X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Fmlx5.rst;h=afa65a1379a51ac81923d002ca0c2fc57304eda2;hb=95fcf7bff48eedcf645bcbfe7d9d9e0eabfd2784;hp=4b6d8fb4d55be915a1d38434b4277f626f8fa0a6;hpb=b7ff093e8c3b181cdbe7e86ed4e9fd3dca2094a1;p=dpdk.git diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst index 4b6d8fb4d5..afa65a1379 100644 --- a/doc/guides/nics/mlx5.rst +++ b/doc/guides/nics/mlx5.rst @@ -20,11 +20,6 @@ Information and documentation about these adapters can be found on the There is also a `section dedicated to this poll mode driver `__. -.. note:: - - Due to external dependencies, this driver is disabled in default configuration - of the "make" build. It can be enabled with ``CONFIG_RTE_LIBRTE_MLX5_PMD=y`` - or by using "meson" build system which will detect dependencies. Design ------ @@ -241,6 +236,32 @@ Limitations reduce the requested Tx size or adjust data inline settings with ``txq_inline_max`` and ``txq_inline_mpw`` devargs keys. +- To provide the packet send scheduling on mbuf timestamps the ``tx_pp`` + parameter should be specified, RTE_MBUF_DYNFIELD_TIMESTAMP_NAME and + RTE_MBUF_DYNFLAG_TIMESTAMP_NAME should be registered by application. + When PMD sees the RTE_MBUF_DYNFLAG_TIMESTAMP_NAME set on the packet + being sent it tries to synchronize the time of packet appearing on + the wire with the specified packet timestamp. It the specified one + is in the past it should be ignored, if one is in the distant future + it should be capped with some reasonable value (in range of seconds). + These specific cases ("too late" and "distant future") can be optionally + reported via device xstats to assist applications to detect the + time-related problems. + + The timestamp upper "too-distant-future" limit + at the moment of invoking the Tx burst routine + can be estimated as ``tx_pp`` option (in nanoseconds) multiplied by 2^23. + Please note, for the testpmd txonly mode, + the limit is deduced from the expression:: + + (n_tx_descriptors / burst_size + 1) * inter_burst_gap + + There is no any packet reordering according timestamps is supposed, + neither within packet burst, nor between packets, it is an entirely + application responsibility to generate packets and its timestamps + in desired order. The timestamps can be put only in the first packet + in the burst providing the entire burst scheduling. + - E-Switch decapsulation Flow: - can be applied to PF port only. @@ -262,7 +283,7 @@ Limitations - The input buffer, providing the removal size, is not validated. - The buffer size must match the length of the headers to be removed. -- ICMP/ICMP6 code/type matching, IP-in-IP and MPLS flow matching are all +- ICMP(code/type/identifier/sequence number) / ICMP6(code/type) matching, IP-in-IP and MPLS flow matching are all mutually exclusive features which cannot be supported together (see :ref:`mlx5_firmware_config`). @@ -279,6 +300,18 @@ Limitations Other TCP packets (e.g. with MPLS label) received on Rx queue with LRO enabled, will be received with bad checksum. +- CRC: + + - ``DEV_RX_OFFLOAD_KEEP_CRC`` cannot be supported with decapsulation + for some NICs (such as ConnectX-6 Dx and BlueField 2). + The capability bit ``scatter_fcs_w_decap_disable`` shows NIC support. + +- Sample flow: + + - Supports ``RTE_FLOW_ACTION_TYPE_SAMPLE`` action only within NIC Rx and E-Switch steering domain. + - The E-Switch Sample flow must have the eswitch_manager VPORT destination (PF or ECPF) and no additional actions. + - For ConnectX-5, the ``RTE_FLOW_ACTION_TYPE_SAMPLE`` is typically used as first action in the E-Switch egress flow if with header modify or encapsulation actions. + Statistics ---------- @@ -296,53 +329,19 @@ Configuration Compilation options ~~~~~~~~~~~~~~~~~~~ -These options can be modified in the ``.config`` file. - -- ``CONFIG_RTE_LIBRTE_MLX5_PMD`` (default **n**) - - Toggle compilation of librte_pmd_mlx5 itself. - -- ``CONFIG_RTE_IBVERBS_LINK_DLOPEN`` (default **n**) +The ibverbs libraries can be linked with this PMD in a number of ways, +configured by the ``ibverbs_link`` build option: - Build PMD with additional code to make it loadable without hard - dependencies on **libibverbs** nor **libmlx5**, which may not be installed - on the target system. +- ``shared`` (default): the PMD depends on some .so files. - 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)``. +- ``dlopen``: Split the dependencies glue in a separate library + loaded when needed by dlopen. + It make dependencies on libibverbs and libmlx4 optional, + and has no performance impact. - It works by moving these dependencies to a purpose-built rdma-core "glue" - plug-in which must either be installed in a directory whose name is based - on ``CONFIG_RTE_EAL_PMD_PATH`` suffixed with ``-glue`` 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_IBVERBS_LINK_STATIC`` (default **n**) - - Embed static flavor of