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iwlwifi: split the drivers for agn and legacy devices 3945/4965
[deliverable/linux.git] / drivers / net / wireless / iwlegacy / iwl-4965-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-4965-hw.h"
41 #include "iwl-4965.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), 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 iwl4965_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
90 iwl4965_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 * handle build REPLY_TX command notification.
101 */
102 static void iwl4965_tx_cmd_build_basic(struct iwl_priv *priv,
103 struct sk_buff *skb,
104 struct iwl_tx_cmd *tx_cmd,
105 struct ieee80211_tx_info *info,
106 struct ieee80211_hdr *hdr,
107 u8 std_id)
108 {
109 __le16 fc = hdr->frame_control;
110 __le32 tx_flags = tx_cmd->tx_flags;
111
112 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
113 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
114 tx_flags |= TX_CMD_FLG_ACK_MSK;
115 if (ieee80211_is_mgmt(fc))
116 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
117 if (ieee80211_is_probe_resp(fc) &&
118 !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
119 tx_flags |= TX_CMD_FLG_TSF_MSK;
120 } else {
121 tx_flags &= (~TX_CMD_FLG_ACK_MSK);
122 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
123 }
124
125 if (ieee80211_is_back_req(fc))
126 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
127
128 tx_cmd->sta_id = std_id;
129 if (ieee80211_has_morefrags(fc))
130 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
131
132 if (ieee80211_is_data_qos(fc)) {
133 u8 *qc = ieee80211_get_qos_ctl(hdr);
134 tx_cmd->tid_tspec = qc[0] & 0xf;
135 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
136 } else {
137 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
138 }
139
140 iwl_legacy_tx_cmd_protection(priv, info, fc, &tx_flags);
141
142 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
143 if (ieee80211_is_mgmt(fc)) {
144 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
145 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
146 else
147 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
148 } else {
149 tx_cmd->timeout.pm_frame_timeout = 0;
150 }
151
152 tx_cmd->driver_txop = 0;
153 tx_cmd->tx_flags = tx_flags;
154 tx_cmd->next_frame_len = 0;
155 }
156
157 #define RTS_DFAULT_RETRY_LIMIT 60
158
159 static void iwl4965_tx_cmd_build_rate(struct iwl_priv *priv,
160 struct iwl_tx_cmd *tx_cmd,
161 struct ieee80211_tx_info *info,
162 __le16 fc)
163 {
164 u32 rate_flags;
165 int rate_idx;
166 u8 rts_retry_limit;
167 u8 data_retry_limit;
168 u8 rate_plcp;
169
170 /* Set retry limit on DATA packets and Probe Responses*/
171 if (ieee80211_is_probe_resp(fc))
172 data_retry_limit = 3;
173 else
174 data_retry_limit = IWL4965_DEFAULT_TX_RETRY;
175 tx_cmd->data_retry_limit = data_retry_limit;
176
177 /* Set retry limit on RTS packets */
178 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
179 if (data_retry_limit < rts_retry_limit)
180 rts_retry_limit = data_retry_limit;
181 tx_cmd->rts_retry_limit = rts_retry_limit;
182
183 /* DATA packets will use the uCode station table for rate/antenna
184 * selection */
185 if (ieee80211_is_data(fc)) {
186 tx_cmd->initial_rate_index = 0;
187 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
188 return;
189 }
190
191 /**
192 * If the current TX rate stored in mac80211 has the MCS bit set, it's
193 * not really a TX rate. Thus, we use the lowest supported rate for
194 * this band. Also use the lowest supported rate if the stored rate
195 * index is invalid.
196 */
197 rate_idx = info->control.rates[0].idx;
198 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
199 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
200 rate_idx = rate_lowest_index(&priv->bands[info->band],
201 info->control.sta);
202 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
203 if (info->band == IEEE80211_BAND_5GHZ)
204 rate_idx += IWL_FIRST_OFDM_RATE;
205 /* Get PLCP rate for tx_cmd->rate_n_flags */
206 rate_plcp = iwl_rates[rate_idx].plcp;
207 /* Zero out flags for this packet */
208 rate_flags = 0;
209
210 /* Set CCK flag as needed */
211 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
212 rate_flags |= RATE_MCS_CCK_MSK;
213
214 /* Set up antennas */
215 priv->mgmt_tx_ant = iwl4965_toggle_tx_ant(priv, priv->mgmt_tx_ant,
216 priv->hw_params.valid_tx_ant);
217
218 rate_flags |= iwl4965_ant_idx_to_flags(priv->mgmt_tx_ant);
219
220 /* Set the rate in the TX cmd */
221 tx_cmd->rate_n_flags = iwl4965_hw_set_rate_n_flags(rate_plcp, rate_flags);
222 }
223
224 static void iwl4965_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
225 struct ieee80211_tx_info *info,
226 struct iwl_tx_cmd *tx_cmd,
227 struct sk_buff *skb_frag,
228 int sta_id)
229 {
230 struct ieee80211_key_conf *keyconf = info->control.hw_key;
231
232 switch (keyconf->cipher) {
233 case WLAN_CIPHER_SUITE_CCMP:
234 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
235 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
236 if (info->flags & IEEE80211_TX_CTL_AMPDU)
237 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
238 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
239 break;
240
241 case WLAN_CIPHER_SUITE_TKIP:
242 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
243 ieee80211_get_tkip_key(keyconf, skb_frag,
244 IEEE80211_TKIP_P2_KEY, tx_cmd->key);
245 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
246 break;
