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1053d35f RR |
1 | /****************************************************************************** |
2 | * | |
3 | * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved. | |
4 | * | |
5 | * Portions of this file are derived from the ipw3945 project, as well | |
6 | * as portions of the ieee80211 subsystem header files. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of version 2 of the GNU General Public License as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
20 | * | |
21 | * The full GNU General Public License is included in this distribution in the | |
22 | * file called LICENSE. | |
23 | * | |
24 | * Contact Information: | |
25 | * James P. Ketrenos <ipw2100-admin@linux.intel.com> | |
26 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
27 | * | |
28 | *****************************************************************************/ | |
29 | ||
fd4abac5 | 30 | #include <linux/etherdevice.h> |
1053d35f RR |
31 | #include <net/mac80211.h> |
32 | #include "iwl-eeprom.h" | |
33 | #include "iwl-dev.h" | |
34 | #include "iwl-core.h" | |
35 | #include "iwl-sta.h" | |
36 | #include "iwl-io.h" | |
37 | #include "iwl-helpers.h" | |
38 | ||
39 | /** | |
40 | * iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] | |
41 | * | |
42 | * Does NOT advance any TFD circular buffer read/write indexes | |
43 | * Does NOT free the TFD itself (which is within circular buffer) | |
44 | */ | |
16466903 | 45 | int iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq) |
1053d35f RR |
46 | { |
47 | struct iwl_tfd_frame *bd_tmp = (struct iwl_tfd_frame *)&txq->bd[0]; | |
48 | struct iwl_tfd_frame *bd = &bd_tmp[txq->q.read_ptr]; | |
49 | struct pci_dev *dev = priv->pci_dev; | |
50 | int i; | |
51 | int counter = 0; | |
52 | int index, is_odd; | |
53 | ||
54 | /* Host command buffers stay mapped in memory, nothing to clean */ | |
55 | if (txq->q.id == IWL_CMD_QUEUE_NUM) | |
56 | return 0; | |
57 | ||
58 | /* Sanity check on number of chunks */ | |
59 | counter = IWL_GET_BITS(*bd, num_tbs); | |
60 | if (counter > MAX_NUM_OF_TBS) { | |
61 | IWL_ERROR("Too many chunks: %i\n", counter); | |
62 | /* @todo issue fatal error, it is quite serious situation */ | |
63 | return 0; | |
64 | } | |
65 | ||
66 | /* Unmap chunks, if any. | |
67 | * TFD info for odd chunks is different format than for even chunks. */ | |
68 | for (i = 0; i < counter; i++) { | |
69 | index = i / 2; | |
70 | is_odd = i & 0x1; | |
71 | ||
72 | if (is_odd) | |
73 | pci_unmap_single( | |
74 | dev, | |
75 | IWL_GET_BITS(bd->pa[index], tb2_addr_lo16) | | |
76 | (IWL_GET_BITS(bd->pa[index], | |
77 | tb2_addr_hi20) << 16), | |
78 | IWL_GET_BITS(bd->pa[index], tb2_len), | |
79 | PCI_DMA_TODEVICE); | |
80 | ||
81 | else if (i > 0) | |
82 | pci_unmap_single(dev, | |
83 | le32_to_cpu(bd->pa[index].tb1_addr), | |
84 | IWL_GET_BITS(bd->pa[index], tb1_len), | |
85 | PCI_DMA_TODEVICE); | |
86 | ||
87 | /* Free SKB, if any, for this chunk */ | |
88 | if (txq->txb[txq->q.read_ptr].skb[i]) { | |
89 | struct sk_buff *skb = txq->txb[txq->q.read_ptr].skb[i]; | |
90 | ||
91 | dev_kfree_skb(skb); | |
92 | txq->txb[txq->q.read_ptr].skb[i] = NULL; | |
93 | } | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | EXPORT_SYMBOL(iwl_hw_txq_free_tfd); | |
98 | ||
fd4abac5 TW |
99 | |
100 | int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv, void *ptr, | |
101 | dma_addr_t addr, u16 len) | |
102 | { | |
103 | int index, is_odd; | |
104 | struct iwl_tfd_frame *tfd = ptr; | |
105 | u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs); | |
106 | ||
107 | /* Each TFD can point to a maximum 20 Tx buffers */ | |
108 | if ((num_tbs >= MAX_NUM_OF_TBS) || (num_tbs < 0)) { | |
109 | IWL_ERROR("Error can not send more than %d chunks\n", | |
110 | MAX_NUM_OF_TBS); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | index = num_tbs / 2; | |
115 | is_odd = num_tbs & 0x1; | |
116 | ||
117 | if (!is_odd) { | |
118 | tfd->pa[index].tb1_addr = cpu_to_le32(addr); | |
119 | IWL_SET_BITS(tfd->pa[index], tb1_addr_hi, | |
120 | iwl_get_dma_hi_address(addr)); | |
121 | IWL_SET_BITS(tfd->pa[index], tb1_len, len); | |
122 | } else { | |
123 | IWL_SET_BITS(tfd->pa[index], tb2_addr_lo16, | |
124 | (u32) (addr & 0xffff)); | |
125 | IWL_SET_BITS(tfd->pa[index], tb2_addr_hi20, addr >> 16); | |
126 | IWL_SET_BITS(tfd->pa[index], tb2_len, len); | |
127 | } | |
128 | ||
129 | IWL_SET_BITS(*tfd, num_tbs, num_tbs + 1); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | EXPORT_SYMBOL(iwl_hw_txq_attach_buf_to_tfd); | |
134 | ||
135 | /** | |
136 | * iwl_txq_update_write_ptr - Send new write index to hardware | |
137 | */ | |
138 | int iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq) | |
139 | { | |
140 | u32 reg = 0; | |
141 | int ret = 0; | |
142 | int txq_id = txq->q.id; | |
143 | ||
144 | if (txq->need_update == 0) | |
145 | return ret; | |
146 | ||
147 | /* if we're trying to save power */ | |
148 | if (test_bit(STATUS_POWER_PMI, &priv->status)) { | |
149 | /* wake up nic if it's powered down ... | |
150 | * uCode will wake up, and interrupt us again, so next | |
151 | * time we'll skip this part. */ | |
152 | reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); | |
153 | ||
154 | if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { | |
155 | IWL_DEBUG_INFO("Requesting wakeup, GP1 = 0x%x\n", reg); | |
156 | iwl_set_bit(priv, CSR_GP_CNTRL, | |
157 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
158 | return ret; | |
159 | } | |
160 | ||
161 | /* restore this queue's parameters in nic hardware. */ | |
