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    Copyright (c) 2015, Cisco Systems, Inc.
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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
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