firestream.c 54 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

/* drivers/atm/firestream.c - FireStream 155 (MB86697) and
 *                            FireStream  50 (MB86695) device driver 
 */
 
/* Written & (C) 2000 by R.E.Wolff@BitWizard.nl 
 * Copied snippets from zatm.c by Werner Almesberger, EPFL LRC/ICA 
 * and ambassador.c Copyright (C) 1995-1999  Madge Networks Ltd 
 */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  The GNU GPL is contained in /usr/doc/copyright/GPL on a Debian
  system and in the file COPYING in the Linux kernel source.
*/


#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
36
#include <linux/poison.h>
Linus Torvalds's avatar
Linus Torvalds committed
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
#include <linux/errno.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/ioport.h> /* for request_region */
#include <linux/uio.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/string.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <linux/wait.h>

#include "firestream.h"

static int loopback = 0;
static int num=0x5a;

/* According to measurements (but they look suspicious to me!) done in
 * '97, 37% of the packets are one cell in size. So it pays to have
 * buffers allocated at that size. A large jump in percentage of
 * packets occurs at packets around 536 bytes in length. So it also
 * pays to have those pre-allocated. Unfortunately, we can't fully
 * take advantage of this as the majority of the packets is likely to
 * be TCP/IP (As where obviously the measurement comes from) There the
 * link would be opened with say a 1500 byte MTU, and we can't handle
 * smaller buffers more efficiently than the larger ones. -- REW
 */

/* Due to the way Linux memory management works, specifying "576" as
 * an allocation size here isn't going to help. They are allocated
 * from 1024-byte regions anyway. With the size of the sk_buffs (quite
 * large), it doesn't pay to allocate the smallest size (64) -- REW */

/* This is all guesswork. Hard numbers to back this up or disprove this, 
 * are appreciated. -- REW */

/* The last entry should be about 64k. However, the "buffer size" is
 * passed to the chip in a 16 bit field. I don't know how "65536"
 * would be interpreted. -- REW */

#define NP FS_NR_FREE_POOLS
static int rx_buf_sizes[NP]  = {128,  256,  512, 1024, 2048, 4096, 16384, 65520};
/* log2:                 7     8     9    10    11    12    14     16 */

#if 0
static int rx_pool_sizes[NP] = {1024, 1024, 512, 256,  128,  64,   32,    32};
#else
/* debug */
static int rx_pool_sizes[NP] = {128,  128,  128, 64,   64,   64,   32,    32};
#endif
/* log2:                 10    10    9    8     7     6     5      5  */
/* sumlog2:              17    18    18   18    18    18    19     21 */
/* mem allocated:        128k  256k  256k 256k  256k  256k  512k   2M */
/* tot mem: almost 4M */

/* NP is shorter, so that it fits on a single line. */
#undef NP


/* Small hardware gotcha:

   The FS50 CAM (VP/VC match registers) always take the lowest channel
   number that matches. This is not a problem.

   However, they also ignore whether the channel is enabled or
   not. This means that if you allocate channel 0 to 1.2 and then
   channel 1 to 0.0, then disabeling channel 0 and writing 0 to the
   match channel for channel 0 will "steal" the traffic from channel
   1, even if you correctly disable channel 0.

   Workaround: 

   - When disabling channels, write an invalid VP/VC value to the
   match register. (We use 0xffffffff, which in the worst case 
   matches VP/VC = <maxVP>/<maxVC>, but I expect it not to match
   anything as some "when not in use, program to 0" bits are now
   programmed to 1...)

   - Don't initialize the match registers to 0, as 0.0 is a valid
   channel.
*/


/* Optimization hints and tips.

   The FireStream chips are very capable of reducing the amount of
   "interrupt-traffic" for the CPU. This driver requests an interrupt on EVERY
   action. You could try to minimize this a bit. 

   Besides that, the userspace->kernel copy and the PCI bus are the
   performance limiting issues for this driver.

   You could queue up a bunch of outgoing packets without telling the
   FireStream. I'm not sure that's going to win you much though. The
   Linux layer won't tell us in advance when it's not going to give us
   any more packets in a while. So this is tricky to implement right without
   introducing extra delays. 
  
