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 dma_unmap_single(&priv->pdev->dev,
54 priv->pci_map_tx_address[index],
55 skb->len, DMA_TO_DEVICE);
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 = dma_map_single(&priv->pdev->dev, (void *)skb->data,
180 skb->len, DMA_TO_DEVICE);
181 if (dma_mapping_error(&priv->pdev->dev, pci_map_address)) {
182 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
183 ndev->name);
184 goto drop_free;
185 }
186 /* Place the fragment in the control block structure. */
187 index = curr_frag % ISL38XX_CB_TX_QSIZE;
188 fragment = &cb->tx_data_low[index];
189
190 priv->pci_map_tx_address[index] = pci_map_address;
191 /* store the skb address for future freeing */
192 priv->data_low_tx[index] = skb;
193 /* set the proper fragment start address and size information */
194 frame_size = skb->len;
195 fragment->size = cpu_to_le16(frame_size);
196 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
197 fragment->address = cpu_to_le32(pci_map_address);
198 curr_frag++;
199
200 /* The fragment address in the control block must have been
201 * written before announcing the frame buffer to device. */
202 wmb();
203 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
204
205 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
206 > ISL38XX_CB_TX_QSIZE) {
207 /* stop sends from upper layers */
208 netif_stop_queue(ndev);
209
210 /* set the full flag for the transmission queue */
211 priv->data_low_tx_full = 1;
212 }
213
214 ndev->stats.tx_packets++;
215 ndev->stats.tx_bytes += skb->len;
216
217 /* trigger the device */
218 islpci_trigger(priv);
219
220 /* unlock the driver code */
221 spin_unlock_irqrestore(&priv->slock, flags);
222
223 return NETDEV_TX_OK;
224
225 drop_free:
226 ndev->stats.tx_dropped++;
227 spin_unlock_irqrestore(&priv->slock, flags);
228 dev_kfree_skb(skb);
229 return NETDEV_TX_OK;
230 }
231
232 static inline int
islpci_monitor_rx(islpci_private * priv,struct sk_buff ** skb)233 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
234 {
235 /* The card reports full 802.11 packets but with a 20 bytes
236 * header and without the FCS. But there a is a bit that
237 * indicates if the packet is corrupted :-) */
238 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
239
240 if (hdr->flags & 0x01)
241 /* This one is bad. Drop it ! */
242 return -1;
243 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
244 struct avs_80211_1_header *avs;
245 /* extract the relevant data from the header */
246 u32 clock = le32_to_cpu(hdr->clock);
247 u8 rate = hdr->rate;
248 u16 freq = le16_to_cpu(hdr->freq);
249 u8 rssi = hdr->rssi;
250
251 skb_pull(*skb, sizeof (struct rfmon_header));
252
253 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
254 struct sk_buff *newskb = skb_copy_expand(*skb,
255 sizeof (struct
256 avs_80211_1_header),
257 0, GFP_ATOMIC);
258 if (newskb) {
259 dev_kfree_skb_irq(*skb);
260 *skb = newskb;
261 } else
262 return -1;
263 /* This behavior is not very subtile... */
264 }
265
266 /* make room for the new header and fill it. */
267 avs = skb_push(*skb, sizeof(struct avs_80211_1_header));
268
269 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
270 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
271 avs->mactime = cpu_to_be64(clock);
272 avs->hosttime = cpu_to_be64(jiffies);
273 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
274 avs->channel = cpu_to_be32(channel_of_freq(freq));
275 avs->datarate = cpu_to_be32(rate * 5);
276 avs->antenna = cpu_to_be32(0); /*unknown */
277 avs->priority = cpu_to_be32(0); /*unknown */
278 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
279 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
280 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
281 avs->preamble = cpu_to_be32(0); /*unknown */
282 avs->encoding = cpu_to_be32(0); /*unknown */
283 } else
284 skb_pull(*skb, sizeof (struct rfmon_header));
285
286 (*skb)->protocol = htons(ETH_P_802_2);
287 skb_reset_mac_header(*skb);
288 (*skb)->pkt_type = PACKET_OTHERHOST;
289
290 return 0;
291 }
292
293 int
islpci_eth_receive(islpci_private * priv)294 islpci_eth_receive(islpci_private *priv)
295 {
296 struct net_device *ndev = priv->ndev;
297 isl38xx_control_block *control_block = priv->control_block;
298 struct sk_buff *skb;
299 u16 size;
300 u32 index, offset;
301 unsigned char *src;
302 int discard = 0;
303
304 #if VERBOSE > SHOW_ERROR_MESSAGES
305 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive\n");
306 #endif
307
308 /* the device has written an Ethernet frame in the data area
309 * of the sk_buff without updating the structure, do it now */
310 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
311 size = le16_to_cpu(control_block->rx_data_low[index].size);
312 skb = priv->data_low_rx[index];
313 offset = ((unsigned long)
314 le32_to_cpu(control_block->rx_data_low[index].address) -
315 (unsigned long) skb->data) & 3;
316
317 #if VERBOSE > SHOW_ERROR_MESSAGES
318 DEBUG(SHOW_TRACING,
319 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n",
320 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
321 skb->len, offset, skb->truesize);
322 #endif
323
324 /* delete the streaming DMA mapping before processing the skb */
325 dma_unmap_single(&priv->pdev->dev, priv->pci_map_rx_address[index],
326 MAX_FRAGMENT_SIZE_RX + 2, DMA_FROM_DEVICE);
327
328 /* update the skb structure and align the buffer */
329 skb_put(skb, size);
330 if (offset) {
331 /* shift the buffer allocation offset bytes to get the right frame */
332 skb_pull(skb, 2);
333 skb_put(skb, 2);
334 }
335 #if VERBOSE > SHOW_ERROR_MESSAGES
336 /* display the buffer contents for debugging */
337 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
338 display_buffer((char *) skb->data, skb->len);
339 #endif
340
341 /* check whether WDS is enabled and whether the data frame is a WDS frame */
342
343 if (init_wds) {
344 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
345 src = skb->data + 6;
346 memmove(skb->data, src, skb->len - 6);
347 skb_trim(skb, skb->len - 6);
348 }
349 #if VERBOSE > SHOW_ERROR_MESSAGES
350 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
351 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
352
353 /* display the buffer contents for debugging */
354 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
355 display_buffer((char *) skb->data, skb->len);
356 #endif
357 /* take care of monitor mode and spy monitoring. */
358 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
359 skb->dev = ndev;
360 discard = islpci_monitor_rx(priv, &skb);
361 } else {
362 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
363 /* The packet has a rx_annex. Read it for spy monitoring, Then
364 * remove it, while keeping the 2 leading MAC addr.
