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Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-lib.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-agn-lib.c1530
1 files changed, 1530 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
new file mode 100644
index 000000000000..1004cfc403b1
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+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -0,0 +1,1530 @@
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
43static 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
49static 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[0]);
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 int start = agg->start_idx;
97
98 /* Construct bit-map of pending frames within Tx window */
99 for (i = 0; i < agg->frame_count; i++) {
100 u16 sc;
101 status = le16_to_cpu(frame_status[i].status);
102 seq = le16_to_cpu(frame_status[i].sequence);
103 idx = SEQ_TO_INDEX(seq);
104 txq_id = SEQ_TO_QUEUE(seq);
105
106 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
107 AGG_TX_STATE_ABORT_MSK))
108 continue;
109
110 IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, txq_id=%d idx=%d\n",
111 agg->frame_count, txq_id, idx);
112
113 hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
114 if (!hdr) {
115 IWL_ERR(priv,
116 "BUG_ON idx doesn't point to valid skb"
117 " idx=%d, txq_id=%d\n", idx, txq_id);
118 return -1;
119 }
120
121 sc = le16_to_cpu(hdr->seq_ctrl);
122 if (idx != (SEQ_TO_SN(sc) & 0xff)) {
123 IWL_ERR(priv,
124 "BUG_ON idx doesn't match seq control"
125 " idx=%d, seq_idx=%d, seq=%d\n",
126 idx, SEQ_TO_SN(sc),
127 hdr->seq_ctrl);
128 return -1;
129 }
130
131 IWL_DEBUG_TX_REPLY(priv, "AGG Frame i=%d idx %d seq=%d\n",
132 i, idx, SEQ_TO_SN(sc));
133
134 sh = idx - start;
135 if (sh > 64) {
136 sh = (start - idx) + 0xff;
137 bitmap = bitmap << sh;
138 sh = 0;
139 start = idx;
140 } else if (sh < -64)
141 sh = 0xff - (start - idx);
142 else if (sh < 0) {
143 sh = start - idx;
144 start = idx;
145 bitmap = bitmap << sh;
146 sh = 0;
147 }
148 bitmap |= 1ULL << sh;
149 IWL_DEBUG_TX_REPLY(priv, "start=%d bitmap=0x%llx\n",
150 start, (unsigned long long)bitmap);
151 }
152
153 agg->bitmap = bitmap;
154 agg->start_idx = start;
155 IWL_DEBUG_TX_REPLY(priv, "Frames %d start_idx=%d bitmap=0x%llx\n",
156 agg->frame_count, agg->start_idx,
157 (unsigned long long)agg->bitmap);
158
159 if (bitmap)
160 agg->wait_for_ba = 1;
161 }
162 return 0;
163}
164
165void iwl_check_abort_status(struct iwl_priv *priv,
166 u8 frame_count, u32 status)
167{
168 if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
169 IWL_ERR(priv, "TODO: Implement Tx flush command!!!\n");
170 }
171}
172
173static void iwlagn_rx_reply_tx(struct iwl_priv *priv,
174 struct iwl_rx_mem_buffer *rxb)
175{
176 struct iwl_rx_packet *pkt = rxb_addr(rxb);
177 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
178 int txq_id = SEQ_TO_QUEUE(sequence);
179 int index = SEQ_TO_INDEX(sequence);
180 struct iwl_tx_queue *txq = &priv->txq[txq_id];
181 struct ieee80211_tx_info *info;
182 struct iwl5000_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
183 u32 status = le16_to_cpu(tx_resp->status.status);
184 int tid;
185 int sta_id;
186 int freed;
187
188 if ((index >= txq->q.n_bd) || (iwl_queue_used(&txq->q, index) == 0)) {
189 IWL_ERR(priv, "Read index for DMA queue txq_id (%d) index %d "
190 "is out of range [0-%d] %d %d\n", txq_id,
191 index, txq->q.n_bd, txq->q.write_ptr,
192 txq->q.read_ptr);
193 return;
194 }
195
196 info = IEEE80211_SKB_CB(txq->txb[txq->q.read_ptr].skb[0]);
197 memset(&info->status, 0, sizeof(info->status));
198
199 tid = (tx_resp->ra_tid & IWL50_TX_RES_TID_MSK) >> IWL50_TX_RES_TID_POS;
200 sta_id = (tx_resp->ra_tid & IWL50_TX_RES_RA_MSK) >> IWL50_TX_RES_RA_POS;
201
202 if (txq->sched_retry) {
203 const u32 scd_ssn = iwlagn_get_scd_ssn(tx_resp);
204 struct iwl_ht_agg *agg = NULL;
205
206 agg = &priv->stations[sta_id].tid[tid].agg;
207
208 iwlagn_tx_status_reply_tx(priv, agg, tx_resp, txq_id, index);
209
210 /* check if BAR is needed */
211 if ((tx_resp->frame_count == 1) && !iwl_is_tx_success(status))
212 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
213
214 if (txq->q.read_ptr != (scd_ssn & 0xff)) {
215 index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
216 IWL_DEBUG_TX_REPLY(priv, "Retry scheduler reclaim "
217 "scd_ssn=%d idx=%d txq=%d swq=%d\n",
218 scd_ssn , index, txq_id, txq->swq_id);
219
220 freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
221 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
222
223 if (priv->mac80211_registered &&
224 (iwl_queue_space(&txq->q) > txq->q.low_mark) &&
225 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)) {
226 if (agg->state == IWL_AGG_OFF)
227 iwl_wake_queue(priv, txq_id);
228 else
229 iwl_wake_queue(priv, txq->swq_id);
230 }
231 }
232 } else {
233 BUG_ON(txq_id != txq->swq_id);
234
235 info->status.rates[0].count = tx_resp->failure_frame + 1;
236 info->flags |= iwl_tx_status_to_mac80211(status);
237 iwlagn_hwrate_to_tx_control(priv,
238 le32_to_cpu(tx_resp->rate_n_flags),
239 info);
240
241 IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) rate_n_flags "
242 "0x%x retries %d\n",
243 txq_id,
244 iwl_get_tx_fail_reason(status), status,
