[dpdk-dev] virtio PMD is not working with master version

[David Marchand]

On Thu, Feb 25, 2016 at 12:30 PM, Mauricio Vásquez
<mauricio.vasquezbernal at studenti.polito.it> wrote:
> ...
> EAL: PCI device 0000:00:04.0 on NUMA socket -1
> EAL:   probe driver: 1af4:1000 rte_virtio_pmd
> EAL:   PCI memory mapped at 0x7f892dc00000
> PMD: virtio_read_caps(): [40] skipping non VNDR cap id: 11
> PMD: virtio_read_caps(): no modern virtio pci device found.
> PMD: vtpci_init(): trying with legacy virtio pci.
> EAL: eal_parse_sysfs_value(): cannot open sysfs value
> /sys/bus/pci/devices/0000:00:04.0/uio/uio0/portio/port0/start
> EAL: pci_uio_ioport_map(): cannot parse portio start
> EAL: Error - exiting with code: 1
>   Cause: Requested device 0000:00:04.0 cannot be used
> ...

[snip]

> ...
> PMD: parse_sysfs_value(): parse_sysfs_value(): cannot open sysfs value
> /sys/bus/pci/devices/0000:00:04.0/uio/uio0/portio/port0/size
> PMD: virtio_resource_init_by_uio(): virtio_resource_init_by_uio(): cannot
> parse size
> PMD: virtio_resource_init_by_ioports(): PCI Port IO found start=0xc100 with
> size=0x20

[snip]

>
> According to git bisect it appears to be that it does not work anymore after
> the b8f04520ad71 ("virtio: use PCI ioport API") commit.

>From the logs, I would say I broke uio_pci_generic since we are in
"uio" case, but uio portio sysfs does not exist.
virtio pmd fell back to ioports discovery before my change.
Problem can be workaround for now by unbinding your device from
uio_pci_generic or on the contrary bind to igb_uio.

I've been sick at home, all this week.
Will see next week for a fix unless someone sends one.


-- 
David Marchand