1 /******************************************************************************
5 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
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.
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.
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,
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *****************************************************************************/
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
39 #include "iwl-helpers.h"
40 #include "iwl-agn-hw.h"
44 * mac80211 queues, ACs, hardware queues, FIFOs.
46 * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
48 * Mac80211 uses the following numbers, which we get as from it
49 * by way of skb_get_queue_mapping(skb):
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.
64 * Due to the way hw queues are set up (by the hw specific modules like
65 * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
69 static const u8 tid_to_ac[] = {
70 /* this matches the mac80211 numbers */
71 2, 3, 3, 2, 1, 1, 0, 0
74 static const u8 ac_to_fifo[] = {
81 static inline int get_fifo_from_ac(u8 ac)
83 return ac_to_fifo[ac];
86 static inline int get_ac_from_tid(u16 tid)
88 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
89 return tid_to_ac[tid];
91 /* no support for TIDs 8-15 yet */
95 static inline int get_fifo_from_tid(u16 tid)
97 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
98 return get_fifo_from_ac(tid_to_ac[tid]);
100 /* no support for TIDs 8-15 yet */
105 * iwlagn_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
107 void iwlagn_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
108 struct iwl_tx_queue *txq,
111 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
112 int write_ptr = txq->q.write_ptr;
113 int txq_id = txq->q.id;
116 u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
119 WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
121 if (txq_id != IWL_CMD_QUEUE_NUM) {
122 sta_id = txq->cmd[txq->q.write_ptr]->cmd.tx.sta_id;
123 sec_ctl = txq->cmd[txq->q.write_ptr]->cmd.tx.sec_ctl;
125 switch (sec_ctl & TX_CMD_SEC_MSK) {
129 case TX_CMD_SEC_TKIP:
133 len += WEP_IV_LEN + WEP_ICV_LEN;
138 bc_ent = cpu_to_le16((len & 0xFFF) | (sta_id << 12));
140 scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
142 if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
144 tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
147 void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
148 struct iwl_tx_queue *txq)
150 struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
151 int txq_id = txq->q.id;
152 int read_ptr = txq->q.read_ptr;
156 WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
158 if (txq_id != IWL_CMD_QUEUE_NUM)
159 sta_id = txq->cmd[read_ptr]->cmd.tx.sta_id;
161 bc_ent = cpu_to_le16(1 | (sta_id << 12));
162 scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
164 if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
166 tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
169 static int iwlagn_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
176 scd_q2ratid = ra_tid & IWL_SCD_QUEUE_RA_TID_MAP_RATID_MSK;
178 tbl_dw_addr = priv->scd_base_addr +
179 IWLAGN_SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
181 tbl_dw = iwl_read_targ_mem(priv, tbl_dw_addr);
184 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
186 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
188 iwl_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
193 static void iwlagn_tx_queue_stop_scheduler(struct iwl_priv *priv, u16 txq_id)
195 /* Simply stop the queue, but don't change any configuration;
196 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
198 IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
199 (0 << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE)|
200 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
203 void iwlagn_set_wr_ptrs(struct iwl_priv *priv,
204 int txq_id, u32 index)
206 iwl_write_direct32(priv, HBUS_TARG_WRPTR,
207 (index & 0xff) | (txq_id << 8));
208 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_RDPTR(txq_id), index);
211 void iwlagn_tx_queue_set_status(struct iwl_priv *priv,
212 struct iwl_tx_queue *txq,
213 int tx_fifo_id, int scd_retry)
215 int txq_id = txq->q.id;
216 int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;
218 iwl_write_prph(priv, IWLAGN_SCD_QUEUE_STATUS_BITS(txq_id),
219 (active << IWLAGN_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
220 (tx_fifo_id << IWLAGN_SCD_QUEUE_STTS_REG_POS_TXF) |
221 (1 << IWLAGN_SCD_QUEUE_STTS_REG_POS_WSL) |
222 IWLAGN_SCD_QUEUE_STTS_REG_MSK);
224 txq->sched_retry = scd_retry;
226 IWL_DEBUG_INFO(priv, "%s %s Queue %d on FIFO %d\n",
227 active ? "Activate" : "Deactivate",
228 scd_retry ? "BA" : "AC/CMD", txq_id, tx_fifo_id);
231 int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id,
232 int tx_fifo, int sta_id, int tid, u16 ssn_idx)
237 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
238 (IWLAGN_FIRST_AMPDU_QUEUE + priv->cfg->num_of_ampdu_queues
241 "queue number out of range: %d, must be %d to %d\n",
242 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
243 IWLAGN_FIRST_AMPDU_QUEUE +
244 priv->cfg->num_of_ampdu_queues - 1);
248 ra_tid = BUILD_RAxTID(sta_id, tid);
250 /* Modify device's station table to Tx this TID */
251 iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
253 spin_lock_irqsave(&priv->lock, flags);
255 /* Stop this Tx queue before configuring it */
256 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
258 /* Map receiver-address / traffic-ID to this queue */
259 iwlagn_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
261 /* Set this queue as a chain-building queue */
262 iwl_set_bits_prph(priv, IWLAGN_SCD_QUEUECHAIN_SEL, (1<<txq_id));
264 /* enable aggregations for the queue */
265 iwl_set_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1<<txq_id));
267 /* Place first TFD at index corresponding to start sequence number.
