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iwlagn: move Tx datapath to transport layer
[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 #include "iwl-trans.h"
43
44 /*
45 * mac80211 queues, ACs, hardware queues, FIFOs.
46 *
47 * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
48 *
49 * Mac80211 uses the following numbers, which we get as from it
50 * by way of skb_get_queue_mapping(skb):
51 *
52 * VO 0
53 * VI 1
54 * BE 2
55 * BK 3
56 *
57 *
58 * Regular (not A-MPDU) frames are put into hardware queues corresponding
59 * to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
60 * own queue per aggregation session (RA/TID combination), such queues are
61 * set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
62 * order to map frames to the right queue, we also need an AC->hw queue
63 * mapping. This is implemented here.
64 *
65 * Due to the way hw queues are set up (by the hw specific modules like
66 * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
67 * mapping.
68 */
69
70 static const u8 tid_to_ac[] = {
71 IEEE80211_AC_BE,
72 IEEE80211_AC_BK,
73 IEEE80211_AC_BK,
74 IEEE80211_AC_BE,
75 IEEE80211_AC_VI,
76 IEEE80211_AC_VI,
77 IEEE80211_AC_VO,
78 IEEE80211_AC_VO
79 };
80
81 static inline int get_ac_from_tid(u16 tid)
82 {
83 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
84 return tid_to_ac[tid];
85
86 /* no support for TIDs 8-15 yet */
87 return -EINVAL;
88 }
89
90 static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid)
91 {
92 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
93 return ctx->ac_to_fifo[tid_to_ac[tid]];
94
95 /* no support for TIDs 8-15 yet */
96 return -EINVAL;
97 }
98
99 /**
100 * iwlagn_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
101 */
102 void iwlagn_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
103 struct iwl_tx_queue *txq,
104 u16 byte_cnt)
105 {
106 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
107 int write_ptr = txq->q.write_ptr;
108 int txq_id = txq->q.id;
109 u8 sec_ctl = 0;
110 u8 sta_id = 0;
111 u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
112 __le16 bc_ent;
113
114 WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
115
116 sta_id = txq->cmd[txq->q.write_ptr]->cmd.tx.sta_id;
117 sec_ctl = txq->cmd[txq->q.write_ptr]->cmd.tx.sec_ctl;
118
119 switch (sec_ctl & TX_CMD_SEC_MSK) {
120 case TX_CMD_SEC_CCM:
121 len += CCMP_MIC_LEN;
122 break;
123 case TX_CMD_SEC_TKIP:
124 len += TKIP_ICV_LEN;
125 break;
126 case TX_CMD_SEC_WEP:
127 len += WEP_IV_LEN + WEP_ICV_LEN;
128 break;
129 }
130
131 bc_ent = cpu_to_le16((len & 0xFFF) | (sta_id << 12));
132
133 scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
134
135 if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
136 scd_bc_tbl[txq_id].
137 tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
138 }
139
140 static void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
141 struct iwl_tx_queue *txq)
142 {
143 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
144 int txq_id = txq->q.id;
145 int read_ptr = txq->q.read_ptr;
146 u8 sta_id = 0;
147 __le16 bc_ent;
148
149 WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
150
151 if (txq_id != priv->cmd_queue)
152 sta_id = txq->cmd[read_ptr]->cmd.tx.sta_id;
153
154 bc_ent = cpu_to_le16(1 | (sta_id << 12));
155 scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
156
157 if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
158 scd_bc_tbl[txq_id].
