please help backporting some patches to stable release 20.11.9

[Jiawen Wu]

> 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 20.11
> stable branch, as conflicts or build errors occur.
> 
> Can authors check your patches in the following list and either:
>     - Backport your patches to the 20.11 branch, or
>     - Indicate that the patch should not be backported
> 
> Please do either of the above by 2023/07/21.
> 
> You can find the a temporary work-in-progress branch of the coming 20.11.9
> release at:
>     https://github.com/bluca/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 20.11] foo/bar: fix baz
> 
> With git format-patch, this can be achieved by appending the parameter:
>     --subject-prefix='PATCH 20.11'
> 
> Send the backported patch to "stable at dpdk.org" but not "dev at dpdk.org".
> 
> FYI, branch 20.11 is located at tree:
>    https://git.dpdk.org/dpdk-stable
> 
> Thanks.
> 
> Luca Boccassi
> 
> ---


> 5e170dd8b6  Jiawen Wu        net/txgbe: fix blocking system events

Please drop this patch in stable 20.11.9, thanks.