1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2002 Intersil Americas Inc.
4 * Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
5 */
6
7 #include <linux/module.h>
8 #include <linux/gfp.h>
9
10 #include <linux/pci.h>
11 #include <linux/delay.h>
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/if_arp.h>
15 #include <asm/byteorder.h>
16
17 #include "prismcompat.h"
18 #include "isl_38xx.h"
19 #include "islpci_eth.h"
20 #include "islpci_mgt.h"
21 #include "oid_mgt.h"
22
23 /******************************************************************************
24 Network Interface functions
25 ******************************************************************************/
26 void
islpci_eth_cleanup_transmit(islpci_private * priv,isl38xx_control_block * control_block)27 islpci_eth_cleanup_transmit(islpci_private *priv,
28 isl38xx_control_block *control_block)
29 {
30 struct sk_buff *skb;
31 u32 index;
32
33 /* compare the control block read pointer with the free pointer */
34 while (priv->free_data_tx !=
35 le32_to_cpu(control_block->
36 device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
37 /* read the index of the first fragment to be freed */
38 index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
39
40 /* check for holes in the arrays caused by multi fragment frames
41 * searching for the last fragment of a frame */
42 if (priv->pci_map_tx_address[index]) {
43 /* entry is the last fragment of a frame
44 * free the skb structure and unmap pci memory */
45 skb = priv->data_low_tx[index];
46
47 #if VERBOSE > SHOW_ERROR_MESSAGES
48 DEBUG(SHOW_TRACING,
49 "cleanup skb %p skb->data %p skb->len %u truesize %u\n",
50 skb, skb->data, skb->len, skb->truesize);
51 #endif
52
53 pci_unmap_single(priv->pdev,
54 priv->pci_map_tx_address[index],
55 skb->len, PCI_DMA_TODEVICE);
56 dev_kfree_skb_irq(skb);
57 skb = NULL;
58 }
59 /* increment the free data low queue pointer */
60 priv->free_data_tx++;
61 }
62 }
63
64 netdev_tx_t
islpci_eth_transmit(struct sk_buff * skb,struct net_device * ndev)65 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
66 {
67 islpci_private *priv = netdev_priv(ndev);
68 isl38xx_control_block *cb = priv->control_block;
69 u32 index;
70 dma_addr_t pci_map_address;
71 int frame_size;
72 isl38xx_fragment *fragment;
73 int offset;
74 struct sk_buff *newskb;
75 int newskb_offset;
76 unsigned long flags;
77 unsigned char wds_mac[6];
78 u32 curr_frag;
79
80 #if VERBOSE > SHOW_ERROR_MESSAGES
81 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit\n");
82 #endif
83
84 /* lock the driver code */
85 spin_lock_irqsave(&priv->slock, flags);
86
87 /* check whether the destination queue has enough fragments for the frame */
88 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
89 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
90 printk(KERN_ERR "%s: transmit device queue full when awake\n",
91 ndev->name);
92 netif_stop_queue(ndev);
93
94 /* trigger the device */
95 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
96 ISL38XX_DEV_INT_REG);
97 udelay(ISL38XX_WRITEIO_DELAY);
98 goto drop_free;
99 }
100 /* Check alignment and WDS frame formatting. The start of the packet should
101 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
102 * and add WDS address information */
103 if (likely(((long) skb->data & 0x03) | init_wds)) {
104 /* get the number of bytes to add and re-align */
105 offset = (4 - (long) skb->data) & 0x03;
106 offset += init_wds ? 6 : 0;
107
108 /* check whether the current skb can be used */
109 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
110 unsigned char *src = skb->data;
111
112 #if VERBOSE > SHOW_ERROR_MESSAGES
113 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
114 init_wds);
115 #endif
116
117 /* align the buffer on 4-byte boundary */
118 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
119 if (init_wds) {
120 /* wds requires an additional address field of 6 bytes */
121 skb_put(skb, 6);
122 #ifdef ISLPCI_ETH_DEBUG
123 printk("islpci_eth_transmit:wds_mac\n");
124 #endif
