[v2] Documentation: e1000e: Update kernel documentation

Message ID 20180412203600.18829-1-jeffrey.t.kirsher@intel.com
State Changes Requested
Delegated to: Jeff Kirsher
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  • [v2] Documentation: e1000e: Update kernel documentation
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Commit Message

Jeff Kirsher April 12, 2018, 8:36 p.m.
Updated the e1000e.txt kernel documentation with the latest information.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
v2: fixed up documentation based on community feedback and internal
    review

---
 Documentation/networking/e1000e.txt | 460 ++++++++++++++++++------------------
 1 file changed, 233 insertions(+), 227 deletions(-)

Comments

Brown, Aaron F April 25, 2018, 1:28 a.m. | #1
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On
> Behalf Of Jeff Kirsher
> Sent: Thursday, April 12, 2018 1:36 PM
> To: intel-wired-lan@lists.osuosl.org
> Subject: [Intel-wired-lan] [PATCH v2] Documentation: e1000e: Update kernel
> documentation
> 
> Updated the e1000e.txt kernel documentation with the latest information.
> 
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> ---
> v2: fixed up documentation based on community feedback and internal
>     review
> 
> ---
>  Documentation/networking/e1000e.txt | 460 ++++++++++++++++++--------
> ----------
>  1 file changed, 233 insertions(+), 227 deletions(-)
> 
> diff --git a/Documentation/networking/e1000e.txt
> b/Documentation/networking/e1000e.txt
> index 12089547baed..e9dd18e1d2c6 100644
> --- a/Documentation/networking/e1000e.txt
> +++ b/Documentation/networking/e1000e.txt
> @@ -2,7 +2,7 @@ Linux* Driver for Intel(R) Ethernet Network Connection
>  ======================================================
> 
>  Intel Gigabit Linux driver.
> -Copyright(c) 1999 - 2013 Intel Corporation.
> +Copyright(c) 1999-2018 Intel Corporation.
> 
>  Contents
>  ========
> @@ -13,300 +13,306 @@ Contents
>  - 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
> 
> -The e1000e driver supports all PCI Express Intel(R) Gigabit Network
> -Connections, except those that are 82575, 82576 and 82580-based*.
> -
> -* NOTE: The Intel(R) PRO/1000 P Dual Port Server Adapter is supported by
> -  the e1000 driver, not the e1000e driver due to the 82546 part being used
> -  behind a PCI Express bridge.
> -
> -For more information on how to identify your adapter, go to the Adapter &
> -Driver ID Guide at:
> -
> -    http://support.intel.com/support/go/network/adapter/idguide.htm
> -
> -For the latest Intel network drivers for Linux, refer to the following
> -website.  In the search field, enter your adapter name or type, or use the
> -networking link on the left to search for your adapter:
> -
> -    http://support.intel.com/support/go/network/adapter/home.htm
> 
>  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:
> +modprobe e1000e [<option>=<VAL1>,<VAL2>,...]
> +
> +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 e1000e InterruptThrottleRate=16000,16000
> +
> +In this case, there are two network ports supported by e1000e in the
> system.
>  The default value for each parameter is generally the recommended setting,
>  unless otherwise noted.
> 
> -NOTES:  For more information about the InterruptThrottleRate,
> -        RxIntDelay, TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay
> -        parameters, see the application note at:
> -        http://www.intel.com/design/network/applnots/ap450.htm
> +NOTE: For more information about the command line parameters, see the
> +application note at:
> http://www.intel.com/design/network/applnots/ap450.htm.
> +
> +NOTE: A descriptor describes a data buffer and attributes related to the
> data
> +buffer. This information is accessed by the hardware.
> +
> 
>  InterruptThrottleRate
>  ---------------------
> -Valid Range:   0,1,3,4,100-100000 (0=off, 1=dynamic, 3=dynamic
> conservative,
> -                                   4=simplified balancing)
> -Default Value: 3
> -
> -The driver can limit the amount of interrupts per second that the adapter
> -will generate for incoming packets. It does this by writing a value to the
> -adapter that is based on the maximum amount of interrupts that the
> adapter
> -will generate per second.
> -
> -Setting InterruptThrottleRate to a value greater or equal to 100
> -will program the adapter to send out a maximum of that many interrupts
> -per second, even if more packets have come in. This reduces interrupt
> -load on the system and can lower CPU utilization under heavy load,
> -but will increase latency as packets are not processed as quickly.
> -
> -The default behaviour of the driver previously assumed a static
> -InterruptThrottleRate value of 8000, providing a good fallback value for
> -all traffic types, but lacking in small packet performance and latency.
> -The hardware can handle many more small packets per second however,
> and
> -for this reason an adaptive interrupt moderation algorithm was
> implemented.
> -
> -The driver has two adaptive modes (setting 1 or 3) in which
> -it dynamically adjusts the InterruptThrottleRate value based on the traffic
> -that it receives. After determining the type of incoming traffic in the last
> -timeframe, it will adjust the InterruptThrottleRate to an appropriate value
> -for that traffic.
> -
> -The algorithm classifies the incoming traffic every interval into
> -classes.  Once the class is determined, the InterruptThrottleRate value is
> -adjusted to suit that traffic type the best. There are three classes defined:
> -"Bulk traffic", for large amounts of packets of normal size; "Low latency",
> -for small amounts of traffic and/or a significant percentage of small
> -packets; and "Lowest latency", for almost completely small packets or
> -minimal traffic.
> -
> -In dynamic conservative mode, the InterruptThrottleRate value is set to
> 4000
> -for traffic that falls in class "Bulk traffic". If traffic falls in the "Low
> -latency" or "Lowest latency" class, the InterruptThrottleRate is increased
> -stepwise to 20000. This default mode is suitable for most applications.
> -
> -For situations where low latency is vital such as cluster or
> -grid computing, the algorithm can reduce latency even more when
> -InterruptThrottleRate is set to mode 1. In this mode, which operates
> -the same as mode 3, the InterruptThrottleRate will be increased stepwise to
> -70000 for traffic in class "Lowest latency".
> -
> -In simplified mode the interrupt rate is based on the ratio of TX and
> -RX traffic.  If the bytes per second rate is approximately equal, the
> -interrupt rate will drop as low as 2000 interrupts per second.  If the
> -traffic is mostly transmit or mostly receive, the interrupt rate could
> -be as high as 8000.
> -
> -Setting InterruptThrottleRate to 0 turns off any interrupt moderation
> -and may improve small packet latency, but is generally not suitable
> -for bulk throughput traffic.
> -
> -NOTE:  InterruptThrottleRate takes precedence over the TxAbsIntDelay and
> -       RxAbsIntDelay parameters.  In other words, minimizing the receive
> -       and/or transmit absolute delays does not force the controller to
> -       generate more interrupts than what the Interrupt Throttle Rate
> -       allows.
> -
> -NOTE:  When e1000e is loaded with default settings and multiple adapters
> -       are in use simultaneously, the CPU utilization may increase non-
> -       linearly.  In order to limit the CPU utilization without impacting
> -       the overall throughput, we recommend that you load the driver as
> -       follows:
> -
> -           modprobe e1000e InterruptThrottleRate=3000,3000,3000
> -
> -       This sets the InterruptThrottleRate to 3000 interrupts/sec for
> -       the first, second, and third instances of the driver.  The range
> -       of 2000 to 3000 interrupts per second works on a majority of
> -       systems and is a good starting point, but the optimal value will
> -       be platform-specific.  If CPU utilization is not a concern, use
> -       RX_POLLING (NAPI) and default driver settings.
> +Valid Range:
> +0=off
> +1=dynamic
> +4=simplified balancing
> +<min_ITR>-<max_ITR>
> +Interrupt Throttle Rate controls the number of interrupts each interrupt
> +vector can generate per second. Increasing ITR lowers latency at the cost of
> +increased CPU utilization, though it may help throughput in some
> circumstances.
> +0 = Setting InterruptThrottleRate to 0 turns off any interrupt moderation
> +  and may improve small packet latency. However, this is generally not
> +  suitable for bulk throughput traffic due to the increased CPU utilization
> +  of the higher interrupt rate.
> +  NOTES:
> +  - On 82599, and X540, and X550-based adapters, disabling
> InterruptThrottleRate
> +    will also result in the driver disabling HW RSC.
> +  - On 82598-based adapters, disabling InterruptThrottleRate will also
> +    result in disabling LRO (Large Receive Offloads).

