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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /arch/mips/kernel/rtlx.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
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Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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(). ...
Diffstat (limited to 'arch/mips/kernel/rtlx.c')
-rw-r--r--arch/mips/kernel/rtlx.c409
1 files changed, 409 insertions, 0 deletions
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 <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/syscalls.h>
+#include <linux/moduleloader.h>
+#include <linux/atomic.h>
+#include <linux/sched/signal.h>
+
+#include <asm/mipsmtregs.h>
+#include <asm/mips_mt.h>
+#include <asm/processor.h>
+#include <asm/rtlx.h>
+#include <asm/setup.h>
+#include <asm/vpe.h>
+
+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");