[dpdk-dev] rte_eth_dev_count() returns 0 with ENA device

[Reeve Yang]

some followup ... I debugged more, it looks like rte_pci_probe is not
happening, so the rte_eth_dev_allocate is not called at all ..., buy
why is that? I ran testpmd, it shows no probed ethernet device.

# /opt/bluecoat/sslv/bin/testpmd testpmd -n 2 -l 2-3 -w 0000:00:04.0
-m 256 -- -i
EAL: Detected 48 lcore(s)
EAL: Multi-process socket /var/run/.rte_unix
EAL: Probing VFIO support...
testpmd: No probed ethernet devices
Interactive-mode selected
...

Any help is greatly appreciated

On Thu, Jun 6, 2019 at 2:26 PM Reeve Yang <reeve.yang at gmail.com> wrote:
>
> Hi Gurus,
>
> I'm trying to bring VM under Amzaon EC2 R4.16xlarge instance, so the
> ethernet device is uising Amazon ENA driver. The kernel is 3.10, dpdk
> is 18.02. All ether device are bound successfully, but for some
> reason, the DPDK data path cannot be initialized because
> rte_eth_dev_count() always returns zero. Can someone shed some lights?
> Thanks.
>
> I'm pretty sure the VM instance is set up correctly in terms ENA enabled.
>
> Below are some  details:
> # modinfo ena
> filename:
> /lib/modules/3.10.0-693.11.6.el7.228052.x86_64/kernel/drivers/net/ethernet/amazon/ena/ena.ko.xz
> version:        1.0.2
> license:        GPL
> description:    Elastic Network Adapter (ENA)
> author:         Amazon.com, Inc. or its affiliates
> rhelversion:    7.4
>
> # lspci -vt
> -[0000:00]-+-00.0  Intel Corporation 440FX - 82441FX PMC [Natoma]
>            +-01.0  Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
>            +-01.1  Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
>            +-01.3  Intel Corporation 82371AB/EB/MB PIIX4 ACPI
>            +-02.0  Cirrus Logic GD 5446
>            +-03.0  Device 1d0f:ec20
>            +-04.0  Device 1d0f:ec20
>            +-05.0  Device 1d0f:ec20
>            +-06.0  Device 1d0f:ec20
>            +-07.0  Device 1d0f:ec20
>            +-08.0  Device 1d0f:ec20
>            +-09.0  Device 1d0f:ec20
>            +-0a.0  Device 1d0f:ec20
>            +-0b.0  Device 1d0f:ec20
>            \-1f.0  XenSource, Inc. Xen Platform Device
> # dpdk-devbind.py -s
>
> Network devices using DPDK-compatible driver
> ============================================
> 0000:00:04.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:05.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:06.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:07.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:08.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:09.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:0a.0 'Device ec20' drv=igb_uio unused=ena
> 0000:00:0b.0 'Device ec20' drv=igb_uio unused=ena
>
> Network devices using kernel driver
> ===================================
> 0000:00:03.0 'Device ec20' if=nic0_0 drv=ena unused=igb_uio *Active*