1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright 2019 Mellanox Technologies, Ltd
4 .. include:: <isonum.txt>
9 The mlx5 vDPA (vhost data path acceleration) driver library
10 (**librte_vdpa_mlx5**) provides support for **Mellanox ConnectX-6**,
11 **Mellanox ConnectX-6 Dx** and **Mellanox BlueField** families of
12 10/25/40/50/100/200 Gb/s adapters as well as their virtual functions (VF) in
17 This driver is enabled automatically when using "meson" build system which
18 will detect dependencies.
20 See :doc:`../../platform/mlx5` guide for design details,
21 and which PMDs can be combined with vDPA PMD.
26 * Mellanox\ |reg| ConnectX\ |reg|-6 200G MCX654106A-HCAT (2x200G)
27 * Mellanox\ |reg| ConnectX\ |reg|-6 Dx EN 25G MCX621102AN-ADAT (2x25G)
28 * Mellanox\ |reg| ConnectX\ |reg|-6 Dx EN 100G MCX623106AN-CDAT (2x100G)
29 * Mellanox\ |reg| ConnectX\ |reg|-6 Dx EN 200G MCX623105AN-VDAT (1x200G)
30 * Mellanox\ |reg| BlueField SmartNIC 25G MBF1M332A-ASCAT (2x25G)
35 - Mellanox OFED version: **5.0**
36 See :ref:`mlx5 common prerequisites <mlx5_linux_prerequisites>` for more details.
38 Run-time configuration
39 ~~~~~~~~~~~~~~~~~~~~~~
44 Please refer to :ref:`mlx5 common options <mlx5_common_driver_options>`
45 for an additional list of options shared with other mlx5 drivers.
47 - ``event_mode`` parameter [int]
49 - 0, Completion queue scheduling will be managed by a timer thread which
50 automatically adjusts its delays to the coming traffic rate.
52 - 1, Completion queue scheduling will be managed by a timer thread with fixed
55 - 2, Completion queue scheduling will be managed by interrupts. Each CQ burst
56 arms the CQ in order to get an interrupt event in the next traffic burst.
60 - ``event_us`` parameter [int]
62 Per mode micro-seconds parameter - relevant only for event mode 0 and 1:
64 - 0, A nonzero value to set timer step in micro-seconds. The timer thread
65 dynamic delay change steps according to this value. Default value is 1us.
67 - 1, A value to set fixed timer delay in micro-seconds. Default value is 0us.
69 - ``no_traffic_time`` parameter [int]
71 A nonzero value defines the traffic off time, in polling cycle time units,
72 that moves the driver to no-traffic mode. In this mode the polling is stopped
73 and interrupts are configured to the device in order to notify traffic for the
74 driver. Default value is 16.
76 - ``event_core`` parameter [int]
78 CPU core number to set polling thread affinity to, default to control plane
81 - ``hw_latency_mode`` parameter [int]
83 The completion queue moderation mode:
87 - 1, Latency is counted from the first packet completion report.
89 - 2, Latency is counted from the last packet completion.
91 - ``hw_max_latency_us`` parameter [int]
93 - 1 - 4095, The maximum time in microseconds that packet completion report
98 - ``hw_max_pending_comp`` parameter [int]
100 - 1 - 65535, The maximum number of pending packets completions in an HW queue.
108 Upon potential hardware errors, mlx5 PMD try to recover, give up if failed 3
109 times in 3 seconds, virtq will be put in disable state. User should check log
110 to get error information, or query vdpa statistics counter to know error type