1 Linux Base Driver for the Intel(R) Ethernet Controller XL710 Family
2 ===================================================================
4 Intel i40e Linux driver.
5 Copyright(c) 2013 Intel Corporation.
10 - Identifying Your Adapter
11 - Additional Configurations
17 Identifying Your Adapter
18 ========================
20 The driver in this release is compatible with the Intel Ethernet
21 Controller XL710 Family.
23 For more information on how to identify your adapter, go to the Adapter &
26 http://support.intel.com/support/network/sb/CS-012904.htm
32 The driver is enabled via the standard kernel configuration system,
33 using the make command:
35 Make oldconfig/silentoldconfig/menuconfig/etc.
37 The driver is located in the menu structure at:
40 -> Network device support (NETDEVICES [=y])
41 -> Ethernet driver support
43 -> Intel(R) Ethernet Controller XL710 Family
45 Additional Configurations
46 =========================
48 Generic Receive Offload (GRO)
49 -----------------------------
50 The driver supports the in-kernel software implementation of GRO. GRO has
51 shown that by coalescing Rx traffic into larger chunks of data, CPU
52 utilization can be significantly reduced when under large Rx load. GRO is
53 an evolution of the previously-used LRO interface. GRO is able to coalesce
54 other protocols besides TCP. It's also safe to use with configurations that
55 are problematic for LRO, namely bridging and iSCSI.
59 The driver utilizes the ethtool interface for driver configuration and
60 diagnostics, as well as displaying statistical information. The latest
61 ethtool version is required for this functionality.
63 The latest release of ethtool can be found from
64 https://www.kernel.org/pub/software/network/ethtool
67 Flow Director n-ntuple traffic filters (FDir)
68 ---------------------------------------------
69 The driver utilizes the ethtool interface for configuring ntuple filters,
70 via "ethtool -N <device> <filter>".
72 The sctp4, ip4, udp4, and tcp4 flow types are supported with the standard
73 fields including src-ip, dst-ip, src-port and dst-port. The driver only
74 supports fully enabling or fully masking the fields, so use of the mask
75 fields for partial matches is not supported.
77 Additionally, the driver supports using the action to specify filters for a
78 Virtual Function. You can specify the action as a 64bit value, where the
79 lower 32 bits represents the queue number, while the next 8 bits represent
80 which VF. Note that 0 is the PF, so the VF identifier is offset by 1. For
83 ... action 0x800000002 ...
85 Would indicate to direct traffic for Virtual Function 7 (8 minus 1) on queue
88 The driver also supports using the user-defined field to specify 2 bytes of
89 arbitrary data to match within the packet payload in addition to the regular
90 fields. The data is specified in the lower 32bits of the user-def field in
93 +----------------------------+---------------------------+
94 | 31 28 24 20 16 | 15 12 8 4 0|
95 +----------------------------+---------------------------+
96 | offset into packet payload | 2 bytes of flexible data |
97 +----------------------------+---------------------------+
101 ... user-def 0x4FFFF ....
103 means to match the value 0xFFFF 4 bytes into the packet payload. Note that
104 the offset is based on the beginning of the payload, and not the beginning
107 flow-type tcp4 ... user-def 0x8BEAF ....
109 would match TCP/IPv4 packets which have the value 0xBEAF 8bytes into the
112 For ICMP, the hardware parses the ICMP header as 4 bytes of header and 4
113 bytes of payload, so if you want to match an ICMP frames payload you may need
114 to add 4 to the offset in order to match the data.
116 Furthermore, the offset can only be up to a value of 64, as the hardware
117 will only read up to 64 bytes of data from the payload. It must also be even
118 as the flexible data is 2 bytes long and must be aligned to byte 0 of the
121 When programming filters, the hardware is limited to using a single input
122 set for each flow type. This means that it is an error to program two
123 different filters with the same type that don't match on the same fields.
124 Thus the second of the following two commands will fail:
126 ethtool -N <device> flow-type tcp4 src-ip 192.168.0.7 action 5
127 ethtool -N <device> flow-type tcp4 dst-ip 192.168.15.18 action 1
129 This is because the first filter will be accepted and reprogram the input
130 set for TCPv4 filters, but the second filter will be unable to reprogram the
131 input set until all the conflicting TCPv4 filters are first removed.
133 Note that the user-defined flexible offset is also considered part of the
134 input set and cannot be programmed separately for multiple filters of the
135 same type. However, the flexible data is not part of the input set and
136 multiple filters may use the same offset but match against different data.
138 Data Center Bridging (DCB)
139 --------------------------
140 DCB configuration is not currently supported.
144 The driver supports Fiber Channel over Ethernet (FCoE) and Data Center
145 Bridging (DCB) functionality. Configuring DCB and FCoE is outside the scope
146 of this driver doc. Refer to http://www.open-fcoe.org/ for FCoE project
147 information and http://www.open-lldp.org/ or email list
148 e1000-eedc@lists.sourceforge.net for DCB information.
150 MAC and VLAN anti-spoofing feature
151 ----------------------------------
152 When a malicious driver attempts to send a spoofed packet, it is dropped by
153 the hardware and not transmitted. An interrupt is sent to the PF driver
154 notifying it of the spoof attempt.
156 When a spoofed packet is detected the PF driver will send the following
157 message to the system log (displayed by the "dmesg" command):
159 Spoof event(s) detected on VF (n)
161 Where n=the VF that attempted to do the spoofing.
167 An excellent article on performance tuning can be found at:
169 http://www.redhat.com/promo/summit/2008/downloads/pdf/Thursday/Mark_Wagner.pdf
179 For general information, go to the Intel support website at:
181 http://support.intel.com
183 or the Intel Wired Networking project hosted by Sourceforge at:
185 http://e1000.sourceforge.net
187 If an issue is identified with the released source code on the supported
188 kernel with a supported adapter, email the specific information related
189 to the issue to e1000-devel@lists.sourceforge.net and copy
190 netdev@vger.kernel.org.