268 * Assumes that ssn_idx is valid (!= 0xFFF) */
269 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
270 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
271 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
273 /* Set up Tx window size and frame limit for this queue */
274 iwl_write_targ_mem(priv, priv->scd_base_addr +
275 IWLAGN_SCD_CONTEXT_QUEUE_OFFSET(txq_id) +
278 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
279 IWLAGN_SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
281 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
282 IWLAGN_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
284 iwl_set_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
286 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
287 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
289 spin_unlock_irqrestore(&priv->lock, flags);
294 int iwlagn_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
295 u16 ssn_idx, u8 tx_fifo)
297 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
298 (IWLAGN_FIRST_AMPDU_QUEUE + priv->cfg->num_of_ampdu_queues
301 "queue number out of range: %d, must be %d to %d\n",
302 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
303 IWLAGN_FIRST_AMPDU_QUEUE +
304 priv->cfg->num_of_ampdu_queues - 1);
308 iwlagn_tx_queue_stop_scheduler(priv, txq_id);
310 iwl_clear_bits_prph(priv, IWLAGN_SCD_AGGR_SEL, (1 << txq_id));
312 priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
313 priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
314 /* supposes that ssn_idx is valid (!= 0xFFF) */
315 iwlagn_set_wr_ptrs(priv, txq_id, ssn_idx);
317 iwl_clear_bits_prph(priv, IWLAGN_SCD_INTERRUPT_MASK, (1 << txq_id));
318 iwl_txq_ctx_deactivate(priv, txq_id);
319 iwlagn_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
325 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
326 * must be called under priv->lock and mac access
328 void iwlagn_txq_set_sched(struct iwl_priv *priv, u32 mask)
330 iwl_write_prph(priv, IWLAGN_SCD_TXFACT, mask);
333 static inline int get_queue_from_ac(u16 ac)
339 * handle build REPLY_TX command notification.
341 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
342 struct iwl_tx_cmd *tx_cmd,
343 struct ieee80211_tx_info *info,
344 struct ieee80211_hdr *hdr,
347 __le16 fc = hdr->frame_control;
348 __le32 tx_flags = tx_cmd->tx_flags;
350 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
351 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
352 tx_flags |= TX_CMD_FLG_ACK_MSK;
353 if (ieee80211_is_mgmt(fc))
354 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
355 if (ieee80211_is_probe_resp(fc) &&
356 !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
357 tx_flags |= TX_CMD_FLG_TSF_MSK;
359 tx_flags &= (~TX_CMD_FLG_ACK_MSK);
360 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
363 if (ieee80211_is_back_req(fc))
364 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
367 tx_cmd->sta_id = std_id;
368 if (ieee80211_has_morefrags(fc))
369 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
371 if (ieee80211_is_data_qos(fc)) {
372 u8 *qc = ieee80211_get_qos_ctl(hdr);
373 tx_cmd->tid_tspec = qc[0] & 0xf;
374 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
376 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
379 priv->cfg->ops->utils->rts_tx_cmd_flag(info, &tx_flags);
381 if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK))
382 tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
384 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
385 if (ieee80211_is_mgmt(fc)) {
386 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
387 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
389 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
391 tx_cmd->timeout.pm_frame_timeout = 0;
394 tx_cmd->driver_txop = 0;
395 tx_cmd->tx_flags = tx_flags;
396 tx_cmd->next_frame_len = 0;
399 #define RTS_DFAULT_RETRY_LIMIT 60
401 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
402 struct iwl_tx_cmd *tx_cmd,
403 struct ieee80211_tx_info *info,
