2060 lines · c
1/*2 * Atheros CARL9170 driver3 *4 * mac80211 interaction code5 *6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>7 * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>8 *9 * This program is free software; you can redistribute it and/or modify10 * it under the terms of the GNU General Public License as published by11 * the Free Software Foundation; either version 2 of the License, or12 * (at your option) any later version.13 *14 * This program is distributed in the hope that it will be useful,15 * but WITHOUT ANY WARRANTY; without even the implied warranty of16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the17 * GNU General Public License for more details.18 *19 * You should have received a copy of the GNU General Public License20 * along with this program; see the file COPYING. If not, see21 * http://www.gnu.org/licenses/.22 *23 * This file incorporates work covered by the following copyright and24 * permission notice:25 * Copyright (c) 2007-2008 Atheros Communications, Inc.26 *27 * Permission to use, copy, modify, and/or distribute this software for any28 * purpose with or without fee is hereby granted, provided that the above29 * copyright notice and this permission notice appear in all copies.30 *31 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES32 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF33 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR34 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES35 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN36 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF37 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.38 */39 40#include <linux/slab.h>41#include <linux/module.h>42#include <linux/etherdevice.h>43#include <linux/random.h>44#include <net/mac80211.h>45#include <net/cfg80211.h>46#include "hw.h"47#include "carl9170.h"48#include "cmd.h"49 50static bool modparam_nohwcrypt;51module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);52MODULE_PARM_DESC(nohwcrypt, "Disable hardware crypto offload.");53 54int modparam_noht;55module_param_named(noht, modparam_noht, int, 0444);56MODULE_PARM_DESC(noht, "Disable MPDU aggregation.");57 58#define RATE(_bitrate, _hw_rate, _txpidx, _flags) { \59 .bitrate = (_bitrate), \60 .flags = (_flags), \61 .hw_value = (_hw_rate) | (_txpidx) << 4, \62}63 64struct ieee80211_rate __carl9170_ratetable[] = {65 RATE(10, 0, 0, 0),66 RATE(20, 1, 1, IEEE80211_RATE_SHORT_PREAMBLE),67 RATE(55, 2, 2, IEEE80211_RATE_SHORT_PREAMBLE),68 RATE(110, 3, 3, IEEE80211_RATE_SHORT_PREAMBLE),69 RATE(60, 0xb, 0, 0),70 RATE(90, 0xf, 0, 0),71 RATE(120, 0xa, 0, 0),72 RATE(180, 0xe, 0, 0),73 RATE(240, 0x9, 0, 0),74 RATE(360, 0xd, 1, 0),75 RATE(480, 0x8, 2, 0),76 RATE(540, 0xc, 3, 0),77};78#undef RATE79 80#define carl9170_g_ratetable (__carl9170_ratetable + 0)81#define carl9170_g_ratetable_size 1282#define carl9170_a_ratetable (__carl9170_ratetable + 4)83#define carl9170_a_ratetable_size 884 85/*86 * NB: The hw_value is used as an index into the carl9170_phy_freq_params87 * array in phy.c so that we don't have to do frequency lookups!88 */89#define CHAN(_freq, _idx) { \90 .center_freq = (_freq), \91 .hw_value = (_idx), \92 .max_power = 18, /* XXX */ \93}94 95static struct ieee80211_channel carl9170_2ghz_chantable[] = {96 CHAN(2412, 0),97 CHAN(2417, 1),98 CHAN(2422, 2),99 CHAN(2427, 3),100 CHAN(2432, 4),101 CHAN(2437, 5),102 CHAN(2442, 6),103 CHAN(2447, 7),104 CHAN(2452, 8),105 CHAN(2457, 9),106 CHAN(2462, 10),107 CHAN(2467, 11),108 CHAN(2472, 12),109 CHAN(2484, 13),110};111 112static struct ieee80211_channel carl9170_5ghz_chantable[] = {113 CHAN(4920, 14),114 CHAN(4940, 15),115 CHAN(4960, 16),116 CHAN(4980, 17),117 CHAN(5040, 18),118 CHAN(5060, 19),119 CHAN(5080, 20),120 CHAN(5180, 21),121 CHAN(5200, 22),122 CHAN(5220, 23),123 CHAN(5240, 24),124 CHAN(5260, 25),125 CHAN(5280, 26),126 CHAN(5300, 27),127 CHAN(5320, 28),128 CHAN(5500, 29),129 CHAN(5520, 30),130 CHAN(5540, 31),131 CHAN(5560, 32),132 CHAN(5580, 33),133 CHAN(5600, 34),134 CHAN(5620, 35),135 CHAN(5640, 36),136 CHAN(5660, 37),137 CHAN(5680, 38),138 CHAN(5700, 39),139 CHAN(5745, 40),140 CHAN(5765, 41),141 CHAN(5785, 42),142 CHAN(5805, 43),143 CHAN(5825, 44),144 CHAN(5170, 45),145 CHAN(5190, 46),146 CHAN(5210, 47),147 CHAN(5230, 48),148};149#undef CHAN150 151#define CARL9170_HT_CAP \152{ \153 .ht_supported = true, \154 .cap = IEEE80211_HT_CAP_MAX_AMSDU | \155 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | \156 IEEE80211_HT_CAP_SGI_40 | \157 IEEE80211_HT_CAP_DSSSCCK40 | \158 IEEE80211_HT_CAP_SM_PS, \159 .ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K, \160 .ampdu_density = IEEE80211_HT_MPDU_DENSITY_8, \161 .mcs = { \162 .rx_mask = { 0xff, 0xff, 0, 0, 0x1, 0, 0, 0, 0, 0, }, \163 .rx_highest = cpu_to_le16(300), \164 .tx_params = IEEE80211_HT_MCS_TX_DEFINED, \165 }, \166}167 168static struct ieee80211_supported_band carl9170_band_2GHz = {169 .channels = carl9170_2ghz_chantable,170 .n_channels = ARRAY_SIZE(carl9170_2ghz_chantable),171 .bitrates = carl9170_g_ratetable,172 .n_bitrates = carl9170_g_ratetable_size,173 .ht_cap = CARL9170_HT_CAP,174};175 176static struct ieee80211_supported_band carl9170_band_5GHz = {177 .channels = carl9170_5ghz_chantable,178 .n_channels = ARRAY_SIZE(carl9170_5ghz_chantable),179 .bitrates = carl9170_a_ratetable,180 .n_bitrates = carl9170_a_ratetable_size,181 .ht_cap = CARL9170_HT_CAP,182};183 184static void carl9170_ampdu_gc(struct ar9170 *ar)185{186 struct carl9170_sta_tid *tid_info;187 LIST_HEAD(tid_gc);188 189 rcu_read_lock();190 list_for_each_entry_rcu(tid_info, &ar->tx_ampdu_list, list) {191 spin_lock_bh(&ar->tx_ampdu_list_lock);192 if (tid_info->state == CARL9170_TID_STATE_SHUTDOWN) {193 tid_info->state = CARL9170_TID_STATE_KILLED;194 list_del_rcu(&tid_info->list);195 ar->tx_ampdu_list_len--;196 list_add_tail(&tid_info->tmp_list, &tid_gc);197 }198 spin_unlock_bh(&ar->tx_ampdu_list_lock);199 200 }201 rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);202 rcu_read_unlock();203 204 synchronize_rcu();205 206 while (!list_empty(&tid_gc)) {207 struct sk_buff *skb;208 tid_info = list_first_entry(&tid_gc, struct carl9170_sta_tid,209 tmp_list);210 211 while ((skb = __skb_dequeue(&tid_info->queue)))212 carl9170_tx_status(ar, skb, false);213 214 list_del_init(&tid_info->tmp_list);215 kfree(tid_info);216 }217}218 219static void carl9170_flush(struct ar9170 *ar, bool drop_queued)220{221 if (drop_queued) {222 int i;223 224 /*225 * We can only drop frames which have not been uploaded226 * to the device yet.227 */228 229 for (i = 0; i < ar->hw->queues; i++) {230 struct sk_buff *skb;231 232 while ((skb = skb_dequeue(&ar->tx_pending[i]))) {233 struct ieee80211_tx_info *info;234 235 info = IEEE80211_SKB_CB(skb);236 if (info->flags & IEEE80211_TX_CTL_AMPDU)237 atomic_dec(&ar->tx_ampdu_upload);238 239 carl9170_tx_status(ar, skb, false);240 }241 }242 }243 244 /* Wait for all other outstanding frames to timeout. */245 if (atomic_read(&ar->tx_total_queued))246 WARN_ON(wait_for_completion_timeout(&ar->tx_flush, HZ) == 0);247}248 249static void carl9170_flush_ba(struct ar9170 *ar)250{251 struct sk_buff_head free;252 struct carl9170_sta_tid *tid_info;253 struct sk_buff *skb;254 255 __skb_queue_head_init(&free);256 257 rcu_read_lock();258 spin_lock_bh(&ar->tx_ampdu_list_lock);259 list_for_each_entry_rcu(tid_info, &ar->tx_ampdu_list, list) {260 if (tid_info->state > CARL9170_TID_STATE_SUSPEND) {261 tid_info->state = CARL9170_TID_STATE_SUSPEND;262 263 spin_lock(&tid_info->lock);264 while ((skb = __skb_dequeue(&tid_info->queue)))265 __skb_queue_tail(&free, skb);266 spin_unlock(&tid_info->lock);267 }268 }269 spin_unlock_bh(&ar->tx_ampdu_list_lock);270 rcu_read_unlock();271 272 while ((skb = __skb_dequeue(&free)))273 carl9170_tx_status(ar, skb, false);274}275 276static void carl9170_zap_queues(struct ar9170 *ar)277{278 struct carl9170_vif_info *cvif;279 unsigned int i;280 281 carl9170_ampdu_gc(ar);282 283 carl9170_flush_ba(ar);284 carl9170_flush(ar, true);285 286 for (i = 0; i < ar->hw->queues; i++) {287 spin_lock_bh(&ar->tx_status[i].lock);288 while (!skb_queue_empty(&ar->tx_status[i])) {289 struct sk_buff *skb;290 291 skb = skb_peek(&ar->tx_status[i]);292 carl9170_tx_get_skb(skb);293 spin_unlock_bh(&ar->tx_status[i].lock);294 carl9170_tx_drop(ar, skb);295 spin_lock_bh(&ar->tx_status[i].lock);296 carl9170_tx_put_skb(skb);297 }298 spin_unlock_bh(&ar->tx_status[i].lock);299 }300 301 BUILD_BUG_ON(CARL9170_NUM_TX_LIMIT_SOFT < 1);302 BUILD_BUG_ON(CARL9170_NUM_TX_LIMIT_HARD < CARL9170_NUM_TX_LIMIT_SOFT);303 BUILD_BUG_ON(CARL9170_NUM_TX_LIMIT_HARD >= CARL9170_BAW_BITS);304 305 /* reinitialize queues statistics */306 memset(&ar->tx_stats, 0, sizeof(ar->tx_stats));307 for (i = 0; i < ar->hw->queues; i++)308 ar->tx_stats[i].limit = CARL9170_NUM_TX_LIMIT_HARD;309 310 bitmap_zero(ar->mem_bitmap, ar->fw.mem_blocks);311 312 rcu_read_lock();313 list_for_each_entry_rcu(cvif, &ar->vif_list, list) {314 spin_lock_bh(&ar->beacon_lock);315 dev_kfree_skb_any(cvif->beacon);316 cvif->beacon = NULL;317 spin_unlock_bh(&ar->beacon_lock);318 }319 rcu_read_unlock();320 321 atomic_set(&ar->tx_ampdu_upload, 0);322 atomic_set(&ar->tx_ampdu_scheduler, 0);323 atomic_set(&ar->tx_total_pending, 0);324 atomic_set(&ar->tx_total_queued, 0);325 atomic_set(&ar->mem_free_blocks, ar->fw.mem_blocks);326}327 328#define CARL9170_FILL_QUEUE(queue, ai_fs, cwmin, cwmax, _txop) \329do { \330 queue.aifs = ai_fs; \331 queue.cw_min = cwmin; \332 queue.cw_max = cwmax; \333 queue.txop = _txop; \334} while (0)335 336static int carl9170_op_start(struct ieee80211_hw *hw)337{338 struct ar9170 *ar = hw->priv;339 int err, i;340 341 mutex_lock(&ar->mutex);342 343 carl9170_zap_queues(ar);344 345 /* reset QoS defaults */346 CARL9170_FILL_QUEUE(ar->edcf[AR9170_TXQ_VO], 2, 3, 7, 47);347 CARL9170_FILL_QUEUE(ar->edcf[AR9170_TXQ_VI], 2, 7, 15, 94);348 CARL9170_FILL_QUEUE(ar->edcf[AR9170_TXQ_BE], 3, 15, 1023, 0);349 CARL9170_FILL_QUEUE(ar->edcf[AR9170_TXQ_BK], 7, 15, 1023, 0);350 CARL9170_FILL_QUEUE(ar->edcf[AR9170_TXQ_SPECIAL], 2, 3, 7, 0);351 352 ar->current_factor = ar->current_density = -1;353 /* "The first key is unique." */354 ar->usedkeys = 1;355 ar->filter_state = 0;356 ar->ps.last_action = jiffies;357 ar->ps.last_slept = jiffies;358 ar->erp_mode = CARL9170_ERP_AUTO;359 360 /* Set "disable hw crypto offload" whenever the module parameter361 * nohwcrypt is true or if the firmware does not support it.362 */363 ar->disable_offload = modparam_nohwcrypt |364 ar->fw.disable_offload_fw;365 ar->rx_software_decryption = ar->disable_offload;366 367 for (i = 0; i < ar->hw->queues; i++) {368 ar->queue_stop_timeout[i] = jiffies;369 ar->max_queue_stop_timeout[i] = 0;370 }371 372 atomic_set(&ar->mem_allocs, 0);373 374 err = carl9170_usb_open(ar);375 if (err)376 goto out;377 378 err = carl9170_init_mac(ar);379 if (err)380 goto out;381 382 err = carl9170_set_qos(ar);383 if (err)384 goto out;385 386 if (ar->fw.rx_filter) {387 err = carl9170_rx_filter(ar, CARL9170_RX_FILTER_OTHER_RA |388 CARL9170_RX_FILTER_CTL_OTHER | CARL9170_RX_FILTER_BAD);389 