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, see <http://www.gnu.org/licenses/>.
15 *
16 */
17
18 #include <linux/module.h>
19 #include <linux/gfp.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 #include <asm/byteorder.h>
27
28 #include "prismcompat.h"
29 #include "isl_38xx.h"
30 #include "islpci_eth.h"
31 #include "islpci_mgt.h"
32 #include "oid_mgt.h"
33
34 /******************************************************************************
35 Network Interface functions
36 ******************************************************************************/
37 void
islpci_eth_cleanup_transmit(islpci_private * priv,isl38xx_control_block * control_block)38 islpci_eth_cleanup_transmit(islpci_private *priv,
39 isl38xx_control_block *control_block)
40 {
41 struct sk_buff *skb;
42 u32 index;
43
44 /* compare the control block read pointer with the free pointer */
45 while (priv->free_data_tx !=
46 le32_to_cpu(control_block->
47 device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
48 /* read the index of the first fragment to be freed */
49 index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
50
51 /* check for holes in the arrays caused by multi fragment frames
52 * searching for the last fragment of a frame */
53 if (priv->pci_map_tx_address[index]) {
54 /* entry is the last fragment of a frame
55 * free the skb structure and unmap pci memory */
56 skb = priv->data_low_tx[index];
57
58 #if VERBOSE > SHOW_ERROR_MESSAGES
59 DEBUG(SHOW_TRACING,
60 "cleanup skb %p skb->data %p skb->len %u truesize %u\n",
61 skb, skb->data, skb->len, skb->truesize);
62 #endif
63
64 pci_unmap_single(priv->pdev,
65 priv->pci_map_tx_address[index],
66 skb->len, PCI_DMA_TODEVICE);
67 dev_kfree_skb_irq(skb);
68 skb = NULL;
69 }
70 /* increment the free data low queue pointer */
71 priv->free_data_tx++;
72 }
73 }
74
75 netdev_tx_t
islpci_eth_transmit(struct sk_buff * skb,struct net_device * ndev)76 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
77 {
78 islpci_private *priv = netdev_priv(ndev);
79 isl38xx_control_block *cb = priv->control_block;
80 u32 index;
81 dma_addr_t pci_map_address;
82 int frame_size;
83 isl38xx_fragment *fragment;
84 int offset;
85 struct sk_buff *newskb;
86 int newskb_offset;
87 unsigned long flags;
88 unsigned char wds_mac[6];
89 u32 curr_frag;
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 goto drop_free;
110 }
111 /* Check alignment and WDS frame formatting. The start of the packet should
112 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
113 * and add WDS address information */
114 if (likely(((long) skb->data & 0x03) | init_wds)) {
115 /* get the number of bytes to add and re-align */
116 offset = (4 - (long) skb->data) & 0x03;
117 offset += init_wds ? 6 : 0;
118
119 /* check whether the current skb can be used */
120 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
121 unsigned char *src = skb->data;
122
123 #if VERBOSE > SHOW_ERROR_MESSAGES
124 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
125 init_wds);
126 #endif
127
128 /* align the buffer on 4-byte boundary */
129 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
130 if (init_wds) {
131 /* wds requires an additional address field of 6 bytes */
132 skb_put(skb, 6);
133 #ifdef ISLPCI_ETH_DEBUG
134 printk("islpci_eth_transmit:wds_mac\n");
135 #endif
136 memmove(skb->data + 6, src, skb->len);
137 skb_copy_to_linear_data(skb, wds_mac, 6);
138 } else {
139 memmove(skb->data, src, skb->len);
140 }
141
142 #if VERBOSE > SHOW_ERROR_MESSAGES
143 DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
144 src, skb->len);
145 #endif
146 } else {
147 newskb =
148 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
149 if (unlikely(newskb == NULL)) {
150 printk(KERN_ERR "%s: Cannot allocate skb\n",
151 ndev->name);
152 goto drop_free;
153 }
154 newskb_offset = (4 - (long) newskb->data) & 0x03;
155
156 /* Check if newskb->data is aligned */
157 if (newskb_offset)
158 skb_reserve(newskb, newskb_offset);
159
160 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
161 if (init_wds) {
162 skb_copy_from_linear_data(skb,
163 newskb->data + 6,
164 skb->len);
165 skb_copy_to_linear_data(newskb, wds_mac, 6);
166 #ifdef ISLPCI_ETH_DEBUG
167 printk("islpci_eth_transmit:wds_mac\n");
168 #endif
169 } else
170 skb_copy_from_linear_data(skb, newskb->data,
171 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 (pci_dma_mapping_error(priv->pdev, pci_map_address)) {
194 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
195 ndev->name);
196 goto drop_free;
197 }
198 /* Place the fragment in the control block structure. */
199 index = curr_frag % ISL38XX_CB_TX_QSIZE;
200 fragment = &cb->tx_data_low[index];
201
202 priv->pci_map_tx_address[index] = pci_map_address;
203 /* store the skb address for future freeing */
204 priv->data_low_tx[index] = skb;
205 /* set the proper fragment start address and size information */
206 frame_size = skb->len;
207 fragment->size = cpu_to_le16(frame_size);
208 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
209 fragment->address = cpu_to_le32(pci_map_address);
210 curr_frag++;
211
212 /* The fragment address in the control block must have been
213 * written before announcing the frame buffer to device. */
214 wmb();
215 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
216
217 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
218 > ISL38XX_CB_TX_QSIZE) {
