X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Fmlx4.rst;h=cab45dfe84b355813bde03886f5335fa17a472c4;hb=c3f15def2ebe9cc255cf0e5cf32aa171f5b4326d;hp=49f4626376b332309775be971d6c476d0ad820ec;hpb=97f17497d162afdb82c8704bf097f0fee3724b2e;p=deb_dpdk.git diff --git a/doc/guides/nics/mlx4.rst b/doc/guides/nics/mlx4.rst index 49f46263..cab45dfe 100644 --- a/doc/guides/nics/mlx4.rst +++ b/doc/guides/nics/mlx4.rst @@ -1,5 +1,6 @@ .. BSD LICENSE - Copyright 2012-2015 6WIND S.A. + 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 @@ -73,31 +74,6 @@ long as they share the same MAC address. Compiling librte_pmd_mlx4 causes DPDK to be linked against libibverbs. -Features --------- - -- RSS, also known as RCA, is supported. In this mode the number of - configured RX queues must be a power of two. -- VLAN filtering is supported. -- Link state information is provided. -- Promiscuous mode is supported. -- All multicast mode is supported. -- Multiple MAC addresses (unicast, multicast) can be configured. -- Scattered packets are supported for TX and RX. -- Inner L3/L4 (IP, TCP and UDP) TX/RX checksum offloading and validation. -- Outer L3 (IP) TX/RX checksum offloading and validation for VXLAN frames. -- Secondary process TX is supported. - -Limitations ------------ - -- RSS hash key cannot be modified. -- RSS RETA cannot be configured -- RSS always includes L3 (IPv4/IPv6) and L4 (UDP/TCP). They cannot be - dissociated. -- Hardware counters are not implemented (they are software counters). -- Secondary process RX is not supported. - Configuration ------------- @@ -116,18 +92,6 @@ 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_SGE_WR_N`` (default **4**) - - Number of scatter/gather elements (SGEs) per work request (WR). Lowering - this number improves performance but also limits the ability to receive - scattered packets (packets that do not fit a single mbuf). The default - value is a safe tradeoff. - -- ``CONFIG_RTE_LIBRTE_MLX4_MAX_INLINE`` (default **0**) - - Amount of data to be inlined during TX operations. Improves latency but - lowers throughput. - - ``CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE`` (default **8**) Maximum number of cached memory pools (MPs) per TX queue. Each MP from @@ -136,32 +100,21 @@ These options can be modified in the ``.config`` file. This value is always 1 for RX queues since they use a single MP. -- ``CONFIG_RTE_LIBRTE_MLX4_SOFT_COUNTERS`` (default **1**) - - Toggle software counters. No counters are available if this option is - disabled since hardware counters are not supported. - -Environment variables -~~~~~~~~~~~~~~~~~~~~~ - -- ``MLX4_INLINE_RECV_SIZE`` - - A nonzero value enables inline receive for packets up to that size. May - significantly improve performance in some cases but lower it in - others. Requires careful testing. - Run-time configuration ~~~~~~~~~~~~~~~~~~~~~~ -- The only constraint when RSS mode is requested is to make sure the number - of RX queues is a power of two. This is a hardware requirement. - - 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 ~~~~~~~~~~~~~~~~~~~~~~~~ @@ -192,7 +145,7 @@ 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** +- **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 @@ -202,7 +155,7 @@ DPDK and must be installed separately: resources allocations) to be managed by the kernel and fast operations to never leave user space. -- **libmlx4** +- **libmlx4** (provided by rdma-core package) Low-level user space driver library for Mellanox ConnectX-3 devices, it is automatically loaded by libibverbs. @@ -210,7 +163,7 @@ DPDK and must be installed separately: This library basically implements send/receive calls to the hardware queues. -- **Kernel modules** (mlnx-ofed-kernel) +- **Kernel modules** They provide the kernel-side verbs API and low level device drivers that manage actual hardware initialization and resources sharing with user @@ -236,25 +189,27 @@ DPDK and must be installed separately: Both libraries are BSD and GPL licensed. Linux kernel modules are GPL licensed. -Currently supported by DPDK: +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`_). -- Mellanox OFED **3.1**. -- Firmware version **2.35.5100** and higher. -- Supported architectures: **x86_64** and **POWER8**. +.. _`RDMA core installation documentation`: https://raw.githubusercontent.com/linux-rdma/rdma-core/master/README.md -Getting Mellanox OFED -~~~~~~~~~~~~~~~~~~~~~ +.. _Mellanox_OFED_as_a_fallback: -While these libraries and kernel modules are available on OpenFabrics -Alliance's `website `_ and provided by package -managers on most distributions, this PMD requires Ethernet extensions that -may not be supported at the moment (this is a work in progress). +Mellanox OFED as a fallback +~~~~~~~~~~~~~~~~~~~~~~~~~~~ -`Mellanox OFED -`_ -includes the necessary support and should be used in the meantime. For DPDK, -only libibverbs, libmlx4, mlnx-ofed-kernel packages and firmware updates are -required from that distribution. +- `Mellanox OFED`_ version: **4.2**. +- firmware version: **2.42.5000** and above. + +.. _`Mellanox OFED`: http://www.mellanox.com/page/products_dyn?product_family=26&mtag=linux_sw_drivers .. note:: @@ -262,6 +217,155 @@ required from that distribution. 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 `. + +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= + 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 ` + +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 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 68.w + + If the output is different than 3XXX, set it by: + + .. code-block:: console + + setpci -s 68.w=3XXX + + The XXX can be different on different systems. Make sure to configure + according to the setpci output. + Usage example ------------- @@ -338,7 +442,7 @@ devices managed by librte_pmd_mlx4. .. code-block:: console - testpmd -c 0xff00 -n 4 -w 0000:83:00.0 -w 0000:84:00.0 -- --rxq=2 --txq=2 -i + testpmd -l 8-15 -n 4 -w 0000:83:00.0 -w 0000:84:00.0 -- --rxq=2 --txq=2 -i Example output: