Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 174 insertions, 0 deletions

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+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2019 Marvell International Ltd.
+
+OCTEON TX2 SSO Eventdev Driver
+===============================
+
+The OCTEON TX2 SSO PMD (**librte_pmd_octeontx2_event**) provides poll mode
+eventdev driver support for the inbuilt event device found in the **Marvell OCTEON TX2**
+SoC family.
+
+More information about OCTEON TX2 SoC can be found at `Marvell Official Website
+<https://www.marvell.com/embedded-processors/infrastructure-processors/>`_.
+
+Features
+--------
+
+Features of the OCTEON TX2 SSO PMD are:
+
+- 256 Event queues
+- 26 (dual) and 52 (single) Event ports
+- HW event scheduler
+- Supports 1M flows per event queue
+- Flow based event pipelining
+- Flow pinning support in flow based event pipelining
+- Queue based event pipelining
+- Supports ATOMIC, ORDERED, PARALLEL schedule types per flow
+- Event scheduling QoS based on event queue priority
+- Open system with configurable amount of outstanding events limited only by
+  DRAM
+- HW accelerated dequeue timeout support to enable power management
+- HW managed event timers support through TIM, with high precision and
+  time granularity of 2.5us.
+- Up to 256 TIM rings aka event timer adapters.
+- Up to 8 rings traversed in parallel.
+- HW managed packets enqueued from ethdev to eventdev exposed through event eth
+  RX adapter.
+- N:1 ethernet device Rx queue to Event queue mapping.
+- Lockfree Tx from event eth Tx adapter using ``DEV_TX_OFFLOAD_MT_LOCKFREE``
+  capability while maintaining receive packet order.
+- Full Rx/Tx offload support defined through ethdev queue config.
+
+Prerequisites and Compilation procedure
+---------------------------------------
+
+   See :doc:`../platform/octeontx2` for setup information.
+
+Pre-Installation Configuration
+------------------------------
+
+Compile time Config Options
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following option can be modified in the ``config`` file.
+
+- ``CONFIG_RTE_LIBRTE_PMD_OCTEONTX2_EVENTDEV`` (default ``y``)
+
+  Toggle compilation of the ``librte_pmd_octeontx2_event`` driver.
+
+Runtime Config Options
+~~~~~~~~~~~~~~~~~~~~~~
+
+- ``Maximum number of in-flight events`` (default ``8192``)
+
+  In **Marvell OCTEON TX2** the max number of in-flight events are only limited
+  by DRAM size, the ``xae_cnt`` devargs parameter is introduced to provide
+  upper limit for in-flight events.
+  For example::
+
+    -w 0002:0e:00.0,xae_cnt=16384
+
+- ``Force legacy mode``
+
+  The ``single_ws`` devargs parameter is introduced to force legacy mode i.e
+  single workslot mode in SSO and disable the default dual workslot mode.
+  For example::
+
+    -w 0002:0e:00.0,single_ws=1
+
+- ``Event Group QoS support``
+
+  SSO GGRPs i.e. queue uses DRAM & SRAM buffers to hold in-flight
+  events. By default the buffers are assigned to the SSO GGRPs to
+  satisfy minimum HW requirements. SSO is free to assign the remaining
+  buffers to GGRPs based on a preconfigured threshold.
+  We can control the QoS of SSO GGRP by modifying the above mentioned
+  thresholds. GGRPs that have higher importance can be assigned higher
+  thresholds than the rest. The dictionary format is as follows
+  [Qx-XAQ-TAQ-IAQ][Qz-XAQ-TAQ-IAQ] expressed in percentages, 0 represents
+  default.
+  For example::
+
+    -w 0002:0e:00.0,qos=[1-50-50-50]
+
+- ``Selftest``
+
+  The functionality of OCTEON TX2 eventdev can be verified using this option,
+  various unit and functional tests are run to verify the sanity.
+  The tests are run once the vdev creation is successfully complete.
+  For example::
+
+    -w 0002:0e:00.0,selftest=1
+
+- ``TIM disable NPA``
+
+  By default chunks are allocated from NPA then TIM can automatically free
+  them when traversing the list of chunks. The ``tim_disable_npa`` devargs
+  parameter disables NPA and uses software mempool to manage chunks
+  For example::
+
+    -w 0002:0e:00.0,tim_disable_npa=1
+
+- ``TIM modify chunk slots``
+
+  The ``tim_chnk_slots`` devargs can be used to modify number of chunk slots.
+  Chunks are used to store event timers, a chunk can be visualised as an array
+  where the last element points to the next chunk and rest of them are used to
+  store events. TIM traverses the list of chunks and enqueues the event timers
+  to SSO. The default value is 255 and the max value is 4095.
+  For example::
+
+    -w 0002:0e:00.0,tim_chnk_slots=1023
+
+- ``TIM enable arm/cancel statistics``
+
+  The ``tim_stats_ena`` devargs can be used to enable arm and cancel stats of
+  event timer adapter.
+  For example::
+
+    -w 0002:0e:00.0,tim_stats_ena=1
+
+- ``TIM limit max rings reserved``
+
+  The ``tim_rings_lmt`` devargs can be used to limit the max number of TIM
+  rings i.e. event timer adapter reserved on probe. Since, TIM rings are HW
+  resources we can avoid starving other applications by not grabbing all the
+  rings.
+  For example::
+
+    -w 0002:0e:00.0,tim_rings_lmt=5
+
+- ``TIM ring control internal parameters``
+
+  When using multiple TIM rings the ``tim_ring_ctl`` devargs can be used to
+  control each TIM rings internal parameters uniquely. The following dict
+  format is expected [ring-chnk_slots-disable_npa-stats_ena]. 0 represents
+  default values.
+  For Example::
+
+    -w 0002:0e:00.0,tim_ring_ctl=[2-1023-1-0]
+
+- ``Lock NPA contexts in NDC``
+
+   Lock NPA aura and pool contexts in NDC cache.
+   The device args take hexadecimal bitmask where each bit represent the
+   corresponding aura/pool id.
+
+   For example::
+
+      -w 0002:0e:00.0,npa_lock_mask=0xf
+
+Debugging Options
+~~~~~~~~~~~~~~~~~
+
+.. _table_octeontx2_event_debug_options:
+
+.. table:: OCTEON TX2 event device debug options
+
+   +---+------------+-------------------------------------------------------+
+   | # | Component  | EAL log command                                       |
+   +===+============+=======================================================+
+   | 1 | SSO        | --log-level='pmd\.event\.octeontx2,8'                 |
+   +---+------------+-------------------------------------------------------+
+   | 2 | TIM        | --log-level='pmd\.event\.octeontx2\.timer,8'          |
+   +---+------------+-------------------------------------------------------+