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>
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>
27 #include "prismcompat.h"
29 #include "islpci_eth.h"
30 #include "islpci_mgt.h"
33 /******************************************************************************
34 Network Interface functions
35 ******************************************************************************/
37 islpci_eth_cleanup_transmit(islpci_private
*priv
,
38 isl38xx_control_block
*control_block
)
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
;
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
];
57 #if VERBOSE > SHOW_ERROR_MESSAGES
59 "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
60 skb
, skb
->data
, skb
->len
, skb
->truesize
);
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
);
69 /* increment the free data low queue pointer */
75 islpci_eth_transmit(struct sk_buff
*skb
, struct net_device
*ndev
)
77 islpci_private
*priv
= netdev_priv(ndev
);
78 isl38xx_control_block
*cb
= priv
->control_block
;
80 dma_addr_t pci_map_address
;
82 isl38xx_fragment
*fragment
;
84 struct sk_buff
*newskb
;
87 unsigned char wds_mac
[6];
91 #if VERBOSE > SHOW_ERROR_MESSAGES
92 DEBUG(SHOW_FUNCTION_CALLS
, "islpci_eth_transmit \n");
95 /* lock the driver code */
96 spin_lock_irqsave(&priv
->slock
, flags
);
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",
103 netif_stop_queue(ndev
);
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
);
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;
121 /* check whether the current skb can be used */
122 if (!skb_cloned(skb
) && (skb_tailroom(skb
) >= offset
)) {
123 unsigned char *src
= skb
->data
;
125 #if VERBOSE > SHOW_ERROR_MESSAGES
126 DEBUG(SHOW_TRACING
, "skb offset %i wds %i\n", offset
,
130 /* align the buffer on 4-byte boundary */
131 skb_reserve(skb
, (4 - (long) skb
->data
) & 0x03);
133 /* wds requires an additional address field of 6 bytes */
135 #ifdef ISLPCI_ETH_DEBUG
136 printk("islpci_eth_transmit:wds_mac\n");
138 memmove(skb
->data
+ 6, src
, skb
->len
);
139 memcpy(skb
->data
, wds_mac
, 6);
141 memmove(skb
->data
, src
, skb
->len
);
144 #if VERBOSE > SHOW_ERROR_MESSAGES
145 DEBUG(SHOW_TRACING
, "memmove %p %p %i \n", skb
->data
,
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",
157 newskb_offset
= (4 - (long) newskb
->data
) & 0x03;
159 /* Check if newskb->data is aligned */
161 skb_reserve(newskb
, newskb_offset
);
163 skb_put(newskb
, init_wds
? skb
->len
+ 6 : skb
->len
);
165 memcpy(newskb
->data
+ 6, skb
->data
, skb
->len
);
166 memcpy(newskb
->data
, wds_mac
, 6);
167 #ifdef ISLPCI_ETH_DEBUG
168 printk("islpci_eth_transmit:wds_mac\n");
171 memcpy(newskb
->data
, skb
->data
, skb
->len
);
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
);
178 newskb
->dev
= skb
->dev
;
179 dev_kfree_skb_irq(skb
);
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
);
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
,
193 if (unlikely(pci_map_address
== 0)) {
194 printk(KERN_WARNING
"%s: cannot map buffer to PCI\n",
200 /* Place the fragment in the control block structure. */
201 index
= curr_frag
% ISL38XX_CB_TX_QSIZE
;
202 fragment
= &cb
->tx_data_low
[index
];
204 priv
->pci_map_tx_address
[index
] = pci_map_address
;
205 /* store the skb address for future freeing */
206 priv
->data_low_tx
[index
] = skb
;
207 /* set the proper fragment start address and size information */
208 frame_size
= skb
->len
;
209 fragment
->size
= cpu_to_le16(frame_size
);
210 fragment
->flags
= cpu_to_le16(0); /* set to 1 if more fragments */
211 fragment
->address
= cpu_to_le32(pci_map_address
);
214 /* The fragment address in the control block must have been
215 * written before announcing the frame buffer to device. */
217 cb
->driver_curr_frag
[ISL38XX_CB_TX_DATA_LQ
] = cpu_to_le32(curr_frag
);
219 if (curr_frag
- priv
->free_data_tx
+ ISL38XX_MIN_QTHRESHOLD
