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/usb/core/file.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 drivers/usb/core/file.c (limited to 'drivers/usb/core/file.c') diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c new file mode 100644 index 000000000..da7d88e06 --- /dev/null +++ b/drivers/usb/core/file.c @@ -0,0 +1,247 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * drivers/usb/core/file.c + * + * (C) Copyright Linus Torvalds 1999 + * (C) Copyright Johannes Erdfelt 1999-2001 + * (C) Copyright Andreas Gal 1999 + * (C) Copyright Gregory P. Smith 1999 + * (C) Copyright Deti Fliegl 1999 (new USB architecture) + * (C) Copyright Randy Dunlap 2000 + * (C) Copyright David Brownell 2000-2001 (kernel hotplug, usb_device_id, + * more docs, etc) + * (C) Copyright Yggdrasil Computing, Inc. 2000 + * (usb_device_id matching changes by Adam J. Richter) + * (C) Copyright Greg Kroah-Hartman 2002-2003 + * + * Released under the GPLv2 only. + */ + +#include +#include +#include +#include +#include +#include + +#include "usb.h" + +#define MAX_USB_MINORS 256 +static const struct file_operations *usb_minors[MAX_USB_MINORS]; +static DECLARE_RWSEM(minor_rwsem); +static DEFINE_MUTEX(init_usb_class_mutex); + +static int usb_open(struct inode *inode, struct file *file) +{ + int err = -ENODEV; + const struct file_operations *new_fops; + + down_read(&minor_rwsem); + new_fops = fops_get(usb_minors[iminor(inode)]); + + if (!new_fops) + goto done; + + replace_fops(file, new_fops); + /* Curiouser and curiouser... NULL ->open() as "no device" ? */ + if (file->f_op->open) + err = file->f_op->open(inode, file); + done: + up_read(&minor_rwsem); + return err; +} + +static const struct file_operations usb_fops = { + .owner = THIS_MODULE, + .open = usb_open, + .llseek = noop_llseek, +}; + +static struct usb_class { + struct kref kref; + struct class *class; +} *usb_class; + +static char *usb_devnode(const struct device *dev, umode_t *mode) +{ + struct usb_class_driver *drv; + + drv = dev_get_drvdata(dev); + if (!drv || !drv->devnode) + return NULL; + return drv->devnode(dev, mode); +} + +static int init_usb_class(void) +{ + int result = 0; + + if (usb_class != NULL) { + kref_get(&usb_class->kref); + goto exit; + } + + usb_class = kmalloc(sizeof(*usb_class), GFP_KERNEL); + if (!usb_class) { + result = -ENOMEM; + goto exit; + } + + kref_init(&usb_class->kref); + usb_class->class = class_create(THIS_MODULE, "usbmisc"); + if (IS_ERR(usb_class->class)) { + result = PTR_ERR(usb_class->class); + printk(KERN_ERR "class_create failed for usb devices\n"); + kfree(usb_class); + usb_class = NULL; + goto exit; + } + usb_class->class->devnode = usb_devnode; + +exit: + return result; +} + +static void release_usb_class(struct kref *kref) +{ + /* Ok, we cheat as we know we only have one usb_class */ + class_destroy(usb_class->class); + kfree(usb_class); + usb_class = NULL; +} + +static void destroy_usb_class(void) +{ + mutex_lock(&init_usb_class_mutex); + kref_put(&usb_class->kref, release_usb_class); + mutex_unlock(&init_usb_class_mutex); +} + +int usb_major_init(void) +{ + int error; + + error = register_chrdev(USB_MAJOR, "usb", &usb_fops); + if (error) + printk(KERN_ERR "Unable to get major %d for usb devices\n", + USB_MAJOR); + + return error; +} + +void usb_major_cleanup(void) +{ + unregister_chrdev(USB_MAJOR, "usb"); +} + +/** + * usb_register_dev - register a USB device, and ask for a minor number + * @intf: pointer to the usb_interface that is being registered + * @class_driver: pointer to the usb_class_driver for this device + * + * This should be called by all USB drivers that use the USB major number. + * If CONFIG_USB_DYNAMIC_MINORS is enabled, the minor number will be + * dynamically allocated out of the list of available ones. If it is not + * enabled, the minor number will be based on the next available free minor, + * starting at the class_driver->minor_base. + * + * This function also creates a usb class device in the sysfs tree. + * + * usb_deregister_dev() must be called when the driver is done with + * the minor numbers given out by this function. + * + * Return: -EINVAL if something bad happens with trying to register a + * device, and 0 on success. + */ +int usb_register_dev(struct usb_interface *intf, + struct usb_class_driver *class_driver) +{ + int retval; + int minor_base = class_driver->minor_base; + int minor; + char name[20]; + +#ifdef CONFIG_USB_DYNAMIC_MINORS + /* + * We don't care what the device tries to start at, we want to start + * at zero to pack the devices into the smallest available space with + * no holes in the minor range. + */ + minor_base = 0; +#endif + + if (class_driver->fops == NULL) + return -EINVAL; + if (intf->minor >= 0) + return -EADDRINUSE; + + mutex_lock(&init_usb_class_mutex); + retval = init_usb_class(); + mutex_unlock(&init_usb_class_mutex); + + if (retval) + return retval; + + dev_dbg(&intf->dev, "looking for a minor, starting at %d\n", minor_base); + + down_write(&minor_rwsem); + for (minor = minor_base; minor < MAX_USB_MINORS; ++minor) { + if (usb_minors[minor]) + continue; + + usb_minors[minor] = class_driver->fops; + intf->minor = minor; + break; + } + if (intf->minor < 0) { + up_write(&minor_rwsem); + return -EXFULL; + } + + /* create a usb class device for this usb interface */ + snprintf(name, sizeof(name), class_driver->name, minor - minor_base); + intf->usb_dev = device_create(usb_class->class, &intf->dev, + MKDEV(USB_MAJOR, minor), class_driver, + "%s", kbasename(name)); + if (IS_ERR(intf->usb_dev)) { + usb_minors[minor] = NULL; + intf->minor = -1; + retval = PTR_ERR(intf->usb_dev); + } + up_write(&minor_rwsem); + return retval; +} +EXPORT_SYMBOL_GPL(usb_register_dev); + +/** + * usb_deregister_dev - deregister a USB device's dynamic minor. + * @intf: pointer to the usb_interface that is being deregistered + * @class_driver: pointer to the usb_class_driver for this device + * + * Used in conjunction with usb_register_dev(). This function is called + * when the USB driver is finished with the minor numbers gotten from a + * call to usb_register_dev() (usually when the device is disconnected + * from the system.) + * + * This function also removes the usb class device from the sysfs tree. + * + * This should be called by all drivers that use the USB major number. + */ +void usb_deregister_dev(struct usb_interface *intf, + struct usb_class_driver *class_driver) +{ + if (intf->minor == -1) + return; + + dev_dbg(&intf->dev, "removing %d minor\n", intf->minor); + device_destroy(usb_class->class, MKDEV(USB_MAJOR, intf->minor)); + + down_write(&minor_rwsem); + usb_minors[intf->minor] = NULL; + up_write(&minor_rwsem); + + intf->usb_dev = NULL; + intf->minor = -1; + destroy_usb_class(); +} +EXPORT_SYMBOL_GPL(usb_deregister_dev); -- cgit v1.2.3