2 * Linux ARCnet driver - device-independent routines
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
12 * **********************
14 * The original copyright was as follows:
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
22 * **********************
24 * The change log is now in a file called ChangeLog in this directory.
27 * - Crynwr arcnet.com/arcether.com packet drivers.
28 * - arcnet.c v0.00 dated 1/1/94 and apparently by
29 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
44 #define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/delay.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_arp.h>
52 #include <linux/init.h>
53 #include <linux/arcdevice.h>
54 #include <linux/jiffies.h>
56 /* "do nothing" functions for protocol drivers */
57 static void null_rx(struct net_device
*dev
, int bufnum
,
58 struct archdr
*pkthdr
, int length
);
59 static int null_build_header(struct sk_buff
*skb
, struct net_device
*dev
,
60 unsigned short type
, uint8_t daddr
);
61 static int null_prepare_tx(struct net_device
*dev
, struct archdr
*pkt
,
62 int length
, int bufnum
);
64 static void arcnet_rx(struct net_device
*dev
, int bufnum
);
67 * one ArcProto per possible proto ID. None of the elements of
68 * arc_proto_map are allowed to be NULL; they will get set to
69 * arc_proto_default instead. It also must not be NULL; if you would like
70 * to set it to NULL, set it to &arc_proto_null instead.
72 struct ArcProto
*arc_proto_map
[256], *arc_proto_default
,
73 *arc_bcast_proto
, *arc_raw_proto
;
75 static struct ArcProto arc_proto_null
=
81 .build_header
= null_build_header
,
82 .prepare_tx
= null_prepare_tx
,
87 /* Exported function prototypes */
88 int arcnet_debug
= ARCNET_DEBUG
;
90 EXPORT_SYMBOL(arc_proto_map
);
91 EXPORT_SYMBOL(arc_proto_default
);
92 EXPORT_SYMBOL(arc_bcast_proto
);
93 EXPORT_SYMBOL(arc_raw_proto
);
94 EXPORT_SYMBOL(arcnet_unregister_proto
);
95 EXPORT_SYMBOL(arcnet_debug
);
96 EXPORT_SYMBOL(alloc_arcdev
);
97 EXPORT_SYMBOL(arcnet_interrupt
);
98 EXPORT_SYMBOL(arcnet_open
);
99 EXPORT_SYMBOL(arcnet_close
);
100 EXPORT_SYMBOL(arcnet_send_packet
);
101 EXPORT_SYMBOL(arcnet_timeout
);
103 /* Internal function prototypes */
104 static int arcnet_header(struct sk_buff
*skb
, struct net_device
*dev
,
105 unsigned short type
, const void *daddr
,
106 const void *saddr
, unsigned len
);
107 static int arcnet_rebuild_header(struct sk_buff
*skb
);
108 static int go_tx(struct net_device
*dev
);
110 static int debug
= ARCNET_DEBUG
;
111 module_param(debug
, int, 0);
112 MODULE_LICENSE("GPL");
114 static int __init
arcnet_init(void)
118 arcnet_debug
= debug
;
120 printk("arcnet loaded.\n");
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\n"
127 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
128 "arcnet: * me if you have any questions, comments, or bug reports.\n"
133 /* initialize the protocol map */
134 arc_raw_proto
= arc_proto_default
= arc_bcast_proto
= &arc_proto_null
;
135 for (count
= 0; count
< 256; count
++)
136 arc_proto_map
[count
] = arc_proto_default
;
139 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
140 sizeof(struct arc_hardware
), sizeof(struct arc_rfc1201
),
141 sizeof(struct arc_rfc1051
), sizeof(struct arc_eth_encap
),
142 sizeof(struct archdr
));
147 static void __exit
arcnet_exit(void)
151 module_init(arcnet_init
);
152 module_exit(arcnet_exit