159 tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
160 }
161
162 static int iwlagn_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
163 u16 txq_id)
164 {
165 u32 tbl_dw_addr;
166 u32 tbl_dw;
167 u16 scd_q2ratid;
168
169 scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;
170
171 tbl_dw_addr = priv->scd_base_addr +
172 IWLAGN_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
173
174 tbl_dw = iwl_read_targ_mem(priv, tbl_dw_addr);
175
176 if (txq_id & 0x1)
177 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
178 else
179 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
180
181 iwl_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
182
183 return 0;
184 }
185
186 static void iwlagn_tx_queue_stop_scheduler(struct iwl_priv *priv, u16 txq_id)
187 {
188 /* Simply stop the queue, but don't change any configuration;
189 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
190 iwl_write_prph(priv,
191 IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
192 (0 << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
193 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
194 }
195
196 void iwlagn_set_wr_ptrs(struct iwl_priv *priv,
197 int txq_id, u32 index)
198 {
199 iwl_write_direct32(priv, HBUS_TARG_WRPTR,
200 (index & 0xff) | (txq_id << 8));
201 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_RDPTR(txq_id), index);
202 }
203
204 void iwlagn_tx_queue_set_status(struct iwl_priv *priv,
205 struct iwl_tx_queue *txq,
206 int tx_fifo_id, int scd_retry)
207 {
208 int txq_id = txq->q.id;
209 int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;
210
211 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
212 (active << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
213 (tx_fifo_id << IWLAGN_SCD_QUEUE_STTS_REG_POS_TXF) |
214 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_WSL) |
215 IWLAGN_SCD_QUEUE_STTS_REG_MSK);
216
217 txq->sched_retry = scd_retry;
218
219 IWL_DEBUG_INFO(priv, "%s %s Queue %d on FIFO %d\n",
220 active ? "Activate" : "Deactivate",
221 scd_retry ? "BA" : "AC/CMD", txq_id, tx_fifo_id);
222 }
223
224 static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id, int tid)
225 {
226 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
227 (IWLAGN_FIRST_AMPDU_QUEUE +
228 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
229 IWL_WARN(priv,
230 "queue number out of range: %d, must be %d to %d\n",
231 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
232 IWLAGN_FIRST_AMPDU_QUEUE +
233 priv->cfg->base_params->num_of_ampdu_queues - 1);
234 return -EINVAL;
235 }
236
237 /* Modify device's station table to Tx this TID */
238 return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
239 }
240
241 void iwlagn_txq_agg_queue_setup(struct iwl_priv *priv,
242 struct ieee80211_sta *sta,
243 int tid, int frame_limit)
244 {
245 int sta_id, tx_fifo, txq_id, ssn_idx;
246 u16 ra_tid;
247 unsigned long flags;
248 struct iwl_tid_data *tid_data;
249
250 sta_id = iwl_sta_id(sta);
251 if (WARN_ON(sta_id == IWL_INVALID_STATION))
252 return;
253 if (WARN_ON(tid >= MAX_TID_COUNT))
254 return;
255
256 spin_lock_irqsave(&priv->sta_lock, flags);
257 tid_data = &priv->stations[sta_id].tid[tid];
258 ssn_idx = SEQ_TO_SN(tid_data->seq_number);
259 txq_id = tid_data->agg.txq_id;
260 tx_fifo = tid_data->agg.tx_fifo;
261 spin_unlock_irqrestore(&priv->sta_lock, flags);
262
263 ra_tid = BUILD_RAxTID(sta_id, tid);
264
265 spin_lock_irqsave(&priv->lock, flags);
266
267 /* Stop this Tx queue before configuring it */
268 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
269
270 /* Map receiver-address / traffic-ID to this queue */
271 iwlagn_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
272
273 /* Set this queue as a chain-building queue */
274 iwl_set_bits_prph(priv, IWLAGN_SCD_QUEUECHAIN_SEL, (1<<txq_id));
275
276 /* enable aggregations for the queue */
277 iwl_set_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1<<txq_id));
278
279 /* Place first TFD at index corresponding to start sequence number.
280 * Assumes that ssn_idx is valid (!= 0xFFF) */
281 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
282 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
283 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
284
285 /* Set up Tx window size and frame limit for this queue */
286 iwl_write_targ_mem(priv, priv->scd_base_addr +
287 IWLAGN_SCD_CONTEXT_QUEUE_OFFSET(txq_id) +
288 sizeof(u32),
289 ((frame_limit <<
290 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
291 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
292 ((frame_limit <<
293 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
294 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
295
296 iwl_set_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
297
298 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
299 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
300
301 spin_unlock_irqrestore(&priv->lock, flags);
302 }
303
304 static int iwlagn_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
305 u16 ssn_idx, u8 tx_fifo)
306 {
307 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
308 (IWLAGN_FIRST_AMPDU_QUEUE +
309 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
310 IWL_ERR(priv,
311 "queue number out of range: %d, must be %d to %d\n",
312 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
313 IWLAGN_FIRST_AMPDU_QUEUE +
314 priv->cfg->base_params->num_of_ampdu_queues - 1);
315 return -EINVAL;
316 }
317
318 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
319
320 iwl_clear_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1 << txq_id));
321
322 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
323 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
324 /* supposes that ssn_idx is valid (!= 0xFFF) */
325 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
326
327 iwl_clear_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
328 iwl_txq_ctx_deactivate(priv, txq_id);
329 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
330
331 return 0;
332 }
333
334 /*
335 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
336 * must be called under priv->lock and mac access
337 */
338 void iwlagn_txq_set_sched(struct iwl_priv *priv, u32 mask)
339 {
340 iwl_write_prph(priv, IWLAGN_SCD_TXFACT, mask);
341 }
342
343 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
344 struct ieee80211_tx_info *info,
345 __le16 fc, __le32 *tx_flags)
346 {
347 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
348 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
349 info->flags & IEEE80211_TX_CTL_AMPDU)
350 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
351 }
352
353 /*
354 * handle build REPLY_TX command notification.