125 memmove(skb->data + 6, src, skb->len);
126 skb_copy_to_linear_data(skb, wds_mac, 6);
127 } else {
128 memmove(skb->data, src, skb->len);
129 }
130
131 #if VERBOSE > SHOW_ERROR_MESSAGES
132 DEBUG(SHOW_TRACING, "memmove %p %p %i\n", skb->data,
133 src, skb->len);
134 #endif
135 } else {
136 newskb =
137 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
138 if (unlikely(newskb == NULL)) {
139 printk(KERN_ERR "%s: Cannot allocate skb\n",
140 ndev->name);
141 goto drop_free;
142 }
143 newskb_offset = (4 - (long) newskb->data) & 0x03;
144
145 /* Check if newskb->data is aligned */
146 if (newskb_offset)
147 skb_reserve(newskb, newskb_offset);
148
149 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
150 if (init_wds) {
151 skb_copy_from_linear_data(skb,
152 newskb->data + 6,
153 skb->len);
154 skb_copy_to_linear_data(newskb, wds_mac, 6);
155 #ifdef ISLPCI_ETH_DEBUG
156 printk("islpci_eth_transmit:wds_mac\n");
157 #endif
158 } else
159 skb_copy_from_linear_data(skb, newskb->data,
160 skb->len);
161
162 #if VERBOSE > SHOW_ERROR_MESSAGES
163 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
164 newskb->data, skb->data, skb->len, init_wds);
165 #endif
166
167 newskb->dev = skb->dev;
168 dev_kfree_skb_irq(skb);
169 skb = newskb;
170 }
171 }
172 /* display the buffer contents for debugging */
173 #if VERBOSE > SHOW_ERROR_MESSAGES
174 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
175 display_buffer((char *) skb->data, skb->len);
176 #endif
177
178 /* map the skb buffer to pci memory for DMA operation */
179 pci_map_address = pci_map_single(priv->pdev,
180 (void *) skb->data, skb->len,
181 PCI_DMA_TODEVICE);
182 if (pci_dma_mapping_error(priv->pdev, pci_map_address)) {
183 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
184 ndev->name);
185 goto drop_free;
186 }
187 /* Place the fragment in the control block structure. */
188 index = curr_frag % ISL38XX_CB_TX_QSIZE;
189 fragment = &cb->tx_data_low[index];
190
191 priv->pci_map_tx_address[index] = pci_map_address;
192 /* store the skb address for future freeing */
193 priv->data_low_tx[index] = skb;
194 /* set the proper fragment start address and size information */
195 frame_size = skb->len;
196 fragment->size = cpu_to_le16(frame_size);
197 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
198 fragment->address = cpu_to_le32(pci_map_address);
199 curr_frag++;
200
201 /* The fragment address in the control block must have been
202 * written before announcing the frame buffer to device. */
203 wmb();
204 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
205
206 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
207 > ISL38XX_CB_TX_QSIZE) {
208 /* stop sends from upper layers */
209 netif_stop_queue(ndev);
210
211 /* set the full flag for the transmission queue */
212 priv->data_low_tx_full = 1;
213 }
214
215 ndev->stats.tx_packets++;
216 ndev->stats.tx_bytes += skb->len;
217
218 /* trigger the device */
219 islpci_trigger(priv);
220
221 /* unlock the driver code */
222 spin_unlock_irqrestore(&priv->slock, flags);
223
224 return NETDEV_TX_OK;
225
226 drop_free:
227 ndev->stats.tx_dropped++;
228 spin_unlock_irqrestore(&priv->slock, flags);
229 dev_kfree_skb(skb);
230 return NETDEV_TX_OK;
231 }
232
233 static inline int
islpci_monitor_rx(islpci_private * priv,struct sk_buff ** skb)234 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
235 {
236 /* The card reports full 802.11 packets but with a 20 bytes
237 * header and without the FCS. But there a is a bit that
238 * indicates if the packet is corrupted :-) */
239 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
240
241 if (hdr->flags & 0x01)
242 /* This one is bad. Drop it ! */
243 return -1;
244 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
245 struct avs_80211_1_header *avs;
246 /* extract the relevant data from the header */
247 u32 clock = le32_to_cpu(hdr->clock);
248 u8 rate = hdr->rate;
249 u16 freq = le16_to_cpu(hdr->freq);
250 u8 rssi = hdr->rssi;
251
252 skb_pull(*skb, sizeof (struct rfmon_header));
253
