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/plip/plip.c | 1440 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1440 insertions(+) create mode 100644 drivers/net/plip/plip.c (limited to 'drivers/net/plip/plip.c') diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c new file mode 100644 index 000000000..40ce8abe6 --- /dev/null +++ b/drivers/net/plip/plip.c @@ -0,0 +1,1440 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */ +/* PLIP: A parallel port "network" driver for Linux. */ +/* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */ +/* + * Authors: Donald Becker + * Tommy Thorn + * Tanabe Hiroyasu + * Alan Cox + * Peter Bauer <100136.3530@compuserve.com> + * Niibe Yutaka + * Nimrod Zimerman + * + * Enhancements: + * Modularization and ifreq/ifmap support by Alan Cox. + * Rewritten by Niibe Yutaka. + * parport-sharing awareness code by Philip Blundell. + * SMP locking by Niibe Yutaka. + * Support for parallel ports with no IRQ (poll mode), + * Modifications to use the parallel port API + * by Nimrod Zimerman. + * + * Fixes: + * Niibe Yutaka + * - Module initialization. + * - MTU fix. + * - Make sure other end is OK, before sending a packet. + * - Fix immediate timer problem. + * + * Al Viro + * - Changed {enable,disable}_irq handling to make it work + * with new ("stack") semantics. + */ + +/* + * Original version and the name 'PLIP' from Donald Becker + * inspired by Russ Nelson's parallel port packet driver. + * + * NOTE: + * Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0. + * Because of the necessity to communicate to DOS machines with the + * Crynwr packet driver, Peter Bauer changed the protocol again + * back to original protocol. + * + * This version follows original PLIP protocol. + * So, this PLIP can't communicate the PLIP of Linux v1.0. + */ + +/* + * To use with DOS box, please do (Turn on ARP switch): + * # ifconfig plip[0-2] arp + */ +static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n"; + +/* + Sources: + Ideas and protocols came from Russ Nelson's + "parallel.asm" parallel port packet driver. + + The "Crynwr" parallel port standard specifies the following protocol: + Trigger by sending nibble '0x8' (this causes interrupt on other end) + count-low octet + count-high octet + ... data octets + checksum octet + Each octet is sent as + >4)&0x0F)> + + The packet is encapsulated as if it were ethernet. + + The cable used is a de facto standard parallel null cable -- sold as + a "LapLink" cable by various places. You'll need a 12-conductor cable to + make one yourself. The wiring is: + SLCTIN 17 - 17 + GROUND 25 - 25 + D0->ERROR 2 - 15 15 - 2 + D1->SLCT 3 - 13 13 - 3 + D2->PAPOUT 4 - 12 12 - 4 + D3->ACK 5 - 10 10 - 5 + D4->BUSY 6 - 11 11 - 6 + Do not connect the other pins. They are + D5,D6,D7 are 7,8,9 + STROBE is 1, FEED is 14, INIT is 16 + extra grounds are 18,19,20,21,22,23,24 +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +/* Maximum number of devices to support. */ +#define PLIP_MAX 8 + +/* Use 0 for production, 1 for verification, >2 for debug */ +#ifndef NET_DEBUG +#define NET_DEBUG 1 +#endif +static const unsigned int net_debug = NET_DEBUG; + +#define ENABLE(irq) if (irq != -1) enable_irq(irq) +#define DISABLE(irq) if (irq != -1) disable_irq(irq) + +/* In micro second */ +#define PLIP_DELAY_UNIT 1 + +/* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ +#define PLIP_TRIGGER_WAIT 500 + +/* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ +#define PLIP_NIBBLE_WAIT 3000 + +/* Bottom halves */ +static void plip_kick_bh(struct work_struct *work); +static void plip_bh(struct work_struct *work); +static void plip_timer_bh(struct work_struct *work); + +/* Interrupt handler */ +static void plip_interrupt(void *dev_id); + +/* Functions for DEV methods */ +static netdev_tx_t plip_tx_packet(struct sk_buff *skb, struct net_device *dev); +static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned len); +static int plip_hard_header_cache(const struct neighbour *neigh, + struct hh_cache *hh, __be16 type); +static int plip_open(struct net_device *dev); +static int plip_close(struct net_device *dev); +static int plip_siocdevprivate(struct net_device *dev, struct ifreq *ifr, + void __user *data, int cmd); +static int plip_preempt(void *handle); +static void plip_wakeup(void *handle); + +enum