[Bug 221919] ixl: TX queue hang when using TSO and having a high and mixed network load

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221919

            Bug ID: 221919
           Summary: ixl: TX queue hang when using TSO and having a high
                    and mixed network load
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nikita at elyzion.net

In my scenario, when having an hundred of iscsi sessions that are doing a load
of around 10Gib (but it happen with a smaller load less often too) of mixed
RX/TX, my XL710-DA2 cards start to flap with the following output in dmesg:

```
...
kernel: ixl0: WARNING: queue 4 appears to be hung!
kernel: ixl0: WARNING: Resetting!
kernel: ixl0: Malicious Driver Detection event 2 on TX queue 0, pf 
number 0
kernel: ixl0: MDD TX event is for this function! 
...
kernel: ixl0: Interface stopped DISTRIBUTING, possible flapping
...
```
(and then a lot iscsi session drop due to the flap)


It happens, during the network load, something like every 5min.

It seems to me to be related to TSO because when I have disabled it, the bug
was gone and I was unable to reproduce it anymore. Reenabling TSO make the bug
appearing again.

My FW : dev.ixl.0.fw_version: fw 5.0.40043 api 1.5 nvm 5.05 etid 800028a6 oem
1.262.0
But I also reproduced it with fw 4.33.31377 api 1.2 nvm 4.42

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