[dpdk-dev] [RFC PATCH] igb_uio: issue FLR during open and release of device file

[Shijith Thotton]

Set UIO info device file operations open and release. Call pci reset
function inside open and release to clear device state at start and
end. Copied this behaviour from vfio_pci kernel module code. With this
change, it is not mandatory to issue FLR by PMD's during init and close.

Signed-off-by: Shijith Thotton <shijith.thot...@caviumnetworks.com>
---
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c 
b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index b9d427c..5bc58d2 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -170,6 +170,34 @@ struct rte_uio_pci_dev {
        return IRQ_HANDLED;
 }
 
+/**
+ * This gets called while opening uio device file. It clears any previous state
+ * associated with the pci device.
+ */
+static int
+igbuio_pci_open(struct uio_info *info, struct inode *inode)
+{
+       struct rte_uio_pci_dev *udev = info->priv;
+       struct pci_dev *dev = udev->pdev;
+
+       /* reset the pci device */
+       pci_reset_function(dev);
+
+       return 0;
+}
+
+static int
+igbuio_pci_release(struct uio_info *info, struct inode *inode)
+{
+       struct rte_uio_pci_dev *udev = info->priv;
+       struct pci_dev *dev = udev->pdev;
+
+       /* try to reset the pci device */
+       pci_try_reset_function(dev);
+
+       return 0;
+}
+
 #ifdef CONFIG_XEN_DOM0
 static int
 igbuio_dom0_mmap_phys(struct uio_info *info, struct vm_area_struct *vma)
@@ -372,6 +400,8 @@ struct rte_uio_pci_dev {
        udev->info.version = "0.1";
        udev->info.handler = igbuio_pci_irqhandler;
        udev->info.irqcontrol = igbuio_pci_irqcontrol;
+       udev->info.open = igbuio_pci_open;
+       udev->info.release = igbuio_pci_release;
 #ifdef CONFIG_XEN_DOM0
        /* check if the driver run on Xen Dom0 */
        if (xen_initial_domain())
-- 
1.8.3.1