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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / net / wireless / iwlegacy / iwl-4965-tx.c
blob7f12e3638bae4b403916babbc52971a32a3247b8
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 = iwlegacy_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_p2k(keyconf, skb_frag, tx_cmd->key);
244 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
245 break;
246
247 case WLAN_CIPHER_SUITE_WEP104:
248 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
249 /* fall through */
250 case WLAN_CIPHER_SUITE_WEP40:
251 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
252 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
253
254 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
255
256 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
257 "with key %d\n", keyconf->keyidx);
258 break;
259
260 default:
261 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
262 break;
263 }
264 }
265
266 /*
267 * start REPLY_TX command process
268 */
269 int iwl4965_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
270 {
271 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
272 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
273 struct ieee80211_sta *sta = info->control.sta;
274 struct iwl_station_priv *sta_priv = NULL;
275 struct iwl_tx_queue *txq;
276 struct iwl_queue *q;
277 struct iwl_device_cmd *out_cmd;
278 struct iwl_cmd_meta *out_meta;
279 struct iwl_tx_cmd *tx_cmd;
280 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
281 int txq_id;
282 dma_addr_t phys_addr;
283 dma_addr_t txcmd_phys;
284 dma_addr_t scratch_phys;
285 u16 len, firstlen, secondlen;
286 u16 seq_number = 0;
287 __le16 fc;
288 u8 hdr_len;
289 u8 sta_id;
290 u8 wait_write_ptr = 0;
291 u8 tid = 0;
292 u8 *qc = NULL;
293 unsigned long flags;
294 bool is_agg = false;
295
296 if (info->control.vif)
297 ctx = iwl_legacy_rxon_ctx_from_vif(info->control.vif);
298
299 spin_lock_irqsave(&priv->lock, flags);
300 if (iwl_legacy_is_rfkill(priv)) {
301 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
302 goto drop_unlock;
303 }
304
305 fc = hdr->frame_control;
306
307 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
308 if (ieee80211_is_auth(fc))
309 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
310 else if (ieee80211_is_assoc_req(fc))
311 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
312 else if (ieee80211_is_reassoc_req(fc))
313 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
314 #endif
315
316 hdr_len = ieee80211_hdrlen(fc);
317
318 /* For management frames use broadcast id to do not break aggregation */
319 if (!ieee80211_is_data(fc))
320 sta_id = ctx->bcast_sta_id;
321 else {
322 /* Find index into station table for destination station */
323 sta_id = iwl_legacy_sta_id_or_broadcast(priv, ctx, info->control.sta);
324
325 if (sta_id == IWL_INVALID_STATION) {
326 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
327 hdr->addr1);
328 goto drop_unlock;
329 }
330 }
331
332 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
333
334 if (sta)
335 sta_priv = (void *)sta->drv_priv;
336
337 if (sta_priv && sta_priv->asleep &&
338 (info->flags & IEEE80211_TX_CTL_POLL_RESPONSE)) {
339 /*
340 * This sends an asynchronous command to the device,
341 * but we can rely on it being processed before the
342 * next frame is processed -- and the next frame to
343 * this station is the one that will consume this
344 * counter.
345 * For now set the counter to just 1 since we do not
346 * support uAPSD yet.
347 */
348 iwl4965_sta_modify_sleep_tx_count(priv, sta_id, 1);
349 }
350
351 /*
352 * Send this frame after DTIM -- there's a special queue
353 * reserved for this for contexts that support AP mode.
354 */
355 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
356 txq_id = ctx->mcast_queue;
357 /*
358 * The microcode will clear the more data
359 * bit in the last frame it transmits.
360 */
361 hdr->frame_control |=
362 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
363 } else
364 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
365
366 /* irqs already disabled/saved above when locking priv->lock */
367 spin_lock(&priv->sta_lock);
368
369 if (ieee80211_is_data_qos(fc)) {
370 qc = ieee80211_get_qos_ctl(hdr);
371 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
372 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT)) {
373 spin_unlock(&priv->sta_lock);
374 goto drop_unlock;
375 }
376 seq_number = priv->stations[sta_id].tid[tid].seq_number;
377 seq_number &= IEEE80211_SCTL_SEQ;
378 hdr->seq_ctrl = hdr->seq_ctrl &
379 cpu_to_le16(IEEE80211_SCTL_FRAG);
380 hdr->seq_ctrl |= cpu_to_le16(seq_number);
381 seq_number += 0x10;
382 /* aggregation is on for this <sta,tid> */
383 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
384 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
385 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
386 is_agg = true;
387 }
388 }
389
390 txq = &priv->txq[txq_id];
391 q = &txq->q;
392
393 if (unlikely(iwl_legacy_queue_space(q) < q->high_mark)) {
394 spin_unlock(&priv->sta_lock);
395 goto drop_unlock;
396 }
397
398 if (ieee80211_is_data_qos(fc)) {
399 priv->stations[sta_id].tid[tid].tfds_in_queue++;
400 if (!ieee80211_has_morefrags(fc))
401 priv->stations[sta_id].tid[tid].seq_number = seq_number;
402 }
403
404 spin_unlock(&priv->sta_lock);
405
406 /* Set up driver data for this TFD */
407 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
408 txq->txb[q->write_ptr].skb = skb;
409 txq->txb[q->write_ptr].ctx = ctx;
410
411 /* Set up first empty entry in queue's array of Tx/cmd buffers */
412 out_cmd = txq->cmd[q->write_ptr];
413 out_meta = &txq->meta[q->write_ptr];
414 tx_cmd = &out_cmd->cmd.tx;
415 memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
416 memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd));
417
418 /*
419 * Set up the Tx-command (not MAC!) header.
