netdev - [PATCH v3 net-next 22/23] ipmr, ip6mr: add net device refcount tracker to struct vif

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Message-Id: <20211205042217.982127-23-eric.dumazet@gmail.com>
Date:   Sat,  4 Dec 2021 20:22:16 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH v3 net-next 22/23] ipmr, ip6mr: add net device refcount tracker to struct vif_device

From: Eric Dumazet <edumazet@...gle.com>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/mroute_base.h | 2 ++
 net/ipv4/ipmr.c             | 3 ++-
 net/ipv6/ip6mr.c            | 3 ++-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/mroute_base.h b/include/linux/mroute_base.h
index 8071148f29a6ec6a95df7e74bbfdeab5b5f6a644..e05ee9f001ffbf30f7b26ab5555e2db5cc058560 100644
--- a/include/linux/mroute_base.h
+++ b/include/linux/mroute_base.h
@@ -12,6 +12,7 @@
 /**
  * struct vif_device - interface representor for multicast routing
  * @dev: network device being used
+ * @dev_tracker: refcount tracker for @dev reference
  * @bytes_in: statistic; bytes ingressing
  * @bytes_out: statistic; bytes egresing
  * @pkt_in: statistic; packets ingressing
@@ -26,6 +27,7 @@
  */
 struct vif_device {
 	struct net_device *dev;
+	netdevice_tracker dev_tracker;
 	unsigned long bytes_in, bytes_out;
 	unsigned long pkt_in, pkt_out;
 	unsigned long rate_limit;
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 2dda856ca260259e5626577e2b2993a6d9967aa6..4c7aca884fa9a35816008a5f3a1a58dd1baf6c06 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -696,7 +696,7 @@ static int vif_delete(struct mr_table *mrt, int vifi, int notify,
 	if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
 		unregister_netdevice_queue(dev, head);
 
-	dev_put(dev);
+	dev_put_track(dev, &v->dev_tracker);
 	return 0;
 }
 
@@ -896,6 +896,7 @@ static int vif_add(struct net *net, struct mr_table *mrt,
 	/* And finish update writing critical data */
 	write_lock_bh(&mrt_lock);
 	v->dev = dev;
+	netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
 	if (v->flags & VIFF_REGISTER)
 		mrt->mroute_reg_vif_num = vifi;
 	if (vifi+1 > mrt->maxvif)
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 36ed9efb88254003720549da52f39b11e9bf911f..a77a15a7f3dcb61c53a86e055b8a1507d9d591f8 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -746,7 +746,7 @@ static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
 	if ((v->flags & MIFF_REGISTER) && !notify)
 		unregister_netdevice_queue(dev, head);
 
-	dev_put(dev);
+	dev_put_track(dev, &v->dev_tracker);
 	return 0;
 }
 
@@ -919,6 +919,7 @@ static int mif6_add(struct net *net, struct mr_table *mrt,
 	/* And finish update writing critical data */
 	write_lock_bh(&mrt_lock);
 	v->dev = dev;
+	netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
 #ifdef CONFIG_IPV6_PIMSM_V2
 	if (v->flags & MIFF_REGISTER)
 		mrt->mroute_reg_vif_num = vifi;
-- 
2.34.1.400.ga245620fadb-goog