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[Xen-devel] [PATCH for-4.5 v21 00/14] Remus/Libxl: Remus network buffering and drbd disk

This patch series adds support for network buffering and drbd disk
in the Remus codebase in libxl.

the code is also hosted on github:
url: https://github.com/macrosheep/xen/tree/remus-v21

Changes in v21:
  Correct use of multidev (by IanJ)
  Use existing libxl__device_kind (by IanJ)
  unsafe->allow_unsafe (by IanJ)

Changes in v20:

Changes in v19:
  Use defbool for cmdline switch.
  Restruct of subkind init and cleanup operation.
  Use libxl__device_kind instead of libxl__remus_device_kind
  Fix a layer violation issue pointed out by IanJ.
  Other minor fixes.
  Rebased to the latest staging tree.

Changes in v18:
  Merge match() and setup() api.
  Reuse libxl__multidev and libxl__ao_device.
  Commit messages and code comments improved. Thanks to Shriram.

Changes in v17:
  Make remus device abstract layer more generic.
  Addressed Ian J's comments.

Changes in v16:
  Merge libxl__remus_state and libxl__remus_device_state.
  Pass the ops to device abstract layer instead of defined it in the layer.
  Optimized subkind ops APIs.
  Addressed Ian J's comments.

Changes in v15:
  The first patch in v14 has been taken, so remove it from the patchset.
  Add a patch to Update maintained files of REMUS.

Changes in v14:
  Addressed IanJ's comments.

Changes in v13:
  Addressed Konrad's comments.

Changes in v12:
  Add disk buffering cmdline switch.

Changes in v11:
  Addressed comments from Ian J and Shriram.
  Add drbd disk implement into this patch series.

Changes in V10:
  Restructured the whole patch series.
  Introduce the remus device abstract layer.
  Make remus checkpoint asynchronous.

Changes in V9:
  Use async exec script api to exec scripts.

Changes in V8:
  Applied some comments(by IanJ).
  Merge some struct definitions to it's implementation.
  (2/3/5 in V7 => 3 in V8)

Changes in V7:
  Applied missing comments(by IanJ).
  Applied Shriram comments.

  merge netbufering tangled setup/teardown code into one patch.
  (2/6/8 in V6 => 5 in V7. 9/10 in V6 => 7 in V7)

Changes in V6:
  Applied Ian Jackson's comments of V5 series.
  the [PATCH 2/4 V5] is split by small functionalities.

  [PATCH 4/4 V5] --> [PATCH 13/13] netbuffer is default enabled.

Changes in V5:

Merge hotplug script patch (2/5) and hotplug script setup/teardown
patch (3/5) into a single patch.

Changes in V4:

[1/5] Remove check for libnl command line utils in autoconf checks

[2/5] minor nits

[3/5] define LIBXL_HAVE_REMUS_NETBUF in libxl.h

[4/5] clean ups. Make the usleep in checkpoint callback asynchronous

[5/5] minor nits

Changes in V3:
[1/5] Fix redundant checks in configure scripts
      (based on Ian Campbell's suggestions)

[2/5] Introduce locking in the script, during IFB setup.
      Add xenstore paths used by netbuf scripts
      to xenstore-paths.markdown

[3/5] Hotplug scripts setup/teardown invocations are now asynchronous
      following IanJ's feedback.  However, the invocations are still

[5/5] Allow per-domain specification of netbuffer scripts in xl remus

And minor nits throughout the series based on feedback from
the last version

Changes in V2:
[1/5] Configure script will automatically enable/disable network
      buffer support depending on the availability of the appropriate
      libnl3 version. [If libnl3 is unavailable, a warning message will be
      printed to let the user know that the feature has been disabled.]

      use macros from pkg.m4 instead of pkg-config commands
      removed redundant checks for libnl3 libraries.

[3,4/5] - Minor nits.

Version 1:

[1/5] Changes to autoconf scripts to check for libnl3. Add linker flags
      to libxl Makefile.

