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eal: force IOVA to a particular mode

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This patch uses EAL option "--iova-mode" to force the IOVA mode to a
particular value. 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. Using the EAL option permits the
mode to be explicitly configured in this scenario.

Signed-off-by: Eric Zhang <eric.zhang@windriver.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: Marko Kovacevic <marko.kovacevic@intel.com>
This commit is contained in:
Eric Zhang 2018-10-03 16:53:13 -04:00 committed by Thomas Monjalon
parent 783667c9f9
commit 075b182b54
4 changed files with 37 additions and 11 deletions
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8
doc/guides/prog_guide/env_abstraction_layer.rst
View File

@ -358,6 +358,14 @@ Misc Functions
Locks and atomic operations are per-architecture (i686 and x86_64).
IOVA Mode Configuration
~~~~~~~~~~~~~~~~~~~~~~~
Auto detection of the IOVA mode, based on probing the bus and IOMMU configuration, may not report
the desired addressing mode when virtual devices that are not directly attached to the bus are present.
To facilitate forcing the IOVA mode to a specific value the EAL command line option ``--iova-mode`` can
be used to select either physical addressing('pa') or virtual addressing('va').
Memory Segments and Memory Zones (memzone)
------------------------------------------

4
doc/guides/testpmd_app_ug/run_app.rst
View File

@ -133,6 +133,10 @@ See the DPDK Getting Started Guides for more information on these options.
Use malloc instead of hugetlbfs.
* ``--iova-mode <pa|va>``
Force IOVA mode to a specific value.
Testpmd Command-line Options
----------------------------

11
lib/librte_eal/bsdapp/eal/eal.c
View File

@ -656,8 +656,15 @@ rte_eal_init(int argc, char **argv)
return -1;
}
/* autodetect the iova mapping mode (default is iova_pa) */
rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
/* if no EAL option "--iova-mode=<pa|va>", use bus IOVA scheme */
if (internal_config.iova_mode == RTE_IOVA_DC) {
/* autodetect the IOVA mapping mode (default is RTE_IOVA_PA) */
rte_eal_get_configuration()->iova_mode =
rte_bus_get_iommu_class();
} else {
rte_eal_get_configuration()->iova_mode =
internal_config.iova_mode;
}
if (internal_config.no_hugetlbfs == 0) {
/* rte_config isn't initialized yet */

25
lib/librte_eal/linuxapp/eal/eal.c
View File

@ -912,16 +912,23 @@ rte_eal_init(int argc, char **argv)
return -1;
}
/* autodetect the iova mapping mode (default is iova_pa) */
rte_eal_get_configuration()->iova_mode = rte_bus_get_iommu_class();
/* if no EAL option "--iova-mode=<pa|va>", use bus IOVA scheme */
if (internal_config.iova_mode == RTE_IOVA_DC) {
/* autodetect the IOVA mapping mode (default is RTE_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");
/* 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");
}
} else {
rte_eal_get_configuration()->iova_mode =
internal_config.iova_mode;
}
if (internal_config.no_hugetlbfs == 0) {