f6242d0655
Since rdma-core glue libraries are intrinsically tied to their respective PMDs and used as internal plug-ins, their presence in the default search path among other system libraries for the dynamic linker is not necessarily desired. This commit enables their installation and subsequent look-up at run time in RTE_EAL_PMD_PATH if configured to a nonempty string. This path can also be overridden by environment variables MLX[45]_GLUE_PATH. Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
518 lines
17 KiB
ReStructuredText
518 lines
17 KiB
ReStructuredText
.. BSD LICENSE
|
|
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.
|
|
|
|
MLX4 poll mode driver library
|
|
=============================
|
|
|
|
The MLX4 poll mode driver library (**librte_pmd_mlx4**) implements support
|
|
for **Mellanox ConnectX-3** and **Mellanox ConnectX-3 Pro** 10/40 Gbps adapters
|
|
as well as their virtual functions (VF) in SR-IOV context.
|
|
|
|
Information and documentation about this family of adapters can be found on
|
|
the `Mellanox website <http://www.mellanox.com>`_. Help is also provided by
|
|
the `Mellanox community <http://community.mellanox.com/welcome>`_.
|
|
|
|
There is also a `section dedicated to this poll mode driver
|
|
<http://www.mellanox.com/page/products_dyn?product_family=209&mtag=pmd_for_dpdk>`_.
|
|
|
|
.. note::
|
|
|
|
Due to external dependencies, this driver is disabled by default. It must
|
|
be enabled manually by setting ``CONFIG_RTE_LIBRTE_MLX4_PMD=y`` and
|
|
recompiling DPDK.
|
|
|
|
Implementation details
|
|
----------------------
|
|
|
|
Most Mellanox ConnectX-3 devices provide two ports but expose a single PCI
|
|
bus address, thus unlike most drivers, librte_pmd_mlx4 registers itself as a
|
|
PCI driver that allocates one Ethernet device per detected port.
|
|
|
|
For this reason, one cannot white/blacklist a single port without also
|
|
white/blacklisting the others on the same device.
|
|
|
|
Besides its dependency on libibverbs (that implies libmlx4 and associated
|
|
kernel support), librte_pmd_mlx4 relies heavily on system calls for control
|
|
operations such as querying/updating the MTU and flow control parameters.
|
|
|
|
For security reasons and robustness, this driver only deals with virtual
|
|
memory addresses. The way resources allocations are handled by the kernel
|
|
combined with hardware specifications that allow it to handle virtual memory
|
|
addresses directly ensure that DPDK applications cannot access random
|
|
physical memory (or memory that does not belong to the current process).
|
|
|
|
This capability allows the PMD to coexist with kernel network interfaces
|
|
which remain functional, although they stop receiving unicast packets as
|
|
long as they share the same MAC address.
|
|
|
|
Compiling librte_pmd_mlx4 causes DPDK to be linked against libibverbs.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
Compilation options
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
These options can be modified in the ``.config`` file.
|
|
|
|
- ``CONFIG_RTE_LIBRTE_MLX4_PMD`` (default **n**)
|
|
|
|
Toggle compilation of librte_pmd_mlx4 itself.
|
|
|
|
- ``CONFIG_RTE_LIBRTE_MLX4_DLOPEN_DEPS`` (default **n**)
|
|
|
|
Build PMD with additional code to make it loadable without hard
|
|
dependencies on **libibverbs** nor **libmlx4**, which may not be installed
|
|
on the target system.
|
|
|
|
In this mode, their presence is still required for it to run properly,
|
|
however their absence won't prevent a DPDK application from starting (with
|
|
``CONFIG_RTE_BUILD_SHARED_LIB`` disabled) and they won't show up as
|
|
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 (``""``).
|
|
|
|
This option has no performance impact.
