========================================
In addition to Poll Mode Drivers (PMDs) for physical and virtual hardware,
-the DPDK also includes two pure-software PMDs. These two drivers are:
+the DPDK also includes pure-software PMDs, two of these drivers are:
* A libpcap -based PMD (librte_pmd_pcap) that reads and writes packets using libpcap,
- both from files on disk, as well as from physical NIC devices using standard Linux kernel drivers.
.. note::
- The libpcap -based PMD is disabled by default in the build configuration files,
- owing to an external dependency on the libpcap development files which must be installed on the board.
- Once the libpcap development files are installed,
- the library can be enabled by setting CONFIG_RTE_LIBRTE_PMD_PCAP=y and recompiling the DPDK.
+ The libpcap -based PMD has an external dependency on the libpcap development files which must
+ be installed on the board.
Using the Drivers from the EAL Command Line
-------------------------------------------
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,stream_opt0=..,stream_opt1=..' \
--vdev='net_pcap1,stream_opt0=..'
tx_pcap=/path/to/file.pcap
* rx_iface: Defines a reception stream based on a network interface name.
- The driver reads packets coming from the given interface using the Linux kernel driver for that interface.
+ The driver reads packets from the given interface using the Linux kernel driver for that interface.
+ The driver captures both the incoming and outgoing packets on that interface.
The value is an interface name.
rx_iface=eth0
+* rx_iface_in: Defines a reception stream based on a network interface name.
+ The driver reads packets from the given interface using the Linux kernel driver for that interface.
+ The driver captures only the incoming packets on that interface.
+ The value is an interface name.
+
+ rx_iface_in=eth0
+
* tx_iface: Defines a transmission stream based on a network interface name.
The driver sends packets to the given interface using the Linux kernel driver for that interface.
The value is an interface name.
iface=eth0
+Runtime Config Options
+^^^^^^^^^^^^^^^^^^^^^^
+
+- Use PCAP interface physical MAC
+
+ In case ``iface=`` configuration is set, user may want to use the selected interface's physical MAC
+ address. This can be done with a ``devarg`` ``phy_mac``, for example::
+
+ --vdev 'net_pcap0,iface=eth0,phy_mac=1'
+
+- Use the RX PCAP file to infinitely receive packets
+
+ In case ``rx_pcap=`` configuration is set, user may want to use the selected PCAP file for rudimental
+ performance testing. This can be done with a ``devarg`` ``infinite_rx``, for example::
+
+ --vdev 'net_pcap0,rx_pcap=file_rx.pcap,infinite_rx=1'
+
+ When this mode is used, it is recommended to drop all packets on transmit by not providing a tx_pcap or tx_iface.
+
+ This option is device wide, so all queues on a device will either have this enabled or disabled.
+ This option should only be provided once per device.
+
+- Drop all packets on transmit
+
+ The user may want to drop all packets on tx for a device. This can be done by not providing a tx_pcap or tx_iface, for example::
+
+ --vdev 'net_pcap0,rx_pcap=file_rx.pcap'
+
+ In this case, one tx drop queue is created for each rxq on that device.
+
+ - Receive no packets on Rx
+
+ The user may want to run without receiving any packets on Rx. This can be done by not providing a rx_pcap or rx_iface, for example::
+
+ --vdev 'net_pcap0,tx_pcap=file_tx.pcap'
+
+In this case, one dummy rx queue is created for each tx queue argument passed
+
Examples of Usage
^^^^^^^^^^^^^^^^^
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,rx_pcap=file_rx.pcap,tx_pcap=file_tx.pcap' \
-- --port-topology=chained
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,rx_iface=eth0,tx_pcap=file_tx.pcap' \
-- --port-topology=chained
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,rx_pcap=file_rx.pcap,tx_iface=eth1' \
-- --port-topology=chained
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
- --vdev 'net_pcap0,iface=eth0' --vdev='net_pcap1;iface=eth1'
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
+ --vdev 'net_pcap0,iface=eth0' --vdev='net_pcap1,iface=eth1'
+
+Enable 2 tx queues on a network interface:
+
+.. code-block:: console
+
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
+ --vdev 'net_pcap0,rx_iface=eth1,tx_iface=eth1,tx_iface=eth1' \
+ -- --txq 2
+
+Read only incoming packets from a network interface and write them back to the same network interface:
+
+.. code-block:: console
+
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
+ --vdev 'net_pcap0,rx_iface_in=eth1,tx_iface=eth1'
Using libpcap-based PMD with the testpmd Application
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: console
- $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,rx_pcap=file_rx.pcap,tx_pcap=file_tx.pcap' \
-- --port-topology=chained --no-flush-rx
+.. note::
+
+ The network interface provided to the PMD should be up. The PMD will return
+ an error if interface is down, and the PMD itself won't change the status
+ of the external network interface.
+
Rings-based PMD
~~~~~~~~~~~~~~~
.. code-block:: console
- ./testpmd -l 1-3 -n 4 --vdev=net_ring0 --vdev=net_ring1 -- -i
+ ./dpdk-testpmd -l 1-3 -n 4 --vdev=net_ring0 --vdev=net_ring1 -- -i
EAL: Detected lcore 1 as core 1 on socket 0
...
git.droids-corp.org / dpdk.git / blobdiff