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# Copyright (c) 2021, Dell Inc. or its subsidiaries. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
# See the LICENSE file for details.
#
# This file is part of NVMe STorage Appliance Services (nvme-stas).
# ==============================================================================
# STorage Appliance Connector Daemon (stacd) - configuration file
#
# In this file, options that are commented represent the default values used.
# Uncommented options override the default value.
[Global]
# tron: Trace-ON. Enable additional debug info
# Type: boolean
# Range: [false, true]
#tron=false
# hdr-digest: Protocol Data Unit (PDU) Header Digest. NVMe/TCP facilitates an
# optional PDU Header digest. Digests are calculated using the
# CRC32C algorithm.
# Type: boolean
# Range: [false, true]
#hdr-digest=false
# data-digest: Protocol Data Unit (PDU) Data Digest. NVMe/TCP facilitates an
# optional PDU Data digest. Digests are calculated using the
# CRC32C algorithm.
# Type: boolean
# Range: [false, true]
#data-digest=false
# kato: Keep Alive Timeout (KATO): This field specifies the timeout value
# for the Keep Alive feature in seconds. The default value for this
# field is 120 seconds (2 minutes).
# Type: Unsigned integer
# Range: 0..N
# Unit: Seconds
#kato=120
# nr-io-queues: Overrides the default number of I/O queues create by the
# driver.
# Type: Unsigned integer
# Range: 1..N
# Default: Depends on kernel and other run time
# factors (e.g. number of CPUs).
# nr-write-queues: Adds additional queues that will be used for write I/O.
# Type: Unsigned integer
# Range: 1..N
# Default: Depends on kernel and other run time
# factors (e.g. number of CPUs).
# nr-poll-queues: Adds additional queues that will be used for polling
# latency sensitive I/O.
# Type: Unsigned integer
# Range: 1..N
# Default: Depends on kernel and other run time
# factors (e.g. number of CPUs).
# queue-size: Overrides the default number of elements in the I/O queues
# created by the driver.
# Type: Unsigned integer
# Range: 16..1024
# Default: 128
#queue-size=128
# reconnect-delay: Overrides the default delay, in seconds, before reconnect
# is attempted after a connect loss.
# Type: Unsigned integer
# Range: 1..N
# Unit: Seconds
# Default: 10 (retry to connect every 10 seconds)
#reconnect-delay=10
# ctrl-loss-tmo: Overrides the default controller loss timeout period in
# seconds.
# Type: Unsigned integer
# Range: -1, 0..N where -1 means retry forever
# Unit: Seconds
# Default: 600 (retry to connect for up to 10 minutes)
#ctrl-loss-tmo=600
# disable-sqflow: Disables SQ flow control to omit head doorbell update for
# submission queues when sending nvme completions.
# Type: boolean
# Range: [false, true]
# Default: false
#disable-sqflow=false
# ignore-iface: This option controls whether connections with I/O Controllers
# (IOC) will be forced on a specific interface or will rely on
# the routing tables to determine the interface.
#
# See the man pages for details: man stacd.conf
#
# Type: boolean
# Range: [false, true]
# Default: true
#ignore-iface=false
# ip-family: With this you can specify whether stacd will support IPv4, IPv6,
# or both when connecting to I/O Controllers (IOC).
#
# See the man pages for details: man stacd.conf
#
# Type: String
# Range: [ipv4, ipv6, ipv4+ipv6]
# Default: ipv4+ipv6
#ip-family=ipv4+ipv6
# ==============================================================================
[I/O controller connection management]
