From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 21 Jan 2019 16:14:52 +0000 (+0100)
Subject: ramips: move wifi related interrupts off the main core on SMP systems
X-Git-Tag: v19.07.0-rc1~1425
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=01895c315f0485779a2e312c58708a32b4ea1f9a;p=openwrt%2Fopenwrt.git

ramips: move wifi related interrupts off the main core on SMP systems

Improves LAN<->WLAN bridging/routing performance

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/target/linux/ramips/base-files/etc/init.d/set-irq-affinity b/target/linux/ramips/base-files/etc/init.d/set-irq-affinity
new file mode 100755
index 0000000000..9a3afefa5a
--- /dev/null
+++ b/target/linux/ramips/base-files/etc/init.d/set-irq-affinity
@@ -0,0 +1,31 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+get_irq() {
+	local name="$1"
+	grep -m 1 "$name" /proc/interrupts | cut -d: -f1 | sed 's, *,,'
+}
+
+set_irq_affinity() {
+	local name="$1"
+	local val="$2"
+	local irq="$(get_irq "$name")"
+	[ -n "$irq" ] || return
+	echo "$val" > "/proc/irq/$irq/smp_affinity"
+}
+
+start() {
+	if grep -q 'processor.*: 2' /proc/cpuinfo; then
+		mask1=4
+		mask2=8
+	elif grep -q 'processor.*: 1' /proc/cpuinfo; then
+		mask1=2
+		mask2=2
+	else
+		return
+	fi
+
+	set_irq_affinity mt76x2e $mask1
+	set_irq_affinity mt7603e $mask2
+}