From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Schiller Subject: [PATCH 5/6] net/lapb: support netdev events Date: Mon, 16 Nov 2020 08:31:48 +0100 Message-ID: <20201116073149.23219-5-ms@dev.tdt.de> References: <20201116073149.23219-1-ms@dev.tdt.de> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20201116073149.23219-1-ms@dev.tdt.de> List-ID: Content-Type: text/plain; charset="us-ascii" 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 This makes it possible to handle carrier loss and detection. In case of Carrier Loss, layer 2 is terminated In case of Carrier Detection, we start timer t1 on a DCE interface, and on a DTE interface we change to state LAPB_STATE_1 and start sending SABM(E). Signed-off-by: Martin Schiller --- net/lapb/lapb_iface.c | 74 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c index 3c03f6512c5f..6a109c8c286f 100644 --- a/net/lapb/lapb_iface.c +++ b/net/lapb/lapb_iface.c @@ -418,14 +418,88 @@ int lapb_data_transmit(struct lapb_cb *lapb, struct= sk_buff *skb) return used; } =20 +/* + * Handle device status changes. + */ +static int lapb_device_event(struct notifier_block *this, unsigned long = event, + void *ptr) +{ + struct net_device *dev =3D ptr; + struct lapb_cb *lapb; + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + if (dev->type =3D=3D ARPHRD_X25) { + switch (event) { + case NETDEV_REGISTER: + lapb_dbg(0, "(%p): got event NETDEV_REGISTER for device: %s\n", dev, = dev->name); + break; + case NETDEV_POST_TYPE_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_POST_TYPE_CHANGE for device: %s\n= ", dev, dev->name); + break; + case NETDEV_UP: + lapb_dbg(0, "(%p): got event NETDEV_UP for device: %s\n", dev, dev->n= ame); + break; + case NETDEV_GOING_DOWN: + lapb_dbg(0, "(%p): got event NETDEV_GOING_DOWN for device: %s\n", dev= , dev->name); + break; + case NETDEV_DOWN: + lapb_dbg(0, "(%p): got event NETDEV_DOWN for device: %s\n", dev, dev-= >name); + break; + case NETDEV_PRE_TYPE_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_PRE_TYPE_CHANGE for device: %s\n"= , dev, dev->name); + break; + case NETDEV_UNREGISTER: + lapb_dbg(0, "(%p): got event NETDEV_UNREGISTER for device: %s\n", dev= , dev->name); + break; + case NETDEV_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_CHANGE for device: %s\n", dev, de= v->name); + lapb =3D lapb_devtostruct(dev); + if (lapb) { + if (!netif_carrier_ok(dev)) { + lapb_dbg(0, "(%p): Carrier lost -> Entering LAPB_STATE_0: %s\n", de= v, dev->name); + lapb_disconnect_indication(lapb, LAPB_OK); + lapb_clear_queues(lapb); + lapb->state =3D LAPB_STATE_0; + lapb->n2count =3D 0; + lapb_stop_t1timer(lapb); + lapb_stop_t2timer(lapb); + } else { + lapb_dbg(0, "(%p): Carrier detected: %s\n", dev, dev->name); + if (lapb->mode & LAPB_DCE) { + lapb_start_t1timer(lapb); + } else { + if (lapb->state =3D=3D LAPB_STATE_0) { + lapb->state =3D LAPB_STATE_1; + lapb_establish_data_link(lapb); + } + } + } + } + break; + } + } + + return NOTIFY_DONE; +} + +static struct notifier_block lapb_dev_notifier =3D { + .notifier_call =3D lapb_device_event, +}; + static int __init lapb_init(void) { + register_netdevice_notifier(&lapb_dev_notifier); + return 0; } =20 static void __exit lapb_exit(void) { WARN_ON(!list_empty(&lapb_list)); + + unregister_netdevice_notifier(&lapb_dev_notifier); } =20 MODULE_AUTHOR("Jonathan Naylor "); --=20 2.20.1