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/misc/cxl/vphb.c | 309 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 309 insertions(+) create mode 100644 drivers/misc/cxl/vphb.c (limited to 'drivers/misc/cxl/vphb.c') diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c new file mode 100644 index 000000000..6332db804 --- /dev/null +++ b/drivers/misc/cxl/vphb.c @@ -0,0 +1,309 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2014 IBM Corp. + */ + +#include +#include +#include "cxl.h" + +static int cxl_pci_probe_mode(struct pci_bus *bus) +{ + return PCI_PROBE_NORMAL; +} + +static int cxl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) +{ + return -ENODEV; +} + +static void cxl_teardown_msi_irqs(struct pci_dev *pdev) +{ + /* + * MSI should never be set but need still need to provide this call + * back. + */ +} + +static bool cxl_pci_enable_device_hook(struct pci_dev *dev) +{ + struct pci_controller *phb; + struct cxl_afu *afu; + struct cxl_context *ctx; + + phb = pci_bus_to_host(dev->bus); + afu = (struct cxl_afu *)phb->private_data; + + if (!cxl_ops->link_ok(afu->adapter, afu)) { + dev_warn(&dev->dev, "%s: Device link is down, refusing to enable AFU\n", __func__); + return false; + } + + dev->dev.archdata.dma_offset = PAGE_OFFSET; + + /* + * Allocate a context to do cxl things too. If we eventually do real + * DMA ops, we'll need a default context to attach them to + */ + ctx = cxl_dev_context_init(dev); + if (IS_ERR(ctx)) + return false; + dev->dev.archdata.cxl_ctx = ctx; + + return (cxl_ops->afu_check_and_enable(afu) == 0); +} + +static void cxl_pci_disable_device(struct pci_dev *dev) +{ + struct cxl_context *ctx = cxl_get_context(dev); + + if (ctx) { + if (ctx->status == STARTED) { + dev_err(&dev->dev, "Default context started\n"); + return; + } + dev->dev.archdata.cxl_ctx = NULL; + cxl_release_context(ctx); + } +} + +static void cxl_pci_reset_secondary_bus(struct pci_dev *dev) +{ + /* Should we do an AFU reset here ? */ +} + +static int cxl_pcie_cfg_record(u8 bus, u8 devfn) +{ + return (bus << 8) + devfn; +} + +static inline struct cxl_afu *pci_bus_to_afu(struct pci_bus *bus) +{ + struct pci_controller *phb = bus ? pci_bus_to_host(bus) : NULL; + + return phb ? phb->private_data : NULL; +} + +static void cxl_afu_configured_put(struct cxl_afu *afu) +{ + atomic_dec_if_positive(&afu->configured_state); +} + +static bool cxl_afu_configured_get(struct cxl_afu *afu) +{ + return atomic_inc_unless_negative(&afu->configured_state); +} + +static inline int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn, + struct cxl_afu *afu, int *_record) +{ + int record; + + record = cxl_pcie_cfg_record(bus->number, devfn); + if (record > afu->crs_num) + return PCIBIOS_DEVICE_NOT_FOUND; + + *_record = record; + return 0; +} + +static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 *val) +{ + int rc, record; + struct cxl_afu *afu; + u8 val8; + u16 val16; + u32 val32; + + afu = pci_bus_to_afu(bus); + /* Grab a reader lock on afu. */ + if (afu == NULL || !cxl_afu_configured_get(afu)) + return PCIBIOS_DEVICE_NOT_FOUND; + + rc = cxl_pcie_config_info(bus, devfn, afu, &record); + if (rc) + goto out; + + switch (len) { + case 1: + rc = cxl_ops->afu_cr_read8(afu, record, offset, &val8); + *val = val8; + break; + case 2: + rc = cxl_ops->afu_cr_read16(afu, record, offset, &val16); + *val = val16; + break; + case 4: + rc = cxl_ops->afu_cr_read32(afu, record, offset, &val32); + *val = val32; + break; + default: + WARN_ON(1); + } + +out: + cxl_afu_configured_put(afu); + return rc ? PCIBIOS_DEVICE_NOT_FOUND : 0; +} + +static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn, + int offset, int len, u32 val) +{ + int rc, record; + struct cxl_afu *afu; + + afu = pci_bus_to_afu(bus); + /* Grab a reader lock on afu. */ + if (afu == NULL || !cxl_afu_configured_get(afu)) + return