355 */
356 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
357 struct sk_buff *skb,
358 struct iwl_tx_cmd *tx_cmd,
359 struct ieee80211_tx_info *info,
360 struct ieee80211_hdr *hdr,
361 u8 std_id)
362 {
363 __le16 fc = hdr->frame_control;
364 __le32 tx_flags = tx_cmd->tx_flags;
365
366 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
367 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
368 tx_flags |= TX_CMD_FLG_ACK_MSK;
369 if (ieee80211_is_mgmt(fc))
370 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
371 if (ieee80211_is_probe_resp(fc) &&
372 !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
373 tx_flags |= TX_CMD_FLG_TSF_MSK;
374 } else {
375 tx_flags &= (~TX_CMD_FLG_ACK_MSK);
376 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
377 }
378
379 if (ieee80211_is_back_req(fc))
380 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
381 else if (info->band == IEEE80211_BAND_2GHZ &&
382 priv->cfg->bt_params &&
383 priv->cfg->bt_params->advanced_bt_coexist &&
384 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
385 ieee80211_is_reassoc_req(fc) ||
386 skb->protocol == cpu_to_be16(ETH_P_PAE)))
387 tx_flags |= TX_CMD_FLG_IGNORE_BT;
388
389
390 tx_cmd->sta_id = std_id;
391 if (ieee80211_has_morefrags(fc))
392 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
393
394 if (ieee80211_is_data_qos(fc)) {
395 u8 *qc = ieee80211_get_qos_ctl(hdr);
396 tx_cmd->tid_tspec = qc[0] & 0xf;
397 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
398 } else {
399 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
400 }
401
402 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
403
404 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
405 if (ieee80211_is_mgmt(fc)) {
406 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
407 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
408 else
409 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
410 } else {
411 tx_cmd->timeout.pm_frame_timeout = 0;
412 }
413
414 tx_cmd->driver_txop = 0;
415 tx_cmd->tx_flags = tx_flags;
416 tx_cmd->next_frame_len = 0;
417 }
418
419 #define RTS_DFAULT_RETRY_LIMIT 60
420
421 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
422 struct iwl_tx_cmd *tx_cmd,
423 struct ieee80211_tx_info *info,
424 __le16 fc)
425 {
426 u32 rate_flags;
427 int rate_idx;
428 u8 rts_retry_limit;
429 u8 data_retry_limit;
430 u8 rate_plcp;
431
432 /* Set retry limit on DATA packets and Probe Responses*/
433 if (ieee80211_is_probe_resp(fc))
434 data_retry_limit = 3;
435 else
436 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
437 tx_cmd->data_retry_limit = data_retry_limit;
438
439 /* Set retry limit on RTS packets */
440 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
441 if (data_retry_limit < rts_retry_limit)
442 rts_retry_limit = data_retry_limit;
443 tx_cmd->rts_retry_limit = rts_retry_limit;
444
445 /* DATA packets will use the uCode station table for rate/antenna
446 * selection */
447 if (ieee80211_is_data(fc)) {
448 tx_cmd->initial_rate_index = 0;
449 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
450 if (priv->tm_fixed_rate) {
451 /*
452 * rate overwrite by testmode
453 * we not only send lq command to change rate
454 * we also re-enforce per data pkt base.
455 */
456 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
457 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
458 sizeof(tx_cmd->rate_n_flags));
459 }
460 return;
461 }
462
463 /**
464 * If the current TX rate stored in mac80211 has the MCS bit set, it's
465 * not really a TX rate. Thus, we use the lowest supported rate for
466 * this band. Also use the lowest supported rate if the stored rate
467 * index is invalid.