   -- REW
 */




/* The strings that define what the RX queue entry is all about. */
/* Fujitsu: Please tell me which ones can have a pointer to a 
   freepool descriptor! */
static char *res_strings[] = {
	"RX OK: streaming not EOP", 
	"RX OK: streaming EOP", 
	"RX OK: Single buffer packet", 
	"RX OK: packet mode", 
	"RX OK: F4 OAM (end to end)", 
	"RX OK: F4 OAM (Segment)", 
	"RX OK: F5 OAM (end to end)", 
	"RX OK: F5 OAM (Segment)", 
	"RX OK: RM cell", 
	"RX OK: TRANSP cell", 
	"RX OK: TRANSPC cell", 
	"Unmatched cell", 
	"reserved 12", 
	"reserved 13", 
	"reserved 14", 
	"Unrecognized cell", 
	"reserved 16", 
	"reassemby abort: AAL5 abort", 
	"packet purged", 
	"packet ageing timeout", 
	"channel ageing timeout", 
	"calculated lenght error", 
	"programmed lenght limit error", 
	"aal5 crc32 error", 
	"oam transp or transpc crc10 error", 
	"reserved 25", 
	"reserved 26", 
	"reserved 27", 
	"reserved 28", 
	"reserved 29", 
	"reserved 30", 
	"reassembly abort: no buffers", 
	"receive buffer overflow", 
	"change in GFC", 
	"receive buffer full", 
	"low priority discard - no receive descriptor", 
	"low priority discard - missing end of packet", 
	"reserved 41", 
	"reserved 42", 
	"reserved 43", 
	"reserved 44", 
	"reserved 45", 
	"reserved 46", 
	"reserved 47", 
	"reserved 48", 
	"reserved 49", 
	"reserved 50", 
	"reserved 51", 
	"reserved 52", 
	"reserved 53", 
	"reserved 54", 
	"reserved 55", 
	"reserved 56", 
	"reserved 57", 
	"reserved 58", 
	"reserved 59", 
	"reserved 60", 
	"reserved 61", 
	"reserved 62", 
	"reserved 63", 
};  

static char *irq_bitname[] = {
	"LPCO",
	"DPCO",
	"RBRQ0_W",
	"RBRQ1_W",
	"RBRQ2_W",
	"RBRQ3_W",
	"RBRQ0_NF",
	"RBRQ1_NF",
	"RBRQ2_NF",
	"RBRQ3_NF",
	"BFP_SC",
	"INIT",
	"INIT_ERR",
	"USCEO",
	"UPEC0",
	"VPFCO",
	"CRCCO",
	"HECO",
	"TBRQ_W",
	"TBRQ_NF",
	"CTPQ_E",
	"GFC_C0",
	"PCI_FTL",
	"CSQ_W",
	"CSQ_NF",
	"EXT_INT",
	"RXDMA_S"
};


#define PHY_EOF -1
#define PHY_CLEARALL -2

struct reginit_item {
	int reg, val;
};


static struct reginit_item PHY_NTC_INIT[] __devinitdata = {
	{ PHY_CLEARALL, 0x40 }, 
	{ 0x12,  0x0001 },
	{ 0x13,  0x7605 },
	{ 0x1A,  0x0001 },
	{ 0x1B,  0x0005 },
	{ 0x38,  0x0003 },
	{ 0x39,  0x0006 },   /* changed here to make loopback */
	{ 0x01,  0x5262 },
	{ 0x15,  0x0213 },
	{ 0x00,  0x0003 },
	{ PHY_EOF, 0},    /* -1 signals end of list */
};


/* Safetyfeature: If the card interrupts more than this number of times
   in a jiffy (1/100th of a second) then we just disable the interrupt and
   print a message. This prevents the system from hanging. 

