xref: /openbmc/linux/Documentation/networking/device_drivers/ethernet/aquantia/atlantic.rst (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)

.. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>

===============================
Marvell(Aquantia) AQtion Driver
===============================

For the aQuantia Multi-Gigabit PCI Express Family of Ethernet Adapters

.. Contents

    - Identifying Your Adapter
    - Configuration
    - Supported ethtool options
    - Command Line Parameters
    - Config file parameters
    - Support
    - License

Identifying Your Adapter
========================

The driver in this release is compatible with AQC-100, AQC-107, AQC-108
based ethernet adapters.


SFP+ Devices (for AQC-100 based adapters)
-----------------------------------------

This release tested with passive Direct Attach Cables (DAC) and SFP+/LC
Optical Transceiver.

Configuration
=============

Viewing Link Messages
---------------------
  Link messages will not be displayed to the console if the distribution is
  restricting system messages. In order to see network driver link messages on
  your console, set dmesg to eight by entering the following::

       dmesg -n 8

  .. note::

     This setting is not saved across reboots.

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 16000.  Use the `ip` command to
  increase the MTU size.  For example::

	ip link set mtu 16000 dev enp1s0

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.

NAPI
----
  NAPI (Rx polling mode) is supported in the atlantic driver.

Supported ethtool options
=========================

Viewing adapter settings
------------------------

 ::

    ethtool <ethX>

 Output example::

  Settings for enp1s0:
    Supported ports: [ TP ]
    Supported link modes:   100baseT/Full
			    1000baseT/Full
			    10000baseT/Full
			    2500baseT/Full
			    5000baseT/Full
    Supported pause frame use: Symmetric
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  100baseT/Full
			    1000baseT/Full
			    10000baseT/Full
			    2500baseT/Full
			    5000baseT/Full
    Advertised pause frame use: Symmetric
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Speed: 10000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: Unknown
    Supports Wake-on: g
    Wake-on: d
    Link detected: yes


 .. note::

    AQrate speeds (2.5/5 Gb/s) will be displayed only with linux kernels > 4.10.
    But you can still use these speeds::

	ethtool -s eth0 autoneg off speed 2500

Viewing adapter information
---------------------------

 ::

  ethtool -i <ethX>

 Output example::

  driver: atlantic
  version: 5.2.0-050200rc5-generic-kern
  firmware-version: 3.1.78
  expansion-rom-version:
  bus-info: 0000:01:00.0
  supports-statistics: yes
  supports-test: no
  supports-eeprom-access: no
  supports-register-dump: yes
  supports-priv-flags: no


Viewing Ethernet adapter statistics
-----------------------------------

 ::

    ethtool -S <ethX>

 Output example::

  NIC statistics:
     InPackets: 13238607
     InUCast: 13293852
     InMCast: 52
     InBCast: 3
     InErrors: 0
     OutPackets: 23703019
     OutUCast: 23704941
     OutMCast: 67
     OutBCast: 11
     InUCastOctects: 213182760
     OutUCastOctects: 22698443
     InMCastOctects: 6600
     OutMCastOctects: 8776
     InBCastOctects: 192
     OutBCastOctects: 704
     InOctects: 2131839552
     OutOctects: 226938073
     InPacketsDma: 95532300
     OutPacketsDma: 59503397
     InOctetsDma: 1137102462
     OutOctetsDma: 2394339518
     InDroppedDma: 0
     Queue[0] InPackets: 23567131
     Queue[0] OutPackets: 20070028
     Queue[0] InJumboPackets: 0
     Queue[0] InLroPackets: 0
     Queue[0] InErrors: 0
     Queue[1] InPackets: 45428967
     Queue[1] OutPackets: 11306178
     Queue[1] InJumboPackets: 0
     Queue[1] InLroPackets: 0
     Queue[1] InErrors: 0
     Queue[2] InPackets: 3187011
     Queue[2] OutPackets: 13080381
     Queue[2] InJumboPackets: 0
     Queue[2] InLroPackets: 0
     Queue[2] InErrors: 0
     Queue[3] InPackets: 23349136
     Queue[3] OutPackets: 15046810
     Queue[3] InJumboPackets: 0
     Queue[3] InLroPackets: 0
     Queue[3] InErrors: 0

Interrupt coalescing support
----------------------------

 ITR mode, TX/RX coalescing timings could be viewed with::

    ethtool -c <ethX>

 and changed with::

    ethtool -C <ethX> tx-usecs <usecs> rx-usecs <usecs>

 To disable coalescing::

    ethtool -C <ethX> tx-usecs 0 rx-usecs 0 tx-max-frames 1 tx-max-frames 1

Wake on LAN support
-------------------

 WOL support by magic packet::

    ethtool -s <ethX> wol g

 To disable WOL::

    ethtool -s <ethX> wol d

Set and check the driver message level
--------------------------------------

 Set message level

 ::

    ethtool -s <ethX> msglvl <level>

 Level values:

 ======   =============================
 0x0001   general driver status.
 0x0002   hardware probing.
 0x0004   link state.
 0x0008   periodic status check.
 0x0010   interface being brought down.
 0x0020   interface being brought up.
 0x0040   receive error.
 0x0080   transmit error.
 0x0200   interrupt handling.
 0x0400   transmit completion.
 0x0800   receive completion.
 0x1000   packet contents.
 0x2000   hardware status.
 0x4000   Wake-on-LAN status.
 ======   =============================

 By default, the level of debugging messages is set 0x0001(general driver status).