162 | ret = iwl_grab_nic_access(priv); | |
163 | if (ret) | |
164 | return ret; | |
165 | iwl_write_direct32(priv, HBUS_TARG_WRPTR, | |
166 | txq->q.write_ptr | (txq_id << 8)); | |
167 | iwl_release_nic_access(priv); | |
168 | ||
169 | /* else not in power-save mode, uCode will never sleep when we're | |
170 | * trying to tx (during RFKILL, we're not trying to tx). */ | |
171 | } else | |
172 | iwl_write32(priv, HBUS_TARG_WRPTR, | |
173 | txq->q.write_ptr | (txq_id << 8)); | |
174 | ||
175 | txq->need_update = 0; | |
176 | ||
177 | return ret; | |
178 | } | |
179 | EXPORT_SYMBOL(iwl_txq_update_write_ptr); | |
180 | ||
181 | ||
1053d35f RR |
182 | /** |
183 | * iwl_tx_queue_free - Deallocate DMA queue. | |
184 | * @txq: Transmit queue to deallocate. | |
185 | * | |
186 | * Empty queue by removing and destroying all BD's. | |
187 | * Free all buffers. | |
188 | * 0-fill, but do not free "txq" descriptor structure. | |
189 | */ | |
16466903 | 190 | static void iwl_tx_queue_free(struct iwl_priv *priv, struct iwl_tx_queue *txq) |
1053d35f | 191 | { |
443cfd45 | 192 | struct iwl_queue *q = &txq->q; |
1053d35f RR |
193 | struct pci_dev *dev = priv->pci_dev; |
194 | int len; | |
195 | ||
196 | if (q->n_bd == 0) | |
197 | return; | |
198 | ||
199 | /* first, empty all BD's */ | |
200 | for (; q->write_ptr != q->read_ptr; | |
201 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) | |
202 | iwl_hw_txq_free_tfd(priv, txq); | |
203 | ||
204 | len = sizeof(struct iwl_cmd) * q->n_window; | |
205 | if (q->id == IWL_CMD_QUEUE_NUM) | |
206 | len += IWL_MAX_SCAN_SIZE; | |
207 | ||
208 | /* De-alloc array of command/tx buffers */ | |
209 | pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd); | |
210 | ||
211 | /* De-alloc circular buffer of TFDs */ | |
212 | if (txq->q.n_bd) | |
213 | pci_free_consistent(dev, sizeof(struct iwl_tfd_frame) * | |
214 | txq->q.n_bd, txq->bd, txq->q.dma_addr); | |
215 | ||
216 | /* De-alloc array of per-TFD driver data */ | |
217 | kfree(txq->txb); | |
218 | txq->txb = NULL; | |
219 | ||
220 | /* 0-fill queue descriptor structure */ | |
221 | memset(txq, 0, sizeof(*txq)); | |
222 | } | |
223 | ||
fd4abac5 TW |
224 | /*************** DMA-QUEUE-GENERAL-FUNCTIONS ***** |
225 | * DMA services | |
226 | * | |
227 | * Theory of operation | |
228 | * | |
229 | * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer | |
230 | * of buffer descriptors, each of which points to one or more data buffers for | |
231 | * the device to read from or fill. Driver and device exchange status of each | |
232 | * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty | |
233 | * entries in each circular buffer, to protect against confusing empty and full | |
234 | * queue states. | |
235 | * | |
236 | * The device reads or writes the data in the queues via the device's several | |
237 | * DMA/FIFO channels. Each queue is mapped to a single DMA channel. | |
238 | * | |
239 | * For Tx queue, there are low mark and high mark limits. If, after queuing | |
240 | * the packet for Tx, free space become < low mark, Tx queue stopped. When | |
241 | * reclaiming packets (on 'tx done IRQ), if free space become > high mark, | |
242 | * Tx queue resumed. | |
243 | * | |
244 | * See more detailed info in iwl-4965-hw.h. | |
245 | ***************************************************/ | |
246 | ||
247 | int iwl_queue_space(const struct iwl_queue *q) | |
248 | { | |
249 | int s = q->read_ptr - q->write_ptr; | |
250 | ||
251 | if (q->read_ptr > q->write_ptr) | |
252 | s -= q->n_bd; | |
253 | ||
254 | if (s <= 0) | |
255 | s += q->n_window; | |
256 | /* keep some reserve to not confuse empty and full situations */ | |
257 | s -= 2; | |
258 | if (s < 0) | |
259 | s = 0; | |
260 | return s; | |
261 | } | |
262 | EXPORT_SYMBOL(iwl_queue_space); | |
263 | ||
264 | ||
1053d35f RR |
265 | /** |
266 | * iwl_queue_init - Initialize queue's high/low-water and read/write indexes | |
267 | */ | |
443cfd45 | 268 | static int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q, |
1053d35f RR |
269 | int count, int slots_num, u32 id) |
270 | { | |
271 | q->n_bd = count; | |
272 | q->n_window = slots_num; | |
273 | q->id = id; | |
274 | ||
275 | /* count must be power-of-two size, otherwise iwl_queue_inc_wrap | |
276 | * and iwl_queue_dec_wrap are broken. */ | |
277 | BUG_ON(!is_power_of_2(count)); | |
278 | ||
279 | /* slots_num must be power-of-two size, otherwise | |
280 | * get_cmd_index is broken. */ | |
281 | BUG_ON(!is_power_of_2(slots_num)); | |
282 | ||
283 | q->low_mark = q->n_window / 4; | |
284 | if (q->low_mark < 4) | |
285 | q->low_mark = 4; | |
286 | ||
287 | q->high_mark = q->n_window / 8; | |
288 | if (q->high_mark < 2) | |
289 | q->high_mark = 2; | |
290 | ||
291 | q->write_ptr = q->read_ptr = 0; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | /** | |
297 | * iwl_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue | |
298 | */ | |
299 | static int iwl_tx_queue_alloc(struct iwl_priv *priv, | |
16466903 | 300 | struct iwl_tx_queue *txq, u32 id) |
1053d35f RR |
301 | { |
302 | struct pci_dev *dev = priv->pci_dev; | |
303 | ||
304 | /* Driver private data, only for Tx (not command) queues, | |
305 | * not shared with device. */ | |
306 | if (id != IWL_CMD_QUEUE_NUM) { | |
307 | txq->txb = kmalloc(sizeof(txq->txb[0]) * | |
308 | TFD_QUEUE_SIZE_MAX, GFP_KERNEL); | |
309 | if (!txq->txb) { | |
310 | IWL_ERROR("kmalloc for auxiliary BD " | |
311 | "structures failed\n"); | |
312 | goto error; | |
313 | } | |
314 | } else | |
315 | txq->txb = NULL; | |
316 | ||
317 | /* Circular buffer of transmit frame descriptors (TFDs), | |
