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
islpci_eth_cleanup_transmit(islpci_private * priv,isl38xx_control_block * control_block)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
islpci_eth_transmit(struct sk_buff * skb,struct net_device * ndev)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 skb_copy_to_linear_data(skb, 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 skb_copy_from_linear_data(skb,
166 newskb->data + 6,
167 skb->len);
168 skb_copy_to_linear_data(newskb, wds_mac, 6);
169 #ifdef ISLPCI_ETH_DEBUG
170 printk("islpci_eth_transmit:wds_mac\n");
171 #endif
172 } else
173 skb_copy_from_linear_data(skb, newskb->data,
174 skb->len);
175
176 #if VERBOSE > SHOW_ERROR_MESSAGES
177 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
178 newskb->data, skb->data, skb->len, init_wds);
179 #endif
180
181 newskb->dev = skb->dev;
182 dev_kfree_skb_irq(skb);
183 skb = newskb;
184 }
185 }
186 /* display the buffer contents for debugging */
187 #if VERBOSE > SHOW_ERROR_MESSAGES
188 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
189 display_buffer((char *) skb->data, skb->len);
190 #endif
191
192 /* map the skb buffer to pci memory for DMA operation */
193 pci_map_address = pci_map_single(priv->pdev,
194 (void *) skb->data, skb->len,
195 PCI_DMA_TODEVICE);
196 if (unlikely(pci_map_address == 0)) {
197 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
198 ndev->name);
199
200 err = -EIO;
201 goto drop_free;
202 }
203 /* Place the fragment in the control block structure. */
204 index = curr_frag % ISL38XX_CB_TX_QSIZE;
205 fragment = &cb->tx_data_low[index];
206
207 priv->pci_map_tx_address[index] = pci_map_address;
208 /* store the skb address for future freeing */
209 priv->data_low_tx[index] = skb;
210 /* set the proper fragment start address and size information */
211 frame_size = skb->len;
212 fragment->size = cpu_to_le16(frame_size);
213 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
214 fragment->address = cpu_to_le32(pci_map_address);
215 curr_frag++;
216
217 /* The fragment address in the control block must have been
218 * written before announcing the frame buffer to device. */
219 wmb();
220 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
221
222 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
223 > ISL38XX_CB_TX_QSIZE) {
224 /* stop sends from upper layers */
225 netif_stop_queue(ndev);
226
227 /* set the full flag for the transmission queue */
228 priv->data_low_tx_full = 1;
229 }
230
231 /* set the transmission time */
232 ndev->trans_start = jiffies;
233 priv->statistics.tx_packets++;
234 priv->statistics.tx_bytes += skb->len;
235
236 /* trigger the device */
237 islpci_trigger(priv);
238
239 /* unlock the driver code */
240 spin_unlock_irqrestore(&priv->slock, flags);
241
242 return 0;
243
244 drop_free:
245 priv->statistics.tx_dropped++;
246 spin_unlock_irqrestore(&priv->slock, flags);
247 dev_kfree_skb(skb);
248 return err;
249 }
250
251 static inline int
islpci_monitor_rx(islpci_private * priv,struct sk_buff ** skb)252 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
253 {
254 /* The card reports full 802.11 packets but with a 20 bytes
255 * header and without the FCS. But there a is a bit that
256 * indicates if the packet is corrupted :-) */
257 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
258
259 if (hdr->flags & 0x01)
260 /* This one is bad. Drop it ! */
261 return -1;
262 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
263 struct avs_80211_1_header *avs;
264 /* extract the relevant data from the header */
265 u32 clock = le32_to_cpu(hdr->clock);
266 u8 rate = hdr->rate;
267 u16 freq = le16_to_cpu(hdr->freq);
268 u8 rssi = hdr->rssi;
269
270 skb_pull(*skb, sizeof (struct rfmon_header));
271
272 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
273 struct sk_buff *newskb = skb_copy_expand(*skb,
274 sizeof (struct
275 avs_80211_1_header),
276 0, GFP_ATOMIC);
277 if (newskb) {
278 dev_kfree_skb_irq(*skb);
279 *skb = newskb;
280 } else
281 return -1;
282 /* This behavior is not very subtile... */
283 }
284
285 /* make room for the new header and fill it. */
286 avs =
287 (struct avs_80211_1_header *) skb_push(*skb,
288 sizeof (struct
289 avs_80211_1_header));
290
291 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
292 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
293 avs->mactime = cpu_to_be64(clock);
294 avs->hosttime = cpu_to_be64(jiffies);
295 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
296 avs->channel = cpu_to_be32(channel_of_freq(freq));
297 avs->datarate = cpu_to_be32(rate * 5);
298 avs->antenna = cpu_to_be32(0); /*unknown */
299 avs->priority = cpu_to_be32(0); /*unknown */
300 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
301 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
302 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
303 avs->preamble = cpu_to_be32(0); /*unknown */
304 avs->encoding = cpu_to_be32(0); /*unknown */
305 } else
306 skb_pull(*skb, sizeof (struct rfmon_header));
307
308 (*skb)->protocol = htons(ETH_P_802_2);
309 skb_reset_mac_header(*skb);
310 (*skb)->pkt_type = PACKET_OTHERHOST;
311
312 return 0;
313 }
314
315 int
islpci_eth_receive(islpci_private * priv)316 islpci_eth_receive(islpci_private *priv)
317 {
318 struct net_device *ndev = priv->ndev;
319 isl38xx_control_block *control_block = priv->control_block;
320 struct sk_buff *skb;
321 u16 size;
322 u32 index, offset;
323 unsigned char *src;
324 int discard = 0;
325
326 #if VERBOSE > SHOW_ERROR_MESSAGES
327 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
328 #endif
329
