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Mon, 10 Jul 2017 11:43:40 +0000 From: Santosh Shukla To: thomas@monjalon.net, dev@dpdk.org Cc: bruce.richardson@intel.com, jerin.jacob@caviumnetworks.com, hemant.agrawal@nxp.com, shreyansh.jain@nxp.com, gaetan.rivet@6wind.com, sergio.gonzalez.monroy@intel.com, anatoly.burakov@intel.com, stephen@networkplumber.org, maxime.coquelin@redhat.com, olivier.matz@6wind.com, Santosh Shukla Date: Mon, 10 Jul 2017 11:42:24 +0000 Message-Id: <20170710114235.18970-2-santosh.shukla@caviumnetworks.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170710114235.18970-1-santosh.shukla@caviumnetworks.com> References: <20170608110513.22548-1-santosh.shukla@caviumnetworks.com> <20170710114235.18970-1-santosh.shukla@caviumnetworks.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [111.93.218.67] X-ClientProxiedBy: PN1PR01CA0082.INDPRD01.PROD.OUTLOOK.COM (10.174.144.150) To MWHPR07MB3101.namprd07.prod.outlook.com (10.172.95.7) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6f305549-0e7d-4a82-6ab7-08d4c788eaff X-Microsoft-Antispam: UriScan:; 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Flag used when driver needs to operate in iova=va mode. Why driver need iova=va mapping? On NPU style co-processors like Octeontx, the buffer recycling has been done in HW, unlike SW model. Here is the data flow: 1) On control path, Fill the HW mempool with buffers(iova as pa address) 2) on rx_burst, HW gives you IOVA address(iova as pa address) 3) As application expects VA to operate on it, rx_burst() needs to convert to _va from _pa. Which is very expensive. Instead of that if iova as va mapping, we can avoid the cost of converting with help of IOMMU/SMMU. Signed-off-by: Santosh Shukla Signed-off-by: Jerin Jacob --- lib/librte_eal/common/include/rte_pci.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h index 8b123391c..ac79040dd 100644 --- a/lib/librte_eal/common/include/rte_pci.h +++ b/lib/librte_eal/common/include/rte_pci.h @@ -202,6 +202,8 @@ struct rte_pci_bus { #define RTE_PCI_DRV_INTR_RMV 0x0010 /** Device driver needs to keep mapped resources if unsupported dev detected */ #define RTE_PCI_DRV_KEEP_MAPPED_RES 0x0020 +/** Device driver needs iova as va */ +#define RTE_PCI_DRV_NEED_IOVA_VA 0X0040 /** * A structure describing a PCI mapping. -- 2.13.0