82598, 92599, X540 and X550 based adapters use the ixgbe driver and this detail in not relevant to the e1000e driver documentation.  There is no reason to include these "NOTES:" in this file.

> +1 = Setting InterruptThrottleRate to Dynamic mode attempts to moderate
> +  interrupts per vector while maintaining very low latency. This can
> +  sometimes cause extra CPU utilization. If planning on deploying e1000e
> +  in a latency sensitive environment, this parameter should be considered.
> +<min_ITR>-<max_ITR> =
> +  Setting InterruptThrottleRate to a value greater or equal to <min_ITR>
> +  will program the adapter to send at most that many interrupts
> +  per second, even if more packets have come in. This reduces interrupt
> load
> +  on the system and can lower CPU utilization under heavy load, but will
> +  increase latency as packets are not processed as quickly.
> +
> +NOTE:
> +- InterruptThrottleRate takes precedence over the TxAbsIntDelay and
> +  RxAbsIntDelay parameters. In other words, minimizing the receive and/or
> +  transmit absolute delays does not force the controller to generate more
> +  interrupts than what the Interrupt Throttle Rate allows.
> +
> 
>  RxIntDelay
>  ----------
> -Valid Range:   0-65535 (0=off)
> -Default Value: 0

Is there any real reason to remove this?  It seems inconsistent with most of our other driver documentation files that discuss parameters (e100.txt, e1000.txt, igb.txt, ixgb.txt.)  However, ixgbe.txt and i40e.txt do not seem to mention default for parameters defaults (well they barely mention module parameters) so maybe removing the statement of default makes sense for consistency with the later driver versions.

> -
> +Valid Range: 0-65535 (0=off)
>  This value delays the generation of receive interrupts in units of 1.024
> -microseconds.  Receive interrupt reduction can improve CPU efficiency if
> -properly tuned for specific network traffic.  Increasing this value adds
> -extra latency to frame reception and can end up decreasing the throughput
> -of TCP traffic.  If the system is reporting dropped receives, this value
> -may be set too high, causing the driver to run out of available receive
> -descriptors.
> -
> -CAUTION:  When setting RxIntDelay to a value other than 0, adapters may
> -          hang (stop transmitting) under certain network conditions.  If
> -          this occurs a NETDEV WATCHDOG message is logged in the system
> -          event log.  In addition, the controller is automatically reset,
> -          restoring the network connection.  To eliminate the potential
> -          for the hang ensure that RxIntDelay is set to 0.
> +microseconds. Receive interrupt reduction can improve CPU efficiency if
> +properly tuned for specific network traffic. Increasing this value adds extra
> +latency to frame reception and can end up decreasing the throughput of
> TCP
> +traffic. If the system is reporting dropped receives, this value may be set
> +too high, causing the driver to run out of available receive descriptors.
> +CAUTION: When setting RxIntDelay to a value other than 0, adapters may
> hang
> +(stop transmitting) under certain network conditions. If this occurs a
> NETDEV
> +WATCHDOG message is logged in the system event log. In addition, the
> +controller is automatically reset, restoring the network connection. To
> +eliminate the potential for the hang ensure that RxIntDelay is set to 0.
> 
>  RxAbsIntDelay
>  -------------
> -Valid Range:   0-65535 (0=off)
> -Default Value: 8

Again, is there any real reason to remove this?  Ok, I'll stop mentioning it when I hit this on each and every module parameter removal of the "Default Value:" description.  I suppose removing it saves me time on verifying the listed value is indeed correct. 

