API(rte_bus_get_iommu_class) helps to automatically detect and select appropriate iova mapping scheme for iommu capable device on that bus.
Algorithm for iova scheme selection for bus: 0. Iterate through bus_list. 1. Collect each bus iova mode value and update into 'mode' var. 2. Mode selection scheme is: if mode == 0 then iova mode is _pa, if mode == 1 then iova mode is _pa, if mode == 2 then iova mode is _va, if mode == 3 then iova mode ia _pa. So mode !=2 will be default iova mode (_pa). Signed-off-by: Santosh Shukla <santosh.shu...@caviumnetworks.com> Signed-off-by: Jerin Jacob <jerin.ja...@caviumnetworks.com> --- v3 --> v4: - Initialized mode to RTE_IOVA_DC in rte_bus_get_iommu_class. lib/librte_eal/bsdapp/eal/rte_eal_version.map | 1 + lib/librte_eal/common/eal_common_bus.c | 23 +++++++++++++++++++++++ lib/librte_eal/common/eal_common_pci.c | 1 + lib/librte_eal/common/include/rte_bus.h | 22 ++++++++++++++++++++++ lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 + 5 files changed, 48 insertions(+) diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map index 4b25318be..b9ee82b6b 100644 --- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map +++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map @@ -202,6 +202,7 @@ DPDK_17.08 { rte_bus_find_by_name; rte_pci_match; rte_pci_get_iommu_class; + rte_bus_get_iommu_class; } DPDK_17.05; diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c index 08bec2d93..a30a8982e 100644 --- a/lib/librte_eal/common/eal_common_bus.c +++ b/lib/librte_eal/common/eal_common_bus.c @@ -222,3 +222,26 @@ rte_bus_find_by_device_name(const char *str) c[0] = '\0'; return rte_bus_find(NULL, bus_can_parse, name); } + + +/* + * Get iommu class of devices on the bus. + */ +enum rte_iova_mode +rte_bus_get_iommu_class(void) +{ + int mode = RTE_IOVA_DC; + struct rte_bus *bus; + + TAILQ_FOREACH(bus, &rte_bus_list, next) { + + if (bus->get_iommu_class) + mode |= bus->get_iommu_class(); + } + + if (mode != RTE_IOVA_VA) { + /* Use default IOVA mode */ + mode = RTE_IOVA_PA; + } + return mode; +} diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c index 8b6ecebd6..bdf2e7c3a 100644 --- a/lib/librte_eal/common/eal_common_pci.c +++ b/lib/librte_eal/common/eal_common_pci.c @@ -552,6 +552,7 @@ struct rte_pci_bus rte_pci_bus = { .plug = pci_plug, .unplug = pci_unplug, .parse = pci_parse, + .get_iommu_class = rte_pci_get_iommu_class, }, .device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list), .driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list), diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h index e06084253..94f1fdfca 100644 --- a/lib/librte_eal/common/include/rte_bus.h +++ b/lib/librte_eal/common/include/rte_bus.h @@ -182,6 +182,17 @@ struct rte_bus_conf { enum rte_bus_scan_mode scan_mode; /**< Scan policy. */ }; + +/** + * Get iommu class of devices on the bus. + * Check that those devices are attached to iommu driver. + * + * @return + * enum rte_iova_mode value. + */ +typedef enum rte_iova_mode (*rte_bus_get_iommu_class_t)(void); + + /** * A structure describing a generic bus. */ @@ -195,6 +206,7 @@ struct rte_bus { rte_bus_unplug_t unplug; /**< Remove single device from driver */ rte_bus_parse_t parse; /**< Parse a device name */ struct rte_bus_conf conf; /**< Bus configuration */ + rte_bus_get_iommu_class_t get_iommu_class; /**< Get iommu class */ }; /** @@ -294,6 +306,16 @@ struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev); */ struct rte_bus *rte_bus_find_by_name(const char *busname); + +/** + * Get iommu class of devices on the bus. + * Check that those devices are attached to iommu driver. + * + * @return + * enum rte_iova_mode value. + */ +enum rte_iova_mode rte_bus_get_iommu_class(void); + /** * Helper for Bus registration. * The constructor has higher priority than PMD constructors. diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map index 5dd40f948..705af3adc 100644 --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map @@ -207,6 +207,7 @@ DPDK_17.08 { rte_bus_find_by_name; rte_pci_match; rte_pci_get_iommu_class; + rte_bus_get_iommu_class; } DPDK_17.05; -- 2.11.0