[PATCH 11/12] crypto: caam - add crypto_engine support for RSA algorithms

From: Iuliana Prodan
Date: Sun Nov 17 2019 - 17:31:18 EST

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In reply to: Horia Geanta: "Re: [PATCH 07/12] crypto: caam - refactor caam_jr_enqueue"
Next in thread: Horia Geanta: "Re: [PATCH 11/12] crypto: caam - add crypto_engine support for RSA algorithms"
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Add crypto_engine support for RSA algorithms, to make use of
the engine queue.
The requests, with backlog flag, will be listed into crypto-engine
queue and processed by CAAM when free. In case the queue is empty,
the request is directly sent to CAAM.

Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
---
drivers/crypto/caam/caampkc.c | 124 ++++++++++++++++++++++++++++++------------
drivers/crypto/caam/caampkc.h | 8 +++
drivers/crypto/caam/jr.c | 3 +
3 files changed, 101 insertions(+), 34 deletions(-)

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index bb0e4b9..8ffce06 100644
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -118,19 +118,28 @@ static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
{
struct caam_jr_request_entry *jrentry = context;
struct akcipher_request *req = akcipher_request_cast(jrentry->base);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
struct rsa_edesc *edesc;
int ecode = 0;

if (err)
ecode = caam_jr_strstatus(dev, err);

- edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+ edesc = req_ctx->edesc;

rsa_pub_unmap(dev, edesc, req);
rsa_io_unmap(dev, edesc, req);
kfree(edesc);

- akcipher_request_complete(req, ecode);
+ /*
+ * If no backlog flag, the completion of the request is done
+ * by CAAM, not crypto engine.
+ */
+ if (!jrentry->bklog)
+ akcipher_request_complete(req, ecode);
+ else
+ crypto_finalize_akcipher_request(jrp->engine, req, ecode);
}

static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
@@ -139,15 +148,17 @@ static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
struct caam_jr_request_entry *jrentry = context;
struct akcipher_request *req = akcipher_request_cast(jrentry->base);
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
struct caam_rsa_key *key = &ctx->key;
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct rsa_edesc *edesc;
int ecode = 0;

if (err)
ecode = caam_jr_strstatus(dev, err);

- edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+ edesc = req_ctx->edesc;

switch (key->priv_form) {
case FORM1:
@@ -163,7 +174,14 @@ static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
rsa_io_unmap(dev, edesc, req);
kfree(edesc);

- akcipher_request_complete(req, ecode);
+ /*
+ * If no backlog flag, the completion of the request is done
+ * by CAAM, not crypto engine.
+ */
+ if (!jrentry->bklog)
+ akcipher_request_complete(req, ecode);
+ else
+ crypto_finalize_akcipher_request(jrp->engine, req, ecode);
}

/**
@@ -311,14 +329,16 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;

+ edesc->jrentry.base = &req->base;
+
+ req_ctx->edesc = edesc;
+
if (!sec4_sg_bytes)
return edesc;

edesc->mapped_src_nents = mapped_src_nents;
edesc->mapped_dst_nents = mapped_dst_nents;

- edesc->jrentry.base = &req->base;
-
edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
sec4_sg_bytes, DMA_TO_DEVICE);
if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
@@ -343,6 +363,34 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
return ERR_PTR(-ENOMEM);
}

+static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
+{
+ int ret;
+ struct akcipher_request *req = akcipher_request_cast(areq);
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+ struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_jr_request_entry *jrentry;
+ struct device *jrdev = ctx->dev;
+ u32 *desc = req_ctx->edesc->hw_desc;
+
+ jrentry = &req_ctx->edesc->jrentry;
+ jrentry->bklog = true;
+
+ ret = caam_jr_enqueue_no_bklog(jrdev, desc, req_ctx->akcipher_op_done,
+ jrentry);
+
+ if (ret != -EINPROGRESS) {
+ rsa_pub_unmap(jrdev, req_ctx->edesc, req);
+ rsa_io_unmap(jrdev, req_ctx->edesc, req);
+ kfree(req_ctx->edesc);
+ } else {
+ ret = 0;
+ }
+
+ return ret;
+}
+
static int set_rsa_pub_pdb(struct akcipher_request *req,
struct rsa_edesc *edesc)
{
@@ -610,10 +658,11 @@ static int caam_rsa_enc(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct caam_rsa_key *key = &ctx->key;
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
- struct caam_jr_request_entry *jrentry;
+ u32 *desc;
int ret;

if (unlikely(!key->n || !key->e))
@@ -635,14 +684,14 @@ static int caam_rsa_enc(struct akcipher_request *req)
if (ret)
goto init_fail;

- /* Initialize Job Descriptor */
- init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
+ desc = edesc->hw_desc;

- jrentry = &edesc->jrentry;
- jrentry->base = &req->base;
+ /* Initialize Job Descriptor */
+ init_rsa_pub_desc(desc, &edesc->pdb.pub);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, jrentry);
- if (ret == -EINPROGRESS)
+ req_ctx->akcipher_op_done = rsa_pub_done;
+ ret = caam_jr_enqueue(jrdev, desc, rsa_pub_done, &edesc->jrentry);
+ if (ret == -EINPROGRESS || ret == -EBUSY)
return ret;

rsa_pub_unmap(jrdev, edesc, req);
@@ -657,9 +706,10 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
- struct caam_jr_request_entry *jrentry;
+ u32 *desc;
int ret;

