netdev - [PATCH v2 net-next 5/8] ionic: add per-queue napi

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Date: Tue, 18 Jun 2024 17:32:54 -0700
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>, <David.Laight@...LAB.COM>,
	<andrew@...n.ch>
CC: <brett.creeley@....com>, <drivers@...sando.io>, Shannon Nelson
	<shannon.nelson@....com>
Subject: [PATCH v2 net-next 5/8] ionic: add per-queue napi_schedule for doorbell check

Add a work item for each queue that will be run on the queue's
preferred cpu and will schedule another napi.  This napi is
run in case the device missed a doorbell and didn't process
a packet.  This is a problem for the Elba asic that happens
very rarely.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 .../net/ethernet/pensando/ionic/ionic_dev.c   | 23 +++++++++++++++++--
 .../net/ethernet/pensando/ionic/ionic_dev.h   |  1 +
 .../net/ethernet/pensando/ionic/ionic_lif.c   |  2 ++
 .../net/ethernet/pensando/ionic/ionic_lif.h   |  1 +
 4 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index 5d5990e7376e..56e7c120d492 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -54,6 +54,13 @@ static void ionic_napi_schedule_do_softirq(struct napi_struct *napi)
 	local_bh_enable();
 }
 
+void ionic_doorbell_napi_work(struct work_struct *work)
+{
+	struct ionic_qcq *qcq = container_of(work, struct ionic_qcq,
+					     doorbell_napi_work);
+	ionic_napi_schedule_do_softirq(&qcq->napi);
+}
+
 static int ionic_get_preferred_cpu(struct ionic *ionic,
 				   struct ionic_intr_info *intr)
 {
@@ -66,6 +73,18 @@ static int ionic_get_preferred_cpu(struct ionic *ionic,
 	return cpu;
 }
 
+static void ionic_queue_dbell_napi_work(struct ionic *ionic,
+					struct ionic_qcq *qcq)
+{
+	int cpu;
+
+	if (!(qcq->flags & IONIC_QCQ_F_INTR))
+		return;
+
+	cpu = ionic_get_preferred_cpu(ionic, &qcq->intr);
+	queue_work_on(cpu, ionic->wq, &qcq->doorbell_napi_work);
+}
+
 static void ionic_doorbell_check_dwork(struct work_struct *work)
 {
 	struct ionic *ionic = container_of(work, struct ionic,
@@ -86,8 +105,8 @@ static void ionic_doorbell_check_dwork(struct work_struct *work)
 		int i;
 
 		for (i = 0; i < lif->nxqs; i++) {
-			ionic_napi_schedule_do_softirq(&lif->txqcqs[i]->napi);
-			ionic_napi_schedule_do_softirq(&lif->rxqcqs[i]->napi);
+			ionic_queue_dbell_napi_work(ionic, lif->txqcqs[i]);
+			ionic_queue_dbell_napi_work(ionic, lif->rxqcqs[i]);
 		}
 
 		if (lif->hwstamp_txq &&
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index d87e6020cfb1..92f16b6c5662 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -386,6 +386,7 @@ bool ionic_q_is_posted(struct ionic_queue *q, unsigned int pos);
 
 int ionic_heartbeat_check(struct ionic *ionic);
 bool ionic_is_fw_running(struct ionic_dev *idev);
+void ionic_doorbell_napi_work(struct work_struct *work);
 void ionic_queue_doorbell_check(struct ionic *ionic, int delay);
 
 bool ionic_adminq_poke_doorbell(struct ionic_queue *q);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 42a587d14d01..d7abfbe05f2b 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -344,6 +344,7 @@ static int ionic_qcq_disable(struct ionic_lif *lif, struct ionic_qcq *qcq, int f
 	if (qcq->flags & IONIC_QCQ_F_INTR) {
 		struct ionic_dev *idev = &lif->ionic->idev;
 
+		cancel_work_sync(&qcq->doorbell_napi_work);
 		cancel_work_sync(&qcq->dim.work);
 		ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
 				IONIC_INTR_MASK_SET);
@@ -690,6 +691,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
 
 	INIT_WORK(&new->dim.work, ionic_dim_work);
 	new->dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_CQE;
+	INIT_WORK(&new->doorbell_napi_work, ionic_doorbell_napi_work);
 
 	*qcq = new;
 
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index e4a5ae70793e..40b28d0b858f 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -88,6 +88,7 @@ struct ionic_qcq {
 	struct ionic_cq cq;
 	struct napi_struct napi;
 	struct ionic_intr_info intr;
+	struct work_struct doorbell_napi_work;
 	struct dentry *dentry;
 };
 
-- 
2.17.1