> -
> +Valid Range: 0-65535 (0=off)
>  This value, in units of 1.024 microseconds, limits the delay in which a
> -receive interrupt is generated.  Useful only if RxIntDelay is non-zero,
> -this value ensures that an interrupt is generated after the initial
> -packet is received within the set amount of time.  Proper tuning,
> -along with RxIntDelay, may improve traffic throughput in specific network
> -conditions.
> +receive interrupt is generated. This value ensures that an interrupt is
> +generated after the initial packet is received within the set amount of time,
> +which is useful only if RxIntDelay is non-zero. Proper tuning, along with
> +RxIntDelay, may improve traffic throughput in specific network conditions.
> +
> 
>  TxIntDelay
>  ----------
> -Valid Range:   0-65535 (0=off)
> -Default Value: 8
> +Valid Range: 0-65535 (0=off)
> +This value delays the generation of transmit interrupts in units of 1.024
> +microseconds. Transmit interrupt reduction can improve CPU efficiency if
> +properly tuned for specific network traffic. If the system is reporting
> +dropped transmits, this value may be set too high causing the driver to run
> +out of available transmit descriptors.
> 
> -This value delays the generation of transmit interrupts in units of
> -1.024 microseconds.  Transmit interrupt reduction can improve CPU
> -efficiency if properly tuned for specific network traffic.  If the
> -system is reporting dropped transmits, this value may be set too high
> -causing the driver to run out of available transmit descriptors.
> 
>  TxAbsIntDelay
>  -------------
> -Valid Range:   0-65535 (0=off)
> -Default Value: 32
> -
> +Valid Range: 0-65535 (0=off)
>  This value, in units of 1.024 microseconds, limits the delay in which a
> -transmit interrupt is generated.  Useful only if TxIntDelay is non-zero,
> -this value ensures that an interrupt is generated after the initial
> -packet is sent on the wire within the set amount of time.  Proper tuning,
> -along with TxIntDelay, may improve traffic throughput in specific
> -network conditions.
> +transmit interrupt is generated. It is useful only if TxIntDelay is non-zero.
> +It ensures that an interrupt is generated after the initial Packet is sent on
> +the wire within the set amount of time. Proper tuning, along with
> TxIntDelay,
> +may improve traffic throughput in specific network conditions.
> 
> -Copybreak
> ----------
> -Valid Range:   0-xxxxxxx (0=off)
> -Default Value: 256
> 
> -Driver copies all packets below or equaling this size to a fresh RX
> +copybreak
> +---------
> +Valid Range: 0-xxxxxxx (0=off)
> +The driver copies all packets below or equaling this size to a fresh receive
>  buffer before handing it up the stack.
> +This parameter differs from other parameters because it is a single (not
> 1,1,1
> +etc.) parameter applied to all driver instances and it is also available
> +during runtime at /sys/module/e1000e/parameters/copybreak.
> +
> +To use copybreak, type
> +
> +  modprobe e1000e.ko copybreak=128
> 
> -This parameter is different than other parameters, in that it is a
> -single (not 1,1,1 etc.) parameter applied to all driver instances and
> -it is also available during runtime at
> -/sys/module/e1000e/parameters/copybreak
> 
>  SmartPowerDownEnable
>  --------------------
>  Valid Range: 0-1
> -Default Value:  0 (disabled)
> +Allows Phy to turn off in lower power states. The user can turn off this
> +parameter in supported chipsets.
> 
> -Allows PHY to turn off in lower power states. The user can set this
> parameter
> -in supported chipsets.
> 
>  KumeranLockLoss
>  ---------------
>  Valid Range: 0-1
> -Default Value: 1 (enabled)
> +This workaround skips resetting the Phy at shutdown for the initial silicon
> +releases of ICH8 systems.
> 
> -This workaround skips resetting the PHY at shutdown for the initial
> -silicon releases of ICH8 systems.
> 
>  IntMode
>  -------
> -Valid Range: 0-2 (0=legacy, 1=MSI, 2=MSI-X)
> -Default Value: 2
> +Valid Range: 0-2 (0 = Legacy Int, 1 = MSI and 2 = MSI-X)
> +IntMode controls allow load time control over the type of interrupt
> +registered for by the driver. MSI-X is required for multiple queue
> +support, and some kernels and combinations of kernel .config options
> +will force a lower level of interrupt support.
> +'cat /proc/interrupts' will show different values for each type of interrupt.
> 
> -Allows changing the interrupt mode at module load time, without requiring
> a
> -recompile. If the driver load fails to enable a specific interrupt mode, the
> -driver will try other interrupt modes, from least to most compatible.  The
> -interrupt order is MSI-X, MSI, Legacy.  If specifying MSI (IntMode=1)
> -interrupts, only MSI and Legacy will be attempted.
> 
>  CrcStripping
>  ------------
>  Valid Range: 0-1
> -Default Value: 1 (enabled)
> -
> -Strip the CRC from received packets before sending up the network stack.  If
> +Strip the CRC from received packets before sending up the network stack. If
