From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/net/wan/hdlc.c | 379 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 379 insertions(+) create mode 100644 drivers/net/wan/hdlc.c (limited to 'drivers/net/wan/hdlc.c') diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c new file mode 100644 index 000000000..cbed10b1d --- /dev/null +++ b/drivers/net/wan/hdlc.c @@ -0,0 +1,379 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic HDLC support routines for Linux + * + * Copyright (C) 1999 - 2008 Krzysztof Halasa + * + * Currently supported: + * * raw IP-in-HDLC + * * Cisco HDLC + * * Frame Relay with ANSI or CCITT LMI (both user and network side) + * * PPP + * * X.25 + * + * Use sethdlc utility to set line parameters, protocol and PVCs + * + * How does it work: + * - proto->open(), close(), start(), stop() calls are serialized. + * The order is: open, [ start, stop ... ] close ... + * - proto->start() and stop() are called with spin_lock_irq held. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const char *version = "HDLC support module revision 1.22"; + +#undef DEBUG_LINK + +static struct hdlc_proto *first_proto; + +static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *p, struct net_device *orig_dev) +{ + struct hdlc_device *hdlc; + + /* First make sure "dev" is an HDLC device */ + if (!(dev->priv_flags & IFF_WAN_HDLC)) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + hdlc = dev_to_hdlc(dev); + + if (!net_eq(dev_net(dev), &init_net)) { + kfree_skb(skb); + return 0; + } + + BUG_ON(!hdlc->proto->netif_rx); + return hdlc->proto->netif_rx(skb); +} + +netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + + if (hdlc->proto->xmit) + return hdlc->proto->xmit(skb, dev); + + return hdlc->xmit(skb, dev); /* call hardware driver directly */ +} +EXPORT_SYMBOL(hdlc_start_xmit); + +static inline void hdlc_proto_start(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + + if (hdlc->proto->start) + hdlc->proto->start(dev); +} + +static inline void hdlc_proto_stop(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + + if (hdlc->proto->stop) + hdlc->proto->stop(dev); +} + +static int hdlc_device_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + hdlc_device *hdlc; + unsigned long flags; + int on; + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + if (!(dev->priv_flags & IFF_WAN_HDLC)) + return NOTIFY_DONE; /* not an HDLC device */ + + if (event != NETDEV_CHANGE) + return NOTIFY_DONE; /* Only interested in carrier changes */ + + on = netif_carrier_ok(dev); + +#ifdef DEBUG_LINK + printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n", + dev->name, on); +#endif + + hdlc = dev_to_hdlc(dev); + spin_lock_irqsave(&hdlc->state_lock, flags); + + if (hdlc->carrier == on) + goto carrier_exit; /* no change in DCD line level */ + + hdlc->carrier = on; + + if (!hdlc->open) + goto carrier_exit; + + if (hdlc->carrier) { + netdev_info(dev, "Carrier detected\n"); + hdlc_proto_start(dev); + } else { + netdev_info(dev, "Carrier lost\n"); + hdlc_proto_stop(dev); + } + +carrier_exit: + spin_unlock_irqrestore(&hdlc->state_lock, flags); + return NOTIFY_DONE; +} + +/* Must be called by hardware driver when HDLC device is being opened */ +int hdlc_open(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); +#ifdef DEBUG_LINK + printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name, + hdlc->carrier, hdlc->open); +#endif + + if (!hdlc->proto) + return -ENOSYS; /* no protocol attached */ + + if (hdlc->proto->open) { + int result = hdlc->proto->open(dev); + + if (result) + return result; + } + + spin_lock_irq(&hdlc->state_lock); + + if (hdlc->carrier) { + netdev_info(dev, "Carrier detected\n"); + hdlc_proto_start(dev); + } else { + netdev_info(dev, "No carrier\n"); + } + + hdlc->open = 1; + + spin_unlock_irq(&hdlc->state_lock); + return 0; +} +EXPORT_SYMBOL(hdlc_open); + +/* Must be called by hardware driver when HDLC device is being closed */ +void hdlc_close(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); +#ifdef DEBUG_LINK + printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name, + hdlc->carrier, hdlc->open); +#endif + + spin_lock_irq(&hdlc->state_lock); + + hdlc->open = 0; + if (hdlc->carrier) + hdlc_proto_stop(dev); + + spin_unlock_irq(&hdlc->state_lock); + + if (hdlc->proto->close) + hdlc->proto->close(dev); +} +EXPORT_SYMBOL(hdlc_close); + +int hdlc_ioctl(struct net_device *dev, struct if_settings *ifs) +{ + struct hdlc_proto *proto = first_proto; + int result; + + if (dev_to_hdlc(dev)->proto) { + result = dev_to_hdlc(dev)->proto->ioctl(dev, ifs); + if (result != -EINVAL) + return result; + } + + /* Not handled by currently attached protocol (if any) */ + + while (proto) { + result = proto->ioctl(dev, ifs); + if (result != -EINVAL) + return result; + proto = proto->next; + } + return -EINVAL; +} +EXPORT_SYMBOL(hdlc_ioctl); + +static const struct header_ops hdlc_null_ops; + +static void hdlc_setup_dev(struct net_device *dev) +{ + /* Re-init all variables changed by HDLC protocol drivers, + * including ether_setup() called from hdlc_raw_eth.c. + */ + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->priv_flags = IFF_WAN_HDLC; + dev->mtu = HDLC_MAX_MTU; + dev->min_mtu = 68; + dev->max_mtu = HDLC_MAX_MTU; + dev->type = ARPHRD_RAWHDLC; + dev->hard_header_len = 0; + dev->needed_headroom = 0; + dev->addr_len = 0; + dev->header_ops = &hdlc_null_ops; +} + +static void hdlc_setup(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + + hdlc_setup_dev(dev); + hdlc->carrier = 1; + hdlc->open = 0; + spin_lock_init(&hdlc->state_lock); +} + +struct net_device *alloc_hdlcdev(void *priv) +{ + struct net_device *dev; + + dev = alloc_netdev(sizeof(struct hdlc_device), "hdlc%d", + NET_NAME_UNKNOWN, hdlc_setup); + if (dev) + dev_to_hdlc(dev)->priv = priv; + return dev; +} +EXPORT_SYMBOL(alloc_hdlcdev); + +void unregister_hdlc_device(struct net_device *dev) +{ + rtnl_lock(); + detach_hdlc_protocol(dev); + unregister_netdevice(dev); + rtnl_unlock(); +} +EXPORT_SYMBOL(unregister_hdlc_device); + +int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, + size_t size) +{ + int err; + + err = detach_hdlc_protocol(dev); + if (err) + return err; + + if (!try_module_get(proto->module)) + return -ENOSYS; + + if (size) { + dev_to_hdlc(dev)->state = kmalloc(size, GFP_KERNEL); + if (!dev_to_hdlc(dev)->state) { + module_put(proto->module); + return -ENOBUFS; + } + } + dev_to_hdlc(dev)->proto = proto; + + return 0; +} +EXPORT_SYMBOL(attach_hdlc_protocol); + +int detach_hdlc_protocol(struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + int err; + + if (hdlc->proto) { + err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev); + err = notifier_to_errno(err); + if (err) { + netdev_err(dev, "Refused to change device type\n"); + return err; + } + + if (hdlc->proto->detach) + hdlc->proto->detach(dev); + module_put(hdlc->proto->module); + hdlc->proto = NULL; + } + kfree(hdlc->state); + hdlc->state = NULL; + hdlc_setup_dev(dev); + + return 0; +} +EXPORT_SYMBOL(detach_hdlc_protocol); + +void register_hdlc_protocol(struct hdlc_proto *proto) +{ + rtnl_lock(); + proto->next = first_proto; + first_proto = proto; + rtnl_unlock(); +} +EXPORT_SYMBOL(register_hdlc_protocol); + +void unregister_hdlc_protocol(struct hdlc_proto *proto) +{ + struct hdlc_proto **p; + + rtnl_lock(); + p = &first_proto; + while (*p != proto) { + BUG_ON(!*p); + p = &((*p)->next); + } + *p = proto->next; + rtnl_unlock(); +} +EXPORT_SYMBOL(unregister_hdlc_protocol); + +MODULE_AUTHOR("Krzysztof Halasa "); +MODULE_DESCRIPTION("HDLC support module"); +MODULE_LICENSE("GPL v2"); + +static struct packet_type hdlc_packet_type __read_mostly = { + .type = cpu_to_be16(ETH_P_HDLC), + .func = hdlc_rcv, +}; + +static struct notifier_block hdlc_notifier = { + .notifier_call = hdlc_device_event, +}; + +static int __init hdlc_module_init(void) +{ + int result; + + pr_info("%s\n", version); + result = register_netdevice_notifier(&hdlc_notifier); + if (result) + return result; + dev_add_pack(&hdlc_packet_type); + return 0; +} + +static void __exit hdlc_module_exit(void) +{ + dev_remove_pack(&hdlc_packet_type); + unregister_netdevice_notifier(&hdlc_notifier); +} + +module_init(hdlc_module_init); +module_exit(hdlc_module_exit); -- cgit v1.2.3