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Documentation: iavf: Update the Intel LAN driver doc for iavf
Update the LAN driver documentation to include the latest feature implementation and driver capabilities. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com>
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Jeff Kirsher
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@ -10,11 +10,15 @@ Copyright(c) 2013-2018 Intel Corporation.
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Contents
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========
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- Overview
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- Identifying Your Adapter
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- Additional Configurations
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- Known Issues/Troubleshooting
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- Support
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Overview
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========
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This file describes the iavf Linux* Base Driver. This driver was formerly
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called i40evf.
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@ -27,6 +31,7 @@ The guest OS loading the iavf driver must support MSI-X interrupts.
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Identifying Your Adapter
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========================
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The driver in this kernel is compatible with devices based on the following:
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* Intel(R) XL710 X710 Virtual Function
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* Intel(R) X722 Virtual Function
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@ -50,9 +55,10 @@ Link messages will not be displayed to the console if the distribution is
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restricting system messages. In order to see network driver link messages on
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your console, set dmesg to eight by entering the following::
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dmesg -n 8
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# dmesg -n 8
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NOTE: This setting is not saved across reboots.
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NOTE:
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This setting is not saved across reboots.
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ethtool
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-------
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@ -72,11 +78,11 @@ then requests from that VF to set VLAN tag stripping will be ignored.
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To enable/disable VLAN tag stripping for a VF, issue the following command
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from inside the VM in which you are running the VF::
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ethtool -K <if_name> rxvlan on/off
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# ethtool -K <if_name> rxvlan on/off
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or alternatively::
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ethtool --offload <if_name> rxvlan on/off
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# ethtool --offload <if_name> rxvlan on/off
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Adaptive Virtual Function
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-------------------------
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@ -91,21 +97,21 @@ additional features depending on what features are available in the PF with
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which the AVF is associated. The following are base mode features:
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- 4 Queue Pairs (QP) and associated Configuration Status Registers (CSRs)
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for Tx/Rx.
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- i40e descriptors and ring format.
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- Descriptor write-back completion.
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- 1 control queue, with i40e descriptors, CSRs and ring format.
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- 5 MSI-X interrupt vectors and corresponding i40e CSRs.
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- 1 Interrupt Throttle Rate (ITR) index.
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- 1 Virtual Station Interface (VSI) per VF.
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for Tx/Rx
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- i40e descriptors and ring format
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- Descriptor write-back completion
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- 1 control queue, with i40e descriptors, CSRs and ring format
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- 5 MSI-X interrupt vectors and corresponding i40e CSRs
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- 1 Interrupt Throttle Rate (ITR) index
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- 1 Virtual Station Interface (VSI) per VF
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- 1 Traffic Class (TC), TC0
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- Receive Side Scaling (RSS) with 64 entry indirection table and key,
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configured through the PF.
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- 1 unicast MAC address reserved per VF.
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- 16 MAC address filters for each VF.
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- Stateless offloads - non-tunneled checksums.
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- AVF device ID.
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- HW mailbox is used for VF to PF communications (including on Windows).
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configured through the PF
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- 1 unicast MAC address reserved per VF
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- 16 MAC address filters for each VF
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- Stateless offloads - non-tunneled checksums
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- AVF device ID
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- HW mailbox is used for VF to PF communications (including on Windows)
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IEEE 802.1ad (QinQ) Support
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---------------------------
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@ -117,8 +123,8 @@ VLAN ID, among other uses.
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The following are examples of how to configure 802.1ad (QinQ)::
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ip link add link eth0 eth0.24 type vlan proto 802.1ad id 24
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ip link add link eth0.24 eth0.24.371 type vlan proto 802.1Q id 371
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# ip link add link eth0 eth0.24 type vlan proto 802.1ad id 24
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# ip link add link eth0.24 eth0.24.371 type vlan proto 802.1Q id 371
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Where "24" and "371" are example VLAN IDs.
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@ -133,6 +139,19 @@ specific application. This can reduce latency for the specified application,
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and allow Tx traffic to be rate limited per application. Follow the steps below
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to set ADq.
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Requirements:
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- The sch_mqprio, act_mirred and cls_flower modules must be loaded
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- The latest version of iproute2
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- If another driver (for example, DPDK) has set cloud filters, you cannot
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enable ADQ
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- Depending on the underlying PF device, ADQ cannot be enabled when the
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following features are enabled:
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+ Data Center Bridging (DCB)
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+ Multiple Functions per Port (MFP)
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+ Sideband Filters
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1. Create traffic classes (TCs). Maximum of 8 TCs can be created per interface.
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The shaper bw_rlimit parameter is optional.
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@ -141,9 +160,9 @@ to 1Gbit for tc0 and 3Gbit for tc1.
