From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id E959C1B4BE; Mon, 2 Jul 2018 17:45:36 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jul 2018 08:45:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,299,1526367600"; d="scan'208";a="63487140" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.83]) ([10.237.221.83]) by fmsmga002.fm.intel.com with ESMTP; 02 Jul 2018 08:45:34 -0700 To: Andrew Rybchenko , Jerin Jacob , dev@dpdk.org Cc: thomas@monjalon.net, stable@dpdk.org References: <20180629094443.26540-1-jerin.jacob@caviumnetworks.com> <22d74419-6842-044c-9c61-7855925bf41b@intel.com> <47d3c4aa-04f7-110b-f889-cfb07fecdfca@solarflare.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <47d3c4aa-04f7-110b-f889-cfb07fecdfca@solarflare.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] ethdev: fix queue mapping documentation 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: , X-List-Received-Date: Mon, 02 Jul 2018 15:45:37 -0000 On 7/2/2018 4:32 PM, Andrew Rybchenko wrote: > On 07/02/2018 06:08 PM, Ferruh Yigit wrote: >> On 6/29/2018 10:44 AM, Jerin Jacob wrote: >>> The RTE_MAX_ETHPORT_QUEUE_STATS_MAPS does not exists, change >>> to the correct definition(RTE_ETHDEV_QUEUE_STAT_CNTRS) >>> >>> Fixes: 5de201df8927 ("ethdev: add stats per queue") >>> Cc: stable@dpdk.org >>> >>> Signed-off-by: Jerin Jacob >>> --- >>> lib/librte_ethdev/rte_ethdev.h | 4 ++-- >>> 1 file changed, 2 insertions(+), 2 deletions(-) >>> >>> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h >>> index 36e3984ea..375ea24ce 100644 >>> --- a/lib/librte_ethdev/rte_ethdev.h >>> +++ b/lib/librte_ethdev/rte_ethdev.h >>> @@ -2144,7 +2144,7 @@ void rte_eth_xstats_reset(uint16_t port_id); >>> * @param stat_idx >>> * The per-queue packet statistics functionality number that the transmit >>> * queue is to be assigned. >>> - * The value must be in the range [0, RTE_MAX_ETHPORT_QUEUE_STATS_MAPS - 1]. >>> + * The value must be in the range [0, RTE_ETHDEV_QUEUE_STAT_CNTRS - 1]. >> Yes RTE_MAX_ETHPORT_QUEUE_STATS_MAPS doesn't exits and comment is wrong, but >> RTE_ETHDEV_QUEUE_STAT_CNTRS also slightly not correct. >> >> I think how testpmd uses it increase the confusion. >> >> In ixgbe there is no stats registers per queue, 128 queues are represented by 16 >> register set. stat_idx here is the index of that 16 registers. You map queue to >> stats requester to get queue stats. >> >> Also there is RTE_ETHDEV_QUEUE_STAT_CNTRS config in the ethdev API, which is the >> hardcoded size of the queue stats, its default value is 16. This limits number >> of the queues we can get stats from but saves allocated space. (Why not dynamic?) >> >> You can increase the RTE_ETHDEV_QUEUE_STAT_CNTRS to the max supported number of >> queue and ethdev code will be all valid. But "stat_idx" can't go beyond 16 (for >> ixgbe) because it is hardware limitation and it may change from hw to hw. >> >> Also technically it should be possible to reduce RTE_ETHDEV_QUEUE_STAT_CNTRS to >> a low number, like 2, but in ixgbe map two queues into stat registers 14 & 15 >> and display those two set as queue stat 0 and 1. It seems current implementation >> prevents this and forces the queues mapped should be less than >> RTE_ETHDEV_QUEUE_STAT_CNTRS. Overall it seems there is a mixed used of >> RTE_ETHDEV_QUEUE_STAT_CNTRS and stats queue index values, I assume because both >> are same values. >> >> I suggest updating it as: >> " >> The value must be in the range: >> [0 - MIN(HW Stat Registers Size, RTE_ETHDEV_QUEUE_STAT_CNTRS) - 1] >> " > > Technically I think it is not a problem to specify more than HW supports. > The function should simply return error.  RTE_ETHDEV_QUEUE_STAT_CNTRS is > a hard limit which should be checked by ethdev. > The reasonable next question is how to find out what is the maximum for PMD/HW. > I think it deserves entry in dev_info. May be not now. Yes there is not a way to find out that limit by application, setting RTE_ETHDEV_QUEUE_STAT_CNTRS to 16 and using it as limit solving the issue for now :) > "HW Stats Registers size" is too HW specific. It could be not HW, but the PMD > limitation and limits for Rx and Tx could be different. So, may be something like: > "Device max per Tx queue stats" > >>> * @return >>> * Zero if successful. Non-zero otherwise. >>> */ >>> @@ -2164,7 +2164,7 @@ int rte_eth_dev_set_tx_queue_stats_mapping(uint16_t port_id, >>> * @param stat_idx >>> * The per-queue packet statistics functionality number that the receive >>> * queue is to be assigned. >>> - * The value must be in the range [0, RTE_MAX_ETHPORT_QUEUE_STATS_MAPS - 1]. >>> + * The value must be in the range [0, RTE_ETHDEV_QUEUE_STAT_CNTRS - 1]. >>> * @return >>> * Zero if successful. Non-zero otherwise. >>> */ >>> >