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[PATCH] prism54: Remove redundant assignment
[linux-2.6/zen-sources.git] / drivers / net / wireless / prism54 / islpci_eth.c
blobfc1eb35648329a5848f4076b5730b8ae48321c7e
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 /* check whether the destination queue has enough fragments for the frame */
101 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
102 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
103 printk(KERN_ERR "%s: transmit device queue full when awake\n",
104 ndev->name);
105 netif_stop_queue(ndev);
106
107 /* trigger the device */
108 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
109 ISL38XX_DEV_INT_REG);
110 udelay(ISL38XX_WRITEIO_DELAY);
111
112 err = -EBUSY;
113 goto drop_free;
114 }
115 /* Check alignment and WDS frame formatting. The start of the packet should
116 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
117 * and add WDS address information */
118 if (likely(((long) skb->data & 0x03) | init_wds)) {
119 /* get the number of bytes to add and re-allign */
120 offset = (4 - (long) skb->data) & 0x03;
121 offset += init_wds ? 6 : 0;
122
123 /* check whether the current skb can be used */
124 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
125 unsigned char *src = skb->data;
126
127 #if VERBOSE > SHOW_ERROR_MESSAGES
128 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
129 init_wds);
130 #endif
131
132 /* align the buffer on 4-byte boundary */
133 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
134 if (init_wds) {
135 /* wds requires an additional address field of 6 bytes */
136 skb_put(skb, 6);
137 #ifdef ISLPCI_ETH_DEBUG
138 printk("islpci_eth_transmit:wds_mac\n");
139 #endif
140 memmove(skb->data + 6, src, skb->len);
141 memcpy(skb->data, wds_mac, 6);
142 } else {
143 memmove(skb->data, src, skb->len);
144 }
145
146 #if VERBOSE > SHOW_ERROR_MESSAGES
147 DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
148 src, skb->len);
149 #endif
150 } else {
151 newskb =
152 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
153 if (unlikely(newskb == NULL)) {
154 printk(KERN_ERR "%s: Cannot allocate skb\n",
155 ndev->name);
156 err = -ENOMEM;
157 goto drop_free;
158 }
159 newskb_offset = (4 - (long) newskb->data) & 0x03;
160
161 /* Check if newskb->data is aligned */
162 if (newskb_offset)
163 skb_reserve(newskb, newskb_offset);
164
165 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
166 if (init_wds) {
167 memcpy(newskb->data + 6, skb->data, skb->len);
168 memcpy(newskb->data, wds_mac, 6);
169 #ifdef ISLPCI_ETH_DEBUG
170 printk("islpci_eth_transmit:wds_mac\n");
171 #endif
172 } else
173 memcpy(newskb->data, skb->data, skb->len);
174
175 #if VERBOSE > SHOW_ERROR_MESSAGES
176 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
177 newskb->data, skb->data, skb->len, init_wds);
178 #endif
179
180 newskb->dev = skb->dev;
181 dev_kfree_skb(skb);
182 skb = newskb;
183 }
184 }
185 /* display the buffer contents for debugging */
186 #if VERBOSE > SHOW_ERROR_MESSAGES
187 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
188 display_buffer((char *) skb->data, skb->len);
189 #endif
190
191 /* map the skb buffer to pci memory for DMA operation */
192 pci_map_address = pci_map_single(priv->pdev,
193 (void *) skb->data, skb->len,
194 PCI_DMA_TODEVICE);
195 if (unlikely(pci_map_address == 0)) {
196 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
197 ndev->name);
198
199 err = -EIO;
200 goto drop_free;
201 }
202 /* Place the fragment in the control block structure. */
203 index = curr_frag % ISL38XX_CB_TX_QSIZE;
204 fragment = &cb->tx_data_low[index];
205
206 priv->pci_map_tx_address[index] = pci_map_address;
207 /* store the skb address for future freeing */
208 priv->data_low_tx[index] = skb;
209 /* set the proper fragment start address and size information */
210 frame_size = skb->len;
211 fragment->size = cpu_to_le16(frame_size);
212 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
213 fragment->address = cpu_to_le32(pci_map_address);
214 curr_frag++;
215
216 /* The fragment address in the control block must have been
217 * written before announcing the frame buffer to device. */
218 wmb();
219 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
220
221 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
222 > ISL38XX_CB_TX_QSIZE) {
223 /* stop sends from upper layers */
224 netif_stop_queue(ndev);
225
226 /* set the full flag for the transmission queue */
227 priv->data_low_tx_full = 1;
228 }
229
230 /* trigger the device */
231 islpci_trigger(priv);
232
233 /* unlock the driver code */
234 spin_unlock_irqrestore(&priv->slock, flags);
235
236 /* set the transmission time */
237 ndev->trans_start = jiffies;
238 priv->statistics.tx_packets++;
239 priv->statistics.tx_bytes += skb->len;
240
241 return 0;
242
243 drop_free:
244 priv->statistics.tx_dropped++;
245 spin_unlock_irqrestore(&priv->slock, flags);
