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Merge branch 'for-linville' of git://git.kernel.org/pub/scm/linux/kernel/git/luca...
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-tx.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 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
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-sta.h"
38 #include "iwl-io.h"
39 #include "iwl-helpers.h"
40 #include "iwl-agn-hw.h"
41 #include "iwl-agn.h"
42
43 /*
44 * mac80211 queues, ACs, hardware queues, FIFOs.
45 *
46 * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
47 *
48 * Mac80211 uses the following numbers, which we get as from it
49 * by way of skb_get_queue_mapping(skb):
50 *
51 * VO 0
52 * VI 1
53 * BE 2
54 * BK 3
55 *
56 *
57 * Regular (not A-MPDU) frames are put into hardware queues corresponding
58 * to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
59 * own queue per aggregation session (RA/TID combination), such queues are
60 * set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
61 * order to map frames to the right queue, we also need an AC->hw queue
62 * mapping. This is implemented here.
63 *
64 * Due to the way hw queues are set up (by the hw specific modules like
65 * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
66 * mapping.
67 */
68
69 static const u8 tid_to_ac[] = {
70 IEEE80211_AC_BE,
71 IEEE80211_AC_BK,
72 IEEE80211_AC_BK,
73 IEEE80211_AC_BE,
74 IEEE80211_AC_VI,
75 IEEE80211_AC_VI,
76 IEEE80211_AC_VO,
77 IEEE80211_AC_VO
78 };
79
80 static inline int get_ac_from_tid(u16 tid)
81 {
82 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
83 return tid_to_ac[tid];
84
85 /* no support for TIDs 8-15 yet */
86 return -EINVAL;
87 }
88
89 static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid)
90 {
91 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
92 return ctx->ac_to_fifo[tid_to_ac[tid]];
93
94 /* no support for TIDs 8-15 yet */
95 return -EINVAL;
96 }
97
98 /**
99 * iwlagn_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
100 */
101 static void iwlagn_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
102 struct iwl_tx_queue *txq,
103 u16 byte_cnt)
104 {
105 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
106 int write_ptr = txq->q.write_ptr;
107 int txq_id = txq->q.id;
108 u8 sec_ctl = 0;
109 u8 sta_id = 0;
110 u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
111 __le16 bc_ent;
112
113 WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
114
115 sta_id = txq->cmd[txq->q.write_ptr]->cmd.tx.sta_id;
116 sec_ctl = txq->cmd[txq->q.write_ptr]->cmd.tx.sec_ctl;
117
118 switch (sec_ctl & TX_CMD_SEC_MSK) {
119 case TX_CMD_SEC_CCM:
120 len += CCMP_MIC_LEN;
121 break;
122 case TX_CMD_SEC_TKIP:
123 len += TKIP_ICV_LEN;
124 break;
125 case TX_CMD_SEC_WEP:
126 len += WEP_IV_LEN + WEP_ICV_LEN;
127 break;
128 }
129
130 bc_ent = cpu_to_le16((len & 0xFFF) | (sta_id << 12));
131
132 scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
133
134 if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
135 scd_bc_tbl[txq_id].
136 tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
137 }
138
139 static void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
140 struct iwl_tx_queue *txq)
141 {
142 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
143 int txq_id = txq->q.id;
144 int read_ptr = txq->q.read_ptr;
145 u8 sta_id = 0;
146 __le16 bc_ent;
147
148 WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
149
150 if (txq_id != priv->cmd_queue)
151 sta_id = txq->cmd[read_ptr]->cmd.tx.sta_id;
152
153 bc_ent = cpu_to_le16(1 | (sta_id << 12));
154 scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
155
156 if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
157 scd_bc_tbl[txq_id].
158 tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
159 }
160
161 static int iwlagn_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
162 u16 txq_id)
163 {
164 u32 tbl_dw_addr;
165 u32 tbl_dw;
166 u16 scd_q2ratid;
167
168 scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;
169
170 tbl_dw_addr = priv->scd_base_addr +
171 IWLAGN_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
172
173 tbl_dw = iwl_read_targ_mem(priv, tbl_dw_addr);
174
175 if (txq_id & 0x1)
176 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
177 else
178 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
179
180 iwl_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
181
182 return 0;
183 }
184
185 static void iwlagn_tx_queue_stop_scheduler(struct iwl_priv *priv, u16 txq_id)
186 {
187 /* Simply stop the queue, but don't change any configuration;
188 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
189 iwl_write_prph(priv,
190 IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
191 (0 << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
192 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
193 }
194
195 void iwlagn_set_wr_ptrs(struct iwl_priv *priv,
196 int txq_id, u32 index)
197 {
198 iwl_write_direct32(priv, HBUS_TARG_WRPTR,
199 (index & 0xff) | (txq_id << 8));
