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SubjectRe: [Patch v3 02/19] CIFS: SMBD: Add SMBDirect protocol and transport constants
Probably easier to configure in /proc/fs/cifs than as module param

On Wed, Aug 30, 2017 at 1:30 PM, Pavel Shilovsky via samba-technical
<samba-technical@lists.samba.org> wrote:
> 2017-08-30 11:24 GMT-07:00 Long Li <longli@microsoft.com>:
>>> -----Original Message-----
>>> From: Pavel Shilovsky [mailto:piastryyy@gmail.com]
>>> Sent: Wednesday, August 30, 2017 11:19 AM
>>> To: Long Li <longli@microsoft.com>
>>> Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-
>>> cifs@vger.kernel.org>; samba-technical <samba-technical@lists.samba.org>;
>>> Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-
>>> rdma@vger.kernel.org; Christoph Hellwig <hch@infradead.org>; Tom Talpey
>>> <ttalpey@microsoft.com>; Matthew Wilcox <mawilcox@microsoft.com>
>>> Subject: Re: [Patch v3 02/19] CIFS: SMBD: Add SMBDirect protocol and
>>> transport constants
>>>
>>> 2017-08-29 16:00 GMT-07:00 Long Li <longli@microsoft.com>:
>>> >> -----Original Message-----
>>> >> From: Pavel Shilovsky [mailto:piastryyy@gmail.com]
>>> >> Sent: Tuesday, August 29, 2017 3:45 PM
>>> >> To: Long Li <longli@microsoft.com>
>>> >> Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-
>>> >> cifs@vger.kernel.org>; samba-technical
>>> >> <samba-technical@lists.samba.org>;
>>> >> Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-
>>> >> rdma@vger.kernel.org; Christoph Hellwig <hch@infradead.org>; Tom
>>> >> Talpey <ttalpey@microsoft.com>; Matthew Wilcox
>>> >> <mawilcox@microsoft.com>; Long Li <longli@microsoft.com>
>>> >> Subject: Re: [Patch v3 02/19] CIFS: SMBD: Add SMBDirect protocol and
>>> >> transport constants
>>> >>
>>> >> 2017-08-29 12:28 GMT-07:00 Long Li <longli@exchange.microsoft.com>:
>>> >> > From: Long Li <longli@microsoft.com>
>>> >> >
>>> >> > To prepare for protocol implementation, add constants and
>>> >> > user-configurable values in the SMBDirect protocol.
>>> >> >
>>> >> > Signed-off-by: Long Li <longli@microsoft.com>
>>> >> > ---
>>> >> > fs/cifs/smbdirect.c | 78
>>> >> > +++++++++++++++++++++++++++++++++++++++++++++++++++++
>>> >> > fs/cifs/smbdirect.h | 20 ++++++++++++++
>>> >> > 2 files changed, 98 insertions(+)
>>> >> > create mode 100644 fs/cifs/smbdirect.c create mode 100644
>>> >> > fs/cifs/smbdirect.h
>>> >> >
>>> >> > diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c new file
>>> >> > mode
>>> >> > 100644 index 0000000..d785bc1
>>> >> > --- /dev/null
>>> >> > +++ b/fs/cifs/smbdirect.c
>>> >> > @@ -0,0 +1,78 @@
>>> >> > +/*
>>> >> > + * Copyright (C) 2017, Microsoft Corporation.
>>> >> > + *
>>> >> > + * Author(s): Long Li <longli@microsoft.com>
>>> >> > + *
>>> >> > + * This program is free software; you can redistribute it and/or modify
>>> >> > + * it under the terms of the GNU General Public License as published
>>> by
>>> >> > + * the Free Software Foundation; either version 2 of the License, or
>>> >> > + * (at your option) any later version.
>>> >> > + *
>>> >> > + * This program is distributed in the hope that it will be useful,
>>> >> > + * but WITHOUT ANY WARRANTY; without even the implied warranty
>>> of
>>> >> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
>>> >> > + * the GNU General Public License for more details.
>>> >> > + */
>>> >> > +#include <linux/module.h>
>>> >> > +#include "smbdirect.h"
>>> >> > +#include "cifs_debug.h"
>>> >> > +
>>> >> > +/* SMBD version number */
>>> >> > +#define SMBD_V1 0x0100
>>> >> > +
>>> >> > +/* Port numbers for SMBD transport */
>>> >> > +#define SMB_PORT 445
>>> >> > +#define SMBD_PORT 5445
>>> >> > +
>>> >> > +/* Address lookup and resolve timeout in ms */
>>> >> > +#define RDMA_RESOLVE_TIMEOUT 5000
>>> >> > +
>>> >> > +/* SMBD negotiation timeout in seconds */ #define
>>> >> > +SMBD_NEGOTIATE_TIMEOUT 120
>>> >> > +
>>> >> > +/* SMBD minimum receive size and fragmented sized defined in [MS-
>>> >> SMBD] */
>>> >> > +#define SMBD_MIN_RECEIVE_SIZE 128
>>> >> > +#define SMBD_MIN_FRAGMENTED_SIZE 131072
>>> >> > +
>>> >> > +/*
>>> >> > + * Default maximum number of RDMA read/write outstanding on this
>>> >> > +connection
>>> >> > + * This value is possibly decreased during QP creation on hardware
>>> >> > +limit */
>>> >> > +#define SMBD_CM_RESPONDER_RESOURCES 32
>>> >> > +
>>> >> > +/* Maximum number of retries on data transfer operations */
>>> >> > +#define SMBD_CM_RETRY 6
>>> >> > +/* No need to retry on Receiver Not Ready since SMBD manages
>>> >> > +credits
>>> >> */
>>> >> > +#define SMBD_CM_RNR_RETRY 0
>>> >> > +
>>> >> > +/*
>>> >> > + * User configurable initial values per SMBD transport connection
>>> >> > + * as defined in [MS-SMBD] 3.1.1.1
>>> >> > + * Those may change after a SMBD negotiation */
>>> >>
>>> >> Since these value are per transport connection, why they are global?
>>> >> Shouldn't they be inside a some structure that is created for a
>>> >> particular connection? Also the constants below should be defines.
>>> >
>>> > Those are configurable initial values (default values) for all connections.
>>> >
>>> > Each connection has its own values based on those initial values. But
>>> connection-based values can change after negotiation is done, or after
>>> RDMA hardware capabilities are probed.
>>>
>>> If these are configurable values, let's add a way to actually configure them.
>>> Through /proc?
>>
>> You mean putting them in /proc/fs/cifs?
>>
>> Or how about module_param?
>
> I am ok with either way. If it is safe to change them without
> reloading the module let's do /proc/fs/cifs which would make it easier
> to use. Otherwise - module_param is also good.
>
> --
> Best regards,
> Pavel Shilovsky
>



--
Thanks,

Steve

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