[Bug 222775] After re-enabling TSO, not seeing TSO pkts until restart iperf command

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222775

            Bug ID: 222775
           Summary: After re-enabling TSO, not seeing TSO pkts until
                    restart iperf command
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bhargava.marreddy at broadcom.com

Staps to reproduce:-

1. Load if_bnxt driver
2. start iperf TCP traffic
3. Capture Tx pkts (command: tcpdump -i bnxt0), I can see > 60K lengh pkts.
4. Disable tso (command: ifconfig bnxt0 -tso)
5. Capture Tx pkts (command: tcpdump -i bnxt0).
   Max pkt length seen is 1440 (non-tso pkts)
6. Enable TSO (command: ifconfig bnxt0 -tso)
7. Capture Tx pkts (command: tcpdump -i bnxt0).
   Max pkt length seen is still 1440 (I was expecting TSO pkts here).
8. Terminate iperf sessions and start again.
   Now, I can see TSO pkts.

Can someone please confirm whether this is expected behavior? 
Why am I not able to see TSO pkts untill I re-start iperf session?

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