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From:   Horia Geanta <horia.geanta@nxp.com>
To:     Iuliana Prodan <iuliana.prodan@nxp.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Aymen Sghaier <aymen.sghaier@nxp.com>
CC:     "David S. Miller" <davem@davemloft.net>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v2 09/10] crypto: caam - add crypto_engine support for RSA
 algorithms
Thread-Topic: [PATCH v2 09/10] crypto: caam - add crypto_engine support for
 RSA algorithms
Thread-Index: AQHVwdGq8rD6kVc2eEOuvzLis67wVg==
Date:   Mon, 13 Jan 2020 12:21:36 +0000
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On 1/13/2020 11:48 AM, Iuliana Prodan wrote:=0A=
> On 1/10/2020 10:46 AM, Horia Geanta wrote:=0A=
>> On 1/3/2020 3:03 AM, Iuliana Prodan wrote:=0A=
>>> +static int akcipher_enqueue_req(struct device *jrdev, u32 *desc,=0A=
>>> +				void (*cbk)(struct device *jrdev, u32 *desc,=0A=
>>> +					    u32 err, void *context),=0A=
>>> +				struct akcipher_request *req,=0A=
>>> +				struct rsa_edesc *edesc)=0A=
>>> +{=0A=
>>> +	struct caam_drv_private_jr *jrpriv =3D dev_get_drvdata(jrdev);=0A=
>>> +	struct crypto_akcipher *tfm =3D crypto_akcipher_reqtfm(req);=0A=
>>> +	struct caam_rsa_ctx *ctx =3D akcipher_tfm_ctx(tfm);=0A=
>>> +	struct caam_rsa_key *key =3D &ctx->key;=0A=
>>> +	int ret;=0A=
>>> +=0A=
>>> +	if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)=0A=
>>> +		return crypto_transfer_akcipher_request_to_engine(jrpriv->engine,=0A=
>>> +								  req);=0A=
>> Resource leak in case transfer fails.=0A=
>>=0A=
>>> +	else=0A=
>>> +		ret =3D caam_jr_enqueue(jrdev, desc, cbk, &edesc->jrentry);=0A=
>> What's the problem with transferring all requests to crypto engine?=0A=
>>=0A=
> I'll address all your comments in v3.=0A=
> =0A=
> Regarding the transfer request to crypto-engine: if sending all requests =
=0A=
> to crypto-engine, multibuffer tests, for non-backlogging requests fail =
=0A=
> after only 10 requests, since crypto-engine queue has 10 entries.=0A=
> Here's an example:=0A=
> root@imx6qpdlsolox:~# insmod tcrypt.ko mode=3D422 num_mb=3D1024=0A=
> insmod: ERROR: could not insert module tcrypt.ko: Resource temporarily =
=0A=
> unavailable=0A=
> root@imx6qpdlsolox:~#=0A=
> root@imx6qpdlsolox:~# dmesg=0A=
> ...=0A=
> testing speed of multibuffer sha1 (sha1-caam)=0A=
> tcrypt: test  0 (   16 byte blocks,   16 bytes per update,   1 updates):=
=0A=
> tcrypt: concurrent request 11 error -28=0A=
> tcrypt: concurrent request 13 error -28=0A=
> tcrypt: concurrent request 14 error -28=0A=
> tcrypt: concurrent request 16 error -28=0A=
> tcrypt: concurrent request 18 error -28=0A=
> tcrypt: concurrent request 20 error -28=0A=
> tcrypt: concurrent request 22 error -28=0A=
> tcrypt: concurrent request 24 error -28=0A=
> tcrypt: concurrent request 26 error -28=0A=
> tcrypt: concurrent request 28 error -28=0A=
> tcrypt: concurrent request 30 error -28=0A=
> tcrypt: concurrent request 32 error -28=0A=
> tcrypt: concurrent request 34 error -28=0A=
> =0A=
> tcrypt: concurrent request 1020 error -28=0A=
> tcrypt: concurrent request 1022 error -28=0A=
> tcrypt: At least one hashing failed ret=3D-28=0A=
> root@imx6qpdlsolox:~#=0A=
> =0A=
> If sending just the backlog request to crypto-engine, and non-blocking =
=0A=
> directly to CAAM, these tests have a better chance to pass since JR has =
=0A=
> 1024 entries.=0A=
> =0A=
> Will need to work/update crypto-engine: set queue length when initialize =
=0A=
> crypto-engine, and remove serialization of requests in crypto-engine. =0A=
> But, until then, I would like to have a backlogging solution in CAAM driv=
er.=0A=
> =0A=
My point is you need to add details about the current limitations=0A=
in the commit message (even in the source code, it wouldn't hurt),=0A=
justifying the choice of not using crypto engine for all requests.=0A=
=0A=
Horia=0A=