/* * Linux ARCnet driver - device-independent routines * * Written 1997 by David Woodhouse. * Written 1994-1999 by Avery Pennarun. * Written 1999-2000 by Martin Mares <[email protected]>. * Derived from skeleton.c by Donald Becker. * * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) * for sponsoring the further development of this driver. * * ********************** * * The original copyright was as follows: * * skeleton.c Written 1993 by Donald Becker. * Copyright 1993 United States Government as represented by the * Director, National Security Agency. This software may only be used * and distributed according to the terms of the GNU General Public License as * modified by SRC, incorporated herein by reference. * * ********************** * * The change log is now in a file called ChangeLog in this directory. * * Sources: * - Crynwr arcnet.com/arcether.com packet drivers. * - arcnet.c v0.00 dated 1/1/94 and apparently by * Donald Becker - it didn't work :) * - skeleton.c v0.05 dated 11/16/93 by Donald Becker * (from Linux Kernel 1.1.45) * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet * - The official ARCnet COM9026 data sheets (!) thanks to * Ken Cornetet <[email protected]> * - The official ARCnet COM20020 data sheets. * - Information on some more obscure ARCnet controller chips, thanks * to the nice people at SMSC. * - net/inet/eth.c (from kernel 1.1.50) for header-building info. * - Alternate Linux ARCnet source by V.Shergin <[email protected]> * - Textual information and more alternate source from Joachim Koenig * <[email protected]> */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <net/arp.h> #include <linux/init.h> #include <linux/jiffies.h> #include <linux/errqueue.h> #include <linux/leds.h> #include <linux/workqueue.h> #include "arcdevice.h" #include "com9026.h" /* "do nothing" functions for protocol drivers */ static void null_rx(struct net_device *dev, int bufnum, struct archdr *pkthdr, int length); static int null_build_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, uint8_t daddr); static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, int length, int bufnum); static void arcnet_rx(struct net_device *dev, int bufnum); /* one ArcProto per possible proto ID. None of the elements of * arc_proto_map are allowed to be NULL; they will get set to * arc_proto_default instead. It also must not be NULL; if you would like * to set it to NULL, set it to &arc_proto_null instead. */ struct ArcProto *arc_proto_map[256]; EXPORT_SYMBOL(…); struct ArcProto *arc_proto_default; EXPORT_SYMBOL(…); struct ArcProto *arc_bcast_proto; EXPORT_SYMBOL(…); struct ArcProto *arc_raw_proto; EXPORT_SYMBOL(…); static struct ArcProto arc_proto_null = …; /* Exported function prototypes */ int arcnet_debug = …; EXPORT_SYMBOL(…); /* Internal function prototypes */ static int arcnet_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len); static int go_tx(struct net_device *dev); static int debug = …; module_param(debug, int, 0); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; static int __init arcnet_init(void) { … } static void __exit arcnet_exit(void) { … } module_init(…) …; module_exit(arcnet_exit); /* Dump the contents of an sk_buff */ #if ARCNET_DEBUG_MAX & D_SKB void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc) { char hdr[32]; /* dump the packet */ snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc); print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 16, 1, skb->data, skb->len, true); } EXPORT_SYMBOL(arcnet_dump_skb); #endif /* Dump the contents of an ARCnet buffer */ #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) static void arcnet_dump_packet(struct net_device *dev, int bufnum, char *desc, int take_arcnet_lock) { struct arcnet_local *lp = netdev_priv(dev); int i, length; unsigned long flags = 0; static uint8_t buf[512]; char hdr[32]; /* hw.copy_from_card expects IRQ context so take the IRQ lock * to keep it single threaded */ if (take_arcnet_lock) spin_lock_irqsave(&lp->lock, flags); lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); if (take_arcnet_lock) spin_unlock_irqrestore(&lp->lock, flags); /* if the offset[0] byte is nonzero, this is a 256-byte packet */ length = (buf[2] ? 