200 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_RDPTR(txq_id), index);
201 }
202
203 void iwlagn_tx_queue_set_status(struct iwl_priv *priv,
204 struct iwl_tx_queue *txq,
205 int tx_fifo_id, int scd_retry)
206 {
207 int txq_id = txq->q.id;
208 int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;
209
210 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
211 (active << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
212 (tx_fifo_id << IWLAGN_SCD_QUEUE_STTS_REG_POS_TXF) |
213 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_WSL) |
214 IWLAGN_SCD_QUEUE_STTS_REG_MSK);
215
216 txq->sched_retry = scd_retry;
217
218 IWL_DEBUG_INFO(priv, "%s %s Queue %d on FIFO %d\n",
219 active ? "Activate" : "Deactivate",
220 scd_retry ? "BA" : "AC/CMD", txq_id, tx_fifo_id);
221 }
222
223 static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id, int tid)
224 {
225 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
226 (IWLAGN_FIRST_AMPDU_QUEUE +
227 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
228 IWL_WARN(priv,
229 "queue number out of range: %d, must be %d to %d\n",
230 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
231 IWLAGN_FIRST_AMPDU_QUEUE +
232 priv->cfg->base_params->num_of_ampdu_queues - 1);
233 return -EINVAL;
234 }
235
236 /* Modify device's station table to Tx this TID */
237 return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
238 }
239
240 void iwlagn_txq_agg_queue_setup(struct iwl_priv *priv,
241 struct ieee80211_sta *sta,
242 int tid, int frame_limit)
243 {
244 int sta_id, tx_fifo, txq_id, ssn_idx;
245 u16 ra_tid;
246 unsigned long flags;
247 struct iwl_tid_data *tid_data;
248
249 sta_id = iwl_sta_id(sta);
250 if (WARN_ON(sta_id == IWL_INVALID_STATION))
251 return;
252 if (WARN_ON(tid >= MAX_TID_COUNT))
253 return;
254
255 spin_lock_irqsave(&priv->sta_lock, flags);
256 tid_data = &priv->stations[sta_id].tid[tid];
257 ssn_idx = SEQ_TO_SN(tid_data->seq_number);
258 txq_id = tid_data->agg.txq_id;
259 tx_fifo = tid_data->agg.tx_fifo;
260 spin_unlock_irqrestore(&priv->sta_lock, flags);
261
262 ra_tid = BUILD_RAxTID(sta_id, tid);
263
264 spin_lock_irqsave(&priv->lock, flags);
265
266 /* Stop this Tx queue before configuring it */
267 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
268
269 /* Map receiver-address / traffic-ID to this queue */
270 iwlagn_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
271
272 /* Set this queue as a chain-building queue */
273 iwl_set_bits_prph(priv, IWLAGN_SCD_QUEUECHAIN_SEL, (1<<txq_id));
274
275 /* enable aggregations for the queue */
276 iwl_set_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1<<txq_id));
277
278 /* Place first TFD at index corresponding to start sequence number.
279 * Assumes that ssn_idx is valid (!= 0xFFF) */
280 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
281 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
282 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
283
284 /* Set up Tx window size and frame limit for this queue */
285 iwl_write_targ_mem(priv, priv->scd_base_addr +
286 IWLAGN_SCD_CONTEXT_QUEUE_OFFSET(txq_id) +
287 sizeof(u32),
288 ((frame_limit <<
289 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
290 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
291 ((frame_limit <<
292 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
293 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
294
295 iwl_set_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
296
297 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
298 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
299
300 spin_unlock_irqrestore(&priv->lock, flags);
301 }
302
303 static int iwlagn_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
304 u16 ssn_idx, u8 tx_fifo)
305 {
306 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
307 (IWLAGN_FIRST_AMPDU_QUEUE +
308 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
309 IWL_ERR(priv,
310 "queue number out of range: %d, must be %d to %d\n",
311 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
312 IWLAGN_FIRST_AMPDU_QUEUE +
313 priv->cfg->base_params->num_of_ampdu_queues - 1);
314 return -EINVAL;
315 }
316
317 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
318
319 iwl_clear_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1 << txq_id));
320
321 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
322 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
323 /* supposes that ssn_idx is valid (!= 0xFFF) */
324 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
325
326 iwl_clear_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
327 iwl_txq_ctx_deactivate(priv, txq_id);
328 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
329
330 return 0;
331 }
332
333 /*
334 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
335 * must be called under priv->lock and mac access
336 */
337 void iwlagn_txq_set_sched(struct iwl_priv *priv, u32 mask)
338 {
339 iwl_write_prph(priv, IWLAGN_SCD_TXFACT, mask);
340 }
341
342 /*
343 * handle build REPLY_TX command notification.