412 /* Set retry limit on DATA packets and Probe Responses*/
413 if (ieee80211_is_probe_resp(fc))
414 data_retry_limit = 3;
416 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
417 tx_cmd->data_retry_limit = data_retry_limit;
419 /* Set retry limit on RTS packets */
420 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
421 if (data_retry_limit < rts_retry_limit)
422 rts_retry_limit = data_retry_limit;
423 tx_cmd->rts_retry_limit = rts_retry_limit;
425 /* DATA packets will use the uCode station table for rate/antenna
427 if (ieee80211_is_data(fc)) {
428 tx_cmd->initial_rate_index = 0;
429 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
434 * If the current TX rate stored in mac80211 has the MCS bit set, it's
435 * not really a TX rate. Thus, we use the lowest supported rate for
436 * this band. Also use the lowest supported rate if the stored rate
439 rate_idx = info->control.rates[0].idx;
440 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
441 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
442 rate_idx = rate_lowest_index(&priv->bands[info->band],
444 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
445 if (info->band == IEEE80211_BAND_5GHZ)
446 rate_idx += IWL_FIRST_OFDM_RATE;
447 /* Get PLCP rate for tx_cmd->rate_n_flags */
448 rate_plcp = iwl_rates[rate_idx].plcp;
449 /* Zero out flags for this packet */
452 /* Set CCK flag as needed */
453 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
454 rate_flags |= RATE_MCS_CCK_MSK;
456 /* Set up RTS and CTS flags for certain packets */
457 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
458 case cpu_to_le16(IEEE80211_STYPE_AUTH):
459 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
460 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
461 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
462 if (tx_cmd->tx_flags & TX_CMD_FLG_RTS_MSK) {
463 tx_cmd->tx_flags &= ~TX_CMD_FLG_RTS_MSK;
464 tx_cmd->tx_flags |= TX_CMD_FLG_CTS_MSK;
471 /* Set up antennas */
472 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant);
473 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
475 /* Set the rate in the TX cmd */
476 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
479 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
480 struct ieee80211_tx_info *info,
481 struct iwl_tx_cmd *tx_cmd,
482 struct sk_buff *skb_frag,
485 struct ieee80211_key_conf *keyconf = info->control.hw_key;
487 switch (keyconf->alg) {
489 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
490 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
491 if (info->flags & IEEE80211_TX_CTL_AMPDU)
492 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
493 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
497 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
498 ieee80211_get_tkip_key(keyconf, skb_frag,
499 IEEE80211_TKIP_P2_KEY, tx_cmd->key);
500 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
504 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
505 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
507 if (keyconf->keylen == WEP_KEY_LEN_128)
508 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
510 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
512 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
513 "with key %d\n", keyconf->keyidx);
517 IWL_ERR(priv, "Unknown encode alg %d\n", keyconf->alg);
523 * start REPLY_TX command process
525 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
527 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
528 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
529 struct ieee80211_sta *sta = info->control.sta;
530 struct iwl_station_priv *sta_priv = NULL;
531 struct iwl_tx_queue *txq;
533 struct iwl_device_cmd *out_cmd;
534 struct iwl_cmd_meta *out_meta;
535 struct iwl_tx_cmd *tx_cmd;
537 dma_addr_t phys_addr;
538 dma_addr_t txcmd_phys;
539 dma_addr_t scratch_phys;
540 u16 len, len_org, firstlen, secondlen;
545 u8 wait_write_ptr = 0;
550 spin_lock_irqsave(&priv->lock, flags);
