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From: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com>
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Date: Mon, 9 Oct 2017 16:57:42 +0530
Message-ID: <ec0789412920fc26e662adfe4c6e0a6c@mail.gmail.com>
Subject: After re-enabling TSO, not seeing TSO pkts until restart iperf command
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Can someone please confirm whether this is expected behavior?

Why am I not able to see TSO pkts until I re-start iperf session?



Steps to reproduce:-



1. Load if_bnxt (or any other NIC) driver and assign IP

2. start iperf TCP traffic

3. Capture Tx pkts (command: tcpdump -i bnxt0), I can see > 60K length 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.