|
|
|
|
- ``CONFIG_RTE_LIBRTE_MLX4_DEBUG`` (default **n**)
|
|
|
|
Toggle debugging code and stricter compilation flags. Enabling this option
|
|
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
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
- ``MLX4_GLUE_PATH``
|
|
|
|
A list of directories in which to search for the rdma-core "glue" plug-in,
|
|
separated by colons or semi-colons.
|
|
|
|
Only matters when compiled with ``CONFIG_RTE_LIBRTE_MLX4_DLOPEN_DEPS``
|
|
enabled and most useful when ``CONFIG_RTE_EAL_PMD_PATH`` is also set,
|
|
since ``LD_LIBRARY_PATH`` has no effect in this case.
|
|
|
|
Run-time configuration
|
|
~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
- librte_pmd_mlx4 brings kernel network interfaces up during initialization
|
|
because it is affected by their state. Forcing them down prevents packets
|
|
reception.
|
|
|
|
- **ethtool** operations on related kernel interfaces also affect the PMD.
|
|
|
|
- ``port`` parameter [int]
|
|
|
|
This parameter provides a physical port to probe and can be specified multiple
|
|
times for additional ports. All ports are probed by default if left
|
|
unspecified.
|
|
|
|
Kernel module parameters
|
|
~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
The **mlx4_core** kernel module has several parameters that affect the
|
|
behavior and/or the performance of librte_pmd_mlx4. Some of them are described
|
|
below.
|
|
|
|
- **num_vfs** (integer or triplet, optionally prefixed by device address
|
|
strings)
|
|
|
|
Create the given number of VFs on the specified devices.
|
|
|
|
- **log_num_mgm_entry_size** (integer)
|
|
|
|
Device-managed flow steering (DMFS) is required by DPDK applications. It is
|
|
enabled by using a negative value, the last four bits of which have a
|
|
special meaning.
|
|
|
|
- **-1**: force device-managed flow steering (DMFS).
|
|
- **-7**: configure optimized steering mode to improve performance with the
|
|
following limitation: VLAN filtering is not supported with this mode.
|
|
This is the recommended mode in case VLAN filter is not needed.
|
|
|
|
Prerequisites
|
|
-------------
|
|
|
|
This driver relies on external libraries and kernel drivers for resources
|
|
allocations and initialization. The following dependencies are not part of
|
|
DPDK and must be installed separately:
|
|
|
|
- **libibverbs** (provided by rdma-core package)
|
|
|
|
User space verbs framework used by librte_pmd_mlx4. This library provides
|
|
a generic interface between the kernel and low-level user space drivers
|
|
such as libmlx4.
|
|
|
|
It allows slow and privileged operations (context initialization, hardware
|
|
resources allocations) to be managed by the kernel and fast operations to
|
|
never leave user space.
|
|
|
|
- **libmlx4** (provided by rdma-core package)
|
|
|
|
Low-level user space driver library for Mellanox ConnectX-3 devices,
|
|
it is automatically loaded by libibverbs.
|
|
|
|
This library basically implements send/receive calls to the hardware
|
|
queues.
|
|
|
|
- **Kernel modules**
|
|
|
|
They provide the kernel-side verbs API and low level device drivers that
|
|
manage actual hardware initialization and resources sharing with user
|
|
space processes.
|
|
|
|
Unlike most other PMDs, these modules must remain loaded and bound to
|
|
their devices:
|
|
|
|
- mlx4_core: hardware driver managing Mellanox ConnectX-3 devices.
|
|
- mlx4_en: Ethernet device driver that provides kernel network interfaces.
|
|
- mlx4_ib: InifiniBand device driver.
|
|
- ib_uverbs: user space driver for verbs (entry point for libibverbs).
|
|
|
|
- **Firmware update**
|
|
|
|
Mellanox OFED releases include firmware updates for ConnectX-3 adapters.
|
|
|
|
Because each release provides new features, these updates must be applied to
|
|
match the kernel modules and libraries they come with.