420 * Store the chosen Tx queue and TFD index within the sequence field;
421 * after Tx, uCode's Tx response will return this value so driver can
422 * locate the frame within the tx queue and do post-tx processing.
423 */
424 out_cmd->hdr.cmd = REPLY_TX;
425 out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
426 INDEX_TO_SEQ(q->write_ptr)));
427
428 /* Copy MAC header from skb into command buffer */
429 memcpy(tx_cmd->hdr, hdr, hdr_len);
430
431
432 /* Total # bytes to be transmitted */
433 len = (u16)skb->len;
434 tx_cmd->len = cpu_to_le16(len);
435
436 if (info->control.hw_key)
437 iwl4965_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
438
439 /* TODO need this for burst mode later on */
440 iwl4965_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
441 iwl_legacy_dbg_log_tx_data_frame(priv, len, hdr);
442
443 iwl4965_tx_cmd_build_rate(priv, tx_cmd, info, fc);
444
445 iwl_legacy_update_stats(priv, true, fc, len);
446 /*
447 * Use the first empty entry in this queue's command buffer array
448 * to contain the Tx command and MAC header concatenated together
449 * (payload data will be in another buffer).
450 * Size of this varies, due to varying MAC header length.
451 * If end is not dword aligned, we'll have 2 extra bytes at the end
452 * of the MAC header (device reads on dword boundaries).
453 * We'll tell device about this padding later.
454 */
455 len = sizeof(struct iwl_tx_cmd) +
456 sizeof(struct iwl_cmd_header) + hdr_len;
457 firstlen = (len + 3) & ~3;
458
459 /* Tell NIC about any 2-byte padding after MAC header */
460 if (firstlen != len)
461 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
462
463 /* Physical address of this Tx command's header (not MAC header!),
464 * within command buffer array. */
465 txcmd_phys = pci_map_single(priv->pci_dev,
466 &out_cmd->hdr, firstlen,
467 PCI_DMA_BIDIRECTIONAL);
468 dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
469 dma_unmap_len_set(out_meta, len, firstlen);
470 /* Add buffer containing Tx command and MAC(!) header to TFD's
471 * first entry */
472 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
473 txcmd_phys, firstlen, 1, 0);
474
475 if (!ieee80211_has_morefrags(hdr->frame_control)) {
476 txq->need_update = 1;
477 } else {
478 wait_write_ptr = 1;
479 txq->need_update = 0;
480 }
481
482 /* Set up TFD's 2nd entry to point directly to remainder of skb,
483 * if any (802.11 null frames have no payload). */
484 secondlen = skb->len - hdr_len;
485 if (secondlen > 0) {
486 phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
487 secondlen, PCI_DMA_TODEVICE);
488 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
489 phys_addr, secondlen,
490 0, 0);
491 }
492
493 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
494 offsetof(struct iwl_tx_cmd, scratch);
495
496 /* take back ownership of DMA buffer to enable update */
497 pci_dma_sync_single_for_cpu(priv->pci_dev, txcmd_phys,
498 firstlen, PCI_DMA_BIDIRECTIONAL);
499 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
500 tx_cmd->dram_msb_ptr = iwl_legacy_get_dma_hi_addr(scratch_phys);
501
502 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
503 le16_to_cpu(out_cmd->hdr.sequence));
504 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
505 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
506 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
507
508 /* Set up entry for this TFD in Tx byte-count array */
509 if (info->flags & IEEE80211_TX_CTL_AMPDU)
510 priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq,
511 le16_to_cpu(tx_cmd->len));
512
513 pci_dma_sync_single_for_device(priv->pci_dev, txcmd_phys,
514 firstlen, PCI_DMA_BIDIRECTIONAL);
515
516 trace_iwlwifi_legacy_dev_tx(priv,
517 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
518 sizeof(struct iwl_tfd),
519 &out_cmd->hdr, firstlen,
520 skb->data + hdr_len, secondlen);
521
522 /* Tell device the write index *just past* this latest filled TFD */
523 q->write_ptr = iwl_legacy_queue_inc_wrap(q->write_ptr, q->n_bd);
524 iwl_legacy_txq_update_write_ptr(priv, txq);
525 spin_unlock_irqrestore(&priv->lock, flags);
526
527 /*
528 * At this point the frame is "transmitted" successfully
529 * and we will get a TX status notification eventually,
530 * regardless of the value of ret. "ret" only indicates
531 * whether or not we should update the write pointer.