the dependencies **libibverbs** and **libmlx5** +- ``static``: Embed static flavor of the dependencies libibverbs and libmlx4 in the PMD shared library or the executable static binary. -- ``CONFIG_RTE_LIBRTE_MLX5_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. - -.. note:: - - For BlueField, target should be set to ``arm64-bluefield-linux-gcc``. This - will enable ``CONFIG_RTE_LIBRTE_MLX5_PMD`` and set ``RTE_CACHE_LINE_SIZE`` to - 64. Default armv8a configuration of make build and meson build set it to 128 - then brings performance degradation. - -This option is available in meson: - -- ``ibverbs_link`` can be ``static``, ``shared``, or ``dlopen``. - Environment variables ~~~~~~~~~~~~~~~~~~~~~ @@ -351,10 +350,6 @@ Environment variables 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_IBVERBS_LINK_DLOPEN`` - enabled and most useful when ``CONFIG_RTE_EAL_PMD_PATH`` is also set, - since ``LD_LIBRARY_PATH`` has no effect in this case. - - ``MLX5_SHUT_UP_BF`` Configures HW Tx doorbell register as IO-mapped. @@ -700,6 +695,25 @@ Driver options variable "MLX5_SHUT_UP_BF" value is used. If there is no "MLX5_SHUT_UP_BF", the default ``tx_db_nc`` value is zero for ARM64 hosts and one for others. +- ``tx_pp`` parameter [int] + + If a nonzero value is specified the driver creates all necessary internal + objects to provide accurate packet send scheduling on mbuf timestamps. + The positive value specifies the scheduling granularity in nanoseconds, + the packet send will be accurate up to specified digits. The allowed range is + from 500 to 1 million of nanoseconds. The negative value specifies the module + of granularity and engages the special test mode the check the schedule rate. + By default (if the ``tx_pp`` is not specified) send scheduling on timestamps + feature is disabled. + +- ``tx_skew`` parameter [int] + + The parameter adjusts the send packet scheduling on timestamps and represents + the average delay between beginning of the transmitting descriptor processing + by the hardware and appearance of actual packet data on the wire. The value + should be provided in nanoseconds and is valid only if ``tx_pp`` parameter is + specified. The default value is zero. + - ``tx_vec_en`` parameter [int] A nonzero value enables Tx vector on ConnectX-5, ConnectX-6, ConnectX-6 Dx @@ -879,6 +893,22 @@ Driver options By default, the PMD will set this value to 0. +- ``sys_mem_en`` parameter [int] + + A non-zero value enables the PMD memory management allocating memory + from system by default, without explicit rte memory flag. + + By default, the PMD will set this value to 0. + +- ``decap_en`` parameter [int] + + Some devices do not support FCS (frame checksum) scattering for + tunnel-decapsulated packets. + If set to 0, this option forces the FCS feature and rejects tunnel + decapsulation in the flow engine for such devices. + + By default, the PMD will set this value to 1. + .. _mlx5_firmware_config: Firmware configuration @@ -942,7 +972,7 @@ Below are some firmware configurations listed. FLEX_PARSER_PROFILE_ENABLE=1 -- enable ICMP/ICMP6 code/type fields matching:: +- enable ICMP(code/type/identifier/sequence number) / ICMP6(code/type) fields matching:: FLEX_PARSER_PROFILE_ENABLE=2 @@ -956,6 +986,11 @@ Below are some firmware configurations listed. FLEX_PARSER_PROFILE_ENABLE=3 +- enable eCPRI flow matching:: + + FLEX_PARSER_PROFILE_ENABLE=4 + PROG_PARSE_GRAPH=1 + Prerequisites ------------- @@ -1037,12 +1072,6 @@ RDMA Core with Linux Kernel .. _`Linux installation documentation`: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/plain/Documentation/admin-guide/README.rst .. _`RDMA Core installation documentation`: https://raw.githubusercontent.com/linux-rdma/rdma-core/master/README.md -If rdma-core libraries are built but not installed, DPDK makefile can link them, -thanks to these environment variables: - - - ``EXTRA_CFLAGS=-I/path/to/rdma-core/build/include`` - - ``EXTRA_LDFLAGS=-L/path/to/rdma-core/build/lib`` - - ``PKG_CONFIG_PATH=/path/to/rdma-core/build/lib/pkgconfig`` Mellanox OFED/EN ^^^^^^^^^^^^^^^^ @@ -1175,8 +1204,8 @@ Quick Start Guide on OFED/EN echo [num_vfs] > /sys/class/infiniband/mlx5_0/device/sriov_numvfs -6. Compile DPDK and you are ready to go. See instructions on - :ref:`Development Kit Build System ` +6. Install DPDK and you are ready to go. + See :doc:`compilation instructions <../linux_gsg/build_dpdk>`. Enable switchdev mode --------------------- @@ -1380,6 +1409,11 @@ Supported hardware offloads | | | rdma-core 26 | | rdma-core 26 | | | | ConnectX-5 | | ConnectX-5 | +-----------------------+-----------------+-----------------+ + | Sampling | | DPDK 20.11 | | DPDK 20.11 | + | | | OFED 5.2 | | OFED 5.2 | + | | | rdma-core 32 | | rdma-core 32 | + | | | ConnectX-5 | | ConnectX-5 | + +-----------------------+-----------------+-----------------+ Notes for metadata ------------------