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authorDeclan Doherty <declan.doherty@intel.com>2014-12-01 17:10:12 +0000
committerThomas Monjalon <thomas.monjalon@6wind.com>2014-12-05 17:26:54 +0100
commitb0152b1b40fe02de4cd65441f469842417e37474 (patch)
tree3c4b0f176334d07d4f931fa8ec60ed5f687ec021
parent94aa16b45c722156df8c458c4e841b991b072688 (diff)
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doc: update bonding
Adding details for link status interrupts and link status polling. Adding details for mode 4 / mode 5 Tidying up rst document to conform to 80 character line limit Adding diagrams to explain bonding modes Removed link_bonding.png file Signed-off-by: Declan Doherty <declan.doherty@intel.com> Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>
-rw-r--r--doc/guides/prog_guide/img/bond-mode-0.svg638
-rw-r--r--doc/guides/prog_guide/img/bond-mode-1.svg724
-rw-r--r--doc/guides/prog_guide/img/bond-mode-2.svg702
-rw-r--r--doc/guides/prog_guide/img/bond-mode-3.svg702
-rw-r--r--doc/guides/prog_guide/img/bond-mode-4.svg784
-rw-r--r--doc/guides/prog_guide/img/bond-mode-5.svg642
-rw-r--r--doc/guides/prog_guide/img/bond-overview.svg121
-rw-r--r--doc/guides/prog_guide/img/link_bonding.pngbin223318 -> 0 bytes
-rw-r--r--doc/guides/prog_guide/link_bonding_poll_mode_drv_lib.rst365
9 files changed, 4578 insertions, 100 deletions
diff --git a/doc/guides/prog_guide/img/bond-mode-0.svg b/doc/guides/prog_guide/img/bond-mode-0.svg
new file mode 100644
index 0000000..eff0edb
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diff --git a/doc/guides/prog_guide/img/bond-overview.svg b/doc/guides/prog_guide/img/bond-overview.svg
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@@ -0,0 +1,121 @@
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diff --git a/doc/guides/prog_guide/img/link_bonding.png b/doc/guides/prog_guide/img/link_bonding.png
deleted file mode 100644
index 6843879..0000000
--- a/doc/guides/prog_guide/img/link_bonding.png
+++ /dev/null
Binary files differ
diff --git a/doc/guides/prog_guide/link_bonding_poll_mode_drv_lib.rst b/doc/guides/prog_guide/link_bonding_poll_mode_drv_lib.rst
index badd891..08e4424 100644
--- a/doc/guides/prog_guide/link_bonding_poll_mode_drv_lib.rst
+++ b/doc/guides/prog_guide/link_bonding_poll_mode_drv_lib.rst
@@ -35,21 +35,25 @@ In addition to Poll Mode Drivers (PMDs) for physical and virtual hardware,
Intel® DPDK also includes a pure-software library that
allows physical PMD's to be bonded together to create a single logical PMD.
-|link_bonding|
+|bond-overview|
-The Link Bonding PMD library(librte_pmd_bond) supports bonding of groups of physical ports of the same speed (1GbE, 10GbE and 40GbE) and
-duplex to provide similar the capabilities to that found in Linux bonding driver to allow the aggregation of multiple (slave) NICs
-into a single logical interface between a server and a switch.
-The new bonded PMD will then process these interfaces based on the mode of operation specified to provide support for features
-such as redundant links, fault tolerance and/or load balancing.
+The Link Bonding PMD library(librte_pmd_bond) supports bonding of groups of
+``rte_eth_dev`` ports of the same speed and duplex to provide
+similar the capabilities to that found in Linux bonding driver to allow the
+aggregation of multiple (slave) NICs into a single logical interface between a
+server and a switch. The new bonded PMD will then process these interfaces
+based on the mode of operation specified to provide support for features such
+as redundant links, fault tolerance and/or load balancing.
-The librte_pmd_bond library exports a C API which provides an API for the creation of bonded devices
-as well as the configuration and management of the bonded device and its slave devices.
+The librte_pmd_bond library exports a C API which provides an API for the
+creation of bonded devices as well as the configuration and management of the
+bonded device and its slave devices.
.. note::
- The Link Bonding PMD Library is enabled by default in the build configuration files,
- the library can be disabled by setting CONFIG_RTE_LIBRTE_PMD_BOND=n and recompiling the Intel® DPDK.
