aboutsummaryrefslogtreecommitdiffstats
path: root/docs/report/vpp_device_tests/test_environment.rst
blob: 2d07586102fd990dbbcfdb9b1ba655c298c67ec1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
Integration Tests
=================

Abstract
--------

FD.io VPP software data plane technology has become very popular across
a wide range of VPP eco-system use cases, putting higher pressure on
continuous verification of VPP software quality.

This document describes a proposal for design and implementation of extended
continuous VPP testing by extending existing test environments.
Furthermore it describes and summarizes implementation details of Integration
and System tests platform *1-Node VPP_Device*. It aims to provide a complete
end-to-end view of *1-Node VPP_Device* environment in order to improve
extendability and maintenance, under the guideline of VPP core team.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this document are to be
interpreted as described in :rfc:`8174`.

Overview
--------

.. only:: latex

    .. raw:: latex

        \begin{figure}[H]
            \centering
                \graphicspath{{../_tmp/src/vpp_device_tests/}}
                \includegraphics[width=0.90\textwidth]{vpp_device}
                \label{fig:vpp_device}
        \end{figure}

.. only:: html

    .. figure:: vpp_device.svg
        :alt: vpp_device
        :align: center

Physical Testbeds
-----------------

All :abbr:`FD.io (Fast Data Input/Ouput)` :abbr:`CSIT (Continuous System
Integration and Testing)` vpp-device tests are executed on physical testbeds
built with bare-metal servers hosted by :abbr:`LF (Linux Foundation)` FD.io
project. Two 1-node testbed topologies are used:

- **2-Container Topology**: Consisting of one Docker container acting as SUT
  (System Under Test) and one Docker container as TG (Traffic Generator), both
  connected in ring topology via physical NIC cross-connecting.

Current FD.io production testbeds are built with servers based on one
processor generation of Intel Xeons: Skylake (Platinum 8180). Testbeds built
with servers based on Arm processors are in the process of being added to FD.io
production.

Following section describe existing production 1n-skx testbed.

1-Node Xeon Skylake (1n-skx)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1n-skx testbed is based on single SuperMicro SYS-7049GP-TRT server equipped with
two Intel Xeon Skylake Platinum 8180 2.5 GHz 28 core processors. Physical
testbed topology is depicted in a figure below.

.. only:: latex

    .. raw:: latex

        \begin{figure}[H]
            \centering
                \graphicspath{{../_tmp/src/vpp_device_tests/}}
                \includegraphics[width=0.90\textwidth]{vf-2n-nic2nic}
                \label{fig:vf-2n-nic2nic}
        \end{figure}

.. only:: html

    .. figure:: vf-2n-nic2nic.svg
        :alt: vf-2n-nic2nic
        :align: center

Server is populated with the following NIC models:

#. NIC-1: x710-da4 4p10GE Intel.
#. NIC-2: x710-da4 4p10GE Intel.

All Intel Xeon Skylake servers run with Intel Hyper-Threading enabled,
doubling the number of logical cores exposed to Linux, with 56 logical
cores and 28 physical cores per processor socket.

NIC interfaces are shared using Linux vfio_pci and VPP VF drivers:

- DPDK VF driver,
- Fortville AVF driver.

Provided Intel x710-da4 4p10GE NICs support 32 VFs per interface, 128 per NIC.

Complete 1n-skx testbeds specification is available on `CSIT LF Testbeds
<https://wiki.fd.io/view/CSIT/Testbeds:_Xeon_Skx,_Arm,_Atom.>`_ wiki page.

Total of two 1n-skx testbeds are in operation in FD.io labs.

