board/common: convert tc error message to useful information

When we opportunistically set up mqprio on all interfaces, we pass over
interfaces without offloading support.  Catch that error message and log
an informational message about which interfaces are skipped.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/usr/libexec/infix/init.d/25-mqprio

@@ -46,7 +46,11 @@ while [ "$1" ]; do
     [ $txqs -lt 2 ] && continue
     [ $txqs -gt 8 ] && txqs=8
 
-    tc qdisc add dev $iface root mqprio hw 1 \
-       num_tc $txqs $(map $txqs) $(queues $txqs) || true
+    output=$(tc qdisc add dev $iface root mqprio hw 1 \
+		num_tc $txqs $(map $txqs) $(queues $txqs) 2>&1) || true
+    if echo "$output" | grep -q "does not support hardware offload"; then
+        echo "Skipping $iface, hardware offload not supported."
+    elif [ -n "$output" ]; then
+	echo "$output"
+    fi
 done
-