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Merge branch 'wireless-2.6' into wireless-next-2.6
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-lib.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29 #include <linux/etherdevice.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34
35 #include "iwl-dev.h"
36 #include "iwl-core.h"
37 #include "iwl-io.h"
38 #include "iwl-helpers.h"
39 #include "iwl-agn-hw.h"
40 #include "iwl-agn.h"
41 #include "iwl-sta.h"
42
43 static inline u32 iwlagn_get_scd_ssn(struct iwl5000_tx_resp *tx_resp)
44 {
45 return le32_to_cpup((__le32 *)&tx_resp->status +
46 tx_resp->frame_count) & MAX_SN;
47 }
48
49 static int iwlagn_tx_status_reply_tx(struct iwl_priv *priv,
50 struct iwl_ht_agg *agg,
51 struct iwl5000_tx_resp *tx_resp,
52 int txq_id, u16 start_idx)
53 {
54 u16 status;
55 struct agg_tx_status *frame_status = &tx_resp->status;
56 struct ieee80211_tx_info *info = NULL;
57 struct ieee80211_hdr *hdr = NULL;
58 u32 rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
59 int i, sh, idx;
60 u16 seq;
61
62 if (agg->wait_for_ba)
63 IWL_DEBUG_TX_REPLY(priv, "got tx response w/o block-ack\n");
64
65 agg->frame_count = tx_resp->frame_count;
66 agg->start_idx = start_idx;
67 agg->rate_n_flags = rate_n_flags;
68 agg->bitmap = 0;
69
70 /* # frames attempted by Tx command */
71 if (agg->frame_count == 1) {
72 /* Only one frame was attempted; no block-ack will arrive */
73 status = le16_to_cpu(frame_status[0].status);
74 idx = start_idx;
75
76 /* FIXME: code repetition */
77 IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, StartIdx=%d idx=%d\n",
78 agg->frame_count, agg->start_idx, idx);
79
80 info = IEEE80211_SKB_CB(priv->txq[txq_id].txb[idx].skb);
81 info->status.rates[0].count = tx_resp->failure_frame + 1;
82 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
83 info->flags |= iwl_tx_status_to_mac80211(status);
84 iwlagn_hwrate_to_tx_control(priv, rate_n_flags, info);
85
86 /* FIXME: code repetition end */
87
88 IWL_DEBUG_TX_REPLY(priv, "1 Frame 0x%x failure :%d\n",
89 status & 0xff, tx_resp->failure_frame);
90 IWL_DEBUG_TX_REPLY(priv, "Rate Info rate_n_flags=%x\n", rate_n_flags);
91
92 agg->wait_for_ba = 0;
93 } else {
94 /* Two or more frames were attempted; expect block-ack */
95 u64 bitmap = 0;
96
97 /*
98 * Start is the lowest frame sent. It may not be the first
99 * frame in the batch; we figure this out dynamically during
100 * the following loop.
101 */
102 int start = agg->start_idx;
103
104 /* Construct bit-map of pending frames within Tx window */
105 for (i = 0; i < agg->frame_count; i++) {
106 u16 sc;
107 status = le16_to_cpu(frame_status[i].status);
108 seq = le16_to_cpu(frame_status[i].sequence);
109 idx = SEQ_TO_INDEX(seq);
110 txq_id = SEQ_TO_QUEUE(seq);
111
112 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
113 AGG_TX_STATE_ABORT_MSK))
114 continue;
115
116 IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, txq_id=%d idx=%d\n",
117 agg->frame_count, txq_id, idx);
118
119 hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
120 if (!hdr) {
121 IWL_ERR(priv,
122 "BUG_ON idx doesn't point to valid skb"
123 " idx=%d, txq_id=%d\n", idx, txq_id);
124 return -1;
125 }
126
127 sc = le16_to_cpu(hdr->seq_ctrl);
128 if (idx != (SEQ_TO_SN(sc) & 0xff)) {
129 IWL_ERR(priv,
130 "BUG_ON idx doesn't match seq control"
131 " idx=%d, seq_idx=%d, seq=%d\n",
132 idx, SEQ_TO_SN(sc),
133 hdr->seq_ctrl);
134 return -1;
135 }
136
137 IWL_DEBUG_TX_REPLY(priv, "AGG Frame i=%d idx %d seq=%d\n",
138 i, idx, SEQ_TO_SN(sc));
139
140 /*
141 * sh -> how many frames ahead of the starting frame is
142 * the current one?
143 *
144 * Note that all frames sent in the batch must be in a
145 * 64-frame window, so this number should be in [0,63].
146 * If outside of this window, then we've found a new
147 * "first" frame in the batch and need to change start.
148 */
149 sh = idx - start;
150
151 /*
152 * If >= 64, out of window. start must be at the front
153 * of the circular buffer, idx must be near the end of
154 * the buffer, and idx is the new "first" frame. Shift
155 * the indices around.
156 */
157 if (sh >= 64) {
158 /* Shift bitmap by start - idx, wrapped */
159 sh = 0x100 - idx + start;
160 bitmap = bitmap << sh;
161 /* Now idx is the new start so sh = 0 */
162 sh = 0;
163 start = idx;
164 /*
165 * If <= -64 then wraps the 256-pkt circular buffer
166 * (e.g., start = 255 and idx = 0, sh should be 1)
167 */
168 } else if (sh <= -64) {
169 sh = 0x100 - start + idx;
170 /*
171 * If < 0 but > -64, out of window. idx is before start
172 * but not wrapped. Shift the indices around.