245 le32_to_cpu(tx_resp->rate_n_flags),
246 tx_resp->failure_frame);
247
248 freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
249 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
250
251 if (priv->mac80211_registered &&
252 (iwl_queue_space(&txq->q) > txq->q.low_mark))
253 iwl_wake_queue(priv, txq_id);
254 }
255
256 iwlagn_txq_check_empty(priv, sta_id, tid, txq_id);
257
258 iwl_check_abort_status(priv, tx_resp->frame_count, status);
259}
260
261void iwlagn_rx_handler_setup(struct iwl_priv *priv)
262{
263 /* init calibration handlers */
264 priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] =
265 iwlagn_rx_calib_result;
266 priv->rx_handlers[CALIBRATION_COMPLETE_NOTIFICATION] =
267 iwlagn_rx_calib_complete;
268 priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
269}
270
271void iwlagn_setup_deferred_work(struct iwl_priv *priv)
272{
273 /* in agn, the tx power calibration is done in uCode */
274 priv->disable_tx_power_cal = 1;
275}
276
277int iwlagn_hw_valid_rtc_data_addr(u32 addr)
278{
279 return (addr >= IWLAGN_RTC_DATA_LOWER_BOUND) &&
280 (addr < IWLAGN_RTC_DATA_UPPER_BOUND);
281}
282
283int iwlagn_send_tx_power(struct iwl_priv *priv)
284{
285 struct iwl5000_tx_power_dbm_cmd tx_power_cmd;
286 u8 tx_ant_cfg_cmd;
287
288 /* half dBm need to multiply */
289 tx_power_cmd.global_lmt = (s8)(2 * priv->tx_power_user_lmt);
290
291 if (priv->tx_power_lmt_in_half_dbm &&
292 priv->tx_power_lmt_in_half_dbm < tx_power_cmd.global_lmt) {
293 /*
294 * For the newer devices which using enhanced/extend tx power
295 * table in EEPROM, the format is in half dBm. driver need to
296 * convert to dBm format before report to mac80211.
297 * By doing so, there is a possibility of 1/2 dBm resolution
298 * lost. driver will perform "round-up" operation before
299 * reporting, but it will cause 1/2 dBm tx power over the
300 * regulatory limit. Perform the checking here, if the
301 * "tx_power_user_lmt" is higher than EEPROM value (in
302 * half-dBm format), lower the tx power based on EEPROM
303 */
304 tx_power_cmd.global_lmt = priv->tx_power_lmt_in_half_dbm;
305 }
306 tx_power_cmd.flags = IWL50_TX_POWER_NO_CLOSED;
307 tx_power_cmd.srv_chan_lmt = IWL50_TX_POWER_AUTO;
308
309 if (IWL_UCODE_API(priv->ucode_ver) == 1)
310 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD_V1;
311 else
312 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD;
313
314 return iwl_send_cmd_pdu_async(priv, tx_ant_cfg_cmd,
315 sizeof(tx_power_cmd), &tx_power_cmd,
316 NULL);
317}
318
319void iwlagn_temperature(struct iwl_priv *priv)
320{
321 /* store temperature from statistics (in Celsius) */
322 priv->temperature = le32_to_cpu(priv->statistics.general.temperature);
323 iwl_tt_handler(priv);
324}
325
326u16 iwlagn_eeprom_calib_version(struct iwl_priv *priv)
327{
328 struct iwl_eeprom_calib_hdr {
329 u8 version;
330 u8 pa_type;
331 u16 voltage;
332 } *hdr;
333
334 hdr = (struct iwl_eeprom_calib_hdr *)iwl_eeprom_query_addr(priv,
335 EEPROM_CALIB_ALL);
336 return hdr->version;
337
338}
339
340/*
341 * EEPROM
342 */
343static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address)
344{
345 u16 offset = 0;
346
347 if ((address & INDIRECT_ADDRESS) == 0)
348 return address;
349
350 switch (address & INDIRECT_TYPE_MSK) {
351 case INDIRECT_HOST:
352 offset = iwl_eeprom_query16(priv, EEPROM_LINK_HOST);
353 break;
354 case INDIRECT_GENERAL:
355 offset = iwl_eeprom_query16(priv, EEPROM_LINK_GENERAL);
356 break;
357 case INDIRECT_REGULATORY:
358 offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY);
359 break;
360 case INDIRECT_CALIBRATION:
361 offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION);
362 break;
363 case INDIRECT_PROCESS_ADJST:
364 offset = iwl_eeprom_query16(priv, EEPROM_LINK_PROCESS_ADJST);
365 break;
366 case INDIRECT_OTHERS:
367 offset = iwl_eeprom_query16(priv, EEPROM_LINK_OTHERS);
368 break;
369 default:
370 IWL_ERR(priv, "illegal indirect type: 0x%X\n",
371 address & INDIRECT_TYPE_MSK);
372 break;
373 }
374
375 /* translate the offset from words to byte */
376 return (address & ADDRESS_MSK) + (offset << 1);
377}
378
379const u8 *iwlagn_eeprom_query_addr(const struct iwl_priv *priv,
380 size_t offset)
381{
382 u32 address = eeprom_indirect_address(priv, offset);
383 BUG_ON(address >= priv->cfg->eeprom_size);
384 return &priv->eeprom[address];
385}
386
387struct iwl_mod_params iwlagn_mod_params = {
388 .amsdu_size_8K = 1,
389 .restart_fw = 1,
390 /* the rest are 0 by default */
391};
392
393void iwlagn_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
394{
395 unsigned long flags;
396 int i;
397 spin_lock_irqsave(&rxq->lock, flags);
398 INIT_LIST_HEAD(&rxq->rx_free);
399 INIT_LIST_HEAD(&rxq->rx_used);
400 /* Fill the rx_used queue with _all_ of the Rx buffers */
401 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
402 /* In the reset function, these buffers may have been allocated
403 * to an SKB, so we need to unmap and free potential storage */
404 if (rxq->pool[i].page != NULL) {
405 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
406 PAGE_SIZE << priv->hw_params.rx_page_order,
407 PCI_DMA_FROMDEVICE);
408 __iwl_free_pages(priv, rxq->pool[i].page);
409 rxq->pool[i].page = NULL;
410 }
411 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
412 }
413
414 for (i = 0; i < RX_QUEUE_SIZE; i++)