254 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
255 struct sk_buff *newskb = skb_copy_expand(*skb,
256 sizeof (struct
257 avs_80211_1_header),
258 0, GFP_ATOMIC);
259 if (newskb) {
260 dev_kfree_skb_irq(*skb);
261 *skb = newskb;
262 } else
263 return -1;
264 /* This behavior is not very subtile... */
265 }
266
267 /* make room for the new header and fill it. */
268 avs = skb_push(*skb, sizeof(struct avs_80211_1_header));
269
270 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
271 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
272 avs->mactime = cpu_to_be64(clock);
273 avs->hosttime = cpu_to_be64(jiffies);
274 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
275 avs->channel = cpu_to_be32(channel_of_freq(freq));
276 avs->datarate = cpu_to_be32(rate * 5);
277 avs->antenna = cpu_to_be32(0); /*unknown */
278 avs->priority = cpu_to_be32(0); /*unknown */
279 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
280 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
281 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
282 avs->preamble = cpu_to_be32(0); /*unknown */
283 avs->encoding = cpu_to_be32(0); /*unknown */
284 } else
285 skb_pull(*skb, sizeof (struct rfmon_header));
286
287 (*skb)->protocol = htons(ETH_P_802_2);
288 skb_reset_mac_header(*skb);
289 (*skb)->pkt_type = PACKET_OTHERHOST;
290
291 return 0;
292 }
293
294 int
islpci_eth_receive(islpci_private * priv)295 islpci_eth_receive(islpci_private *priv)
296 {
297 struct net_device *ndev = priv->ndev;
298 isl38xx_control_block *control_block = priv->control_block;
299 struct sk_buff *skb;
300 u16 size;
301 u32 index, offset;
302 unsigned char *src;
303 int discard = 0;
304
305 #if VERBOSE > SHOW_ERROR_MESSAGES
306 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
307 #endif
308
309 /* the device has written an Ethernet frame in the data area
310 * of the sk_buff without updating the structure, do it now */
311 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
312 size = le16_to_cpu(control_block->rx_data_low[index].size);
313 skb = priv->data_low_rx[index];
314 offset = ((unsigned long)
315 le32_to_cpu(control_block->rx_data_low[index].address) -
316 (unsigned long) skb->data) & 3;
317
318 #if VERBOSE > SHOW_ERROR_MESSAGES
319 DEBUG(SHOW_TRACING,
320 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n",
321 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
322 skb->len, offset, skb->truesize);
323 #endif
324
325 /* delete the streaming DMA mapping before processing the skb */
326 pci_unmap_single(priv->pdev,
327 priv->pci_map_rx_address[index],
328 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
329
330 /* update the skb structure and align the buffer */
331 skb_put(skb, size);
332 if (offset) {
333 /* shift the buffer allocation offset bytes to get the right frame */
334 skb_pull(skb, 2);
335 skb_put(skb, 2);
336 }
337 #if VERBOSE > SHOW_ERROR_MESSAGES
338 /* display the buffer contents for debugging */
339 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
340 display_buffer((char *) skb->data, skb->len);
341 #endif
342
343 /* check whether WDS is enabled and whether the data frame is a WDS frame */
344
345 if (init_wds) {
346 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
347 src = skb->data + 6;
348 memmove(skb->data, src, skb->len - 6);
349 skb_trim(skb, skb->len - 6);
350 }
351 #if VERBOSE > SHOW_ERROR_MESSAGES
352 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
353 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
354
355 /* display the buffer contents for debugging */
356 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
357 display_buffer((char *) skb->data, skb->len);
358 #endif
359 /* take care of monitor mode and spy monitoring. */
360 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
361 skb->dev = ndev;
362 discard = islpci_monitor_rx(priv, &skb);
363 } else {
364 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
365 /* The packet has a rx_annex. Read it for spy monitoring, Then
366 * remove it, while keeping the 2 leading MAC addr.