>  you have a machine with a BMC enabled but cannot receive IPMI traffic after
>  loading or enabling the driver, try disabling this feature.
> 
> +
>  WriteProtectNVM
>  ---------------
> +
>  Valid Range: 0,1
> -Default Value: 1
> 
>  If set to 1, configure the hardware to ignore all write/erase cycles to the
>  GbE region in the ICHx NVM (in order to prevent accidental corruption of the
>  NVM). This feature can be disabled by setting the parameter to 0 during
> initial
>  driver load.
> +
>  NOTE: The machine must be power cycled (full off/on) when enabling NVM
> writes
>  via setting the parameter to zero. Once the NVM has been locked (via the
>  parameter at 1 when the driver loads) it cannot be unlocked except via
> power
>  cycle.
> 
> -Additional Configurations
> -=========================
> -
> -  Jumbo Frames
> -  ------------
> -  Jumbo Frames support is enabled by changing the MTU to a value larger
> than
> -  the default of 1500.  Use the ifconfig command to increase the MTU size.
> -  For example:
> -
> -       ifconfig eth<x> mtu 9000 up
> -
> -  This setting is not saved across reboots.
> -
> -  Notes:
> -
> -  - The maximum MTU setting for Jumbo Frames is 9216.  This value coincides
> -    with the maximum Jumbo Frames size of 9234 bytes.
> -
> -  - Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
> -    poor performance or loss of link.
> -
> -  - Some adapters limit Jumbo Frames sized packets to a maximum of
> -    4096 bytes and some adapters do not support Jumbo Frames.
> -
> -  - Jumbo Frames cannot be configured on an 82579-based Network device,
> if
> -    MACSec is enabled on the system.
> -
> -  ethtool
> -  -------
> -  The driver utilizes the ethtool interface for driver configuration and
> -  diagnostics, as well as displaying statistical information.  We
> -  strongly recommend downloading the latest version of ethtool at:
> 
> -  https://kernel.org/pub/software/network/ethtool/
> +Additional Features and Configurations
> +-------------------------------------------
> 
> -  NOTE: When validating enable/disable tests on some parts (82578, for
> example)
> -  you need to add a few seconds between tests when working with ethtool.
> -
> -  Speed and Duplex
> -  ----------------
> -  Speed and Duplex are configured through the ethtool* utility. For
> -  instructions,  refer to the ethtool man page.
> -
> -  Enabling Wake on LAN* (WoL)
> -  ---------------------------
> -  WoL is configured through the ethtool* utility. For instructions on
> -  enabling WoL with ethtool, refer to the ethtool man page.
> -
> -  WoL will be enabled on the system during the next shut down or reboot.
> -  For this driver version, in order to enable WoL, the e1000e driver must be
> -  loaded when shutting down or rebooting the system.
> +Jumbo Frames
> +------------
> +Jumbo Frames support is enabled by changing the Maximum Transmission
> Unit (MTU)
> +to a value larger than the default value of 1500.
> +
> +Use the ifconfig command to increase the MTU size. For example, enter the
> +following where <x> is the interface number:
> +
> +   ifconfig eth<x> mtu 9000 up
> +Alternatively, you can use the ip command as follows:
> +   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:
> +/etc/sysconfig/network-scripts/ifcfg-eth<x> for RHEL or to the file
> +/etc/sysconfig/network/<config_file> for SLES.
> +
> +NOTE: The maximum MTU setting for Jumbo Frames is 8996. This value
> coincides
> +with the maximum Jumbo Frames size of 9018 bytes.
> +
> +NOTE: Using Jumbo frames at 10 or 100 Mbps is not supported and may
> result in
> +poor performance or loss of link.
> +
> +NOTE: The following adapters limit Jumbo Frames sized packets to a
> maximum of
> +4088 bytes:
> +  - Intel(R) 82578DM Gigabit Network Connection
> +  - Intel(R) 82577LM Gigabit Network Connection
> +- The following adapters do not support Jumbo Frames:
> +  - Intel(R) PRO/1000 Gigabit Server Adapter
> +  - Intel(R) PRO/1000 PM Network Connection
> +  - Intel(R) 82562G 10/100 Network Connection
> +  - Intel(R) 82562G-2 10/100 Network Connection
> +  - Intel(R) 82562GT 10/100 Network Connection
> +  - Intel(R) 82562GT-2 10/100 Network Connection
> +  - Intel(R) 82562V 10/100 Network Connection
> +  - Intel(R) 82562V-2 10/100 Network Connection
> +  - Intel(R) 82566DC Gigabit Network Connection
> +  - Intel(R) 82566DC-2 Gigabit Network Connection
> +  - Intel(R) 82566DM Gigabit Network Connection
> +  - Intel(R) 82566MC Gigabit Network Connection
> +  - Intel(R) 82566MM Gigabit Network Connection
> +  - Intel(R) 82567V-3 Gigabit Network Connection
> +  - Intel(R) 82577LC Gigabit Network Connection
> +  - Intel(R) 82578DC Gigabit Network Connection
> +- Jumbo Frames cannot be configured on an 82579-based Network device if
> +  MACSec is enabled on the system.
> +
> +
> +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:
> +http://ftp.kernel.org/pub/software/network/ethtool/