1-Node Virtualbox (1n-vbox)
~~~~~~~~~~~~~~~~~~~~~~~~~~~

1n-skx testbed can run in single VirtualBox VM machine. This solution replaces
the previously used Vagrant environment based on 3 VMs.

VirtualBox VM MAY be created by Vagrant and MUST have additional 4 virtio NICs
each pair attached to separate private networks to simulate back-to-back
connections. It SHOULD be 82545EM device model (otherwise can be changed in
boostrap scripts). Example of Vagrant configuration:

::

    Vagrant.configure(2) do |c|
      c.vm.network "private_network", type: "dhcp", auto_config: false,
          virtualbox__intnet: "port1", nic_type: "82545EM"
      c.vm.network "private_network", type: "dhcp", auto_config: false,
          virtualbox__intnet: "port2", nic_type: "82545EM"

      c.vm.provider :virtualbox do |v|
        v.customize ["modifyvm", :id, "--nicpromisc2", "allow-all"]
        v.customize ["modifyvm", :id, "--nicpromisc3", "allow-all"]
        v.customize ["modifyvm", :id, "--nicpromisc4", "allow-all"]
        v.customize ["modifyvm", :id, "--nicpromisc5", "allow-all"]

Vagrant VM is populated with the following NIC models:

#. NIC-1: 82545EM Intel.
#. NIC-2: 82545EM Intel.
#. NIC-3: 82545EM Intel.
#. NIC-4: 82545EM Intel.

Containers
----------

It was agreed on :abbr:`TWS (Technical Work Stream)` call to continue with
Ubuntu 18.04 LTS as a baseline system with OPTIONAL extend to Centos 7 and
SuSE per demand [TWSLink]_.

All :abbr:`DCR (Docker container)` images are REQUIRED to be hosted on Docker
registry available from LF network, publicly available and trackable. For
backup, tracking and contributing purposes all Dockerfiles (including files
needed for building container) MUST be available and stored in [fdiocsitgerrit]_
repository under appropriate folders. This allows the peer review process to be
done for every change of infrastructure related to scope of this document.
Currently only **csit-shim-dcr** and **csit-sut-dcr** containers will be stored
and maintained under CSIT repository by CSIT contributors.

At the time of designing solution described in this document the interconnection
between [dockerhub]_ and  [fdiocsitgerrit]_ for automated build purposes and
image hosting cannot be established with the trust and respectful to
security of FD.io project. Unless adressed, :abbr:`DCR` images will be placed in
custom registry service [fdioregistry]_. Automated Jenkins jobs will be created
in align of long term solution for container lifecycle and ability to build
new version of docker images.

In parallel, the effort is started to find the outsourced Docker registry
service.

Versioning
~~~~~~~~~~

As of initial version of vpp-device, we do have only single latest version of
Docker image hosted on [dockerhub]_. This will be addressed as further
improvement with proper semantic versioning.

jenkins-slave-dcr
~~~~~~~~~~~~~~~~~

This :abbr:`DCR` acts as the Jenkins slave (known also as jenkins minion). It
can connect over SSH protocol to TCP port 6022 of **csit-shim-dcr** and executes
non-interactive reservation script. Nomad is responsible for scheduling this
container execution onto specific **1-Node VPP_Device** testbed. It executes
:abbr:`CSIT` environment including :abbr:`CSIT` framework.

All software dependencies including VPP/DPDK that are not present in
**csit-sut-dcr** container image and/or needs to be compiled prior running on
**csit-sut-dcr** SHOULD be compiled in this container.

- *Container Image Location*: Docker image at snergster/vpp-ubuntu18.

- *Container Definition*: Docker file specified at [JenkinsSlaveDcrFile]_.

- *Initializing*: Container is initialized from within *Consul by HashiCorp*
  and *Nomad by HashiCorp*.

csit-shim-dcr
~~~~~~~~~~~~~

This :abbr:`DCR` acts as an intermediate layer running script responsible for
orchestrating topologies under test and reservation. Responsible for managing VF
resources and allocation to :abbr:`DUT (Device Under Test)`, :abbr:`TG
(Traffic Generator)` containers. This MUST to be done on **csit-shim-dcr**.
This image also acts as the generic reservation mechanics arbiter to make sure
that only Y number of simulations are spawned on any given HW node.

- *Container Image Location*: Docker image at snergster/csit-shim.

- *Container Definition*: Docker file specified at [CsitShimDcrFile]_.

- *Initializing*: Container is initialized from within *Consul by HashiCorp*
  and *Nomad by HashiCorp*. Required docker parameters, to be able to run
  nested containers with VF reservation system are: privileged, net=host,
  pid=host.

- *Connectivity*: Over SSH only, using <host>:6022 format. Currently using
  *root* user account as primary. From the jenkins slave it will be able to
  connect via env variable, since the jenkins slave doesn't actually know what
  host its running on.

