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Change-Id: I0e5098747cc496da8632e8d6f779e418da03dc4a
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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There is a new parameter in the config_file: dataplane_subnet_mask. This
parameter is added to the dataplane IP addresses and is needed by the
Linux stack to deal with some protocols (e.g. ARP). If not present, the
default value of 24 will be used. In the end, this will make sure that
IP addresses in the rapid.env file will have this mask, e.g. /24
If you use other tools than createrapid.py to create the rapid.env file,
make sure to add the mask.
This commit also introduces a change when exiting: we only copy the
prox.log files from the different prox instances in case we expect a new
prox.log file to be created in these instances.
When using a valid format.yaml file, the tool will now also send the
latency distribution data (histogram) to the URL.
The tool is now also checking the value of bucket_size_exp: it needs to
be 11 or more.
Change-Id: I633cdc64ef687fdb6625be1e7482a5a371f83e93
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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When using "vdev=" in port section, a tap device and an additional dpdk
port are created. In most cases, we still want to use a real DPDK device
(i.e. bound to an interface such as virtio or a PF or a VF).
PROX will now report by default an error when the used [port] is not a
DPDK bound device.
An additional parameter "virtual=yes" can be added in the port section
in case one want to disable this error checking (e.g. specify additional
parameter for the vdev device).
This patch also fixes a potential endianess issue when configuring IP
addresses.
Change-Id: Iffdd9552308be3b77cfe2067630647acac2c01fe
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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deploycentostools.sh is now installing a recent PROX version. When using
background traffic, the tool is also reporting the total traffic that
was handled by the NFVi stack, including foreground & background
traffic.
The use of the prox_socket and prox_launch_exit was also broken in a
previous release and is now fixed.
When setting prox_socket to false for a PROX instance, we will not
create a socket connection to control that PROX instance. Setting this
option to false is not meaningful for the generator PROX instances since
we would not be able to control the behavior of the PROX generator
during the test. You could use the generator against another non-PROX
instance and then set prox_socket to false for that non-PROX instance.
Default is true.
prox_launch_exit is used to start and stop the PROX program inside the
instance. Default is true. This is useful in case you want to start PROX
manually to be able to inspect the PROX UI, but at the same time, let
the rapid scripts control the testing.
Change-Id: Ib5aa809f4be201859542769f5f55f4989dad97ef
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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git version is now printed in prox.log file.
- git_version.c is always recompiled
- If source have been locally changed, the build is shown as dirty
- If git is not available on the build system, a message such as
'make: git: Command not found'
will be printed, but the build will succeed.
Change-Id: If551832c6079f5e3bd04cd4d8ac5f8204e6be8cd
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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When the following conditions are met:
- ipv4
- vdev enabled
Then multiple vlans are supported.
Multiple vlans can be configured using the vlan_tag option within the port section of the config file.
Multiple (different) local_ipv4/prefix must then also be configured within the same section.
Note that for ipv6 multiple vlans are not supported (yet)
Also, when vdev is not enabled, multiple vlans are also not (yet) supported.
Change-Id: I38b6cd98ff2a0f484d1bf0910b15413ba21ae6d6
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: I3abc92652402162d15249e345446debdeb778176
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: Ib1b3d54f9cb8e4284eee7ed0998e96370762a17e
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: Iae35d3fa19ad7cf90d8c2e0c104b0e798ac34787
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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The "Latency" screen has been updated with 3 columns:
- mis-ordered
Count the number of mis-ordered packets.
- extent:
Gives an indication of how mis-ordered the packets are.
Receiving packet "x - 5" after receiving packet "x" will
cause an extent of 5.
- duplicate:
Count number of duplicate packets.
Following commands have been added for the impair mode:
- proba no drop: replaces the former "probability" command.
Percentage of forwarded packets. So 99.5 means 0.5% of packet drop.
- proba delay
Percentage of delayed packets for the impair mode.
- proba duplicate
Percentage of duplicate packets.
Similar parameters are supported within the config files:
- proba no drop
- proba delay
- proba duplicate
Note: it is recommanded to use the signature when measuring packet
misorder, as otherwise unexpected packet would cause miscounts.
Change-Id: I037f606f264d6e2bd7f123df5ed57ab7df8386d7
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Different PROX instances are now started in parallel. The script is
starting multiple threads.