247
248 case WLAN_CIPHER_SUITE_WEP104:
249 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
250 /* fall through */
251 case WLAN_CIPHER_SUITE_WEP40:
252 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
253 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
254
255 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
256
257 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
258 "with key %d\n", keyconf->keyidx);
259 break;
260
261 default:
262 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
263 break;
264 }
265 }
266
267 /*
268 * start REPLY_TX command process
269 */
270 int iwl4965_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
271 {
272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
274 struct ieee80211_sta *sta = info->control.sta;
275 struct iwl_station_priv *sta_priv = NULL;
276 struct iwl_tx_queue *txq;
277 struct iwl_queue *q;
278 struct iwl_device_cmd *out_cmd;
279 struct iwl_cmd_meta *out_meta;
280 struct iwl_tx_cmd *tx_cmd;
281 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
282 int txq_id;
283 dma_addr_t phys_addr;
284 dma_addr_t txcmd_phys;
285 dma_addr_t scratch_phys;
286 u16 len, firstlen, secondlen;
287 u16 seq_number = 0;
288 __le16 fc;
289 u8 hdr_len;
290 u8 sta_id;
291 u8 wait_write_ptr = 0;
292 u8 tid = 0;
293 u8 *qc = NULL;
294 unsigned long flags;
295 bool is_agg = false;
296
297 if (info->control.vif)
298 ctx = iwl_legacy_rxon_ctx_from_vif(info->control.vif);
299
300 spin_lock_irqsave(&priv->lock, flags);
301 if (iwl_legacy_is_rfkill(priv)) {
302 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
303 goto drop_unlock;
304 }
305
306 fc = hdr->frame_control;
307
308 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
309 if (ieee80211_is_auth(fc))
310 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
311 else if (ieee80211_is_assoc_req(fc))
312 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
313 else if (ieee80211_is_reassoc_req(fc))
314 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
315 #endif
316
317 hdr_len = ieee80211_hdrlen(fc);
318
319 /* Find index into station table for destination station */
320 sta_id = iwl_legacy_sta_id_or_broadcast(priv, ctx, info->control.sta);
321 if (sta_id == IWL_INVALID_STATION) {
322 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
323 hdr->addr1);
324 goto drop_unlock;
325 }
326
327 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
328
329 if (sta)
330 sta_priv = (void *)sta->drv_priv;
331
332 if (sta_priv && sta_priv->asleep &&
333 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
334 /*
335 * This sends an asynchronous command to the device,
336 * but we can rely on it being processed before the
337 * next frame is processed -- and the next frame to
338 * this station is the one that will consume this
339 * counter.
340 * For now set the counter to just 1 since we do not
341 * support uAPSD yet.
342 */
343 iwl4965_sta_modify_sleep_tx_count(priv, sta_id, 1);
344 }
345
346 /*
347 * Send this frame after DTIM -- there's a special queue
348 * reserved for this for contexts that support AP mode.
349 */
350 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
351 txq_id = ctx->mcast_queue;
352 /*
353 * The microcode will clear the more data
354 * bit in the last frame it transmits.
355 */
356 hdr->frame_control |=
357 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
358 } else
359 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
360
361 /* irqs already disabled/saved above when locking priv->lock */
362 spin_lock(&priv->sta_lock);
363
364 if (ieee80211_is_data_qos(fc)) {
365 qc = ieee80211_get_qos_ctl(hdr);
366 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
367 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT)) {
368 spin_unlock(&priv->sta_lock);
369 goto drop_unlock;
370 }
371 seq_number = priv->stations[sta_id].tid[tid].seq_number;
372 seq_number &= IEEE80211_SCTL_SEQ;
373 hdr->seq_ctrl = hdr->seq_ctrl &
374 cpu_to_le16(IEEE80211_SCTL_FRAG);
375 hdr->seq_ctrl |= cpu_to_le16(seq_number);
376 seq_number += 0x10;
377 /* aggregation is on for this <sta,tid> */
378 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
379 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
380 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
381 is_agg = true;
382 }
383 }
384
385 txq = &priv->txq[txq_id];
386 q = &txq->q;
387
388 if (unlikely(iwl_legacy_queue_space(q) < q->high_mark)) {
389 spin_unlock(&priv->sta_lock);
390 goto drop_unlock;
391 }
392
393 if (ieee80211_is_data_qos(fc)) {
394 priv->stations[sta_id].tid[tid].tfds_in_queue++;
395 if (!ieee80211_has_morefrags(fc))
396 priv->stations[sta_id].tid[tid].seq_number = seq_number;
397 }
398
399 spin_unlock(&priv->sta_lock);
400
401 /* Set up driver data for this TFD */
402 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
403 txq->txb[q->write_ptr].skb = skb;
404 txq->txb[q->write_ptr].ctx = ctx;
405
406 /* Set up first empty entry in queue's array of Tx/cmd buffers */
407 out_cmd = txq->cmd[q->write_ptr];
408 out_meta = &txq->meta[q->write_ptr];
409 tx_cmd = &out_cmd->cmd.tx;
410 memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
411 memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd));
412
413 /*
414 * Set up the Tx-command (not MAC!) header.
415 * Store the chosen Tx queue and TFD index within the sequence field;
416 * after Tx, uCode's Tx response will return this value so driver can
417 * locate the frame within the tx queue and do post-tx processing.