551 if (iwl_is_rfkill(priv)) {
552 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
556 fc = hdr->frame_control;
558 #ifdef CONFIG_IWLWIFI_DEBUG
559 if (ieee80211_is_auth(fc))
560 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
561 else if (ieee80211_is_assoc_req(fc))
562 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
563 else if (ieee80211_is_reassoc_req(fc))
564 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
567 hdr_len = ieee80211_hdrlen(fc);
569 /* Find index into station table for destination station */
570 if (!info->control.sta)
571 sta_id = priv->hw_params.bcast_sta_id;
573 sta_id = iwl_sta_id(info->control.sta);
574 if (sta_id == IWL_INVALID_STATION) {
575 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
580 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
583 sta_priv = (void *)sta->drv_priv;
585 if (sta_priv && sta_id != priv->hw_params.bcast_sta_id &&
587 WARN_ON(!(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE));
589 * This sends an asynchronous command to the device,
590 * but we can rely on it being processed before the
591 * next frame is processed -- and the next frame to
592 * this station is the one that will consume this
594 * For now set the counter to just 1 since we do not
597 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
600 txq_id = get_queue_from_ac(skb_get_queue_mapping(skb));
601 if (ieee80211_is_data_qos(fc)) {
602 qc = ieee80211_get_qos_ctl(hdr);
603 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
604 if (unlikely(tid >= MAX_TID_COUNT))
606 seq_number = priv->stations[sta_id].tid[tid].seq_number;
607 seq_number &= IEEE80211_SCTL_SEQ;
608 hdr->seq_ctrl = hdr->seq_ctrl &
609 cpu_to_le16(IEEE80211_SCTL_FRAG);
610 hdr->seq_ctrl |= cpu_to_le16(seq_number);
612 /* aggregation is on for this <sta,tid> */
613 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
614 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
615 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
619 txq = &priv->txq[txq_id];
620 swq_id = txq->swq_id;
623 if (unlikely(iwl_queue_space(q) < q->high_mark))
626 if (ieee80211_is_data_qos(fc))
627 priv->stations[sta_id].tid[tid].tfds_in_queue++;
629 /* Set up driver data for this TFD */
630 memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
631 txq->txb[q->write_ptr].skb[0] = skb;
633 /* Set up first empty entry in queue's array of Tx/cmd buffers */
634 out_cmd = txq->cmd[q->write_ptr];
635 out_meta = &txq->meta[q->write_ptr];
636 tx_cmd = &out_cmd->cmd.tx;
637 memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
638 memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd));
641 * Set up the Tx-command (not MAC!) header.
642 * Store the chosen Tx queue and TFD index within the sequence field;
643 * after Tx, uCode's Tx response will return this value so driver can
644 * locate the frame within the tx queue and do post-tx processing.
646 out_cmd->hdr.cmd = REPLY_TX;
647 out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
648 INDEX_TO_SEQ(q->write_ptr)));
650 /* Copy MAC header from skb into command buffer */
651 memcpy(tx_cmd->hdr, hdr, hdr_len);
654 /* Total # bytes to be transmitted */
656 tx_cmd->len = cpu_to_le16(len);
658 if (info->control.hw_key)
659 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
661 /* TODO need this for burst mode later on */
662 iwlagn_tx_cmd_build_basic(priv, tx_cmd, info, hdr, sta_id);
663 iwl_dbg_log_tx_data_frame(priv, len, hdr);
665 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
667 iwl_update_stats(priv, true, fc, len);
669 * Use the first empty entry in this queue's command buffer array
670 * to contain the Tx command and MAC header concatenated together
671 * (payload data will be in another buffer).
672 * Size of this varies, due to varying MAC header length.
673 * If end is not dword aligned, we'll have 2 extra bytes at the end
674 * of the MAC header (device reads on dword boundaries).
675 * We'll tell device about this padding later.
