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1219 lines
33 KiB
1219 lines
33 KiB
/* |
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* Linux ARCnet driver - device-independent routines |
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* |
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* Written 1997 by David Woodhouse. |
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* Written 1994-1999 by Avery Pennarun. |
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* Written 1999-2000 by Martin Mares <[email protected]>. |
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* Derived from skeleton.c by Donald Becker. |
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* |
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) |
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* for sponsoring the further development of this driver. |
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* |
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* ********************** |
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* |
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* The original copyright was as follows: |
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* |
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* skeleton.c Written 1993 by Donald Becker. |
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* Copyright 1993 United States Government as represented by the |
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* Director, National Security Agency. This software may only be used |
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* and distributed according to the terms of the GNU General Public License as |
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* modified by SRC, incorporated herein by reference. |
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* |
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* ********************** |
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* |
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* The change log is now in a file called ChangeLog in this directory. |
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* |
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* Sources: |
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* - Crynwr arcnet.com/arcether.com packet drivers. |
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* - arcnet.c v0.00 dated 1/1/94 and apparently by |
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* Donald Becker - it didn't work :) |
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* - skeleton.c v0.05 dated 11/16/93 by Donald Becker |
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* (from Linux Kernel 1.1.45) |
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* - RFC's 1201 and 1051 - re: TCP/IP over ARCnet |
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* - The official ARCnet COM9026 data sheets (!) thanks to |
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* Ken Cornetet <[email protected]> |
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* - The official ARCnet COM20020 data sheets. |
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* - Information on some more obscure ARCnet controller chips, thanks |
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* to the nice people at SMSC. |
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* - net/inet/eth.c (from kernel 1.1.50) for header-building info. |
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* - Alternate Linux ARCnet source by V.Shergin <[email protected]> |
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* - Textual information and more alternate source from Joachim Koenig |
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* <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/delay.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <net/arp.h> |
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#include <linux/init.h> |
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#include <linux/jiffies.h> |
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#include <linux/errqueue.h> |
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|
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#include <linux/leds.h> |
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|
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#include "arcdevice.h" |
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#include "com9026.h" |
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|
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/* "do nothing" functions for protocol drivers */ |
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static void null_rx(struct net_device *dev, int bufnum, |
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struct archdr *pkthdr, int length); |
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static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, uint8_t daddr); |
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static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, |
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int length, int bufnum); |
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|
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static void arcnet_rx(struct net_device *dev, int bufnum); |
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|
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/* one ArcProto per possible proto ID. None of the elements of |
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* arc_proto_map are allowed to be NULL; they will get set to |
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* arc_proto_default instead. It also must not be NULL; if you would like |
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* to set it to NULL, set it to &arc_proto_null instead. |
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*/ |
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struct ArcProto *arc_proto_map[256]; |
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EXPORT_SYMBOL(arc_proto_map); |
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|
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struct ArcProto *arc_proto_default; |
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EXPORT_SYMBOL(arc_proto_default); |
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|