Change-Id: Ia8785a792240d4e9b5d5d98174bc4c5d7ae5657c
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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A new parameter can be put in the *.test files so that the requested
traffic is not generated at once, but slowly increasing up to the
requested traffic. This is important for some SW switched that adapt and
learn from the applied traffic. When suddenly applying a high traffic,
the switch might not have enough time to learn and lose packets. Only
after a period of time (up to 10 seconds?), the switch can cope with the
traffic without packet loss. In order to get reproducible results in
this case with low packet loss, please put the parameter ramp_step in
the test section of the *.test file. The step is expressed in percentage
of a 10Gb/s traffic. If the parameter is not present, the load will be
immediately applied.
When the runrapid.py script is now finished, it also copies the prox.log
files from all the prox instances. In case of issues, please investigate
this log file.
When using background traffic, the tool will also print the average
background traffic for each step in the DEBUG log. In this way, you can
check that the background traffic is actually dealing with the same
amount of traffic as the foreground. The tool is printing the packet
reception rate of the background generators.
A bug was also fixed regarding the latency percentile reporting. When
using tests involving l2gen.cfg, the values of the percentile latency
were wrong.
Change-Id: Id3dd02ed5cab084414c717cf898b30e6980ddf31
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Rapid scripts are communicating to the PROX instances. Rapid scripts
will not work with every PROX version sice sometime we change the
interface between the scripts and PROX. Hence we have a commit ID in
deploycentostools.sh to make sure we have a version of PROX that we can
work with. This change will now ensure we have a recent PROX version
when we use deploycentostools.sh to build an image.
Change-Id: Ia634f61a2dc8f49188cec6697ebf5f980d35ce7d
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Even if the latency thresholds were defined in the TST009 test files,
the values were ignored and replaced by 'inf', whcih means the
thresholds were not taken into account to define a successful step. If
the thresholds are not defined in the test files, they are still set to
'inf'.
Change-Id: I9559f05fb6066ab8759900abe3eb53ff4662e510
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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In the port section of the PROX configuration file, a new parameter can
be added: all_rx_queues. The default is all_rx_queues=no.
When the rx port variable of a task is listing a port name, all rx
queues will be used when the all_rx_queues is set for that port.
If not set, only one queue of that port will be "consumed", each time
the port is referenced in the rx port variable.
When the all_rx_queues is set for a port, you should NOT reference that
port more than once in the rx port variables.
Change-Id: If9662b1ac07adeec9db88d2a25ca68aed0b9e213
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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As described in https://patches.dpdk.org/patch/60354/, we cannot set
mq_mode for a vertio device to ETH_MQ_RX_RSS. Therefore adding this
extra test before setting mq_mode.
Change-Id: I8a33cf73afaa2cef8b9b012bf8ebe7296e1e692d
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Change-Id: I7ac1bb78fe00407ff66945fcdf7b5d54c9025214
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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UDP and IP packet length and source UDP port and destination UDP port
were wrongly set for IPv6 packets.
In the *.test files, there is now an optional boolean field (ipv6) in
the [TestParameters] section. When set to true, the generator will use
the IPv6 packet layout to place the right values at the proper offset
in the packet. If not present or set to false, the IPv4 layout will be
used. Note also that packet size needs to be at least 84 bytes for IPV6
traffic since we need space for latency and other information in each
packet.
Packet loss ratio is now printed as a percentage of the total packets
sent.
Change-Id: I2136e87f3032348ae95b69052be7da8461c6303c
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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The IRQ test has been reworked to increase the accuracy of the IRQ
measurements. Results can now also be pushed to a Prometheus push
gateway or to OPNFV's Xtesting. In order to do so, a new file
format.yaml has been introduced. Please use this file now to specify the
details of the PushGateway or the Xtesting server.
Added new test: increment_till_fail.test
Change-Id: I111aae3e099bc03e3d2ddd1014a0301bac356e0b
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Due to the recent changes in the rapid scripts, Kubernetes environment need to be adjusted.
Ready for test flag file for the runrapid script created during the container start.
TUN device configuration added.
Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
Change-Id: I097aafbd1d1d102aa61b8b86842afcb2d6a51338
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Change-Id: I187ed4f282c6332a7e906bc03b51d26295a475ac
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: Iae0a0d95b5a216463ec7511337be4019fdd4359f
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: I7eeaaa3a0dfa1c0a831863e772b50697c5ff5054
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Using vfio in stead of igb_uio. DPDK 2020.5 is NOT compiling the igb_uio
driver by default any more.
