aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/prism54/islpci_mgt.c
blob: adb289723a967e5fe474332e1c256b7aa94649ad (plain)
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
36
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
/*
 *  Copyright (C) 2002 Intersil Americas Inc.
 *  Copyright 2004 Jens Maurer <Jens.Maurer@gmx.net>
 *
 *  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
 *
 *  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
 *
 */

#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <asm/io.h>
#include <asm/system.h>
#include <linux/if_arp.h>

#include "prismcompat.h"
#include "isl_38xx.h"
#include "islpci_mgt.h"
#include "isl_oid.h"		/* additional types and defs for isl38xx fw */
#include "isl_ioctl.h"

#include <net/iw_handler.h>

/******************************************************************************
        Global variable definition section
******************************************************************************/
int pc_debug = VERBOSE;
module_param(pc_debug, int, 0);

/******************************************************************************
    Driver general functions
******************************************************************************/
#if VERBOSE > SHOW_ERROR_MESSAGES
void
display_buffer(char *buffer, int length)
{
	if ((pc_debug & SHOW_BUFFER_CONTENTS) == 0)
		return;

	while (length > 0) {
		printk("[%02x]", *buffer & 255);
		length--;
		buffer++;
	}

	printk("\n");
}
#endif

/*****************************************************************************
    Queue handling for management frames
******************************************************************************/

/*
 * Helper function to create a PIMFOR management frame header.
 */
static void
pimfor_encode_header(int operation, u32 oid, u32 length, pimfor_header_t *h)
{
	h->version = PIMFOR_VERSION;
	h->operation = operation;
	h->device_id = PIMFOR_DEV_ID_MHLI_MIB;
	h->flags = 0;
	h->oid = cpu_to_be32(oid);
	h->length = cpu_to_be32(length);
}

/*
 * Helper function to analyze a PIMFOR management frame header.
 */
static pimfor_header_t *
pimfor_decode_header(void *data, int len)
{
	pimfor_header_t *h = data;

	while ((void *) h < data + len) {
		if (h->flags & PIMFOR_FLAG_LITTLE_ENDIAN) {
			le32_to_cpus(&h->oid);
			le32_to_cpus(&h->length);
		} else {
			be32_to_cpus(&h->oid);
			be32_to_cpus(&h->length);
		}
		if (h->oid != OID_INL_TUNNEL)
			return h;
		h++;
	}
	return NULL;
}

/*
 * Fill the receive queue for management frames with fresh buffers.
 */
int
islpci_mgmt_rx_fill(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);
	isl38xx_control_block *cb =	/* volatile not needed */
	    (isl38xx_control_block *) priv->control_block;
	u32 curr = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ]);

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgmt_rx_fill \n");
#endif

	while (curr - priv->index_mgmt_rx < ISL38XX_CB_MGMT_QSIZE) {
		u32 index = curr % ISL38XX_CB_MGMT_QSIZE;
		struct islpci_membuf *buf = &priv->mgmt_rx[index];
		isl38xx_fragment *frag = &cb->rx_data_mgmt[index];

		if (buf->mem == NULL) {
			buf->mem = kmalloc(MGMT_FRAME_SIZE, GFP_ATOMIC);
			if (!buf->mem) {
				printk(KERN_WARNING
				       "Error allocating management frame.\n");
				return -ENOMEM;
			}
			buf->size = MGMT_FRAME_SIZE;
		}
		if (buf->pci_addr == 0) {
			buf->pci_addr = pci_map_single(priv->pdev, buf->mem,
						       MGMT_FRAME_SIZE,
						       PCI_DMA_FROMDEVICE);
			if (!buf->pci_addr) {
				printk(KERN_WARNING
				       "Failed to make memory DMA'able.\n");
				return -ENOMEM;
			}
		}

		/* be safe: always reset control block information */
		frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
		frag->flags = 0;
		frag->address = cpu_to_le32(buf->pci_addr);
		curr++;

		/* The fragment address in the control block must have
		 * been written before announcing the frame buffer to
		 * device */
		wmb();
		cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] = cpu_to_le32(curr);
	}
	return 0;
}