if (err)390 goto out;391 }392 393 err = carl9170_write_reg(ar, AR9170_MAC_REG_DMA_TRIGGER,394 AR9170_DMA_TRIGGER_RXQ);395 if (err)396 goto out;397 398 /* Clear key-cache */399 for (i = 0; i < AR9170_CAM_MAX_USER + 4; i++) {400 err = carl9170_upload_key(ar, i, NULL, AR9170_ENC_ALG_NONE,401 0, NULL, 0);402 if (err)403 goto out;404 405 err = carl9170_upload_key(ar, i, NULL, AR9170_ENC_ALG_NONE,406 1, NULL, 0);407 if (err)408 goto out;409 410 if (i < AR9170_CAM_MAX_USER) {411 err = carl9170_disable_key(ar, i);412 if (err)413 goto out;414 }415 }416 417 carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STARTED);418 419 ieee80211_queue_delayed_work(ar->hw, &ar->stat_work,420 round_jiffies(msecs_to_jiffies(CARL9170_STAT_WORK)));421 422 ieee80211_wake_queues(ar->hw);423 err = 0;424 425out:426 mutex_unlock(&ar->mutex);427 return err;428}429 430static void carl9170_cancel_worker(struct ar9170 *ar)431{432 cancel_delayed_work_sync(&ar->stat_work);433 cancel_delayed_work_sync(&ar->tx_janitor);434#ifdef CONFIG_CARL9170_LEDS435 cancel_delayed_work_sync(&ar->led_work);436#endif /* CONFIG_CARL9170_LEDS */437 cancel_work_sync(&ar->ps_work);438 cancel_work_sync(&ar->ping_work);439 cancel_work_sync(&ar->ampdu_work);440}441 442static void carl9170_op_stop(struct ieee80211_hw *hw, bool suspend)443{444 struct ar9170 *ar = hw->priv;445 446 carl9170_set_state_when(ar, CARL9170_STARTED, CARL9170_IDLE);447 448 ieee80211_stop_queues(ar->hw);449 450 mutex_lock(&ar->mutex);451 if (IS_ACCEPTING_CMD(ar)) {452 RCU_INIT_POINTER(ar->beacon_iter, NULL);453 454 carl9170_led_set_state(ar, 0);455 456 /* stop DMA */457 carl9170_write_reg(ar, AR9170_MAC_REG_DMA_TRIGGER, 0);458 carl9170_usb_stop(ar);459 }460 461 carl9170_zap_queues(ar);462 mutex_unlock(&ar->mutex);463 464 carl9170_cancel_worker(ar);465}466 467static void carl9170_restart_work(struct work_struct *work)468{469 struct ar9170 *ar = container_of(work, struct ar9170,470 restart_work);471 int err = -EIO;472 473 ar->usedkeys = 0;474 ar->filter_state = 0;475 carl9170_cancel_worker(ar);476 477 mutex_lock(&ar->mutex);478 if (!ar->force_usb_reset) {479 err = carl9170_usb_restart(ar);480 if (net_ratelimit()) {481 if (err)482 dev_err(&ar->udev->dev, "Failed to restart device (%d).\n", err);483 else484 dev_info(&ar->udev->dev, "device restarted successfully.\n");485 }486 }487 carl9170_zap_queues(ar);488 mutex_unlock(&ar->mutex);489 490 if (!err && !ar->force_usb_reset) {491 ar->restart_counter++;492 atomic_set(&ar->pending_restarts, 0);493 494 ieee80211_restart_hw(ar->hw);495 } else {496 /*497 * The reset was unsuccessful and the device seems to498 * be dead. But there's still one option: a low-level499 * usb subsystem reset...500 */501 502 carl9170_usb_reset(ar);503 }504}505 506void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r)507{508 carl9170_set_state_when(ar, CARL9170_STARTED, CARL9170_IDLE);509 510 /*511 * Sometimes, an error can trigger several different reset events.512 * By ignoring these *surplus* reset events, the device won't be513 * killed again, right after it has recovered.514 */515 if (atomic_inc_return(&ar->pending_restarts) > 1) {516 dev_dbg(&ar->udev->dev, "ignoring restart (%d)\n", r);517 return;518 }519 520 ieee80211_stop_queues(ar->hw);521 522 dev_err(&ar->udev->dev, "restart device (%d)\n", r);523 524 if (!WARN_ON(r == CARL9170_RR_NO_REASON) ||525 !WARN_ON(r >= __CARL9170_RR_LAST))526 ar->last_reason = r;527 528 if (!ar->registered)529 return;530 531 if (!IS_ACCEPTING_CMD(ar) || ar->needs_full_reset)532 ar->force_usb_reset = true;533 534 ieee80211_queue_work(ar->hw, &ar->restart_work);535 536 /*537 * At this point, the device instance might have vanished/disabled.538 * So, don't put any code which access the ar9170 struct539 * without proper protection.540 */541}542 543static void carl9170_ping_work(struct work_struct *work)544{545 struct ar9170 *ar = container_of(work, struct ar9170, ping_work);546 int err;547 548 if (!IS_STARTED(ar))549 return;550 551 mutex_lock(&ar->mutex);552 err = carl9170_echo_test(ar, 0xdeadbeef);553 if (err)554 carl9170_restart(ar, CARL9170_RR_UNRESPONSIVE_DEVICE);555 mutex_unlock(&ar->mutex);556}557 558static int carl9170_init_interface(struct ar9170 *ar,559 struct ieee80211_vif *vif)560{561 struct ath_common *common = &ar->common;562 int err;563 564 if (!vif) {565 WARN_ON_ONCE(IS_STARTED(ar));566 return 0;567 }568 569 memcpy(common->macaddr, vif->addr, ETH_ALEN);570 571 /* We have to fall back to software crypto, whenever572 * the user choose to participates in an IBSS. HW573 * offload for IBSS RSN is not supported by this driver.574 *575 * NOTE: If the previous main interface has already576 * disabled hw crypto offload, we have to keep this577 * previous disable_offload setting as it was.578 * Altough ideally, we should notify mac80211 and tell579 * it to forget about any HW crypto offload for now.580 */581 ar->disable_offload |= ((vif->type != NL80211_IFTYPE_STATION) &&582 (vif->type != NL80211_IFTYPE_AP));583 584 /* The driver used to have P2P GO+CLIENT support,585 * but since this was dropped and we don't know if586 * there are any gremlins lurking in the shadows,587 * so best we keep HW offload disabled for P2P.588 */589 ar->disable_offload |= vif->p2p;590 591 ar->rx_software_decryption = ar->disable_offload;592 593 err = carl9170_set_operating_mode(ar);594 return err;595}596 597static int carl9170_op_add_interface(struct ieee80211_hw *hw,598 struct ieee80211_vif *vif)599{600 struct carl9170_vif_info *vif_priv = (void *) vif->drv_priv;601 