   150000 packets per second is close to the limit a PC is going to have
   anyway. We therefore have to disable this for production. -- REW */
#undef IRQ_RATE_LIMIT // 100

/* Interrupts work now. Unlike serial cards, ATM cards don't work all
   that great without interrupts. -- REW */
#undef FS_POLL_FREQ // 100

/* 
   This driver can spew a whole lot of debugging output at you. If you
   need maximum performance, you should disable the DEBUG define. To
   aid in debugging in the field, I'm leaving the compile-time debug
   features enabled, and disable them "runtime". That allows me to
   instruct people with problems to enable debugging without requiring
   them to recompile... -- REW
*/
#define DEBUG

#ifdef DEBUG
#define fs_dprintk(f, str...) if (fs_debug & f) printk (str)
#else
#define fs_dprintk(f, str...) /* nothing */
#endif


static int fs_keystream = 0;

#ifdef DEBUG
/* I didn't forget to set this to zero before shipping. Hit me with a stick 
   if you get this with the debug default not set to zero again. -- REW */
static int fs_debug = 0;
#else
#define fs_debug 0
#endif

#ifdef MODULE
#ifdef DEBUG 
module_param(fs_debug, int, 0644);
#endif
module_param(loopback, int, 0);
module_param(num, int, 0);
module_param(fs_keystream, int, 0);
/* XXX Add rx_buf_sizes, and rx_pool_sizes As per request Amar. -- REW */
#endif


#define FS_DEBUG_FLOW    0x00000001
#define FS_DEBUG_OPEN    0x00000002
#define FS_DEBUG_QUEUE   0x00000004
#define FS_DEBUG_IRQ     0x00000008
#define FS_DEBUG_INIT    0x00000010
#define FS_DEBUG_SEND    0x00000020
#define FS_DEBUG_PHY     0x00000040
#define FS_DEBUG_CLEANUP 0x00000080
#define FS_DEBUG_QOS     0x00000100
#define FS_DEBUG_TXQ     0x00000200
#define FS_DEBUG_ALLOC   0x00000400
#define FS_DEBUG_TXMEM   0x00000800
#define FS_DEBUG_QSIZE   0x00001000


#define func_enter() fs_dprintk (FS_DEBUG_FLOW, "fs: enter %s\n", __FUNCTION__)
#define func_exit()  fs_dprintk (FS_DEBUG_FLOW, "fs: exit  %s\n", __FUNCTION__)


static struct fs_dev *fs_boards = NULL;

#ifdef DEBUG

static void my_hd (void *addr, int len)
{
	int j, ch;
	unsigned char *ptr = addr;

	while (len > 0) {
		printk ("%p ", ptr);
		for (j=0;j < ((len < 16)?len:16);j++) {
			printk ("%02x %s", ptr[j], (j==7)?" ":"");
		}
		for (  ;j < 16;j++) {
			printk ("   %s", (j==7)?" ":"");
		}
		for (j=0;j < ((len < 16)?len:16);j++) {
			ch = ptr[j];
			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
		}
		printk ("\n");
		ptr += 16;
		len -= 16;
	}
}
#else /* DEBUG */
static void my_hd (void *addr, int len){}
#endif /* DEBUG */

/********** free an skb (as per ATM device driver documentation) **********/

/* Hmm. If this is ATM specific, why isn't there an ATM routine for this?
 * I copied it over from the ambassador driver. -- REW */

static inline void fs_kfree_skb (struct sk_buff * skb) 
{
	if (ATM_SKB(skb)->vcc->pop)
		ATM_SKB(skb)->vcc->pop (ATM_SKB(skb)->vcc, skb);
	else
		dev_kfree_skb_any (skb);
}




/* It seems the ATM forum recommends this horribly complicated 16bit
 * floating point format. Turns out the Ambassador uses the exact same
 * encoding. I just copied it over. If Mitch agrees, I'll move it over
 * to the atm_misc file or something like that. (and remove it from 
 * here and the ambassador driver) -- REW
 */

/* The good thing about this format is that it is monotonic. So, 
   a conversion routine need not be very complicated. To be able to
   round "nearest" we need to take along a few extra bits. Lets
   put these after 16 bits, so that we can just return the top 16
   bits of the 32bit number as the result:

   int mr (unsigned int rate, int r) 
     {
     int e = 16+9;
     static int round[4]={0, 0, 0xffff, 0x8000};
     if (!rate) return 0;
     while (rate & 0xfc000000) {
       rate >>= 1;
       e++;
     }
     while (! (rate & 0xfe000000)) {
       rate <<= 1;
       e--;
     }