 Check message level

 ::

    ethtool <ethX> | grep "Current message level"

 If you want to disable the output of messages::

    ethtool -s <ethX> msglvl 0

RX flow rules (ntuple filters)
------------------------------

 There are separate rules supported, that applies in that order:

 1. 16 VLAN ID rules
 2. 16 L2 EtherType rules
 3. 8 L3/L4 5-Tuple rules


 The driver utilizes the ethtool interface for configuring ntuple filters,
 via ``ethtool -N <device> <filter>``.

 To enable or disable the RX flow rules::

    ethtool -K ethX ntuple <on|off>

 When disabling ntuple filters, all the user programmed filters are
 flushed from the driver cache and hardware. All needed filters must
 be re-added when ntuple is re-enabled.

 Because of the fixed order of the rules, the location of filters is also fixed:

 - Locations 0 - 15 for VLAN ID filters
 - Locations 16 - 31 for L2 EtherType filters
 - Locations 32 - 39 for L3/L4 5-tuple filters (locations 32, 36 for IPv6)

 The L3/L4 5-tuple (protocol, source and destination IP address, source and
 destination TCP/UDP/SCTP port) is compared against 8 filters. For IPv4, up to
 8 source and destination addresses can be matched. For IPv6, up to 2 pairs of
 addresses can be supported. Source and destination ports are only compared for
 TCP/UDP/SCTP packets.

 To add a filter that directs packet to queue 5, use
 ``<-N|-U|--config-nfc|--config-ntuple>`` switch::

    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>

 - action is the queue number.
 - loc is the rule number.

 For ``flow-type ip4|udp4|tcp4|sctp4|ip6|udp6|tcp6|sctp6`` you must set the loc
 number within 32 - 39.
 For ``flow-type ip4|udp4|tcp4|sctp4|ip6|udp6|tcp6|sctp6`` you can set 8 rules
 for traffic IPv4 or you can set 2 rules for traffic IPv6. Loc number traffic
 IPv6 is 32 and 36.
 At the moment you can not use IPv4 and IPv6 filters at the same time.

 Example filter for IPv6 filter traffic::

    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
    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

 Example filter for IPv4 filter traffic::

    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
    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
    sudo ethtool -N <ethX> flow-type ip4 src-ip 10.0.0.6 dst-ip 10.0.0.4 loc 34

 If you set action -1, then all traffic corresponding to the filter will be discarded.

 The maximum value action is 31.


 The VLAN filter (VLAN id) is compared against 16 filters.
 VLAN id must be accompanied by mask 0xF000. That is to distinguish VLAN filter
 from L2 Ethertype filter with UserPriority since both User Priority and VLAN ID
 are passed in the same 'vlan' parameter.

 To add a filter that directs packets from VLAN 2001 to queue 5::

    ethtool -N <ethX> flow-type ip4 vlan 2001 m 0xF000 action 1 loc 0


 L2 EtherType filters allows filter packet by EtherType field or both EtherType
 and User Priority (PCP) field of 802.1Q.
 UserPriority (vlan) parameter must be accompanied by mask 0x1FFF. That is to
 distinguish VLAN filter from L2 Ethertype filter with UserPriority since both
 User Priority and VLAN ID are passed in the same 'vlan' parameter.

 To add a filter that directs IP4 packess of priority 3 to queue 3::

    ethtool -N <ethX> flow-type ether proto 0x800 vlan 0x600 m 0x1FFF action 3 loc 16

 To see the list of filters currently present::

    ethtool <-u|-n|--show-nfc|--show-ntuple> <ethX>

 Rules may be deleted from the table itself. This is done using::

    sudo ethtool <-N|-U|--config-nfc|--config-ntuple> <ethX> delete <loc>

 - loc is the rule number to be deleted.

 Rx filters is an interface to load the filter table that funnels all flow
 into queue 0 unless an alternative queue is specified using "action". In that
 case, any flow that matches the filter criteria will be directed to the
 appropriate queue. RX filters is supported on all kernels 2.6.30 and later.

RSS for UDP
-----------

 Currently, NIC does not support RSS for fragmented IP packets, which leads to
 incorrect working of RSS for fragmented UDP traffic. To disable RSS for UDP the
 RX Flow L3/L4 rule may be used.