struct ieee80211_vif *main_vif, *old_main = NULL;602 struct ar9170 *ar = hw->priv;603 int vif_id = -1, err = 0;604 605 mutex_lock(&ar->mutex);606 rcu_read_lock();607 if (vif_priv->active) {608 /*609 * Skip the interface structure initialization,610 * if the vif survived the _restart call.611 */612 vif_id = vif_priv->id;613 vif_priv->enable_beacon = false;614 615 spin_lock_bh(&ar->beacon_lock);616 dev_kfree_skb_any(vif_priv->beacon);617 vif_priv->beacon = NULL;618 spin_unlock_bh(&ar->beacon_lock);619 620 goto init;621 }622 623 /* Because the AR9170 HW's MAC doesn't provide full support for624 * multiple, independent interfaces [of different operation modes].625 * We have to select ONE main interface [main mode of HW], but we626 * can have multiple slaves [AKA: entry in the ACK-table].627 *628 * The first (from HEAD/TOP) interface in the ar->vif_list is629 * always the main intf. All following intfs in this list630 * are considered to be slave intfs.631 */632 main_vif = carl9170_get_main_vif(ar);633 634 if (main_vif) {635 switch (main_vif->type) {636 case NL80211_IFTYPE_STATION:637 if (vif->type == NL80211_IFTYPE_STATION)638 break;639 640 err = -EBUSY;641 rcu_read_unlock();642 643 goto unlock;644 645 case NL80211_IFTYPE_MESH_POINT:646 case NL80211_IFTYPE_AP:647 if ((vif->type == NL80211_IFTYPE_STATION) ||648 (vif->type == NL80211_IFTYPE_AP) ||649 (vif->type == NL80211_IFTYPE_MESH_POINT))650 break;651 652 err = -EBUSY;653 rcu_read_unlock();654 goto unlock;655 656 default:657 rcu_read_unlock();658 goto unlock;659 }660 }661 662 vif_id = bitmap_find_free_region(&ar->vif_bitmap, ar->fw.vif_num, 0);663 664 if (vif_id < 0) {665 rcu_read_unlock();666 667 err = -ENOSPC;668 goto unlock;669 }670 671 BUG_ON(ar->vif_priv[vif_id].id != vif_id);672 673 vif_priv->active = true;674 vif_priv->id = vif_id;675 vif_priv->enable_beacon = false;676 ar->vifs++;677 if (old_main) {678 /* We end up in here, if the main interface is being replaced.679 * Put the new main interface at the HEAD of the list and the680 * previous inteface will automatically become second in line.681 */682 list_add_rcu(&vif_priv->list, &ar->vif_list);683 } else {684 /* Add new inteface. If the list is empty, it will become the685 * main inteface, otherwise it will be slave.686 */687 list_add_tail_rcu(&vif_priv->list, &ar->vif_list);688 }689 rcu_assign_pointer(ar->vif_priv[vif_id].vif, vif);690 691init:692 main_vif = carl9170_get_main_vif(ar);693 694 if (main_vif == vif) {695 rcu_assign_pointer(ar->beacon_iter, vif_priv);696 rcu_read_unlock();697 698 if (old_main) {699 struct carl9170_vif_info *old_main_priv =700 (void *) old_main->drv_priv;701 /* downgrade old main intf to slave intf.702 * NOTE: We are no longer under rcu_read_lock.703 * But we are still holding ar->mutex, so the704 * vif data [id, addr] is safe.705 */706 err = carl9170_mod_virtual_mac(ar, old_main_priv->id,707 old_main->addr);708 if (err)709 goto unlock;710 }711 712 err = carl9170_init_interface(ar, vif);713 if (err)714 goto unlock;715 } else {716 rcu_read_unlock();717 err = carl9170_mod_virtual_mac(ar, vif_id, vif->addr);718 719 if (err)720 goto unlock;721 }722 723 if (ar->fw.tx_seq_table) {724 err = carl9170_write_reg(ar, ar->fw.tx_seq_table + vif_id * 4,725 0);726 if (err)727 goto unlock;728 }729 730unlock:731 if (err && (vif_id >= 0)) {732 vif_priv->active = false;733 bitmap_release_region(&ar->vif_bitmap, vif_id, 0);734 ar->vifs--;735 RCU_INIT_POINTER(ar->vif_priv[vif_id].vif, NULL);736 list_del_rcu(&vif_priv->list);737 mutex_unlock(&ar->mutex);738 synchronize_rcu();739 } else {740 if (ar->vifs > 1)741 ar->ps.off_override |= PS_OFF_VIF;742 743 mutex_unlock(&ar->mutex);744 }745 746 return err;747}748 749static void carl9170_op_remove_interface(struct ieee80211_hw *hw,750 struct ieee80211_vif *vif)751{752 struct carl9170_vif_info *vif_priv = (void *) vif->drv_priv;753 struct ieee80211_vif *main_vif;754 struct ar9170 *ar = hw->priv;755 unsigned int id;756 757 mutex_lock(&ar->mutex);758 759 if (WARN_ON_ONCE(!vif_priv->active))760 goto unlock;761 762 ar->vifs--;763 764 rcu_read_lock();765 main_vif = carl9170_get_main_vif(ar);766 767 id = vif_priv->id;768 769 vif_priv->active = false;770 WARN_ON(vif_priv->enable_beacon);771 vif_priv->enable_beacon = false;772 list_del_rcu(&vif_priv->list);773 RCU_INIT_POINTER(ar->vif_priv[id].vif, NULL);774 775 if (vif == main_vif) {776 rcu_read_unlock();777 778 if (ar->vifs) {779 WARN_ON(carl9170_init_interface(ar,780 carl9170_get_main_vif(ar)));781 } else {782 carl9170_set_operating_mode(ar);783 }784 } else {785 rcu_read_unlock();786 787 WARN_ON(carl9170_mod_virtual_mac(ar, id, NULL));788 }789 790 carl9170_update_beacon(ar, false);791 carl9170_flush_cab(ar, id);792 793 spin_lock_bh(&ar->beacon_lock);794 dev_kfree_skb_any(vif_priv->beacon);795 vif_priv->beacon = NULL;796 spin_unlock_bh(&ar->beacon_lock);797 798 bitmap_release_region(&ar->vif_bitmap, id, 0);799 800 carl9170_set_beacon_timers(ar);801 802 if (ar->vifs == 1)803 ar->ps.off_override &= ~PS_OFF_VIF;804 805unlock:806 mutex_unlock(&ar->mutex);807 808 synchronize_rcu();809}810 811void carl9170_ps_check(struct ar9170 *ar)812{813 ieee80211_queue_work(ar->hw, &ar->ps_work);814}815 816/* caller must hold ar->mutex */817static int carl9170_ps_update(struct ar9170 *ar)818{819 bool ps = false;820 int err = 0;821 822 if (!ar->ps.off_override)823 ps = (ar->hw->conf.flags & IEEE80211_CONF_PS);824 825 if (ps != ar->ps.state) {826 err = carl9170_powersave(ar, ps);827 if (err)828 return err;829 830 if (ar->ps.state && !ps) {831 