418 */
419 out_cmd->hdr.cmd = REPLY_TX;
420 out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
421 INDEX_TO_SEQ(q->write_ptr)));
422
423 /* Copy MAC header from skb into command buffer */
424 memcpy(tx_cmd->hdr, hdr, hdr_len);
425
426
427 /* Total # bytes to be transmitted */
428 len = (u16)skb->len;
429 tx_cmd->len = cpu_to_le16(len);
430
431 if (info->control.hw_key)
432 iwl4965_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
433
434 /* TODO need this for burst mode later on */
435 iwl4965_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
436 iwl_legacy_dbg_log_tx_data_frame(priv, len, hdr);
437
438 iwl4965_tx_cmd_build_rate(priv, tx_cmd, info, fc);
439
440 iwl_legacy_update_stats(priv, true, fc, len);
441 /*
442 * Use the first empty entry in this queue's command buffer array
443 * to contain the Tx command and MAC header concatenated together
444 * (payload data will be in another buffer).
445 * Size of this varies, due to varying MAC header length.
446 * If end is not dword aligned, we'll have 2 extra bytes at the end
447 * of the MAC header (device reads on dword boundaries).
448 * We'll tell device about this padding later.
449 */
450 len = sizeof(struct iwl_tx_cmd) +
451 sizeof(struct iwl_cmd_header) + hdr_len;
452 firstlen = (len + 3) & ~3;
453
454 /* Tell NIC about any 2-byte padding after MAC header */
455 if (firstlen != len)
456 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
457
458 /* Physical address of this Tx command's header (not MAC header!),
459 * within command buffer array. */
460 txcmd_phys = pci_map_single(priv->pci_dev,
461 &out_cmd->hdr, firstlen,
462 PCI_DMA_BIDIRECTIONAL);
463 dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
464 dma_unmap_len_set(out_meta, len, firstlen);
465 /* Add buffer containing Tx command and MAC(!) header to TFD's
466 * first entry */
467 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
468 txcmd_phys, firstlen, 1, 0);
469
470 if (!ieee80211_has_morefrags(hdr->frame_control)) {
471 txq->need_update = 1;
472 } else {
473 wait_write_ptr = 1;
474 txq->need_update = 0;
475 }
476
477 /* Set up TFD's 2nd entry to point directly to remainder of skb,
478 * if any (802.11 null frames have no payload). */
479 secondlen = skb->len - hdr_len;
480 if (secondlen > 0) {
481 phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
482 secondlen, PCI_DMA_TODEVICE);
483 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
484 phys_addr, secondlen,
485 0, 0);
486 }
487
488 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
489 offsetof(struct iwl_tx_cmd, scratch);
490
491 /* take back ownership of DMA buffer to enable update */
492 pci_dma_sync_single_for_cpu(priv->pci_dev, txcmd_phys,
493 firstlen, PCI_DMA_BIDIRECTIONAL);
494 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
495 tx_cmd->dram_msb_ptr = iwl_legacy_get_dma_hi_addr(scratch_phys);
496
497 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
498 le16_to_cpu(out_cmd->hdr.sequence));
499 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
500 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
501 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
502
503 /* Set up entry for this TFD in Tx byte-count array */
504 if (info->flags & IEEE80211_TX_CTL_AMPDU)
505 priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq,
506 le16_to_cpu(tx_cmd->len));
507
508 pci_dma_sync_single_for_device(priv->pci_dev, txcmd_phys,
509 firstlen, PCI_DMA_BIDIRECTIONAL);
510
511 trace_iwlwifi_legacy_dev_tx(priv,
512 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
513 sizeof(struct iwl_tfd),
514 &out_cmd->hdr, firstlen,
515 skb->data + hdr_len, secondlen);
516
517 /* Tell device the write index *just past* this latest filled TFD */
518 q->write_ptr = iwl_legacy_queue_inc_wrap(q->write_ptr, q->n_bd);
519 iwl_legacy_txq_update_write_ptr(priv, txq);
520 spin_unlock_irqrestore(&priv->lock, flags);
521
522 /*
523 * At this point the frame is "transmitted" successfully
524 * and we will get a TX status notification eventually,
525 * regardless of the value of ret. "ret" only indicates
526 * whether or not we should update the write pointer.
527 */
528
529 /*
530 * Avoid atomic ops if it isn't an associated client.
531 * Also, if this is a packet for aggregation, don't
532 * increase the counter because the ucode will stop
533 * aggregation queues when their respective station
534 * goes to sleep.
