net: make default_rps_mask a per netns attribute

That really was meant to be a per netns attribute from the beginning.

The idea is that once proper isolation is in place in the main
namespace, additional demux in the child namespaces will be redundant.
Let's make child netns default rps mask empty by default.

To avoid bloating the netns with a possibly large cpumask, allocate
it on-demand during the first write operation.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 7 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index e20784b6f873..15e3f4606b5f 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1060,6 +1060,18 @@ static const struct kobj_type rx_queue_ktype = {
 	.get_ownership = rx_queue_get_ownership,
 };
 
+static int rx_queue_default_mask(struct net_device *dev,
+				 struct netdev_rx_queue *queue)
+{
+#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
+	struct cpumask *rps_default_mask = READ_ONCE(dev_net(dev)->core.rps_default_mask);
+
+	if (rps_default_mask && !cpumask_empty(rps_default_mask))
+		return netdev_rx_queue_set_rps_mask(queue, rps_default_mask);
+#endif
+	return 0;
+}
+
 static int rx_queue_add_kobject(struct net_device *dev, int index)
 {
 	struct netdev_rx_queue *queue = dev->_rx + index;
@@ -1083,13 +1095,10 @@ static int rx_queue_add_kobject(struct net_device *dev, int index)
 			goto err;
 	}
 
-#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
-	if (!cpumask_empty(&rps_default_mask)) {
-		error = netdev_rx_queue_set_rps_mask(queue, &rps_default_mask);
-		if (error)
-			goto err;
-	}
-#endif
+	error = rx_queue_default_mask(dev, queue);
+	if (error)
+		goto err;
+
 	kobject_uevent(kobj, KOBJ_ADD);
 
 	return error;