src/vppinfra/cache.h


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/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
  Copyright (c) 2005 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef included_clib_cache_h
#define included_clib_cache_h

#include <vppinfra/error_bootstrap.h>

/*
 * Allow CFLAGS to override the configured / deduced cache line size
 */
#ifndef CLIB_LOG2_CACHE_LINE_BYTES

/* defines CLIB_LOG2_CACHE_LINE_BYTES */
#include <vppinfra/config.h>

/* Default cache line size of 64 bytes. */
#ifndef CLIB_LOG2_CACHE_LINE_BYTES
#define CLIB_LOG2_CACHE_LINE_BYTES 6
#endif

#endif /* CLIB_LOG2_CACHE_LINE_BYTES defined */

#if (CLIB_LOG2_CACHE_LINE_BYTES >= 9)
#error Cache line size 512 bytes or greater
#endif

#define CLIB_CACHE_LINE_BYTES (1 << CLIB_LOG2_CACHE_LINE_BYTES)
#define CLIB_CACHE_LINE_ALIGN_MARK(mark) u8 mark[0] __attribute__((aligned(CLIB_CACHE_LINE_BYTES)))

/* Read/write arguments to __builtin_prefetch. */
#define CLIB_PREFETCH_READ 0
#define CLIB_PREFETCH_LOAD 0	/* alias for read */
#define CLIB_PREFETCH_WRITE 1
#define CLIB_PREFETCH_STORE 1	/* alias for write */

#define _CLIB_PREFETCH(n,size,type)				\
  if ((size) > (n)*CLIB_CACHE_LINE_BYTES)			\
    __builtin_prefetch (_addr + (n)*CLIB_CACHE_LINE_BYTES,	\
			CLIB_PREFETCH_##type,			\
			/* locality */ 3);

#define CLIB_PREFETCH(addr,size,type)		\
do {						\
  void * _addr = (addr);			\
						\
  ASSERT ((size) <= 4*CLIB_CACHE_LINE_BYTES);	\
  _CLIB_PREFETCH (0, size, type);		\
  _CLIB_PREFETCH (1, size, type);		\
  _CLIB_PREFETCH (2, size, type);		\
  _CLIB_PREFETCH (3, size, type);		\
} while (0)

#undef _

#endif /* included_clib_cache_h */


/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -exuo pipefail

# This library defines functions used by multiple entry scripts.
# Deliberately not depending on common.sh to allow standalone usage.
# Keep functions ordered alphabetically, please.

function activate_wrapper () {

    # Acts as wrapper for activate docker topology.
    #
    # Variables read:
    # - ${1} - Node multiplicity of desired testbed.
    # - ${2} - Node flavor string, usually describing the processor.
    # - ${3} - CSIT-SUT-DCR image name and version.

    set -exuo pipefail

    enter_mutex || die
    get_available_interfaces "${1}" "${2}" || die
    start_topology_containers "${3}" || die
    bind_interfaces_to_containers || die
    set_env_variables || die
    print_env_variables || die
    exit_mutex || die
}


function bind_interfaces_to_containers () {

    # Bind linux network interface to container and create symlink for PCI
    # address in container.
    #
    # Variables read:
    # - DCR_UUIDS - Docker Container UUIDs.
    # - DCR_CPIDS - Docker Container PIDs (namespaces).
    # - DUT1_NETDEVS - List of network devices allocated to DUT1 container.
    # - PCI_ADDR - PCI address of network device.
    # - TG_NETDEVS - List of network devices allocated to TG container.
    # Variables set:
    # - NETDEV - Linux network interface.

    set -exuo pipefail

    for NETDEV in "${TG_NETDEVS[@]}"; do
        get_pci_addr || die
        link_target=$(readlink -f /sys/bus/pci/devices/"${PCI_ADDR}") || {
            die "Reading symlink for PCI address failed!"
        }
        cmd="ln -s ${link_target} /sys/bus/pci/devices/${PCI_ADDR}"