For the l3 mode, we are now using the new PROX vdev feature. This is
achieved by adding the vdev parameter in the port section of the PROX
config files. One of the advantages is that we can now ping a port
managed by PROX: the requests will be forwarded by PROX to the LINUX
stack, who will reply to the ping. A tap device is being created by PROX
to support this feature.
Installing old version of nasm since latest causes some issues.
If not pushgateway is being used, it should be commented out in the
config_file.
vfio is now loaded by specifying the module in /etc/modules-load.d
There is also an after_boot.sh script that will be run by
check_prox_system_setup.sh, which can be used for further configuration
of the instance after boot.
There is now also a file created /opt/rapid/system_ready_for_rapid by
the check_prox_system_setup.sh script. This file is created once all
configuration is done. The runrapid.py script will wait till this file
is created before executing any tests.
Change-Id: Ic5c41af82642066af42134c3323297f5a06f6f72
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Option for Kubernetes environment clean up (createrapidk8s.py -c) from the test pods added.
Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
Change-Id: I1c6c7090462b55fbadd1d8f1a277470a6eeb2dee
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Fix scripts and build procedure to use /opt/rapid as a main directory for
binaries and config files.
Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
Change-Id: Icb38c37a85a78a6f2de2e751df5fafd624b4f1b3
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All config files are now copied into /opt/rapid. We are not using the
home directory any more. The prox executable is now also copied into the
same /opt/rapid.
Change-Id: I838636167f370bf8a855a3cfb0796c659e27a3ad
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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New files created in 2020 have now the right date in the copyright
notice.
Change-Id: I8eb244beec3d793e819cce1f63c39671f18286a1
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Change-Id: Iad6882cc28ac2039984b12f6b7a897b81d975d9b
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Also fixed minor issues such as
- prevent using vdev on DPDK <= 17.05 as not supported
- potential segmentation fault after panic (if panic thrown early
in prox initialization)
Change-Id: I49a1962e95a4a44dddadd1fdd906e1b3b232465c
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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- vdev devices now support VLAN.
- kernel tap device can be configured with a netmask (/24 was
always used in previous version).
- when sending a (fake) packet to the kernel, this packet will now
not be routed by the kernel (i.e. it will leave through the
interface configured by PROX). This might change in the futture
when PROX supports multiple VLANs per port. But today it prevents
ARP being sent on management interfaces.
- Log error in case kernel unable to send packet.
- Added support for comments (';') in lua sections.
- Prevent duplication of local_ipv4 - should now be configured in port section
local_ipv4 in core section still supported
Change-Id: I8f9a40fe6ad6f3013ff91b58b44627c7f34081e6
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Before this patch latency measurements were only
supported if signature was disabled.
Change-Id: I565b00f76818ab42e9cca4ddc32f9d857648929d
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: Idd72b593504139ac9d42c33767f8a18395b2cc87
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: I8cbbe1b08af9b5472c304f2fba3635f0a084fdd8
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: I45ea9741be1c552d8f13a7de027994c23995df69
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Following messages are now handled by PROX
- router_solicitation
- neighbour_solicitation
- router_advertisement
- neighbour_advertisement
The following parameters are supported (through the PROX config file)
- sub mode=ndp
This will enable handling of router and neighbour solicitation
and advertisement.
- local ipv6=xxxx:xxxx:xxxxx:xxxx:xxxx:xxxx:xxxx:xxxx
This will configure the local IPv6 address of the port.
This parameter is optional. If not specified, the local IPv6
will be calculated from the EUI.
- global ipv6=xxxx:xxxx:xxxxx:xxxx:xxxx:xxxx:xxxx:xxxx
This will configure the global IPv6 address of the port.
This parameter is optional. If not specified, the global IPv6
will be calculated from the EUI and the router prefix received
from the router.
- ipv6 router=yes
This will cause the core to behave as an IPv6 router
i.e. it will generate Router Advertisement messages
This is only useful in back to back cases, when no real
IPv6 router is present in the setup.
- router prefix=xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
The router prefix usedin the router advertisement
The prefix will be used by the node to build an IPv6 global
address in cases none were configured.
"Unsollicited NA" parameter has been added within the core/task section.
If set to yes (Unsollicited NA=yes), then an unsollicited neighbour
Advertisement is sent at startup
A same core/task cannot support both l3 and ndp mode.