// Now the mantissa is in positions bit 16-25. Excepf for the "hidden 1" that's in bit 26.
     rate &= ~0x02000000;
// Next add in the exponent
     rate |= e << (16+9);
// And perform the rounding:
     return (rate + round[r]) >> 16;
   }

   14 lines-of-code. Compare that with the 120 that the Ambassador
   guys needed. (would be 8 lines shorter if I'd try to really reduce
   the number of lines:

   int mr (unsigned int rate, int r) 
   {
     int e = 16+9;
     static int round[4]={0, 0, 0xffff, 0x8000};
     if (!rate) return 0;
     for (;  rate & 0xfc000000 ;rate >>= 1, e++);
     for (;!(rate & 0xfe000000);rate <<= 1, e--);
     return ((rate & ~0x02000000) | (e << (16+9)) + round[r]) >> 16;
   }

   Exercise for the reader: Remove one more line-of-code, without
   cheating. (Just joining two lines is cheating). (I know it's
   possible, don't think you've beat me if you found it... If you
   manage to lose two lines or more, keep me updated! ;-)

   -- REW */


#define ROUND_UP      1
#define ROUND_DOWN    2
#define ROUND_NEAREST 3
/********** make rate (not quite as much fun as Horizon) **********/

static unsigned int make_rate (unsigned int rate, int r,
			       u16 * bits, unsigned int * actual) 
{
	unsigned char exp = -1; /* hush gcc */
	unsigned int man = -1;  /* hush gcc */
  
	fs_dprintk (FS_DEBUG_QOS, "make_rate %u", rate);
  
	/* rates in cells per second, ITU format (nasty 16-bit floating-point)
	   given 5-bit e and 9-bit m:
	   rate = EITHER (1+m/2^9)*2^e    OR 0
	   bits = EITHER 1<<14 | e<<9 | m OR 0
	   (bit 15 is "reserved", bit 14 "non-zero")
	   smallest rate is 0 (special representation)
	   largest rate is (1+511/512)*2^31 = 4290772992 (< 2^32-1)
	   smallest non-zero rate is (1+0/512)*2^0 = 1 (> 0)
	   simple algorithm:
	   find position of top bit, this gives e
	   remove top bit and shift (rounding if feeling clever) by 9-e
	*/
	/* Ambassador ucode bug: please don't set bit 14! so 0 rate not
	   representable. // This should move into the ambassador driver
	   when properly merged. -- REW */
  
	if (rate > 0xffc00000U) {
		/* larger than largest representable rate */
    
		if (r == ROUND_UP) {
			return -EINVAL;
		} else {
			exp = 31;
			man = 511;
		}
    
	} else if (rate) {
		/* representable rate */
    
		exp = 31;
		man = rate;
    
		/* invariant: rate = man*2^(exp-31) */
		while (!(man & (1<<31))) {
			exp = exp - 1;
			man = man<<1;
		}
    
		/* man has top bit set
		   rate = (2^31+(man-2^31))*2^(exp-31)
		   rate = (1+(man-2^31)/2^31)*2^exp 
		*/
		man = man<<1;
		man &= 0xffffffffU; /* a nop on 32-bit systems */
		/* rate = (1+man/2^32)*2^exp
    
		   exp is in the range 0 to 31, man is in the range 0 to 2^32-1
		   time to lose significance... we want m in the range 0 to 2^9-1
		   rounding presents a minor problem... we first decide which way
		   we are rounding (based on given rounding direction and possibly
		   the bits of the mantissa that are to be discarded).
		*/

		switch (r) {
		case ROUND_DOWN: {
			/* just truncate */
			man = man>>(32-9);
			break;
		}
		case ROUND_UP: {
			/* check all bits that we are discarding */
515
			if (man & (~0U>>9)) {
Linus Torvalds's avatar
Linus Torvalds committed
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
				man = (man>>(32-9)) + 1;
				if (man == (1<<9)) {
					/* no need to check for round up outside of range */
					man = 0;
					exp += 1;
				}
			} else {
				man = (man>>(32-9));
			}
			break;
		}
		case ROUND_NEAREST: {
			/* check msb that we are discarding */
			if (man & (1<<(32-9-1))) {
				man = (man>>(32-9)) + 1;
				if (man == (1<<9)) {
					/* no need to check for round up outside of range */
					man = 0;
					exp += 1;
				}
			} else {
				man = (man>>(32-9));
			}
			break;
		}
		}
    
