From: Logan Gunthorpe <logang@deltatee.com>
To: Jon Mason <jdmason@kudzu.us>
Cc: linux-ntb@googlegroups.com, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, Dave Jiang <dave.jiang@intel.com>,
        Allen Hubbe <Allen.Hubbe@emc.com>, Bjorn Helgaas <bhelgaas@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Kurt Schwemmer <kurt.schwemmer@microsemi.com>,
        Stephen Bates <sbates@raithlin.com>,
        Serge Semin <fancer.lancer@gmail.com>
References: <20170803181954.4154-1-logang@deltatee.com>
 <58ab6a33-4de5-8fd8-65c2-079f6f6301c4@deltatee.com>
Message-ID: <50ba7618-b5c3-1779-ad79-0f32254ebbaf@deltatee.com>
Date: Wed, 30 Aug 2017 13:18:28 -0600
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Subject: Re: [PATCH v4 00/15] Switchtec NTB Support
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Hey Jon,

Any update on this? The merge window is likely very soon and it would be 
good to know where we stand. As far as I know I've addressed all the 
feedback I've been given. Let me know if there's anything I can do to 
further this process.

Thanks,

Logan

On 22/08/17 10:59 AM, Logan Gunthorpe wrote:
> Hi,
> 
> Just wanted to give this a poke as I haven't received any feedback in a 
> couple weeks on v4. What are people's thoughts on this? Is it suitable 
> to make it into the next merge window?
> 
> Thanks,
> 
> Logan
> 
> 
> On 03/08/17 12:19 PM, Logan Gunthorpe wrote:
>> Changes since v3:
>>
>> - Rebased onto the Jon's ntb branch that contains one of the patches
>>    that was in v3
>> - Various spelling and commit log mistakes noticed by Bjorn
>> - Renamed switchtec_ntb to ntb_hw_switchtec per Dave's suggestion
>> - Fixed a number of code nits pointed out by Jon
>>
>> -- 
>>
>> Changes since v2:
>>
>> - Reordered the ntb_test link patch per Allen
>> - Removed an extra call to switchtec_ntb_init_mw
>> - Fixed a typo in the switchtec.txt documentation.
>>
>> -- 
>>
>> Changes since v1:
>>
>> - Rebased onto latest ntb-next branch (with v4.13-rc1)
>> - Reworked ntb_mw_count() function so that it can be called all the
>>    time (per discussion with Allen)
>> - Various spelling and formatting cleanups from Bjorn
>> - Added request_module() call such that the NTB module is automatically
>>    loaded when appropriate hardware exists.
>>
>> -- 
>>
>> Changes since the rfc:
>>
>> - Rebased on ntb-next
>> - Switched ntb_part_op to use sleep instead of delay
>> - Dropped a number of useless dbg __func__ prints
>> - Went back to the dynamic instead of the static class
>> - Swapped the notifier block for a simple callback
>> - Modified the new ntb api so that a couple functions with pidx
>>    now must be called after link up. Per our discussion on the list.
>>
>> -- 
>>
>> This patchset implements Non-Transparent Bridge (NTB) support for the
>> Microsemi Switchtec series of switches. We're looking for some
>> review from the community at this point but hope to get it upstreamed
>> for v4.14.
>>
>> Switchtec NTB support is configured over the same function and bar
>> as the management endpoint. Thus, the new driver hooks into the
>> management driver which we had merged in v4.12. We use the class
>> interface API to register an NTB device for every switchtec device
>> which supports NTB (not all do).
>>
>> The Switchtec hardware supports doorbells, memory windows and messages.
>> Seeing there is no native scratchpad support, 128 spads are emulated
>> through the use of a pre-setup memory window. The switch has 64
>> doorbells which are shared between the two partitions and a
>> configurable set of memory windows. While the hardware supports more
>> than 2 partitions, this driver only supports the first two seeing
>> the current NTB API only supports two hosts.
>>
>> The driver has been tested with ntb_netdev and fully passes the
>> ntb_test script.
>>
>> This patchset is based off of ntb-next and can be found in this
>> git repo:
>>
>> https://github.com/sbates130272/linux-p2pmem.git switchtec_ntb_v4
>>
>> Logan Gunthorpe (15):
>>    NTB: switchtec: Move structure definitions into a common header
>>    NTB: switchtec: Export class symbol for use in upper layer driver
>>    NTB: switchtec: Add NTB hardware register definitions
>>    NTB: switchtec: Add link event notifier callback
>>    NTB: Ensure ntb_mw_get_align() is only called when the link is up
>>    NTB: Add check and comment for link up to mw_count() and
>>      mw_get_align()
>>    NTB: switchtec_ntb: Introduce initial NTB driver
>>    NTB: switchtec_ntb: Initialize hardware for memory windows
>>    NTB: switchtec_ntb: Initialize hardware for doorbells and messages
>>    NTB: switchtec_ntb: Add skeleton NTB driver
>>    NTB: switchtec_ntb: Add link management
>>    NTB: switchtec_ntb: Implement doorbell registers
>>    NTB: switchtec_ntb: Implement scratchpad registers
>>    NTB: switchtec_ntb: Add memory window support
>>    NTB: switchtec_ntb: Update switchtec documentation with notes for NTB
>>
>>   Documentation/switchtec.txt            |   12 +
>>   MAINTAINERS                            |    2 +
>>   drivers/ntb/hw/Kconfig                 |    1 +
>>   drivers/ntb/hw/Makefile                |    1 +
>>   drivers/ntb/hw/mscc/Kconfig            |    9 +
>>   drivers/ntb/hw/mscc/Makefile           |    1 +
>>   drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 1216 
>> ++++++++++++++++++++++++++++++++
>>   drivers/ntb/ntb_transport.c            |   20 +-
>>   drivers/ntb/test/ntb_perf.c            |   18 +-
>>   drivers/ntb/test/ntb_tool.c            |    6 +-
>>   drivers/pci/switch/switchtec.c         |  316 ++-------
>>   include/linux/ntb.h                    |   11 +-
>>   include/linux/switchtec.h              |  373 ++++++++++
>>   13 files changed, 1703 insertions(+), 283 deletions(-)
>>   create mode 100644 drivers/ntb/hw/mscc/Kconfig
>>   create mode 100644 drivers/ntb/hw/mscc/Makefile
>>   create mode 100644 drivers/ntb/hw/mscc/ntb_hw_switchtec.c
>>   create mode 100644 include/linux/switchtec.h
>>
>> -- 
>> 2.11.0
>>