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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2020 Intel Corporation.
NULL Poll Mode Driver
=====================
NULL PMD is a simple virtual driver mainly for testing. It always returns success for all packets for Rx/Tx.
On Rx it returns requested number of empty packets (all zero). On Tx it just frees all sent packets.
Usage
-----
.. code-block:: console
./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev net_null0 --vdev net_null1 -- -i
Runtime Configuration
---------------------
- ``copy`` [optional, default disabled]
It copies data of the packet before Rx/Tx. For Rx it uses another empty dummy mbuf for this.
.. code-block:: console
./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev "net_null0,copy=1" -- -i
- ``size`` [optional, default=64 bytes]
Custom packet length value to use.r
If ``copy`` is enabled, this is the length of copy operation.
.. code-block:: console
./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 --vdev "net_null0,size=256" -- -i
- ``no-rx`` [optional, default disabled]
Makes PMD more like ``/dev/null``. On Rx no packets received, on Tx all packets are freed.
This option can't co-exist with ``copy`` option.
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