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Message-ID: <20171022065936.GA8489@Red>
Date: Sun, 22 Oct 2017 08:59:36 +0200
From: Corentin Labbe <clabbe.montjoie@...il.com>
To: Fabien DESSENNE <fabien.dessenne@...com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre TORGUE <alexandre.torgue@...com>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Lionel DEBIEVE <lionel.debieve@...com>,
Benjamin GAIGNARD <benjamin.gaignard@...com>,
Ludovic BARRE <ludovic.barre@...com>
Subject: Re: [PATCH v4 2/2] crypto: stm32 - Support for STM32 CRYP crypto
module
On Thu, Oct 19, 2017 at 01:01:56PM +0000, Fabien DESSENNE wrote:
> Hi Corentin
>
>
> Thank you for your comments. I will fix according to them. See also me
> answers/questions below
>
> While we are at it, do you plan to deliver a new version of the
> crypto_engine update? (I had to remove the AEAD part of this new driver
> since it depends on that pending update)
No plan, I do not like the Herbert proposal, so it is a bit hard to progress on it.
>
> BR
>
> Fabien
>
>
> On 19/10/17 12:34, Corentin Labbe wrote:
> > Hello
> >
> > I have some minor comment below
> >
> > On Thu, Oct 19, 2017 at 11:03:59AM +0200, Fabien Dessenne wrote:
> >> This module registers block cipher algorithms that make use of the
> >> STMicroelectronics STM32 crypto "CRYP1" hardware.
> >> The following algorithms are supported:
> >> - aes: ecb, cbc, ctr
> >> - des: ecb, cbc
> >> - tdes: ecb, cbc
> >>
> >> Signed-off-by: Fabien Dessennie <fabien.dessenne@...com>
> >> ---
> >> drivers/crypto/stm32/Kconfig | 9 +
> >> drivers/crypto/stm32/Makefile | 3 +-
> >> drivers/crypto/stm32/stm32-cryp.c | 1188 +++++++++++++++++++++++++++++++++++++
> >> 3 files changed, 1199 insertions(+), 1 deletion(-)
> >> create mode 100644 drivers/crypto/stm32/stm32-cryp.c
> >>
> >> diff --git a/drivers/crypto/stm32/Kconfig b/drivers/crypto/stm32/Kconfig
> >> index 602332e..61ef00b 100644
> >> --- a/drivers/crypto/stm32/Kconfig
> >> +++ b/drivers/crypto/stm32/Kconfig
> > [...]
> >> +/* Bit [0] encrypt / decrypt */
> >> +#define FLG_ENCRYPT BIT(0)
> >> +/* Bit [8..1] algo & operation mode */
> >> +#define FLG_AES BIT(1)
> >> +#define FLG_DES BIT(2)
> >> +#define FLG_TDES BIT(3)
> >> +#define FLG_ECB BIT(4)
> >> +#define FLG_CBC BIT(5)
> >> +#define FLG_CTR BIT(6)
> >> +/* Mode mask = bits [15..0] */
> >> +#define FLG_MODE_MASK GENMASK(15, 0)
> >> +
> >> +/* Registers */
> >> +#define CRYP_CR 0x00000000
> >> +#define CRYP_SR 0x00000004
> >> +#define CRYP_DIN 0x00000008
> >> +#define CRYP_DOUT 0x0000000C
> >> +#define CRYP_DMACR 0x00000010
> >> +#define CRYP_IMSCR 0x00000014
> >> +#define CRYP_RISR 0x00000018
> >> +#define CRYP_MISR 0x0000001C
> >> +#define CRYP_K0LR 0x00000020
> >> +#define CRYP_K0RR 0x00000024
> >> +#define CRYP_K1LR 0x00000028
> >> +#define CRYP_K1RR 0x0000002C
> >> +#define CRYP_K2LR 0x00000030
> >> +#define CRYP_K2RR 0x00000034
> >> +#define CRYP_K3LR 0x00000038
> >> +#define CRYP_K3RR 0x0000003C
> >> +#define CRYP_IV0LR 0x00000040
> >> +#define CRYP_IV0RR 0x00000044
> >> +#define CRYP_IV1LR 0x00000048
> >> +#define CRYP_IV1RR 0x0000004C
> >> +
> >> +/* Registers values */
> >> +#define CR_DEC_NOT_ENC 0x00000004
> >> +#define CR_TDES_ECB 0x00000000
> >> +#define CR_TDES_CBC 0x00000008
> >> +#define CR_DES_ECB 0x00000010
> >> +#define CR_DES_CBC 0x00000018
> >> +#define CR_AES_ECB 0x00000020
> >> +#define CR_AES_CBC 0x00000028
> >> +#define CR_AES_CTR 0x00000030
> >> +#define CR_AES_KP 0x00000038
> >> +#define CR_AES_UNKNOWN 0xFFFFFFFF
> >> +#define CR_ALGO_MASK 0x00080038
> >> +#define CR_DATA32 0x00000000
> >> +#define CR_DATA16 0x00000040
> >> +#define CR_DATA8 0x00000080
> >> +#define CR_DATA1 0x000000C0
> >> +#define CR_KEY128 0x00000000
> >> +#define CR_KEY192 0x00000100
> >> +#define CR_KEY256 0x00000200
> >> +#define CR_FFLUSH 0x00004000
> >> +#define CR_CRYPEN 0x00008000
> > Why not using BIT(x) ?