ftp.kernel.org does not resolve, use https://www.kernel.org/pub/software/network/ethtool, or just don't change it and use https://kernel.org/pub/software/network/ethtool/.

> +
> +NOTE: When validating enable/disable tests on some parts (for example,
> 82578),
> +it is necessary to add a few seconds between tests when working with
> ethtool.
> +
> +
> +Speed and Duplex Configuration
> +------------------------------
> +In addressing speed and duplex configuration issues, you need to
> distinguish
> +between copper-based adapters and fiber-based adapters.
> +
> +In the default mode, an Intel(R) Ethernet Network Adapter using copper
> +connections will attempt to auto-negotiate with its link partner to
> determine
> +the best setting. If the adapter cannot establish link with the link partner
> +using auto-negotiation, you may need to manually configure the adapter
> and link
> +partner to identical settings to establish link and pass packets. This should
> +only be needed when attempting to link with an older switch that does not
> +support auto-negotiation or one that has been forced to a specific speed or
> +duplex mode. Your link partner must match the setting you choose. 1 Gbps
> speeds
> +and higher cannot be forced. Use the autonegotiation advertising setting to
> +manually set devices for 1 Gbps and higher.
> +
> +Speed, duplex, and autonegotiation advertising are configured through the
> +ethtool* utility. ethtool is included with all versions of Red Hat after Red
> +Hat 7.2. For the latest version, download and install ethtool from the
> +following website:
> +
> +   http://ftp.kernel.org/pub/software/network/ethtool/
> +
> +Caution: Only experienced network administrators should force speed and
> duplex
> +or change autonegotiation advertising manually. The settings at the switch
> must
> +always match the adapter settings. Adapter performance may suffer or
> your
> +adapter may not operate if you configure the adapter differently from your
> +switch.
> +
> +An Intel(R) Ethernet Network Adapter using fiber-based connections,
> however,
> +will not attempt to auto-negotiate with its link partner since those adapters
> +operate only in full duplex and only at their native speed.
> +
> +
> +Enabling Wake on LAN* (WoL)
> +---------------------------
> +WoL is configured through the ethtool* utility. ethtool is included with all
> +versions of Red Hat after Red Hat 7.2. For other Linux distributions,
> download
> +and install ethtool from the following website:
> +http://ftp.kernel.org/pub/software/network/ethtool/.
> +
> +For instructions on enabling WoL with ethtool, refer to the website listed
> +above.
> +
> +WoL will be enabled on the system during the next shut down or reboot.
> For
> +this driver version, in order to enable WoL, the e1000e driver must be
> loaded
> +prior to shutting down or suspending the system.
> +
> +NOTE: Wake on LAN is only supported on port A for the following devices:
> +- Intel(R) PRO/1000 PT Dual Port Network Connection
> +- Intel(R) PRO/1000 PT Dual Port Server Connection
> +- Intel(R) PRO/1000 PT Dual Port Server Adapter
> +- Intel(R) PRO/1000 PF Dual Port Server Adapter
> +- Intel(R) PRO/1000 PT Quad Port Server Adapter
> +- Intel(R) Gigabit PT Quad Port Server ExpressModule
> 
> -  In most cases Wake On LAN is only supported on port A for multiple port
> -  adapters. To verify if a port supports Wake on Lan run ethtool eth<X>.
> 
>  Support
> -=======
> -
> +-------
>  For general information, go to the Intel support website at:
> -
> -    www.intel.com/support/
> +http://www.intel.com/support/
> 
>  or the Intel Wired Networking project hosted by Sourceforge at:
> -
> -    http://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
> +http://sourceforge.net/projects/e1000
> +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.
> --
> 2.14.3
> 
> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@osuosl.org
> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

Patch

diff --git a/Documentation/networking/e1000e.txt b/Documentation/networking/e1000e.txt
index 12089547baed..e9dd18e1d2c6 100644
--- a/Documentation/networking/e1000e.txt
+++ b/Documentation/networking/e1000e.txt
@@ -2,7 +2,7 @@  Linux* Driver for Intel(R) Ethernet Network Connection
 ======================================================
 
 Intel Gigabit Linux driver.
-Copyright(c) 1999 - 2013 Intel Corporation.
+Copyright(c) 1999-2018 Intel Corporation.
 
 Contents
 ========
@@ -13,300 +13,306 @@  Contents
 - 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
 
-The e1000e driver supports all PCI Express Intel(R) Gigabit Network
-Connections, except those that are 82575, 82576 and 82580-based*.
-
-* NOTE: The Intel(R) PRO/1000 P Dual Port Server Adapter is supported by
-  the e1000 driver, not the e1000e driver due to the 82546 part being used
-  behind a PCI Express bridge.
-
-For more information on how to identify your adapter, go to the Adapter &
-Driver ID Guide at:
-
-    http://support.intel.com/support/go/network/adapter/idguide.htm
-
-For the latest Intel network drivers for Linux, refer to the following
-website.  In the search field, enter your adapter name or type, or use the
-networking link on the left to search for your adapter:
-
-    http://support.intel.com/support/go/network/adapter/home.htm
 
 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:
+modprobe e1000e [<option>=<VAL1>,<VAL2>,...]
+
+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 e1000e InterruptThrottleRate=16000,16000
+
+In this case, there are two network ports supported by e1000e in the system.
 The default value for each parameter is generally the recommended setting,
 unless otherwise noted.
 
-NOTES:  For more information about the InterruptThrottleRate,
-        RxIntDelay, TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay
-        parameters, see the application note at:
-        http://www.intel.com/design/network/applnots/ap450.htm
+NOTE: For more information about the command line parameters, see the
+application note at: http://www.intel.com/design/network/applnots/ap450.htm.
+
+NOTE: A descriptor describes a data buffer and attributes related to the data
+buffer. This information is accessed by the hardware.
+
 