318 | * shared with device */ | |
319 | txq->bd = pci_alloc_consistent(dev, | |
320 | sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX, | |
321 | &txq->q.dma_addr); | |
322 | ||
323 | if (!txq->bd) { | |
324 | IWL_ERROR("pci_alloc_consistent(%zd) failed\n", | |
325 | sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX); | |
326 | goto error; | |
327 | } | |
328 | txq->q.id = id; | |
329 | ||
330 | return 0; | |
331 | ||
332 | error: | |
333 | kfree(txq->txb); | |
334 | txq->txb = NULL; | |
335 | ||
336 | return -ENOMEM; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Tell nic where to find circular buffer of Tx Frame Descriptors for | |
341 | * given Tx queue, and enable the DMA channel used for that queue. | |
342 | * | |
343 | * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA | |
344 | * channels supported in hardware. | |
345 | */ | |
346 | static int iwl_hw_tx_queue_init(struct iwl_priv *priv, | |
16466903 | 347 | struct iwl_tx_queue *txq) |
1053d35f RR |
348 | { |
349 | int rc; | |
350 | unsigned long flags; | |
351 | int txq_id = txq->q.id; | |
352 | ||
353 | spin_lock_irqsave(&priv->lock, flags); | |
354 | rc = iwl_grab_nic_access(priv); | |
355 | if (rc) { | |
356 | spin_unlock_irqrestore(&priv->lock, flags); | |
357 | return rc; | |
358 | } | |
359 | ||
360 | /* Circular buffer (TFD queue in DRAM) physical base address */ | |
361 | iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id), | |
362 | txq->q.dma_addr >> 8); | |
363 | ||
364 | /* Enable DMA channel, using same id as for TFD queue */ | |
365 | iwl_write_direct32( | |
366 | priv, FH_TCSR_CHNL_TX_CONFIG_REG(txq_id), | |
367 | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE | | |
368 | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL); | |
369 | iwl_release_nic_access(priv); | |
370 | spin_unlock_irqrestore(&priv->lock, flags); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | /** | |
376 | * iwl_tx_queue_init - Allocate and initialize one tx/cmd queue | |
377 | */ | |
378 | static int iwl_tx_queue_init(struct iwl_priv *priv, | |
16466903 | 379 | struct iwl_tx_queue *txq, |
1053d35f RR |
380 | int slots_num, u32 txq_id) |
381 | { | |
382 | struct pci_dev *dev = priv->pci_dev; | |
383 | int len; | |
384 | int rc = 0; | |
385 | ||
386 | /* | |
387 | * Alloc buffer array for commands (Tx or other types of commands). | |
388 | * For the command queue (#4), allocate command space + one big | |
389 | * command for scan, since scan command is very huge; the system will | |
390 | * not have two scans at the same time, so only one is needed. | |
391 | * For normal Tx queues (all other queues), no super-size command | |
392 | * space is needed. | |
393 | */ | |
394 | len = sizeof(struct iwl_cmd) * slots_num; | |
395 | if (txq_id == IWL_CMD_QUEUE_NUM) | |
396 | len += IWL_MAX_SCAN_SIZE; | |
397 | txq->cmd = pci_alloc_consistent(dev, len, &txq->dma_addr_cmd); | |
398 | if (!txq->cmd) | |
399 | return -ENOMEM; | |
400 | ||
401 | /* Alloc driver data array and TFD circular buffer */ | |
402 | rc = iwl_tx_queue_alloc(priv, txq, txq_id); | |
403 | if (rc) { | |
404 | pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd); | |
405 | ||
406 | return -ENOMEM; | |
407 | } | |
408 | txq->need_update = 0; | |
409 | ||
410 | /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise | |
411 | * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */ | |
412 | BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1)); | |
413 | ||
414 | /* Initialize queue's high/low-water marks, and head/tail indexes */ | |
415 | iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id); | |
416 | ||
417 | /* Tell device where to find queue */ | |
418 | iwl_hw_tx_queue_init(priv, txq); | |
419 | ||
420 | return 0; | |
421 | } | |
da1bc453 TW |
422 | /** |
423 | * iwl_hw_txq_ctx_free - Free TXQ Context | |
424 | * | |
425 | * Destroy all TX DMA queues and structures | |
426 | */ | |
427 | void iwl_hw_txq_ctx_free(struct iwl_priv *priv) | |
428 | { | |
429 | int txq_id; | |
430 | ||
431 | /* Tx queues */ | |
432 | for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) | |
433 | iwl_tx_queue_free(priv, &priv->txq[txq_id]); | |
434 | ||
435 | /* Keep-warm buffer */ | |
436 | iwl_kw_free(priv); | |
437 | } | |
438 | EXPORT_SYMBOL(iwl_hw_txq_ctx_free); | |
439 | ||
1053d35f RR |
440 | |
441 | /** | |
442 | * iwl_txq_ctx_reset - Reset TX queue context | |
443 | * Destroys all DMA structures and initialise them again | |
444 | * | |
445 | * @param priv | |
446 | * @return error code | |
447 | */ | |
448 | int iwl_txq_ctx_reset(struct iwl_priv *priv) | |
449 | { | |
450 | int ret = 0; | |
451 | int txq_id, slots_num; | |
da1bc453 | 452 | unsigned long flags; |
1053d35f RR |
453 | |
454 | iwl_kw_free(priv); | |
455 | ||
456 | /* Free all tx/cmd queues and keep-warm buffer */ | |
457 | iwl_hw_txq_ctx_free(priv); | |
458 | ||
459 | /* Alloc keep-warm buffer */ | |
460 | ret = iwl_kw_alloc(priv); | |
461 | if (ret) { | |
462 | IWL_ERROR("Keep Warm allocation failed"); | |
463 | goto error_kw; | |
464 | } | |
da1bc453 TW |
465 | spin_lock_irqsave(&priv->lock, flags); |
466 | ret = iwl_grab_nic_access(priv); | |
467 | if (unlikely(ret)) { | |
468 | spin_unlock_irqrestore(&priv->lock, flags); | |
469 | goto error_reset; | |
470 | } | |
1053d35f RR |
471 | |
472 | /* Turn off all Tx DMA fifos */ | |
da1bc453 TW |
473 | priv->cfg->ops->lib->txq_set_sched(priv, 0); |
474 | ||
475 | iwl_release_nic_access(priv); | |
476 | spin_unlock_irqrestore(&priv->lock, flags); | |
477 | ||
1053d35f RR |
478 | |