415 rxq->queue[i] = NULL;
416
417 /* Set us so that we have processed and used all buffers, but have
418 * not restocked the Rx queue with fresh buffers */
419 rxq->read = rxq->write = 0;
420 rxq->write_actual = 0;
421 rxq->free_count = 0;
422 spin_unlock_irqrestore(&rxq->lock, flags);
423}
424
425int iwlagn_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
426{
427 u32 rb_size;
428 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
429 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
430
431 if (!priv->cfg->use_isr_legacy)
432 rb_timeout = RX_RB_TIMEOUT;
433
434 if (priv->cfg->mod_params->amsdu_size_8K)
435 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
436 else
437 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
438
439 /* Stop Rx DMA */
440 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
441
442 /* Reset driver's Rx queue write index */
443 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
444
445 /* Tell device where to find RBD circular buffer in DRAM */
446 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
447 (u32)(rxq->dma_addr >> 8));
448
449 /* Tell device where in DRAM to update its Rx status */
450 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
451 rxq->rb_stts_dma >> 4);
452
453 /* Enable Rx DMA
454 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
455 * the credit mechanism in 5000 HW RX FIFO
456 * Direct rx interrupts to hosts
457 * Rx buffer size 4 or 8k
458 * RB timeout 0x10
459 * 256 RBDs
460 */
461 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
462 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
463 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
464 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
465 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
466 rb_size|
467 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
468 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
469
470 /* Set interrupt coalescing timer to default (2048 usecs) */
471 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
472
473 return 0;
474}
475
476int iwlagn_hw_nic_init(struct iwl_priv *priv)
477{
478 unsigned long flags;
479 struct iwl_rx_queue *rxq = &priv->rxq;
480 int ret;
481
482 /* nic_init */
483 spin_lock_irqsave(&priv->lock, flags);
484 priv->cfg->ops->lib->apm_ops.init(priv);
485
486 /* Set interrupt coalescing calibration timer to default (512 usecs) */
487 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
488
489 spin_unlock_irqrestore(&priv->lock, flags);
490
491 ret = priv->cfg->ops->lib->apm_ops.set_pwr_src(priv, IWL_PWR_SRC_VMAIN);
492
493 priv->cfg->ops->lib->apm_ops.config(priv);
494
495 /* Allocate the RX queue, or reset if it is already allocated */
496 if (!rxq->bd) {
497 ret = iwl_rx_queue_alloc(priv);
498 if (ret) {
499 IWL_ERR(priv, "Unable to initialize Rx queue\n");
500 return -ENOMEM;
501 }
502 } else
503 iwlagn_rx_queue_reset(priv, rxq);
504
505 iwlagn_rx_replenish(priv);
506
507 iwlagn_rx_init(priv, rxq);
508
509 spin_lock_irqsave(&priv->lock, flags);
510
511 rxq->need_update = 1;
512 iwl_rx_queue_update_write_ptr(priv, rxq);
513
514 spin_unlock_irqrestore(&priv->lock, flags);
515
516 /* Allocate or reset and init all Tx and Command queues */
517 if (!priv->txq) {
518 ret = iwlagn_txq_ctx_alloc(priv);
519 if (ret)
520 return ret;
521 } else
522 iwlagn_txq_ctx_reset(priv);
523
524 set_bit(STATUS_INIT, &priv->status);
525
526 return 0;
527}
528
529/**
530 * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
531 */
532static inline __le32 iwlagn_dma_addr2rbd_ptr(struct iwl_priv *priv,
533 dma_addr_t dma_addr)
534{
535 return cpu_to_le32((u32)(dma_addr >> 8));
536}
537
538/**
539 * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool
540 *
541 * If there are slots in the RX queue that need to be restocked,
542 * and we have free pre-allocated buffers, fill the ranks as much
543 * as we can, pulling from rx_free.
544 *
545 * This moves the 'write' index forward to catch up with 'processed', and
546 * also updates the memory address in the firmware to reference the new
547 * target buffer.
548 */
549void iwlagn_rx_queue_restock(struct iwl_priv *priv)
550{
551 struct iwl_rx_queue *rxq = &priv->rxq;
552 struct list_head *element;
553 struct iwl_rx_mem_buffer *rxb;
554 unsigned long flags;
555
556 spin_lock_irqsave(&rxq->lock, flags);
557 while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
558 /* The overwritten rxb must be a used one */
559 rxb = rxq->queue[rxq->write];
560 BUG_ON(rxb && rxb->page);
561
562 /* Get next free Rx buffer, remove from free list */
563 element = rxq->rx_free.next;
564 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
565 list_del(element);
566
567 /* Point to Rx buffer via next RBD in circular buffer */
568 rxq->bd[rxq->write] = iwlagn_dma_addr2rbd_ptr(priv,
569 rxb->page_dma);
570 rxq->queue[rxq->write] = rxb;
571 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
572 rxq->free_count--;
573 }
574 spin_unlock_irqrestore(&rxq->lock, flags);
575 /* If the pre-allocated buffer pool is dropping low, schedule to
576 * refill it */
577 if (rxq->free_count <= RX_LOW_WATERMARK)
578 queue_work(priv->workqueue, &priv->rx_replenish);
579
580
581 /* If we've added more space for the firmware to place data, tell it.
