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33 The MLX5 poll mode driver library (**librte_pmd_mlx5**) provides support for
34 **Mellanox ConnectX-4** and **Mellanox ConnectX-4 Lx** families of
35 10/25/40/50/100 Gb/s adapters as well as their virtual functions (VF) in
38 Information and documentation about these adapters can be found on the
39 `Mellanox website <http://www.mellanox.com>`__. Help is also provided by the
40 `Mellanox community <http://community.mellanox.com/welcome>`__.
42 There is also a `section dedicated to this poll mode driver
43 <http://www.mellanox.com/page/products_dyn?product_family=209&mtag=pmd_for_dpdk>`__.
47 Due to external dependencies, this driver is disabled by default. It must
48 be enabled manually by setting ``CONFIG_RTE_LIBRTE_MLX5_PMD=y`` and
51 Implementation details
52 ----------------------
54 Besides its dependency on libibverbs (that implies libmlx5 and associated
55 kernel support), librte_pmd_mlx5 relies heavily on system calls for control
56 operations such as querying/updating the MTU and flow control parameters.
58 For security reasons and robustness, this driver only deals with virtual
59 memory addresses. The way resources allocations are handled by the kernel
60 combined with hardware specifications that allow it to handle virtual memory
61 addresses directly ensure that DPDK applications cannot access random
62 physical memory (or memory that does not belong to the current process).
64 This capability allows the PMD to coexist with kernel network interfaces
65 which remain functional, although they stop receiving unicast packets as
66 long as they share the same MAC address.
68 Enabling librte_pmd_mlx5 causes DPDK applications to be linked against
74 - Multiple TX and RX queues.
75 - Support for scattered TX and RX frames.
76 - IPv4, IPv6, TCPv4, TCPv6, UDPv4 and UDPv6 RSS on any number of queues.
77 - Several RSS hash keys, one for each flow type.
78 - Configurable RETA table.
79 - Support for multiple MAC addresses.
83 - RX CRC stripping configuration.
85 - Multicast promiscuous mode.
86 - Hardware checksum offloads.
87 - Flow director (RTE_FDIR_MODE_PERFECT and RTE_FDIR_MODE_PERFECT_MAC_VLAN).
88 - Secondary process TX is supported.
89 - KVM and VMware ESX SR-IOV modes are supported.
94 - Inner RSS for VXLAN frames is not supported yet.
95 - Port statistics through software counters only.
96 - Hardware checksum offloads for VXLAN inner header are not supported yet.
97 - Secondary process RX is not supported.
105 These options can be modified in the ``.config`` file.
107 - ``CONFIG_RTE_LIBRTE_MLX5_PMD`` (default **n**)
109 Toggle compilation of librte_pmd_mlx5 itself.
111 - ``CONFIG_RTE_LIBRTE_MLX5_DEBUG`` (default **n**)
113 Toggle debugging code and stricter compilation flags. Enabling this option
114 adds additional run-time checks and debugging messages at the cost of
117 - ``CONFIG_RTE_LIBRTE_MLX5_TX_MP_CACHE`` (default **8**)
119 Maximum number of cached memory pools (MPs) per TX queue. Each MP from
120 which buffers are to be transmitted must be associated to memory regions
121 (MRs). This is a slow operation that must be cached.
123 This value is always 1 for RX queues since they use a single MP.
125 Environment variables
126 ~~~~~~~~~~~~~~~~~~~~~
128 - ``MLX5_ENABLE_CQE_COMPRESSION``
130 A nonzero value lets ConnectX-4 return smaller completion entries to
131 improve performance when PCI backpressure is detected. It is most useful
132 for scenarios involving heavy traffic on many queues.
134 Since the additional software logic necessary to handle this mode can
135 lower performance when there is no backpressure, it is not enabled by
138 - ``MLX5_PMD_ENABLE_PADDING``
140 Enables HW packet padding in PCI bus transactions.
142 When packet size is cache aligned and CRC stripping is enabled, 4 fewer
143 bytes are written to the PCI bus. Enabling padding makes such packets
146 In cases where PCI bandwidth is the bottleneck, padding can improve
149 This is disabled by default since this can also decrease performance for
150 unaligned packet sizes.
