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().
  ...

1 files changed, 344 insertions, 0 deletions

diff --git a/drivers/iio/potentiometer/ad5110.c b/drivers/iio/potentiometer/ad5110.c
new file mode 100644
index 000000000..8fbcce482
--- /dev/null
+++ b/drivers/iio/potentiometer/ad5110.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Analog Devices AD5110 digital potentiometer driver
+ *
+ * Copyright (C) 2021 Mugilraj Dhavachelvan <dmugil2000@gmail.com>
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.pdf
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* AD5110 commands */
+#define AD5110_EEPROM_WR	1
+#define AD5110_RDAC_WR		2
+#define AD5110_SHUTDOWN	3
+#define AD5110_RESET		4
+#define AD5110_RDAC_RD		5
+#define AD5110_EEPROM_RD	6
+
+/* AD5110_EEPROM_RD data */
+#define AD5110_WIPER_POS	0
+#define AD5110_RESISTOR_TOL	1
+
+#define AD5110_WIPER_RESISTANCE	70
+
+struct ad5110_cfg {
+	int max_pos;
+	int kohms;
+	int shift;
+};
+
+enum ad5110_type {
+	AD5110_10,
+	AD5110_80,
+	AD5112_05,
+	AD5112_10,
+	AD5112_80,
+	AD5114_10,
+	AD5114_80,
+};
+
+static const struct ad5110_cfg ad5110_cfg[] = {
+	[AD5110_10] = { .max_pos = 128, .kohms = 10 },
+	[AD5110_80] = { .max_pos = 128, .kohms = 80 },
+	[AD5112_05] = { .max_pos = 64, .kohms = 5, .shift = 1 },
+	[AD5112_10] = { .max_pos = 64, .kohms = 10, .shift = 1 },
+	[AD5112_80] = { .max_pos = 64, .kohms = 80, .shift = 1 },
+	[AD5114_10] = { .max_pos = 32, .kohms = 10, .shift = 2 },
+	[AD5114_80] = { .max_pos = 32, .kohms = 80, .shift = 2 },
+};
+
+struct ad5110_data {
+	struct i2c_client       *client;
+	s16			tol;		/* resistor tolerance */
+	bool			enable;
+	struct mutex            lock;
+	const struct ad5110_cfg	*cfg;
+	/*
+	 * DMA (thus cache coherency maintenance) may require the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	u8			buf[2] __aligned(IIO_DMA_MINALIGN);
+};
+
+static const struct iio_chan_spec ad5110_channels[] = {
+	{
+		.type = IIO_RESISTANCE,
+		.output = 1,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) |
+					BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_ENABLE),
+	},
+};
+
+static int ad5110_read(struct ad5110_data *data, u8 cmd, int *val)
+{
+	int ret;
+
+	mutex_lock(&data->lock);
+	data->buf[0] = cmd;
+	data->buf[1] = *val;
+
+	ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));
+	if (ret < 0) {
+		goto error;
+	} else if (ret != sizeof(data->buf)) {
+		ret = -EIO;
+		goto error;
+	}
+
+	ret = i2c_master_recv_dmasafe(data->client, data->buf, 1);
+	if (ret < 0) {
+		goto error;
+	} else if (ret != 1) {
+		ret = -EIO;
+		goto error;
+	}
+
+	*val = data->buf[0];
+	ret = 0;
+
+error:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int ad5110_write(struct ad5110_data *data, u8 cmd, u8 val)
+{
+	int ret;
+
+	mutex_lock(&data->lock);
+	data->buf[0] = cmd;
+	data->buf[1] = val;
+
+	ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));
+	if (ret < 0) {
+		goto error;
+	} else if (ret != sizeof(data->buf)) {
+		ret = -EIO;
+		goto error;
+	}
+
+	ret = 0;
+
+error:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int ad5110_resistor_tol(struct ad5110_data *data, u8 cmd, int val)
+{
+	int ret;
+
+	ret = ad5110_read(data, cmd, &val);
+	if (ret)
+		return ret;
+
+	data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8;
+	if (!(val & BIT(7)))
+		data->tol *= -1;
+
+	return 0;
+}
+
+static ssize_t store_eeprom_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad5110_data *data = iio_priv(indio_dev);
+	int val = AD5110_WIPER_POS;
+	int ret;
+
+	ret = ad5110_read(data, AD5110_EEPROM_RD, &val);
+	if (ret)
+		return ret;
+
+	val = val >> data->cfg->shift;
+	return iio_format_value(buf, IIO_VAL_INT, 1, &val);
+}
+
+static ssize_t store_eeprom_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad5110_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = ad5110_write(data, AD5110_EEPROM_WR, 0);
+	if (ret) {