219 /* stop sends from upper layers */
220 netif_stop_queue(ndev);
221
222 /* set the full flag for the transmission queue */
223 priv->data_low_tx_full = 1;
224 }
225
226 ndev->stats.tx_packets++;
227 ndev->stats.tx_bytes += skb->len;
228
229 /* trigger the device */
230 islpci_trigger(priv);
231
232 /* unlock the driver code */
233 spin_unlock_irqrestore(&priv->slock, flags);
234
235 return NETDEV_TX_OK;
236
237 drop_free:
238 ndev->stats.tx_dropped++;
239 spin_unlock_irqrestore(&priv->slock, flags);
240 dev_kfree_skb(skb);
241 return NETDEV_TX_OK;
242 }
243
244 static inline int
islpci_monitor_rx(islpci_private * priv,struct sk_buff ** skb)245 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
246 {
247 /* The card reports full 802.11 packets but with a 20 bytes
248 * header and without the FCS. But there a is a bit that
249 * indicates if the packet is corrupted :-) */
250 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
251
252 if (hdr->flags & 0x01)
253 /* This one is bad. Drop it ! */
254 return -1;
255 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
256 struct avs_80211_1_header *avs;
257 /* extract the relevant data from the header */
258 u32 clock = le32_to_cpu(hdr->clock);
259 u8 rate = hdr->rate;
260 u16 freq = le16_to_cpu(hdr->freq);
261 u8 rssi = hdr->rssi;
262
263 skb_pull(*skb, sizeof (struct rfmon_header));
264
265 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
266 struct sk_buff *newskb = skb_copy_expand(*skb,
267 sizeof (struct
268 avs_80211_1_header),
269 0, GFP_ATOMIC);
270 if (newskb) {
271 dev_kfree_skb_irq(*skb);
272 *skb = newskb;
273 } else
274 return -1;
275 /* This behavior is not very subtile... */
276 }
277
278 /* make room for the new header and fill it. */
279 avs = skb_push(*skb, sizeof(struct avs_80211_1_header));
280
281 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
282 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
283 avs->mactime = cpu_to_be64(clock);
284 avs->hosttime = cpu_to_be64(jiffies);
285 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
286 avs->channel = cpu_to_be32(channel_of_freq(freq));
287 avs->datarate = cpu_to_be32(rate * 5);
288 avs->antenna = cpu_to_be32(0); /*unknown */
289 avs->priority = cpu_to_be32(0); /*unknown */
290 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
291 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
292 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
293 avs->preamble = cpu_to_be32(0); /*unknown */
294 avs->encoding = cpu_to_be32(0); /*unknown */
295 } else
296 skb_pull(*skb, sizeof (struct rfmon_header));
297
298 (*skb)->protocol = htons(ETH_P_802_2);
299 skb_reset_mac_header(*skb);
300 (*skb)->pkt_type = PACKET_OTHERHOST;
301
302 return 0;
303 }
304
305 int
islpci_eth_receive(islpci_private * priv)306 islpci_eth_receive(islpci_private *priv)
307 {
308 struct net_device *ndev = priv->ndev;
309 isl38xx_control_block *control_block = priv->control_block;
310 struct sk_buff *skb;
311 u16 size;
312 u32 index, offset;
313 unsigned char *src;
314 int discard = 0;
315
316 #if VERBOSE > SHOW_ERROR_MESSAGES
317 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
318 #endif
319
320 /* the device has written an Ethernet frame in the data area
321 * of the sk_buff without updating the structure, do it now */
322 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
323 size = le16_to_cpu(control_block->rx_data_low[index].size);
324 skb = priv->data_low_rx[index];
325 offset = ((unsigned long)
326 le32_to_cpu(control_block->rx_data_low[index].address) -
327 (unsigned long) skb->data) & 3;
328
329 #if VERBOSE > SHOW_ERROR_MESSAGES
330 DEBUG(SHOW_TRACING,
331 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n",
332 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
333 skb->len, offset, skb->truesize);
334 #endif
335
336 /* delete the streaming DMA mapping before processing the skb */
337 pci_unmap_single(priv->pdev,
338 priv->pci_map_rx_address[index],
339 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
340
341 /* update the skb structure and align the buffer */
342 skb_put(skb, size);
343 if (offset) {
344 /* shift the buffer allocation offset bytes to get the right frame */
345 skb_pull(skb, 2);
346 skb_put(skb, 2);
347 }
348 #if VERBOSE > SHOW_ERROR_MESSAGES
349 /* display the buffer contents for debugging */
350 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
351 display_buffer((char *) skb->data, skb->len);
352 #endif
353
354 /* check whether WDS is enabled and whether the data frame is a WDS frame */
355
356 if (init_wds) {
357 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
358 src = skb->data + 6;
359 memmove(skb->data, src, skb->len - 6);
360 skb_trim(skb, skb->len - 6);
361 }
362 #if VERBOSE > SHOW_ERROR_MESSAGES
363 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
364 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
365
366 /* display the buffer contents for debugging */
367 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
368 display_buffer((char *) skb->data, skb->len);
369 #endif
370 /* take care of monitor mode and spy monitoring. */
371 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
372 skb->dev = ndev;
373 discard = islpci_monitor_rx(priv, &skb);
374 } else {
375 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
376 /* The packet has a rx_annex. Read it for spy monitoring, Then
377 * remove it, while keeping the 2 leading MAC addr.