468 */
469 rate_idx = info->control.rates[0].idx;
470 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
471 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
472 rate_idx = rate_lowest_index(&priv->bands[info->band],
473 info->control.sta);
474 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
475 if (info->band == IEEE80211_BAND_5GHZ)
476 rate_idx += IWL_FIRST_OFDM_RATE;
477 /* Get PLCP rate for tx_cmd->rate_n_flags */
478 rate_plcp = iwl_rates[rate_idx].plcp;
479 /* Zero out flags for this packet */
480 rate_flags = 0;
481
482 /* Set CCK flag as needed */
483 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
484 rate_flags |= RATE_MCS_CCK_MSK;
485
486 /* Set up antennas */
487 if (priv->cfg->bt_params &&
488 priv->cfg->bt_params->advanced_bt_coexist &&
489 priv->bt_full_concurrent) {
490 /* operated as 1x1 in full concurrency mode */
491 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
492 first_antenna(priv->hw_params.valid_tx_ant));
493 } else
494 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
495 priv->hw_params.valid_tx_ant);
496 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
497
498 /* Set the rate in the TX cmd */
499 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
500 }
501
502 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
503 struct ieee80211_tx_info *info,
504 struct iwl_tx_cmd *tx_cmd,
505 struct sk_buff *skb_frag,
506 int sta_id)
507 {
508 struct ieee80211_key_conf *keyconf = info->control.hw_key;
509
510 switch (keyconf->cipher) {
511 case WLAN_CIPHER_SUITE_CCMP:
512 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
513 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
514 if (info->flags & IEEE80211_TX_CTL_AMPDU)
515 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
516 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
517 break;
518
519 case WLAN_CIPHER_SUITE_TKIP:
520 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
521 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
522 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
523 break;
524
525 case WLAN_CIPHER_SUITE_WEP104:
526 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
527 /* fall through */
528 case WLAN_CIPHER_SUITE_WEP40:
529 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
530 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
531
532 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
533
534 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
535 "with key %d\n", keyconf->keyidx);
536 break;
537
538 default:
539 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
540 break;
541 }
542 }
543
544 /*
545 * start REPLY_TX command process
546 */
547 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
548 {
549 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
550 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
551 struct iwl_station_priv *sta_priv = NULL;
552 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
553 struct iwl_tx_cmd *tx_cmd;
554 int txq_id;
555
556 u16 seq_number = 0;
557 __le16 fc;
558 u8 hdr_len;
559 u16 len;
560 u8 sta_id;
561 u8 tid = 0;
562 unsigned long flags;
563 bool is_agg = false;
564
565 /*
566 * If the frame needs to go out off-channel, then
567 * we'll have put the PAN context to that channel,
568 * so make the frame go out there.
569 */
570 if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
571 ctx = &priv->contexts[IWL_RXON_CTX_PAN];
572 else if (info->control.vif)
573 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
574
575 spin_lock_irqsave(&priv->lock, flags);
576 if (iwl_is_rfkill(priv)) {
577 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
578 goto drop_unlock_priv;
579 }
580
581 fc = hdr->frame_control;
582
583 #ifdef CONFIG_IWLWIFI_DEBUG
584 if (ieee80211_is_auth(fc))
585 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
586 else if (ieee80211_is_assoc_req(fc))
587 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
588 else if (ieee80211_is_reassoc_req(fc))
589 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
590 #endif
591
592 hdr_len = ieee80211_hdrlen(fc);
593
594 /* For management frames use broadcast id to do not break aggregation */
595 if (!ieee80211_is_data(fc))
596 sta_id = ctx->bcast_sta_id;
597 else {
598 /* Find index into station table for destination station */
599 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
600 if (sta_id == IWL_INVALID_STATION) {
601 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
602 hdr->addr1);
603 goto drop_unlock_priv;
604 }
605 }
606
607 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
608
609 if (info->control.sta)
610 sta_priv = (void *)info->control.sta->drv_priv;
611
612 if (sta_priv && sta_priv->asleep &&
613 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
614 /*
615 * This sends an asynchronous command to the device,
616 * but we can rely on it being processed before the
617 * next frame is processed -- and the next frame to
618 * this station is the one that will consume this
619 * counter.
620 * For now set the counter to just 1 since we do not
621 * support uAPSD yet.
622 */
623 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
624 }
625
626 /*
627 * Send this frame after DTIM -- there's a special queue
628 * reserved for this for contexts that support AP mode.
629 */
630 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
631 txq_id = ctx->mcast_queue;
632 /*
633 * The microcode will clear the more data
634 * bit in the last frame it transmits.
