netdev - [PATCH v6 net-next 06/15] net-shapers: implement delete support for NODE scope shaper

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Message-ID: <6ce5659240b0f0eb24c8afff4a0611659b089bed.1725457317.git.pabeni@redhat.com>
Date: Wed,  4 Sep 2024 15:53:38 +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
Subject: [PATCH v6 net-next 06/15] net-shapers: implement delete support for NODE scope shaper

Leverage the previously introduced group operation to implement
the removal of NODE scope shaper, re-linking its leaves under the
the parent node before actually deleting the specified NODE scope
shaper.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
v4 -> v5:
 - replace net_device* with binding* in most helpers
---
 net/shaper/shaper.c | 87 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 75 insertions(+), 12 deletions(-)

diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index c409acbe768c..1255d532b36a 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -804,7 +804,8 @@ static int net_shaper_parent_from_leaves(int leaves_count,
 }
 
 static int __net_shaper_group(struct net_shaper_binding *binding,
-			      int leaves_count, struct net_shaper *leaves,
+			      bool update_node, int leaves_count,
+			      struct net_shaper *leaves,
 			      struct net_shaper *node,
 			      struct netlink_ext_ack *extack)
 {
@@ -848,12 +849,14 @@ static int __net_shaper_group(struct net_shaper_binding *binding,
 		}
 	}
 
-	/* For newly created node scope shaper, the following will update
-	 * the handle, due to id allocation.
-	 */
-	ret = net_shaper_pre_insert(binding, &node->handle, extack);
-	if (ret)
-		return ret;
+	if (update_node) {
+		/* For newly created node scope shaper, the following will
+		 * update the handle, due to id allocation.
+		 */
+		ret = net_shaper_pre_insert(binding, &node->handle, extack);
+		if (ret)
+			return ret;
+	}
 
 	for (i = 0; i < leaves_count; ++i) {
 		leaf_handle = leaves[i].handle;
@@ -878,7 +881,8 @@ static int __net_shaper_group(struct net_shaper_binding *binding,
 
 	if (parent)
 		parent->leaves++;
-	net_shaper_commit(binding, 1, node);
+	if (update_node)
+		net_shaper_commit(binding, 1, node);
 	net_shaper_commit(binding, leaves_count, leaves);
 	return 0;
 
@@ -887,6 +891,64 @@ static int __net_shaper_group(struct net_shaper_binding *binding,
 	return ret;
 }
 
+static int net_shaper_pre_del_node(struct net_shaper_binding *binding,
+				   const struct net_shaper *shaper,
+				   struct netlink_ext_ack *extack)
+{
+	struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding);
+	struct net_shaper *cur, *leaves, node = {};
+	int ret, leaves_count = 0;
+	unsigned long index;
+	bool update_node;
+
+	if (!shaper->leaves)
+		return 0;
+
+	/* Fetch the new node information. */
+	node.handle = shaper->parent;
+	cur = net_shaper_lookup(binding, &node.handle);
+	if (cur) {
+		node = *cur;
+	} else {
+		/* A scope NODE shaper can be nested only to the NETDEV scope
+		 * shaper without creating the latter, this check may fail only
+		 * if the data is in inconsistent status.
+		 */
+		if (WARN_ON_ONCE(node.handle.scope != NET_SHAPER_SCOPE_NETDEV))
+			return -EINVAL;
+	}
+
+	leaves = kcalloc(shaper->leaves, sizeof(struct net_shaper),
+			 GFP_KERNEL);
+	if (!leaves)
+		return -ENOMEM;
+
+	/* Build the leaves arrays. */
+	xa_for_each(&hierarchy->shapers, index, cur) {
+		if (net_shaper_handle_cmp(&cur->parent, &shaper->handle))
+			continue;
+
+		if (WARN_ON_ONCE(leaves_count == shaper->leaves)) {
+			ret = -EINVAL;
+			goto free;
+		}
+
+		leaves[leaves_count++] = *cur;
+	}
+
+	/* When re-linking to the netdev shaper, avoid the eventual, implicit,
+	 * creation of the new node, would be surprising since the user is
+	 * doing a delete operation.
+	 */
+	update_node = node.handle.scope != NET_SHAPER_SCOPE_NETDEV;
+	ret = __net_shaper_group(binding, update_node, leaves_count,
+				 leaves, &node, extack);
+
+free:
+	kfree(leaves);
+	return ret;
+}
+
 static int net_shaper_delete(struct net_shaper_binding *binding,
 			     const struct net_shaper_handle *handle,
 			     struct netlink_ext_ack *extack)
@@ -910,9 +972,9 @@ static int net_shaper_delete(struct net_shaper_binding *binding,
 	}
 
 	if (handle->scope == NET_SHAPER_SCOPE_NODE) {
-		/* TODO: implement support for scope NODE delete. */
-		ret = -EINVAL;
-		goto unlock;
+		ret = net_shaper_pre_del_node(binding, shaper, extack);
+		if (ret)
+			goto unlock;
 	}
 
 	ret = __net_shaper_delete(binding, shaper, extack);
@@ -977,7 +1039,8 @@ static int net_shaper_group(struct net_shaper_binding *binding,
 		}
 	}
 
-	ret = __net_shaper_group(binding, leaves_count, leaves, node, extack);
+	ret = __net_shaper_group(binding, true, leaves_count, leaves, node,
+				 extack);
 
 	/* Check if we need to delete any nde left alone by the new leaves
 	 * linkage.
-- 
2.45.2