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net: aquantia: add documentation for the atlantic driver
Document contains configuration options description, details and examples of driver various settings. Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Igor Russkikh
David S. Miller
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Documentation/networking/device_drivers/aquantia/atlantic.txt
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Documentation/networking/device_drivers/aquantia/atlantic.txt
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aQuantia AQtion Driver for the aQuantia Multi-Gigabit PCI Express Family of
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Ethernet Adapters
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=============================================================================
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Contents
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========
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- Identifying Your Adapter
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- Configuration
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- Supported ethtool options
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- Command Line Parameters
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- Config file parameters
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- Support
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- License
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Identifying Your Adapter
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========================
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The driver in this release is compatible with AQC-100, AQC-107, AQC-108 based ethernet adapters.
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SFP+ Devices (for AQC-100 based adapters)
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----------------------------------
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This release tested with passive Direct Attach Cables (DAC) and SFP+/LC Optical Transceiver.
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Configuration
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=========================
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Viewing Link Messages
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---------------------
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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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NOTE: This setting is not saved across reboots.
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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 16000. Use the `ip` command to
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increase the MTU size. For example:
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ip link set mtu 16000 dev enp1s0
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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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NAPI
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----
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NAPI (Rx polling mode) is supported in the atlantic driver.
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Supported ethtool options
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============================
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Viewing adapter settings
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---------------------
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ethtool <ethX>
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Output example:
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Settings for enp1s0:
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Supported ports: [ TP ]
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Supported link modes: 100baseT/Full
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1000baseT/Full
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10000baseT/Full
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2500baseT/Full
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5000baseT/Full
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Supported pause frame use: Symmetric
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Supports auto-negotiation: Yes
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Supported FEC modes: Not reported
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Advertised link modes: 100baseT/Full
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1000baseT/Full
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10000baseT/Full
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2500baseT/Full
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5000baseT/Full
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Advertised pause frame use: Symmetric
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Advertised auto-negotiation: Yes
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Advertised FEC modes: Not reported
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Speed: 10000Mb/s
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Duplex: Full
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Port: Twisted Pair
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PHYAD: 0
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Transceiver: internal
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Auto-negotiation: on
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MDI-X: Unknown
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Supports Wake-on: g
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Wake-on: d
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Link detected: yes
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---
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Note: AQrate speeds (2.5/5 Gb/s) will be displayed only with linux kernels > 4.10.
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But you can still use these speeds:
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ethtool -s eth0 autoneg off speed 2500
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Viewing adapter information
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---------------------
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ethtool -i <ethX>
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Output example:
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driver: atlantic
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version: 5.2.0-050200rc5-generic-kern
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firmware-version: 3.1.78
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expansion-rom-version:
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bus-info: 0000:01:00.0
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supports-statistics: yes
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supports-test: no
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supports-eeprom-access: no
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supports-register-dump: yes
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supports-priv-flags: no
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Viewing Ethernet adapter statistics:
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---------------------
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ethtool -S <ethX>
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Output example:
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NIC statistics:
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InPackets: 13238607
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InUCast: 13293852
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InMCast: 52
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InBCast: 3
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InErrors: 0
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OutPackets: 23703019
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OutUCast: 23704941
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OutMCast: 67
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OutBCast: 11
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InUCastOctects: 213182760
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OutUCastOctects: 22698443
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InMCastOctects: 6600
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OutMCastOctects: 8776
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InBCastOctects: 192
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OutBCastOctects: 704
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InOctects: 2131839552
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OutOctects: 226938073
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InPacketsDma: 95532300
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OutPacketsDma: 59503397
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InOctetsDma: 1137102462
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OutOctetsDma: 2394339518
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InDroppedDma: 0
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Queue[0] InPackets: 23567131
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Queue[0] OutPackets: 20070028
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Queue[0] InJumboPackets: 0
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Queue[0] InLroPackets: 0
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Queue[0] InErrors: 0
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Queue[1] InPackets: 45428967
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Queue[1] OutPackets: 11306178
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Queue[1] InJumboPackets: 0
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Queue[1] InLroPackets: 0
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Queue[1] InErrors: 0
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Queue[2] InPackets: 3187011
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Queue[2] OutPackets: 13080381
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Queue[2] InJumboPackets: 0
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Queue[2] InLroPackets: 0
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Queue[2] InErrors: 0
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Queue[3] InPackets: 23349136
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Queue[3] OutPackets: 15046810
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Queue[3] InJumboPackets: 0
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Queue[3] InLroPackets: 0
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Queue[3] InErrors: 0
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Interrupt coalescing support
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---------------------------------
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ITR mode, TX/RX coalescing timings could be viewed with:
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ethtool -c <ethX>
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and changed with:
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ethtool -C <ethX> tx-usecs <usecs> rx-usecs <usecs>
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To disable coalescing:
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ethtool -C <ethX> tx-usecs 0 rx-usecs 0 tx-max-frames 1 tx-max-frames 1
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Wake on LAN support
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---------------------------------
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WOL support by magic packet:
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ethtool -s <ethX> wol g
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To disable WOL:
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ethtool -s <ethX> wol d
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Set and check the driver message level
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---------------------------------
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Set message level
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ethtool -s <ethX> msglvl <level>
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Level values:
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0x0001 - general driver status.
