Documentation/networking/igb.txt

   1 Linux* Base Driver for Intel(R) Ethernet Network Connection
   2 ===========================================================
   3
   4 Intel Gigabit Linux driver.
   5 Copyright(c) 1999 - 2013 Intel Corporation.
   6
   7 Contents
   8 ========
   9
  10 - Identifying Your Adapter
  11 - Additional Configurations
  12 - Support
  13
  14 Identifying Your Adapter
  15 ========================
  16
  17 This driver supports all 82575, 82576 and 82580-based Intel (R) gigabit network
  18 connections.
  19
  20 For specific information on how to identify your adapter, go to the Adapter &
  21 Driver ID Guide at:
  22
  23     http://support.intel.com/support/go/network/adapter/idguide.htm
  24
  25 Command Line Parameters
  26 =======================
  27
  28 The default value for each parameter is generally the recommended setting,
  29 unless otherwise noted.
  30
  31 max_vfs
  32 -------
  33 Valid Range:   0-7
  34 Default Value: 0
  35
  36 This parameter adds support for SR-IOV.  It causes the driver to spawn up to
  37 max_vfs worth of virtual function.
  38
  39 QueuePairs
  40 ----------
  41 Valid Range:  0-1
  42 Default Value:  1 (TX and RX will be paired onto one interrupt vector)
  43
  44 If set to 0, when MSI-X is enabled, the TX and RX will attempt to occupy
  45 separate vectors.
  46
  47 This option can be overridden to 1 if there are not sufficient interrupts
  48 available.  This can occur if any combination of RSS, VMDQ, and max_vfs
  49 results in more than 4 queues being used.
  50
  51 Node
  52 ----
  53 Valid Range:   0-n
  54 Default Value: -1 (off)
  55
  56   0 - n: where n is the number of the NUMA node that should be used to
  57          allocate memory for this adapter port.
  58   -1: uses the driver default of allocating memory on whichever processor is
  59       running insmod/modprobe.
  60
  61   The Node parameter will allow you to pick which NUMA node you want to have
  62   the adapter allocate memory from.  All driver structures, in-memory queues,
  63   and receive buffers will be allocated on the node specified.  This parameter
  64   is only useful when interrupt affinity is specified, otherwise some portion
  65   of the time the interrupt could run on a different core than the memory is
  66   allocated on, causing slower memory access and impacting throughput, CPU, or
  67   both.
  68
  69 EEE
  70 ---
  71 Valid Range:  0-1
  72 Default Value: 1 (enabled)
  73
  74   A link between two EEE-compliant devices will result in periodic bursts of
  75   data followed by long periods where in the link is in an idle state. This Low
  76   Power Idle (LPI) state is supported in both 1Gbps and 100Mbps link speeds.
  77   NOTE: EEE support requires autonegotiation.
  78
  79 DMAC
  80 ----
  81 Valid Range: 0-1
  82 Default Value: 1 (enabled)
  83   Enables or disables DMA Coalescing feature.
  84
  85
  86
  87 Additional Configurations
  88 =========================
  89
  90   Jumbo Frames
  91   ------------
  92   Jumbo Frames support is enabled by changing the MTU to a value larger than
  93   the default of 1500.  Use the ifconfig command to increase the MTU size.
  94   For example:
  95
  96        ifconfig eth<x> mtu 9000 up
  97
  98   This setting is not saved across reboots.
  99
 100   Notes:
 101
 102   - The maximum MTU setting for Jumbo Frames is 9216.  This value coincides
 103     with the maximum Jumbo Frames size of 9234 bytes.
 104
 105   - Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
 106     poor performance or loss of link.
 107
 108   ethtool
 109   -------
 110   The driver utilizes the ethtool interface for driver configuration and
 111   diagnostics, as well as displaying statistical information. The latest
 112   version of ethtool can be found at:
 113
 114   http://ftp.kernel.org/pub/software/network/ethtool/
 115
 116   Enabling Wake on LAN* (WoL)
 117   ---------------------------
 118   WoL is configured through the ethtool* utility.
 119
 120   For instructions on enabling WoL with ethtool, refer to the ethtool man page.
 121
 122   WoL will be enabled on the system during the next shut down or reboot.
 123   For this driver version, in order to enable WoL, the igb driver must be
 124   loaded when shutting down or rebooting the system.
 125
 126   Wake On LAN is only supported on port A of multi-port adapters.
 127
 128   Wake On LAN is not supported for the Intel(R) Gigabit VT Quad Port Server
 129   Adapter.
 130
 131   Multiqueue
 132   ----------
 133   In this mode, a separate MSI-X vector is allocated for each queue and one
 134   for "other" interrupts such as link status change and errors.  All
 135   interrupts are throttled via interrupt moderation.  Interrupt moderation
 136   must be used to avoid interrupt storms while the driver is processing one
 137   interrupt.  The moderation value should be at least as large as the expected
 138   time for the driver to process an interrupt. Multiqueue is off by default.
 139
 140   REQUIREMENTS: MSI-X support is required for Multiqueue. If MSI-X is not
 141   found, the system will fallback to MSI or to Legacy interrupts.
 142
 143   MAC and VLAN anti-spoofing feature
 144   ----------------------------------
 145   When a malicious driver attempts to send a spoofed packet, it is dropped by
 146   the hardware and not transmitted.  An interrupt is sent to the PF driver
 147   notifying it of the spoof attempt.
 148
 149   When a spoofed packet is detected the PF driver will send the following
 150   message to the system log (displayed by  the "dmesg" command):
 151
 152   Spoof event(s) detected on VF(n)
 153
 154   Where n=the VF that attempted to do the spoofing.
 155
 156   Setting MAC Address, VLAN and Rate Limit Using IProute2 Tool
 157   ------------------------------------------------------------
 158   You can set a MAC address of a Virtual Function (VF), a default VLAN and the
 159   rate limit using the IProute2 tool. Download the latest version of the
 160   iproute2 tool from Sourceforge if your version does not have all the
 161   features you require.
 162
 163
 164 Support
 165 =======
 166
 167 For general information, go to the Intel support website at:
 168
 169     www.intel.com/support/
 170
 171 or the Intel Wired Networking project hosted by Sourceforge at:
 172
 173     http://sourceforge.net/projects/e1000
 174
 175 If an issue is identified with the released source code on the supported
 176 kernel with a supported adapter, email the specific information related
 177 to the issue to e1000-devel@lists.sf.net