367 */
368 struct iw_quality wstats;
369 struct rx_annex_header *annex =
370 (struct rx_annex_header *) skb->data;
371 wstats.level = annex->rfmon.rssi;
372 /* The noise value can be a bit outdated if nobody's
373 * reading wireless stats... */
374 wstats.noise = priv->local_iwstatistics.qual.noise;
375 wstats.qual = wstats.level - wstats.noise;
376 wstats.updated = 0x07;
377 /* Update spy records */
378 wireless_spy_update(ndev, annex->addr2, &wstats);
379
380 skb_copy_from_linear_data(skb,
381 (skb->data +
382 sizeof(struct rfmon_header)),
383 2 * ETH_ALEN);
384 skb_pull(skb, sizeof (struct rfmon_header));
385 }
386 skb->protocol = eth_type_trans(skb, ndev);
387 }
388 skb->ip_summed = CHECKSUM_NONE;
389 ndev->stats.rx_packets++;
390 ndev->stats.rx_bytes += size;
391
392 /* deliver the skb to the network layer */
393 #ifdef ISLPCI_ETH_DEBUG
394 printk
395 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
396 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
397 skb->data[4], skb->data[5]);
398 #endif
399 if (unlikely(discard)) {
400 dev_kfree_skb_irq(skb);
401 skb = NULL;
402 } else
403 netif_rx(skb);
404
405 /* increment the read index for the rx data low queue */
406 priv->free_data_rx++;
407
408 /* add one or more sk_buff structures */
409 while (index =
410 le32_to_cpu(control_block->
411 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
412 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
413 /* allocate an sk_buff for received data frames storage
414 * include any required allignment operations */
415 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
416 if (unlikely(skb == NULL)) {
417 /* error allocating an sk_buff structure elements */
418 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
419 break;
420 }
421 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
422 /* store the new skb structure pointer */
423 index = index % ISL38XX_CB_RX_QSIZE;
424 priv->data_low_rx[index] = skb;
425
426 #if VERBOSE > SHOW_ERROR_MESSAGES
427 DEBUG(SHOW_TRACING,
428 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n",
429 skb, skb->data, skb->len, index, skb->truesize);
430 #endif
431
432 /* set the streaming DMA mapping for proper PCI bus operation */
433 priv->pci_map_rx_address[index] =
434 pci_map_single(priv->pdev, (void *) skb->data,
435 MAX_FRAGMENT_SIZE_RX + 2,
436 PCI_DMA_FROMDEVICE);
437 if (pci_dma_mapping_error(priv->pdev,
438 priv->pci_map_rx_address[index])) {
439 /* error mapping the buffer to device accessible memory address */
440 DEBUG(SHOW_ERROR_MESSAGES,
441 "Error mapping DMA address\n");
442
443 /* free the skbuf structure before aborting */
444 dev_kfree_skb_irq(skb);
445 skb = NULL;
446 break;
447 }
448 /* update the fragment address */
449 control_block->rx_data_low[index].address =
450 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
451 wmb();
452
453 /* increment the driver read pointer */
454 le32_add_cpu(&control_block->
455 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
456 }
457
458 /* trigger the device */
459 islpci_trigger(priv);
460
461 return 0;
462 }
463
464 void
islpci_do_reset_and_wake(struct work_struct * work)465 islpci_do_reset_and_wake(struct work_struct *work)
466 {
467 islpci_private *priv = container_of(work, islpci_private, reset_task);
468
469 islpci_reset(priv, 1);
470 priv->reset_task_pending = 0;
471 smp_wmb();
472 netif_wake_queue(priv->ndev);
473 }
474
475 void
islpci_eth_tx_timeout(struct net_device * ndev)476 islpci_eth_tx_timeout(struct net_device *ndev)
477 {
478 islpci_private *priv = netdev_priv(ndev);
479
480 /* increment the transmit error counter */
481 ndev->stats.tx_errors++;
482
483 if (!priv->reset_task_pending) {
484 printk(KERN_WARNING
485 "%s: tx_timeout, scheduling reset", ndev->name);
486 netif_stop_queue(ndev);
487 priv->reset_task_pending = 1;
488 schedule_work(&priv->reset_task);
489 } else {
490 printk(KERN_WARNING
491 "%s: tx_timeout, waiting for reset", ndev->name);
492 }
493 }
494
