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Diffstat (limited to 'doc/guides/nics/mlx4.rst')
| -rw-r--r-- | doc/guides/nics/mlx4.rst | 63 |
1 files changed, 23 insertions, 40 deletions
diff --git a/doc/guides/nics/mlx4.rst b/doc/guides/nics/mlx4.rst index 98b97166..4a57c7a6 100644 --- a/doc/guides/nics/mlx4.rst +++ b/doc/guides/nics/mlx4.rst @@ -1,32 +1,6 @@ -.. BSD LICENSE +.. SPDX-License-Identifier: BSD-3-Clause Copyright 2012 6WIND S.A. - Copyright 2015 Mellanox - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in - the documentation and/or other materials provided with the - distribution. - * Neither the name of 6WIND S.A. nor the names of its - contributors may be used to endorse or promote products derived - from this software without specific prior written permission. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + Copyright 2015 Mellanox Technologies, Ltd MLX4 poll mode driver library ============================= @@ -98,9 +72,10 @@ These options can be modified in the ``.config`` file. missing with ``ldd(1)``. It works by moving these dependencies to a purpose-built rdma-core "glue" - plug-in, which must either be installed in ``CONFIG_RTE_EAL_PMD_PATH`` if - set, or in a standard location for the dynamic linker (e.g. ``/lib``) if - left to the default empty string (``""``). + plug-in which must either be installed in a directory whose name is based + on ``CONFIG_RTE_EAL_PMD_PATH`` suffixed with ``-glue`` if set, or in a + standard location for the dynamic linker (e.g. ``/lib``) if left to the + default empty string (``""``). This option has no performance impact. @@ -110,14 +85,6 @@ These options can be modified in the ``.config`` file. adds additional run-time checks and debugging messages at the cost of lower performance. -- ``CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE`` (default **8**) - - Maximum number of cached memory pools (MPs) per TX queue. Each MP from - which buffers are to be transmitted must be associated to memory regions - (MRs). This is a slow operation that must be cached. - - This value is always 1 for RX queues since they use a single MP. - Environment variables ~~~~~~~~~~~~~~~~~~~~~ @@ -168,6 +135,16 @@ below. following limitation: VLAN filtering is not supported with this mode. This is the recommended mode in case VLAN filter is not needed. +Limitations +----------- + +- CRC stripping is supported by default and always reported as "true". + The ability to enable/disable CRC stripping requires OFED version + 4.3-1.5.0.0 and above or rdma-core version v18 and above. + +- TSO (Transmit Segmentation Offload) is supported in OFED version + 4.4 and above. + Prerequisites ------------- @@ -236,7 +213,7 @@ Current RDMA core package and Linux kernel (recommended) Mellanox OFED as a fallback ~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- `Mellanox OFED`_ version: **4.2, 4.3**. +- `Mellanox OFED`_ version: **4.3, 4.4**. - firmware version: **2.42.5000** and above. .. _`Mellanox OFED`: http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux_sw_drivers @@ -396,6 +373,12 @@ Performance tuning The XXX can be different on different systems. Make sure to configure according to the setpci output. +6. To minimize overhead of searching Memory Regions: + + - '--socket-mem' is recommended to pin memory by predictable amount. + - Configure per-lcore cache when creating Mempools for packet buffer. + - Refrain from dynamically allocating/freeing memory in run-time. + Usage example ------------- |