);
155 * Dump the contents of an sk_buff
157 #if ARCNET_DEBUG_MAX & D_SKB
158 void arcnet_dump_skb(struct net_device
*dev
,
159 struct sk_buff
*skb
, char *desc
)
163 printk(KERN_DEBUG
"%6s: skb dump (%s) follows:", dev
->name
, desc
);
164 for (i
= 0; i
< skb
->len
; i
++) {
166 printk("\n" KERN_DEBUG
"[%04X] ", i
);
167 printk("%02X ", ((u_char
*) skb
->data
)[i
]);
172 EXPORT_SYMBOL(arcnet_dump_skb
);
177 * Dump the contents of an ARCnet buffer
179 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
180 static void arcnet_dump_packet(struct net_device
*dev
, int bufnum
,
181 char *desc
, int take_arcnet_lock
)
183 struct arcnet_local
*lp
= netdev_priv(dev
);
185 unsigned long flags
= 0;
186 static uint8_t buf
[512];
188 /* hw.copy_from_card expects IRQ context so take the IRQ lock
189 to keep it single threaded */
191 spin_lock_irqsave(&lp
->lock
, flags
);
193 lp
->hw
.copy_from_card(dev
, bufnum
, 0, buf
, 512);
195 spin_unlock_irqrestore(&lp
->lock
, flags
);
197 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
198 length
= (buf
[2] ? 256 : 512);
200 printk(KERN_DEBUG
"%6s: packet dump (%s) follows:", dev
->name
, desc
);
201 for (i
= 0; i
< length
; i
++) {
203 printk("\n" KERN_DEBUG
"[%04X] ", i
);
204 printk("%02X ", buf
[i
]);
212 #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
218 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
219 * are responsible for registering themselves, but the unregister routine
220 * is pretty generic so we'll do it here.
222 void arcnet_unregister_proto(struct ArcProto
*proto
)
226 if (arc_proto_default
== proto
)
227 arc_proto_default
= &arc_proto_null
;
228 if (arc_bcast_proto
== proto
)
229 arc_bcast_proto
= arc_proto_default
;
230 if (arc_raw_proto
== proto
)
231 arc_raw_proto
= arc_proto_default
;
233 for (count
= 0; count
< 256; count
++) {
234 if (arc_proto_map
[count
] == proto
)
235 arc_proto_map
[count
] = arc_proto_default
;
241 * Add a buffer to the queue. Only the interrupt handler is allowed to do
242 * this, unless interrupts are disabled.
244 * Note: we don't check for a full queue, since there aren't enough buffers
245 * to more than fill it.
247 static void release_arcbuf(struct net_device
*dev
, int bufnum
)
249 struct arcnet_local
*lp
= netdev_priv(dev
);
252 lp
->buf_queue
[lp
->first_free_buf
++] = bufnum
;
253 lp
->first_free_buf
%= 5;
256 BUGMSG(D_DURING
, "release_arcbuf: freed #%d; buffer queue is now: ",
258 for (i
= lp
->next_buf
; i
!= lp
->first_free_buf
; i
= (i
+1) % 5)
259 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
260 BUGMSG2(D_DURING
, "\n");
266 * Get a buffer from the queue. If this returns -1, there are no buffers
269 static int get_arcbuf(struct net_device
*dev
)
271 struct arcnet_local
*lp
= netdev_priv(dev
);
274 if (!atomic_dec_and_test(&lp
->buf_lock
)) {
275 /* already in this function */
276 BUGMSG(D_NORMAL
, "get_arcbuf: overlap (%d)!\n",
277 lp
->buf_lock
.counter
);
279 else { /* we can continue */
280 if (lp
->next_buf
>= 5)
283 if (lp
->next_buf
== lp
->first_free_buf
)
284 BUGMSG(D_NORMAL
, "get_arcbuf: BUG: no buffers are available??\n");
286 buf
= lp
->buf_queue
[lp
->next_buf
++];
293 BUGMSG(D_DURING
, "get_arcbuf: got #%d; buffer queue is now: ", buf
);
294 for (i
= lp
->next_buf
; i
!= lp
->first_free_buf
; i
= (i
+1) % 5)
295 BUGMSG2(D_DURING
, "#%d ", lp
->buf_queue
[i
]);
