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Subject: Re: [lustre-devel] [PATCH] staging: lustre: delete the filesystem
 from the tree.
From:   Alexey Lyashkov <alexey.lyashkov@gmail.com>
In-Reply-To: <CF1B7A14-3C16-4CD1-8274-C6A3E0065624@dilger.ca>
Date:   Mon, 4 Jun 2018 07:17:48 +0300
Cc:     NeilBrown <neilb@suse.com>,
        Andreas Dilger <andreas.dilger@intel.com>,
        "devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
        Oleg Drokin <oleg.drokin@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Christoph Hellwig <hch@infradead.org>,
        "selinux@tycho.nsa.gov" <selinux@tycho.nsa.gov>,
        fsdevel <linux-fsdevel@vger.kernel.org>,
        lustre-devel <lustre-devel@lists.lustre.org>
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References: <20180601091133.GA27521@kroah.com>
 <20180601114151.GA25225@infradead.org>
 <E5BF8501-35EB-4DDF-ADBE-6016CF31A502@dilger.ca>
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 <58123CDD-8424-4E1D-A11F-0F899970A49B@intel.com>
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 <FE290581-D17D-4CEC-9AE2-B79DCBBD0823@gmail.com>
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To:     Andreas Dilger <adilger@dilger.ca>
Sender: linux-kernel-owner@vger.kernel.org
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> 4 =D0=B8=D1=8E=D0=BD=D1=8F 2018 =D0=B3., =D0=B2 7:15, Andreas Dilger =
<adilger@dilger.ca> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>=20
> On Jun 3, 2018, at 9:59 PM, Alexey Lyashkov =
<alexey.lyashkov@gmail.com> wrote:
>>=20
>>> On Sun, Jun 03 2018, Dilger, Andreas wrote:
>>>=20
>>>> LNet is originally based on a high-performance networking stack =
called
>>>> Portals (v3, http://www.cs.sandia.gov/Portals/), with additions for =
LNet
>>>> routing to allow cross-network bridging.
>>>>=20
>>>> A critical part of LNet is that it is for RDMA and not packet-based
>>>> messages.  Everything in Lustre is structured around RDMA.  Of =
course,
>>>> RDMA is not possible with TCP
>>=20
>> To be clear. Soft IB (aka Soft RoCE) driver is part of OFED stack =
from 4.8
>> (or 4.9).  So RDMA API now is possible with TCP networks.
>=20
> Well, strictly speaking RoCE still isn't possible with TCP networks.  =
RoCE v1
> is an Ethernet layer protocol (not IP based), while RoCE v2 is UDP/IP =
based.
>=20
>=20
Andreas,

I talk about RXE driver in OFED stack. It have works over TCP networks.
It likely to be RoCE v2 compatible as UDP tunnel use and exist for =
while.


Alex