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1.. SPDX-License-Identifier: GPL-2.0+2 3=============================================================4Linux Base Driver for Intel(R) Ethernet Multi-host Controller5=============================================================6 7August 20, 20188Copyright(c) 2015-2018 Intel Corporation.9 10Contents11========12- Identifying Your Adapter13- Additional Configurations14- Performance Tuning15- Known Issues16- Support17 18Identifying Your Adapter19========================20The driver in this release is compatible with devices based on the Intel(R)21Ethernet Multi-host Controller.22 23For information on how to identify your adapter, and for the latest Intel24network drivers, refer to the Intel Support website:25https://www.intel.com/support26 27 28Flow Control29------------30The Intel(R) Ethernet Switch Host Interface Driver does not support Flow31Control. It will not send pause frames. This may result in dropped frames.32 33 34Virtual Functions (VFs)35-----------------------36Use sysfs to enable VFs.37Valid Range: 0-6438 39For example::40 41 echo $num_vf_enabled > /sys/class/net/$dev/device/sriov_numvfs //enable VFs42 echo 0 > /sys/class/net/$dev/device/sriov_numvfs //disable VFs43 44NOTE: Neither the device nor the driver control how VFs are mapped into config45space. Bus layout will vary by operating system. On operating systems that46support it, you can check sysfs to find the mapping.47 48NOTE: When SR-IOV mode is enabled, hardware VLAN filtering and VLAN tag49stripping/insertion will remain enabled. Please remove the old VLAN filter50before the new VLAN filter is added. For example::51 52 ip link set eth0 vf 0 vlan 100 // set vlan 100 for VF 053 ip link set eth0 vf 0 vlan 0 // Delete vlan 10054 ip link set eth0 vf 0 vlan 200 // set a new vlan 200 for VF 055 56 57Additional Features and Configurations58======================================59 60Jumbo Frames61------------62Jumbo Frames support is enabled by changing the Maximum Transmission Unit (MTU)63to a value larger than the default value of 1500.64 65Use the ifconfig command to increase the MTU size. For example, enter the66following where <x> is the interface number::67 68 ifconfig eth<x> mtu 9000 up69 70Alternatively, you can use the ip command as follows::71 72 ip link set mtu 9000 dev eth<x>73 ip link set up dev eth<x>74 75This setting is not saved across reboots. The setting change can be made76permanent by adding 'MTU=9000' to the file:77 78- For RHEL: /etc/sysconfig/network-scripts/ifcfg-eth<x>79- For SLES: /etc/sysconfig/network/<config_file>80 81NOTE: The maximum MTU setting for Jumbo Frames is 15342. This value coincides82with the maximum Jumbo Frames size of 15364 bytes.83 84NOTE: This driver will attempt to use multiple page sized buffers to receive85each jumbo packet. This should help to avoid buffer starvation issues when86allocating receive packets.87 88 89Generic Receive Offload, aka GRO90--------------------------------91The driver supports the in-kernel software implementation of GRO. GRO has92shown that by coalescing Rx traffic into larger chunks of data, CPU93utilization can be significantly reduced when under large Rx load. GRO is an94evolution of the previously-used LRO interface. GRO is able to coalesce95other protocols besides TCP. It's also safe to use with configurations that96are problematic for LRO, namely bridging and iSCSI.97 98 99 100Supported ethtool Commands and Options for Filtering101----------------------------------------------------102-n --show-nfc103 Retrieves the receive network flow classification configurations.104 105rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6106 Retrieves the hash options for the specified network traffic type.107 108-N --config-nfc109 Configures the receive network flow classification.110 111rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r112 Configures the hash options for the specified network traffic type.113 114- udp4: UDP over IPv4115- udp6: UDP over IPv6116- f Hash on bytes 0 and 1 of the Layer 4 header of the rx packet.117- n Hash on bytes 2 and 3 of the Layer 4 header of the rx packet.118 119 120Known Issues/Troubleshooting121============================122 123Enabling SR-IOV in a 64-bit Microsoft Windows Server 2012/R2 guest OS under Linux KVM124-------------------------------------------------------------------------------------125KVM Hypervisor/VMM supports direct assignment of a PCIe device to a VM. This126includes traditional PCIe devices, as well as SR-IOV-capable devices based on127the Intel Ethernet Controller XL710.128 129 130Support131=======132For general information, go to the Intel support website at:133https://www.intel.com/support/134 135If an issue is identified with the released source code on a supported kernel136with a supported adapter, email the specific information related to the issue137to intel-wired-lan@lists.osuosl.org.138