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Pull bugzilla-9429 into release branch
[pv_ops_mirror.git] / drivers / net / wireless / prism54 / islpci_mgt.c
blob2246f7930b4edfd45aeac66a5bdf4c194ce91a96
1 /*
2 * Copyright (C) 2002 Intersil Americas Inc.
3 * Copyright 2004 Jens Maurer <Jens.Maurer@gmx.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20 #include <linux/netdevice.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23
24 #include <asm/io.h>
25 #include <asm/system.h>
26 #include <linux/if_arp.h>
27
28 #include "prismcompat.h"
29 #include "isl_38xx.h"
30 #include "islpci_mgt.h"
31 #include "isl_oid.h" /* additional types and defs for isl38xx fw */
32 #include "isl_ioctl.h"
33
34 #include <net/iw_handler.h>
35
36 /******************************************************************************
37 Global variable definition section
38 ******************************************************************************/
39 int pc_debug = VERBOSE;
40 module_param(pc_debug, int, 0);
41
42 /******************************************************************************
43 Driver general functions
44 ******************************************************************************/
45 #if VERBOSE > SHOW_ERROR_MESSAGES
46 void
47 display_buffer(char *buffer, int length)
48 {
49 if ((pc_debug & SHOW_BUFFER_CONTENTS) == 0)
50 return;
51
52 while (length > 0) {
53 printk("[%02x]", *buffer & 255);
54 length--;
55 buffer++;
56 }
57
58 printk("\n");
59 }
60 #endif
61
62 /*****************************************************************************
63 Queue handling for management frames
64 ******************************************************************************/
65
66 /*
67 * Helper function to create a PIMFOR management frame header.
68 */
69 static void
70 pimfor_encode_header(int operation, u32 oid, u32 length, pimfor_header_t *h)
71 {
72 h->version = PIMFOR_VERSION;
73 h->operation = operation;
74 h->device_id = PIMFOR_DEV_ID_MHLI_MIB;
75 h->flags = 0;
76 h->oid = cpu_to_be32(oid);
77 h->length = cpu_to_be32(length);
78 }
79
80 /*
81 * Helper function to analyze a PIMFOR management frame header.
82 */
83 static pimfor_header_t *
84 pimfor_decode_header(void *data, int len)
85 {
86 pimfor_header_t *h = data;
87
88 while ((void *) h < data + len) {
89 if (h->flags & PIMFOR_FLAG_LITTLE_ENDIAN) {
90 le32_to_cpus(&h->oid);
91 le32_to_cpus(&h->length);
92 } else {
93 be32_to_cpus(&h->oid);
94 be32_to_cpus(&h->length);
95 }
96 if (h->oid != OID_INL_TUNNEL)
97 return h;
98 h++;
99 }
100 return NULL;
101 }
102
103 /*
104 * Fill the receive queue for management frames with fresh buffers.
105 */
106 int
107 islpci_mgmt_rx_fill(struct net_device *ndev)
108 {
109 islpci_private *priv = netdev_priv(ndev);
110 isl38xx_control_block *cb = /* volatile not needed */
111 (isl38xx_control_block *) priv->control_block;
112 u32 curr = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ]);
113
114 #if VERBOSE > SHOW_ERROR_MESSAGES
115 DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgmt_rx_fill \n");
116 #endif
117
118 while (curr - priv->index_mgmt_rx < ISL38XX_CB_MGMT_QSIZE) {
119 u32 index = curr % ISL38XX_CB_MGMT_QSIZE;
120 struct islpci_membuf *buf = &priv->mgmt_rx[index];
121 isl38xx_fragment *frag = &cb->rx_data_mgmt[index];
122
123 if (buf->mem == NULL) {
124 buf->mem = kmalloc(MGMT_FRAME_SIZE, GFP_ATOMIC);
125 if (!buf->mem) {
126 printk(KERN_WARNING
127 "Error allocating management frame.\n");
128 return -ENOMEM;
129 }
130 buf->size = MGMT_FRAME_SIZE;
131 }
132 if (buf->pci_addr == 0) {
133 buf->pci_addr = pci_map_single(priv->pdev, buf->mem,
134 MGMT_FRAME_SIZE,
135 PCI_DMA_FROMDEVICE);
136 if (!buf->pci_addr) {
137 printk(KERN_WARNING
138 "Failed to make memory DMA'able.\n");
139 return -ENOMEM;
140 }
141 }
142
143 /* be safe: always reset control block information */
144 frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
145 frag->flags = 0;
146 frag->address = cpu_to_le32(buf->pci_addr);
147 curr++;
148
149 /* The fragment address in the control block must have
150 * been written before announcing the frame buffer to
151 * device */
152 wmb();
153 cb->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] = cpu_to_le32(curr);
154 }
155 return 0;
156 }
157
158 /*
159 * Create and transmit a management frame using "operation" and "oid",
160 * with arguments data/length.
