Re: How to use SMB Direct

[ronnie sahlberg <ronniesahlberg@gmail.com>]

On Thu, Dec 19, 2019 at 12:34 PM Xiaoli Feng <xifeng@redhat.com> wrote:
>
> Thanks Ronnie for the information. Last question: Is it supported that mount the windows file
> server(has rdma hardware) with SMB Direct in linux client(has rdma hardware)?

Yeah, that should definitely work. I think Steve, or a colleague, has
run through the same set of the tests in our buildbot
(manually?) in that configuration.

If you can please test the work-in-progress cifsd kernel server.
It should supposedly work with soft-rdma and if it does then that
could be a way where we could
integrate SMBDirect testing in the buildbot.

I haven't had any time to research cifsd or set it up and test unfortunately :-(

regards
ronnie sahlberg

>
> ----- Original Message -----
> > From: "ronnie sahlberg" <ronniesahlberg@gmail.com>
> > To: "Xiaoli Feng" <xifeng@redhat.com>
> > Cc: "Tom Talpey" <ttalpey@microsoft.com>, "linux-cifs" <linux-cifs@vger.kernel.org>
> > Sent: Wednesday, December 18, 2019 4:12:32 PM
> > Subject: Re: How to use SMB Direct
> >
> > I don't think samba supports SMB Direct.
> > Metze used to have a private repo with some experimental patches but I
> > don't think it
> > has landed in official samba yet.
> >
> > For a linux server, there is an experimental kernel based server
> > called cifsd which should support SMBDirect
> > but is incomplete in other areas. It is not part of linus tree yet
> > (but soon I hope).
> >
> > Windows servers support SMBDirect but I am not aware of any soft-rdma
> > support so you might be
> > limited to just using real hw for any tests.
> >
> > Linux serverside SMBD support is not ready afaik.
> >
> > On Wed, Dec 18, 2019 at 12:49 PM Xiaoli Feng <xifeng@redhat.com> wrote:
> > >
> > > Hello Tom,
> > >
> > > Then I try to use IP to mount, it show this error:
> > > [79912.177783] CIFS VFS: _smbd_get_connection:1740 rdma_connect failed
> > > port=5445
> > > [79912.220723] CIFS VFS: _smbd_get_connection:1740 rdma_connect failed
> > > port=445
> > >
> > > Client:
> > > $ mount //172.31.0.250/cifs cifs -o user=root,password=redhat,rdma
> > > mount error(2): No such file or directory
> > > Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
> > >
> > > Server:
> > > $ ib addr |grep 172.31.0.250/
> > > mlx4_ib0:               Link UP, Interface UP   172.31.0.250/24
> > >
> > > Samba version is 4.11.2. And firewalld is stopped.
> > >
> > > ----- Original Message -----
> > > > From: "Tom Talpey" <ttalpey@microsoft.com>
> > > > To: "Xiaoli Feng" <xifeng@redhat.com>, linux-cifs@vger.kernel.org
> > > > Sent: Tuesday, December 17, 2019 1:11:24 AM
> > > > Subject: RE: How to use SMB Direct
> > > >
> > > > > -----Original Message-----
> > > > > From: linux-cifs-owner@vger.kernel.org
> > > > > <linux-cifs-owner@vger.kernel.org>
> > > > > On
> > > > > Behalf Of Xiaoli Feng
> > > > > Sent: Monday, December 16, 2019 10:30 AM
> > > > > To: linux-cifs@vger.kernel.org
> > > > > Subject: [EXTERNAL] How to use SMB Direct
> > > > >
> > > > > Hello guys,
> > > > >
> > > > > I'd like to test SMB Direct. But it's failed. I'm not sure if it works
> > > > > in
> > > > > upstream.
> > > > > I setup samba server on one rdma machine with 5.5.0-rc1+ kernel. The
> > > > > smb.conf is:
> > > > > [cifs]
> > > > > path=/mnt/cifs
> > > > > writeable=yes
> > > > >
> > > > > Then I try to mount the share on another rdma machine with 5.5.0-rc1+
> > > > > kernel.
> > > > >    mount //$RDMA/cifs cifs -o user=root,password=$password,rdma
> > > > >
> > > > > It's failed because of "CIFS VFS: smbd_create_id:614
> > > > > rdma_resolve_addr()
> > > > > completed -113"
> > > >
> > > > Errno 113 is "no route to host". Sounds like a network or address issue.
> > > >
> > > > Tom.
> > > >
> > > > > Does SMB Direct work fine in upstream?
> > > > >
> > > > > Thanks.
> > > > >
> > > > > $ cat /boot/config-5.5.0-rc1+ |grep SMB_DIRECT
> > > > > CONFIG_CIFS_SMB_DIRECT=y
> > > > > $ ibstat
> > > > > CA 'mlx4_0'
> > > > >     CA type: MT4099
> > > > >     Number of ports: 2
> > > > >     Firmware version: 2.42.5000
> > > > >     Hardware version: 1
> > > > >     Node GUID: 0xf4521403007be0e0
> > > > >     System image GUID: 0xf4521403007be0e3
> > > > >     Port 1:
> > > > >             State: Active
> > > > >             Physical state: LinkUp
> > > > >             Rate: 56
> > > > >             Base lid: 29
> > > > >             LMC: 0
> > > > >             SM lid: 1
> > > > >             Capability mask: 0x0259486a
> > > > >             Port GUID: 0xf4521403007be0e1
> > > > >             Link layer: InfiniBand
> > > > >     Port 2:
> > > > >             State: Active
> > > > >             Physical state: LinkUp
> > > > >             Rate: 40
> > > > >             Base lid: 44
> > > > >             LMC: 1
> > > > >             SM lid: 36
> > > > >             Capability mask: 0x02594868
> > > > >             Port GUID: 0xf4521403007be0e2
> > > > >             Link layer: InfiniBand
> > > > >
> > > > >
> > > > > --
> > > > > Best regards!
> > > > > XiaoLi Feng 冯小丽
> > > > >
> > > > > Red Hat Software (Beijing) Co.,Ltd
> > > > > filesystem-qe Team
> > > > > IRC:xifeng，#channel: fs-qe
> > > > > Tel:+86-10-8388112
> > > > > 9/F, Raycom
> > > >
> > > >
> > >
> >
> >
>