[ovs-dev] [PATCH v3 0/3] vhost-user: Add the ability to control ownership/permissions

[Aaron Conole]

Currently, when using Open vSwitch with DPDK and qemu guests, the recommended
method for joining the guests is via the dpdkvhostuser interface. This
interface uses Unix Domain sockets to communicate. When these sockets are
created, they inherit the permissions and ownership from the vswitchd process.
This can lead to an undesirable state where the QEMU process cannot use the
socket file until manual intervention is performed (via `chown` and/or `chmod`
calls).

This patchset gives the ability to set the permissions and ownership of all
dpdkvhostuser sockets from the database, avoiding the manual intervention
required to connect QEMU and OVS via DPDK.

The first patch adds chmod and chown calls to lib, with unit tests. The
second patch hooks those calls into the netdev_dpdk_vhost_user_construct
function, after the socket is created.

Changes from v2:
* Added a new 2nd patch to series for chmod/chown on already opened files.
  There exist known implementations for other systems, including FreeBSD, but
  only linux is implemented.  ENOTSUP is set when these calls fail on non-linux
  systems.

Aaron Conole (3):
  chutil: introduce a new change-utils lib
  lib/chutil: Add chmod and chown for opened files
  netdev-dpdk: Support user-defined socket attribs

 INSTALL.DPDK.md      |   7 +
 lib/automake.mk      |   2 +
 lib/chutil-unix.c    | 455 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/chutil.h         |  36 ++++
 lib/daemon-unix.c    | 149 +----------------
 lib/netdev-dpdk.c    |  37 ++++-
 tests/automake.mk    |   2 +
 tests/library.at     |   5 +
 tests/test-chutil.c  | 249 ++++++++++++++++++++++++++++
 vswitchd/vswitch.xml |  23 +++
 10 files changed, 818 insertions(+), 147 deletions(-)
 create mode 100644 lib/chutil-unix.c
 create mode 100644 lib/chutil.h
 create mode 100644 tests/test-chutil.c

-- 
2.5.5