Linux Base Driver for 10 Gigabit PCI Express Intel(R) Network Connection ======================================================================== Intel Gigabit Linux driver. Copyright(c) 1999 - 2010 Intel Corporation. Contents ======== - Identifying Your Adapter - Additional Configurations - Performance Tuning - Known Issues - Support Identifying Your Adapter ======================== The driver in this release is compatible with 82598 and 82599-based Intel Network Connections. For more information on how to identify your adapter, go to the Adapter & Driver ID Guide at: http://support.intel.com/support/network/sb/CS-012904.htm SFP+ Devices with Pluggable Optics ---------------------------------- 82599-BASED ADAPTERS NOTES: If your 82599-based Intel(R) Network Adapter came with Intel optics, or is an Intel(R) Ethernet Server Adapter X520-2, then it only supports Intel optics and/or the direct attach cables listed below. When 82599-based SFP+ devices are connected back to back, they should be set to the same Speed setting via Ethtool. Results may vary if you mix speed settings. 82598-based adapters support all passive direct attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Active direct attach cables are not supported. Supplier Type Part Numbers SR Modules Intel DUAL RATE 1G/10G SFP+ SR (bailed) FTLX8571D3BCV-IT Intel DUAL RATE 1G/10G SFP+ SR (bailed) AFBR-703SDDZ-IN1 Intel DUAL RATE 1G/10G SFP+ SR (bailed) AFBR-703SDZ-IN2 LR Modules Intel DUAL RATE 1G/10G SFP+ LR (bailed) FTLX1471D3BCV-IT Intel DUAL RATE 1G/10G SFP+ LR (bailed) AFCT-701SDDZ-IN1 Intel DUAL RATE 1G/10G SFP+ LR (bailed) AFCT-701SDZ-IN2 The following is a list of 3rd party SFP+ modules and direct attach cables that have received some testing. Not all modules are applicable to all devices. Supplier Type Part Numbers Finisar SFP+ SR bailed, 10g single rate FTLX8571D3BCL Avago SFP+ SR bailed, 10g single rate AFBR-700SDZ Finisar SFP+ LR bailed, 10g single rate FTLX1471D3BCL Finisar DUAL RATE 1G/10G SFP+ SR (No Bail) FTLX8571D3QCV-IT Avago DUAL RATE 1G/10G SFP+ SR (No Bail) AFBR-703SDZ-IN1 Finisar DUAL RATE 1G/10G SFP+ LR (No Bail) FTLX1471D3QCV-IT Avago DUAL RATE 1G/10G SFP+ LR (No Bail) AFCT-701SDZ-IN1 Finistar 1000BASE-T SFP FCLF8522P2BTL Avago 1000BASE-T SFP ABCU-5710RZ 82599-based adapters support all passive and active limiting direct attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Laser turns off for SFP+ when ifconfig down ------------------------------------------- "ifconfig down" turns off the laser for 82599-based SFP+ fiber adapters. "ifconfig up" turns on the later. 82598-BASED ADAPTERS NOTES for 82598-Based Adapters: - Intel(R) Network Adapters that support removable optical modules only support their original module type (i.e., the Intel(R) 10 Gigabit SR Dual Port Express Module only supports SR optical modules). If you plug in a different type of module, the driver will not load. - Hot Swapping/hot plugging optical modules is not supported. - Only single speed, 10 gigabit modules are supported. - LAN on Motherboard (LOMs) may support DA, SR, or LR modules. Other module types are not supported. Please see your system documentation for details. The following is a list of 3rd party SFP+ modules and direct attach cables that have received some testing. Not all modules are applicable to all devices. Supplier Type Part Numbers Finisar SFP+ SR bailed, 10g single rate FTLX8571D3BCL Avago SFP+ SR bailed, 10g single rate AFBR-700SDZ Finisar SFP+ LR bailed, 10g single rate FTLX1471D3BCL 82598-based adapters support all passive direct attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications. Active direct attach cables are not supported. Flow Control ------------ Ethernet Flow Control (IEEE 802.3x) can be configured with ethtool to enable receiving and transmitting pause frames for ixgbe. When TX is enabled, PAUSE frames are generated when the receive packet buffer crosses a predefined threshold. When rx is enabled, the transmit unit will halt for the time delay specified when a PAUSE frame is received. Flow Control is enabled by default. If you want to disable a flow control capable link partner, use Ethtool: ethtool -A eth? autoneg off RX off TX off NOTE: For 82598 backplane cards entering 1 gig mode, flow control default behavior is changed to off. Flow control in 1 gig mode on these devices can lead to Tx hangs. Additional Configurations ========================= Jumbo Frames ------------ The