[PATCH 05/15] net: cavium/liquidio: 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 cavium/liquidio driver. This transition ensures
compatibility with the latest design and enhances performance.

Signed-off-by: Allen Pais <allen.lkml@gmail.com>
---
 .../net/ethernet/cavium/liquidio/lio_core.c   |  4 ++--
 .../net/ethernet/cavium/liquidio/lio_main.c   | 24 +++++++++----------
 .../ethernet/cavium/liquidio/lio_vf_main.c    | 10 ++++----
 .../ethernet/cavium/liquidio/octeon_droq.c    |  4 ++--
 .../ethernet/cavium/liquidio/octeon_main.h    |  4 ++--
 5 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_core.c b/drivers/net/ethernet/cavium/liquidio/lio_core.c
index 674c54831875..37307e02a6ff 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_core.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_core.c
@@ -925,7 +925,7 @@ int liquidio_schedule_msix_droq_pkt_handler(struct octeon_droq *droq, u64 ret)
 			if (OCTEON_CN23XX_VF(oct))
 				dev_err(&oct->pci_dev->dev,
 					"should not come here should not get rx when poll mode = 0 for vf\n");
-			tasklet_schedule(&oct_priv->droq_tasklet);
+			queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 			return 1;
 		}
 		/* this will be flushed periodically by check iq db */
@@ -975,7 +975,7 @@ static void liquidio_schedule_droq_pkt_handlers(struct octeon_device *oct)
 				droq->ops.napi_fn(droq);
 				oct_priv->napi_mask |= BIT_ULL(oq_no);
 			} else {
-				tasklet_schedule(&oct_priv->droq_tasklet);
+				queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 			}
 		}
 	}
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 1d79f6eaa41f..d348656c2f38 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -150,12 +150,12 @@ static int liquidio_set_vf_link_state(struct net_device *netdev, int vfidx,
 static struct handshake handshake[MAX_OCTEON_DEVICES];
 static struct completion first_stage;
 
-static void octeon_droq_bh(struct tasklet_struct *t)
+static void octeon_droq_bh(struct work_struct *work)
 {
 	int q_no;
 	int reschedule = 0;
-	struct octeon_device_priv *oct_priv = from_tasklet(oct_priv, t,
-							  droq_tasklet);
+	struct octeon_device_priv *oct_priv = from_work(oct_priv, work,
+							  droq_bh_work);
 	struct octeon_device *oct = oct_priv->dev;
 
 	for (q_no = 0; q_no < MAX_OCTEON_OUTPUT_QUEUES(oct); q_no++) {
@@ -180,7 +180,7 @@ static void octeon_droq_bh(struct tasklet_struct *t)
 	}
 
 	if (reschedule)
-		tasklet_schedule(&oct_priv->droq_tasklet);
+		queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 }
 
 static int lio_wait_for_oq_pkts(struct octeon_device *oct)
@@ -199,7 +199,7 @@ static int lio_wait_for_oq_pkts(struct octeon_device *oct)
 		}
 		if (pkt_cnt > 0) {
 			pending_pkts += pkt_cnt;
-			tasklet_schedule(&oct_priv->droq_tasklet);
+			queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 		}
 		pkt_cnt = 0;
 		schedule_timeout_uninterruptible(1);
@@ -1130,7 +1130,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 		break;
 	}                       /* end switch (oct->status) */
 
-	tasklet_kill(&oct_priv->droq_tasklet);
+	cancel_work_sync(&oct_priv->droq_bh_work);
 }
 
 /**
@@ -1234,7 +1234,7 @@ static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx)
 	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
 		netif_napi_del(napi);
 
-	tasklet_enable(&oct_priv->droq_tasklet);
+	enable_and_queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 
 	if (atomic_read(&lio->ifstate) & LIO_IFSTATE_REGISTERED)
 		unregister_netdev(netdev);
@@ -1770,7 +1770,7 @@ static int liquidio_open(struct net_device *netdev)
 	int ret = 0;
 
 	if (oct->props[lio->ifidx].napi_enabled == 0) {
-		tasklet_disable(&oct_priv->droq_tasklet);
+		disable_work_sync(&oct_priv->droq_bh_work);
 
 		list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
 			napi_enable(napi);
@@ -1896,7 +1896,7 @@ static int liquidio_stop(struct net_device *netdev)
 		if (OCTEON_CN23XX_PF(oct))
 			oct->droq[0]->ops.poll_mode = 0;
 
