350 lines
13 KiB
Plaintext
350 lines
13 KiB
Plaintext
Linux* Base Driver for the Intel(R) Ethernet 10 Gigabit PCI Express Family of
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Adapters
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=============================================================================
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Intel 10 Gigabit Linux driver.
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Copyright(c) 1999 - 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 82598, 82599 and X540-based
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Intel Network Connections.
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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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SFP+ Devices with Pluggable Optics
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----------------------------------
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82599-BASED ADAPTERS
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NOTES: If your 82599-based Intel(R) Network Adapter came with Intel optics, or
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is an Intel(R) Ethernet Server Adapter X520-2, then it only supports Intel
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optics and/or the direct attach cables listed below.
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When 82599-based SFP+ devices are connected back to back, they should be set to
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the same Speed setting via ethtool. Results may vary if you mix speed settings.
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82598-based adapters support all passive direct attach cables that comply
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with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Active direct attach
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cables are not supported.
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Supplier Type Part Numbers
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SR Modules
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Intel DUAL RATE 1G/10G SFP+ SR (bailed) FTLX8571D3BCV-IT
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Intel DUAL RATE 1G/10G SFP+ SR (bailed) AFBR-703SDDZ-IN1
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Intel DUAL RATE 1G/10G SFP+ SR (bailed) AFBR-703SDZ-IN2
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LR Modules
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Intel DUAL RATE 1G/10G SFP+ LR (bailed) FTLX1471D3BCV-IT
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Intel DUAL RATE 1G/10G SFP+ LR (bailed) AFCT-701SDDZ-IN1
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Intel DUAL RATE 1G/10G SFP+ LR (bailed) AFCT-701SDZ-IN2
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The following is a list of 3rd party SFP+ modules and direct attach cables that
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have received some testing. Not all modules are applicable to all devices.
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Supplier Type Part Numbers
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Finisar SFP+ SR bailed, 10g single rate FTLX8571D3BCL
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Avago SFP+ SR bailed, 10g single rate AFBR-700SDZ
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Finisar SFP+ LR bailed, 10g single rate FTLX1471D3BCL
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Finisar DUAL RATE 1G/10G SFP+ SR (No Bail) FTLX8571D3QCV-IT
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Avago DUAL RATE 1G/10G SFP+ SR (No Bail) AFBR-703SDZ-IN1
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Finisar DUAL RATE 1G/10G SFP+ LR (No Bail) FTLX1471D3QCV-IT
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Avago DUAL RATE 1G/10G SFP+ LR (No Bail) AFCT-701SDZ-IN1
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Finistar 1000BASE-T SFP FCLF8522P2BTL
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Avago 1000BASE-T SFP ABCU-5710RZ
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82599-based adapters support all passive and active limiting direct attach
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cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications.
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Laser turns off for SFP+ when ifconfig down
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-------------------------------------------
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"ifconfig down" turns off the laser for 82599-based SFP+ fiber adapters.
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"ifconfig up" turns on the laser.
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82598-BASED ADAPTERS
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NOTES for 82598-Based Adapters:
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- Intel(R) Network Adapters that support removable optical modules only support
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their original module type (i.e., the Intel(R) 10 Gigabit SR Dual Port
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Express Module only supports SR optical modules). If you plug in a different
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type of module, the driver will not load.
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- Hot Swapping/hot plugging optical modules is not supported.
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- Only single speed, 10 gigabit modules are supported.
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- LAN on Motherboard (LOMs) may support DA, SR, or LR modules. Other module
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types are not supported. Please see your system documentation for details.
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The following is a list of 3rd party SFP+ modules and direct attach cables that
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have received some testing. Not all modules are applicable to all devices.
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Supplier Type Part Numbers
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Finisar SFP+ SR bailed, 10g single rate FTLX8571D3BCL
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Avago SFP+ SR bailed, 10g single rate AFBR-700SDZ
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Finisar SFP+ LR bailed, 10g single rate FTLX1471D3BCL
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82598-based adapters support all passive direct attach cables that comply
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with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Active direct attach
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cables are not supported.
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Flow Control
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------------
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Ethernet Flow Control (IEEE 802.3x) can be configured with ethtool to enable
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receiving and transmitting pause frames for ixgbe. When TX is enabled, PAUSE
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frames are generated when the receive packet buffer crosses a predefined
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threshold. When rx is enabled, the transmit unit will halt for the time delay
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specified when a PAUSE frame is received.
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Flow Control is enabled by default. If you want to disable a flow control
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capable link partner, use ethtool:
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ethtool -A eth? autoneg off RX off TX off
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NOTE: For 82598 backplane cards entering 1 gig mode, flow control default
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behavior is changed to off. Flow control in 1 gig mode on these devices can
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lead to Tx hangs.
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Intel(R) Ethernet Flow Director
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-------------------------------
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Supports advanced filters that direct receive packets by their flows to
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different queues. Enables tight control on routing a flow in the platform.
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Matches flows and CPU cores for flow affinity. Supports multiple parameters
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for flexible flow classification and load balancing.
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Flow director is enabled only if the kernel is multiple TX queue capable.
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An included script (set_irq_affinity.sh) automates setting the IRQ to CPU
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affinity.
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You can verify that the driver is using Flow Director by looking at the counter
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in ethtool: fdir_miss and fdir_match.