  ::

      ssh -p 6022 root@10.30.51.node

csit-sut-dcr
~~~~~~~~~~~~

This :abbr:`DCR` acts as an :abbr:`SUT (System Under Test)`. Any :abbr:`DUT` or
:abbr:`TG` application is installed there. It is RECOMMENDED to install DUT and
all DUT dependencies via commands ``rpm -ihv`` on RedHat based OS or ``dpkg -i``
on Debian based OS.

Container is designed to be a very lightweight Docker image that only installs
packages and execute binaries (previously built or downloaded on
**jenkins-slave-dcr**) and contains libraries necessary to run CSIT framework
including those required by DUT/TG.

- *Container Image Location*: Docker image at snergster/csit-sut.

- *Container Definition*: Docker file specified at [CsitSutDcrFile]_.

- *Initializing*:
  ::

    docker run
    # Run the container in the background and print the new container ID.
    --detach=true
    # Give extended privileges to this container. A "privileged" container is
    # given access to all devices and able to run nested containers.
    --privileged
    # Publish all exposed ports to random ports on the host interfaces.
    --publish-all
    # Automatically remove the container when it exits.
    --rm
    # Size of /dev/shm.
    dcr_stc_params+="--shm-size 512M "
    # Override access to PCI bus by attaching a filesystem mount to the
    # container.
    dcr_stc_params+="--mount type=tmpfs,destination=/sys/bus/pci/devices "
    # Mount vfio to be able to bind to see bound interfaces. We cannot use
    # --device=/dev/vfio as this does not see newly bound interfaces.
    dcr_stc_params+="--volume /dev/vfio:/dev/vfio "
    # Mount docker.sock to be able to use docker deamon of the host.
    dcr_stc_params+="--volume /var/run/docker.sock:/var/run/docker.sock "
    # Mount /opt/boot/ where VM kernel and initrd are located.
    dcr_stc_params+="--volume /opt/boot/:/opt/boot/ "
    # Mount host hugepages for VMs.
    dcr_stc_params+="--volume /dev/hugepages/:/dev/hugepages/ "

  Container name is catenated from **csit-** prefix and uuid generated uniquely
  for each container instance.

- *Connectivity*: Over SSH only, using <host>[:<port>] format. Currently using
  *root* user account as primary.
  ::

    ssh -p <port> root@10.30.51.<node>

Container required to run as ``--privileged`` due to ability to create nested
containers and have full read/write access to sysfs (for bind/unbind). Docker
automatically pick free network port (``--publish-all``) for ability to connect
over ssh. To be able to limit access to PCI bus, container is creating tmpfs
mount type in PCI bus tree. CSIT reservation script is dynamically linking only
PCI devices (NIC cards) that are reserved for particular container. This
way it is not colliding with other containers. To make vfio work, access to
``/dev/vfio`` must be granted.

.. todo: Change default user to testuser with non-privileged and install sudo.

Environment initialization
--------------------------

All 1-node servers are to be managed and provisioned via the [ansiblelink]_ set
of playbooks with *vpp-device* role. Full playbooks can be found under
[fdiocsitansible]_ directory. This way we are able to track all configuration
changes of physical servers in gerrit (in structured yaml format) as well as we
are able to extend *vpp-device* to additional servers with less effort or
re-stage servers in case of failure.

SR-IOV VF initialization is done via ``systemd`` service during host system boot
up. Service with name *csit-initialize-vfs.service* is created under systemd
system context (``/etc/systemd/system/``). By default service is calling
``/usr/local/bin/csit-initialize-vfs.sh`` with single parameter:

- **start**: Creates maximum number of :abbr:`virtual functions (VFs)` (detected
  from ``sriov_totalvfs``) for each whitelisted PCI device.
- **stop**: Removes all :abbr:`VFs` for all whitelisted PCI device.

Service is considered active even when all of its processes exited successfully.
Stopping service will automatically remove :abbr:`VFs`.

::

    [Unit]
    Description=CSIT Initialize SR-IOV VFs
    After=network.target

    [Service]
    Type=one-shot
    RemainAfterExit=True
    ExecStart=/usr/local/bin/csit-initialize-vfs.sh start
    ExecStop=/usr/local/bin/csit-initialize-vfs.sh stop

    [Install]
    WantedBy=default.target

Script is driven by two array variables ``pci_blacklist``/``pci_whitelist``.
They MUST store all PCI addresses in **<domain>:<bus>:<device>.<func>** format,
where:

- **pci_blacklist**: PCI addresses to be skipped from :abbr:`VFs`
  initialization (usefull for e.g. excluding management network interfaces).
- **pci_whitelist**: PCI addresses to be included for :abbr:`VFs`
  initialization.

VF reservation
--------------

During topology initialization phase of script, mutex is used to avoid multiple
instances of script to interact with each other during resources allocation.
Mutal exclusion ensure that no two distinct instances of script will get same
resource list.

Reservation function reads the list of all available virtual function network
devices in system:

::

    # Find the first ${device_count} number of available TG Linux network
    # VF device names. Only allowed VF PCI IDs are filtered.
    for netdev in ${tg_netdev[@]}
    do
        for netdev_path in $(grep -l "${pci_id}" \
                             /sys/class/net/${netdev}*/device/device \
                             2> /dev/null)
        do
            if [[ ${#TG_NETDEVS[@]} -lt ${device_count} ]]; then
                tg_netdev_name=$(dirname ${netdev_path})
                tg_netdev_name=$(dirname ${tg_netdev_name})
                TG_NETDEVS+=($(basename ${tg_netdev_name}))
            else
                break
            fi
        done
        if [[ ${#TG_NETDEVS[@]} -eq ${device_count} ]]; then
            break
        fi
    done

Where ``${pci_id}`` is ID of white-listed VF PCI ID. For more information please
see [pciids]_. This act as security constraint to prevent taking other unwanted
interfaces.
The output list of all VF network devices is split into two lists for TG and
SUT side of connection. First two items from each TG or SUT network devices
list are taken to expose directly to namespace of container. This can be done
