[dpdk-dev] [PATCH v9 2/9] eal/pci: get iommu class

Santosh Shukla santosh.shukla at caviumnetworks.com
Wed Sep 20 13:23:49 CEST 2017


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 at caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Tested-by: Hemant Agrawal <hemant.agrawal at nxp.com>
---
v8 --> v9:
- Added linuxapp iova stub definition (Suugested by Anatoly)

v6 --> v7:
- squashed v6 series patch [02/12] & [03/12] (Aaron comment).

 lib/librte_eal/bsdapp/eal/eal_pci.c             | 10 ++++++++++
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |  1 +
 lib/librte_eal/common/include/rte_bus.h         | 10 ++++++++++
 lib/librte_eal/common/include/rte_pci.h         | 11 +++++++++++
 lib/librte_eal/linuxapp/eal/eal_pci.c           |  9 +++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 6 files changed, 42 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 04eacdcc7..e2c252320 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -403,6 +403,16 @@ rte_pci_scan(void)
 	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 cfbf8fbd0..c6ffd9399 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -243,5 +243,6 @@ DPDK_17.11 {
 	global:
 
 	rte_pci_match;
+	rte_pci_get_iommu_class;
 
 } DPDK_17.08;
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index c79368d3c..9e40687e5 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -55,6 +55,16 @@ extern "C" {
 /** Double linked list of buses */
 TAILQ_HEAD(rte_bus_list, rte_bus);
 
+
+/**
+ * IOVA mapping mode.
+ */
+enum rte_iova_mode {
+	RTE_IOVA_DC = 0,	/* Don't care mode */
+	RTE_IOVA_PA = (1 << 0),
+	RTE_IOVA_VA = (1 << 1)
+};
+
 /**
  * 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 eab84c7a4..0e36de093 100644
--- 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 8951ce742..26f2be822 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -487,6 +487,15 @@ rte_pci_scan(void)
 	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 287cc75cd..a8c8ea4f4 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -248,5 +248,6 @@ DPDK_17.11 {
 	global:
 
 	rte_pci_match;
+	rte_pci_get_iommu_class;
 
 } DPDK_17.08;
-- 
2.14.1



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