635 */
636 hdr->frame_control |=
637 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
638 } else
639 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
640
641 /* irqs already disabled/saved above when locking priv->lock */
642 spin_lock(&priv->sta_lock);
643
644 if (ieee80211_is_data_qos(fc)) {
645 u8 *qc = NULL;
646 qc = ieee80211_get_qos_ctl(hdr);
647 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
648
649 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
650 goto drop_unlock_sta;
651
652 seq_number = priv->stations[sta_id].tid[tid].seq_number;
653 seq_number &= IEEE80211_SCTL_SEQ;
654 hdr->seq_ctrl = hdr->seq_ctrl &
655 cpu_to_le16(IEEE80211_SCTL_FRAG);
656 hdr->seq_ctrl |= cpu_to_le16(seq_number);
657 seq_number += 0x10;
658 /* aggregation is on for this <sta,tid> */
659 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
660 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
661 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
662 is_agg = true;
663 }
664 }
665
666 tx_cmd = trans_get_tx_cmd(priv, txq_id);
667 if (unlikely(!tx_cmd))
668 goto drop_unlock_sta;
669
670 /* Copy MAC header from skb into command buffer */
671 memcpy(tx_cmd->hdr, hdr, hdr_len);
672
673 /* Total # bytes to be transmitted */
674 len = (u16)skb->len;
675 tx_cmd->len = cpu_to_le16(len);
676
677 if (info->control.hw_key)
678 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
679
680 /* TODO need this for burst mode later on */
681 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
682 iwl_dbg_log_tx_data_frame(priv, len, hdr);
683
684 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
685
686 iwl_update_stats(priv, true, fc, len);
687
688 if (trans_tx(priv, skb, tx_cmd, txq_id, fc, is_agg, ctx))
689 goto drop_unlock_sta;
690
691 if (ieee80211_is_data_qos(fc)) {
692 priv->stations[sta_id].tid[tid].tfds_in_queue++;
693 if (!ieee80211_has_morefrags(fc))
694 priv->stations[sta_id].tid[tid].seq_number = seq_number;
695 }
696
697 spin_unlock(&priv->sta_lock);
698 spin_unlock_irqrestore(&priv->lock, flags);
699
700 /*
701 * Avoid atomic ops if it isn't an associated client.
702 * Also, if this is a packet for aggregation, don't
703 * increase the counter because the ucode will stop
704 * aggregation queues when their respective station
705 * goes to sleep.
706 */
707 if (sta_priv && sta_priv->client && !is_agg)
708 atomic_inc(&sta_priv->pending_frames);
709
710 return 0;
711
712 drop_unlock_sta:
713 spin_unlock(&priv->sta_lock);
714 drop_unlock_priv:
715 spin_unlock_irqrestore(&priv->lock, flags);
716 return -1;
717 }
718
719 /*
720 * Find first available (lowest unused) Tx Queue, mark it "active".
721 * Called only when finding queue for aggregation.
722 * Should never return anything < 7, because they should already
723 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
724 */
725 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
726 {
727 int txq_id;
728
729 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
730 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
731 return txq_id;
732 return -1;
733 }
734
735 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
736 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
737 {
738 int sta_id;
739 int tx_fifo;
740 int txq_id;
741 int ret;
742 unsigned long flags;
743 struct iwl_tid_data *tid_data;
744
745 tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
746 if (unlikely(tx_fifo < 0))
747 return tx_fifo;
748
749 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
750 sta->addr, tid);
751
752 sta_id = iwl_sta_id(sta);
753 if (sta_id == IWL_INVALID_STATION) {
754 IWL_ERR(priv, "Start AGG on invalid station\n");
755 return -ENXIO;
756 }
757 if (unlikely(tid >= MAX_TID_COUNT))
758 return -EINVAL;
759
760 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
761 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
762 return -ENXIO;
763 }
764
765 txq_id = iwlagn_txq_ctx_activate_free(priv);
766 if (txq_id == -1) {
767 IWL_ERR(priv, "No free aggregation queue available\n");
768 return -ENXIO;
769 }
770
771 spin_lock_irqsave(&priv->sta_lock, flags);
772 tid_data = &priv->stations[sta_id].tid[tid];
773 *ssn = SEQ_TO_SN(tid_data->seq_number);
774 tid_data->agg.txq_id = txq_id;
775 tid_data->agg.tx_fifo = tx_fifo;
776 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
777 spin_unlock_irqrestore(&priv->sta_lock, flags);
778
779 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
780 if (ret)
781 return ret;
782
783 spin_lock_irqsave(&priv->sta_lock, flags);
784 tid_data = &priv->stations[sta_id].tid[tid];
785 if (tid_data->tfds_in_queue == 0) {
786 IWL_DEBUG_HT(priv, "HW queue is empty\n");
787 tid_data->agg.state = IWL_AGG_ON;
788 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
789 } else {
790 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
791 tid_data->tfds_in_queue);
792 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
793 }
794 spin_unlock_irqrestore(&priv->sta_lock, flags);
795 return ret;
796 }
797
798 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
799 struct ieee80211_sta *sta, u16 tid)
800 {
801 int tx_fifo_id, txq_id, sta_id, ssn;
802 struct iwl_tid_data *tid_data;
803 int write_ptr, read_ptr;
804 unsigned long flags;
805
806 tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
807 if (unlikely(tx_fifo_id < 0))
808 return tx_fifo_id;
809
810 sta_id = iwl_sta_id(sta);
811
812 if (sta_id == IWL_INVALID_STATION) {
813 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
814 return -ENXIO;
815 }
816
817 spin_lock_irqsave(&priv->sta_lock, flags);
818
819 tid_data = &priv->stations[sta_id].tid[tid];
820 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
821 txq_id = tid_data->agg.txq_id;
822
823 switch (priv->stations[sta_id].tid[tid].agg.state) {
824 case IWL_EMPTYING_HW_QUEUE_ADDBA:
825 /*
826 * This can happen if the peer stops aggregation
827 * again before we've had a chance to drain the
828 * queue we selected previously, i.e. before the
829 * session was really started completely.
