[PATCH] wifi: mwifiex: Replace RX workqueues with kthreads

[Pin-yen Lin <treapking@xxxxxxxxxxxx>]

This improves the RX throughput likely by better locality for the work
loads.

We tested this patch on Mediatek MT8173 Chromebooks, and it shows ~80%
Rx throughput improvement on high data rate test cases.

Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx>
---

 .../wireless/marvell/mwifiex/11n_rxreorder.c  |  2 +-
 .../net/wireless/marvell/mwifiex/cfg80211.c   |  2 +-
 drivers/net/wireless/marvell/mwifiex/main.c   | 29 ++++++++-----------
 drivers/net/wireless/marvell/mwifiex/main.h   |  5 ++--
 4 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
index 391793a16adc..431f6dc61f5b 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c
@@ -198,7 +198,7 @@ mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 	priv->adapter->rx_locked = true;
 	if (priv->adapter->rx_processing) {
 		spin_unlock_bh(&priv->adapter->rx_proc_lock);
-		flush_workqueue(priv->adapter->rx_workqueue);
+		kthread_flush_worker(priv->adapter->rx_thread);
 	} else {
 		spin_unlock_bh(&priv->adapter->rx_proc_lock);
 	}
diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index bcd564dc3554..f985bff4e52c 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -872,7 +872,7 @@ static int mwifiex_deinit_priv_params(struct mwifiex_private *priv)
 	adapter->rx_locked = true;
 	if (adapter->rx_processing) {
 		spin_unlock_bh(&adapter->rx_proc_lock);
-		flush_workqueue(adapter->rx_workqueue);
+		kthread_flush_worker(adapter->rx_thread);
 	} else {
 	spin_unlock_bh(&adapter->rx_proc_lock);
 	}
diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c
index ea22a08e6c08..bab963f3db83 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -168,7 +168,7 @@ static void mwifiex_queue_rx_work(struct mwifiex_adapter *adapter)
 		spin_unlock_bh(&adapter->rx_proc_lock);
 	} else {
 		spin_unlock_bh(&adapter->rx_proc_lock);
-		queue_work(adapter->rx_workqueue, &adapter->rx_work);
+		kthread_queue_work(adapter->rx_thread, &adapter->rx_work);
 	}
 }
 
@@ -526,9 +526,10 @@ static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 		adapter->workqueue = NULL;
 	}
 
-	if (adapter->rx_workqueue) {
-		destroy_workqueue(adapter->rx_workqueue);
-		adapter->rx_workqueue = NULL;
+	if (adapter->rx_thread) {
+		kthread_flush_worker(adapter->rx_thread);
+		kthread_destroy_worker(adapter->rx_thread);
+		adapter->rx_thread = NULL;
 	}
 }
 
@@ -1394,7 +1395,7 @@ int is_command_pending(struct mwifiex_adapter *adapter)
  *
  * It handles the RX operations.
  */
-static void mwifiex_rx_work_queue(struct work_struct *work)
+static void mwifiex_rx_work_queue(struct kthread_work *work)
 {
 	struct mwifiex_adapter *adapter =
 		container_of(work, struct mwifiex_adapter, rx_work);
@@ -1554,13 +1555,10 @@ mwifiex_reinit_sw(struct mwifiex_adapter *adapter)
 	INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 
 	if (adapter->rx_work_enabled) {
-		adapter->rx_workqueue = alloc_workqueue("MWIFIEX_RX_WORK_QUEUE",
-							WQ_HIGHPRI |
-							WQ_MEM_RECLAIM |
-							WQ_UNBOUND, 1);
-		if (!adapter->rx_workqueue)
+		adapter->rx_thread = kthread_create_worker(0, "MWIFIEX_RX");
+		if (IS_ERR(adapter->rx_thread))
 			goto err_kmalloc;
-		INIT_WORK(&adapter->rx_work, mwifiex_rx_work_queue);
+		kthread_init_work(&adapter->rx_work, mwifiex_rx_work_queue);
 	}
 
 	/* Register the device. Fill up the private data structure with
@@ -1709,14 +1707,11 @@ mwifiex_add_card(void *card, struct completion *fw_done,
 	INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 
 	if (adapter->rx_work_enabled) {
-		adapter->rx_workqueue = alloc_workqueue("MWIFIEX_RX_WORK_QUEUE",
-							WQ_HIGHPRI |
-							WQ_MEM_RECLAIM |
-							WQ_UNBOUND, 1);
-		if (!adapter->rx_workqueue)
+		adapter->rx_thread = kthread_create_worker(0, "MWIFIEX_RX");
+		if (!adapter->rx_thread)
 			goto err_kmalloc;
 
-		INIT_WORK(&adapter->rx_work, mwifiex_rx_work_queue);
+		kthread_init_work(&adapter->rx_work, mwifiex_rx_work_queue);
 	}
 
 	/* Register the device. Fill up the private data structure with relevant
diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h
index b95886e1413e..3255f9a5c2d4 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -32,6 +32,7 @@
 #include <linux/gfp.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/kthread.h>
 #include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
@@ -886,8 +887,8 @@ struct mwifiex_adapter {
 	atomic_t tx_hw_pending;
 	struct workqueue_struct *workqueue;
 	struct work_struct main_work;
-	struct workqueue_struct *rx_workqueue;
-	struct work_struct rx_work;
+	struct kthread_worker *rx_thread;
+	struct kthread_work rx_work;
 	struct workqueue_struct *dfs_workqueue;
 	struct work_struct dfs_work;
 	bool rx_work_enabled;
-- 
2.41.0.162.gfafddb0af9-goog