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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / prism54 / islpci_eth.c
blob5952e99604991451650165bae75f1bb3227c6657
1 /*
2 *
3 * Copyright (C) 2002 Intersil Americas Inc.
4 * Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
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/version.h>
21 #include <linux/module.h>
22
23 #include <linux/pci.h>
24 #include <linux/delay.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/if_arp.h>
28
29 #include "prismcompat.h"
30 #include "isl_38xx.h"
31 #include "islpci_eth.h"
32 #include "islpci_mgt.h"
33 #include "oid_mgt.h"
34
35 /******************************************************************************
36 Network Interface functions
37 ******************************************************************************/
38 void
39 islpci_eth_cleanup_transmit(islpci_private *priv,
40 isl38xx_control_block *control_block)
41 {
42 struct sk_buff *skb;
43 u32 index;
44
45 /* compare the control block read pointer with the free pointer */
46 while (priv->free_data_tx !=
47 le32_to_cpu(control_block->
48 device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
49 /* read the index of the first fragment to be freed */
50 index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
51
52 /* check for holes in the arrays caused by multi fragment frames
53 * searching for the last fragment of a frame */
54 if (priv->pci_map_tx_address[index] != (dma_addr_t) NULL) {
55 /* entry is the last fragment of a frame
56 * free the skb structure and unmap pci memory */
57 skb = priv->data_low_tx[index];
58
59 #if VERBOSE > SHOW_ERROR_MESSAGES
60 DEBUG(SHOW_TRACING,
61 "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
62 skb, skb->data, skb->len, skb->truesize);
63 #endif
64
65 pci_unmap_single(priv->pdev,
66 priv->pci_map_tx_address[index],
67 skb->len, PCI_DMA_TODEVICE);
68 dev_kfree_skb_irq(skb);
69 skb = NULL;
70 }
71 /* increment the free data low queue pointer */
72 priv->free_data_tx++;
73 }
74 }
75
76 int
77 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
78 {
79 islpci_private *priv = netdev_priv(ndev);
80 isl38xx_control_block *cb = priv->control_block;
81 u32 index;
82 dma_addr_t pci_map_address;
83 int frame_size;
84 isl38xx_fragment *fragment;
85 int offset;
86 struct sk_buff *newskb;
87 int newskb_offset;
88 unsigned long flags;
89 unsigned char wds_mac[6];
90 u32 curr_frag;
91 int err = 0;
92
93 #if VERBOSE > SHOW_ERROR_MESSAGES
94 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
95 #endif
96
97 /* lock the driver code */
98 spin_lock_irqsave(&priv->slock, flags);
99
100 /* determine the amount of fragments needed to store the frame */
101
102 frame_size = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
103 if (init_wds)
104 frame_size += 6;
105
106 /* check whether the destination queue has enough fragments for the frame */
107 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
108 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
109 printk(KERN_ERR "%s: transmit device queue full when awake\n",
110 ndev->name);
111 netif_stop_queue(ndev);
112
113 /* trigger the device */
114 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
115 ISL38XX_DEV_INT_REG);
116 udelay(ISL38XX_WRITEIO_DELAY);
117
118 err = -EBUSY;
119 goto drop_free;
120 }
121 /* Check alignment and WDS frame formatting. The start of the packet should
122 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
123 * and add WDS address information */
124 if (likely(((long) skb->data & 0x03) | init_wds)) {
125 /* get the number of bytes to add and re-allign */
126 offset = (4 - (long) skb->data) & 0x03;
127 offset += init_wds ? 6 : 0;
128
129 /* check whether the current skb can be used */
130 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
131 unsigned char *src = skb->data;
132
133 #if VERBOSE > SHOW_ERROR_MESSAGES
134 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
135 init_wds);
136 #endif
137
138 /* align the buffer on 4-byte boundary */
139 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
140 if (init_wds) {
141 /* wds requires an additional address field of 6 bytes */