173 */
174 } else if (sh < 0) {
175 /* Shift by how far start is ahead of idx */
176 sh = start - idx;
177 bitmap = bitmap << sh;
178 /* Now idx is the new start so sh = 0 */
179 start = idx;
180 sh = 0;
181 }
182 /* Sequence number start + sh was sent in this batch */
183 bitmap |= 1ULL << sh;
184 IWL_DEBUG_TX_REPLY(priv, "start=%d bitmap=0x%llx\n",
185 start, (unsigned long long)bitmap);
186 }
187
188 /*
189 * Store the bitmap and possibly the new start, if we wrapped
190 * the buffer above
191 */
192 agg->bitmap = bitmap;
193 agg->start_idx = start;
194 IWL_DEBUG_TX_REPLY(priv, "Frames %d start_idx=%d bitmap=0x%llx\n",
195 agg->frame_count, agg->start_idx,
196 (unsigned long long)agg->bitmap);
197
198 if (bitmap)
199 agg->wait_for_ba = 1;
200 }
201 return 0;
202 }
203
204 void iwl_check_abort_status(struct iwl_priv *priv,
205 u8 frame_count, u32 status)
206 {
207 if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
208 IWL_ERR(priv, "TODO: Implement Tx flush command!!!\n");
209 }
210 }
211
212 static void iwlagn_rx_reply_tx(struct iwl_priv *priv,
213 struct iwl_rx_mem_buffer *rxb)
214 {
215 struct iwl_rx_packet *pkt = rxb_addr(rxb);
216 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
217 int txq_id = SEQ_TO_QUEUE(sequence);
218 int index = SEQ_TO_INDEX(sequence);
219 struct iwl_tx_queue *txq = &priv->txq[txq_id];
220 struct ieee80211_tx_info *info;
221 struct iwl5000_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
222 u32 status = le16_to_cpu(tx_resp->status.status);
223 int tid;
224 int sta_id;
225 int freed;
226 unsigned long flags;
227
228 if ((index >= txq->q.n_bd) || (iwl_queue_used(&txq->q, index) == 0)) {
229 IWL_ERR(priv, "Read index for DMA queue txq_id (%d) index %d "
230 "is out of range [0-%d] %d %d\n", txq_id,
231 index, txq->q.n_bd, txq->q.write_ptr,
232 txq->q.read_ptr);
233 return;
234 }
235
236 info = IEEE80211_SKB_CB(txq->txb[txq->q.read_ptr].skb);
237 memset(&info->status, 0, sizeof(info->status));
238
239 tid = (tx_resp->ra_tid & IWL50_TX_RES_TID_MSK) >> IWL50_TX_RES_TID_POS;
240 sta_id = (tx_resp->ra_tid & IWL50_TX_RES_RA_MSK) >> IWL50_TX_RES_RA_POS;
241
242 spin_lock_irqsave(&priv->sta_lock, flags);
243 if (txq->sched_retry) {
244 const u32 scd_ssn = iwlagn_get_scd_ssn(tx_resp);
245 struct iwl_ht_agg *agg;
246
247 agg = &priv->stations[sta_id].tid[tid].agg;
248
249 iwlagn_tx_status_reply_tx(priv, agg, tx_resp, txq_id, index);
250
251 /* check if BAR is needed */
252 if ((tx_resp->frame_count == 1) && !iwl_is_tx_success(status))
253 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
254
255 if (txq->q.read_ptr != (scd_ssn & 0xff)) {
256 index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
257 IWL_DEBUG_TX_REPLY(priv, "Retry scheduler reclaim "
258 "scd_ssn=%d idx=%d txq=%d swq=%d\n",
259 scd_ssn , index, txq_id, txq->swq_id);
260
261 freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
262 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
263
264 if (priv->mac80211_registered &&
265 (iwl_queue_space(&txq->q) > txq->q.low_mark) &&
266 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)) {
267 if (agg->state == IWL_AGG_OFF)
268 iwl_wake_queue(priv, txq_id);
269 else
270 iwl_wake_queue(priv, txq->swq_id);
271 }
272 }
273 } else {
274 BUG_ON(txq_id != txq->swq_id);
275
276 info->status.rates[0].count = tx_resp->failure_frame + 1;
277 info->flags |= iwl_tx_status_to_mac80211(status);
278 iwlagn_hwrate_to_tx_control(priv,
279 le32_to_cpu(tx_resp->rate_n_flags),
280 info);
281
282 IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) rate_n_flags "
283 "0x%x retries %d\n",
284 txq_id,
285 iwl_get_tx_fail_reason(status), status,
286 le32_to_cpu(tx_resp->rate_n_flags),
287 tx_resp->failure_frame);
288
289 freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
290 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
291
292 if (priv->mac80211_registered &&
293 (iwl_queue_space(&txq->q) > txq->q.low_mark))
294 iwl_wake_queue(priv, txq_id);
295 }
296
297 iwlagn_txq_check_empty(priv, sta_id, tid, txq_id);
298
299 iwl_check_abort_status(priv, tx_resp->frame_count, status);
300 spin_unlock_irqrestore(&priv->sta_lock, flags);
301 }
302
303 void iwlagn_rx_handler_setup(struct iwl_priv *priv)
304 {
305 /* init calibration handlers */
306 priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] =
307 iwlagn_rx_calib_result;
308 priv->rx_handlers[CALIBRATION_COMPLETE_NOTIFICATION] =
309 iwlagn_rx_calib_complete;
310 priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
311 }
312
313 void iwlagn_setup_deferred_work(struct iwl_priv *priv)
314 {
315 /* in agn, the tx power calibration is done in uCode */
316 priv->disable_tx_power_cal = 1;
317 }
318
319 int iwlagn_hw_valid_rtc_data_addr(u32 addr)
320 {
321 return (addr >= IWLAGN_RTC_DATA_LOWER_BOUND) &&
322 (addr < IWLAGN_RTC_DATA_UPPER_BOUND);
323 }
324
325 int iwlagn_send_tx_power(struct iwl_priv *priv)
326 {
327 struct iwl5000_tx_power_dbm_cmd tx_power_cmd;
328 u8 tx_ant_cfg_cmd;
329
330 /* half dBm need to multiply */
331 tx_power_cmd.global_lmt = (s8)(2 * priv->tx_power_user_lmt);
332
333 if (priv->tx_power_lmt_in_half_dbm &&
334 priv->tx_power_lmt_in_half_dbm < tx_power_cmd.global_lmt) {
335 /*
336 * For the newer devices which using enhanced/extend tx power
337 * table in EEPROM, the format is in half dBm. driver need to
338 * convert to dBm format before report to mac80211.