[2/5] External script to setup/teardown network buffering using libnl3's
      CLI. This script will be invoked by libxl before starting Remus.
      The script's main job is to bring up an IFB device with plug qdisc
      attached to it.  It then re-routes egress traffic from the guest's
      vif to the IFB device.

[3/5] Libxl code to invoke the external setup script, followed by netlink
      related setup to obtain a handle on the output buffers attached
      to each vif.

[4/5] Libxl interaction with network buffer module in the kernel via
      libnl3 API.

[5/5] xl cmdline switch to explicitly enable network buffering when
      starting remus.

  Few things to note(by shriram): 

    a) Based on previous email discussions, the setup/teardown task has
    been moved to a hotplug style shell script which can be customized as
    desired, instead of implementing it as C code inside libxl.

    b) Libnl3 is not available on NetBSD. Nor is it available on CentOS
   (Linux).  So I have made network buffering support an optional feature
   so that it can be disabled if desired.

   c) NetBSD does not have libnl3. So I have put the setup script under
   tools/hotplug/Linux folder.


Ian Jackson (2):
  libxl: multidev: Clarify comments about which callbacks are meant
  libxl: multidev: Expose libxl__multidev_one_callback

Yang Hongyang (12):
  libxl: introduce libxl__multidev_prepare_with_aodev
  libxl: Extend libxl__ao_device with a libxl__ev_child member
  autoconf: add libnl3 dependency for Remus network buffering support
  libxl/remus: introduce an abstract Remus device layer
  libxl/remus: setup and control network output buffering
  libxl/remus: setup and control disk replication for DRBD backends
  xl/remus: change bool to defbool
  xl/remus: cmdline switch to explicitly enable unsafe configurations
  xl/remus: cmdline switches and config vars to control network
  xl/remus: add a cmdline switch to disable disk replication
  libxl/remus: add LIBXL_HAVE_REMUS to indicate Remus support in libxl
  MAINTAINERS: update maintained files of Remus

 MAINTAINERS                            |   7 +
 README                                 |   4 +
 config/Tools.mk.in                     |   4 +
 docs/README.remus                      |  16 +
 docs/man/xl.conf.pod.5                 |   6 +
 docs/man/xl.pod.1                      |  30 +-
 docs/misc/xenstore-paths.markdown      |   4 +
 tools/configure.ac                     |  16 +
 tools/hotplug/Linux/Makefile           |   2 +
 tools/hotplug/Linux/block-drbd-probe   |  87 ++++++
 tools/hotplug/Linux/remus-netbuf-setup | 230 +++++++++++++++
 tools/libxl/Makefile                   |  15 +
 tools/libxl/libxl.c                    |  74 ++++-
 tools/libxl/libxl.h                    |   6 +
 tools/libxl/libxl_device.c             |  22 +-
 tools/libxl/libxl_dom.c                | 170 ++++++++++-
 tools/libxl/libxl_internal.h           | 211 +++++++++++++-
 tools/libxl/libxl_netbuffer.c          | 517 +++++++++++++++++++++++++++++++++
 tools/libxl/libxl_nonetbuffer.c        |  54 ++++
 tools/libxl/libxl_remus_device.c       | 327 +++++++++++++++++++++
 tools/libxl/libxl_remus_disk_drbd.c    | 258 ++++++++++++++++
 tools/libxl/libxl_types.idl            |  10 +-
 tools/libxl/xl.c                       |   4 +
 tools/libxl/xl.h                       |   1 +
 tools/libxl/xl_cmdimpl.c               |  42 ++-
 tools/libxl/xl_cmdtable.c              |  11 +-
 26 files changed, 2076 insertions(+), 52 deletions(-)
 create mode 100755 tools/hotplug/Linux/block-drbd-probe
 create mode 100644 tools/hotplug/Linux/remus-netbuf-setup
 create mode 100644 tools/libxl/libxl_netbuffer.c
 create mode 100644 tools/libxl/libxl_nonetbuffer.c
 create mode 100644 tools/libxl/libxl_remus_device.c
 create mode 100644 tools/libxl/libxl_remus_disk_drbd.c


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