-		tasklet_enable(&oct_priv->droq_tasklet);
+		enable_and_queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 	}
 
 	dev_info(&oct->pci_dev->dev, "%s interface is stopped\n", netdev->name);
@@ -4204,9 +4204,9 @@ static int octeon_device_init(struct octeon_device *octeon_dev)
 		}
 	}
 
-	/* Initialize the tasklet that handles output queue packet processing.*/
-	dev_dbg(&octeon_dev->pci_dev->dev, "Initializing droq tasklet\n");
-	tasklet_setup(&oct_priv->droq_tasklet, octeon_droq_bh);
+	/* Initialize the bh work that handles output queue packet processing.*/
+	dev_dbg(&octeon_dev->pci_dev->dev, "Initializing droq bh work\n");
+	INIT_WORK(&oct_priv->droq_bh_work, octeon_droq_bh);
 
 	/* Setup the interrupt handler and record the INT SUM register address
 	 */
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index 62c2eadc33e3..04117625f388 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -87,7 +87,7 @@ static int lio_wait_for_oq_pkts(struct octeon_device *oct)
 		}
 		if (pkt_cnt > 0) {
 			pending_pkts += pkt_cnt;
-			tasklet_schedule(&oct_priv->droq_tasklet);
+			queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 		}
 		pkt_cnt = 0;
 		schedule_timeout_uninterruptible(1);
@@ -584,7 +584,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 		break;
 	}
 
-	tasklet_kill(&oct_priv->droq_tasklet);
+	cancel_work_sync(&oct_priv->droq_bh_work);
 }
 
 /**
@@ -687,7 +687,7 @@ static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx)
 	list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
 		netif_napi_del(napi);
 
-	tasklet_enable(&oct_priv->droq_tasklet);
+	enable_and_queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 
 	if (atomic_read(&lio->ifstate) & LIO_IFSTATE_REGISTERED)
 		unregister_netdev(netdev);
@@ -911,7 +911,7 @@ static int liquidio_open(struct net_device *netdev)
 	int ret = 0;
 
 	if (!oct->props[lio->ifidx].napi_enabled) {
-		tasklet_disable(&oct_priv->droq_tasklet);
+		disable_work_sync(&oct_priv->droq_bh_work);
 
 		list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
 			napi_enable(napi);
@@ -986,7 +986,7 @@ static int liquidio_stop(struct net_device *netdev)
 
 		oct->droq[0]->ops.poll_mode = 0;
 
-		tasklet_enable(&oct_priv->droq_tasklet);
+		enable_and_queue_work(system_bh_wq, &oct_priv->droq_bh_work);
 	}
 
 	cancel_delayed_work_sync(&lio->stats_wk.work);
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
index eef12fdd246d..4e5f8bbc891b 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
@@ -96,7 +96,7 @@ u32 octeon_droq_check_hw_for_pkts(struct octeon_droq *droq)
 	last_count = pkt_count - droq->pkt_count;
 	droq->pkt_count = pkt_count;
 
-	/* we shall write to cnts  at napi irq enable or end of droq tasklet */
+	/* we shall write to cnts  at napi irq enable or end of droq bh_work */
 	if (last_count)
 		atomic_add(last_count, &droq->pkts_pending);
 
@@ -764,7 +764,7 @@ octeon_droq_process_packets(struct octeon_device *oct,
 				(u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 	}
 
-	/* If there are packets pending. schedule tasklet again */
+	/* If there are packets pending. schedule bh_work again */
 	if (atomic_read(&droq->pkts_pending))
 		return 1;
 
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_main.h b/drivers/net/ethernet/cavium/liquidio/octeon_main.h
index 5b4cb725f60f..a8f2a0a7b08e 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_main.h
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_main.h
@@ -24,6 +24,7 @@
 #define  _OCTEON_MAIN_H_
 
 #include <linux/sched/signal.h>
+#include <linux/workqueue.h>
 
 #if BITS_PER_LONG == 32
 #define CVM_CAST64(v) ((long long)(v))
@@ -36,8 +37,7 @@
 #define DRV_NAME "LiquidIO"
 
 struct octeon_device_priv {
-	/** Tasklet structures for this device. */
-	struct tasklet_struct droq_tasklet;
+	struct work_struct droq_bh_work;
 	unsigned long napi_mask;
 	struct octeon_device *dev;
 };
-- 
2.34.1