Re: [dpdk-dev] Ports not detected by IGB_UIO in DPDK 1.7.1 in QEMU_KVM environment

[Bruce Richardson <bruce.richardson@intel.com>]

On Wed, Nov 05, 2014 at 03:28:13PM +0530, Manoj Viswanath wrote:
> Hi,
> 
> I have a DPDK application running on QEMU-KVM environment using DPDK 1.6.0.
> I am trying to port the same to DPDK version 1.7.1.
> 
> I am using Virt-manager GUI to assign e1000 emulated port to the VM. This
> works fine in DPDK 1.6.0. The device is identified by IGB_UIO and
> initialized by my application as expected.
> 
> However in case of DPDK 1.7.1, the emulated e1000 devices do not seem to be
> recognized.
> Following is my analysis:
> 
> 1. The API pci_get_uio_dev() is returning ERROR. This is called from
> pci_uio_map_resource() in the flow of PCI PROBE [rte_eal_pci_probe()].
> 
> 2. Due to this, the PCI device is not getting mapped to the correct driver
> (EM
> ​ Driver​
> ).
> 
> 3. The reason for the error in [1] appears to be that "uio" sub-directory
> doesn't seem to be correctly created for interfaces assigned to this VM.
> 
> 4. Upon further analysis i found that IGB_UIO probe function
> ["igbuio_pci_probe()"] is not getting triggered indicating the port has *not
> been assigned* to the IGB_UIO.
> 
> Kindly refer to the attachments:-
> - "Output of sys-bus-pci-devices" - indicating "uio" subdirectory not
> created for PCI devices in case of DPDK 1.7.1
> - "Output of lspci -v" - indicating device not bound to driver in case of
> DPDK 1.7.1
> - IGB_UIO init log snippet - indicating PCI devices not detected and
> initialized by IGB_UIO in case of DPDK 1.7.1
> - CONFIG file used for DPDK compilation
> 
> Not sure what has changed between 1.6.0 and 1.7.1 which is impacting this.
> 
> Could someone throw light in this regard as to what i may be missing ?
> 
> Thanks in advance.
> 
> Regards,
> Manoj

Hi Manoj,

can you perhaps give some details on how you were binding the device to the uio
module both for 1.6 and for 1.7?

/Bruce