plip_connection_state { + PLIP_CN_NONE=0, + PLIP_CN_RECEIVE, + PLIP_CN_SEND, + PLIP_CN_CLOSING, + PLIP_CN_ERROR +}; + +enum plip_packet_state { + PLIP_PK_DONE=0, + PLIP_PK_TRIGGER, + PLIP_PK_LENGTH_LSB, + PLIP_PK_LENGTH_MSB, + PLIP_PK_DATA, + PLIP_PK_CHECKSUM +}; + +enum plip_nibble_state { + PLIP_NB_BEGIN, + PLIP_NB_1, + PLIP_NB_2, +}; + +struct plip_local { + enum plip_packet_state state; + enum plip_nibble_state nibble; + union { + struct { +#if defined(__LITTLE_ENDIAN) + unsigned char lsb; + unsigned char msb; +#elif defined(__BIG_ENDIAN) + unsigned char msb; + unsigned char lsb; +#else +#error "Please fix the endianness defines in " +#endif + } b; + unsigned short h; + } length; + unsigned short byte; + unsigned char checksum; + unsigned char data; + struct sk_buff *skb; +}; + +struct net_local { + struct net_device *dev; + struct work_struct immediate; + struct delayed_work deferred; + struct delayed_work timer; + struct plip_local snd_data; + struct plip_local rcv_data; + struct pardevice *pardev; + unsigned long trigger; + unsigned long nibble; + enum plip_connection_state connection; + unsigned short timeout_count; + int is_deferred; + int port_owner; + int should_relinquish; + spinlock_t lock; + atomic_t kill_timer; + struct completion killed_timer_cmp; +}; + +static inline void enable_parport_interrupts (struct net_device *dev) +{ + if (dev->irq != -1) + { + struct parport *port = + ((struct net_local *)netdev_priv(dev))->pardev->port; + port->ops->enable_irq (port); + } +} + +static inline void disable_parport_interrupts (struct net_device *dev) +{ + if (dev->irq != -1) + { + struct parport *port = + ((struct net_local *)netdev_priv(dev))->pardev->port; + port->ops->disable_irq (port); + } +} + +static inline void write_data (struct net_device *dev, unsigned char data) +{ + struct parport *port = + ((struct net_local *)netdev_priv(dev))->pardev->port; + + port->ops->write_data (port, data); +} + +static inline unsigned char read_status (struct net_device *dev) +{ + struct parport *port = + ((struct net_local *)netdev_priv(dev))->pardev->port; + + return port->ops->read_status (port); +} + +static const struct header_ops plip_header_ops = { + .create = plip_hard_header, + .cache = plip_hard_header_cache, +}; + +static const struct net_device_ops plip_netdev_ops = { + .ndo_open = plip_open, + .ndo_stop = plip_close, + .ndo_start_xmit = plip_tx_packet, + .ndo_siocdevprivate = plip_siocdevprivate, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +/* Entry point of PLIP driver. + Probe the hardware, and register/initialize the driver. + + PLIP is rather weird, because of the way it interacts with the parport + system. It is _not_ initialised from Space.c. Instead, plip_init() + is called, and that function makes up a "struct net_device" for each port, and + then calls us here. + + */ +static void +plip_init_netdev(struct net_device *dev) +{ + static const u8 addr_init[ETH_ALEN] = { + 0xfc, 0xfc, 0xfc, + 0xfc, 0xfc, 0xfc, + }; + struct net_local *nl = netdev_priv(dev); + + /* Then, override parts of it */ + dev->tx_queue_len = 10; + dev->flags = IFF_POINTOPOINT|IFF_NOARP; + eth_hw_addr_set(dev, addr_init); + + dev->netdev_ops = &plip_netdev_ops; + dev->header_ops = &plip_header_ops; + + + nl->port_owner = 0; + + /* Initialize constants */ + nl->trigger = PLIP_TRIGGER_WAIT; + nl->nibble = PLIP_NIBBLE_WAIT; + + /* Initialize task queue structures */ + INIT_WORK(&nl->immediate, plip_bh); + INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh); + + if (dev->irq == -1) + INIT_DELAYED_WORK(&nl->timer, plip_timer_bh); + + spin_lock_init(&nl->lock); +} + +/* Bottom half handler for the delayed request. + This routine is kicked by do_timer(). + Request `plip_bh' to be invoked. */ +static void +plip_kick_bh(struct work_struct *work) +{ + struct net_local *nl = + container_of(work, struct net_local, deferred.work); + + if (nl->is_deferred) + schedule_work(&nl->immediate); +} + +/* Forward declarations of internal routines */ +static int plip_none(struct net_device *, struct net_local *, + struct plip_local *, struct plip_local *); +static int plip_receive_packet(struct net_device *, struct net_local *, + struct plip_local *, struct plip_local *); +static int plip_send_packet(struct net_device *, struct net_local *, + struct plip_local *, struct