ar->ps.sleep_ms = jiffies_to_msecs(jiffies -832 ar->ps.last_action);833 }834 835 if (ps)836 ar->ps.last_slept = jiffies;837 838 ar->ps.last_action = jiffies;839 ar->ps.state = ps;840 }841 842 return 0;843}844 845static void carl9170_ps_work(struct work_struct *work)846{847 struct ar9170 *ar = container_of(work, struct ar9170,848 ps_work);849 mutex_lock(&ar->mutex);850 if (IS_STARTED(ar))851 WARN_ON_ONCE(carl9170_ps_update(ar) != 0);852 mutex_unlock(&ar->mutex);853}854 855static int carl9170_update_survey(struct ar9170 *ar, bool flush, bool noise)856{857 int err;858 859 if (noise) {860 err = carl9170_get_noisefloor(ar);861 if (err)862 return err;863 }864 865 if (ar->fw.hw_counters) {866 err = carl9170_collect_tally(ar);867 if (err)868 return err;869 }870 871 if (flush)872 memset(&ar->tally, 0, sizeof(ar->tally));873 874 return 0;875}876 877static void carl9170_stat_work(struct work_struct *work)878{879 struct ar9170 *ar = container_of(work, struct ar9170, stat_work.work);880 int err;881 882 mutex_lock(&ar->mutex);883 err = carl9170_update_survey(ar, false, true);884 mutex_unlock(&ar->mutex);885 886 if (err)887 return;888 889 ieee80211_queue_delayed_work(ar->hw, &ar->stat_work,890 round_jiffies(msecs_to_jiffies(CARL9170_STAT_WORK)));891}892 893static int carl9170_op_config(struct ieee80211_hw *hw, u32 changed)894{895 struct ar9170 *ar = hw->priv;896 int err = 0;897 898 mutex_lock(&ar->mutex);899 if (changed & IEEE80211_CONF_CHANGE_LISTEN_INTERVAL) {900 /* TODO */901 err = 0;902 }903 904 if (changed & IEEE80211_CONF_CHANGE_PS) {905 err = carl9170_ps_update(ar);906 if (err)907 goto out;908 }909 910 if (changed & IEEE80211_CONF_CHANGE_SMPS) {911 /* TODO */912 err = 0;913 }914 915 if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {916 enum nl80211_channel_type channel_type =917 cfg80211_get_chandef_type(&hw->conf.chandef);918 919 /* adjust slot time for 5 GHz */920 err = carl9170_set_slot_time(ar);921 if (err)922 goto out;923 924 err = carl9170_update_survey(ar, true, false);925 if (err)926 goto out;927 928 err = carl9170_set_channel(ar, hw->conf.chandef.chan,929 channel_type);930 if (err)931 goto out;932 933 err = carl9170_update_survey(ar, false, true);934 if (err)935 goto out;936 937 err = carl9170_set_dyn_sifs_ack(ar);938 if (err)939 goto out;940 941 err = carl9170_set_rts_cts_rate(ar);942 if (err)943 goto out;944 }945 946 if (changed & IEEE80211_CONF_CHANGE_POWER) {947 err = carl9170_set_mac_tpc(ar, ar->hw->conf.chandef.chan);948 if (err)949 goto out;950 }951 952out:953 mutex_unlock(&ar->mutex);954 return err;955}956 957static u64 carl9170_op_prepare_multicast(struct ieee80211_hw *hw,958 struct netdev_hw_addr_list *mc_list)959{960 struct netdev_hw_addr *ha;961 u64 mchash;962 963 /* always get broadcast frames */964 mchash = 1ULL << (0xff >> 2);965 966 netdev_hw_addr_list_for_each(ha, mc_list)967 mchash |= 1ULL << (ha->addr[5] >> 2);968 969 return mchash;970}971 972static void carl9170_op_configure_filter(struct ieee80211_hw *hw,973 unsigned int changed_flags,974 unsigned int *new_flags,975 u64 multicast)976{977 struct ar9170 *ar = hw->priv;978 979 /* mask supported flags */980 *new_flags &= FIF_ALLMULTI | ar->rx_filter_caps;981 982 if (!IS_ACCEPTING_CMD(ar))983 return;984 985 mutex_lock(&ar->mutex);986 987 ar->filter_state = *new_flags;988 /*989 * We can support more by setting the sniffer bit and990 * then checking the error flags, later.991 */992 993 if (*new_flags & FIF_ALLMULTI)994 multicast = ~0ULL;995 996 if (multicast != ar->cur_mc_hash)997 WARN_ON(carl9170_update_multicast(ar, multicast));998 999 if (changed_flags & FIF_OTHER_BSS) {1000 ar->sniffer_enabled = !!(*new_flags & FIF_OTHER_BSS);1001 1002 WARN_ON(carl9170_set_operating_mode(ar));1003 }1004 1005 if (ar->fw.rx_filter && changed_flags & ar->rx_filter_caps) {1006 u32 rx_filter = 0;1007 1008 if (!ar->fw.ba_filter)1009 rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;1010 1011 if (!(*new_flags & (FIF_FCSFAIL | FIF_PLCPFAIL)))1012 rx_filter |= CARL9170_RX_FILTER_BAD;1013 1014 if (!(*new_flags & FIF_CONTROL))1015 rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;1016 1017 if (!(*new_flags & FIF_PSPOLL))1018 rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;1019 1020 if (!(*new_flags & FIF_OTHER_BSS)) {1021 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;1022 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;1023 }1024 1025 WARN_ON(carl9170_rx_filter(ar, rx_filter));1026 }1027 1028 mutex_unlock(&ar->mutex);1029}1030 1031 1032static void carl9170_op_bss_info_changed(struct ieee80211_hw *hw,1033 struct ieee80211_vif *vif,1034 struct ieee80211_bss_conf *bss_conf,1035 u64 changed)1036{1037 struct ar9170 *ar = hw->priv;1038 struct ath_common *common = &ar->common;1039 int err = 0;1040 struct carl9170_vif_info *vif_priv;1041 struct ieee80211_vif *main_vif;1042 1043 mutex_lock(&ar->mutex);1044 vif_priv = (void *) vif->drv_priv;1045 main_vif = carl9170_get_main_vif(ar);1046 if (WARN_ON(!main_vif))1047 goto out;1048 1049 if (changed & BSS_CHANGED_BEACON_ENABLED) {1050 struct carl9170_vif_info *iter;1051 int i = 0;1052 1053 vif_priv->enable_beacon = bss_conf->enable_beacon;1054 rcu_read_lock();1055 list_for_each_entry_rcu(iter, &ar->vif_list, list) {1056 if (iter->active && iter->enable_beacon)1057 i++;1058 1059 }1060 rcu_read_unlock();1061 1062 ar->beacon_enabled = i;1063 }1064 1065 if (changed & BSS_CHANGED_BEACON) {1066 err = carl9170_update_beacon(ar, false);1067 if (err)1068 goto out;1069 }1070 1071 if (changed & (BSS_CHANGED_BEACON_ENABLED | BSS_CHANGED_BEACON |1072 BSS_CHANGED_BEACON_INT)) {1073 1074 if (main_vif != vif) {1075 bss_conf->beacon_int = main_vif->bss_conf.beacon_int;1076 bss_conf->dtim_period = main_vif->bss_conf.dtim_period;1077 }1078 1079 /*1080 * Therefore a hard limit for the broadcast traffic should1081 * prevent false alarms.1082 */1083 if (vif->type != NL80211_IFTYPE_STATION &&1084 (bss_conf->beacon_int * bss_conf->dtim_period >=1085 (CARL9170_QUEUE_STUCK_TIMEOUT / 2))) {1086 err = -EINVAL;1087 goto out;1088 }1089 1090 err = carl9170_set_beacon_timers(ar);1091 if (err)1092 goto out;1093 }1094 1095 if (changed & BSS_CHANGED_HT) {1096 /* TODO */1097 err = 0;1098 if (err)1099 goto out;1100 }1101 1102 if (main_vif != vif)1103 goto out;1104 1105 /*1106 * The following settings can only be changed by the1107 * master interface.1108 */1109 1110 if (changed & BSS_CHANGED_BSSID) {1111 memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);1112 err = carl9170_set_operating_mode(ar);1113 if (err)1114 goto out;1115 }1116 1117 if (changed & BSS_CHANGED_ASSOC) {1118 ar->common.curaid = vif->cfg.aid;1119 err = carl9170_set_beacon_timers(ar);1120 if (err)1121 goto out;1122 }1123 1124 if (changed & BSS_CHANGED_ERP_SLOT) {1125 err = carl9170_set_slot_time(ar);1126 if (err)1127 goto out;1128 }1129 1130 if (changed & BSS_CHANGED_BASIC_RATES) {1131 err = carl9170_set_mac_rates(ar);1132 if (err)1133 goto out;1134 }1135 1136out:1137 WARN_ON_ONCE(err && IS_STARTED(ar));1138 mutex_unlock(&ar->mutex);1139}1140 1141static u64 carl9170_op_get_tsf(struct ieee80211_hw *hw,1142 struct ieee80211_vif *vif)1143{1144 struct ar9170 *ar = hw->priv;1145 struct carl9170_tsf_rsp tsf;1146 int err;1147 1148 mutex_lock(&ar->mutex);1149 err = carl9170_exec_cmd(ar, CARL9170_CMD_READ_TSF,1150 0, NULL, sizeof(tsf), &tsf);1151 mutex_unlock(&ar->mutex);1152 if (WARN_ON(err))1153 return 0;1154 1155 return le64_to_cpu(tsf.tsf_64);1156}1157 1158static int carl9170_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,1159 struct ieee80211_vif *vif,1160 struct ieee80211_sta *sta,1161 struct ieee80211_key_conf *key)1162{1163 struct ar9170 *ar = hw->priv;1164 int err = 0, i;1165 u8 ktype;1166 1167 if (ar->disable_offload || !vif)1168 return -EOPNOTSUPP;1169 1170 /* Fall back to software encryption whenever the driver is connected1171 * to more than one network.1172 *1173 * This is very unfortunate, because some machines cannot handle1174 * the high througput speed in 802.11n networks.1175 */1176 1177 if (!is_main_vif(ar, vif)) {1178 mutex_lock(&ar->mutex);1179 goto err_softw;1180 }1181 1182 /*1183 * While the hardware supports *catch-all* key, for offloading1184 * group-key en-/de-cryption. The way of how the hardware1185 * decides which keyId maps to which key, remains a mystery...1186 */1187 if ((vif->type != NL80211_IFTYPE_STATION &&1188 vif->type != NL80211_IFTYPE_ADHOC) &&1189 !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))1190 return -EOPNOTSUPP;1191 1192 switch (key->cipher) {1193 case WLAN_CIPHER_SUITE_WEP40:1194 ktype = AR9170_ENC_ALG_WEP64;1195 break;1196 case WLAN_CIPHER_SUITE_WEP104:1197 ktype = AR9170_ENC_ALG_WEP128;1198 break;1199 case WLAN_CIPHER_SUITE_TKIP:1200 ktype = AR9170_ENC_ALG_TKIP;1201 break;1202 case WLAN_CIPHER_SUITE_CCMP:1203 ktype = AR9170_ENC_ALG_AESCCMP;1204 key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;1205 break;1206 default:1207 return -EOPNOTSUPP;1208 }1209 1210 mutex_lock(&ar->mutex);1211 if (cmd == SET_KEY) {1212 if (!IS_STARTED(ar)) {1213 err = -EOPNOTSUPP;1214 goto out;1215 }1216 1217 if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {1218 sta = NULL;1219 1220 i = 64 + key->keyidx;1221 } else {1222 for (i = 0; i < 64; i++)1223 if (!(ar->usedkeys & BIT(i)))1224 break;1225 if (i == 64)1226 goto err_softw;1227 }1228 1229 key->hw_key_idx = i;1230 1231 err = carl9170_upload_key(ar, i, sta ? sta->addr : NULL,1232 ktype, 0, key->key,1233 min_t(u8, 16, key->keylen));1234 if (err)1235 goto out;1236 1237 if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {1238 err = carl9170_upload_key(ar, i, sta ? sta->addr :1239 NULL, ktype, 1,1240 key->key + 16, 16);1241 if (err)1242 goto out;1243 1244 /*1245 * hardware is not capable generating MMIC1246 * of fragmented frames!1247 */1248 key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;1249 }1250 1251 if (i < 64)1252 ar->usedkeys |= BIT(i);1253 1254 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;1255 } else {1256 if (!IS_STARTED(ar)) {1257 /* The device is gone... together with the key ;-) */1258 err = 0;1259 goto out;1260 }1261 1262 if (key->hw_key_idx < 64) {1263 ar->usedkeys &= ~BIT(key->hw_key_idx);1264 } else {1265 err = carl9170_upload_key(ar, key->hw_key_idx, NULL,1266 AR9170_ENC_ALG_NONE, 0,1267 NULL, 0);1268 if (err)1269 goto out;1270 1271 if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {1272 err = carl9170_upload_key(ar, key->hw_key_idx,1273 NULL,1274 AR9170_ENC_ALG_NONE,1275 1, NULL, 0);1276 if (err)1277 goto out;1278 }1279 1280 }1281 1282 err = carl9170_disable_key(ar, key->hw_key_idx);1283 if (err)1284 goto out;1285 }1286 1287out:1288 mutex_unlock(&ar->mutex);1289 return err;1290 1291err_softw:1292 if (!ar->rx_software_decryption) {1293 ar->rx_software_decryption = true;1294 carl9170_set_operating_mode(ar);1295 }1296 mutex_unlock(&ar->mutex);1297 return -ENOSPC;1298}1299 1300static int carl9170_op_sta_add(struct ieee80211_hw *hw,1301 struct ieee80211_vif *vif,1302 struct ieee80211_sta *sta)1303{1304 struct carl9170_sta_info *sta_info = (void *) sta->drv_priv;1305 