535 */
536 if (sta_priv && sta_priv->client && !is_agg)
537 atomic_inc(&sta_priv->pending_frames);
538
539 if ((iwl_legacy_queue_space(q) < q->high_mark) &&
540 priv->mac80211_registered) {
541 if (wait_write_ptr) {
542 spin_lock_irqsave(&priv->lock, flags);
543 txq->need_update = 1;
544 iwl_legacy_txq_update_write_ptr(priv, txq);
545 spin_unlock_irqrestore(&priv->lock, flags);
546 } else {
547 iwl_legacy_stop_queue(priv, txq);
548 }
549 }
550
551 return 0;
552
553 drop_unlock:
554 spin_unlock_irqrestore(&priv->lock, flags);
555 return -1;
556 }
557
558 static inline int iwl4965_alloc_dma_ptr(struct iwl_priv *priv,
559 struct iwl_dma_ptr *ptr, size_t size)
560 {
561 ptr->addr = dma_alloc_coherent(&priv->pci_dev->dev, size, &ptr->dma,
562 GFP_KERNEL);
563 if (!ptr->addr)
564 return -ENOMEM;
565 ptr->size = size;
566 return 0;
567 }
568
569 static inline void iwl4965_free_dma_ptr(struct iwl_priv *priv,
570 struct iwl_dma_ptr *ptr)
571 {
572 if (unlikely(!ptr->addr))
573 return;
574
575 dma_free_coherent(&priv->pci_dev->dev, ptr->size, ptr->addr, ptr->dma);
576 memset(ptr, 0, sizeof(*ptr));
577 }
578
579 /**
580 * iwl4965_hw_txq_ctx_free - Free TXQ Context
581 *
582 * Destroy all TX DMA queues and structures
583 */
584 void iwl4965_hw_txq_ctx_free(struct iwl_priv *priv)
585 {
586 int txq_id;
587
588 /* Tx queues */
589 if (priv->txq) {
590 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
591 if (txq_id == priv->cmd_queue)
592 iwl_legacy_cmd_queue_free(priv);
593 else
594 iwl_legacy_tx_queue_free(priv, txq_id);
595 }
596 iwl4965_free_dma_ptr(priv, &priv->kw);
597
598 iwl4965_free_dma_ptr(priv, &priv->scd_bc_tbls);
599
600 /* free tx queue structure */
601 iwl_legacy_txq_mem(priv);
602 }
603
604 /**
605 * iwl4965_txq_ctx_alloc - allocate TX queue context
606 * Allocate all Tx DMA structures and initialize them
607 *
608 * @param priv
609 * @return error code
610 */
611 int iwl4965_txq_ctx_alloc(struct iwl_priv *priv)
612 {
613 int ret;
614 int txq_id, slots_num;
615 unsigned long flags;
616
617 /* Free all tx/cmd queues and keep-warm buffer */
618 iwl4965_hw_txq_ctx_free(priv);
619
620 ret = iwl4965_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
621 priv->hw_params.scd_bc_tbls_size);
622 if (ret) {
623 IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
624 goto error_bc_tbls;
625 }
626 /* Alloc keep-warm buffer */
627 ret = iwl4965_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
628 if (ret) {
629 IWL_ERR(priv, "Keep Warm allocation failed\n");
630 goto error_kw;
631 }
632
633 /* allocate tx queue structure */
634 ret = iwl_legacy_alloc_txq_mem(priv);
635 if (ret)
636 goto error;
637
638 spin_lock_irqsave(&priv->lock, flags);
639
640 /* Turn off all Tx DMA fifos */
641 iwl4965_txq_set_sched(priv, 0);
642
643 /* Tell NIC where to find the "keep warm" buffer */
644 iwl_legacy_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
645
646 spin_unlock_irqrestore(&priv->lock, flags);
647
648 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
649 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
650 slots_num = (txq_id == priv->cmd_queue) ?
651 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
652 ret = iwl_legacy_tx_queue_init(priv,
653 &priv->txq[txq_id], slots_num,
654 txq_id);
655 if (ret) {
656 IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
657 goto error;
658 }
659 }
660
661 return ret;
662
663 error:
664 iwl4965_hw_txq_ctx_free(priv);
665 iwl4965_free_dma_ptr(priv, &priv->kw);
666 error_kw:
667 iwl4965_free_dma_ptr(priv, &priv->scd_bc_tbls);
668 error_bc_tbls:
669 return ret;
670 }
671
672 void iwl4965_txq_ctx_reset(struct iwl_priv *priv)
673 {
674 int txq_id, slots_num;
675 unsigned long flags;
676
677 spin_lock_irqsave(&priv->lock, flags);
678
679 /* Turn off all Tx DMA fifos */
680 iwl4965_txq_set_sched(priv, 0);
681
682 /* Tell NIC where to find the "keep warm" buffer */
683 iwl_legacy_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
684
685 spin_unlock_irqrestore(&priv->lock, flags);
686
687 /* Alloc and init all Tx queues, including the command queue (#4) */
688 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
689 slots_num = txq_id == priv->cmd_queue ?
690 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
691 iwl_legacy_tx_queue_reset(priv, &priv->txq[txq_id],
692 slots_num, txq_id);
693 }
694 }
695
696 /**
697 * iwl4965_txq_ctx_stop - Stop all Tx DMA channels
698 */
699 void iwl4965_txq_ctx_stop(struct iwl_priv *priv)
700 {
701 int ch;
702 unsigned long flags;
703
704 /* Turn off all Tx DMA fifos */
705 spin_lock_irqsave(&priv->lock, flags);
706
707 iwl4965_txq_set_sched(priv, 0);
708
709 /* Stop each Tx DMA channel, and wait for it to be idle */
710 for (ch = 0; ch < priv->hw_params.dma_chnl_num; ch++) {
711 iwl_legacy_write_direct32(priv,
712 FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
713 if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
714 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
715 1000))
716 IWL_ERR(priv, "Failing on timeout while stopping"
717 " DMA channel %d [0x%08x]", ch,
718 iwl_legacy_read_direct32(priv,
719 FH_TSSR_TX_STATUS_REG));
720 }
721 spin_unlock_irqrestore(&priv->lock, flags);
722 }
723
724 /*
725 * Find first available (lowest unused) Tx Queue, mark it "active".
726 * Called only when finding queue for aggregation.