        sudo ip link set ${NETDEV} netns ${DCR_CPIDS[tg]} || {
            die "Moving interface to ${DCR_CPIDS[tg]} namespace failed!"
        }
        docker exec "${DCR_UUIDS[tg]}" ${cmd} || {
            die "Linking PCI address in container failed!"
        }
    done
    for NETDEV in "${DUT1_NETDEVS[@]}"; do
        get_pci_addr || die
        link_target=$(readlink -f /sys/bus/pci/devices/"${PCI_ADDR}") || {
            die "Reading symlink for PCI address failed!"
        }
        cmd="ln -s ${link_target} /sys/bus/pci/devices/${PCI_ADDR}"

        sudo ip link set ${NETDEV} netns ${DCR_CPIDS[dut1]} || {
            die "Moving interface to ${DCR_CPIDS[dut1]} namespace failed!"
        }
        docker exec "${DCR_UUIDS[dut1]}" ${cmd} ||  {
            die "Linking PCI address in container failed!"
        }
    done
}


function bind_interfaces_to_driver () {

    # Bind network interface specified by parameter to driver specified by
    # parameter.
    #
    # Variables read:
    # - ADDR - PCI address of network interface.
    # - DRIVER - Kernel driver.

    set -exuo pipefail

    pci_path="/sys/bus/pci/devices/${ADDR}"
    drv_path="/sys/bus/pci/drivers/${DRIVER}"
    vd=$(cat ${pci_path}/vendor ${pci_path}/device) || {
        die "Failed to retrieve interface details!"
    }
    set +e
    echo ${vd} | sudo tee ${drv_path}/new_id
    set -e
    echo ${ADDR} | sudo tee ${pci_path}/driver/unbind || {
        die "Failed to unbind interface ${ADDR}!"
    }
    echo ${ADDR} | sudo tee ${drv_path}/bind || {
        die "Failed to bind interface ${ADDR}!"
    }
}


function clean_environment () {

    # Cleanup environment by removing topology containers and shared volumes
    # and binding interfaces back to original driver.
    #
    # Variables read:
    # - DCR_UUIDS - Docker Container UUIDs.
    # - DUT1_PCIDEVS - List of PCI addresses of devices of DUT1 container.
    # - TG_PCIDEVS - List of PCI addresses of devices of TG container.
    # Variables set:
    # - ADDR - PCI address of network interface.
    # - DRIVER - Kernel driver.

    set -exuo pipefail

    # Kill docker containers.
    docker rm --force "${DCR_UUIDS[@]}" || die "Cleanup containers failed!"

    # Check if there are some leftover containers and remove all. Command will
    # not fail in case there are no containers to remove.
    docker rm --force $(docker ps -q --filter name=${DCR_UUIDS[dut1]}) || {
        warn "Failed to remove hanged containers or nothing to remove!"
    }

    # Rebind interfaces back to kernel drivers.
    for ADDR in ${TG_PCIDEVS[@]}; do
        DRIVER="${TG_DRIVERS[0]}"
        bind_interfaces_to_driver || die
    done
    for ADDR in ${DUT1_PCIDEVS[@]}; do
        DRIVER="${DUT1_DRIVERS[0]}"
        bind_interfaces_to_driver || die
    done
}


function clean_environment_on_exit () {

    # Cleanup environment by removing topology containers and binding
    # interfaces back to original driver only if exit code is not 0.
    # This function acts as workaround as 'set -eu' does not trigger ERR trap.

    set -exuo pipefail

    if [ $? -ne 0 ]; then
        clean_environment || die
    fi
}


function deactivate_wrapper () {

    # Acts as wrapper for deactivate docker topology.
    #
    # Variables read:
    # - ${@} - CSIT environment variables.

    set -exuo pipefail

    enter_mutex || die
    read_env_variables "${@}" || die
    clean_environment || die
    exit_mutex || die
}


function die () {

    # Print the message to standard error end exit with error code specified
    # by the second argument.
    #
    # Duplicate of common.sh function, as this file is also used standalone.
    #
    # Hardcoded values:
    # - The default error message.
    # Arguments:
    # - ${1} - The whole error message, be sure to quote. Optional
    # - ${2} - the code to exit with, default: 1.

    set -x
    set +eu
    warn "${1:-Unspecified run-time error occurred!}"
    exit "${2:-1}"
}


function enter_mutex () {

    # Enter mutual exclusion for protecting execution from starvation and
    # deadlock.

    set -exuo pipefail

    mutex_timeout=3600
    mutex_file="/tmp/mutex_file"