344 */
345 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
346 struct sk_buff *skb,
347 struct iwl_tx_cmd *tx_cmd,
348 struct ieee80211_tx_info *info,
349 struct ieee80211_hdr *hdr,
350 u8 std_id)
351 {
352 __le16 fc = hdr->frame_control;
353 __le32 tx_flags = tx_cmd->tx_flags;
354
355 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
356 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
357 tx_flags |= TX_CMD_FLG_ACK_MSK;
358 if (ieee80211_is_mgmt(fc))
359 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
360 if (ieee80211_is_probe_resp(fc) &&
361 !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
362 tx_flags |= TX_CMD_FLG_TSF_MSK;
363 } else {
364 tx_flags &= (~TX_CMD_FLG_ACK_MSK);
365 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
366 }
367
368 if (ieee80211_is_back_req(fc))
369 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
370 else if (info->band == IEEE80211_BAND_2GHZ &&
371 priv->cfg->bt_params &&
372 priv->cfg->bt_params->advanced_bt_coexist &&
373 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
374 ieee80211_is_reassoc_req(fc) ||
375 skb->protocol == cpu_to_be16(ETH_P_PAE)))
376 tx_flags |= TX_CMD_FLG_IGNORE_BT;
377
378
379 tx_cmd->sta_id = std_id;
380 if (ieee80211_has_morefrags(fc))
381 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
382
383 if (ieee80211_is_data_qos(fc)) {
384 u8 *qc = ieee80211_get_qos_ctl(hdr);
385 tx_cmd->tid_tspec = qc[0] & 0xf;
386 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
387 } else {
388 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
389 }
390
391 priv->cfg->ops->utils->tx_cmd_protection(priv, info, fc, &tx_flags);
392
393 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
394 if (ieee80211_is_mgmt(fc)) {
395 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
396 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
397 else
398 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
399 } else {
400 tx_cmd->timeout.pm_frame_timeout = 0;
401 }
402
403 tx_cmd->driver_txop = 0;
404 tx_cmd->tx_flags = tx_flags;
405 tx_cmd->next_frame_len = 0;
406 }
407
408 #define RTS_DFAULT_RETRY_LIMIT 60
409
410 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
411 struct iwl_tx_cmd *tx_cmd,
412 struct ieee80211_tx_info *info,
413 __le16 fc)
414 {
415 u32 rate_flags;
416 int rate_idx;
417 u8 rts_retry_limit;
418 u8 data_retry_limit;
419 u8 rate_plcp;
420
421 /* Set retry limit on DATA packets and Probe Responses*/
422 if (ieee80211_is_probe_resp(fc))
423 data_retry_limit = 3;
424 else
425 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
426 tx_cmd->data_retry_limit = data_retry_limit;
427
428 /* Set retry limit on RTS packets */
429 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
430 if (data_retry_limit < rts_retry_limit)
431 rts_retry_limit = data_retry_limit;
432 tx_cmd->rts_retry_limit = rts_retry_limit;
433
434 /* DATA packets will use the uCode station table for rate/antenna
435 * selection */
436 if (ieee80211_is_data(fc)) {
437 tx_cmd->initial_rate_index = 0;
438 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
439 return;
440 }
441
442 /**
443 * If the current TX rate stored in mac80211 has the MCS bit set, it's
444 * not really a TX rate. Thus, we use the lowest supported rate for
445 * this band. Also use the lowest supported rate if the stored rate
446 * index is invalid.
447 */
448 rate_idx = info->control.rates[0].idx;
449 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
450 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
451 rate_idx = rate_lowest_index(&priv->bands[info->band],
452 info->control.sta);
453 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
454 if (info->band == IEEE80211_BAND_5GHZ)
455 rate_idx += IWL_FIRST_OFDM_RATE;
456 /* Get PLCP rate for tx_cmd->rate_n_flags */
457 rate_plcp = iwl_rates[rate_idx].plcp;
458 /* Zero out flags for this packet */
459 rate_flags = 0;
460
461 /* Set CCK flag as needed */
462 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
463 rate_flags |= RATE_MCS_CCK_MSK;
464
465 /* Set up antennas */
466 if (priv->cfg->bt_params &&
467 priv->cfg->bt_params->advanced_bt_coexist &&
468 priv->bt_full_concurrent) {
469 /* operated as 1x1 in full concurrency mode */
470 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
471 first_antenna(priv->hw_params.valid_tx_ant));
472 } else
473 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
474 priv->hw_params.valid_tx_ant);
475 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
476
477 /* Set the rate in the TX cmd */
478 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
479 }
480
481 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
482 struct ieee80211_tx_info *info,
483 struct iwl_tx_cmd *tx_cmd,
484 struct sk_buff *skb_frag,
485 int sta_id)
486 {
487 struct ieee80211_key_conf *keyconf = info->control.hw_key;
488
489 switch (keyconf->cipher) {
490 case WLAN_CIPHER_SUITE_CCMP:
491 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
492 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
493 if (info->flags & IEEE80211_TX_CTL_AMPDU)
494 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
495 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
496 break;
497
498 case WLAN_CIPHER_SUITE_TKIP:
499 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
500 ieee80211_get_tkip_key(keyconf, skb_frag,
501 IEEE80211_TKIP_P2_KEY, tx_cmd->key);
502 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
503 break;
504
505 case WLAN_CIPHER_SUITE_WEP104:
506 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
507 /* fall through */
508 case WLAN_CIPHER_SUITE_WEP40:
509 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
510 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
511
512 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
513
514 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
515 "with key %d\n", keyconf->keyidx);
516 break;
517
518 default:
519 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
520 break;
521 }
522 }
523
524 /*
525 * start REPLY_TX command process
526 */
527 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
528 {
529 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
531 struct ieee80211_sta *sta = info->control.sta;
532 struct iwl_station_priv *sta_priv = NULL;
533 struct iwl_tx_queue *txq;
534 struct iwl_queue *q;
535 struct iwl_device_cmd *out_cmd;
536 struct iwl_cmd_meta *out_meta;
537 struct iwl_tx_cmd *tx_cmd;
538 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
539 int txq_id;
540 dma_addr_t phys_addr = 0;
541 dma_addr_t txcmd_phys;
542 dma_addr_t scratch_phys;
543 u16 len, firstlen, secondlen;
544 u16 seq_number = 0;
545 __le16 fc;
546 u8 hdr_len;
547 u8 sta_id;
548 u8 wait_write_ptr = 0;
549 u8 tid = 0;
550 u8 *qc = NULL;
551 unsigned long flags;
552 bool is_agg = false;
553
554 /*
555 * If the frame needs to go out off-channel, then
556 * we'll have put the PAN context to that channel,
557 * so make the frame go out there.