296 BUGMSG2(D_DURING
, "\n");
299 atomic_inc(&lp
->buf_lock
);
304 static int choose_mtu(void)
306 int count
, mtu
= 65535;
308 /* choose the smallest MTU of all available encaps */
309 for (count
= 0; count
< 256; count
++) {
310 if (arc_proto_map
[count
] != &arc_proto_null
311 && arc_proto_map
[count
]->mtu
< mtu
) {
312 mtu
= arc_proto_map
[count
]->mtu
;
316 return mtu
== 65535 ? XMTU
: mtu
;
319 static const struct header_ops arcnet_header_ops
= {
320 .create
= arcnet_header
,
321 .rebuild
= arcnet_rebuild_header
,
324 static const struct net_device_ops arcnet_netdev_ops
= {
325 .ndo_open
= arcnet_open
,
326 .ndo_stop
= arcnet_close
,
327 .ndo_start_xmit
= arcnet_send_packet
,
328 .ndo_tx_timeout
= arcnet_timeout
,
331 /* Setup a struct device for ARCnet. */
332 static void arcdev_setup(struct net_device
*dev
)
334 dev
->type
= ARPHRD_ARCNET
;
335 dev
->netdev_ops
= &arcnet_netdev_ops
;
336 dev
->header_ops
= &arcnet_header_ops
;
337 dev
->hard_header_len
= sizeof(struct archdr
);
338 dev
->mtu
= choose_mtu();
340 dev
->addr_len
= ARCNET_ALEN
;
341 dev
->tx_queue_len
= 100;
342 dev
->broadcast
[0] = 0x00; /* for us, broadcasts are address 0 */
343 dev
->watchdog_timeo
= TX_TIMEOUT
;
345 /* New-style flags. */
346 dev
->flags
= IFF_BROADCAST
;
350 struct net_device
*alloc_arcdev(const char *name
)
352 struct net_device
*dev
;
354 dev
= alloc_netdev(sizeof(struct arcnet_local
),
355 name
&& *name
? name
: "arc%d", arcdev_setup
);
357 struct arcnet_local
*lp
= netdev_priv(dev
);
358 spin_lock_init(&lp
->lock
);
365 * Open/initialize the board. This is called sometime after booting when
366 * the 'ifconfig' program is run.
368 * This routine should set everything up anew at each open, even registers
369 * that "should" only need to be set once at boot, so that there is
370 * non-reboot way to recover if something goes wrong.
372 int arcnet_open(struct net_device
*dev
)
374 struct arcnet_local
*lp
= netdev_priv(dev
);
375 int count
, newmtu
, error
;
377 BUGMSG(D_INIT
,"opened.");
379 if (!try_module_get(lp
->hw
.owner
))
383 BUGMSG(D_PROTO
, "protocol map (default is '%c'): ",
384 arc_proto_default
->suffix
);
385 for (count
= 0; count
< 256; count
++)
386 BUGMSG2(D_PROTO
, "%c", arc_proto_map
[count
]->suffix
);
387 BUGMSG2(D_PROTO
, "\n");
391 BUGMSG(D_INIT
, "arcnet_open: resetting card.\n");
393 /* try to put the card in a defined state - if it fails the first
394 * time, actually reset it.
397 if (ARCRESET(0) && ARCRESET(1))
400 newmtu
= choose_mtu();
401 if (newmtu
< dev
->mtu
)
404 BUGMSG(D_INIT
, "arcnet_open: mtu: %d.\n", dev
->mtu
);
406 /* autodetect the encapsulation for each host. */
407 memset(lp
->default_proto
, 0, sizeof(lp
->default_proto
));
409 /* the broadcast address is special - use the 'bcast' protocol */
410 for (count
= 0; count
< 256; count
++) {
411 if (arc_proto_map
[count
] == arc_bcast_proto
) {
412 lp
->default_proto
[0] = count
;
417 /* initialize buffers */
418 atomic_set(&lp
->buf_lock
, 1);
420 lp
->next_buf
= lp
->first_free_buf
= 0;
421 release_arcbuf(dev
, 0);
422 release_arcbuf(dev
, 1);
423 release_arcbuf(dev
, 2);
424 release_arcbuf(dev
, 3);
425 lp
->cur_tx
= lp
->next_tx
= -1;
428 lp
->rfc1201
.sequence
= 1;
430 /* bring up the hardware driver */
434 if (dev
->dev_addr
[0] == 0)
435 BUGMSG(D_NORMAL
, "WARNING! Station address 00 is reserved "