479 | /* Tell nic where to find the keep-warm buffer */ | |
480 | ret = iwl_kw_init(priv); | |
481 | if (ret) { | |
482 | IWL_ERROR("kw_init failed\n"); | |
483 | goto error_reset; | |
484 | } | |
485 | ||
da1bc453 | 486 | /* Alloc and init all Tx queues, including the command queue (#4) */ |
1053d35f RR |
487 | for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) { |
488 | slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ? | |
489 | TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; | |
490 | ret = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num, | |
491 | txq_id); | |
492 | if (ret) { | |
493 | IWL_ERROR("Tx %d queue init failed\n", txq_id); | |
494 | goto error; | |
495 | } | |
496 | } | |
497 | ||
498 | return ret; | |
499 | ||
500 | error: | |
501 | iwl_hw_txq_ctx_free(priv); | |
502 | error_reset: | |
503 | iwl_kw_free(priv); | |
504 | error_kw: | |
505 | return ret; | |
506 | } | |
da1bc453 TW |
507 | /** |
508 | * iwl_txq_ctx_stop - Stop all Tx DMA channels, free Tx queue memory | |
509 | */ | |
510 | void iwl_txq_ctx_stop(struct iwl_priv *priv) | |
511 | { | |
512 | ||
513 | int txq_id; | |
514 | unsigned long flags; | |
515 | ||
516 | ||
517 | /* Turn off all Tx DMA fifos */ | |
518 | spin_lock_irqsave(&priv->lock, flags); | |
519 | if (iwl_grab_nic_access(priv)) { | |
520 | spin_unlock_irqrestore(&priv->lock, flags); | |
521 | return; | |
522 | } | |
523 | ||
524 | priv->cfg->ops->lib->txq_set_sched(priv, 0); | |
525 | ||
526 | /* Stop each Tx DMA channel, and wait for it to be idle */ | |
527 | for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) { | |
528 | iwl_write_direct32(priv, | |
529 | FH_TCSR_CHNL_TX_CONFIG_REG(txq_id), 0x0); | |
530 | iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG, | |
531 | FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE | |
532 | (txq_id), 200); | |
533 | } | |
534 | iwl_release_nic_access(priv); | |
535 | spin_unlock_irqrestore(&priv->lock, flags); | |
536 | ||
537 | /* Deallocate memory for all Tx queues */ | |
538 | iwl_hw_txq_ctx_free(priv); | |
539 | } | |
540 | EXPORT_SYMBOL(iwl_txq_ctx_stop); | |
fd4abac5 TW |
541 | |
542 | /* | |
543 | * handle build REPLY_TX command notification. | |
544 | */ | |
545 | static void iwl_tx_cmd_build_basic(struct iwl_priv *priv, | |
546 | struct iwl_tx_cmd *tx_cmd, | |
e039fa4a | 547 | struct ieee80211_tx_info *info, |
fd4abac5 TW |
548 | struct ieee80211_hdr *hdr, |
549 | int is_unicast, u8 std_id) | |
550 | { | |
551 | u16 fc = le16_to_cpu(hdr->frame_control); | |
552 | __le32 tx_flags = tx_cmd->tx_flags; | |
553 | ||
554 | tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
e039fa4a | 555 | if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) { |
fd4abac5 TW |
556 | tx_flags |= TX_CMD_FLG_ACK_MSK; |
557 | if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) | |
558 | tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; | |
559 | if (ieee80211_is_probe_response(fc) && | |
560 | !(le16_to_cpu(hdr->seq_ctrl) & 0xf)) | |
561 | tx_flags |= TX_CMD_FLG_TSF_MSK; | |
562 | } else { | |
563 | tx_flags &= (~TX_CMD_FLG_ACK_MSK); | |
564 | tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; | |
565 | } | |
566 | ||
567 | if (ieee80211_is_back_request(fc)) | |
568 | tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK; | |
569 | ||
570 | ||
571 | tx_cmd->sta_id = std_id; | |
572 | if (ieee80211_get_morefrag(hdr)) | |
573 | tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK; | |
574 | ||
575 | if (ieee80211_is_qos_data(fc)) { | |
576 | u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc)); | |
577 | tx_cmd->tid_tspec = qc[0] & 0xf; | |
578 | tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK; | |
579 | } else { | |
580 | tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; | |
581 | } | |
582 | ||
e039fa4a | 583 | if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) { |
fd4abac5 TW |
584 | tx_flags |= TX_CMD_FLG_RTS_MSK; |
585 | tx_flags &= ~TX_CMD_FLG_CTS_MSK; | |
e039fa4a | 586 | } else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) { |
fd4abac5 TW |
587 | tx_flags &= ~TX_CMD_FLG_RTS_MSK; |
588 | tx_flags |= TX_CMD_FLG_CTS_MSK; | |
589 | } | |
590 | ||
591 | if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK)) | |
592 | tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK; | |
593 | ||
594 | tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK); | |
595 | if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) { | |
596 | if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ || | |
597 | (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_REASSOC_REQ) | |
598 | tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3); | |
599 | else | |
600 | tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2); | |
601 | } else { | |
602 | tx_cmd->timeout.pm_frame_timeout = 0; | |
603 | } | |
604 | ||
605 | tx_cmd->driver_txop = 0; | |
606 | tx_cmd->tx_flags = tx_flags; | |
607 | tx_cmd->next_frame_len = 0; | |
608 | } | |
609 | ||
610 | #define RTS_HCCA_RETRY_LIMIT 3 | |
611 | #define RTS_DFAULT_RETRY_LIMIT 60 | |
612 | ||
613 | static void iwl_tx_cmd_build_rate(struct iwl_priv *priv, | |
614 | struct iwl_tx_cmd *tx_cmd, | |
e039fa4a | 615 | struct ieee80211_tx_info *info, |
fd4abac5 TW |
616 | u16 fc, int sta_id, |
617 | int is_hcca) | |
618 | { | |
619 | u8 rts_retry_limit = 0; | |
620 | u8 data_retry_limit = 0; | |
621 | u8 rate_plcp; | |
622 | u16 rate_flags = 0; | |
2e92e6f2 JB |
623 | int rate_idx; |
624 | ||
e039fa4a | 625 | rate_idx = min(ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xffff, |