161 * We either return an error and free the frame, or we return 0 and
162 * islpci_mgt_cleanup_transmit() frees the frame in the tx-done
163 * interrupt.
164 */
165 static int
166 islpci_mgt_transmit(struct net_device *ndev, int operation, unsigned long oid,
167 void *data, int length)
168 {
169 islpci_private *priv = netdev_priv(ndev);
170 isl38xx_control_block *cb =
171 (isl38xx_control_block *) priv->control_block;
172 void *p;
173 int err = -EINVAL;
174 unsigned long flags;
175 isl38xx_fragment *frag;
176 struct islpci_membuf buf;
177 u32 curr_frag;
178 int index;
179 int frag_len = length + PIMFOR_HEADER_SIZE;
180
181 #if VERBOSE > SHOW_ERROR_MESSAGES
182 DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_transmit\n");
183 #endif
184
185 if (frag_len > MGMT_FRAME_SIZE) {
186 printk(KERN_DEBUG "%s: mgmt frame too large %d\n",
187 ndev->name, frag_len);
188 goto error;
189 }
190
191 err = -ENOMEM;
192 p = buf.mem = kmalloc(frag_len, GFP_KERNEL);
193 if (!buf.mem) {
194 printk(KERN_DEBUG "%s: cannot allocate mgmt frame\n",
195 ndev->name);
196 goto error;
197 }
198 buf.size = frag_len;
199
200 /* create the header directly in the fragment data area */
201 pimfor_encode_header(operation, oid, length, (pimfor_header_t *) p);
202 p += PIMFOR_HEADER_SIZE;
203
204 if (data)
205 memcpy(p, data, length);
206 else
207 memset(p, 0, length);
208
209 #if VERBOSE > SHOW_ERROR_MESSAGES
210 {
211 pimfor_header_t *h = buf.mem;
212 DEBUG(SHOW_PIMFOR_FRAMES,
213 "PIMFOR: op %i, oid 0x%08lx, device %i, flags 0x%x length 0x%x \n",
214 h->operation, oid, h->device_id, h->flags, length);
215
216 /* display the buffer contents for debugging */
217 display_buffer((char *) h, sizeof (pimfor_header_t));
218 display_buffer(p, length);
219 }
220 #endif
221
222 err = -ENOMEM;
223 buf.pci_addr = pci_map_single(priv->pdev, buf.mem, frag_len,
224 PCI_DMA_TODEVICE);
225 if (!buf.pci_addr) {
226 printk(KERN_WARNING "%s: cannot map PCI memory for mgmt\n",
227 ndev->name);
228 goto error_free;
229 }
230
231 /* Protect the control block modifications against interrupts. */
232 spin_lock_irqsave(&priv->slock, flags);
233 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ]);
234 if (curr_frag - priv->index_mgmt_tx >= ISL38XX_CB_MGMT_QSIZE) {
235 printk(KERN_WARNING "%s: mgmt tx queue is still full\n",
236 ndev->name);
237 goto error_unlock;
238 }
239
240 /* commit the frame to the tx device queue */
241 index = curr_frag % ISL38XX_CB_MGMT_QSIZE;
242 priv->mgmt_tx[index] = buf;
243 frag = &cb->tx_data_mgmt[index];
244 frag->size = cpu_to_le16(frag_len);
245 frag->flags = 0; /* for any other than the last fragment, set to 1 */
246 frag->address = cpu_to_le32(buf.pci_addr);
247
248 /* The fragment address in the control block must have
249 * been written before announcing the frame buffer to
250 * device */
251 wmb();
252 cb->driver_curr_frag[ISL38XX_CB_TX_MGMTQ] = cpu_to_le32(curr_frag + 1);
253 spin_unlock_irqrestore(&priv->slock, flags);
254
255 /* trigger the device */
256 islpci_trigger(priv);
257 return 0;
258
259 error_unlock:
260 spin_unlock_irqrestore(&priv->slock, flags);
261 error_free:
262 kfree(buf.mem);
263 error:
264 return err;
265 }
266
267 /*
268 * Receive a management frame from the device.
269 * This can be an arbitrary number of traps, and at most one response
270 * frame for a previous request sent via islpci_mgt_transmit().