plip_local *); +static int plip_connection_close(struct net_device *, struct net_local *, + struct plip_local *, struct plip_local *); +static int plip_error(struct net_device *, struct net_local *, + struct plip_local *, struct plip_local *); +static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, + struct plip_local *rcv, + int error); + +#define OK 0 +#define TIMEOUT 1 +#define ERROR 2 +#define HS_TIMEOUT 3 + +typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv); + +static const plip_func connection_state_table[] = +{ + plip_none, + plip_receive_packet, + plip_send_packet, + plip_connection_close, + plip_error +}; + +/* Bottom half handler of PLIP. */ +static void +plip_bh(struct work_struct *work) +{ + struct net_local *nl = container_of(work, struct net_local, immediate); + struct plip_local *snd = &nl->snd_data; + struct plip_local *rcv = &nl->rcv_data; + plip_func f; + int r; + + nl->is_deferred = 0; + f = connection_state_table[nl->connection]; + if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK && + (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) { + nl->is_deferred = 1; + schedule_delayed_work(&nl->deferred, 1); + } +} + +static void +plip_timer_bh(struct work_struct *work) +{ + struct net_local *nl = + container_of(work, struct net_local, timer.work); + + if (!(atomic_read (&nl->kill_timer))) { + plip_interrupt (nl->dev); + + schedule_delayed_work(&nl->timer, 1); + } + else { + complete(&nl->killed_timer_cmp); + } +} + +static int +plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv, + int error) +{ + unsigned char c0; + /* + * This is tricky. If we got here from the beginning of send (either + * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's + * already disabled. With the old variant of {enable,disable}_irq() + * extra disable_irq() was a no-op. Now it became mortal - it's + * unbalanced and thus we'll never re-enable IRQ (until rmmod plip, + * that is). So we have to treat HS_TIMEOUT and ERROR from send + * in a special way. + */ + + spin_lock_irq(&nl->lock); + if (nl->connection == PLIP_CN_SEND) { + + if (error != ERROR) { /* Timeout */ + nl->timeout_count++; + if ((error == HS_TIMEOUT && nl->timeout_count <= 10) || + nl->timeout_count <= 3) { + spin_unlock_irq(&nl->lock); + /* Try again later */ + return TIMEOUT; + } + c0 = read_status(dev); + printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", + dev->name, snd->state, c0); + } else + error = HS_TIMEOUT; + dev->stats.tx_errors++; + dev->stats.tx_aborted_errors++; + } else if (nl->connection == PLIP_CN_RECEIVE) { + if (rcv->state == PLIP_PK_TRIGGER) { + /* Transmission was interrupted. */ + spin_unlock_irq(&nl->lock); + return OK; + } + if (error != ERROR) { /* Timeout */ + if (++nl->timeout_count <= 3) { + spin_unlock_irq(&nl->lock); + /* Try again later */ + return TIMEOUT; + } + c0 = read_status(dev); + printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", + dev->name, rcv->state, c0); + } + dev->stats.rx_dropped++; + } + rcv->state = PLIP_PK_DONE; + if (rcv->skb) { + dev_kfree_skb_irq(rcv->skb); + rcv->skb = NULL; + } + snd->state = PLIP_PK_DONE; + if (snd->skb) { + dev_consume_skb_irq(snd->skb); + snd->skb = NULL; + } + spin_unlock_irq(&nl->lock); + if (error == HS_TIMEOUT) { + DISABLE(dev->irq); + synchronize_irq(dev->irq); + } + disable_parport_interrupts (dev); + netif_stop_queue (dev); + nl->connection = PLIP_CN_ERROR; + write_data (dev, 0x00); + + return TIMEOUT; +} + +static int +plip_none(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv) +{ + return OK; +} + +/* PLIP_RECEIVE --- receive a byte(two nibbles) + Returns OK on success, TIMEOUT on timeout */ +static inline int +plip_receive(unsigned short nibble_timeout, struct net_device *dev, + enum plip_nibble_state *ns_p, unsigned char *data_p) +{ + unsigned char c0, c1; + unsigned int cx; + + switch (*ns_p) { + case PLIP_NB_BEGIN: + cx = nibble_timeout; + while (1) { + c0 = read_status(dev); + udelay(PLIP_DELAY_UNIT); + if ((c0 & 0x80) == 0) { + c1 = read_status(dev); + if (c0 == c1) + break; + } + if (--cx == 0) + return TIMEOUT; + } + *data_p = (c0 >> 3) & 0x0f; + write_data (dev, 0x10); /* send ACK */ + *ns_p = PLIP_NB_1; + fallthrough; + + case PLIP_NB_1: + cx = nibble_timeout; + while (1) { + c0 = read_status(dev); + udelay(PLIP_DELAY_UNIT); + if (c0 & 0x80) { + c1 = read_status(dev); + if (c0 == c1) + break; + } + if (--cx == 0) + return TIMEOUT; + } + *data_p |= (c0 << 1) & 0xf0; + write_data (dev, 0x00); /* send ACK */ + *ns_p = PLIP_NB_BEGIN; + break; + case PLIP_NB_2: + break; + } + return OK; +} + +/* + * Determine the packet's protocol ID. The rule here is that we + * assume 802.3 if the type field is short enough to be a length. + * This is normal practice and works for any 'now in use' protocol. + * + * PLIP is ethernet ish but the daddr might not be valid if unicast. + * PLIP fortunately has no bus architecture (its Point-to-point). + * + * We can't fix the daddr thing as that quirk (more bug) is embedded + * in far too many old systems not all even running Linux. + */ + +static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev) +{ + struct ethhdr *eth; + unsigned char *rawp; + + skb_reset_mac_header(skb); + skb_pull(skb,dev->hard_header_len); + eth = eth_hdr(skb); + + if(is_multicast_ether_addr(eth->h_dest)) + { + if(ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) + skb->pkt_type=PACKET_BROADCAST; + else + skb->pkt_type=PACKET_MULTICAST; + } + + /* + * This ALLMULTI check should be redundant by 1.4 + * so don't forget to remove it. + */ + + if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) + return eth->h_proto; + + rawp = skb->data; + + /* + * This is a magic hack to spot IPX packets. Older Novell breaks + * the protocol design and runs IPX over 802.3 without an 802.2 LLC + * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This + * won't work for fault tolerant netware but does for the rest. + */ + if (*(unsigned short *)rawp == 0xFFFF) + return htons(ETH_P_802_3); + + /* + * Real 802.2 LLC + */ + return htons(ETH_P_802_2); +} + +/* PLIP_RECEIVE_PACKET --- receive a packet */ +static int +plip_receive_packet(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv) +{ + unsigned short nibble_timeout = nl->nibble; + unsigned char *lbuf; + + switch (rcv->state) { + case PLIP_PK_TRIGGER: + DISABLE(dev->irq); + /* Don't need to synchronize irq, as we can safely ignore it */ + disable_parport_interrupts (dev); + write_data (dev, 0x01); /* send ACK */ + if (net_debug > 2) + printk(KERN_DEBUG "%s: receive start\n", dev->name); + rcv->state = PLIP_PK_LENGTH_LSB; + rcv->nibble = PLIP_NB_BEGIN; + fallthrough; + + case PLIP_PK_LENGTH_LSB: + if (snd->state != PLIP_PK_DONE) { + if (plip_receive(nl->trigger, dev, + &rcv->nibble, &rcv->length.b.lsb)) { + /* collision, here dev->tbusy == 1 */ + rcv->state = PLIP_PK_DONE; + nl->is_deferred = 1; + nl->connection = PLIP_CN_SEND; + schedule_delayed_work(&nl->deferred, 1); + enable_parport_interrupts (dev); + ENABLE(dev->irq); + return OK; + } + } else { + if (plip_receive(nibble_timeout, dev, + &rcv->nibble, &rcv->length.b.lsb)) + return TIMEOUT; + } + rcv->state = PLIP_PK_LENGTH_MSB; + fallthrough; + + case PLIP_PK_LENGTH_MSB: + if (plip_receive(nibble_timeout, dev, + &rcv->nibble, &rcv->length.b.msb)) + return TIMEOUT; + if (rcv->length.h > dev->mtu + dev->hard_header_len || + rcv->length.h < 8) { + printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); + return ERROR; + } + /* Malloc up new buffer. */ + rcv->skb = dev_alloc_skb(rcv->length.h + 2); + if (rcv->skb == NULL) { + printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); + return ERROR; + } + skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ + skb_put(rcv->skb,rcv->length.h); + rcv->skb->dev = dev; + rcv->state = PLIP_PK_DATA; + rcv->byte = 0; + rcv->checksum = 0; + fallthrough; + + case PLIP_PK_DATA: + lbuf = rcv->skb->data; + do { + if (plip_receive(nibble_timeout, dev, + &rcv->nibble, &lbuf[rcv->byte])) + return TIMEOUT; + } while (++rcv->byte < rcv->length.h); + do { + rcv->checksum += lbuf[--rcv->byte]; + } while (rcv->byte); + rcv->state = PLIP_PK_CHECKSUM; + fallthrough; + + case PLIP_PK_CHECKSUM: + if (plip_receive(nibble_timeout, dev, + &rcv->nibble, &rcv->data)) + return TIMEOUT; + if (rcv->data != rcv->checksum) { + dev->stats.rx_crc_errors++; + if (net_debug) + printk(KERN_DEBUG "%s: checksum error\n", dev->name); + return ERROR; + } + rcv->state = PLIP_PK_DONE; + fallthrough; + + case PLIP_PK_DONE: + /* Inform the upper layer for the arrival of a packet. */ + rcv->skb->protocol=plip_type_trans(rcv->skb, dev); + netif_rx(rcv->skb); + dev->stats.rx_bytes += rcv->length.h; + dev->stats.rx_packets++; + rcv->skb = NULL; + if (net_debug > 2) + printk(KERN_DEBUG "%s: receive end\n", dev->name); + + /* Close the connection. */ + write_data (dev, 0x00); + spin_lock_irq(&nl->lock); + if (snd->state != PLIP_PK_DONE) { + nl->connection = PLIP_CN_SEND; + spin_unlock_irq(&nl->lock); + schedule_work(&nl->immediate); + enable_parport_interrupts (dev); + ENABLE(dev->irq); + return OK; + } else { + nl->connection = PLIP_CN_NONE; + spin_unlock_irq(&nl->lock); + enable_parport_interrupts (dev); + ENABLE(dev->irq); + return OK; + } + } + return OK; +} + +/* PLIP_SEND --- send a byte (two nibbles) + Returns OK on success, TIMEOUT when timeout */ +static inline int +plip_send(unsigned short nibble_timeout, struct net_device *dev, + enum plip_nibble_state *ns_p, unsigned char data) +{ + unsigned char c0; + unsigned int cx; + + switch (*ns_p) { + case PLIP_NB_BEGIN: + write_data (dev, data & 0x0f); + *ns_p = PLIP_NB_1; + fallthrough; + + case PLIP_NB_1: + write_data (dev, 0x10 | (data & 0x0f)); + cx = nibble_timeout; + while (1) { + c0 = read_status(dev); + if ((c0 & 0x80) == 0) + break; + if (--cx == 0) + return TIMEOUT; + udelay(PLIP_DELAY_UNIT); + } + write_data (dev, 0x10 | (data >> 4)); + *ns_p = PLIP_NB_2; + fallthrough; + + case PLIP_NB_2: + write_data (dev, (data >> 4)); + cx = nibble_timeout; + while (1) { + c0 = read_status(dev); + if (c0 & 0x80) + break; + if (--cx == 0) + return TIMEOUT; + udelay(PLIP_DELAY_UNIT); + } + *ns_p = PLIP_NB_BEGIN; + return OK; + } + return OK; +} + +/* PLIP_SEND_PACKET --- send a packet */ +static int +plip_send_packet(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv) +{ + unsigned short nibble_timeout = nl->nibble; + unsigned char *lbuf; + unsigned char c0; + unsigned int cx; + + if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { + printk(KERN_DEBUG "%s: send skb lost\n", dev->name); + snd->state = PLIP_PK_DONE; + snd->skb = NULL; + return ERROR; + } + + switch (snd->state) { + case PLIP_PK_TRIGGER: + if ((read_status(dev) & 0xf8) != 0x80) + return HS_TIMEOUT; + + /* Trigger remote rx interrupt. */ + write_data (dev, 0x08); + cx = nl->trigger; + while (1) { + udelay(PLIP_DELAY_UNIT); + spin_lock_irq(&nl->lock); + if (nl->connection == PLIP_CN_RECEIVE) { + spin_unlock_irq(&nl->lock); + /* Interrupted. */ + dev->stats.collisions++; + return OK; + } + c0 = read_status(dev); + if (c0 & 0x08) { + spin_unlock_irq(&nl->lock); + DISABLE(dev->irq); + synchronize_irq(dev->irq); + if (nl->connection == PLIP_CN_RECEIVE) { + /* Interrupted. + We don't need to enable irq, + as it is soon disabled. */ + /* Yes, we do. New variant of + {enable,disable}_irq *counts* + them. -- AV */ + ENABLE(dev->irq); + dev->stats.collisions++; + return OK; + } + disable_parport_interrupts (dev); + if (net_debug > 2) + printk(KERN_DEBUG "%s: send start\n", dev->name); + snd->state = PLIP_PK_LENGTH_LSB; + snd->nibble = PLIP_NB_BEGIN; + nl->timeout_count = 0; + break; + } + spin_unlock_irq(&nl->lock); + if (--cx == 0) { + write_data (dev, 0x00); + return HS_TIMEOUT; + } + } + break; + + case PLIP_PK_LENGTH_LSB: + if (plip_send(nibble_timeout, dev, + &snd->nibble, snd->length.b.lsb)) + return TIMEOUT; + snd->state = PLIP_PK_LENGTH_MSB; + fallthrough; + + case PLIP_PK_LENGTH_MSB: + if (plip_send(nibble_timeout, dev, + &snd->nibble, snd->length.b.msb)) + return TIMEOUT; + snd->state = PLIP_PK_DATA; + snd->byte = 0; + snd->checksum = 0; + fallthrough; + + case PLIP_PK_DATA: + do { + if (plip_send(nibble_timeout, dev, + &snd->nibble, lbuf[snd->byte])) + return TIMEOUT; + } while (++snd->byte < snd->length.h); + do { + snd->checksum += lbuf[--snd->byte]; + } while (snd->byte); + snd->state = PLIP_PK_CHECKSUM; + fallthrough; + + case PLIP_PK_CHECKSUM: + if (plip_send(nibble_timeout, dev, + &snd->nibble, snd->checksum)) + return TIMEOUT; + + dev->stats.tx_bytes += snd->skb->len; + dev_kfree_skb(snd->skb); + dev->stats.tx_packets++; + snd->state = PLIP_PK_DONE; + fallthrough; + + case PLIP_PK_DONE: + /* Close the connection */ + write_data (dev, 0x00); + snd->skb = NULL; + if (net_debug > 2) + printk(KERN_DEBUG "%s: send end\n", dev->name); + nl->connection = PLIP_CN_CLOSING; + nl->is_deferred = 1; + schedule_delayed_work(&nl->deferred, 1); + enable_parport_interrupts (dev); + ENABLE(dev->irq); + return