Documentation: igb: Prepare documentation for RST conversion

Before making the conversion to the RST (reStructured Text) format, there
are changes needed to the documentation so that there are no build errors.

Also fixed old/broken URLs to the correct or updated URL.
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

Documentation/networking/igb.txt

+.. SPDX-License-Identifier: GPL-2.0+
+
 Linux* Base Driver for Intel(R) Ethernet Network Connection
 ===========================================================
 
 Intel Gigabit Linux driver.
-Copyright(c) 1999 - 2013 Intel Corporation.
+Copyright(c) 1999-2018 Intel Corporation.
 
 Contents
 ========
 
 - Identifying Your Adapter
+- Command Line Parameters
 - Additional Configurations
 - Support
 
+
 Identifying Your Adapter
 ========================
+For information on how to identify your adapter, and for the latest Intel
+network drivers, refer to the Intel Support website:
+http://www.intel.com/support
 
-This driver supports all 82575, 82576 and 82580-based Intel (R) gigabit network
-connections.
 
-For specific information on how to identify your adapter, go to the Adapter &
-Driver ID Guide at:
+Command Line Parameters
+========================
+If the driver is built as a module, the following optional parameters are used
+by entering them on the command line with the modprobe command using this
+syntax::
 
-    http://support.intel.com/support/go/network/adapter/idguide.htm
+    modprobe igb [<option>=<VAL1>,<VAL2>,...]
 
-Command Line Parameters
-=======================
+There needs to be a <VAL#> for each network port in the system supported by
+this driver. The values will be applied to each instance, in function order.
+For example::
+
+    modprobe igb max_vfs=2,4
+
+In this case, there are two network ports supported by igb in the system.
 
-The default value for each parameter is generally the recommended setting,
-unless otherwise noted.
+NOTE: A descriptor describes a data buffer and attributes related to the data
+buffer. This information is accessed by the hardware.
 
 max_vfs
 -------
-Valid Range:   0-7
-Default Value: 0
+:Valid Range: 0-7
 
-This parameter adds support for SR-IOV.  It causes the driver to spawn up to
-max_vfs worth of virtual function.
+This parameter adds support for SR-IOV. It causes the driver to spawn up to
+max_vfs worth of virtual functions.  If the value is greater than 0 it will
+also force the VMDq parameter to be 1 or more.
 
-Additional Configurations
-=========================
+The parameters for the driver are referenced by position. Thus, if you have a
+dual port adapter, or more than one adapter in your system, and want N virtual
+functions per port, you must specify a number for each port with each parameter
+separated by a comma. For example::
 
-  Jumbo Frames
-  ------------
-  Jumbo Frames support is enabled by changing the MTU to a value larger than
-  the default of 1500.  Use the ip command to increase the MTU size.
-  For example:
+    modprobe igb max_vfs=4
 
-       ip link set dev eth<x> mtu 9000
+This will spawn 4 VFs on the first port.
 
-  This setting is not saved across reboots.
+::
 
-  Notes:
+    modprobe igb max_vfs=2,4
 
-  - The maximum MTU setting for Jumbo Frames is 9216.  This value coincides
-    with the maximum Jumbo Frames size of 9234 bytes.
+This will spawn 2 VFs on the first port and 4 VFs on the second port.
 
-  - Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
-    poor performance or loss of link.
+NOTE: Caution must be used in loading the driver with these parameters.
+Depending on your system configuration, number of slots, etc., it is impossible
+to predict in all cases where the positions would be on the command line.
 
-  ethtool
-  -------
-  The driver utilizes the ethtool interface for driver configuration and
-  diagnostics, as well as displaying statistical information. The latest
-  version of ethtool can be found at:
+NOTE: Neither the device nor the driver control how VFs are mapped into config
+space. Bus layout will vary by operating system. On operating systems that
+support it, you can check sysfs to find the mapping.
 
-  https://www.kernel.org/pub/software/network/ethtool/
+NOTE: When either SR-IOV mode or VMDq mode is enabled, hardware VLAN filtering
+and VLAN tag stripping/insertion will remain enabled. Please remove the old
+VLAN filter before the new VLAN filter is added. For example::
 
-  Enabling Wake on LAN* (WoL)
-  ---------------------------
-  WoL is configured through the ethtool* utility.
+    ip link set eth0 vf 0 vlan 100	// set vlan 100 for VF 0
+    ip link set eth0 vf 0 vlan 0	// Delete vlan 100
+    ip link set eth0 vf 0 vlan 200	// set a new vlan 200 for VF 0
 
-  For instructions on enabling WoL with ethtool, refer to the ethtool man page.
+Debug
+-----
+:Valid Range: 0-16 (0=none,...,16=all)
+:Default Value: 0
 
-  WoL will be enabled on the system during the next shut down or reboot.
-  For this driver version, in order to enable WoL, the igb driver must be
-  loaded when shutting down or rebooting the system.
+This parameter adjusts the level debug messages displayed in the system logs.
 
-  Wake On LAN is only supported on port A of multi-port adapters.
 
