[dpdk-dev] [PATCH 00/10] igb_uio patches

Neil Horman nhorman at tuxdriver.com
Wed Jun 11 12:30:05 CEST 2014


On Tue, Jun 10, 2014 at 01:47:09PM -0700, Stephen Hemminger wrote:
> On Tue, 10 Jun 2014 19:26:08 +0000
> "Carew, Alan" <alan.carew at intel.com> wrote:
> 
> > One alternative for us is then to take Neil Horman's idea of scanning /sys/bus/pci/devices/<D:B:D.F>/msi_irqs/
> > This gives us at least (MSI | MSI-X) | INT-X, however the Virtio specification mentions MSI-X explicitly for determining the correct offset and might not address the underlying problem my patch set was addressing, I have not tried Virtio with MSI.
> 
> MSI doesn't work with virtio. pci_enable_msi() returns error. The device
> does not report MSI capability.
> 
/sys/bus/pci/devices/<device>/irq

also indicates which legacy irq is assigned to a given device

Neil



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