582 * Increment device's write pointer in multiples of 8. */
583 if (rxq->write_actual != (rxq->write & ~0x7)) {
584 spin_lock_irqsave(&rxq->lock, flags);
585 rxq->need_update = 1;
586 spin_unlock_irqrestore(&rxq->lock, flags);
587 iwl_rx_queue_update_write_ptr(priv, rxq);
588 }
589}
590
591/**
592 * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free
593 *
594 * When moving to rx_free an SKB is allocated for the slot.
595 *
596 * Also restock the Rx queue via iwl_rx_queue_restock.
597 * This is called as a scheduled work item (except for during initialization)
598 */
599void iwlagn_rx_allocate(struct iwl_priv *priv, gfp_t priority)
600{
601 struct iwl_rx_queue *rxq = &priv->rxq;
602 struct list_head *element;
603 struct iwl_rx_mem_buffer *rxb;
604 struct page *page;
605 unsigned long flags;
606 gfp_t gfp_mask = priority;
607
608 while (1) {
609 spin_lock_irqsave(&rxq->lock, flags);
610 if (list_empty(&rxq->rx_used)) {
611 spin_unlock_irqrestore(&rxq->lock, flags);
612 return;
613 }
614 spin_unlock_irqrestore(&rxq->lock, flags);
615
616 if (rxq->free_count > RX_LOW_WATERMARK)
617 gfp_mask |= __GFP_NOWARN;
618
619 if (priv->hw_params.rx_page_order > 0)
620 gfp_mask |= __GFP_COMP;
621
622 /* Alloc a new receive buffer */
623 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
624 if (!page) {
625 if (net_ratelimit())
626 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
627 "order: %d\n",
628 priv->hw_params.rx_page_order);
629
630 if ((rxq->free_count <= RX_LOW_WATERMARK) &&
631 net_ratelimit())
632 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
633 priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL",
634 rxq->free_count);
635 /* We don't reschedule replenish work here -- we will
636 * call the restock method and if it still needs
637 * more buffers it will schedule replenish */
638 return;
639 }
640
641 spin_lock_irqsave(&rxq->lock, flags);
642
643 if (list_empty(&rxq->rx_used)) {
644 spin_unlock_irqrestore(&rxq->lock, flags);
645 __free_pages(page, priv->hw_params.rx_page_order);
646 return;
647 }
648 element = rxq->rx_used.next;
649 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
650 list_del(element);
651
652 spin_unlock_irqrestore(&rxq->lock, flags);
653
654 BUG_ON(rxb->page);
655 rxb->page = page;
656 /* Get physical address of the RB */
657 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
658 PAGE_SIZE << priv->hw_params.rx_page_order,
659 PCI_DMA_FROMDEVICE);
660 /* dma address must be no more than 36 bits */
661 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
662 /* and also 256 byte aligned! */
663 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
664
665 spin_lock_irqsave(&rxq->lock, flags);
666
667 list_add_tail(&rxb->list, &rxq->rx_free);
668 rxq->free_count++;
669 priv->alloc_rxb_page++;
670
671 spin_unlock_irqrestore(&rxq->lock, flags);
672 }
673}
674
675void iwlagn_rx_replenish(struct iwl_priv *priv)
676{
677 unsigned long flags;
678
679 iwlagn_rx_allocate(priv, GFP_KERNEL);
680
681 spin_lock_irqsave(&priv->lock, flags);
682 iwlagn_rx_queue_restock(priv);
683 spin_unlock_irqrestore(&priv->lock, flags);
684}
685
686void iwlagn_rx_replenish_now(struct iwl_priv *priv)
687{
688 iwlagn_rx_allocate(priv, GFP_ATOMIC);
689
690 iwlagn_rx_queue_restock(priv);
691}
692
693/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
694 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
695 * This free routine walks the list of POOL entries and if SKB is set to
696 * non NULL it is unmapped and freed
697 */
698void iwlagn_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
699{
700 int i;
701 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
702 if (rxq->pool[i].page != NULL) {
703 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
704 PAGE_SIZE << priv->hw_params.rx_page_order,
705 PCI_DMA_FROMDEVICE);
706 __iwl_free_pages(priv, rxq->pool[i].page);
707 rxq->pool[i].page = NULL;
708 }
709 }
710
711 dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
712 rxq->dma_addr);
713 dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
714 rxq->rb_stts, rxq->rb_stts_dma);
715 rxq->bd = NULL;
716 rxq->rb_stts = NULL;
717}
718
719int iwlagn_rxq_stop(struct iwl_priv *priv)
720{
721
722 /* stop Rx DMA */
723 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
724 iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
725 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
726
727 return 0;
728}
729
730int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band)
731{
732 int idx = 0;
733 int band_offset = 0;
734
735 /* HT rate format: mac80211 wants an MCS number, which is just LSB */
736 if (rate_n_flags & RATE_MCS_HT_MSK) {
737 idx = (rate_n_flags & 0xff);
738 return idx;
739 /* Legacy rate format, search for match in table */
740 } else {
741 if (band == IEEE80211_BAND_5GHZ)
742 band_offset = IWL_FIRST_OFDM_RATE;
743 for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++)
744 if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
745 return idx - band_offset;
746 }
747
748 return -1;
749}
750
751/* Calc max signal level (dBm) among 3 possible receivers */
752static inline int iwlagn_calc_rssi(struct iwl_priv *priv,
753 struct iwl_rx_phy_res *rx_resp)
754{
755 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
756}
757
758#ifdef CONFIG_IWLWIFI_DEBUG
759/**
760 * iwlagn_dbg_report_frame - dump frame to syslog during debug sessions
761 *
762 * You may hack this function to show different aspects of received frames,
763 * including selective frame dumps.
764 * group100 parameter selects whether to show 1 out of 100 good data frames.
765 * All beacon and probe response frames are printed.