339 * By doing so, there is a possibility of 1/2 dBm resolution
340 * lost. driver will perform "round-up" operation before
341 * reporting, but it will cause 1/2 dBm tx power over the
342 * regulatory limit. Perform the checking here, if the
343 * "tx_power_user_lmt" is higher than EEPROM value (in
344 * half-dBm format), lower the tx power based on EEPROM
345 */
346 tx_power_cmd.global_lmt = priv->tx_power_lmt_in_half_dbm;
347 }
348 tx_power_cmd.flags = IWL50_TX_POWER_NO_CLOSED;
349 tx_power_cmd.srv_chan_lmt = IWL50_TX_POWER_AUTO;
350
351 if (IWL_UCODE_API(priv->ucode_ver) == 1)
352 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD_V1;
353 else
354 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD;
355
356 return iwl_send_cmd_pdu_async(priv, tx_ant_cfg_cmd,
357 sizeof(tx_power_cmd), &tx_power_cmd,
358 NULL);
359 }
360
361 void iwlagn_temperature(struct iwl_priv *priv)
362 {
363 /* store temperature from statistics (in Celsius) */
364 priv->temperature =
365 le32_to_cpu(priv->_agn.statistics.general.temperature);
366 iwl_tt_handler(priv);
367 }
368
369 u16 iwlagn_eeprom_calib_version(struct iwl_priv *priv)
370 {
371 struct iwl_eeprom_calib_hdr {
372 u8 version;
373 u8 pa_type;
374 u16 voltage;
375 } *hdr;
376
377 hdr = (struct iwl_eeprom_calib_hdr *)iwl_eeprom_query_addr(priv,
378 EEPROM_CALIB_ALL);
379 return hdr->version;
380
381 }
382
383 /*
384 * EEPROM
385 */
386 static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address)
387 {
388 u16 offset = 0;
389
390 if ((address & INDIRECT_ADDRESS) == 0)
391 return address;
392
393 switch (address & INDIRECT_TYPE_MSK) {
394 case INDIRECT_HOST:
395 offset = iwl_eeprom_query16(priv, EEPROM_LINK_HOST);
396 break;
397 case INDIRECT_GENERAL:
398 offset = iwl_eeprom_query16(priv, EEPROM_LINK_GENERAL);
399 break;
400 case INDIRECT_REGULATORY:
401 offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY);
402 break;
403 case INDIRECT_CALIBRATION:
404 offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION);
405 break;
406 case INDIRECT_PROCESS_ADJST:
407 offset = iwl_eeprom_query16(priv, EEPROM_LINK_PROCESS_ADJST);
408 break;
409 case INDIRECT_OTHERS:
410 offset = iwl_eeprom_query16(priv, EEPROM_LINK_OTHERS);
411 break;
412 default:
413 IWL_ERR(priv, "illegal indirect type: 0x%X\n",
414 address & INDIRECT_TYPE_MSK);
415 break;
416 }
417
418 /* translate the offset from words to byte */
419 return (address & ADDRESS_MSK) + (offset << 1);
420 }
421
422 const u8 *iwlagn_eeprom_query_addr(const struct iwl_priv *priv,
423 size_t offset)
424 {
425 u32 address = eeprom_indirect_address(priv, offset);
426 BUG_ON(address >= priv->cfg->eeprom_size);
427 return &priv->eeprom[address];
428 }
429
430 struct iwl_mod_params iwlagn_mod_params = {
431 .amsdu_size_8K = 1,
432 .restart_fw = 1,
433 /* the rest are 0 by default */
434 };
435
436 void iwlagn_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
437 {
438 unsigned long flags;
439 int i;
440 spin_lock_irqsave(&rxq->lock, flags);
441 INIT_LIST_HEAD(&rxq->rx_free);
442 INIT_LIST_HEAD(&rxq->rx_used);
443 /* Fill the rx_used queue with _all_ of the Rx buffers */
444 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
445 /* In the reset function, these buffers may have been allocated
446 * to an SKB, so we need to unmap and free potential storage */
447 if (rxq->pool[i].page != NULL) {
448 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
449 PAGE_SIZE << priv->hw_params.rx_page_order,
450 PCI_DMA_FROMDEVICE);
451 __iwl_free_pages(priv, rxq->pool[i].page);
452 rxq->pool[i].page = NULL;
453 }
454 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
455 }
456
457 for (i = 0; i < RX_QUEUE_SIZE; i++)
458 rxq->queue[i] = NULL;
459
460 /* Set us so that we have processed and used all buffers, but have
461 * not restocked the Rx queue with fresh buffers */
462 rxq->read = rxq->write = 0;
463 rxq->write_actual = 0;
464 rxq->free_count = 0;
465 spin_unlock_irqrestore(&rxq->lock, flags);
466 }
467
468 int iwlagn_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
469 {
470 u32 rb_size;
471 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
472 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
473
474 if (!priv->cfg->use_isr_legacy)
475 rb_timeout = RX_RB_TIMEOUT;
476
477 if (priv->cfg->mod_params->amsdu_size_8K)
478 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
479 else
480 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
481
482 /* Stop Rx DMA */
483 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
484
485 /* Reset driver's Rx queue write index */
486 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
487
488 /* Tell device where to find RBD circular buffer in DRAM */
489 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