via commands:

::

    $ ip link set ${netdev} netns ${DCR_CPIDS[tg]}
    $ ip link set ${netdev} netns ${DCR_CPIDS[dut1]}

In this stage also symbolic links to PCI devices under sysfs bus directory tree
are created in running containers. Once VF devices are assigned to container
namespace and PCI deivces are linked to running containers and mutex is exited.
Selected VF network device automatically dissapear from parent container
namespace, so another instance of script will not find device under that
namespace.

Once Docker container exits, network device is returned back into parent
namespace and can be reused.

Network traffic isolation - Intel i40evf
----------------------------------------

In a virtualized environment, on Intel(R) Server Adapters that support SR-IOV,
the virtual function (VF) may be subject to malicious behavior. Software-
generated layer two frames, like IEEE 802.3x (link flow control), IEEE 802.1Qbb
(priority based flow-control), and others of this type, are not expected and
can throttle traffic between the host and the virtual switch, reducing
performance. To resolve this issue, configure all SR-IOV enabled ports for
VLAN tagging. This configuration allows unexpected, and potentially malicious,
frames to be dropped. [inteli40e]_

To configure VLAN tagging for the ports on an SR-IOV enabled adapter,
use the following command. The VLAN configuration SHOULD be done
before the VF driver is loaded or the VM is booted. [inteli40e]_

::

    $ ip link set dev <PF netdev id> vf <id> vlan <vlan id>

For example, the following instructions will configure PF eth0 and
the first VF on VLAN 10.

::

    $ ip link set dev eth0 vf 0 vlan 10

VLAN Tag Packet Steering allows to send all packets with a specific VLAN tag to
a particular SR-IOV virtual function (VF). Further, this feature allows to
designate a particular VF as trusted, and allows that trusted VF to request
selective promiscuous mode on the Physical Function (PF). [inteli40e]_

To set a VF as trusted or untrusted, enter the following command in the
Hypervisor:

::

  $ ip link set dev eth0 vf 1 trust [on|off]

Once the VF is designated as trusted, use the following commands in the VM
to set the VF to promiscuous mode. [inteli40e]_

- For promiscuous all:
  ::

      $ ip link set eth2 promisc on

- For promiscuous Multicast:
  ::

      $ ip link set eth2 allmulti on

.. note::

    By default, the ethtool priv-flag vf-true-promisc-support is set to
    *off*, meaning that promiscuous mode for the VF will be limited. To set the
    promiscuous mode for the VF to true promiscuous and allow the VF to see
    all ingress traffic, use the following command.
    $ ethtool set-priv-flags p261p1 vf-true-promisc-support on
    The vf-true-promisc-support priv-flag does not enable promiscuous mode;
    rather, it designates which type of promiscuous mode (limited or true)
    you will get when you enable promiscuous mode using the ip link commands
    above. Note that this is a global setting that affects the entire device.
    However,the vf-true-promisc-support priv-flag is only exposed to the first
    PF of the device. The PF remains in limited promiscuous mode (unless it
    is in MFP mode) regardless of the vf-true-promisc-support setting.
    [inteli40e]_

Service described earlier *csit-initialize-vfs.service* is responsible for
assigning 802.1Q vlan tagging to each vitual function via physical function
from list of white-listed PCI addresses by following (simplified) code.

::

    SCRIPT_DIR="$(dirname $(readlink -e "${BASH_SOURCE[0]}"))"
    source "${SCRIPT_DIR}/csit-initialize-vfs-data.sh"

    # Initilize whitelisted NICs with maximum number of VFs.
    pci_idx=0
    for pci_addr in ${PCI_WHITELIST[@]}; do
        if ! [[ ${PCI_BLACKLIST[*]} =~ "${pci_addr}" ]]; then
            pci_path="/sys/bus/pci/devices/${pci_addr}"
            # SR-IOV initialization
            case "${1:-start}" in
                "start" )
                    sriov_totalvfs=$(< "${pci_path}"/sriov_totalvfs)
                    ;;
                "stop" )
                    sriov_totalvfs=0
                    ;;
            esac
            echo ${sriov_totalvfs} > "${pci_path}"/sriov_numvfs
            # SR-IOV 802.1Q isolation
            case "${1:-start}" in
                "start" )
                    pf=$(basename "${pci_path}"/net/*)
                    for vf in $(seq "${sriov_totalvfs}"); do
                        # PCI address index in array (pairing siblings).
                        if [[ -n ${PF_INDICES[@]} ]]
                        then
                            vlan_pf_idx=${PF_INDICES[$pci_addr]}
                        else
                            vlan_pf_idx=$((pci_idx % (${#PCI_WHITELIST[@]}/2)))
                        fi
                        # 802.1Q base offset.
                        vlan_bs_off=1100
                        # 802.1Q PF PCI address offset.
                        vlan_pf_off=$(( vlan_pf_idx * 100 + vlan_bs_off ))
                        # 802.1Q VF PCI address offset.
                        vlan_vf_off=$(( vlan_pf_off + vf - 1 ))
                        # VLAN string.
                        vlan_str="vlan ${vlan_vf_off}"
                        # MAC string.
                        mac5="$(printf '%x' ${pci_idx})"
                        mac6="$(printf '%x' $(( vf - 1 )))"
                        mac_str="mac ba:dc:0f:fe:${mac5}:${mac6}"
                        # Set 802.1Q VLAN id and MAC address
                        ip link set ${pf} vf $(( vf - 1)) ${mac_str} ${vlan_str}
                        ip link set ${pf} vf $(( vf - 1)) trust on
                        ip link set ${pf} vf $(( vf - 1)) spoof off
                    done
                    pci_idx=$(( pci_idx + 1 ))
                    ;;
            esac
            rmmod i40evf
            modprobe i40evf
        fi
    done

Assignment starts at VLAN 1100 and incrementing by 1 for each VF and by 100 for
each white-listed PCI address up to the middle of the PCI list. Second half of
the lists is assumed to be directly (cable) paired siblings and assigned with
same 802.1Q VLANs as its siblings.

Open tasks
----------

Security
~~~~~~~~

