Re: [PATCH] crypto: caam - enable crypto-engine retry mechanism

[Iuliana Prodan]

On 10/26/2020 5:36 PM, Horia Geantă wrote:
> On 10/21/2020 11:07 PM, Iuliana Prodan wrote:
> > Use the new crypto_engine_alloc_init_and_set() function to
> > initialize crypto-engine and enable retry mechanism.
> >
> > Set the maximum size for crypto-engine software queue based on
> > Job Ring size (JOBR_DEPTH) and a threshold (reserved for the
> > non-crypto-API requests that are not pass through crypto-engine).
> 				       ^ passed
>
> > The callback for do_batch_requests is NULL, since CAAM
> > doesn't support linked requests.
> >
> > Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
> > ---
> >   drivers/crypto/caam/intern.h | 3 +++
> >   drivers/crypto/caam/jr.c     | 6 +++++-
> >   2 files changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h
> > index 9112279..44fe6ee 100644
> > --- a/drivers/crypto/caam/intern.h
> > +++ b/drivers/crypto/caam/intern.h
> > @@ -16,6 +16,9 @@
> >   /* Currently comes from Kconfig param as a ^2 (driver-required) */
> >   #define JOBR_DEPTH (1 << CONFIG_CRYPTO_DEV_FSL_CAAM_RINGSIZE)
> >   
> > +#define THRESHOLD 15
> Unless there's a comment added for THRESHOLD (e.g. what's in the
> commit message), I don't think the define is helpful.
>
> > +#define CRYPTO_ENGINE_MAX_QLEN (2 * (JOBR_DEPTH - THRESHOLD))
> > +
> What's the logic behind multiplying by 2?

I added the 2 as the number of Job Rings.
My logic was that crypto-engine is one per CAAM (x no of JRs), while 
JOB_DEPTH is per JR.
I know there are targets with other than 2 JRs. Therefore, is there a 
way to get this number automatically?


Thanks,
Iulia

> >   /* Kconfig params for interrupt coalescing if selected (else zero) */
> >   #ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_INTC
> >   #define JOBR_INTC JRCFG_ICEN
> > diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
> > index 6f66996..88540c9 100644
> > --- a/drivers/crypto/caam/jr.c
> > +++ b/drivers/crypto/caam/jr.c
> > @@ -550,7 +550,11 @@ static int caam_jr_probe(struct platform_device *pdev)
> >   	}
> >   
> >   	/* Initialize crypto engine */
> > -	jrpriv->engine = crypto_engine_alloc_init(jrdev, false);
> > +	jrpriv->engine = crypto_engine_alloc_init_and_set(jrdev,
> > +							  true,
> > +							  NULL,
> > +							  false,
> > +							  CRYPTO_ENGINE_MAX_QLEN);
> Let's make the argument list more compact.
>
> Horia