490 (u32)(rxq->bd_dma >> 8));
491
492 /* Tell device where in DRAM to update its Rx status */
493 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
494 rxq->rb_stts_dma >> 4);
495
496 /* Enable Rx DMA
497 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
498 * the credit mechanism in 5000 HW RX FIFO
499 * Direct rx interrupts to hosts
500 * Rx buffer size 4 or 8k
501 * RB timeout 0x10
502 * 256 RBDs
503 */
504 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
505 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
506 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
507 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
508 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
509 rb_size|
510 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
511 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
512
513 /* Set interrupt coalescing timer to default (2048 usecs) */
514 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
515
516 return 0;
517 }
518
519 int iwlagn_hw_nic_init(struct iwl_priv *priv)
520 {
521 unsigned long flags;
522 struct iwl_rx_queue *rxq = &priv->rxq;
523 int ret;
524
525 /* nic_init */
526 spin_lock_irqsave(&priv->lock, flags);
527 priv->cfg->ops->lib->apm_ops.init(priv);
528
529 /* Set interrupt coalescing calibration timer to default (512 usecs) */
530 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
531
532 spin_unlock_irqrestore(&priv->lock, flags);
533
534 ret = priv->cfg->ops->lib->apm_ops.set_pwr_src(priv, IWL_PWR_SRC_VMAIN);
535
536 priv->cfg->ops->lib->apm_ops.config(priv);
537
538 /* Allocate the RX queue, or reset if it is already allocated */
539 if (!rxq->bd) {
540 ret = iwl_rx_queue_alloc(priv);
541 if (ret) {
542 IWL_ERR(priv, "Unable to initialize Rx queue\n");
543 return -ENOMEM;
544 }
545 } else
546 iwlagn_rx_queue_reset(priv, rxq);
547
548 iwlagn_rx_replenish(priv);
549
550 iwlagn_rx_init(priv, rxq);
551
552 spin_lock_irqsave(&priv->lock, flags);
553
554 rxq->need_update = 1;
555 iwl_rx_queue_update_write_ptr(priv, rxq);
556
557 spin_unlock_irqrestore(&priv->lock, flags);
558
559 /* Allocate or reset and init all Tx and Command queues */
560 if (!priv->txq) {
561 ret = iwlagn_txq_ctx_alloc(priv);
562 if (ret)
563 return ret;
564 } else
565 iwlagn_txq_ctx_reset(priv);
566
567 set_bit(STATUS_INIT, &priv->status);
568
569 return 0;
570 }
571
572 /**
573 * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
574 */
575 static inline __le32 iwlagn_dma_addr2rbd_ptr(struct iwl_priv *priv,
576 dma_addr_t dma_addr)
577 {
578 return cpu_to_le32((u32)(dma_addr >> 8));
579 }
580
581 /**
582 * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool
583 *
584 * If there are slots in the RX queue that need to be restocked,
585 * and we have free pre-allocated buffers, fill the ranks as much
586 * as we can, pulling from rx_free.
587 *
588 * This moves the 'write' index forward to catch up with 'processed', and
589 * also updates the memory address in the firmware to reference the new
590 * target buffer.
591 */
592 void iwlagn_rx_queue_restock(struct iwl_priv *priv)
593 {
594 struct iwl_rx_queue *rxq = &priv->rxq;
595 struct list_head *element;
596 struct iwl_rx_mem_buffer *rxb;
597 unsigned long flags;
598
599 spin_lock_irqsave(&rxq->lock, flags);
600 while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
601 /* The overwritten rxb must be a used one */
602 rxb = rxq->queue[rxq->write];
603 BUG_ON(rxb && rxb->page);
604
605 /* Get next free Rx buffer, remove from free list */
606 element = rxq->rx_free.next;
607 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
608 list_del(element);
609
610 /* Point to Rx buffer via next RBD in circular buffer */
611 rxq->bd[rxq->write] = iwlagn_dma_addr2rbd_ptr(priv,
612 rxb->page_dma);
613 rxq->queue[rxq->write] = rxb;
614 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
615 rxq->free_count--;
616 }
617 spin_unlock_irqrestore(&rxq->lock, flags);
618 /* If the pre-allocated buffer pool is dropping low, schedule to
619 * refill it */
620 if (rxq->free_count <= RX_LOW_WATERMARK)
621 queue_work(priv->workqueue, &priv->rx_replenish);
622
623
624 /* If we've added more space for the firmware to place data, tell it.
625 * Increment device's write pointer in multiples of 8. */
626 if (rxq->write_actual != (rxq->write & ~0x7)) {
627 spin_lock_irqsave(&rxq->lock, flags);
628 rxq->need_update = 1;
629 spin_unlock_irqrestore(&rxq->lock, flags);
630 iwl_rx_queue_update_write_ptr(priv, rxq);
631 }
632 }
633
634 /**
635 * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free
636 *
637 * When moving to rx_free an SKB is allocated for the slot.
638 *
639 * Also restock the Rx queue via iwl_rx_queue_restock.