152 Run-time configuration
153 ~~~~~~~~~~~~~~~~~~~~~~
155 - librte_pmd_mlx5 brings kernel network interfaces up during initialization
156 because it is affected by their state. Forcing them down prevents packets
159 - **ethtool** operations on related kernel interfaces also affect the PMD.
164 This driver relies on external libraries and kernel drivers for resources
165 allocations and initialization. The following dependencies are not part of
166 DPDK and must be installed separately:
170 User space Verbs framework used by librte_pmd_mlx5. This library provides
171 a generic interface between the kernel and low-level user space drivers
174 It allows slow and privileged operations (context initialization, hardware
175 resources allocations) to be managed by the kernel and fast operations to
176 never leave user space.
180 Low-level user space driver library for Mellanox ConnectX-4 devices,
181 it is automatically loaded by libibverbs.
183 This library basically implements send/receive calls to the hardware
186 - **Kernel modules** (mlnx-ofed-kernel)
188 They provide the kernel-side Verbs API and low level device drivers that
189 manage actual hardware initialization and resources sharing with user
192 Unlike most other PMDs, these modules must remain loaded and bound to
195 - mlx5_core: hardware driver managing Mellanox ConnectX-4 devices and
196 related Ethernet kernel network devices.
197 - mlx5_ib: InifiniBand device driver.
198 - ib_uverbs: user space driver for Verbs (entry point for libibverbs).
200 - **Firmware update**
202 Mellanox OFED releases include firmware updates for ConnectX-4 adapters.
204 Because each release provides new features, these updates must be applied to
205 match the kernel modules and libraries they come with.
209 Both libraries are BSD and GPL licensed. Linux kernel modules are GPL
212 Currently supported by DPDK:
214 - Mellanox OFED **3.1-1.0.3**, **3.1-1.5.7.1** or **3.2-2.0.0.0** depending
217 The following features are supported with version **3.1-1.5.7.1** and
220 - IPv6, UPDv6, TCPv6 RSS.
221 - RX checksum offloads.
224 The following features are supported with version **3.2-2.0.0.0** and
230 - RX CRC stripping configuration.
232 - Minimum firmware version:
234 With MLNX_OFED **3.1-1.0.3**:
236 - ConnectX-4: **12.12.1240**
237 - ConnectX-4 Lx: **14.12.1100**
239 With MLNX_OFED **3.1-1.5.7.1**:
241 - ConnectX-4: **12.13.0144**
242 - ConnectX-4 Lx: **14.13.0144**
244 With MLNX_OFED **3.2-2.0.0.0**:
246 - ConnectX-4: **12.14.2036**
247 - ConnectX-4 Lx: **14.14.2036**
249 Getting Mellanox OFED
250 ~~~~~~~~~~~~~~~~~~~~~
252 While these libraries and kernel modules are available on OpenFabrics
253 Alliance's `website <https://www.openfabrics.org/>`__ and provided by package
254 managers on most distributions, this PMD requires Ethernet extensions that
255 may not be supported at the moment (this is a work in progress).
258 <http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux>`__
259 includes the necessary support and should be used in the meantime. For DPDK,
260 only libibverbs, libmlx5, mlnx-ofed-kernel packages and firmware updates are
261 required from that distribution.
265 Several versions of Mellanox OFED are available. Installing the version
266 this DPDK release was developed and tested against is strongly
267 recommended. Please check the `prerequisites`_.
272 Compared to librte_pmd_mlx4 that implements a single RSS configuration per
273 port, librte_pmd_mlx5 supports per-protocol RSS configuration.
275 Since ``testpmd`` defaults to IP RSS mode and there is currently no
276 command-line parameter to enable additional protocols (UDP and TCP as well
277 as IP), the following commands must be entered from its CLI to get the same
278 behavior as librte_pmd_mlx4:
280 .. code-block:: console
283 > port config all rss all
289 This section demonstrates how to launch **testpmd** with Mellanox ConnectX-4
290 devices managed by librte_pmd_mlx5.
