rx_mpps = stats.rx_pps / 1000000
   Nit: not so important, but you can use _ as a comma separator to make
bigger numbers more readable. ie. 1_000_000.

   Args:
> +            testpmd: The testpmd shell to use for forwarding packets
> +            frame_size: The size of the frame to transmit

Missing full stops.

Steps:
+            * Create a packet according to the frame size specified in the
test config.
+            * Transmit from the traffic generator's ports 0 and 1 at above
the expect
+            * Forward on TestPMD's interfaces 0 and 1 with 1 core.
+
+        Verify:
+            * The resulting MPPS forwarded is greater than
expected_mpps*(1-delta_tolerance)
Missing full stop on step 2 and verify.

Reviewed-by: Andrew Bailey <abailey@iol.unh.edu>