netdev - RE: [PATCH net-next v3 3/3] nfp: implement xfrm callbacks and expose ipsec offload feature to upper layer

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Message-ID: <DM6PR13MB3705F0963A853D5C794FC639FC3C9@DM6PR13MB3705.namprd13.prod.outlook.com>
Date:   Mon, 7 Nov 2022 09:50:41 +0000
From:   Yinjun Zhang <yinjun.zhang@...igine.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Chengtian Liu <chengtian.liu@...igine.com>,
        HuanHuan Wang <huanhuan.wang@...igine.com>,
        Louis Peens <louis.peens@...igine.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        oss-drivers <oss-drivers@...igine.com>,
        Simon Horman <simon.horman@...igine.com>
Subject: RE: [PATCH net-next v3 3/3] nfp: implement xfrm callbacks and expose
 ipsec offload feature to upper layer

On Sun, 6 Nov 2022 21:48:10 +0200, Leon Romanovsky wrote:
<...>
> > +	if (x->aalg) {
> > +		p = (__be32 *)x->aalg->alg_key;
> > +		key_len = DIV_ROUND_UP(x->aalg->alg_key_len,
> BITS_PER_BYTE);
> > +		if (key_len > sizeof(cfg->auth_key)) {
> > +			nn_err(nn, "Insufficient space for offloaded auth
> key\n");
> > +			return -EINVAL;
> > +		}
> > +		for (i = 0; i < key_len / sizeof(cfg->auth_key[0]) ; i++)
> > +			cfg->auth_key[i] = ntohl(*p++);
> 
> I wonder if you can't declare p as u32 and use memcpy here instead of
> u32->__be32->u32 conversions.

The BE/LE process is necessary as HW requires it, we'll use get_ unaligned_be32
instead to make it simpler.

> 
> Thanks