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Reasons should be >>>>>>>>>>> really strong to change existing defaults. >>>>>>>>>> >>>>>>>>>> The only reason is, typically testpmd will be used performance >>>>>>>>>> benchmarking as an industry standard. It is difficult to >>>>>>>>>> tell/educate >>>>>>>>>> the QA or customers >>>>>>>>>> that, "BTW if you need to get better performance add more flag to >>>>>>>>>> testpmd command line". >>>>>>>> >>>>>>>> I disagree. >>>>>>>> When you do performance benchmark, you tune settings accordingly. >>>>>>> >>>>>>> IMO, We tune the system resources like queue depth not the disabling >>>>>>> features for raw performance. >>>>>>> queue depth etc people know to tune so it is obvious. What is not >>>>>>> obvious is, testpmd only >>>>>>> negotiated some features by default.I am not using that feature, >>>>>>> hence >>>>>>> I need to explicitly >>>>>>> disable it. >>>>>>> >>>>>> >>>>>> When 'rte_eth_rx_metadata_negotiate()' API is NOT used at all, and I >>>>>> believe that is the case for almost all applications since API is a >>>>>> relatively new one, PMD default behavior should be to enable Rx >>>>>> metadata >>>>>> flow rules, in case user requests them later. >>>>>> >>>>>> So, enabling all in application is same with not calling the API >>>>>> at all. >>>>>> >>>>>> In this perspective, disabling Rx metadata is additional >>>>>> optimization/tuning that application can do if it is sure that Rx >>>>>> metadata flow rules won't be used at all. >>>>>> And API is more meaningful when it is used to disable Rx metadata. >>>>>> >>>>>> I think it is reasonable to enable all Rx metadata by default in >>>>>> testpmd >>>>>> with a capability to disable it when wanted. >>>>>> >>>>>> OR >>>>>> >>>>>> May be we don't call 'rte_eth_rx_metadata_negotiate()' API by >>>>>> default in >>>>>> testpmd, it is only called when it is requested explicitly from user, >>>>>> enable or disable. >>>>> >>>>> Second option looks good to me. >>>>> When >>>>> 1) user request for action which is needed negotiate(), >>>>> AND >>>>> 2) rte_eth_rx_metadata_negotiate() != ENOSUP >>>>> then, testpmd print a warning that need to enable >>>>> rte_eth_rx_metadata_negotiate(). >>>>> >>>> >>>> We are not suggesting same thing. >>>> >>>> What you described above assumes PMD disabled Rx metadata flow rule >>>> support by default, and it needs to be enabled explicitly by >>>> 'rte_eth_rx_metadata_negotiate()' API. This API becomes mandatory for >>>> functionality. >>>> >>>> As far as I understand PMD wants to disable this flow rule by default >>>> because of performance concerns. But this creates inconsistency between >>>> PMDs, because rest of them will enable this flow rule by default (if it >>>> is supported) and be ready to use it when proper flow rule created. >>>> >>>> With this approach some PMDs will need >>>> 'rte_eth_rx_metadata_negotiate()' >>>> to enable Rx metadata flow rules, some won't. This can be confusing for >>>> applications that *some* PMDs require double enabling with specific API >>>> call. >>>> >>>> >>>> Instead what I was trying to suggest is reverse, >>>> all PMDs enable the Rx metadata flow rule by default, and don't require >>>> double enabling. >>>> But if application knows that it won't use Rx metadata flow rule, it >>>> can >>>> disable it to optimize the performance. >>>> This makes 'rte_eth_rx_metadata_negotiate()' functionally optional, and >>>> for testpmd context it can be called via a command on demand by user >>>> for >>>> optimization purpose. >>> >>> This won't solve concern I have outlined earlier[1]. >>> >> >> Yes, it won't. >> >>> I think, The part of the problem there is no enough adaption of >>> rte_eth_rx_metadata_negotiate(), >>> >>> The view is total different from PMD maintainer PoV vs testpmd >>> application PoV. >>> >> >> Agree, >> and I assume it is different for user application too, which may >> prioritize