677 len = sizeof(struct iwl_tx_cmd) +
678 sizeof(struct iwl_cmd_header) + hdr_len;
681 firstlen = len = (len + 3) & ~3;
688 /* Tell NIC about any 2-byte padding after MAC header */
690 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
692 /* Physical address of this Tx command's header (not MAC header!),
693 * within command buffer array. */
694 txcmd_phys = pci_map_single(priv->pci_dev,
696 PCI_DMA_BIDIRECTIONAL);
697 pci_unmap_addr_set(out_meta, mapping, txcmd_phys);
698 pci_unmap_len_set(out_meta, len, len);
699 /* Add buffer containing Tx command and MAC(!) header to TFD's
701 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
702 txcmd_phys, len, 1, 0);
704 if (!ieee80211_has_morefrags(hdr->frame_control)) {
705 txq->need_update = 1;
707 priv->stations[sta_id].tid[tid].seq_number = seq_number;
710 txq->need_update = 0;
713 /* Set up TFD's 2nd entry to point directly to remainder of skb,
714 * if any (802.11 null frames have no payload). */
715 secondlen = len = skb->len - hdr_len;
717 phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
718 len, PCI_DMA_TODEVICE);
719 priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
724 scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
725 offsetof(struct iwl_tx_cmd, scratch);
727 len = sizeof(struct iwl_tx_cmd) +
728 sizeof(struct iwl_cmd_header) + hdr_len;
729 /* take back ownership of DMA buffer to enable update */
730 pci_dma_sync_single_for_cpu(priv->pci_dev, txcmd_phys,
731 len, PCI_DMA_BIDIRECTIONAL);
732 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
733 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
735 IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
736 le16_to_cpu(out_cmd->hdr.sequence));
737 IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
738 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
739 iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
741 /* Set up entry for this TFD in Tx byte-count array */
742 if (info->flags & IEEE80211_TX_CTL_AMPDU)
743 priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq,
744 le16_to_cpu(tx_cmd->len));
746 pci_dma_sync_single_for_device(priv->pci_dev, txcmd_phys,
747 len, PCI_DMA_BIDIRECTIONAL);
749 trace_iwlwifi_dev_tx(priv,
750 &((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],
751 sizeof(struct iwl_tfd),
752 &out_cmd->hdr, firstlen,
753 skb->data + hdr_len, secondlen);
755 /* Tell device the write index *just past* this latest filled TFD */
756 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
757 iwl_txq_update_write_ptr(priv, txq);
758 spin_unlock_irqrestore(&priv->lock, flags);
761 * At this point the frame is "transmitted" successfully
762 * and we will get a TX status notification eventually,
763 * regardless of the value of ret. "ret" only indicates
764 * whether or not we should update the write pointer.
767 /* avoid atomic ops if it isn't an associated client */
768 if (sta_priv && sta_priv->client)
769 atomic_inc(&sta_priv->pending_frames);
771 if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) {
772 if (wait_write_ptr) {
773 spin_lock_irqsave(&priv->lock, flags);
774 txq->need_update = 1;
775 iwl_txq_update_write_ptr(priv, txq);
776 spin_unlock_irqrestore(&priv->lock, flags);
778 iwl_stop_queue(priv, txq->swq_id);
785 spin_unlock_irqrestore(&priv->lock, flags);
789 static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
790 struct iwl_dma_ptr *ptr, size_t size)
792 ptr->addr = dma_alloc_coherent(&priv->pci_dev->dev, size, &ptr->dma,
800 static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
801 struct iwl_dma_ptr *ptr)
803 if (unlikely(!ptr->addr))
806 dma_free_coherent(&priv->pci_dev->dev, ptr->size, ptr->addr, ptr->dma);
807 memset(ptr, 0, sizeof(*ptr));
811 * iwlagn_hw_txq_ctx_free - Free TXQ Context
813 * Destroy all TX DMA queues and structures
815 void iwlagn_hw_txq_ctx_free(struct iwl_priv *priv)
821 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
822 if (txq_id == IWL_CMD_QUEUE_NUM)
823 iwl_cmd_queue_free(priv);
825 iwl_tx_queue_free(priv, txq_id);
827 iwlagn_free_dma_ptr(priv, &priv->kw);
829 iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
831 /* free tx queue structure */
832 iwl_free_txq_mem(priv);
836 * iwlagn_txq_ctx_alloc - allocate TX queue context
837 * Allocate all Tx DMA structures and initialize them
842 int iwlagn_txq_ctx_alloc(struct iwl_priv *priv)
845 int txq_id, slots_num;
848 /* Free all tx/cmd queues and keep-warm buffer */
849 iwlagn_hw_txq_ctx_free(priv);
851 ret = iwlagn_alloc_dma_ptr(priv, &priv->scd_bc_tbls,
852 priv->hw_params.scd_bc_tbls_size);
854 IWL_ERR(priv, "Scheduler BC Table allocation failed\n");
857 /* Alloc keep-warm buffer */
858 ret = iwlagn_alloc_dma_ptr(priv, &priv->kw, IWL_KW_SIZE);
860 IWL_ERR(priv, "Keep Warm allocation failed\n");
864 /* allocate tx queue structure */
865 ret = iwl_alloc_txq_mem(priv);
869 spin_lock_irqsave(&priv->lock, flags);
871 /* Turn off all Tx DMA fifos */
872 priv->cfg->ops->lib->txq_set_sched(priv, 0);
874 /* Tell NIC where to find the "keep warm" buffer */
875 iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
877 spin_unlock_irqrestore(&priv->lock, flags);
879 /* Alloc and init all Tx queues, including the command queue (#4) */
880 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
881 slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ?
