Adding upstream version 2.2.1.upstream/2.2.1

Signed-off-by: Benjamin Drung <bdrung@debian.org>

6 files changed, 758 insertions, 0 deletions

diff --git a/etc/dbus-1/system.d/meson.build b/etc/dbus-1/system.d/meson.build
new file mode 100644
index 0000000..b9bc858
--- /dev/null
+++ b/etc/dbus-1/system.d/meson.build
@@ -0,0 +1,23 @@
+# 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).
+#
+# Authors: Martin Belanger <Martin.Belanger@dell.com>
+#
+dbus_conf_dir = datadir / 'dbus-1' / 'system.d'
+
+configure_file(
+    input: 'org.nvmexpress.staf.in.conf',
+    output: 'org.nvmexpress.staf.conf',
+    configuration: conf,
+    install_dir: dbus_conf_dir,
+)
+
+configure_file(
+    input: 'org.nvmexpress.stac.in.conf',
+    output: 'org.nvmexpress.stac.conf',
+    configuration: conf,
+    install_dir: dbus_conf_dir,
+)
diff --git a/etc/dbus-1/system.d/org.nvmexpress.stac.in.conf b/etc/dbus-1/system.d/org.nvmexpress.stac.in.conf
new file mode 100644
index 0000000..56b4228
--- /dev/null
+++ b/etc/dbus-1/system.d/org.nvmexpress.stac.in.conf
@@ -0,0 +1,37 @@
+<!--
+ 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).
+
+ Authors: Martin Belanger <Martin.Belanger@dell.com>
+-->
+
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+
+  <!-- Only allow root to own the bus. -->
+  <policy user="root">
+    <allow own_prefix="@STACD_DBUS_NAME@"/>
+  </policy>
+
+  <!-- Allow anyone to invoke most methods on the bus, but deny setting properties. -->
+  <policy context="default">
+    <allow send_destination="@STACD_DBUS_NAME@"/>
+
+    <deny send_destination="@STACD_DBUS_NAME@"
+        send_interface="org.freedesktop.DBus.Properties"
+        send_member="Set"
+        send_type="method_call"/>
+  </policy>
+
+  <!-- Allow root to invoke everything on the bus. -->
+  <policy user="root">
+    <allow send_destination="@STACD_DBUS_NAME@"/>
+  </policy>
+
+</busconfig>
+
diff --git a/etc/dbus-1/system.d/org.nvmexpress.staf.in.conf b/etc/dbus-1/system.d/org.nvmexpress.staf.in.conf
new file mode 100644
index 0000000..a04877a
--- /dev/null
+++ b/etc/dbus-1/system.d/org.nvmexpress.staf.in.conf
@@ -0,0 +1,37 @@
+<!--
+ 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).
+
+ Authors: Martin Belanger <Martin.Belanger@dell.com>
+-->
+
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+
+  <!-- Only allow root to own the bus. -->
+  <policy user="root">
+    <allow own_prefix="@STAFD_DBUS_NAME@"/>
+  </policy>
+
+  <!-- Allow anyone to invoke most methods on the bus, but deny setting properties. -->
+  <policy context="default">
+    <allow send_destination="@STAFD_DBUS_NAME@"/>
+
+    <deny send_destination="@STAFD_DBUS_NAME@"
+        send_interface="org.freedesktop.DBus.Properties"
+        send_member="Set"
+        send_type="method_call"/>
+  </policy>
+
+  <!-- Allow root to invoke everything on the bus. -->
+  <policy user="root">
+    <allow send_destination="@STAFD_DBUS_NAME@"/>
+  </policy>
+
+</busconfig>
+
diff --git a/etc/stas/stacd.conf b/etc/stas/stacd.conf
new file mode 100644
index 0000000..d03f0b1
--- /dev/null
+++ b/etc/stas/stacd.conf
@@ -0,0 +1,322 @@
+# 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 30 seconds (2 minutes).
+#              Type:  Unsigned integer
+#              Range: 0..N
+#              Unit:  Seconds
+#kato=30
+
+# 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 mimimum 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=
diff --git a/etc/stas/stafd.conf b/etc/stas/stafd.conf
new file mode 100644
index 0000000..22b3f96
--- /dev/null
+++ b/etc/stas/stafd.conf
@@ -0,0 +1,277 @@
+# 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 Finder Daemon (stafd) - 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 30 seconds.
+#              Type:  Unsigned integer
+#              Range: 0..N
+#              Unit:  Seconds
+#kato=30
+
+# 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 Discovery
+#               Controllers (DC) 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 stafd.conf
+#
+#               Type:    boolean
+#               Range:   [false, true]
+#               Default: true
+#ignore-iface=false
+
+# ip-family: With this you can specify whether stafd will support IPv4, IPv6,
+#            or both when connecting to Discovery Controllers (DC).
+#
+#            See the man pages for details: man stafd.conf
+#
+#            Type:    String
+#            Range:   [ipv4, ipv6, ipv4+ipv6]
+#            Default: ipv4+ipv6
+#ip-family=ipv4+ipv6
+
+# pleo: Port Local Entries Only. If enabled and supported, when connected to a
+#       Direct Discovery Controller (DDC), stafd will ask the DDC to return
+#       records for only NVM subsystem ports that are presented through the same
+#       NVM subsystem port that received the Get Log Page command. When disabled
+#       or not supported by the DDC, the DDC may return NVM subsystems that are
+#       not even reachable by the host, including those using a transport
+#       different from the transport used for the Get Log Page command (e.g. Get
+#       Log Page using TCP and receiving FC subsystems). This configuration
+#       parameter has no effect if the DDC does not support PLEO (see PLEOS).
+#
+#       Type:    String
+#       Range:   [disabled, enabled]
+#       Default: enabled
+#pleo=enabled
+
+# ==============================================================================
+[Service Discovery]
+# zeroconf: Control whether DNS-SD/mDNS automatic discovery is enabled. This is
+#           used to enable or disable automatic discovery of Discovery
+#           Controllers using DNS-SD/mDNS.
+#
+#           Type:    String
+#           Range:   [disabled, enabled]
+#           Default: enabled
+#zeroconf=enabled
+
+# ==============================================================================
+[Discovery controller connection management]
+# persistent-connections: Whether connections to Discovery Controllers (DC)