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0x0002 - hardware probing.
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0x0004 - link state.
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0x0008 - periodic status check.
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0x0010 - interface being brought down.
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0x0020 - interface being brought up.
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0x0040 - receive error.
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0x0080 - transmit error.
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0x0200 - interrupt handling.
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0x0400 - transmit completion.
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0x0800 - receive completion.
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0x1000 - packet contents.
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0x2000 - hardware status.
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0x4000 - Wake-on-LAN status.
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By default, the level of debugging messages is set 0x0001(general driver status).
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Check message level
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ethtool <ethX> | grep "Current message level"
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If you want to disable the output of messages
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ethtool -s <ethX> msglvl 0
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RX flow rules (ntuple filters)
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---------------------------------
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There are separate rules supported, that applies in that order:
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1. 16 VLAN ID rules
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2. 16 L2 EtherType rules
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3. 8 L3/L4 5-Tuple rules
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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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To enable or disable the RX flow rules:
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ethtool -K ethX ntuple <on|off>
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When disabling ntuple filters, all the user programed filters are
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flushed from the driver cache and hardware. All needed filters must
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be re-added when ntuple is re-enabled.
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Because of the fixed order of the rules, the location of filters is also fixed:
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- Locations 0 - 15 for VLAN ID filters
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- Locations 16 - 31 for L2 EtherType filters
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- Locations 32 - 39 for L3/L4 5-tuple filters (locations 32, 36 for IPv6)
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The L3/L4 5-tuple (protocol, source and destination IP address, source and
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destination TCP/UDP/SCTP port) is compared against 8 filters. For IPv4, up to
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8 source and destination addresses can be matched. For IPv6, up to 2 pairs of
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addresses can be supported. Source and destination ports are only compared for
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TCP/UDP/SCTP packets.
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To add a filter that directs packet to queue 5, use <-N|-U|--config-nfc|--config-ntuple> switch:
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ethtool -N <ethX> flow-type udp4 src-ip 10.0.0.1 dst-ip 10.0.0.2 src-port 2000 dst-port 2001 action 5 <loc 32>
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- action is the queue number.
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- loc is the rule number.
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For "flow-type ip4|udp4|tcp4|sctp4|ip6|udp6|tcp6|sctp6" you must set the loc
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number within 32 - 39.
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For "flow-type ip4|udp4|tcp4|sctp4|ip6|udp6|tcp6|sctp6" you can set 8 rules
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for traffic IPv4 or you can set 2 rules for traffic IPv6. Loc number traffic
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IPv6 is 32 and 36.
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At the moment you can not use IPv4 and IPv6 filters at the same time.
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Example filter for IPv6 filter traffic:
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sudo ethtool -N <ethX> flow-type tcp6 src-ip 2001:db8:0:f101::1 dst-ip 2001:db8:0:f101::2 action 1 loc 32
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sudo ethtool -N <ethX> flow-type ip6 src-ip 2001:db8:0:f101::2 dst-ip 2001:db8:0:f101::5 action -1 loc 36
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Example filter for IPv4 filter traffic:
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sudo ethtool -N <ethX> flow-type udp4 src-ip 10.0.0.4 dst-ip 10.0.0.7 src-port 2000 dst-port 2001 loc 32
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sudo ethtool -N <ethX> flow-type tcp4 src-ip 10.0.0.3 dst-ip 10.0.0.9 src-port 2000 dst-port 2001 loc 33
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sudo ethtool -N <ethX> flow-type ip4 src-ip 10.0.0.6 dst-ip 10.0.0.4 loc 34
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If you set action -1, then all traffic corresponding to the filter will be discarded.
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The maximum value action is 31.
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The VLAN filter (VLAN id) is compared against 16 filters.
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VLAN id must be accompanied by mask 0xF000. That is to distinguish VLAN filter
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from L2 Ethertype filter with UserPriority since both User Priority and VLAN ID
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are passed in the same 'vlan' parameter.
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To add a filter that directs packets from VLAN 2001 to queue 5:
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ethtool -N <ethX> flow-type ip4 vlan 2001 m 0xF000 action 1 loc 0
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L2 EtherType filters allows filter packet by EtherType field or both EtherType
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and User Priority (PCP) field of 802.1Q.