+ The Link Bonding PMD Library is enabled by default in the build
+ configuration files, the library can be disabled by setting
+ ``CONFIG_RTE_LIBRTE_PMD_BOND=n`` and recompiling the Intel® DPDK.
Link Bonding Modes Overview
---------------------------
@@ -57,143 +61,255 @@ Link Bonding Modes Overview
Currently the Link Bonding PMD library supports 4 modes of operation:
* **Round-Robin (Mode 0):**
- This mode provides load balancing and fault tolerance by transmission of packets
- in sequential order from the first available slave device through the last.
- Packets are bulk dequeued from devices then serviced in round-robin manner.
+
+|bond-mode-0|
+
+ This mode provides load balancing and fault tolerance by transmission of
+ packets in sequential order from the first available slave device through
+ the last. Packets are bulk dequeued from devices then serviced in a
+ round-robin manner. This mode does not guarantee in order reception of
+ packets and down stream should be able to handle out of order packets.
* **Active Backup (Mode 1):**
- In this mode only one slave in the bond is active at any time, a different slave becomes active if,
- and only if, the primary active slave fails,
- thereby providing fault tolerance to slave failure.
- The single logical bonded interface's MAC address is externally visible on only one NIC (port)
+
+|bond-mode-1|
+
+ In this mode only one slave in the bond is active at any time, a different
+ slave becomes active if, and only if, the primary active slave fails,
+ thereby providing fault tolerance to slave failure. The single logical
+ bonded interface's MAC address is externally visible on only one NIC (port)
to avoid confusing the network switch.
* **Balance XOR (Mode 2):**
- This mode provides load balancing based on transmit packets based on the selected XOR transmission policy and fault tolerance.
- The default policy (layer2) uses a simple XOR calculation on the packet source / destination MAC address to select the slave to transmit on.
- Alternate transmission policies supported are layer 2+3, this uses the IP source and destination addresses in the calculation of the slave port and
- the final supported policy is layer 3+4, this uses IP source and destination addresses as well as the UDP source and destination port.
+
+|bond-mode-2|
+
+ This mode provides transmit load balancing (based on the selected
+ transmission policy) and fault tolerance. The default policy (layer2) uses
+ a simple calculation based on the packet flow source and destination MAC
+ addresses aswell as the number of active slaves available to the bonded
+ device to classify the packet to a specific slave to transmit on. Alternate
+ transmission policies supported are layer 2+3, this takes the IP source and
+ destination addresses into the calculation of the transmit slave port and
+ the final supported policy is layer 3+4, this uses IP source and
+ destination addresses as well as the TCP/UDP source and destination port.
+
+.. note::
+ The colouring differences of the packets are used to identify different flow
+ classification calculated by the selected transmit policy
+
* **Broadcast (Mode 3):**
- This mode provides fault tolerance by transmission of packets on all slave ports.
+
+|bond-mode-3|
+
+ This mode provides fault tolerance by transmission of packets on all slave
+ ports.
+
+* **Link Aggregation 802.3AD (Mode 4):**
+
+|bond-mode-4|
+
+ This mode provides dynamic link aggregation according to the 802.3ad
+ specification. It negotiates and monitors aggregation groups that share the
+ same speed and duplex settings using the selected balance transmit policy
+ for balancing outgoing traffic.
+
+ DPDK implementation of this mode provide some additional requirements of
+ the application.
+
+ #. It needs to call ``rte_eth_tx_burst`` and ``rte_eth_rx_burst`` with
+ intervals period of less than 100ms.
+
+ #. Calls to ``rte_eth_tx_burst`` must have a buffer size of at least 2xN,
+ where N is the number of slaves. This is a space required for LACP
+ frames. Additionally LACP packets are included in the statistics, but
+ they are not returned to the application.
+
+* **Transmit Load Balancing (Mode 5):**
+
+|bond-mode-5|
+
+ This mode provides an adaptive transmit load balancing. It dynamically
+ changes the transmitting slave, according to the computed load. Statistics
+ are collected in 100ms intervals and scheduled every 10ms.
+
Implementation Details
----------------------
-The librte_pmd_bond onded device are compatible with the Ethernet device API exported by the Ethernet PMDs described in the *Intel® DPDK API Reference*.