PCIBIOS_DEVICE_NOT_FOUND; + + rc = cxl_pcie_config_info(bus, devfn, afu, &record); + if (rc) + goto out; + + switch (len) { + case 1: + rc = cxl_ops->afu_cr_write8(afu, record, offset, val & 0xff); + break; + case 2: + rc = cxl_ops->afu_cr_write16(afu, record, offset, val & 0xffff); + break; + case 4: + rc = cxl_ops->afu_cr_write32(afu, record, offset, val); + break; + default: + WARN_ON(1); + } + +out: + cxl_afu_configured_put(afu); + return rc ? PCIBIOS_SET_FAILED : 0; +} + +static struct pci_ops cxl_pcie_pci_ops = +{ + .read = cxl_pcie_read_config, + .write = cxl_pcie_write_config, +}; + + +static struct pci_controller_ops cxl_pci_controller_ops = +{ + .probe_mode = cxl_pci_probe_mode, + .enable_device_hook = cxl_pci_enable_device_hook, + .disable_device = cxl_pci_disable_device, + .release_device = cxl_pci_disable_device, + .reset_secondary_bus = cxl_pci_reset_secondary_bus, + .setup_msi_irqs = cxl_setup_msi_irqs, + .teardown_msi_irqs = cxl_teardown_msi_irqs, +}; + +int cxl_pci_vphb_add(struct cxl_afu *afu) +{ + struct pci_controller *phb; + struct device_node *vphb_dn; + struct device *parent; + + /* + * If there are no AFU configuration records we won't have anything to + * expose under the vPHB, so skip creating one, returning success since + * this is still a valid case. This will also opt us out of EEH + * handling since we won't have anything special to do if there are no + * kernel drivers attached to the vPHB, and EEH handling is not yet + * supported in the peer model. + */ + if (!afu->crs_num) + return 0; + + /* The parent device is the adapter. Reuse the device node of + * the adapter. + * We don't seem to care what device node is used for the vPHB, + * but tools such as lsvpd walk up the device parents looking + * for a valid location code, so we might as well show devices + * attached to the adapter as being located on that adapter. + */ + parent = afu->adapter->dev.parent; + vphb_dn = parent->of_node; + + /* Alloc and setup PHB data structure */ + phb = pcibios_alloc_controller(vphb_dn); + if (!phb) + return -ENODEV; + + /* Setup parent in sysfs */ + phb->parent = parent; + + /* Setup the PHB using arch provided callback */ + phb->ops = &cxl_pcie_pci_ops; + phb->cfg_addr = NULL; + phb->cfg_data = NULL; + phb->private_data = afu; + phb->controller_ops = cxl_pci_controller_ops; + + /* Scan the bus */ + pcibios_scan_phb(phb); + if (phb->bus == NULL) + return -ENXIO; + + /* Set release hook on root bus */ + pci_set_host_bridge_release(to_pci_host_bridge(phb->bus->bridge), + pcibios_free_controller_deferred, + (void *) phb); + + /* Claim resources. This might need some rework as well depending + * whether we are doing probe-only or not, like assigning unassigned + * resources etc... + */ + pcibios_claim_one_bus(phb->bus); + + /* Add probed PCI devices to the device model */ + pci_bus_add_devices(phb->bus); + + afu->phb = phb; + + return 0; +} + +void cxl_pci_vphb_remove(struct cxl_afu *afu) +{ + struct pci_controller *phb; + + /* If there is no configuration record we won't have one of these */ + if (!afu || !afu->phb) + return; + + phb = afu->phb; + afu->phb = NULL; + + pci_remove_root_bus(phb->bus); + /* + * We don't free phb here - that's handled by + * pcibios_free_controller_deferred() + */ +} + +bool cxl_pci_is_vphb_device(struct pci_dev *dev) +{ + struct pci_controller *phb; + + phb = pci_bus_to_host(dev->bus); + + return (phb->ops == &cxl_pcie_pci_ops); +} + +struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev) +{ + struct pci_controller *phb; + + phb = pci_bus_to_host(dev->bus); + + return (struct cxl_afu *)phb->private_data; +} +EXPORT_SYMBOL_GPL(cxl_pci_to_afu); + +unsigned int cxl_pci_to_cfg_record(struct pci_dev *dev) +{ + return cxl_pcie_cfg_record(dev->bus->number, dev->devfn); +} +EXPORT_SYMBOL_GPL(cxl_pci_to_cfg_record); -- cgit v1.2.3