/*
 * Create and transmit a management frame using "operation" and "oid",
 * with arguments data/length.
 * We either return an error and free the frame, or we return 0 and
 * islpci_mgt_cleanup_transmit() frees the frame in the tx-done
 * interrupt.
 */
static int
islpci_mgt_transmit(struct net_device *ndev, int operation, unsigned long oid,
		    void *data, int length)
{
	islpci_private *priv = netdev_priv(ndev);
	isl38xx_control_block *cb =
	    (isl38xx_control_block *) priv->control_block;
	void *p;
	int err = -EINVAL;
	unsigned long flags;
	isl38xx_fragment *frag;
	struct islpci_membuf buf;
	u32 curr_frag;
	int index;
	int frag_len = length + PIMFOR_HEADER_SIZE;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_transmit\n");
#endif

	if (frag_len > MGMT_FRAME_SIZE) {
		printk(KERN_DEBUG "%s: mgmt frame too large %d\n",
		       ndev->name, frag_len);
		goto error;
	}

	err = -ENOMEM;
	p = buf.mem = kmalloc(frag_len, GFP_KERNEL);
	if (!buf.mem) {
		printk(KERN_DEBUG "%s: cannot allocate mgmt frame\n",
		       ndev->name);
		goto error;
	}
	buf.size = frag_len;

	/* create the header directly in the fragment data area */
	pimfor_encode_header(operation, oid, length, (pimfor_header_t *) p);
	p += PIMFOR_HEADER_SIZE;

	if (data)
		memcpy(p, data, length);
	else
		memset(p, 0, length);

#if VERBOSE > SHOW_ERROR_MESSAGES
	{
		pimfor_header_t *h = buf.mem;
		DEBUG(SHOW_PIMFOR_FRAMES,
		      "PIMFOR: op %i, oid 0x%08lx, device %i, flags 0x%x length 0x%x \n",
		      h->operation, oid, h->device_id, h->flags, length);

		/* display the buffer contents for debugging */
		display_buffer((char *) h, sizeof (pimfor_header_t));
		display_buffer(p, length);
	}
#endif

	err = -ENOMEM;
	buf.pci_addr = pci_map_single(priv->pdev, buf.mem, frag_len,
				      PCI_DMA_TODEVICE);
	if (!buf.pci_addr) {
		printk(KERN_WARNING "%s: cannot map PCI memory for mgmt\n",
		       ndev->name);
		goto error_free;
	}

	/* Protect the control block modifications against interrupts. */
	spin_lock_irqsave(&priv->slock, flags);
	curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ]);
	if (curr_frag - priv->index_mgmt_tx >= ISL38XX_CB_MGMT_QSIZE) {
		printk(KERN_WARNING "%s: mgmt tx queue is still full\n",
		       ndev->name);
		goto error_unlock;
	}

	/* commit the frame to the tx device queue */
	index = curr_frag % ISL38XX_CB_MGMT_QSIZE;
	priv->mgmt_tx[index] = buf;
	frag = &cb->tx_data_mgmt[index];
	frag->size = cpu_to_le16(frag_len);
	frag->flags = 0;	/* for any other than the last fragment, set to 1 */
	frag->address = cpu_to_le32(buf.pci_addr);

	/* The fragment address in the control block must have
	 * been written before announcing the frame buffer to
	 * device */
	wmb();
	cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ] = cpu_to_le32(curr_frag + 1);
	spin_unlock_irqrestore(&priv->slock, flags);

	/* trigger the device */
	islpci_trigger(priv);
	return 0;

      error_unlock:
	spin_unlock_irqrestore(&priv->slock, flags);
      error_free:
	kfree(buf.mem);
      error:
	return err;
}

/*
 * Receive a management frame from the device.
 * This can be an arbitrary number of traps, and at most one response
 * frame for a previous request sent via islpci_mgt_transmit().
 */
int
islpci_mgt_receive(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);
	isl38xx_control_block *cb =
	    (isl38xx_control_block *) priv->control_block;
	u32 curr_frag;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_receive \n");
#endif

