-.. BSD LICENSE
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- All rights reserved.
-
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- modification, are permitted provided that the following conditions
- are met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in
- the documentation and/or other materials provided with the
- distribution.
- * Neither the name of Intel Corporation nor the names of its
- contributors may be used to endorse or promote products derived
- from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright(c) 2010-2015 Intel Corporation.
Link Bonding Poll Mode Driver Library
=====================================
In addition to Poll Mode Drivers (PMDs) for physical and virtual hardware,
DPDK also includes a pure-software library that
-allows physical PMD's to be bonded together to create a single logical PMD.
+allows physical PMDs to be bonded together to create a single logical PMD.
.. figure:: img/bond-overview.*
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.
+``rte_eth_dev`` ports of the same speed and duplex to provide similar
+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
Link Bonding Modes Overview
---------------------------
-Currently the Link Bonding PMD library supports 4 modes of operation:
+Currently the Link Bonding PMD library supports following modes of operation:
* **Round-Robin (Mode 0):**
``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.
+device. If RSS is enabled for bonding device, this mode is also enabled on new
+slave and configured as well.
+Any flow which was configured to the bond device also is configured to the added
+slave.
+
+Setting up multi-queue mode for bonding device to RSS, makes it fully
+RSS-capable, so all slaves are synchronized with its configuration. This mode is
+intended to provide RSS configuration on slaves transparent for client
+application implementation.
+
+Bonding device stores its own version of RSS settings i.e. RETA, RSS hash
+function and RSS key, used to set up its slaves. That let to define the meaning
+of RSS configuration of bonding device as desired configuration of whole bonding
+(as one unit), without pointing any of slave inside. It is required to ensure
+consistency and made it more error-proof.
+
+RSS hash function set for bonding device, is a maximal set of RSS hash functions
+supported by all bonded slaves. RETA size is a GCD of all its RETA's sizes, so
+it can be easily used as a pattern providing expected behavior, even if slave
+RETAs' sizes are different. If RSS Key is not set for bonded device, it's not
+changed on the slaves and default key for device is used.
+
+As RSS configurations, there is flow consistency in the bonded slaves for the
+next rte flow operations:
+
+Validate:
+ - Validate flow for each slave, failure at least for one slave causes to
+ bond validation failure.
+
+Create:
+ - Create the flow in all slaves.
+ - Save all the slaves created flows objects in bonding internal flow
+ structure.
+ - Failure in flow creation for existed slave rejects the flow.
+ - Failure in flow creation for new slaves in slave adding time rejects
+ the slave.
+
+Destroy:
+ - Destroy the flow in all slaves and release the bond internal flow
+ memory.
+
+Flush:
+ - Destroy all the bonding PMD flows in all the slaves.
+
+.. note::
+
+ Don't call slaves flush directly, It destroys all the slave flows which
+ may include external flows or the bond internal LACP flow.
+
+Query:
+ - Summarize flow counters from all the slaves, relevant only for
+ ``RTE_FLOW_ACTION_TYPE_COUNT``.
+
+Isolate:
+ - Call to flow isolate for all slaves.
+ - Failure in flow isolation for existed slave rejects the isolate mode.
+ - Failure in flow isolation for new slaves in slave adding time rejects
+ the slave.
+
+All settings are managed through the bonding port API and always are propagated
+in one direction (from bonding to slaves).
Link Status Change Interrupts / Polling
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A bonding device must have a minimum of one slave before the bonding device
itself can be started.
+To use a bonding device dynamic RSS configuration feature effectively, it is
+also required, that all slaves should be RSS-capable and support, at least one
+common hash function available for each of them. Changing RSS key is only
+possible, when all slave devices support the same key size.
+
+To prevent inconsistency on how slaves process packets, once a device is added
+to a bonding device, RSS and rte flow configurations should be managed through
+the bonding device API, and not directly on the slave.
+
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.
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
+net_bonding 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.
.. code-block:: console
- $RTE_TARGET/app/testpmd -c f -n 4 --vdev 'eth_bond0,bond_opt0=..,bond opt1=..'--vdev 'eth_bond1,bond _opt0=..,bond_opt1=..'
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev 'net_bonding0,bond_opt0=..,bond opt1=..'--vdev 'net_bonding1,bond _opt0=..,bond_opt1=..'
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:
-* A unique device name, in the format of eth_bondX is provided,
+* A unique device name, in the format of net_bondingX is provided,
where X can be any combination of numbers and/or letters,
and the name is no greater than 32 characters long.
.. code-block:: console
- $RTE_TARGET/app/testpmd -c '0xf' -n 4 --vdev 'eth_bond0,mode=0, slave=0000:00a:00.01,slave=0000:004:00.00' -- --port-topology=chained
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev 'net_bonding0,mode=0,slave=0000:0a:00.01,slave=0000:04:00.00' -- --port-topology=chained
Create a bonded device in round robin mode with two slaves specified by their PCI address and an overriding MAC address:
.. code-block:: console
- $RTE_TARGET/app/testpmd -c '0xf' -n 4 --vdev 'eth_bond0,mode=0, slave=0000:00a:00.01,slave=0000:004:00.00,mac=00:1e:67:1d:fd:1d' -- --port-topology=chained
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev 'net_bonding0,mode=0,slave=0000:0a:00.01,slave=0000:04:00.00,mac=00:1e:67:1d:fd:1d' -- --port-topology=chained
Create a bonded device in active backup mode with two slaves specified, and a primary slave specified by their PCI addresses:
.. code-block:: console
- $RTE_TARGET/app/testpmd -c '0xf' -n 4 --vdev 'eth_bond0,mode=1, slave=0000:00a:00.01,slave=0000:004:00.00,primary=0000:00a:00.01' -- --port-topology=chained
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev 'net_bonding0,mode=1,slave=0000:0a:00.01,slave=0000:04:00.00,primary=0000:0a:00.01' -- --port-topology=chained
Create a bonded device in balance mode with two slaves specified by their PCI addresses, and a transmission policy of layer 3 + 4 forwarding:
.. code-block:: console
- $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
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev 'net_bonding0,mode=2,slave=0000:0a:00.01,slave=0000:04:00.00,xmit_policy=l34' -- --port-topology=chained
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