From ffdc908e7baa2b9fdb573e737e17830fb3c1f4b8 Mon Sep 17 00:00:00 2001
From: Qosmio <datapronix@protonmail.com>
Date: Sat, 27 Jan 2024 18:18:36 -0500
Subject: [PATCH] qca-nss-drv: add affinity function to set last match

Since NSS IRQs use the same name for each core, the current function
assigns all matching names to the same CPU core. Add function
'set_affinity_last' to specify that only the 'last' matching irq ID be set
to the specified CPU core.
---
 qca/qca-nss-drv/files/qca-nss-drv.init | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/qca/qca-nss-drv/files/qca-nss-drv.init b/qca/qca-nss-drv/files/qca-nss-drv.init
index f8bccc6..7c71e38 100644
--- a/qca/qca-nss-drv/files/qca-nss-drv.init
+++ b/qca/qca-nss-drv/files/qca-nss-drv.init
@@ -24,6 +24,12 @@ enable_rps() {
 		[ -n "$irq" ] && echo $2 > /proc/irq/$irq/smp_affinity
 	  done
 	}
+	set_affinity_last() {
+		awk "/$1/{sub(/:/,\"\");last=\$1} END{print last}" /proc/interrupts| while read irq
+	  do
+		[ -n "$irq" ] && echo $2 > /proc/irq/$irq/smp_affinity
+	  done
+	}
 
 	# assign 3 nss queues to each core
 	set_affinity 'nss_queue1' 2
@@ -34,6 +40,7 @@ enable_rps() {
 	# assign lan/wan to core 4
 	set_affinity 'nss_empty_buf_sos' 4
 	set_affinity 'nss_empty_buf_queue' 4
+	set_affinity_last 'nss_empty_buf_sos' 8
 
 	# Enable NSS RPS
 	sysctl -w dev.nss.rps.enable=1 > /dev/null 2> /dev/null
@@ -45,3 +52,4 @@ start() {
 	  enable_rps
 	fi
 }
+