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Libvirt native C API and daemons
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Dmytro Linkin 5b1c525b1f util: Add phys_port_name support on virPCIGetNetName
virPCIGetNetName is used to get the name of the netdev associated with
a particular PCI device. This is used when we have a VF name, but need
the PF name in order to send a netlink command (e.g. in order to
get/set the MAC address of the VF).

In simple cases there is a single netdev associated with any PCI
device, so it is easy to figure out the PF netdev for a VF - just look
for the PCI device that has the VF listed in its "virtfns" directory;
the only name in the "net" subdirectory of that PCI device's sysfs
directory is the PF netdev that is upstream of the VF in question.

In some cases there can be more than one netdev in a PCI device's net
directory though. In the past, the only case of this was for SR-IOV
NICs that could have multiple PF's per PCI device. In this case, all
PF netdevs associated with a PCI address would be listed in the "net"
subdirectory of the PCI device's directory in sysfs. At the same time,
all VF netdevs and all PF netdevs have a phys_port_id in their sysfs,
so the way to learn the correct PF netdev for a particular VF netdev
is to search through the list of devices in the net subdirectory of
the PF's PCI device, looking for the one netdev with a "phys_port_id"
matching that of the VF netdev.

But starting in kernel 5.8, the NVIDIA Mellanox driver began linking
the VFs' representor netdevs to the PF PCI address [1], and so the VF
representor netdevs would also show up in the net
subdirectory. However, all of the devices that do so also only have a
single PF netdev for any given PCI address.

This means that the net directory of the PCI device can still hold
multiple net devices, but only one of them will be the PF netdev (the
others are VF representors):

$ ls '/sys/bus/pci/devices/0000:82:00.0/net'
ens1f0  eth0  eth1

In this case the way to find the PF device is to look at the
"phys_port_name" attribute of each netdev in sysfs. All PF devices
have a phys_port_name matching a particular regex

  (p[0-9]+$)|(p[0-9]+s[0-9]+$)

Since there can only be one PF in the entire list of devices, once we
match that regex, we've found the PF netdev.

[1] - https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/
      commit/?id=123f0f53dd64b67e34142485fe866a8a581f12f1

Co-Authored-by: Moshe Levi <moshele@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Adrian Chiris <adrianc@nvidia.com>
Reviewed-by: Laine Stump <laine@redhat.com>
2021-01-25 20:28:18 -05:00
.ctags.d maint: Add support for .ctags.d 2019-05-31 17:54:28 +02:00
.github github: skip lockdown of old issues/prs 2020-04-07 17:50:54 +01:00
.gitlab/issue_templates gitlab: Add issue template for a feature request 2020-12-02 09:11:27 +01:00
build-aux syntax-check: Don't forbid curly braces around single line condition body 2020-09-15 15:20:23 +02:00
ci ci: Drop openSUSE Leap 15.1 2021-01-20 11:20:26 +01:00
docs docs: formatdomain: Fix poll-control XML example 2021-01-24 18:40:17 -05:00
examples libvirt: support memory failure event 2020-10-23 09:41:52 +02:00
include hyperv: ambiguous VM names will throw an error 2021-01-21 10:18:21 +01:00
po util: move virStorageEncryption code into conf 2021-01-22 11:10:27 +01:00
scripts hyperv: enable use of g_autoptr for the rest of the CIM/WMI classes 2021-01-22 14:04:24 -05:00
src util: Add phys_port_name support on virPCIGetNetName 2021-01-25 20:28:18 -05:00
tests storage_source: use virStorageSource prefix for all functions 2021-01-22 11:10:27 +01:00
tools virsh: Fix XPATH in virshDomainDeviceAliasCompleter() 2021-01-22 10:45:54 +01:00
.color_coded.in gnulib: delete all gnulib integration 2020-02-07 15:03:54 +00:00
.ctags ctags: Generate tags for headers, i.e. function prototypes 2018-09-18 14:21:33 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
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.gitignore Ignore clangd-related files and folders 2020-08-03 10:57:47 +02:00
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.mailmap mailmap: consolidate my email addresses 2020-10-06 12:05:09 +02:00
.ycm_extra_conf.py.in gnulib: delete all gnulib integration 2020-02-07 15:03:54 +00:00
AUTHORS.rst.in AUTHORS: Remove Emacs file variables 2020-09-02 13:20:17 +02:00
config.h Fix capitalization "CLang" -> "Clang" 2020-11-12 15:01:42 +01:00
configmake.h.in meson: generate configmake.h 2020-08-03 09:26:48 +02:00
CONTRIBUTING.rst meson: adjust our documentation to mention meson instead of autoconf 2020-08-03 09:27:09 +02:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: Remove control characters from LGPL license file 2015-09-25 09:16:24 +02:00
gitdm.config gitdm: add 'ibm' file 2019-10-18 17:32:52 +02:00
libvirt-admin.pc.in Add libvirt-admin library 2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.spec.in spec: Increase meson test timeout 10x 2021-01-24 13:28:18 -05:00
meson_options.txt meson: add tests build option to enable/disable unit tests 2020-10-09 13:44:54 +02:00
meson.build meson: build vstorage only on linux 2021-01-19 20:25:42 +03:00
mingw-libvirt.spec.in rpm: convert mingw spec to meson 2020-12-07 12:24:32 +00:00
NEWS.rst NEWS: Document virtio-pmem model 2021-01-21 15:41:51 +01:00
README.rst README: drop Travis CI badge 2020-08-03 15:08:28 +02:00
run.in Prefer https: everywhere where possible 2020-09-01 21:58:46 +02:00

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==============================
Libvirt API for virtualization
==============================

Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.

For some of these hypervisors, it provides a stateful management
daemon which runs on the virtualization host allowing access to the
API both by non-privileged local users and remote users.

Layered packages provide bindings of the libvirt C API into other
languages including Python, Perl, PHP, Go, Java, OCaml, as well as
mappings into object systems such as GObject, CIM and SNMP.

Further information about the libvirt project can be found on the
website:

https://libvirt.org


License
=======

The libvirt C API is distributed under the terms of GNU Lesser General
Public License, version 2.1 (or later). Some parts of the code that are
not part of the C library may have the more restrictive GNU General
Public License, version 2.0 (or later). See the files ``COPYING.LESSER``
and ``COPYING`` for full license terms & conditions.


Installation
============

Instructions on building and installing libvirt can be found on the website:

https://libvirt.org/compiling.html

Contributing
============

The libvirt project welcomes contributions in many ways. For most components
the best way to contribute is to send patches to the primary development
mailing list. Further guidance on this can be found on the website:

https://libvirt.org/contribute.html


Contact
=======

The libvirt project has two primary mailing lists:

* libvirt-users@redhat.com (**for user discussions**)
* libvir-list@redhat.com (**for development only**)

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html