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/net/ethernet/litex/litex_liteeth.c | 312 +++++++++++++++++++++++++++++ 1 file changed, 312 insertions(+) create mode 100644 drivers/net/ethernet/litex/litex_liteeth.c (limited to 'drivers/net/ethernet/litex/litex_liteeth.c') diff --git a/drivers/net/ethernet/litex/litex_liteeth.c b/drivers/net/ethernet/litex/litex_liteeth.c new file mode 100644 index 000000000..35f24e0f0 --- /dev/null +++ b/drivers/net/ethernet/litex/litex_liteeth.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * LiteX Liteeth Ethernet + * + * Copyright 2017 Joel Stanley + * + */ + +#include +#include +#include +#include +#include +#include + +#define LITEETH_WRITER_SLOT 0x00 +#define LITEETH_WRITER_LENGTH 0x04 +#define LITEETH_WRITER_ERRORS 0x08 +#define LITEETH_WRITER_EV_STATUS 0x0C +#define LITEETH_WRITER_EV_PENDING 0x10 +#define LITEETH_WRITER_EV_ENABLE 0x14 +#define LITEETH_READER_START 0x18 +#define LITEETH_READER_READY 0x1C +#define LITEETH_READER_LEVEL 0x20 +#define LITEETH_READER_SLOT 0x24 +#define LITEETH_READER_LENGTH 0x28 +#define LITEETH_READER_EV_STATUS 0x2C +#define LITEETH_READER_EV_PENDING 0x30 +#define LITEETH_READER_EV_ENABLE 0x34 +#define LITEETH_PREAMBLE_CRC 0x38 +#define LITEETH_PREAMBLE_ERRORS 0x3C +#define LITEETH_CRC_ERRORS 0x40 + +#define LITEETH_PHY_CRG_RESET 0x00 +#define LITEETH_MDIO_W 0x04 +#define LITEETH_MDIO_R 0x0C + +#define DRV_NAME "liteeth" + +struct liteeth { + void __iomem *base; + struct net_device *netdev; + struct device *dev; + u32 slot_size; + + /* Tx */ + u32 tx_slot; + u32 num_tx_slots; + void __iomem *tx_base; + + /* Rx */ + u32 rx_slot; + u32 num_rx_slots; + void __iomem *rx_base; +}; + +static int liteeth_rx(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + struct sk_buff *skb; + unsigned char *data; + u8 rx_slot; + int len; + + rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT); + len = litex_read32(priv->base + LITEETH_WRITER_LENGTH); + + if (len == 0 || len > 2048) + goto rx_drop; + + skb = netdev_alloc_skb_ip_align(netdev, len); + if (!skb) { + netdev_err(netdev, "couldn't get memory\n"); + goto rx_drop; + } + + data = skb_put(skb, len); + memcpy_fromio(data, priv->rx_base + rx_slot * priv->slot_size, len); + skb->protocol = eth_type_trans(skb, netdev); + + netdev->stats.rx_packets++; + netdev->stats.rx_bytes += len; + + return netif_rx(skb); + +rx_drop: + netdev->stats.rx_dropped++; + netdev->stats.rx_errors++; + + return NET_RX_DROP; +} + +static irqreturn_t liteeth_interrupt(int irq, void *dev_id) +{ + struct net_device *netdev = dev_id; + struct liteeth *priv = netdev_priv(netdev); + u8 reg; + + reg = litex_read8(priv->base + LITEETH_READER_EV_PENDING); + if (reg) { + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + litex_write8(priv->base + LITEETH_READER_EV_PENDING, reg); + } + + reg = litex_read8(priv->base + LITEETH_WRITER_EV_PENDING); + if (reg) { + liteeth_rx(netdev); + litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, reg); + } + + return IRQ_HANDLED; +} + +static int liteeth_open(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + int err; + + /* Clear pending events */ + litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1); + litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1); + + err = request_irq(netdev->irq, liteeth_interrupt, 0, netdev->name, netdev); + if (err) { + netdev_err(netdev, "failed to request irq %d\n", netdev->irq); + return err; + } + + /* Enable IRQs */ + litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 1); + litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 1); + + netif_carrier_on(netdev); + netif_start_queue(netdev); + + return 0; +} + +static int liteeth_stop(struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + + netif_stop_queue(netdev); + netif_carrier_off(netdev); + + litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0); + litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0); + + free_irq(netdev->irq, netdev); + + return 