+The librte_pmd_bond bonded device are compatible with the Ethernet device API
+exported by the Ethernet PMDs described in the *Intel® DPDK API Reference*.
-The Link Bonding Library supports the creation of bonded devices at application startup time during EAL initialization using the
---vdev option as well as programmatically via the C API rte_eth_bond_create function.
+The Link Bonding Library supports the creation of bonded devices at application
+startup time during EAL initialization using the ``--vdev`` option as well as
+programmatically via the C API ``rte_eth_bond_create`` function.
Bonded devices support the dynamical addition and removal of slave devices using
-the rte_eth_bond_slave_add / rte_eth_bond_slave_remove APIs.
+the ``rte_eth_bond_slave_add`` / ``rte_eth_bond_slave_remove`` APIs.
After a slave device is added to a bonded device slave is stopped using
-rte_eth_dev_stop and the slave reconfigured using rte_eth_dev_configure the RX and TX queues are also reconfigured
-using rte_eth_tx_queue_setup / rte_eth_rx_queue_setup with the parameters use to configure the bonding device.
+``rte_eth_dev_stop`` and then reconfigured using ``rte_eth_dev_configure``
+the RX and TX queues are also reconfigured using ``rte_eth_tx_queue_setup`` /
+``rte_eth_rx_queue_setup`` with the parameters use to configure the bonding
+device.
+
+Link Status Change Interrupts / Polling
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Link bonding devices support the registration of a link status change callback,
+using the ``rte_eth_dev_callback_register`` API, this will be called when the
+status of the bonding device changes. For example in the case of a bonding
+device which has 3 slaves, the link status will change to up when one slave
+becomes active or change to down when all slaves become inactive. There is no
+callback notification when a single slave changes state and the previous
+conditions are not met. If a user wishes to monitor individual slaves then they
+must register callbacks with that slave directly.
+
+The link bonding library also supports devices which do not implement link
+status change interrupts, this is achieve by polling the devices link status at
+a defined period which is set using the ``rte_eth_bond_link_monitoring_set``
+API, the default polling interval is 10ms. When a device is added as a slave to
+a bonding device it is determined using the ``RTE_PCI_DRV_INTR_LSC`` flag
+whether the device supports interrupts or whether the link status should be
+monitored by polling it.
Requirements / Limitations
~~~~~~~~~~~~~~~~~~~~~~~~~~
-The current implementation only supports physical devices of the same type, speed and duplex to be added as slaves.
-The bonded device inherits these values from the first active slave added to the bonded device
-and then all further slaves added to the bonded device must match these parameters.
+The current implementation only supports devices that support the same speed
+and duplex to be added as a slaves to the same bonded device. The bonded device
+inherits these attributes from the first active slave added to the bonded
+device and then all further slaves added to the bonded device must support
+these parameters.
-A bonding device must have a minimum of one slave before the bonding device itself can be started.
+A bonding device must have a minimum of one slave before the bonding device
+itself can be started.
-Like all other PMD, all functions exported by a PMD are lock-free functions that are assumed
-not to be invoked in parallel on different logical cores to work on the same target object.
+Like all other PMD, all functions exported by a PMD are lock-free functions
+that are assumed not to be invoked in parallel on different logical cores to
+work on the same target object.
-It should also be noted that the PMD receive function should not be invoked directly on a slave devices after they have
-been to a bonded device since packets read directly from the slave device will no longer be available to the bonded device to read.
+It should also be noted that the PMD receive function should not be invoked
+directly on a slave devices after they have been to a bonded device since
+packets read directly from the slave device will no longer be available to the
+bonded device to read.
Configuration
~~~~~~~~~~~~~
-Link bonding devices are created using the rte_eth_bond_create API
+Link bonding devices are created using the ``rte_eth_bond_create`` API
which requires a unique device name, the bonding mode,
and the socket Id to allocate the bonding device's resources on.
-The other configurable parameters for a bonded device are its slave devices, its primary slave,
-a user defined MAC address and transmission policy to use if the device is balance XOR mode.
+The other configurable parameters for a bonded device are its slave devices,
+its primary slave, a user defined MAC address and transmission policy to use if
+the device is in balance XOR mode.
Slave Devices
^^^^^^^^^^^^^
-Bonding devices support up to a maximum of RTE_MAX_ETHPORTS slave devices of the same speed and duplex.