727 * Should never return anything < 7, because they should already
728 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
729 */
730 static int iwl4965_txq_ctx_activate_free(struct iwl_priv *priv)
731 {
732 int txq_id;
733
734 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
735 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
736 return txq_id;
737 return -1;
738 }
739
740 /**
741 * iwl4965_tx_queue_stop_scheduler - Stop queue, but keep configuration
742 */
743 static void iwl4965_tx_queue_stop_scheduler(struct iwl_priv *priv,
744 u16 txq_id)
745 {
746 /* Simply stop the queue, but don't change any configuration;
747 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
748 iwl_legacy_write_prph(priv,
749 IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
750 (0 << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
751 (1 << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
752 }
753
754 /**
755 * iwl4965_tx_queue_set_q2ratid - Map unique receiver/tid combination to a queue
756 */
757 static int iwl4965_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
758 u16 txq_id)
759 {
760 u32 tbl_dw_addr;
761 u32 tbl_dw;
762 u16 scd_q2ratid;
763
764 scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;
765
766 tbl_dw_addr = priv->scd_base_addr +
767 IWL49_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
768
769 tbl_dw = iwl_legacy_read_targ_mem(priv, tbl_dw_addr);
770
771 if (txq_id & 0x1)
772 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
773 else
774 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
775
776 iwl_legacy_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
777
778 return 0;
779 }
780
781 /**
782 * iwl4965_tx_queue_agg_enable - Set up & enable aggregation for selected queue
783 *
784 * NOTE: txq_id must be greater than IWL49_FIRST_AMPDU_QUEUE,
785 * i.e. it must be one of the higher queues used for aggregation
786 */
787 static int iwl4965_txq_agg_enable(struct iwl_priv *priv, int txq_id,
788 int tx_fifo, int sta_id, int tid, u16 ssn_idx)
789 {
790 unsigned long flags;
791 u16 ra_tid;
792 int ret;
793
794 if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
795 (IWL49_FIRST_AMPDU_QUEUE +
796 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
797 IWL_WARN(priv,
798 "queue number out of range: %d, must be %d to %d\n",
799 txq_id, IWL49_FIRST_AMPDU_QUEUE,
800 IWL49_FIRST_AMPDU_QUEUE +
801 priv->cfg->base_params->num_of_ampdu_queues - 1);
802 return -EINVAL;
803 }
804
805 ra_tid = BUILD_RAxTID(sta_id, tid);
806
807 /* Modify device's station table to Tx this TID */
808 ret = iwl4965_sta_tx_modify_enable_tid(priv, sta_id, tid);
809 if (ret)
810 return ret;
811
812 spin_lock_irqsave(&priv->lock, flags);
813
814 /* Stop this Tx queue before configuring it */
815 iwl4965_tx_queue_stop_scheduler(priv, txq_id);
816
817 /* Map receiver-address / traffic-ID to this queue */
818 iwl4965_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
819
820 /* Set this queue as a chain-building queue */
821 iwl_legacy_set_bits_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, (1 << txq_id));
822
823 /* Place first TFD at index corresponding to start sequence number.
824 * Assumes that ssn_idx is valid (!= 0xFFF) */
825 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
826 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
827 iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
828
829 /* Set up Tx window size and frame limit for this queue */
830 iwl_legacy_write_targ_mem(priv,
831 priv->scd_base_addr + IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id),
832 (SCD_WIN_SIZE << IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
833 IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
834
835 iwl_legacy_write_targ_mem(priv, priv->scd_base_addr +
836 IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
837 (SCD_FRAME_LIMIT << IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS)
838 & IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);
839
840 iwl_legacy_set_bits_prph(priv, IWL49_SCD_INTERRUPT_MASK, (1 << txq_id));
841
842 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
843 iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
844
845 spin_unlock_irqrestore(&priv->lock, flags);
846
847 return 0;
848 }
849
850
851 int iwl4965_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
852 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
853 {
854 int sta_id;
855 int tx_fifo;
856 int txq_id;
857 int ret;
858 unsigned long flags;
859 struct iwl_tid_data *tid_data;
860
861 tx_fifo = iwl4965_get_fifo_from_tid(iwl_legacy_rxon_ctx_from_vif(vif), tid);
862 if (unlikely(tx_fifo < 0))
863 return tx_fifo;
864
865 IWL_WARN(priv, "%s on ra = %pM tid = %d\n",
866 __func__, sta->addr, tid);
867
868 sta_id = iwl_legacy_sta_id(sta);
869 if (sta_id == IWL_INVALID_STATION) {
870 IWL_ERR(priv, "Start AGG on invalid station\n");
871 return -ENXIO;
872 }
873 if (unlikely(tid >= MAX_TID_COUNT))
874 return -EINVAL;
875
876 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
877 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
878 return -ENXIO;
879 }
880
881 txq_id = iwl4965_txq_ctx_activate_free(priv);
882 if (txq_id == -1) {
883 IWL_ERR(priv, "No free aggregation queue available\n");
884 return -ENXIO;
885 }
886
887 spin_lock_irqsave(&priv->sta_lock, flags);
888 tid_data = &priv->stations[sta_id].tid[tid];
889 *ssn = SEQ_TO_SN(tid_data->seq_number);
890 tid_data->agg.txq_id = txq_id;
891 iwl_legacy_set_swq_id(&priv->txq[txq_id],
892 iwl4965_get_ac_from_tid(tid), txq_id);
893 spin_unlock_irqrestore(&priv->sta_lock, flags);
894