.. note::

    Switch to non-privileged containers: As of now all three container
    flavors are using privileged containers to make it working. Explore options
    to switch containers to non-privileged with explicit rather implicit
    privileges.

.. note::

    Switch to testuser account intead of root.

Maintainability
~~~~~~~~~~~~~~~

.. note::

    Docker image distribution: Create jenkins jobs with full pipiline of
    CI/CD for CSIT Docker images.

Stability
~~~~~~~~~

.. note::

    Implement queueing mechanism: Currently there is no mechanics that
    would place starving jobs in queue in case of no resources available.

.. note::

    Replace reservation script with Docker network plugin written in
    GOLANG/SH/Python - platform independent.

Links
-----

.. [TWSLink] `TWS <https://wiki.fd.io/view/CSIT/TWS>`_
.. [dockerhub] `Docker hub <https://hub.docker.com/>`_
.. [fdiocsitgerrit] `FD.io/CSIT gerrit <https://gerrit.fd.io/r/CSIT>`_
.. [fdioregistry] `FD.io registy <registry.fdiopoc.net>`_
.. [JenkinsSlaveDcrFile] `jenkins-slave-dcr-file <https://github.com/snergfdio/multivppcache/blob/master/ubuntu18/Dockerfile>`_
.. [CsitShimDcrFile] `csit-shim-dcr-file <https://github.com/snergfdio/multivppcache/blob/master/csit-shim/Dockerfile>`_
.. [CsitSutDcrFile] `csit-sut-dcr-file <https://github.com/snergfdio/multivppcache/blob/master/csit-sut/Dockerfile>`_
.. [ansiblelink] `ansible <https://www.ansible.com/>`_
.. [fdiocsitansible] `Fd.io/CSIT ansible <https://git.fd.io/csit/tree/fdio.infra.ansible>`_
.. [inteli40e] `Intel i40e <https://downloadmirror.intel.com/26370/eng/readme.txt>`_
.. [pciids] `pci ids <http://pci-ids.ucw.cz/v2.2/pci.ids>`_