766 */
767static void iwlagn_dbg_report_frame(struct iwl_priv *priv,
768 struct iwl_rx_phy_res *phy_res, u16 length,
769 struct ieee80211_hdr *header, int group100)
770{
771 u32 to_us;
772 u32 print_summary = 0;
773 u32 print_dump = 0; /* set to 1 to dump all frames' contents */
774 u32 hundred = 0;
775 u32 dataframe = 0;
776 __le16 fc;
777 u16 seq_ctl;
778 u16 channel;
779 u16 phy_flags;
780 u32 rate_n_flags;
781 u32 tsf_low;
782 int rssi;
783
784 if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
785 return;
786
787 /* MAC header */
788 fc = header->frame_control;
789 seq_ctl = le16_to_cpu(header->seq_ctrl);
790
791 /* metadata */
792 channel = le16_to_cpu(phy_res->channel);
793 phy_flags = le16_to_cpu(phy_res->phy_flags);
794 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
795
796 /* signal statistics */
797 rssi = iwlagn_calc_rssi(priv, phy_res);
798 tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
799
800 to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
801
802 /* if data frame is to us and all is good,
803 * (optionally) print summary for only 1 out of every 100 */
804 if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
805 cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
806 dataframe = 1;
807 if (!group100)
808 print_summary = 1; /* print each frame */
809 else if (priv->framecnt_to_us < 100) {
810 priv->framecnt_to_us++;
811 print_summary = 0;
812 } else {
813 priv->framecnt_to_us = 0;
814 print_summary = 1;
815 hundred = 1;
816 }
817 } else {
818 /* print summary for all other frames */
819 print_summary = 1;
820 }
821
822 if (print_summary) {
823 char *title;
824 int rate_idx;
825 u32 bitrate;
826
827 if (hundred)
828 title = "100Frames";
829 else if (ieee80211_has_retry(fc))
830 title = "Retry";
831 else if (ieee80211_is_assoc_resp(fc))
832 title = "AscRsp";
833 else if (ieee80211_is_reassoc_resp(fc))
834 title = "RasRsp";
835 else if (ieee80211_is_probe_resp(fc)) {
836 title = "PrbRsp";
837 print_dump = 1; /* dump frame contents */
838 } else if (ieee80211_is_beacon(fc)) {
839 title = "Beacon";
840 print_dump = 1; /* dump frame contents */
841 } else if (ieee80211_is_atim(fc))
842 title = "ATIM";
843 else if (ieee80211_is_auth(fc))
844 title = "Auth";
845 else if (ieee80211_is_deauth(fc))
846 title = "DeAuth";
847 else if (ieee80211_is_disassoc(fc))
848 title = "DisAssoc";
849 else
850 title = "Frame";
851
852 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
853 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
854 bitrate = 0;
855 WARN_ON_ONCE(1);
856 } else {
857 bitrate = iwl_rates[rate_idx].ieee / 2;
858 }
859
860 /* print frame summary.
861 * MAC addresses show just the last byte (for brevity),
862 * but you can hack it to show more, if you'd like to. */
863 if (dataframe)
864 IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
865 "len=%u, rssi=%d, chnl=%d, rate=%u,\n",
866 title, le16_to_cpu(fc), header->addr1[5],
867 length, rssi, channel, bitrate);
868 else {
869 /* src/dst addresses assume managed mode */
870 IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
871 "len=%u, rssi=%d, tim=%lu usec, "
872 "phy=0x%02x, chnl=%d\n",
873 title, le16_to_cpu(fc), header->addr1[5],
874 header->addr3[5], length, rssi,
875 tsf_low - priv->scan_start_tsf,
876 phy_flags, channel);
877 }
878 }
879 if (print_dump)
880 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
881}
882#endif
883
884static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
885{
886 u32 decrypt_out = 0;
887
888 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
889 RX_RES_STATUS_STATION_FOUND)
890 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
891 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
892
893 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
894
895 /* packet was not encrypted */
896 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
897 RX_RES_STATUS_SEC_TYPE_NONE)
898 return decrypt_out;
899
900 /* packet was encrypted with unknown alg */
901 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
902 RX_RES_STATUS_SEC_TYPE_ERR)
903 return decrypt_out;
904
905 /* decryption was not done in HW */
906 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
907 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
908 return decrypt_out;
909
910 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
911
912 case RX_RES_STATUS_SEC_TYPE_CCMP:
913 /* alg is CCM: check MIC only */
914 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
915 /* Bad MIC */
916 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
917 else
918 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
919
920 break;
921
922 case RX_RES_STATUS_SEC_TYPE_TKIP:
923 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
924 /* Bad TTAK */
925 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
926 break;
927 }
928 /* fall through if TTAK OK */
929 default:
930 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
931 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
932 else
933 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
934 break;
935 }
936
937 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
938 decrypt_in, decrypt_out);
939
940 return decrypt_out;
941}
942
943static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
944 struct ieee80211_hdr *hdr,
945 u16 len,
946 u32 ampdu_status,
947 struct iwl_rx_mem_buffer *rxb,
948 struct ieee80211_rx_status *stats)
949{
950 struct sk_buff *skb;
951 __le16 fc = hdr->frame_control;
952
953 /* We only process data packets if the interface is open */
954 if (unlikely(!priv->is_open)) {
955 IWL_DEBUG_DROP_LIMIT(priv,
956 "Dropping packet while interface is not open.\n");
957 return;
958 }
959
960 /* In case of HW accelerated crypto and bad decryption, drop */
961 if (!priv->cfg->mod_params->sw_crypto &&
962 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
963 return;
964
965 skb = dev_alloc_skb(128);
966 if (!skb) {
967 IWL_ERR(priv, "dev_alloc_skb failed\n");
968 return;
969 }
970
971 skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
972
973 iwl_update_stats(priv, false, fc, len);
974 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
975
976 ieee80211_rx(priv->hw, skb);
977 priv->alloc_rxb_page--;
978 rxb->page = NULL;
979}
980
981/* Called for REPLY_RX (legacy ABG frames), or
982 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
983void iwlagn_rx_reply_rx(struct iwl_priv *priv,
984 struct iwl_rx_mem_buffer *rxb)
985{
986 struct ieee80211_hdr *header;
987 struct ieee80211_rx_status rx_status;
988 struct iwl_rx_packet *pkt = rxb_addr(rxb);
989 struct iwl_rx_phy_res *phy_res;
990 __le32 rx_pkt_status;
991 struct iwl4965_rx_mpdu_res_start *amsdu;
992 u32 len;
993 u32 ampdu_status;
994 u32 rate_n_flags;
995
996 /**
997 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
998 * REPLY_RX: physical layer info is in this buffer
999 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1000 * command and cached in priv->last_phy_res
1001 *
1002 * Here we set up local variables depending on which command is
1003 * received.