895 ret = iwl4965_txq_agg_enable(priv, txq_id, tx_fifo,
896 sta_id, tid, *ssn);
897 if (ret)
898 return ret;
899
900 spin_lock_irqsave(&priv->sta_lock, flags);
901 tid_data = &priv->stations[sta_id].tid[tid];
902 if (tid_data->tfds_in_queue == 0) {
903 IWL_DEBUG_HT(priv, "HW queue is empty\n");
904 tid_data->agg.state = IWL_AGG_ON;
905 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
906 } else {
907 IWL_DEBUG_HT(priv,
908 "HW queue is NOT empty: %d packets in HW queue\n",
909 tid_data->tfds_in_queue);
910 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
911 }
912 spin_unlock_irqrestore(&priv->sta_lock, flags);
913 return ret;
914 }
915
916 /**
917 * txq_id must be greater than IWL49_FIRST_AMPDU_QUEUE
918 * priv->lock must be held by the caller
919 */
920 static int iwl4965_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
921 u16 ssn_idx, u8 tx_fifo)
922 {
923 if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
924 (IWL49_FIRST_AMPDU_QUEUE +
925 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
926 IWL_WARN(priv,
927 "queue number out of range: %d, must be %d to %d\n",
928 txq_id, IWL49_FIRST_AMPDU_QUEUE,
929 IWL49_FIRST_AMPDU_QUEUE +
930 priv->cfg->base_params->num_of_ampdu_queues - 1);
931 return -EINVAL;
932 }
933
934 iwl4965_tx_queue_stop_scheduler(priv, txq_id);
935
936 iwl_legacy_clear_bits_prph(priv,
937 IWL49_SCD_QUEUECHAIN_SEL, (1 << txq_id));
938
939 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
940 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
941 /* supposes that ssn_idx is valid (!= 0xFFF) */
942 iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
943
944 iwl_legacy_clear_bits_prph(priv,
945 IWL49_SCD_INTERRUPT_MASK, (1 << txq_id));
946 iwl_txq_ctx_deactivate(priv, txq_id);
947 iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
948
949 return 0;
950 }
951
952 int iwl4965_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
953 struct ieee80211_sta *sta, u16 tid)
954 {
955 int tx_fifo_id, txq_id, sta_id, ssn;
956 struct iwl_tid_data *tid_data;
957 int write_ptr, read_ptr;
958 unsigned long flags;
959
960 tx_fifo_id = iwl4965_get_fifo_from_tid(iwl_legacy_rxon_ctx_from_vif(vif), tid);
961 if (unlikely(tx_fifo_id < 0))
962 return tx_fifo_id;
963
964 sta_id = iwl_legacy_sta_id(sta);
965
966 if (sta_id == IWL_INVALID_STATION) {
967 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
968 return -ENXIO;
969 }
970
971 spin_lock_irqsave(&priv->sta_lock, flags);
972
973 tid_data = &priv->stations[sta_id].tid[tid];
974 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
975 txq_id = tid_data->agg.txq_id;
976
977 switch (priv->stations[sta_id].tid[tid].agg.state) {
978 case IWL_EMPTYING_HW_QUEUE_ADDBA:
979 /*
980 * This can happen if the peer stops aggregation
981 * again before we've had a chance to drain the
982 * queue we selected previously, i.e. before the
983 * session was really started completely.
984 */
985 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
986 goto turn_off;
987 case IWL_AGG_ON:
988 break;
989 default:
990 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
991 }
992
993 write_ptr = priv->txq[txq_id].q.write_ptr;
994 read_ptr = priv->txq[txq_id].q.read_ptr;
995
996 /* The queue is not empty */
997 if (write_ptr != read_ptr) {
998 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
999 priv->stations[sta_id].tid[tid].agg.state =
1000 IWL_EMPTYING_HW_QUEUE_DELBA;
1001 spin_unlock_irqrestore(&priv->sta_lock, flags);
1002 return 0;
1003 }
1004
1005 IWL_DEBUG_HT(priv, "HW queue is empty\n");
1006 turn_off:
1007 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
1008
1009 /* do not restore/save irqs */
1010 spin_unlock(&priv->sta_lock);
1011 spin_lock(&priv->lock);
1012
1013 /*
1014 * the only reason this call can fail is queue number out of range,
1015 * which can happen if uCode is reloaded and all the station
1016 * information are lost. if it is outside the range, there is no need
1017 * to deactivate the uCode queue, just return "success" to allow
1018 * mac80211 to clean up it own data.
1019 */
1020 iwl4965_txq_agg_disable(priv, txq_id, ssn, tx_fifo_id);
1021 spin_unlock_irqrestore(&priv->lock, flags);
1022
1023 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1024
1025 return 0;
1026 }
1027
1028 int iwl4965_txq_check_empty(struct iwl_priv *priv,
1029 int sta_id, u8 tid, int txq_id)
1030 {
1031 struct iwl_queue *q = &priv->txq[txq_id].q;
1032 u8 *addr = priv->stations[sta_id].sta.sta.addr;
1033 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
1034 struct iwl_rxon_context *ctx;
1035
1036 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
1037
1038 lockdep_assert_held(&priv->sta_lock);
1039
1040 switch (priv->stations[sta_id].tid[tid].agg.state) {
1041 case IWL_EMPTYING_HW_QUEUE_DELBA:
1042 /* We are reclaiming the last packet of the */
1043 /* aggregated HW queue */
1044 if ((txq_id == tid_data->agg.txq_id) &&
1045 (q->read_ptr == q->write_ptr)) {
1046 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
1047 int tx_fifo = iwl4965_get_fifo_from_tid(ctx, tid);
1048 IWL_DEBUG_HT(priv,
1049 "HW queue empty: continue DELBA flow\n");
1050 iwl4965_txq_agg_disable(priv, txq_id, ssn, tx_fifo);
1051 tid_data->agg.state = IWL_AGG_OFF;
1052 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1053 }
1054 break;
1055 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1056 /* We are reclaiming the last packet of the queue */
1057 if (tid_data->tfds_in_queue == 0) {
1058 IWL_DEBUG_HT(priv,
1059 "HW queue empty: continue ADDBA flow\n");
1060 tid_data->agg.state = IWL_AGG_ON;