driver supports Jumbo Frames for all adapters. Jumbo Frames support is enabled by changing the MTU to a value larger than the default of 1500. The maximum value for the MTU is 16110. Use the ifconfig command to increase the MTU size. For example: ifconfig ethx mtu 9000 up The maximum MTU setting for Jumbo Frames is 16110. This value coincides with the maximum Jumbo Frames size of 16128. Generic Receive Offload, aka GRO -------------------------------- The driver supports the in-kernel software implementation of GRO. GRO has shown that by coalescing Rx traffic into larger chunks of data, CPU utilization can be significantly reduced when under large Rx load. GRO is an evolution of the previously-used LRO interface. GRO is able to coalesce other protocols besides TCP. It's also safe to use with configurations that are problematic for LRO, namely bridging and iSCSI. Data Center Bridging, aka DCB ----------------------------- DCB is a configuration Quality of Service implementation in hardware. It uses the VLAN priority tag (802.1p) to filter traffic. That means that there are 8 different priorities that traffic can be filtered into. It also enables priority flow control which can limit or eliminate the number of dropped packets during network stress. Bandwidth can be allocated to each of these priorities, which is enforced at the hardware level. To enable DCB support in ixgbe, you must enable the DCB netlink layer to allow the userspace tools (see below) to communicate with the driver. This can be found in the kernel configuration here: -> Networking support -> Networking options -> Data Center Bridging support Once this is selected, DCB support must be selected for ixgbe. This can be found here: -> Device Drivers -> Network device support (NETDEVICES [=y]) -> Ethernet (10000 Mbit) (NETDEV_10000 [=y]) -> Intel(R) 10GbE PCI Express adapters support -> Data Center Bridging (DCB) Support After these options are selected, you must rebuild your kernel and your modules. In order to use DCB, userspace tools must be downloaded and installed. The dcbd tools can be found at: http://e1000.sf.net 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. The latest release of ethtool can be found from http://sourceforge.net/projects/gkernel. FCoE ---- This release of the ixgbe driver contains new code to enable users to use Fiber Channel over Ethernet (FCoE) and Data Center Bridging (DCB) functionality that is supported by the 82598-based hardware. This code has no default effect on the regular driver operation, and configuring DCB and FCoE is outside the scope of this driver README. Refer to http://www.open-fcoe.org/ for FCoE project information and contact e1000-eedc@lists.sourceforge.net for DCB information. 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. Performance Tuning ================== An excellent article on performance tuning can be found at: http://www.redhat.com/promo/summit/2008/downloads/pdf/Thursday/Mark_Wagner.pdf Known Issues ============ Enabling SR-IOV in a 32-bit Microsoft* Windows* Server 2008 Guest OS using Intel (R) 82576-based GbE or Intel (R) 82599-based 10GbE controller under KVM ----------------------------------------------------------------------------- KVM Hypervisor/VMM supports direct assignment of a PCIe device to a VM. This includes traditional PCIe devices, as well as SR-IOV-capable devices using Intel 82576-based and 82599-based controllers. While direct assignment of a PCIe device or an SR-IOV Virtual Function (VF) to a Linux-based VM running 2.6.32 or later kernel works fine, there is a known issue with Microsoft Windows Server 2008 VM that results in a "yellow bang" error. This problem is within the KVM VMM itself, not the Intel driver, or the SR-IOV logic of the VMM, but rather that KVM emulates an older CPU model for the guests, and this older CPU model does not support MSI-X interrupts, which is a requirement for Intel SR-IOV. If you wish to use the Intel 82576 or 82599-based controllers in SR-IOV mode with KVM and a Microsoft Windows Server 2008 guest try the following workaround. The workaround is to tell KVM to emulate a different model of CPU when using qemu to create the KVM guest: "-cpu qemu64,model=13" Support ======= For general information, go to the Intel support website at: http://support.intel.com or the Intel Wired Networking project hosted by Sourceforge at: http://e1000.sourceforge.net 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