OK; + } + return OK; +} + +static int +plip_connection_close(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv) +{ + spin_lock_irq(&nl->lock); + if (nl->connection == PLIP_CN_CLOSING) { + nl->connection = PLIP_CN_NONE; + netif_wake_queue (dev); + } + spin_unlock_irq(&nl->lock); + if (nl->should_relinquish) { + nl->should_relinquish = nl->port_owner = 0; + parport_release(nl->pardev); + } + return OK; +} + +/* PLIP_ERROR --- wait till other end settled */ +static int +plip_error(struct net_device *dev, struct net_local *nl, + struct plip_local *snd, struct plip_local *rcv) +{ + unsigned char status; + + status = read_status(dev); + if ((status & 0xf8) == 0x80) { + if (net_debug > 2) + printk(KERN_DEBUG "%s: reset interface.\n", dev->name); + nl->connection = PLIP_CN_NONE; + nl->should_relinquish = 0; + netif_start_queue (dev); + enable_parport_interrupts (dev); + ENABLE(dev->irq); + netif_wake_queue (dev); + } else { + nl->is_deferred = 1; + schedule_delayed_work(&nl->deferred, 1); + } + + return OK; +} + +/* Handle the parallel port interrupts. */ +static void +plip_interrupt(void *dev_id) +{ + struct net_device *dev = dev_id; + struct net_local *nl; + struct plip_local *rcv; + unsigned char c0; + unsigned long flags; + + nl = netdev_priv(dev); + rcv = &nl->rcv_data; + + spin_lock_irqsave (&nl->lock, flags); + + c0 = read_status(dev); + if ((c0 & 0xf8) != 0xc0) { + if ((dev->irq != -1) && (net_debug > 1)) + printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); + spin_unlock_irqrestore (&nl->lock, flags); + return; + } + + if (net_debug > 3) + printk(KERN_DEBUG "%s: interrupt.\n", dev->name); + + switch (nl->connection) { + case PLIP_CN_CLOSING: + netif_wake_queue (dev); + fallthrough; + case PLIP_CN_NONE: + case PLIP_CN_SEND: + rcv->state = PLIP_PK_TRIGGER; + nl->connection = PLIP_CN_RECEIVE; + nl->timeout_count = 0; + schedule_work(&nl->immediate); + break; + + case PLIP_CN_RECEIVE: + /* May occur because there is race condition + around test and set of dev->interrupt. + Ignore this interrupt. */ + break; + + case PLIP_CN_ERROR: + printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); + break; + } + + spin_unlock_irqrestore(&nl->lock, flags); +} + +static netdev_tx_t +plip_tx_packet(struct sk_buff *skb, struct net_device *dev) +{ + struct net_local *nl = netdev_priv(dev); + struct plip_local *snd = &nl->snd_data; + + if (netif_queue_stopped(dev)) + return NETDEV_TX_BUSY; + + /* We may need to grab the bus */ + if (!nl->port_owner) { + if (parport_claim(nl->pardev)) + return NETDEV_TX_BUSY; + nl->port_owner = 1; + } + + netif_stop_queue (dev); + + if (skb->len > dev->mtu + dev->hard_header_len) { + printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); + netif_start_queue (dev); + return NETDEV_TX_BUSY; + } + + if (net_debug > 2) + printk(KERN_DEBUG "%s: send request\n", dev->name); + + spin_lock_irq(&nl->lock); + snd->skb = skb; + snd->length.h = skb->len; + snd->state = PLIP_PK_TRIGGER; + if (nl->connection == PLIP_CN_NONE) { + nl->connection = PLIP_CN_SEND; + nl->timeout_count = 0; + } + schedule_work(&nl->immediate); + spin_unlock_irq(&nl->lock); + + return NETDEV_TX_OK; +} + +static void +plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth) +{ + const struct in_device *in_dev; + + rcu_read_lock(); + in_dev = __in_dev_get_rcu(dev); + if (in_dev) { + /* Any address will do - we take the first */ + const struct in_ifaddr *ifa = rcu_dereference(in_dev->ifa_list); + if (ifa) { + memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); + memset(eth->h_dest, 0xfc, 2); + memcpy(eth->h_dest+2, &ifa->ifa_address, 4); + } + } + rcu_read_unlock(); +} + +static int +plip_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned len) +{ + int ret; + + ret = eth_header(skb, dev, type, daddr, saddr, len); + if (ret >= 0) + plip_rewrite_address (dev, (struct ethhdr *)skb->data); + + return ret; +} + +static int plip_hard_header_cache(const struct neighbour *neigh, + struct hh_cache *hh, __be16 type) +{ + int ret; + + ret = eth_header_cache(neigh, hh, type); + if (ret == 0) { + struct ethhdr *eth; + + eth = (struct ethhdr*)(((u8*)hh->hh_data) + + HH_DATA_OFF(sizeof(*eth))); + plip_rewrite_address (neigh->dev, eth); + } + + return ret; +} + +/* Open/initialize the board. This is called (in the current kernel) + sometime after booting when