |
CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY |
CRYPTO_ALG_NEED_FALLBACK,
- .cra_ctxsize = sizeof(struct meson_cipher_tfm_ctx),
+ .cra_ctxsize = sizeof(struct meson_cipher_tfm_ctx) + CRYPTO_DMA_PADDING,
.cra_module = THIS_MODULE,
.cra_alignmask = 0xf,
.cra_init = meson_cipher_init,
@@ -527,7 +521,7 @@ static struct meson_alg_template algs[] = {
.cra_flags = CRYPTO_ALG_TYPE_SKCIPHER |
CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY |
CRYPTO_ALG_NEED_FALLBACK,
- .cra_ctxsize = sizeof(struct meson_cipher_tfm_ctx),
+ .cra_ctxsize = sizeof(struct meson_cipher_tfm_ctx) + CRYPTO_DMA_PADDING,
.cra_module = THIS_MODULE,
.cra_alignmask = 0xf,
.cra_init = meson_cipher_init,
diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
index f3455babb52a..9b950c83e79d 100644
--- a/drivers/crypto/amlogic/amlogic-gxl.h
+++ b/drivers/crypto/amlogic/amlogic-gxl.h
@@ -127,14 +127,14 @@ struct meson_cipher_req_ctx {

/*
* struct meson_cipher_tfm_ctx - context for a skcipher TFM
- * @key: pointer to key data
+ * @keyiv: key data
* @keylen: len of the key
* @keymode: The keymode(type and size of key) associated with this TFM
* @mc: pointer to the private data of driver handling this TFM
* @fallback_tfm: pointer to the fallback TFM
*/
struct meson_cipher_tfm_ctx {
- u32 *key;
+ u8 keyiv[AES_MAX_KEY_SIZE + AES_BLOCK_SIZE];
u32 keylen;
u32 keymode;
struct meson_dev *mc;
--
2.34.1

Next message: Alexey Romanov: "[PATCH v7 13/23] drivers: crypto: meson: use fallback for 192-bit keys"
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In reply to: Alexey Romanov: "[PATCH v7 09/23] drivers: crypto: meson: process more than MAXDESCS descriptors"
Next in thread: Alexey Romanov: "[PATCH v7 13/23] drivers: crypto: meson: use fallback for 192-bit keys"
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