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struct ArcProto *arc_bcast_proto; |
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EXPORT_SYMBOL(arc_bcast_proto); |
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|
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struct ArcProto *arc_raw_proto; |
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EXPORT_SYMBOL(arc_raw_proto); |
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|
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static struct ArcProto arc_proto_null = { |
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.suffix = '?', |
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.mtu = XMTU, |
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.is_ip = 0, |
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.rx = null_rx, |
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.build_header = null_build_header, |
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.prepare_tx = null_prepare_tx, |
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.continue_tx = NULL, |
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.ack_tx = NULL |
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}; |
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|
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/* Exported function prototypes */ |
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int arcnet_debug = ARCNET_DEBUG; |
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EXPORT_SYMBOL(arcnet_debug); |
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|
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/* Internal function prototypes */ |
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static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, const void *daddr, |
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const void *saddr, unsigned len); |
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static int go_tx(struct net_device *dev); |
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|
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static int debug = ARCNET_DEBUG; |
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module_param(debug, int, 0); |
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MODULE_LICENSE("GPL"); |
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|
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static int __init arcnet_init(void) |
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{ |
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int count; |
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|
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arcnet_debug = debug; |
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|
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pr_info("arcnet loaded\n"); |
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|
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/* initialize the protocol map */ |
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arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; |
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for (count = 0; count < 256; count++) |
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arc_proto_map[count] = arc_proto_default; |
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|
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if (BUGLVL(D_DURING)) |
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pr_info("struct sizes: %zd %zd %zd %zd %zd\n", |
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sizeof(struct arc_hardware), |
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sizeof(struct arc_rfc1201), |
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sizeof(struct arc_rfc1051), |
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sizeof(struct arc_eth_encap), |
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sizeof(struct archdr)); |
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|
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return 0; |
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} |
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|
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static void __exit arcnet_exit(void) |
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{ |
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} |
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|
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module_init(arcnet_init); |
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module_exit(arcnet_exit); |
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|
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/* Dump the contents of an sk_buff */ |
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#if ARCNET_DEBUG_MAX & D_SKB |
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void arcnet_dump_skb(struct net_device *dev, |
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struct sk_buff *skb, char *desc) |
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{ |
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char hdr[32]; |
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|
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/* dump the packet */ |
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snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc); |
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print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, |
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16, 1, skb->data, skb->len, true); |
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} |
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EXPORT_SYMBOL(arcnet_dump_skb); |
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#endif |
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|
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/* Dump the contents of an ARCnet buffer */ |
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#if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) |
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static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
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char *desc, int take_arcnet_lock) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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int i, length; |
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unsigned long flags = 0; |
