From 88a062f74b504202f65b636c6d0332629639958f Mon Sep 17 00:00:00 2001
From: Mayank Haarit <mayank.h@samsung.com>
Date: Mon, 21 May 2018 18:23:36 +0530
Subject: [PATCH] Set the RPS configuration on Wi-Fi activate.

This patch enable RPS (Received packet steering) and specific CPUs
to process the packet for the receive queues of the wlan0 interface.

Change-Id: Ide73358ac99f49eb2c7254fe1a7026f491e58cfd
Signed-off-by: Mayank Haarit <mayank.h@samsung.com>
---
 src/wifi-firmware.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/src/wifi-firmware.c b/src/wifi-firmware.c
index 2195913..60a7abe 100755
--- a/src/wifi-firmware.c
+++ b/src/wifi-firmware.c
@@ -20,6 +20,8 @@
 #include <errno.h>
 #include <vconf.h>
 #include <vconf-keys.h>
+#include <stdio.h>
+#include <fcntl.h>
 
 #include "log.h"
 #include "util.h"
@@ -36,6 +38,9 @@
 #define WLAN_P2P_IFACE_NAME_TV			"p2p0"
 #define WLAN_P2P_IFACE_NAME_COMMON			"wlan0"
 #define WLAN_P2P_IFACE_NAME ((TIZEN_TV) ? (WLAN_P2P_IFACE_NAME_TV) : (WLAN_P2P_IFACE_NAME_COMMON))
+#define QUAD_CPUS_COUNT			4
+#define TEMP_BUFFER_LEN			100
+#define WIFI_MAC_ADD_PATH		"/sys/class/net/wlan0/address"
 
 static int __netconfig_sta_firmware_start(void)
 {
@@ -205,6 +210,69 @@ static int __netconfig_wifi_firmware_stop(enum netconfig_wifi_firmware type)
 	return -ENXIO;
 }
 
+static int __netconfig_set_rps_cpus(void)
+{
+	int fd, i;
+	ssize_t count;
+	char t_buf[TEMP_BUFFER_LEN];
+	char r_buf[TEMP_BUFFER_LEN];
+
+	if (access(WIFI_MAC_ADD_PATH, F_OK) != 0) {
+		DBG("WiFi driver is not loaded... ");
+		return -1;
+	} else {
+		DBG("WiFi driver loaded... ");
+	}
+
+	for (i = 0; i < QUAD_CPUS_COUNT; i++) {
+		snprintf(t_buf, TEMP_BUFFER_LEN, "/sys/class/net/wlan0/queues/rx-%d/rps_cpus", i);
+		DBG("Command : [%s]", t_buf);
+		fd = open(t_buf, O_RDWR | O_CLOEXEC);
+
+		if (fd < 0) {
+			DBG("failed to open rps file");
+			return -1;
+		} else {
+			count = read(fd, r_buf, 1);
+
+			if (count < 0) {
+				DBG("read failed");
+				close(fd);
+				return -1;
+			} else {
+				DBG("read size = %d", count);
+			}
+
+			if (r_buf[0] == 'e') {
+				close(fd);
+				continue;
+			} else {
+				DBG("e is already written");
+			}
+
+			if (lseek(fd, 0, SEEK_SET) < 0) {
+				DBG("lseek failed");
+				close(fd);
+				return -1;
+			}
+
+			count = write(fd, "e", 1);
+
+			if (count < 0) {
+				DBG("write failed");
+				close(fd);
+				return -1;
+			} else {
+				DBG("write size = %d", count);
+			}
+
+			close(fd);
+		}
+	}
+
+	return 0;
+}
+
 int netconfig_wifi_firmware(enum netconfig_wifi_firmware type, gboolean enable)
 {
 	int err;
@@ -244,6 +312,9 @@ int netconfig_wifi_firmware(enum netconfig_wifi_firmware type, gboolean enable)
 	else
 		current_driver = alias;
 
+	if (__netconfig_set_rps_cpus() < 0)
+		DBG("Failed to set rps_cpus");
+
 	return err;
 }
 
-- 
2.7.4