532 */
533
534 /*
535 * Avoid atomic ops if it isn't an associated client.
536 * Also, if this is a packet for aggregation, don't
537 * increase the counter because the ucode will stop
538 * aggregation queues when their respective station
539 * goes to sleep.
540 */
541 if (sta_priv && sta_priv->client && !is_agg)
542 atomic_inc(&sta_priv->pending_frames);
543
544 if ((iwl_legacy_queue_space(q) < q->high_mark) &&
545 priv->mac80211_registered) {
546 if (wait_write_ptr) {
547 spin_lock_irqsave(&priv->lock, flags);
548 txq->need_update = 1;
549 iwl_legacy_txq_update_write_ptr(priv, txq);
550 spin_unlock_irqrestore(&priv->lock, flags);
551 } else {
552 iwl_legacy_stop_queue(priv, txq);
553 }
554 }
555
556 return 0;
557
558 drop_unlock:
559 spin_unlock_irqrestore(&priv->lock, flags);
560 return -1;
561 }
562
563 static inline int iwl4965_alloc_dma_ptr(struct iwl_priv *priv,
564 struct iwl_dma_ptr *ptr, size_t size)
565 {
566 ptr->addr = dma_alloc_coherent(&priv->pci_dev->dev, size, &ptr->dma,
567 GFP_KERNEL);
568 if (!ptr->addr)
569 return -ENOMEM;
570 ptr->size = size;
571 return 0;
572 }
573
574 static inline void iwl4965_free_dma_ptr(struct iwl_priv *priv,
575 struct iwl_dma_ptr *ptr)
576 {
577 if (unlikely(!ptr->addr))
578 return;
579
580 dma_free_coherent(&priv->pci_dev->dev, ptr->size, ptr->addr, ptr->dma);
581 memset(ptr, 0, sizeof(*ptr));
582 }
583
584 /**
585 * iwl4965_hw_txq_ctx_free - Free TXQ Context
586 *
587 * Destroy all TX DMA queues and structures
588 */
589 void iwl4965_hw_txq_ctx_free(struct iwl_priv *priv)
590 {
591 int txq_id;
592
593 /* Tx queues */
594 if (priv->txq) {
595 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
596 if (txq_id == priv->cmd_queue)
597 iwl_legacy_cmd_queue_free(priv);
598 else
599 iwl_legacy_tx_queue_free(priv, txq_id);
600 }
601 iwl4965_free_dma_ptr(priv, &priv->kw);
602
603 iwl4965_free_dma_ptr(priv, &priv->scd_bc_tbls);
604
605 /* free tx queue structure */
606 iwl_legacy_txq_mem(priv);
607 }
608
609 /**
610 * iwl4965_txq_ctx_alloc - allocate TX queue context
611 * Allocate all Tx DMA structures and initialize them
612 *
613 * @param priv
614 * @return error code
615 */
616 int iwl4965_txq_ctx_alloc(struct iwl_priv *priv)
617 {
618 int ret;
619 int txq_id, slots_num;
620 unsigned long flags;
621
622 /* Free all tx/cmd queues and keep-warm buffer */
623 iwl4965_hw_txq_ctx_free(priv);
624
625 ret = iwl4965_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
626 priv->hw_params.scd_bc_tbls_size);
627 if (ret) {
628 IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
629 goto error_bc_tbls;
630 }
631 /* Alloc keep-warm buffer */
632 ret = iwl4965_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
633 if (ret) {
634 IWL_ERR(priv, "Keep Warm allocation failed\n");
635 goto error_kw;
636 }
637
638 /* allocate tx queue structure */
639 ret = iwl_legacy_alloc_txq_mem(priv);
640 if (ret)
641 goto error;
642
643 spin_lock_irqsave(&priv->lock, flags);
644
645 /* Turn off all Tx DMA fifos */
646 iwl4965_txq_set_sched(priv, 0);
647
648 /* Tell NIC where to find the "keep warm" buffer */
649 iwl_legacy_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
650
651 spin_unlock_irqrestore(&priv->lock, flags);
652
653 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
654 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
655 slots_num = (txq_id == priv->cmd_queue) ?
656 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
657 ret = iwl_legacy_tx_queue_init(priv,
658 &priv->txq[txq_id], slots_num,
659 txq_id);
660 if (ret) {
661 IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
662 goto error;
663 }
664 }
665
666 return ret;
667
668 error:
669 iwl4965_hw_txq_ctx_free(priv);
670 iwl4965_free_dma_ptr(priv, &priv->kw);
671 error_kw:
672 iwl4965_free_dma_ptr(priv, &priv->scd_bc_tbls);
673 error_bc_tbls:
674 return ret;
675 }
676
677 void iwl4965_txq_ctx_reset(struct iwl_priv *priv)
678 {
679 int txq_id, slots_num;
680 unsigned long flags;
681
682 spin_lock_irqsave(&priv->lock, flags);
683
684 /* Turn off all Tx DMA fifos */
685 iwl4965_txq_set_sched(priv, 0);
686
687 /* Tell NIC where to find the "keep warm" buffer */
688 iwl_legacy_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
689
690 spin_unlock_irqrestore(&priv->lock, flags);
691
692 /* Alloc and init all Tx queues, including the command queue (#4) */
693 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
694 slots_num = txq_id == priv->cmd_queue ?
