[openwrt/openwrt] netifd: update to the latest version, rewrite RPS/XPS handling

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/916e33fa1e14b97daf8c9bf07a1b36f9767db679

commit 916e33fa1e14b97daf8c9bf07a1b36f9767db679
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Feb 26 12:30:28 2018 +0100

    netifd: update to the latest version, rewrite RPS/XPS handling
    
    Remove RPS/XPS support from netifd core, move the logic to a hotplug
    script that uses a different policy which provides better performance
    and more fairness across flows
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/network/config/netifd/Makefile             |  6 +-
 .../netifd/files/etc/hotplug.d/net/20-smp-tune     | 67 ++++++++++++++++++++++
 2 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/package/network/config/netifd/Makefile b/package/network/config/netifd/Makefile
index d62b60a..6e208dd 100644
--- a/package/network/config/netifd/Makefile
+++ b/package/network/config/netifd/Makefile
@@ -5,9 +5,9 @@ PKG_RELEASE:=4
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/netifd.git
-PKG_SOURCE_DATE:=2018-02-05
-PKG_SOURCE_VERSION:=1be329c66326c86d7a48ba71004fcef7691bbbf9
-PKG_MIRROR_HASH:=06c1c24ed56b4fe39b92b33719f8bd4f9a8fe3c6a25ce02a6a245e859f1237bf
+PKG_SOURCE_DATE:=2018-02-26
+PKG_SOURCE_VERSION:=8cdb17d2c58d5c3ecb57bdaf1981cd72b4948db1
+PKG_MIRROR_HASH:=5c0859b779c9665edd7c105b92b7022fa7544e3a704e0e05bb3ab11ba0c30384
 PKG_MAINTAINER:=Felix Fietkau <nbd at nbd.name>
 
 PKG_LICENSE:=GPL-2.0
diff --git a/package/network/config/netifd/files/etc/hotplug.d/net/20-smp-tune b/package/network/config/netifd/files/etc/hotplug.d/net/20-smp-tune
new file mode 100644
index 0000000..ab9a904
--- /dev/null
+++ b/package/network/config/netifd/files/etc/hotplug.d/net/20-smp-tune
@@ -0,0 +1,67 @@
+#!/bin/sh
+[ "$ACTION" = add ] || exit
+
+NPROCS="$(grep -c "^processor.*:" /proc/cpuinfo)"
+[ "$NPROCS" -gt 1 ] || exit
+
+PROC_MASK="$(( (1 << $NPROCS) - 1 ))"
+
+find_irq_cpu() {
+	local dev="$1"
+	local match="$(grep -m 1 "$dev\$" /proc/interrupts)"
+	local cpu=0
+
+	[ -n "$match" ] && {
+		set -- $match
+		shift
+		for cur in `seq 1 $NPROCS`; do
+			[ "$1" -gt 0 ] && {
+				cpu=$(($cur - 1))
+				break
+			}
+			shift
+		done
+	}
+
+	echo "$cpu"
+}
+
+set_hex_val() {
+	local file="$1"
+	local val="$2"
+	val="$(printf %x "$val")"
+	[ -n "$DEBUG" ] && echo "$file = $val"
+	echo "$val" > "$file"
+}
+
+default_ps="$(uci get "network. at globals[0].default_ps")"
+[ -n "$default_ps" -a "$default_ps" != 1 ] && exit 0
+
+exec 512>/var/lock/smp_tune.lock
+flock 512 || exit 1
+
+for dev in /sys/class/net/*; do
+	[ -d "$dev" ] || continue
+
+	# ignore virtual interfaces
+	[ -n "$(ls "${dev}/" | grep '^lower_')" ] && continue
+	[ -d "${dev}/device" ] || continue
+
+	device="$(readlink "${dev}/device")"
+	device="$(basename "$device")"
+	irq_cpu="$(find_irq_cpu "$device")"
+	irq_cpu_mask="$((1 << $irq_cpu))"
+
+	for q in ${dev}/queues/rx-*; do
+		set_hex_val "$q/rps_cpus" "$(($PROC_MASK & ~$irq_cpu_mask))"
+	done
+
+	ntxq="$(ls -d ${dev}/queues/tx-* | wc -l)"
+
+	idx=$(($irq_cpu + 1))
+	for q in ${dev}/queues/tx-*; do
+		set_hex_val "$q/xps_cpus" "$((1 << $idx))"
+		let "idx = idx + 1"
+		[ "$idx" -ge "$NPROCS" ] && idx=0
+	done
+done