	} else {
		/* zero rate - not representable */
    
		if (r == ROUND_DOWN) {
			return -EINVAL;
		} else {
			exp = 0;
			man = 0;
		}
	}
  
	fs_dprintk (FS_DEBUG_QOS, "rate: man=%u, exp=%hu", man, exp);
  
	if (bits)
		*bits = /* (1<<14) | */ (exp<<9) | man;
  
	if (actual)
		*actual = (exp >= 9)
			? (1 << exp) + (man << (exp-9))
			: (1 << exp) + ((man + (1<<(9-exp-1))) >> (9-exp));
  
	return 0;
}




/* FireStream access routines */
/* For DEEP-DOWN debugging these can be rigged to intercept accesses to
   certain registers or to just log all accesses. */

static inline void write_fs (struct fs_dev *dev, int offset, u32 val)
{
	writel (val, dev->base + offset);
}


static inline u32  read_fs (struct fs_dev *dev, int offset)
{
	return readl (dev->base + offset);
}



static inline struct FS_QENTRY *get_qentry (struct fs_dev *dev, struct queue *q)
{
	return bus_to_virt (read_fs (dev, Q_WP(q->offset)) & Q_ADDR_MASK);
}


static void submit_qentry (struct fs_dev *dev, struct queue *q, struct FS_QENTRY *qe)
{
	u32 wp;
	struct FS_QENTRY *cqe;

	/* XXX Sanity check: the write pointer can be checked to be 
	   still the same as the value passed as qe... -- REW */
	/*  udelay (5); */
	while ((wp = read_fs (dev, Q_WP (q->offset))) & Q_FULL) {
		fs_dprintk (FS_DEBUG_TXQ, "Found queue at %x full. Waiting.\n", 
			    q->offset);
		schedule ();
	}

	wp &= ~0xf;
	cqe = bus_to_virt (wp);
	if (qe != cqe) {
		fs_dprintk (FS_DEBUG_TXQ, "q mismatch! %p %p\n", qe, cqe);
	}

	write_fs (dev, Q_WP(q->offset), Q_INCWRAP);

	{
		static int c;
		if (!(c++ % 100))
			{
				int rp, wp;
				rp =  read_fs (dev, Q_RP(q->offset));
				wp =  read_fs (dev, Q_WP(q->offset));
				fs_dprintk (FS_DEBUG_TXQ, "q at %d: %x-%x: %x entries.\n", 
					    q->offset, rp, wp, wp-rp);
			}
	}
}

#ifdef DEBUG_EXTRA
static struct FS_QENTRY pq[60];
static int qp;

static struct FS_BPENTRY dq[60];
static int qd;
static void *da[60];
#endif 

static void submit_queue (struct fs_dev *dev, struct queue *q, 
			  u32 cmd, u32 p1, u32 p2, u32 p3)
{
	struct FS_QENTRY *qe;

	qe = get_qentry (dev, q);
	qe->cmd = cmd;
	qe->p0 = p1;
	qe->p1 = p2;
	qe->p2 = p3;
	submit_qentry (dev,  q, qe);

#ifdef DEBUG_EXTRA
	pq[qp].cmd = cmd;
	pq[qp].p0 = p1;
	pq[qp].p1 = p2;
	pq[qp].p2 = p3;
	qp++;
	if (qp >= 60) qp = 0;
#endif
}