436 "for broadcasts!\n");
437 else if (dev
->dev_addr
[0] == 255)
438 BUGMSG(D_NORMAL
, "WARNING! Station address FF may confuse "
439 "DOS networking programs!\n");
441 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
442 if (ASTATUS() & RESETflag
) {
443 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
444 ACOMMAND(CFLAGScmd
| RESETclear
);
448 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
449 /* make sure we're ready to receive IRQ's. */
451 udelay(1); /* give it time to set the mask before
452 * we reset it again. (may not even be
455 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
456 lp
->intmask
= NORXflag
| RECONflag
;
457 AINTMASK(lp
->intmask
);
458 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
460 netif_start_queue(dev
);
465 module_put(lp
->hw
.owner
);
470 /* The inverse routine to arcnet_open - shuts down the card. */
471 int arcnet_close(struct net_device
*dev
)
473 struct arcnet_local
*lp
= netdev_priv(dev
);
475 netif_stop_queue(dev
);
477 /* flush TX and disable RX */
479 ACOMMAND(NOTXcmd
); /* stop transmit */
480 ACOMMAND(NORXcmd
); /* disable receive */
483 /* shut down the card */
485 module_put(lp
->hw
.owner
);
490 static int arcnet_header(struct sk_buff
*skb
, struct net_device
*dev
,
491 unsigned short type
, const void *daddr
,
492 const void *saddr
, unsigned len
)
494 const struct arcnet_local
*lp
= netdev_priv(dev
);
495 uint8_t _daddr
, proto_num
;
496 struct ArcProto
*proto
;
499 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
500 saddr
? *(uint8_t *) saddr
: -1,
501 daddr
? *(uint8_t *) daddr
: -1,
504 if (skb
->len
!=0 && len
!= skb
->len
)
505 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
509 /* Type is host order - ? */
510 if(type
== ETH_P_ARCNET
) {
511 proto
= arc_raw_proto
;
512 BUGMSG(D_DEBUG
, "arc_raw_proto used. proto='%c'\n",proto
->suffix
);
513 _daddr
= daddr
? *(uint8_t *) daddr
: 0;
517 * if the dest addr isn't provided, we can't choose an encapsulation!
518 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
519 * real header when we do rebuild_header.
521 *(uint16_t *) skb_push(skb
, 2) = type
;
523 * XXX: Why not use skb->mac_len?
525 if (skb
->network_header
- skb
->mac_header
!= 2)
526 BUGMSG(D_NORMAL
, "arcnet_header: Yikes! diff (%d) is not 2!\n",
527 (int)(skb
->network_header
- skb
->mac_header
));
528 return -2; /* return error -- can't transmit yet! */
531 /* otherwise, we can just add the header as usual. */
532 _daddr
= *(uint8_t *) daddr
;
533 proto_num
= lp
->default_proto
[_daddr
];
534 proto
= arc_proto_map
[proto_num
];
535 BUGMSG(D_DURING
, "building header for %02Xh using protocol '%c'\n",
536 proto_num
, proto
->suffix
);
537 if (proto
== &arc_proto_null
&& arc_bcast_proto
!= proto
) {
538 BUGMSG(D_DURING
, "actually, let's use '%c' instead.\n",
539 arc_bcast_proto
->suffix
);
540 proto
= arc_bcast_proto
;
543 return proto
->build_header(skb
, dev
, type
, _daddr
);
548 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
549 * future other address resolution) has completed on this sk_buff. We now
550 * let ARP fill in the destination field.
552 static int arcnet_rebuild_header(struct sk_buff
*skb
)
554 struct net_device
*dev
= skb
->dev
;
555 struct arcnet_local
*lp
= netdev_priv(dev
);
556 int status
= 0; /* default is failure */
559 struct ArcProto
*proto
;
561 * XXX: Why not use skb->mac_len?
