-.. BSD LICENSE
+.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2015-2017 Netronome Systems, Inc. All rights reserved.
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-
NFP poll mode driver library
============================
Driver (PMD) supporting Netronome's Network Flow Processor 6xxx
(NFP-6xxx) and Netronome's Flow Processor 4xxx (NFP-4xxx).
-NFP is a SRIOV capable device and the PMD driver supports the physical
+NFP is a SRIOV capable device and the PMD supports the physical
function (PF) and the virtual functions (VFs).
Dependencies
Of course, a DPDK app will require such a BSP installed for using the
NFP PMD, along with a specific NFP firmware application.
-Default PMD configuration is at the **common_linuxapp configuration** file:
-
-- **CONFIG_RTE_LIBRTE_NFP_PMD=y**
-
Once the DPDK is built all the DPDK apps and examples include support for
the NFP PMD.
more than one SmartNIC, same type of SmartNIC or different ones, and to upload a
different firmware to each SmartNIC.
+ .. Note::
+ Currently the NFP PMD supports using the PF with Agilio Basic Firmware. See
+ https://help.netronome.com/support/solutions for more information on the
+ various firmwares supported by the Netronome Agilio CX smartNIC.
PF multiport support
--------------------
-Some NFP cards support several physical ports with just one single PCI device.
-The DPDK core is designed with a 1:1 relationship between PCI devices and DPDK
-ports, so NFP PMD PF support requires handling the multiport case specifically.
-During NFP PF initialization, the PMD will extract the information about the
-number of PF ports from the firmware and will create as many DPDK ports as
-needed.
+The NFP PMD can work with up to 8 ports on the same PF device. The number of
+available ports is firmware and hardware dependent, and the driver looks for a
+firmware symbol during initialization to know how many can be used.
+
+DPDK apps work with ports, and a port is usually a PF or a VF PCI device.
+However, with the NFP PF multiport there is just one PF PCI device. Supporting
+this particular configuration requires the PMD to create ports in a special way,
+although once they are created, DPDK apps should be able to use them as normal
+PCI ports.
+
+NFP ports belonging to same PF can be seen inside PMD initialization with a
+suffix added to the PCI ID: wwww:xx:yy.z_portn. For example, a PF with PCI ID
+0000:03:00.0 and four ports is seen by the PMD code as:
+
+ .. code-block:: console
+
+ 0000:03:00.0_port0
+ 0000:03:00.0_port1
+ 0000:03:00.0_port2
+ 0000:03:00.0_port3
-Because the unusual relationship between a single PCI device and several DPDK
-ports, there are some limitations when using more than one PF DPDK port: there
-is no support for RX interrupts and it is not possible either to use those PF
-ports with the device hotplug functionality.
+ .. Note::
+ There are some limitations with multiport support: RX interrupts and
+ device hot-plugging are not supported.
PF multiprocess support
-----------------------
Due to how the driver needs to access the NFP through a CPP interface, which implies
-to use specific registers inside the chip, the number of secondary proceses with PF
-ports is limitted to only one.
+to use specific registers inside the chip, the number of secondary processes with PF
+ports is limited to only one.
This limitation will be solved in future versions but having basic multiprocess support
is important for allowing development and debugging through the PF using a secondary
git.droids-corp.org / dpdk.git / blobdiff