220 > ISL38XX_CB_TX_QSIZE
) {
221 /* stop sends from upper layers */
222 netif_stop_queue(ndev
);
224 /* set the full flag for the transmission queue */
225 priv
->data_low_tx_full
= 1;
228 /* set the transmission time */
229 ndev
->trans_start
= jiffies
;
230 priv
->statistics
.tx_packets
++;
231 priv
->statistics
.tx_bytes
+= skb
->len
;
233 /* trigger the device */
234 islpci_trigger(priv
);
236 /* unlock the driver code */
237 spin_unlock_irqrestore(&priv
->slock
, flags
);
242 priv
->statistics
.tx_dropped
++;
243 spin_unlock_irqrestore(&priv
->slock
, flags
);
249 islpci_monitor_rx(islpci_private
*priv
, struct sk_buff
**skb
)
251 /* The card reports full 802.11 packets but with a 20 bytes
252 * header and without the FCS. But there a is a bit that
253 * indicates if the packet is corrupted :-) */
254 struct rfmon_header
*hdr
= (struct rfmon_header
*) (*skb
)->data
;
256 if (hdr
->flags
& 0x01)
257 /* This one is bad. Drop it ! */
259 if (priv
->ndev
->type
== ARPHRD_IEEE80211_PRISM
) {
260 struct avs_80211_1_header
*avs
;
261 /* extract the relevant data from the header */
262 u32 clock
= le32_to_cpu(hdr
->clock
);
264 u16 freq
= le16_to_cpu(hdr
->freq
);
267 skb_pull(*skb
, sizeof (struct rfmon_header
));
269 if (skb_headroom(*skb
) < sizeof (struct avs_80211_1_header
)) {
270 struct sk_buff
*newskb
= skb_copy_expand(*skb
,
275 dev_kfree_skb_irq(*skb
);
279 /* This behavior is not very subtile... */
282 /* make room for the new header and fill it. */
284 (struct avs_80211_1_header
*) skb_push(*skb
,
286 avs_80211_1_header
));
288 avs
->version
= cpu_to_be32(P80211CAPTURE_VERSION
);
289 avs
->length
= cpu_to_be32(sizeof (struct avs_80211_1_header
));
290 avs
->mactime
= cpu_to_be64(le64_to_cpu(clock
));
291 avs
->hosttime
= cpu_to_be64(jiffies
);
292 avs
->phytype
= cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
293 avs
->channel
= cpu_to_be32(channel_of_freq(freq
));
294 avs
->datarate
= cpu_to_be32(rate
* 5);
295 avs
->antenna
= cpu_to_be32(0); /*unknown */
296 avs
->priority
= cpu_to_be32(0); /*unknown */
297 avs
->ssi_type
= cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
298 avs
->ssi_signal
= cpu_to_be32(rssi
& 0x7f);
299 avs
->ssi_noise
= cpu_to_be32(priv
->local_iwstatistics
.qual
.noise
); /*better than 'undefined', I assume */
300 avs
->preamble
= cpu_to_be32(0); /*unknown */
301 avs
->encoding
= cpu_to_be32(0); /*unknown */
303 skb_pull(*skb
, sizeof (struct rfmon_header
));
305 (*skb
)->protocol
= htons(ETH_P_802_2
);
306 skb_reset_mac_header(*skb
);
307 (*skb
)->pkt_type
= PACKET_OTHERHOST
;
313 islpci_eth_receive(islpci_private
*priv
)
315 struct net_device
*ndev
= priv
->ndev
;
316 isl38xx_control_block
*control_block
= priv
->control_block
;
323 #if VERBOSE > SHOW_ERROR_MESSAGES
324 DEBUG(SHOW_FUNCTION_CALLS
, "islpci_eth_receive \n");
327 /* the device has written an Ethernet frame in the data area
328 * of the sk_buff without updating the structure, do it now */
329 index
= priv
->free_data_rx
% ISL38XX_CB_RX_QSIZE
;
330 size
= le16_to_cpu(control_block
->rx_data_low
[index
].size
);
331 skb
= priv
->data_low_rx
[index
];
332 offset
= ((unsigned long)
333 le32_to_cpu(control_block
->rx_data_low
[index
].address
) -
334 (unsigned long) skb
->data
) & 3;
336 #if VERBOSE > SHOW_ERROR_MESSAGES
338 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
339 control_block
->rx_data_low
[priv
->free_data_rx
].address
, skb
->data
,
340 skb
->len
, offset
, skb
->truesize
);
343 /* delete the streaming DMA mapping before processing the skb */
344 pci_unmap_single(priv
->pdev
,
345 priv
->pci_map_rx_address
[index
],
346 MAX_FRAGMENT_SIZE_RX
+ 2, PCI_DMA_FROMDEVICE
);
348 /* update the skb structure and allign the buffer */
351 /* shift the buffer allocation offset bytes to get the right frame */
355 #if VERBOSE > SHOW_ERROR_MESSAGES
356 /* display the buffer contents for debugging */
357 DEBUG(SHOW_BUFFER_CONTENTS
