From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id E0F71A2EEB for ; Tue, 10 Sep 2019 17:35:21 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 931E81EF5C; Tue, 10 Sep 2019 17:35:21 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id 2BEB71EF50 for ; Tue, 10 Sep 2019 17:35:18 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Sep 2019 08:35:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,489,1559545200"; d="scan'208";a="184202444" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.4]) ([10.237.221.4]) by fmsmga008.fm.intel.com with ESMTP; 10 Sep 2019 08:35:16 -0700 To: "Wang, Haiyue" , "Richardson, Bruce" Cc: Ray Kinsella , "dev@dpdk.org" , "Sun, Chenmin" References: <1565665572-65495-1-git-send-email-haiyue.wang@intel.com> <1565665572-65495-2-git-send-email-haiyue.wang@intel.com> <20190812202436.662e6ca8@hermes.lan> <75f88e4b-97ca-7e1f-1385-8e69f659be7f@intel.com> <20190909124038.GA1889@bricha3-MOBL.ger.corp.intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [RFC v2 1/3] ethdev: add the API for getting trace information X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 9/10/2019 4:21 PM, Wang, Haiyue wrote: >> -----Original Message----- >> From: Yigit, Ferruh >> Sent: Tuesday, September 10, 2019 23:07 >> To: Wang, Haiyue ; Richardson, Bruce >> Cc: Ray Kinsella ; dev@dpdk.org; Sun, Chenmin >> Subject: Re: [dpdk-dev] [RFC v2 1/3] ethdev: add the API for getting trace information >> >> On 9/10/2019 5:36 AM, Wang, Haiyue wrote: >>> Thanks Ferruh, Bruce. >>> >>>> -----Original Message----- >>>> From: Yigit, Ferruh >>>> Sent: Monday, September 9, 2019 21:18 >>>> To: Richardson, Bruce >>>> Cc: Wang, Haiyue ; Ray Kinsella ; dev@dpdk.org; Sun, Chenmin >>>> >>>> Subject: Re: [dpdk-dev] [RFC v2 1/3] ethdev: add the API for getting trace information >>>> >>>> On 9/9/2019 1:50 PM, Ferruh Yigit wrote: >>>>> On 9/9/2019 1:40 PM, Bruce Richardson wrote: >>>>>> On Mon, Sep 09, 2019 at 12:23:36PM +0100, Ferruh Yigit wrote: >>>>>>> On 9/7/2019 3:42 AM, Wang, Haiyue wrote: >>>>>>>>> -----Original Message----- >>>>>>>>> From: Yigit, Ferruh >>>>>>>>> Sent: Friday, September 6, 2019 22:22 >>>>>>>>> To: Ray Kinsella ; Wang, Haiyue >>>>>>>>> Cc: dev@dpdk.org >>>>>>>>> Subject: Re: [dpdk-dev] [RFC v2 1/3] ethdev: add the API for getting trace information >>>>>>>>> >>>>>>>>> On 8/13/2019 1:51 PM, Ray Kinsella wrote: >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On 13/08/2019 04:24, Stephen Hemminger wrote: >>>>>>>>>>> On Tue, 13 Aug 2019 11:06:10 +0800 >>>>>>>>>>> Haiyue Wang wrote: >>>>>>>>>>> >>>>>>>>>>>> Enhance the PMD to support retrieving trace information like >>>>>>>>>>>> Rx/Tx burst selection etc. >>>>>>>>>>>> >>>>>>>>>>>> Signed-off-by: Haiyue Wang >>>>>>>>>>>> --- >>>>>>>>>>>> lib/librte_ethdev/rte_ethdev.c | 18 ++++++++++++++++++ >>>>>>>>>>>> lib/librte_ethdev/rte_ethdev.h | 9 +++++++++ >>>>>>>>>>>> lib/librte_ethdev/rte_ethdev_core.h | 4 ++++ >>>>>>>>>>>> 3 files changed, 31 insertions(+) >>>>>>>>>>>> >>>>>>>>>>>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c >>>>>>>>>>>> index 17d183e..6098fad 100644 >>>>>>>>>>>> --- a/lib/librte_ethdev/rte_ethdev.c >>>>>>>>>>>> +++ b/lib/librte_ethdev/rte_ethdev.c >>>>>>>>>>>> @@ -4083,6 +4083,24 @@ rte_eth_tx_queue_info_get(uint16_t port_id, uint16_t queue_id, >>>>>>>>>>>> } >>>>>>>>>>>> >>>>>>>>>>>> int >>>>>>>>>>>> +rte_eth_trace_info_get(uint16_t port_id, uint16_t queue_id, >>>>>>>>>>>> + enum rte_eth_trace type, char *buf, int sz) >>>>>>>>> >>>>>>>>> Better to use struct as argument instead of individual variables because it is >>>>>>>>> easier to extend the struct later if needed. >>>>>>>>> >>>>>>>>>>>> +{ >>>>>>>>>>>> + struct rte_eth_dev *dev; >>>>>>>>>>>> + >>>>>>>>>>>> + RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV); >>>>>>>>>>>> + >>>>>>>>>>>> + if (buf == NULL) >>>>>>>>>>>> + return -EINVAL; >>>>>>>>>>>> + >>>>>>>>>>>> + dev = &rte_eth_devices[port_id]; >>>>>>>>>>>> + >>>>>>>>>>>> + RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->trace_info_get, -ENOTSUP); >>>>>>>>>>>> + >>>>>>>>>>>> + return dev->dev_ops->trace_info_get(dev, queue_id, type, buf, sz); >>>>>>>>>>> >>>>>>>>>>> What if queueid is out of bounds? >>>>>>>>>>> >>>>>>>>>>> The bigger problem is that this information is like a log message >>>>>>>>>>> and unstructured, which makes it device specific and useless for automation. >>>>>>>>>> >>>>>>>>>> IMHO - this is much better implemented as a capability bitfield, that >>>>>>>>>> can be queried. >>>>>>>>> >>>>>>>>> +1 to return the datapath capability as bitfield. >>>>>>>>> >>>>>>>>> Also +1 to have a new API, >>>>>>>>> - I am not sure about the API name, 'rte_eth_trace_info_get()', can we find >>>>>>>>> something better instead of 'trace' there. >>>>>>>>> - I think we should limit this API only to get current datapath configuration, >>>>>>>>> for clarity of the API don't return capability or not datapath related config. >>>>>>>>> >>>>>>>>> Also this information not always supported in queue level, what do you think >>>>>>>>> having ability to get this information in port level, >>>>>>>>> like this API can return a struct, which may have a field that says if the >>>>>>>>> output is for queue or port, or this can be another bitfield, what do you think? >>>>>>>>> >>>>>>>> >>>>>>>> #define RX_SCALAR (1ULL < 0) >>>>>>>> #define RX_VECTOR_AVX2 ... >>>>>>> >>>>>>> What about having RX_VECTOR value, later another bit group for the details of >>>>>>> the vectorization: >>>>>>> SSE >>>>>>> AVX2 >>>>>>> AVX512 >>>>>>> NEON >>>>>>> ALTIVEC >>>>>>> >>>>>>> Since above options can exist together, what about using values for them instead >>>>>>> of bitfields? Reserving 4 bits, 2^4 = 16, can be enough I think for long term. >>>>>>> >>>>>> Rather than having named vector types, we just need to worry about the ones >>>>>> for the current architecture. Therefore I'd suggest just using vector >>>>>> widths, one bit each for 16B, 32B and 64B vector support. For supporting >>>>>> multiple values, 16 combinations is not enough for all the possibilities. >>>>>> >>>>> >>>>> vector width can be an option too, no objection there. But this is only for >>>>> current configuration, so it can be a combination, we have now 5 types and >>>>> allocating space for 16. >>>>> >>>> >>>> correction: it can *not* be a combination >>> >>> I think we can merge the RX_VECTOR and TX_VECTOR together, use 6 bits for vector >>> mode detail. And for vector width, the SSE, NEON name should indicates it ? >>> >>> I renamed the definitions to try to make things clear. >>> >>> enum rte_eth_burst_mode_option { >>> BURST_SCALAR = (1 << 0), >>> BURST_VECTOR = (1 << 1), >>> >>> BURST_VECTOR_MODE_MASK = (0x3F << 2), >>> BURST_ALTIVEC = (1 << 2), >>> BURST_NEON = (2 << 2), >>> BURST_SSE = (3 << 2), >>> BURST_AVX2 = (4 << 2), >>> BURST_AVX512 = (5 << 2), >>> >>> BURST_SCATTERED = (1 << 8), >>> BURST_BULK_ALLOC = (1 << 9), >>> BURST_NORMAL = (1 << 10), >>> BURST_SIMPLE = (1 << 11), >>> }; >>> >>> /** >>> * Ethernet device RX/TX queue packet burst mode information structure. >>> * Used to retrieve information about packet burst mode setting. >>> */ >>> struct rte_eth_burst_mode { >>> uint32_t per_queue_support:1; /**< Support to set per queue burst */ >>> >>> uint64_t options; >> >> We are using first 32bits just to detect the queue level support, what do you >> think converting this into a field in 'rte_eth_burst_mode_option' and use >> 'options' fields, so we will fit into 64 bit. > > Yes, it's clear. > Then do we still use 'struct rte_eth_burst_mode' to hold one member "uint64_t options" ? > > struct rte_eth_burst_mode { > uint64_t options; > }; > I suggest keeping the struct, for the possibility of future changes.