640 * This is called as a scheduled work item (except for during initialization)
641 */
642 void iwlagn_rx_allocate(struct iwl_priv *priv, gfp_t priority)
643 {
644 struct iwl_rx_queue *rxq = &priv->rxq;
645 struct list_head *element;
646 struct iwl_rx_mem_buffer *rxb;
647 struct page *page;
648 unsigned long flags;
649 gfp_t gfp_mask = priority;
650
651 while (1) {
652 spin_lock_irqsave(&rxq->lock, flags);
653 if (list_empty(&rxq->rx_used)) {
654 spin_unlock_irqrestore(&rxq->lock, flags);
655 return;
656 }
657 spin_unlock_irqrestore(&rxq->lock, flags);
658
659 if (rxq->free_count > RX_LOW_WATERMARK)
660 gfp_mask |= __GFP_NOWARN;
661
662 if (priv->hw_params.rx_page_order > 0)
663 gfp_mask |= __GFP_COMP;
664
665 /* Alloc a new receive buffer */
666 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
667 if (!page) {
668 if (net_ratelimit())
669 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
670 "order: %d\n",
671 priv->hw_params.rx_page_order);
672
673 if ((rxq->free_count <= RX_LOW_WATERMARK) &&
674 net_ratelimit())
675 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
676 priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL",
677 rxq->free_count);
678 /* We don't reschedule replenish work here -- we will
679 * call the restock method and if it still needs
680 * more buffers it will schedule replenish */
681 return;
682 }
683
684 spin_lock_irqsave(&rxq->lock, flags);
685
686 if (list_empty(&rxq->rx_used)) {
687 spin_unlock_irqrestore(&rxq->lock, flags);
688 __free_pages(page, priv->hw_params.rx_page_order);
689 return;
690 }
691 element = rxq->rx_used.next;
692 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
693 list_del(element);
694
695 spin_unlock_irqrestore(&rxq->lock, flags);
696
697 BUG_ON(rxb->page);
698 rxb->page = page;
699 /* Get physical address of the RB */
700 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
701 PAGE_SIZE << priv->hw_params.rx_page_order,
702 PCI_DMA_FROMDEVICE);
703 /* dma address must be no more than 36 bits */
704 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
705 /* and also 256 byte aligned! */
706 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
707
708 spin_lock_irqsave(&rxq->lock, flags);
709
710 list_add_tail(&rxb->list, &rxq->rx_free);
711 rxq->free_count++;
712 priv->alloc_rxb_page++;
713
714 spin_unlock_irqrestore(&rxq->lock, flags);
715 }
716 }
717
718 void iwlagn_rx_replenish(struct iwl_priv *priv)
719 {
720 unsigned long flags;
721
722 iwlagn_rx_allocate(priv, GFP_KERNEL);
723
724 spin_lock_irqsave(&priv->lock, flags);
725 iwlagn_rx_queue_restock(priv);
726 spin_unlock_irqrestore(&priv->lock, flags);
727 }
728
729 void iwlagn_rx_replenish_now(struct iwl_priv *priv)
730 {
731 iwlagn_rx_allocate(priv, GFP_ATOMIC);
732
733 iwlagn_rx_queue_restock(priv);
734 }
735
736 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
737 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
738 * This free routine walks the list of POOL entries and if SKB is set to
739 * non NULL it is unmapped and freed
740 */
741 void iwlagn_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
742 {
743 int i;
744 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
745 if (rxq->pool[i].page != NULL) {
746 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
747 PAGE_SIZE << priv->hw_params.rx_page_order,
748 PCI_DMA_FROMDEVICE);
749 __iwl_free_pages(priv, rxq->pool[i].page);
750 rxq->pool[i].page = NULL;
751 }
752 }
753
754 dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
755 rxq->bd_dma);
756 dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
757 rxq->rb_stts, rxq->rb_stts_dma);
758 rxq->bd = NULL;
759 rxq->rb_stts = NULL;
760 }
761
762 int iwlagn_rxq_stop(struct iwl_priv *priv)
763 {
764
765 /* stop Rx DMA */
766 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
767 iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
768 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
769
770 return 0;
771 }
772
773 int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band)
774 {
775 int idx = 0;
776 int band_offset = 0;
777
778 /* HT rate format: mac80211 wants an MCS number, which is just LSB */
779 if (rate_n_flags & RATE_MCS_HT_MSK) {
780 idx = (rate_n_flags & 0xff);
781 return idx;
782 /* Legacy rate format, search for match in table */
783 } else {
784 if (band == IEEE80211_BAND_5GHZ)
785 band_offset = IWL_FIRST_OFDM_RATE;
786 for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++)
787 if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
788 return idx - band_offset;
789 }
790
791 return -1;
792 }
793
794 /* Calc max signal level (dBm) among 3 possible receivers */
795 static inline int iwlagn_calc_rssi(struct iwl_priv *priv,
796 struct iwl_rx_phy_res *rx_resp)
797 {
798 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
799 }
800
801 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
802 {
803 u32 decrypt_out = 0;
804
805 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
806 RX_RES_STATUS_STATION_FOUND)
807 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
808 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
809
810 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
811
812 /* packet was not encrypted */
813 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
814 RX_RES_STATUS_SEC_TYPE_NONE)
815 return decrypt_out;
816
817 /* packet was encrypted with unknown alg */
818 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
819 RX_RES_STATUS_SEC_TYPE_ERR)
820 return decrypt_out;
821
822 /* decryption was not done in HW */
823 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
824 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
825 return decrypt_out;
826
827 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
828
829 case RX_RES_STATUS_SEC_TYPE_CCMP:
830 /* alg is CCM: check MIC only */
831 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
832 /* Bad MIC */
833 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
834 else
835 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
836
837 break;
838
839 case RX_RES_STATUS_SEC_TYPE_TKIP:
840 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
841 /* Bad TTAK */
842 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
843 break;
844 }
845 /* fall through if TTAK OK */
846 default:
847 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
848 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
849 else
850 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
851 break;
852 }
853
854 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
855 decrypt_in, decrypt_out);
856
857 return decrypt_out;
858 }
859
860 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
861 struct ieee80211_hdr *hdr,
862 u16 len,
863 u32 ampdu_status,
864 struct iwl_rx_mem_buffer *rxb,
865 struct ieee80211_rx_status *stats)
866 {
867 struct sk_buff *skb;
868 __le16 fc = hdr->frame_control;
869
870 /* We only process data packets if the interface is open */
871 if (unlikely(!priv->is_open)) {
872 IWL_DEBUG_DROP_LIMIT(priv,
873 "Dropping packet while interface is not open.\n");
874 return;
875 }
876
877 /* In case of HW accelerated crypto and bad decryption, drop */
878 if (!priv->cfg->mod_params->sw_crypto &&
879 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
880 return;
881
882 skb = dev_alloc_skb(128);
883 if (!skb) {
884 IWL_ERR(priv, "dev_alloc_skb failed\n");
885 return;
886 }
887
888 skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
889
890 iwl_update_stats(priv, false, fc, len);
891 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
892
893 ieee80211_rx(priv->hw, skb);
894 priv->alloc_rxb_page--;
895 rxb->page = NULL;
896 }
897
898 /* Called for REPLY_RX (legacy ABG frames), or
899 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
900 void iwlagn_rx_reply_rx(struct iwl_priv *priv,
901 struct iwl_rx_mem_buffer *rxb)
902 {
903 struct ieee80211_hdr *header;
904 struct ieee80211_rx_status rx_status;
905 struct iwl_rx_packet *pkt = rxb_addr(rxb);
906 struct iwl_rx_phy_res *phy_res;
907 __le32 rx_pkt_status;
908 struct iwl_rx_mpdu_res_start *amsdu;
909 u32 len;
910 u32 ampdu_status;
911 u32 rate_n_flags;
912
913 /**
914 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
915 * REPLY_RX: physical layer info is in this buffer
916 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
917 * command and cached in priv->last_phy_res
918 *
919 * Here we set up local variables depending on which command is
920 * received.