|
|
|
|
.. note::
|
|
|
|
Both libraries are BSD and GPL licensed. Linux kernel modules are GPL
|
|
licensed.
|
|
|
|
Depending on system constraints and user preferences either RDMA core library
|
|
with a recent enough Linux kernel release (recommended) or Mellanox OFED,
|
|
which provides compatibility with older releases.
|
|
|
|
Current RDMA core package and Linux kernel (recommended)
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
- Minimal Linux kernel version: 4.14.
|
|
- Minimal RDMA core version: v15 (see `RDMA core installation documentation`_).
|
|
|
|
.. _`RDMA core installation documentation`: https://raw.githubusercontent.com/linux-rdma/rdma-core/master/README.md
|
|
|
|
.. _Mellanox_OFED_as_a_fallback:
|
|
|
|
Mellanox OFED as a fallback
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
- `Mellanox OFED`_ version: **4.2, 4.3**.
|
|
- firmware version: **2.42.5000** and above.
|
|
|
|
.. _`Mellanox OFED`: http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux_sw_drivers
|
|
|
|
.. note::
|
|
|
|
Several versions of Mellanox OFED are available. Installing the version
|
|
this DPDK release was developed and tested against is strongly
|
|
recommended. Please check the `prerequisites`_.
|
|
|
|
Installing Mellanox OFED
|
|
^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
1. Download latest Mellanox OFED.
|
|
|
|
2. Install the required libraries and kernel modules either by installing
|
|
only the required set, or by installing the entire Mellanox OFED:
|
|
|
|
For bare metal use:
|
|
|
|
.. code-block:: console
|
|
|
|
./mlnxofedinstall --dpdk --upstream-libs
|
|
|
|
For SR-IOV hypervisors use:
|
|
|
|
.. code-block:: console
|
|
|
|
./mlnxofedinstall --dpdk --upstream-libs --enable-sriov --hypervisor
|
|
|
|
For SR-IOV virtual machine use:
|
|
|
|
.. code-block:: console
|
|
|
|
./mlnxofedinstall --dpdk --upstream-libs --guest
|
|
|
|
3. Verify the firmware is the correct one:
|
|
|
|
.. code-block:: console
|
|
|
|
ibv_devinfo
|
|
|
|
4. Set all ports links to Ethernet, follow instructions on the screen:
|
|
|
|
.. code-block:: console
|
|
|
|
connectx_port_config
|
|
|
|
5. Continue with :ref:`section 2 of the Quick Start Guide <QSG_2>`.
|
|
|
|
Supported NICs
|
|
--------------
|
|
|
|
* Mellanox(R) ConnectX(R)-3 Pro 40G MCX354A-FCC_Ax (2*40G)
|
|
|
|
.. _qsg:
|
|
|
|
Quick Start Guide
|
|
-----------------
|
|
|
|
1. Set all ports links to Ethernet
|
|
|
|
.. code-block:: console
|
|
|
|
PCI=<NIC PCI address>
|
|
echo eth > "/sys/bus/pci/devices/$PCI/mlx4_port0"
|
|
echo eth > "/sys/bus/pci/devices/$PCI/mlx4_port1"
|
|
|
|
.. note::
|
|
|
|
If using Mellanox OFED one can permanently set the port link
|
|
to Ethernet using connectx_port_config tool provided by it.
|
|
:ref:`Mellanox_OFED_as_a_fallback`:
|
|
|
|
.. _QSG_2:
|
|
|
|
2. In case of bare metal or hypervisor, configure optimized steering mode
|
|
by adding the following line to ``/etc/modprobe.d/mlx4_core.conf``:
|
|
|
|
.. code-block:: console
|
|
|
|
options mlx4_core log_num_mgm_entry_size=-7
|
|
|
|
.. note::
|
|
|
|
If VLAN filtering is used, set log_num_mgm_entry_size=-1.
|
|
Performance degradation can occur on this case.