 InterruptThrottleRate
 ---------------------
-Valid Range:   0,1,3,4,100-100000 (0=off, 1=dynamic, 3=dynamic conservative,
-                                   4=simplified balancing)
-Default Value: 3
-
-The driver can limit the amount of interrupts per second that the adapter
-will generate for incoming packets. It does this by writing a value to the
-adapter that is based on the maximum amount of interrupts that the adapter
-will generate per second.
-
-Setting InterruptThrottleRate to a value greater or equal to 100
-will program the adapter to send out a maximum of that many interrupts
-per second, even if more packets have come in. This reduces interrupt
-load on the system and can lower CPU utilization under heavy load,
-but will increase latency as packets are not processed as quickly.
-
-The default behaviour of the driver previously assumed a static
-InterruptThrottleRate value of 8000, providing a good fallback value for
-all traffic types, but lacking in small packet performance and latency.
-The hardware can handle many more small packets per second however, and
-for this reason an adaptive interrupt moderation algorithm was implemented.
-
-The driver has two adaptive modes (setting 1 or 3) in which
-it dynamically adjusts the InterruptThrottleRate value based on the traffic
-that it receives. After determining the type of incoming traffic in the last
-timeframe, it will adjust the InterruptThrottleRate to an appropriate value
-for that traffic.
-
-The algorithm classifies the incoming traffic every interval into
-classes.  Once the class is determined, the InterruptThrottleRate value is
-adjusted to suit that traffic type the best. There are three classes defined:
-"Bulk traffic", for large amounts of packets of normal size; "Low latency",
-for small amounts of traffic and/or a significant percentage of small
-packets; and "Lowest latency", for almost completely small packets or
-minimal traffic.
-
-In dynamic conservative mode, the InterruptThrottleRate value is set to 4000
-for traffic that falls in class "Bulk traffic". If traffic falls in the "Low
-latency" or "Lowest latency" class, the InterruptThrottleRate is increased
-stepwise to 20000. This default mode is suitable for most applications.
-
-For situations where low latency is vital such as cluster or
-grid computing, the algorithm can reduce latency even more when
-InterruptThrottleRate is set to mode 1. In this mode, which operates
-the same as mode 3, the InterruptThrottleRate will be increased stepwise to
-70000 for traffic in class "Lowest latency".
-
-In simplified mode the interrupt rate is based on the ratio of TX and
-RX traffic.  If the bytes per second rate is approximately equal, the
-interrupt rate will drop as low as 2000 interrupts per second.  If the
-traffic is mostly transmit or mostly receive, the interrupt rate could
-be as high as 8000.
-
-Setting InterruptThrottleRate to 0 turns off any interrupt moderation
-and may improve small packet latency, but is generally not suitable
-for bulk throughput traffic.
-
-NOTE:  InterruptThrottleRate takes precedence over the TxAbsIntDelay and
-       RxAbsIntDelay parameters.  In other words, minimizing the receive
-       and/or transmit absolute delays does not force the controller to
-       generate more interrupts than what the Interrupt Throttle Rate
-       allows.
-
-NOTE:  When e1000e is loaded with default settings and multiple adapters
-       are in use simultaneously, the CPU utilization may increase non-
-       linearly.  In order to limit the CPU utilization without impacting
-       the overall throughput, we recommend that you load the driver as
-       follows:
-
-           modprobe e1000e InterruptThrottleRate=3000,3000,3000
-
-       This sets the InterruptThrottleRate to 3000 interrupts/sec for
-       the first, second, and third instances of the driver.  The range
-       of 2000 to 3000 interrupts per second works on a majority of
-       systems and is a good starting point, but the optimal value will
-       be platform-specific.  If CPU utilization is not a concern, use
-       RX_POLLING (NAPI) and default driver settings.
+Valid Range:
+0=off
+1=dynamic
+4=simplified balancing
+<min_ITR>-<max_ITR>
+Interrupt Throttle Rate controls the number of interrupts each interrupt
+vector can generate per second. Increasing ITR lowers latency at the cost of
+increased CPU utilization, though it may help throughput in some circumstances.
+0 = Setting InterruptThrottleRate to 0 turns off any interrupt moderation
+  and may improve small packet latency. However, this is generally not
+  suitable for bulk throughput traffic due to the increased CPU utilization
+  of the higher interrupt rate.
+  NOTES:
+  - On 82599, and X540, and X550-based adapters, disabling InterruptThrottleRate
+    will also result in the driver disabling HW RSC.
+  - On 82598-based adapters, disabling InterruptThrottleRate will also
+    result in disabling LRO (Large Receive Offloads).
+1 = Setting InterruptThrottleRate to Dynamic mode attempts to moderate
+  interrupts per vector while maintaining very low latency. This can
+  sometimes cause extra CPU utilization. If planning on deploying e1000e
+  in a latency sensitive environment, this parameter should be considered.
+<min_ITR>-<max_ITR> =
+  Setting InterruptThrottleRate to a value greater or equal to <min_ITR>
+  will program the adapter to send at most that many interrupts
+  per second, even if more packets have come in. This reduces interrupt load
+  on the system and can lower CPU utilization under heavy load, but will
+  increase latency as packets are not processed as quickly.
+
+NOTE:
+- InterruptThrottleRate takes precedence over the TxAbsIntDelay and
+  RxAbsIntDelay parameters. In other words, minimizing the receive and/or
+  transmit absolute delays does not force the controller to generate more
+  interrupts than what the Interrupt Throttle Rate allows.
+
 
 RxIntDelay
 ----------
-Valid Range:   0-65535 (0=off)
-Default Value: 0
-
+Valid Range: 0-65535 (0=off)
 This value delays the generation of receive interrupts in units of 1.024
-microseconds.  Receive interrupt reduction can improve CPU efficiency if
-properly tuned for specific network traffic.  Increasing this value adds
-extra latency to frame reception and can end up decreasing the throughput
-of TCP traffic.  If the system is reporting dropped receives, this value
-may be set too high, causing the driver to run out of available receive
-descriptors.
-
-CAUTION:  When setting RxIntDelay to a value other than 0, adapters may
-          hang (stop transmitting) under certain network conditions.  If
-          this occurs a NETDEV WATCHDOG message is logged in the system
-          event log.  In addition, the controller is automatically reset,
-          restoring the network connection.  To eliminate the potential
-          for the hang ensure that RxIntDelay is set to 0.
+microseconds. Receive interrupt reduction can improve CPU efficiency if
+properly tuned for specific network traffic. Increasing this value adds extra
+latency to frame reception and can end up decreasing the throughput of TCP
+traffic. If the system is reporting dropped receives, this value may be set
+too high, causing the driver to run out of available receive descriptors.
+CAUTION: When setting RxIntDelay to a value other than 0, adapters may hang
+(stop transmitting) under certain network conditions. If this occurs a NETDEV
+WATCHDOG message is logged in the system event log. In addition, the
+controller is automatically reset, restoring the network connection. To
+eliminate the potential for the hang ensure that RxIntDelay is set to 0.
 
 RxAbsIntDelay
 -------------
-Valid Range:   0-65535 (0=off)
-Default Value: 8
-
+Valid Range: 0-65535 (0=off)
 This value, in units of 1.024 microseconds, limits the delay in which a
-receive interrupt is generated.  Useful only if RxIntDelay is non-zero,
-this value ensures that an interrupt is generated after the initial
-packet is received within the set amount of time.  Proper tuning,
-along with RxIntDelay, may improve traffic throughput in specific network
-conditions.
+receive interrupt is generated. This value ensures that an interrupt is
+generated after the initial packet is received within the set amount of time,
+which is useful only if RxIntDelay is non-zero. Proper tuning, along with
+RxIntDelay, may improve traffic throughput in specific network conditions.
+
 
 TxIntDelay
 ----------
-Valid Range:   0-65535 (0=off)
-Default Value: 8
+Valid Range: 0-65535 (0=off)
+This value delays the generation of transmit interrupts in units of 1.024
+microseconds. Transmit interrupt reduction can improve CPU efficiency if
+properly tuned for specific network traffic. If the system is reporting
+dropped transmits, this value may be set too high causing the driver to run
+out of available transmit descriptors.
 