 Example::

    ethtool -N eth0 flow-type udp4 action 0 loc 32

UDP GSO hardware offload
------------------------

 UDP GSO allows to boost UDP tx rates by offloading UDP headers allocation
 into hardware. A special userspace socket option is required for this,
 could be validated with /kernel/tools/testing/selftests/net/::

    udpgso_bench_tx -u -4 -D 10.0.1.1 -s 6300 -S 100

 Will cause sending out of 100 byte sized UDP packets formed from single
 6300 bytes user buffer.

 UDP GSO is configured by::

    ethtool -K eth0 tx-udp-segmentation on

Private flags (testing)
-----------------------

 Atlantic driver supports private flags for hardware custom features::

	$ ethtool --show-priv-flags ethX

	Private flags for ethX:
	DMASystemLoopback  : off
	PKTSystemLoopback  : off
	DMANetworkLoopback : off
	PHYInternalLoopback: off
	PHYExternalLoopback: off

 Example::

	$ ethtool --set-priv-flags ethX DMASystemLoopback on

 DMASystemLoopback:   DMA Host loopback.
 PKTSystemLoopback:   Packet buffer host loopback.
 DMANetworkLoopback:  Network side loopback on DMA block.
 PHYInternalLoopback: Internal loopback on Phy.
 PHYExternalLoopback: External loopback on Phy (with loopback ethernet cable).


Command Line Parameters
=======================
The following command line parameters are available on atlantic driver:

aq_itr -Interrupt throttling mode
---------------------------------
Accepted values: 0, 1, 0xFFFF

Default value: 0xFFFF

======   ==============================================================
0        Disable interrupt throttling.
1        Enable interrupt throttling and use specified tx and rx rates.
0xFFFF   Auto throttling mode. Driver will choose the best RX and TX
	 interrupt throttling settings based on link speed.
======   ==============================================================

aq_itr_tx - TX interrupt throttle rate
--------------------------------------

Accepted values: 0 - 0x1FF

Default value: 0

TX side throttling in microseconds. Adapter will setup maximum interrupt delay
to this value. Minimum interrupt delay will be a half of this value

aq_itr_rx - RX interrupt throttle rate
--------------------------------------

Accepted values: 0 - 0x1FF

Default value: 0

RX side throttling in microseconds. Adapter will setup maximum interrupt delay
to this value. Minimum interrupt delay will be a half of this value

.. note::

   ITR settings could be changed in runtime by ethtool -c means (see below)

Config file parameters
======================

For some fine tuning and performance optimizations,
some parameters can be changed in the {source_dir}/aq_cfg.h file.

AQ_CFG_RX_PAGEORDER
-------------------

Default value: 0

RX page order override. That's a power of 2 number of RX pages allocated for
each descriptor. Received descriptor size is still limited by
AQ_CFG_RX_FRAME_MAX.

Increasing pageorder makes page reuse better (actual on iommu enabled systems).

AQ_CFG_RX_REFILL_THRES
----------------------

Default value: 32

RX refill threshold. RX path will not refill freed descriptors until the
specified number of free descriptors is observed. Larger values may help
better page reuse but may lead to packet drops as well.

AQ_CFG_VECS_DEF
---------------

Number of queues

Valid Range: 0 - 8 (up to AQ_CFG_VECS_MAX)

Default value: 8

Notice this value will be capped by the number of cores available on the system.

AQ_CFG_IS_RSS_DEF
-----------------

Enable/disable Receive Side Scaling

This feature allows the adapter to distribute receive processing
across multiple CPU-cores and to prevent from overloading a single CPU core.

Valid values

==  ========
0   disabled
1   enabled
==  ========

Default value: 1

AQ_CFG_NUM_RSS_QUEUES_DEF
-------------------------

Number of queues for Receive Side Scaling

Valid Range: 0 - 8 (up to AQ_CFG_VECS_DEF)

Default value: AQ_CFG_VECS_DEF

AQ_CFG_IS_LRO_DEF
-----------------

Enable/disable Large Receive Offload

This offload enables the adapter to coalesce multiple TCP segments and indicate
them as a single coalesced unit to the OS networking subsystem.

The system consumes less energy but it also introduces more latency in packets
processing.

Valid values

==  ========
0   disabled
1   enabled
==  ========

Default value: 1

AQ_CFG_TX_CLEAN_BUDGET
----------------------

Maximum descriptors to cleanup on TX at once.

Default value: 256

After the aq_cfg.h file changed the driver must be rebuilt to take effect.

Support
=======

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 aqn_support@marvell.com

License
=======

aQuantia Corporation Network Driver

Copyright |copy| 2014 - 2019 aQuantia Corporation.

This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
version 2, as published by the Free Software Foundation.