558 */
559 if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
560 ctx = &priv->contexts[IWL_RXON_CTX_PAN];
561 else if (info->control.vif)
562 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
563
564 spin_lock_irqsave(&priv->lock, flags);
565 if (iwl_is_rfkill(priv)) {
566 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
567 goto drop_unlock_priv;
568 }
569
570 fc = hdr->frame_control;
571
572 #ifdef CONFIG_IWLWIFI_DEBUG
573 if (ieee80211_is_auth(fc))
574 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
575 else if (ieee80211_is_assoc_req(fc))
576 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
577 else if (ieee80211_is_reassoc_req(fc))
578 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
579 #endif
580
581 hdr_len = ieee80211_hdrlen(fc);
582
583 /* For management frames use broadcast id to do not break aggregation */
584 if (!ieee80211_is_data(fc))
585 sta_id = ctx->bcast_sta_id;
586 else {
587 /* Find index into station table for destination station */
588 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
589 if (sta_id == IWL_INVALID_STATION) {
590 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
591 hdr->addr1);
592 goto drop_unlock_priv;
593 }
594 }
595
596 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
597
598 if (sta)
599 sta_priv = (void *)sta->drv_priv;
600
601 if (sta_priv && sta_priv->asleep &&
602 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
603 /*
604 * This sends an asynchronous command to the device,
605 * but we can rely on it being processed before the
606 * next frame is processed -- and the next frame to
607 * this station is the one that will consume this
608 * counter.
609 * For now set the counter to just 1 since we do not
610 * support uAPSD yet.
611 */
612 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
613 }
614
615 /*
616 * Send this frame after DTIM -- there's a special queue
617 * reserved for this for contexts that support AP mode.
618 */
619 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
620 txq_id = ctx->mcast_queue;
621 /*
622 * The microcode will clear the more data
623 * bit in the last frame it transmits.
624 */
625 hdr->frame_control |=
626 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
627 } else
628 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
629
630 /* irqs already disabled/saved above when locking priv->lock */
631 spin_lock(&priv->sta_lock);
632
633 if (ieee80211_is_data_qos(fc)) {
634 qc = ieee80211_get_qos_ctl(hdr);
635 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
636
637 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
638 goto drop_unlock_sta;
639
640 seq_number = priv->stations[sta_id].tid[tid].seq_number;
641 seq_number &= IEEE80211_SCTL_SEQ;
642 hdr->seq_ctrl = hdr->seq_ctrl &
643 cpu_to_le16(IEEE80211_SCTL_FRAG);
644 hdr->seq_ctrl |= cpu_to_le16(seq_number);
645 seq_number += 0x10;
646 /* aggregation is on for this <sta,tid> */
647 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
648 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
649 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
650 is_agg = true;
651 }
652 }
653
654 txq = &priv->txq[txq_id];
655 q = &txq->q;
656
657 if (unlikely(iwl_queue_space(q) < q->high_mark))
658 goto drop_unlock_sta;
659
660 /* Set up driver data for this TFD */
661 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
662 txq->txb[q->write_ptr].skb = skb;
663 txq->txb[q->write_ptr].ctx = ctx;
664
665 /* Set up first empty entry in queue's array of Tx/cmd buffers */
666 out_cmd = txq->cmd[q->write_ptr];
667 out_meta = &txq->meta[q->write_ptr];
668 tx_cmd = &out_cmd->cmd.tx;
669 memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
670 memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd));
671
672 /*
673 * Set up the Tx-command (not MAC!) header.
674 * Store the chosen Tx queue and TFD index within the sequence field;
675 * after Tx, uCode's Tx response will return this value so driver can
676 * locate the frame within the tx queue and do post-tx processing.
677 */
678 out_cmd->hdr.cmd = REPLY_TX;
679 out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
680 INDEX_TO_SEQ(q->write_ptr)));
681
682 /* Copy MAC header from skb into command buffer */
683 memcpy(tx_cmd->hdr, hdr, hdr_len);
684
685
686 /* Total # bytes to be transmitted */
687 len = (u16)skb->len;
688 tx_cmd->len = cpu_to_le16(len);
689
690 if (info->control.hw_key)
691 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
692
693 /* TODO need this for burst mode later on */
694 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
695 iwl_dbg_log_tx_data_frame(priv, len, hdr);
696
697 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
698
699 iwl_update_stats(priv, true, fc, len);
700 /*
701 * Use the first empty entry in this queue's command buffer array
702 * to contain the Tx command and MAC header concatenated together
703 * (payload data will be in another buffer).
704 * Size of this varies, due to varying MAC header length.
705 * If end is not dword aligned, we'll have 2 extra bytes at the end
706 * of the MAC header (device reads on dword boundaries).
707 * We'll tell device about this padding later.
