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From: Santosh Shukla <santosh.shukla@caviumnetworks.com>
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Santosh Shukla <santosh.shukla@caviumnetworks.com>
Date: Mon, 24 Jul 2017 14:09:53 +0530
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Subject: [dpdk-dev] [PATCH v5 01/12] eal/pci: introduce PCI driver iova as
va flag
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Introducing RTE_PCI_DRV_IOVA_AS_VA flag. 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 <santosh.shukla@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
v3 --> v4:
- Renamed RTE_PCI_DRV_NEED_IOVA_VA to RTE_PCI_DRV_IOVA_AS_VA.
(Suggested by Maxime)
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..743392f91 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 supports iova as va */
+#define RTE_PCI_DRV_IOVA_AS_VA 0X0040
/**
* A structure describing a PCI mapping.
--
2.11.0