netdev - [PATCH net-next v4 3/4] virtio-net: refactor dim initialization/destruction

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Date: Mon,  8 Apr 2024 11:44:29 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: netdev@...r.kernel.org,
	virtualization@...ts.linux.dev
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Ratheesh Kannoth <rkannoth@...vell.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [PATCH net-next v4 3/4] virtio-net: refactor dim initialization/destruction

Extract the initialization and destruction actions
of dim for use in the next patch.

Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
---
 drivers/net/virtio_net.c | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index e709d44..cc3a281 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2278,6 +2278,13 @@ static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
 	return err;
 }
 
+static void virtnet_dim_clean(struct virtnet_info *vi,
+			      int start_qnum, int end_qnum)
+{
+	for (; start_qnum <= end_qnum; start_qnum++)
+		cancel_work_sync(&vi->rq[start_qnum].dim.work);
+}
+
 static int virtnet_open(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
@@ -2301,11 +2308,9 @@ static int virtnet_open(struct net_device *dev)
 err_enable_qp:
 	disable_delayed_refill(vi);
 	cancel_delayed_work_sync(&vi->refill);
-
-	for (i--; i >= 0; i--) {
+	virtnet_dim_clean(vi, 0, i - 1);
+	for (i--; i >= 0; i--)
 		virtnet_disable_queue_pair(vi, i);
-		cancel_work_sync(&vi->rq[i].dim.work);
-	}
 
 	return err;
 }
@@ -2470,7 +2475,7 @@ static int virtnet_rx_resize(struct virtnet_info *vi,
 
 	if (running) {
 		napi_disable(&rq->napi);
-		cancel_work_sync(&rq->dim.work);
+		virtnet_dim_clean(vi, qindex, qindex);
 	}
 
 	err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_unmap_free_buf);
@@ -2720,10 +2725,9 @@ static int virtnet_close(struct net_device *dev)
 	/* Make sure refill_work doesn't re-enable napi! */
 	cancel_delayed_work_sync(&vi->refill);
 
-	for (i = 0; i < vi->max_queue_pairs; i++) {
+	virtnet_dim_clean(vi, 0, vi->max_queue_pairs - 1);
+	for (i = 0; i < vi->max_queue_pairs; i++)
 		virtnet_disable_queue_pair(vi, i);
-		cancel_work_sync(&vi->rq[i].dim.work);
-	}
 
 	return 0;
 }
@@ -4422,6 +4426,19 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
 	return ret;
 }
 
+static void virtnet_dim_init(struct virtnet_info *vi)
+{
+	int i;
+
+	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
+		return;
+
+	for (i = 0; i < vi->max_queue_pairs; i++) {
+		INIT_WORK(&vi->rq[i].dim.work, virtnet_rx_dim_work);
+		vi->rq[i].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+	}
+}
+
 static int virtnet_alloc_queues(struct virtnet_info *vi)
 {
 	int i;
@@ -4441,6 +4458,7 @@ static int virtnet_alloc_queues(struct virtnet_info *vi)
 		goto err_rq;
 
 	INIT_DELAYED_WORK(&vi->refill, refill_work);
+	virtnet_dim_init(vi);
 	for (i = 0; i < vi->max_queue_pairs; i++) {
 		vi->rq[i].pages = NULL;
 		netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll,
@@ -4449,9 +4467,6 @@ static int virtnet_alloc_queues(struct virtnet_info *vi)
 					 virtnet_poll_tx,
 					 napi_tx ? napi_weight : 0);
 
-		INIT_WORK(&vi->rq[i].dim.work, virtnet_rx_dim_work);
-		vi->rq[i].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
-
 		sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
 		ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
 		sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
-- 
1.8.3.1