    # Create mutex.
    exec {lock_fd}>${mutex_file} || {
        die "Mutex enter failed!"
    }
    flock --timeout "${mutex_timeout}" "${lock_fd}" || {
        die "Calling flock() failed!"
    }
    # ----------------------
    # Enter mutex succeeded.
    warn "Mutex enter succeeded for PID $$."
}


function exit_mutex () {

    # Exit mutual exclusion.

    set -exuo pipefail

    # ---------------------
    # Remove mutex so we are not blocking others anymore.
    flock -u "${lock_fd}" || {
        die "Mutex destroy failed!"
    }
    warn "Mutex leave succeeded for PID $$."
}


function get_available_interfaces () {

    # Find and get available Virtual functions.
    #
    # Arguments:
    # - ${1} - Nodeness, as set by common.sh get_test_code.
    # - ${2} - Flavor, as set by common.sh get_test_code.
    # Variables set:
    # - DUT1_NETDEVS - List of network devices allocated to DUT1 container.
    # - DUT1_PCIDEVS - List of PCI addresses allocated to DUT1 container.
    # - DUT1_NETMACS - List of MAC addresses allocated to DUT1 container.
    # - DUT1_DRIVERS - List of interface drivers to DUT1 container.
    # - TG_NETDEVS - List of network devices allocated to TG container.
    # - TG_PCIDEVS - List of PCI addresses allocated to TG container.
    # - TG_NETMACS - List of MAC addresses allocated to TG container.
    # - TG_DRIVERS - List of interface drivers to TG container.

    set -exuo pipefail

    # Following code is specifing VFs ID based on nodeness and flavor.
    # As there is great variability in hardware configuration outside LF,
    # from bootstrap architecure point of view these are considered as flavors.
    # Anyone can override flavor for its own machine and add condition here.
    # See http://pci-ids.ucw.cz/v2.2/pci.ids for more info.
    case_text="${1}_${2}"
    case "${case_text}" in
        "1n_skx")
            # Add Intel Corporation XL710/X710 Virtual Function to the
            # whitelist.
            pci_id="0x154c"
            tg_netdev=(enp24)
            dut1_netdev=(enp59)
            ;;
       "1n_tx2")
            # Add Intel Corporation XL710/X710 Virtual Function to the
            # whitelist.
            pci_id="0x154c"
            tg_netdev=(enp5s2 enp5s3 enp5s4 enp5s5
                       enp5s6 enp5s7 enp5s8 enp5s9)
            tg_netdev+=(enp8s2 enp8s3 enp8s4 enp8s5
                        enp8s6 enp8s7 enp8s8 enp8s9)
            tg_netdev+=(enp8s10 enp8s11 enp8s12 enp8s13
                        enp8s14 enp8s15 enp8s16 enp8s17)
            dut1_netdev=(enp133s2 enp133s3 enp133s4 enp133s5
                         enp133s6 enp133s7 enp133s8 enp133s9)
            dut1_netdev+=(enp133s10 enp133s11 enp133s12 enp133s13
                          enp133s14 enp133s15 enp133s16 enp133s17)
            dut1_netdev+=(enp5s10 enp5s11 enp5s12 enp5s13
                          enp5s14 enp5s15 enp5s16 enp5s17)
            ;;
       "1n_vbox")
            # Add Intel Corporation 82545EM Gigabit Ethernet Controller to the
            # whitelist.
            pci_id="0x100f"
            tg_netdev=(enpTGa enpTGb)
            dut1_netdev=(enpSUTa enpSUTb)
            ;;
        *)
            die "Unknown specification: ${case_text}!"
    esac

    device_count=2

    # TG side of connections.
    TG_NETDEVS=()
    TG_PCIDEVS=()
    TG_NETMACS=()
    TG_DRIVERS=()
    # DUT1 side of connections.
    DUT1_NETDEVS=()
    DUT1_PCIDEVS=()
    DUT1_NETMACS=()
    DUT1_DRIVERS=()