|
|
|
|
3. Restart the driver:
|
|
|
|
.. code-block:: console
|
|
|
|
/etc/init.d/openibd restart
|
|
|
|
or:
|
|
|
|
.. code-block:: console
|
|
|
|
service openibd restart
|
|
|
|
4. Compile DPDK and you are ready to go. See instructions on
|
|
:ref:`Development Kit Build System <Development_Kit_Build_System>`
|
|
|
|
Performance tuning
|
|
------------------
|
|
|
|
1. Verify the optimized steering mode is configured:
|
|
|
|
.. code-block:: console
|
|
|
|
cat /sys/module/mlx4_core/parameters/log_num_mgm_entry_size
|
|
|
|
2. Use the CPU near local NUMA node to which the PCIe adapter is connected,
|
|
for better performance. For VMs, verify that the right CPU
|
|
and NUMA node are pinned according to the above. Run:
|
|
|
|
.. code-block:: console
|
|
|
|
lstopo-no-graphics
|
|
|
|
to identify the NUMA node to which the PCIe adapter is connected.
|
|
|
|
3. If more than one adapter is used, and root complex capabilities allow
|
|
to put both adapters on the same NUMA node without PCI bandwidth degradation,
|
|
it is recommended to locate both adapters on the same NUMA node.
|
|
This in order to forward packets from one to the other without
|
|
NUMA performance penalty.
|
|
|
|
4. Disable pause frames:
|
|
|
|
.. code-block:: console
|
|
|
|
ethtool -A <netdev> rx off tx off
|
|
|
|
5. Verify IO non-posted prefetch is disabled by default. This can be checked
|
|
via the BIOS configuration. Please contact you server provider for more
|
|
information about the settings.
|
|
|
|
.. note::
|
|
|
|
On some machines, depends on the machine integrator, it is beneficial
|
|
to set the PCI max read request parameter to 1K. This can be
|
|
done in the following way:
|
|
|
|
To query the read request size use:
|
|
|
|
.. code-block:: console
|
|
|
|
setpci -s <NIC PCI address> 68.w
|
|
|
|
If the output is different than 3XXX, set it by:
|
|
|
|
.. code-block:: console
|
|
|
|
setpci -s <NIC PCI address> 68.w=3XXX
|
|
|
|
The XXX can be different on different systems. Make sure to configure
|
|
according to the setpci output.
|
|
|
|
Usage example
|
|
-------------
|
|
|
|
This section demonstrates how to launch **testpmd** with Mellanox ConnectX-3
|
|
devices managed by librte_pmd_mlx4.
|
|
|
|
#. Load the kernel modules:
|
|
|
|
.. code-block:: console
|
|
|
|
modprobe -a ib_uverbs mlx4_en mlx4_core mlx4_ib
|
|
|
|
Alternatively if MLNX_OFED is fully installed, the following script can
|
|
be run:
|
|
|
|
.. code-block:: console
|
|
|
|
/etc/init.d/openibd restart
|
|
|
|
.. note::
|
|
|
|
User space I/O kernel modules (uio and igb_uio) are not used and do
|
|
not have to be loaded.
|
|
|
|
#. Make sure Ethernet interfaces are in working order and linked to kernel
|
|
verbs. Related sysfs entries should be present:
|
|
|
|
.. code-block:: console
|
|
|
|
ls -d /sys/class/net/*/device/infiniband_verbs/uverbs* | cut -d / -f 5
|
|
|
|
Example output:
|
|
|
|
.. code-block:: console
|
|
|
|
eth2
|
|
eth3
|
|
eth4
|
|
eth5
|
|
|
|
#. Optionally, retrieve their PCI bus addresses for whitelisting:
|
|
|
|
.. code-block:: console
|
|
|
|
{
|
|
for intf in eth2 eth3 eth4 eth5;
|
|
do
|
|
(cd "/sys/class/net/${intf}/device/" && pwd -P);
|
|
done;
|
|
} |
|
|
sed -n 's,.*/\(.*\),-w \1,p'
|
|
|
|
Example output:
|
|
|
|
.. code-block:: console
|
|
|
|
-w 0000:83:00.0
|
|
-w 0000:83:00.0
|
|
-w 0000:84:00.0
|
|
-w 0000:84:00.0
|
|
|
|
.. note::
|
|
|
|
There are only two distinct PCI bus addresses because the Mellanox
|
|
ConnectX-3 adapters installed on this system are dual port.
