1.. SPDX-License-Identifier: BSD-3-Clause 2 Copyright(c) 2020 Intel Corporation. 3 4NULL Poll Mode Driver 5===================== 6 7NULL PMD is a simple virtual driver mainly for testing. It always returns success for all packets for Rx/Tx. 8 9On Rx it returns requested number of empty packets (all zero). On Tx it just frees all sent packets. 10 11 12Usage 13----- 14 15.. code-block:: console 16 17 ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev net_null0 --vdev net_null1 -- -i 18 19 20Runtime Configuration 21--------------------- 22 23- ``copy`` [optional, default disabled] 24 25 It copies data of the packet before Rx/Tx. For Rx it uses another empty dummy mbuf for this. 26 27.. code-block:: console 28 29 ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev "net_null0,copy=1" -- -i 30 31- ``size`` [optional, default=64 bytes] 32 33 Custom packet length value to use.r 34 If ``copy`` is enabled, this is the length of copy operation. 35 36.. code-block:: console 37 38 ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev "net_null0,size=256" -- -i 39 40- ``no-rx`` [optional, default disabled] 41 42 Makes PMD more like ``/dev/null``. On Rx no packets received, on Tx all packets are freed. 43 This option can't co-exist with ``copy`` option. 44