830 */
831 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
832 goto turn_off;
833 case IWL_AGG_ON:
834 break;
835 default:
836 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
837 }
838
839 write_ptr = priv->txq[txq_id].q.write_ptr;
840 read_ptr = priv->txq[txq_id].q.read_ptr;
841
842 /* The queue is not empty */
843 if (write_ptr != read_ptr) {
844 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
845 priv->stations[sta_id].tid[tid].agg.state =
846 IWL_EMPTYING_HW_QUEUE_DELBA;
847 spin_unlock_irqrestore(&priv->sta_lock, flags);
848 return 0;
849 }
850
851 IWL_DEBUG_HT(priv, "HW queue is empty\n");
852 turn_off:
853 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
854
855 /* do not restore/save irqs */
856 spin_unlock(&priv->sta_lock);
857 spin_lock(&priv->lock);
858
859 /*
860 * the only reason this call can fail is queue number out of range,
861 * which can happen if uCode is reloaded and all the station
862 * information are lost. if it is outside the range, there is no need
863 * to deactivate the uCode queue, just return "success" to allow
864 * mac80211 to clean up it own data.
865 */
866 iwlagn_txq_agg_disable(priv, txq_id, ssn, tx_fifo_id);
867 spin_unlock_irqrestore(&priv->lock, flags);
868
869 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
870
871 return 0;
872 }
873
874 int iwlagn_txq_check_empty(struct iwl_priv *priv,
875 int sta_id, u8 tid, int txq_id)
876 {
877 struct iwl_queue *q = &priv->txq[txq_id].q;
878 u8 *addr = priv->stations[sta_id].sta.sta.addr;
879 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
880 struct iwl_rxon_context *ctx;
881
882 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
883
884 lockdep_assert_held(&priv->sta_lock);
885
886 switch (priv->stations[sta_id].tid[tid].agg.state) {
887 case IWL_EMPTYING_HW_QUEUE_DELBA:
888 /* We are reclaiming the last packet of the */
889 /* aggregated HW queue */
890 if ((txq_id == tid_data->agg.txq_id) &&
891 (q->read_ptr == q->write_ptr)) {
892 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
893 int tx_fifo = get_fifo_from_tid(ctx, tid);
894 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
895 iwlagn_txq_agg_disable(priv, txq_id, ssn, tx_fifo);
896 tid_data->agg.state = IWL_AGG_OFF;
897 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
898 }
899 break;
900 case IWL_EMPTYING_HW_QUEUE_ADDBA:
901 /* We are reclaiming the last packet of the queue */
902 if (tid_data->tfds_in_queue == 0) {
903 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
904 tid_data->agg.state = IWL_AGG_ON;
905 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
906 }
907 break;
908 }
909
910 return 0;
911 }
912
913 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
914 struct iwl_rxon_context *ctx,
915 const u8 *addr1)
916 {
917 struct ieee80211_sta *sta;
918 struct iwl_station_priv *sta_priv;
919
920 rcu_read_lock();
921 sta = ieee80211_find_sta(ctx->vif, addr1);
922 if (sta) {
923 sta_priv = (void *)sta->drv_priv;
924 /* avoid atomic ops if this isn't a client */
925 if (sta_priv->client &&
926 atomic_dec_return(&sta_priv->pending_frames) == 0)
927 ieee80211_sta_block_awake(priv->hw, sta, false);
928 }
929 rcu_read_unlock();
930 }
931
932 static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
933 bool is_agg)
934 {
935 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
936
937 if (!is_agg)
938 iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
939
940 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
941 }
942
943 int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
944 {
945 struct iwl_tx_queue *txq = &priv->txq[txq_id];
946 struct iwl_queue *q = &txq->q;
947 struct iwl_tx_info *tx_info;
948 int nfreed = 0;
949 struct ieee80211_hdr *hdr;
950
951 if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
952 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
953 "index %d is out of range [0-%d] %d %d.\n", __func__,
954 txq_id, index, q->n_bd, q->write_ptr, q->read_ptr);
955 return 0;
956 }
957
