[net-next v3 13/15] net: jme: Convert tasklet API to new bottom half workqueue mechanism

[Allen Pais <allen.lkml@gmail.com>]

Migrate tasklet APIs to the new bottom half workqueue mechanism. It
replaces all occurrences of tasklet usage with the appropriate workqueue
APIs throughout the jme driver. This transition ensures compatibility
with the latest design and enhances performance.

We should queue the work only if it was queued at cancel time.
Introduce rxempty_bh_work_queued, suggested by Paolo Abeni.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
---
 drivers/net/ethernet/jme.c | 80 +++++++++++++++++++++-----------------
 drivers/net/ethernet/jme.h |  9 +++--
 2 files changed, 49 insertions(+), 40 deletions(-)

diff --git a/drivers/net/ethernet/jme.c b/drivers/net/ethernet/jme.c
index b06e24562973..bdaeaeb477e4 100644
--- a/drivers/net/ethernet/jme.c
+++ b/drivers/net/ethernet/jme.c
@@ -1141,7 +1141,7 @@ jme_dynamic_pcc(struct jme_adapter *jme)
 
 	if (unlikely(dpi->attempt != dpi->cur && dpi->cnt > 5)) {
 		if (dpi->attempt < dpi->cur)
-			tasklet_schedule(&jme->rxclean_task);
+			queue_work(system_bh_wq, &jme->rxclean_bh_work);
 		jme_set_rx_pcc(jme, dpi->attempt);
 		dpi->cur = dpi->attempt;
 		dpi->cnt = 0;
@@ -1182,9 +1182,9 @@ jme_shutdown_nic(struct jme_adapter *jme)
 }
 
 static void
-jme_pcc_tasklet(struct tasklet_struct *t)
+jme_pcc_bh_work(struct work_struct *work)
 {
-	struct jme_adapter *jme = from_tasklet(jme, t, pcc_task);
+	struct jme_adapter *jme = from_work(jme, work, pcc_bh_work);
 	struct net_device *netdev = jme->dev;
 
 	if (unlikely(test_bit(JME_FLAG_SHUTDOWN, &jme->flags))) {
@@ -1282,9 +1282,9 @@ static void jme_link_change_work(struct work_struct *work)
 		jme_stop_shutdown_timer(jme);
 
 	jme_stop_pcc_timer(jme);
-	tasklet_disable(&jme->txclean_task);
-	tasklet_disable(&jme->rxclean_task);
-	tasklet_disable(&jme->rxempty_task);
+	disable_work_sync(&jme->txclean_bh_work);
+	disable_work_sync(&jme->rxclean_bh_work);
+	jme->rxempty_bh_work_queued = disable_work_sync(&jme->rxempty_bh_work);
 
 	if (netif_carrier_ok(netdev)) {
 		jme_disable_rx_engine(jme);
@@ -1304,7 +1304,7 @@ static void jme_link_change_work(struct work_struct *work)
 		rc = jme_setup_rx_resources(jme);
 		if (rc) {
 			pr_err("Allocating resources for RX error, Device STOPPED!\n");
-			goto out_enable_tasklet;
+			goto out_enable_bh_work;
 		}
 
 		rc = jme_setup_tx_resources(jme);
@@ -1326,22 +1326,26 @@ static void jme_link_change_work(struct work_struct *work)
 		jme_start_shutdown_timer(jme);
 	}
 
-	goto out_enable_tasklet;
+	goto out_enable_bh_work;
 
 err_out_free_rx_resources:
 	jme_free_rx_resources(jme);
-out_enable_tasklet:
-	tasklet_enable(&jme->txclean_task);
-	tasklet_enable(&jme->rxclean_task);
-	tasklet_enable(&jme->rxempty_task);
+out_enable_bh_work:
+	enable_and_queue_work(system_bh_wq, &jme->txclean_bh_work);
+	enable_and_queue_work(system_bh_wq, &jme->rxclean_bh_work);
+	if (jme->rxempty_bh_work_queued)
+		enable_and_queue_work(system_bh_wq, &jme->rxempty_bh_work);
+	else
+		enable_work(&jme->rxempty_bh_work);
+
 out:
 	atomic_inc(&jme->link_changing);
 }
 
