linux-kernel - RE: [PATCH v6 1/5] crypto: aspeed: Add HACE hash driver

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Message-ID: <HK0PR06MB320233EB0554D930CBFED3CC80BA9@HK0PR06MB3202.apcprd06.prod.outlook.com>
Date:   Thu, 30 Jun 2022 03:41:52 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
CC:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Randy Dunlap <rdunlap@...radead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Dhananjay Phadke <dhphadke@...rosoft.com>,
        Johnny Huang <johnny_huang@...eedtech.com>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "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>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: RE: [PATCH v6 1/5] crypto: aspeed: Add HACE hash driver

> -----Original Message-----
> From: Corentin Labbe <clabbe.montjoie@...il.com>
> Sent: Wednesday, June 29, 2022 8:36 PM
> To: Neal Liu <neal_liu@...eedtech.com>
> Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>; Randy Dunlap
> <rdunlap@...radead.org>; Herbert Xu <herbert@...dor.apana.org.au>; David
> S . Miller <davem@...emloft.net>; Rob Herring <robh+dt@...nel.org>;
> Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Joel Stanley
> <joel@....id.au>; Andrew Jeffery <andrew@...id.au>; Dhananjay Phadke
> <dhphadke@...rosoft.com>; Johnny Huang
> <johnny_huang@...eedtech.com>; linux-aspeed@...ts.ozlabs.org;
> linux-crypto@...r.kernel.org; devicetree@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; BMC-SW
> <BMC-SW@...eedtech.com>
> Subject: Re: [PATCH v6 1/5] crypto: aspeed: Add HACE hash driver
> 
> Le Wed, Jun 29, 2022 at 05:44:22PM +0800, Neal Liu a écrit :
> > Hash and Crypto Engine (HACE) is designed to accelerate the throughput
> > of hash data digest, encryption, and decryption.
> >
> > Basically, HACE can be divided into two independently engines
> > - Hash Engine and Crypto Engine. This patch aims to add HACE hash
> > engine driver for hash accelerator.
> >
> > Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> > Signed-off-by: Johnny Huang <johnny_huang@...eedtech.com>
> > ---
> 
> Hello
> 
> I have some minor comments below.
> 
> > +++ b/drivers/crypto/aspeed/aspeed-hace-hash.c
> > @@ -0,0 +1,1428 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (c) 2021 Aspeed Technology Inc.
> > + */
> > +
> > +#include "aspeed-hace.h"
> > +
> > +#ifdef ASPEED_AHASH_DEBUG
> > +#define AHASH_DBG(h, fmt, ...)	\
> > +	dev_dbg((h)->dev, "%s() " fmt, __func__, ##__VA_ARGS__) #else
> > +#define AHASH_DBG(h, fmt, ...)	\
> > +	((void)(h))
> > +#endif
> 
> Hello why not direclty use dev_dbg ?
> You will still need something to do to enable dev_dbg, so why force to add the
> need to re-compile it with ASPEED_AHASH_DEBUG ?

My purpose is to control its own debug logs independently.
Maybe below define is more reasonable.

#ifdef ASPEED_AHASH_DEBUG
#define AHASH_DBG dev_info()...
#else
#define AHASH_DBG dev_dbg()...
#endif

Do you agree with this?

> 
> 
> [...]
> 
> > +	if (dma_mapping_error(hace_dev->dev, rctx->digest_dma_addr)) {
> > +		dev_warn(hace_dev->dev, "dma_map() rctx digest error\n");
> > +		return -ENOMEM;
> > +	}
> 
> An error displayed as warning.
> 
> [...]
> > +	if (!sg_len) {
> > +		dev_warn(hace_dev->dev, "dma_map_sg() src error\n");
> 
> Same here. In fact you have lot of error displayed as warning in the driver.

I think both of them are fine. Would you prefer dev_err() instead?

> 
> [...]
> > +/* Weak function for HACE hash */
> > +void __weak aspeed_register_hace_hash_algs(struct aspeed_hace_dev
> > +*hace_dev) {
> > +	pr_warn("%s: Not supported yet\n", __func__); }
> > +
> > +void __weak aspeed_unregister_hace_hash_algs(struct aspeed_hace_dev
> > +*hace_dev) {
> > +	pr_warn("%s: Not supported yet\n", __func__); }
> 
> Why not use dev_warn ?

dev_warn() is better, I'll revise it in next patch.

> 
> 
> [...]
> 
> > +struct aspeed_sg_list {
> > +	u32 len;
> > +	u32 phy_addr;
> > +};
> 
> Since it is a descriptor where all member are written with cpu_to_le32(), it
> should be __le32.

Sure! I'll revise it in next patch.
Thanks.