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
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.
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
19 #include <linux/module.h>
20 #include <linux/gfp.h>
22 #include <linux/pci.h>
23 #include <linux/delay.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_arp.h>
27 #include <asm/byteorder.h>
29 #include "prismcompat.h"
31 #include "islpci_eth.h"
32 #include "islpci_mgt.h"
35 /******************************************************************************
36 Network Interface functions
37 ******************************************************************************/
39 islpci_eth_cleanup_transmit(islpci_private *priv,
40 isl38xx_control_block *control_block)
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;
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]) {
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];
59 #if VERBOSE > SHOW_ERROR_MESSAGES
61 "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
62 skb, skb->data, skb->len, skb->truesize);
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);
71 /* increment the free data low queue pointer */
77 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
79 islpci_private *priv = netdev_priv(ndev);
80 isl38xx_control_block *cb = priv->control_block;
82 dma_addr_t pci_map_address;
84 isl38xx_fragment *fragment;
86 struct sk_buff *newskb;
89 unsigned char wds_mac[6];
92 #if VERBOSE > SHOW_ERROR_MESSAGES
93 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
96 /* lock the driver code */
97 spin_lock_irqsave(&priv->slock, flags);
99 /* check whether the destination queue has enough fragments for the frame */
100 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
101 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
102 printk(KERN_ERR "%s: transmit device queue full when awake\n",
104 netif_stop_queue(ndev);
106 /* trigger the device */
107 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
108 ISL38XX_DEV_INT_REG);
109 udelay(ISL38XX_WRITEIO_DELAY);
112 /* Check alignment and WDS frame formatting. The start of the packet should
113 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
114 * and add WDS address information */
115 if (likely(((long) skb->data & 0x03) | init_wds)) {
116 /* get the number of bytes to add and re-allign */
117 offset = (4 - (long) skb->data) & 0x03;
118 offset += init_wds ? 6 : 0;
120 /* check whether the current skb can be used */
121 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
122 unsigned char *src = skb->data;
124 #if VERBOSE > SHOW_ERROR_MESSAGES
125 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
129 /* align the buffer on 4-byte boundary */
130 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
132 /* wds requires an additional address field of 6 bytes */
134 #ifdef ISLPCI_ETH_DEBUG
135 printk("islpci_eth_transmit:wds_mac\n");
137 memmove(skb->data + 6, src, skb->len);
138 skb_copy_to_linear_data(skb, wds_mac, 6);
140 memmove(skb->data, src, skb->len);
143 #if VERBOSE > SHOW_ERROR_MESSAGES
144 DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
149 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
150 if (unlikely(newskb == NULL)) {
151 printk(KERN_ERR "%s: Cannot allocate skb\n",
155 newskb_offset = (4 - (long) newskb->data) & 0x03;
157 /* Check if newskb->data is aligned */
159 skb_reserve(newskb, newskb_offset);
161 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
163 skb_copy_from_linear_data(skb,
166 skb_copy_to_linear_data(newskb, wds_mac, 6);
167 #ifdef ISLPCI_ETH_DEBUG
168 printk("islpci_eth_transmit:wds_mac\n");
171 skb_copy_from_linear_data(skb, newskb->data,
174 #if VERBOSE > SHOW_ERROR_MESSAGES
175 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
176 newskb->data, skb->data, skb->len, init_wds);
179 newskb->dev = skb->dev;
180 dev_kfree_skb_irq(skb);
184 /* display the buffer contents for debugging */
185 #if VERBOSE > SHOW_ERROR_MESSAGES
186 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
187 display_buffer((char *) skb->data, skb->len);
190 /* map the skb buffer to pci memory for DMA operation */
191 pci_map_address = pci_map_single(priv->pdev,
192 (void *) skb->data, skb->len,
194 if (unlikely(pci_map_address == 0)) {
195 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
199 /* Place the fragment in the control block structure. */
200 index = curr_frag % ISL38XX_CB_TX_QSIZE;
201 fragment = &cb->tx_data_low[index];
203 priv->pci_map_tx_address[index] = pci_map_address;
204 /* store the skb address for future freeing */
205 priv->data_low_tx[index] = skb;
206 /* set the proper fragment start address and size information */
207 frame_size = skb->len;
208 fragment->size = cpu_to_le16(frame_size);
209 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
210 fragment->address = cpu_to_le32(pci_map_address);