2e92e6f2 | 626 | IWL_RATE_COUNT - 1); |
fd4abac5 TW |
627 | |
628 | rate_plcp = iwl_rates[rate_idx].plcp; | |
629 | ||
630 | rts_retry_limit = (is_hcca) ? | |
631 | RTS_HCCA_RETRY_LIMIT : RTS_DFAULT_RETRY_LIMIT; | |
632 | ||
633 | if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE)) | |
634 | rate_flags |= RATE_MCS_CCK_MSK; | |
635 | ||
636 | ||
637 | if (ieee80211_is_probe_response(fc)) { | |
638 | data_retry_limit = 3; | |
639 | if (data_retry_limit < rts_retry_limit) | |
640 | rts_retry_limit = data_retry_limit; | |
641 | } else | |
642 | data_retry_limit = IWL_DEFAULT_TX_RETRY; | |
643 | ||
644 | if (priv->data_retry_limit != -1) | |
645 | data_retry_limit = priv->data_retry_limit; | |
646 | ||
647 | ||
648 | if (ieee80211_is_data(fc)) { | |
649 | tx_cmd->initial_rate_index = 0; | |
650 | tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK; | |
651 | } else { | |
652 | switch (fc & IEEE80211_FCTL_STYPE) { | |
653 | case IEEE80211_STYPE_AUTH: | |
654 | case IEEE80211_STYPE_DEAUTH: | |
655 | case IEEE80211_STYPE_ASSOC_REQ: | |
656 | case IEEE80211_STYPE_REASSOC_REQ: | |
657 | if (tx_cmd->tx_flags & TX_CMD_FLG_RTS_MSK) { | |
658 | tx_cmd->tx_flags &= ~TX_CMD_FLG_RTS_MSK; | |
659 | tx_cmd->tx_flags |= TX_CMD_FLG_CTS_MSK; | |
660 | } | |
661 | break; | |
662 | default: | |
663 | break; | |
664 | } | |
665 | ||
666 | /* Alternate between antenna A and B for successive frames */ | |
667 | if (priv->use_ant_b_for_management_frame) { | |
668 | priv->use_ant_b_for_management_frame = 0; | |
669 | rate_flags |= RATE_MCS_ANT_B_MSK; | |
670 | } else { | |
671 | priv->use_ant_b_for_management_frame = 1; | |
672 | rate_flags |= RATE_MCS_ANT_A_MSK; | |
673 | } | |
674 | } | |
675 | ||
676 | tx_cmd->rts_retry_limit = rts_retry_limit; | |
677 | tx_cmd->data_retry_limit = data_retry_limit; | |
678 | tx_cmd->rate_n_flags = iwl4965_hw_set_rate_n_flags(rate_plcp, rate_flags); | |
679 | } | |
680 | ||
681 | static void iwl_tx_cmd_build_hwcrypto(struct iwl_priv *priv, | |
e039fa4a | 682 | struct ieee80211_tx_info *info, |
fd4abac5 TW |
683 | struct iwl_tx_cmd *tx_cmd, |
684 | struct sk_buff *skb_frag, | |
685 | int sta_id) | |
686 | { | |
e039fa4a | 687 | struct ieee80211_key_conf *keyconf = info->control.hw_key; |
fd4abac5 | 688 | |
ccc038ab | 689 | switch (keyconf->alg) { |
fd4abac5 TW |
690 | case ALG_CCMP: |
691 | tx_cmd->sec_ctl = TX_CMD_SEC_CCM; | |
ccc038ab | 692 | memcpy(tx_cmd->key, keyconf->key, keyconf->keylen); |
e039fa4a | 693 | if (info->flags & IEEE80211_TX_CTL_AMPDU) |
fd4abac5 TW |
694 | tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK; |
695 | IWL_DEBUG_TX("tx_cmd with aes hwcrypto\n"); | |
696 | break; | |
697 | ||
698 | case ALG_TKIP: | |
699 | tx_cmd->sec_ctl = TX_CMD_SEC_TKIP; | |
ccc038ab | 700 | ieee80211_get_tkip_key(keyconf, skb_frag, |
fd4abac5 TW |
701 | IEEE80211_TKIP_P2_KEY, tx_cmd->key); |
702 | IWL_DEBUG_TX("tx_cmd with tkip hwcrypto\n"); | |
703 | break; | |
704 | ||
705 | case ALG_WEP: | |
fd4abac5 | 706 | tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP | |
ccc038ab EG |
707 | (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT); |
708 | ||
709 | if (keyconf->keylen == WEP_KEY_LEN_128) | |
710 | tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128; | |
711 | ||
712 | memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen); | |
fd4abac5 TW |
713 | |
714 | IWL_DEBUG_TX("Configuring packet for WEP encryption " | |
ccc038ab | 715 | "with key %d\n", keyconf->keyidx); |
fd4abac5 TW |
716 | break; |
717 | ||
718 | default: | |
ccc038ab | 719 | printk(KERN_ERR "Unknown encode alg %d\n", keyconf->alg); |
fd4abac5 TW |
720 | break; |
721 | } | |
722 | } | |
723 | ||
724 | static void iwl_update_tx_stats(struct iwl_priv *priv, u16 fc, u16 len) | |
725 | { | |
726 | /* 0 - mgmt, 1 - cnt, 2 - data */ | |
727 | int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2; | |
728 | priv->tx_stats[idx].cnt++; | |
729 | priv->tx_stats[idx].bytes += len; | |
730 | } | |
731 | ||
732 | /* | |
733 | * start REPLY_TX command process | |
734 | */ | |
e039fa4a | 735 | int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb) |
fd4abac5 TW |
736 | { |
737 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
e039fa4a | 738 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
fd4abac5 TW |
739 | struct iwl_tfd_frame *tfd; |
740 | u32 *control_flags; | |
e2530083 | 741 | int txq_id = skb_get_queue_mapping(skb); |
fd4abac5 TW |
742 | struct iwl_tx_queue *txq = NULL; |
743 | struct iwl_queue *q = NULL; | |
744 | dma_addr_t phys_addr; | |
745 | dma_addr_t txcmd_phys; | |
746 | dma_addr_t scratch_phys; | |
747 | struct iwl_cmd *out_cmd = NULL; | |
748 | struct iwl_tx_cmd *tx_cmd; | |
749 | u16 len, idx, len_org; | |
750 | u16 seq_number = 0; | |
751 | u8 id, hdr_len, unicast; | |
752 | u8 sta_id; | |
753 | u16 fc; | |
754 | u8 wait_write_ptr = 0; | |
755 | u8 tid = 0; | |
756 | u8 *qc = NULL; | |
757 | unsigned long flags; | |
758 | int ret; | |
759 | ||
760 | spin_lock_irqsave(&priv->lock, flags); | |
761 | if (iwl_is_rfkill(priv)) { | |
762 | IWL_DEBUG_DROP("Dropping - RF KILL\n"); | |
763 | goto drop_unlock; | |
764 | } | |
765 | ||
766 | if (!priv->vif) { | |
767 | IWL_DEBUG_DROP("Dropping - !priv->vif\n"); | |
768 | goto drop_unlock; | |
769 | } | |
770 | ||
e039fa4a | 771 | if ((ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xFF) == |
2e92e6f2 | 772 | IWL_INVALID_RATE) { |
fd4abac5 TW |
773 | IWL_ERROR("ERROR: No TX rate available.\n"); |
774 | goto drop_unlock; | |
775 | } | |
776 | ||
777 | unicast = !is_multicast_ether_addr(hdr->addr1); | |
778 | id = 0; | |