	/* Only once per interrupt, determine fragment range to
	 * process.  This avoids an endless loop (i.e. lockup) if
	 * frames come in faster than we can process them. */
	curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_RX_MGMTQ]);
	barrier();

	for (; priv->index_mgmt_rx < curr_frag; priv->index_mgmt_rx++) {
		pimfor_header_t *header;
		u32 index = priv->index_mgmt_rx % ISL38XX_CB_MGMT_QSIZE;
		struct islpci_membuf *buf = &priv->mgmt_rx[index];
		u16 frag_len;
		int size;
		struct islpci_mgmtframe *frame;

		/* I have no idea (and no documentation) if flags != 0
		 * is possible.  Drop the frame, reuse the buffer. */
		if (le16_to_cpu(cb->rx_data_mgmt[index].flags) != 0) {
			printk(KERN_WARNING "%s: unknown flags 0x%04x\n",
			       ndev->name,
			       le16_to_cpu(cb->rx_data_mgmt[index].flags));
			continue;
		}

		/* The device only returns the size of the header(s) here. */
		frag_len = le16_to_cpu(cb->rx_data_mgmt[index].size);

		/*
		 * We appear to have no way to tell the device the
		 * size of a receive buffer.  Thus, if this check
		 * triggers, we likely have kernel heap corruption. */
		if (frag_len > MGMT_FRAME_SIZE) {
			printk(KERN_WARNING
				"%s: Bogus packet size of %d (%#x).\n",
				ndev->name, frag_len, frag_len);
			frag_len = MGMT_FRAME_SIZE;
		}

		/* Ensure the results of device DMA are visible to the CPU. */
		pci_dma_sync_single_for_cpu(priv->pdev, buf->pci_addr,
					    buf->size, PCI_DMA_FROMDEVICE);

		/* Perform endianess conversion for PIMFOR header in-place. */
		header = pimfor_decode_header(buf->mem, frag_len);
		if (!header) {
			printk(KERN_WARNING "%s: no PIMFOR header found\n",
			       ndev->name);
			continue;
		}

		/* The device ID from the PIMFOR packet received from
		 * the MVC is always 0.  We forward a sensible device_id.
		 * Not that anyone upstream would care... */
		header->device_id = priv->ndev->ifindex;

#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_PIMFOR_FRAMES,
		      "PIMFOR: op %i, oid 0x%08x, device %i, flags 0x%x length 0x%x \n",
		      header->operation, header->oid, header->device_id,
		      header->flags, header->length);

		/* display the buffer contents for debugging */
		display_buffer((char *) header, PIMFOR_HEADER_SIZE);
		display_buffer((char *) header + PIMFOR_HEADER_SIZE,
			       header->length);
#endif

		/* nobody sends these */
		if (header->flags & PIMFOR_FLAG_APPLIC_ORIGIN) {
			printk(KERN_DEBUG
			       "%s: errant PIMFOR application frame\n",
			       ndev->name);
			continue;
		}

		/* Determine frame size, skipping OID_INL_TUNNEL headers. */
		size = PIMFOR_HEADER_SIZE + header->length;
		frame = kmalloc(sizeof (struct islpci_mgmtframe) + size,
				GFP_ATOMIC);
		if (!frame) {
			printk(KERN_WARNING
			       "%s: Out of memory, cannot handle oid 0x%08x\n",
			       ndev->name, header->oid);
			continue;
		}
		frame->ndev = ndev;
		memcpy(&frame->buf, header, size);
		frame->header = (pimfor_header_t *) frame->buf;
		frame->data = frame->buf + PIMFOR_HEADER_SIZE;

#if VERBOSE > SHOW_ERROR_MESSAGES
		DEBUG(SHOW_PIMFOR_FRAMES,
		      "frame: header: %p, data: %p, size: %d\n",
		      frame->header, frame->data, size);
#endif

		if (header->operation == PIMFOR_OP_TRAP) {
#if VERBOSE > SHOW_ERROR_MESSAGES
			printk(KERN_DEBUG
			       "TRAP: oid 0x%x, device %i, flags 0x%x length %i\n",
			       header->oid, header->device_id, header->flags,
			       header->length);
#endif

