pci: get IOMMU class

Introducing rte_pci_get_iommu_class API which helps to get iommu class
of PCI device on the bus and returns preferred iova mapping mode for
PCI bus.

Patch also adds rte_pci_get_iommu_class definition for:
- bsdapp: api returns default iova mode.
- linuxapp: Has stub implementation, Followup patch has complete
  implementation.

Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Tested-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 04eacdc..1595988 100644 (file)
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -403,6 +403,16 @@ error:
        return -1;
 }
 
+/*
+ * Get iommu class of PCI devices on the bus.
+ */
+enum rte_iova_mode
+rte_pci_get_iommu_class(void)
+{
+       /* Supports only RTE_KDRV_NIC_UIO */
+       return RTE_IOVA_PA;
+}
+
 int
 pci_update_device(const struct rte_pci_addr *addr)
 {

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index cfbf8fb..f8724bd 100644 (file)
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -242,6 +242,7 @@ EXPERIMENTAL {
 DPDK_17.11 {
        global:
 
+       rte_pci_get_iommu_class;
        rte_pci_match;
 
 } DPDK_17.08;

diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 8f8b099..2501fa2 100644 (file)
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -55,6 +55,21 @@ extern "C" {
 /** Double linked list of buses */
 TAILQ_HEAD(rte_bus_list, rte_bus);
 
+
+/**
+ * IOVA mapping mode.
+ *
+ * IOVA mapping mode is iommu programming mode of a device.
+ * That device (for example: IOMMU backed DMA device) based
+ * on rte_iova_mode will generate physical or virtual address.
+ *
+ */
+enum rte_iova_mode {
+       RTE_IOVA_DC = 0,        /* Don't care mode */
+       RTE_IOVA_PA = (1 << 0), /* DMA using physical address */
+       RTE_IOVA_VA = (1 << 1)  /* DMA using virtual address */
+};
+
 /**
  * Bus specific scan for devices attached on the bus.
  * For each bus object, the scan would be responsible for finding devices and

diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index eab84c7..0e36de0 100644 (file)
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -381,6 +381,17 @@ int
 rte_pci_match(const struct rte_pci_driver *pci_drv,
              const struct rte_pci_device *pci_dev);
 
+
+/**
+ * Get iommu class of PCI devices on the bus.
+ * And return their preferred iova mapping mode.
+ *
+ * @return
+ *   - enum rte_iova_mode.
+ */
+enum rte_iova_mode
+rte_pci_get_iommu_class(void);
+
 /**
  * Map the PCI device resources in user space virtual memory address
  *

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 8951ce7..b1d6fbd 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -487,6 +487,15 @@ error:
        return -1;
 }
 
+/*
+ * Get iommu class of PCI devices on the bus.
+ */
+enum rte_iova_mode
+rte_pci_get_iommu_class(void)
+{
+       return RTE_IOVA_PA;
+}
+
 /* Read PCI config space. */
 int rte_pci_read_config(const struct rte_pci_device *device,
                void *buf, size_t len, off_t offset)

diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 287cc75..95756e2 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -247,6 +247,7 @@ EXPERIMENTAL {
 DPDK_17.11 {
        global:
 
+       rte_pci_get_iommu_class;
        rte_pci_match;
 
 } DPDK_17.08;