consistency and portability. >> >> Overall, I am not fan of the 'rte_eth_rx_metadata_negotiate()' API, I >> think it is confusing. > > Forgive me, in which way is it confusing? > All other flow rules enabled by creating flow rule, but this one requires an API to enable it, so I believe it is inconsistent in that way. >From application perspective, assume that it doesn't know NIC details, should it call this API or not? Without API call should application assume Rx metadata flow rules are enabled or disabled? As I understand intention is to get hint from application if it will require Rx metadata flow rules so that PMD can optimize better, but if PMD doesn't enable Rx metadata flow rules when this API call is missing than it becomes a mandatory API to configure the device. But I think it should be optional for optimization. Also if application not sure to use this flow rule or not, it will by default enable all in any case, this will reduce the benefit. As done in testpmd. API works in both ways, it request to enable some Rx metadata flow rule, but based on what PMD returns application can know what device supports, this also inconsistent with how other flow rules work, we don't have API to get capability but detect them via flow create/validate. Can there be a case API returns a flow rule negotiated, but it fails when tried to create the flow rule, isn't this confusing for application I think if we continue this approach there can be multiple enable and capability learning APIs for various flow rules or flow rule groups, and this can make flow API much more harder to use for applications. >> >>> Just to avoid back and forth. We will call off this patch and remove >>> rte_eth_rx_metadata_negotiate() >>> PMD callback from cnxk driver. Keep it as old behavior, so we don't >>> need to care >>> about rte_eth_rx_metadata_negotiate(). >>> >> >> When you remove 'rx_metadata_negotiate' callback, what will be the PMD >> behavior? I assume PMD will do the required preparations as if all Rx >> metadata is enabled. >> And what is the performance impact, is removing callback improve the >> performance? >> >> >>> [1] >>> The only reason is, typically testpmd will be used performance >>> benchmarking as an industry standard. It is difficult to tell/educate >>> the QA or customers >>> that, "BTW if you need to get better performance add more flag to >>> testpmd command line". >>> To make that worst, only some PMD needs to give the additional >>> parameter to get better number. >>> And also, testpmd usage will be treated as application modeling. >>> >>>> >>>> >>>> >>>> >>>>> >>>>>>> >>>>>>>> >>>>>>>>>> To make that worst, only some PMD needs to give the additional >>>>>>>>>> parameter to get better number. >>>>>>>>>> And also, testpmd usage will be treated as application modeling. >>>>>>>>>> >>>>>>>>>> Since this feature only used on sfc and cnxk driver, What is the >>>>>>>>>> situation with sfc driver? >>>>>>>>>> Keeping it as negotiated and not use the feature, will impact >>>>>>>>>> the per >>>>>>>>>> core performance of sfc or >>>>>>>>>> is it just PCI bandwidth thing which really dont show any >>>>>>>>>> difference in testpmd? >>>>>>>>> >>>>>>>>> Yes, sfc could run faster if no Rx metadata are negotiated. So, >>>>>>>>> it is better to negotiate nothing by default. But it is always >>>>>>>>> painful to change defaults. You need to explain that now you >>>>>>>>> need to negotiate Rx metadata to use mark, flag and tunnel >>>>>>>>> offloads. >>>>>>>>> Yes, it will be required on sfc and cnxk only. >>>>>>>>> As an sfc maintainer I don't mind to change testpmd defaults. >>>>>>>> >>>>>>>> If we change testpmd defaults to "do nothing", >>>>>>>> then we should disable MBUF_FAST_FREE as well. >>>>>>> >>>>>>> if you see MBUF_FAST_FREE, it does nothing. Actually, >>>>>>> !MBUF_FAST_FREE is doing more work. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> >>>>>> >>>> >> >>