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/tty/hvc/hvc_dcc.c | 301 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 drivers/tty/hvc/hvc_dcc.c (limited to 'drivers/tty/hvc/hvc_dcc.c') diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c new file mode 100644 index 000000000..1751108cf --- /dev/null +++ b/drivers/tty/hvc/hvc_dcc.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2010, 2014, 2022 The Linux Foundation. All rights reserved. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "hvc_console.h" + +/* DCC Status Bits */ +#define DCC_STATUS_RX (1 << 30) +#define DCC_STATUS_TX (1 << 29) + +#define DCC_INBUF_SIZE 128 +#define DCC_OUTBUF_SIZE 1024 + +/* Lock to serialize access to DCC fifo */ +static DEFINE_SPINLOCK(dcc_lock); + +static DEFINE_KFIFO(inbuf, unsigned char, DCC_INBUF_SIZE); +static DEFINE_KFIFO(outbuf, unsigned char, DCC_OUTBUF_SIZE); + +static void dcc_uart_console_putchar(struct uart_port *port, unsigned char ch) +{ + while (__dcc_getstatus() & DCC_STATUS_TX) + cpu_relax(); + + __dcc_putchar(ch); +} + +static void dcc_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, dcc_uart_console_putchar); +} + +static int __init dcc_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + device->con->write = dcc_early_write; + + return 0; +} + +EARLYCON_DECLARE(dcc, dcc_early_console_setup); + +static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count) +{ + int i; + + for (i = 0; i < count; i++) { + while (__dcc_getstatus() & DCC_STATUS_TX) + cpu_relax(); + + __dcc_putchar(buf[i]); + } + + return count; +} + +static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count) +{ + int i; + + for (i = 0; i < count; ++i) + if (__dcc_getstatus() & DCC_STATUS_RX) + buf[i] = __dcc_getchar(); + else + break; + + return i; +} + +/* + * Check if the DCC is enabled. If CONFIG_HVC_DCC_SERIALIZE_SMP is enabled, + * then we assume then this function will be called first on core0. That way, + * dcc_core0_available will be true only if it's available on core0. + */ +static bool hvc_dcc_check(void) +{ + unsigned long time = jiffies + (HZ / 10); + static bool dcc_core0_available; + + /* + * If we're not on core 0, but we previously confirmed that DCC is + * active, then just return true. + */ + int cpu = get_cpu(); + + if (IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP) && cpu && dcc_core0_available) { + put_cpu(); + return true; + } + + put_cpu(); + + /* Write a test character to check if it is handled */ + __dcc_putchar('\n'); + + while (time_is_after_jiffies(time)) { + if (!(__dcc_getstatus() & DCC_STATUS_TX)) { + dcc_core0_available = true; + return true; + } + } + + return false; +} + +/* + * Workqueue function that writes the output FIFO to the DCC on core 0. + */ +static void dcc_put_work(struct work_struct *work) +{ + unsigned char ch; + unsigned long irqflags; + + spin_lock_irqsave(&dcc_lock, irqflags); + + /* While there's data in the output FIFO, write it to the DCC */ + while (kfifo_get(&outbuf, &ch)) + hvc_dcc_put_chars(0, &ch, 1); + + /* While we're at it, check for any input characters */ + while (!kfifo_is_full(&inbuf)) { + if (!hvc_dcc_get_chars(0, &ch, 1)) + break; + kfifo_put(&inbuf, ch); + } + + spin_unlock_irqrestore(&dcc_lock, irqflags); +} + +static DECLARE_WORK(dcc_pwork, dcc_put_work); + +/* + * Workqueue function that reads characters from DCC and puts them into the + * input FIFO. + */ +static void dcc_get_work(struct work_struct *work) +{ + unsigned char ch; + unsigned long irqflags; + + /* + * Read characters from DCC and put them into the input FIFO, as + * long as there is room and we have characters to read. + */ + spin_lock_irqsave(&dcc_lock, irqflags); + + while (!kfifo_is_full(&inbuf)) { + if (!hvc_dcc_get_chars(0, &ch, 1)) + break; + kfifo_put(&inbuf, ch); + } + spin_unlock_irqrestore(&dcc_lock, irqflags); +} + +static