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(). ... --- arch/mips/kernel/rtlx.c | 409 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 409 insertions(+) create mode 100644 arch/mips/kernel/rtlx.c (limited to 'arch/mips/kernel/rtlx.c') diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c new file mode 100644 index 000000000..18c509c59 --- /dev/null +++ b/arch/mips/kernel/rtlx.c @@ -0,0 +1,409 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. + * Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org) + * Copyright (C) 2013 Imagination Technologies Ltd. + */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +static int sp_stopping; +struct rtlx_info *rtlx; +struct chan_waitqueues channel_wqs[RTLX_CHANNELS]; +struct vpe_notifications rtlx_notify; +void (*aprp_hook)(void) = NULL; +EXPORT_SYMBOL(aprp_hook); + +static void __used dump_rtlx(void) +{ + int i; + + pr_info("id 0x%lx state %d\n", rtlx->id, rtlx->state); + + for (i = 0; i < RTLX_CHANNELS; i++) { + struct rtlx_channel *chan = &rtlx->channel[i]; + + pr_info(" rt_state %d lx_state %d buffer_size %d\n", + chan->rt_state, chan->lx_state, chan->buffer_size); + + pr_info(" rt_read %d rt_write %d\n", + chan->rt_read, chan->rt_write); + + pr_info(" lx_read %d lx_write %d\n", + chan->lx_read, chan->lx_write); + + pr_info(" rt_buffer <%s>\n", chan->rt_buffer); + pr_info(" lx_buffer <%s>\n", chan->lx_buffer); + } +} + +/* call when we have the address of the shared structure from the SP side. */ +static int rtlx_init(struct rtlx_info *rtlxi) +{ + if (rtlxi->id != RTLX_ID) { + pr_err("no valid RTLX id at 0x%p 0x%lx\n", rtlxi, rtlxi->id); + return -ENOEXEC; + } + + rtlx = rtlxi; + + return 0; +} + +/* notifications */ +void rtlx_starting(int vpe) +{ + int i; + sp_stopping = 0; + + /* force a reload of rtlx */ + rtlx = NULL; + + /* wake up any sleeping rtlx_open's */ + for (i = 0; i < RTLX_CHANNELS; i++) + wake_up_interruptible(&channel_wqs[i].lx_queue); +} + +void rtlx_stopping(int vpe) +{ + int i; + + sp_stopping = 1; + for (i = 0; i < RTLX_CHANNELS; i++) + wake_up_interruptible(&channel_wqs[i].lx_queue); +} + + +int rtlx_open(int index, int can_sleep) +{ + struct rtlx_info **p; + struct rtlx_channel *chan; + enum rtlx_state state; + int ret = 0; + + if (index >= RTLX_CHANNELS) { + pr_debug("rtlx_open index out of range\n"); + return -ENOSYS; + } + + if (atomic_inc_return(&channel_wqs[index].in_open) > 1) { + pr_debug("rtlx_open channel %d already opened\n", index); + ret = -EBUSY; + goto out_fail; + } + + if (rtlx == NULL) { + p = vpe_get_shared(aprp_cpu_index()); + if (p == NULL) { + if (can_sleep) { + ret = __wait_event_interruptible( + channel_wqs[index].lx_queue, + (p = vpe_get_shared(aprp_cpu_index()))); + if (ret) + goto out_fail; + } else { + pr_debug("No SP program loaded, and device opened with O_NONBLOCK\n"); + ret = -ENOSYS; + goto out_fail; + } + } + + smp_rmb(); + if (*p == NULL) { + if (can_sleep) { + DEFINE_WAIT(wait); + + for (;;) { + prepare_to_wait( + &channel_wqs[index].lx_queue, + &wait, TASK_INTERRUPTIBLE); + smp_rmb(); + if (*p != NULL) + break; + if (!signal_pending(current)) { + schedule(); + continue; + } + ret = -ERESTARTSYS; + goto out_fail; + } + finish_wait(&channel_wqs[index].lx_queue, + &wait); + } else { + pr_err(" *vpe_get_shared is NULL. Has an SP program been loaded?\n"); + ret = -ENOSYS; + goto out_fail; + } + } + + if ((unsigned int)*p < KSEG0) { + pr_warn("vpe_get_shared returned an invalid pointer maybe an error code %d\n", + (int)*p); + ret = -ENOSYS; + goto out_fail; + } + + ret = rtlx_init(*p); + if (ret < 0) + goto out_ret; + } + + chan = &rtlx->channel[index]; + + state = xchg(&chan->lx_state, RTLX_STATE_OPENED); + if (state == RTLX_STATE_OPENED) { + ret = -EBUSY; + goto out_fail; + } + +out_fail: + smp_mb(); + atomic_dec(&channel_wqs[index].in_open); + smp_mb(); + +out_ret: + return ret; +} + +int rtlx_release(int index) +{ + if (rtlx == NULL) { + pr_err("rtlx_release() with null rtlx\n"); + return 0; + } + rtlx->channel[index].lx_state = RTLX_STATE_UNUSED; + return 0; +} + +unsigned int rtlx_read_poll(int index, int can_sleep) +{ + struct rtlx_channel *chan; + + if (rtlx == NULL) + return 0; + + chan = &rtlx->channel[index]; + + /* data available to read? */ + if (chan->lx_read == chan->lx_write) { + if (can_sleep) { + int ret = __wait_event_interruptible( + channel_wqs[index].lx_queue, + (chan->lx_read != chan->lx_write) || + sp_stopping); + if (ret) + return ret; + + if (sp_stopping) + return 0; + } else + return 0; + } + + return (chan->lx_write + chan->buffer_size - chan->lx_read) + % chan->buffer_size; +} + +static inline int write_spacefree(int read, int write, int size) +{ + if (read == write) { + /* + * Never fill the buffer completely, so indexes are always + * equal if empty and only empty, or !equal if data available + */ + return size - 1; + } + + return ((read + size - write) % size) - 1; +} + +unsigned int rtlx_write_poll(int index) +{ + struct rtlx_channel *chan = &rtlx->channel[index]; + + return write_spacefree(chan->rt_read, chan->rt_write, + chan->buffer_size); +} + +ssize_t rtlx_read(int index, void __user *buff, size_t count) +{ + size_t lx_write, fl = 0L; + struct rtlx_channel *lx; + unsigned long failed; + + if (rtlx == NULL) + return -ENOSYS; + + lx = &rtlx->channel[index]; + + mutex_lock(&channel_wqs[index].mutex); + smp_rmb(); + lx_write = lx->lx_write; + + /* find out how much in total */ + count = min(count, + (size_t)(lx_write + lx->buffer_size - lx->lx_read) + % lx->buffer_size); + + /* then how much from the read pointer onwards */ + fl = min(count, (size_t)lx->buffer_size - lx->lx_read); + + failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl); + if (failed) + goto out; + + /* and if there is anything left at the beginning of the buffer */ + if (count - fl) + failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl); + +out: + count -= failed; + + smp_wmb(); + lx->lx_read = (lx->lx_read + count) % lx->buffer_size; + smp_wmb(); + mutex_unlock(&channel_wqs[index].mutex); + + return count; +} + +ssize_t rtlx_write(int index, const void __user *buffer, size_t count) +{ + struct rtlx_channel *rt; + unsigned long failed; + size_t rt_read; + size_t fl; + + if (rtlx == NULL) + return -ENOSYS; + + rt = &rtlx->channel[index]; + + mutex_lock(&channel_wqs[index].mutex); + smp_rmb(); + rt_read = rt->rt_read; + + /* total number of bytes to copy */ + count = min_t(size_t, count, write_spacefree(rt_read, rt->rt_write, + rt->buffer_size)); + + /* first bit from write pointer to the end of the buffer, or count */ + fl = min(count, (size_t) rt->buffer_size - rt->rt_write); + + failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl); + if (failed) + goto out; + + /* if there's any left copy to the beginning of the buffer */ + if (count - fl) + failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl); + +out: + count -= failed; + + smp_wmb(); + rt->rt_write = (rt->rt_write + count) % rt->buffer_size; + smp_wmb(); + mutex_unlock(&channel_wqs[index].mutex); + + _interrupt_sp(); + + return count; +} + + +static int file_open(struct inode *inode, struct file *filp) +{ + return rtlx_open(iminor(inode), (filp->f_flags & O_NONBLOCK) ? 0 : 1); +} + +static int file_release(struct inode *inode, struct file *filp) +{ + return rtlx_release(iminor(inode)); +} + +static __poll_t file_poll(struct file *file, poll_table *wait) +{ + int minor = iminor(file_inode(file)); + __poll_t mask = 0; + + poll_wait(file, &channel_wqs[minor].rt_queue, wait); + poll_wait(file, &channel_wqs[minor].lx_queue, wait); + + if (rtlx == NULL) + return 0; + + /* data available to read? */ + if (rtlx_read_poll(minor, 0)) + mask |= EPOLLIN | EPOLLRDNORM; + + /* space to write */ + if (rtlx_write_poll(minor)) + mask |= EPOLLOUT | EPOLLWRNORM; + + return mask; +} + +static ssize_t file_read(struct file *file, char __user *buffer, size_t count, + loff_t *ppos) +{ + int minor = iminor(file_inode(file)); + + /* data available? */ + if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) + return 0; /* -EAGAIN makes 'cat' whine */ + + return rtlx_read(minor, buffer, count); +} + +static ssize_t file_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos) +{ + int minor = iminor(file_inode(file)); + + /* any space left... */ + if (!rtlx_write_poll(minor)) { + int ret; + + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + + ret = __wait_event_interruptible(channel_wqs[minor].rt_queue, + rtlx_write_poll(minor)); + if (ret) + return ret; + } + + return rtlx_write(minor, buffer, count); +} + +const struct file_operations rtlx_fops = { + .owner = THIS_MODULE, + .open = file_open, + .release = file_release, + .write = file_write, + .read = file_read, + .poll = file_poll, + .llseek = noop_llseek, +}; + +module_init(rtlx_module_init); +module_exit(rtlx_module_exit); + +MODULE_DESCRIPTION("MIPS RTLX"); +MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); +MODULE_LICENSE("GPL"); -- cgit v1.2.3