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From: Jun Hu <hujun.work@gmail.com>
Date: Wed, 27 Oct 2021 08:48:58 -0700
Message-ID: <CAEM4-kBiUPF67pnHo3O+7dC8yE8eSgiJ9ZOa4T1MwS-E+wmc6Q@mail.gmail.com>
Subject: Re: AF_XDP socket TX path interact with TC?
To: Jesper Dangaard Brouer <jbrouer@redhat.com>
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> What is your use-case for adding a TX-timestamp to the packet?
>
> --Jesper
my use case is rather simple, I want to use AF_XDP for traffic tester
type of application, essentially, this application generates testing
traffic, egress via NIC-1, goes into a DUT, and DUT forward the
traffic back into NIC-2, the application need to measure the DUT's
forwarding latency for each packet, so it needs to know the timestamp
of test traffic TX on NIC-1 and RX on NIC-2

                  +-----+
|---------------- | DUT |----------------|
|                 +-----+                |
|                                        |
|          +-------------------+         |
|  <-----  |                   |  <----  |
+----------|NIC-1        NIC-2 |---------+
           |                   |
           +-------------------+