Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Martin Schiller <ms@dev.tdt.de>
To:     andrew.hendry@gmail.com, davem@davemloft.net, kuba@kernel.org,
        xie.he.0141@gmail.com
Cc:     linux-x25@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, Martin Schiller <ms@dev.tdt.de>
Subject: [PATCH 1/6] net/x25: add/remove x25_link_device by NETDEV_REGISTER/UNREGISTER
Date:   Mon, 16 Nov 2020 08:31:44 +0100
Message-ID: <20201116073149.23219-1-ms@dev.tdt.de>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

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 independantly 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>
---
 include/net/x25.h  |  2 ++
 net/x25/af_x25.c   | 19 +++++++++++++++++
 net/x25/x25_link.c | 51 ++++++++++++++++++++++++++++++++++++++++------
 3 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/include/net/x25.h b/include/net/x25.h
index d7d6c2b4ffa7..af841c5ede28 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -231,6 +231,8 @@ int x25_backlog_rcv(struct sock *, struct sk_buff *);
=20
 /* x25_link.c */
 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned sho=
rt);
+void x25_link_device_add(struct net_device *);
+void x25_link_device_remove(struct net_device *);
 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 a10487e7574c..d8e5ca251801 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -233,10 +233,20 @@ 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->nam=
e);
+			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->n=
ame);
 			nb =3D x25_get_neigh(dev);
 			if (nb) {
 				x25_terminate_link(nb);
@@ -244,10 +254,19 @@ 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", d=
ev->name);
+			x25_link_device_remove(dev);
+			break;
+		case NETDEV_UNREGISTER:
+			pr_debug("X.25: got event NETDEV_UNREGISTER for device: %s\n", dev->n=
ame);
+			x25_link_device_remove(dev);
+			break;
 		}
 	}
=20
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index fdae054b7dc1..22055ee40056 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -239,9 +239,19 @@ 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 =3D kmalloc(sizeof(*nb), GFP_ATOMIC);
+	struct x25_neigh *nb =3D x25_get_neigh(dev);
+
+	/*
+	 * Check, if we already have a neighbour for this device
+	 */
+	if (nb) {
+		x25_neigh_put(nb);
+		return;
+	}
+
+	nb =3D kmalloc(sizeof(*nb), GFP_ATOMIC);
=20
 	if (!nb)
 		return;
@@ -268,6 +278,22 @@ void x25_link_device_up(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
=20
+/*
+ *	A device is coming up
+ */
+void x25_link_device_up(struct net_device *dev)
+{
+	struct x25_neigh *nb =3D x25_get_neigh(dev);
+
+	if (!nb)
+		return;
+
+	nb->state =3D 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 +303,6 @@ 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 +312,7 @@ 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 +331,22 @@ void x25_link_device_down(struct net_device *dev)
 	write_unlock_bh(&x25_neigh_list_lock);
 }
=20
+/*
+ *	A device is going down
+ */
+void x25_link_device_down(struct net_device *dev)
+{
+	struct x25_neigh *nb =3D 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.
  */
--=20
2.20.1