563 if (skb
->network_header
- skb
->mac_header
!= 2) {
565 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
566 (int)(skb
->network_header
- skb
->mac_header
));
569 type
= *(uint16_t *) skb_pull(skb
, 2);
570 BUGMSG(D_DURING
, "rebuild header for protocol %Xh\n", type
);
572 if (type
== ETH_P_IP
) {
574 BUGMSG(D_DURING
, "rebuild header for ethernet protocol %Xh\n", type
);
575 status
= arp_find(&daddr
, skb
) ? 1 : 0;
576 BUGMSG(D_DURING
, " rebuilt: dest is %d; protocol %Xh\n",
581 "I don't understand ethernet protocol %Xh addresses!\n", type
);
582 dev
->stats
.tx_errors
++;
583 dev
->stats
.tx_aborted_errors
++;
586 /* if we couldn't resolve the address... give up. */
590 /* add the _real_ header this time! */
591 proto
= arc_proto_map
[lp
->default_proto
[daddr
]];
592 proto
->build_header(skb
, dev
, type
, daddr
);
594 return 1; /* success */
599 /* Called by the kernel in order to transmit a packet. */
600 int arcnet_send_packet(struct sk_buff
*skb
, struct net_device
*dev
)
602 struct arcnet_local
*lp
= netdev_priv(dev
);
604 struct arc_rfc1201
*soft
;
605 struct ArcProto
*proto
;
611 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
612 ASTATUS(), lp
->cur_tx
, lp
->next_tx
, skb
->len
,skb
->protocol
);
614 pkt
= (struct archdr
*) skb
->data
;
615 soft
= &pkt
->soft
.rfc1201
;
616 proto
= arc_proto_map
[soft
->proto
];
618 BUGMSG(D_SKB_SIZE
, "skb: transmitting %d bytes to %02X\n",
619 skb
->len
, pkt
->hard
.dest
);
620 BUGLVL(D_SKB
) arcnet_dump_skb(dev
, skb
, "tx");
622 /* fits in one packet? */
623 if (skb
->len
- ARC_HDR_SIZE
> XMTU
&& !proto
->continue_tx
) {
624 BUGMSG(D_NORMAL
, "fixme: packet too large: compensating badly!\n");
626 return NETDEV_TX_OK
; /* don't try again */
629 /* We're busy transmitting a packet... */
630 netif_stop_queue(dev
);
632 spin_lock_irqsave(&lp
->lock
, flags
);
634 if(lp
->next_tx
== -1)
635 txbuf
= get_arcbuf(dev
);
640 if (proto
->prepare_tx(dev
, pkt
, skb
->len
, txbuf
) &&
642 /* done right away and we don't want to acknowledge
643 the package later - forget about it now */
644 dev
->stats
.tx_bytes
+= skb
->len
;
647 /* do it the 'split' way */
648 lp
->outgoing
.proto
= proto
;
649 lp
->outgoing
.skb
= skb
;
650 lp
->outgoing
.pkt
= pkt
;
654 if (proto
->continue_tx
&&
655 proto
->continue_tx(dev
, txbuf
)) {
657 "bug! continue_tx finished the first time! "
658 "(proto='%c')\n", proto
->suffix
);
661 retval
= NETDEV_TX_OK
;
662 dev
->trans_start
= jiffies
;
665 retval
= NETDEV_TX_BUSY
;
669 BUGMSG(D_DEBUG
, "%s: %d: %s, status: %x\n",__FILE__
,__LINE__
,__func__
,ASTATUS());
670 /* make sure we didn't ignore a TX IRQ while we were in here */
673 BUGMSG(D_DEBUG
, "%s: %d: %s\n",__FILE__
,__LINE__
,__func__
);
674 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
675 AINTMASK(lp
->intmask
);
676 BUGMSG(D_DEBUG
, "%s: %d: %s, status: %x\n",__FILE__
,__LINE__
,__func__
,ASTATUS());
678 spin_unlock_irqrestore(&lp
->lock
, flags
);
682 return retval
; /* no need to try again */
687 * Actually start transmitting a packet that was loaded into a buffer
688 * by prepare_tx. This should _only_ be called by the interrupt handler.
