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SubjectRE: [PATCH v3 00/16] Switchtec NTB Support
Date
From: Logan Gunthorpe
> 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.

Patches 5..16 (also 5 [was 6], and 14, objections notwithstanding):

Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>

> --
>
> 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_v3
>
> *** BLURB HERE ***
>
> Logan Gunthorpe (16):
> switchtec: move structure definitions into a common header
> switchtec: export class symbol for use in upper layer driver
> switchtec: add NTB hardware register definitions
> switchtec: add link event notifier callback
> ntb: ntb_test: ensure the link is up before trying to configure the
> mws
> 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()
> switchtec_ntb: introduce initial NTB driver
> switchtec_ntb: initialize hardware for memory windows
> switchtec_ntb: initialize hardware for doorbells and messages
> switchtec_ntb: add skeleton NTB driver
> switchtec_ntb: add link management
> switchtec_ntb: implement doorbell registers
> switchtec_ntb: implement scratchpad registers
> switchtec_ntb: add memory window support
> 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/switchtec_ntb.c | 1211 +++++++++++++++++++++++++++++++
> 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 ++++++++++
> tools/testing/selftests/ntb/ntb_test.sh | 4 +
> 14 files changed, 1702 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/switchtec_ntb.c
> create mode 100644 include/linux/switchtec.h
>
> --
> 2.11.0

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