.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2019 Marvell International Ltd.
Marvell OCTEON TX2 Platform Guide
=================================
This document gives an overview of **Marvell OCTEON TX2** RVU H/W block,
packet flow and procedure to build DPDK on OCTEON TX2 platform.
More information about OCTEON TX2 SoC can be found at `Marvell Official Website
<https://www.marvell.com/embedded-processors/infrastructure-processors/>`_.
Supported OCTEON TX2 SoCs
-------------------------
- CN98xx
- CN96xx
- CN93xx
OCTEON TX2 Resource Virtualization Unit architecture
----------------------------------------------------
The :numref:`figure_octeontx2_resource_virtualization` diagram depicts the
RVU architecture and a resource provisioning example.
.. _figure_octeontx2_resource_virtualization:
.. figure:: img/octeontx2_resource_virtualization.*
OCTEON TX2 Resource virtualization architecture and provisioning example
Resource Virtualization Unit (RVU) on Marvell's OCTEON TX2 SoC maps HW
resources belonging to the network, crypto and other functional blocks onto
PCI-compatible physical and virtual functions.
Each functional block has multiple local functions (LFs) for
provisioning to different PCIe devices. RVU supports multiple PCIe SRIOV
physical functions (PFs) and virtual functions (VFs).
The :numref:`table_octeontx2_rvu_dpdk_mapping` shows the various local
functions (LFs) provided by the RVU and its functional mapping to
DPDK subsystem.
.. _table_octeontx2_rvu_dpdk_mapping:
.. table:: RVU managed functional blocks and its mapping to DPDK subsystem
+---+-----+--------------------------------------------------------------+
| # | LF | DPDK subsystem mapping |
+===+=====+==============================================================+
| 1 | NIX | rte_ethdev, rte_tm, rte_event_eth_[rt]x_adapter, rte_security|
+---+-----+--------------------------------------------------------------+
| 2 | NPA | rte_mempool |
+---+-----+--------------------------------------------------------------+
| 3 | NPC | rte_flow |
+---+-----+--------------------------------------------------------------+
| 4 | CPT | rte_cryptodev, rte_event_crypto_adapter |
+---+-----+--------------------------------------------------------------+
| 5 | SSO | rte_eventdev |
+---+-----+--------------------------------------------------------------+
| 6 | TIM | rte_event_timer_adapter |
+---+-----+--------------------------------------------------------------+
| 7 | LBK | rte_ethdev |
+---+-----+--------------------------------------------------------------+
| 8 | DPI | rte_rawdev |
+---+-----+--------------------------------------------------------------+
| 9 | SDP | rte_ethdev |
+---+-----+--------------------------------------------------------------+
| 10| REE | rte_regexdev |
+---+-----+--------------------------------------------------------------+
PF0 is called the administrative / admin function (AF) and has exclusive
privileges to provision RVU functional block's LFs to each of the PF/VF.
PF/VFs communicates with AF via a shared memory region (mailbox).Upon receiving
requests from PF/VF, AF does resource provisioning and other HW configuration.
AF is always attached to host, but PF/VFs may be used by host kernel itself,
or attached to VMs or to userspace applications like DPDK, etc. So, AF has to
handle provisioning/configuration requests sent by any device from any domain.
The AF driver does not receive or process any data.
It is only a configuration driver used in control path.
The :numref:`figure_octeontx2_resource_virtualization` diagram also shows a
resource provisioning example where,
1. PFx and PFx-VF0 bound to Linux netdev driver.
2. PFx-VF1 ethdev driver bound to the first DPDK application.
3. PFy ethdev driver, PFy-VF0 ethdev driver, PFz eventdev driver, PFm-VF0 cryptodev driver bound to the second DPDK application.
LBK HW Access
-------------
Loopback HW Unit (LBK) receives packets from NIX-RX and sends packets back to NIX-TX.
The loopback block has N channels and contains data buffering that is shared across
all channels. The LBK HW Unit is abstracted using ethdev subsystem, Where PF0's
VFs are exposed as ethdev device and odd-even pairs of VFs are tied together,
that is, packets sent on odd VF end up received on even VF and vice versa.
This would enable HW accelerated means of communication between two domains
where even VF bound to the first domain and odd VF bound to the second domain.
Typical application usage models are,
#. Communication between the Linux kernel and DPDK application.
#. Exception path to Linux kernel from DPDK application as SW ``KNI`` replacement.
#. Communication between two different DPDK applications.
SDP interface
-------------
System DPI Packet Interface unit(SDP) provides PCIe endpoint support for remote host
to DMA packets into and out of OCTEON TX2 SoC. SDP interface comes in to live only when
OCTEON TX2 SoC is connected in PCIe endpoint mode. It can be used to send/receive
packets to/from remote host machine using input/output queue pairs exposed to it.