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static uint8_t buf[512]; |
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char hdr[32]; |
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|
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/* hw.copy_from_card expects IRQ context so take the IRQ lock |
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* to keep it single threaded |
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*/ |
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if (take_arcnet_lock) |
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spin_lock_irqsave(&lp->lock, flags); |
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|
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lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); |
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if (take_arcnet_lock) |
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spin_unlock_irqrestore(&lp->lock, flags); |
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|
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/* if the offset[0] byte is nonzero, this is a 256-byte packet */ |
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length = (buf[2] ? 256 : 512); |
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|
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/* dump the packet */ |
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snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); |
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print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, |
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16, 1, buf, length, true); |
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} |
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|
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#else |
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|
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#define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) |
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|
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#endif |
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|
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/* Trigger a LED event in response to a ARCNET device event */ |
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void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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unsigned long led_delay = 350; |
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unsigned long tx_delay = 50; |
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|
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switch (event) { |
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case ARCNET_LED_EVENT_RECON: |
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led_trigger_blink_oneshot(lp->recon_led_trig, |
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&led_delay, &led_delay, 0); |
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break; |
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case ARCNET_LED_EVENT_OPEN: |
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led_trigger_event(lp->tx_led_trig, LED_OFF); |
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led_trigger_event(lp->recon_led_trig, LED_OFF); |
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break; |
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case ARCNET_LED_EVENT_STOP: |
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led_trigger_event(lp->tx_led_trig, LED_OFF); |
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led_trigger_event(lp->recon_led_trig, LED_OFF); |
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break; |
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case ARCNET_LED_EVENT_TX: |
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led_trigger_blink_oneshot(lp->tx_led_trig, |
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&tx_delay, &tx_delay, 0); |
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break; |
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} |
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} |
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EXPORT_SYMBOL_GPL(arcnet_led_event); |
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|
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static void arcnet_led_release(struct device *gendev, void *res) |
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{ |
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struct arcnet_local *lp = netdev_priv(to_net_dev(gendev)); |
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|
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led_trigger_unregister_simple(lp->tx_led_trig); |
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led_trigger_unregister_simple(lp->recon_led_trig); |
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} |
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|
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/* Register ARCNET LED triggers for a arcnet device |
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* |
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* This is normally called from a driver's probe function |
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*/ |
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void devm_arcnet_led_init(struct net_device *netdev, int index, int subid) |
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{ |
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struct arcnet_local *lp = netdev_priv(netdev); |
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void *res; |
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|
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res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL); |
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if (!res) { |
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netdev_err(netdev, "cannot register LED triggers\n"); |
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return; |
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} |
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|
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snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name), |
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"arc%d-%d-tx", index, subid); |
