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/char/hw_random/timeriomem-rng.c | 210 ++++++++++++++++++++++++++++++++ 1 file changed, 210 insertions(+) create mode 100644 drivers/char/hw_random/timeriomem-rng.c (limited to 'drivers/char/hw_random/timeriomem-rng.c') diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c new file mode 100644 index 000000000..26f322d19 --- /dev/null +++ b/drivers/char/hw_random/timeriomem-rng.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * drivers/char/hw_random/timeriomem-rng.c + * + * Copyright (C) 2009 Alexander Clouter + * + * Derived from drivers/char/hw_random/omap-rng.c + * Copyright 2005 (c) MontaVista Software, Inc. + * Author: Deepak Saxena + * + * Overview: + * This driver is useful for platforms that have an IO range that provides + * periodic random data from a single IO memory address. All the platform + * has to do is provide the address and 'wait time' that new data becomes + * available. + * + * TODO: add support for reading sizes other than 32bits and masking + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct timeriomem_rng_private { + void __iomem *io_base; + ktime_t period; + unsigned int present:1; + + struct hrtimer timer; + struct completion completion; + + struct hwrng rng_ops; +}; + +static int timeriomem_rng_read(struct hwrng *hwrng, void *data, + size_t max, bool wait) +{ + struct timeriomem_rng_private *priv = + container_of(hwrng, struct timeriomem_rng_private, rng_ops); + int retval = 0; + int period_us = ktime_to_us(priv->period); + + /* + * There may not have been enough time for new data to be generated + * since the last request. If the caller doesn't want to wait, let them + * bail out. Otherwise, wait for the completion. If the new data has + * already been generated, the completion should already be available. + */ + if (!wait && !priv->present) + return 0; + + wait_for_completion(&priv->completion); + + do { + /* + * After the first read, all additional reads will need to wait + * for the RNG to generate new data. Since the period can have + * a wide range of values (1us to 1s have been observed), allow + * for 1% tolerance in the sleep time rather than a fixed value. + */ + if (retval > 0) + usleep_range(period_us, + period_us + max(1, period_us / 100)); + + *(u32 *)data = readl(priv->io_base); + retval += sizeof(u32); + data += sizeof(u32); + max -= sizeof(u32); + } while (wait && max > sizeof(u32)); + + /* + * Block any new callers until the RNG has had time to generate new + * data. + */ + priv->present = 0; + reinit_completion(&priv->completion); + hrtimer_forward_now(&priv->timer, priv->period); + hrtimer_restart(&priv->timer); + + return retval; +} + +static enum hrtimer_restart timeriomem_rng_trigger(struct hrtimer *timer) +{ + struct timeriomem_rng_private *priv + = container_of(timer, struct timeriomem_rng_private, timer); + + priv->present = 1; + complete(&priv->completion); + + return HRTIMER_NORESTART; +} + +static int timeriomem_rng_probe(struct platform_device *pdev) +{ + struct timeriomem_rng_data *pdata = pdev->dev.platform_data; + struct timeriomem_rng_private *priv; + struct resource *res; + int err = 0; + int period; + + if (!pdev->dev.of_node && !pdata) { + dev_err(&pdev->dev, "timeriomem_rng_data is missing\n"); + return -EINVAL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + + if (res->start % 4 != 0 || resource_size(res) < 4) { + dev_err(&pdev->dev, + "address must be at least four bytes wide and 32-bit aligned\n"); + return -EINVAL; + } + + /* Allocate memory for the device structure (and zero it) */ + priv = devm_kzalloc(&pdev->dev, + sizeof(struct timeriomem_rng_private), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + if (pdev->dev.of_node) { + int i; + + if (!of_property_read_u32(pdev->dev.of_node, + "period", &i)) + period = i; + else { + dev_err(&pdev->dev, "missing period\n"); + return -EINVAL; + } + + if (!of_property_read_u32(pdev->dev.of_node, + "quality", &i)) + priv->rng_ops.quality = i; + } else { + period = pdata->period; + priv->rng_ops.quality = pdata->quality; + } + + priv->period = ns_to_ktime(period * NSEC_PER_USEC); + init_completion(&priv->completion); + hrtimer_init(&priv->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + priv->timer.function = timeriomem_rng_trigger; + + priv->rng_ops.name = dev_name(&pdev->dev); + priv->rng_ops.read = timeriomem_rng_read; + + priv->io_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(priv->io_base)) { + return PTR_ERR(priv->io_base); + } + + /* Assume random data is already available. */ + priv->present = 1; + complete(&priv->completion); + + err = devm_hwrng_register(&pdev->dev, &priv->rng_ops); + if (err) { + dev_err(&pdev->dev, "problem registering\n"); + return err; + } + + dev_info(&pdev->dev, "32bits from 0x%p @ %dus\n", + priv->io_base, period); + + return 0; +} + +static int timeriomem_rng_remove(struct platform_device *pdev) +{ + struct timeriomem_rng_private *priv = platform_get_drvdata(pdev); + + hrtimer_cancel(&priv->timer); + + return 0; +} + +static const struct of_device_id timeriomem_rng_match[] = { + { .compatible = "timeriomem_rng" }, + {}, +}; +MODULE_DEVICE_TABLE(of, timeriomem_rng_match); + +static struct platform_driver timeriomem_rng_driver = { + .driver = { + .name = "timeriomem_rng", + .of_match_table = timeriomem_rng_match, + }, + .probe = timeriomem_rng_probe, + .remove = timeriomem_rng_remove, +}; + +module_platform_driver(timeriomem_rng_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alexander Clouter "); +MODULE_DESCRIPTION("Timer IOMEM H/W RNG driver"); -- cgit v1.2.3