1004 */
1005 if (pkt->hdr.cmd == REPLY_RX) {
1006 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
1007 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
1008 + phy_res->cfg_phy_cnt);
1009
1010 len = le16_to_cpu(phy_res->byte_count);
1011 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
1012 phy_res->cfg_phy_cnt + len);
1013 ampdu_status = le32_to_cpu(rx_pkt_status);
1014 } else {
1015 if (!priv->_agn.last_phy_res_valid) {
1016 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1017 return;
1018 }
1019 phy_res = &priv->_agn.last_phy_res;
1020 amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1021 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1022 len = le16_to_cpu(amsdu->byte_count);
1023 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1024 ampdu_status = iwlagn_translate_rx_status(priv,
1025 le32_to_cpu(rx_pkt_status));
1026 }
1027
1028 if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1029 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1030 phy_res->cfg_phy_cnt);
1031 return;
1032 }
1033
1034 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1035 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1036 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1037 le32_to_cpu(rx_pkt_status));
1038 return;
1039 }
1040
1041 /* This will be used in several places later */
1042 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1043
1044 /* rx_status carries information about the packet to mac80211 */
1045 rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1046 rx_status.freq =
1047 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
1048 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1049 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1050 rx_status.rate_idx =
1051 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1052 rx_status.flag = 0;
1053
1054 /* TSF isn't reliable. In order to allow smooth user experience,
1055 * this W/A doesn't propagate it to the mac80211 */
1056 /*rx_status.flag |= RX_FLAG_TSFT;*/
1057
1058 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1059
1060 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1061 rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
1062
1063#ifdef CONFIG_IWLWIFI_DEBUG
1064 /* Set "1" to report good data frames in groups of 100 */
1065 if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
1066 iwlagn_dbg_report_frame(priv, phy_res, len, header, 1);
1067#endif
1068 iwl_dbg_log_rx_data_frame(priv, len, header);
1069 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
1070 rx_status.signal, (unsigned long long)rx_status.mactime);
1071
1072 /*
1073 * "antenna number"
1074 *
1075 * It seems that the antenna field in the phy flags value
1076 * is actually a bit field. This is undefined by radiotap,
1077 * it wants an actual antenna number but I always get "7"
1078 * for most legacy frames I receive indicating that the
1079 * same frame was received on all three RX chains.
1080 *
1081 * I think this field should be removed in favor of a
1082 * new 802.11n radiotap field "RX chains" that is defined
1083 * as a bitmask.
1084 */
1085 rx_status.antenna =
1086 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1087 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1088
1089 /* set the preamble flag if appropriate */
1090 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1091 rx_status.flag |= RX_FLAG_SHORTPRE;
1092
1093 /* Set up the HT phy flags */
1094 if (rate_n_flags & RATE_MCS_HT_MSK)
1095 rx_status.flag |= RX_FLAG_HT;
1096 if (rate_n_flags & RATE_MCS_HT40_MSK)
1097 rx_status.flag |= RX_FLAG_40MHZ;
1098 if (rate_n_flags & RATE_MCS_SGI_MSK)
1099 rx_status.flag |= RX_FLAG_SHORT_GI;
1100
1101 iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1102 rxb, &rx_status);
1103}
1104
1105/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1106 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1107void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
1108 struct iwl_rx_mem_buffer *rxb)
1109{
1110 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1111 priv->_agn.last_phy_res_valid = true;
1112 memcpy(&priv->_agn.last_phy_res, pkt->u.raw,
1113 sizeof(struct iwl_rx_phy_res));
1114}
1115
1116static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
1117 struct ieee80211_vif *vif,
1118 enum ieee80211_band band,
1119 struct iwl_scan_channel *scan_ch)
1120{
1121 const struct ieee80211_supported_band *sband;
1122 const struct iwl_channel_info *ch_info;
1123 u16 passive_dwell = 0;
1124 u16 active_dwell = 0;
1125 int i, added = 0;
1126 u16 channel = 0;
1127
1128 sband = iwl_get_hw_mode(priv, band);
1129 if (!sband) {
1130 IWL_ERR(priv, "invalid band\n");
1131 return added;
1132 }
1133
1134 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
1135 passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1136
1137 if (passive_dwell <= active_dwell)
1138 passive_dwell = active_dwell + 1;
1139
1140 /* only scan single channel, good enough to reset the RF */
1141 /* pick the first valid not in-use channel */
1142 if (band == IEEE80211_BAND_5GHZ) {
1143 for (i = 14; i < priv->channel_count; i++) {
1144 if (priv->channel_info[i].channel !=
1145 le16_to_cpu(priv->staging_rxon.channel)) {
1146 channel = priv->channel_info[i].channel;
1147 ch_info = iwl_get_channel_info(priv,
1148 band, channel);
1149 if (is_channel_valid(ch_info))
1150 break;
1151 }
1152 }
1153 } else {
1154 for (i = 0; i < 14; i++) {
1155 if (priv->channel_info[i].channel !=
1156 le16_to_cpu(priv->staging_rxon.channel)) {
1157 channel =
1158 priv->channel_info[i].channel;
1159 ch_info = iwl_get_channel_info(priv,
1160 band, channel);
1161 if (is_channel_valid(ch_info))
1162 break;
1163 }
1164 }
1165 }
1166 if (channel) {
1167 scan_ch->channel = cpu_to_le16(channel);
1168 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1169 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1170 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1171 /* Set txpower levels to defaults */
1172 scan_ch->dsp_atten = 110;
1173 if (band == IEEE80211_BAND_5GHZ)
1174 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1175 else
1176 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1177 added++;
1178 } else
1179 IWL_ERR(priv, "no valid channel found\n");
1180 return added;
1181}
1182
1183static int iwl_get_channels_for_scan(struct iwl_priv *priv,
1184 struct ieee80211_vif *vif,
1185 enum ieee80211_band band,
1186 u8 is_active, u8 n_probes,
1187 struct iwl_scan_channel *scan_ch)
1188{
1189 struct ieee80211_channel *chan;
1190 const struct ieee80211_supported_band *sband;
1191 const struct iwl_channel_info *ch_info;
1192 u16 passive_dwell = 0;
1193 u16 active_dwell = 0;
1194 int added, i;
1195 u16 channel;
1196