378 */
379 struct iw_quality wstats;
380 struct rx_annex_header *annex =
381 (struct rx_annex_header *) skb->data;
382 wstats.level = annex->rfmon.rssi;
383 /* The noise value can be a bit outdated if nobody's
384 * reading wireless stats... */
385 wstats.noise = priv->local_iwstatistics.qual.noise;
386 wstats.qual = wstats.level - wstats.noise;
387 wstats.updated = 0x07;
388 /* Update spy records */
389 wireless_spy_update(ndev, annex->addr2, &wstats);
390
391 skb_copy_from_linear_data(skb,
392 (skb->data +
393 sizeof(struct rfmon_header)),
394 2 * ETH_ALEN);
395 skb_pull(skb, sizeof (struct rfmon_header));
396 }
397 skb->protocol = eth_type_trans(skb, ndev);
398 }
399 skb->ip_summed = CHECKSUM_NONE;
400 ndev->stats.rx_packets++;
401 ndev->stats.rx_bytes += size;
402
403 /* deliver the skb to the network layer */
404 #ifdef ISLPCI_ETH_DEBUG
405 printk
406 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
407 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
408 skb->data[4], skb->data[5]);
409 #endif
410 if (unlikely(discard)) {
411 dev_kfree_skb_irq(skb);
412 skb = NULL;
413 } else
414 netif_rx(skb);
415
416 /* increment the read index for the rx data low queue */
417 priv->free_data_rx++;
418
419 /* add one or more sk_buff structures */
420 while (index =
421 le32_to_cpu(control_block->
422 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
423 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
424 /* allocate an sk_buff for received data frames storage
425 * include any required allignment operations */
426 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
427 if (unlikely(skb == NULL)) {
428 /* error allocating an sk_buff structure elements */
429 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
430 break;
431 }
432 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
433 /* store the new skb structure pointer */
434 index = index % ISL38XX_CB_RX_QSIZE;
435 priv->data_low_rx[index] = skb;
436
437 #if VERBOSE > SHOW_ERROR_MESSAGES
438 DEBUG(SHOW_TRACING,
439 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n",
440 skb, skb->data, skb->len, index, skb->truesize);
441 #endif
442
443 /* set the streaming DMA mapping for proper PCI bus operation */
444 priv->pci_map_rx_address[index] =
445 pci_map_single(priv->pdev, (void *) skb->data,
446 MAX_FRAGMENT_SIZE_RX + 2,
447 PCI_DMA_FROMDEVICE);
448 if (pci_dma_mapping_error(priv->pdev,
449 priv->pci_map_rx_address[index])) {
450 /* error mapping the buffer to device accessible memory address */
451 DEBUG(SHOW_ERROR_MESSAGES,
452 "Error mapping DMA address\n");
453
454 /* free the skbuf structure before aborting */
455 dev_kfree_skb_irq(skb);
456 skb = NULL;
457 break;
458 }
459 /* update the fragment address */
460 control_block->rx_data_low[index].address =
461 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
462 wmb();
463
464 /* increment the driver read pointer */
465 le32_add_cpu(&control_block->
466 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
467 }
468
469 /* trigger the device */
470 islpci_trigger(priv);
471
472 return 0;
473 }
474
475 void
islpci_do_reset_and_wake(struct work_struct * work)476 islpci_do_reset_and_wake(struct work_struct *work)
477 {
478 islpci_private *priv = container_of(work, islpci_private, reset_task);
479
480 islpci_reset(priv, 1);
481 priv->reset_task_pending = 0;
482 smp_wmb();
483 netif_wake_queue(priv->ndev);
484 }
485
486 void
islpci_eth_tx_timeout(struct net_device * ndev)487 islpci_eth_tx_timeout(struct net_device *ndev)
488 {
489 islpci_private *priv = netdev_priv(ndev);
490
491 /* increment the transmit error counter */
492 ndev->stats.tx_errors++;
493
494 if (!priv->reset_task_pending) {
495 printk(KERN_WARNING
496 "%s: tx_timeout, scheduling reset", ndev->name);
497 netif_stop_queue(ndev);
498 priv->reset_task_pending = 1;
499 schedule_work(&priv->reset_task);
500 } else {
501 printk(KERN_WARNING
502 "%s: tx_timeout, waiting for reset", ndev->name);
503 }
504 }
505