Re: How to use SMB Direct

[ronnie sahlberg <ronniesahlberg@gmail.com>]

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
> >
> >
>