708 */
709 len = sizeof(struct iwl_tx_cmd) +
710 sizeof(struct iwl_cmd_header) + hdr_len;
711 firstlen = (len + 3) & ~3;
712
713 /* Tell NIC about any 2-byte padding after MAC header */
714 if (firstlen != len)
715 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
716
717 /* Physical address of this Tx command's header (not MAC header!),
718 * within command buffer array. */
719 txcmd_phys = dma_map_single(priv->bus.dev,
720 &out_cmd->hdr, firstlen,
721 DMA_BIDIRECTIONAL);
722 if (unlikely(dma_mapping_error(priv->bus.dev, txcmd_phys)))
723 goto drop_unlock_sta;
724 dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
725 dma_unmap_len_set(out_meta, len, firstlen);
726
727 if (!ieee80211_has_morefrags(hdr->frame_control)) {
728 txq->need_update = 1;
729 } else {
730 wait_write_ptr = 1;
731 txq->need_update = 0;
732 }
733
734 /* Set up TFD's 2nd entry to point directly to remainder of skb,
735 * if any (802.11 null frames have no payload). */
736 secondlen = skb->len - hdr_len;
737 if (secondlen > 0) {
738 phys_addr = dma_map_single(priv->bus.dev, skb->data + hdr_len,
739 secondlen, DMA_TO_DEVICE);
740 if (unlikely(dma_mapping_error(priv->bus.dev, phys_addr))) {
741 dma_unmap_single(priv->bus.dev,
742 dma_unmap_addr(out_meta, mapping),
743 dma_unmap_len(out_meta, len),
744 DMA_BIDIRECTIONAL);
745 goto drop_unlock_sta;
746 }
747 }
748
749 if (ieee80211_is_data_qos(fc)) {
750 priv->stations[sta_id].tid[tid].tfds_in_queue++;
751 if (!ieee80211_has_morefrags(fc))
752 priv->stations[sta_id].tid[tid].seq_number = seq_number;
753 }
754
755 spin_unlock(&priv->sta_lock);
756
757 /* Attach buffers to TFD */
758 iwlagn_txq_attach_buf_to_tfd(priv, txq, txcmd_phys, firstlen, 1);
759 if (secondlen > 0)
760 iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
761 secondlen, 0);
762
763 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
764 offsetof(struct iwl_tx_cmd, scratch);
765
766 /* take back ownership of DMA buffer to enable update */
767 dma_sync_single_for_cpu(priv->bus.dev, txcmd_phys, firstlen,
768 DMA_BIDIRECTIONAL);
769 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
770 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
771
772 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
773 le16_to_cpu(out_cmd->hdr.sequence));
774 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
775 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
776 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
777
778 /* Set up entry for this TFD in Tx byte-count array */
779 if (info->flags & IEEE80211_TX_CTL_AMPDU)
780 iwlagn_txq_update_byte_cnt_tbl(priv, txq,
781 le16_to_cpu(tx_cmd->len));
782
783 dma_sync_single_for_device(priv->bus.dev, txcmd_phys, firstlen,
784 DMA_BIDIRECTIONAL);
785
786 trace_iwlwifi_dev_tx(priv,
787 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
788 sizeof(struct iwl_tfd),
789 &out_cmd->hdr, firstlen,
790 skb->data + hdr_len, secondlen);
791
792 /* Tell device the write index *just past* this latest filled TFD */
793 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
794 iwl_txq_update_write_ptr(priv, txq);
795 spin_unlock_irqrestore(&priv->lock, flags);
796
797 /*
798 * At this point the frame is "transmitted" successfully
799 * and we will get a TX status notification eventually,
800 * regardless of the value of ret. "ret" only indicates
801 * whether or not we should update the write pointer.
802 */
803
804 /*
805 * Avoid atomic ops if it isn't an associated client.
806 * Also, if this is a packet for aggregation, don't
807 * increase the counter because the ucode will stop
808 * aggregation queues when their respective station
809 * goes to sleep.
810 */
811 if (sta_priv && sta_priv->client && !is_agg)
812 atomic_inc(&sta_priv->pending_frames);
813
814 if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) {
815 if (wait_write_ptr) {
816 spin_lock_irqsave(&priv->lock, flags);
817 txq->need_update = 1;
818 iwl_txq_update_write_ptr(priv, txq);
819 spin_unlock_irqrestore(&priv->lock, flags);
820 } else {
821 iwl_stop_queue(priv, txq);
822 }
823 }
824
825 return 0;
826
827 drop_unlock_sta:
828 spin_unlock(&priv->sta_lock);
829 drop_unlock_priv:
830 spin_unlock_irqrestore(&priv->lock, flags);
831 return -1;
832 }
833
834 static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
835 struct iwl_dma_ptr *ptr, size_t size)
836 {
837 ptr->addr = dma_alloc_coherent(priv->bus.dev, size,
838 &ptr->dma, GFP_KERNEL);
839 if (!ptr->addr)
840 return -ENOMEM;
841 ptr->size = size;
842 return 0;
843 }
844
845 static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
846 struct iwl_dma_ptr *ptr)
847 {
848 if (unlikely(!ptr->addr))
849 return;
850
851 dma_free_coherent(priv->bus.dev, ptr->size, ptr->addr, ptr->dma);
852 memset(ptr, 0, sizeof(*ptr));
853 }
854
855 /**
856 * iwlagn_hw_txq_ctx_free - Free TXQ Context
857 *
858 * Destroy all TX DMA queues and structures
859 */
860 void iwlagn_hw_txq_ctx_free(struct iwl_priv *priv)
861 {
862 int txq_id;
863
864 /* Tx queues */
865 if (priv->txq) {
866 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
867 if (txq_id == priv->cmd_queue)
868 iwl_cmd_queue_free(priv);
869 else
870 iwl_tx_queue_free(priv, txq_id);
871 }
872 iwlagn_free_dma_ptr(priv, &priv->kw);
873
874 iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
875
876 /* free tx queue structure */
877 iwl_free_txq_mem(priv);
878 }
879
880 /**
881 * iwlagn_txq_ctx_stop - Stop all Tx DMA channels
882 */
883 void iwlagn_txq_ctx_stop(struct iwl_priv *priv)
884 {
885 int ch, txq_id;
886 unsigned long flags;
887
888 /* Turn off all Tx DMA fifos */
889 spin_lock_irqsave(&priv->lock, flags);
890
891 iwlagn_txq_set_sched(priv, 0);
892
893 /* Stop each Tx DMA channel, and wait for it to be idle */
894 for (ch = 0; ch < priv->hw_params.dma_chnl_num; ch++) {
895 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
896 if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
897 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
898 1000))
899 IWL_ERR(priv, "Failing on timeout while stopping"
900 " DMA channel %d [0x%08x]", ch,
901 iwl_read_direct32(priv, FH_TSSR_TX_STATUS_REG));
902 }
903 spin_unlock_irqrestore(&priv->lock, flags);
904
905 if (!priv->txq)
906 return;
907
908 /* Unmap DMA from host system and free skb's */
909 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
910 if (txq_id == priv->cmd_queue)
911 iwl_cmd_queue_unmap(priv);
912 else
913 iwl_tx_queue_unmap(priv, txq_id);
914 }
915
916 /*
917 * Find first available (lowest unused) Tx Queue, mark it "active".