271 */
272 int
273 islpci_mgt_receive(struct net_device *ndev)
274 {
275 islpci_private *priv = netdev_priv(ndev);
276 isl38xx_control_block *cb =
277 (isl38xx_control_block *) priv->control_block;
278 u32 curr_frag;
279
280 #if VERBOSE > SHOW_ERROR_MESSAGES
281 DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_receive \n");
282 #endif
283
284 /* Only once per interrupt, determine fragment range to
285 * process. This avoids an endless loop (i.e. lockup) if
286 * frames come in faster than we can process them. */
287 curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_RX_MGMTQ]);
288 barrier();
289
290 for (; priv->index_mgmt_rx < curr_frag; priv->index_mgmt_rx++) {
291 pimfor_header_t *header;
292 u32 index = priv->index_mgmt_rx % ISL38XX_CB_MGMT_QSIZE;
293 struct islpci_membuf *buf = &priv->mgmt_rx[index];
294 u16 frag_len;
295 int size;
296 struct islpci_mgmtframe *frame;
297
298 /* I have no idea (and no documentation) if flags != 0
299 * is possible. Drop the frame, reuse the buffer. */
300 if (le16_to_cpu(cb->rx_data_mgmt[index].flags) != 0) {
301 printk(KERN_WARNING "%s: unknown flags 0x%04x\n",
302 ndev->name,
303 le16_to_cpu(cb->rx_data_mgmt[index].flags));
304 continue;
305 }
306
307 /* The device only returns the size of the header(s) here. */
308 frag_len = le16_to_cpu(cb->rx_data_mgmt[index].size);
309
310 /*
311 * We appear to have no way to tell the device the
312 * size of a receive buffer. Thus, if this check
313 * triggers, we likely have kernel heap corruption. */
314 if (frag_len > MGMT_FRAME_SIZE) {
315 printk(KERN_WARNING
316 "%s: Bogus packet size of %d (%#x).\n",
317 ndev->name, frag_len, frag_len);
318 frag_len = MGMT_FRAME_SIZE;
319 }
320
321 /* Ensure the results of device DMA are visible to the CPU. */
322 pci_dma_sync_single_for_cpu(priv->pdev, buf->pci_addr,
323 buf->size, PCI_DMA_FROMDEVICE);
324
325 /* Perform endianess conversion for PIMFOR header in-place. */
326 header = pimfor_decode_header(buf->mem, frag_len);
327 if (!header) {
328 printk(KERN_WARNING "%s: no PIMFOR header found\n",
329 ndev->name);
330 continue;
331 }
332
333 /* The device ID from the PIMFOR packet received from
334 * the MVC is always 0. We forward a sensible device_id.
335 * Not that anyone upstream would care... */
336 header->device_id = priv->ndev->ifindex;
337
338 #if VERBOSE > SHOW_ERROR_MESSAGES
339 DEBUG(SHOW_PIMFOR_FRAMES,
340 "PIMFOR: op %i, oid 0x%08x, device %i, flags 0x%x length 0x%x \n",
341 header->operation, header->oid, header->device_id,
342 header->flags, header->length);
343
344 /* display the buffer contents for debugging */
345 display_buffer((char *) header, PIMFOR_HEADER_SIZE);
346 display_buffer((char *) header + PIMFOR_HEADER_SIZE,
347 header->length);
348 #endif
349
350 /* nobody sends these */
351 if (header->flags & PIMFOR_FLAG_APPLIC_ORIGIN) {
352 printk(KERN_DEBUG
353 "%s: errant PIMFOR application frame\n",
354 ndev->name);
355 continue;
356 }
357
358 /* Determine frame size, skipping OID_INL_TUNNEL headers. */
359 size = PIMFOR_HEADER_SIZE + header->length;
360 frame = kmalloc(sizeof (struct islpci_mgmtframe) + size,
361 GFP_ATOMIC);
362 if (!frame) {
363 printk(KERN_WARNING
364 "%s: Out of memory, cannot handle oid 0x%08x\n",
365 ndev->name, header->oid);
366 continue;
367 }
368 frame->ndev = ndev;
369 memcpy(&frame->buf, header, size);
370 frame->header = (pimfor_header_t *) frame->buf;
371 frame->data = frame->buf + PIMFOR_HEADER_SIZE;
372
373 #if VERBOSE > SHOW_ERROR_MESSAGES
374 DEBUG(SHOW_PIMFOR_FRAMES,
375 "frame: header: %p, data: %p, size: %d\n",
376 frame->header, frame->data, size);
377 #endif
378
379 if (header->operation == PIMFOR_OP_TRAP) {
380 #if VERBOSE > SHOW_ERROR_MESSAGES
381 printk(KERN_DEBUG
382 "TRAP: oid 0x%x, device %i, flags 0x%x length %i\n",
383 header->oid, header->device_id, header->flags,
384 header->length);
385 #endif
386
387 /* Create work to handle trap out of interrupt
388 * context. */
389 INIT_WORK(&frame->ws, prism54_process_trap);
390 schedule_work(&frame->ws);
391
392 } else {
393 /* Signal the one waiting process that a response
394 * has been received. */
395 if ((frame = xchg(&priv->mgmt_received, frame)) != NULL) {
396 printk(KERN_WARNING
397 "%s: mgmt response not collected\n",
398 ndev->name);
399 kfree(frame);
400 }
401 #if VERBOSE > SHOW_ERROR_MESSAGES
402 DEBUG(SHOW_TRACING, "Wake up Mgmt Queue\n");
403 #endif
404 wake_up(&priv->mgmt_wqueue);
405 }
406
407 }
408
409 return 0;
410 }
411
412 /*
413 * Cleanup the transmit queue by freeing all frames handled by the device.