246 dev_kfree_skb(skb);
247 return err;
248 }
249
250 static inline int
251 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
252 {
253 /* The card reports full 802.11 packets but with a 20 bytes
254 * header and without the FCS. But there a is a bit that
255 * indicates if the packet is corrupted :-) */
256 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
257 if (hdr->flags & 0x01)
258 /* This one is bad. Drop it ! */
259 return -1;
260 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
261 struct avs_80211_1_header *avs;
262 /* extract the relevant data from the header */
263 u32 clock = le32_to_cpu(hdr->clock);
264 u8 rate = hdr->rate;
265 u16 freq = le16_to_cpu(hdr->freq);
266 u8 rssi = hdr->rssi;
267
268 skb_pull(*skb, sizeof (struct rfmon_header));
269
270 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
271 struct sk_buff *newskb = skb_copy_expand(*skb,
272 sizeof (struct
273 avs_80211_1_header),
274 0, GFP_ATOMIC);
275 if (newskb) {
276 dev_kfree_skb_irq(*skb);
277 *skb = newskb;
278 } else
279 return -1;
280 /* This behavior is not very subtile... */
281 }
282
283 /* make room for the new header and fill it. */
284 avs =
285 (struct avs_80211_1_header *) skb_push(*skb,
286 sizeof (struct
287 avs_80211_1_header));
288
289 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
290 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
291 avs->mactime = cpu_to_be64(le64_to_cpu(clock));
292 avs->hosttime = cpu_to_be64(jiffies);
293 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
294 avs->channel = cpu_to_be32(channel_of_freq(freq));
295 avs->datarate = cpu_to_be32(rate * 5);
296 avs->antenna = cpu_to_be32(0); /*unknown */
297 avs->priority = cpu_to_be32(0); /*unknown */
298 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
299 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
300 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
301 avs->preamble = cpu_to_be32(0); /*unknown */
302 avs->encoding = cpu_to_be32(0); /*unknown */
303 } else
304 skb_pull(*skb, sizeof (struct rfmon_header));
305
306 (*skb)->protocol = htons(ETH_P_802_2);
307 (*skb)->mac.raw = (*skb)->data;
308 (*skb)->pkt_type = PACKET_OTHERHOST;
309
310 return 0;
311 }
312
313 int
314 islpci_eth_receive(islpci_private *priv)
315 {
316 struct net_device *ndev = priv->ndev;
317 isl38xx_control_block *control_block = priv->control_block;
318 struct sk_buff *skb;
319 u16 size;
320 u32 index, offset;
321 unsigned char *src;
322 int discard = 0;
323
324 #if VERBOSE > SHOW_ERROR_MESSAGES
325 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
326 #endif
327
328 /* the device has written an Ethernet frame in the data area
329 * of the sk_buff without updating the structure, do it now */
330 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
331 size = le16_to_cpu(control_block->rx_data_low[index].size);
332 skb = priv->data_low_rx[index];
333 offset = ((unsigned long)
334 le32_to_cpu(control_block->rx_data_low[index].address) -
335 (unsigned long) skb->data) & 3;
336
337 #if VERBOSE > SHOW_ERROR_MESSAGES
338 DEBUG(SHOW_TRACING,
339 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
340 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
341 skb->len, offset, skb->truesize);
342 #endif
343
344 /* delete the streaming DMA mapping before processing the skb */
345 pci_unmap_single(priv->pdev,
346 priv->pci_map_rx_address[index],
347 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
348
349 /* update the skb structure and allign the buffer */
350 skb_put(skb, size);
351 if (offset) {
352 /* shift the buffer allocation offset bytes to get the right frame */
353 skb_pull(skb, 2);
354 skb_put(skb, 2);
355 }
356 #if VERBOSE > SHOW_ERROR_MESSAGES
357 /* display the buffer contents for debugging */
358 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
359 display_buffer((char *) skb->data, skb->len);
360 #endif
361
362 /* check whether WDS is enabled and whether the data frame is a WDS frame */
363
364 if (init_wds) {
365 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
366 src = skb->data + 6;
367 memmove(skb->data, src, skb->len - 6);
368 skb_trim(skb, skb->len - 6);
369 }
370 #if VERBOSE > SHOW_ERROR_MESSAGES
371 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
372 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
373
374 /* display the buffer contents for debugging */
375 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
376 display_buffer((char *) skb->data, skb->len);
377 #endif
378
379 /* do some additional sk_buff and network layer parameters */
380 skb->dev = ndev;
381
382 /* take care of monitor mode and spy monitoring. */
383 if (unlikely(priv->iw_mode == IW_MODE_MONITOR))
384 discard = islpci_monitor_rx(priv, &skb);
385 else {
386 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
387 /* The packet has a rx_annex. Read it for spy monitoring, Then
388 * remove it, while keeping the 2 leading MAC addr.
