1 .. SPDX-License-Identifier: GPL-2.0+
3 =============================================================
4 Linux Base Driver for Intel(R) Ethernet Multi-host Controller
5 =============================================================
8 Copyright(c) 2015-2018 Intel Corporation.
12 - Identifying Your Adapter
13 - Additional Configurations
18 Identifying Your Adapter
19 ========================
20 The driver in this release is compatible with devices based on the Intel(R)
21 Ethernet Multi-host Controller.
23 For information on how to identify your adapter, and for the latest Intel
24 network drivers, refer to the Intel Support website:
25 https://www.intel.com/support
30 The Intel(R) Ethernet Switch Host Interface Driver does not support Flow
31 Control. It will not send pause frames. This may result in dropped frames.
34 Virtual Functions (VFs)
35 -----------------------
36 Use sysfs to enable VFs.
41 echo $num_vf_enabled > /sys/class/net/$dev/device/sriov_numvfs //enable VFs
42 echo 0 > /sys/class/net/$dev/device/sriov_numvfs //disable VFs
44 NOTE: Neither the device nor the driver control how VFs are mapped into config
45 space. Bus layout will vary by operating system. On operating systems that
46 support it, you can check sysfs to find the mapping.
48 NOTE: When SR-IOV mode is enabled, hardware VLAN filtering and VLAN tag
49 stripping/insertion will remain enabled. Please remove the old VLAN filter
50 before the new VLAN filter is added. For example::
52 ip link set eth0 vf 0 vlan 100 // set vlan 100 for VF 0
53 ip link set eth0 vf 0 vlan 0 // Delete vlan 100
54 ip link set eth0 vf 0 vlan 200 // set a new vlan 200 for VF 0
57 Additional Features and Configurations
58 ======================================
62 Jumbo Frames support is enabled by changing the Maximum Transmission Unit (MTU)
63 to a value larger than the default value of 1500.
65 Use the ifconfig command to increase the MTU size. For example, enter the
66 following where <x> is the interface number::
68 ifconfig eth<x> mtu 9000 up
70 Alternatively, you can use the ip command as follows::
72 ip link set mtu 9000 dev eth<x>
73 ip link set up dev eth<x>
75 This setting is not saved across reboots. The setting change can be made
76 permanent by adding 'MTU=9000' to the file:
78 - For RHEL: /etc/sysconfig/network-scripts/ifcfg-eth<x>
79 - For SLES: /etc/sysconfig/network/<config_file>
81 NOTE: The maximum MTU setting for Jumbo Frames is 15342. This value coincides
82 with the maximum Jumbo Frames size of 15364 bytes.
84 NOTE: This driver will attempt to use multiple page sized buffers to receive
85 each jumbo packet. This should help to avoid buffer starvation issues when
86 allocating receive packets.
89 Generic Receive Offload, aka GRO
90 --------------------------------
91 The driver supports the in-kernel software implementation of GRO. GRO has
92 shown that by coalescing Rx traffic into larger chunks of data, CPU
93 utilization can be significantly reduced when under large Rx load. GRO is an
94 evolution of the previously-used LRO interface. GRO is able to coalesce
95 other protocols besides TCP. It's also safe to use with configurations that
96 are problematic for LRO, namely bridging and iSCSI.
100 Supported ethtool Commands and Options for Filtering
101 ----------------------------------------------------
103 Retrieves the receive network flow classification configurations.
105 rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
106 Retrieves the hash options for the specified network traffic type.
109 Configures the receive network flow classification.
111 rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r
112 Configures the hash options for the specified network traffic type.
114 - udp4: UDP over IPv4
115 - udp6: UDP over IPv6
116 - 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.
120 Known Issues/Troubleshooting
121 ============================
123 Enabling SR-IOV in a 64-bit Microsoft Windows Server 2012/R2 guest OS under Linux KVM
124 -------------------------------------------------------------------------------------
125 KVM Hypervisor/VMM supports direct assignment of a PCIe device to a VM. This
126 includes traditional PCIe devices, as well as SR-IOV-capable devices based on
127 the Intel Ethernet Controller XL710.
132 For general information, go to the Intel support website at:
134 https://www.intel.com/support/
136 or the Intel Wired Networking project hosted by Sourceforge at:
138 https://sourceforge.net/projects/e1000
140 If an issue is identified with the released source code on a supported kernel
141 with a supported adapter, email the specific information related to the issue
142 to e1000-devel@lists.sf.net.