    # Find the first ${device_count} number of available TG Linux network
    # VF device names. Only allowed VF PCI IDs are filtered.
    for netdev in ${tg_netdev[@]}
    do
        for netdev_path in $(grep -l "${pci_id}" \
                             /sys/class/net/${netdev}*/device/device \
                             2> /dev/null)
        do
            if [[ ${#TG_NETDEVS[@]} -lt ${device_count} ]]; then
                tg_netdev_name=$(dirname ${netdev_path})
                tg_netdev_name=$(dirname ${tg_netdev_name})
                TG_NETDEVS+=($(basename ${tg_netdev_name}))
            else
                break
            fi
        done
        if [[ ${#TG_NETDEVS[@]} -eq ${device_count} ]]; then
            break
        fi
    done

    i=0
    for netdev in "${TG_NETDEVS[@]}"; do
        # Find the index of selected tg netdev among tg_netdevs
        # e.g. enp8s5f7 is a vf of netdev enp8s5 with index 11
        # and the corresponding dut1 netdev is enp133s13.
        while [[ "${netdev}" != "${tg_netdev[$i]}"* ]]; do
            ((i++))
        done
        # Rename tg netdev to dut1 netdev
        # e.g. enp8s5f7 -> enp133s13f7
        DUT1_NETDEVS+=(${netdev/${tg_netdev[$i]}/${dut1_netdev[$i]}})
        # Don't need to reset i, all netdevs are sorted.
    done

    for NETDEV in "${TG_NETDEVS[@]}"; do
        get_pci_addr
        get_mac_addr
        get_krn_driver
        TG_PCIDEVS+=(${PCI_ADDR})
        TG_NETMACS+=(${MAC_ADDR})
        TG_DRIVERS+=(${KRN_DRIVER})
    done
    for NETDEV in "${DUT1_NETDEVS[@]}"; do
        get_pci_addr
        get_mac_addr
        get_krn_driver
        DUT1_PCIDEVS+=(${PCI_ADDR})
        DUT1_NETMACS+=(${MAC_ADDR})
        DUT1_DRIVERS+=(${KRN_DRIVER})
    done

    # We need at least two interfaces for TG/DUT1 for building topology.
    if [ "${#TG_NETDEVS[@]}" -ne 2 ] || [ "${#DUT1_NETDEVS[@]}" -ne 2 ]; then
        die "Not enough linux network interfaces found!"
    fi
    if [ "${#TG_PCIDEVS[@]}" -ne 2 ] || [ "${#DUT1_PCIDEVS[@]}" -ne 2 ]; then
        die "Not enough pci interfaces found!"
    fi
}


function get_krn_driver () {

    # Get kernel driver from linux network device name.
    #
    # Variables read:
    # - PCI_ADDR - PCI address of network device.
    # Variables set:
    # - KRN_DRIVER - Kernel driver of network device.

    set -exuo pipefail

    pci_path="/sys/bus/pci/devices/${PCI_ADDR}"
    KRN_DRIVER="$(basename $(readlink -f ${pci_path}/driver))" || {
        die "Failed to get kernel driver of PCI interface!"
    }
}


function get_mac_addr () {

    # Get MAC address from linux network device name.
    #
    # Variables read:
    # - NETDEV - Linux network device name.
    # Variables set:
    # - MAC_ADDR - MAC address of network device.

    set -exuo pipefail

    if [ -d /sys/class/net/${NETDEV}/device ]; then
        MAC_ADDR="$(</sys/class/net/${NETDEV}/address)" || {
            die "Failed to get MAC address of linux network interface!"
        }
    fi
}


function get_pci_addr () {

    # Get PCI address in <domain>:<bus:<device>.<func> format from linux network
    # device name.
    #
    # Variables read:
    # - NETDEV - Linux network device name.
    # Variables set:
    # - PCI_ADDR - PCI address of network device.

    set -exuo pipefail

    if [ -d /sys/class/net/${NETDEV}/device ]; then
        PCI_ADDR=$(basename $(readlink /sys/class/net/${NETDEV}/device)) || {
            die "Failed to get PCI address of linux network interface!"
        }
    fi
    if [ ! -d /sys/bus/pci/devices/${PCI_ADDR} ]; then
        die "PCI device ${NETDEV} doesn't exist!"
    fi
}


function installed () {

    # Check if the given utility is installed. Fail if not installed.
    #
    # Duplicate of common.sh function, as this file is also used standalone.
    #
    # Arguments:
    # - ${1} - Utility to check.
    # Returns:
    # - 0 - If command is installed.
    # - 1 - If command is not installed.

