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/platform/mellanox/mlxreg-io.c | 289 ++++++++++++++++++++++++++++++++++ 1 file changed, 289 insertions(+) create mode 100644 drivers/platform/mellanox/mlxreg-io.c (limited to 'drivers/platform/mellanox/mlxreg-io.c') diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c new file mode 100644 index 000000000..ddc08abf3 --- /dev/null +++ b/drivers/platform/mellanox/mlxreg-io.c @@ -0,0 +1,289 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Mellanox register access driver + * + * Copyright (C) 2018 Mellanox Technologies + * Copyright (C) 2018 Vadim Pasternak + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Attribute parameters. */ +#define MLXREG_IO_ATT_SIZE 10 +#define MLXREG_IO_ATT_NUM 96 + +/** + * struct mlxreg_io_priv_data - driver's private data: + * + * @pdev: platform device; + * @pdata: platform data; + * @hwmon: hwmon device; + * @mlxreg_io_attr: sysfs attributes array; + * @mlxreg_io_dev_attr: sysfs sensor device attribute array; + * @group: sysfs attribute group; + * @groups: list of sysfs attribute group for hwmon registration; + * @regsize: size of a register value; + * @io_lock: user access locking; + */ +struct mlxreg_io_priv_data { + struct platform_device *pdev; + struct mlxreg_core_platform_data *pdata; + struct device *hwmon; + struct attribute *mlxreg_io_attr[MLXREG_IO_ATT_NUM + 1]; + struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM]; + struct attribute_group group; + const struct attribute_group *groups[2]; + int regsize; + struct mutex io_lock; /* Protects user access. */ +}; + +static int +mlxreg_io_get_reg(void *regmap, struct mlxreg_core_data *data, u32 in_val, + bool rw_flag, int regsize, u32 *regval) +{ + int i, val, ret; + + ret = regmap_read(regmap, data->reg, regval); + if (ret) + goto access_error; + + /* + * There are four kinds of attributes: single bit, full register's + * bits, bit sequence, bits in few registers For the first kind field + * mask indicates which bits are not related and field bit is set zero. + * For the second kind field mask is set to zero and field bit is set + * with all bits one. No special handling for such kind of attributes - + * pass value as is. For the third kind, the field mask indicates which + * bits are related and the field bit is set to the first bit number + * (from 1 to 32) is the bit sequence. For the fourth kind - the number + * of registers which should be read for getting an attribute are + * specified through 'data->regnum' field. + */ + if (!data->bit) { + /* Single bit. */ + if (rw_flag) { + /* For show: expose effective bit value as 0 or 1. */ + *regval = !!(*regval & ~data->mask); + } else { + /* For store: set effective bit value. */ + *regval &= data->mask; + if (in_val) + *regval |= ~data->mask; + } + } else if (data->mask) { + /* Bit sequence. */ + if (rw_flag) { + /* For show: mask and shift right. */ + *regval = ror32(*regval & data->mask, (data->bit - 1)); + } else { + /* For store: shift to the position and mask. */ + in_val = rol32(in_val, data->bit - 1) & data->mask; + /* Clear relevant bits and set them to new value. */ + *regval = (*regval & ~data->mask) | in_val; + } + } else { + /* + * Some attributes could occupied few registers in case regmap + * bit size is 8 or 16. Compose such attributes from 'regnum' + * registers. Such attributes contain read-only data. + */ + for (i = 1; i < data->regnum; i++) { + ret = regmap_read(regmap, data->reg + i, &val); + if (ret) + goto access_error; + + *regval |= rol32(val, regsize * i * 8); + } + } + +access_error: + return ret; +} + +static ssize_t +mlxreg_io_attr_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + struct mlxreg_core_data *data = priv->pdata->data + index; + u32 regval = 0; + int ret; + + mutex_lock(&priv->io_lock); + + ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, + priv->regsize, ®val); + if (ret) + goto access_error; + + mutex_unlock(&priv->io_lock); + + return sprintf(buf, "%u\n", regval); + +access_error: + mutex_unlock(&priv->io_lock); + return ret; +} + +static ssize_t +mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev); + int index = to_sensor_dev_attr(attr)->index; + struct mlxreg_core_data *data = priv->pdata->data + index; + u32 input_val, regval; + int ret; + + if (len > MLXREG_IO_ATT_SIZE) + return -EINVAL; + + /* Convert buffer to input value. */ + ret = kstrtou32(buf, 0, &input_val); + if (ret) + return ret; + + mutex_lock(&priv->io_lock); + + ret = mlxreg_io_get_reg(priv->pdata->regmap, data, input_val, false, + priv->regsize, ®val); + if (ret) + goto access_error; + + ret = regmap_write(priv->pdata->regmap, data->reg, regval); + if (ret) + goto access_error; + + mutex_unlock(&priv->io_lock); + + return len; + +access_error: + mutex_unlock(&priv->io_lock); + dev_err(&priv->pdev->dev, "Bus access error\n"); + return ret; +} + +static struct device_attribute mlxreg_io_devattr_rw = { + .show = mlxreg_io_attr_show, + .store = mlxreg_io_attr_store, +}; + +static int mlxreg_io_attr_init(struct mlxreg_io_priv_data *priv) +{ + int i; + + priv->group.attrs = devm_kcalloc(&priv->pdev->dev, + priv->pdata->counter, + sizeof(struct attribute *), + GFP_KERNEL); + if (!priv->group.attrs) + return -ENOMEM; + + for (i = 0; i < priv->pdata->counter; i++) { + priv->mlxreg_io_attr[i] = + &priv->mlxreg_io_dev_attr[i].dev_attr.attr; + memcpy(&priv->mlxreg_io_dev_attr[i].dev_attr, + &mlxreg_io_devattr_rw, sizeof(struct device_attribute)); + + /* Set attribute name as a label. */ + priv->mlxreg_io_attr[i]->name = + devm_kasprintf(&priv->pdev->dev, GFP_KERNEL, + priv->pdata->data[i].label); + + if (!priv->mlxreg_io_attr[i]->name) { + dev_err(&priv->pdev->dev, "Memory allocation failed for sysfs attribute %d.\n", + i + 1); + return -ENOMEM; + } + + priv->mlxreg_io_dev_attr[i].dev_attr.attr.mode = + priv->pdata->data[i].mode; + priv->mlxreg_io_dev_attr[i].dev_attr.attr.name = + priv->mlxreg_io_attr[i]->name; + priv->mlxreg_io_dev_attr[i].index = i; + sysfs_attr_init(&priv->mlxreg_io_dev_attr[i].dev_attr.attr); + } + + priv->group.attrs = priv->mlxreg_io_attr; + priv->groups[0] = &priv->group; + priv->groups[1] = NULL; + + return 0; +} + +static int mlxreg_io_probe(struct platform_device *pdev) +{ + struct mlxreg_io_priv_data *priv; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->pdata = dev_get_platdata(&pdev->dev); + if (!priv->pdata) { + dev_err(&pdev->dev, "Failed to get platform data.\n"); + return -EINVAL; + } + + priv->pdev = pdev; + priv->regsize = regmap_get_val_bytes(priv->pdata->regmap); + if (priv->regsize < 0) + return priv->regsize; + + err = mlxreg_io_attr_init(priv); + if (err) { + dev_err(&priv->pdev->dev, "Failed to allocate attributes: %d\n", + err); + return err; + } + + priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, + "mlxreg_io", + priv, + priv->groups); + if (IS_ERR(priv->hwmon)) { + dev_err(&pdev->dev, "Failed to register hwmon device %ld\n", + PTR_ERR(priv->hwmon)); + return PTR_ERR(priv->hwmon); + } + + mutex_init(&priv->io_lock); + dev_set_drvdata(&pdev->dev, priv); + + return 0; +} + +static int mlxreg_io_remove(struct platform_device *pdev) +{ + struct mlxreg_io_priv_data *priv = dev_get_drvdata(&pdev->dev); + + mutex_destroy(&priv->io_lock); + + return 0; +} + +static struct platform_driver mlxreg_io_driver = { + .driver = { + .name = "mlxreg-io", + }, + .probe = mlxreg_io_probe, + .remove = mlxreg_io_remove, +}; + +module_platform_driver(mlxreg_io_driver); + +MODULE_AUTHOR("Vadim Pasternak "); +MODULE_DESCRIPTION("Mellanox regmap I/O access driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:mlxreg-io"); -- cgit v1.2.3