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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.
82 - RX CRC stripping configuration.
84 - Multicast promiscuous mode.
85 - Hardware checksum offloads.
86 - Flow director (RTE_FDIR_MODE_PERFECT and RTE_FDIR_MODE_PERFECT_MAC_VLAN).
87 - Secondary process TX is supported.
92 - KVM and VMware ESX SR-IOV modes are not supported yet.
93 - Inner RSS for VXLAN frames is not supported yet.
94 - Port statistics through software counters only.
95 - Hardware checksum offloads for VXLAN inner header are not supported yet.
96 - Secondary process RX is not supported.
104 These options can be modified in the ``.config`` file.
106 - ``CONFIG_RTE_LIBRTE_MLX5_PMD`` (default **n**)
108 Toggle compilation of librte_pmd_mlx5 itself.
110 - ``CONFIG_RTE_LIBRTE_MLX5_DEBUG`` (default **n**)
112 Toggle debugging code and stricter compilation flags. Enabling this option
113 adds additional run-time checks and debugging messages at the cost of
116 - ``CONFIG_RTE_LIBRTE_MLX5_SGE_WR_N`` (default **4**)
118 Number of scatter/gather elements (SGEs) per work request (WR). Lowering
119 this number improves performance but also limits the ability to receive
120 scattered packets (packets that do not fit a single mbuf). The default
121 value is a safe tradeoff.
123 - ``CONFIG_RTE_LIBRTE_MLX5_MAX_INLINE`` (default **0**)
125 Amount of data to be inlined during TX operations. Improves latency.
126 Can improve PPS performance when PCI backpressure is detected and may be
127 useful for scenarios involving heavy traffic on many queues.
129 Since the additional software logic necessary to handle this mode can
130 lower performance when there is no backpressure, it is not enabled by
133 - ``CONFIG_RTE_LIBRTE_MLX5_TX_MP_CACHE`` (default **8**)
135 Maximum number of cached memory pools (MPs) per TX queue. Each MP from
136 which buffers are to be transmitted must be associated to memory regions
137 (MRs). This is a slow operation that must be cached.
139 This value is always 1 for RX queues since they use a single MP.
141 Environment variables
142 ~~~~~~~~~~~~~~~~~~~~~
144 - ``MLX5_ENABLE_CQE_COMPRESSION``
146 A nonzero value lets ConnectX-4 return smaller completion entries to
147 improve performance when PCI backpressure is detected. It is most useful
148 for scenarios involving heavy traffic on many queues.
150 Since the additional software logic necessary to handle this mode can
151 lower performance when there is no backpressure, it is not enabled by
154 Run-time configuration
155 ~~~~~~~~~~~~~~~~~~~~~~
157 - librte_pmd_mlx5 brings kernel network interfaces up during initialization
158 because it is affected by their state. Forcing them down prevents packets
161 - **ethtool** operations on related kernel interfaces also affect the PMD.
166 This driver relies on external libraries and kernel drivers for resources
167 allocations and initialization. The following dependencies are not part of
168 DPDK and must be installed separately:
172 User space Verbs framework used by librte_pmd_mlx5. This library provides
173 a generic interface between the kernel and low-level user space drivers
176 It allows slow and privileged operations (context initialization, hardware
177 resources allocations) to be managed by the kernel and fast operations to
178 never leave user space.
182 Low-level user space driver library for Mellanox ConnectX-4 devices,
183 it is automatically loaded by libibverbs.
185 This library basically implements send/receive calls to the hardware
188 - **Kernel modules** (mlnx-ofed-kernel)
190 They provide the kernel-side Verbs API and low level device drivers that
191 manage actual hardware initialization and resources sharing with user
194 Unlike most other PMDs, these modules must remain loaded and bound to
197 - mlx5_core: hardware driver managing Mellanox ConnectX-4 devices and
198 related Ethernet kernel network devices.
199 - mlx5_ib: InifiniBand device driver.
200 - ib_uverbs: user space driver for Verbs (entry point for libibverbs).
202 - **Firmware update**
204 Mellanox OFED releases include firmware updates for ConnectX-4 adapters.
206 Because each release provides new features, these updates must be applied to
207 match the kernel modules and libraries they come with.
211 Both libraries are BSD and GPL licensed. Linux kernel modules are GPL
214 Currently supported by DPDK:
216 - Mellanox OFED **3.1-1.0.3**, **3.1-1.5.7.1** or **3.2-2.0.0.0** depending
219 The following features are supported with version **3.1-1.5.7.1** and
222 - IPv6, UPDv6, TCPv6 RSS.
223 - RX checksum offloads.
226 The following features are supported with version **3.2-2.0.0.0** and
231 - RX CRC stripping configuration.
233 - Minimum firmware version:
235 With MLNX_OFED **3.1-1.0.3**:
237 - ConnectX-4: **12.12.1240**
238 - ConnectX-4 Lx: **14.12.1100**
240 With MLNX_OFED **3.1-1.5.7.1**:
242 - ConnectX-4: **12.13.0144**
243 - ConnectX-4 Lx: **14.13.0144**
245 With MLNX_OFED **3.2-2.0.0.0**:
247 - ConnectX-4: **12.14.2036**
248 - ConnectX-4 Lx: **14.14.2036**
250 Getting Mellanox OFED
251 ~~~~~~~~~~~~~~~~~~~~~
253 While these libraries and kernel modules are available on OpenFabrics
254 Alliance's `website <https://www.openfabrics.org/>`__ and provided by package
255 managers on most distributions, this PMD requires Ethernet extensions that
256 may not be supported at the moment (this is a work in progress).
