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igb_uio: handle no IRQ fallback

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Fix a couple of issues with my earlier igb_uio stuff:
1. With MSI (like MSI-X) actual IRQ number is not known until
   after the pci_enable_msi() is done.
2. If INTX fails, fall back to running without IRQ.
   This allows usermode PCI to recover and run without out IRQ
   for cases where PCI INTX support is broken (aka VMWare).

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
This commit is contained in:
Stephen Hemminger 2014-07-25 10:37:54 -07:00 committed by Thomas Monjalon
parent 4a5c221f9d
commit 4094930e55
1 changed files with 9 additions and 8 deletions
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17
lib/librte_eal/linuxapp/igb_uio/igb_uio.c
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@ -506,7 +506,6 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
udev->info.version = "0.1";
udev->info.handler = igbuio_pci_irqhandler;
udev->info.irqcontrol = igbuio_pci_irqcontrol;
udev->info.irq = dev->irq;
#ifdef CONFIG_XEN_DOM0
/* check if the driver run on Xen Dom0 */
if (xen_initial_domain())
@ -516,9 +515,6 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
udev->pdev = dev;
switch (igbuio_intr_mode_preferred) {
case RTE_INTR_MODE_NONE:
udev->info.irq = 0;
break;
case RTE_INTR_MODE_MSIX:
/* Only 1 msi-x vector needed */
msix_entry.entry = 0;
@ -532,6 +528,7 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
case RTE_INTR_MODE_MSI:
if (pci_enable_msi(dev) == 0) {
dev_dbg(&dev->dev, "using MSI");
udev->info.irq = dev->irq;
udev->mode = RTE_INTR_MODE_MSI;
break;
}
@ -540,13 +537,17 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
if (pci_intx_mask_supported(dev)) {
dev_dbg(&dev->dev, "using INTX");
udev->info.irq_flags = IRQF_SHARED;
udev->info.irq = dev->irq;
udev->mode = RTE_INTR_MODE_LEGACY;
} else {
dev_err(&dev->dev, "PCI INTX mask not supported\n");
err = -EIO;
goto fail_release_iomem;
break;
}
dev_notice(&dev->dev, "PCI INTX mask not supported\n");
/* fall back to no IRQ */
case RTE_INTR_MODE_NONE:
udev->mode = RTE_INTR_MODE_NONE;
udev->info.irq = 0;
break;
default:
dev_err(&dev->dev, "invalid IRQ mode %u",
igbuio_intr_mode_preferred);