/* Test the "other" way one day... -- REW */
#if 1
#define submit_command submit_queue
#else

static void submit_command (struct fs_dev *dev, struct queue *q, 
			    u32 cmd, u32 p1, u32 p2, u32 p3)
{
	write_fs (dev, CMDR0, cmd);
	write_fs (dev, CMDR1, p1);
	write_fs (dev, CMDR2, p2);
	write_fs (dev, CMDR3, p3);
}
#endif



static void process_return_queue (struct fs_dev *dev, struct queue *q)
{
	long rq;
	struct FS_QENTRY *qe;
	void *tc;
  
	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping return queue entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x. (%d)\n", 
			    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));

		switch (STATUS_CODE (qe)) {
		case 5:
			tc = bus_to_virt (qe->p0);
			fs_dprintk (FS_DEBUG_ALLOC, "Free tc: %p\n", tc);
			kfree (tc);
			break;
		}
    
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}


static void process_txdone_queue (struct fs_dev *dev, struct queue *q)
{
	long rq;
	long tmp;
	struct FS_QENTRY *qe;
	struct sk_buff *skb;
	struct FS_BPENTRY *td;

	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping txdone entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x: %d\n", 
			    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));

		if (STATUS_CODE (qe) != 2)
			fs_dprintk (FS_DEBUG_TXMEM, "queue entry: %08x %08x %08x %08x: %d\n", 
				    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));


		switch (STATUS_CODE (qe)) {
		case 0x01: /* This is for AAL0 where we put the chip in streaming mode */
			/* Fall through */
		case 0x02:
			/* Process a real txdone entry. */
			tmp = qe->p0;
			if (tmp & 0x0f)
				printk (KERN_WARNING "td not aligned: %ld\n", tmp);
			tmp &= ~0x0f;
			td = bus_to_virt (tmp);

			fs_dprintk (FS_DEBUG_QUEUE, "Pool entry: %08x %08x %08x %08x %p.\n", 
				    td->flags, td->next, td->bsa, td->aal_bufsize, td->skb );
      
			skb = td->skb;
			if (skb == FS_VCC (ATM_SKB(skb)->vcc)->last_skb) {
				wake_up_interruptible (& FS_VCC (ATM_SKB(skb)->vcc)->close_wait);
				FS_VCC (ATM_SKB(skb)->vcc)->last_skb = NULL;
			}
			td->dev->ntxpckts--;

			{
				static int c=0;
	
				if (!(c++ % 100)) {
					fs_dprintk (FS_DEBUG_QSIZE, "[%d]", td->dev->ntxpckts);
				}
			}

			atomic_inc(&ATM_SKB(skb)->vcc->stats->tx);

			fs_dprintk (FS_DEBUG_TXMEM, "i");
			fs_dprintk (FS_DEBUG_ALLOC, "Free t-skb: %p\n", skb);
			fs_kfree_skb (skb);

			fs_dprintk (FS_DEBUG_ALLOC, "Free trans-d: %p\n", td); 
758
			memset (td, ATM_POISON_FREE, sizeof(struct FS_BPENTRY));
Linus Torvalds's avatar
Linus Torvalds committed
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
			kfree (td);
			break;
		default:
			/* Here we get the tx purge inhibit command ... */
			/* Action, I believe, is "don't do anything". -- REW */
			;
		}
    
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}


static void process_incoming (struct fs_dev *dev, struct queue *q)
{
	long rq;
	struct FS_QENTRY *qe;
	struct FS_BPENTRY *pe;    
	struct sk_buff *skb;
	unsigned int channo;
	struct atm_vcc *atm_vcc;

	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping incoming queue entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x.  ", 
			    qe->cmd, qe->p0, qe->p1, qe->p2);

		fs_dprintk (FS_DEBUG_QUEUE, "-> %x: %s\n", 
			    STATUS_CODE (qe), 
			    res_strings[STATUS_CODE(qe)]);

		pe = bus_to_virt (qe->p0);
		fs_dprintk (FS_DEBUG_QUEUE, "Pool entry: %08x %08x %08x %08x %p %p.\n", 
			    pe->flags, pe->next, pe->bsa, pe->aal_bufsize, 
			    pe->skb, pe->fp);
      
		channo = qe->cmd & 0xffff;

		if (channo < dev->nchannels)
			atm_vcc = dev->atm_vccs[channo];
		else
			atm_vcc = NULL;