    set -exuo pipefail

    command -v "${1}"
}


function print_env_variables () {

    # Get environment variables prefixed by CSIT_.

    set -exuo pipefail

    env | grep CSIT_ || true
}


function read_env_variables () {

    # Read environment variables from parameters.
    #
    # Arguments:
    # - ${@} - Variables passed as an argument.
    # Variables read, set or exported: Multiple,
    # see the code for the current list.
    # TODO: Do we need to list them and their meanings?

    set -exuo pipefail

    for param in "$@"; do
        export "${param}"
    done
    declare -gA DCR_UUIDS
    DCR_UUIDS+=([tg]="${CSIT_TG_UUID}")
    DCR_UUIDS+=([dut1]="${CSIT_DUT1_UUID}")
    TG_PCIDEVS=("${CSIT_TG_INTERFACES_PORT1_PCI}")
    TG_DRIVERS=("${CSIT_TG_INTERFACES_PORT1_DRV}")
    TG_PCIDEVS+=("${CSIT_TG_INTERFACES_PORT2_PCI}")
    TG_DRIVERS+=("${CSIT_TG_INTERFACES_PORT2_DRV}")
    DUT1_PCIDEVS=("${CSIT_DUT1_INTERFACES_PORT1_PCI}")
    DUT1_DRIVERS=("${CSIT_DUT1_INTERFACES_PORT1_DRV}")
    DUT1_PCIDEVS+=("${CSIT_DUT1_INTERFACES_PORT2_PCI}")
    DUT1_DRIVERS+=("${CSIT_DUT1_INTERFACES_PORT2_DRV}")
}


function set_env_variables () {

    # Set environment variables.
    #
    # Variables read:
    # - DCR_UUIDS - Docker Container UUIDs.
    # - DCR_PORTS - Docker Container's SSH ports.
    # - DUT1_NETMACS - List of network devices MAC addresses of DUT1 container.
    # - DUT1_PCIDEVS - List of PCI addresses of devices of DUT1 container.
    # - DUT1_DRIVERS - List of interface drivers to DUT1 container.
    # - TG_NETMACS - List of network devices MAC addresses of TG container.
    # - TG_PCIDEVS - List of PCI addresses of devices of TG container.
    # - TG_DRIVERS - List of interface drivers to TG container.
    # Variables set: TODO.

    set -exuo pipefail

    set -a
    CSIT_TG_HOST="$(hostname --all-ip-addresses | awk '{print $1}')" || {
        die "Reading hostname IP address failed!"
    }
    CSIT_TG_PORT="${DCR_PORTS[tg]#*:}"
    CSIT_TG_UUID="${DCR_UUIDS[tg]}"
    CSIT_TG_ARCH="$(uname -i)" || {
        die "Reading machine architecture failed!"
    }
    CSIT_DUT1_HOST="$(hostname --all-ip-addresses | awk '{print $1}')" || {
        die "Reading hostname IP address failed!"
    }
    CSIT_DUT1_PORT="${DCR_PORTS[dut1]#*:}"
    CSIT_DUT1_UUID="${DCR_UUIDS[dut1]}"
    CSIT_DUT1_ARCH="$(uname -i)" || {
        die "Reading machine architecture failed!"
    }
    CSIT_TG_INTERFACES_PORT1_MAC="${TG_NETMACS[0]}"
    CSIT_TG_INTERFACES_PORT1_PCI="${TG_PCIDEVS[0]}"
    CSIT_TG_INTERFACES_PORT1_DRV="${TG_DRIVERS[0]}"
    CSIT_TG_INTERFACES_PORT2_MAC="${TG_NETMACS[1]}"
    CSIT_TG_INTERFACES_PORT2_PCI="${TG_PCIDEVS[1]}"
    CSIT_TG_INTERFACES_PORT2_DRV="${TG_DRIVERS[1]}"
    CSIT_DUT1_INTERFACES_PORT1_MAC="${DUT1_NETMACS[0]}"
    CSIT_DUT1_INTERFACES_PORT1_PCI="${DUT1_PCIDEVS[0]}"
    CSIT_DUT1_INTERFACES_PORT1_DRV="${DUT1_DRIVERS[0]}"
    CSIT_DUT1_INTERFACES_PORT2_MAC="${DUT1_NETMACS[1]}"
    CSIT_DUT1_INTERFACES_PORT2_PCI="${DUT1_PCIDEVS[1]}"
    CSIT_DUT1_INTERFACES_PORT2_DRV="${DUT1_DRIVERS[1]}"
    set +a
}


