1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(C) 2021 Marvell.
7 The CNXK ETHDEV PMD (**librte_net_cnxk**) provides poll mode ethdev driver
8 support for the inbuilt network device found in **Marvell OCTEON CN9K/CN10K**
9 SoC family as well as for their virtual functions (VF) in SR-IOV context.
11 More information can be found at `Marvell Official Website
12 <https://www.marvell.com/embedded-processors/infrastructure-processors>`_.
17 Features of the CNXK Ethdev PMD are:
19 - Packet type information
24 - Multiple queues for TX and RX
25 - Receiver Side Scaling (RSS)
27 - Inner and Outer Checksum offload
28 - Port hardware statistics
29 - Link state information
32 - Scatter-Gather IO support
33 - Vector Poll mode driver
34 - Support Rx interrupt
39 See :doc:`../platform/cnxk` for setup information.
42 Driver compilation and testing
43 ------------------------------
45 Refer to the document :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
50 Follow instructions available in the document
51 :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
56 .. code-block:: console
58 ./<build_dir>/app/dpdk-testpmd -c 0xc -a 0002:02:00.0 -- --portmask=0x1 --nb-cores=1 --port-topology=loop --rxq=1 --txq=1
59 EAL: Detected 4 lcore(s)
60 EAL: Detected 1 NUMA nodes
61 EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
62 EAL: Selected IOVA mode 'VA'
63 EAL: No available hugepages reported in hugepages-16777216kB
64 EAL: No available hugepages reported in hugepages-2048kB
65 EAL: Probing VFIO support...
66 EAL: VFIO support initialized
67 EAL: using IOMMU type 1 (Type 1)
68 [ 2003.202721] vfio-pci 0002:02:00.0: vfio_cap_init: hiding cap 0x14@0x98
69 EAL: Probe PCI driver: net_cn10k (177d:a063) device: 0002:02:00.0 (socket 0)
71 EAL: No legacy callbacks, legacy socket not created
72 testpmd: create a new mbuf pool <mb_pool_0>: n=155456, size=2176, socket=0
73 testpmd: preferred mempool ops selected: cn10k_mempool_ops
74 Configuring Port 0 (socket 0)
75 PMD: Port 0: Link Up - speed 25000 Mbps - full-duplex
77 Port 0: link state change event
78 Port 0: 96:D4:99:72:A5:BF
79 Checking link statuses...
81 No commandline core given, start packet forwarding
82 io packet forwarding - ports=1 - cores=1 - streams=1 - NUMA support enabled, MP allocation mode: native
83 Logical Core 3 (socket 0) forwards packets on 1 streams:
84 RX P=0/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
86 io packet forwarding packets/burst=32
87 nb forwarding cores=1 - nb forwarding ports=1
88 port 0: RX queue number: 1 Tx queue number: 1
89 Rx offloads=0x0 Tx offloads=0x10000
91 RX desc=4096 - RX free threshold=0
92 RX threshold registers: pthresh=0 hthresh=0 wthresh=0
95 TX desc=512 - TX free threshold=0
96 TX threshold registers: pthresh=0 hthresh=0 wthresh=0
97 TX offloads=0x0 - TX RS bit threshold=0
100 Runtime Config Options
101 ----------------------
103 - ``Rx&Tx scalar mode enable`` (default ``0``)
105 PMD supports both scalar and vector mode, it may be selected at runtime
106 using ``scalar_enable`` ``devargs`` parameter.
108 - ``RSS reta size`` (default ``64``)
110 RSS redirection table size may be configured during runtime using ``reta_size``
111 ``devargs`` parameter.
115 -a 0002:02:00.0,reta_size=256
117 With the above configuration, reta table of size 256 is populated.
119 - ``Flow priority levels`` (default ``3``)
121 RTE Flow priority levels can be configured during runtime using
122 ``flow_max_priority`` ``devargs`` parameter.
126 -a 0002:02:00.0,flow_max_priority=10
128 With the above configuration, priority level was set to 10 (0-9). Max
129 priority level supported is 32.
131 - ``Reserve Flow entries`` (default ``8``)
133 RTE flow entries can be pre allocated and the size of pre allocation can be
134 selected runtime using ``flow_prealloc_size`` ``devargs`` parameter.
138 -a 0002:02:00.0,flow_prealloc_size=4
140 With the above configuration, pre alloc size was set to 4. Max pre alloc
141 size supported is 32.
143 - ``Max SQB buffer count`` (default ``512``)
145 Send queue descriptor buffer count may be limited during runtime using
146 ``max_sqb_count`` ``devargs`` parameter.
150 -a 0002:02:00.0,max_sqb_count=64
152 With the above configuration, each send queue's descriptor buffer count is
153 limited to a maximum of 64 buffers.
155 - ``Switch header enable`` (default ``none``)
157 A port can be configured to a specific switch header type by using
158 ``switch_header`` ``devargs`` parameter.
162 -a 0002:02:00.0,switch_header="higig2"
164 With the above configuration, higig2 will be enabled on that port and the
165 traffic on this port should be higig2 traffic only. Supported switch header
166 types are "higig2", "dsa", "chlen90b" and "chlen24b".
168 - ``RSS tag as XOR`` (default ``0``)
170 The HW gives two options to configure the RSS adder i.e
172 * ``rss_adder<7:0> = flow_tag<7:0> ^ flow_tag<15:8> ^ flow_tag<23:16> ^ flow_tag<31:24>``
174 * ``rss_adder<7:0> = flow_tag<7:0>``
176 Latter one aligns with standard NIC behavior vs former one is a legacy
177 RSS adder scheme used in OCTEON TX2 products.
179 By default, the driver runs in the latter mode.
180 Setting this flag to 1 to select the legacy mode.
182 For example to select the legacy mode(RSS tag adder as XOR)::
184 -a 0002:02:00.0,tag_as_xor=1
189 Above devarg parameters are configurable per device, user needs to pass the
190 parameters to all the PCIe devices if application requires to configure on
191 all the ethdev ports.
196 ``mempool_cnxk`` external mempool handler dependency
197 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
199 The OCTEON CN9K/CN10K SoC family NIC has inbuilt HW assisted external mempool manager.
200 ``net_cnxk`` pmd only works with ``mempool_cnxk`` mempool handler
201 as it is performance wise most effective way for packet allocation and Tx buffer
202 recycling on OCTEON TX2 SoC platform.
207 The OCTEON CN9K/CN10K SoC family NICs strip the CRC for every packet being received by
208 the host interface irrespective of the offload configuration.
213 .. _table_cnxk_ethdev_debug_options:
215 .. table:: cnxk ethdev debug options
217 +---+------------+-------------------------------------------------------+
218 | # | Component | EAL log command |
219 +===+============+=======================================================+
220 | 1 | NIX | --log-level='pmd\.net.cnxk,8' |
221 +---+------------+-------------------------------------------------------+
222 | 2 | NPC | --log-level='pmd\.net.cnxk\.flow,8' |
223 +---+------------+-------------------------------------------------------+