[dpdk-dev] [PATCH] eal: fix vfio device never works.

[Tetsuya Mukawa <mukawa@igel.co.jp>]

The patch fixes vfio initialization issue introduced by below patch.
 - Commit 35b3313e322b ("pci: merge mapping functions for linux and bsd")

Root cause is that VFIO_PRESENT is inaccessible in eal common level.
To fix it, remove pci_map/unmap_device from common code, then implement
in linux and bsd code.

Reported-by: Michael Qiu <michael.qiu@intel.com>
Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_eal/bsdapp/eal/eal_pci.c    | 39 ++++++++++++++++++++++++
 lib/librte_eal/common/eal_common_pci.c | 55 ----------------------------------
 lib/librte_eal/common/eal_private.h    | 18 +++++++++++
 lib/librte_eal/linuxapp/eal/eal_pci.c  | 50 +++++++++++++++++++++++++++++++
 4 files changed, 107 insertions(+), 55 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 12f39d9..ed31222 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -92,6 +92,45 @@ pci_unbind_kernel_driver(struct rte_pci_device *dev __rte_unused)
 	return -ENOTSUP;
 }
 
+/* Map pci device */
+int
+pci_map_device(struct rte_pci_device *dev)
+{
+	int ret = -1;
+
+	/* try mapping the NIC resources */
+	switch (dev->kdrv) {
+	case RTE_KDRV_NIC_UIO:
+		/* map resources for devices that use uio */
+		ret = pci_uio_map_resource(dev);
+		break;
+	default:
+		RTE_LOG(DEBUG, EAL,
+			"  Not managed by a supported kernel driver, skipped\n");
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
+/* Unmap pci device */
+void
+pci_unmap_device(struct rte_pci_device *dev)
+{
+	/* try unmapping the NIC resources */
+	switch (dev->kdrv) {
+	case RTE_KDRV_NIC_UIO:
+		/* unmap resources for devices that use uio */
+		pci_uio_unmap_resource(dev);
+		break;
+	default:
+		RTE_LOG(DEBUG, EAL,
+			"  Not managed by a supported kernel driver, skipped\n");
+		break;
+	}
+}
+
 void
 pci_uio_free_resource(struct rte_pci_device *dev,
 		struct mapped_pci_resource *uio_res)
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 3805aed..60e40e0 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -137,61 +137,6 @@ pci_unmap_resource(void *requested_addr, size_t size)
 				requested_addr);
 }
 
-/* Map pci device */
-static int
-pci_map_device(struct rte_pci_device *dev)
-{
-	int ret = -1;
-
-	/* try mapping the NIC resources using VFIO if it exists */
-	switch (dev->kdrv) {
-	case RTE_KDRV_VFIO:
-#ifdef VFIO_PRESENT
-		if (pci_vfio_is_enabled())
-			ret = pci_vfio_map_resource(dev);
-#endif
-		break;
-	case RTE_KDRV_IGB_UIO:
-	case RTE_KDRV_UIO_GENERIC:
-	case RTE_KDRV_NIC_UIO:
-		/* map resources for devices that use uio */
-		ret = pci_uio_map_resource(dev);
-		break;
-	default:
-		RTE_LOG(DEBUG, EAL, "  Not managed by a supported kernel driver,"
-			" skipped\n");
-		ret = 1;
-		break;
-	}
-
-	return ret;
-}
-
-/* Unmap pci device */
-static void
-pci_unmap_device(struct rte_pci_device *dev)
-{
-	if (dev == NULL)
-		return;
-
-	/* try unmapping the NIC resources using VFIO if it exists */
-	switch (dev->kdrv) {
-	case RTE_KDRV_VFIO:
-		RTE_LOG(ERR, EAL, "Hotplug doesn't support vfio yet\n");
-		break;
-	case RTE_KDRV_IGB_UIO:
-	case RTE_KDRV_UIO_GENERIC:
-	case RTE_KDRV_NIC_UIO:
-		/* unmap resources for devices that use uio */
-		pci_uio_unmap_resource(dev);
-		break;
-	default:
-		RTE_LOG(DEBUG, EAL, "  Not managed by a supported kernel driver,"
-			" skipped\n");
-		break;
-	}
-}
-
 /*
  * If vendor/device ID match, call the devinit() function of the
  * driver.
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index e16bb68..73363f6 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -165,6 +165,24 @@ struct rte_pci_device;
 int pci_unbind_kernel_driver(struct rte_pci_device *dev);
 
 /**
+ * Map this device
+ *
+ * This function is private to EAL.
+ *
+ * @return
+ *   0 on success, negative on error and positive if no driver
+ *   is found for the device.
+ */
+int pci_map_device(struct rte_pci_device *dev);
+
+/**
+ * Unmap this device
+ *
+ * This function is private to EAL.
+ */
+void pci_unmap_device(struct rte_pci_device *dev);
+
+/**
  * Map the PCI resource of a PCI device in virtual memory
  *
  * This function is private to EAL.
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 1d5a13b..9a28ede 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -123,6 +123,56 @@ pci_get_kernel_driver_by_path(const char *filename, char *dri_name)
 	return -1;
 }
 
+/* Map pci device */
+int
+pci_map_device(struct rte_pci_device *dev)
+{
+	int ret = -1;
+
+	/* try mapping the NIC resources using VFIO if it exists */
+	switch (dev->kdrv) {
+	case RTE_KDRV_VFIO:
+#ifdef VFIO_PRESENT
+		if (pci_vfio_is_enabled())
+			ret = pci_vfio_map_resource(dev);
+#endif
+		break;
+	case RTE_KDRV_IGB_UIO:
+	case RTE_KDRV_UIO_GENERIC:
+		/* map resources for devices that use uio */
+		ret = pci_uio_map_resource(dev);
+		break;
+	default:
+		RTE_LOG(DEBUG, EAL,
+			"  Not managed by a supported kernel driver, skipped\n");
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
+/* Unmap pci device */
+void
+pci_unmap_device(struct rte_pci_device *dev)
+{
+	/* try unmapping the NIC resources using VFIO if it exists */
+	switch (dev->kdrv) {
+	case RTE_KDRV_VFIO:
+		RTE_LOG(ERR, EAL, "Hotplug doesn't support vfio yet\n");
+		break;
+	case RTE_KDRV_IGB_UIO:
+	case RTE_KDRV_UIO_GENERIC:
+		/* unmap resources for devices that use uio */
+		pci_uio_unmap_resource(dev);
+		break;
+	default:
+		RTE_LOG(DEBUG, EAL,
+			"  Not managed by a supported kernel driver, skipped\n");
+		break;
+	}
+}
+
 void *
 pci_find_max_end_va(void)
 {
-- 
2.1.4