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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / net / wireless / prism54 / islpci_eth.c
blobb1122912ee2d25dcaffe7024bd78c00b5bcc6b75
1 /*
2 * Copyright (C) 2002 Intersil Americas Inc.
3 * Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 */
18
19 #include <linux/module.h>
20
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/if_arp.h>
26
27 #include "prismcompat.h"
28 #include "isl_38xx.h"
29 #include "islpci_eth.h"
30 #include "islpci_mgt.h"
31 #include "oid_mgt.h"
32
33 /******************************************************************************
34 Network Interface functions
35 ******************************************************************************/
36 void
37 islpci_eth_cleanup_transmit(islpci_private *priv,
38 isl38xx_control_block *control_block)
39 {
40 struct sk_buff *skb;
41 u32 index;
42
43 /* compare the control block read pointer with the free pointer */
44 while (priv->free_data_tx !=
45 le32_to_cpu(control_block->
46 device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
47 /* read the index of the first fragment to be freed */
48 index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
49
50 /* check for holes in the arrays caused by multi fragment frames
51 * searching for the last fragment of a frame */
52 if (priv->pci_map_tx_address[index] != (dma_addr_t) NULL) {
53 /* entry is the last fragment of a frame
54 * free the skb structure and unmap pci memory */
55 skb = priv->data_low_tx[index];
56
57 #if VERBOSE > SHOW_ERROR_MESSAGES
58 DEBUG(SHOW_TRACING,
59 "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
60 skb, skb->data, skb->len, skb->truesize);
61 #endif
62
63 pci_unmap_single(priv->pdev,
64 priv->pci_map_tx_address[index],
65 skb->len, PCI_DMA_TODEVICE);
66 dev_kfree_skb_irq(skb);
67 skb = NULL;
68 }
69 /* increment the free data low queue pointer */
70 priv->free_data_tx++;
71 }
72 }
73
74 int
75 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
76 {
77 islpci_private *priv = netdev_priv(ndev);
78 isl38xx_control_block *cb = priv->control_block;
79 u32 index;
80 dma_addr_t pci_map_address;
81 int frame_size;
82 isl38xx_fragment *fragment;
83 int offset;
84 struct sk_buff *newskb;
85 int newskb_offset;
86 unsigned long flags;
87 unsigned char wds_mac[6];
88 u32 curr_frag;
89 int err = 0;
90
91 #if VERBOSE > SHOW_ERROR_MESSAGES
92 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
93 #endif
94
95 /* lock the driver code */
96 spin_lock_irqsave(&priv->slock, flags);
97
98 /* check whether the destination queue has enough fragments for the frame */
99 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
100 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
101 printk(KERN_ERR "%s: transmit device queue full when awake\n",
102 ndev->name);
103 netif_stop_queue(ndev);
104
105 /* trigger the device */
106 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
107 ISL38XX_DEV_INT_REG);
108 udelay(ISL38XX_WRITEIO_DELAY);
109
110 err = -EBUSY;
111 goto drop_free;
112 }
113 /* Check alignment and WDS frame formatting. The start of the packet should
114 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
115 * and add WDS address information */
116 if (likely(((long) skb->data & 0x03) | init_wds)) {
117 /* get the number of bytes to add and re-allign */
118 offset = (4 - (long) skb->data) & 0x03;
119 offset += init_wds ? 6 : 0;
120
121 /* check whether the current skb can be used */
122 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
123 unsigned char *src = skb->data;
124
125 #if VERBOSE > SHOW_ERROR_MESSAGES
126 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
127 init_wds);
128 #endif
129
130 /* align the buffer on 4-byte boundary */
131 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
132 if (init_wds) {
133 /* wds requires an additional address field of 6 bytes */
134 skb_put(skb, 6);
135 #ifdef ISLPCI_ETH_DEBUG
136 printk("islpci_eth_transmit:wds_mac\n");
137 #endif
138 memmove(skb->data + 6, src, skb->len);
139 memcpy(skb->data, wds_mac, 6);
