[dpdk-dev] i40e igb_uio: reset pci on process exit

[Gregory Etelson]

Hello,

My tests show 
if DPDK process attached to i40e VF through igb_uio 
exists without calling rte_eth_dev_close() 
then new instance attached to that VF could experience IO failures.
I came up with the following patch to ensure igb_uio will always reset PCI on 
process exit.
However, I would like to hear experts opinion to be sure __pci_reset_function
resets i40e VF properly.

Thank you.
Regards,
Gregory 


diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c 
b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index b9d427c..7d7ff9d 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -170,6 +170,19 @@ struct rte_uio_pci_dev {
        return IRQ_HANDLED;
 }
 
+static int
+igbuio_pci_release(struct uio_info *info, struct inode *inode)
+{
+       int ret;
+       struct rte_uio_pci_dev *udev = info->priv;
+       struct pci_dev *dev = udev->pdev;
+       ret = __pci_reset_function(dev);
+       dev_info(&dev->dev, "pci_reset_function %s \n",
+                 ret == 0 ? "succeded" : "failed");
+       return 0;
+}
+
+
 #ifdef CONFIG_XEN_DOM0
 static int
 igbuio_dom0_mmap_phys(struct uio_info *info, struct vm_area_struct *vma)
@@ -372,6 +385,7 @@ struct rte_uio_pci_dev {
        udev->info.version = "0.1";
        udev->info.handler = igbuio_pci_irqhandler;
        udev->info.irqcontrol = igbuio_pci_irqcontrol;
+       udev->info.release = igbuio_pci_release;
 #ifdef CONFIG_XEN_DOM0
        /* check if the driver run on Xen Dom0 */
        if (xen_initial_domain())