netdev - [PATCH] net: add net device refcount tracker to pneigh

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Date: Fri, 4 Aug 2023 16:57:46 +0800 (CST)
From: <yang.yang29@....com.cn>
To: <davem@...emloft.net>
Cc: <dsahern@...nel.org>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] net: add net device refcount tracker to pneigh_queue

From: xu xin <xu.xin16@....com.cn>

Add a static net device refcount tracker to neighbour.c to track
dev's refcnt when pneigh enqueuing and dequeuing.

Signed-off-by: xu xin <xu.xin16@....com.cn>
Reviewed-by: Yang Yang <yang.yang.29@....com.cn>
Cc: Kuang Mingfu <kuang.mingfu@....com.cn>
---
 net/core/neighbour.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index ddd0f32de20e..56e87130fa95 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -61,6 +61,7 @@ static int pneigh_ifdown_and_unlock(struct neigh_table *tbl,
 static const struct seq_operations neigh_stat_seq_ops;
 #endif

+static netdevice_tracker pneigh_queue_dev_tracker;
 /*
    Neighbour hash table buckets are protected with rwlock tbl->lock.

@@ -364,7 +365,7 @@ static void pneigh_queue_purge(struct sk_buff_head *list, struct net *net,
 	spin_unlock_irqrestore(&list->lock, flags);

 	while ((skb = __skb_dequeue(&tmp))) {
-		dev_put(skb->dev);
+		netdev_put(skb->dev, &pneigh_queue_dev_tracker);
 		kfree_skb(skb);
 	}
 }
@@ -1633,7 +1634,7 @@ static void neigh_proxy_process(struct timer_list *t)
 				kfree_skb(skb);
 			}

-			dev_put(dev);
+			netdev_put(skb->dev, &pneigh_queue_dev_tracker);
 		} else if (!sched_next || tdif < sched_next)
 			sched_next = tdif;
 	}
@@ -1673,7 +1674,7 @@ void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
 			sched_next = tbl->proxy_timer.expires;
 	}
 	skb_dst_drop(skb);
-	dev_hold(skb->dev);
+	netdev_hold(skb->dev, &pneigh_queue_dev_tracker, GFP_KERNEL);
 	__skb_queue_tail(&tbl->proxy_queue, skb);
 	p->qlen++;
 	mod_timer(&tbl->proxy_timer, sched_next);
-- 
2.15.2