882 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
883 ret = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
886 IWL_ERR(priv, "Tx %d queue init failed\n", txq_id);
894 iwlagn_hw_txq_ctx_free(priv);
895 iwlagn_free_dma_ptr(priv, &priv->kw);
897 iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
902 void iwlagn_txq_ctx_reset(struct iwl_priv *priv)
904 int txq_id, slots_num;
907 spin_lock_irqsave(&priv->lock, flags);
909 /* Turn off all Tx DMA fifos */
910 priv->cfg->ops->lib->txq_set_sched(priv, 0);
912 /* Tell NIC where to find the "keep warm" buffer */
913 iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG, priv->kw.dma >> 4);
915 spin_unlock_irqrestore(&priv->lock, flags);
917 /* Alloc and init all Tx queues, including the command queue (#4) */
918 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
919 slots_num = txq_id == IWL_CMD_QUEUE_NUM ?
920 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
921 iwl_tx_queue_reset(priv, &priv->txq[txq_id], slots_num, txq_id);
926 * iwlagn_txq_ctx_stop - Stop all Tx DMA channels
928 void iwlagn_txq_ctx_stop(struct iwl_priv *priv)
933 /* Turn off all Tx DMA fifos */
934 spin_lock_irqsave(&priv->lock, flags);
936 priv->cfg->ops->lib->txq_set_sched(priv, 0);
938 /* Stop each Tx DMA channel, and wait for it to be idle */
939 for (ch = 0; ch < priv->hw_params.dma_chnl_num; ch++) {
940 iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
941 iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
942 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
945 spin_unlock_irqrestore(&priv->lock, flags);
949 * Find first available (lowest unused) Tx Queue, mark it "active".
950 * Called only when finding queue for aggregation.
951 * Should never return anything < 7, because they should already
952 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
954 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
958 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
959 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
964 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
965 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
972 struct iwl_tid_data *tid_data;
974 tx_fifo = get_fifo_from_tid(tid);
975 if (unlikely(tx_fifo < 0))
978 IWL_WARN(priv, "%s on ra = %pM tid = %d\n",
979 __func__, sta->addr, tid);
981 sta_id = iwl_sta_id(sta);
982 if (sta_id == IWL_INVALID_STATION) {
983 IWL_ERR(priv, "Start AGG on invalid station\n");
986 if (unlikely(tid >= MAX_TID_COUNT))
989 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
990 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
994 txq_id = iwlagn_txq_ctx_activate_free(priv);
996 IWL_ERR(priv, "No free aggregation queue available\n");
1000 spin_lock_irqsave(&priv->sta_lock, flags);
1001 tid_data = &priv->stations[sta_id].tid[tid];
1002 *ssn = SEQ_TO_SN(tid_data->seq_number);
1003 tid_data->agg.txq_id = txq_id;
1004 priv->txq[txq_id].swq_id = iwl_virtual_agg_queue_num(get_ac_from_tid(tid), txq_id);
1005 spin_unlock_irqrestore(&priv->sta_lock, flags);
1007 ret = priv->cfg->ops->lib->txq_agg_enable(priv, txq_id, tx_fifo,
1012 if (tid_data->tfds_in_queue == 0) {
1013 IWL_DEBUG_HT(priv, "HW queue is empty\n");
1014 tid_data->agg.state = IWL_AGG_ON;
1015 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1017 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
1018 tid_data->tfds_in_queue);
1019 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
1024 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
1025 struct ieee80211_sta *sta, u16 tid)
1027 int tx_fifo_id, txq_id, sta_id, ssn = -1;
1028 struct iwl_tid_data *tid_data;
1029 int write_ptr, read_ptr;
1030 unsigned long flags;
1032 tx_fifo_id = get_fifo_from_tid(tid);
1033 if (unlikely(tx_fifo_id < 0))
1036 sta_id = iwl_sta_id(sta);
1038 if (sta_id == IWL_INVALID_STATION) {
1039 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1043 if (priv->stations[sta_id].tid[tid].agg.state ==
1044 IWL_EMPTYING_HW_QUEUE_ADDBA) {
1045 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
1046 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1047 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
1051 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON)
1052 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
1054 tid_data = &priv->stations[sta_id].tid[tid];
1055 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
1056 txq_id = tid_data->agg.txq_id;
1057 write_ptr = priv->txq[txq_id].q.write_ptr;
1058 read_ptr = priv->txq[txq_id].q.read_ptr;
1060 /* The queue is not empty */
1061 if (write_ptr != read_ptr) {
1062 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
1063 priv->stations[sta_id].tid[tid].agg.state =
1064 IWL_EMPTYING_HW_QUEUE_DELBA;
1068 IWL_DEBUG_HT(priv, "HW queue is empty\n");
1069 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
1071 spin_lock_irqsave(&priv->lock, flags);
1073 * the only reason this call can fail is queue number out of range,
1074 * which can happen if uCode is reloaded and all the station
1075 * information are lost. if it is outside the range, there is no need
1076 * to deactivate the uCode queue, just return "success" to allow
1077 * mac80211 to clean up it own data.