1061 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1062 }
1063 break;
1064 }
1065
1066 return 0;
1067 }
1068
1069 static void iwl4965_non_agg_tx_status(struct iwl_priv *priv,
1070 struct iwl_rxon_context *ctx,
1071 const u8 *addr1)
1072 {
1073 struct ieee80211_sta *sta;
1074 struct iwl_station_priv *sta_priv;
1075
1076 rcu_read_lock();
1077 sta = ieee80211_find_sta(ctx->vif, addr1);
1078 if (sta) {
1079 sta_priv = (void *)sta->drv_priv;
1080 /* avoid atomic ops if this isn't a client */
1081 if (sta_priv->client &&
1082 atomic_dec_return(&sta_priv->pending_frames) == 0)
1083 ieee80211_sta_block_awake(priv->hw, sta, false);
1084 }
1085 rcu_read_unlock();
1086 }
1087
1088 static void
1089 iwl4965_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
1090 bool is_agg)
1091 {
1092 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
1093
1094 if (!is_agg)
1095 iwl4965_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
1096
1097 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
1098 }
1099
1100 int iwl4965_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
1101 {
1102 struct iwl_tx_queue *txq = &priv->txq[txq_id];
1103 struct iwl_queue *q = &txq->q;
1104 struct iwl_tx_info *tx_info;
1105 int nfreed = 0;
1106 struct ieee80211_hdr *hdr;
1107
1108 if ((index >= q->n_bd) || (iwl_legacy_queue_used(q, index) == 0)) {
1109 IWL_ERR(priv, "Read index for DMA queue txq id (%d), index %d, "
1110 "is out of range [0-%d] %d %d.\n", txq_id,
1111 index, q->n_bd, q->write_ptr, q->read_ptr);
1112 return 0;
1113 }
1114
1115 for (index = iwl_legacy_queue_inc_wrap(index, q->n_bd);
1116 q->read_ptr != index;
1117 q->read_ptr = iwl_legacy_queue_inc_wrap(q->read_ptr, q->n_bd)) {
1118
1119 tx_info = &txq->txb[txq->q.read_ptr];
1120 iwl4965_tx_status(priv, tx_info,
1121 txq_id >= IWL4965_FIRST_AMPDU_QUEUE);
1122
1123 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
1124 if (hdr && ieee80211_is_data_qos(hdr->frame_control))
1125 nfreed++;
1126 tx_info->skb = NULL;
1127
1128 priv->cfg->ops->lib->txq_free_tfd(priv, txq);
1129 }
1130 return nfreed;
1131 }
1132
1133 /**
1134 * iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack
1135 *
1136 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
1137 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
1138 */
1139 static int iwl4965_tx_status_reply_compressed_ba(struct iwl_priv *priv,
1140 struct iwl_ht_agg *agg,
1141 struct iwl_compressed_ba_resp *ba_resp)
1142
1143 {
1144 int i, sh, ack;
1145 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
1146 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1147 int successes = 0;
1148 struct ieee80211_tx_info *info;
1149 u64 bitmap, sent_bitmap;
1150
1151 if (unlikely(!agg->wait_for_ba)) {
1152 if (unlikely(ba_resp->bitmap))
1153 IWL_ERR(priv, "Received BA when not expected\n");
1154 return -EINVAL;
1155 }
1156
1157 /* Mark that the expected block-ack response arrived */
1158 agg->wait_for_ba = 0;
1159 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx,
1160 ba_resp->seq_ctl);
1161
1162 /* Calculate shift to align block-ack bits with our Tx window bits */
1163 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
1164 if (sh < 0) /* tbw something is wrong with indices */
1165 sh += 0x100;
1166
1167 if (agg->frame_count > (64 - sh)) {
1168 IWL_DEBUG_TX_REPLY(priv, "more frames than bitmap size");
1169 return -1;
1170 }
1171
1172 /* don't use 64-bit values for now */
1173 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
1174
1175 /* check for success or failure according to the
1176 * transmitted bitmap and block-ack bitmap */
1177 sent_bitmap = bitmap & agg->bitmap;
1178
1179 /* For each frame attempted in aggregation,
1180 * update driver's record of tx frame's status. */
1181 i = 0;
1182 while (sent_bitmap) {
1183 ack = sent_bitmap & 1ULL;
1184 successes += ack;
1185 IWL_DEBUG_TX_REPLY(priv, "%s ON i=%d idx=%d raw=%d\n",
1186 ack ? "ACK" : "NACK", i,
1187 (agg->start_idx + i) & 0xff,
1188 agg->start_idx + i);
1189 sent_bitmap >>= 1;
1190 ++i;
1191 }
1192
1193 IWL_DEBUG_TX_REPLY(priv, "Bitmap %llx\n",
1194 (unsigned long long)bitmap);
1195
1196 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
1197 memset(&info->status, 0, sizeof(info->status));
1198 info->flags |= IEEE80211_TX_STAT_ACK;
1199 info->flags |= IEEE80211_TX_STAT_AMPDU;
1200 info->status.ampdu_ack_len = successes;
1201 info->status.ampdu_len = agg->frame_count;
1202 iwl4965_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
1203
1204 return 0;
1205 }
1206
1207 /**
1208 * translate ucode response to mac80211 tx status control values
1209 */
1210 void iwl4965_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
1211 struct ieee80211_tx_info *info)
1212 {
1213 struct ieee80211_tx_rate *r = &info->control.rates[0];
1214
1215 info->antenna_sel_tx =
1216 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1217 if (rate_n_flags & RATE_MCS_HT_MSK)
1218 r->flags |= IEEE80211_TX_RC_MCS;
1219 if (rate_n_flags & RATE_MCS_GF_MSK)
1220 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1221 if (rate_n_flags & RATE_MCS_HT40_MSK)
1222 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1223 if (rate_n_flags & RATE_MCS_DUP_MSK)
1224 r->flags |= IEEE80211_TX_RC_DUP_DATA;
1225 if (rate_n_flags & RATE_MCS_SGI_MSK)
1226 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1227 r->idx = iwl4965_hwrate_to_mac80211_idx(rate_n_flags, info->band);
1228 }
1229
1230 /**
1231 * iwl4965_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1232 *
1233 * Handles block-acknowledge notification from device, which reports success
1234 * of frames sent via aggregation.
