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Thu, 30 Aug 2018 12:59:25 +0000 To: hemant.agrawal@nxp.com, =?UTF-8?Q?Ga=c3=abtan_Rivet?= , "Burakov, Anatoly" Cc: eric zhang , bruce.richardson@intel.com, dev@dpdk.org, Allain.Legacy@windriver.com, Matt.Peters@windriver.com References: <1535558289-10336-1-git-send-email-eric.zhang@windriver.com> <20180830094323.37xkgud4fz3mflbg@bidouze.vm.6wind.com> <0f19de06-fccd-eff2-b33e-71d49a005dbb@nxp.com> From: santosh Message-ID: Date: Thu, 30 Aug 2018 18:29:10 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <0f19de06-fccd-eff2-b33e-71d49a005dbb@nxp.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [45.117.223.90] X-ClientProxiedBy: PN1PR0101CA0066.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c00:d::28) To BYAPR07MB4328.namprd07.prod.outlook.com (2603:10b6:a02:bf::22) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0119e96b-f51e-48a2-8bd1-08d60e786b8a X-Microsoft-Antispam: BCL:0; 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There exists virtual devices that are not >>>> directly attached to the PCI bus, and therefore the auto detection >>>> of the IOVA mode based on probing the PCI bus and IOMMU configuration >>>> may not report the required addressing mode. Having the configuration >>>> option permits the mode to be explicitly configured in this scenario. >>>> >>>> Signed-off-by: eric zhang >>>> --- >>> Defining this at compile-time seems like an overkill. Wouldn't it be better >>> to just add an EAL command-line option to force IOVA mode to a particular >>> value? > That is a good suggestion. >>> -- >>> Thanks, >>> Anatoly >> What is the bus of these devices and why not implement get_iommu_class >> in it? > There are cases, where you are using dpdk libraries with external > libraries and you need to change the default behavior DPDK lib to use > physical address instead of virtual address. > Providing an option to user will help. > > More appropriate solution could be: * Either fix it at bus layer .. i.e.. get_iommu_class().. * Or introduce something like [1] --iova-mode= param. Former is better solution than latter if autodetection is a key criteria. Thanks. [1] http://patchwork.dpdk.org/patch/25192/