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UserPriority (vlan) parameter must be accompanied by mask 0x1FFF. That is to
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distinguish VLAN filter from L2 Ethertype filter with UserPriority since both
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User Priority and VLAN ID are passed in the same 'vlan' parameter.
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To add a filter that directs IP4 packess of priority 3 to queue 3:
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ethtool -N <ethX> flow-type ether proto 0x800 vlan 0x600 m 0x1FFF action 3 loc 16
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To see the list of filters currently present:
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ethtool <-u|-n|--show-nfc|--show-ntuple> <ethX>
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Rules may be deleted from the table itself. This is done using:
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sudo ethtool <-N|-U|--config-nfc|--config-ntuple> <ethX> delete <loc>
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- loc is the rule number to be deleted.
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Rx filters is an interface to load the filter table that funnels all flow
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into queue 0 unless an alternative queue is specified using "action". In that
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case, any flow that matches the filter criteria will be directed to the
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appropriate queue. RX filters is supported on all kernels 2.6.30 and later.
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RSS for UDP
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---------------------------------
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Currently, NIC does not support RSS for fragmented IP packets, which leads to
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incorrect working of RSS for fragmented UDP traffic. To disable RSS for UDP the
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RX Flow L3/L4 rule may be used.
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Example:
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ethtool -N eth0 flow-type udp4 action 0 loc 32
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Command Line Parameters
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=======================
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The following command line parameters are available on atlantic driver:
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aq_itr -Interrupt throttling mode
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----------------------------------------
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Accepted values: 0, 1, 0xFFFF
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Default value: 0xFFFF
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0 - Disable interrupt throttling.
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1 - Enable interrupt throttling and use specified tx and rx rates.
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0xFFFF - Auto throttling mode. Driver will choose the best RX and TX
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interrupt throtting settings based on link speed.
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aq_itr_tx - TX interrupt throttle rate
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----------------------------------------
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Accepted values: 0 - 0x1FF
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Default value: 0
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TX side throttling in microseconds. Adapter will setup maximum interrupt delay
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to this value. Minimum interrupt delay will be a half of this value
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aq_itr_rx - RX interrupt throttle rate
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----------------------------------------
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Accepted values: 0 - 0x1FF
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Default value: 0
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RX side throttling in microseconds. Adapter will setup maximum interrupt delay
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to this value. Minimum interrupt delay will be a half of this value
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Note: ITR settings could be changed in runtime by ethtool -c means (see below)
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Config file parameters
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=======================
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For some fine tuning and performance optimizations,
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some parameters can be changed in the {source_dir}/aq_cfg.h file.
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AQ_CFG_RX_PAGEORDER
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----------------------------------------
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Default value: 0
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RX page order override. Thats a power of 2 number of RX pages allocated for
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each descriptor. Received descriptor size is still limited by AQ_CFG_RX_FRAME_MAX.
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Increasing pageorder makes page reuse better (actual on iommu enabled systems).
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AQ_CFG_RX_REFILL_THRES
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----------------------------------------
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Default value: 32
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RX refill threshold. RX path will not refill freed descriptors until the
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specified number of free descriptors is observed. Larger values may help
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better page reuse but may lead to packet drops as well.
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AQ_CFG_VECS_DEF
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------------------------------------------------------------
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Number of queues
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Valid Range: 0 - 8 (up to AQ_CFG_VECS_MAX)
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Default value: 8
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Notice this value will be capped by the number of cores available on the system.
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AQ_CFG_IS_RSS_DEF
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------------------------------------------------------------
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Enable/disable Receive Side Scaling
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This feature allows the adapter to distribute receive processing
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across multiple CPU-cores and to prevent from overloading a single CPU core.
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Valid values
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0 - disabled
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1 - enabled
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Default value: 1
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AQ_CFG_NUM_RSS_QUEUES_DEF
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------------------------------------------------------------
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Number of queues for Receive Side Scaling
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Valid Range: 0 - 8 (up to AQ_CFG_VECS_DEF)
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Default value: AQ_CFG_VECS_DEF
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AQ_CFG_IS_LRO_DEF
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------------------------------------------------------------
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Enable/disable Large Receive Offload
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This offload enables the adapter to coalesce multiple TCP segments and indicate
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them as a single coalesced unit to the OS networking subsystem.
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The system consumes less energy but it also introduces more latency in packets processing.
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Valid values
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0 - disabled
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1 - enabled
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Default value: 1
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AQ_CFG_TX_CLEAN_BUDGET
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----------------------------------------
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Maximum descriptors to cleanup on TX at once.
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Default value: 256
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After the aq_cfg.h file changed the driver must be rebuilt to take effect.
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Support
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=======
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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 support@aquantia.com
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License
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=======
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aQuantia Corporation Network Driver
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Copyright(c) 2014 - 2019 aQuantia Corporation.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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Block a user