unsigned int i;1306 1307 atomic_set(&sta_info->pending_frames, 0);1308 1309 if (sta->deflink.ht_cap.ht_supported) {1310 if (sta->deflink.ht_cap.ampdu_density > 6) {1311 /*1312 * HW does support 16us AMPDU density.1313 * No HT-Xmit for station.1314 */1315 1316 return 0;1317 }1318 1319 for (i = 0; i < ARRAY_SIZE(sta_info->agg); i++)1320 RCU_INIT_POINTER(sta_info->agg[i], NULL);1321 1322 sta_info->ampdu_max_len = 1 << (3 + sta->deflink.ht_cap.ampdu_factor);1323 sta_info->ht_sta = true;1324 }1325 1326 return 0;1327}1328 1329static int carl9170_op_sta_remove(struct ieee80211_hw *hw,1330 struct ieee80211_vif *vif,1331 struct ieee80211_sta *sta)1332{1333 struct ar9170 *ar = hw->priv;1334 struct carl9170_sta_info *sta_info = (void *) sta->drv_priv;1335 unsigned int i;1336 bool cleanup = false;1337 1338 if (sta->deflink.ht_cap.ht_supported) {1339 1340 sta_info->ht_sta = false;1341 1342 rcu_read_lock();1343 for (i = 0; i < ARRAY_SIZE(sta_info->agg); i++) {1344 struct carl9170_sta_tid *tid_info;1345 1346 tid_info = rcu_dereference(sta_info->agg[i]);1347 RCU_INIT_POINTER(sta_info->agg[i], NULL);1348 1349 if (!tid_info)1350 continue;1351 1352 spin_lock_bh(&ar->tx_ampdu_list_lock);1353 if (tid_info->state > CARL9170_TID_STATE_SHUTDOWN)1354 tid_info->state = CARL9170_TID_STATE_SHUTDOWN;1355 spin_unlock_bh(&ar->tx_ampdu_list_lock);1356 cleanup = true;1357 }1358 rcu_read_unlock();1359 1360 if (cleanup)1361 carl9170_ampdu_gc(ar);1362 }1363 1364 return 0;1365}1366 1367static int carl9170_op_conf_tx(struct ieee80211_hw *hw,1368 struct ieee80211_vif *vif,1369 unsigned int link_id, u16 queue,1370 const struct ieee80211_tx_queue_params *param)1371{1372 struct ar9170 *ar = hw->priv;1373 int ret;1374 1375 mutex_lock(&ar->mutex);1376 memcpy(&ar->edcf[ar9170_qmap(queue)], param, sizeof(*param));1377 ret = carl9170_set_qos(ar);1378 mutex_unlock(&ar->mutex);1379 return ret;1380}1381 1382static void carl9170_ampdu_work(struct work_struct *work)1383{1384 struct ar9170 *ar = container_of(work, struct ar9170,1385 ampdu_work);1386 1387 if (!IS_STARTED(ar))1388 return;1389 1390 mutex_lock(&ar->mutex);1391 carl9170_ampdu_gc(ar);1392 mutex_unlock(&ar->mutex);1393}1394 1395static int carl9170_op_ampdu_action(struct ieee80211_hw *hw,1396 struct ieee80211_vif *vif,1397 struct ieee80211_ampdu_params *params)1398{1399 struct ieee80211_sta *sta = params->sta;1400 enum ieee80211_ampdu_mlme_action action = params->action;1401 u16 tid = params->tid;1402 u16 *ssn = ¶ms->ssn;1403 struct ar9170 *ar = hw->priv;1404 struct carl9170_sta_info *sta_info = (void *) sta->drv_priv;1405 struct carl9170_sta_tid *tid_info;1406 1407 if (modparam_noht)1408 return -EOPNOTSUPP;1409 1410 switch (action) {1411 case IEEE80211_AMPDU_TX_START:1412 if (!sta_info->ht_sta)1413 return -EOPNOTSUPP;1414 1415 tid_info = kzalloc(sizeof(struct carl9170_sta_tid),1416 GFP_KERNEL);1417 if (!tid_info)1418 return -ENOMEM;1419 1420 tid_info->hsn = tid_info->bsn = tid_info->snx = (*ssn);1421 tid_info->state = CARL9170_TID_STATE_PROGRESS;1422 tid_info->tid = tid;1423 tid_info->max = sta_info->ampdu_max_len;1424 tid_info->sta = sta;1425 tid_info->vif = vif;1426 1427 INIT_LIST_HEAD(&tid_info->list);1428 INIT_LIST_HEAD(&tid_info->tmp_list);1429 skb_queue_head_init(&tid_info->queue);1430 spin_lock_init(&tid_info->lock);1431 1432 spin_lock_bh(&ar->tx_ampdu_list_lock);1433 ar->tx_ampdu_list_len++;1434 list_add_tail_rcu(&tid_info->list, &ar->tx_ampdu_list);1435 rcu_assign_pointer(sta_info->agg[tid], tid_info);1436 spin_unlock_bh(&ar->tx_ampdu_list_lock);1437 1438 return IEEE80211_AMPDU_TX_START_IMMEDIATE;1439 1440 case IEEE80211_AMPDU_TX_STOP_CONT:1441 case IEEE80211_AMPDU_TX_STOP_FLUSH:1442 case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:1443 rcu_read_lock();1444 tid_info = rcu_dereference(sta_info->agg[tid]);1445 if (tid_info) {1446 spin_lock_bh(&ar->tx_ampdu_list_lock);1447 if (tid_info->state > CARL9170_TID_STATE_SHUTDOWN)1448 tid_info->state = CARL9170_TID_STATE_SHUTDOWN;1449 spin_unlock_bh(&ar->tx_ampdu_list_lock);1450 }1451 1452 RCU_INIT_POINTER(sta_info->agg[tid], NULL);1453 rcu_read_unlock();1454 1455 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);1456 ieee80211_queue_work(ar->hw, &ar->ampdu_work);1457 break;1458 1459 case IEEE80211_AMPDU_TX_OPERATIONAL:1460 rcu_read_lock();1461 tid_info = rcu_dereference(sta_info->agg[tid]);1462 1463 sta_info->stats[tid].clear = true;1464 sta_info->stats[tid].req = false;1465 1466 if (tid_info) {1467 bitmap_zero(tid_info->bitmap, CARL9170_BAW_SIZE);1468 tid_info->state = CARL9170_TID_STATE_IDLE;1469 }1470 rcu_read_unlock();1471 1472 if (WARN_ON_ONCE(!tid_info))1473 return -EFAULT;1474 1475 break;1476 1477 case IEEE80211_AMPDU_RX_START:1478 case IEEE80211_AMPDU_RX_STOP:1479 /* Handled by hardware */1480 break;1481 1482 default:1483 return -EOPNOTSUPP;1484 }1485 1486 return 0;1487}1488 1489#ifdef CONFIG_CARL9170_WPC1490static int carl9170_register_wps_button(struct ar9170 *ar)1491{1492 struct input_dev *input;1493 int err;1494 1495 if (!