Re: [dpdk-dev] DPDK PDUMP Issue

[Stephen Hemminger <stephen@networkplumber.org>]

On Tue, 14 Jul 2020 08:40:55 +0000
Dikshant Chitkara <dchitkara@Airspan.com> wrote:

> Hi Team,
> 
> We are facing an issue w.r.t to using DPDK PDUMP utility and want to check if you can help us in this regard.
> 
> This issue is specific to DPDK 19.05 version or may  be newer versions and was not found on DPDK 18.08 version.
> 
> The issue is that when we built DPDK in shared library mode and try to run PDUMP we get following error on PDUMP console:
> 
> EAL: Failed to hotplug add device
> EAL: Error - exiting with code: 1
>   Cause: vdev creation failed
> 
> On Debugging above error message, I found that inside rte_dev_probe() function in the file  lib/librte_eal/common/eal_common_dev.c , req.result = -14 which is non-zero value and points to enum EFAULT (Bad address) value, thus leading to above error.
> 
> However, when I ran PDUMP in DPDK 18.08, I did not observe any such issue and it worked fine.
> 
> DPDK was built with following flags set in config/common_base file:
> 
> CONFIG_RTE_LIBRTE_PMD_PCAP=y
> CONFIG_RTE_LIBRTE_PDUMP=y
> 
> I ran PDUMP with testpmd as primary application and was trying to send some traffic on the Ethernet dpdk port using testpmd and capture it using pdump.
> 
> Attached are the logs for both testpmd and pdump in both DPDK19_05 and DPDK_18_08 version for your reference.
> 
> Let us know if you can help in this regard.
> 
> Thanks,
> Dikshant
> 

Pdump runs as secondary process, what is your primary process.
Is the secondary process using the same exact versions of DPDK and libraries as the primary process?
The secondary process needs access to the same devices and drivers as the primary process to work.