958 for (index = iwl_queue_inc_wrap(index, q->n_bd);
959 q->read_ptr != index;
960 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
961
962 tx_info = &txq->txb[txq->q.read_ptr];
963
964 if (WARN_ON_ONCE(tx_info->skb == NULL))
965 continue;
966
967 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
968 if (ieee80211_is_data_qos(hdr->frame_control))
969 nfreed++;
970
971 iwlagn_tx_status(priv, tx_info,
972 txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
973 tx_info->skb = NULL;
974
975 iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
976
977 iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr);
978 }
979 return nfreed;
980 }
981
982 /**
983 * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
984 *
985 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
986 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
987 */
988 static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
989 struct iwl_ht_agg *agg,
990 struct iwl_compressed_ba_resp *ba_resp)
991
992 {
993 int sh;
994 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
995 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
996 struct ieee80211_tx_info *info;
997 u64 bitmap, sent_bitmap;
998
999 if (unlikely(!agg->wait_for_ba)) {
1000 if (unlikely(ba_resp->bitmap))
1001 IWL_ERR(priv, "Received BA when not expected\n");
1002 return -EINVAL;
1003 }
1004
1005 /* Mark that the expected block-ack response arrived */
1006 agg->wait_for_ba = 0;
1007 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
1008
1009 /* Calculate shift to align block-ack bits with our Tx window bits */
1010 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
1011 if (sh < 0)
1012 sh += 0x100;
1013
1014 /*
1015 * Check for success or failure according to the
1016 * transmitted bitmap and block-ack bitmap
1017 */
1018 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
1019 sent_bitmap = bitmap & agg->bitmap;
1020
1021 /* Sanity check values reported by uCode */
1022 if (ba_resp->txed_2_done > ba_resp->txed) {
1023 IWL_DEBUG_TX_REPLY(priv,
1024 "bogus sent(%d) and ack(%d) count\n",
1025 ba_resp->txed, ba_resp->txed_2_done);
1026 /*
1027 * set txed_2_done = txed,
1028 * so it won't impact rate scale
1029 */
1030 ba_resp->txed = ba_resp->txed_2_done;
1031 }
1032 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1033 ba_resp->txed, ba_resp->txed_2_done);
1034
1035 /* Find the first ACKed frame to store the TX status */
1036 while (sent_bitmap && !(sent_bitmap & 1)) {
1037 agg->start_idx = (agg->start_idx + 1) & 0xff;
1038 sent_bitmap >>= 1;
1039 }
1040
1041 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
1042 memset(&info->status, 0, sizeof(info->status));
1043 info->flags |= IEEE80211_TX_STAT_ACK;
1044 info->flags |= IEEE80211_TX_STAT_AMPDU;
1045 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1046 info->status.ampdu_len = ba_resp->txed;
1047 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
1048
1049 return 0;
1050 }
1051
1052 /**
1053 * translate ucode response to mac80211 tx status control values
1054 */
1055 void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
1056 struct ieee80211_tx_info *info)
1057 {
1058 struct ieee80211_tx_rate *r = &info->control.rates[0];
1059
1060 info->antenna_sel_tx =
1061 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1062 if (rate_n_flags & RATE_MCS_HT_MSK)
1063 r->flags |= IEEE80211_TX_RC_MCS;
1064 if (rate_n_flags & RATE_MCS_GF_MSK)
1065 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1066 if (rate_n_flags & RATE_MCS_HT40_MSK)
1067 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1068 if (rate_n_flags & RATE_MCS_DUP_MSK)
1069 r->flags |= IEEE80211_TX_RC_DUP_DATA;
1070 if (rate_n_flags & RATE_MCS_SGI_MSK)
1071 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1072 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
1073 }
1074
1075 /**
1076 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1077 *
1078 * Handles block-acknowledge notification from device, which reports success
1079 * of frames sent via aggregation.
