[dpdk-dev] [PATCH V2] igb_uio: fix uevent montior issue

[Jeff Guo <jia.guo@intel.com>]

udev could not detect remove and add event of device when hotplug in
and out devices, that related with the fix about using pointer of
rte_uio_pci_dev as dev_id instead of uio_device for irq device handler,
that would result igb uio irq failure when kernel version after than 3.17.

The root cause is that the older version of Linux kernel don't expose the
uio_device structure, only for the kernel version after than 3.17 use
uio_device. so this patch correct it by use a macro to check before handle
the pci interrupt.

Fixes: 6b9ed026a870 ("igb_uio: fix build with kernel <= 3.17")
Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
v2->v1:
use macro in compat.h to replace of version check in .c file, benifit for
future backport and make more readable. 
---
 lib/librte_eal/linuxapp/igb_uio/compat.h  |  4 ++++
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lib/librte_eal/linuxapp/igb_uio/compat.h b/lib/librte_eal/linuxapp/igb_uio/compat.h
index ce456d4..2c61190 100644
--- a/lib/librte_eal/linuxapp/igb_uio/compat.h
+++ b/lib/librte_eal/linuxapp/igb_uio/compat.h
@@ -132,3 +132,7 @@ static bool pci_check_and_mask_intx(struct pci_dev *pdev)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
 #define HAVE_PCI_MSI_MASK_IRQ 1
 #endif
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 17, 0)
+#define HAVE_UIO_DEVICE_STRUCTURE 1
+#endif
diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index 4cae4dd..99018f4 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -192,8 +192,14 @@ igbuio_pci_irqcontrol(struct uio_info *info, s32 irq_state)
 static irqreturn_t
 igbuio_pci_irqhandler(int irq, void *dev_id)
 {
+#ifndef HAVE_UIO_DEVICE_STRUCTURE
 	struct rte_uio_pci_dev *udev = (struct rte_uio_pci_dev *)dev_id;
 	struct uio_info *info = &udev->info;
+#else
+	struct uio_device *idev = (struct uio_device *)dev_id;
+	struct uio_info *info = idev->info;
+	struct rte_uio_pci_dev *udev = info->priv;
+#endif
 
 	/* Legacy mode need to mask in hardware */
 	if (udev->mode == RTE_INTR_MODE_LEGACY &&
@@ -279,9 +285,15 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
 	}
 
 	if (udev->info.irq != UIO_IRQ_NONE)
+#ifndef HAVE_UIO_DEVICE_STRUCTURE
 		err = request_irq(udev->info.irq, igbuio_pci_irqhandler,
 				  udev->info.irq_flags, udev->info.name,
 				  udev);
+#else
+		err = request_irq(udev->info.irq, igbuio_pci_irqhandler,
+				  udev->info.irq_flags, udev->info.name,
+				  udev->info.uio_dev);
+#endif
 	dev_info(&udev->pdev->dev, "uio device registered with irq %ld\n",
 		 udev->info.irq);
 
@@ -292,7 +304,11 @@ static void
 igbuio_pci_disable_interrupts(struct rte_uio_pci_dev *udev)
 {
 	if (udev->info.irq) {
+#ifndef HAVE_UIO_DEVICE_STRUCTURE
 		free_irq(udev->info.irq, udev);
+#else
+		free_irq(udev->info.irq, udev->info.uio_dev);
+#endif
 		udev->info.irq = 0;
 	}
 
-- 
2.7.4