[v2,1/3] eal/linux: select iova-mode va with no-huge option
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Commit Message
If --no-huge is set and iova-mode has not been specified force VA mode.
If --no-huge and --iova-mode=PA is requested error out as this is
an impossible configuration.
Signed-off-by: David Wilder <dwilder@us.ibm.com>
---
lib/librte_eal/linux/eal/eal.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
@@ -1062,9 +1062,16 @@ rte_eal_init(int argc, char **argv)
/* 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 */
enum rte_iova_mode iova_mode = rte_bus_get_iommu_class();
+ if (iova_mode == RTE_IOVA_PA && !rte_eal_has_hugepages()) {
+ iova_mode = RTE_IOVA_VA;
+ RTE_LOG(WARNING, EAL, "Some buses want 'PA' but forcing 'VA' because --no-huge is requested.\n");
+ RTE_LOG(WARNING, EAL, "Not all buses may be able to initialize.\n");
+ }
+
if (iova_mode == RTE_IOVA_DC) {
RTE_LOG(DEBUG, EAL, "Buses did not request a specific IOVA mode.\n");
@@ -1111,6 +1118,13 @@ rte_eal_init(int argc, char **argv)
internal_config.iova_mode;
}
+ if (rte_eal_iova_mode() == RTE_IOVA_PA &&
+ rte_eal_has_hugepages() == 0) {
+ rte_eal_init_alert("Cannot use IOVA as 'PA' with --no-huge");
+ rte_errno = EINVAL;
+ return -1;
+ }
+
if (rte_eal_iova_mode() == RTE_IOVA_PA && !phys_addrs) {
rte_eal_init_alert("Cannot use IOVA as 'PA' since physical addresses are not available");
rte_errno = EINVAL;