140 } else {
141 memmove(skb->data, src, skb->len);
142 }
143
144 #if VERBOSE > SHOW_ERROR_MESSAGES
145 DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
146 src, skb->len);
147 #endif
148 } else {
149 newskb =
150 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
151 if (unlikely(newskb == NULL)) {
152 printk(KERN_ERR "%s: Cannot allocate skb\n",
153 ndev->name);
154 err = -ENOMEM;
155 goto drop_free;
156 }
157 newskb_offset = (4 - (long) newskb->data) & 0x03;
158
159 /* Check if newskb->data is aligned */
160 if (newskb_offset)
161 skb_reserve(newskb, newskb_offset);
162
163 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
164 if (init_wds) {
165 memcpy(newskb->data + 6, skb->data, skb->len);
166 memcpy(newskb->data, wds_mac, 6);
167 #ifdef ISLPCI_ETH_DEBUG
168 printk("islpci_eth_transmit:wds_mac\n");
169 #endif
170 } else
171 memcpy(newskb->data, skb->data, skb->len);
172
173 #if VERBOSE > SHOW_ERROR_MESSAGES
174 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
175 newskb->data, skb->data, skb->len, init_wds);
176 #endif
177
178 newskb->dev = skb->dev;
179 dev_kfree_skb_irq(skb);
180 skb = newskb;
181 }
182 }
183 /* display the buffer contents for debugging */
184 #if VERBOSE > SHOW_ERROR_MESSAGES
185 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
186 display_buffer((char *) skb->data, skb->len);
187 #endif
188
189 /* map the skb buffer to pci memory for DMA operation */
190 pci_map_address = pci_map_single(priv->pdev,
191 (void *) skb->data, skb->len,
192 PCI_DMA_TODEVICE);
193 if (unlikely(pci_map_address == 0)) {
194 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
195 ndev->name);
196
197 err = -EIO;
198 goto drop_free;
199 }
200 /* Place the fragment in the control block structure. */
201 index = curr_frag % ISL38XX_CB_TX_QSIZE;
202 fragment = &cb->tx_data_low[index];
203
204 priv->pci_map_tx_address[index] = pci_map_address;
205 /* store the skb address for future freeing */
206 priv->data_low_tx[index] = skb;
207 /* set the proper fragment start address and size information */
208 frame_size = skb->len;
209 fragment->size = cpu_to_le16(frame_size);
210 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
211 fragment->address = cpu_to_le32(pci_map_address);
212 curr_frag++;
213
214 /* The fragment address in the control block must have been
215 * written before announcing the frame buffer to device. */
216 wmb();
217 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
218
219 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
220 > ISL38XX_CB_TX_QSIZE) {
221 /* stop sends from upper layers */
222 netif_stop_queue(ndev);
223
224 /* set the full flag for the transmission queue */
225 priv->data_low_tx_full = 1;
226 }
227
228 /* set the transmission time */
229 ndev->trans_start = jiffies;
230 priv->statistics.tx_packets++;
231 priv->statistics.tx_bytes += skb->len;
232
233 /* trigger the device */
234 islpci_trigger(priv);
235
236 /* unlock the driver code */
237 spin_unlock_irqrestore(&priv->slock, flags);
238
239 return 0;
240
241 drop_free:
242 priv->statistics.tx_dropped++;
243 spin_unlock_irqrestore(&priv->slock, flags);
244 dev_kfree_skb(skb);
245 return err;
246 }
247
248 static inline int
249 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
250 {
251 /* The card reports full 802.11 packets but with a 20 bytes
252 * header and without the FCS. But there a is a bit that
253 * indicates if the packet is corrupted :-) */
254 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
255
256 if (hdr->flags & 0x01)
257 /* This one is bad. Drop it ! */
258 return -1;
259 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
260 struct avs_80211_1_header *avs;
261 /* extract the relevant data from the header */
262 u32 clock = le32_to_cpu(hdr->clock);
263 u8 rate = hdr->rate;
264 u16 freq = le16_to_cpu(hdr->freq);
265 u8 rssi = hdr->rssi;
266
267 skb_pull(*skb, sizeof (struct rfmon_header));
268
269 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
270 struct sk_buff *newskb = skb_copy_expand(*skb,
