Hi, 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 v4.12-rc5 and can be found in this git repo: https://github.com/sbates130272/linux-p2pmem.git switchtec_ntb Thanks, Logan Logan Gunthorpe (13): 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 block 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 | 1144 +++++++++++++++++++++++++++++++++++ drivers/pci/switch/switchtec.c | 319 ++-------- include/linux/ntb.h | 3 + include/linux/switchtec.h | 365 +++++++++++ 10 files changed, 1601 insertions(+), 256 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