921 */
922 if (pkt->hdr.cmd == REPLY_RX) {
923 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
924 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
925 + phy_res->cfg_phy_cnt);
926
927 len = le16_to_cpu(phy_res->byte_count);
928 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
929 phy_res->cfg_phy_cnt + len);
930 ampdu_status = le32_to_cpu(rx_pkt_status);
931 } else {
932 if (!priv->_agn.last_phy_res_valid) {
933 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
934 return;
935 }
936 phy_res = &priv->_agn.last_phy_res;
937 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
938 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
939 len = le16_to_cpu(amsdu->byte_count);
940 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
941 ampdu_status = iwlagn_translate_rx_status(priv,
942 le32_to_cpu(rx_pkt_status));
943 }
944
945 if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
946 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
947 phy_res->cfg_phy_cnt);
948 return;
949 }
950
951 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
952 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
953 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
954 le32_to_cpu(rx_pkt_status));
955 return;
956 }
957
958 /* This will be used in several places later */
959 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
960
961 /* rx_status carries information about the packet to mac80211 */
962 rx_status.mactime = le64_to_cpu(phy_res->timestamp);
963 rx_status.freq =
964 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
965 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
966 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
967 rx_status.rate_idx =
968 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
969 rx_status.flag = 0;
970
971 /* TSF isn't reliable. In order to allow smooth user experience,
972 * this W/A doesn't propagate it to the mac80211 */
973 /*rx_status.flag |= RX_FLAG_TSFT;*/
974
975 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
976
977 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
978 rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
979
980 iwl_dbg_log_rx_data_frame(priv, len, header);
981 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
982 rx_status.signal, (unsigned long long)rx_status.mactime);
983
984 /*
985 * "antenna number"
986 *
987 * It seems that the antenna field in the phy flags value
988 * is actually a bit field. This is undefined by radiotap,
989 * it wants an actual antenna number but I always get "7"
990 * for most legacy frames I receive indicating that the
991 * same frame was received on all three RX chains.
992 *
993 * I think this field should be removed in favor of a
994 * new 802.11n radiotap field "RX chains" that is defined
995 * as a bitmask.
996 */
997 rx_status.antenna =
998 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
999 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1000
1001 /* set the preamble flag if appropriate */
1002 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1003 rx_status.flag |= RX_FLAG_SHORTPRE;
1004
1005 /* Set up the HT phy flags */
1006 if (rate_n_flags & RATE_MCS_HT_MSK)
1007 rx_status.flag |= RX_FLAG_HT;
1008 if (rate_n_flags & RATE_MCS_HT40_MSK)
1009 rx_status.flag |= RX_FLAG_40MHZ;
1010 if (rate_n_flags & RATE_MCS_SGI_MSK)
1011 rx_status.flag |= RX_FLAG_SHORT_GI;
1012
1013 iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1014 rxb, &rx_status);
1015 }
1016
1017 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1018 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1019 void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
1020 struct iwl_rx_mem_buffer *rxb)
1021 {
1022 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1023 priv->_agn.last_phy_res_valid = true;
1024 memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
1025 sizeof(struct iwl_rx_phy_res));
1026 }
1027
1028 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
1029 struct ieee80211_vif *vif,
1030 enum ieee80211_band band,
1031 struct iwl_scan_channel *scan_ch)
1032 {
1033 const struct ieee80211_supported_band *sband;
1034 u16 passive_dwell = 0;
1035 u16 active_dwell = 0;
1036 int added = 0;
1037 u16 channel = 0;
1038
1039 sband = iwl_get_hw_mode(priv, band);
1040 if (!sband) {
1041 IWL_ERR(priv, "invalid band\n");
1042 return added;
1043 }
1044
1045 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
1046 passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1047
1048 if (passive_dwell <= active_dwell)
1049 passive_dwell = active_dwell + 1;
1050
1051 channel = iwl_get_single_channel_number(priv, band);
1052 if (channel) {
1053 scan_ch->channel = cpu_to_le16(channel);
1054 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1055 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1056 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1057 /* Set txpower levels to defaults */
1058 scan_ch->dsp_atten = 110;
1059 if (band == IEEE80211_BAND_5GHZ)
1060 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1061 else
1062 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1063 added++;
1064 } else
1065 IWL_ERR(priv, "no valid channel found\n");
1066 return added;
1067 }
1068
1069 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
1070 struct ieee80211_vif *vif,
1071 enum ieee80211_band band,
1072 u8 is_active, u8 n_probes,
1073 struct iwl_scan_channel *scan_ch)
1074 {
1075 struct ieee80211_channel *chan;
1076 const struct ieee80211_supported_band *sband;
1077 const struct iwl_channel_info *ch_info;
1078 u16 passive_dwell = 0;
1079 u16 active_dwell = 0;
1080 int added, i;
1081 u16 channel;
1082
1083 sband = iwl_get_hw_mode(priv, band);
1084 if (!sband)
1085 return 0;
1086
1087 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
1088 passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1089
1090 if (passive_dwell <= active_dwell)
1091 passive_dwell = active_dwell + 1;
1092
1093 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
1094 chan = priv->scan_request->channels[i];
1095
1096 if (chan->band != band)
1097 continue;
1098
1099 channel = ieee80211_frequency_to_channel(chan->center_freq);
1100 scan_ch->channel = cpu_to_le16(channel);
