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Date:   Fri, 13 Nov 2020 02:50:00 +0100
From:   Dmytro Shytyi <dmytro@shytyi.net>
To:     "Hideaki Yoshifuji" <hideaki.yoshifuji@miraclelinux.com>
Cc:     "kuba" <kuba@kernel.org>, "kuznet" <kuznet@ms2.inr.ac.ru>,
        "yoshfuji" <yoshfuji@linux-ipv6.org>,
        "liuhangbin" <liuhangbin@gmail.com>, "davem" <davem@davemloft.net>,
        "netdev" <netdev@vger.kernel.org>,
        "linux-kernel" <linux-kernel@vger.kernel.org>
Message-ID: <175bf4b8b86.dba0173e131152.3554549396274308531@shytyi.net>
In-Reply-To: <CAPA1RqDgKfcDqSOM+1TV=EesU1rynt6Z=EqbTur1Q6Xt=YvxpQ@mail.gmail.com>
References: <175b3433a4c.aea7c06513321.4158329434310691736@shytyi.net>
 <202011110944.7zNVZmvB-lkp@intel.com> <175bd218cf4.103c639bc117278.4209371191555514829@shytyi.net> <CAPA1RqDgKfcDqSOM+1TV=EesU1rynt6Z=EqbTur1Q6Xt=YvxpQ@mail.gmail.com>
Subject: Re: [PATCH net-next V3] net: Variable SLAAC: SLAAC with prefixes of
 arbitrary length in PIO
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Hello,

---- On Thu, 12 Nov 2020 17:55:08 +0100 Hideaki Yoshifuji <hideaki.yoshifuj=
i@miraclelinux.com> wrote ----

 > Hi,=20
 > =20
 > 2020=E5=B9=B411=E6=9C=8813=E6=97=A5(=E9=87=91) 0:46 Dmytro Shytyi <dmytr=
o@shytyi.net>:=20
 > >=20
 > > Variable SLAAC: SLAAC with prefixes of arbitrary length in PIO (random=
ly=20
 > > generated hostID or stable privacy + privacy extensions).=20
 > > The main problem is that SLAAC RA or PD allocates a /64 by the Wireles=
s=20
 > > carrier 4G, 5G to a mobile hotspot, however segmentation of the /64 vi=
a=20
 > > SLAAC is required so that downstream interfaces can be further subnett=
ed.=20
 > > Example: uCPE device (4G + WI-FI enabled) receives /64 via Wireless, a=
nd=20
 > > assigns /72 to VNF-Firewall, /72 to WIFI, /72 to VNF-Router, /72 to=20
 > > Load-Balancer and /72 to wired connected devices.=20
 > > IETF document that defines problem statement:=20
 > > draft-mishra-v6ops-variable-slaac-problem-stmt=20
 > > IETF document that specifies variable slaac:=20
 > > draft-mishra-6man-variable-slaac=20
 > >=20
 > > Signed-off-by: Dmytro Shytyi <dmytro@shytyi.net>=20
 > > Reported-by: kernel test robot <lkp@intel.com>=20
 > > ---=20
 > =20
 > > -       write_lock_bh(&idev->lock);=20
 > > +       int ret;=20
 > > +#if defined(CONFIG_ARCH_SUPPORTS_INT128)=20
 > > +       __int128 host_id;=20
 > > +       __int128 net_prfx;=20
 > :=20
 > =20
 > No, this does not help anything.=20
 > Please do not rely on __int128.=20

[Dmytro] Understood. Thank you.

 > --yoshfuji=20
 >=20