365 */
366 struct iw_quality wstats;
367 struct rx_annex_header *annex =
368 (struct rx_annex_header *) skb->data;
369 wstats.level = annex->rfmon.rssi;
370 /* The noise value can be a bit outdated if nobody's
371 * reading wireless stats... */
372 wstats.noise = priv->local_iwstatistics.qual.noise;
373 wstats.qual = wstats.level - wstats.noise;
374 wstats.updated = 0x07;
375 /* Update spy records */
376 wireless_spy_update(ndev, annex->addr2, &wstats);
377
378 skb_copy_from_linear_data(skb,
379 (skb->data +
380 sizeof(struct rfmon_header)),
381 2 * ETH_ALEN);
382 skb_pull(skb, sizeof (struct rfmon_header));
383 }
384 skb->protocol = eth_type_trans(skb, ndev);
385 }
386 skb->ip_summed = CHECKSUM_NONE;
387 ndev->stats.rx_packets++;
388 ndev->stats.rx_bytes += size;
389
390 /* deliver the skb to the network layer */
391 #ifdef ISLPCI_ETH_DEBUG
392 printk
393 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
394 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
395 skb->data[4], skb->data[5]);
396 #endif
397 if (unlikely(discard)) {
398 dev_kfree_skb_irq(skb);
399 skb = NULL;
400 } else
401 netif_rx(skb);
402
403 /* increment the read index for the rx data low queue */
404 priv->free_data_rx++;
405
406 /* add one or more sk_buff structures */
407 while (index =
408 le32_to_cpu(control_block->
409 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
410 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
411 /* allocate an sk_buff for received data frames storage
412 * include any required allignment operations */
413 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
414 if (unlikely(skb == NULL)) {
415 /* error allocating an sk_buff structure elements */
416 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb\n");
417 break;
418 }
419 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
420 /* store the new skb structure pointer */
421 index = index % ISL38XX_CB_RX_QSIZE;
422 priv->data_low_rx[index] = skb;
423
424 #if VERBOSE > SHOW_ERROR_MESSAGES
425 DEBUG(SHOW_TRACING,
426 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n",
427 skb, skb->data, skb->len, index, skb->truesize);
428 #endif
429
430 /* set the streaming DMA mapping for proper PCI bus operation */
431 priv->pci_map_rx_address[index] =
432 dma_map_single(&priv->pdev->dev, (void *)skb->data,
433 MAX_FRAGMENT_SIZE_RX + 2, DMA_FROM_DEVICE);
434 if (dma_mapping_error(&priv->pdev->dev, priv->pci_map_rx_address[index])) {
435 /* error mapping the buffer to device accessible memory address */
436 DEBUG(SHOW_ERROR_MESSAGES,
437 "Error mapping DMA address\n");
438
439 /* free the skbuf structure before aborting */
440 dev_kfree_skb_irq(skb);
441 skb = NULL;
442 break;
443 }
444 /* update the fragment address */
445 control_block->rx_data_low[index].address =
446 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
447 wmb();
448
449 /* increment the driver read pointer */
450 le32_add_cpu(&control_block->
451 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
452 }
453
454 /* trigger the device */
455 islpci_trigger(priv);
456
457 return 0;
458 }
459
460 void
islpci_do_reset_and_wake(struct work_struct * work)461 islpci_do_reset_and_wake(struct work_struct *work)
462 {
463 islpci_private *priv = container_of(work, islpci_private, reset_task);
464
465 islpci_reset(priv, 1);
466 priv->reset_task_pending = 0;
467 smp_wmb();
468 netif_wake_queue(priv->ndev);
469 }
470
471 void
islpci_eth_tx_timeout(struct net_device * ndev,unsigned int txqueue)472 islpci_eth_tx_timeout(struct net_device *ndev, unsigned int txqueue)
473 {
474 islpci_private *priv = netdev_priv(ndev);
475
476 /* increment the transmit error counter */
477 ndev->stats.tx_errors++;
478
479 if (!priv->reset_task_pending) {
480 printk(KERN_WARNING
481 "%s: tx_timeout, scheduling reset", ndev->name);
482 netif_stop_queue(ndev);
483 priv->reset_task_pending = 1;
484 schedule_work(&priv->reset_task);
485 } else {
486 printk(KERN_WARNING
487 "%s: tx_timeout, waiting for reset", ndev->name);
488 }
489 }
490