DECLARE_WORK(dcc_gwork, dcc_get_work); + +/* + * Write characters directly to the DCC if we're on core 0 and the FIFO + * is empty, or write them to the FIFO if we're not. + */ +static int hvc_dcc0_put_chars(u32 vt, const char *buf, int count) +{ + int len; + unsigned long irqflags; + + if (!IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP)) + return hvc_dcc_put_chars(vt, buf, count); + + spin_lock_irqsave(&dcc_lock, irqflags); + if (smp_processor_id() || (!kfifo_is_empty(&outbuf))) { + len = kfifo_in(&outbuf, buf, count); + spin_unlock_irqrestore(&dcc_lock, irqflags); + + /* + * We just push data to the output FIFO, so schedule the + * workqueue that will actually write that data to DCC. + * CPU hotplug is disabled in dcc_init so CPU0 cannot be + * offlined after the cpu online check. + */ + if (cpu_online(0)) + schedule_work_on(0, &dcc_pwork); + + return len; + } + + /* + * If we're already on core 0, and the FIFO is empty, then just + * write the data to DCC. + */ + len = hvc_dcc_put_chars(vt, buf, count); + spin_unlock_irqrestore(&dcc_lock, irqflags); + + return len; +} + +/* + * Read characters directly from the DCC if we're on core 0 and the FIFO + * is empty, or read them from the FIFO if we're not. + */ +static int hvc_dcc0_get_chars(u32 vt, char *buf, int count) +{ + int len; + unsigned long irqflags; + + if (!IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP)) + return hvc_dcc_get_chars(vt, buf, count); + + spin_lock_irqsave(&dcc_lock, irqflags); + + if (smp_processor_id() || (!kfifo_is_empty(&inbuf))) { + len = kfifo_out(&inbuf, buf, count); + spin_unlock_irqrestore(&dcc_lock, irqflags); + + /* + * If the FIFO was empty, there may be characters in the DCC + * that we haven't read yet. Schedule a workqueue to fill + * the input FIFO, so that the next time this function is + * called, we'll have data. CPU hotplug is disabled in dcc_init + * so CPU0 cannot be offlined after the cpu online check. + */ + if (!len && cpu_online(0)) + schedule_work_on(0, &dcc_gwork); + + return len; + } + + /* + * If we're already on core 0, and the FIFO is empty, then just + * read the data from DCC. + */ + len = hvc_dcc_get_chars(vt, buf, count); + spin_unlock_irqrestore(&dcc_lock, irqflags); + + return len; +} + +static const struct hv_ops hvc_dcc_get_put_ops = { + .get_chars = hvc_dcc0_get_chars, + .put_chars = hvc_dcc0_put_chars, +}; + +static int __init hvc_dcc_console_init(void) +{ + int ret; + + if (!hvc_dcc_check()) + return -ENODEV; + + /* Returns -1 if error */ + ret = hvc_instantiate(0, 0, &hvc_dcc_get_put_ops); + + return ret < 0 ? -ENODEV : 0; +} +console_initcall(hvc_dcc_console_init); + +static int __init hvc_dcc_init(void) +{ + struct hvc_struct *p; + + if (!hvc_dcc_check()) + return -ENODEV; + + if (IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP)) { + pr_warn("\n"); + pr_warn("********************************************************************\n"); + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); + pr_warn("** **\n"); + pr_warn("** HVC_DCC_SERIALIZE_SMP SUPPORT HAS BEEN ENABLED IN THIS KERNEL **\n"); + pr_warn("** **\n"); + pr_warn("** This means that this is a DEBUG kernel and unsafe for **\n"); + pr_warn("** production use and has important feature like CPU hotplug **\n"); + pr_warn("** disabled. **\n"); + pr_warn("** **\n"); + pr_warn("** If you see this message and you are not debugging the **\n"); + pr_warn("** kernel, report this immediately to your vendor! **\n"); + pr_warn("** **\n"); + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); + pr_warn("********************************************************************\n"); + + cpu_hotplug_disable(); + } + + p = hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128); + + return PTR_ERR_OR_ZERO(p); +} +device_initcall(hvc_dcc_init); -- cgit v1.2.3