+		dev_err(&data->client->dev, "RDAC to EEPROM write failed\n");
+		return ret;
+	}
+
+	/* The storing of EEPROM data takes approximately 18 ms. */
+	msleep(20);
+
+	return len;
+}
+
+static IIO_DEVICE_ATTR_RW(store_eeprom, 0);
+
+static struct attribute *ad5110_attributes[] = {
+	&iio_dev_attr_store_eeprom.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ad5110_attribute_group = {
+	.attrs = ad5110_attributes,
+};
+
+static int ad5110_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct ad5110_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = ad5110_read(data, AD5110_RDAC_RD, val);
+		if (ret)
+			return ret;
+
+		*val = *val >> data->cfg->shift;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_OFFSET:
+		*val = AD5110_WIPER_RESISTANCE * data->cfg->max_pos;
+		*val2 = 1000 * data->cfg->kohms + data->tol;
+		return IIO_VAL_FRACTIONAL;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 1000 * data->cfg->kohms + data->tol;
+		*val2 = data->cfg->max_pos;
+		return IIO_VAL_FRACTIONAL;
+	case IIO_CHAN_INFO_ENABLE:
+		*val = data->enable;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad5110_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	struct ad5110_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val > data->cfg->max_pos || val < 0)
+			return -EINVAL;
+
+		return ad5110_write(data, AD5110_RDAC_WR, val << data->cfg->shift);
+	case IIO_CHAN_INFO_ENABLE:
+		if (val < 0 || val > 1)
+			return -EINVAL;
+		if (data->enable == val)
+			return 0;
+		ret = ad5110_write(data, AD5110_SHUTDOWN, val ? 0 : 1);
+		if (ret)
+			return ret;
+		data->enable = val;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info ad5110_info = {
+	.read_raw = ad5110_read_raw,
+	.write_raw = ad5110_write_raw,
+	.attrs = &ad5110_attribute_group,
+};
+
+#define AD5110_COMPATIBLE(of_compatible, cfg) {	\
+			.compatible = of_compatible,	\
+			.data = &ad5110_cfg[cfg],	\
+}
+
+static const struct of_device_id ad5110_of_match[] = {
+	AD5110_COMPATIBLE("adi,ad5110-10", AD5110_10),
+	AD5110_COMPATIBLE("adi,ad5110-80", AD5110_80),
+	AD5110_COMPATIBLE("adi,ad5112-05", AD5112_05),
+	AD5110_COMPATIBLE("adi,ad5112-10", AD5112_10),
+	AD5110_COMPATIBLE("adi,ad5112-80", AD5112_80),
+	AD5110_COMPATIBLE("adi,ad5114-10", AD5114_10),
+	AD5110_COMPATIBLE("adi,ad5114-80", AD5114_80),
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad5110_of_match);
+
+static const struct i2c_device_id ad5110_id[] = {
+	{ "ad5110-10", AD5110_10 },
+	{ "ad5110-80", AD5110_80 },
+	{ "ad5112-05", AD5112_05 },
+	{ "ad5112-10", AD5112_10 },
+	{ "ad5112-80", AD5112_80 },
+	{ "ad5114-10", AD5114_10 },
+	{ "ad5114-80", AD5114_80 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ad5110_id);
+
+static int ad5110_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct iio_dev *indio_dev;
+	struct ad5110_data *data;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->client = client;
+	mutex_init(&data->lock);
+	data->enable = 1;
+	data->cfg = device_get_match_data(dev);
+
+	/* refresh RDAC register with EEPROM */
+	ret = ad5110_write(data, AD5110_RESET, 0);
+	if (ret) {
+		dev_err(dev, "Refresh RDAC with EEPROM failed\n");
+		return ret;
+	}
+
+	ret = ad5110_resistor_tol(data, AD5110_EEPROM_RD, AD5110_RESISTOR_TOL);
+	if (ret) {
+		dev_err(dev, "Read resistor tolerance failed\n");
+		return ret;
+	}
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &ad5110_info;
+	indio_dev->channels = ad5110_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad5110_channels);
+	indio_dev->name = client->name;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct i2c_driver ad5110_driver = {
+	.driver = {
+		.name	= "ad5110",
+		.of_match_table = ad5110_of_match,
+	},
+	.probe_new	= ad5110_probe,
+	.id_table	= ad5110_id,
+};
+module_i2c_driver(ad5110_driver);
+
+MODULE_AUTHOR("Mugilraj Dhavachelvan <dmugil2000@gmail.com>");
+MODULE_DESCRIPTION("AD5110 digital potentiometer");
+MODULE_LICENSE("GPL v2");