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snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name), |
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"arc%d-%d-recon", index, subid); |
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|
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led_trigger_register_simple(lp->tx_led_trig_name, |
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&lp->tx_led_trig); |
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led_trigger_register_simple(lp->recon_led_trig_name, |
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&lp->recon_led_trig); |
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|
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devres_add(&netdev->dev, res); |
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} |
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EXPORT_SYMBOL_GPL(devm_arcnet_led_init); |
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|
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/* Unregister a protocol driver from the arc_proto_map. Protocol drivers |
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* are responsible for registering themselves, but the unregister routine |
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* is pretty generic so we'll do it here. |
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*/ |
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void arcnet_unregister_proto(struct ArcProto *proto) |
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{ |
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int count; |
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|
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if (arc_proto_default == proto) |
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arc_proto_default = &arc_proto_null; |
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if (arc_bcast_proto == proto) |
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arc_bcast_proto = arc_proto_default; |
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if (arc_raw_proto == proto) |
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arc_raw_proto = arc_proto_default; |
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|
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for (count = 0; count < 256; count++) { |
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if (arc_proto_map[count] == proto) |
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arc_proto_map[count] = arc_proto_default; |
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} |
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} |
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EXPORT_SYMBOL(arcnet_unregister_proto); |
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|
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/* Add a buffer to the queue. Only the interrupt handler is allowed to do |
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* this, unless interrupts are disabled. |
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* |
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* Note: we don't check for a full queue, since there aren't enough buffers |
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* to more than fill it. |
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*/ |
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static void release_arcbuf(struct net_device *dev, int bufnum) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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int i; |
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|
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lp->buf_queue[lp->first_free_buf++] = bufnum; |
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lp->first_free_buf %= 5; |
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|
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if (BUGLVL(D_DURING)) { |
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arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ", |
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bufnum); |
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for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
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arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); |
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arc_cont(D_DURING, "\n"); |
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} |
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} |
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|
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/* Get a buffer from the queue. |
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* If this returns -1, there are no buffers available. |
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*/ |
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static int get_arcbuf(struct net_device *dev) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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int buf = -1, i; |
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|
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if (!atomic_dec_and_test(&lp->buf_lock)) { |
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/* already in this function */ |
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arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n", |
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lp->buf_lock.counter); |
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} else { /* we can continue */ |
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if (lp->next_buf >= 5) |
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lp->next_buf -= 5; |
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|
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if (lp->next_buf == lp->first_free_buf) { |
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arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n"); |
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} else { |
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buf = lp->buf_queue[lp->next_buf++]; |
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lp->next_buf %= 5; |
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} |
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} |
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|