1079 priv->cfg->ops->lib->txq_agg_disable(priv, txq_id, ssn,
1081 spin_unlock_irqrestore(&priv->lock, flags);
1083 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1088 int iwlagn_txq_check_empty(struct iwl_priv *priv,
1089 int sta_id, u8 tid, int txq_id)
1091 struct iwl_queue *q = &priv->txq[txq_id].q;
1092 u8 *addr = priv->stations[sta_id].sta.sta.addr;
1093 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
1095 switch (priv->stations[sta_id].tid[tid].agg.state) {
1096 case IWL_EMPTYING_HW_QUEUE_DELBA:
1097 /* We are reclaiming the last packet of the */
1098 /* aggregated HW queue */
1099 if ((txq_id == tid_data->agg.txq_id) &&
1100 (q->read_ptr == q->write_ptr)) {
1101 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
1102 int tx_fifo = get_fifo_from_tid(tid);
1103 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
1104 priv->cfg->ops->lib->txq_agg_disable(priv, txq_id,
1106 tid_data->agg.state = IWL_AGG_OFF;
1107 ieee80211_stop_tx_ba_cb_irqsafe(priv->vif, addr, tid);
1110 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1111 /* We are reclaiming the last packet of the queue */
1112 if (tid_data->tfds_in_queue == 0) {
1113 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
1114 tid_data->agg.state = IWL_AGG_ON;
1115 ieee80211_start_tx_ba_cb_irqsafe(priv->vif, addr, tid);
1122 static void iwlagn_tx_status(struct iwl_priv *priv, struct sk_buff *skb)
1124 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1125 struct ieee80211_sta *sta;
1126 struct iwl_station_priv *sta_priv;
1129 sta = ieee80211_find_sta(priv->vif, hdr->addr1);
1131 sta_priv = (void *)sta->drv_priv;
1132 /* avoid atomic ops if this isn't a client */
1133 if (sta_priv->client &&
1134 atomic_dec_return(&sta_priv->pending_frames) == 0)
1135 ieee80211_sta_block_awake(priv->hw, sta, false);
1139 ieee80211_tx_status_irqsafe(priv->hw, skb);
1142 int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
1144 struct iwl_tx_queue *txq = &priv->txq[txq_id];
1145 struct iwl_queue *q = &txq->q;
1146 struct iwl_tx_info *tx_info;
1148 struct ieee80211_hdr *hdr;
1150 if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
1151 IWL_ERR(priv, "Read index for DMA queue txq id (%d), index %d, "
1152 "is out of range [0-%d] %d %d.\n", txq_id,
1153 index, q->n_bd, q->write_ptr, q->read_ptr);
1157 for (index = iwl_queue_inc_wrap(index, q->n_bd);
1158 q->read_ptr != index;
1159 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
1161 tx_info = &txq->txb[txq->q.read_ptr];
1162 iwlagn_tx_status(priv, tx_info->skb[0]);
1164 hdr = (struct ieee80211_hdr *)tx_info->skb[0]->data;
1165 if (hdr && ieee80211_is_data_qos(hdr->frame_control))
1167 tx_info->skb[0] = NULL;
1169 if (priv->cfg->ops->lib->txq_inval_byte_cnt_tbl)
1170 priv->cfg->ops->lib->txq_inval_byte_cnt_tbl(priv, txq);
1172 priv->cfg->ops->lib->txq_free_tfd(priv, txq);
1178 * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
1180 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
1181 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
1183 static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
1184 struct iwl_ht_agg *agg,
1185 struct iwl_compressed_ba_resp *ba_resp)
1189 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
1190 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1193 struct ieee80211_tx_info *info;
1195 if (unlikely(!agg->wait_for_ba)) {
1196 IWL_ERR(priv, "Received BA when not expected\n");
1200 /* Mark that the expected block-ack response arrived */
1201 agg->wait_for_ba = 0;
1202 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
1204 /* Calculate shift to align block-ack bits with our Tx window bits */
1205 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
1206 if (sh < 0) /* tbw something is wrong with indices */
1209 /* don't use 64-bit values for now */
1210 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
1212 if (agg->frame_count > (64 - sh)) {
1213 IWL_DEBUG_TX_REPLY(priv, "more frames than bitmap size");
1217 /* check for success or failure according to the
1218 * transmitted bitmap and block-ack bitmap */
1219 bitmap &= agg->bitmap;