330 /* the device has written an Ethernet frame in the data area
331 * of the sk_buff without updating the structure, do it now */
332 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
333 size = le16_to_cpu(control_block->rx_data_low[index].size);
334 skb = priv->data_low_rx[index];
335 offset = ((unsigned long)
336 le32_to_cpu(control_block->rx_data_low[index].address) -
337 (unsigned long) skb->data) & 3;
338
339 #if VERBOSE > SHOW_ERROR_MESSAGES
340 DEBUG(SHOW_TRACING,
341 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
342 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
343 skb->len, offset, skb->truesize);
344 #endif
345
346 /* delete the streaming DMA mapping before processing the skb */
347 pci_unmap_single(priv->pdev,
348 priv->pci_map_rx_address[index],
349 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
350
351 /* update the skb structure and allign the buffer */
352 skb_put(skb, size);
353 if (offset) {
354 /* shift the buffer allocation offset bytes to get the right frame */
355 skb_pull(skb, 2);
356 skb_put(skb, 2);
357 }
358 #if VERBOSE > SHOW_ERROR_MESSAGES
359 /* display the buffer contents for debugging */
360 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
361 display_buffer((char *) skb->data, skb->len);
362 #endif
363
364 /* check whether WDS is enabled and whether the data frame is a WDS frame */
365
366 if (init_wds) {
367 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
368 src = skb->data + 6;
369 memmove(skb->data, src, skb->len - 6);
370 skb_trim(skb, skb->len - 6);
371 }
372 #if VERBOSE > SHOW_ERROR_MESSAGES
373 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
374 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
375
376 /* display the buffer contents for debugging */
377 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
378 display_buffer((char *) skb->data, skb->len);
379 #endif
380 /* take care of monitor mode and spy monitoring. */
381 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
382 skb->dev = ndev;
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 skb_copy_from_linear_data(skb,
402 (skb->data +
403 sizeof(struct rfmon_header)),
404 2 * ETH_ALEN);
405 skb_pull(skb, sizeof (struct rfmon_header));
406 }
407 skb->protocol = eth_type_trans(skb, ndev);
408 }
409 skb->ip_summed = CHECKSUM_NONE;
410 priv->statistics.rx_packets++;
411 priv->statistics.rx_bytes += size;
412
413 /* deliver the skb to the network layer */
414 #ifdef ISLPCI_ETH_DEBUG
415 printk
416 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
417 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
418 skb->data[4], skb->data[5]);
419 #endif
420 if (unlikely(discard)) {
421 dev_kfree_skb_irq(skb);
422 skb = NULL;
423 } else
424 netif_rx(skb);
425
426 /* increment the read index for the rx data low queue */
427 priv->free_data_rx++;
428
429 /* add one or more sk_buff structures */
430 while (index =
431 le32_to_cpu(control_block->
432 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
433 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
434 /* allocate an sk_buff for received data frames storage
435 * include any required allignment operations */
436 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
437 if (unlikely(skb == NULL)) {
438 /* error allocating an sk_buff structure elements */
439 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
440 break;
441 }
442 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
443 /* store the new skb structure pointer */
444 index = index % ISL38XX_CB_RX_QSIZE;
445 priv->data_low_rx[index] = skb;
446
447 #if VERBOSE > SHOW_ERROR_MESSAGES
448 DEBUG(SHOW_TRACING,
449 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
450 skb, skb->data, skb->len, index, skb->truesize);
451 #endif
452
453 /* set the streaming DMA mapping for proper PCI bus operation */
454 priv->pci_map_rx_address[index] =
455 pci_map_single(priv->pdev, (void *) skb->data,
456 MAX_FRAGMENT_SIZE_RX + 2,
457 PCI_DMA_FROMDEVICE);
458 if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
459 /* error mapping the buffer to device accessable memory address */
460 DEBUG(SHOW_ERROR_MESSAGES,
461 "Error mapping DMA address\n");
462
463 /* free the skbuf structure before aborting */
464 dev_kfree_skb_irq((struct sk_buff *) skb);
465 skb = NULL;
466 break;
467 }
468 /* update the fragment address */
469 control_block->rx_data_low[index].address =
470 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
471 wmb();
472
473 /* increment the driver read pointer */
474 add_le32p(&control_block->
475 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
476 }
477
478 /* trigger the device */
479 islpci_trigger(priv);
480
481 return 0;
482 }
483
484 void
islpci_do_reset_and_wake(struct work_struct * work)485 islpci_do_reset_and_wake(struct work_struct *work)
486 {
487 islpci_private *priv = container_of(work, islpci_private, reset_task);
488
489 islpci_reset(priv, 1);
490 priv->reset_task_pending = 0;
491 smp_wmb();
492 netif_wake_queue(priv->ndev);
493 }
494
495 void
islpci_eth_tx_timeout(struct net_device * ndev)496 islpci_eth_tx_timeout(struct net_device *ndev)
497 {
498 islpci_private *priv = netdev_priv(ndev);
499 struct net_device_stats *statistics = &priv->statistics;
500
501 /* increment the transmit error counter */
502 statistics->tx_errors++;
503
504 if (!priv->reset_task_pending) {
505 printk(KERN_WARNING
506 "%s: tx_timeout, scheduling reset", ndev->name);
507 netif_stop_queue(ndev);
508 priv->reset_task_pending = 1;
509 schedule_work(&priv->reset_task);
510 } else {
511 printk(KERN_WARNING
512 "%s: tx_timeout, waiting for reset", ndev->name);
513 }
514 }
515