+#                         are persistent. If stafd is stopped, the connections
+#                         will persists. When this is set to false, stafd will
+#                         disconnect from all DCs it is connected to when stafd
+#                         is stopped.
+#                         Type:  boolean
+#                         Range: [false, true]
+#persistent-connections=true
+
+# zeroconf-connections-persistence: DCs that are discovered with mDNS service
+#                                   discovery which are later lost (i.e. no mDNS
+#                                   and TCP connection fails), will be purged from
+#                                   the configuration after this amount of time.
+#                                   Type:  Time specs.
+#                                   Unit:  Takes a unit-less value in seconds,
+#                                          or a time span (TS) value such as
+#                                          "3 days 5 hours".
+#                                   Range: -1, 0, TS.
+#                                          With "-1" equal to "no timeout" and
+#                                          0 equal to timeout immediately.
+#                                   Default: 72 hours (3 days)
+#zeroconf-connections-persistence=72hours
+
+# ==============================================================================
+[Controllers]
+# controller: Discovery Controllers (DC) are specified with this keyword.
+#
+#             Syntax:
+#               controller = transport=[trtype];traddr=[traddr];trsvcid=[trsvcid];host-traddr=[traddr];host-iface=[iface];nqn=<dcnqn>
+#
+#             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=<dcnqn>          [OPTIONAL]
+#               This field specifies the Discovery Controller's NVMe Qualified
+#               Name. If not specified, this will default to the well-known DC
+#               NQN: "nqn.2014-08.org.nvmexpress.discovery".
+#
+#             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.
+#
+#               Ref: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=nvme
+#
+#             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.
+#
+#             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.
+#
+#             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;trsvcid=8009
+#             controller = transport=tcp;traddr=2001:db8::370:7334;host-iface=enp0s8
+#             controller = transport=fc;traddr=nn-0x204600a098cbcac6:pn-0x204700a098cbcac6
+#                 ...
+#
+#             Type: String
+#
+#             Default: There is no default controller. STAF will not try to
+#                      connect to a default Discovery Controller.
+#controller=
+
+
+# exclude: Excluded controllers. Using mDNS to automatically detect
+#          and connect controllers, can result in unintentional connections
+#          being made. This keyword allows configuring the 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=
diff --git a/etc/stas/sys.conf.doc b/etc/stas/sys.conf.doc
new file mode 100644
index 0000000..5850028
--- /dev/null
+++ b/etc/stas/sys.conf.doc
@@ -0,0 +1,62 @@
+# Copyright (c) 2022, 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 Services (stas) - System configuration file
+#
+# In this file, options that are commented represent the default values used.
+# Uncommented options override the default value.
+
+
+[Host]
+# nqn:     The host's unique Non-Qualified Name. A value starting with "file://"
+#          indicates that the Host NQN can be retrieved from a separate file.
+#          Typically, nvme-cli saves the Host NQN in /etc/nvme/hostnqn. For
+#          compatibility with nvme-cli, nvme-stas defaults to looking for the
+#          existance of this file and will read the NQN from it. Otherwise, you
+#          can overwrite the default NQN by specifying its value here or
+#          specifying another file that contains the Host NQN to use.
+#          Type: string
+#          Default: file:///etc/nvme/hostnqn
+#nqn=file:///etc/nvme/hostnqn
+
+
+# id:      The host's unique Identifier (ID). A value starting with "file://"
+#          indicates that the Host ID can be retrieved from a separate file.
+#          Typically, nvme-cli saves the Host ID in /etc/nvme/hostid. For
+#          compatibility with nvme-cli, nvme-stas defaults to looking for the
+#          existance of this file and will read the ID from it. Otherwise, you
+#          can overwrite the default ID by specifying its value here or
+#          specifying another file that contains the Host ID to use.
+#          Type: string
+#          Default: file:///etc/nvme/hostid
+#id=file:///etc/nvme/hostid
+
+
+# key:     The host's DHCHAP key to be used for authentication. This is an
+#          optional parameter only required when authentication is needed.
+#          A value starting with "file://" indicates that the Host Key can
+#          be retrieved from a separate file. Typically, nvme-cli saves the
+#          Host Key in /etc/nvme/hostkey. For compatibility with nvme-cli,
+#          nvme-stas defaults to looking for the existance of this file and
+#          will read the Key from it. Otherwise, you can overwrite the default
+#          Key by specifying its value here or specifying another file that
+#          contains an alternate Host Key to use.
+#          Type: string
+#          Default: file:///etc/nvme/hostkey
+#key=file:///etc/nvme/hostkey
+
+
+# symname: The host's symbolic name. This can be a string or the name of a file
+#          containing the symbolic name. A value starting with "file://"
+#          indicates that the Symbolic Name can be retrieved from a separate
+#          file.
+#          Type: string
+#          Default: There is no default. The symbolic name is undefined by
+#                   default.
+#symname=
+
+