271 sizeof (struct
272 avs_80211_1_header),
273 0, GFP_ATOMIC);
274 if (newskb) {
275 dev_kfree_skb_irq(*skb);
276 *skb = newskb;
277 } else
278 return -1;
279 /* This behavior is not very subtile... */
280 }
281
282 /* make room for the new header and fill it. */
283 avs =
284 (struct avs_80211_1_header *) skb_push(*skb,
285 sizeof (struct
286 avs_80211_1_header));
287
288 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
289 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
290 avs->mactime = cpu_to_be64(le64_to_cpu(clock));
291 avs->hosttime = cpu_to_be64(jiffies);
292 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
293 avs->channel = cpu_to_be32(channel_of_freq(freq));
294 avs->datarate = cpu_to_be32(rate * 5);
295 avs->antenna = cpu_to_be32(0); /*unknown */
296 avs->priority = cpu_to_be32(0); /*unknown */
297 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
298 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
299 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
300 avs->preamble = cpu_to_be32(0); /*unknown */
301 avs->encoding = cpu_to_be32(0); /*unknown */
302 } else
303 skb_pull(*skb, sizeof (struct rfmon_header));
304
305 (*skb)->protocol = htons(ETH_P_802_2);
306 (*skb)->mac.raw = (*skb)->data;
307 (*skb)->pkt_type = PACKET_OTHERHOST;
308
309 return 0;
310 }
311
312 int
313 islpci_eth_receive(islpci_private *priv)
314 {
315 struct net_device *ndev = priv->ndev;
316 isl38xx_control_block *control_block = priv->control_block;
317 struct sk_buff *skb;
318 u16 size;
319 u32 index, offset;
320 unsigned char *src;
321 int discard = 0;
322
323 #if VERBOSE > SHOW_ERROR_MESSAGES
324 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
325 #endif
326
327 /* the device has written an Ethernet frame in the data area
328 * of the sk_buff without updating the structure, do it now */
329 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
330 size = le16_to_cpu(control_block->rx_data_low[index].size);
331 skb = priv->data_low_rx[index];
332 offset = ((unsigned long)
333 le32_to_cpu(control_block->rx_data_low[index].address) -
334 (unsigned long) skb->data) & 3;
335
336 #if VERBOSE > SHOW_ERROR_MESSAGES
337 DEBUG(SHOW_TRACING,
338 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
339 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
340 skb->len, offset, skb->truesize);
341 #endif
342
343 /* delete the streaming DMA mapping before processing the skb */
344 pci_unmap_single(priv->pdev,
345 priv->pci_map_rx_address[index],
346 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
347
348 /* update the skb structure and allign the buffer */
349 skb_put(skb, size);
350 if (offset) {
351 /* shift the buffer allocation offset bytes to get the right frame */
352 skb_pull(skb, 2);
353 skb_put(skb, 2);
354 }
355 #if VERBOSE > SHOW_ERROR_MESSAGES
356 /* display the buffer contents for debugging */
357 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
358 display_buffer((char *) skb->data, skb->len);
359 #endif
360
361 /* check whether WDS is enabled and whether the data frame is a WDS frame */
362
363 if (init_wds) {
364 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
365 src = skb->data + 6;
366 memmove(skb->data, src, skb->len - 6);
367 skb_trim(skb, skb->len - 6);
368 }
369 #if VERBOSE > SHOW_ERROR_MESSAGES
370 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
371 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
372
373 /* display the buffer contents for debugging */
374 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
375 display_buffer((char *) skb->data, skb->len);
376 #endif
377
378 /* do some additional sk_buff and network layer parameters */
379 skb->dev = ndev;
380
381 /* take care of monitor mode and spy monitoring. */
382 if (unlikely(priv->iw_mode == IW_MODE_MONITOR))
383 discard = islpci_monitor_rx(priv, &skb);
384 else {
385 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
386 /* The packet has a rx_annex. Read it for spy monitoring, Then
387 * remove it, while keeping the 2 leading MAC addr.