918 * Called only when finding queue for aggregation.
919 * Should never return anything < 7, because they should already
920 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
921 */
922 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
923 {
924 int txq_id;
925
926 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
927 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
928 return txq_id;
929 return -1;
930 }
931
932 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
933 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
934 {
935 int sta_id;
936 int tx_fifo;
937 int txq_id;
938 int ret;
939 unsigned long flags;
940 struct iwl_tid_data *tid_data;
941
942 tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
943 if (unlikely(tx_fifo < 0))
944 return tx_fifo;
945
946 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
947 sta->addr, tid);
948
949 sta_id = iwl_sta_id(sta);
950 if (sta_id == IWL_INVALID_STATION) {
951 IWL_ERR(priv, "Start AGG on invalid station\n");
952 return -ENXIO;
953 }
954 if (unlikely(tid >= MAX_TID_COUNT))
955 return -EINVAL;
956
957 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
958 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
959 return -ENXIO;
960 }
961
962 txq_id = iwlagn_txq_ctx_activate_free(priv);
963 if (txq_id == -1) {
964 IWL_ERR(priv, "No free aggregation queue available\n");
965 return -ENXIO;
966 }
967
968 spin_lock_irqsave(&priv->sta_lock, flags);
969 tid_data = &priv->stations[sta_id].tid[tid];
970 *ssn = SEQ_TO_SN(tid_data->seq_number);
971 tid_data->agg.txq_id = txq_id;
972 tid_data->agg.tx_fifo = tx_fifo;
973 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
974 spin_unlock_irqrestore(&priv->sta_lock, flags);
975
976 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
977 if (ret)
978 return ret;
979
980 spin_lock_irqsave(&priv->sta_lock, flags);
981 tid_data = &priv->stations[sta_id].tid[tid];
982 if (tid_data->tfds_in_queue == 0) {
983 IWL_DEBUG_HT(priv, "HW queue is empty\n");
984 tid_data->agg.state = IWL_AGG_ON;
985 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
986 } else {
987 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
988 tid_data->tfds_in_queue);
989 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
990 }
991 spin_unlock_irqrestore(&priv->sta_lock, flags);
992 return ret;
993 }
994
995 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
996 struct ieee80211_sta *sta, u16 tid)
997 {
998 int tx_fifo_id, txq_id, sta_id, ssn;
999 struct iwl_tid_data *tid_data;
1000 int write_ptr, read_ptr;
1001 unsigned long flags;
1002
1003 tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
1004 if (unlikely(tx_fifo_id < 0))
1005 return tx_fifo_id;
1006
1007 sta_id = iwl_sta_id(sta);
1008
1009 if (sta_id == IWL_INVALID_STATION) {
1010 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1011 return -ENXIO;
1012 }
1013
1014 spin_lock_irqsave(&priv->sta_lock, flags);
1015
1016 tid_data = &priv->stations[sta_id].tid[tid];
1017 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
1018 txq_id = tid_data->agg.txq_id;
1019
1020 switch (priv->stations[sta_id].tid[tid].agg.state) {
1021 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1022 /*
1023 * This can happen if the peer stops aggregation
1024 * again before we've had a chance to drain the
1025 * queue we selected previously, i.e. before the
1026 * session was really started completely.
1027 */
1028 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
1029 goto turn_off;
1030 case IWL_AGG_ON:
1031 break;
1032 default:
1033 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
1034 }
1035
1036 write_ptr = priv->txq[txq_id].q.write_ptr;
1037 read_ptr = priv->txq[txq_id].q.read_ptr;
1038
1039 /* The queue is not empty */
1040 if (write_ptr != read_ptr) {
1041 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
1042 priv->stations[sta_id].tid[tid].agg.state =
1043 IWL_EMPTYING_HW_QUEUE_DELBA;
1044 spin_unlock_irqrestore(&priv->sta_lock, flags);
1045 return 0;
1046 }
1047
1048 IWL_DEBUG_HT(priv, "HW queue is empty\n");
1049 turn_off:
1050 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
1051
1052 /* do not restore/save irqs */
1053 spin_unlock(&priv->sta_lock);
1054 spin_lock(&priv->lock);
1055
1056 /*
1057 * the only reason this call can fail is queue number out of range,
1058 * which can happen if uCode is reloaded and all the station
1059 * information are lost. if it is outside the range, there is no need
1060 * to deactivate the uCode queue, just return "success" to allow
1061 * mac80211 to clean up it own data.