			/* Create work to handle trap out of interrupt
			 * context. */
			INIT_WORK(&frame->ws, prism54_process_trap);
			schedule_work(&frame->ws);

		} else {
			/* Signal the one waiting process that a response
			 * has been received. */
			if ((frame = xchg(&priv->mgmt_received, frame)) != NULL) {
				printk(KERN_WARNING
				       "%s: mgmt response not collected\n",
				       ndev->name);
				kfree(frame);
			}
#if VERBOSE > SHOW_ERROR_MESSAGES
			DEBUG(SHOW_TRACING, "Wake up Mgmt Queue\n");
#endif
			wake_up(&priv->mgmt_wqueue);
		}

	}

	return 0;
}

/*
 * Cleanup the transmit queue by freeing all frames handled by the device.
 */
void
islpci_mgt_cleanup_transmit(struct net_device *ndev)
{
	islpci_private *priv = netdev_priv(ndev);
	isl38xx_control_block *cb =	/* volatile not needed */
	    (isl38xx_control_block *) priv->control_block;
	u32 curr_frag;

#if VERBOSE > SHOW_ERROR_MESSAGES
	DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_cleanup_transmit\n");
#endif

	/* Only once per cleanup, determine fragment range to
	 * process.  This avoids an endless loop (i.e. lockup) if
	 * the device became confused, incrementing device_curr_frag
	 * rapidly. */
	curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_TX_MGMTQ]);
	barrier();

	for (; priv->index_mgmt_tx < curr_frag; priv->index_mgmt_tx++) {
		int index = priv->index_mgmt_tx % ISL38XX_CB_MGMT_QSIZE;
		struct islpci_membuf *buf = &priv->mgmt_tx[index];
		pci_unmap_single(priv->pdev, buf->pci_addr, buf->size,
				 PCI_DMA_TODEVICE);
		buf->pci_addr = 0;
		kfree(buf->mem);
		buf->mem = NULL;
		buf->size = 0;
	}
}

/*
 * Perform one request-response transaction to the device.
 */
int
islpci_mgt_transaction(struct net_device *ndev,
		       int operation, unsigned long oid,
		       void *senddata, int sendlen,
		       struct islpci_mgmtframe **recvframe)
{
	islpci_private *priv = netdev_priv(ndev);
	const long wait_cycle_jiffies = msecs_to_jiffies(ISL38XX_WAIT_CYCLE * 10);
	long timeout_left = ISL38XX_MAX_WAIT_CYCLES * wait_cycle_jiffies;
	int err;
	DEFINE_WAIT(wait);

	*recvframe = NULL;

	if (mutex_lock_interruptible(&priv->mgmt_lock))
		return -ERESTARTSYS;

	prepare_to_wait(&priv->mgmt_wqueue, &wait, TASK_UNINTERRUPTIBLE);
	err = islpci_mgt_transmit(ndev, operation, oid, senddata, sendlen);
	if (err)
		goto out;

	err = -ETIMEDOUT;
	while (timeout_left > 0) {
		int timeleft;
		struct islpci_mgmtframe *frame;

		timeleft = schedule_timeout_uninterruptible(wait_cycle_jiffies);
		frame = xchg(&priv->mgmt_received, NULL);
		if (frame) {
			if (frame->header->oid == oid) {
				*recvframe = frame;
				err = 0;
				goto out;
			} else {
				printk(KERN_DEBUG
				       "%s: expecting oid 0x%x, received 0x%x.\n",
				       ndev->name, (unsigned int) oid,
				       frame->header->oid);
				kfree(frame);
				frame = NULL;
			}
		}
		if (timeleft == 0) {
			printk(KERN_DEBUG
				"%s: timeout waiting for mgmt response %lu, "
				"triggering device\n",
				ndev->name, timeout_left);
			islpci_trigger(priv);
		}
		timeout_left += timeleft - wait_cycle_jiffies;
	}
	printk(KERN_WARNING "%s: timeout waiting for mgmt response\n",
	       ndev->name);

	/* TODO: we should reset the device here */
 out:
	finish_wait(&priv->mgmt_wqueue, &wait);
	mutex_unlock(&priv->mgmt_lock);
	return err;
}