1235 */
1236 void iwl4965_rx_reply_compressed_ba(struct iwl_priv *priv,
1237 struct iwl_rx_mem_buffer *rxb)
1238 {
1239 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1240 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1241 struct iwl_tx_queue *txq = NULL;
1242 struct iwl_ht_agg *agg;
1243 int index;
1244 int sta_id;
1245 int tid;
1246 unsigned long flags;
1247
1248 /* "flow" corresponds to Tx queue */
1249 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1250
1251 /* "ssn" is start of block-ack Tx window, corresponds to index
1252 * (in Tx queue's circular buffer) of first TFD/frame in window */
1253 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1254
1255 if (scd_flow >= priv->hw_params.max_txq_num) {
1256 IWL_ERR(priv,
1257 "BUG_ON scd_flow is bigger than number of queues\n");
1258 return;
1259 }
1260
1261 txq = &priv->txq[scd_flow];
1262 sta_id = ba_resp->sta_id;
1263 tid = ba_resp->tid;
1264 agg = &priv->stations[sta_id].tid[tid].agg;
1265 if (unlikely(agg->txq_id != scd_flow)) {
1266 /*
1267 * FIXME: this is a uCode bug which need to be addressed,
1268 * log the information and return for now!
1269 * since it is possible happen very often and in order
1270 * not to fill the syslog, don't enable the logging by default
1271 */
1272 IWL_DEBUG_TX_REPLY(priv,
1273 "BA scd_flow %d does not match txq_id %d\n",
1274 scd_flow, agg->txq_id);
1275 return;
1276 }
1277
1278 /* Find index just before block-ack window */
1279 index = iwl_legacy_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
1280
1281 spin_lock_irqsave(&priv->sta_lock, flags);
1282
1283 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1284 "sta_id = %d\n",
1285 agg->wait_for_ba,
1286 (u8 *) &ba_resp->sta_addr_lo32,
1287 ba_resp->sta_id);
1288 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx,"
1289 "scd_flow = "
1290 "%d, scd_ssn = %d\n",
1291 ba_resp->tid,
1292 ba_resp->seq_ctl,
1293 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1294 ba_resp->scd_flow,
1295 ba_resp->scd_ssn);
1296 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
1297 agg->start_idx,
1298 (unsigned long long)agg->bitmap);
1299
1300 /* Update driver's record of ACK vs. not for each frame in window */
1301 iwl4965_tx_status_reply_compressed_ba(priv, agg, ba_resp);
1302
1303 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1304 * block-ack window (we assume that they've been successfully
1305 * transmitted ... if not, it's too late anyway). */
1306 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
1307 /* calculate mac80211 ampdu sw queue to wake */
1308 int freed = iwl4965_tx_queue_reclaim(priv, scd_flow, index);
1309 iwl4965_free_tfds_in_queue(priv, sta_id, tid, freed);
1310
1311 if ((iwl_legacy_queue_space(&txq->q) > txq->q.low_mark) &&
1312 priv->mac80211_registered &&
1313 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
1314 iwl_legacy_wake_queue(priv, txq);
1315
1316 iwl4965_txq_check_empty(priv, sta_id, tid, scd_flow);
1317 }
1318
1319 spin_unlock_irqrestore(&priv->sta_lock, flags);
1320 }
1321
1322 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
1323 const char *iwl4965_get_tx_fail_reason(u32 status)
1324 {
1325 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1326 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1327
1328 switch (status & TX_STATUS_MSK) {
1329 case TX_STATUS_SUCCESS:
1330 return "SUCCESS";
1331 TX_STATUS_POSTPONE(DELAY);
1332 TX_STATUS_POSTPONE(FEW_BYTES);
1333 TX_STATUS_POSTPONE(QUIET_PERIOD);
1334 TX_STATUS_POSTPONE(CALC_TTAK);
1335 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1336 TX_STATUS_FAIL(SHORT_LIMIT);
1337 TX_STATUS_FAIL(LONG_LIMIT);
1338 TX_STATUS_FAIL(FIFO_UNDERRUN);
1339 TX_STATUS_FAIL(DRAIN_FLOW);
1340 TX_STATUS_FAIL(RFKILL_FLUSH);
1341 TX_STATUS_FAIL(LIFE_EXPIRE);
1342 TX_STATUS_FAIL(DEST_PS);
1343 TX_STATUS_FAIL(HOST_ABORTED);
1344 TX_STATUS_FAIL(BT_RETRY);
1345 TX_STATUS_FAIL(STA_INVALID);
1346 TX_STATUS_FAIL(FRAG_DROPPED);
1347 TX_STATUS_FAIL(TID_DISABLE);
1348 TX_STATUS_FAIL(FIFO_FLUSHED);
1349 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
1350 TX_STATUS_FAIL(PASSIVE_NO_RX);
1351 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
1352 }
1353
1354 return "UNKNOWN";
1355
1356 #undef TX_STATUS_FAIL
1357 #undef TX_STATUS_POSTPONE
1358 }
1359 #endif /* CONFIG_IWLWIFI_LEGACY_DEBUG */
Linux kernel - Deliverables
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