1062 */
1063 iwlagn_txq_agg_disable(priv, txq_id, ssn, tx_fifo_id);
1064 spin_unlock_irqrestore(&priv->lock, flags);
1065
1066 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1067
1068 return 0;
1069 }
1070
1071 int iwlagn_txq_check_empty(struct iwl_priv *priv,
1072 int sta_id, u8 tid, int txq_id)
1073 {
1074 struct iwl_queue *q = &priv->txq[txq_id].q;
1075 u8 *addr = priv->stations[sta_id].sta.sta.addr;
1076 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
1077 struct iwl_rxon_context *ctx;
1078
1079 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
1080
1081 lockdep_assert_held(&priv->sta_lock);
1082
1083 switch (priv->stations[sta_id].tid[tid].agg.state) {
1084 case IWL_EMPTYING_HW_QUEUE_DELBA:
1085 /* We are reclaiming the last packet of the */
1086 /* aggregated HW queue */
1087 if ((txq_id == tid_data->agg.txq_id) &&
1088 (q->read_ptr == q->write_ptr)) {
1089 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
1090 int tx_fifo = get_fifo_from_tid(ctx, tid);
1091 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
1092 iwlagn_txq_agg_disable(priv, txq_id, ssn, tx_fifo);
1093 tid_data->agg.state = IWL_AGG_OFF;
1094 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1095 }
1096 break;
1097 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1098 /* We are reclaiming the last packet of the queue */
1099 if (tid_data->tfds_in_queue == 0) {
1100 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
1101 tid_data->agg.state = IWL_AGG_ON;
1102 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1103 }
1104 break;
1105 }
1106
1107 return 0;
1108 }
1109
1110 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
1111 struct iwl_rxon_context *ctx,
1112 const u8 *addr1)
1113 {
1114 struct ieee80211_sta *sta;
1115 struct iwl_station_priv *sta_priv;
1116
1117 rcu_read_lock();
1118 sta = ieee80211_find_sta(ctx->vif, addr1);
1119 if (sta) {
1120 sta_priv = (void *)sta->drv_priv;
1121 /* avoid atomic ops if this isn't a client */
1122 if (sta_priv->client &&
1123 atomic_dec_return(&sta_priv->pending_frames) == 0)
1124 ieee80211_sta_block_awake(priv->hw, sta, false);
1125 }
1126 rcu_read_unlock();
1127 }
1128
1129 static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
1130 bool is_agg)
1131 {
1132 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
1133
1134 if (!is_agg)
1135 iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
1136
1137 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
1138 }
1139
1140 int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
1141 {
1142 struct iwl_tx_queue *txq = &priv->txq[txq_id];
1143 struct iwl_queue *q = &txq->q;
1144 struct iwl_tx_info *tx_info;
1145 int nfreed = 0;
1146 struct ieee80211_hdr *hdr;
1147
1148 if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
1149 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
1150 "index %d is out of range [0-%d] %d %d.\n", __func__,
1151 txq_id, index, q->n_bd, q->write_ptr, q->read_ptr);
1152 return 0;
1153 }
1154
1155 for (index = iwl_queue_inc_wrap(index, q->n_bd);
1156 q->read_ptr != index;
1157 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
1158
1159 tx_info = &txq->txb[txq->q.read_ptr];
1160
1161 if (WARN_ON_ONCE(tx_info->skb == NULL))
1162 continue;
1163
1164 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
1165 if (ieee80211_is_data_qos(hdr->frame_control))
1166 nfreed++;
1167
1168 iwlagn_tx_status(priv, tx_info,
1169 txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1170 tx_info->skb = NULL;
1171
1172 iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
1173
1174 iwlagn_txq_free_tfd(priv, txq);
1175 }
1176 return nfreed;
1177 }
1178
1179 /**
1180 * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
1181 *
1182 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
1183 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
1184 */
1185 static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
1186 struct iwl_ht_agg *agg,
1187 struct iwl_compressed_ba_resp *ba_resp)
1188
1189 {
1190 int sh;
1191 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
1192 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1193 struct ieee80211_tx_info *info;
1194 u64 bitmap, sent_bitmap;
1195
1196 if (unlikely(!agg->wait_for_ba)) {
1197 if (unlikely(ba_resp->bitmap))
1198 IWL_ERR(priv, "Received BA when not expected\n");
1199 return -EINVAL;
1200 }
1201
1202 /* Mark that the expected block-ack response arrived */
1203 agg->wait_for_ba = 0;
1204 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
1205
1206 /* Calculate shift to align block-ack bits with our Tx window bits */
1207 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
1208 if (sh < 0)
1209 sh += 0x100;
1210
1211 /*
1212 * Check for success or failure according to the
1213 * transmitted bitmap and block-ack bitmap
1214 */
1215 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
1216 sent_bitmap = bitmap & agg->bitmap;
1217
1218 /* Sanity check values reported by uCode */
1219 if (ba_resp->txed_2_done > ba_resp->txed) {
1220 IWL_DEBUG_TX_REPLY(priv,
1221 "bogus sent(%d) and ack(%d) count\n",
1222 ba_resp->txed, ba_resp->txed_2_done);
1223 /*
1224 * set txed_2_done = txed,
1225 * so it won't impact rate scale
1226 */
1227 ba_resp->txed = ba_resp->txed_2_done;
1228 }
1229 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1230 ba_resp->txed, ba_resp->txed_2_done);
1231
1232 /* Find the first ACKed frame to store the TX status */
1233 while (sent_bitmap && !(sent_bitmap & 1)) {
1234 agg->start_idx = (agg->start_idx + 1) & 0xff;
1235 sent_bitmap >>= 1;
1236 }
1237
1238 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
1239 memset(&info->status, 0, sizeof(info->status));
1240 info->flags |= IEEE80211_TX_STAT_ACK;
1241 info->flags |= IEEE80211_TX_STAT_AMPDU;
1242 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1243 info->status.ampdu_len = ba_resp->txed;
1244 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
1245
1246 return 0;
1247 }
1248
1249 /**
1250 * translate ucode response to mac80211 tx status control values
1251 */
1252 void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
1253 struct ieee80211_tx_info *info)
1254 {
1255 struct ieee80211_tx_rate *r = &info->control.rates[0];
1256
1257 info->antenna_sel_tx =
1258 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1259 if (rate_n_flags & RATE_MCS_HT_MSK)
1260 r->flags |= IEEE80211_TX_RC_MCS;
1261 if (rate_n_flags & RATE_MCS_GF_MSK)
1262 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1263 if (rate_n_flags & RATE_MCS_HT40_MSK)
1264 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1265 if (rate_n_flags & RATE_MCS_DUP_MSK)
1266 r->flags |= IEEE80211_TX_RC_DUP_DATA;
1267 if (rate_n_flags & RATE_MCS_SGI_MSK)
1268 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1269 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
1270 }
1271
1272 /**
1273 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1274 *
1275 * Handles block-acknowledge notification from device, which reports success
1276 * of frames sent via aggregation.