690 static int go_tx(struct net_device
*dev
)
692 struct arcnet_local
*lp
= netdev_priv(dev
);
694 BUGMSG(D_DURING
, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
695 ASTATUS(), lp
->intmask
, lp
->next_tx
, lp
->cur_tx
);
697 if (lp
->cur_tx
!= -1 || lp
->next_tx
== -1)
700 BUGLVL(D_TX
) arcnet_dump_packet(dev
, lp
->next_tx
, "go_tx", 0);
702 lp
->cur_tx
= lp
->next_tx
;
706 ACOMMAND(TXcmd
| (lp
->cur_tx
<< 3));
708 dev
->stats
.tx_packets
++;
709 lp
->lasttrans_dest
= lp
->lastload_dest
;
710 lp
->lastload_dest
= 0;
711 lp
->excnak_pending
= 0;
712 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
718 /* Called by the kernel when transmit times out */
719 void arcnet_timeout(struct net_device
*dev
)
722 struct arcnet_local
*lp
= netdev_priv(dev
);
723 int status
= ASTATUS();
726 spin_lock_irqsave(&lp
->lock
, flags
);
727 if (status
& TXFREEflag
) { /* transmit _DID_ finish */
728 msg
= " - missed IRQ?";
731 dev
->stats
.tx_aborted_errors
++;
733 ACOMMAND(NOTXcmd
| (lp
->cur_tx
<< 3));
735 dev
->stats
.tx_errors
++;
737 /* make sure we didn't miss a TX or a EXC NAK IRQ */
739 lp
->intmask
|= TXFREEflag
|EXCNAKflag
;
740 AINTMASK(lp
->intmask
);
742 spin_unlock_irqrestore(&lp
->lock
, flags
);
744 if (time_after(jiffies
, lp
->last_timeout
+ 10*HZ
)) {
745 BUGMSG(D_EXTRA
, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
746 msg
, status
, lp
->intmask
, lp
->lasttrans_dest
);
747 lp
->last_timeout
= jiffies
;
750 if (lp
->cur_tx
== -1)
751 netif_wake_queue(dev
);
756 * The typical workload of the driver: Handle the network interface
757 * interrupts. Establish which device needs attention, and call the correct
758 * chipset interrupt handler.
760 irqreturn_t
arcnet_interrupt(int irq
, void *dev_id
)
762 struct net_device
*dev
= dev_id
;
763 struct arcnet_local
*lp
;
764 int recbuf
, status
, diagstatus
, didsomething
, boguscount
;
765 int retval
= IRQ_NONE
;
767 BUGMSG(D_DURING
, "\n");
769 BUGMSG(D_DURING
, "in arcnet_interrupt\n");
771 lp
= netdev_priv(dev
);
774 spin_lock(&lp
->lock
);
777 * RESET flag was enabled - if device is not running, we must clear it right
778 * away (but nothing else).
780 if (!netif_running(dev
)) {
781 if (ASTATUS() & RESETflag
)
782 ACOMMAND(CFLAGScmd
| RESETclear
);
784 spin_unlock(&lp
->lock
);
788 BUGMSG(D_DURING
, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
789 ASTATUS(), lp
->intmask
);
794 diagstatus
= (status
>> 8) & 0xFF;
796 BUGMSG(D_DEBUG
, "%s: %d: %s: status=%x\n",
797 __FILE__
,__LINE__
,__func__
,status
);
801 * RESET flag was enabled - card is resetting and if RX is
802 * disabled, it's NOT because we just got a packet.
804 * The card is in an undefined state. Clear it out and start over.
806 if (status
& RESETflag
) {
807 BUGMSG(D_NORMAL
, "spurious reset (status=%Xh)\n", status
);
811 /* get out of the interrupt handler! */
815 * RX is inhibited - we must have received something. Prepare to
816 * receive into the next buffer.
818 * We don't actually copy the received packet from the card until
819 * after the transmit handler runs (and possibly launches the next
820 * tx); this should improve latency slightly if we get both types
821 * of interrupts at once.
