[dpdk-dev] [PATCH] eal: force IOVA mode to physical

[eric zhang <eric.zhang@windriver.com>]

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>
---
 lib/librte_eal/linuxapp/eal/eal.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index e0b5ae1..bee4aed 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -805,6 +805,7 @@ static void rte_eal_init_alert(const char *msg)
 		return -1;
 	}
 
+#ifndef RTE_EAL_IOVA_MODE_PA
 	/* autodetect the iova mapping mode (default is iova_pa) */
 	rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
 
@@ -816,6 +817,12 @@ static void rte_eal_init_alert(const char *msg)
 			"Some devices want IOVA as VA but PA will be used because.. "
 			"KNI module inserted\n");
 	}
+#else
+	/* Force iova mapping mode to be physical address */
+	rte_eal_get_configuration()->iova_mode = RTE_IOVA_PA;
+	RTE_LOG(WARNING, EAL,
+		"Force the iova mapping mode to be physical address\n");
+#endif
 
 	if (internal_config.no_hugetlbfs == 0 &&
 			internal_config.process_type != RTE_PROC_SECONDARY &&
-- 
1.8.3.1