Revert "Kernel: T2843: upgrade Kernel to v5.8.5"

This reverts commit 78c43c2078e292ac9b53d2d6a41a47466d283914.

Unfortunately we must revert the Kernel upgrade as there are two problematic
issues. One which is the break of ABI functionality with parted [1] and second
the internal cryptop API [2] which removed required literals for the build of
Intel QAT acceleration.

In the two weeks running 5.8 we still learned a lot - we experienced a
performance improvement of ~30% when doing NAT @ > 10GBit/s and also utilizing
the build in updated drivers for Intel NICs and WireGuard.

We are looking forward to the release of this years LTS kernel and we hope to
ship this in the final 1.3 release.

1: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.8.y&id=692d062655
2: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.5.y&id=d63007eb95

1 files changed, 93 insertions, 0 deletions

diff --git a/packages/linux-kernel/build-intel-drivers.sh b/packages/linux-kernel/build-intel-drivers.sh
new file mode 100755
index 00000000..bffd7354
--- /dev/null
+++ b/packages/linux-kernel/build-intel-drivers.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+CWD=$(pwd)
+KERNEL_VAR_FILE=${CWD}/kernel-vars
+
+if [ ! -f ${KERNEL_VAR_FILE} ]; then
+    echo "Kernel variable file '${KERNEL_VAR_FILE}' does not exist, run ./build_kernel.sh first"
+    exit 1
+fi
+
+. ${KERNEL_VAR_FILE}
+
+declare -a intel=(
+    "http://dev.packages.vyos.net/source-mirror/ixgbe-5.8.1.tar.gz"
+    "http://dev.packages.vyos.net/source-mirror/ixgbevf-4.8.1.tar.gz"
+    "http://dev.packages.vyos.net/source-mirror/igb-5.3.6.tar.gz"
+    "http://dev.packages.vyos.net/source-mirror/i40e-2.12.6.tar.gz"
+    "http://dev.packages.vyos.net/source-mirror/iavf-4.0.1.tar.gz"
+)
+
+for url in "${intel[@]}"
+do
+    cd ${CWD}
+
+    DRIVER_FILE="$(basename ${url})"
+    DRIVER_DIR="${DRIVER_FILE%.tar.gz}"
+    DRIVER_NAME="${DRIVER_DIR%-*}"
+    DRIVER_VERSION="${DRIVER_DIR##*-}"
+    DRIVER_VERSION_EXTRA="-0"
+
+    # Build up Debian related variables required for packaging
+    DEBIAN_ARCH=$(dpkg --print-architecture)
+    DEBIAN_DIR="${CWD}/vyos-intel-${DRIVER_NAME}_${DRIVER_VERSION}${DRIVER_VERSION_EXTRA}_${DEBIAN_ARCH}"
+    DEBIAN_CONTROL="${DEBIAN_DIR}/DEBIAN/control"
+    DEBIAN_POSTINST="${CWD}/vyos-intel-driver.postinst"
+
+    # Fetch Intel driver source from SourceForge
+    if [ -e ${DRIVER_FILE} ]; then
+        rm -f ${DRIVER_FILE}
+    fi
+    curl -L -o ${DRIVER_FILE} ${url}
+    if [ "$?" -ne "0" ]; then
+        exit 1
+    fi
+
+    # Unpack archive
+    if [ -d ${DRIVER_DIR} ]; then
+        rm -rf ${DRIVER_DIR}
+    fi
+    tar xf ${DRIVER_FILE}
+
+    cd ${DRIVER_DIR}/src
+    if [ -z $KERNEL_DIR ]; then
+        echo "KERNEL_DIR not defined"
+        exit 1
+    fi
+    echo "I: Compile Kernel module for Intel ${DRIVER_NAME} driver"
+    KSRC=${KERNEL_DIR} \
+        INSTALL_MOD_PATH=${DEBIAN_DIR} \
+        make -j $(getconf _NPROCESSORS_ONLN) install
+
+    # delete non required files which are also present in the kernel package
+    # und thus lead to duplicated files
+    find ${DEBIAN_DIR} -name "modules.*" | xargs rm -f
+
+    echo "#!/bin/sh" > ${DEBIAN_POSTINST}
+    echo "/sbin/depmod -a ${KERNEL_VERSION}${KERNEL_SUFFIX}" >> ${DEBIAN_POSTINST}
+
+    # build Debian package
+    echo "I: Building Debian package vyos-intel-${DRIVER_NAME}"
+    cd ${CWD}
+    if [ -f ${DEBIAN_DIR}.deb ]; then
+        rm ${DEBIAN_DIR}.deb
+    fi
+    fpm --input-type dir --output-type deb --name vyos-intel-${DRIVER_NAME} \
+        --version ${DRIVER_VERSION}${DRIVER_VERSION_EXTRA} --deb-compression gz \
+        --maintainer "VyOS Package Maintainers <maintainers@vyos.net>" \
+        --description "Vendor based driver for Intel ${DRIVER_NAME} NIC" \
+	--depends linux-image-${KERNEL_VERSION}${KERNEL_SUFFIX} \
+	--license "GPL2" \
+        -C ${DEBIAN_DIR} --after-install ${DEBIAN_POSTINST}
+
+    echo "I: Cleanup ${DRIVER_NAME} source"
+    cd ${CWD}
+    if [ -e ${DRIVER_FILE} ]; then
+        rm -f ${DRIVER_FILE}
+    fi
+    if [ -d ${DRIVER_DIR} ]; then
+        rm -rf ${DRIVER_DIR}
+    fi
+    if [ -d ${DEBIAN_DIR} ]; then
+        rm -rf ${DEBIAN_DIR}
+    fi
+done