please help backporting some patches to stable release 21.11.2

[luca.boccassi at gmail.com]

Hi commit authors (and maintainers),

Despite being selected by the DPDK maintenance tool ./devtools/git-log-fixes.sh
I didn't apply following commits from DPDK main to 21.11
stable branch, as conflicts or build errors occur.

Can authors check your patches in the following list and either:
    - Backport your patches to the 21.11 branch, or
    - Indicate that the patch should not be backported

Please do either of the above by July the 8th.

You can find the a temporary work-in-progress branch of the coming 21.11.2
release at:
    https://github.com/kevintraynor/dpdk-stable
It is recommended to backport on top of that to minimize further conflicts or
misunderstandings.

Some notes on stable backports:

A backport should contain a reference to the DPDK main branch commit
in it's commit message in the following fashion:
    [ upstream commit <commit's dpdk main branch SHA-1 checksum> ]

For example:
    https://git.dpdk.org/dpdk-stable/commit/?h=18.11&id=d90e6ae6f936ecdc2fd3811ff9f26aec7f3c06eb

When sending the backported patch, please indicate the target branch in the
subject line, as we have multiple branches, for example:
    [PATCH 21.11] foo/bar: fix baz

With git format-patch, this can be achieved by appending the parameter:
    --subject-prefix='PATCH 21.11'

Send the backported patch to "stable at dpdk.org" but not "dev at dpdk.org".

FYI, branch 21.11 is located at tree:
   https://git.dpdk.org/dpdk-stable

Thanks.

Luca Boccassi

---
1907ce4bae  Yuan Wang        examples/vhost: fix retry logic on Rx path