X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Feventdevs%2Focteontx2.rst;h=6502f6415fb4f4a0f66e81131b93312a0e64c1a2;hb=c5a4428a783d173721ad0ed5486d058976737af8;hp=341c5b21dd9f151916a00d00a37db7bd1930f23d;hpb=3ef6bbfeadb89191dda296c07afb35c7c971dd07;p=dpdk.git diff --git a/doc/guides/eventdevs/octeontx2.rst b/doc/guides/eventdevs/octeontx2.rst index 341c5b21dd..6502f6415f 100644 --- a/doc/guides/eventdevs/octeontx2.rst +++ b/doc/guides/eventdevs/octeontx2.rst @@ -28,6 +28,16 @@ Features of the OCTEON TX2 SSO PMD are: - 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 --------------------------------------- @@ -46,6 +56,108 @@ The following option can be modified in the ``config`` file. 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 ~~~~~~~~~~~~~~~~~ @@ -58,3 +170,5 @@ Debugging Options +===+============+=======================================================+ | 1 | SSO | --log-level='pmd\.event\.octeontx2,8' | +---+------------+-------------------------------------------------------+ + | 2 | TIM | --log-level='pmd\.event\.octeontx2\.timer,8' | + +---+------------+-------------------------------------------------------+