, "\nrx %p ", skb
->data
);
358 display_buffer((char *) skb
->data
, skb
->len
);
361 /* check whether WDS is enabled and whether the data frame is a WDS frame */
364 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
366 memmove(skb
->data
, src
, skb
->len
- 6);
367 skb_trim(skb
, skb
->len
- 6);
369 #if VERBOSE > SHOW_ERROR_MESSAGES
370 DEBUG(SHOW_TRACING
, "Fragment size %i in skb at %p\n", size
, skb
);
371 DEBUG(SHOW_TRACING
, "Skb data at %p, length %i\n", skb
->data
, skb
->len
);
373 /* display the buffer contents for debugging */
374 DEBUG(SHOW_BUFFER_CONTENTS
, "\nrx %p ", skb
->data
);
375 display_buffer((char *) skb
->data
, skb
->len
);
377 /* take care of monitor mode and spy monitoring. */
378 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 memcpy(skb
->data
+ sizeof (struct rfmon_header
),
398 skb
->data
, 2 * ETH_ALEN
);
399 skb_pull(skb
, sizeof (struct rfmon_header
));
401 skb
->protocol
= eth_type_trans(skb
, ndev
);
403 skb
->ip_summed
= CHECKSUM_NONE
;
404 priv
->statistics
.rx_packets
++;
405 priv
->statistics
.rx_bytes
+= size
;
407 /* deliver the skb to the network layer */
408 #ifdef ISLPCI_ETH_DEBUG
410 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
411 skb
->data
[0], skb
->data
[1], skb
->data
[2], skb
->data
[3],
412 skb
->data
[4], skb
->data
[5]);
414 if (unlikely(discard
)) {
415 dev_kfree_skb_irq(skb
);
420 /* increment the read index for the rx data low queue */
421 priv
->free_data_rx
++;
423 /* add one or more sk_buff structures */
425 le32_to_cpu(control_block
->
426 driver_curr_frag
[ISL38XX_CB_RX_DATA_LQ
]),
427 index
- priv
->free_data_rx
< ISL38XX_CB_RX_QSIZE
) {
428 /* allocate an sk_buff for received data frames storage
429 * include any required allignment operations */
430 skb
= dev_alloc_skb(MAX_FRAGMENT_SIZE_RX
+ 2);
431 if (unlikely(skb
== NULL
)) {
432 /* error allocating an sk_buff structure elements */
433 DEBUG(SHOW_ERROR_MESSAGES
, "Error allocating skb \n");
436 skb_reserve(skb
, (4 - (long) skb
->data
) & 0x03);
437 /* store the new skb structure pointer */
438 index
= index
% ISL38XX_CB_RX_QSIZE
;
439 priv
->data_low_rx
[index
] = skb
;
441 #if VERBOSE > SHOW_ERROR_MESSAGES
443 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
444 skb
, skb
->data
, skb
->len
, index
, skb
->truesize
);
447 /* set the streaming DMA mapping for proper PCI bus operation */
448 priv
->pci_map_rx_address
[index
] =
449 pci_map_single(priv
->pdev
, (void *) skb
->data
,
450 MAX_FRAGMENT_SIZE_RX
+ 2,
452 if (unlikely(priv
->pci_map_rx_address
[index
] == (dma_addr_t
) NULL
)) {
453 /* error mapping the buffer to device accessable memory address */
454 DEBUG(SHOW_ERROR_MESSAGES
,
455 "Error mapping DMA address\n");
457 /* free the skbuf structure before aborting */
458 dev_kfree_skb_irq((struct sk_buff
*) skb
);
462 /* update the fragment address */
463 control_block
->rx_data_low
[index
].address
=
464 cpu_to_le32((u32
)priv
->pci_map_rx_address
[index
]);
467 /* increment the driver read pointer */
468 add_le32p((u32
*) &control_block
->
469 driver_curr_frag
[ISL38XX_CB_RX_DATA_LQ
], 1);
472 /* trigger the device */
473 islpci_trigger(priv
);
479 islpci_do_reset_and_wake(struct work_struct
*work
)
481 islpci_private
*priv
= container_of(work
, islpci_private
, reset_task
);
483 islpci_reset(priv
, 1);
484 priv
->reset_task_pending
= 0;
486 netif_wake_queue(priv
->ndev
);
490 islpci_eth_tx_timeout(struct net_device
*ndev
)
492 islpci_private
*priv
= netdev_priv(ndev
);
493 struct net_device_stats
*statistics
= &priv
->statistics
;
495 /* increment the transmit error counter */
496 statistics
->tx_errors
++;
498 if (!priv
->reset_task_pending
) {
500 "%s: tx_timeout, scheduling reset", ndev
->name
);
501 netif_stop_queue(ndev
);
502 priv
->reset_task_pending
= 1;
503 schedule_work(&priv
->reset_task
);
506 "%s: tx_timeout, waiting for reset", ndev
->name
);