SDP interface receives input packets from remote host from NIX-RX and sends packets
to remote host using NIX-TX. Remote host machine need to use corresponding driver
(kernel/user mode) to communicate with SDP interface on OCTEON TX2 SoC. SDP supports
single PCIe SRIOV physical function(PF) and multiple virtual functions(VF's). Users
can bind PF or VF to use SDP interface and it will be enumerated as ethdev ports.
The primary use case for SDP is to enable the smart NIC use case. Typical usage models are,
#. Communication channel between remote host and OCTEON TX2 SoC over PCIe.
#. Transfer packets received from network interface to remote host over PCIe and
vice-versa.
OCTEON TX2 packet flow
----------------------
The :numref:`figure_octeontx2_packet_flow_hw_accelerators` diagram depicts
the packet flow on OCTEON TX2 SoC in conjunction with use of various HW accelerators.
.. _figure_octeontx2_packet_flow_hw_accelerators:
.. figure:: img/octeontx2_packet_flow_hw_accelerators.*
OCTEON TX2 packet flow in conjunction with use of HW accelerators
HW Offload Drivers
------------------
This section lists dataplane H/W block(s) available in OCTEON TX2 SoC.
#. **Ethdev Driver**
See :doc:`../nics/octeontx2` for NIX Ethdev driver information.
#. **Mempool Driver**
See :doc:`../mempool/octeontx2` for NPA mempool driver information.
#. **Event Device Driver**
See :doc:`../eventdevs/octeontx2` for SSO event device driver information.
#. **DMA Rawdev Driver**
See :doc:`../rawdevs/octeontx2_dma` for DMA driver information.
#. **Crypto Device Driver**
See :doc:`../cryptodevs/octeontx2` for CPT crypto device driver information.
#. **Regex Device Driver**
See :doc:`../regexdevs/octeontx2` for REE regex device driver information.
Procedure to Setup Platform
---------------------------
There are three main prerequisites for setting up DPDK on OCTEON TX2
compatible board:
1. **OCTEON TX2 Linux kernel driver**
The dependent kernel drivers can be obtained from the
`kernel.org <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/marvell/octeontx2>`_.
Alternatively, the Marvell SDK also provides the required kernel drivers.
Linux kernel should be configured with the following features enabled:
.. code-block:: console
# 64K pages enabled for better performance
CONFIG_ARM64_64K_PAGES=y
CONFIG_ARM64_VA_BITS_48=y
# huge pages support enabled
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
# VFIO enabled with TYPE1 IOMMU at minimum
CONFIG_VFIO_IOMMU_TYPE1=y
CONFIG_VFIO_VIRQFD=y
CONFIG_VFIO=y
CONFIG_VFIO_NOIOMMU=y
CONFIG_VFIO_PCI=y
CONFIG_VFIO_PCI_MMAP=y
# SMMUv3 driver
CONFIG_ARM_SMMU_V3=y
# ARMv8.1 LSE atomics
CONFIG_ARM64_LSE_ATOMICS=y
# OCTEONTX2 drivers
CONFIG_OCTEONTX2_MBOX=y
CONFIG_OCTEONTX2_AF=y
# Enable if netdev PF driver required
CONFIG_OCTEONTX2_PF=y
# Enable if netdev VF driver required
CONFIG_OCTEONTX2_VF=y
CONFIG_CRYPTO_DEV_OCTEONTX2_CPT=y
# Enable if OCTEONTX2 DMA PF driver required
CONFIG_OCTEONTX2_DPI_PF=n
2. **ARM64 Linux Tool Chain**
For example, the *aarch64* Linaro Toolchain, which can be obtained from
`here <https://releases.linaro.org/components/toolchain/binaries/7.4-2019.02/aarch64-linux-gnu/>`_.
Alternatively, the Marvell SDK also provides GNU GCC toolchain, which is
optimized for OCTEON TX2 CPU.
3. **Rootfile system**
Any *aarch64* supporting filesystem may be used. For example,
Ubuntu 15.10 (Wily) or 16.04 LTS (Xenial) userland which can be obtained
from `<http://cdimage.ubuntu.com/ubuntu-base/releases/16.04/release/ubuntu-base-16.04.1-base-arm64.tar.gz>`_.
Alternatively, the Marvell SDK provides the buildroot based root filesystem.
The SDK includes all the above prerequisites necessary to bring up the OCTEON TX2 board.
- Follow the DPDK :doc:`../linux_gsg/index` to setup the basic DPDK environment.
