# https://pve.proxmox.com/wiki/Open_vSwitch ; https://github.com/openvswitch/ovs/blob/main/debian/openvswitch-switch.README.Debian ; https://github.com/openvswitch/ovs/blob/main/debian/openvswitch-switch-dpdk.README.Debian ;

apt update
apt install openvswitch-switch
sudo update-alternatives --set ovs-vswitchd \
     /usr/lib/openvswitch-switch-dpdk/ovs-vswitchd-dpdk
sudo service openvswitch-switch restart

# Install DEPENDENCIES: Fedora 42 RHEL 10, Rocky 10, Almalinux 10
https://docs.openvswitch.org/en/latest/intro/install/general/
https://cloudspinx.com/build-open-vswitch-from-source-on-rocky-almalinux-rhel/
https://micro-grid.github.io/swtch/apt/
_____________________________________________________________________________

# For RHEL 10/Rocky 10, Almalinux 10/Fedora systems these can be installed using dnf groupinstall "Development Tools"
# For Debian systems these can be installed using apt install build-essential

su - root
cd /usr/src/
dnf -y install epel-release
dnf config-manager --set-enabled crb
dnf groupinstall "Development Tools"
dnf install @'Development Tools' rpm-build dnf-plugins-core
dnf -y install gcc make python3-devel openssl-devel \
    kernel-devel kernel-debug-devel rpm-build desktop-file-utils \
    groff-base libcap-ng-devel numactl-devel selinux-policy-devel \
    systemtap-sdt-devel unbound-devel unbound python3-sphinx \
    libbpf-devel libxdp-devel groff network-scripts python-pyelftools \
    pyelftools numactl-devel
dnf install python3-sphinx python3-devel libxdp-devel \
    numactl-devel selinux-policy-devel systemtap-sdt-devel \
    unbound unbound-devel sparse
_____________________________________________________________________________
# Install DPDK vhost-user-client - Download on Fedora 42
https://docs.openvswitch.org/en/latest/topics/dpdk/vhost-user/

su - root
cd /usr/src/
wget https://fast.dpdk.org/rel/dpdk-24.11.2.tar.xz
tar xf dpdk-24.11.2.tar.xz
export DPDK_DIR=/usr/src/dpdk-stable-24.11.2
cd $DPDK_DIR

export DPDK_BUILD=$DPDK_DIR/build
meson build
ninja -C build
ninja -C build install
ldconfig

pkg-config --modversion libdpdk
# ONLY IF NEEDED # export PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig
_____________________________________________________________________________
# Install OVS from Git - Clone Repository: Fedora 42
https://docs.openvswitch.org/en/latest/intro/install/dpdk/
https://docs.openvswitch.org/en/latest/intro/install/general/
https://cloudspinx.com/build-open-vswitch-from-source-on-rocky-almalinux-rhel/

cd ../ovs # or cd /usr/src/ovs
su - root
cd/usr/src
git clone https://github.com/openvswitch/ovs.git # wget https://www.openvswitch.org/releases/openvswitch-$VER.tar.gz
cd ovs
git checkout v3.5.0
./boot.sh
./configure --with-dpdk=static
make
# make rpm-fedora RPMBUILD_OPT="--with dpdk --without check"
echo 'vm.nr_hugepages=2048' > /etc/sysctl.d/hugepages.conf
mount -t hugetlbfs none /dev/hugepages

# PRE-REQ CHECKS
grep -e 'vmx' /proc/cpuinfo
grep -e 'svm' /proc/cpuinfo
lscpu | grep Virtualization
lsmod | grep kvm
grep HugePages_ /proc/meminfo
dmesg | grep -e DMAR -e IOMMU
cat /proc/cmdline | grep iommu=pt
cat /proc/cmdline | grep intel_iommu=on

modprobe vfio-pci
/usr/bin/chmod a+x /dev/vfio
/usr/bin/chmod 0666 /dev/vfio/*
export DPDK_DIR=/usr/src/dpdk-stable-24.11.2
##### CLARIFATION NEEDED #####
$DPDK_DIR/usertools/dpdk-devbind.py --bind=vfio-pci eth1
$DPDK_DIR/usertools/dpdk-devbind.py --status

ovs-vsctl get Open_vSwitch . dpdk_initialized

# SETUP OVS

export PATH=$PATH:/usr/local/share/openvswitch/scripts
export DB_SOCK=/usr/local/var/run/openvswitch/db.sock
##### CLARIFATION NEEDED #####
ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
ovs-ctl --no-ovsdb-server --db-sock="$DB_SOCK" start
# ovs-vsctl --no-wait set Open_vSwitch . \
    other_config:dpdk-socket-mem="2048"
##### END CLARIFATION NEEDED #####

make install

#VALIDATING

ovs-vsctl get Open_vSwitch . dpdk_initialized
ovs-vsctl status
ovs-vswitchd --version
ovs-vsctl show

##### CLARIFATION NEEDED #####
ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
ovs-vsctl add-port br0 myportnameone -- set Interface myportnameone \
    type=dpdk options:dpdk-devargs=0000:06:00.0
ovs-vsctl add-port br0 myportnametwo -- set Interface myportnametwo \
    type=dpdk options:dpdk-devargs=0000:06:00.1

virsh edit VM
virsh list --all # virsh start VM #
_____________________________________________________________________________
##### CLARIFATION NEEDED #####
# Install from Git - Clone Repository: Fedora 42 & Bash, /usr/local/etc/openvswitch /usr/local/var
su - root
cd/usr/src
git clone https://github.com/openvswitch/ovs.git
cd ovs
git checkout v3.5.0
./boot.sh
./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --enable-shared
# ./configure
make rpm-fedora
# make rpm-fedora RPMBUILD_OPT="--with dpdk --without check"

export PATH=$PATH:/usr/local/share/openvswitch/scripts
# sudo ovs-ctl start
sudo -E env "PATH=$PATH" ovs-ctl start
ovs-vsctl show

cd rpm/rpmbuild/RPMS/x86_64
ls -al
_____________________________________________________________________________
##### CLARIFATION NEEDED #####
sudo systemctl enable --now openvswitch
systemctl status openvswitch.service
systemctl status ovs-vswitchd ovsdb-server
ovs-vsctl show
# Kernel Compatibility: Ensure kernel-devel matches your running kernel (uname -r). If mismatched, update the kernel or install the correct kernel-devel package.
# DPDK (Optional): For high-performance setups, install dpdk and dpdk-devel, then add --with-dpdk to ./configure.
# Troubleshooting: Check logs in /var/log/openvswitch/ if services fail to start. Ensure the user has permissions (e.g., sudo usermod -aG openvswitch $USER).
# Source: The tarball is downloaded from openvswitch.org, and the Git repository is at github.com/openvswitch/ovs, tag v3.5.0

