netdev - [PATCH v8 net-next 07/15] net-shapers: implement shaper cleanup on queue deletion

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Message-ID: <094ea42117070aaacff25145b23feadef53dbfbc.1727704215.git.pabeni@redhat.com>
Date: Mon, 30 Sep 2024 15:53:54 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Madhu Chittim <madhu.chittim@...el.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Simon Horman <horms@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Sunil Kovvuri Goutham <sgoutham@...vell.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Donald Hunter <donald.hunter@...il.com>,
	anthony.l.nguyen@...el.com,
	przemyslaw.kitszel@...el.com,
	intel-wired-lan@...ts.osuosl.org,
	edumazet@...gle.com,
	Stanislav Fomichev <stfomichev@...il.com>
Subject: [PATCH v8 net-next 07/15] net-shapers: implement shaper cleanup on queue deletion

hook into netif_set_real_num_tx_queues() to cleanup any shaper
configured on top of the to-be-destroyed TX queues.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
v6 -> v7:
 - don't touch the H/W for the queue shaper, the driver
   is supposed to reset clean it up.
 - it's up to the net shaper enabled caller to acquire the
   dev lock
---
 net/core/dev.c      |  2 ++
 net/core/dev.h      |  4 ++++
 net/shaper/shaper.c | 48 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 1e19797d8edd..35c159161b9f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2949,6 +2949,8 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
 		if (dev->num_tc)
 			netif_setup_tc(dev, txq);
 
+		net_shaper_set_real_num_tx_queues(dev, txq);
+
 		dev_qdisc_change_real_num_tx(dev, txq);
 
 		dev->real_num_tx_queues = txq;
diff --git a/net/core/dev.h b/net/core/dev.h
index 13c558874af3..d3ea92949ff3 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -37,8 +37,12 @@ void dev_addr_check(struct net_device *dev);
 
 #if IS_ENABLED(CONFIG_NET_SHAPER)
 void net_shaper_flush_netdev(struct net_device *dev);
+void net_shaper_set_real_num_tx_queues(struct net_device *dev,
+				       unsigned int txq);
 #else
 static inline void net_shaper_flush_netdev(struct net_device *dev) {}
+static inline void net_shaper_set_real_num_tx_queues(struct net_device *dev,
+						     unsigned int txq) {}
 #endif
 
 /* sysctls not referred to from outside net/core/ */
diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index ddd1999b3f27..85ad172833fc 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -1157,6 +1157,54 @@ void net_shaper_flush_netdev(struct net_device *dev)
 	net_shaper_flush(&binding);
 }
 
+void net_shaper_set_real_num_tx_queues(struct net_device *dev,
+				       unsigned int txq)
+{
+	struct net_shaper_hierarchy *hierarchy;
+	struct net_shaper_binding binding;
+	int i;
+
+	binding.type = NET_SHAPER_BINDING_TYPE_NETDEV;
+	binding.netdev = dev;
+	hierarchy = net_shaper_hierarchy(&binding);
+	if (!hierarchy)
+		return;
+
+	/* Only drivers implementing shapers support ensure
+	 * the lock is acquired in advance.
+	 */
+	lockdep_assert_held(&dev->lock);
+
+	/* Take action only when decreasing the tx queue number. */
+	for (i = txq; i < dev->real_num_tx_queues; ++i) {
+		struct net_shaper_handle handle, parent_handle;
+		struct net_shaper *shaper;
+		u32 index;
+
+		handle.scope = NET_SHAPER_SCOPE_QUEUE;
+		handle.id = i;
+		shaper = net_shaper_lookup(&binding, &handle);
+		if (!shaper)
+			continue;
+
+		/* Don't touch the H/W for the queue shaper, the drivers already
+		 * deleted the queue and related resources.
+		 */
+		parent_handle = shaper->parent;
+		index = net_shaper_handle_to_index(&handle);
+		xa_erase(&hierarchy->shapers, index);
+		kfree_rcu(shaper, rcu);
+
+		/* The recursion on parent does the full job. */
+		if (parent_handle.scope != NET_SHAPER_SCOPE_NODE)
+			continue;
+
+		shaper = net_shaper_lookup(&binding, &parent_handle);
+		if (shaper && !--shaper->leaves)
+			__net_shaper_delete(&binding, shaper, NULL);
+	}
+}
+
 static int __init shaper_init(void)
 {
 	return genl_register_family(&net_shaper_nl_family);
-- 
2.45.2