From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 2E831A0352; Thu, 16 Jan 2020 10:00:23 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id C24681BE9E; Thu, 16 Jan 2020 10:00:22 +0100 (CET) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by dpdk.org (Postfix) with ESMTP id 1F61C1BFD6; Thu, 16 Jan 2020 10:00:19 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jan 2020 01:00:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,325,1574150400"; d="scan'208";a="257265175" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.35]) ([10.237.221.35]) by fmsmga002.fm.intel.com with ESMTP; 16 Jan 2020 01:00:16 -0800 To: Thomas Monjalon <thomas@monjalon.net> Cc: =?UTF-8?B?5pa557uf5rWpNTA0NTA=?= <fangtonghao@sangfor.com.cn>, arybchenko@solarflare.com, dev@dpdk.org, stable@dpdk.org, jia.guo@intel.com, cunming.liang@intel.com, qi.z.zhang@intel.com, jungle845943968@outlook.com, Jerin Jacob Kollanukkaran <jerinj@marvell.com> References: <ALoAtwByCGBj4yIcHeJ7v4p-.3.1579070958582.Hmail.fangtonghao@sangfor.com.cn> <32a5b3ff-afe2-75eb-f2cb-b9437a5a8d86@intel.com> <3055448.clyjiGRsXx@xps> From: Ferruh Yigit <ferruh.yigit@intel.com> 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] [PATCH v2] Fixes: ethdev: secondary process change shared memory X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> On 1/15/2020 8:43 PM, Thomas Monjalon wrote: > 15/01/2020 19:35, Ferruh Yigit: >> On 1/15/2020 6:49 AM, 方统浩50450 wrote: >>> Hi Ferruh, thanks for your message. >>> >>> >>> We developed a ethtool-dpdk which is secondary process based dpdk 17.08 version. Our device >>> support hotplug detach, but hotplug deatch is failed when we use ethtool-dpdk.We found the >>> secondary process will change the shared memory when initializing.Secondary process calls >>> "rte_eth_dev_pci_allocate" function and enters "rte_eth_copy_pci_info" function. >>> (rte_eth_dev_pci_generic_probe -> rte_eth_dev_pci_allocate -> rte_eth_copy_pci_info) >>> Then it sets the value of struct "rte_eth_dev_data.dev_flags" to zero.In our platform, this value >>> is equal to 0x0003.(RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC),but after reset >>> the "dev_flags", the value changed to 0x0002.(RTE_ETH_DEV_DETACHABLE).So, our device hotplug >>> detach is failed.I found the similar problem in other dpdk version, include dpdk 19.11.Even though >>> the deivce hotplug detach is discarded,but i think the shared memory changed is unexpected by primary >>> process. >> >> I agree this is the problem. >> In the driver code, 'rte_eth_copy_pci_info' is called only by primary process, >> but the generic code is faulty. >> >> And in 19.11 additionally 'eth_dev_pci_specific_init' also seems has same problem. >> >>> Our driver is ixgbe, i think this problem has a little relationship with driver, Secondary process >>> enters "rte_eth_copy_pci_info" by "rte_eth_dev_pci_allocate".And I agree your opinion, the helper >>> function should simple on what it does.I have two ways to fix this problem, one is add an if-statement >>> >>> in "rte_eth_dev_pci_allocate" function to forbid secondary process enters "rte_eth_copy_pci_info" function, >>> another way is add an if-statement in "rte_eth_copy_pci_info" function to forbid secondary process change >>> shared memory.And First way need to ensure the "rte_eth_copy_pci_info" function won't be called anywhere else. >>> I think the second way is simple and lower risk. >> >> Yes these are the two options. >> >> I agree adding check in the 'rte_eth_copy_pci_info' covers all cases and safer. >> BUT my concern was adding decision making to simple/leaf function and make it >> harder to debug/use, instead of giving what primary/secondary process should >> call decision in higher level. >> >> But I just recognized that some PMDs are calling 'rte_eth_copy_pci_info' on >> secondary process, like mlx4 or szedata2, and most probably this is not their >> intention. >> And 'eth_dev->intr_handle' set in 'rte_eth_copy_pci_info', not calling this >> function may have side affect of 'eth_dev->intr_handle' not set in secondary. >> >> With above considerations I am OK to your proposal to cover all cases, Thomas, >> Andrew, any concern? > > Do you mean drivers need to be fixed? > either it or 'rte_eth_copy_pci_info'. Right now 'rte_eth_copy_pci_info' updates the shared memory, calling it in secondary overwrites the memory set by primary. Options Fang mentioned: 1) Don't call 'rte_eth_copy_pci_info' from secondary process path, this requires fixing 'rte_eth_dev_pci_allocate', 'eth_dev_pci_specific_init' and possibly some drivers. 2) Add a check inside the 'rte_eth_copy_pci_info' to prevent updating shared memory if it is secondary process. Fang's patch does (2), and I am OK with it as well after latest findings.