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::
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# tc qdisc add dev <interface> root mqprio num_tc 2 map 0 0 0 0 1 1 1 1
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queues 16@0 16@16 hw 1 mode channel shaper bw_rlimit min_rate 1Gbit 2Gbit
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max_rate 1Gbit 3Gbit
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tc qdisc add dev <interface> root mqprio num_tc 2 map 0 0 0 0 1 1 1 1
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queues 16@0 16@16 hw 1 mode channel shaper bw_rlimit min_rate 1Gbit 2Gbit
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max_rate 1Gbit 3Gbit
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map: priority mapping for up to 16 priorities to tcs (e.g. map 0 0 0 0 1 1 1 1
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sets priorities 0-3 to use tc0 and 4-7 to use tc1)
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@ -162,6 +181,10 @@ Totals must be equal or less than port speed.
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For example: min_rate 1Gbit 3Gbit: Verify bandwidth limit using network
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monitoring tools such as ifstat or sar –n DEV [interval] [number of samples]
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NOTE:
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Setting up channels via ethtool (ethtool -L) is not supported when the
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TCs are configured using mqprio.
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2. Enable HW TC offload on interface::
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# ethtool -K <interface> hw-tc-offload on
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@ -171,16 +194,16 @@ monitoring tools such as ifstat or sar –n DEV [interval] [number of samples]
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# tc qdisc add dev <interface> ingress
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NOTES:
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- Run all tc commands from the iproute2 <pathtoiproute2>/tc/ directory.
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- ADq is not compatible with cloud filters.
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- Run all tc commands from the iproute2 <pathtoiproute2>/tc/ directory
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- ADq is not compatible with cloud filters
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- Setting up channels via ethtool (ethtool -L) is not supported when the TCs
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are configured using mqprio.
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are configured using mqprio
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- You must have iproute2 latest version
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- NVM version 6.01 or later is required.
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- NVM version 6.01 or later is required
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- ADq cannot be enabled when any the following features are enabled: Data
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Center Bridging (DCB), Multiple Functions per Port (MFP), or Sideband Filters.
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Center Bridging (DCB), Multiple Functions per Port (MFP), or Sideband Filters
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- If another driver (for example, DPDK) has set cloud filters, you cannot
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enable ADq.
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enable ADq
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- Tunnel filters are not supported in ADq. If encapsulated packets do arrive
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in non-tunnel mode, filtering will be done on the inner headers. For example,
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for VXLAN traffic in non-tunnel mode, PCTYPE is identified as a VXLAN
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@ -198,6 +221,16 @@ NOTES:
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Known Issues/Troubleshooting
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============================
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Bonding fails with VFs bound to an Intel(R) Ethernet Controller 700 series device
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---------------------------------------------------------------------------------
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If you bind Virtual Functions (VFs) to an Intel(R) Ethernet Controller 700
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series based device, the VF slaves may fail when they become the active slave.
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If the MAC address of the VF is set by the PF (Physical Function) of the
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device, when you add a slave, or change the active-backup slave, Linux bonding
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tries to sync the backup slave's MAC address to the same MAC address as the
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active slave. Linux bonding will fail at this point. This issue will not occur
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if the VF's MAC address is not set by the PF.
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Traffic Is Not Being Passed Between VM and Client
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-------------------------------------------------
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You may not be able to pass traffic between a client system and a
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@ -215,13 +248,28 @@ Do not unload a port's driver if a Virtual Function (VF) with an active Virtual
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Machine (VM) is bound to it. Doing so will cause the port to appear to hang.
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Once the VM shuts down, or otherwise releases the VF, the command will complete.
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Using four traffic classes fails
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--------------------------------
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Do not try to reserve more than three traffic classes in the iavf driver. Doing
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so will fail to set any traffic classes and will cause the driver to write
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errors to stdout. Use a maximum of three queues to avoid this issue.
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Multiple log error messages on iavf driver removal
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--------------------------------------------------
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If you have several VFs and you remove the iavf driver, several instances of
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the following log errors are written to the log::
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Unable to send opcode 2 to PF, err I40E_ERR_QUEUE_EMPTY, aq_err ok
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Unable to send the message to VF 2 aq_err 12
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ARQ Overflow Error detected
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Virtual machine does not get link
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---------------------------------
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If the virtual machine has more than one virtual port assigned to it, and those
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virtual ports are bound to different physical ports, you may not get link on
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all of the virtual ports. The following command may work around the issue::
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ethtool -r <PF>
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# ethtool -r <PF>
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Where <PF> is the PF interface in the host, for example: p5p1. You may need to
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run the command more than once to get link on all virtual ports.
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@ -251,12 +299,13 @@ traffic.
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If you have multiple interfaces in a server, either turn on ARP filtering by
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entering::
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echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
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# echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
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NOTE: This setting is not saved across reboots. The configuration change can be
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made permanent by adding the following line to the file /etc/sysctl.conf::
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NOTE:
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This setting is not saved across reboots. The configuration change can be
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made permanent by adding the following line to the file /etc/sysctl.conf::
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net.ipv4.conf.all.arp_filter = 1
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net.ipv4.conf.all.arp_filter = 1
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Another alternative is to install the interfaces in separate broadcast domains
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(either in different switches or in a switch partitioned to VLANs).
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