142 skb_put(skb, 6);
143 #ifdef ISLPCI_ETH_DEBUG
144 printk("islpci_eth_transmit:wds_mac\n");
145 #endif
146 memmove(skb->data + 6, src, skb->len);
147 memcpy(skb->data, wds_mac, 6);
148 } else {
149 memmove(skb->data, src, skb->len);
150 }
151
152 #if VERBOSE > SHOW_ERROR_MESSAGES
153 DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
154 src, skb->len);
155 #endif
156 } else {
157 newskb =
158 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
159 if (unlikely(newskb == NULL)) {
160 printk(KERN_ERR "%s: Cannot allocate skb\n",
161 ndev->name);
162 err = -ENOMEM;
163 goto drop_free;
164 }
165 newskb_offset = (4 - (long) newskb->data) & 0x03;
166
167 /* Check if newskb->data is aligned */
168 if (newskb_offset)
169 skb_reserve(newskb, newskb_offset);
170
171 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
172 if (init_wds) {
173 memcpy(newskb->data + 6, skb->data, skb->len);
174 memcpy(newskb->data, wds_mac, 6);
175 #ifdef ISLPCI_ETH_DEBUG
176 printk("islpci_eth_transmit:wds_mac\n");
177 #endif
178 } else
179 memcpy(newskb->data, skb->data, skb->len);
180
181 #if VERBOSE > SHOW_ERROR_MESSAGES
182 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
183 newskb->data, skb->data, skb->len, init_wds);
184 #endif
185
186 newskb->dev = skb->dev;
187 dev_kfree_skb(skb);
188 skb = newskb;
189 }
190 }
191 /* display the buffer contents for debugging */
192 #if VERBOSE > SHOW_ERROR_MESSAGES
193 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
194 display_buffer((char *) skb->data, skb->len);
195 #endif
196
197 /* map the skb buffer to pci memory for DMA operation */
198 pci_map_address = pci_map_single(priv->pdev,
199 (void *) skb->data, skb->len,
200 PCI_DMA_TODEVICE);
201 if (unlikely(pci_map_address == 0)) {
202 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
203 ndev->name);
204
205 err = -EIO;
206 goto drop_free;
207 }
208 /* Place the fragment in the control block structure. */
209 index = curr_frag % ISL38XX_CB_TX_QSIZE;
210 fragment = &cb->tx_data_low[index];
211
212 priv->pci_map_tx_address[index] = pci_map_address;
213 /* store the skb address for future freeing */
214 priv->data_low_tx[index] = skb;
215 /* set the proper fragment start address and size information */
216 fragment->size = cpu_to_le16(frame_size);
217 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
218 fragment->address = cpu_to_le32(pci_map_address);
219 curr_frag++;
220
221 /* The fragment address in the control block must have been
222 * written before announcing the frame buffer to device. */
223 wmb();
224 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
225
226 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
227 > ISL38XX_CB_TX_QSIZE) {
228 /* stop sends from upper layers */
229 netif_stop_queue(ndev);
230
231 /* set the full flag for the transmission queue */
232 priv->data_low_tx_full = 1;
233 }
234
235 /* trigger the device */
236 islpci_trigger(priv);
237
238 /* unlock the driver code */
239 spin_unlock_irqrestore(&priv->slock, flags);
240
241 /* set the transmission time */
242 ndev->trans_start = jiffies;
243 priv->statistics.tx_packets++;
244 priv->statistics.tx_bytes += skb->len;
245
246 return 0;
247
248 drop_free:
249 /* free the skbuf structure before aborting */
250 dev_kfree_skb(skb);
251 skb = NULL;
252
253 priv->statistics.tx_dropped++;
254 spin_unlock_irqrestore(&priv->slock, flags);
255 return err;
256 }
257
258 static inline int
259 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
260 {
261 /* The card reports full 802.11 packets but with a 20 bytes
262 * header and without the FCS. But there a is a bit that
263 * indicates if the packet is corrupted :-) */
264 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
265 if (hdr->flags & 0x01)
266 /* This one is bad. Drop it ! */
267 return -1;
268 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
269 struct avs_80211_1_header *avs;
270 /* extract the relevant data from the header */
271 u32 clock = le32_to_cpu(hdr->clock);
272 u8 rate = hdr->rate;
273 u16 freq = le16_to_cpu(hdr->freq);
274 u8 rssi = hdr->rssi;
275
276 skb_pull(*skb, sizeof (struct rfmon_header));
277