Debugging Options
-----------------
.. _table_octeontx2_common_debug_options:
.. table:: OCTEON TX2 common debug options
+---+------------+-------------------------------------------------------+
| # | Component | EAL log command |
+===+============+=======================================================+
| 1 | Common | --log-level='pmd\.octeontx2\.base,8' |
+---+------------+-------------------------------------------------------+
| 2 | Mailbox | --log-level='pmd\.octeontx2\.mbox,8' |
+---+------------+-------------------------------------------------------+
Debugfs support
~~~~~~~~~~~~~~~
The **OCTEON TX2 Linux kernel driver** provides support to dump RVU blocks
context or stats using debugfs.
Enable ``debugfs`` by:
1. Compile kernel with debugfs enabled, i.e ``CONFIG_DEBUGFS=y``.
2. Boot OCTEON TX2 with debugfs supported kernel.
3. Verify ``debugfs`` mounted by default "mount | grep -i debugfs" or mount it manually by using.
.. code-block:: console
# mount -t debugfs none /sys/kernel/debug
Currently ``debugfs`` supports the following RVU blocks NIX, NPA, NPC, NDC,
SSO & CGX.
The file structure under ``/sys/kernel/debug`` is as follows
.. code-block:: console
octeontx2/
|-- cgx
| |-- cgx0
| | '-- lmac0
| | '-- stats
| |-- cgx1
| | |-- lmac0
| | | '-- stats
| | '-- lmac1
| | '-- stats
| '-- cgx2
| '-- lmac0
| '-- stats
|-- cpt
| |-- cpt_engines_info
| |-- cpt_engines_sts
| |-- cpt_err_info
| |-- cpt_lfs_info
| '-- cpt_pc
|---- nix
| |-- cq_ctx
| |-- ndc_rx_cache
| |-- ndc_rx_hits_miss
| |-- ndc_tx_cache
| |-- ndc_tx_hits_miss
| |-- qsize
| |-- rq_ctx
| |-- sq_ctx
| '-- tx_stall_hwissue
|-- npa
| |-- aura_ctx
| |-- ndc_cache
| |-- ndc_hits_miss
| |-- pool_ctx
| '-- qsize
|-- npc
| |-- mcam_info
| '-- rx_miss_act_stats
|-- rsrc_alloc
'-- sso
|-- hws
| '-- sso_hws_info
'-- hwgrp
|-- sso_hwgrp_aq_thresh
|-- sso_hwgrp_iaq_walk
|-- sso_hwgrp_pc
|-- sso_hwgrp_free_list_walk
|-- sso_hwgrp_ient_walk
'-- sso_hwgrp_taq_walk
RVU block LF allocation:
.. code-block:: console
cat /sys/kernel/debug/octeontx2/rsrc_alloc
pcifunc NPA NIX SSO GROUP SSOWS TIM CPT
PF1 0 0
PF4 1
PF13 0, 1 0, 1 0
CGX example usage:
.. code-block:: console
cat /sys/kernel/debug/octeontx2/cgx/cgx2/lmac0/stats
=======Link Status======
Link is UP 40000 Mbps
=======RX_STATS======
Received packets: 0
Octets of received packets: 0
Received PAUSE packets: 0
Received PAUSE and control packets: 0
Filtered DMAC0 (NIX-bound) packets: 0
Filtered DMAC0 (NIX-bound) octets: 0
Packets dropped due to RX FIFO full: 0
Octets dropped due to RX FIFO full: 0
Error packets: 0
Filtered DMAC1 (NCSI-bound) packets: 0
Filtered DMAC1 (NCSI-bound) octets: 0
NCSI-bound packets dropped: 0
NCSI-bound octets dropped: 0
=======TX_STATS======
Packets dropped due to excessive collisions: 0
Packets dropped due to excessive deferral: 0
Multiple collisions before successful transmission: 0
Single collisions before successful transmission: 0
Total octets sent on the interface: 0
Total frames sent on the interface: 0
Packets sent with an octet count < 64: 0
Packets sent with an octet count == 64: 0
Packets sent with an octet count of 65127: 0
Packets sent with an octet count of 128-255: 0
Packets sent with an octet count of 256-511: 0
Packets sent with an octet count of 512-1023: 0
Packets sent with an octet count of 1024-1518: 0
Packets sent with an octet count of > 1518: 0
Packets sent to a broadcast DMAC: 0
Packets sent to the multicast DMAC: 0
Transmit underflow and were truncated: 0
