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authorJohn Daley <johndale@cisco.com>2015-12-13 15:11:32 -0800
committerThomas Monjalon <thomas.monjalon@6wind.com>2015-12-14 01:19:14 +0100
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enic: add guide
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+.. BSD LICENSE
+ Copyright (c) 2015, Cisco Systems, Inc.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ 2. 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.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+ENIC Poll Mode Driver
+=====================
+
+ENIC PMD is the DPDK poll-mode driver for the Cisco System Inc. VIC Ethernet
+NICs. These adapters are also referred to as vNICs below. If you are running
+or would like to run DPDK software applications on Cisco UCS servers using
+Cisco VIC adapters the following documentation is relevant.
+
+Version Information
+-------------------
+
+The version of the ENIC PMD driver is 1.0.0.6 and will be printed by ENIC PMD
+during the initialization.
+
+How to obtain ENIC PMD integrated DPDK
+--------------------------------------
+
+ENIC PMD support is integrated into the DPDK suite. dpdk-<version>.tar.gz
+should be downloaded from http://dpdk.org
+
+
+Configuration information
+-------------------------
+
+- **DPDK Configuration Parameters**
+
+ The following configuration options are available for the ENIC PMD:
+
+ - **CONFIG_RTE_LIBRTE_ENIC_PMD** (default y): Enables or disables inclusion
+ of the ENIC PMD driver in the DPDK compilation.
+
+ - **CONFIG_RTE_LIBRTE_ENIC_DEBUG** (default n): Enables or disables debug
+ logging within the ENIC PMD driver.
+
+- **vNIC Configuration Parameters**
+
+ - **Number of Queues**
+
+ The maximum number of receive and transmit queues are configurable on a per
+ vNIC basis through the Cisco UCS Manager (CIMC or UCSM). These values
+ should be configured to be greater than or equal to the nb_rx_q and nb_tx_q
+ parameters expected to used in the call to the rte_eth_dev_configure()
+ function.
+
+ - **Size of Queues**
+
+ Likewise, the number of receive and transmit descriptors are configurable on
+ a per vNIC bases via the UCS Manager and should be greater than or equal to
+ the nb_rx_desc and nb_tx_desc parameters expected to be used in the calls
+ to rte_eth_rx_queue_setup() and rte_eth_tx_queue_setup() respectively.
+
+ - **Interrupts**
+
+ Only one interrupt per vNIC interface should be configured in the UCS
+ manager regardless of the number receive/transmit queues. The ENIC PMD
+ uses this interrupt to get information about errors in the fast path.
+
+Limitations
+-----------
+
+- **VLAN 0 Priority Tagging**
+
+ If a vNIC is configured in TRUNK mode by the UCS manager, the adapter will
+ priority tag egress packets according to 802.1Q if they were not already
+ VLAN tagged by software. If the adapter is connected to a properly configured
+ switch, there will be no unexpected behavior.
+
+ In test setups where an Ethernet port of a Cisco adapter in TRUNK mode is
+ connected point-to-point to another adapter port or connected though a router
+ instead of a switch, all ingress packets will be VLAN tagged. Programs such
+ as l3fwd which do not account for VLAN tags in packets will misbehave. The
+ solution is to enable VLAN stripping on ingress. The follow code fragment is
+ example of how to accomplish this:
+
+.. code-block:: console
+
+ vlan_offload = rte_eth_dev_get_vlan_offload(port);
+ vlan_offload |= ETH_VLAN_STRIP_OFFLOAD;
+ rte_eth_dev_set_vlan_offload(port, vlan_offload);
+
+How to build the suite?
+-----------------------
+The build instructions for the DPDK suite should be followed. By default
+the ENIC PMD library will be built into the DPDK library.
+
+For configuring and using UIO and VFIO frameworks, please refer the
+documentation that comes with DPDK suite.
+
+Supported Cisco VIC adapters
+----------------------------
+
+ENIC PMD supports all recent generations of Cisco VIC adapters including:
+
+- VIC 1280
+- VIC 1240
+- VIC 1225
+- VIC 1285
+- VIC 1225T
+- VIC 1227
+- VIC 1227T
+- VIC 1380
+- VIC 1340
+- VIC 1385
+- VIC 1387
+
+- Flow director features are not supported on generation 1 Cisco VIC adapters
+ (M81KR and P81E)
+
+Supported Operating Systems
+---------------------------
+Any Linux distribution fulfilling the conditions described in Dependencies
+section of DPDK documentation.
+
+Supported features
+------------------
+- Unicast, multicast and broadcast transmission and reception
+- Receive queue polling
+- Port Hardware Statistics
+- Hardware VLAN acceleration
+- IP checksum offload
+- Receive side VLAN stripping
+- Multiple receive and transmit queues
+- Flow Director ADD, UPDATE, DELETE, STATS operation support for IPV4 5-TUPLE
+ flows
+- Promiscuous mode
+- Setting RX VLAN (supported via UCSM/CIMC only)
+- VLAN filtering (supported via UCSM/CIMC only)
+- Execution of application by unprivileged system users
+- IPV4, IPV6 and TCP RSS hashing
+
+Known bugs and Unsupported features in this release
+---------------------------------------------------
+- Signature or flex byte based flow direction
+- Drop feature of flow direction
+- VLAN based flow direction
+- non-IPV4 flow direction
+- Setting of extended VLAN
+- UDP RSS hashing
+
+Prerequisites
+-------------
+- Prepare the system as recommended by DPDK suite. This includes environment
+ variables, hugepages configuration, tool-chains and configuration
+- Insert vfio-pci kernel module using the command 'modprobe vfio-pci' if the
+ user wants to use VFIO framework
+- Insert uio kernel module using the command 'modprobe uio' if the user wants
+ to use UIO framework
+- DPDK suite should be configured based on the user's decision to use VFIO or
+ UIO framework
+- If the vNIC device(s) to be used is bound to the kernel mode Ethernet driver
+ (enic), use 'ifconfig' to bring the interface down. The dpdk_nic_bind.py tool
+ can then be used to unbind the device's bus id from the enic kernel mode
+ driver.
+- Bind the intended vNIC to vfio-pci in case the user wants ENIC PMD to use
+ VFIO framework using dpdk_nic_bind.py.
+- Bind the intended vNIC to igb_uio in case the user wants ENIC PMD to use
+ UIO framework using dpdk_nic_bind.py.
+
+At this point the system should be ready to run DPDK applications. Once the
+application runs to completion, the vNIC can be detached from vfio-pci or
+igb_uio if necessary.
+
+Root privilege is required to bind and unbind vNICs to/from VFIO/UIO.
+VFIO framework helps an unprivileged user to run the applications.
+For an unprivileged user to run the applications on DPDK and ENIC PMD,
+it may be necessary to increase the maximum locked memory of the user.
+The following command could be used to do this.
+
+.. code-block:: console
+
+ sudo sh -c "ulimit -l <value in Kilo Bytes>"
+
+The value depends on the memory configuration of the application, DPDK and
+PMD. Typically, the limit has to be raised to higher than 2GB.
+e.g., 2621440
+
+The compilation of any unused drivers can be disabled using the
+configuration file in config/ directory (e.g., config/common_linuxapp).
+This would help in bringing down the time taken for building the
+libraries and the initialization time of the application.
+
+Additional Reference
+--------------------
+- http://www.cisco.com/c/en/us/products/servers-unified-computing
+
+Contact Information
+-------------------
+Any questions or bugs should be reported to DPDK community and to the ENIC PMD
+maintainers:
+
+- John Daley <johndale@cisco.com>
+- Sujith Sankar <ssujith@cisco.com>