389 */
390 struct iw_quality wstats;
391 struct rx_annex_header *annex =
392 (struct rx_annex_header *) skb->data;
393 wstats.level = annex->rfmon.rssi;
394 /* The noise value can be a bit outdated if nobody's
395 * reading wireless stats... */
396 wstats.noise = priv->local_iwstatistics.qual.noise;
397 wstats.qual = wstats.level - wstats.noise;
398 wstats.updated = 0x07;
399 /* Update spy records */
400 wireless_spy_update(ndev, annex->addr2, &wstats);
401
402 memcpy(skb->data + sizeof (struct rfmon_header),
403 skb->data, 2 * ETH_ALEN);
404 skb_pull(skb, sizeof (struct rfmon_header));
405 }
406 skb->protocol = eth_type_trans(skb, ndev);
407 }
408 skb->ip_summed = CHECKSUM_NONE;
409 priv->statistics.rx_packets++;
410 priv->statistics.rx_bytes += size;
411
412 /* deliver the skb to the network layer */
413 #ifdef ISLPCI_ETH_DEBUG
414 printk
415 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
416 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
417 skb->data[4], skb->data[5]);
418 #endif
419 if (unlikely(discard)) {
420 dev_kfree_skb_irq(skb);
421 skb = NULL;
422 } else
423 netif_rx(skb);
424
425 /* increment the read index for the rx data low queue */
426 priv->free_data_rx++;
427
428 /* add one or more sk_buff structures */
429 while (index =
430 le32_to_cpu(control_block->
431 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
432 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
433 /* allocate an sk_buff for received data frames storage
434 * include any required allignment operations */
435 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
436 if (unlikely(skb == NULL)) {
437 /* error allocating an sk_buff structure elements */
438 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
439 break;
440 }
441 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
442 /* store the new skb structure pointer */
443 index = index % ISL38XX_CB_RX_QSIZE;
444 priv->data_low_rx[index] = skb;
445
446 #if VERBOSE > SHOW_ERROR_MESSAGES
447 DEBUG(SHOW_TRACING,
448 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
449 skb, skb->data, skb->len, index, skb->truesize);
450 #endif
451
452 /* set the streaming DMA mapping for proper PCI bus operation */
453 priv->pci_map_rx_address[index] =
454 pci_map_single(priv->pdev, (void *) skb->data,
455 MAX_FRAGMENT_SIZE_RX + 2,
456 PCI_DMA_FROMDEVICE);
457 if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
458 /* error mapping the buffer to device accessable memory address */
459 DEBUG(SHOW_ERROR_MESSAGES,
460 "Error mapping DMA address\n");
461
462 /* free the skbuf structure before aborting */
463 dev_kfree_skb_irq((struct sk_buff *) skb);
464 skb = NULL;
465 break;
466 }
467 /* update the fragment address */
468 control_block->rx_data_low[index].address = cpu_to_le32((u32)
469 priv->
470 pci_map_rx_address
471 [index]);
472 wmb();
473
474 /* increment the driver read pointer */
475 add_le32p((u32 *) &control_block->
476 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
477 }
478
479 /* trigger the device */
480 islpci_trigger(priv);
481
482 return 0;
483 }
484
485 void
486 islpci_do_reset_and_wake(void *data)
487 {
488 islpci_private *priv = (islpci_private *) data;
489 islpci_reset(priv, 1);
490 netif_wake_queue(priv->ndev);
491 priv->reset_task_pending = 0;
492 }
493
494 void
495 islpci_eth_tx_timeout(struct net_device *ndev)
496 {
497 islpci_private *priv = netdev_priv(ndev);
498 struct net_device_stats *statistics = &priv->statistics;
499
500 /* increment the transmit error counter */
501 statistics->tx_errors++;
502
503 printk(KERN_WARNING "%s: tx_timeout", ndev->name);
504 if (!priv->reset_task_pending) {
505 priv->reset_task_pending = 1;
506 printk(", scheduling a reset");
507 netif_stop_queue(ndev);
508 schedule_work(&priv->reset_task);
509 }
510 printk("\n");
511 }
Stable & featurefull patchset based on Linus's git branch