Re: [Qemu-devel] [PATCH 00/10] rocker: add new rocker ethernet switch device

[Stefan Hajnoczi]

On Mon, Dec 29, 2014 at 09:14:01PM -0800, address@hidden wrote:
> From: Scott Feldman <address@hidden>
> 
> [This is a collaboration between myself and Jiri Pirko].
> 
> This patch set adds a new ethernet switch device, called rocker.  Rocker is
> intended to emulate HW features of switch ASICs found in today's
> data-center-class switch/routers.  The original motivation in creating a new
> device is to accelerate device driver development for ethernet switches in the
> Linux kernel.  A device driver for rocker already exists in the Linux 3.18
> kernel and loads against this device.  Basic L2 switching (bridging)
> functionality is offloaded to the device.  Work continues to enable offloading
> of L3 routing functions and ACLs, as well as support for a flow-based modes,
> such as OpenVSwitch with OpenFlow.  Future support for terminating L2-over-L3
> tunnels is also planned.
> 
> The core network processing functions are based on the spec of a real device:
> Broadcom's OF-DPA.  Specifically, rocker borrows OF-DPA's network processing
> pipeline comprised of flow match and action tables.  Only the OF-DPA spec was
> used in constructing rocker.  The rocker developers do not have access to the
> real OF-DPA's software source code, so this is a clean-room, ground-up
> development.
> 
> Each rocker device is a PCI device with a memory-mapped register space and
> MSI-X interrupts for command and event processing, as well as CPU-bound I/O.
> Each device can support up to 62 "front-panel" ports, which present themselves
> as -netdev attachment points.  The device is programmed using OF-DPA flow and
> group tables to setup the flow pipeline.  The programming defines the
> forwarding path for packets ingressing on 'front-panel' ports.  The forwarding
> path can look at L2/L3/L4 packet header to forward the packet to its
> destination.  For the performance path, packets would ingress and egress only
> on the device, and not be passed up to the device driver (or host OS).  The
> slow path for control packets will forward packets to the CPU via the device
> driver for host OS processing.
> 
> A QMP/HMP interface is added to give inside into the device's internal port
> configuration and flow/group tables.
> 
> A test directory is included with some basic sanity tests to verify the device
> and driver.
> 
> Scott Feldman (10):
>   pci: move REDHAT_SDHCI device ID to make room for Rocker
>   net: add MAC address string printer
>   virtio-net: use qemu_mac_strdup_printf
>   rocker: add register programming guide
>   pci: add rocker device ID
>   pci: add network device class 'other' for network switches
>   rocker: add new rocker switch device
>   qmp: add rocker device support
>   rocker: add tests
>   MAINTAINERS: add rocker
> 
>  MAINTAINERS                        |    6 +
>  default-configs/pci.mak            |    1 +
>  docs/specs/pci-ids.txt             |    3 +-
>  hmp-commands.hx                    |   56 +
>  hmp.c                              |  303 +++++
>  hmp.h                              |    4 +
>  hw/net/Makefile.objs               |    3 +
>  hw/net/rocker/reg_guide.txt        |  957 +++++++++++++
>  hw/net/rocker/rocker.c             | 1440 ++++++++++++++++++++
>  hw/net/rocker/rocker.h             |   76 ++
>  hw/net/rocker/rocker_desc.c        |  379 ++++++
>  hw/net/rocker/rocker_desc.h        |   57 +
>  hw/net/rocker/rocker_fp.c          |  243 ++++
>  hw/net/rocker/rocker_fp.h          |   54 +
>  hw/net/rocker/rocker_hw.h          |  475 +++++++
>  hw/net/rocker/rocker_of_dpa.c      | 2644 
> ++++++++++++++++++++++++++++++++++++
>  hw/net/rocker/rocker_of_dpa.h      |   25 +
>  hw/net/rocker/rocker_tlv.h         |  247 ++++
>  hw/net/rocker/rocker_world.c       |  108 ++
>  hw/net/rocker/rocker_world.h       |   63 +
>  hw/net/rocker/test/README          |    5 +
>  hw/net/rocker/test/all             |   19 +
>  hw/net/rocker/test/bridge          |   43 +
>  hw/net/rocker/test/bridge-stp      |   52 +
>  hw/net/rocker/test/bridge-vlan     |   52 +
>  hw/net/rocker/test/bridge-vlan-stp |   64 +
>  hw/net/rocker/test/port            |   22 +
>  hw/net/rocker/test/tut.dot         |    8 +
>  hw/net/virtio-net.c                |   12 +-
>  include/hw/pci/pci.h               |    3 +-
>  include/hw/pci/pci_ids.h           |    1 +
>  include/net/net.h                  |    1 +
>  net/net.c                          |    7 +
>  qapi-schema.json                   |   51 +
>  qmp-commands.hx                    |   24 +
>  35 files changed, 7497 insertions(+), 11 deletions(-)
>  create mode 100644 hw/net/rocker/reg_guide.txt
>  create mode 100644 hw/net/rocker/rocker.c
>  create mode 100644 hw/net/rocker/rocker.h
>  create mode 100644 hw/net/rocker/rocker_desc.c
>  create mode 100644 hw/net/rocker/rocker_desc.h
>  create mode 100644 hw/net/rocker/rocker_fp.c
>  create mode 100644 hw/net/rocker/rocker_fp.h
>  create mode 100644 hw/net/rocker/rocker_hw.h
>  create mode 100644 hw/net/rocker/rocker_of_dpa.c
>  create mode 100644 hw/net/rocker/rocker_of_dpa.h
>  create mode 100644 hw/net/rocker/rocker_tlv.h
>  create mode 100644 hw/net/rocker/rocker_world.c
>  create mode 100644 hw/net/rocker/rocker_world.h
>  create mode 100644 hw/net/rocker/test/README
>  create mode 100755 hw/net/rocker/test/all
>  create mode 100755 hw/net/rocker/test/bridge
>  create mode 100755 hw/net/rocker/test/bridge-stp
>  create mode 100755 hw/net/rocker/test/bridge-vlan
>  create mode 100755 hw/net/rocker/test/bridge-vlan-stp
>  create mode 100755 hw/net/rocker/test/port
>  create mode 100644 hw/net/rocker/test/tut.dot

CCing Jason Wang, who may also be interested in reviewing this series.

Stefan

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