779 | ||
780 | fc = le16_to_cpu(hdr->frame_control); | |
781 | ||
782 | #ifdef CONFIG_IWLWIFI_DEBUG | |
783 | if (ieee80211_is_auth(fc)) | |
784 | IWL_DEBUG_TX("Sending AUTH frame\n"); | |
785 | else if (ieee80211_is_assoc_request(fc)) | |
786 | IWL_DEBUG_TX("Sending ASSOC frame\n"); | |
787 | else if (ieee80211_is_reassoc_request(fc)) | |
788 | IWL_DEBUG_TX("Sending REASSOC frame\n"); | |
789 | #endif | |
790 | ||
791 | /* drop all data frame if we are not associated */ | |
792 | if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && | |
793 | (!iwl_is_associated(priv) || | |
794 | ((priv->iw_mode == IEEE80211_IF_TYPE_STA) && !priv->assoc_id) || | |
795 | !priv->assoc_station_added)) { | |
796 | IWL_DEBUG_DROP("Dropping - !iwl_is_associated\n"); | |
797 | goto drop_unlock; | |
798 | } | |
799 | ||
800 | spin_unlock_irqrestore(&priv->lock, flags); | |
801 | ||
802 | hdr_len = ieee80211_get_hdrlen(fc); | |
803 | ||
804 | /* Find (or create) index into station table for destination station */ | |
805 | sta_id = iwl_get_sta_id(priv, hdr); | |
806 | if (sta_id == IWL_INVALID_STATION) { | |
807 | DECLARE_MAC_BUF(mac); | |
808 | ||
809 | IWL_DEBUG_DROP("Dropping - INVALID STATION: %s\n", | |
810 | print_mac(mac, hdr->addr1)); | |
811 | goto drop; | |
812 | } | |
813 | ||
814 | IWL_DEBUG_TX("station Id %d\n", sta_id); | |
815 | ||
816 | if (ieee80211_is_qos_data(fc)) { | |
817 | qc = ieee80211_get_qos_ctrl(hdr, hdr_len); | |
818 | tid = qc[0] & 0xf; | |
819 | seq_number = priv->stations[sta_id].tid[tid].seq_number & | |
820 | IEEE80211_SCTL_SEQ; | |
821 | hdr->seq_ctrl = cpu_to_le16(seq_number) | | |
822 | (hdr->seq_ctrl & | |
823 | __constant_cpu_to_le16(IEEE80211_SCTL_FRAG)); | |
824 | seq_number += 0x10; | |
825 | #ifdef CONFIG_IWL4965_HT | |
826 | /* aggregation is on for this <sta,tid> */ | |
e039fa4a | 827 | if (info->flags & IEEE80211_TX_CTL_AMPDU) |
fd4abac5 TW |
828 | txq_id = priv->stations[sta_id].tid[tid].agg.txq_id; |
829 | priv->stations[sta_id].tid[tid].tfds_in_queue++; | |
830 | #endif /* CONFIG_IWL4965_HT */ | |
831 | } | |
832 | ||
833 | /* Descriptor for chosen Tx queue */ | |
834 | txq = &priv->txq[txq_id]; | |
835 | q = &txq->q; | |
836 | ||
837 | spin_lock_irqsave(&priv->lock, flags); | |
838 | ||
839 | /* Set up first empty TFD within this queue's circular TFD buffer */ | |
840 | tfd = &txq->bd[q->write_ptr]; | |
841 | memset(tfd, 0, sizeof(*tfd)); | |
842 | control_flags = (u32 *) tfd; | |
843 | idx = get_cmd_index(q, q->write_ptr, 0); | |
844 | ||
845 | /* Set up driver data for this TFD */ | |
846 | memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info)); | |
847 | txq->txb[q->write_ptr].skb[0] = skb; | |
fd4abac5 TW |
848 | |
849 | /* Set up first empty entry in queue's array of Tx/cmd buffers */ | |
850 | out_cmd = &txq->cmd[idx]; | |
851 | tx_cmd = &out_cmd->cmd.tx; | |
852 | memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr)); | |
853 | memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd)); | |
854 | ||
855 | /* | |
856 | * Set up the Tx-command (not MAC!) header. | |
857 | * Store the chosen Tx queue and TFD index within the sequence field; | |
858 | * after Tx, uCode's Tx response will return this value so driver can | |
859 | * locate the frame within the tx queue and do post-tx processing. | |
860 | */ | |
861 | out_cmd->hdr.cmd = REPLY_TX; | |
862 | out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) | | |
863 | INDEX_TO_SEQ(q->write_ptr))); | |
864 | ||
865 | /* Copy MAC header from skb into command buffer */ | |
866 | memcpy(tx_cmd->hdr, hdr, hdr_len); | |
867 | ||
868 | /* | |
869 | * Use the first empty entry in this queue's command buffer array | |
870 | * to contain the Tx command and MAC header concatenated together | |
871 | * (payload data will be in another buffer). | |
872 | * Size of this varies, due to varying MAC header length. | |
873 | * If end is not dword aligned, we'll have 2 extra bytes at the end | |
874 | * of the MAC header (device reads on dword boundaries). | |
875 | * We'll tell device about this padding later. | |
876 | */ | |
877 | len = sizeof(struct iwl_tx_cmd) + | |
878 | sizeof(struct iwl_cmd_header) + hdr_len; | |
879 | ||
880 | len_org = len; | |
881 | len = (len + 3) & ~3; | |
882 | ||
883 | if (len_org != len) | |
884 | len_org = 1; | |
885 | else | |
886 | len_org = 0; | |
887 | ||
888 | /* Physical address of this Tx command's header (not MAC header!), | |
889 | * within command buffer array. */ | |
890 | txcmd_phys = txq->dma_addr_cmd + sizeof(struct iwl_cmd) * idx + | |
891 | offsetof(struct iwl_cmd, hdr); | |
892 | ||
893 | /* Add buffer containing Tx command and MAC(!) header to TFD's | |
894 | * first entry */ | |
895 | iwl_hw_txq_attach_buf_to_tfd(priv, tfd, txcmd_phys, len); | |
896 | ||
e039fa4a JB |
897 | if (!(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT)) |
898 | iwl_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id); | |
fd4abac5 TW |
899 | |
900 | /* Set up TFD's 2nd entry to point directly to remainder of skb, | |
901 | * if any (802.11 null frames have no payload). */ | |
902 | len = skb->len - hdr_len; | |
903 | if (len) { | |
904 | phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len, | |
905 | len, PCI_DMA_TODEVICE); | |
906 | iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, len); | |
907 | } | |
908 | ||
909 | /* Tell NIC about any 2-byte padding after MAC header */ | |
910 | if (len_org) | |
911 | tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK; | |
912 | ||
913 | /* Total # bytes to be transmitted */ | |
914 | len = (u16)skb->len; | |
