linux-kernel - [PATCH v2 8/8] net: register debugfs file for net

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Message-Id: <20250415-reftrack-dbgfs-v2-8-b18c4abd122f@kernel.org>
Date: Tue, 15 Apr 2025 14:49:46 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>, Qasim Ijaz <qasdev00@...il.com>, 
 Nathan Chancellor <nathan@...nel.org>, Andrew Lunn <andrew@...n.ch>, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v2 8/8] net: register debugfs file for net_device refcnt
 tracker

As a nearly-final step in register_netdevice(), finalize the name in the
refcount tracker, and register a debugfs file for it.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 net/core/dev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 2f7f5fd9ffec7c0fc219eb6ba57d57a55134186e..a87488e127ed13fded156023de676851826a1a8f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10834,8 +10834,9 @@ static void netdev_free_phy_link_topology(struct net_device *dev)
  */
 int register_netdevice(struct net_device *dev)
 {
-	int ret;
 	struct net *net = dev_net(dev);
+	char name[64];
+	int ret;

 	BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
 		     NETDEV_FEATURE_COUNT);
@@ -10994,6 +10995,9 @@ int register_netdevice(struct net_device *dev)
 	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
 		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);

+	/* Register debugfs file for the refcount tracker */
+	if (snprintf(name, sizeof(name), "netdev-%s@%p", dev->name, dev) < sizeof(name))
+		ref_tracker_dir_debugfs(&dev->refcnt_tracker, name);
 out:
 	return ret;

-- 
2.49.0