function start_topology_containers () {

    # Starts csit-sut-dcr docker containers for TG/DUT1.
    #
    # Variables read:
    # - CSIT_DIR - Path to existing root of local CSIT git repository.
    # Variables set:
    # - DCR_UUIDS - Docker Container UUIDs.
    # - DCR_PORTS - Docker Container SSH TCP ports.
    # - DCR_CPIDS - Docker Container PIDs (namespaces).

    set -exuo pipefail

    if ! installed docker; then
        die "Docker not present. Please install before continue!"
    fi

    # If the IMAGE is not already loaded then docker run will pull the IMAGE,
    # and all image dependencies, before it starts the container.
    dcr_image="${1}"
    # Run the container in the background and print the new container ID.
    dcr_stc_params="--detach=true "
    # Give extended privileges to this container. A "privileged" container is
    # given access to all devices and able to run nested containers.
    dcr_stc_params+="--privileged "
    # Publish all exposed ports to random ports on the host interfaces.
    dcr_stc_params+="--publish-all "
    # Automatically remove the container when it exits.
    dcr_stc_params+="--rm "
    # Size of /dev/shm.
    dcr_stc_params+="--shm-size 512M "
    # Override access to PCI bus by attaching a filesystem mount to the
    # container.
    dcr_stc_params+="--mount type=tmpfs,destination=/sys/bus/pci/devices "
    # Mount vfio to be able to bind to see binded interfaces. We cannot use
    # --device=/dev/vfio as this does not see newly binded interfaces.
    dcr_stc_params+="--volume /dev/vfio:/dev/vfio "
    # Mount nested_vm image to be able to run VM tests.
    dcr_stc_params+="--volume /var/lib/vm/vhost-nested.img:/var/lib/vm/vhost-nested.img "
    # Mount docker.sock to be able to use docker deamon of the host.
    dcr_stc_params+="--volume /var/run/docker.sock:/var/run/docker.sock "

    # Docker Container UUIDs.
    declare -gA DCR_UUIDS
    # Docker Container SSH TCP ports.
    declare -gA DCR_PORTS
    # Docker Container PIDs (namespaces).
    declare -gA DCR_CPIDS

    # Run TG and DUT1. As initial version we do support only 2-node.
    params=(${dcr_stc_params} --name csit-tg-$(uuidgen) ${dcr_image})
    DCR_UUIDS+=([tg]=$(docker run "${params[@]}")) || {
        die "Failed to start TG docker container!"
    }
    params=(${dcr_stc_params} --name csit-dut1-$(uuidgen) ${dcr_image})
    DCR_UUIDS+=([dut1]=$(docker run "${params[@]}")) || {
        die "Failed to start DUT1 docker container!"
    }

    trap 'clean_environment_on_exit' EXIT || {
        die "Trap attempt failed, please cleanup manually. Aborting!"
    }

    # Get Containers TCP ports.
    params=(${DCR_UUIDS[tg]})
    DCR_PORTS+=([tg]=$(docker port "${params[@]}")) || {
        die "Failed to get port of TG docker container!"
    }
    params=(${DCR_UUIDS[dut1]})
    DCR_PORTS+=([dut1]=$(docker port "${params[@]}")) || {
        die "Failed to get port of DUT1 docker container!"
    }

    # Get Containers PIDs.
    params=(--format="{{ .State.Pid }}" ${DCR_UUIDS[tg]})
    DCR_CPIDS+=([tg]=$(docker inspect "${params[@]}")) || {
        die "Failed to get PID of TG docker container!"
    }
    params=(--format="{{ .State.Pid }}" ${DCR_UUIDS[dut1]})
    DCR_CPIDS+=([dut1]=$(docker inspect "${params[@]}")) || {
        die "Failed to get PID of DUT1 docker container!"
    }
}

function warn () {
    # Print the message to standard error.
    #
    # Duplicate of common.sh function, as this file is also used standalone.
    #
    # Arguments:
    # - ${@} - The text of the message.

    set -exuo pipefail

    echo "$@" >&2
}