824 if (status
& lp
->intmask
& NORXflag
) {
826 BUGMSG(D_DURING
, "Buffer #%d: receive irq (status=%Xh)\n",
829 lp
->cur_rx
= get_arcbuf(dev
);
830 if (lp
->cur_rx
!= -1) {
831 BUGMSG(D_DURING
, "enabling receive to buffer #%d\n",
833 ACOMMAND(RXcmd
| (lp
->cur_rx
<< 3) | RXbcasts
);
838 if((diagstatus
& EXCNAKflag
)) {
839 BUGMSG(D_DURING
, "EXCNAK IRQ (diagstat=%Xh)\n",
842 ACOMMAND(NOTXcmd
); /* disable transmit */
843 lp
->excnak_pending
= 1;
845 ACOMMAND(EXCNAKclear
);
846 lp
->intmask
&= ~(EXCNAKflag
);
851 /* a transmit finished, and we're interested in it. */
852 if ((status
& lp
->intmask
& TXFREEflag
) || lp
->timed_out
) {
853 lp
->intmask
&= ~(TXFREEflag
|EXCNAKflag
);
855 BUGMSG(D_DURING
, "TX IRQ (stat=%Xh)\n", status
);
857 if (lp
->cur_tx
!= -1 && !lp
->timed_out
) {
858 if(!(status
& TXACKflag
)) {
859 if (lp
->lasttrans_dest
!= 0) {
861 "transmit was not acknowledged! "
862 "(status=%Xh, dest=%02Xh)\n",
863 status
, lp
->lasttrans_dest
);
864 dev
->stats
.tx_errors
++;
865 dev
->stats
.tx_carrier_errors
++;
868 "broadcast was not acknowledged; that's normal "
869 "(status=%Xh, dest=%02Xh)\n",
870 status
, lp
->lasttrans_dest
);
874 if (lp
->outgoing
.proto
&&
875 lp
->outgoing
.proto
->ack_tx
) {
877 if(status
& TXACKflag
)
879 else if(lp
->excnak_pending
)
885 ->ack_tx(dev
, ackstatus
);
888 if (lp
->cur_tx
!= -1)
889 release_arcbuf(dev
, lp
->cur_tx
);
895 /* send another packet if there is one */
898 /* continue a split packet, if any */
899 if (lp
->outgoing
.proto
&& lp
->outgoing
.proto
->continue_tx
) {
900 int txbuf
= get_arcbuf(dev
);
902 if (lp
->outgoing
.proto
->continue_tx(dev
, txbuf
)) {
903 /* that was the last segment */
904 dev
->stats
.tx_bytes
+= lp
->outgoing
.skb
->len
;
905 if(!lp
->outgoing
.proto
->ack_tx
)
907 dev_kfree_skb_irq(lp
->outgoing
.skb
);
908 lp
->outgoing
.proto
= NULL
;
914 /* inform upper layers of idleness, if necessary */
915 if (lp
->cur_tx
== -1)
916 netif_wake_queue(dev
);
918 /* now process the received packet, if any */
920 BUGLVL(D_RX
) arcnet_dump_packet(dev
, recbuf
, "rx irq", 0);
922 arcnet_rx(dev
, recbuf
);
923 release_arcbuf(dev
, recbuf
);
927 if (status
& lp
->intmask
& RECONflag
) {
928 ACOMMAND(CFLAGScmd
| CONFIGclear
);
929 dev
->stats
.tx_carrier_errors
++;
931 BUGMSG(D_RECON
, "Network reconfiguration detected (status=%Xh)\n",
933 /* MYRECON bit is at bit 7 of diagstatus */
934 if(diagstatus
& 0x80)
935 BUGMSG(D_RECON
,"Put out that recon myself\n");
937 /* is the RECON info empty or old? */
938 if (!lp
->first_recon
|| !lp
->last_recon
||
939 time_after(jiffies
, lp
->last_recon
+ HZ
* 10)) {
940 if (lp
->network_down
)
941 BUGMSG(D_NORMAL
, "reconfiguration detected: cabling restored?\n");
942 lp
->first_recon
= lp
->last_recon
= jiffies
;
943 lp
->num_recons
= lp
->network_down
= 0;
945 BUGMSG(D_DURING
, "recon: clearing counters.\n");
946 } else { /* add to current RECON counter */
947 lp
->last_recon
= jiffies
;
950 BUGMSG(D_DURING
, "recon: counter=%d, time=%lds, net=%d\n",
952 (lp
->last_recon
- lp
->first_recon
) / HZ
,
955 /* if network is marked up;
956 * and first_recon and last_recon are 60+ apart;
957 * and the average no. of recons counted is
958 * > RECON_THRESHOLD/min;
959 * then print a warning message.
