X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Fenic.rst;h=91bdcd065a95a06e424aa5bf7d0e09e1f96a5153;hb=a86144cd9ded2db1b719c9464cff8091edff2474;hp=a28a7f4e477a201324c9ddb5b5c9f9098a0862dd;hpb=3d4b2afb73f7f0988f8e66ba1b37f2a446e33868;p=dpdk.git diff --git a/doc/guides/nics/enic.rst b/doc/guides/nics/enic.rst index a28a7f4e47..91bdcd065a 100644 --- a/doc/guides/nics/enic.rst +++ b/doc/guides/nics/enic.rst @@ -20,13 +20,6 @@ should be downloaded from https://core.dpdk.org/download/ Configuration information ------------------------- -- **DPDK Configuration Parameters** - - The following configuration options are available for the ENIC PMD: - - - **CONFIG_RTE_LIBRTE_ENIC_PMD** (default y): Enables or disables inclusion - of the ENIC PMD driver in the DPDK compilation. - - **vNIC Configuration Parameters** - **Number of Queues** @@ -187,7 +180,7 @@ or ``vfio`` in non-IOMMU mode. In the VM, the kernel enic driver may be automatically bound to the VF during boot. Unbinding it currently hangs due to a known issue with the driver. To -work around the issue, blacklist the enic module as follows. +work around the issue, block the enic module as follows. Please see :ref:`Limitations ` for limitations in the use of SR-IOV. @@ -301,35 +294,31 @@ inner and outer packets can be IPv4 or IPv6. RSS hash calculation, therefore queue selection, is done on inner packets. -In order to enable overlay offload, the 'Enable VXLAN' box should be checked +In order to enable overlay offload, enable VXLAN and/or Geneve on vNIC via CIMC or UCSM followed by a reboot of the server. When PMD successfully -enables overlay offload, it prints the following message on the console. +enables overlay offload, it prints one of the following messages on the console. .. code-block:: console - Overlay offload is enabled + Overlay offload is enabled (VxLAN) + Overlay offload is enabled (Geneve) + Overlay offload is enabled (VxLAN, Geneve) By default, PMD enables overlay offload if hardware supports it. To disable it, set ``devargs`` parameter ``disable-overlay=1``. For example:: - -w 12:00.0,disable-overlay=1 - -By default, the NIC uses 4789 as the VXLAN port. The user may change -it through ``rte_eth_dev_udp_tunnel_port_{add,delete}``. However, as -the current NIC has a single VXLAN port number, the user cannot -configure multiple port numbers. + -a 12:00.0,disable-overlay=1 -Geneve headers with non-zero options are not supported by default. To -use Geneve with options, update the VIC firmware to the latest version -and then set ``devargs`` parameter ``geneve-opt=1``. When Geneve with -options is enabled, flow API cannot be used as the features are -currently mutually exclusive. When this feature is successfully -enabled, PMD prints the following message. - -.. code-block:: console - - Geneve with options is enabled +By default, the NIC uses 4789 and 6081 as the VXLAN and Geneve ports, +respectively. The user may change them through +``rte_eth_dev_udp_tunnel_port_{add,delete}``. However, as the current +NIC has a single VXLAN port number and a single Geneve port number, +the user cannot configure multiple port numbers for each tunnel type. +Geneve offload support has evolved over VIC models. On older models, +Geneve offload and advanced filters are mutually exclusive. This is +enforced by UCSM and CIMC, which only allow one of the two features +to be selected at one time. Newer VIC models do not have this restriction. Ingress VLAN Rewrite -------------------- @@ -378,7 +367,7 @@ vectorized handler, take the following steps. PMD consider the vectorized handler when selecting the receive handler. For example:: - -w 12:00.0,enable-avx2-rx=1 + -a 12:00.0,enable-avx2-rx=1 As the current implementation is intended for field trials, by default, the vectorized handler is not considered (``enable-avx2-rx=0``). @@ -395,6 +384,31 @@ vectorized handler is selected, enable debug logging enic_use_vector_rx_handler use the non-scatter avx2 Rx handler +64B Completion Queue Entry +-------------------------- + +Recent VIC adapters support 64B completion queue entries, as well as +16B entries that are available on all adapter models. ENIC PMD enables +and uses 64B entries by default, if available. 64B entries generally +lower CPU cycles per Rx packet, as they avoid partial DMA writes and +reduce cache contention between DMA and polling CPU. The effect is +most pronounced when multiple Rx queues are used on Intel platforms +with Data Direct I/O Technology (DDIO). + +If 64B entries are not available, PMD uses 16B entries. The user may +explicitly disable 64B entries and use 16B entries by setting +``devarg`` parameter ``cq64=0``. For example:: + + -a 12:00.0,cq64=0 + +To verify the selected entry size, enable debug logging +(``--log-level=enic,debug``) and check the following messages. + +.. code-block:: console + + PMD: rte_enic_pmd: Supported CQ entry sizes: 16 32 + PMD: rte_enic_pmd: Using 16B CQ entry size + .. _enic_limitations: Limitations @@ -427,7 +441,7 @@ DPDK as untagged packets. In this case mbuf->vlan_tci and the PKT_RX_VLAN and PKT_RX_VLAN_STRIPPED mbuf flags would not be set. This mode is enabled with the ``devargs`` parameter ``ig-vlan-rewrite=untag``. For example:: - -w 12:00.0,ig-vlan-rewrite=untag + -a 12:00.0,ig-vlan-rewrite=untag - **SR-IOV** @@ -437,7 +451,7 @@ PKT_RX_VLAN_STRIPPED mbuf flags would not be set. This mode is enabled with the - VF devices are not usable directly from the host. They can only be used as assigned devices on VM instances. - Currently, unbind of the ENIC kernel mode driver 'enic.ko' on the VM - instance may hang. As a workaround, enic.ko should be blacklisted or removed + instance may hang. As a workaround, enic.ko should be blocked or removed from the boot process. - pci_generic cannot be used as the uio module in the VM. igb_uio or vfio in non-IOMMU mode can be used. @@ -583,11 +597,6 @@ The value depends on the memory configuration of the application, DPDK and PMD. Typically, the limit has to be raised to higher than 2GB. e.g., 2621440 -The compilation of any unused drivers can be disabled using the -configuration file in config/ directory (e.g., config/common_linux). -This would help in bringing down the time taken for building the -libraries and the initialization time of the application. - Additional Reference --------------------