>
> Some values are not only 1 bit (then we may use BIT and BITGEN but this
> would be less readable), so I prefer to keep this values.
>
> > Why not using also directly FLG_XX since CR_XX are arbitray values ? like using instead CR_AES_CBC = FLG_AES | FLG_CBC
>
> The CR_ values are used to write in the registers. FLG_ are arbitraty
> values, so we cannot mix them.
I think you could do without FLG_XXX and use instead register values (spliting algo and block mode values is necessary in that case)
>
> >
> > [...]
> >> +static inline void stm32_cryp_wait_enable(struct stm32_cryp *cryp)
> >> +{
> >> + while (stm32_cryp_read(cryp, CRYP_CR) & CR_CRYPEN)
> >> + cpu_relax();
> >> +}
> > This function is not used, so you could remove it
> >
> >> +
> >> +static inline void stm32_cryp_wait_busy(struct stm32_cryp *cryp)
> >> +{
> >> + while (stm32_cryp_read(cryp, CRYP_SR) & SR_BUSY)
> >> + cpu_relax();
> >> +}
> > No timeout ?
> >
> >
> >> +
> >> +static inline void stm32_cryp_wait_output(struct stm32_cryp *cryp)
> >> +{
> >> + while (!(stm32_cryp_read(cryp, CRYP_SR) & SR_OFNE))
> >> + cpu_relax();
> >> +}
> > This function is not used, so you could remove it
> >
> > [...]
> >> +static int stm32_cryp_check_aligned(struct scatterlist *sg, size_t total,
> >> + size_t align)
> >> +{
> >> + int len = 0;
> >> +
> >> + if (!total)
> >> + return 0;
> >> +
> >> + if (!IS_ALIGNED(total, align))
> >> + return -EINVAL;
> >> +
> >> + while (sg) {
> >> + if (!IS_ALIGNED(sg->offset, sizeof(u32)))
> >> + return -1;
> > -1 is not a good return value, prefer any -Exxxx
> >
> >> +
> >> + if (!IS_ALIGNED(sg->length, align))
> >> + return -1;
> >> +
> >> + len += sg->length;
> >> + sg = sg_next(sg);
> >> + }
> >> +
> >> + if (len != total)
> >> + return -1;
> > [...]
> >> +static int stm32_cryp_copy_sgs(struct stm32_cryp *cryp)
> >> +{
> >> + void *buf_in, *buf_out;
> >> + int pages, total_in, total_out;
> >> +
> >> + if (!stm32_cryp_check_io_aligned(cryp)) {
> >> + cryp->sgs_copied = 0;
> >> + return 0;
> >> + }
> >> +
> >> + total_in = ALIGN(cryp->total_in, cryp->hw_blocksize);
> >> + pages = total_in ? get_order(total_in) : 1;
> >> + buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
> >> +
> >> + total_out = ALIGN(cryp->total_out, cryp->hw_blocksize);
> >> + pages = total_out ? get_order(total_out) : 1;
> >> + buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
> >> +
> >> + if (!buf_in || !buf_out) {
> >> + pr_err("Couldn't allocate pages for unaligned cases.\n");
> > You must use dev_err() instead. without it, it will be hard to know which subsystem said that error message.
> >
> > [...]
> >> +static int stm32_cryp_cra_init(struct crypto_tfm *tfm)
> >> +{
> >> + tfm->crt_ablkcipher.reqsize = sizeof(struct stm32_cryp_reqctx);
> >> +
> >> + return 0;
> >> +}
> > You could simply remove this function
>
> I am not sure we can. Here we set reqsize.
> Most of the other drivers do the same, but maybe this is wrong everywhere.
> Could you give more details?
>
Forget what I said, I was wrong. Sorry
Regards
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