 static void
-jme_rx_clean_tasklet(struct tasklet_struct *t)
+jme_rx_clean_bh_work(struct work_struct *work)
 {
-	struct jme_adapter *jme = from_tasklet(jme, t, rxclean_task);
+	struct jme_adapter *jme = from_work(jme, work, rxclean_bh_work);
 	struct dynpcc_info *dpi = &(jme->dpi);
 
 	jme_process_receive(jme, jme->rx_ring_size);
@@ -1374,9 +1378,9 @@ jme_poll(JME_NAPI_HOLDER(holder), JME_NAPI_WEIGHT(budget))
 }
 
 static void
-jme_rx_empty_tasklet(struct tasklet_struct *t)
+jme_rx_empty_bh_work(struct work_struct *work)
 {
-	struct jme_adapter *jme = from_tasklet(jme, t, rxempty_task);
+	struct jme_adapter *jme = from_work(jme, work, rxempty_bh_work);
 
 	if (unlikely(atomic_read(&jme->link_changing) != 1))
 		return;
@@ -1386,7 +1390,7 @@ jme_rx_empty_tasklet(struct tasklet_struct *t)
 
 	netif_info(jme, rx_status, jme->dev, "RX Queue Full!\n");
 
-	jme_rx_clean_tasklet(&jme->rxclean_task);
+	jme_rx_clean_bh_work(&jme->rxclean_bh_work);
 
 	while (atomic_read(&jme->rx_empty) > 0) {
 		atomic_dec(&jme->rx_empty);
@@ -1410,9 +1414,9 @@ jme_wake_queue_if_stopped(struct jme_adapter *jme)
 
 }
 
-static void jme_tx_clean_tasklet(struct tasklet_struct *t)
+static void jme_tx_clean_bh_work(struct work_struct *work)
 {
-	struct jme_adapter *jme = from_tasklet(jme, t, txclean_task);
+	struct jme_adapter *jme = from_work(jme, work, txclean_bh_work);
 	struct jme_ring *txring = &(jme->txring[0]);
 	struct txdesc *txdesc = txring->desc;
 	struct jme_buffer_info *txbi = txring->bufinf, *ctxbi, *ttxbi;
@@ -1510,12 +1514,12 @@ jme_intr_msi(struct jme_adapter *jme, u32 intrstat)
 
 	if (intrstat & INTR_TMINTR) {
 		jwrite32(jme, JME_IEVE, INTR_TMINTR);
-		tasklet_schedule(&jme->pcc_task);
+		queue_work(system_bh_wq, &jme->pcc_bh_work);
 	}
 
 	if (intrstat & (INTR_PCCTXTO | INTR_PCCTX)) {
 		jwrite32(jme, JME_IEVE, INTR_PCCTXTO | INTR_PCCTX | INTR_TX0);
-		tasklet_schedule(&jme->txclean_task);
+		queue_work(system_bh_wq, &jme->txclean_bh_work);
 	}
 
 	if ((intrstat & (INTR_PCCRX0TO | INTR_PCCRX0 | INTR_RX0EMP))) {
@@ -1538,9 +1542,9 @@ jme_intr_msi(struct jme_adapter *jme, u32 intrstat)
 	} else {
 		if (intrstat & INTR_RX0EMP) {
 			atomic_inc(&jme->rx_empty);
-			tasklet_hi_schedule(&jme->rxempty_task);
+			queue_work(system_bh_highpri_wq, &jme->rxempty_bh_work);
 		} else if (intrstat & (INTR_PCCRX0TO | INTR_PCCRX0)) {
-			tasklet_hi_schedule(&jme->rxclean_task);
+			queue_work(system_bh_highpri_wq, &jme->rxclean_bh_work);
 		}
 	}
 
@@ -1826,9 +1830,9 @@ jme_open(struct net_device *netdev)
 	jme_clear_pm_disable_wol(jme);
 	JME_NAPI_ENABLE(jme);
 
