16. dpdk-graph Application

The dpdk-graph tool is a Data Plane Development Kit (DPDK) application that allows exercising various graph use cases. This application has a generic framework to add new graph based use cases to verify functionality. Each use case is defined as a <usecase>.cli file. Based on the input file, application creates a graph to cater the use case.

Also this application framework can be used by other graph-based applications.

16.1. Running the Application

The application has a number of command line options which can be provided in following syntax:

dpdk-graph [EAL Options] -- [application options]

16.1.1. EAL Options

Following are the EAL command-line options that can be used in conjunction with the dpdk-graph application. See the DPDK Getting Started Guides for more information on these options.

-c <COREMASK> or -l <CORELIST>

Set the hexadecimal bit mask of the cores to run on. The CORELIST is a list of cores to be used.

16.1.2. Application Options

Following are the application command-line options:

-h

Set the host IPv4 address over which telnet session can be opened. It is an optional parameter. Default host address is 0.0.0.0.

-p

Set the L4 port number over which telnet session can be opened.
It is an optional parameter. Default port is 8086.

-s

Script name with absolute path which specifies the use case. It is a mandatory parameter which will be used to create desired graph for a given use case.

--enable-graph-stats

Enable graph statistics printing on console. By default, graph statistics are disabled.

--help

Dumps application usage.

16.2. Supported Use cases

16.2.1. l3fwd

This use case is supported for both H/W and PCAP vdev network devices. To demonstrate, corresponding .cli files are available at app/graph/examples/ named as l3fwd.cli and l3fwd_pcap.cli respectively.

16.2.2. l2fwd

This use case is supported for both H/W and PCAP vdev network devices. To demonstrate, corresponding .cli files are available at app/graph/examples/ named as l2fwd.cli and l2fwd_pcap.cli respectively.

16.2.2.1. Example Commands

For H/W devices

./dpdk-graph -c 0xff -a 0002:02:00.0 -a 0002:03:00.0 --
             -s <dpdk_root_dir>/app/graph/examples/l3fwd.cli

./dpdk-graph -c 0xff -a 0002:02:00.0 -a 0002:03:00.0 --
             -s <dpdk_root_dir>/app/graph/examples/l2fwd.cli

For net_pcapX devices

./dpdk-graph -c 0xff --vdev=net_pcap0,rx_pcap=in_net_pcap0.pcap,tx_pcap=out_net_pcap1.pcap
                     --vdev=net_pcap1,rx_pcap=in_net_pcap1.pcap,tx_pcap=out_net_pcap0.pcap
                     -- -s <dpdk_root_dir>/app/graph/examples/l3fwd_pcap.cli

./dpdk-graph -c 0xff --vdev=net_pcap0,rx_pcap=in_net_pcap0.pcap,tx_pcap=out_net_pcap1.pcap
                     --vdev=net_pcap1,rx_pcap=in_net_pcap1.pcap,tx_pcap=out_net_pcap0.pcap
                     -- -s <dpdk_root_dir>/app/graph/examples/l2fwd_pcap.cli

16.2.2.2. Verifying traffic

l3fwd.cli and l3fwd_pcap.cli creates setup with two network ports. Routing between these ports are done by lookup node routing information. For current use case, following routing table is used:

DIP        port
10.0.2.2    1
20.0.2.2    0

On the successful execution of l3fwd.cli or l3fwd_pcap.cli, user needs to send traffic with mentioned DIP.

For net_pcapX devices, required pcap file should be created and passed to application. These pcap files can be created in several ways. Scapy is one of the method to get the same:

# scapy
>>> pkts=[Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="10.0.2.2")]
>>>
>>> wrpcap("in_net_pcap1.pcap",pkts)
>>>
>>> pkts=[Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="29.0.0.1", dst="20.0.2.2"),
          Ether(dst="FA:09:F9:D7:E0:9D", src="10:70:1d:2f:42:2d")/IP(src="28.0.0.1", dst="20.0.2.2")]
>>>
>>> wrpcap("in_net_pcap0.pcap",pkts)
>>> quit

16.3. Supported CLI commands

This section provides details on commands which can be used in <usecase>.cli file to express the requested use case configuration.