695 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
696 iwl_legacy_tx_queue_reset(priv, &priv->txq[txq_id],
697 slots_num, txq_id);
698 }
699 }
700
701 /**
702 * iwl4965_txq_ctx_stop - Stop all Tx DMA channels
703 */
704 void iwl4965_txq_ctx_stop(struct iwl_priv *priv)
705 {
706 int ch, txq_id;
707 unsigned long flags;
708
709 /* Turn off all Tx DMA fifos */
710 spin_lock_irqsave(&priv->lock, flags);
711
712 iwl4965_txq_set_sched(priv, 0);
713
714 /* Stop each Tx DMA channel, and wait for it to be idle */
715 for (ch = 0; ch < priv->hw_params.dma_chnl_num; ch++) {
716 iwl_legacy_write_direct32(priv,
717 FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
718 if (iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
719 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
720 1000))
721 IWL_ERR(priv, "Failing on timeout while stopping"
722 " DMA channel %d [0x%08x]", ch,
723 iwl_legacy_read_direct32(priv,
724 FH_TSSR_TX_STATUS_REG));
725 }
726 spin_unlock_irqrestore(&priv->lock, flags);
727
728 if (!priv->txq)
729 return;
730
731 /* Unmap DMA from host system and free skb's */
732 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
733 if (txq_id == priv->cmd_queue)
734 iwl_legacy_cmd_queue_unmap(priv);
735 else
736 iwl_legacy_tx_queue_unmap(priv, txq_id);
737 }
738
739 /*
740 * Find first available (lowest unused) Tx Queue, mark it "active".
741 * Called only when finding queue for aggregation.
742 * Should never return anything < 7, because they should already
743 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
744 */
745 static int iwl4965_txq_ctx_activate_free(struct iwl_priv *priv)
746 {
747 int txq_id;
748
749 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
750 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
751 return txq_id;
752 return -1;
753 }
754
755 /**
756 * iwl4965_tx_queue_stop_scheduler - Stop queue, but keep configuration
757 */
758 static void iwl4965_tx_queue_stop_scheduler(struct iwl_priv *priv,
759 u16 txq_id)
760 {
761 /* Simply stop the queue, but don't change any configuration;
762 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
763 iwl_legacy_write_prph(priv,
764 IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
765 (0 << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
766 (1 << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
767 }
768
769 /**
770 * iwl4965_tx_queue_set_q2ratid - Map unique receiver/tid combination to a queue
771 */
772 static int iwl4965_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
773 u16 txq_id)
774 {
775 u32 tbl_dw_addr;
776 u32 tbl_dw;
777 u16 scd_q2ratid;
778
779 scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;
780
781 tbl_dw_addr = priv->scd_base_addr +
782 IWL49_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
783
784 tbl_dw = iwl_legacy_read_targ_mem(priv, tbl_dw_addr);
785
786 if (txq_id & 0x1)
787 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
788 else
789 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
790
791 iwl_legacy_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
792
793 return 0;
794 }
795
796 /**
797 * iwl4965_tx_queue_agg_enable - Set up & enable aggregation for selected queue
798 *
799 * NOTE: txq_id must be greater than IWL49_FIRST_AMPDU_QUEUE,
800 * i.e. it must be one of the higher queues used for aggregation
801 */
802 static int iwl4965_txq_agg_enable(struct iwl_priv *priv, int txq_id,
803 int tx_fifo, int sta_id, int tid, u16 ssn_idx)
804 {
805 unsigned long flags;
806 u16 ra_tid;
807 int ret;
808
809 if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
810 (IWL49_FIRST_AMPDU_QUEUE +
811 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
812 IWL_WARN(priv,
813 "queue number out of range: %d, must be %d to %d\n",
814 txq_id, IWL49_FIRST_AMPDU_QUEUE,
815 IWL49_FIRST_AMPDU_QUEUE +
816 priv->cfg->base_params->num_of_ampdu_queues - 1);
817 return -EINVAL;
818 }
819
820 ra_tid = BUILD_RAxTID(sta_id, tid);
821
822 /* Modify device's station table to Tx this TID */
823 ret = iwl4965_sta_tx_modify_enable_tid(priv, sta_id, tid);
824 if (ret)
825 return ret;
826
827 spin_lock_irqsave(&priv->lock, flags);
828
829 /* Stop this Tx queue before configuring it */
830 iwl4965_tx_queue_stop_scheduler(priv, txq_id);
831
832 /* Map receiver-address / traffic-ID to this queue */
833 iwl4965_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
834
835 /* Set this queue as a chain-building queue */
836 iwl_legacy_set_bits_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, (1 << txq_id));
837
838 /* Place first TFD at index corresponding to start sequence number.