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if (BUGLVL(D_DURING)) { |
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arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ", |
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buf); |
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for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
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arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); |
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arc_cont(D_DURING, "\n"); |
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} |
|
|
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atomic_inc(&lp->buf_lock); |
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return buf; |
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} |
|
|
|
static int choose_mtu(void) |
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{ |
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int count, mtu = 65535; |
|
|
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/* choose the smallest MTU of all available encaps */ |
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for (count = 0; count < 256; count++) { |
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if (arc_proto_map[count] != &arc_proto_null && |
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arc_proto_map[count]->mtu < mtu) { |
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mtu = arc_proto_map[count]->mtu; |
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} |
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} |
|
|
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return mtu == 65535 ? XMTU : mtu; |
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} |
|
|
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static const struct header_ops arcnet_header_ops = { |
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.create = arcnet_header, |
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}; |
|
|
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static const struct net_device_ops arcnet_netdev_ops = { |
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.ndo_open = arcnet_open, |
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.ndo_stop = arcnet_close, |
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.ndo_start_xmit = arcnet_send_packet, |
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.ndo_tx_timeout = arcnet_timeout, |
|
}; |
|
|
|
/* Setup a struct device for ARCnet. */ |
|
static void arcdev_setup(struct net_device *dev) |
|
{ |
|
dev->type = ARPHRD_ARCNET; |
|
dev->netdev_ops = &arcnet_netdev_ops; |
|
dev->header_ops = &arcnet_header_ops; |
|
dev->hard_header_len = sizeof(struct arc_hardware); |
|
dev->mtu = choose_mtu(); |
|
|
|
dev->addr_len = ARCNET_ALEN; |
|
dev->tx_queue_len = 100; |
|
dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ |
|
dev->watchdog_timeo = TX_TIMEOUT; |
|
|
|
/* New-style flags. */ |
|
dev->flags = IFF_BROADCAST; |
|
} |
|
|
|
static void arcnet_timer(struct timer_list *t) |
|
{ |
|
struct arcnet_local *lp = from_timer(lp, t, timer); |
|
struct net_device *dev = lp->dev; |
|
|
|
spin_lock_irq(&lp->lock); |
|
|
|
if (!lp->reset_in_progress && !netif_carrier_ok(dev)) { |
|
netif_carrier_on(dev); |
|
netdev_info(dev, "link up\n"); |
|
} |
|
|
|
spin_unlock_irq(&lp->lock); |
|
} |
|
|
|
static void reset_device_work(struct work_struct *work) |
|
{ |
|
struct arcnet_local *lp; |
|
struct net_device *dev; |
|
|
|
lp = container_of(work, struct arcnet_local, reset_work); |
|
dev = lp->dev; |
|
|
|
/* Do not bring the network interface back up if an ifdown |
|
* was already done. |
|
*/ |
|
if (!netif_running(dev) || !lp->reset_in_progress) |
|
return; |
|
|
|
rtnl_lock(); |
|
|
|
/* Do another check, in case of an ifdown that was triggered in |
|
* the small race window between the exit condition above and |
|
* acquiring RTNL. |
|
*/ |
|
if (!netif_running(dev) || !lp->reset_in_progress) |
|
goto out; |
|
|
|
dev_close(dev); |
|
dev_open(dev, NULL); |
|
|
|
out: |
|
rtnl_unlock(); |
|
} |
|
|
|
static void arcnet_reply_tasklet(struct tasklet_struct *t) |
|
{ |
|
struct arcnet_local *lp = from_tasklet(lp, t, reply_tasklet); |
|
|
|
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) |
|
kfree_skb(ackskb); |
|
|
|
local_irq_enable(); |
|
}; |
|
|
|
struct net_device *alloc_arcdev(const char *name) |
|
{ |
|
struct net_device *dev; |
|
|
|
dev = alloc_netdev(sizeof(struct arcnet_local), |
|
name && *name ? name : "arc%d", NET_NAME_UNKNOWN, |
|
arcdev_setup); |
|
if (dev) { |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
|
|
lp->dev = dev; |
|
spin_lock_init(&lp->lock); |
|
timer_setup(&lp->timer, arcnet_timer, 0); |
|
INIT_WORK(&lp->reset_work, reset_device_work); |
|
} |
|
|
|
return dev; |
|
} |
|
EXPORT_SYMBOL(alloc_arcdev); |
|
|
|
void free_arcdev(struct net_device *dev) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
|
|
/* Do not cancel this at ->ndo_close(), as the workqueue itself |
|
* indirectly calls the ifdown path through dev_close(). |
|
*/ |
|
cancel_work_sync(&lp->reset_work); |
|
free_netdev(dev); |
|
} |
|
EXPORT_SYMBOL(free_arcdev); |
|
|
|
/* 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) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
int count, newmtu, error; |
|
|
|
arc_printk(D_INIT, dev, "opened."); |
|
|
|
if (!try_module_get(lp->hw.owner)) |
|
return -ENODEV; |
|
|
|
if (BUGLVL(D_PROTO)) { |
|
arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ", |
|
arc_proto_default->suffix); |
|
for (count = 0; count < 256; count++) |
|
arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix); |
|
arc_cont(D_PROTO, "\n"); |
|
} |
|
|
|
tasklet_setup(&lp->reply_tasklet, arcnet_reply_tasklet); |
|
|
|
arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n"); |
|
|
|
/* try to put the card in a defined state - if it fails the first |
|
* time, actually reset it. |
|
*/ |
|
error = -ENODEV; |
|
if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1)) |
|
goto out_module_put; |
|
|
|
newmtu = choose_mtu(); |
|
if (newmtu < dev->mtu) |
|
dev->mtu = newmtu; |
|
|
|
arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu); |
|
|
|
/* autodetect the encapsulation for each host. */ |
|
memset(lp->default_proto, 0, sizeof(lp->default_proto)); |
|
|
|
/* the broadcast address is special - use the 'bcast' protocol */ |
|
for (count = 0; count < 256; count++) { |
|