256 : 512); /* dump the packet */ snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 16, 1, buf, length, true); } #else #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) … #endif /* Trigger a LED event in response to a ARCNET device event */ void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event) { … } EXPORT_SYMBOL_GPL(…); static void arcnet_led_release(struct device *gendev, void *res) { … } /* Register ARCNET LED triggers for a arcnet device * * This is normally called from a driver's probe function */ void devm_arcnet_led_init(struct net_device *netdev, int index, int subid) { … } EXPORT_SYMBOL_GPL(…); /* Unregister a protocol driver from the arc_proto_map. Protocol drivers * are responsible for registering themselves, but the unregister routine * is pretty generic so we'll do it here. */ void arcnet_unregister_proto(struct ArcProto *proto) { … } EXPORT_SYMBOL(…); /* Add a buffer to the queue. Only the interrupt handler is allowed to do * this, unless interrupts are disabled. * * Note: we don't check for a full queue, since there aren't enough buffers * to more than fill it. */ static void release_arcbuf(struct net_device *dev, int bufnum) { … } /* Get a buffer from the queue. * If this returns -1, there are no buffers available. */ static int get_arcbuf(struct net_device *dev) { … } static int choose_mtu(void) { … } static const struct header_ops arcnet_header_ops = …; static const struct net_device_ops arcnet_netdev_ops = …; /* Setup a struct device for ARCnet. */ static void arcdev_setup(struct net_device *dev) { … } static void arcnet_timer(struct timer_list *t) { … } static void reset_device_work(struct work_struct *work) { … } static void arcnet_reply_work(struct work_struct *t) { struct arcnet_local *lp = from_work(lp, t, reply_work); struct sk_buff *ackskb, *skb; struct sock_exterr_skb *serr; struct sock *sk; int ret; local_irq_disable(); skb = lp->outgoing.skb; if (!skb || !skb->sk) { local_irq_enable(); return; } sock_hold(skb->sk); sk = skb->sk; ackskb = skb_clone_sk(skb); sock_put(skb->sk); if (!ackskb) { local_irq_enable(); return; } serr = SKB_EXT_ERR(ackskb); memset(serr, 0, sizeof(*serr)); serr->ee.ee_errno = ENOMSG; serr->ee.ee_origin = SO_EE_ORIGIN_TXSTATUS; serr->ee.ee_data = skb_shinfo(skb)->tskey; serr->ee.ee_info = lp->reply_status; /* finally erasing outgoing skb */ dev_kfree_skb(lp->outgoing.skb); lp->outgoing.skb = NULL; ackskb->dev = lp->dev; ret = sock_queue_err_skb(sk, ackskb); if (ret) dev_kfree_skb_irq(ackskb); local_irq_enable(); }; struct net_device *alloc_arcdev(const char *name) { … } EXPORT_SYMBOL(…); void free_arcdev(struct net_device *dev) { … } EXPORT_SYMBOL(…); /* Open/initialize the board. This is called sometime after booting when * the 'ifconfig' program is run. * * This routine should set everything up anew at each open, even registers * that "should" only need to be set once at boot, so that there is * non-reboot way to recover if something goes wrong. */ int arcnet_open(struct net_device *dev) { … } EXPORT_SYMBOL(…); /* The inverse routine to arcnet_open - shuts down the card. */ int arcnet_close(struct net_device *dev) { … } EXPORT_SYMBOL(…); static int arcnet_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned len) { … } /* Called by the kernel in order to transmit a packet. */ netdev_tx_t arcnet_send_packet(struct sk_buff *skb, struct net_device *dev) { … } EXPORT_SYMBOL(…); /* Actually start transmitting a packet that was loaded into a buffer * by prepare_tx. This should _only_ be called by the interrupt handler. */ static int go_tx(struct net_device *dev) { … } /* Called by the kernel when transmit times out */ void arcnet_timeout(struct net_device *dev, unsigned int txqueue) { … } EXPORT_SYMBOL(…); /* The typical workload of the driver: Handle the network interface * interrupts. Establish which device needs attention, and call the correct * chipset interrupt handler. */ irqreturn_t arcnet_interrupt(int irq, void *dev_id) { … } EXPORT_SYMBOL(…); /* This is a generic packet receiver that calls arcnet??_rx depending on the * protocol ID found. */ static void arcnet_rx(struct net_device *dev, int bufnum) { … } static void null_rx(struct net_device *dev, int bufnum, struct archdr *pkthdr, int length) { … } static int null_build_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, uint8_t daddr) { … } /* the "do nothing" prepare_tx function warns that there's nothing to do. */ static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, int length, int bufnum) { … }
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