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Thu, 6 Sep 2018 07:34:57 +0000 Date: Thu, 6 Sep 2018 13:04:49 +0530 From: Jerin Jacob <jerin.jacob@caviumnetworks.com> To: Eric Zhang <eric.zhang@windriver.com> Cc: santosh <santosh.shukla@caviumnetworks.com>, hemant.agrawal@nxp.com, =?iso-8859-1?Q?Ga=EBtan?= Rivet <gaetan.rivet@6wind.com>, "Burakov, Anatoly" <anatoly.burakov@intel.com>, bruce.richardson@intel.com, dev@dpdk.org, Allain.Legacy@windriver.com, Matt.Peters@windriver.com Message-ID: <20180906073449.GA20576@jerin> References: <1535558289-10336-1-git-send-email-eric.zhang@windriver.com> <e96cdef8-3247-9f75-9ed0-6b3234d861ce@intel.com> <20180830094323.37xkgud4fz3mflbg@bidouze.vm.6wind.com> <0f19de06-fccd-eff2-b33e-71d49a005dbb@nxp.com> <a8b41461-9888-b88f-7b3b-1c5a4b225e37@caviumnetworks.com> <9ae6e3dd-5f33-d874-9a58-730435b58de3@windriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9ae6e3dd-5f33-d874-9a58-730435b58de3@windriver.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Originating-IP: [31.216.236.195] X-ClientProxiedBy: DB6PR07CA0023.eurprd07.prod.outlook.com (2603:10a6:6:2d::33) To SN6PR07MB5005.namprd07.prod.outlook.com (2603:10b6:805:ac::31) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: a40a4ea6-d00c-4b3e-1b27-08d613cb4054 X-Microsoft-Antispam: BCL:0; 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Linux x86_64; rv:52.0) Gecko/20100101 > Thunderbird/52.9.1 > > On 08/30/2018 08:59 AM, santosh wrote: > > On Thursday 30 August 2018 05:43 PM, Hemant wrote: > > > External Email > > > > > > Hi, > > > > > > On 8/30/2018 3:13 PM, Gaëtan Rivet wrote: > > > > Hi, > > > > > > > > On Thu, Aug 30, 2018 at 10:09:04AM +0100, Burakov, Anatoly wrote: > > > > > On 29-Aug-18 4:58 PM, eric zhang wrote: > > > > > > This patch adds a configuration option to force the IOVA mode to > > > > > > physical address (PA). 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 <eric.zhang@windriver.com> > > > > > > --- > > > > > 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=<pa/va> param. > > > > Former is better solution than latter if autodetection is a key criteria. > > Thanks. > > > > [1] http://patchwork.dpdk.org/patch/25192/ > > > It's not generic which couldn't be fixed at bus layer. > So what's the preference of EAL option or compile time solution? > Adding --iova-mode as patch [1] will overrivde auto-detection > rte_bus_get_iommu_class() > make it no use; compile time solution will align with upstream and keep > new atuodetection > solution in #ifndef. If it is for vdev devices, why not introduce something like RTE_PCI_DRV_IOVA_AS_VA and let vdev device describe its personality. And based on the devices(flags) on vdev bus, rte_bus_get_iommu_class() of vdev can decide the mode just like PCI bus. > > Thanks > Eric >