278 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
279 struct sk_buff *newskb = skb_copy_expand(*skb,
280 sizeof (struct
281 avs_80211_1_header),
282 0, GFP_ATOMIC);
283 if (newskb) {
284 dev_kfree_skb_irq(*skb);
285 *skb = newskb;
286 } else
287 return -1;
288 /* This behavior is not very subtile... */
289 }
290
291 /* make room for the new header and fill it. */
292 avs =
293 (struct avs_80211_1_header *) skb_push(*skb,
294 sizeof (struct
295 avs_80211_1_header));
296
297 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
298 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
299 avs->mactime = cpu_to_be64(le64_to_cpu(clock));
300 avs->hosttime = cpu_to_be64(jiffies);
301 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
302 avs->channel = cpu_to_be32(channel_of_freq(freq));
303 avs->datarate = cpu_to_be32(rate * 5);
304 avs->antenna = cpu_to_be32(0); /*unknown */
305 avs->priority = cpu_to_be32(0); /*unknown */
306 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
307 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
308 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
309 avs->preamble = cpu_to_be32(0); /*unknown */
310 avs->encoding = cpu_to_be32(0); /*unknown */
311 } else
312 skb_pull(*skb, sizeof (struct rfmon_header));
313
314 (*skb)->protocol = htons(ETH_P_802_2);
315 (*skb)->mac.raw = (*skb)->data;
316 (*skb)->pkt_type = PACKET_OTHERHOST;
317
318 return 0;
319 }
320
321 int
322 islpci_eth_receive(islpci_private *priv)
323 {
324 struct net_device *ndev = priv->ndev;
325 isl38xx_control_block *control_block = priv->control_block;
326 struct sk_buff *skb;
327 u16 size;
328 u32 index, offset;
329 unsigned char *src;
330 int discard = 0;
331
332 #if VERBOSE > SHOW_ERROR_MESSAGES
333 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
334 #endif
335
336 /* the device has written an Ethernet frame in the data area
337 * of the sk_buff without updating the structure, do it now */
338 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
339 size = le16_to_cpu(control_block->rx_data_low[index].size);
340 skb = priv->data_low_rx[index];
341 offset = ((unsigned long)
342 le32_to_cpu(control_block->rx_data_low[index].address) -
343 (unsigned long) skb->data) & 3;
344
345 #if VERBOSE > SHOW_ERROR_MESSAGES
346 DEBUG(SHOW_TRACING,
347 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
348 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
349 skb->len, offset, skb->truesize);
350 #endif
351
352 /* delete the streaming DMA mapping before processing the skb */
353 pci_unmap_single(priv->pdev,
354 priv->pci_map_rx_address[index],
355 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
356
357 /* update the skb structure and allign the buffer */
358 skb_put(skb, size);
359 if (offset) {
360 /* shift the buffer allocation offset bytes to get the right frame */
361 skb_pull(skb, 2);
362 skb_put(skb, 2);
363 }
364 #if VERBOSE > SHOW_ERROR_MESSAGES
365 /* display the buffer contents for debugging */
366 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
367 display_buffer((char *) skb->data, skb->len);
368 #endif
369
370 /* check whether WDS is enabled and whether the data frame is a WDS frame */
371
372 if (init_wds) {
373 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
374 src = skb->data + 6;
375 memmove(skb->data, src, skb->len - 6);
376 skb_trim(skb, skb->len - 6);
377 }
378 #if VERBOSE > SHOW_ERROR_MESSAGES
379 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
380 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
381
382 /* display the buffer contents for debugging */
383 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
384 display_buffer((char *) skb->data, skb->len);
385 #endif
386
387 /* do some additional sk_buff and network layer parameters */
388 skb->dev = ndev;
389
390 /* take care of monitor mode and spy monitoring. */
391 if (unlikely(priv->iw_mode == IW_MODE_MONITOR))
392 discard = islpci_monitor_rx(priv, &skb);
393 else {
394 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
395 /* The packet has a rx_annex. Read it for spy monitoring, Then
396 * remove it, while keeping the 2 leading MAC addr.