-This value delays the generation of transmit interrupts in units of
-1.024 microseconds.  Transmit interrupt reduction can improve CPU
-efficiency if properly tuned for specific network traffic.  If the
-system is reporting dropped transmits, this value may be set too high
-causing the driver to run out of available transmit descriptors.
 
 TxAbsIntDelay
 -------------
-Valid Range:   0-65535 (0=off)
-Default Value: 32
-
+Valid Range: 0-65535 (0=off)
 This value, in units of 1.024 microseconds, limits the delay in which a
-transmit interrupt is generated.  Useful only if TxIntDelay is non-zero,
-this value ensures that an interrupt is generated after the initial
-packet is sent on the wire within the set amount of time.  Proper tuning,
-along with TxIntDelay, may improve traffic throughput in specific
-network conditions.
+transmit interrupt is generated. It is useful only if TxIntDelay is non-zero.
+It ensures that an interrupt is generated after the initial Packet is sent on
+the wire within the set amount of time. Proper tuning, along with TxIntDelay,
+may improve traffic throughput in specific network conditions.
 
-Copybreak
----------
-Valid Range:   0-xxxxxxx (0=off)
-Default Value: 256
 
-Driver copies all packets below or equaling this size to a fresh RX
+copybreak
+---------
+Valid Range: 0-xxxxxxx (0=off)
+The driver copies all packets below or equaling this size to a fresh receive
 buffer before handing it up the stack.
+This parameter differs from other parameters because it is a single (not 1,1,1
+etc.) parameter applied to all driver instances and it is also available
+during runtime at /sys/module/e1000e/parameters/copybreak.
+
+To use copybreak, type
+
+  modprobe e1000e.ko copybreak=128
 
-This parameter is different than other parameters, in that it is a
-single (not 1,1,1 etc.) parameter applied to all driver instances and
-it is also available during runtime at
-/sys/module/e1000e/parameters/copybreak
 
 SmartPowerDownEnable
 --------------------
 Valid Range: 0-1
-Default Value:  0 (disabled)
+Allows Phy to turn off in lower power states. The user can turn off this
+parameter in supported chipsets.
 
-Allows PHY to turn off in lower power states. The user can set this parameter
-in supported chipsets.
 
 KumeranLockLoss
 ---------------
 Valid Range: 0-1
-Default Value: 1 (enabled)
+This workaround skips resetting the Phy at shutdown for the initial silicon
+releases of ICH8 systems.
 
-This workaround skips resetting the PHY at shutdown for the initial
-silicon releases of ICH8 systems.
 
 IntMode
 -------
-Valid Range: 0-2 (0=legacy, 1=MSI, 2=MSI-X)
-Default Value: 2
+Valid Range: 0-2 (0 = Legacy Int, 1 = MSI and 2 = MSI-X)
+IntMode controls allow load time control over the type of interrupt
+registered for by the driver. MSI-X is required for multiple queue
+support, and some kernels and combinations of kernel .config options
+will force a lower level of interrupt support.
+'cat /proc/interrupts' will show different values for each type of interrupt.
 
-Allows changing the interrupt mode at module load time, without requiring a
-recompile. If the driver load fails to enable a specific interrupt mode, the
-driver will try other interrupt modes, from least to most compatible.  The
-interrupt order is MSI-X, MSI, Legacy.  If specifying MSI (IntMode=1)
-interrupts, only MSI and Legacy will be attempted.
 
 CrcStripping
 ------------
 Valid Range: 0-1
-Default Value: 1 (enabled)
-
-Strip the CRC from received packets before sending up the network stack.  If
+Strip the CRC from received packets before sending up the network stack. If
 you have a machine with a BMC enabled but cannot receive IPMI traffic after
 loading or enabling the driver, try disabling this feature.
 
+
 WriteProtectNVM
 ---------------
+
 Valid Range: 0,1
-Default Value: 1
 
 If set to 1, configure the hardware to ignore all write/erase cycles to the
 GbE region in the ICHx NVM (in order to prevent accidental corruption of the
 NVM). This feature can be disabled by setting the parameter to 0 during initial
 driver load.
+
 NOTE: The machine must be power cycled (full off/on) when enabling NVM writes
 via setting the parameter to zero. Once the NVM has been locked (via the
 parameter at 1 when the driver loads) it cannot be unlocked except via power
 cycle.
 
-Additional Configurations
-=========================
-
-  Jumbo Frames
-  ------------
-  Jumbo Frames support is enabled by changing the MTU to a value larger than
-  the default of 1500.  Use the ifconfig command to increase the MTU size.
-  For example:
-
-       ifconfig eth<x> mtu 9000 up
-
-  This setting is not saved across reboots.
-
-  Notes:
-
-  - The maximum MTU setting for Jumbo Frames is 9216.  This value coincides
-    with the maximum Jumbo Frames size of 9234 bytes.
-
-  - Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
-    poor performance or loss of link.
-
-  - Some adapters limit Jumbo Frames sized packets to a maximum of
-    4096 bytes and some adapters do not support Jumbo Frames.
-
-  - Jumbo Frames cannot be configured on an 82579-based Network device, if
-    MACSec is enabled on the system.
-
-  ethtool
-  -------
-  The driver utilizes the ethtool interface for driver configuration and
-  diagnostics, as well as displaying statistical information.  We
-  strongly recommend downloading the latest version of ethtool at:
 
-  https://kernel.org/pub/software/network/ethtool/
+Additional Features and Configurations
+-------------------------------------------
 