		/* Single buffer packet */
		switch (STATUS_CODE (qe)) {
		case 0x1:
			/* Fall through for streaming mode */
		case 0x2:/* Packet received OK.... */
			if (atm_vcc) {
				skb = pe->skb;
				pe->fp->n--;
#if 0
				fs_dprintk (FS_DEBUG_QUEUE, "Got skb: %p\n", skb);
				if (FS_DEBUG_QUEUE & fs_debug) my_hd (bus_to_virt (pe->bsa), 0x20);
#endif
				skb_put (skb, qe->p1 & 0xffff); 
				ATM_SKB(skb)->vcc = atm_vcc;
				atomic_inc(&atm_vcc->stats->rx);
819
				__net_timestamp(skb);
Linus Torvalds's avatar
Linus Torvalds committed
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p (pushed)\n", skb);
				atm_vcc->push (atm_vcc, skb);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", pe);
				kfree (pe);
			} else {
				printk (KERN_ERR "Got a receive on a non-open channel %d.\n", channo);
			}
			break;
		case 0x17:/* AAL 5 CRC32 error. IFF the length field is nonzero, a buffer
			     has been consumed and needs to be processed. -- REW */
			if (qe->p1 & 0xffff) {
				pe = bus_to_virt (qe->p0);
				pe->fp->n--;
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p\n", pe->skb);
				dev_kfree_skb_any (pe->skb);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", pe);
				kfree (pe);
			}
			if (atm_vcc)
				atomic_inc(&atm_vcc->stats->rx_drop);
			break;
		case 0x1f: /*  Reassembly abort: no buffers. */
			/* Silently increment error counter. */
			if (atm_vcc)
				atomic_inc(&atm_vcc->stats->rx_drop);
			break;
		default: /* Hmm. Haven't written the code to handle the others yet... -- REW */
			printk (KERN_WARNING "Don't know what to do with RX status %x: %s.\n", 
				STATUS_CODE(qe), res_strings[STATUS_CODE (qe)]);
		}
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}



#define DO_DIRECTION(tp) ((tp)->traffic_class != ATM_NONE)

static int fs_open(struct atm_vcc *atm_vcc)
{
	struct fs_dev *dev;
	struct fs_vcc *vcc;
	struct fs_transmit_config *tc;
	struct atm_trafprm * txtp;
	struct atm_trafprm * rxtp;
	/*  struct fs_receive_config *rc;*/
	/*  struct FS_QENTRY *qe; */
	int error;
	int bfp;
	int to;
	unsigned short tmc0;
	short vpi = atm_vcc->vpi;
	int vci = atm_vcc->vci;

	func_enter ();

	dev = FS_DEV(atm_vcc->dev);
	fs_dprintk (FS_DEBUG_OPEN, "fs: open on dev: %p, vcc at %p\n", 
		    dev, atm_vcc);

	if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
		set_bit(ATM_VF_ADDR, &atm_vcc->flags);

	if ((atm_vcc->qos.aal != ATM_AAL5) &&
	    (atm_vcc->qos.aal != ATM_AAL2))
	  return -EINVAL; /* XXX AAL0 */

	fs_dprintk (FS_DEBUG_OPEN, "fs: (itf %d): open %d.%d\n", 
		    atm_vcc->dev->number, atm_vcc->vpi, atm_vcc->vci);	

	/* XXX handle qos parameters (rate limiting) ? */

	vcc = kmalloc(sizeof(struct fs_vcc), GFP_KERNEL);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc VCC: %p(%Zd)\n", vcc, sizeof(struct fs_vcc));
	if (!vcc) {
		clear_bit(ATM_VF_ADDR, &atm_vcc->flags);
		return -ENOMEM;
	}
  
	atm_vcc->dev_data = vcc;
	vcc->last_skb = NULL;

	init_waitqueue_head (&vcc->close_wait);

	txtp = &atm_vcc->qos.txtp;
	rxtp = &atm_vcc->qos.rxtp;