|
|
|
|
#. Request huge pages:
|
|
|
|
.. code-block:: console
|
|
|
|
echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages/nr_hugepages
|
|
|
|
#. Start testpmd with basic parameters:
|
|
|
|
.. code-block:: console
|
|
|
|
testpmd -l 8-15 -n 4 -w 0000:83:00.0 -w 0000:84:00.0 -- --rxq=2 --txq=2 -i
|
|
|
|
Example output:
|
|
|
|
.. code-block:: console
|
|
|
|
[...]
|
|
EAL: PCI device 0000:83:00.0 on NUMA socket 1
|
|
EAL: probe driver: 15b3:1007 librte_pmd_mlx4
|
|
PMD: librte_pmd_mlx4: PCI information matches, using device "mlx4_0" (VF: false)
|
|
PMD: librte_pmd_mlx4: 2 port(s) detected
|
|
PMD: librte_pmd_mlx4: port 1 MAC address is 00:02:c9:b5:b7:50
|
|
PMD: librte_pmd_mlx4: port 2 MAC address is 00:02:c9:b5:b7:51
|
|
EAL: PCI device 0000:84:00.0 on NUMA socket 1
|
|
EAL: probe driver: 15b3:1007 librte_pmd_mlx4
|
|
PMD: librte_pmd_mlx4: PCI information matches, using device "mlx4_1" (VF: false)
|
|
PMD: librte_pmd_mlx4: 2 port(s) detected
|
|
PMD: librte_pmd_mlx4: port 1 MAC address is 00:02:c9:b5:ba:b0
|
|
PMD: librte_pmd_mlx4: port 2 MAC address is 00:02:c9:b5:ba:b1
|
|
Interactive-mode selected
|
|
Configuring Port 0 (socket 0)
|
|
PMD: librte_pmd_mlx4: 0x867d60: TX queues number update: 0 -> 2
|
|
PMD: librte_pmd_mlx4: 0x867d60: RX queues number update: 0 -> 2
|
|
Port 0: 00:02:C9:B5:B7:50
|
|
Configuring Port 1 (socket 0)
|
|
PMD: librte_pmd_mlx4: 0x867da0: TX queues number update: 0 -> 2
|
|
PMD: librte_pmd_mlx4: 0x867da0: RX queues number update: 0 -> 2
|
|
Port 1: 00:02:C9:B5:B7:51
|
|
Configuring Port 2 (socket 0)
|
|
PMD: librte_pmd_mlx4: 0x867de0: TX queues number update: 0 -> 2
|
|
PMD: librte_pmd_mlx4: 0x867de0: RX queues number update: 0 -> 2
|
|
Port 2: 00:02:C9:B5:BA:B0
|
|
Configuring Port 3 (socket 0)
|
|
PMD: librte_pmd_mlx4: 0x867e20: TX queues number update: 0 -> 2
|
|
PMD: librte_pmd_mlx4: 0x867e20: RX queues number update: 0 -> 2
|
|
Port 3: 00:02:C9:B5:BA:B1
|
|
Checking link statuses...
|
|
Port 0 Link Up - speed 10000 Mbps - full-duplex
|
|
Port 1 Link Up - speed 40000 Mbps - full-duplex
|
|
Port 2 Link Up - speed 10000 Mbps - full-duplex
|
|
Port 3 Link Up - speed 40000 Mbps - full-duplex
|
|
Done
|
|
testpmd>
|