-  NOTE: When validating enable/disable tests on some parts (82578, for example)
-  you need to add a few seconds between tests when working with ethtool.
-
-  Speed and Duplex
-  ----------------
-  Speed and Duplex are configured through the ethtool* utility. For
-  instructions,  refer to the ethtool man page.
-
-  Enabling Wake on LAN* (WoL)
-  ---------------------------
-  WoL is configured through the ethtool* utility. For instructions on
-  enabling WoL with ethtool, refer to the ethtool man page.
-
-  WoL will be enabled on the system during the next shut down or reboot.
-  For this driver version, in order to enable WoL, the e1000e driver must be
-  loaded when shutting down or rebooting the system.
+Jumbo Frames
+------------
+Jumbo Frames support is enabled by changing the Maximum Transmission Unit (MTU)
+to a value larger than the default value of 1500.
+
+Use the ifconfig command to increase the MTU size. For example, enter the
+following where <x> is the interface number:
+
+   ifconfig eth<x> mtu 9000 up
+Alternatively, you can use the ip command as follows:
+   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:
+/etc/sysconfig/network-scripts/ifcfg-eth<x> for RHEL or to the file
+/etc/sysconfig/network/<config_file> for SLES.
+
+NOTE: The maximum MTU setting for Jumbo Frames is 8996. This value coincides
+with the maximum Jumbo Frames size of 9018 bytes.
+
+NOTE: Using Jumbo frames at 10 or 100 Mbps is not supported and may result in
+poor performance or loss of link.
+
+NOTE: The following adapters limit Jumbo Frames sized packets to a maximum of
+4088 bytes:
+  - Intel(R) 82578DM Gigabit Network Connection
+  - Intel(R) 82577LM Gigabit Network Connection
+- The following adapters do not support Jumbo Frames:
+  - Intel(R) PRO/1000 Gigabit Server Adapter
+  - Intel(R) PRO/1000 PM Network Connection
+  - Intel(R) 82562G 10/100 Network Connection
+  - Intel(R) 82562G-2 10/100 Network Connection
+  - Intel(R) 82562GT 10/100 Network Connection
+  - Intel(R) 82562GT-2 10/100 Network Connection
+  - Intel(R) 82562V 10/100 Network Connection
+  - Intel(R) 82562V-2 10/100 Network Connection
+  - Intel(R) 82566DC Gigabit Network Connection
+  - Intel(R) 82566DC-2 Gigabit Network Connection
+  - Intel(R) 82566DM Gigabit Network Connection
+  - Intel(R) 82566MC Gigabit Network Connection
+  - Intel(R) 82566MM Gigabit Network Connection
+  - Intel(R) 82567V-3 Gigabit Network Connection
+  - Intel(R) 82577LC Gigabit Network Connection
+  - Intel(R) 82578DC Gigabit Network Connection
+- Jumbo Frames cannot be configured on an 82579-based Network device if
+  MACSec is enabled on the system.
+
+
+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:
+http://ftp.kernel.org/pub/software/network/ethtool/
+
+NOTE: When validating enable/disable tests on some parts (for example, 82578),
+it is necessary to add a few seconds between tests when working with ethtool.
+
+
+Speed and Duplex Configuration
+------------------------------
+In addressing speed and duplex configuration issues, you need to distinguish
+between copper-based adapters and fiber-based adapters.
+
+In the default mode, an Intel(R) Ethernet Network Adapter using copper
+connections will attempt to auto-negotiate with its link partner to determine
+the best setting. If the adapter cannot establish link with the link partner
+using auto-negotiation, you may need to manually configure the adapter and link
+partner to identical settings to establish link and pass packets. This should
+only be needed when attempting to link with an older switch that does not
+support auto-negotiation or one that has been forced to a specific speed or
+duplex mode. Your link partner must match the setting you choose. 1 Gbps speeds
+and higher cannot be forced. Use the autonegotiation advertising setting to
+manually set devices for 1 Gbps and higher.
+
+Speed, duplex, and autonegotiation advertising are configured through the
+ethtool* utility. ethtool is included with all versions of Red Hat after Red
+Hat 7.2. For the latest version, download and install ethtool from the
+following website:
+
+   http://ftp.kernel.org/pub/software/network/ethtool/
+
+Caution: Only experienced network administrators should force speed and duplex
+or change autonegotiation advertising manually. The settings at the switch must
+always match the adapter settings. Adapter performance may suffer or your
+adapter may not operate if you configure the adapter differently from your
+switch.
+
+An Intel(R) Ethernet Network Adapter using fiber-based connections, however,
+will not attempt to auto-negotiate with its link partner since those adapters
+operate only in full duplex and only at their native speed.
+
+
+Enabling Wake on LAN* (WoL)
+---------------------------
+WoL is configured through the ethtool* utility. ethtool is included with all
+versions of Red Hat after Red Hat 7.2. For other Linux distributions, download
+and install ethtool from the following website:
+http://ftp.kernel.org/pub/software/network/ethtool/.
+
+For instructions on enabling WoL with ethtool, refer to the website listed
+above.
+
+WoL will be enabled on the system during the next shut down or reboot. For
+this driver version, in order to enable WoL, the e1000e driver must be loaded
+prior to shutting down or suspending the system.
+
+NOTE: Wake on LAN is only supported on port A for the following devices:
+- Intel(R) PRO/1000 PT Dual Port Network Connection
+- Intel(R) PRO/1000 PT Dual Port Server Connection
+- Intel(R) PRO/1000 PT Dual Port Server Adapter
+- Intel(R) PRO/1000 PF Dual Port Server Adapter
+- Intel(R) PRO/1000 PT Quad Port Server Adapter
+- Intel(R) Gigabit PT Quad Port Server ExpressModule
 
-  In most cases Wake On LAN is only supported on port A for multiple port
-  adapters. To verify if a port supports Wake on Lan run ethtool eth<X>.
 
 Support
-=======
-
+-------
 For general information, go to the Intel support website at:
-
-    www.intel.com/support/
+http://www.intel.com/support/
 
 or the Intel Wired Networking project hosted by Sourceforge at:
-
-    http://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
+http://sourceforge.net/projects/e1000
+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.