961 if (!lp
->network_down
962 && (lp
->last_recon
- lp
->first_recon
) <= HZ
* 60
963 && lp
->num_recons
>= RECON_THRESHOLD
) {
964 lp
->network_down
= 1;
965 BUGMSG(D_NORMAL
, "many reconfigurations detected: cabling problem?\n");
966 } else if (!lp
->network_down
967 && lp
->last_recon
- lp
->first_recon
> HZ
* 60) {
968 /* reset counters if we've gone for over a minute. */
969 lp
->first_recon
= lp
->last_recon
;
973 } else if (lp
->network_down
&&
974 time_after(jiffies
, lp
->last_recon
+ HZ
* 10)) {
975 if (lp
->network_down
)
976 BUGMSG(D_NORMAL
, "cabling restored?\n");
977 lp
->first_recon
= lp
->last_recon
= 0;
978 lp
->num_recons
= lp
->network_down
= 0;
980 BUGMSG(D_DURING
, "not recon: clearing counters anyway.\n");
984 retval
|= IRQ_HANDLED
;
987 while (--boguscount
&& didsomething
);
989 BUGMSG(D_DURING
, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
990 ASTATUS(), boguscount
);
991 BUGMSG(D_DURING
, "\n");
996 AINTMASK(lp
->intmask
);
998 spin_unlock(&lp
->lock
);
1004 * This is a generic packet receiver that calls arcnet??_rx depending on the
1005 * protocol ID found.
1007 static void arcnet_rx(struct net_device
*dev
, int bufnum
)
1009 struct arcnet_local
*lp
= netdev_priv(dev
);
1011 struct arc_rfc1201
*soft
;
1014 soft
= &pkt
.soft
.rfc1201
;
1016 lp
->hw
.copy_from_card(dev
, bufnum
, 0, &pkt
, sizeof(ARC_HDR_SIZE
));
1017 if (pkt
.hard
.offset
[0]) {
1018 ofs
= pkt
.hard
.offset
[0];
1021 ofs
= pkt
.hard
.offset
[1];
1025 /* get the full header, if possible */
1026 if (sizeof(pkt
.soft
) <= length
)
1027 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, sizeof(pkt
.soft
));
1029 memset(&pkt
.soft
, 0, sizeof(pkt
.soft
));
1030 lp
->hw
.copy_from_card(dev
, bufnum
, ofs
, soft
, length
);
1033 BUGMSG(D_DURING
, "Buffer #%d: received packet from %02Xh to %02Xh "
1035 bufnum
, pkt
.hard
.source
, pkt
.hard
.dest
, length
);
1037 dev
->stats
.rx_packets
++;
1038 dev
->stats
.rx_bytes
+= length
+ ARC_HDR_SIZE
;
1040 /* call the right receiver for the protocol */
1041 if (arc_proto_map
[soft
->proto
]->is_ip
) {
1044 *oldp
= arc_proto_map
[lp
->default_proto
[pkt
.hard
.source
]],
1045 *newp
= arc_proto_map
[soft
->proto
];
1049 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1050 " (was '%c')\n", soft
->proto
, pkt
.hard
.source
,
1051 newp
->suffix
, oldp
->suffix
);
1055 /* broadcasts will always be done with the last-used encap. */
1056 lp
->default_proto
[0] = soft
->proto
;
1058 /* in striking contrast, the following isn't a hack. */
1059 lp
->default_proto
[pkt
.hard
.source
] = soft
->proto
;
1061 /* call the protocol-specific receiver. */
1062 arc_proto_map
[soft
->proto
]->rx(dev
, bufnum
, &pkt
, length
);
1066 static void null_rx(struct net_device
*dev
, int bufnum
,
1067 struct archdr
*pkthdr
, int length
)
1070 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1071 pkthdr
->soft
.rfc1201
.proto
, pkthdr
->hard
.source
);
1075 static int null_build_header(struct sk_buff
*skb
, struct net_device
*dev
,
1076 unsigned short type
, uint8_t daddr
)
1078 struct arcnet_local
*lp
= netdev_priv(dev
);
1081 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1082 lp
->default_proto
[daddr
]);
1089 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1090 static int null_prepare_tx(struct net_device
*dev
, struct archdr
*pkt
,
1091 int length
, int bufnum
)
1093 struct arcnet_local
*lp
= netdev_priv(dev
);
1094 struct arc_hardware newpkt
;
1096 BUGMSG(D_PROTO
, "tx: no encap for this host; load a protocol driver.\n");
1098 /* send a packet to myself -- will never get received, of course */
1099 newpkt
.source
= newpkt
.dest
= dev
->dev_addr
[0];
1101 /* only one byte of actual data (and it's random) */
1102 newpkt
.offset
[0] = 0xFF;
1104 lp
->hw
.copy_to_card(dev
, bufnum
, 0, &newpkt
, ARC_HDR_SIZE
);
1106 return 1; /* done */