Those messages will be generated or handled when submode
is set to "ndp":
- neighbour sollicitation
- neighbour advertisement
- router sollicitation
- router advertisement
An example configuration is provided: config/ipv6.cfg in which
port 0 / core 1 plays the role of the generator and port 1 /
core 2 plays the role of the swap.
Change-Id: Id0ab32d384448b4cf767fb4a1c486fc023f4f395
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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In Prox configuration IMIX can be specified using the following syntax:
imix=pkt_size,pkt_size... Up to 127 different pkt sizes can be specified.
Through command line, the following syntax can be used
imix core_id task_id pkt_size,pkt_size... Up to 127 packet sizes can be specified.
When IMIX is enabled, PROX will loop through the list of packet sizes.
PROX supports two different submodes to handle pcap files.
In the 1st submode (default, no submode specified), timestamps from
the pcap file are ignored. In this submode IMIX is supported as well and each
packets in the pcap file will be generated with all IMIX sizes.
In the second submode, called pcap in gen mode, packets are generated at
the timestamp specified in the pcap file. This submode does not support IMIX.
Change-Id: I53cbf1378a5364254285b81e6848350d98561184
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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A virtual device can be created adding the following option on the eal field within
the eal options section:
--vdev=net_ring0
This will cause a new (virtual) dpdk port to be created.
Such a device can then be used in a primary process as other DPDK devices i.e.
a [port x] section must be defined in the configuration file
For a secondary process, there is no need to add --vdev, but, of course
--proc-type=secondary (or --proc-type=auto) must be set within the eal field.
There are two ways to use such a virtual device in a secondary process
1) Using the DPDK port number. Note however that the DPDK port number of virtual devices
in the secondary process might not start from 0 and might hence have to be guessed
e.g. if using 2 virtual devices in primary process (--vdev=net_ring0 --vdev=net_ring1)
the port_id will be 0 and 1 in primary process and 2 & 3 in secondary process.
2) Using the port name, as defined in --vdev in the primary process. In this way,
no [port] section must be defined, and the virtual port names are directly used within
the "rx port" and "tx port" configuration e.g.:
rx port=net_ring0
tx port=net_ring1
Limitations
===========
There seems to be a PROX leak causing DPDK port id to increase when restarting the
secondary process (causing the secondary process configuration through port id more difficult).
As the primary process configures the port (including the number of rx and tx queues)
based on its config file, the secondary process can't setup its own queues.
Simple configurations (such as using gen or lat in primary, and swap in secondary) work as PROX
allocates a RX queue even in gen mode and a TX queue even in lat mode. Better configuration/support
for secondary process should be designed.
The use of dpdk port names is only supported by PROX within "rx port" and "tx port". It is not
supported by other configuration fields such as "tx ports from routing table".
The use of dpdk port names in "rx port" and "tx port" is limited to only 1 port.
Change-Id: Iaa606625da471403713a21df79d3ded4bb91b91e
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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In addition to a mmbuf leak when receiving netlink routes packets
this commit prevents sending the PROX pseudo packet i.e.
the packet PROX sends to the kernel socket to have it generate
an ARP request.
Change-Id: Iabbdecbe412e4b90ac0df7e30fa36d096c5326f0
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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For kernel supported devices, add for vlan tag support
This can be configured through port parameter:
vlan tag=<vlan tag>
If this parameter is set, a vlan tagged interface is created
on top of the tap device
This is only supported for vdev tap devices
When sending (untagged) packet to the tap device (through socket)
the tap should react in sending tagged packet
Note that receiving in L3 mode (w/o tap support) a tagged packet
is not yet supported.
Change-Id: I363fa2f8d2341ac41ef23620222ece1d944bf336
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Two cases where performance has been improved
- When using a gateway from a routing table (l3 submode),
store the mac within the next hop table, to avoid a hash_lookup.
This gives ~10% improvement.
- Read tsc only once per bulk (of up to 64 packets).
This gives ~10% improvement to swap, 4% to gen.
In addition a small fix has been added, preventig "No route" Error
to be written too aften.
Change-Id: I8a7ab74a32f09c8ff47f751ee91e84afee1b2147
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Through this commit BGP messages are forwarded to tap device
Netlink messages are enabled to receive route Updates.
In addition, generating tasks can also specify a routing table
which will be used when sending packets
The routes initialized by the routing table can be changed through
the reception of BGP messages
Change-Id: I187ba9a921885cbc9b209aae5fb654309e3388b8
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Change-Id: I8f570940d2c4e1fc09ebae03105e436f5caebbd3
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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The crlplane performance has been improved. This is necessary when
handling many IP in L3 mode (i.e. many ARP Requests/Replies).