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Other ethtool Commands:
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To enable Flow Director
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ethtool -K ethX ntuple on
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To add a filter
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Use -U switch. e.g., ethtool -U ethX flow-type tcp4 src-ip 0x178000a
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action 1
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To see the list of filters currently present:
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ethtool -u ethX
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Perfect Filter: Perfect filter is an interface to load the filter table that
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funnels all flow into queue_0 unless an alternative queue is specified using
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"action". In that case, any flow that matches the filter criteria will be
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directed to the appropriate queue.
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If the queue is defined as -1, filter will drop matching packets.
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To account for filter matches and misses, there are two stats in ethtool:
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fdir_match and fdir_miss. In addition, rx_queue_N_packets shows the number of
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packets processed by the Nth queue.
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NOTE: Receive Packet Steering (RPS) and Receive Flow Steering (RFS) are not
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compatible with Flow Director. IF Flow Director is enabled, these will be
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disabled.
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The following three parameters impact Flow Director.
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FdirMode
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--------
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Valid Range: 0-2 (0=off, 1=ATR, 2=Perfect filter mode)
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Default Value: 1
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Flow Director filtering modes.
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FdirPballoc
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-----------
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Valid Range: 0-2 (0=64k, 1=128k, 2=256k)
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Default Value: 0
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Flow Director allocated packet buffer size.
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AtrSampleRate
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--------------
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Valid Range: 1-100
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Default Value: 20
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Software ATR Tx packet sample rate. For example, when set to 20, every 20th
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packet, looks to see if the packet will create a new flow.
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Node
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----
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Valid Range: 0-n
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Default Value: 1 (off)
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0 - n: where n is the number of NUMA nodes (i.e. 0 - 3) currently online in
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your system
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1: turns this option off
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The Node parameter will allow you to pick which NUMA node you want to have
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the adapter allocate memory on.
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max_vfs
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-------
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Valid Range: 1-63
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Default Value: 0
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If the value is greater than 0 it will also force the VMDq parameter to be 1
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or more.
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This parameter adds support for SR-IOV. It causes the driver to spawn up to
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max_vfs worth of virtual function.
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Additional Configurations
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=========================
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Jumbo Frames
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------------
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The driver supports Jumbo Frames for all adapters. Jumbo Frames support is
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enabled by changing the MTU to a value larger than the default of 1500.
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The maximum value for the MTU is 16110. Use the ifconfig command to
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increase the MTU size. For example:
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ifconfig ethx mtu 9000 up
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The maximum MTU setting for Jumbo Frames is 16110. This value coincides
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with the maximum Jumbo Frames size of 16128.
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Generic Receive Offload, aka 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 an
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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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Data Center Bridging, aka DCB
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-----------------------------
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DCB is a configuration Quality of Service implementation in hardware.
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It uses the VLAN priority tag (802.1p) to filter traffic. That means
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that there are 8 different priorities that traffic can be filtered into.
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It also enables priority flow control which can limit or eliminate the
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number of dropped packets during network stress. Bandwidth can be
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allocated to each of these priorities, which is enforced at the hardware
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level.
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To enable DCB support in ixgbe, you must enable the DCB netlink layer to
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allow the userspace tools (see below) to communicate with the driver.
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This can be found in the kernel configuration here:
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-> Networking support
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-> Networking options
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-> Data Center Bridging support
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Once this is selected, DCB support must be selected for ixgbe. This can
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be found here:
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-> Device Drivers
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-> Network device support (NETDEVICES [=y])
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-> Ethernet (10000 Mbit) (NETDEV_10000 [=y])
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-> Intel(R) 10GbE PCI Express adapters support
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-> Data Center Bridging (DCB) Support
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After these options are selected, you must rebuild your kernel and your
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modules.
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In order to use DCB, userspace tools must be downloaded and installed.
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The dcbd tools can be found at:
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http://e1000.sf.net
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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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http://ftp.kernel.org/pub/software/network/ethtool/
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FCoE
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----
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This release of the ixgbe driver contains new code to enable users to use
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Fiber Channel over Ethernet (FCoE) and Data Center Bridging (DCB)
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functionality that is supported by the 82598-based hardware. This code has
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no default effect on the regular driver operation, and configuring DCB and
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FCoE is outside the scope of this driver README. Refer to
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http://www.open-fcoe.org/ for FCoE project information and contact
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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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Enabling SR-IOV in a 32-bit or 64-bit Microsoft* Windows* Server 2008/R2
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Guest OS using Intel (R) 82576-based GbE or Intel (R) 82599-based 10GbE
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controller under KVM
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------------------------------------------------------------------------
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KVM Hypervisor/VMM supports direct assignment of a PCIe device to a VM. This
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includes traditional PCIe devices, as well as SR-IOV-capable devices using
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Intel 82576-based and 82599-based controllers.
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While direct assignment of a PCIe device or an SR-IOV Virtual Function (VF)
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to a Linux-based VM running 2.6.32 or later kernel works fine, there is a
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known issue with Microsoft Windows Server 2008 VM that results in a "yellow
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bang" error. This problem is within the KVM VMM itself, not the Intel driver,
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or the SR-IOV logic of the VMM, but rather that KVM emulates an older CPU
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model for the guests, and this older CPU model does not support MSI-X
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interrupts, which is a requirement for Intel SR-IOV.
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If you wish to use the Intel 82576 or 82599-based controllers in SR-IOV mode
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with KVM and a Microsoft Windows Server 2008 guest try the following
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workaround. The workaround is to tell KVM to emulate a different model of CPU
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when using qemu to create the KVM guest:
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"-cpu qemu64,model=13"
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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.sf.net
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