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SubjectRe: [PATCH v2 09/10] crypto: caam - add crypto_engine support for RSA algorithms
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On 1/10/2020 10:46 AM, Horia Geanta wrote:
> On 1/3/2020 3:03 AM, Iuliana Prodan wrote:
>> +static int akcipher_enqueue_req(struct device *jrdev, u32 *desc,
>> + void (*cbk)(struct device *jrdev, u32 *desc,
>> + u32 err, void *context),
>> + struct akcipher_request *req,
>> + struct rsa_edesc *edesc)
>> +{
>> + struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
>> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
>> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
>> + struct caam_rsa_key *key = &ctx->key;
>> + int ret;
>> +
>> + if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
>> + return crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
>> + req);
> Resource leak in case transfer fails.
>
>> + else
>> + ret = caam_jr_enqueue(jrdev, desc, cbk, &edesc->jrentry);
> What's the problem with transferring all requests to crypto engine?
>
I'll address all your comments in v3.

Regarding the transfer request to crypto-engine: if sending all requests
to crypto-engine, multibuffer tests, for non-backlogging requests fail
after only 10 requests, since crypto-engine queue has 10 entries.
Here's an example:
root@imx6qpdlsolox:~# insmod tcrypt.ko mode=422 num_mb=1024
insmod: ERROR: could not insert module tcrypt.ko: Resource temporarily
unavailable
root@imx6qpdlsolox:~#
root@imx6qpdlsolox:~# dmesg
...
testing speed of multibuffer sha1 (sha1-caam)
tcrypt: test 0 ( 16 byte blocks, 16 bytes per update, 1 updates):
tcrypt: concurrent request 11 error -28
tcrypt: concurrent request 13 error -28
tcrypt: concurrent request 14 error -28
tcrypt: concurrent request 16 error -28
tcrypt: concurrent request 18 error -28
tcrypt: concurrent request 20 error -28
tcrypt: concurrent request 22 error -28
tcrypt: concurrent request 24 error -28
tcrypt: concurrent request 26 error -28
tcrypt: concurrent request 28 error -28
tcrypt: concurrent request 30 error -28
tcrypt: concurrent request 32 error -28
tcrypt: concurrent request 34 error -28

tcrypt: concurrent request 1020 error -28
tcrypt: concurrent request 1022 error -28
tcrypt: At least one hashing failed ret=-28
root@imx6qpdlsolox:~#

If sending just the backlog request to crypto-engine, and non-blocking
directly to CAAM, these tests have a better chance to pass since JR has
1024 entries.

Will need to work/update crypto-engine: set queue length when initialize
crypto-engine, and remove serialization of requests in crypto-engine.
But, until then, I would like to have a backlogging solution in CAAM driver.

Iulia

>> +
>> + if (ret != -EINPROGRESS) {
>> + switch (key->priv_form) {
>> + case FORM1:
>> + rsa_priv_f1_unmap(jrdev, edesc, req);
>> + break;
>> + case FORM2:
>> + rsa_priv_f2_unmap(jrdev, edesc, req);
>> + break;
>> + case FORM3:
>> + rsa_priv_f3_unmap(jrdev, edesc, req);
>> + break;
>> + default:
>> + rsa_pub_unmap(jrdev, edesc, req);
>> + }
>> + rsa_io_unmap(jrdev, edesc, req);
>> + kfree(edesc);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> 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;
>> @@ -637,13 +726,9 @@ static int caam_rsa_enc(struct akcipher_request *req)
>> /* Initialize Job Descriptor */
>> init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
>>
>> - ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done,
>> - &edesc->jrentry);
>> - if (ret == -EINPROGRESS)
>> - return ret;
>> -
>> - rsa_pub_unmap(jrdev, edesc, req);
>> -
>> + req_ctx->akcipher_op_done = rsa_pub_done;
> This initialization could be moved into akcipher_enqueue_req().
>
>> + return akcipher_enqueue_req(jrdev, edesc->hw_desc, rsa_pub_done,
>> + req, edesc);
> edesc, edesc->hw_desc parameters not needed - can be deduced internally
> via req -> req_ctx -> edesc- > hw_desc.
>
> Horia
>


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