eal/linux: force IOVA as PA mode if KNI module inserted

Fix kernel crash with KNI because KNI requires physical addresses.

When IOVA VA mode used, memzones and mbufs physical address fields
contain virtual addresses. But KNI relies on these fields to enable
kernel access for buffers. Those fields having virtual address cause
crash in kernel.

This is a workaround until KNI fixed properly to work with virtual
addresses.

Fixes: 72d013644bd6 ("mem: honor IOVA mode in malloc virt2phy")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index a5a71c6..229eec9 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -807,6 +807,15 @@ rte_eal_init(int argc, char **argv)
        /* autodetect the iova mapping mode (default is iova_pa) */
        rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
 
+       /* Workaround for KNI which requires physical address to work */
+       if (rte_eal_get_configuration()->iova_mode == RTE_IOVA_VA &&
+                       rte_eal_check_module("rte_kni") == 1) {
+               rte_eal_get_configuration()->iova_mode = RTE_IOVA_PA;
+               RTE_LOG(WARNING, EAL,
+                       "Some devices want IOVA as VA but PA will be used because.. "
+                       "KNI module inserted\n");
+       }
+
        if (internal_config.no_hugetlbfs == 0 &&
                        internal_config.process_type != RTE_PROC_SECONDARY &&
                        eal_hugepage_info_init() < 0) {