213 /* The fragment address in the control block must have been
214 * written before announcing the frame buffer to device. */
216 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
218 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
219 > ISL38XX_CB_TX_QSIZE) {
220 /* stop sends from upper layers */
221 netif_stop_queue(ndev);
223 /* set the full flag for the transmission queue */
224 priv->data_low_tx_full = 1;
227 /* set the transmission time */
228 ndev->trans_start = jiffies;
229 ndev->stats.tx_packets++;
230 ndev->stats.tx_bytes += skb->len;
232 /* trigger the device */
233 islpci_trigger(priv);
235 /* unlock the driver code */
236 spin_unlock_irqrestore(&priv->slock, flags);
241 ndev->stats.tx_dropped++;
242 spin_unlock_irqrestore(&priv->slock, flags);
248 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
250 /* The card reports full 802.11 packets but with a 20 bytes
251 * header and without the FCS. But there a is a bit that
252 * indicates if the packet is corrupted :-) */
253 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
255 if (hdr->flags & 0x01)
256 /* This one is bad. Drop it ! */
258 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
259 struct avs_80211_1_header *avs;
260 /* extract the relevant data from the header */
261 u32 clock = le32_to_cpu(hdr->clock);
263 u16 freq = le16_to_cpu(hdr->freq);
266 skb_pull(*skb, sizeof (struct rfmon_header));
268 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
269 struct sk_buff *newskb = skb_copy_expand(*skb,
274 dev_kfree_skb_irq(*skb);
278 /* This behavior is not very subtile... */
281 /* make room for the new header and fill it. */
283 (struct avs_80211_1_header *) skb_push(*skb,
285 avs_80211_1_header));
287 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
288 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
289 avs->mactime = cpu_to_be64(clock);
290 avs->hosttime = cpu_to_be64(jiffies);
291 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
292 avs->channel = cpu_to_be32(channel_of_freq(freq));
293 avs->datarate = cpu_to_be32(rate * 5);
294 avs->antenna = cpu_to_be32(0); /*unknown */
295 avs->priority = cpu_to_be32(0); /*unknown */
296 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
297 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
298 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
299 avs->preamble = cpu_to_be32(0); /*unknown */
300 avs->encoding = cpu_to_be32(0); /*unknown */
302 skb_pull(*skb, sizeof (struct rfmon_header));
304 (*skb)->protocol = htons(ETH_P_802_2);
305 skb_reset_mac_header(*skb);
306 (*skb)->pkt_type = PACKET_OTHERHOST;
312 islpci_eth_receive(islpci_private *priv)
314 struct net_device *ndev = priv->ndev;
315 isl38xx_control_block *control_block = priv->control_block;
322 #if VERBOSE > SHOW_ERROR_MESSAGES
323 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
326 /* the device has written an Ethernet frame in the data area
327 * of the sk_buff without updating the structure, do it now */
328 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
329 size = le16_to_cpu(control_block->rx_data_low[index].size);
330 skb = priv->data_low_rx[index];
331 offset = ((unsigned long)
332 le32_to_cpu(control_block->rx_data_low[index].address) -
333 (unsigned long) skb->data) & 3;
335 #if VERBOSE > SHOW_ERROR_MESSAGES
337 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
338 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
339 skb->len, offset, skb->truesize);
342 /* delete the streaming DMA mapping before processing the skb */
343 pci_unmap_single(priv->pdev,
344 priv->pci_map_rx_address[index],
345 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
347 /* update the skb structure and allign the buffer */
350 /* shift the buffer allocation offset bytes to get the right frame */
354 #if VERBOSE > SHOW_ERROR_MESSAGES
355 /* display the buffer contents for debugging */
356 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
357 display_buffer((char *) skb->data, skb->len);
360 /* check whether WDS is enabled and whether the data frame is a WDS frame */
363 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
365 memmove(skb->data, src, skb->len - 6);
366 skb_trim(skb, skb->len - 6);
368 #if VERBOSE > SHOW_ERROR_MESSAGES
369 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
370 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
372 /* display the buffer contents for debugging */
373 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
374 display_buffer((char *) skb->data, skb->len);
376 /* take care of monitor mode and spy monitoring. */
377 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
379 discard = islpci_monitor_rx(priv, &skb);
381 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
382 /* The packet has a rx_annex. Read it for spy monitoring, Then
383 * remove it, while keeping the 2 leading MAC addr.