388 */
389 struct iw_quality wstats;
390 struct rx_annex_header *annex =
391 (struct rx_annex_header *) skb->data;
392 wstats.level = annex->rfmon.rssi;
393 /* The noise value can be a bit outdated if nobody's
394 * reading wireless stats... */
395 wstats.noise = priv->local_iwstatistics.qual.noise;
396 wstats.qual = wstats.level - wstats.noise;
397 wstats.updated = 0x07;
398 /* Update spy records */
399 wireless_spy_update(ndev, annex->addr2, &wstats);
400
401 memcpy(skb->data + sizeof (struct rfmon_header),
402 skb->data, 2 * ETH_ALEN);
403 skb_pull(skb, sizeof (struct rfmon_header));
404 }
405 skb->protocol = eth_type_trans(skb, ndev);
406 }
407 skb->ip_summed = CHECKSUM_NONE;
408 priv->statistics.rx_packets++;
409 priv->statistics.rx_bytes += size;
410
411 /* deliver the skb to the network layer */
412 #ifdef ISLPCI_ETH_DEBUG
413 printk
414 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
415 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
416 skb->data[4], skb->data[5]);
417 #endif
418 if (unlikely(discard)) {
419 dev_kfree_skb_irq(skb);
420 skb = NULL;
421 } else
422 netif_rx(skb);
423
424 /* increment the read index for the rx data low queue */
425 priv->free_data_rx++;
426
427 /* add one or more sk_buff structures */
428 while (index =
429 le32_to_cpu(control_block->
430 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
431 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
432 /* allocate an sk_buff for received data frames storage
433 * include any required allignment operations */
434 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
435 if (unlikely(skb == NULL)) {
436 /* error allocating an sk_buff structure elements */
437 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
438 break;
439 }
440 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
441 /* store the new skb structure pointer */
442 index = index % ISL38XX_CB_RX_QSIZE;
443 priv->data_low_rx[index] = skb;
444
445 #if VERBOSE > SHOW_ERROR_MESSAGES
446 DEBUG(SHOW_TRACING,
447 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
448 skb, skb->data, skb->len, index, skb->truesize);
449 #endif
450
451 /* set the streaming DMA mapping for proper PCI bus operation */
452 priv->pci_map_rx_address[index] =
453 pci_map_single(priv->pdev, (void *) skb->data,
454 MAX_FRAGMENT_SIZE_RX + 2,
455 PCI_DMA_FROMDEVICE);
456 if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
457 /* error mapping the buffer to device accessable memory address */
458 DEBUG(SHOW_ERROR_MESSAGES,
459 "Error mapping DMA address\n");
460
461 /* free the skbuf structure before aborting */
462 dev_kfree_skb_irq((struct sk_buff *) skb);
463 skb = NULL;
464 break;
465 }
466 /* update the fragment address */
467 control_block->rx_data_low[index].address =
468 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
469 wmb();
470
471 /* increment the driver read pointer */
472 add_le32p((u32 *) &control_block->
473 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
474 }
475
476 /* trigger the device */
477 islpci_trigger(priv);
478
479 return 0;
480 }
481
482 void
483 islpci_do_reset_and_wake(struct work_struct *work)
484 {
485 islpci_private *priv = container_of(work, islpci_private, reset_task);
486
487 islpci_reset(priv, 1);
488 priv->reset_task_pending = 0;
489 smp_wmb();
490 netif_wake_queue(priv->ndev);
491 }
492
493 void
494 islpci_eth_tx_timeout(struct net_device *ndev)
495 {
496 islpci_private *priv = netdev_priv(ndev);
497 struct net_device_stats *statistics = &priv->statistics;
498
499 /* increment the transmit error counter */
500 statistics->tx_errors++;
501
502 if (!priv->reset_task_pending) {
503 printk(KERN_WARNING
504 "%s: tx_timeout, scheduling reset", ndev->name);
505 netif_stop_queue(ndev);
506 priv->reset_task_pending = 1;
507 schedule_work(&priv->reset_task);
508 } else {
509 printk(KERN_WARNING
510 "%s: tx_timeout, waiting for reset", ndev->name);
511 }
512 }
Linux with added FPC-III support