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eal: add option to force IOVA as PA mode

PATCH New Chas Williams 1 participant 1 message Nov 30, 2017

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Chas Williams

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PATCH 1/1 eal: add option to force IOVA as PA mode

From: Chas Williams <[email protected]>

The IOMMU in some machines report that they can only support limited widths. IOVA virtual addresses may exceed this width making the use of IOVA virtual addresses difficult. The option CONFIG_RTE_LIBRTE_USE_PHYS_IOVA can used to force IOVA physical address usage.

Signed-off-by Chas Williams <[email protected]>
---
 config/common_base                | 5 +++++
 lib/librte_eal/bsdapp/eal/eal.c   | 4 ++++
 lib/librte_eal/linuxapp/eal/eal.c | 4 ++++
 3 files changed, 13 insertions(+)
config/common_base +5 -0
index e74febe..06b3ded 100644
@@ -820,3 +820,8 @@ CONFIG_RTE_APP_CRYPTO_PERF=y
 # Compile the eventdev application
 #
 CONFIG_RTE_APP_EVENTDEV=y
+
+#
+# Force IOVA physical addresses in VFIO
+#
+CONFIG_RTE_LIBRTE_USE_PHYS_IOVA=n
lib/librte_eal/bsdapp/eal/eal.c +4 -0
index 369a682..b396285 100644
@@ -569,8 +569,12 @@ rte_eal_init(int argc, char **argv)
 		return -1;
 	}
 
+#ifdef RTE_LIBRTE_USE_PHYS_IOVA
+	rte_eal_get_configuration()->iova_mode = RTE_IOVA_PA;
+#else
 	/* autodetect the iova mapping mode (default is iova_pa) */
 	rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
+#endif
 
 	if (internal_config.no_hugetlbfs == 0 &&
 			internal_config.process_type != RTE_PROC_SECONDARY &&
lib/librte_eal/linuxapp/eal/eal.c +4 -0
index 229eec9..13b02fd 100644
@@ -804,8 +804,12 @@ rte_eal_init(int argc, char **argv)
 		return -1;
 	}
 
+#ifdef RTE_LIBRTE_USE_PHYS_IOVA
+	rte_eal_get_configuration()->iova_mode = RTE_IOVA_PA;
+#else
 	/* autodetect the iova mapping mode (default is iova_pa) */
 	rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
+#endif
 
 	/* Workaround for KNI which requires physical address to work */
 	if (rte_eal_get_configuration()->iova_mode == RTE_IOVA_VA &&
Signature · 1 line
2.9.5