Merge tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - support "prefer busy polling" NAPI operation mode, where we defer
     softirq for some time expecting applications to periodically busy
     poll

   - AF_XDP: improve efficiency by more batching and hindering the
     adjacency cache prefetcher

   - af_packet: make packet_fanout.arr size configurable up to 64K

   - tcp: optimize TCP zero copy receive in presence of partial or
     unaligned reads making zero copy a performance win for much smaller
     messages

   - XDP: add bulk APIs for returning / freeing frames

   - sched: support fragmenting IP packets as they come out of conntrack

   - net: allow virtual netdevs to forward UDP L4 and fraglist GSO skbs

  BPF:

   - BPF switch from crude rlimit-based to memcg-based memory accounting

   - BPF type format information for kernel modules and related tracing
     enhancements

   - BPF implement task local storage for BPF LSM

   - allow the FENTRY/FEXIT/RAW_TP tracing programs to use
     bpf_sk_storage

  Protocols:

   - mptcp: improve multiple xmit streams support, memory accounting and
     many smaller improvements

   - TLS: support CHACHA20-POLY1305 cipher

   - seg6: add support for SRv6 End.DT4/DT6 behavior

   - sctp: Implement RFC 6951: UDP Encapsulation of SCTP

   - ppp_generic: add ability to bridge channels directly

   - bridge: Connectivity Fault Management (CFM) support as is defined
     in IEEE 802.1Q section 12.14.

  Drivers:

   - mlx5: make use of the new auxiliary bus to organize the driver
     internals

   - mlx5: more accurate port TX timestamping support

   - mlxsw:
      - improve the efficiency of offloaded next hop updates by using
        the new nexthop object API
      - support blackhole nexthops
      - support IEEE 802.1ad (Q-in-Q) bridging

   - rtw88: major bluetooth co-existance improvements

   - iwlwifi: support new 6 GHz frequency band

   - ath11k: Fast Initial Link Setup (FILS)

   - mt7915: dual band concurrent (DBDC) support

   - net: ipa: add basic support for IPA v4.5

  Refactor:

   - a few pieces of in_interrupt() cleanup work from Sebastian Andrzej
     Siewior

   - phy: add support for shared interrupts; get rid of multiple driver
     APIs and have the drivers write a full IRQ handler, slight growth
     of driver code should be compensated by the simpler API which also
     allows shared IRQs

   - add common code for handling netdev per-cpu counters

   - move TX packet re-allocation from Ethernet switch tag drivers to a
     central place

   - improve efficiency and rename nla_strlcpy

   - number of W=1 warning cleanups as we now catch those in a patchwork
     build bot

  Old code removal:

   - wan: delete the DLCI / SDLA drivers

   - wimax: move to staging

   - wifi: remove old WDS wifi bridging support"

* tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1922 commits)
  net: hns3: fix expression that is currently always true
  net: fix proc_fs init handling in af_packet and tls
  nfc: pn533: convert comma to semicolon
  af_vsock: Assign the vsock transport considering the vsock address flags
  af_vsock: Set VMADDR_FLAG_TO_HOST flag on the receive path
  vsock_addr: Check for supported flag values
  vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag
  vm_sockets: Add flags field in the vsock address data structure
  net: Disable NETIF_F_HW_TLS_TX when HW_CSUM is disabled
  tcp: Add logic to check for SYN w/ data in tcp_simple_retransmit
  net: mscc: ocelot: install MAC addresses in .ndo_set_rx_mode from process context
  nfc: s3fwrn5: Release the nfc firmware
  net: vxget: clean up sparse warnings
  mlxsw: spectrum_router: Use eXtended mezzanine to offload IPv4 router
  mlxsw: spectrum: Set KVH XLT cache mode for Spectrum2/3
  mlxsw: spectrum_router_xm: Introduce basic XM cache flushing
  mlxsw: reg: Add Router LPM Cache Enable Register
  mlxsw: reg: Add Router LPM Cache ML Delete Register
  mlxsw: spectrum_router_xm: Implement L-value tracking for M-index
  mlxsw: reg: Add XM Router M Table Register
  ...

1 files changed, 81 insertions, 1 deletions

diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c
index 3c03f6512c5f..213ea7abc9ab 100644
--- a/net/lapb/lapb_iface.c
+++ b/net/lapb/lapb_iface.c
@@ -418,14 +418,94 @@ int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb)
 	return used;
 }
 
+/* Handle device status changes. */
+static int lapb_device_event(struct notifier_block *this, unsigned long event,
+			     void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct lapb_cb *lapb;
+
+	if (!net_eq(dev_net(dev), &init_net))
+		return NOTIFY_DONE;
+
+	if (dev->type != ARPHRD_X25)
+		return NOTIFY_DONE;
+
+	lapb = lapb_devtostruct(dev);
+	if (!lapb)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		lapb_dbg(0, "(%p) Interface up: %s\n", dev, dev->name);
+
+		if (netif_carrier_ok(dev)) {
+			lapb_dbg(0, "(%p): Carrier is already up: %s\n", dev,
+				 dev->name);
+			if (lapb->mode & LAPB_DCE) {
+				lapb_start_t1timer(lapb);
+			} else {
+				if (lapb->state == LAPB_STATE_0) {
+					lapb->state = LAPB_STATE_1;
+					lapb_establish_data_link(lapb);
+				}
+			}
+		}
+		break;
+	case NETDEV_GOING_DOWN:
+		if (netif_carrier_ok(dev))
+			lapb_disconnect_request(dev);
+		break;
+	case NETDEV_DOWN:
+		lapb_dbg(0, "(%p) Interface down: %s\n", dev, dev->name);
+		lapb_dbg(0, "(%p) S%d -> S0\n", dev, lapb->state);
+		lapb_clear_queues(lapb);
+		lapb->state = LAPB_STATE_0;
+		lapb->n2count   = 0;
+		lapb_stop_t1timer(lapb);
+		lapb_stop_t2timer(lapb);
+		break;
+	case NETDEV_CHANGE:
+		if (netif_carrier_ok(dev)) {
+			lapb_dbg(0, "(%p): Carrier detected: %s\n", dev,
+				 dev->name);
+			if (lapb->mode & LAPB_DCE) {
+				lapb_start_t1timer(lapb);
+			} else {
+				if (lapb->state == LAPB_STATE_0) {
+					lapb->state = LAPB_STATE_1;
+					lapb_establish_data_link(lapb);
+				}
+			}
+		} else {
+			lapb_dbg(0, "(%p) Carrier lost: %s\n", dev, dev->name);
+			lapb_dbg(0, "(%p) S%d -> S0\n", dev, lapb->state);
+			lapb_clear_queues(lapb);
+			lapb->state = LAPB_STATE_0;
+			lapb->n2count   = 0;
+			lapb_stop_t1timer(lapb);
+			lapb_stop_t2timer(lapb);
+		}
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block lapb_dev_notifier = {
+	.notifier_call = lapb_device_event,
+};
+
 static int __init lapb_init(void)
 {
-	return 0;
+	return register_netdevice_notifier(&lapb_dev_notifier);
 }
 
 static void __exit lapb_exit(void)
 {
 	WARN_ON(!list_empty(&lapb_list));
+
+	unregister_netdevice_notifier(&lapb_dev_notifier);
 }
 
 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");