/* Allocate extended descriptor */
@@ -672,14 +722,14 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
if (ret)
goto init_fail;

- /* Initialize Job Descriptor */
- init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
+ desc = edesc->hw_desc;

- jrentry = &edesc->jrentry;
- jrentry->base = &req->base;
+ /* Initialize Job Descriptor */
+ init_rsa_priv_f1_desc(desc, &edesc->pdb.priv_f1);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, jrentry);
- if (ret == -EINPROGRESS)
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ ret = caam_jr_enqueue(jrdev, desc, rsa_priv_f_done, &edesc->jrentry);
+ if (ret == -EINPROGRESS || ret == -EBUSY)
return ret;

rsa_priv_f1_unmap(jrdev, edesc, req);
@@ -694,9 +744,10 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
- struct caam_jr_request_entry *jrentry;
+ u32 *desc;
int ret;

/* Allocate extended descriptor */
@@ -709,14 +760,14 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
if (ret)
goto init_fail;

- /* Initialize Job Descriptor */
- init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
+ desc = edesc->hw_desc;

- jrentry = &edesc->jrentry;
- jrentry->base = &req->base;
+ /* Initialize Job Descriptor */
+ init_rsa_priv_f2_desc(desc, &edesc->pdb.priv_f2);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, jrentry);
- if (ret == -EINPROGRESS)
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ ret = caam_jr_enqueue(jrdev, desc, rsa_priv_f_done, &edesc->jrentry);
+ if (ret == -EINPROGRESS || ret == -EBUSY)
return ret;

rsa_priv_f2_unmap(jrdev, edesc, req);
@@ -731,9 +782,10 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
- struct caam_jr_request_entry *jrentry;
+ u32 *desc;
int ret;

/* Allocate extended descriptor */
@@ -746,14 +798,14 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
if (ret)
goto init_fail;

- /* Initialize Job Descriptor */
- init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
+ desc = edesc->hw_desc;

- jrentry = &edesc->jrentry;
- jrentry->base = &req->base;
+ /* Initialize Job Descriptor */
+ init_rsa_priv_f3_desc(desc, &edesc->pdb.priv_f3);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, jrentry);
- if (ret == -EINPROGRESS)
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ ret = caam_jr_enqueue(jrdev, desc, rsa_priv_f_done, &edesc->jrentry);
+ if (ret == -EINPROGRESS || ret == -EBUSY)
return ret;

rsa_priv_f3_unmap(jrdev, edesc, req);
@@ -1049,6 +1101,10 @@ static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
return -ENOMEM;
}

+ ctx->enginectx.op.do_one_request = akcipher_do_one_req;
+
+ akcipher_set_reqsize(tfm, sizeof(struct caam_rsa_req_ctx));
+
return 0;
}

diff --git a/drivers/crypto/caam/caampkc.h b/drivers/crypto/caam/caampkc.h
index fe46d73..d31b040 100644
--- a/drivers/crypto/caam/caampkc.h
+++ b/drivers/crypto/caam/caampkc.h
@@ -13,6 +13,7 @@
#include "compat.h"
#include "intern.h"
#include "pdb.h"
+#include <crypto/engine.h>

/**
* caam_priv_key_form - CAAM RSA private key representation
@@ -88,11 +89,13 @@ struct caam_rsa_key {

/**
* caam_rsa_ctx - per session context.
+ * @enginectx : crypto engine context
* @key : RSA key in DMA zone
* @dev : device structure
* @padding_dma : dma address of padding, for adding it to the input
*/
struct caam_rsa_ctx {
+ struct crypto_engine_ctx enginectx;
struct caam_rsa_key key;
struct device *dev;
dma_addr_t padding_dma;
@@ -104,11 +107,16 @@ struct caam_rsa_ctx {
* @src : input scatterlist (stripped of leading zeros)
* @fixup_src : input scatterlist (that might be stripped of leading zeros)
* @fixup_src_len : length of the fixup_src input scatterlist
+ * @edesc : s/w-extended rsa descriptor
+ * @akcipher_op_done : callback used when operation is done
*/
struct caam_rsa_req_ctx {
struct scatterlist src[2];
struct scatterlist *fixup_src;
unsigned int fixup_src_len;
+ struct rsa_edesc *edesc;
+ void (*akcipher_op_done)(struct device *jrdev, u32 *desc, u32 err,
+ void *context);
};

/**
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 7e6632d..579b1ba 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -437,6 +437,9 @@ static int transfer_request_to_engine(struct crypto_engine *engine,
case CRYPTO_ALG_TYPE_AEAD:
return crypto_transfer_aead_request_to_engine(engine,
aead_request_cast(req));
+ case CRYPTO_ALG_TYPE_AKCIPHER:
+ return crypto_transfer_akcipher_request_to_engine(engine,
+ akcipher_request_cast(req));
default:
return -EINVAL;
}
--
2.1.0

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Next in thread: Horia Geanta: "Re: [PATCH 11/12] crypto: caam - add crypto_engine support for RSA algorithms"
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