839 * Assumes that ssn_idx is valid (!= 0xFFF) */
840 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
841 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
842 iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
843
844 /* Set up Tx window size and frame limit for this queue */
845 iwl_legacy_write_targ_mem(priv,
846 priv->scd_base_addr + IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id),
847 (SCD_WIN_SIZE << IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
848 IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
849
850 iwl_legacy_write_targ_mem(priv, priv->scd_base_addr +
851 IWL49_SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
852 (SCD_FRAME_LIMIT << IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS)
853 & IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);
854
855 iwl_legacy_set_bits_prph(priv, IWL49_SCD_INTERRUPT_MASK, (1 << txq_id));
856
857 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
858 iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
859
860 spin_unlock_irqrestore(&priv->lock, flags);
861
862 return 0;
863 }
864
865
866 int iwl4965_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
867 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
868 {
869 int sta_id;
870 int tx_fifo;
871 int txq_id;
872 int ret;
873 unsigned long flags;
874 struct iwl_tid_data *tid_data;
875
876 tx_fifo = iwl4965_get_fifo_from_tid(iwl_legacy_rxon_ctx_from_vif(vif), tid);
877 if (unlikely(tx_fifo < 0))
878 return tx_fifo;
879
880 IWL_WARN(priv, "%s on ra = %pM tid = %d\n",
881 __func__, sta->addr, tid);
882
883 sta_id = iwl_legacy_sta_id(sta);
884 if (sta_id == IWL_INVALID_STATION) {
885 IWL_ERR(priv, "Start AGG on invalid station\n");
886 return -ENXIO;
887 }
888 if (unlikely(tid >= MAX_TID_COUNT))
889 return -EINVAL;
890
891 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
892 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
893 return -ENXIO;
894 }
895
896 txq_id = iwl4965_txq_ctx_activate_free(priv);
897 if (txq_id == -1) {
898 IWL_ERR(priv, "No free aggregation queue available\n");
899 return -ENXIO;
900 }
901
902 spin_lock_irqsave(&priv->sta_lock, flags);
903 tid_data = &priv->stations[sta_id].tid[tid];
904 *ssn = SEQ_TO_SN(tid_data->seq_number);
905 tid_data->agg.txq_id = txq_id;
906 iwl_legacy_set_swq_id(&priv->txq[txq_id],
907 iwl4965_get_ac_from_tid(tid), txq_id);
908 spin_unlock_irqrestore(&priv->sta_lock, flags);
909
910 ret = iwl4965_txq_agg_enable(priv, txq_id, tx_fifo,
911 sta_id, tid, *ssn);
912 if (ret)
913 return ret;
914
915 spin_lock_irqsave(&priv->sta_lock, flags);
916 tid_data = &priv->stations[sta_id].tid[tid];
917 if (tid_data->tfds_in_queue == 0) {
918 IWL_DEBUG_HT(priv, "HW queue is empty\n");
919 tid_data->agg.state = IWL_AGG_ON;
920 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
921 } else {
922 IWL_DEBUG_HT(priv,
923 "HW queue is NOT empty: %d packets in HW queue\n",
924 tid_data->tfds_in_queue);
925 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
926 }
927 spin_unlock_irqrestore(&priv->sta_lock, flags);
928 return ret;
929 }
930
931 /**
932 * txq_id must be greater than IWL49_FIRST_AMPDU_QUEUE
933 * priv->lock must be held by the caller
934 */
935 static int iwl4965_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
936 u16 ssn_idx, u8 tx_fifo)
937 {
938 if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
939 (IWL49_FIRST_AMPDU_QUEUE +
940 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
941 IWL_WARN(priv,
942 "queue number out of range: %d, must be %d to %d\n",
943 txq_id, IWL49_FIRST_AMPDU_QUEUE,
944 IWL49_FIRST_AMPDU_QUEUE +
945 priv->cfg->base_params->num_of_ampdu_queues - 1);
946 return -EINVAL;
947 }
948
949 iwl4965_tx_queue_stop_scheduler(priv, txq_id);
950
951 iwl_legacy_clear_bits_prph(priv,
952 IWL49_SCD_QUEUECHAIN_SEL, (1 << txq_id));
953
954 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
955 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
956 /* supposes that ssn_idx is valid (!= 0xFFF) */
957 iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
958
959 iwl_legacy_clear_bits_prph(priv,
960 IWL49_SCD_INTERRUPT_MASK, (1 << txq_id));
961 iwl_txq_ctx_deactivate(priv, txq_id);
962 iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
963
964 return 0;
965 }
966
967 int iwl4965_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
968 struct ieee80211_sta *sta, u16 tid)
969 {
970 int tx_fifo_id, txq_id, sta_id, ssn;
971 struct iwl_tid_data *tid_data;
972 int write_ptr, read_ptr;
973 unsigned long flags;
974
975 tx_fifo_id = iwl4965_get_fifo_from_tid(iwl_legacy_rxon_ctx_from_vif(vif), tid);
976 if (unlikely(tx_fifo_id < 0))
977 return tx_fifo_id;
978
979 sta_id = iwl_legacy_sta_id(sta);
980
981 if (sta_id == IWL_INVALID_STATION) {
982 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
983 return -ENXIO;
984 }
985
986 spin_lock_irqsave(&priv->sta_lock, flags);
987
988 tid_data = &priv->stations[sta_id].tid[tid];
989 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
990 txq_id = tid_data->agg.txq_id;
991
992 switch (priv->stations[sta_id].tid[tid].agg.state) {
993 case IWL_EMPTYING_HW_QUEUE_ADDBA:
994 /*
995 * This can happen if the peer stops aggregation
996 * again before we've had a chance to drain the
997 * queue we selected previously, i.e. before the
998 * session was really started completely.