-	tasklet_setup(&jme->txclean_task, jme_tx_clean_tasklet);
-	tasklet_setup(&jme->rxclean_task, jme_rx_clean_tasklet);
-	tasklet_setup(&jme->rxempty_task, jme_rx_empty_tasklet);
+	INIT_WORK(&jme->txclean_bh_work, jme_tx_clean_bh_work);
+	INIT_WORK(&jme->rxclean_bh_work, jme_rx_clean_bh_work);
+	INIT_WORK(&jme->rxempty_bh_work, jme_rx_empty_bh_work);
 
 	rc = jme_request_irq(jme);
 	if (rc)
@@ -1914,9 +1918,10 @@ jme_close(struct net_device *netdev)
 	JME_NAPI_DISABLE(jme);
 
 	cancel_work_sync(&jme->linkch_task);
-	tasklet_kill(&jme->txclean_task);
-	tasklet_kill(&jme->rxclean_task);
-	tasklet_kill(&jme->rxempty_task);
+	cancel_work_sync(&jme->txclean_bh_work);
+	cancel_work_sync(&jme->rxclean_bh_work);
+	jme->rxempty_bh_work_queued = false;
+	cancel_work_sync(&jme->rxempty_bh_work);
 
 	jme_disable_rx_engine(jme);
 	jme_disable_tx_engine(jme);
@@ -3020,7 +3025,7 @@ jme_init_one(struct pci_dev *pdev,
 	atomic_set(&jme->tx_cleaning, 1);
 	atomic_set(&jme->rx_empty, 1);
 
-	tasklet_setup(&jme->pcc_task, jme_pcc_tasklet);
+	INIT_WORK(&jme->pcc_bh_work, jme_pcc_bh_work);
 	INIT_WORK(&jme->linkch_task, jme_link_change_work);
 	jme->dpi.cur = PCC_P1;
 
@@ -3180,9 +3185,9 @@ jme_suspend(struct device *dev)
 	netif_stop_queue(netdev);
 	jme_stop_irq(jme);
 
-	tasklet_disable(&jme->txclean_task);
-	tasklet_disable(&jme->rxclean_task);
-	tasklet_disable(&jme->rxempty_task);
+	disable_work_sync(&jme->txclean_bh_work);
+	disable_work_sync(&jme->rxclean_bh_work);
+	jme->rxempty_bh_work_queued = disable_work_sync(&jme->rxempty_bh_work);
 
 	if (netif_carrier_ok(netdev)) {
 		if (test_bit(JME_FLAG_POLL, &jme->flags))
@@ -3198,9 +3203,12 @@ jme_suspend(struct device *dev)
 		jme->phylink = 0;
 	}
 
-	tasklet_enable(&jme->txclean_task);
-	tasklet_enable(&jme->rxclean_task);
-	tasklet_enable(&jme->rxempty_task);
+	enable_and_queue_work(system_bh_wq, &jme->txclean_bh_work);
+	enable_and_queue_work(system_bh_wq, &jme->rxclean_bh_work);
+	if (jme->rxempty_bh_work_queued)
+		enable_and_queue_work(system_bh_wq, &jme->rxempty_bh_work);
+	else
+		enable_work(&jme->rxempty_bh_work);
 
 	jme_powersave_phy(jme);
 
diff --git a/drivers/net/ethernet/jme.h b/drivers/net/ethernet/jme.h
index 860494ff3714..44aaf7625dc3 100644
--- a/drivers/net/ethernet/jme.h
+++ b/drivers/net/ethernet/jme.h
@@ -406,11 +406,12 @@ struct jme_adapter {
 	spinlock_t		phy_lock;
 	spinlock_t		macaddr_lock;
 	spinlock_t		rxmcs_lock;
-	struct tasklet_struct	rxempty_task;
-	struct tasklet_struct	rxclean_task;
-	struct tasklet_struct	txclean_task;
+	struct work_struct	rxempty_bh_work;
+	struct work_struct	rxclean_bh_work;
+	struct work_struct	txclean_bh_work;
+	bool			rxempty_bh_work_queued;
 	struct work_struct	linkch_task;
-	struct tasklet_struct	pcc_task;
+	struct work_struct	pcc_bh_work;
 	unsigned long		flags;
 	u32			reg_txcs;
 	u32			reg_txpfc;
-- 
2.34.1