[dpdk-stable] [PATCH 1/3] test: disable no-huge test with PA IOVA

[Stanislaw Kardach <kda@semihalf.com>]

On linux systems without IOMMU support available (be it lack of
supported IOMMU or lack of IOMMU support in kernel), the IOVA mapping
will default to DMA with physical addresses. This implicitly requires
hugepage support (most prominently for performance reasons).
Therefore trying to run the eal_flags_no_huge_autotest in such scenario
is not a valid requirement.

To verify this even on x86 do (output from i5-10210U):

$ ./app/test/dpdk-test -m 18 --iova-mode=pa --no-huge
EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: FATAL: Cannot use IOVA as 'PA' since physical addresses are not available
EAL: Cannot use IOVA as 'PA' since physical addresses are not available

While doing:

$ sudo ./app/test/dpdk-test --iova-mode=pa
EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: No available 1048576 kB hugepages reported
EAL: Probing VFIO support...
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
APP: HPET is not enabled, using TSC as default timer
RTE>>

This commit finishes the above test early with SKIP status to signify
that no-huge support is simply not available.

Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
Cc: stable@dpdk.org
---
 app/test/test_eal_flags.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/app/test/test_eal_flags.c b/app/test/test_eal_flags.c
index 932fbe3d0..462dc6384 100644
--- a/app/test/test_eal_flags.c
+++ b/app/test/test_eal_flags.c
@@ -756,6 +756,15 @@ test_no_huge_flag(void)
 #else
 	const char * prefix = "--file-prefix=nohuge";
 #endif
+#ifdef RTE_EXEC_ENV_LINUX
+	/* EAL requires hugepages for RTE_IOVA_PA operation on linux.
+	 * The test application is run with RTE_IOVA_DC, so if at this point we
+	 * get RTE_IOVA_PA, it means that newly spawned process will also get
+	 * it.
+	 */
+	if (rte_eal_iova_mode() == RTE_IOVA_PA)
+		return TEST_SKIPPED;
+#endif
 
 	/* With --no-huge */
 	const char *argv1[] = {prgname, prefix, no_huge};
-- 
2.27.0