	if (!test_bit(ATM_VF_PARTIAL, &atm_vcc->flags)) {
		if (IS_FS50(dev)) {
			/* Increment the channel numer: take a free one next time.  */
			for (to=33;to;to--, dev->channo++) {
				/* We only have 32 channels */
				if (dev->channo >= 32)
					dev->channo = 0;
				/* If we need to do RX, AND the RX is inuse, try the next */
				if (DO_DIRECTION(rxtp) && dev->atm_vccs[dev->channo])
					continue;
				/* If we need to do TX, AND the TX is inuse, try the next */
				if (DO_DIRECTION(txtp) && test_bit (dev->channo, dev->tx_inuse))
					continue;
				/* Ok, both are free! (or not needed) */
				break;
			}
			if (!to) {
				printk ("No more free channels for FS50..\n");
				return -EBUSY;
			}
			vcc->channo = dev->channo;
			dev->channo &= dev->channel_mask;
      
		} else {
			vcc->channo = (vpi << FS155_VCI_BITS) | (vci);
			if (((DO_DIRECTION(rxtp) && dev->atm_vccs[vcc->channo])) ||
			    ( DO_DIRECTION(txtp) && test_bit (vcc->channo, dev->tx_inuse))) {
				printk ("Channel is in use for FS155.\n");
				return -EBUSY;
			}
		}
		fs_dprintk (FS_DEBUG_OPEN, "OK. Allocated channel %x(%d).\n", 
			    vcc->channo, vcc->channo);
	}

	if (DO_DIRECTION (txtp)) {
		tc = kmalloc (sizeof (struct fs_transmit_config), GFP_KERNEL);
		fs_dprintk (FS_DEBUG_ALLOC, "Alloc tc: %p(%Zd)\n",
			    tc, sizeof (struct fs_transmit_config));
		if (!tc) {
			fs_dprintk (FS_DEBUG_OPEN, "fs: can't alloc transmit_config.\n");
			return -ENOMEM;
		}

		/* Allocate the "open" entry from the high priority txq. This makes
		   it most likely that the chip will notice it. It also prevents us
		   from having to wait for completion. On the other hand, we may
		   need to wait for completion anyway, to see if it completed
Andreas Mohr's avatar
Andreas Mohr committed
955
		   successfully. */
Linus Torvalds's avatar
Linus Torvalds committed
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000

		switch (atm_vcc->qos.aal) {
		case ATM_AAL2:
		case ATM_AAL0:
		  tc->flags = 0
		    | TC_FLAGS_TRANSPARENT_PAYLOAD
		    | TC_FLAGS_PACKET
		    | (1 << 28)
		    | TC_FLAGS_TYPE_UBR /* XXX Change to VBR -- PVDL */
		    | TC_FLAGS_CAL0;
		  break;
		case ATM_AAL5:
		  tc->flags = 0
			| TC_FLAGS_AAL5
			| TC_FLAGS_PACKET  /* ??? */
			| TC_FLAGS_TYPE_CBR
			| TC_FLAGS_CAL0;
		  break;
		default:
			printk ("Unknown aal: %d\n", atm_vcc->qos.aal);
			tc->flags = 0;
		}
		/* Docs are vague about this atm_hdr field. By the way, the FS
		 * chip makes odd errors if lower bits are set.... -- REW */
		tc->atm_hdr =  (vpi << 20) | (vci << 4); 
		{
			int pcr = atm_pcr_goal (txtp);

			fs_dprintk (FS_DEBUG_OPEN, "pcr = %d.\n", pcr);

			/* XXX Hmm. officially we're only allowed to do this if rounding 
			   is round_down -- REW */
			if (IS_FS50(dev)) {
				if (pcr > 51840000/53/8)  pcr = 51840000/53/8;
			} else {
				if (pcr > 155520000/53/8) pcr = 155520000/53/8;
			}
			if (!pcr) {
				/* no rate cap */
				tmc0 = IS_FS50(dev)?0x61BE:0x64c9; /* Just copied over the bits from Fujitsu -- REW */
			} else {
				int r;
				if (pcr < 0) {
					r = ROUND_DOWN;
					pcr = -pcr;
For faster browsing, not all history is shown. View entire blame