[net-next v3 07/15] net: thunderx: Convert tasklet API to new bottom half workqueue mechanism

[Allen Pais]

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

Reviewed-by: Sunil Goutham <sgoutham@xxxxxxxxxxx>
Signed-off-by: Allen Pais <allen.lkml@xxxxxxxxx>
---
 drivers/net/ethernet/cavium/thunder/nic.h     |  5 ++--
 .../net/ethernet/cavium/thunder/nicvf_main.c  | 24 +++++++++----------
 .../ethernet/cavium/thunder/nicvf_queues.c    |  4 ++--
 .../ethernet/cavium/thunder/nicvf_queues.h    |  2 +-
 4 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nic.h b/drivers/net/ethernet/cavium/thunder/nic.h
index 090d6b83982a..ecc175b6e7fa 100644
--- a/drivers/net/ethernet/cavium/thunder/nic.h
+++ b/drivers/net/ethernet/cavium/thunder/nic.h
@@ -8,6 +8,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/interrupt.h>
+#include <linux/workqueue.h>
 #include <linux/pci.h>
 #include "thunder_bgx.h"
 
@@ -295,7 +296,7 @@ struct nicvf {
 	bool			rb_work_scheduled;
 	struct page		*rb_page;
 	struct delayed_work	rbdr_work;
-	struct tasklet_struct	rbdr_task;
+	struct work_struct	rbdr_bh_work;
 
 	/* Secondary Qset */
 	u8			sqs_count;
@@ -319,7 +320,7 @@ struct nicvf {
 	bool			loopback_supported;
 	struct nicvf_rss_info	rss_info;
 	struct nicvf_pfc	pfc;
-	struct tasklet_struct	qs_err_task;
+	struct work_struct	qs_err_bh_work;
 	struct work_struct	reset_task;
 	struct nicvf_work       rx_mode_work;
 	/* spinlock to protect workqueue arguments from concurrent access */
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index aebb9fef3f6e..b0878bd25cf0 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -982,9 +982,9 @@ static int nicvf_poll(struct napi_struct *napi, int budget)
  *
  * As of now only CQ errors are handled
  */
-static void nicvf_handle_qs_err(struct tasklet_struct *t)
+static void nicvf_handle_qs_err(struct work_struct *work)
 {
-	struct nicvf *nic = from_tasklet(nic, t, qs_err_task);
+	struct nicvf *nic = from_work(nic, work, qs_err_bh_work);
 	struct queue_set *qs = nic->qs;
 	int qidx;
 	u64 status;
@@ -1069,7 +1069,7 @@ static irqreturn_t nicvf_rbdr_intr_handler(int irq, void *nicvf_irq)
 		if (!nicvf_is_intr_enabled(nic, NICVF_INTR_RBDR, qidx))
 			continue;
 		nicvf_disable_intr(nic, NICVF_INTR_RBDR, qidx);
-		tasklet_hi_schedule(&nic->rbdr_task);
+		queue_work(system_bh_highpri_wq, &nic->rbdr_bh_work);
 		/* Clear interrupt */
 		nicvf_clear_intr(nic, NICVF_INTR_RBDR, qidx);
 	}
@@ -1085,7 +1085,7 @@ static irqreturn_t nicvf_qs_err_intr_handler(int irq, void *nicvf_irq)
 
 	/* Disable Qset err interrupt and schedule softirq */
 	nicvf_disable_intr(nic, NICVF_INTR_QS_ERR, 0);
-	tasklet_hi_schedule(&nic->qs_err_task);
+	queue_work(system_bh_highpri_wq, &nic->qs_err_bh_work);
 	nicvf_clear_intr(nic, NICVF_INTR_QS_ERR, 0);
 
 	return IRQ_HANDLED;
@@ -1364,8 +1364,8 @@ int nicvf_stop(struct net_device *netdev)
 	for (irq = 0; irq < nic->num_vec; irq++)
 		synchronize_irq(pci_irq_vector(nic->pdev, irq));
 
-	tasklet_kill(&nic->rbdr_task);
-	tasklet_kill(&nic->qs_err_task);
+	cancel_work_sync(&nic->rbdr_bh_work);
+	cancel_work_sync(&nic->qs_err_bh_work);
 	if (nic->rb_work_scheduled)
 		cancel_delayed_work_sync(&nic->rbdr_work);
 
@@ -1488,11 +1488,11 @@ int nicvf_open(struct net_device *netdev)
 		nicvf_hw_set_mac_addr(nic, netdev);
 	}
 
-	/* Init tasklet for handling Qset err interrupt */
-	tasklet_setup(&nic->qs_err_task, nicvf_handle_qs_err);
+	/* Init bh_work for handling Qset err interrupt */
+	INIT_WORK(&nic->qs_err_bh_work, nicvf_handle_qs_err);
 
-	/* Init RBDR tasklet which will refill RBDR */
-	tasklet_setup(&nic->rbdr_task, nicvf_rbdr_task);
+	/* Init RBDR bh_work which will refill RBDR */
+	INIT_WORK(&nic->rbdr_bh_work, nicvf_rbdr_bh_work);
 	INIT_DELAYED_WORK(&nic->rbdr_work, nicvf_rbdr_work);
 
 	/* Configure CPI alorithm */
@@ -1561,8 +1561,8 @@ int nicvf_open(struct net_device *netdev)
 cleanup:
 	nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
 	nicvf_unregister_interrupts(nic);
-	tasklet_kill(&nic->qs_err_task);
-	tasklet_kill(&nic->rbdr_task);
+	cancel_work_sync(&nic->qs_err_bh_work);
+	cancel_work_sync(&nic->rbdr_bh_work);
 napi_del:
 	for (qidx = 0; qidx < qs->cq_cnt; qidx++) {
 		cq_poll = nic->napi[qidx];
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index 06397cc8bb36..ad71160879e4 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -461,9 +461,9 @@ void nicvf_rbdr_work(struct work_struct *work)
 }
 
 /* In Softirq context, alloc rcv buffers in atomic mode */
-void nicvf_rbdr_task(struct tasklet_struct *t)
+void nicvf_rbdr_bh_work(struct work_struct *work)
 {
-	struct nicvf *nic = from_tasklet(nic, t, rbdr_task);
+	struct nicvf *nic = from_work(nic, work, rbdr_bh_work);
 
 	nicvf_refill_rbdr(nic, GFP_ATOMIC);
 	if (nic->rb_alloc_fail) {
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
index 8453defc296c..c6f18fb7c50e 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h
@@ -348,7 +348,7 @@ void nicvf_xdp_sq_doorbell(struct nicvf *nic, struct snd_queue *sq, int sq_num);
 
 struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic,
 				  struct cqe_rx_t *cqe_rx, bool xdp);
-void nicvf_rbdr_task(struct tasklet_struct *t);
+void nicvf_rbdr_bh_work(struct work_struct *work);
 void nicvf_rbdr_work(struct work_struct *work);
 
 void nicvf_enable_intr(struct nicvf *nic, int int_type, int q_idx);
-- 
2.34.1