-Ethernet devices can be added as a slave to a maximum of one bonded device.
-Slave devices are reconfigured with the configuration of the bonded device on being added to a bonded device.
+Bonding devices support up to a maximum of ``RTE_MAX_ETHPORTS`` slave devices
+of the same speed and duplex. Ethernet devices can be added as a slave to a
+maximum of one bonded device. Slave devices are reconfigured with the
+configuration of the bonded device on being added to a bonded device.
-The bonded also guarantees to return the MAC address of the slave device to its original value of removal of a slave from it.
+The bonded also guarantees to return the MAC address of the slave device to its
+original value of removal of a slave from it.
Primary Slave
^^^^^^^^^^^^^
-The primary slave is used to define the default port to use when a bonded device is in active backup mode.
-A different port will only be used if, and only if, the current primary port goes down.
-If the user does not specify a primary port it will default to being the first port added to the bonded device.
+The primary slave is used to define the default port to use when a bonded
+device is in active backup mode. A different port will only be used if, and
+only if, the current primary port goes down. If the user does not specify a
+primary port it will default to being the first port added to the bonded device.
MAC Address
^^^^^^^^^^^
-The bonded device can be configured with a user specified MAC address,
-this address will be inherited by the some/all slave devices depending on the operating mode.
-If the device is in active backup mode then only the primary device will have the user specified MAC,
-all other slaves will retain their original MAC address.
-In mode 0, 2, and 3 all slaves devices are configure with the bonded devices MAC address.
+The bonded device can be configured with a user specified MAC address, this
+address will be inherited by the some/all slave devices depending on the
+operating mode. If the device is in active backup mode then only the primary
+device will have the user specified MAC, all other slaves will retain their
+original MAC address. In mode 0, 2, 3, 4 all slaves devices are configure with
+the bonded devices MAC address.
-If a user defined MAC address is not defined then the bonded device will default to using the primary slaves MAC address.
+If a user defined MAC address is not defined then the bonded device will
+default to using the primary slaves MAC address.
Balance XOR Transmit Policies
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-There are 3 supported transmission policies for bonded device running in Balance XOR mode. Layer 2, Layer 2+3, Layer 3+4.
+There are 3 supported transmission policies for bonded device running in
+Balance XOR mode. Layer 2, Layer 2+3, Layer 3+4.
-* **Layer 2:** Ethernet MAC address based balancing is the default transmission policy for Balance XOR bonding mode.
- It uses a simple XOR calculation on the source MAC address and destination MAC address of the packet and
- then calculate the modulus of this value to calculate the slave device to transmit the packet on.
+* **Layer 2:** Ethernet MAC address based balancing is the default
+ transmission policy for Balance XOR bonding mode. It uses a simple XOR
+ calculation on the source MAC address and destination MAC address of the
+ packet and then calculate the modulus of this value to calculate the slave
+ device to transmit the packet on.
-* **Layer 2 + 3:** Ethernet MAC address & IP Address based balancing uses a combination of source/destination MAC addresses and
- the source/destination IP addresses of the data packet to decide which slave port the packet will be transmitted on.
+* **Layer 2 + 3:** Ethernet MAC address & IP Address based balancing uses a
+ combination of source/destination MAC addresses and the source/destination
+ IP addresses of the data packet to decide which slave port the packet will
+ be transmitted on.
-* **Layer 3 + 4:** IP Address & UDP Port based balancing uses a combination of source/destination IP Address and
- the source/destination UDP ports of the packet of the data packet to decide which slave port the packet will be transmitted on.
+* **Layer 3 + 4:** IP Address & UDP Port based balancing uses a combination
+ of source/destination IP Address and the source/destination UDP ports of
+ the packet of the data packet to decide which slave port the packet will be
+ transmitted on.
-All these policies support 802.1Q VLAN Ethernet packets, as well as IPv4, IPv6 and UDP protocols for load balancing.
+All these policies support 802.1Q VLAN Ethernet packets, as well as IPv4, IPv6
+and UDP protocols for load balancing.
Using Link Bonding Devices
--------------------------
-The librte_pmd_bond library support two modes of device creation, the libraries export full C API or
-using the EAL command line to statically configure link bonding devices at application startup.
-Using the EAL option it is possible to use link bonding functionality transparently without specific knowledge of the libraries API,
-this can be used, for example, to add bonding functionality, such as active backup,
-to an existing application which has no knowledge of the link bonding C API.