-  Wake On LAN is not supported for the Intel(R) Gigabit VT Quad Port Server
-  Adapter.
+Additional Features and Configurations
+======================================
 
-  Multiqueue
-  ----------
-  In this mode, a separate MSI-X vector is allocated for each queue and one
-  for "other" interrupts such as link status change and errors.  All
-  interrupts are throttled via interrupt moderation.  Interrupt moderation
-  must be used to avoid interrupt storms while the driver is processing one
-  interrupt.  The moderation value should be at least as large as the expected
-  time for the driver to process an interrupt. Multiqueue is off by default.
+Jumbo Frames
+------------
+Jumbo Frames support is enabled by changing the Maximum Transmission Unit (MTU)
+to a value larger than the default value of 1500.
 
-  REQUIREMENTS: MSI-X support is required for Multiqueue. If MSI-X is not
-  found, the system will fallback to MSI or to Legacy interrupts.
+Use the ifconfig command to increase the MTU size. For example, enter the
+following where <x> is the interface number::
 
-  MAC and VLAN anti-spoofing feature
-  ----------------------------------
-  When a malicious driver attempts to send a spoofed packet, it is dropped by
-  the hardware and not transmitted.  An interrupt is sent to the PF driver
-  notifying it of the spoof attempt.
+    ifconfig eth<x> mtu 9000 up
 
-  When a spoofed packet is detected the PF driver will send the following
-  message to the system log (displayed by  the "dmesg" command):
+Alternatively, you can use the ip command as follows::
 
-  Spoof event(s) detected on VF(n)
+    ip link set mtu 9000 dev eth<x>
+    ip link set up dev eth<x>
+
+This setting is not saved across reboots. The setting change can be made
+permanent by adding 'MTU=9000' to the file:
+
+- For RHEL: /etc/sysconfig/network-scripts/ifcfg-eth<x>
+- For SLES: /etc/sysconfig/network/<config_file>
+
+NOTE: The maximum MTU setting for Jumbo Frames is 9216. This value coincides
+with the maximum Jumbo Frames size of 9234 bytes.
+
+NOTE: Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
+poor performance or loss of link.
+
+
+ethtool
+-------
+The driver utilizes the ethtool interface for driver configuration and
+diagnostics, as well as displaying statistical information. The latest ethtool
+version is required for this functionality. Download it at:
 
-  Where n=the VF that attempted to do the spoofing.
+https://www.kernel.org/pub/software/network/ethtool/
 
-  Setting MAC Address, VLAN and Rate Limit Using IProute2 Tool
-  ------------------------------------------------------------
-  You can set a MAC address of a Virtual Function (VF), a default VLAN and the
-  rate limit using the IProute2 tool. Download the latest version of the
-  iproute2 tool from Sourceforge if your version does not have all the
-  features you require.
+
+Enabling Wake on LAN* (WoL)
+---------------------------
+WoL is configured through the ethtool* utility.
+
+WoL will be enabled on the system during the next shut down or reboot. For
+this driver version, in order to enable WoL, the igb driver must be loaded
+prior to shutting down or suspending the system.
+
+NOTE: Wake on LAN is only supported on port A of multi-port devices.  Also
+Wake On LAN is not supported for the following device:
+- Intel(R) Gigabit VT Quad Port Server Adapter
+
+
+Multiqueue
+----------
+In this mode, a separate MSI-X vector is allocated for each queue and one for
+"other" interrupts such as link status change and errors. All interrupts are
+throttled via interrupt moderation. Interrupt moderation must be used to avoid
+interrupt storms while the driver is processing one interrupt. The moderation
+value should be at least as large as the expected time for the driver to
+process an interrupt. Multiqueue is off by default.
+
+REQUIREMENTS: MSI-X support is required for Multiqueue. If MSI-X is not found,
+the system will fallback to MSI or to Legacy interrupts. This driver supports
+receive multiqueue on all kernels that support MSI-X.
+
+NOTE: On some kernels a reboot is required to switch between single queue mode
+and multiqueue mode or vice-versa.
+
+
+MAC and VLAN anti-spoofing feature
+----------------------------------
+When a malicious driver attempts to send a spoofed packet, it is dropped by the
+hardware and not transmitted.
+
+An interrupt is sent to the PF driver notifying it of the spoof attempt. When a
+spoofed packet is detected, the PF driver will send the following message to
+the system log (displayed by the "dmesg" command):
+Spoof event(s) detected on VF(n), where n = the VF that attempted to do the
+spoofing
+
+
+Setting MAC Address, VLAN and Rate Limit Using IProute2 Tool
+------------------------------------------------------------
+You can set a MAC address of a Virtual Function (VF), a default VLAN and the
+rate limit using the IProute2 tool. Download the latest version of the
+IProute2 tool from Sourceforge if your version does not have all the features
+you require.
 
 
 Support
 =======
-
 For general information, go to the Intel support website at:
 
-    www.intel.com/support/
+https://www.intel.com/support/
 
 or the Intel Wired Networking project hosted by Sourceforge at:
 
-    http://sourceforge.net/projects/e1000
+https://sourceforge.net/projects/e1000
 
-If an issue is identified with the released source code on the supported
-kernel with a supported adapter, email the specific information related
-to the issue to e1000-devel@lists.sf.net
+If an issue is identified with the released source code on a supported kernel
+with a supported adapter, email the specific information related to the issue
+to e1000-devel@lists.sf.net.