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

Reeve Yang reeve.yang at gmail.com
Thu Jun 6 23:26:27 CEST 2019


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*


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