if (arc_proto_map[count] == arc_bcast_proto) { |
|
lp->default_proto[0] = count; |
|
break; |
|
} |
|
} |
|
|
|
/* initialize buffers */ |
|
atomic_set(&lp->buf_lock, 1); |
|
|
|
lp->next_buf = lp->first_free_buf = 0; |
|
release_arcbuf(dev, 0); |
|
release_arcbuf(dev, 1); |
|
release_arcbuf(dev, 2); |
|
release_arcbuf(dev, 3); |
|
lp->cur_tx = lp->next_tx = -1; |
|
lp->cur_rx = -1; |
|
|
|
lp->rfc1201.sequence = 1; |
|
|
|
/* bring up the hardware driver */ |
|
if (lp->hw.open) |
|
lp->hw.open(dev); |
|
|
|
if (dev->dev_addr[0] == 0) |
|
arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n"); |
|
else if (dev->dev_addr[0] == 255) |
|
arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n"); |
|
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
|
if (lp->hw.status(dev) & RESETflag) { |
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", |
|
__FILE__, __LINE__, __func__); |
|
lp->hw.command(dev, CFLAGScmd | RESETclear); |
|
} |
|
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
|
/* make sure we're ready to receive IRQ's. */ |
|
lp->hw.intmask(dev, 0); |
|
udelay(1); /* give it time to set the mask before |
|
* we reset it again. (may not even be |
|
* necessary) |
|
*/ |
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
|
lp->intmask = NORXflag | RECONflag; |
|
lp->hw.intmask(dev, lp->intmask); |
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
|
|
|
netif_carrier_off(dev); |
|
netif_start_queue(dev); |
|
mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000)); |
|
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN); |
|
return 0; |
|
|
|
out_module_put: |
|
module_put(lp->hw.owner); |
|
return error; |
|
} |
|
EXPORT_SYMBOL(arcnet_open); |
|
|
|
/* The inverse routine to arcnet_open - shuts down the card. */ |
|
int arcnet_close(struct net_device *dev) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_STOP); |
|
del_timer_sync(&lp->timer); |
|
|
|
netif_stop_queue(dev); |
|
netif_carrier_off(dev); |
|
|
|
tasklet_kill(&lp->reply_tasklet); |
|
|
|
/* flush TX and disable RX */ |
|
lp->hw.intmask(dev, 0); |
|
lp->hw.command(dev, NOTXcmd); /* stop transmit */ |
|
lp->hw.command(dev, NORXcmd); /* disable receive */ |
|
mdelay(1); |
|
|
|
/* shut down the card */ |
|
lp->hw.close(dev); |
|
|
|
/* reset counters */ |
|
lp->reset_in_progress = 0; |
|
|
|
module_put(lp->hw.owner); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(arcnet_close); |
|
|
|
static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
|
unsigned short type, const void *daddr, |
|
const void *saddr, unsigned len) |
|
{ |
|
const struct arcnet_local *lp = netdev_priv(dev); |
|
uint8_t _daddr, proto_num; |
|
struct ArcProto *proto; |
|
|
|
arc_printk(D_DURING, dev, |
|
"create header from %d to %d; protocol %d (%Xh); size %u.\n", |
|
saddr ? *(uint8_t *)saddr : -1, |
|
daddr ? *(uint8_t *)daddr : -1, |
|
type, type, len); |
|
|
|
if (skb->len != 0 && len != skb->len) |
|
arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", |
|
skb->len, len); |
|
|
|
/* Type is host order - ? */ |
|
if (type == ETH_P_ARCNET) { |
|
proto = arc_raw_proto; |
|
arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n", |
|
proto->suffix); |
|
_daddr = daddr ? *(uint8_t *)daddr : 0; |
|
} else if (!daddr) { |
|
/* if the dest addr isn't provided, we can't choose an |
|
* encapsulation! Store the packet type (eg. ETH_P_IP) |
|
* for now, and we'll push on a real header when we do |
|
* rebuild_header. |
|
*/ |
|
*(uint16_t *)skb_push(skb, 2) = type; |
|
/* XXX: Why not use skb->mac_len? */ |
|
if (skb->network_header - skb->mac_header != 2) |
|
arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n", |
|
skb->network_header - skb->mac_header); |
|
return -2; /* return error -- can't transmit yet! */ |
|
} else { |
|
/* otherwise, we can just add the header as usual. */ |
|
_daddr = *(uint8_t *)daddr; |
|
proto_num = lp->default_proto[_daddr]; |
|
proto = arc_proto_map[proto_num]; |
|
arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n", |
|
proto_num, proto->suffix); |
|
if (proto == &arc_proto_null && arc_bcast_proto != proto) { |
|
arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n", |
|
arc_bcast_proto->suffix); |
|
proto = arc_bcast_proto; |
|
} |
|
} |
|
return proto->build_header(skb, dev, type, _daddr); |
|
} |
|
|
|
/* Called by the kernel in order to transmit a packet. */ |
|
netdev_tx_t arcnet_send_packet(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
struct archdr *pkt; |
|
struct arc_rfc1201 *soft; |
|
struct ArcProto *proto; |
|
int txbuf; |
|
unsigned long flags; |
|
int retval; |
|
|
|
arc_printk(D_DURING, dev, |
|
"transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", |
|
lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); |
|
|
|
pkt = (struct archdr *)skb->data; |
|
soft = &pkt->soft.rfc1201; |
|
proto = arc_proto_map[soft->proto]; |
|
|
|
arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n", |
|
skb->len, pkt->hard.dest); |
|
if (BUGLVL(D_SKB)) |
|
arcnet_dump_skb(dev, skb, "tx"); |
|
|
|
/* fits in one packet? */ |
|
if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { |
|
arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n"); |
|
dev_kfree_skb(skb); |
|
return NETDEV_TX_OK; /* don't try again */ |
|
} |
|
|
|
/* We're busy transmitting a packet... */ |
|
netif_stop_queue(dev); |
|
|
|
spin_lock_irqsave(&lp->lock, flags); |
|
lp->hw.intmask(dev, 0); |
|
if (lp->next_tx == -1) |
|
txbuf = get_arcbuf(dev); |
|
else |
|
txbuf = -1; |
|
|
|
if (txbuf != -1) { |
|
lp->outgoing.skb = skb; |
|
if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && |
|
!proto->ack_tx) { |
|
/* done right away and we don't want to acknowledge |
|
* the package later - forget about it now |
|
*/ |
|
dev->stats.tx_bytes += skb->len; |
|
} else { |
|
/* do it the 'split' way */ |
|
lp->outgoing.proto = proto; |
|
lp->outgoing.skb = skb; |
|
lp->outgoing.pkt = pkt; |
|
|
|
if (proto->continue_tx && |
|
proto->continue_tx(dev, txbuf)) { |
|
arc_printk(D_NORMAL, dev, |
|
"bug! continue_tx finished the first time! (proto='%c')\n", |
|
proto->suffix); |
|
} |
|
} |
|
retval = NETDEV_TX_OK; |
|
lp->next_tx = txbuf; |
|
} else { |
|
retval = NETDEV_TX_BUSY; |
|
} |
|
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", |
|
__FILE__, __LINE__, __func__, lp->hw.status(dev)); |
|
/* make sure we didn't ignore a TX IRQ while we were in here */ |
|
lp->hw.intmask(dev, 0); |
|