1197 sband = iwl_get_hw_mode(priv, band);
1198 if (!sband)
1199 return 0;
1200
1201 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
1202 passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1203
1204 if (passive_dwell <= active_dwell)
1205 passive_dwell = active_dwell + 1;
1206
1207 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
1208 chan = priv->scan_request->channels[i];
1209
1210 if (chan->band != band)
1211 continue;
1212
1213 channel = ieee80211_frequency_to_channel(chan->center_freq);
1214 scan_ch->channel = cpu_to_le16(channel);
1215
1216 ch_info = iwl_get_channel_info(priv, band, channel);
1217 if (!is_channel_valid(ch_info)) {
1218 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
1219 channel);
1220 continue;
1221 }
1222
1223 if (!is_active || is_channel_passive(ch_info) ||
1224 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
1225 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1226 else
1227 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
1228
1229 if (n_probes)
1230 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
1231
1232 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1233 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1234
1235 /* Set txpower levels to defaults */
1236 scan_ch->dsp_atten = 110;
1237
1238 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
1239 * power level:
1240 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
1241 */
1242 if (band == IEEE80211_BAND_5GHZ)
1243 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1244 else
1245 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1246
1247 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
1248 channel, le32_to_cpu(scan_ch->type),
1249 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1250 "ACTIVE" : "PASSIVE",
1251 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1252 active_dwell : passive_dwell);
1253
1254 scan_ch++;
1255 added++;
1256 }
1257
1258 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
1259 return added;
1260}
1261
1262void iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
1263{
1264 struct iwl_host_cmd cmd = {
1265 .id = REPLY_SCAN_CMD,
1266 .len = sizeof(struct iwl_scan_cmd),
1267 .flags = CMD_SIZE_HUGE,
1268 };
1269 struct iwl_scan_cmd *scan;
1270 struct ieee80211_conf *conf = NULL;
1271 u32 rate_flags = 0;
1272 u16 cmd_len;
1273 u16 rx_chain = 0;
1274 enum ieee80211_band band;
1275 u8 n_probes = 0;
1276 u8 rx_ant = priv->hw_params.valid_rx_ant;
1277 u8 rate;
1278 bool is_active = false;
1279 int chan_mod;
1280 u8 active_chains;
1281
1282 conf = ieee80211_get_hw_conf(priv->hw);
1283
1284 cancel_delayed_work(&priv->scan_check);
1285
1286 if (!iwl_is_ready(priv)) {
1287 IWL_WARN(priv, "request scan called when driver not ready.\n");
1288 goto done;
1289 }
1290
1291 /* Make sure the scan wasn't canceled before this queued work
1292 * was given the chance to run... */
1293 if (!test_bit(STATUS_SCANNING, &priv->status))
1294 goto done;
1295
1296 /* This should never be called or scheduled if there is currently
1297 * a scan active in the hardware. */
1298 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
1299 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
1300 "Ignoring second request.\n");
1301 goto done;
1302 }
1303
1304 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
1305 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
1306 goto done;
1307 }
1308
1309 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
1310 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
1311 goto done;
1312 }
1313
1314 if (iwl_is_rfkill(priv)) {
1315 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
1316 goto done;
1317 }
1318
1319 if (!test_bit(STATUS_READY, &priv->status)) {
1320 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
1321 goto done;
1322 }
1323
1324 if (!priv->scan_cmd) {
1325 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
1326 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
1327 if (!priv->scan_cmd) {
1328 IWL_DEBUG_SCAN(priv,
1329 "fail to allocate memory for scan\n");
1330 goto done;
1331 }
1332 }
1333 scan = priv->scan_cmd;
1334 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
1335
1336 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
1337 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
1338
1339 if (iwl_is_associated(priv)) {
1340 u16 interval = 0;
1341 u32 extra;
1342 u32 suspend_time = 100;
1343 u32 scan_suspend_time = 100;
1344 unsigned long flags;
1345
1346 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
1347 spin_lock_irqsave(&priv->lock, flags);
1348 interval = vif ? vif->bss_conf.beacon_int : 0;
1349 spin_unlock_irqrestore(&priv->lock, flags);
1350
1351 scan->suspend_time = 0;
1352 scan->max_out_time = cpu_to_le32(200 * 1024);
1353 if (!interval)
1354 interval = suspend_time;
1355
1356 extra = (suspend_time / interval) << 22;
1357 scan_suspend_time = (extra |
1358 ((suspend_time % interval) * 1024));
1359 scan->suspend_time = cpu_to_le32(scan_suspend_time);
1360 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
1361 scan_suspend_time, interval);
1362 }
1363
1364 if (priv->is_internal_short_scan) {
1365 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
1366 } else if (priv->scan_request->n_ssids) {
1367 int i, p = 0;
1368 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
1369 for (i = 0; i < priv->scan_request->n_ssids; i++) {
1370 /* always does wildcard anyway */
1371 if (!priv->scan_request->ssids[i].ssid_len)
1372 continue;
1373 scan->direct_scan[p].id = WLAN_EID_SSID;
1374 scan->direct_scan[p].len =
1375 priv->scan_request->ssids[i].ssid_len;
1376 memcpy(scan->direct_scan[p].ssid,
1377 priv->scan_request->ssids[i].ssid,
1378 priv->scan_request->ssids[i].ssid_len);
1379 n_probes++;
1380 p++;
1381 }
1382 is_active = true;
1383 } else
1384 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
1385
1386 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
1387 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
1388 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
1389
1390 switch (priv->scan_band) {
1391 case IEEE80211_BAND_2GHZ:
1392 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
1393 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
1394 >> RXON_FLG_CHANNEL_MODE_POS;
1395 if (chan_mod == CHANNEL_MODE_PURE_40) {
1396 rate = IWL_RATE_6M_PLCP;
1397 } else {
1398 rate = IWL_RATE_1M_PLCP;
1399 rate_flags = RATE_MCS_CCK_MSK;
1400 }
1401 scan->good_CRC_th = IWL_GOOD_CRC_TH_DISABLED;
1402 break;
1403 case IEEE80211_BAND_5GHZ:
1404 rate = IWL_RATE_6M_PLCP;
1405 /*
1406 * If active scanning is requested but a certain channel is
1407 * marked passive, we can do active scanning if we detect
1408 * transmissions.
