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55877012d5
Add documentation describing the drivers use of ethtool ntuple filters, including the limitations that it has due to hardware, as well as how it reads and parses the user-def data block. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
191 lines
6.6 KiB
Plaintext
191 lines
6.6 KiB
Plaintext
Linux Base Driver for the Intel(R) Ethernet Controller XL710 Family
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===================================================================
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Intel i40e Linux driver.
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Copyright(c) 2013 Intel Corporation.
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Contents
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========
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- Identifying Your Adapter
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- Additional Configurations
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- Performance Tuning
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- Known Issues
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- Support
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Identifying Your Adapter
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========================
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The driver in this release is compatible with the Intel Ethernet
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Controller XL710 Family.
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For more information on how to identify your adapter, go to the Adapter &
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Driver ID Guide at:
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http://support.intel.com/support/network/sb/CS-012904.htm
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Enabling the driver
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===================
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The driver is enabled via the standard kernel configuration system,
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using the make command:
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Make oldconfig/silentoldconfig/menuconfig/etc.
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The driver is located in the menu structure at:
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-> Device Drivers
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-> Network device support (NETDEVICES [=y])
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-> Ethernet driver support
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-> Intel devices
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-> Intel(R) Ethernet Controller XL710 Family
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Additional Configurations
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=========================
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Generic Receive Offload (GRO)
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-----------------------------
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The driver supports the in-kernel software implementation of GRO. GRO has
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shown that by coalescing Rx traffic into larger chunks of data, CPU
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utilization can be significantly reduced when under large Rx load. GRO is
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an evolution of the previously-used LRO interface. GRO is able to coalesce
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other protocols besides TCP. It's also safe to use with configurations that
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are problematic for LRO, namely bridging and iSCSI.
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Ethtool
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-------
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The driver utilizes the ethtool interface for driver configuration and
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diagnostics, as well as displaying statistical information. The latest
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ethtool version is required for this functionality.
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The latest release of ethtool can be found from
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https://www.kernel.org/pub/software/network/ethtool
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Flow Director n-ntuple traffic filters (FDir)
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---------------------------------------------
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The driver utilizes the ethtool interface for configuring ntuple filters,
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via "ethtool -N <device> <filter>".
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The sctp4, ip4, udp4, and tcp4 flow types are supported with the standard
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fields including src-ip, dst-ip, src-port and dst-port. The driver only
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supports fully enabling or fully masking the fields, so use of the mask
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fields for partial matches is not supported.
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Additionally, the driver supports using the action to specify filters for a
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Virtual Function. You can specify the action as a 64bit value, where the
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lower 32 bits represents the queue number, while the next 8 bits represent
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which VF. Note that 0 is the PF, so the VF identifier is offset by 1. For
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example:
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... action 0x800000002 ...
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Would indicate to direct traffic for Virtual Function 7 (8 minus 1) on queue
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2 of that VF.
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The driver also supports using the user-defined field to specify 2 bytes of
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arbitrary data to match within the packet payload in addition to the regular
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fields. The data is specified in the lower 32bits of the user-def field in
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the following way:
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+----------------------------+---------------------------+
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| 31 28 24 20 16 | 15 12 8 4 0|
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+----------------------------+---------------------------+
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| offset into packet payload | 2 bytes of flexible data |
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+----------------------------+---------------------------+
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As an example,
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... user-def 0x4FFFF ....
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means to match the value 0xFFFF 4 bytes into the packet payload. Note that
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the offset is based on the beginning of the payload, and not the beginning
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of the packet. Thus
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flow-type tcp4 ... user-def 0x8BEAF ....
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would match TCP/IPv4 packets which have the value 0xBEAF 8bytes into the
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TCP/IPv4 payload.
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For ICMP, the hardware parses the ICMP header as 4 bytes of header and 4
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bytes of payload, so if you want to match an ICMP frames payload you may need
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to add 4 to the offset in order to match the data.
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Furthermore, the offset can only be up to a value of 64, as the hardware
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will only read up to 64 bytes of data from the payload. It must also be even
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as the flexible data is 2 bytes long and must be aligned to byte 0 of the
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packet payload.
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When programming filters, the hardware is limited to using a single input
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set for each flow type. This means that it is an error to program two
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different filters with the same type that don't match on the same fields.
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Thus the second of the following two commands will fail:
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ethtool -N <device> flow-type tcp4 src-ip 192.168.0.7 action 5
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ethtool -N <device> flow-type tcp4 dst-ip 192.168.15.18 action 1
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This is because the first filter will be accepted and reprogram the input
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set for TCPv4 filters, but the second filter will be unable to reprogram the
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input set until all the conflicting TCPv4 filters are first removed.
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Note that the user-defined flexible offset is also considered part of the
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input set and cannot be programmed separately for multiple filters of the
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same type. However, the flexible data is not part of the input set and
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multiple filters may use the same offset but match against different data.
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Data Center Bridging (DCB)
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--------------------------
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DCB configuration is not currently supported.
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FCoE
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----
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The driver supports Fiber Channel over Ethernet (FCoE) and Data Center
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Bridging (DCB) functionality. Configuring DCB and FCoE is outside the scope
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of this driver doc. Refer to http://www.open-fcoe.org/ for FCoE project
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information and http://www.open-lldp.org/ or email list
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e1000-eedc@lists.sourceforge.net for DCB information.
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MAC and VLAN anti-spoofing feature
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----------------------------------
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When a malicious driver attempts to send a spoofed packet, it is dropped by
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the hardware and not transmitted. An interrupt is sent to the PF driver
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notifying it of the spoof attempt.
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When a spoofed packet is detected the PF driver will send the following
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message to the system log (displayed by the "dmesg" command):
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Spoof event(s) detected on VF (n)
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Where n=the VF that attempted to do the spoofing.
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Performance Tuning
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==================
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An excellent article on performance tuning can be found at:
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http://www.redhat.com/promo/summit/2008/downloads/pdf/Thursday/Mark_Wagner.pdf
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Known Issues
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============
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Support
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=======
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For general information, go to the Intel support website at:
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http://support.intel.com
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or the Intel Wired Networking project hosted by Sourceforge at:
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http://e1000.sourceforge.net
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If an issue is identified with the released source code on the supported
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kernel with a supported adapter, email the specific information related
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to the issue to e1000-devel@lists.sourceforge.net and copy
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netdev@vger.kernel.org.
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