Before this change, arp timer was updated as soon as an
arp request was tentativaly sent to the master. This means that,
if the request failed to be sent (e.g. ring full) we had to wait
arp_update_time (default 1sec) before trying again.
Now arp_update_time is only used when an arp reply is received.
If a request has been successfully sent, then the arp timer
is updated by 1 second (i.e. we will not send any arp reuest for this
IP within this second)
If we failed to send the request, then the timer is updated by 100 msec
which means we will wait 100 msec before trying again.
A too high value here would have meant that we have to wait a long time
before trying again. A too short value overload the master ring with
request to transmit ARP requests, so that master is unable to handle
arp replies.
arp_update_time is now also partly randomized to avoid all IPs to request
arp request at the beginning of the test. So if arp_update_time is 10 sec
then the configuration sets it to 5 to 15 sec.
As a final note the following parameter (already implemented before)
can be changed to improve ctrlplane performance (at the cost of dataplane)
ctrl path polling frequency=10000
Change-Id: I9660458a22e7442eaa0c83aaa0c9893a15069f98
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Through this commit ARP and ICMP messages are forwarded to the kernel
when vdev tap devices are enabled, as well as PROX l3 mode.
ICMP support has also been added to master (i.e. PROX L3 mode) and to
swap (so when L3 submode is not enabled).
Change-Id: Ie6bf52cbae7171bfca041ff18651d4ec866f44cd
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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This commit adds support for the creation of tap devices.
To create a tap device, and associate it with a DPDK port,
add within the port section:
vdev=<tap_name>
local ipv4=<ip_assigned_to_port>
<tap_name> will appear as a kernel network device, with an IP <ip_assigned_to_port>
ARP packets received from the network on the DPDK interface will be forwarded to the kernel.
1st packet which needs to be generated to a new IP will cause an IP packet
to be sent to the kernel (using socket sendto) forcing the kernel to send an ARP_REQUEST.
In this commit, there is no notification from the kernel about ARP table changes.
This is subject to further commits.
Two config files, gen_tap.cfg and swap_tap.cfg have been created. They work one against each other.
*** Note however that they do not work if running within the same host
(with the port being connected back to back) ***
This is due to the fact that the kernel would bypass the ports and use local interface...
Change-Id: Iadeec0d99e3c693472ea44bdb9163a3bf97df2fa
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
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Since runrapid.py is now supporting more than 1 dataplane interface, we
need to use a port index in the rapid.env file for the dataplane ports.
In k8sdeployment.py, we only support 1 dataplane port, but we are
writing dp_ip1 and dp_mac1 in the environment file. The copyright dates
are also updated. Some references to VM have also been changed to instance.
Change-Id: Ie1d036c13ef5d6f0aa1f35aa068a9760a1cfc2a9
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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IPV6 test has been added. The generator will now generate IPV6 packets
using NDP to resolve MAC addresses. The hex IP addresses in the inline
definition of the packets in the cfg files is now calculated by a lua
function called in parameters.lua. The hard-coded path /home/centos has
been replaced by ~. An error in the speed calculations has been fixed.
See the RapidTest class for details. The actual number of generated
flows is now reported. If the requested number of flows is not a power
of 2, the lowest power of 2 that is larger than the requested number of
flows will be used and reported.
Change-Id: I36b8d345b4a03c2cf358c19ec353ca8ad2831293
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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All packet size in the *.test files have been replaces with imix sizes.
imix is now a list of packet sizes. If you want to run with only a
pakcet size of 64, you need to specify a list containing only 1 size:
[64].
You can also specify multiple imix values by specifying a list of list
of sizes. The keyworkds in the test files are now imix & imixs.
Change-Id: Iea47c0266b022133b7bbfc9a6811e3199ae41521
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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yaml files have been added to the repo as an example. Please check the
README explaining the output section reqs for this yaml file. There is
also a new file (config_file): it also specifies which yaml files to
use. multiple dataplane interfaces per VM can now be specified and will
appear in the <STACK>.env file. An error in setting the packet size has
been fixed (see set_udp_packet_size for packet size setting details)
Change-Id: Ie89a4940521dac7dd3652acca477739abb9f5497
Signed-off-by: Luc Provoost <luc.provoost@intel.com>
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Xavier Simonart
Luc Provoost
Yury Kylulin