diff mbox series

[net-next,v2,1/6] net/x25: handle additional netdev events

Message ID 20201116135522.21791-2-ms@dev.tdt.de (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series netdev event handling + neighbour config | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/kdoc success Errors and warnings before: 5 this patch: 5
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 130 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/header_inline success Link
netdev/stable success Stable not CCed

Commit Message

Martin Schiller Nov. 16, 2020, 1:55 p.m. UTC 
Add / remove x25_link_device by NETDEV_REGISTER/UNREGISTER and also by
NETDEV_POST_TYPE_CHANGE/NETDEV_PRE_TYPE_CHANGE.

This change is needed so that the x25_neigh struct for an interface is
already created when it shows up and is kept independently if the
interface goes UP or DOWN.

This is used in the next commit, where x25 params of an neighbour will
get configurable through ioctls.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---

Change from v1:
fix 'subject_prefix' and 'checkpatch' warnings

---
 include/net/x25.h  |  2 ++
 net/x25/af_x25.c   | 26 ++++++++++++++++++++++++++
 net/x25/x25_link.c | 45 +++++++++++++++++++++++++++++++++++++++------
 3 files changed, 67 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/include/net/x25.h b/include/net/x25.h
index d7d6c2b4ffa7..4c1502e8b2b2 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -231,6 +231,8 @@  int x25_backlog_rcv(struct sock *, struct sk_buff *);
 
 /* x25_link.c */
 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
+void x25_link_device_add(struct net_device *dev);
+void x25_link_device_remove(struct net_device *dev);
 void x25_link_device_up(struct net_device *);
 void x25_link_device_down(struct net_device *);
 void x25_link_established(struct x25_neigh *);
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 046d3fee66a9..d2a52c254cca 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -233,10 +233,24 @@  static int x25_device_event(struct notifier_block *this, unsigned long event,
 #endif
 	 ) {
 		switch (event) {
+		case NETDEV_REGISTER:
+			pr_debug("X.25: got event NETDEV_REGISTER for device: %s\n",
+				 dev->name);
+			x25_link_device_add(dev);
+			break;
+		case NETDEV_POST_TYPE_CHANGE:
+			pr_debug("X.25: got event NETDEV_POST_TYPE_CHANGE for device: %s\n",
+				 dev->name);
+			x25_link_device_add(dev);
+			break;
 		case NETDEV_UP:
+			pr_debug("X.25: got event NETDEV_UP for device: %s\n",
+				 dev->name);
 			x25_link_device_up(dev);
 			break;
 		case NETDEV_GOING_DOWN:
+			pr_debug("X.25: got event NETDEV_GOING_DOWN for device: %s\n",
+				 dev->name);
 			nb = x25_get_neigh(dev);
 			if (nb) {
 				x25_terminate_link(nb);
@@ -244,10 +258,22 @@  static int x25_device_event(struct notifier_block *this, unsigned long event,
 			}
 			break;
 		case NETDEV_DOWN:
+			pr_debug("X.25: got event NETDEV_DOWN for device: %s\n",
+				 dev->name);
 			x25_kill_by_device(dev);
 			x25_route_device_down(dev);
 			x25_link_device_down(dev);
 			break;
+		case NETDEV_PRE_TYPE_CHANGE:
+			pr_debug("X.25: got event NETDEV_PRE_TYPE_CHANGE for device: %s\n",
+				 dev->name);
+			x25_link_device_remove(dev);
+			break;
+		case NETDEV_UNREGISTER:
+			pr_debug("X.25: got event NETDEV_UNREGISTER for device: %s\n",
+				 dev->name);
+			x25_link_device_remove(dev);
+			break;
 		}
 	}
 
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index fdae054b7dc1..92828a8a4ada 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -239,9 +239,17 @@  void x25_link_terminated(struct x25_neigh *nb)
 /*
  *	Add a new device.
  */
-void x25_link_device_up(struct net_device *dev)
+void x25_link_device_add(struct net_device *dev)
 {
-	struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	/* Check, if we already have a neighbour for this device */
+	if (nb) {
+		x25_neigh_put(nb);
+		return;
+	}
+
+	nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
 
 	if (!nb)
 		return;
@@ -268,6 +276,20 @@  void x25_link_device_up(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
 
+/* A device is coming up */
+void x25_link_device_up(struct net_device *dev)
+{
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	if (!nb)
+		return;
+
+	nb->state = X25_LINK_STATE_1;
+	x25_establish_link(nb);
+
+	x25_neigh_put(nb);
+}
+
 /**
  *	__x25_remove_neigh - remove neighbour from x25_neigh_list
  *	@nb: - neigh to remove
@@ -277,9 +299,6 @@  void x25_link_device_up(struct net_device *dev)
  */
 static void __x25_remove_neigh(struct x25_neigh *nb)
 {
-	skb_queue_purge(&nb->queue);
-	x25_stop_t20timer(nb);
-
 	if (nb->node.next) {
 		list_del(&nb->node);
 		x25_neigh_put(nb);
@@ -289,7 +308,7 @@  static void __x25_remove_neigh(struct x25_neigh *nb)
 /*
  *	A device has been removed, remove its links.
  */
-void x25_link_device_down(struct net_device *dev)
+void x25_link_device_remove(struct net_device *dev)
 {
 	struct x25_neigh *nb;
 	struct list_head *entry, *tmp;
@@ -308,6 +327,20 @@  void x25_link_device_down(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
 
+/* A device is going down */
+void x25_link_device_down(struct net_device *dev)
+{
+	struct x25_neigh *nb = x25_get_neigh(dev);
+
+	if (!nb)
+		return;
+
+	skb_queue_purge(&nb->queue);
+	x25_stop_t20timer(nb);
+
+	x25_neigh_put(nb);
+}
+
 /*
  *	Given a device, return the neighbour address.
  */