1101
1102 ch_info = iwl_get_channel_info(priv, band, channel);
1103 if (!is_channel_valid(ch_info)) {
1104 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
1105 channel);
1106 continue;
1107 }
1108
1109 if (!is_active || is_channel_passive(ch_info) ||
1110 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
1111 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1112 else
1113 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
1114
1115 if (n_probes)
1116 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
1117
1118 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1119 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1120
1121 /* Set txpower levels to defaults */
1122 scan_ch->dsp_atten = 110;
1123
1124 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
1125 * power level:
1126 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
1127 */
1128 if (band == IEEE80211_BAND_5GHZ)
1129 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1130 else
1131 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1132
1133 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
1134 channel, le32_to_cpu(scan_ch->type),
1135 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1136 "ACTIVE" : "PASSIVE",
1137 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1138 active_dwell : passive_dwell);
1139
1140 scan_ch++;
1141 added++;
1142 }
1143
1144 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
1145 return added;
1146 }
1147
1148 void iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
1149 {
1150 struct iwl_host_cmd cmd = {
1151 .id = REPLY_SCAN_CMD,
1152 .len = sizeof(struct iwl_scan_cmd),
1153 .flags = CMD_SIZE_HUGE,
1154 };
1155 struct iwl_scan_cmd *scan;
1156 struct ieee80211_conf *conf = NULL;
1157 u32 rate_flags = 0;
1158 u16 cmd_len;
1159 u16 rx_chain = 0;
1160 enum ieee80211_band band;
1161 u8 n_probes = 0;
1162 u8 rx_ant = priv->hw_params.valid_rx_ant;
1163 u8 rate;
1164 bool is_active = false;
1165 int chan_mod;
1166 u8 active_chains;
1167 u8 scan_tx_antennas = priv->hw_params.valid_tx_ant;
1168
1169 conf = ieee80211_get_hw_conf(priv->hw);
1170
1171 cancel_delayed_work(&priv->scan_check);
1172
1173 if (!iwl_is_ready(priv)) {
1174 IWL_WARN(priv, "request scan called when driver not ready.\n");
1175 goto done;
1176 }
1177
1178 /* Make sure the scan wasn't canceled before this queued work
1179 * was given the chance to run... */
1180 if (!test_bit(STATUS_SCANNING, &priv->status))
1181 goto done;
1182
1183 /* This should never be called or scheduled if there is currently
1184 * a scan active in the hardware. */
1185 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
1186 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
1187 "Ignoring second request.\n");
1188 goto done;
1189 }
1190
1191 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
1192 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
1193 goto done;
1194 }
1195
1196 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
1197 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
1198 goto done;
1199 }
1200
1201 if (iwl_is_rfkill(priv)) {
1202 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
1203 goto done;
1204 }
1205
1206 if (!test_bit(STATUS_READY, &priv->status)) {
1207 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
1208 goto done;
1209 }
1210
1211 if (!priv->scan_cmd) {
1212 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
1213 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
1214 if (!priv->scan_cmd) {
1215 IWL_DEBUG_SCAN(priv,
1216 "fail to allocate memory for scan\n");
1217 goto done;
1218 }
1219 }
1220 scan = priv->scan_cmd;
1221 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
1222
1223 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
1224 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
1225
1226 if (iwl_is_associated(priv)) {
1227 u16 interval = 0;
1228 u32 extra;
1229 u32 suspend_time = 100;
1230 u32 scan_suspend_time = 100;
1231 unsigned long flags;
1232
1233 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
1234 spin_lock_irqsave(&priv->lock, flags);
1235 interval = vif ? vif->bss_conf.beacon_int : 0;
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237
1238 scan->suspend_time = 0;
1239 scan->max_out_time = cpu_to_le32(200 * 1024);
1240 if (!interval)
1241 interval = suspend_time;
1242
1243 extra = (suspend_time / interval) << 22;
1244 scan_suspend_time = (extra |
1245 ((suspend_time % interval) * 1024));
1246 scan->suspend_time = cpu_to_le32(scan_suspend_time);
1247 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
1248 scan_suspend_time, interval);
1249 }
1250
1251 if (priv->is_internal_short_scan) {
1252 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
1253 } else if (priv->scan_request->n_ssids) {
1254 int i, p = 0;
1255 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
1256 for (i = 0; i < priv->scan_request->n_ssids; i++) {
1257 /* always does wildcard anyway */
1258 if (!priv->scan_request->ssids[i].ssid_len)
1259 continue;
1260 scan->direct_scan[p].id = WLAN_EID_SSID;
1261 scan->direct_scan[p].len =
1262 priv->scan_request->ssids[i].ssid_len;
1263 memcpy(scan->direct_scan[p].ssid,
1264 priv->scan_request->ssids[i].ssid,
1265 priv->scan_request->ssids[i].ssid_len);
1266 n_probes++;
1267 p++;
1268 }
1269 is_active = true;
1270 } else
1271 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
1272
1273 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
1274 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
1275 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
1276
1277 switch (priv->scan_band) {
1278 case IEEE80211_BAND_2GHZ:
1279 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
1280 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
1281 >> RXON_FLG_CHANNEL_MODE_POS;
1282 if (chan_mod == CHANNEL_MODE_PURE_40) {
1283 rate = IWL_RATE_6M_PLCP;
1284 } else {
1285 rate = IWL_RATE_1M_PLCP;
1286 rate_flags = RATE_MCS_CCK_MSK;
1287 }
1288 scan->good_CRC_th = IWL_GOOD_CRC_TH_DISABLED;
1289 break;
1290 case IEEE80211_BAND_5GHZ:
1291 rate = IWL_RATE_6M_PLCP;
1292 /*
1293 * If active scanning is requested but a certain channel is
1294 * marked passive, we can do active scanning if we detect
1295 * transmissions.