1221 /* For each frame attempted in aggregation,
1222 * update driver's record of tx frame's status. */
1223 for (i = 0; i < agg->frame_count ; i++) {
1224 ack = bitmap & (1ULL << i);
1226 IWL_DEBUG_TX_REPLY(priv, "%s ON i=%d idx=%d raw=%d\n",
1227 ack ? "ACK" : "NACK", i, (agg->start_idx + i) & 0xff,
1228 agg->start_idx + i);
1231 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb[0]);
1232 memset(&info->status, 0, sizeof(info->status));
1233 info->flags |= IEEE80211_TX_STAT_ACK;
1234 info->flags |= IEEE80211_TX_STAT_AMPDU;
1235 info->status.ampdu_ack_len = successes;
1236 info->status.ampdu_ack_map = bitmap;
1237 info->status.ampdu_len = agg->frame_count;
1238 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
1240 IWL_DEBUG_TX_REPLY(priv, "Bitmap %llx\n", (unsigned long long)bitmap);
1246 * translate ucode response to mac80211 tx status control values
1248 void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
1249 struct ieee80211_tx_info *info)
1251 struct ieee80211_tx_rate *r = &info->control.rates[0];
1253 info->antenna_sel_tx =
1254 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1255 if (rate_n_flags & RATE_MCS_HT_MSK)
1256 r->flags |= IEEE80211_TX_RC_MCS;
1257 if (rate_n_flags & RATE_MCS_GF_MSK)
1258 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1259 if (rate_n_flags & RATE_MCS_HT40_MSK)
1260 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1261 if (rate_n_flags & RATE_MCS_DUP_MSK)
1262 r->flags |= IEEE80211_TX_RC_DUP_DATA;
1263 if (rate_n_flags & RATE_MCS_SGI_MSK)
1264 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1265 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
1269 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1271 * Handles block-acknowledge notification from device, which reports success
1272 * of frames sent via aggregation.
1274 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1275 struct iwl_rx_mem_buffer *rxb)
1277 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1278 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1279 struct iwl_tx_queue *txq = NULL;
1280 struct iwl_ht_agg *agg;
1285 /* "flow" corresponds to Tx queue */
1286 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1288 /* "ssn" is start of block-ack Tx window, corresponds to index
1289 * (in Tx queue's circular buffer) of first TFD/frame in window */
1290 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1292 if (scd_flow >= priv->hw_params.max_txq_num) {
1294 "BUG_ON scd_flow is bigger than number of queues\n");
1298 txq = &priv->txq[scd_flow];
1299 sta_id = ba_resp->sta_id;
1301 agg = &priv->stations[sta_id].tid[tid].agg;
1302 if (unlikely(agg->txq_id != scd_flow)) {
1303 IWL_ERR(priv, "BA scd_flow %d does not match txq_id %d\n",
1304 scd_flow, agg->txq_id);
1308 /* Find index just before block-ack window */
1309 index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
1311 /* TODO: Need to get this copy more safely - now good for debug */
1313 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1316 (u8 *) &ba_resp->sta_addr_lo32,
1318 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
1319 "%d, scd_ssn = %d\n",
1322 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1325 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
1327 (unsigned long long)agg->bitmap);
1329 /* Update driver's record of ACK vs. not for each frame in window */
1330 iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
1332 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1333 * block-ack window (we assume that they've been successfully
1334 * transmitted ... if not, it's too late anyway). */
1335 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
1336 /* calculate mac80211 ampdu sw queue to wake */
1337 int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
1338 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1340 if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
1341 priv->mac80211_registered &&
1342 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
1343 iwl_wake_queue(priv, txq->swq_id);
1345 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);