[Bug 933] Issue with parsing devargs syntax on Hyper-V platforms with DPDK-21.11

[Bug 933] Issue with parsing devargs syntax on Hyper-V platforms with DPDK-21.11

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=933

            Bug ID: 933
           Summary: Issue with parsing devargs syntax on Hyper-V platforms
                    with DPDK-21.11
           Product: DPDK
           Version: 21.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: madhuker.mythri@oracle.com
  Target Milestone: ---

Hi,

On Hyper-V(Azure) environment with/without Accelarated mode, we are seeing
segmentation-fault issues while running secondary process of DPDK with legacy
syntax of arguments on DPDK-21.11 version.
Whereas the same arguments were working well till DPDK-21.08 version, only with
the latest DPDK-21.11 this issue occurs.

Here is the EAL argument syntax for net_failsafe PMD:
   --vdev net_vdev_netvsc0,iface=s1p0 --block 032e:00:02.0

As per analysis on this, found that new feature got introduced "Enabled new
devargs parser" in DPDK-21.11 version. As part of this new feature found that
this DPDK patch caused this issue:
https://patchwork.dpdk.org/project/dpdk/patch/1618283653-16510-6-git-send-email-xuemingl@nvidia.com/

When we remove this patch code, we do not see any issues with loading
primary/secondary processes. So, looks like issue in identifying the new global
syntax and fallback to legacy syntax w.r.t to Hyper-V platforms.

Even we tried to give new syntax as mentioned in this patch to load this "vdev"
based bus as follows, but still seeing issues.
     -a bus=vdev,name=vdev_netvsc/class=eth/driver=vdev_netvsc

So, this is an issue with legacy syntax arguments with "--vdev" on DPDK-21.11.

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