net/ethtool: official interface for changing ethtool params (bug #195479)

Implement a consistent interface for changing ethtool parameters, as
suggested in bug 195479. All variable names are based on the long option
to ethtool to set each group of parameters. Multiple entries seperated
by newlines are permitted for variable values.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
X-Gentoo-Bug: 195479

1 files changed, 54 insertions, 0 deletions

diff --git a/net/ethtool.sh b/net/ethtool.sh
new file mode 100644
index 0000000..64b44a6
--- /dev/null
+++ b/net/ethtool.sh
@@ -0,0 +1,54 @@
+# Copyright (c) 2011 by Gentoo Foundation
+# All rights reserved. Released under the 2-clause BSD license.
+
+_ethtool() {
+	echo /usr/sbin/ethtool
+}
+
+ethtool_depend()
+{
+	program $(_ethtool)
+	before interface
+}
+
+# This is just to trim whitespace, do not add any quoting!
+_trim() {
+	echo $*
+}
+
+ethtool_pre_start() {
+	local order opt OFS="${OIFS}"
+	eval order=\$ethtool_order_${IFVAR}
+	[ -z "${order}" ] && eval order=\$ethtool_order
+	[ -z "${order}" ] && order="flash change-eeprom change pause coalesce ring offload identify nfc rxfh-indir ntuple"
+	# ethtool options not used: --driver, --register-dump, --eeprom-dump, --negotiate, --test, --statistics
+	eindent
+	for opt in ${order} ; do
+		local args
+		eval args=\$ethtool_${opt//-/_}_${IFVAR}
+
+		# Skip everything if no arguments
+		[ -z "${args}" ] && continue
+		
+		# Split on \n
+		local IFS="$__IFS"
+
+		for p in ${args} ; do
+			IFS="${OIFS}"
+			local args_pretty="$(_trim "${p}")"
+			# Do nothing if empty
+			[ -z "${args_prety}" ] && continue
+			args_pretty="--${opt} $IFACE ${args_pretty}"
+			args="--${opt} $IFACE ${args}"
+			ebegin "ethtool ${args_pretty}"
+			$(_ethtool) ${args}
+			rc=$?
+			eend $rc "ethtool exit code $rc"
+			# TODO: ethtool has MANY different exit codes, with no
+			# documentation as to which ones are fatal or not. For now we
+			# simply print the exit code and don't stop the start sequence.
+		done
+		IFS="${OIFS}"
+	done
+	eoutdent
+}