1296 *
1297 * There is an issue with some firmware versions that triggers
1298 * a sysassert on a "good CRC threshold" of zero (== disabled),
1299 * on a radar channel even though this means that we should NOT
1300 * send probes.
1301 *
1302 * The "good CRC threshold" is the number of frames that we
1303 * need to receive during our dwell time on a channel before
1304 * sending out probes -- setting this to a huge value will
1305 * mean we never reach it, but at the same time work around
1306 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
1307 * here instead of IWL_GOOD_CRC_TH_DISABLED.
1308 */
1309 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
1310 IWL_GOOD_CRC_TH_NEVER;
1311 break;
1312 default:
1313 IWL_WARN(priv, "Invalid scan band count\n");
1314 goto done;
1315 }
1316
1317 band = priv->scan_band;
1318
1319 if (priv->cfg->scan_rx_antennas[band])
1320 rx_ant = priv->cfg->scan_rx_antennas[band];
1321
1322 if (priv->cfg->scan_tx_antennas[band])
1323 scan_tx_antennas = priv->cfg->scan_tx_antennas[band];
1324
1325 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band],
1326 scan_tx_antennas);
1327 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
1328 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
1329
1330 /* In power save mode use one chain, otherwise use all chains */
1331 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
1332 /* rx_ant has been set to all valid chains previously */
1333 active_chains = rx_ant &
1334 ((u8)(priv->chain_noise_data.active_chains));
1335 if (!active_chains)
1336 active_chains = rx_ant;
1337
1338 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
1339 priv->chain_noise_data.active_chains);
1340
1341 rx_ant = first_antenna(active_chains);
1342 }
1343 /* MIMO is not used here, but value is required */
1344 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
1345 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
1346 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
1347 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
1348 scan->rx_chain = cpu_to_le16(rx_chain);
1349 if (!priv->is_internal_short_scan) {
1350 cmd_len = iwl_fill_probe_req(priv,
1351 (struct ieee80211_mgmt *)scan->data,
1352 vif->addr,
1353 priv->scan_request->ie,
1354 priv->scan_request->ie_len,
1355 IWL_MAX_SCAN_SIZE - sizeof(*scan));
1356 } else {
1357 /* use bcast addr, will not be transmitted but must be valid */
1358 cmd_len = iwl_fill_probe_req(priv,
1359 (struct ieee80211_mgmt *)scan->data,
1360 iwl_bcast_addr, NULL, 0,
1361 IWL_MAX_SCAN_SIZE - sizeof(*scan));
1362
1363 }
1364 scan->tx_cmd.len = cpu_to_le16(cmd_len);
1365
1366 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
1367 RXON_FILTER_BCON_AWARE_MSK);
1368
1369 if (priv->is_internal_short_scan) {
1370 scan->channel_count =
1371 iwl_get_single_channel_for_scan(priv, vif, band,
1372 (void *)&scan->data[le16_to_cpu(
1373 scan->tx_cmd.len)]);
1374 } else {
1375 scan->channel_count =
1376 iwl_get_channels_for_scan(priv, vif, band,
1377 is_active, n_probes,
1378 (void *)&scan->data[le16_to_cpu(
1379 scan->tx_cmd.len)]);
1380 }
1381 if (scan->channel_count == 0) {
1382 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
1383 goto done;
1384 }
1385
1386 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
1387 scan->channel_count * sizeof(struct iwl_scan_channel);
1388 cmd.data = scan;
1389 scan->len = cpu_to_le16(cmd.len);
1390
1391 set_bit(STATUS_SCAN_HW, &priv->status);
1392 if (iwl_send_cmd_sync(priv, &cmd))
1393 goto done;
1394
1395 queue_delayed_work(priv->workqueue, &priv->scan_check,
1396 IWL_SCAN_CHECK_WATCHDOG);
1397
1398 return;
1399
1400 done:
1401 /* Cannot perform scan. Make sure we clear scanning
1402 * bits from status so next scan request can be performed.
1403 * If we don't clear scanning status bit here all next scan
1404 * will fail
1405 */
1406 clear_bit(STATUS_SCAN_HW, &priv->status);
1407 clear_bit(STATUS_SCANNING, &priv->status);
1408 /* inform mac80211 scan aborted */
1409 queue_work(priv->workqueue, &priv->scan_completed);
1410 }
1411
1412 int iwlagn_manage_ibss_station(struct iwl_priv *priv,
1413 struct ieee80211_vif *vif, bool add)
1414 {
1415 struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1416
1417 if (add)
1418 return iwl_add_bssid_station(priv, vif->bss_conf.bssid, true,
1419 &vif_priv->ibss_bssid_sta_id);
1420 return iwl_remove_station(priv, vif_priv->ibss_bssid_sta_id,
1421 vif->bss_conf.bssid);
1422 }
1423
1424 void iwl_free_tfds_in_queue(struct iwl_priv *priv,
1425 int sta_id, int tid, int freed)
1426 {
1427 WARN_ON(!spin_is_locked(&priv->sta_lock));
1428
1429 if (priv->stations[sta_id].tid[tid].tfds_in_queue >= freed)
1430 priv->stations[sta_id].tid[tid].tfds_in_queue -= freed;
1431 else {
1432 IWL_DEBUG_TX(priv, "free more than tfds_in_queue (%u:%d)\n",
1433 priv->stations[sta_id].tid[tid].tfds_in_queue,
1434 freed);
1435 priv->stations[sta_id].tid[tid].tfds_in_queue = 0;
1436 }
1437 }
Linux kernel - Deliverables
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