Table 16.95 Exposed CLIs
Command Description Scope Optional
graph <usecases> [bsz <size>]
[tmo <ns>] [coremask <bitmask>]
model <rtc/mcd/default> pcap_enable
<0/1> num_pcap_pkts <num> pcap_file
<output_capture_file>
Command to express the desired
use case. Also enables/disable
pcap capturing.
 1 No
graph start
Command to start the graph.
This command triggers that no
more commands are left to be
parsed and graph initialization
can be started now. It must be
the last command in usecase.cli
 1 No
graph stats show
Command to dump current graph
statistics.
 2 Yes
help graph
Command to dump graph help
message.
 2 Yes
mempool <mempool_name> size
<mbuf_size> buffers
<number_of_buffers>
cache <cache_size> numa <numa_id>
Command to create mempool which
will be further associated to
RxQ to dequeue the packets.
 1 No
help mempool
Command to dump mempool help
message.
 2 Yes
ethdev <ethdev_name> rxq <n_queues>
txq <n_queues> <mempool_name>
Command to create DPDK port with
given number of Rx and Tx queues
. Also attach RxQ with given
mempool. Each port can have
single mempool only i.e. all
RxQs will share the same mempool
.
 1 No
ethdev <ethdev_name> mtu <mtu_sz>
Command to configure MTU of DPDK
port.
 3 Yes
ethdev forward <tx_dev_name>
<rx_dev_name>
Command to configure port
forwarding of DPDK
 1 Yes
ethdev <ethdev_name> promiscuous
<on/off>
Command to enable/disable
promiscuous mode on DPDK port.
 3 Yes
ethdev <ethdev_name> show
Command to dump current ethdev
configuration.
 2 Yes
ethdev <ethdev_name> stats
Command to dump current ethdev
statistics.
 2 Yes
ethdev <ethdev_name> ip4 addr add
<ip> netmask <mask>
Command to configure IPv4
address on given PCI device. It
is needed if user wishes to use
ipv4_lookup node.
 3 Yes
ethdev <ethdev_name> ip6 addr add
<ip> netmask <mask>
Command to configure IPv6
address on given PCI device. It
is needed if user wishes to use
ipv6_lookup node.
 3 Yes
help ethdev
Command to dump ethdev help
message.
 2 Yes
ipv4_lookup route add ipv4 <ip>
netmask <mask> via <ip>
Command to add a route into
ipv4_lookup LPM table. It is
needed if user wishes to route
the packets based on LPM lookup
table.
 3 Yes
help ipv4_lookup
Command to dump ipv4_lookup
help message.
 2 Yes
ipv6_lookup route add ipv6 <ip>
netmask <mask> via <ip>
Command to add a route into
ipv6_lookup LPM table. It is
needed if user wishes to route
the packets based on LPM6 lookup
table.
 3 Yes
help ipv6_lookup
Command to dump ipv6_lookup
help message.
 2 Yes
neigh add ipv4 <ip> <mac>
Command to add a neighbour
information into
ipv4_rewrite node.
 3 Yes
neigh add ipv6 <ip> <mac>
Command to add a neighbour
information into
ipv6_rewrite node.
 3 Yes
help neigh
Command to dump neigh help
message.
 2 Yes
ethdev_rx map port <ethdev_name>
queue <q_num> core <core_id>
Command to add port-queue-core
mapping to ethdev_rx node.
ethdev_rx node instance will
be pinned on given core and will
poll on requested port/queue
pair.
 1 No
help ethdev_rx
Command to dump ethdev_rx help
message.
 2 Yes
  1. Script only
  2. Telnet only
  3. Script and telnet both

16.4. Runtime configuration

Application allows some configuration to be modified at runtime using a telnet session. Application initiates a telnet server with host address 0.0.0.0 and port number 8086 by default.

If user passes -h and -p options while running application, then corresponding IP address and port number will be used for telnet session.

After successful launch of application, client can connect to application using given host & port and console will be accessed with prompt graph>.

Command to access a telnet session:

telnet <host> <port>

Example: dpdk-graph is started with -h 10.28.35.207 and -p 50000 then

$ telnet 10.28.35.207 50000
Trying 10.28.35.207...
Connected to 10.28.35.207.
Escape character is '^]'.

Welcome!

graph>
graph>
graph> help ethdev

----------------------------- ethdev command help -----------------------------
ethdev <ethdev_name> rxq <n_queues> txq <n_queues> <mempool_name>
ethdev <ethdev_name> ip4 addr add <ip> netmask <mask>
ethdev <ethdev_name> ip6 addr add <ip> netmask <mask>
ethdev forward <tx_dev_name> <rx_dev_name>
ethdev <ethdev_name> promiscuous <on/off>
ethdev <ethdev_name> mtu <mtu_sz>
ethdev <ethdev_name> stats
ethdev <ethdev_name> show
graph>

To exit the telnet session, type Ctrl + ]. This changes the graph> command prompt to telnet> command prompt. Now running close or quit command on telnet> prompt will terminate the telnet session.

16.5. Created graph for use case

On the successful execution of <usecase>.cli file, corresponding graph will be created. This section mentions the created graph for each use case.

16.5.1. l3fwd

../_images/graph-usecase-l3fwd.svg

16.5.2. l2fwd

../_images/graph-usecase-l2fwd.svg