ethtool-offload

#! /usr/bin/env bash

# For OpenWrt hotplug.d Scripts
if [ -n "$ACTION" ]; then
    if [ "$ACTION" = "add" ] || [ "$ACTION" = "ifup" ]; then
        :
    else
        exit 0
    fi
fi

# Disable on Routers, Enable Elsewhere
lroDisable=false

rxGroListDisable=true
txNocacheCopyDisable=true

# For OpenWrt hotplug.d Scripts
if [ -n "$DEVICE" ] || [ -n "$DEVICENAME" ]; then
    echo "[ethtool-offload] Enabling offloading on the following interfaces: $DEVICE $DEVICENAME."
    interfaces="$DEVICE $DEVICENAME"
else
    if [ $# -eq 0 ]; then
       echo "[ethtool-offload] Enabling offloading on all interfaces."
       interfaces="$(ip -o link show | awk -F': ' '{print $2}' | grep -v "lo" | sed 's/@.*$//')"
    else
       echo "[ethtool-offload] Enabling offloading on the following interfaces: $@."
       interfaces="$@"
    fi
fi

for i in $interfaces; do
    ethtool --offload "$i" rx on tx on sg on tso on ufo on gso on gro on lro on rxvlan on txvlan on ntuple on rxhash on rx-udp-gro-forwarding on

    if [ "$lroDisable" = true ]; then
        echo "[ethtool-offload] Disabling lro on $i..."
        echo "[ethtool-offload] See https://serverfault.com/a/806454 for more information."
        ethtool -K "$i" "lro" off
    fi

    if [ "$rxGroListDisable" = true ]; then
        echo "[ethtool-offload] Disabling rx-gro-list on $i..."
        echo "[ethtool-offload] See https://tailscale.com/blog/quic-udp-throughput for more information."
        ethtool -K "$i" "rx-gro-list" off
    fi

    if [ "$txNocacheCopyDisable" = true ]; then
        echo "[ethtool-offload] Disabling tx-nocache-copy on $i..."
        echo "[ethtool-offload] See https://enterprise-support.nvidia.com/s/article/how-to-bypass-local-cache--disable-tx-nocache-copy-x for more information."
        ethtool -K "$i" "tx-nocache-copy" off
    fi
done

ethtool-offload.rules

ACTION=="add|bind", SUBSYSTEM=="net", RUN+="/usr/local/sbin/ethtool-offload %k"
ACTION=="change", SUBSYSTEM=="net", ATTR{operstate}=="up", RUN+="/usr/local/sbin/ethtool-offload %k"