Control/PAUSE packets sent: 0
CPT example usage:
.. code-block:: console
cat /sys/kernel/debug/octeontx2/cpt/cpt_pc
CPT instruction requests 0
CPT instruction latency 0
CPT NCB read requests 0
CPT NCB read latency 0
CPT read requests caused by UC fills 0
CPT active cycles pc 1395642
CPT clock count pc 5579867595493
NIX example usage:
.. code-block:: console
Usage: echo <nixlf> [cq number/all] > /sys/kernel/debug/octeontx2/nix/cq_ctx
cat /sys/kernel/debug/octeontx2/nix/cq_ctx
echo 0 0 > /sys/kernel/debug/octeontx2/nix/cq_ctx
cat /sys/kernel/debug/octeontx2/nix/cq_ctx
=====cq_ctx for nixlf:0 and qidx:0 is=====
W0: base 158ef1a00
W1: wrptr 0
W1: avg_con 0
W1: cint_idx 0
W1: cq_err 0
W1: qint_idx 0
W1: bpid 0
W1: bp_ena 0
W2: update_time 31043
W2:avg_level 255
W2: head 0
W2:tail 0
W3: cq_err_int_ena 5
W3:cq_err_int 0
W3: qsize 4
W3:caching 1
W3: substream 0x000
W3: ena 1
W3: drop_ena 1
W3: drop 64
W3: bp 0
NPA example usage:
.. code-block:: console
Usage: echo <npalf> [pool number/all] > /sys/kernel/debug/octeontx2/npa/pool_ctx
cat /sys/kernel/debug/octeontx2/npa/pool_ctx
echo 0 0 > /sys/kernel/debug/octeontx2/npa/pool_ctx
cat /sys/kernel/debug/octeontx2/npa/pool_ctx
======POOL : 0=======
W0: Stack base 1375bff00
W1: ena 1
W1: nat_align 1
W1: stack_caching 1
W1: stack_way_mask 0
W1: buf_offset 1
W1: buf_size 19
W2: stack_max_pages 24315
W2: stack_pages 24314
W3: op_pc 267456
W4: stack_offset 2
W4: shift 5
W4: avg_level 255
W4: avg_con 0
W4: fc_ena 0
W4: fc_stype 0
W4: fc_hyst_bits 0
W4: fc_up_crossing 0
W4: update_time 62993
W5: fc_addr 0
W6: ptr_start 1593adf00
W7: ptr_end 180000000
W8: err_int 0
W8: err_int_ena 7
W8: thresh_int 0
W8: thresh_int_ena 0
W8: thresh_up 0
W8: thresh_qint_idx 0
W8: err_qint_idx 0
NPC example usage:
.. code-block:: console
cat /sys/kernel/debug/octeontx2/npc/mcam_info
NPC MCAM info:
RX keywidth : 224bits
TX keywidth : 224bits
MCAM entries : 2048
Reserved : 158
Available : 1890
MCAM counters : 512
Reserved : 1
Available : 511
SSO example usage:
.. code-block:: console
Usage: echo [<hws>/all] > /sys/kernel/debug/octeontx2/sso/hws/sso_hws_info
echo 0 > /sys/kernel/debug/octeontx2/sso/hws/sso_hws_info
==================================================
SSOW HWS[0] Arbitration State 0x0
SSOW HWS[0] Guest Machine Control 0x0
SSOW HWS[0] SET[0] Group Mask[0] 0xffffffffffffffff
SSOW HWS[0] SET[0] Group Mask[1] 0xffffffffffffffff
SSOW HWS[0] SET[0] Group Mask[2] 0xffffffffffffffff
SSOW HWS[0] SET[0] Group Mask[3] 0xffffffffffffffff
SSOW HWS[0] SET[1] Group Mask[0] 0xffffffffffffffff
SSOW HWS[0] SET[1] Group Mask[1] 0xffffffffffffffff
SSOW HWS[0] SET[1] Group Mask[2] 0xffffffffffffffff
SSOW HWS[0] SET[1] Group Mask[3] 0xffffffffffffffff
==================================================
Compile DPDK
------------
DPDK may be compiled either natively on OCTEON TX2 platform or cross-compiled on
an x86 based platform.
Native Compilation
~~~~~~~~~~~~~~~~~~
.. code-block:: console
meson build
ninja -C build
Cross Compilation
~~~~~~~~~~~~~~~~~
Refer to :doc:`../linux_gsg/cross_build_dpdk_for_arm64` for generic arm64 details.
.. code-block:: console
meson build --cross-file config/arm/arm64_octeontx2_linux_gcc
ninja -C build
.. note::
By default, meson cross compilation uses ``aarch64-linux-gnu-gcc`` toolchain,
if Marvell toolchain is available then it can be used by overriding the
c, cpp, ar, strip ``binaries`` attributes to respective Marvell
toolchain binaries in ``config/arm/arm64_octeontx2_linux_gcc`` file.