999 */
1000 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
1001 goto turn_off;
1002 case IWL_AGG_ON:
1003 break;
1004 default:
1005 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
1006 }
1007
1008 write_ptr = priv->txq[txq_id].q.write_ptr;
1009 read_ptr = priv->txq[txq_id].q.read_ptr;
1010
1011 /* The queue is not empty */
1012 if (write_ptr != read_ptr) {
1013 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
1014 priv->stations[sta_id].tid[tid].agg.state =
1015 IWL_EMPTYING_HW_QUEUE_DELBA;
1016 spin_unlock_irqrestore(&priv->sta_lock, flags);
1017 return 0;
1018 }
1019
1020 IWL_DEBUG_HT(priv, "HW queue is empty\n");
1021 turn_off:
1022 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
1023
1024 /* do not restore/save irqs */
1025 spin_unlock(&priv->sta_lock);
1026 spin_lock(&priv->lock);
1027
1028 /*
1029 * the only reason this call can fail is queue number out of range,
1030 * which can happen if uCode is reloaded and all the station
1031 * information are lost. if it is outside the range, there is no need
1032 * to deactivate the uCode queue, just return "success" to allow
1033 * mac80211 to clean up it own data.
1034 */
1035 iwl4965_txq_agg_disable(priv, txq_id, ssn, tx_fifo_id);
1036 spin_unlock_irqrestore(&priv->lock, flags);
1037
1038 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1039
1040 return 0;
1041 }
1042
1043 int iwl4965_txq_check_empty(struct iwl_priv *priv,
1044 int sta_id, u8 tid, int txq_id)
1045 {
1046 struct iwl_queue *q = &priv->txq[txq_id].q;
1047 u8 *addr = priv->stations[sta_id].sta.sta.addr;
1048 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
1049 struct iwl_rxon_context *ctx;
1050
1051 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
1052
1053 lockdep_assert_held(&priv->sta_lock);
1054
1055 switch (priv->stations[sta_id].tid[tid].agg.state) {
1056 case IWL_EMPTYING_HW_QUEUE_DELBA:
1057 /* We are reclaiming the last packet of the */
1058 /* aggregated HW queue */
1059 if ((txq_id == tid_data->agg.txq_id) &&
1060 (q->read_ptr == q->write_ptr)) {
1061 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
1062 int tx_fifo = iwl4965_get_fifo_from_tid(ctx, tid);
1063 IWL_DEBUG_HT(priv,
1064 "HW queue empty: continue DELBA flow\n");
1065 iwl4965_txq_agg_disable(priv, txq_id, ssn, tx_fifo);
1066 tid_data->agg.state = IWL_AGG_OFF;
1067 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1068 }
1069 break;
1070 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1071 /* We are reclaiming the last packet of the queue */
1072 if (tid_data->tfds_in_queue == 0) {
1073 IWL_DEBUG_HT(priv,
1074 "HW queue empty: continue ADDBA flow\n");
1075 tid_data->agg.state = IWL_AGG_ON;
1076 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
1077 }
1078 break;
1079 }
1080
1081 return 0;
1082 }
1083
1084 static void iwl4965_non_agg_tx_status(struct iwl_priv *priv,
1085 struct iwl_rxon_context *ctx,
1086 const u8 *addr1)
1087 {
1088 struct ieee80211_sta *sta;
1089 struct iwl_station_priv *sta_priv;
1090
1091 rcu_read_lock();
1092 sta = ieee80211_find_sta(ctx->vif, addr1);
1093 if (sta) {
1094 sta_priv = (void *)sta->drv_priv;
1095 /* avoid atomic ops if this isn't a client */
1096 if (sta_priv->client &&
1097 atomic_dec_return(&sta_priv->pending_frames) == 0)
1098 ieee80211_sta_block_awake(priv->hw, sta, false);
1099 }
1100 rcu_read_unlock();
1101 }
1102
1103 static void
1104 iwl4965_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
1105 bool is_agg)
1106 {
1107 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
1108
1109 if (!is_agg)
1110 iwl4965_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
1111
1112 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
1113 }
1114
1115 int iwl4965_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
1116 {
1117 struct iwl_tx_queue *txq = &priv->txq[txq_id];
1118 struct iwl_queue *q = &txq->q;
1119 struct iwl_tx_info *tx_info;
1120 int nfreed = 0;
1121 struct ieee80211_hdr *hdr;
1122
1123 if ((index >= q->n_bd) || (iwl_legacy_queue_used(q, index) == 0)) {
1124 IWL_ERR(priv, "Read index for DMA queue txq id (%d), index %d, "
1125 "is out of range [0-%d] %d %d.\n", txq_id,
1126 index, q->n_bd, q->write_ptr, q->read_ptr);
