Restarts your sys-net without requiring shutting everything else down first. Useful if your wifi drivers hang regularly... :(

qubes-net-restart.sh

#!/bin/sh

# TODO: detect sys-net(s) by pci attachment & sys-firewall(s) by netvm == $sys-net(s)

if [ -z "$NET_RESTART_LOCK" ]; then
	if env NET_RESTART_LOCK=ok flock -o -n /var/run/qubes/net-restart.lock "$0" "$@"; then
		exit 0
	else
		echo "$0: Failed to aquire lock" >&2
		exit 1
	fi
fi

[ X"$1" = X-v ] && v=true || v=false

step() {
	step="$1"
	shift
	if $v; then
		echo "$step"
		"$@" 2>&1 | sed 's/^/\t/'
	else
		echo -n "$step... "
		"$@" >/dev/null 2>&1
		echo done
	fi
}

step "Removing netvm from sys-firewall" qvm-prefs -s sys-firewall netvm none
step "Shutting down sys-net" qvm-shutdown --wait sys-net
step "Starting sys-net" qvm-start sys-net
step "Restoring netvm to sys-firewall" qvm-prefs -s sys-firewall netvm sys-net

So actually, if you just add the relevant drivers to /rw/config/suspend-module-blacklist in your sys-net, Qubes will {un,re}load them for you on suspend/resume, which is a much better (faster, and no manual button pressing on fail) solution than this.