1409 *
1410 * There is an issue with some firmware versions that triggers
1411 * a sysassert on a "good CRC threshold" of zero (== disabled),
1412 * on a radar channel even though this means that we should NOT
1413 * send probes.
1414 *
1415 * The "good CRC threshold" is the number of frames that we
1416 * need to receive during our dwell time on a channel before
1417 * sending out probes -- setting this to a huge value will
1418 * mean we never reach it, but at the same time work around
1419 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
1420 * here instead of IWL_GOOD_CRC_TH_DISABLED.
1421 */
1422 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
1423 IWL_GOOD_CRC_TH_NEVER;
1424 break;
1425 default:
1426 IWL_WARN(priv, "Invalid scan band count\n");
1427 goto done;
1428 }
1429
1430 band = priv->scan_band;
1431
1432 if (priv->cfg->scan_antennas[band])
1433 rx_ant = priv->cfg->scan_antennas[band];
1434
1435 priv->scan_tx_ant[band] =
1436 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
1437 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
1438 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
1439
1440 /* In power save mode use one chain, otherwise use all chains */
1441 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
1442 /* rx_ant has been set to all valid chains previously */
1443 active_chains = rx_ant &
1444 ((u8)(priv->chain_noise_data.active_chains));
1445 if (!active_chains)
1446 active_chains = rx_ant;
1447
1448 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
1449 priv->chain_noise_data.active_chains);
1450
1451 rx_ant = first_antenna(active_chains);
1452 }
1453 /* MIMO is not used here, but value is required */
1454 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
1455 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
1456 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
1457 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
1458 scan->rx_chain = cpu_to_le16(rx_chain);
1459 if (!priv->is_internal_short_scan) {
1460 cmd_len = iwl_fill_probe_req(priv,
1461 (struct ieee80211_mgmt *)scan->data,
1462 priv->scan_request->ie,
1463 priv->scan_request->ie_len,
1464 IWL_MAX_SCAN_SIZE - sizeof(*scan));
1465 } else {
1466 cmd_len = iwl_fill_probe_req(priv,
1467 (struct ieee80211_mgmt *)scan->data,
1468 NULL, 0,
1469 IWL_MAX_SCAN_SIZE - sizeof(*scan));
1470
1471 }
1472 scan->tx_cmd.len = cpu_to_le16(cmd_len);
1473
1474 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
1475 RXON_FILTER_BCON_AWARE_MSK);
1476
1477 if (priv->is_internal_short_scan) {
1478 scan->channel_count =
1479 iwl_get_single_channel_for_scan(priv, vif, band,
1480 (void *)&scan->data[le16_to_cpu(
1481 scan->tx_cmd.len)]);
1482 } else {
1483 scan->channel_count =
1484 iwl_get_channels_for_scan(priv, vif, band,
1485 is_active, n_probes,
1486 (void *)&scan->data[le16_to_cpu(
1487 scan->tx_cmd.len)]);
1488 }
1489 if (scan->channel_count == 0) {
1490 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
1491 goto done;
1492 }
1493
1494 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
1495 scan->channel_count * sizeof(struct iwl_scan_channel);
1496 cmd.data = scan;
1497 scan->len = cpu_to_le16(cmd.len);
1498
1499 set_bit(STATUS_SCAN_HW, &priv->status);
1500 if (iwl_send_cmd_sync(priv, &cmd))
1501 goto done;
1502
1503 queue_delayed_work(priv->workqueue, &priv->scan_check,
1504 IWL_SCAN_CHECK_WATCHDOG);
1505
1506 return;
1507
1508 done:
1509 /* Cannot perform scan. Make sure we clear scanning
1510 * bits from status so next scan request can be performed.
1511 * If we don't clear scanning status bit here all next scan
1512 * will fail
1513 */
1514 clear_bit(STATUS_SCAN_HW, &priv->status);
1515 clear_bit(STATUS_SCANNING, &priv->status);
1516 /* inform mac80211 scan aborted */
1517 queue_work(priv->workqueue, &priv->scan_completed);
1518}
1519
1520int iwlagn_manage_ibss_station(struct iwl_priv *priv,
1521 struct ieee80211_vif *vif, bool add)
1522{
1523 struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1524
1525 if (add)
1526 return iwl_add_bssid_station(priv, vif->bss_conf.bssid, true,
1527 &vif_priv->ibss_bssid_sta_id);
1528 return iwl_remove_station(priv, vif_priv->ibss_bssid_sta_id,
1529 vif->bss_conf.bssid);
1530}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 13:18:16 -0500