385 struct iw_quality wstats;
386 struct rx_annex_header *annex =
387 (struct rx_annex_header *) skb->data;
388 wstats.level = annex->rfmon.rssi;
389 /* The noise value can be a bit outdated if nobody's
390 * reading wireless stats... */
391 wstats.noise = priv->local_iwstatistics.qual.noise;
392 wstats.qual = wstats.level - wstats.noise;
393 wstats.updated = 0x07;
394 /* Update spy records */
395 wireless_spy_update(ndev, annex->addr2, &wstats);
397 skb_copy_from_linear_data(skb,
399 sizeof(struct rfmon_header)),
401 skb_pull(skb, sizeof (struct rfmon_header));
403 skb->protocol = eth_type_trans(skb, ndev);
405 skb->ip_summed = CHECKSUM_NONE;
406 ndev->stats.rx_packets++;
407 ndev->stats.rx_bytes += size;
409 /* deliver the skb to the network layer */
410 #ifdef ISLPCI_ETH_DEBUG
412 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
413 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
414 skb->data[4], skb->data[5]);
416 if (unlikely(discard)) {
417 dev_kfree_skb_irq(skb);
422 /* increment the read index for the rx data low queue */
423 priv->free_data_rx++;
425 /* add one or more sk_buff structures */
427 le32_to_cpu(control_block->
428 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
429 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
430 /* allocate an sk_buff for received data frames storage
431 * include any required allignment operations */
432 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
433 if (unlikely(skb == NULL)) {
434 /* error allocating an sk_buff structure elements */
435 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
438 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
439 /* store the new skb structure pointer */
440 index = index % ISL38XX_CB_RX_QSIZE;
441 priv->data_low_rx[index] = skb;
443 #if VERBOSE > SHOW_ERROR_MESSAGES
445 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
446 skb, skb->data, skb->len, index, skb->truesize);
449 /* set the streaming DMA mapping for proper PCI bus operation */
450 priv->pci_map_rx_address[index] =
451 pci_map_single(priv->pdev, (void *) skb->data,
452 MAX_FRAGMENT_SIZE_RX + 2,
454 if (unlikely(!priv->pci_map_rx_address[index])) {
455 /* error mapping the buffer to device accessable memory address */
456 DEBUG(SHOW_ERROR_MESSAGES,
457 "Error mapping DMA address\n");
459 /* free the skbuf structure before aborting */
460 dev_kfree_skb_irq((struct sk_buff *) skb);
464 /* update the fragment address */
465 control_block->rx_data_low[index].address =
466 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
469 /* increment the driver read pointer */
470 le32_add_cpu(&control_block->
471 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
474 /* trigger the device */
475 islpci_trigger(priv);
481 islpci_do_reset_and_wake(struct work_struct *work)
483 islpci_private *priv = container_of(work, islpci_private, reset_task);
485 islpci_reset(priv, 1);
486 priv->reset_task_pending = 0;
488 netif_wake_queue(priv->ndev);
492 islpci_eth_tx_timeout(struct net_device *ndev)
494 islpci_private *priv = netdev_priv(ndev);
496 /* increment the transmit error counter */
497 ndev->stats.tx_errors++;
499 if (!priv->reset_task_pending) {
501 "%s: tx_timeout, scheduling reset", ndev->name);
502 netif_stop_queue(ndev);
503 priv->reset_task_pending = 1;
504 schedule_work(&priv->reset_task);
507 "%s: tx_timeout, waiting for reset", ndev->name);