projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| f67539c2 TL |
1 | .. SPDX-License-Identifier: BSD-3-Clause |
| 2 | Copyright(c) 2020 Intel Corporation. | |
| 3 | ||
| 4 | NULL Poll Mode Driver | |
| 5 | ===================== | |
| 6 | ||
| 7 | NULL PMD is a simple virtual driver mainly for testing. It always returns success for all packets for Rx/Tx. | |
| 8 | ||
| 9 | On Rx it returns requested number of empty packets (all zero). On Tx it just frees all sent packets. | |
| 10 | ||
| 11 | ||
| 12 | Usage | |
| 13 | ----- | |
| 14 | ||
| 15 | .. code-block:: console | |
| 16 | ||
| 17 | $RTE_TARGET/app/testpmd -l 0-3 -n 4 --vdev net_null0 --vdev net_null1 -- -i | |
| 18 | ||
| 19 | ||
| 20 | Runtime Config Options | |
| 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 | $RTE_TARGET/app/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 | $RTE_TARGET/app/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. |