915 | tx_cmd->len = cpu_to_le16(len); | |
916 | /* TODO need this for burst mode later on */ | |
e039fa4a | 917 | iwl_tx_cmd_build_basic(priv, tx_cmd, info, hdr, unicast, sta_id); |
fd4abac5 TW |
918 | |
919 | /* set is_hcca to 0; it probably will never be implemented */ | |
e039fa4a | 920 | iwl_tx_cmd_build_rate(priv, tx_cmd, info, fc, sta_id, 0); |
fd4abac5 TW |
921 | |
922 | iwl_update_tx_stats(priv, fc, len); | |
923 | ||
924 | scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) + | |
925 | offsetof(struct iwl_tx_cmd, scratch); | |
926 | tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys); | |
927 | tx_cmd->dram_msb_ptr = iwl_get_dma_hi_address(scratch_phys); | |
928 | ||
929 | if (!ieee80211_get_morefrag(hdr)) { | |
930 | txq->need_update = 1; | |
931 | if (qc) | |
932 | priv->stations[sta_id].tid[tid].seq_number = seq_number; | |
933 | } else { | |
934 | wait_write_ptr = 1; | |
935 | txq->need_update = 0; | |
936 | } | |
937 | ||
938 | iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd)); | |
939 | ||
940 | iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len); | |
941 | ||
942 | /* Set up entry for this TFD in Tx byte-count array */ | |
943 | priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, len); | |
944 | ||
945 | /* Tell device the write index *just past* this latest filled TFD */ | |
946 | q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd); | |
947 | ret = iwl_txq_update_write_ptr(priv, txq); | |
948 | spin_unlock_irqrestore(&priv->lock, flags); | |
949 | ||
950 | if (ret) | |
951 | return ret; | |
952 | ||
953 | if ((iwl_queue_space(q) < q->high_mark) | |
954 | && priv->mac80211_registered) { | |
955 | if (wait_write_ptr) { | |
956 | spin_lock_irqsave(&priv->lock, flags); | |
957 | txq->need_update = 1; | |
958 | iwl_txq_update_write_ptr(priv, txq); | |
959 | spin_unlock_irqrestore(&priv->lock, flags); | |
960 | } | |
961 | ||
e2530083 | 962 | ieee80211_stop_queue(priv->hw, skb_get_queue_mapping(skb)); |
fd4abac5 TW |
963 | } |
964 | ||
965 | return 0; | |
966 | ||
967 | drop_unlock: | |
968 | spin_unlock_irqrestore(&priv->lock, flags); | |
969 | drop: | |
970 | return -1; | |
971 | } | |
972 | EXPORT_SYMBOL(iwl_tx_skb); | |
973 | ||
974 | /*************** HOST COMMAND QUEUE FUNCTIONS *****/ | |
975 | ||
976 | /** | |
977 | * iwl_enqueue_hcmd - enqueue a uCode command | |
978 | * @priv: device private data point | |
979 | * @cmd: a point to the ucode command structure | |
980 | * | |
981 | * The function returns < 0 values to indicate the operation is | |
982 | * failed. On success, it turns the index (> 0) of command in the | |
983 | * command queue. | |
984 | */ | |
985 | int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd) | |
986 | { | |
987 | struct iwl_tx_queue *txq = &priv->txq[IWL_CMD_QUEUE_NUM]; | |
988 | struct iwl_queue *q = &txq->q; | |
989 | struct iwl_tfd_frame *tfd; | |
990 | u32 *control_flags; | |
991 | struct iwl_cmd *out_cmd; | |
992 | u32 idx; | |
993 | u16 fix_size; | |
994 | dma_addr_t phys_addr; | |
995 | int ret; | |
996 | unsigned long flags; | |
997 | ||
998 | cmd->len = priv->cfg->ops->utils->get_hcmd_size(cmd->id, cmd->len); | |
999 | fix_size = (u16)(cmd->len + sizeof(out_cmd->hdr)); | |
1000 | ||
1001 | /* If any of the command structures end up being larger than | |
1002 | * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then | |
1003 | * we will need to increase the size of the TFD entries */ | |
1004 | BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) && | |
1005 | !(cmd->meta.flags & CMD_SIZE_HUGE)); | |
1006 | ||
1007 | if (iwl_is_rfkill(priv)) { | |
1008 | IWL_DEBUG_INFO("Not sending command - RF KILL"); | |
1009 | return -EIO; | |
1010 | } | |
1011 | ||
1012 | if (iwl_queue_space(q) < ((cmd->meta.flags & CMD_ASYNC) ? 2 : 1)) { | |
1013 | IWL_ERROR("No space for Tx\n"); | |
1014 | return -ENOSPC; | |
1015 | } | |
1016 | ||
1017 | spin_lock_irqsave(&priv->hcmd_lock, flags); | |
1018 | ||
1019 | tfd = &txq->bd[q->write_ptr]; | |
1020 | memset(tfd, 0, sizeof(*tfd)); | |
1021 | ||
1022 | control_flags = (u32 *) tfd; | |
1023 | ||
1024 | idx = get_cmd_index(q, q->write_ptr, cmd->meta.flags & CMD_SIZE_HUGE); | |
1025 | out_cmd = &txq->cmd[idx]; | |
1026 | ||
1027 | out_cmd->hdr.cmd = cmd->id; | |
1028 | memcpy(&out_cmd->meta, &cmd->meta, sizeof(cmd->meta)); | |
1029 | memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len); | |
1030 | ||
1031 | /* At this point, the out_cmd now has all of the incoming cmd | |
1032 | * information */ | |
1033 | ||
1034 | out_cmd->hdr.flags = 0; | |
1035 | out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(IWL_CMD_QUEUE_NUM) | | |
1036 | INDEX_TO_SEQ(q->write_ptr)); | |
1037 | if (out_cmd->meta.flags & CMD_SIZE_HUGE) | |
1038 | out_cmd->hdr.sequence |= cpu_to_le16(SEQ_HUGE_FRAME); | |
1039 | ||
1040 | phys_addr = txq->dma_addr_cmd + sizeof(txq->cmd[0]) * idx + | |
1041 | offsetof(struct iwl_cmd, hdr); | |
1042 | iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, fix_size); | |
1043 | ||
1044 | IWL_DEBUG_HC("Sending command %s (#%x), seq: 0x%04X, " | |
1045 | "%d bytes at %d[%d]:%d\n", | |
1046 | get_cmd_string(out_cmd->hdr.cmd), | |
1047 | out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence), | |
1048 | fix_size, q->write_ptr, idx, IWL_CMD_QUEUE_NUM); | |
1049 | ||
1050 | txq->need_update = 1; | |
1051 | ||
1052 | /* Set up entry in queue's byte count circular buffer */ | |
1053 | priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, 0); | |
1054 | ||
1055 | /* Increment and update queue's write index */ | |