259 <http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux>`__
260 includes the necessary support and should be used in the meantime. For DPDK,
261 only libibverbs, libmlx5, mlnx-ofed-kernel packages and firmware updates are
262 required from that distribution.
266 Several versions of Mellanox OFED are available. Installing the version
267 this DPDK release was developed and tested against is strongly
268 recommended. Please check the `prerequisites`_.
273 Compared to librte_pmd_mlx4 that implements a single RSS configuration per
274 port, librte_pmd_mlx5 supports per-protocol RSS configuration.
276 Since ``testpmd`` defaults to IP RSS mode and there is currently no
277 command-line parameter to enable additional protocols (UDP and TCP as well
278 as IP), the following commands must be entered from its CLI to get the same
279 behavior as librte_pmd_mlx4:
281 .. code-block:: console
284 > port config all rss all
290 This section demonstrates how to launch **testpmd** with Mellanox ConnectX-4
291 devices managed by librte_pmd_mlx5.
293 #. Load the kernel modules:
295 .. code-block:: console
297 modprobe -a ib_uverbs mlx5_core mlx5_ib
299 Alternatively if MLNX_OFED is fully installed, the following script can
302 .. code-block:: console
304 /etc/init.d/openibd restart
308 User space I/O kernel modules (uio and igb_uio) are not used and do
309 not have to be loaded.
311 #. Make sure Ethernet interfaces are in working order and linked to kernel
312 verbs. Related sysfs entries should be present:
314 .. code-block:: console
316 ls -d /sys/class/net/*/device/infiniband_verbs/uverbs* | cut -d / -f 5
320 .. code-block:: console
327 #. Optionally, retrieve their PCI bus addresses for whitelisting:
329 .. code-block:: console
332 for intf in eth2 eth3 eth4 eth5;
334 (cd "/sys/class/net/${intf}/device/" && pwd -P);
337 sed -n 's,.*/\(.*\),-w \1,p'
341 .. code-block:: console
348 #. Request huge pages:
350 .. code-block:: console
352 echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages/nr_hugepages
354 #. Start testpmd with basic parameters:
356 .. code-block:: console
358 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
362 .. code-block:: console
365 EAL: PCI device 0000:05:00.0 on NUMA socket 0
366 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
367 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_0" (VF: false)
368 PMD: librte_pmd_mlx5: 1 port(s) detected
369 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fe
370 EAL: PCI device 0000:05:00.1 on NUMA socket 0
371 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
372 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_1" (VF: false)
373 PMD: librte_pmd_mlx5: 1 port(s) detected
374 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:ff
375 EAL: PCI device 0000:06:00.0 on NUMA socket 0
376 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
377 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_2" (VF: false)
378 PMD: librte_pmd_mlx5: 1 port(s) detected
379 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fa
380 EAL: PCI device 0000:06:00.1 on NUMA socket 0
381 EAL: probe driver: 15b3:1013 librte_pmd_mlx5
382 PMD: librte_pmd_mlx5: PCI information matches, using device "mlx5_3" (VF: false)
383 PMD: librte_pmd_mlx5: 1 port(s) detected
384 PMD: librte_pmd_mlx5: port 1 MAC address is e4:1d:2d:e7:0c:fb
385 Interactive-mode selected
386 Configuring Port 0 (socket 0)
387 PMD: librte_pmd_mlx5: 0x8cba80: TX queues number update: 0 -> 2
388 PMD: librte_pmd_mlx5: 0x8cba80: RX queues number update: 0 -> 2
389 Port 0: E4:1D:2D:E7:0C:FE
390 Configuring Port 1 (socket 0)
391 PMD: librte_pmd_mlx5: 0x8ccac8: TX queues number update: 0 -> 2
392 PMD: librte_pmd_mlx5: 0x8ccac8: RX queues number update: 0 -> 2
393 Port 1: E4:1D:2D:E7:0C:FF
394 Configuring Port 2 (socket 0)
395 PMD: librte_pmd_mlx5: 0x8cdb10: TX queues number update: 0 -> 2
396 PMD: librte_pmd_mlx5: 0x8cdb10: RX queues number update: 0 -> 2
397 Port 2: E4:1D:2D:E7:0C:FA
398 Configuring Port 3 (socket 0)
399 PMD: librte_pmd_mlx5: 0x8ceb58: TX queues number update: 0 -> 2
400 PMD: librte_pmd_mlx5: 0x8ceb58: RX queues number update: 0 -> 2
401 Port 3: E4:1D:2D:E7:0C:FB
402 Checking link statuses...
403 Port 0 Link Up - speed 40000 Mbps - full-duplex
404 Port 1 Link Up - speed 40000 Mbps - full-duplex
405 Port 2 Link Up - speed 10000 Mbps - full-duplex
406 Port 3 Link Up - speed 10000 Mbps - full-duplex