0; +} + +static netdev_tx_t liteeth_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct liteeth *priv = netdev_priv(netdev); + void __iomem *txbuffer; + + if (!litex_read8(priv->base + LITEETH_READER_READY)) { + if (net_ratelimit()) + netdev_err(netdev, "LITEETH_READER_READY not ready\n"); + + netif_stop_queue(netdev); + + return NETDEV_TX_BUSY; + } + + /* Reject oversize packets */ + if (unlikely(skb->len > priv->slot_size)) { + if (net_ratelimit()) + netdev_err(netdev, "tx packet too big\n"); + + dev_kfree_skb_any(skb); + netdev->stats.tx_dropped++; + netdev->stats.tx_errors++; + + return NETDEV_TX_OK; + } + + txbuffer = priv->tx_base + priv->tx_slot * priv->slot_size; + memcpy_toio(txbuffer, skb->data, skb->len); + litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot); + litex_write16(priv->base + LITEETH_READER_LENGTH, skb->len); + litex_write8(priv->base + LITEETH_READER_START, 1); + + netdev->stats.tx_bytes += skb->len; + netdev->stats.tx_packets++; + + priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots; + dev_kfree_skb_any(skb); + + return NETDEV_TX_OK; +} + +static const struct net_device_ops liteeth_netdev_ops = { + .ndo_open = liteeth_open, + .ndo_stop = liteeth_stop, + .ndo_start_xmit = liteeth_start_xmit, +}; + +static void liteeth_setup_slots(struct liteeth *priv) +{ + struct device_node *np = priv->dev->of_node; + int err; + + err = of_property_read_u32(np, "litex,rx-slots", &priv->num_rx_slots); + if (err) { + dev_dbg(priv->dev, "unable to get litex,rx-slots, using 2\n"); + priv->num_rx_slots = 2; + } + + err = of_property_read_u32(np, "litex,tx-slots", &priv->num_tx_slots); + if (err) { + dev_dbg(priv->dev, "unable to get litex,tx-slots, using 2\n"); + priv->num_tx_slots = 2; + } + + err = of_property_read_u32(np, "litex,slot-size", &priv->slot_size); + if (err) { + dev_dbg(priv->dev, "unable to get litex,slot-size, using 0x800\n"); + priv->slot_size = 0x800; + } +} + +static int liteeth_probe(struct platform_device *pdev) +{ + struct net_device *netdev; + void __iomem *buf_base; + struct liteeth *priv; + int irq, err; + + netdev = devm_alloc_etherdev(&pdev->dev, sizeof(*priv)); + if (!netdev) + return -ENOMEM; + + SET_NETDEV_DEV(netdev, &pdev->dev); + platform_set_drvdata(pdev, netdev); + + priv = netdev_priv(netdev); + priv->netdev = netdev; + priv->dev = &pdev->dev; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + netdev->irq = irq; + + priv->base = devm_platform_ioremap_resource_byname(pdev, "mac"); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + buf_base = devm_platform_ioremap_resource_byname(pdev, "buffer"); + if (IS_ERR(buf_base)) + return PTR_ERR(buf_base); + + liteeth_setup_slots(priv); + + /* Rx slots */ + priv->rx_base = buf_base; + priv->rx_slot = 0; + + /* Tx slots come after Rx slots */ + priv->tx_base = buf_base + priv->num_rx_slots * priv->slot_size; + priv->tx_slot = 0; + + err = of_get_ethdev_address(pdev->dev.of_node, netdev); + if (err) + eth_hw_addr_random(netdev); + + netdev->netdev_ops = &liteeth_netdev_ops; + + err = register_netdev(netdev); + if (err) { + dev_err(&pdev->dev, "Failed to register netdev %d\n", err); + return err; + } + + netdev_info(netdev, "irq %d slots: tx %d rx %d size %d\n", + netdev->irq, priv->num_tx_slots, priv->num_rx_slots, priv->slot_size); + + return 0; +} + +static int liteeth_remove(struct platform_device *pdev) +{ + struct net_device *netdev = platform_get_drvdata(pdev); + + unregister_netdev(netdev); + + return 0; +} + +static const struct of_device_id liteeth_of_match[] = { + { .compatible = "litex,liteeth" }, + { } +}; +MODULE_DEVICE_TABLE(of, liteeth_of_match); + +static struct platform_driver liteeth_driver = { + .probe = liteeth_probe, + .remove = liteeth_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = liteeth_of_match, + }, +}; +module_platform_driver(liteeth_driver); + +MODULE_AUTHOR("Joel Stanley "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3