# This section contains parameters to manage I/O controller connections.
# For example, parameters are provided to control disconnect policy. In other
# words, whether stacd will disconnect from IOCs on DLPE removal and which
# connections will be affected.
#
# Also, what should stacd do when a DLPE NCC bit (Not Connected to CDC) is
# asserted. Should stacd stop trying to connect to an I/O controller after a
# certain number of unsuccessful attempts.
#
# See the man pages for details: man stacd.conf
# disconnect-scope: Determines which connections, if any, will be the target of
# a potential disconnect on DLPE removal.
#
# Type: String
# Range: [only-stas-connections | all-connections-matching-disconnect-trtypes | no-disconnect]
# Default: only-stas-connections
#disconnect-scope=only-stas-connections
# disconnect-trtypes: Specify which connections should be audited based on the
# transport type. This parameter only applies when
# "disconnect-scope = all-connections-matching-disconnect-trtypes".
#
# Type: String
# Range: [tcp, rdma, fc, tcp+rdma, tcp+fc, rdma+fc, tcp+rdma+fc]
# Default: tcp
#disconnect-trtypes=tcp
# connect-attempts-on-ncc: The NCC bit (Not Connected to CDC) returned in a
# DLPE indicates whether a connection is currently
# established between the CDC and the subsystem listed
# in the DLPE.
#
# When the NCC bit is asserted, it may mean that the
# subsystem is offline or that fabrics connectivity is
# momentarily lost. If the host is also unable to
# connect to the subsystem, then there is no point in
# continuing to try to connect. In fact, the CDC will
# monitor the situation an inform the host (AEN) when
# connectivity is restored.
#
# This field is used to tell stacd how to behave when
# the NCC bit is asserted. How many times should it try
# to connect before give-up, or whether to keep trying
# indefinitely.
#
# Type: Integer
# Range: [0, 2..N], 0 means "Never stop trying". A
# non-0 value indicates the number of attempts
# before giving up. This value should never be
# set to 1. A value of 1 will automatically be
# increased to 2. That's because a single
# failure may be normal and a minimum of 2
# attempts is required to conclude that a
# connection is not possible.
# Default: 0
#connect-attempts-on-ncc=0
# ==============================================================================
[Controllers]
# controller: I/O Controllers (IOC) are specified with this keyword.
#
# Syntax:
# controller = transport=<trtype>;traddr=<traddr>;trsvcid=<trsvcid>;host-traddr=<traddr>;host-iface=<iface>,nqn=<subnqn>
#
# transport=<trtype> [MANDATORY]
# This field specifies the network fabric being used for a NVMe-over-
# Fabrics network. Current string values include:
#
# Value Definition
# ------- -----------------------------------------------------------
# rdma The network fabric is an rdma network (RoCE, iWARP, Infiniband, basic rdma, etc)
# fc The network fabric is a Fibre Channel network.
# tcp The network fabric is a TCP/IP network.
# loop Connect to a NVMe over Fabrics target on the local host
#
# traddr=<traddr> [MANDATORY]
# This field specifies the network address of the Controller. For
# transports using IP addressing (e.g. rdma) this should be an IP-
# based address (ex. IPv4, IPv6). It could also be a resolvable host
# name (e.g. localhost).
#
# nqn=<subnqn> [MANDATORY]
# This field specifies the Subsystem's NVMe Qualified Name.
#
# trsvcid=<trsvcid> [OPTIONAL]
# This field specifies the transport service id. For transports using
# IP addressing (e.g. rdma) this field is the port number.
#
# Depending on the transport type, this field will default to either
# 8009 or 4420 as follows.
#
# UDP port 4420 and TCP port 4420 have been assigned by IANA
# for use by NVMe over Fabrics. NVMe/RoCEv2 controllers use UDP port
# 4420 by default. NVMe/iWARP controllers use TCP port 4420 by
# default.
#
# TCP port 4420 has been assigned for use by NVMe over Fabrics and TCP
# port 8009 has been assigned by IANA for use by NVMe over Fabrics
# discovery. TCP port 8009 is the default TCP port for NVMe/TCP
# discovery controllers. There is no default TCP port for NVMe/TCP I/O
# controllers, the Transport Service Identifier (TRSVCID) field in the
# Discovery Log Entry indicates the TCP port to use.
#
# The TCP ports that may be used for NVMe/TCP I/O controllers include
# TCP port 4420, and the Dynamic and/or Private TCP ports (i.e., ports
# in the TCP port number range from 49152 to 65535). NVMe/TCP I/O
# controllers should not use TCP port 8009. TCP port 4420 shall not be
# used for both NVMe/iWARP and NVMe/TCP at the same IP address on the
# same network.
#
# host-traddr=<traddr> [OPTIONAL]
# This field specifies the network address used on the host to connect
# to the Controller. For TCP, this sets the source address on the
# socket.
#
# host-iface=<iface> [OPTIONAL]
# This field specifies the network interface used on the host to
# connect to the Controller (e.g. IP eth1, enp2s0, enx78e7d1ea46da).
# This forces the connection to be made on a specific interface
# instead of letting the system decide.
#
# dhchap-ctrl-secret [OPTIONAL]
# NVMe In-band authentication controller secret (i.e. key) for
# bi-directional authentication; needs to be in ASCII format as
# specified in NVMe 2.0 section 8.13.5.8 'Secret representation'.
# Bi-directional authentication will be attempted when present.
#
# hdr-digest [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# data-digest [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# nr-io-queues [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# nr-write-queues [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# nr-poll-queues [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# queue-size [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# kato [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# reconnect-delay [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# ctrl-loss-tmo [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# disable-sqflow [OPTIONAL]
# See definition in [Global] section. This is used to override
# the value specified in the [Global] section.
#
# Multiple DCs may be specified on separate lines like this (this is
# just an example and does not represent default values):
#
# controller = transport=tcp;traddr=localhost;nqn=nqn.1988-11.com.dell:PowerSANxxx:01:20210225100113-454f73093ceb4847a7bdfc6e34ae8e28
# controller = transport=tcp;traddr=2001:db8::370:7334;host-iface=enp0s8;nqn=nqn.starship-enterprise
# controller = transport=fc;traddr=nn-0x204600a098cbcac6:pn-0x204700a098cbcac6;nqn=nqn.romulan-empire
# ...
# Type: String
#
# Default: There is no default controller. STAC will not try to
# connect to a default I/O Controller.
#controller=
# exclude: Excluded controllers. This keyword allows configuring I/O
# controllers that should not be connected to (whatever the
# reason may be).
#
# The syntax is the same as for "controller=", except that the key
# host-traddr does not apply. Multiple "exclude=" keywords may
# appear in the config file to define the exclusion list.
#
# Note 1: A minimal match approach is used to eliminate unwanted
# controllers. That is, you do not need to specify all the
# parameters to identify a controller. Just specifying the
# host-iface, for example, can be used to exclude all controllers
# on an interface.
#
# Note 2: "exclude=" takes precedence over "controller=". A
# controller specified by the "controller=" keyword, can be
# eliminated by the "exclude=" keyword.
#
# Syntax: Same as "controller=" above.
# Type: String
#
# Example:
# exclude = transport=tcp;traddr=fe80::2c6e:dee7:857:26bb # Eliminate a specific address
# exclude = host-iface=enp0s8 # Eliminate everything on this interface
#exclude=
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