292 #. Load the kernel modules:
294 .. code-block:: console
296 modprobe -a ib_uverbs mlx5_core mlx5_ib
298 Alternatively if MLNX_OFED is fully installed, the following script can
301 .. code-block:: console
303 /etc/init.d/openibd restart
307 User space I/O kernel modules (uio and igb_uio) are not used and do
308 not have to be loaded.
310 #. Make sure Ethernet interfaces are in working order and linked to kernel
311 verbs. Related sysfs entries should be present:
313 .. code-block:: console
315 ls -d /sys/class/net/*/device/infiniband_verbs/uverbs* | cut -d / -f 5
319 .. code-block:: console
326 #. Optionally, retrieve their PCI bus addresses for whitelisting:
328 .. code-block:: console
331 for intf in eth2 eth3 eth4 eth5;
333 (cd "/sys/class/net/${intf}/device/" && pwd -P);
336 sed -n 's,.*/\(.*\),-w \1,p'
340 .. code-block:: console
347 #. Request huge pages:
349 .. code-block:: console
351 echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages/nr_hugepages
353 #. Start testpmd with basic parameters:
355 .. code-block:: console
357 testpmd -c 0xff00 -n 4 -w 05:00.0 -w 05:00.1 -w 06:00.0 -w 06:00.1 -- --rxq=2 --txq=2 -i
361 .. code-block:: console
364 EAL: PCI device 0000:05:00.0 on NUMA socket 0
365 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
366 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_0" (VF: false)
367 PMD: librte_pmd_mlx5: 1 port(s) detected
368 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fe
369 EAL: PCI device 0000:05:00.1 on NUMA socket 0
370 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
371 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_1" (VF: false)
372 PMD: librte_pmd_mlx5: 1 port(s) detected
373 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:ff
374 EAL: PCI device 0000:06:00.0 on NUMA socket 0
375 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
376 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_2" (VF: false)
377 PMD: librte_pmd_mlx5: 1 port(s) detected
378 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fa
379 EAL: PCI device 0000:06:00.1 on NUMA socket 0
380 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
381 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_3" (VF: false)
382 PMD: librte_pmd_mlx5: 1 port(s) detected
383 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fb
384 Interactive-mode selected
385 Configuring Port 0 (socket 0)
386 PMD: librte_pmd_mlx5: 0x8cba80: TX queues number update: 0 -> 2
387 PMD: librte_pmd_mlx5: 0x8cba80: RX queues number update: 0 -> 2
388 Port 0: E4:1D:2D:E7:0C:FE
389 Configuring Port 1 (socket 0)
390 PMD: librte_pmd_mlx5: 0x8ccac8: TX queues number update: 0 -> 2
391 PMD: librte_pmd_mlx5: 0x8ccac8: RX queues number update: 0 -> 2
392 Port 1: E4:1D:2D:E7:0C:FF
393 Configuring Port 2 (socket 0)
394 PMD: librte_pmd_mlx5: 0x8cdb10: TX queues number update: 0 -> 2
395 PMD: librte_pmd_mlx5: 0x8cdb10: RX queues number update: 0 -> 2
396 Port 2: E4:1D:2D:E7:0C:FA
397 Configuring Port 3 (socket 0)
398 PMD: librte_pmd_mlx5: 0x8ceb58: TX queues number update: 0 -> 2
399 PMD: librte_pmd_mlx5: 0x8ceb58: RX queues number update: 0 -> 2
400 Port 3: E4:1D:2D:E7:0C:FB
401 Checking link statuses...
402 Port 0 Link Up - speed 40000 Mbps - full-duplex
403 Port 1 Link Up - speed 40000 Mbps - full-duplex
404 Port 2 Link Up - speed 10000 Mbps - full-duplex
405 Port 3 Link Up - speed 10000 Mbps - full-duplex