1056 | q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd); | |
1057 | ret = iwl_txq_update_write_ptr(priv, txq); | |
1058 | ||
1059 | spin_unlock_irqrestore(&priv->hcmd_lock, flags); | |
1060 | return ret ? ret : idx; | |
1061 | } | |
1062 | ||
17b88929 TW |
1063 | int iwl_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) |
1064 | { | |
1065 | struct iwl_tx_queue *txq = &priv->txq[txq_id]; | |
1066 | struct iwl_queue *q = &txq->q; | |
1067 | struct iwl_tx_info *tx_info; | |
1068 | int nfreed = 0; | |
1069 | ||
1070 | if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) { | |
1071 | IWL_ERROR("Read index for DMA queue txq id (%d), index %d, " | |
1072 | "is out of range [0-%d] %d %d.\n", txq_id, | |
1073 | index, q->n_bd, q->write_ptr, q->read_ptr); | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index; | |
1078 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { | |
1079 | ||
1080 | tx_info = &txq->txb[txq->q.read_ptr]; | |
1081 | ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb[0]); | |
1082 | tx_info->skb[0] = NULL; | |
1083 | iwl_hw_txq_free_tfd(priv, txq); | |
1084 | ||
1085 | nfreed++; | |
1086 | } | |
1087 | return nfreed; | |
1088 | } | |
1089 | EXPORT_SYMBOL(iwl_tx_queue_reclaim); | |
1090 | ||
1091 | ||
1092 | /** | |
1093 | * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd | |
1094 | * | |
1095 | * When FW advances 'R' index, all entries between old and new 'R' index | |
1096 | * need to be reclaimed. As result, some free space forms. If there is | |
1097 | * enough free space (> low mark), wake the stack that feeds us. | |
1098 | */ | |
1099 | static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) | |
1100 | { | |
1101 | struct iwl_tx_queue *txq = &priv->txq[txq_id]; | |
1102 | struct iwl_queue *q = &txq->q; | |
1103 | int nfreed = 0; | |
1104 | ||
1105 | if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) { | |
1106 | IWL_ERROR("Read index for DMA queue txq id (%d), index %d, " | |
1107 | "is out of range [0-%d] %d %d.\n", txq_id, | |
1108 | index, q->n_bd, q->write_ptr, q->read_ptr); | |
1109 | return; | |
1110 | } | |
1111 | ||
1112 | for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index; | |
1113 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { | |
1114 | ||
1115 | if (nfreed > 1) { | |
1116 | IWL_ERROR("HCMD skipped: index (%d) %d %d\n", index, | |
1117 | q->write_ptr, q->read_ptr); | |
1118 | queue_work(priv->workqueue, &priv->restart); | |
1119 | } | |
1120 | nfreed++; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them | |
1126 | * @rxb: Rx buffer to reclaim | |
1127 | * | |
1128 | * If an Rx buffer has an async callback associated with it the callback | |
1129 | * will be executed. The attached skb (if present) will only be freed | |
1130 | * if the callback returns 1 | |
1131 | */ | |
1132 | void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) | |
1133 | { | |
1134 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
1135 | u16 sequence = le16_to_cpu(pkt->hdr.sequence); | |
1136 | int txq_id = SEQ_TO_QUEUE(sequence); | |
1137 | int index = SEQ_TO_INDEX(sequence); | |
1138 | int huge = sequence & SEQ_HUGE_FRAME; | |
1139 | int cmd_index; | |
1140 | struct iwl_cmd *cmd; | |
1141 | ||
1142 | /* If a Tx command is being handled and it isn't in the actual | |
1143 | * command queue then there a command routing bug has been introduced | |
1144 | * in the queue management code. */ | |
1145 | if (txq_id != IWL_CMD_QUEUE_NUM) | |
1146 | IWL_ERROR("Error wrong command queue %d command id 0x%X\n", | |
1147 | txq_id, pkt->hdr.cmd); | |
1148 | BUG_ON(txq_id != IWL_CMD_QUEUE_NUM); | |
1149 | ||
1150 | cmd_index = get_cmd_index(&priv->txq[IWL_CMD_QUEUE_NUM].q, index, huge); | |
1151 | cmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_index]; | |
1152 | ||
1153 | /* Input error checking is done when commands are added to queue. */ | |
1154 | if (cmd->meta.flags & CMD_WANT_SKB) { | |
1155 | cmd->meta.source->u.skb = rxb->skb; | |
1156 | rxb->skb = NULL; | |
1157 | } else if (cmd->meta.u.callback && | |
1158 | !cmd->meta.u.callback(priv, cmd, rxb->skb)) | |
1159 | rxb->skb = NULL; | |
1160 | ||
1161 | iwl_hcmd_queue_reclaim(priv, txq_id, index); | |
1162 | ||
1163 | if (!(cmd->meta.flags & CMD_ASYNC)) { | |
1164 | clear_bit(STATUS_HCMD_ACTIVE, &priv->status); | |
1165 | wake_up_interruptible(&priv->wait_command_queue); | |
1166 | } | |
1167 | } | |
1168 | EXPORT_SYMBOL(iwl_tx_cmd_complete); | |
1169 | ||
1170 | ||
a332f8d6 TW |
1171 | #ifdef CONFIG_IWLWIF_DEBUG |
1172 | #define TX_STATUS_ENTRY(x) case TX_STATUS_FAIL_ ## x: return #x | |
1173 | ||
1174 | const char *iwl_get_tx_fail_reason(u32 status) | |
1175 | { | |
1176 | switch (status & TX_STATUS_MSK) { | |
1177 | case TX_STATUS_SUCCESS: | |
1178 | return "SUCCESS"; | |
1179 | TX_STATUS_ENTRY(SHORT_LIMIT); | |
1180 | TX_STATUS_ENTRY(LONG_LIMIT); | |
1181 | TX_STATUS_ENTRY(FIFO_UNDERRUN); | |
1182 | TX_STATUS_ENTRY(MGMNT_ABORT); | |
1183 | TX_STATUS_ENTRY(NEXT_FRAG); | |
1184 | TX_STATUS_ENTRY(LIFE_EXPIRE); | |
1185 | TX_STATUS_ENTRY(DEST_PS); | |
1186 | TX_STATUS_ENTRY(ABORTED); | |
1187 | TX_STATUS_ENTRY(BT_RETRY); | |
1188 | TX_STATUS_ENTRY(STA_INVALID); | |
1189 | TX_STATUS_ENTRY(FRAG_DROPPED); | |
1190 | TX_STATUS_ENTRY(TID_DISABLE); | |
1191 | TX_STATUS_ENTRY(FRAME_FLUSHED); | |
1192 | TX_STATUS_ENTRY(INSUFFICIENT_CF_POLL); | |
1193 | TX_STATUS_ENTRY(TX_LOCKED); | |
1194 | TX_STATUS_ENTRY(NO_BEACON_ON_RADAR); | |
1195 | } | |
1196 | ||
1197 | return "UNKNOWN"; | |
1198 | } | |
1199 | EXPORT_SYMBOL(iwl_get_tx_fail_reason); | |
1200 | #endif /* CONFIG_IWLWIFI_DEBUG */ |