1080 */
1081 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1082 struct iwl_rx_mem_buffer *rxb)
1083 {
1084 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1085 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1086 struct iwl_tx_queue *txq = NULL;
1087 struct iwl_ht_agg *agg;
1088 int index;
1089 int sta_id;
1090 int tid;
1091 unsigned long flags;
1092
1093 /* "flow" corresponds to Tx queue */
1094 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1095
1096 /* "ssn" is start of block-ack Tx window, corresponds to index
1097 * (in Tx queue's circular buffer) of first TFD/frame in window */
1098 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1099
1100 if (scd_flow >= priv->hw_params.max_txq_num) {
1101 IWL_ERR(priv,
1102 "BUG_ON scd_flow is bigger than number of queues\n");
1103 return;
1104 }
1105
1106 txq = &priv->txq[scd_flow];
1107 sta_id = ba_resp->sta_id;
1108 tid = ba_resp->tid;
1109 agg = &priv->stations[sta_id].tid[tid].agg;
1110 if (unlikely(agg->txq_id != scd_flow)) {
1111 /*
1112 * FIXME: this is a uCode bug which need to be addressed,
1113 * log the information and return for now!
1114 * since it is possible happen very often and in order
1115 * not to fill the syslog, don't enable the logging by default
1116 */
1117 IWL_DEBUG_TX_REPLY(priv,
1118 "BA scd_flow %d does not match txq_id %d\n",
1119 scd_flow, agg->txq_id);
1120 return;
1121 }
1122
1123 /* Find index just before block-ack window */
1124 index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
1125
1126 spin_lock_irqsave(&priv->sta_lock, flags);
1127
1128 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1129 "sta_id = %d\n",
1130 agg->wait_for_ba,
1131 (u8 *) &ba_resp->sta_addr_lo32,
1132 ba_resp->sta_id);
1133 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
1134 "%d, scd_ssn = %d\n",
1135 ba_resp->tid,
1136 ba_resp->seq_ctl,
1137 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1138 ba_resp->scd_flow,
1139 ba_resp->scd_ssn);
1140 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
1141 agg->start_idx,
1142 (unsigned long long)agg->bitmap);
1143
1144 /* Update driver's record of ACK vs. not for each frame in window */
1145 iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
1146
1147 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1148 * block-ack window (we assume that they've been successfully
1149 * transmitted ... if not, it's too late anyway). */
1150 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
1151 /* calculate mac80211 ampdu sw queue to wake */
1152 int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
1153 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1154
1155 if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
1156 priv->mac80211_registered &&
1157 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
1158 iwl_wake_queue(priv, txq);
1159
1160 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
1161 }
1162
1163 spin_unlock_irqrestore(&priv->sta_lock, flags);
1164 }
1165
1166 #ifdef CONFIG_IWLWIFI_DEBUG
1167 const char *iwl_get_tx_fail_reason(u32 status)
1168 {
1169 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1170 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1171
1172 switch (status & TX_STATUS_MSK) {
1173 case TX_STATUS_SUCCESS:
1174 return "SUCCESS";
1175 TX_STATUS_POSTPONE(DELAY);
1176 TX_STATUS_POSTPONE(FEW_BYTES);
1177 TX_STATUS_POSTPONE(BT_PRIO);
1178 TX_STATUS_POSTPONE(QUIET_PERIOD);
1179 TX_STATUS_POSTPONE(CALC_TTAK);
1180 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1181 TX_STATUS_FAIL(SHORT_LIMIT);
1182 TX_STATUS_FAIL(LONG_LIMIT);
1183 TX_STATUS_FAIL(FIFO_UNDERRUN);
1184 TX_STATUS_FAIL(DRAIN_FLOW);
1185 TX_STATUS_FAIL(RFKILL_FLUSH);
1186 TX_STATUS_FAIL(LIFE_EXPIRE);
1187 TX_STATUS_FAIL(DEST_PS);
1188 TX_STATUS_FAIL(HOST_ABORTED);
1189 TX_STATUS_FAIL(BT_RETRY);
1190 TX_STATUS_FAIL(STA_INVALID);
1191 TX_STATUS_FAIL(FRAG_DROPPED);
1192 TX_STATUS_FAIL(TID_DISABLE);
1193 TX_STATUS_FAIL(FIFO_FLUSHED);
1194 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
1195 TX_STATUS_FAIL(PASSIVE_NO_RX);
1196 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
1197 }
1198
1199 return "UNKNOWN";
1200
1201 #undef TX_STATUS_FAIL
1202 #undef TX_STATUS_POSTPONE
1203 }
1204 #endif /* CONFIG_IWLWIFI_DEBUG */
Linux kernel - Deliverables
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