1127 return 0;
1128 }
1129
1130 for (index = iwl_legacy_queue_inc_wrap(index, q->n_bd);
1131 q->read_ptr != index;
1132 q->read_ptr = iwl_legacy_queue_inc_wrap(q->read_ptr, q->n_bd)) {
1133
1134 tx_info = &txq->txb[txq->q.read_ptr];
1135
1136 if (WARN_ON_ONCE(tx_info->skb == NULL))
1137 continue;
1138
1139 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
1140 if (ieee80211_is_data_qos(hdr->frame_control))
1141 nfreed++;
1142
1143 iwl4965_tx_status(priv, tx_info,
1144 txq_id >= IWL4965_FIRST_AMPDU_QUEUE);
1145 tx_info->skb = NULL;
1146
1147 priv->cfg->ops->lib->txq_free_tfd(priv, txq);
1148 }
1149 return nfreed;
1150 }
1151
1152 /**
1153 * iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack
1154 *
1155 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
1156 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
1157 */
1158 static int iwl4965_tx_status_reply_compressed_ba(struct iwl_priv *priv,
1159 struct iwl_ht_agg *agg,
1160 struct iwl_compressed_ba_resp *ba_resp)
1161
1162 {
1163 int i, sh, ack;
1164 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
1165 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1166 int successes = 0;
1167 struct ieee80211_tx_info *info;
1168 u64 bitmap, sent_bitmap;
1169
1170 if (unlikely(!agg->wait_for_ba)) {
1171 if (unlikely(ba_resp->bitmap))
1172 IWL_ERR(priv, "Received BA when not expected\n");
1173 return -EINVAL;
1174 }
1175
1176 /* Mark that the expected block-ack response arrived */
1177 agg->wait_for_ba = 0;
1178 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx,
1179 ba_resp->seq_ctl);
1180
1181 /* Calculate shift to align block-ack bits with our Tx window bits */
1182 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
1183 if (sh < 0) /* tbw something is wrong with indices */
1184 sh += 0x100;
1185
1186 if (agg->frame_count > (64 - sh)) {
1187 IWL_DEBUG_TX_REPLY(priv, "more frames than bitmap size");
1188 return -1;
1189 }
1190
1191 /* don't use 64-bit values for now */
1192 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
1193
1194 /* check for success or failure according to the
1195 * transmitted bitmap and block-ack bitmap */
1196 sent_bitmap = bitmap & agg->bitmap;
1197
1198 /* For each frame attempted in aggregation,
1199 * update driver's record of tx frame's status. */
1200 i = 0;
1201 while (sent_bitmap) {
1202 ack = sent_bitmap & 1ULL;
1203 successes += ack;
1204 IWL_DEBUG_TX_REPLY(priv, "%s ON i=%d idx=%d raw=%d\n",
1205 ack ? "ACK" : "NACK", i,
1206 (agg->start_idx + i) & 0xff,
1207 agg->start_idx + i);
1208 sent_bitmap >>= 1;
1209 ++i;
1210 }
1211
1212 IWL_DEBUG_TX_REPLY(priv, "Bitmap %llx\n",
1213 (unsigned long long)bitmap);
1214
1215 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
1216 memset(&info->status, 0, sizeof(info->status));
1217 info->flags |= IEEE80211_TX_STAT_ACK;
1218 info->flags |= IEEE80211_TX_STAT_AMPDU;
1219 info->status.ampdu_ack_len = successes;
1220 info->status.ampdu_len = agg->frame_count;
1221 iwl4965_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
1222
1223 return 0;
1224 }
1225
1226 /**
1227 * translate ucode response to mac80211 tx status control values
1228 */
1229 void iwl4965_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
1230 struct ieee80211_tx_info *info)
1231 {
1232 struct ieee80211_tx_rate *r = &info->control.rates[0];
1233
1234 info->antenna_sel_tx =
1235 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1236 if (rate_n_flags & RATE_MCS_HT_MSK)
1237 r->flags |= IEEE80211_TX_RC_MCS;
1238 if (rate_n_flags & RATE_MCS_GF_MSK)
1239 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1240 if (rate_n_flags & RATE_MCS_HT40_MSK)
1241 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1242 if (rate_n_flags & RATE_MCS_DUP_MSK)
1243 r->flags |= IEEE80211_TX_RC_DUP_DATA;
1244 if (rate_n_flags & RATE_MCS_SGI_MSK)
1245 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1246 r->idx = iwl4965_hwrate_to_mac80211_idx(rate_n_flags, info->band);
1247 }
1248
1249 /**
1250 * iwl4965_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1251 *
1252 * Handles block-acknowledge notification from device, which reports success
1253 * of frames sent via aggregation.
