Re: [PATCH v4 00/15] Switchtec NTB Support

[Logan Gunthorpe]

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