the 'ifconfig' program is run. + + This routine gets exclusive access to the parallel port by allocating + its IRQ line. + */ +static int +plip_open(struct net_device *dev) +{ + struct net_local *nl = netdev_priv(dev); + struct in_device *in_dev; + + /* Grab the port */ + if (!nl->port_owner) { + if (parport_claim(nl->pardev)) return -EAGAIN; + nl->port_owner = 1; + } + + nl->should_relinquish = 0; + + /* Clear the data port. */ + write_data (dev, 0x00); + + /* Enable rx interrupt. */ + enable_parport_interrupts (dev); + if (dev->irq == -1) + { + atomic_set (&nl->kill_timer, 0); + schedule_delayed_work(&nl->timer, 1); + } + + /* Initialize the state machine. */ + nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; + nl->rcv_data.skb = nl->snd_data.skb = NULL; + nl->connection = PLIP_CN_NONE; + nl->is_deferred = 0; + + /* Fill in the MAC-level header. + We used to abuse dev->broadcast to store the point-to-point + MAC address, but we no longer do it. Instead, we fetch the + interface address whenever it is needed, which is cheap enough + because we use the hh_cache. Actually, abusing dev->broadcast + didn't work, because when using plip_open the point-to-point + address isn't yet known. + PLIP doesn't have a real MAC address, but we need it to be + DOS compatible, and to properly support taps (otherwise, + when the device address isn't identical to the address of a + received frame, the kernel incorrectly drops it). */ + + in_dev=__in_dev_get_rtnl(dev); + if (in_dev) { + /* Any address will do - we take the first. We already + have the first two bytes filled with 0xfc, from + plip_init_dev(). */ + const struct in_ifaddr *ifa = rtnl_dereference(in_dev->ifa_list); + if (ifa != NULL) { + dev_addr_mod(dev, 2, &ifa->ifa_local, 4); + } + } + + netif_start_queue (dev); + + return 0; +} + +/* The inverse routine to plip_open (). */ +static int +plip_close(struct net_device *dev) +{ + struct net_local *nl = netdev_priv(dev); + struct plip_local *snd = &nl->snd_data; + struct plip_local *rcv = &nl->rcv_data; + + netif_stop_queue (dev); + DISABLE(dev->irq); + synchronize_irq(dev->irq); + + if (dev->irq == -1) + { + init_completion(&nl->killed_timer_cmp); + atomic_set (&nl->kill_timer, 1); + wait_for_completion(&nl->killed_timer_cmp); + } + +#ifdef NOTDEF + outb(0x00, PAR_DATA(dev)); +#endif + nl->is_deferred = 0; + nl->connection = PLIP_CN_NONE; + if (nl->port_owner) { + parport_release(nl->pardev); + nl->port_owner = 0; + } + + snd->state = PLIP_PK_DONE; + if (snd->skb) { + dev_kfree_skb(snd->skb); + snd->skb = NULL; + } + rcv->state = PLIP_PK_DONE; + if (rcv->skb) { + kfree_skb(rcv->skb); + rcv->skb = NULL; + } + +#ifdef NOTDEF + /* Reset. */ + outb(0x00, PAR_CONTROL(dev)); +#endif + return 0; +} + +static int +plip_preempt(void *handle) +{ + struct net_device *dev = (struct net_device *)handle; + struct net_local *nl = netdev_priv(dev); + + /* Stand our ground if a datagram is on the wire */ + if (nl->connection != PLIP_CN_NONE) { + nl->should_relinquish = 1; + return 1; + } + + nl->port_owner = 0; /* Remember that we released the bus */ + return 0; +} + +static void +plip_wakeup(void *handle) +{ + struct net_device *dev = (struct net_device *)handle; + struct net_local *nl = netdev_priv(dev); + + if (nl->port_owner) { + /* Why are we being woken up? */ + printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); + if (!parport_claim(nl->pardev)) + /* bus_owner is already set (but why?) */ + printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); + else + return; + } + + if (!(dev->flags & IFF_UP)) + /* Don't need the port when the interface is down */ + return; + + if (!parport_claim(nl->pardev)) { + nl->port_owner = 1; + /* Clear the data port. */ + write_data (dev, 0x00); + } +} + +static int +plip_siocdevprivate(struct net_device *dev, struct ifreq *rq, + void __user *data, int cmd) +{ + struct net_local *nl = netdev_priv(dev); + struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; + + if (cmd != SIOCDEVPLIP) + return -EOPNOTSUPP; + + if (in_compat_syscall()) + return -EOPNOTSUPP; + + switch(pc->pcmd) { + case PLIP_GET_TIMEOUT: + pc->trigger = nl->trigger; + pc->nibble = nl->nibble; + break; + case PLIP_SET_TIMEOUT: + if(!capable(CAP_NET_ADMIN)) + return -EPERM; + nl->trigger = pc->trigger; + nl->nibble = pc->nibble; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; +static int timid; + +module_param_array(parport, int, NULL, 0); +module_param(timid, int, 0); +MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); + +static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; + +static inline int +plip_searchfor(int list[], int a) +{ + int i; + for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { + if (list[i] == a) return 1; + } + return 0; +} + +/* plip_attach() is called (by the parport code) when a port is + * available to use. */ +static void plip_attach (struct parport *port) +{ + static int unit; + struct net_device *dev; + struct net_local *nl; + char name[IFNAMSIZ]; + struct pardev_cb plip_cb; + + if ((parport[0] == -1 && (!timid || !port->devices)) || + plip_searchfor(parport, port->number)) { + if (unit == PLIP_MAX) { + printk(KERN_ERR "plip: too many devices\n"); + return; + } + + sprintf(name, "plip%d", unit); + dev = alloc_etherdev(sizeof(struct net_local)); + if (!dev) + return; + + strcpy(dev->name, name); + + dev->irq = port->irq; + dev->base_addr = port->base; + if (port->irq == -1) { + printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," + "which is fairly inefficient!\n", port->name); + } + + nl = netdev_priv(dev); + nl->dev = dev; + + memset(&plip_cb, 0, sizeof(plip_cb)); + plip_cb.private = dev; + plip_cb.preempt = plip_preempt; + plip_cb.wakeup = plip_wakeup; + plip_cb.irq_func = plip_interrupt; + + nl->pardev = parport_register_dev_model(port, dev->name, + &plip_cb, unit); + + if (!nl->pardev) { + printk(KERN_ERR "%s: parport_register failed\n", name); + goto err_free_dev; + } + + plip_init_netdev(dev); + + if (register_netdev(dev)) { + printk(KERN_ERR "%s: network register failed\n", name); + goto err_parport_unregister; + } + + printk(KERN_INFO "%s", version); + if (dev->irq != -1) + printk(KERN_INFO "%s: Parallel port at %#3lx, " + "using IRQ %d.\n", + dev->name, dev->base_addr, dev->irq); + else + printk(KERN_INFO "%s: Parallel port at %#3lx, " + "not using IRQ.\n", + dev->name, dev->base_addr); + dev_plip[unit++] = dev; + } + return; + +err_parport_unregister: + parport_unregister_device(nl->pardev); +err_free_dev: + free_netdev(dev); +} + +/* plip_detach() is called (by the parport code) when a port is + * no longer available to use. */ +static void plip_detach (struct parport *port) +{ + /* Nothing to do */ +} + +static int plip_probe(struct pardevice *par_dev) +{ + struct device_driver *drv = par_dev->dev.driver; + int len = strlen(drv->name); + + if (strncmp(par_dev->name, drv->name, len)) + return -ENODEV; + + return 0; +} + +static struct parport_driver plip_driver = { + .name = "plip", + .probe = plip_probe, + .match_port = plip_attach, + .detach = plip_detach, + .devmodel = true, +}; + +static void __exit plip_cleanup_module (void) +{ + struct net_device *dev; + int i; + + for (i=0; i < PLIP_MAX; i++) { + if ((dev = dev_plip[i])) { + struct net_local *nl = netdev_priv(dev); + unregister_netdev(dev); + if (nl->port_owner) + parport_release(nl->pardev); + parport_unregister_device(nl->pardev); + free_netdev(dev); + dev_plip[i] = NULL; + } + } + + parport_unregister_driver(&plip_driver); +} + +#ifndef MODULE + +static int parport_ptr; + +static int __init plip_setup(char *str) +{ + int ints[4]; + + str = get_options(str, ARRAY_SIZE(ints), ints); + + /* Ugh. */ + if (!strncmp(str, "parport", 7)) { + int n = simple_strtoul(str+7, NULL, 10); + if (parport_ptr < PLIP_MAX) + parport[parport_ptr++] = n; + else + printk(KERN_INFO "plip: too many ports, %s ignored.\n", + str); + } else if (!strcmp(str, "timid")) { + timid = 1; + } else { + if (ints[0] == 0 || ints[1] == 0) { + /* disable driver on "plip=" or "plip=0" */ + parport[0] = -2; + } else { + printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n", + ints[1]); + } + } + return 1; +} + +__setup("plip=", plip_setup); + +#endif /* !MODULE */ + +static int __init plip_init (void) +{ + if (parport[0] == -2) + return 0; + + if (parport[0] != -1 && timid) { + printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n"); + timid = 0; + } + + if (parport_register_driver (&plip_driver)) { + printk (KERN_WARNING "plip: couldn't register driver\n"); + return 1; + } + + return 0; +} + +module_init(plip_init); +module_exit(plip_cleanup_module); +MODULE_LICENSE("GPL"); -- cgit v1.2.3