1254 */
1255 void iwl4965_rx_reply_compressed_ba(struct iwl_priv *priv,
1256 struct iwl_rx_mem_buffer *rxb)
1257 {
1258 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1259 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1260 struct iwl_tx_queue *txq = NULL;
1261 struct iwl_ht_agg *agg;
1262 int index;
1263 int sta_id;
1264 int tid;
1265 unsigned long flags;
1266
1267 /* "flow" corresponds to Tx queue */
1268 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1269
1270 /* "ssn" is start of block-ack Tx window, corresponds to index
1271 * (in Tx queue's circular buffer) of first TFD/frame in window */
1272 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1273
1274 if (scd_flow >= priv->hw_params.max_txq_num) {
1275 IWL_ERR(priv,
1276 "BUG_ON scd_flow is bigger than number of queues\n");
1277 return;
1278 }
1279
1280 txq = &priv->txq[scd_flow];
1281 sta_id = ba_resp->sta_id;
1282 tid = ba_resp->tid;
1283 agg = &priv->stations[sta_id].tid[tid].agg;
1284 if (unlikely(agg->txq_id != scd_flow)) {
1285 /*
1286 * FIXME: this is a uCode bug which need to be addressed,
1287 * log the information and return for now!
1288 * since it is possible happen very often and in order
1289 * not to fill the syslog, don't enable the logging by default
1290 */
1291 IWL_DEBUG_TX_REPLY(priv,
1292 "BA scd_flow %d does not match txq_id %d\n",
1293 scd_flow, agg->txq_id);
1294 return;
1295 }
1296
1297 /* Find index just before block-ack window */
1298 index = iwl_legacy_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
1299
1300 spin_lock_irqsave(&priv->sta_lock, flags);
1301
1302 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1303 "sta_id = %d\n",
1304 agg->wait_for_ba,
1305 (u8 *) &ba_resp->sta_addr_lo32,
1306 ba_resp->sta_id);
1307 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx,"
1308 "scd_flow = "
1309 "%d, scd_ssn = %d\n",
1310 ba_resp->tid,
1311 ba_resp->seq_ctl,
1312 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1313 ba_resp->scd_flow,
1314 ba_resp->scd_ssn);
1315 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
1316 agg->start_idx,
1317 (unsigned long long)agg->bitmap);
1318
1319 /* Update driver's record of ACK vs. not for each frame in window */
1320 iwl4965_tx_status_reply_compressed_ba(priv, agg, ba_resp);
1321
1322 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1323 * block-ack window (we assume that they've been successfully
1324 * transmitted ... if not, it's too late anyway). */
1325 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
1326 /* calculate mac80211 ampdu sw queue to wake */
1327 int freed = iwl4965_tx_queue_reclaim(priv, scd_flow, index);
1328 iwl4965_free_tfds_in_queue(priv, sta_id, tid, freed);
1329
1330 if ((iwl_legacy_queue_space(&txq->q) > txq->q.low_mark) &&
1331 priv->mac80211_registered &&
1332 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
1333 iwl_legacy_wake_queue(priv, txq);
1334
1335 iwl4965_txq_check_empty(priv, sta_id, tid, scd_flow);
1336 }
1337
1338 spin_unlock_irqrestore(&priv->sta_lock, flags);
1339 }
1340
1341 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
1342 const char *iwl4965_get_tx_fail_reason(u32 status)
1343 {
1344 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1345 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1346
1347 switch (status & TX_STATUS_MSK) {
1348 case TX_STATUS_SUCCESS:
1349 return "SUCCESS";
1350 TX_STATUS_POSTPONE(DELAY);
1351 TX_STATUS_POSTPONE(FEW_BYTES);
1352 TX_STATUS_POSTPONE(QUIET_PERIOD);
1353 TX_STATUS_POSTPONE(CALC_TTAK);
1354 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1355 TX_STATUS_FAIL(SHORT_LIMIT);
1356 TX_STATUS_FAIL(LONG_LIMIT);
1357 TX_STATUS_FAIL(FIFO_UNDERRUN);
1358 TX_STATUS_FAIL(DRAIN_FLOW);
1359 TX_STATUS_FAIL(RFKILL_FLUSH);
1360 TX_STATUS_FAIL(LIFE_EXPIRE);
1361 TX_STATUS_FAIL(DEST_PS);
1362 TX_STATUS_FAIL(HOST_ABORTED);
1363 TX_STATUS_FAIL(BT_RETRY);
1364 TX_STATUS_FAIL(STA_INVALID);
1365 TX_STATUS_FAIL(FRAG_DROPPED);
1366 TX_STATUS_FAIL(TID_DISABLE);
1367 TX_STATUS_FAIL(FIFO_FLUSHED);
1368 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
1369 TX_STATUS_FAIL(PASSIVE_NO_RX);
1370 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
1371 }
1372
1373 return "UNKNOWN";
1374
1375 #undef TX_STATUS_FAIL
1376 #undef TX_STATUS_POSTPONE
1377 }
1378 #endif /* CONFIG_IWLWIFI_LEGACY_DEBUG */
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