[PATCH v3 1/2] net: core: Notify on changes to dev->promiscuity.

[Horatiu Vultur]

Add the SWITCHDEV_ATTR_ID_PORT_PROMISCUITY switchdev notification type,
used to indicate whenever the dev promiscuity counter is changed.

The notification doesn't use any switchdev_attr attribute because in the
notifier callbacks is it possible to get the dev and read directly
the promiscuity value.

Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
---
 include/net/switchdev.h | 1 +
 net/core/dev.c          | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index aee86a1..14b1617 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -40,6 +40,7 @@ enum switchdev_attr_id {
 	SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 	SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
 	SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
+	SWITCHDEV_ATTR_ID_PORT_PROMISCUITY,
 };
 
 struct switchdev_attr {
diff --git a/net/core/dev.c b/net/core/dev.c
index 49589ed..40c74f2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -142,6 +142,7 @@
 #include <linux/net_namespace.h>
 #include <linux/indirect_call_wrapper.h>
 #include <net/devlink.h>
+#include <net/switchdev.h>
 
 #include "net-sysfs.h"
 
@@ -7377,6 +7378,11 @@ static void dev_change_rx_flags(struct net_device *dev, int flags)
 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
 {
 	unsigned int old_flags = dev->flags;
+	struct switchdev_attr attr = {
+		.orig_dev = dev,
+		.id = SWITCHDEV_ATTR_ID_PORT_PROMISCUITY,
+		.flags = SWITCHDEV_F_DEFER,
+	};
 	kuid_t uid;
 	kgid_t gid;
 
@@ -7419,6 +7425,9 @@ static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
 	}
 	if (notify)
 		__dev_notify_flags(dev, old_flags, IFF_PROMISC);
+
+	switchdev_port_attr_set(dev, &attr);
+
 	return 0;
 }
 
-- 
2.7.4