qcacld-3.0: Set cds_ol_rx_thread schedule policy to SCHED_RR

On QCS405 platform, it's observed that cds_ol_rx_pkt_freeq is empty
while receiving UDP packets, driver try to allocate cds_ol_rx_pkt in
ol_rx_data_process but failed. This leads to lots of frames got dropped.
Raise cds_ol_rx_thread scheduler policy to SCHED_RR to compete with
CE tasklet scheduler speed. With this change, found cds_ol_rx_pkt_freeq
is not going to be empty while receiving UDP packets.

Change-Id: I4bee3d69c2754ec6be10a2b623b4ebe8b2c0859b
CRs-Fixed: 2373936

Kbuild

@@ -2072,6 +2072,9 @@ cppflags-$(CONFIG_WLAN_SYSFS) += -DWLAN_SYSFS
 cppflags-$(CONFIG_FEATURE_WLAN_RMC) += -DFEATURE_WLAN_RMC
 cppflags-$(CONFIG_FEATURE_BECN_STATS) += -DWLAN_FEATURE_BEACON_RECEPTION_STATS
 
+#Set kernel thread scheduler
+cppflags-$(CONFIG_THREAD_PERFORMANCE) += -DTHREAD_PERFORMANCE
+
 #Enable OL debug and wmi unified functions
 cppflags-$(CONFIG_ATH_PERF_PWR_OFFLOAD) += -DATH_PERF_PWR_OFFLOAD
 

configs/default_defconfig

@@ -88,6 +88,7 @@ endif
 ifeq ($(CONFIG_ARCH_QCS405), y)
 	CONFIG_WLAN_SYNC_TSF_PLUS := y
 	CONFIG_WLAN_SYNC_TSF_PLUS_NOIRQ := y
+	CONFIG_THREAD_PERFORMANCE := y
 endif
 
 #Flag to enable Legacy Fast Roaming2(LFR2)

core/cds/src/cds_sched.c

@@ -35,6 +35,9 @@
 #include <linux/spinlock.h>
 #include <linux/kthread.h>
 #include <linux/cpu.h>
+#ifdef THREAD_PERFORMANCE
+#include <linux/sched/types.h>
+#endif
 
 /* Milli seconds to delay SSR thread when an Entry point is Active */
 #define SSR_WAIT_SLEEP_TIME 200
@@ -407,6 +410,12 @@ QDF_STATUS cds_sched_open(void *p_cds_context,
 		p_cds_sched_context pSchedContext,
 		uint32_t SchedCtxSize)
 {
+#ifdef THREAD_PERFORMANCE
+	struct sched_param param;
+
+	param.sched_priority = 99;
+#endif
+
 	cds_debug("Opening the CDS Scheduler");
 	/* Sanity checks */
 	if ((p_cds_context == NULL) || (pSchedContext == NULL)) {
@@ -453,6 +462,9 @@ QDF_STATUS cds_sched_open(void *p_cds_context,
 		goto OL_RX_THREAD_START_FAILURE;
 
 	}
+#ifdef THREAD_PERFORMANCE
+	sched_setscheduler(pSchedContext->ol_rx_thread, SCHED_RR, &param);
+#endif
 	wake_up_process(pSchedContext->ol_rx_thread);
 	cds_debug("CDS OL RX thread Created");
 	wait_for_completion_interruptible(&pSchedContext->ol_rx_start_event);