+The librte_pmd_bond library support two modes of device creation, the libraries
+export full C API or using the EAL command line to statically configure link
+bonding devices at application startup. Using the EAL option it is possible to
+use link bonding functionality transparently without specific knowledge of the
+libraries API, this can be used, for example, to add bonding functionality,
+such as active backup, to an existing application which has no knowledge of
+the link bonding C API.
Using the Poll Mode Driver from an Application
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Using the librte_pmd_bond libraries API it is possible to dynamicall create and manage link bonding device from within any application.
-Link bonding device are created using the rte_eth_bond_create API which requires a unqiue device name,
-the link bonding mode to initial the device in and finally the socket Id which to allocate the devices resources onto.
-After successful creation of a bonding device it must be configured using the generic Ethernet device configure API rte_eth_dev_configure
-and then the RX and TX queues which will be used must be setup using rte_eth_tx_queue_setup / rte_eth_rx_queue_setup.
-
-Slave devices can be dynamically added and removed from a link bonding device using the rte_eth_bond_slave_add / rte_eth_bond_slave_remove
-APIs but at least one slave device must be added to the link bonding device before it can be started using rte_eth_dev_start.
-
-The link status of a bonded device is dictated by that of its slaves, if all slave device link status are down or
-if all slaves are removed from the link bonding device then the link status of the bonding device will go down.
-
-It is also possible to configure / query the configuration of the control parameters of a bonded device using the provided APIs
-rte_eth_bond_mode_set/get, rte_eth_bond_primary_set/get, rte_eth_bond_mac_set/reset and rte_eth_bond_xmit_policy_set/get.
+Using the librte_pmd_bond libraries API it is possible to dynamically create
+and manage link bonding device from within any application. Link bonding
+device are created using the ``rte_eth_bond_create`` API which requires a
+unique device name, the link bonding mode to initial the device in and finally
+the socket Id which to allocate the devices resources onto. After successful
+creation of a bonding device it must be configured using the generic Ethernet
+device configure API ``rte_eth_dev_configure`` and then the RX and TX queues
+which will be used must be setup using ``rte_eth_tx_queue_setup`` /
+``rte_eth_rx_queue_setup``.
+
+Slave devices can be dynamically added and removed from a link bonding device
+using the ``rte_eth_bond_slave_add`` / ``rte_eth_bond_slave_remove``
+APIs but at least one slave device must be added to the link bonding device
+before it can be started using ``rte_eth_dev_start``.
+
+The link status of a bonded device is dictated by that of its slaves, if all
+slave device link status are down or if all slaves are removed from the link
+bonding device then the link status of the bonding device will go down.
+
+It is also possible to configure / query the configuration of the control
+parameters of a bonded device using the provided APIs
+``rte_eth_bond_mode_set/ get``, ``rte_eth_bond_primary_set/get``,
+``rte_eth_bond_mac_set/reset`` and ``rte_eth_bond_xmit_policy_set/get``.
Using Link Bonding Devices from the EAL Command Line
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Link bonding devices can be created at application startup time using the --vdev EAL command line option.
-The device name must start with the eth_bond prefix followed by numbers or letters. The name must be unique for each device.
-Each device can have multiple options arranged in a comma separated list.
-Multiple devices definitions can be arranged by calling the --vdev option multiple times.
+Link bonding devices can be created at application startup time using the
+``--vdev`` EAL command line option. The device name must start with the
+eth_bond prefix followed by numbers or letters. The name must be unique for
+each device. Each device can have multiple options arranged in a comma
+separated list. Multiple devices definitions can be arranged by calling the
+``--vdev`` option multiple times.
+
Device names and bonding options must be separated by commas as shown below:
.. code-block:: console
@@ -203,7 +319,8 @@ Device names and bonding options must be separated by commas as shown below:
Link Bonding EAL Options
^^^^^^^^^^^^^^^^^^^^^^^^
-There are multiple ways of definitions that can be assessed and combined as long as the following two rules are respected:
+There are multiple ways of definitions that can be assessed and combined as
+long as the following two rules are respected:
* A unique device name, in the format of eth_bondX is provided,
where X can be any combination of numbers and/or letters,
@@ -216,37 +333,79 @@ There are multiple ways of definitions that can be assessed and combined as long
The different options are:
* mode: Integer value defining the bonding mode of the device.
