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(). ... --- samples/kobject/kset-example.c | 288 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 288 insertions(+) create mode 100644 samples/kobject/kset-example.c (limited to 'samples/kobject/kset-example.c') diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c new file mode 100644 index 000000000..52f1acabd --- /dev/null +++ b/samples/kobject/kset-example.c @@ -0,0 +1,288 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sample kset and ktype implementation + * + * Copyright (C) 2004-2007 Greg Kroah-Hartman + * Copyright (C) 2007 Novell Inc. + */ +#include +#include +#include +#include +#include +#include + +/* + * This module shows how to create a kset in sysfs called + * /sys/kernel/kset-example + * Then tree kobjects are created and assigned to this kset, "foo", "baz", + * and "bar". In those kobjects, attributes of the same name are also + * created and if an integer is written to these files, it can be later + * read out of it. + */ + + +/* + * This is our "object" that we will create a few of and register them with + * sysfs. + */ +struct foo_obj { + struct kobject kobj; + int foo; + int baz; + int bar; +}; +#define to_foo_obj(x) container_of(x, struct foo_obj, kobj) + +/* a custom attribute that works just for a struct foo_obj. */ +struct foo_attribute { + struct attribute attr; + ssize_t (*show)(struct foo_obj *foo, struct foo_attribute *attr, char *buf); + ssize_t (*store)(struct foo_obj *foo, struct foo_attribute *attr, const char *buf, size_t count); +}; +#define to_foo_attr(x) container_of(x, struct foo_attribute, attr) + +/* + * The default show function that must be passed to sysfs. This will be + * called by sysfs for whenever a show function is called by the user on a + * sysfs file associated with the kobjects we have registered. We need to + * transpose back from a "default" kobject to our custom struct foo_obj and + * then call the show function for that specific object. + */ +static ssize_t foo_attr_show(struct kobject *kobj, + struct attribute *attr, + char *buf) +{ + struct foo_attribute *attribute; + struct foo_obj *foo; + + attribute = to_foo_attr(attr); + foo = to_foo_obj(kobj); + + if (!attribute->show) + return -EIO; + + return attribute->show(foo, attribute, buf); +} + +/* + * Just like the default show function above, but this one is for when the + * sysfs "store" is requested (when a value is written to a file.) + */ +static ssize_t foo_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *buf, size_t len) +{ + struct foo_attribute *attribute; + struct foo_obj *foo; + + attribute = to_foo_attr(attr); + foo = to_foo_obj(kobj); + + if (!attribute->store) + return -EIO; + + return attribute->store(foo, attribute, buf, len); +} + +/* Our custom sysfs_ops that we will associate with our ktype later on */ +static const struct sysfs_ops foo_sysfs_ops = { + .show = foo_attr_show, + .store = foo_attr_store, +}; + +/* + * The release function for our object. This is REQUIRED by the kernel to + * have. We free the memory held in our object here. + * + * NEVER try to get away with just a "blank" release function to try to be + * smarter than the kernel. Turns out, no one ever is... + */ +static void foo_release(struct kobject *kobj) +{ + struct foo_obj *foo; + + foo = to_foo_obj(kobj); + kfree(foo); +} + +/* + * The "foo" file where the .foo variable is read from and written to. + */ +static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%d\n", foo_obj->foo); +} + +static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr, + const char *buf, size_t count) +{ + int ret; + + ret = kstrtoint(buf, 10, &foo_obj->foo); + if (ret < 0) + return ret; + + return count; +} + +/* Sysfs attributes cannot be world-writable. */ +static struct foo_attribute foo_attribute = + __ATTR(foo, 0664, foo_show, foo_store); + +/* + * More complex function where we determine which variable is being accessed by + * looking at the attribute for the "baz" and "bar" files. + */ +static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr, + char *buf) +{ + int var; + + if (strcmp(attr->attr.name, "baz") == 0) + var = foo_obj->baz; + else + var = foo_obj->bar; + return sysfs_emit(buf, "%d\n", var); +} + +static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr, + const char *buf, size_t count) +{ + int var, ret; + + ret = kstrtoint(buf, 10, &var); + if (ret < 0) + return ret; + + if (strcmp(attr->attr.name, "baz") == 0) + foo_obj->baz = var; + else + foo_obj->bar = var; + return count; +} + +static struct foo_attribute baz_attribute = + __ATTR(baz, 0664, b_show, b_store); +static struct foo_attribute bar_attribute = + __ATTR(bar, 0664, b_show, b_store); + +/* + * Create a group of attributes so that we can create and destroy them all + * at once. + */ +static struct attribute *foo_default_attrs[] = { + &foo_attribute.attr, + &baz_attribute.attr, + &bar_attribute.attr, + NULL, /* need to NULL terminate the list of attributes */ +}; +ATTRIBUTE_GROUPS(foo_default); + +/* + * Our own ktype for our kobjects. Here we specify our sysfs ops, the + * release function, and the set of default attributes we want created + * whenever a kobject of this type is registered with the kernel. + */ +static struct kobj_type foo_ktype = { + .sysfs_ops = &foo_sysfs_ops, + .release = foo_release, + .default_groups = foo_default_groups, +}; + +static struct kset *example_kset; +static struct foo_obj *foo_obj; +static struct foo_obj *bar_obj; +static struct foo_obj *baz_obj; + +static struct foo_obj *create_foo_obj(const char *name) +{ + struct foo_obj *foo; + int retval; + + /* allocate the memory for the whole object */ + foo = kzalloc(sizeof(*foo), GFP_KERNEL); + if (!foo) + return NULL; + + /* + * As we have a kset for this kobject, we need to set it before calling + * the kobject core. + */ + foo->kobj.kset = example_kset; + + /* + * Initialize and add the kobject to the kernel. All the default files + * will be created here. As we have already specified a kset for this + * kobject, we don't have to set a parent for the kobject, the kobject + * will be placed beneath that kset automatically. + */ + retval = kobject_init_and_add(&foo->kobj, &foo_ktype, NULL, "%s", name); + if (retval) { + kobject_put(&foo->kobj); + return NULL; + } + + /* + * We are always responsible for sending the uevent that the kobject + * was added to the system. + */ + kobject_uevent(&foo->kobj, KOBJ_ADD); + + return foo; +} + +static void destroy_foo_obj(struct foo_obj *foo) +{ + kobject_put(&foo->kobj); +} + +static int __init example_init(void) +{ + /* + * Create a kset with the name of "kset_example", + * located under /sys/kernel/ + */ + example_kset = kset_create_and_add("kset_example", NULL, kernel_kobj); + if (!example_kset) + return -ENOMEM; + + /* + * Create three objects and register them with our kset + */ + foo_obj = create_foo_obj("foo"); + if (!foo_obj) + goto foo_error; + + bar_obj = create_foo_obj("bar"); + if (!bar_obj) + goto bar_error; + + baz_obj = create_foo_obj("baz"); + if (!baz_obj) + goto baz_error; + + return 0; + +baz_error: + destroy_foo_obj(bar_obj); +bar_error: + destroy_foo_obj(foo_obj); +foo_error: + kset_unregister(example_kset); + return -EINVAL; +} + +static void __exit example_exit(void) +{ + destroy_foo_obj(baz_obj); + destroy_foo_obj(bar_obj); + destroy_foo_obj(foo_obj); + kset_unregister(example_kset); +} + +module_init(example_init); +module_exit(example_exit); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Greg Kroah-Hartman "); -- cgit v1.2.3