397 */
398 struct iw_quality wstats;
399 struct rx_annex_header *annex =
400 (struct rx_annex_header *) skb->data;
401 wstats.level = annex->rfmon.rssi;
402 /* The noise value can be a bit outdated if nobody's
403 * reading wireless stats... */
404 wstats.noise = priv->local_iwstatistics.qual.noise;
405 wstats.qual = wstats.level - wstats.noise;
406 wstats.updated = 0x07;
407 /* Update spy records */
408 wireless_spy_update(ndev, annex->addr2, &wstats);
409
410 memcpy(skb->data + sizeof (struct rfmon_header),
411 skb->data, 2 * ETH_ALEN);
412 skb_pull(skb, sizeof (struct rfmon_header));
413 }
414 skb->protocol = eth_type_trans(skb, ndev);
415 }
416 skb->ip_summed = CHECKSUM_NONE;
417 priv->statistics.rx_packets++;
418 priv->statistics.rx_bytes += size;
419
420 /* deliver the skb to the network layer */
421 #ifdef ISLPCI_ETH_DEBUG
422 printk
423 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
424 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
425 skb->data[4], skb->data[5]);
426 #endif
427 if (unlikely(discard)) {
428 dev_kfree_skb_irq(skb);
429 skb = NULL;
430 } else
431 netif_rx(skb);
432
433 /* increment the read index for the rx data low queue */
434 priv->free_data_rx++;
435
436 /* add one or more sk_buff structures */
437 while (index =
438 le32_to_cpu(control_block->
439 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
440 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
441 /* allocate an sk_buff for received data frames storage
442 * include any required allignment operations */
443 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
444 if (unlikely(skb == NULL)) {
445 /* error allocating an sk_buff structure elements */
446 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
447 break;
448 }
449 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
450 /* store the new skb structure pointer */
451 index = index % ISL38XX_CB_RX_QSIZE;
452 priv->data_low_rx[index] = skb;
453
454 #if VERBOSE > SHOW_ERROR_MESSAGES
455 DEBUG(SHOW_TRACING,
456 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
457 skb, skb->data, skb->len, index, skb->truesize);
458 #endif
459
460 /* set the streaming DMA mapping for proper PCI bus operation */
461 priv->pci_map_rx_address[index] =
462 pci_map_single(priv->pdev, (void *) skb->data,
463 MAX_FRAGMENT_SIZE_RX + 2,
464 PCI_DMA_FROMDEVICE);
465 if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
466 /* error mapping the buffer to device accessable memory address */
467 DEBUG(SHOW_ERROR_MESSAGES,
468 "Error mapping DMA address\n");
469
470 /* free the skbuf structure before aborting */
471 dev_kfree_skb_irq((struct sk_buff *) skb);
472 skb = NULL;
473 break;
474 }
475 /* update the fragment address */
476 control_block->rx_data_low[index].address = cpu_to_le32((u32)
477 priv->
478 pci_map_rx_address
479 [index]);
480 wmb();
481
482 /* increment the driver read pointer */
483 add_le32p((u32 *) &control_block->
484 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
485 }
486
487 /* trigger the device */
488 islpci_trigger(priv);
489
490 return 0;
491 }
492
493 void
494 islpci_do_reset_and_wake(void *data)
495 {
496 islpci_private *priv = (islpci_private *) data;
497 islpci_reset(priv, 1);
498 netif_wake_queue(priv->ndev);
499 priv->reset_task_pending = 0;
500 }
501
502 void
503 islpci_eth_tx_timeout(struct net_device *ndev)
504 {
505 islpci_private *priv = netdev_priv(ndev);
506 struct net_device_stats *statistics = &priv->statistics;
507
508 /* increment the transmit error counter */
509 statistics->tx_errors++;
510
511 printk(KERN_WARNING "%s: tx_timeout", ndev->name);
512 if (!priv->reset_task_pending) {
513 priv->reset_task_pending = 1;
514 printk(", scheduling a reset");
515 netif_stop_queue(ndev);
516 schedule_work(&priv->reset_task);
517 }
518 printk("\n");
519 }
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