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
|
lp->intmask |= TXFREEflag | EXCNAKflag; |
|
lp->hw.intmask(dev, lp->intmask); |
|
arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", |
|
__FILE__, __LINE__, __func__, lp->hw.status(dev)); |
|
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_TX); |
|
|
|
spin_unlock_irqrestore(&lp->lock, flags); |
|
return retval; /* no need to try again */ |
|
} |
|
EXPORT_SYMBOL(arcnet_send_packet); |
|
|
|
/* 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) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
|
|
arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", |
|
lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx); |
|
|
|
if (lp->cur_tx != -1 || lp->next_tx == -1) |
|
return 0; |
|
|
|
if (BUGLVL(D_TX)) |
|
arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); |
|
|
|
lp->cur_tx = lp->next_tx; |
|
lp->next_tx = -1; |
|
|
|
/* start sending */ |
|
lp->hw.command(dev, TXcmd | (lp->cur_tx << 3)); |
|
|
|
dev->stats.tx_packets++; |
|
lp->lasttrans_dest = lp->lastload_dest; |
|
lp->lastload_dest = 0; |
|
lp->excnak_pending = 0; |
|
lp->intmask |= TXFREEflag | EXCNAKflag; |
|
|
|
return 1; |
|
} |
|
|
|
/* Called by the kernel when transmit times out */ |
|
void arcnet_timeout(struct net_device *dev, unsigned int txqueue) |
|
{ |
|
unsigned long flags; |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
int status = lp->hw.status(dev); |
|
char *msg; |
|
|
|
spin_lock_irqsave(&lp->lock, flags); |
|
if (status & TXFREEflag) { /* transmit _DID_ finish */ |
|
msg = " - missed IRQ?"; |
|
} else { |
|
msg = ""; |
|
dev->stats.tx_aborted_errors++; |
|
lp->timed_out = 1; |
|
lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3)); |
|
} |
|
dev->stats.tx_errors++; |
|
|
|
/* make sure we didn't miss a TX or a EXC NAK IRQ */ |
|
lp->hw.intmask(dev, 0); |
|
lp->intmask |= TXFREEflag | EXCNAKflag; |
|
lp->hw.intmask(dev, lp->intmask); |
|
|
|
spin_unlock_irqrestore(&lp->lock, flags); |
|
|
|
if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { |
|
arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", |
|
msg, status, lp->intmask, lp->lasttrans_dest); |
|
lp->last_timeout = jiffies; |
|
} |
|
|
|
if (lp->cur_tx == -1) |
|
netif_wake_queue(dev); |
|
} |
|
EXPORT_SYMBOL(arcnet_timeout); |
|
|
|
/* 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) |
|
{ |
|
struct net_device *dev = dev_id; |
|
struct arcnet_local *lp; |
|
int recbuf, status, diagstatus, didsomething, boguscount; |
|
unsigned long flags; |
|
int retval = IRQ_NONE; |
|
|
|
arc_printk(D_DURING, dev, "\n"); |
|
|
|
arc_printk(D_DURING, dev, "in arcnet_interrupt\n"); |
|
|
|
lp = netdev_priv(dev); |
|
BUG_ON(!lp); |
|
|
|
spin_lock_irqsave(&lp->lock, flags); |
|
|
|
if (lp->reset_in_progress) |
|
goto out; |
|
|
|
/* RESET flag was enabled - if device is not running, we must |
|
* clear it right away (but nothing else). |
|
*/ |
|
if (!netif_running(dev)) { |
|
if (lp->hw.status(dev) & RESETflag) |
|
lp->hw.command(dev, CFLAGScmd | RESETclear); |
|
lp->hw.intmask(dev, 0); |
|
spin_unlock_irqrestore(&lp->lock, flags); |
|
return retval; |
|
} |
|
|
|
arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", |
|
lp->hw.status(dev), lp->intmask); |
|
|
|
boguscount = 5; |
|
do { |
|
status = lp->hw.status(dev); |
|
diagstatus = (status >> 8) & 0xFF; |
|
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n", |
|
__FILE__, __LINE__, __func__, status); |
|
didsomething = 0; |
|
|
|
/* RESET flag was enabled - card is resetting and if RX is |
|
* disabled, it's NOT because we just got a packet. |
|
* |
|
* The card is in an undefined state. |
|
* Clear it out and start over. |
|
*/ |
|
if (status & RESETflag) { |
|
arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n", |
|
status); |
|
|
|
lp->reset_in_progress = 1; |
|
netif_stop_queue(dev); |
|
netif_carrier_off(dev); |
|
schedule_work(&lp->reset_work); |
|
|
|
/* get out of the interrupt handler! */ |
|
goto out; |
|
} |
|
/* RX is inhibited - we must have received something. |
|
* Prepare to receive into the next buffer. |
|
* |
|
* We don't actually copy the received packet from the card |
|
* until after the transmit handler runs (and possibly |
|
* launches the next tx); this should improve latency slightly |
|
* if we get both types of interrupts at once. |
|
*/ |
|
recbuf = -1; |
|
if (status & lp->intmask & NORXflag) { |
|
recbuf = lp->cur_rx; |
|
arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n", |
|
recbuf, status); |
|
|
|
lp->cur_rx = get_arcbuf(dev); |
|
if (lp->cur_rx != -1) { |
|
arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n", |
|
lp->cur_rx); |
|
lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts); |
|
} |
|
didsomething++; |
|
} |
|
|
|
if ((diagstatus & EXCNAKflag)) { |
|
arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n", |
|
diagstatus); |
|
|
|
lp->hw.command(dev, NOTXcmd); /* disable transmit */ |
|
lp->excnak_pending = 1; |
|
|
|
lp->hw.command(dev, EXCNAKclear); |
|
lp->intmask &= ~(EXCNAKflag); |
|
didsomething++; |
|
} |
|
|
|
/* a transmit finished, and we're interested in it. */ |
|
if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { |
|
int ackstatus; |
|
lp->intmask &= ~(TXFREEflag | EXCNAKflag); |
|
|
|
if (status & TXACKflag) |
|
ackstatus = 2; |
|
else if (lp->excnak_pending) |
|
ackstatus = 1; |
|
else |
|
ackstatus = 0; |
|
|
|
arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n", |
|
status); |
|
|
|
if (lp->cur_tx != -1 && !lp->timed_out) { |
|
if (!(status & TXACKflag)) { |
|
if (lp->lasttrans_dest != 0) { |
|
arc_printk(D_EXTRA, dev, |
|
"transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n", |
|
status, |
|
lp->lasttrans_dest); |
|
dev->stats.tx_errors++; |
|
dev->stats.tx_carrier_errors++; |
|
} else { |
|
arc_printk(D_DURING, dev, |
|
"broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n", |
|
status, |
|
lp->lasttrans_dest); |
|
} |
|
} |
|
|
|
if (lp->outgoing.proto && |
|
lp->outgoing.proto->ack_tx) { |
|
lp->outgoing.proto |
|
->ack_tx(dev, ackstatus); |
|
} |
|
lp->reply_status = ackstatus; |
|
tasklet_hi_schedule(&lp->reply_tasklet); |
|
} |
|
if (lp->cur_tx != -1) |
|
release_arcbuf(dev, lp->cur_tx); |
|
|
|
lp->cur_tx = -1; |
|
lp->timed_out = 0; |
|
didsomething++; |
|
|
|
/* send another packet if there is one */ |
|
go_tx(dev); |
|
|
|
/* continue a split packet, if any */ |
|
if (lp->outgoing.proto && |
|
lp->outgoing.proto->continue_tx) { |
