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 6B303A2EEB for ; Tue, 10 Sep 2019 17:33:51 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id F395C1EDCF; Tue, 10 Sep 2019 17:33:49 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id 958721EB2E for ; Tue, 10 Sep 2019 17:33:47 +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 orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Sep 2019 08:33:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,489,1559545200"; d="scan'208";a="184201931" 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 08:33:44 -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> <8268b844-2815-5e0d-87cf-c6e9ca5c9f34@intel.com> <4672dfa1-a553-28fc-686e-1e14186a040a@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: 7bit 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 4:17 PM, Wang, Haiyue wrote: >> -----Original Message----- >> From: Yigit, Ferruh >> Sent: Tuesday, September 10, 2019 23:00 >> 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 12:41 PM, Wang, Haiyue wrote: >>>> -----Original Message----- >>>> From: Yigit, Ferruh >>>> Sent: Tuesday, September 10, 2019 17:15 >>>> 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 9:37 AM, Wang, Haiyue wrote: >>>>>> -----Original Message----- >>>>>> From: Yigit, Ferruh >>>>>> Sent: Tuesday, September 10, 2019 16:07 >>>>>> 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), >>>>>> >>>>>> Do we need to have bitfields for this, I was suggesting reserve 4 bits, bit 2-5 >>>>>> (inclusive) and use their value: >>>>>> >>>>>> BURST_VECTOR_MODE_IDX = 2 >>>>>> BURST_VECTOR_MODE_SIZE = 4 >>>>>> BURST_VECTOR_MODE_MASK = >>>>>> ((1 << BURST_VECTOR_MODE_SIZE) - 1) << BURST_VECTOR_MODE_IDX >>>>>> >>>>>> vector_mode = (options & BURST_VECTOR_MODE_MASK) >> BURST_VECTOR_MODE_IDX >>>>>> >>>>>> if (vector_mode == 0) // BURST_SSE >>>>>> if (vector_mode == 1) // BURST_AVX2 >>>>>> if (vector_mode == 2) // BURST_AVX512 >>>>>> if (vector_mode == 3) // BURST_NEON >>>>>> .... >>>>>> >>>>>> Can any vector mode be combination of above, if not why use bitfields? >>>>>> >>>>> >>>>> I use it as this to *set* ... >>>>> >>>>> else if (pkt_burst == i40e_recv_scattered_pkts_vec_avx2) >>>>> options = BURST_VECTOR | BURST_AVX2 | BURST_SCATTERED; >>>>> else if (pkt_burst == i40e_recv_pkts_vec_avx2) >>>>> options = BURST_VECTOR | BURST_AVX2; >>>>> else if (pkt_burst == i40e_recv_scattered_pkts_vec) >>>>> options = BURST_VECTOR | BURST_SSE | BURST_SCATTERED; >>>>> else if (pkt_burst == i40e_recv_pkts_vec) >>>>> options = BURST_VECTOR | BURST_SSE; >>>>> >>>>> Then *get* like this, since we reserve the bit group. >>>>> >>>>> static void >>>>> burst_mode_options_display(uint64_t options) >>>>> { >>>>> uint64_t vec_mode = options & BURST_VECTOR_MODE_MASK; >>>>> uint64_t opt; >>>>> >>>>> options &= ~BURST_VECTOR_MODE_MASK; >>>>> >>>>> for (opt = 1; options != 0; opt <<= 1, options >>= 1) { >>>>> if (!(options & 1)) >>>>> continue; >>>>> >>>>> printf(" %s", rte_eth_burst_mode_option_name(opt)); >>>>> >>>>> if (opt == BURST_VECTOR) >>>>> printf("(%s)", >>>>> rte_eth_burst_mode_option_name(vec_mode)); >>>>> } >>>>> } >>>>> >>>> >>>> I can see how you intended use it, only they don't need to be bitfield and using >>>> with value saves bits. >>>> Also I think good to reserve some bits for future modes. >>>> >>> >>> "BURST_VECTOR_MODE_MASK = (0x3F << 2)" has reserved 63 non-zero bits on position 2 ~ 7. >>> Then from bit 8, a new definition: BURST_SCATTERED = (1 << 8). >>> >>> "using with value saves bits" -- Sorry, I didn't get the point. :-( >>> vector_mode = (options & BURST_VECTOR_MODE_MASK) >> BURST_VECTOR_MODE_IDX >>> >>> From above, 'vector_mode's bits are from 'options' bits stream, how to save bits ? >>> In my understanding, this is some kind of more-bit-field, not each-bit-field. >>> >>> I defined them together, so can quick check the vector type, like >>> (options & BURST_VECTOR_MODE_MASK) == BURST_NEON. >>> >>>>>> >>>>>>> >>>>>>> BURST_SCATTERED = (1 << 8), >>>>>>> BURST_BULK_ALLOC = (1 << 9), >>>>>>> BURST_NORMAL = (1 << 10), >>>>>> >>>>>> Not sure about this one, what is the difference between scalar? >>>>>> >>>>> >>>>> Extract it from the function name and the debug message. >>>>> >>>>> if (pkt_burst == i40e_recv_scattered_pkts) >>>>> options = BURST_SCALAR | BURST_SCATTERED; >>>>> else if (pkt_burst == i40e_recv_pkts_bulk_alloc) >>>>> options = BURST_SCALAR | BURST_BULK_ALLOC; >>>>> else if (pkt_burst == i40e_recv_pkts) >>>>> options = BURST_SCALAR | BURST_NORMAL; >>>> >>>> What is the difference between 'BURST_SCALAR' & "BURST_SCALAR | BURST_NORMAL" ? >>> >>> IMO, "SCALAR" should be "non-Vector" ? Like "BURST_VECTOR" will append with >>> "SSE/AVX2" etc, "SCALAR" will append with other option bits. "Normal" is just >>> handing the Descriptor one by one as *normal*. As I said, I got this name idea >>> from the original log to try cover the right burst behaviors. :) >> >> Why using an additional flag to say there is not additional feature. >> If mbuf bulk alloc supported it is: SCALAR | BULK_ALLOC >> if scattered packets supported it is: SCALAR | SCATTERED >> If no additional feature supported, why not just SCALAR ? >> > > If I understand correctly, removed the unnecessary 'BURST_NORMAL' ? > Yes, that is what I suggest.