- Currently supports modes 0,1,2,3 (round-robin, active backup, balance, and broadcast).
+ Currently supports modes 0,1,2,3,4,5 (round-robin, active backup, balance,
+ broadcast, link aggregation, transmit load balancing).
+
+.. code-block:: console
mode=2
-* slave: Defines the PMD device which will be added as slave to the bonded device.
- This option can be selected multiple time, for each device to be added as a slave.
- Physical devices should be specified using their PCI address, in the format domain:bus:devid.function
+* slave: Defines the PMD device which will be added as slave to the bonded
+ device. This option can be selected multiple time, for each device to be
+ added as a slave. Physical devices should be specified using their PCI
+ address, in the format domain:bus:devid.function
+
+.. code-block:: console
slave=0000:0a:00.0,slave=0000:0a:00.1
* primary: Optional parameter which defines the primary slave port,
- is used in active backup mode to select the primary slave for data TX/RX if it is available.
- The primary port also is used to select the MAC address to use when it is not defined by the user.
- This defaults to the first slave added to the device if it is specified.
- The primary device must be a slave of the bonded device.
+ is used in active backup mode to select the primary slave for data TX/RX if
+ it is available. The primary port also is used to select the MAC address to
+ use when it is not defined by the user. This defaults to the first slave
+ added to the device if it is specified. The primary device must be a slave
+ of the bonded device.
+
+.. code-block:: console
primary=0000:0a:00.0
-* socket_id: Optional parameter used to select which socket on a NUMA device the bonded devices resources will be allocated on.
+* socket_id: Optional parameter used to select which socket on a NUMA device
+ the bonded devices resources will be allocated on.
+
+.. code-block:: console
socket_id=0
-* mac: Optional parameter to select a MAC address for link bonding device, this overrides the value of the primary slave device.
+* mac: Optional parameter to select a MAC address for link bonding device,
+ this overrides the value of the primary slave device.
+
+.. code-block:: console
mac=00:1e:67:1d:fd:1d
-* xmit_policy: Optional parameter which defines the transmission policy when the bonded device is in balance mode.
- If not user specified this defaults to l2 (layer 2) forwarding,
- the other transmission policies available are l23 (layer 2+3) and l34 (layer 3+4)
+* xmit_policy: Optional parameter which defines the transmission policy when
+ the bonded device is in balance mode. If not user specified this defaults
+ to l2 (layer 2) forwarding, the other transmission policies available are
+ l23 (layer 2+3) and l34 (layer 3+4)
+
+.. code-block:: console
+
+ xmit_policy=l23
+
+* lsc_poll_period_ms: Optional parameter which defines the polling interval
+ in milli-seconds at which devices which don't support lsc interrupts are
+ checked for a change in the devices link status
+
+.. code-block:: console
+
+ lsc_poll_period_ms=100
+
+* up_delay: Optional parameter which adds a delay in milli-seconds to the
+ propagation of a devices link status changing to up, by default this
+ parameter is zero.
+
+.. code-block:: console
+
+ up_delay=10
+
+* down_delay: Optional parameter which adds a delay in milli-seconds to the
+ propagation of a devices link status changing to down, by default this
+ parameter is zero.
+
+.. code-block:: console
- xmit_policy=l2
+ down_delay=50
Examples of Usage
^^^^^^^^^^^^^^^^^
@@ -275,4 +434,10 @@ Create a bonded device in balance mode with two slaves specified by their PCI ad
$RTE_TARGET/app/testpmd -c '0xf' -n 4 --vdev 'eth_bond0,mode=2, slave=0000:00a:00.01,slave=0000:004:00.00,xmit_policy=l34' -- --port-topology=chained
-.. |link_bonding| image:: img/link_bonding.png
+.. |bond-overview| image:: img/bond-overview.svg
+.. |bond-mode-0| image:: img/bond-mode-0.svg
+.. |bond-mode-1| image:: img/bond-mode-1.svg
+.. |bond-mode-2| image:: img/bond-mode-2.svg
+.. |bond-mode-3| image:: img/bond-mode-3.svg
+.. |bond-mode-4| image:: img/bond-mode-4.svg
+.. |bond-mode-5| image:: img/bond-mode-5.svg