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Tue, 11 Jul 2017 10:02:31 +0000 From: Jerin Jacob To: dev@dpdk.org Cc: thomas@monjalon.net, olivier.matz@6wind.com, stephen@networkplumber.org, santosh.shukla@caviumnetworks.com, hemant.agrawal@nxp.com, bruce.richardson@intel.com, shreyansh.jain@nxp.com, gaetan.rivet@6wind.com, sergio.gonzalez.monroy@intel.com, anatoly.burakov@intel.com, Jerin Jacob Date: Tue, 11 Jul 2017 15:31:41 +0530 Message-Id: <20170711100141.3950-1-jerin.jacob@caviumnetworks.com> X-Mailer: git-send-email 2.13.2 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [106.201.60.201] X-ClientProxiedBy: SG2PR04CA0149.apcprd04.prod.outlook.com (10.170.139.33) To BLUPR0701MB1713.namprd07.prod.outlook.com (10.163.85.14) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5d0871b2-7563-4fdd-304c-08d4c843f4dd X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(300000503095)(300135400095)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); 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Instead, the device does go through an IO address translation memory management unit. On x86, we call it as IOMMU and on ARM as SMMU. More details: http://osidays.com/osidays/wp-content/uploads/2014/12/Final_OSI2014_IOMMU_DetailedView_Sanil_Anurup.pdf Based on discussion in the following thread http://dpdk.org/ml/archives/dev/2017-July/070850.html We would like to change reference to physical address to more appropriate name as with IOMMU/SMMU with the device won't be dealing directly with the physical address. An ABI change is planned for 17.11 to change following data structure or functions to more appropriate name. Currently planned to change it iova as instead of phys Please note: The change will be only for the name and functional aspects of the API will remain same. Following functions/data structures name may change. This list is based on v17.05-rc1. It may change based on v17.11 code base. typedef: phys_addr_t structures: struct rte_memseg::phys_addr struct rte_mbuf::buf_physaddr functions: rte_mempool_populate_phys() rte_mempool_populate_phys_tab() rte_eal_using_phys_addrs() rte_mem_virt2phy() rte_dump_physmem_layout() rte_eal_get_physmem_layout() rte_eal_get_physmem_size() rte_malloc_virt2phy() rte_mem_phy2mch() Signed-off-by: Jerin Jacob --- doc/guides/rel_notes/deprecation.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst index 257dcba32..379920fbb 100644 --- a/doc/guides/rel_notes/deprecation.rst +++ b/doc/guides/rel_notes/deprecation.rst @@ -64,3 +64,10 @@ Deprecation Notices be removed in 17.11: - ``rte_eal_parse_devargs_str``, replaced by ``rte_eal_devargs_parse`` + +* eal: An ABI change is planned for 17.11 to make dpdk aware of IOVA address + translation scheme. + Reference to phys address in eal data-structure or functions may change to + IOVA address or more appropriate name. + The change will be only for the name. + Functional aspects of the API or data-structure will remain same. -- 2.13.2