1277 */
1278 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1279 struct iwl_rx_mem_buffer *rxb)
1280 {
1281 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1282 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1283 struct iwl_tx_queue *txq = NULL;
1284 struct iwl_ht_agg *agg;
1285 int index;
1286 int sta_id;
1287 int tid;
1288 unsigned long flags;
1289
1290 /* "flow" corresponds to Tx queue */
1291 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1292
1293 /* "ssn" is start of block-ack Tx window, corresponds to index
1294 * (in Tx queue's circular buffer) of first TFD/frame in window */
1295 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1296
1297 if (scd_flow >= priv->hw_params.max_txq_num) {
1298 IWL_ERR(priv,
1299 "BUG_ON scd_flow is bigger than number of queues\n");
1300 return;
1301 }
1302
1303 txq = &priv->txq[scd_flow];
1304 sta_id = ba_resp->sta_id;
1305 tid = ba_resp->tid;
1306 agg = &priv->stations[sta_id].tid[tid].agg;
1307 if (unlikely(agg->txq_id != scd_flow)) {
1308 /*
1309 * FIXME: this is a uCode bug which need to be addressed,
1310 * log the information and return for now!
1311 * since it is possible happen very often and in order
1312 * not to fill the syslog, don't enable the logging by default
1313 */
1314 IWL_DEBUG_TX_REPLY(priv,
1315 "BA scd_flow %d does not match txq_id %d\n",
1316 scd_flow, agg->txq_id);
1317 return;
1318 }
1319
1320 /* Find index just before block-ack window */
1321 index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
1322
1323 spin_lock_irqsave(&priv->sta_lock, flags);
1324
1325 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1326 "sta_id = %d\n",
1327 agg->wait_for_ba,
1328 (u8 *) &ba_resp->sta_addr_lo32,
1329 ba_resp->sta_id);
1330 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
1331 "%d, scd_ssn = %d\n",
1332 ba_resp->tid,
1333 ba_resp->seq_ctl,
1334 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1335 ba_resp->scd_flow,
1336 ba_resp->scd_ssn);
1337 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
1338 agg->start_idx,
1339 (unsigned long long)agg->bitmap);
1340
1341 /* Update driver's record of ACK vs. not for each frame in window */
1342 iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
1343
1344 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1345 * block-ack window (we assume that they've been successfully
1346 * transmitted ... if not, it's too late anyway). */
1347 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
1348 /* calculate mac80211 ampdu sw queue to wake */
1349 int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
1350 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1351
1352 if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
1353 priv->mac80211_registered &&
1354 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
1355 iwl_wake_queue(priv, txq);
1356
1357 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
1358 }
1359
1360 spin_unlock_irqrestore(&priv->sta_lock, flags);
1361 }
1362
1363 #ifdef CONFIG_IWLWIFI_DEBUG
1364 const char *iwl_get_tx_fail_reason(u32 status)
1365 {
1366 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1367 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1368
1369 switch (status & TX_STATUS_MSK) {
1370 case TX_STATUS_SUCCESS:
1371 return "SUCCESS";
1372 TX_STATUS_POSTPONE(DELAY);
1373 TX_STATUS_POSTPONE(FEW_BYTES);
1374 TX_STATUS_POSTPONE(BT_PRIO);
1375 TX_STATUS_POSTPONE(QUIET_PERIOD);
1376 TX_STATUS_POSTPONE(CALC_TTAK);
1377 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1378 TX_STATUS_FAIL(SHORT_LIMIT);
1379 TX_STATUS_FAIL(LONG_LIMIT);
1380 TX_STATUS_FAIL(FIFO_UNDERRUN);
1381 TX_STATUS_FAIL(DRAIN_FLOW);
1382 TX_STATUS_FAIL(RFKILL_FLUSH);
1383 TX_STATUS_FAIL(LIFE_EXPIRE);
1384 TX_STATUS_FAIL(DEST_PS);
1385 TX_STATUS_FAIL(HOST_ABORTED);
1386 TX_STATUS_FAIL(BT_RETRY);
1387 TX_STATUS_FAIL(STA_INVALID);
1388 TX_STATUS_FAIL(FRAG_DROPPED);
1389 TX_STATUS_FAIL(TID_DISABLE);
1390 TX_STATUS_FAIL(FIFO_FLUSHED);
1391 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
1392 TX_STATUS_FAIL(PASSIVE_NO_RX);
1393 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
1394 }
1395
1396 return "UNKNOWN";
1397
1398 #undef TX_STATUS_FAIL
1399 #undef TX_STATUS_POSTPONE
1400 }
1401 #endif /* CONFIG_IWLWIFI_DEBUG */
Linux kernel - Deliverables
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