|
int txbuf = get_arcbuf(dev); |
|
|
|
if (txbuf != -1) { |
|
if (lp->outgoing.proto->continue_tx(dev, txbuf)) { |
|
/* that was the last segment */ |
|
dev->stats.tx_bytes += lp->outgoing.skb->len; |
|
if (!lp->outgoing.proto->ack_tx) { |
|
dev_kfree_skb_irq(lp->outgoing.skb); |
|
lp->outgoing.proto = NULL; |
|
} |
|
} |
|
lp->next_tx = txbuf; |
|
} |
|
} |
|
/* inform upper layers of idleness, if necessary */ |
|
if (lp->cur_tx == -1) |
|
netif_wake_queue(dev); |
|
} |
|
/* now process the received packet, if any */ |
|
if (recbuf != -1) { |
|
if (BUGLVL(D_RX)) |
|
arcnet_dump_packet(dev, recbuf, "rx irq", 0); |
|
|
|
arcnet_rx(dev, recbuf); |
|
release_arcbuf(dev, recbuf); |
|
|
|
didsomething++; |
|
} |
|
if (status & lp->intmask & RECONflag) { |
|
lp->hw.command(dev, CFLAGScmd | CONFIGclear); |
|
dev->stats.tx_carrier_errors++; |
|
|
|
arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n", |
|
status); |
|
if (netif_carrier_ok(dev)) { |
|
netif_carrier_off(dev); |
|
netdev_info(dev, "link down\n"); |
|
} |
|
mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000)); |
|
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_RECON); |
|
/* MYRECON bit is at bit 7 of diagstatus */ |
|
if (diagstatus & 0x80) |
|
arc_printk(D_RECON, dev, "Put out that recon myself\n"); |
|
|
|
/* is the RECON info empty or old? */ |
|
if (!lp->first_recon || !lp->last_recon || |
|
time_after(jiffies, lp->last_recon + HZ * 10)) { |
|
if (lp->network_down) |
|
arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n"); |
|
lp->first_recon = lp->last_recon = jiffies; |
|
lp->num_recons = lp->network_down = 0; |
|
|
|
arc_printk(D_DURING, dev, "recon: clearing counters.\n"); |
|
} else { /* add to current RECON counter */ |
|
lp->last_recon = jiffies; |
|
lp->num_recons++; |
|
|
|
arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n", |
|
lp->num_recons, |
|
(lp->last_recon - lp->first_recon) / HZ, |
|
lp->network_down); |
|
|
|
/* if network is marked up; |
|
* and first_recon and last_recon are 60+ apart; |
|
* and the average no. of recons counted is |
|
* > RECON_THRESHOLD/min; |
|
* then print a warning message. |
|
*/ |
|
if (!lp->network_down && |
|
(lp->last_recon - lp->first_recon) <= HZ * 60 && |
|
lp->num_recons >= RECON_THRESHOLD) { |
|
lp->network_down = 1; |
|
arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n"); |
|
} else if (!lp->network_down && |
|
lp->last_recon - lp->first_recon > HZ * 60) { |
|
/* reset counters if we've gone for |
|
* over a minute. |
|
*/ |
|
lp->first_recon = lp->last_recon; |
|
lp->num_recons = 1; |
|
} |
|
} |
|
} else if (lp->network_down && |
|
time_after(jiffies, lp->last_recon + HZ * 10)) { |
|
if (lp->network_down) |
|
arc_printk(D_NORMAL, dev, "cabling restored?\n"); |
|
lp->first_recon = lp->last_recon = 0; |
|
lp->num_recons = lp->network_down = 0; |
|
|
|
arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n"); |
|
netif_carrier_on(dev); |
|
} |
|
|
|
if (didsomething) |
|
retval |= IRQ_HANDLED; |
|
} while (--boguscount && didsomething); |
|
|
|
arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n", |
|
lp->hw.status(dev), boguscount); |
|
arc_printk(D_DURING, dev, "\n"); |
|
|
|
lp->hw.intmask(dev, 0); |
|
udelay(1); |
|
lp->hw.intmask(dev, lp->intmask); |
|
|
|
out: |
|
spin_unlock_irqrestore(&lp->lock, flags); |
|
return retval; |
|
} |
|
EXPORT_SYMBOL(arcnet_interrupt); |
|
|
|
/* 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) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
union { |
|
struct archdr pkt; |
|
char buf[512]; |
|
} rxdata; |
|
struct arc_rfc1201 *soft; |
|
int length, ofs; |
|
|
|
soft = &rxdata.pkt.soft.rfc1201; |
|
|
|
lp->hw.copy_from_card(dev, bufnum, 0, &rxdata.pkt, ARC_HDR_SIZE); |
|
if (rxdata.pkt.hard.offset[0]) { |
|
ofs = rxdata.pkt.hard.offset[0]; |
|
length = 256 - ofs; |
|
} else { |
|
ofs = rxdata.pkt.hard.offset[1]; |
|
length = 512 - ofs; |
|
} |
|
|
|
/* get the full header, if possible */ |
|
if (sizeof(rxdata.pkt.soft) <= length) { |
|
lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(rxdata.pkt.soft)); |
|
} else { |
|
memset(&rxdata.pkt.soft, 0, sizeof(rxdata.pkt.soft)); |
|
lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); |
|
} |
|
|
|
arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n", |
|
bufnum, rxdata.pkt.hard.source, rxdata.pkt.hard.dest, length); |
|
|
|
dev->stats.rx_packets++; |
|
dev->stats.rx_bytes += length + ARC_HDR_SIZE; |
|
|
|
/* call the right receiver for the protocol */ |
|
if (arc_proto_map[soft->proto]->is_ip) { |
|
if (BUGLVL(D_PROTO)) { |
|
struct ArcProto |
|
*oldp = arc_proto_map[lp->default_proto[rxdata.pkt.hard.source]], |
|
*newp = arc_proto_map[soft->proto]; |
|
|
|
if (oldp != newp) { |
|
arc_printk(D_PROTO, dev, |
|
"got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n", |
|
soft->proto, rxdata.pkt.hard.source, |
|
newp->suffix, oldp->suffix); |
|
} |
|
} |
|
|
|
/* broadcasts will always be done with the last-used encap. */ |
|
lp->default_proto[0] = soft->proto; |
|
|
|
/* in striking contrast, the following isn't a hack. */ |
|
lp->default_proto[rxdata.pkt.hard.source] = soft->proto; |
|
} |
|
/* call the protocol-specific receiver. */ |
|
arc_proto_map[soft->proto]->rx(dev, bufnum, &rxdata.pkt, length); |
|
} |
|
|
|
static void null_rx(struct net_device *dev, int bufnum, |
|
struct archdr *pkthdr, int length) |
|
{ |
|
arc_printk(D_PROTO, dev, |
|
"rx: don't know how to deal with proto %02Xh from host %02Xh.\n", |
|
pkthdr->soft.rfc1201.proto, pkthdr->hard.source); |
|
} |
|
|
|
static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
|
unsigned short type, uint8_t daddr) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
|
|
arc_printk(D_PROTO, dev, |
|
"tx: can't build header for encap %02Xh; load a protocol driver.\n", |
|
lp->default_proto[daddr]); |
|
|
|
/* always fails */ |
|
return 0; |
|
} |
|
|
|
/* 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) |
|
{ |
|
struct arcnet_local *lp = netdev_priv(dev); |
|
struct arc_hardware newpkt; |
|
|
|
arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n"); |
|
|
|
/* send a packet to myself -- will never get received, of course */ |
|
newpkt.source = newpkt.dest = dev->dev_addr[0]; |
|
|
|
/* only one byte of actual data (and it's random) */ |
|
newpkt.offset[0] = 0xFF; |
|
|
|
lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); |
|
|
|
return 1; /* done */ |
|
}
|
|
|