414 */
415 void
416 islpci_mgt_cleanup_transmit(struct net_device *ndev)
417 {
418 islpci_private *priv = netdev_priv(ndev);
419 isl38xx_control_block *cb = /* volatile not needed */
420 (isl38xx_control_block *) priv->control_block;
421 u32 curr_frag;
422
423 #if VERBOSE > SHOW_ERROR_MESSAGES
424 DEBUG(SHOW_FUNCTION_CALLS, "islpci_mgt_cleanup_transmit\n");
425 #endif
426
427 /* Only once per cleanup, determine fragment range to
428 * process. This avoids an endless loop (i.e. lockup) if
429 * the device became confused, incrementing device_curr_frag
430 * rapidly. */
431 curr_frag = le32_to_cpu(cb->device_curr_frag[ISL38XX_CB_TX_MGMTQ]);
432 barrier();
433
434 for (; priv->index_mgmt_tx < curr_frag; priv->index_mgmt_tx++) {
435 int index = priv->index_mgmt_tx % ISL38XX_CB_MGMT_QSIZE;
436 struct islpci_membuf *buf = &priv->mgmt_tx[index];
437 pci_unmap_single(priv->pdev, buf->pci_addr, buf->size,
438 PCI_DMA_TODEVICE);
439 buf->pci_addr = 0;
440 kfree(buf->mem);
441 buf->mem = NULL;
442 buf->size = 0;
443 }
444 }
445
446 /*
447 * Perform one request-response transaction to the device.
448 */
449 int
450 islpci_mgt_transaction(struct net_device *ndev,
451 int operation, unsigned long oid,
452 void *senddata, int sendlen,
453 struct islpci_mgmtframe **recvframe)
454 {
455 islpci_private *priv = netdev_priv(ndev);
456 const long wait_cycle_jiffies = msecs_to_jiffies(ISL38XX_WAIT_CYCLE * 10);
457 long timeout_left = ISL38XX_MAX_WAIT_CYCLES * wait_cycle_jiffies;
458 int err;
459 DEFINE_WAIT(wait);
460
461 *recvframe = NULL;
462
463 if (down_interruptible(&priv->mgmt_sem))
464 return -ERESTARTSYS;
465
466 prepare_to_wait(&priv->mgmt_wqueue, &wait, TASK_UNINTERRUPTIBLE);
467 err = islpci_mgt_transmit(ndev, operation, oid, senddata, sendlen);
468 if (err)
469 goto out;
470
471 err = -ETIMEDOUT;
472 while (timeout_left > 0) {
473 int timeleft;
474 struct islpci_mgmtframe *frame;
475
476 timeleft = schedule_timeout_uninterruptible(wait_cycle_jiffies);
477 frame = xchg(&priv->mgmt_received, NULL);
478 if (frame) {
479 if (frame->header->oid == oid) {
480 *recvframe = frame;
481 err = 0;
482 goto out;
483 } else {
484 printk(KERN_DEBUG
485 "%s: expecting oid 0x%x, received 0x%x.\n",
486 ndev->name, (unsigned int) oid,
487 frame->header->oid);
488 kfree(frame);
489 frame = NULL;
490 }
491 }
492 if (timeleft == 0) {
493 printk(KERN_DEBUG
494 "%s: timeout waiting for mgmt response %lu, "
495 "triggering device\n",
496 ndev->name, timeout_left);
497 islpci_trigger(priv);
498 }
499 timeout_left += timeleft - wait_cycle_jiffies;
500 }
501 printk(KERN_WARNING "%s: timeout waiting for mgmt response\n",
502 ndev->name);
503
504 /* TODO: we should reset the device here */
505 out:
506 finish_wait(&priv->mgmt_wqueue, &wait);
507 up(&priv->mgmt_sem);
508 return err;
509 }
510
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