Subject: [PATCH net-next v2 8/8] netdev: depend on netdev->lock for qstats in ops locked drivers

From: Jakub Kicinski <[email-masked]>
Date: Tue, 8 Apr 2025 12:59:55 -0700

We mostly needed rtnl_lock in qstat to make sure the queue count
is stable while we work. For "ops locked" drivers the instance
lock protects the queue count, so we don't have to take rtnl_lock.

For currently ops-locked drivers: netdevsim and bnxt need
the protection from netdev going down while we dump, which
instance lock provides. gve doesn't care.

Reviewed-by: Joe Damato <[email-masked]>
Acked-by: Stanislav Fomichev <[email-masked]>
Signed-off-by: Jakub Kicinski <[email-masked]>
---
 Documentation/networking/netdevices.rst |  6 +++++
 include/net/netdev_queues.h             |  4 +++-
 net/core/netdev-genl.c                  | 29 +++++++++++++++----------
 3 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/Documentation/networking/netdevices.rst b/Documentation/networking/netdevices.rst
index 7ae28c5fb835..0ccc7dcf4390 100644
--- a/Documentation/networking/netdevices.rst
+++ b/Documentation/networking/netdevices.rst
@@ -356,6 +356,12 @@ Similarly to ``ndos`` the instance lock is only held for select drivers.
 For "ops locked" drivers all ethtool ops without exceptions should
 be called under the instance lock.
 
+struct netdev_stat_ops
+----------------------
+
+"qstat" ops are invoked under the instance lock for "ops locked" drivers,
+and under rtnl_lock for all other drivers.
+
 struct net_shaper_ops
 ---------------------
 
diff --git a/include/net/netdev_queues.h b/include/net/netdev_queues.h
index 825141d675e5..ea709b59d827 100644
--- a/include/net/netdev_queues.h
+++ b/include/net/netdev_queues.h
@@ -85,9 +85,11 @@ struct netdev_queue_stats_tx {
  * for some of the events is not maintained, and reliable "total" cannot
  * be provided).
  *
+ * Ops are called under the instance lock if netdev_need_ops_lock()
+ * returns true, otherwise under rtnl_lock.
  * Device drivers can assume that when collecting total device stats,
  * the @get_base_stats and subsequent per-queue calls are performed
- * "atomically" (without releasing the rtnl_lock).
+ * "atomically" (without releasing the relevant lock).
  *
  * Device drivers are encouraged to reset the per-queue statistics when
  * number of queues change. This is because the primary use case for
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 8c58261de969..b64c614a00c4 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -795,26 +795,31 @@ int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
 	if (info->attrs[NETDEV_A_QSTATS_IFINDEX])
 		ifindex = nla_get_u32(info->attrs[NETDEV_A_QSTATS_IFINDEX]);
 
-	rtnl_lock();
 	if (ifindex) {
-		netdev = __dev_get_by_index(net, ifindex);
-		if (netdev && netdev->stat_ops) {
+		netdev = netdev_get_by_index_lock_ops_compat(net, ifindex);
+		if (!netdev) {
+			NL_SET_BAD_ATTR(info->extack,
+					info->attrs[NETDEV_A_QSTATS_IFINDEX]);
+			return -ENODEV;
+		}
+		if (netdev->stat_ops) {
 			err = netdev_nl_qstats_get_dump_one(netdev, scope, skb,
 							    info, ctx);
 		} else {
 			NL_SET_BAD_ATTR(info->extack,
 					info->attrs[NETDEV_A_QSTATS_IFINDEX]);
-			err = netdev ? -EOPNOTSUPP : -ENODEV;
-		}
-	} else {
-		for_each_netdev_dump(net, netdev, ctx->ifindex) {
-			err = netdev_nl_qstats_get_dump_one(netdev, scope, skb,
-							    info, ctx);
-			if (err < 0)
-				break;
+			err = -EOPNOTSUPP;
 		}
+		netdev_unlock_ops_compat(netdev);
+		return err;
+	}
+
+	for_each_netdev_lock_ops_compat_scoped(net, netdev, ctx->ifindex) {
+		err = netdev_nl_qstats_get_dump_one(netdev, scope, skb,
+						    info, ctx);
+		if (err < 0)
+			break;
 	}
-	rtnl_unlock();
 
 	return err;
 }
-- 
2.49.0