(ar->features & CARL9170_WPS_BUTTON))1496 return 0;1497 1498 input = devm_input_allocate_device(&ar->udev->dev);1499 if (!input)1500 return -ENOMEM;1501 1502 snprintf(ar->wps.name, sizeof(ar->wps.name), "%s WPS Button",1503 wiphy_name(ar->hw->wiphy));1504 1505 snprintf(ar->wps.phys, sizeof(ar->wps.phys),1506 "ieee80211/%s/input0", wiphy_name(ar->hw->wiphy));1507 1508 input->name = ar->wps.name;1509 input->phys = ar->wps.phys;1510 input->id.bustype = BUS_USB;1511 input->dev.parent = &ar->hw->wiphy->dev;1512 1513 input_set_capability(input, EV_KEY, KEY_WPS_BUTTON);1514 1515 err = input_register_device(input);1516 if (err)1517 return err;1518 1519 ar->wps.pbc = input;1520 return 0;1521}1522#endif /* CONFIG_CARL9170_WPC */1523 1524#ifdef CONFIG_CARL9170_HWRNG1525static int carl9170_rng_get(struct ar9170 *ar)1526{1527 1528#define RW (CARL9170_MAX_CMD_PAYLOAD_LEN / sizeof(u32))1529#define RB (CARL9170_MAX_CMD_PAYLOAD_LEN)1530 1531 static const __le32 rng_load[RW] = {1532 [0 ... (RW - 1)] = cpu_to_le32(AR9170_RAND_REG_NUM)};1533 1534 u32 buf[RW];1535 1536 unsigned int i, off = 0, transfer, count;1537 int err;1538 1539 BUILD_BUG_ON(RB > CARL9170_MAX_CMD_PAYLOAD_LEN);1540 1541 if (!IS_ACCEPTING_CMD(ar))1542 return -EAGAIN;1543 1544 count = ARRAY_SIZE(ar->rng.cache);1545 while (count) {1546 err = carl9170_exec_cmd(ar, CARL9170_CMD_RREG,1547 RB, (u8 *) rng_load,1548 RB, (u8 *) buf);1549 if (err)1550 return err;1551 1552 transfer = min_t(unsigned int, count, RW);1553 for (i = 0; i < transfer; i++)1554 ar->rng.cache[off + i] = buf[i];1555 1556 off += transfer;1557 count -= transfer;1558 }1559 1560 ar->rng.cache_idx = 0;1561 1562#undef RW1563#undef RB1564 return 0;1565}1566 1567static int carl9170_rng_read(struct hwrng *rng, u32 *data)1568{1569 struct ar9170 *ar = (struct ar9170 *)rng->priv;1570 int ret = -EIO;1571 1572 mutex_lock(&ar->mutex);1573 if (ar->rng.cache_idx >= ARRAY_SIZE(ar->rng.cache)) {1574 ret = carl9170_rng_get(ar);1575 if (ret) {1576 mutex_unlock(&ar->mutex);1577 return ret;1578 }1579 }1580 1581 *data = ar->rng.cache[ar->rng.cache_idx++];1582 mutex_unlock(&ar->mutex);1583 1584 return sizeof(u16);1585}1586 1587static int carl9170_register_hwrng(struct ar9170 *ar)1588{1589 int err;1590 1591 snprintf(ar->rng.name, ARRAY_SIZE(ar->rng.name),1592 "%s_%s", KBUILD_MODNAME, wiphy_name(ar->hw->wiphy));1593 ar->rng.rng.name = ar->rng.name;1594 ar->rng.rng.data_read = carl9170_rng_read;1595 ar->rng.rng.priv = (unsigned long)ar;1596 1597 err = devm_hwrng_register(&ar->udev->dev, &ar->rng.rng);1598 if (err) {1599 dev_err(&ar->udev->dev, "Failed to register the random "1600 "number generator (%d)\n", err);1601 return err;1602 }1603 1604 return carl9170_rng_get(ar);1605}1606#endif /* CONFIG_CARL9170_HWRNG */1607 1608static int carl9170_op_get_survey(struct ieee80211_hw *hw, int idx,1609 struct survey_info *survey)1610{1611 struct ar9170 *ar = hw->priv;1612 struct ieee80211_channel *chan;1613 struct ieee80211_supported_band *band;1614 int err, b, i;1615 1616 chan = ar->channel;1617 if (!chan)1618 return -ENODEV;1619 1620 if (idx == chan->hw_value) {1621 mutex_lock(&ar->mutex);1622 err = carl9170_update_survey(ar, false, true);1623 mutex_unlock(&ar->mutex);1624 if (err)1625 return err;1626 }1627 1628 for (b = 0; b < NUM_NL80211_BANDS; b++) {1629 band = ar->hw->wiphy->bands[b];1630 1631 if (!band)1632 continue;1633 1634 for (i = 0; i < band->n_channels; i++) {1635 if (band->channels[i].hw_value == idx) {1636 chan = &band->channels[i];1637 goto found;1638 }1639 }1640 }1641 return -ENOENT;1642 1643found:1644 memcpy(survey, &ar->survey[idx], sizeof(*survey));1645 1646 survey->channel = chan;1647 survey->filled = SURVEY_INFO_NOISE_DBM;1648 1649 if (ar->channel == chan)1650 survey->filled |= SURVEY_INFO_IN_USE;1651 1652 if (ar->fw.hw_counters) {1653 survey->filled |= SURVEY_INFO_TIME |1654 SURVEY_INFO_TIME_BUSY |1655 SURVEY_INFO_TIME_TX;1656 }1657 1658 return 0;1659}1660 1661static void carl9170_op_flush(struct ieee80211_hw *hw,1662 struct ieee80211_vif *vif,1663 u32 queues, bool drop)1664{1665 struct ar9170 *ar = hw->priv;1666 unsigned int vid;1667 1668 mutex_lock(&ar->mutex);1669 for_each_set_bit(vid, &ar->vif_bitmap, ar->fw.vif_num)1670 carl9170_flush_cab(ar, vid);1671 1672 carl9170_flush(ar, drop);1673 mutex_unlock(&ar->mutex);1674}1675 1676static int carl9170_op_get_stats(struct ieee80211_hw *hw,1677 struct ieee80211_low_level_stats *stats)1678{1679 struct ar9170 *ar = hw->priv;1680 1681 memset(stats, 0, sizeof(*stats));1682 stats->dot11ACKFailureCount = ar->tx_ack_failures;1683 stats->dot11FCSErrorCount = ar->tx_fcs_errors;1684 return 0;1685}1686 1687static void carl9170_op_sta_notify(struct ieee80211_hw *hw,1688 struct ieee80211_vif *vif,1689 enum sta_notify_cmd cmd,1690 struct ieee80211_sta *sta)1691{1692 struct carl9170_sta_info *sta_info = (void *) sta->drv_priv;1693 1694 switch (cmd) {1695 case STA_NOTIFY_SLEEP:1696 sta_info->sleeping = true;1697 if (atomic_read(&sta_info->pending_frames))1698 ieee80211_sta_block_awake(hw, sta, true);1699 break;1700 1701 case STA_NOTIFY_AWAKE:1702 sta_info->sleeping = false;1703 break;1704 }1705}1706 1707static bool carl9170_tx_frames_pending(struct ieee80211_hw *hw)1708{1709 struct ar9170 *ar = hw->priv;1710 1711 return !!atomic_read(&ar->tx_total_queued);1712}1713 1714static const struct ieee80211_ops carl9170_ops = {1715 .add_chanctx = ieee80211_emulate_add_chanctx,1716 .remove_chanctx = ieee80211_emulate_remove_chanctx,1717 .change_chanctx = ieee80211_emulate_change_chanctx,1718 .switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,1719 .start = carl9170_op_start,1720 .stop = carl9170_op_stop,1721 .tx = carl9170_op_tx,1722 .wake_tx_queue = ieee80211_handle_wake_tx_queue,1723 .flush = carl9170_op_flush,1724 .add_interface = carl9170_op_add_interface,1725 .remove_interface = carl9170_op_remove_interface,1726 .config = carl9170_op_config,1727 .prepare_multicast = carl9170_op_prepare_multicast,1728 .configure_filter = carl9170_op_configure_filter,1729 .conf_tx = carl9170_op_conf_tx,1730 .bss_info_changed = carl9170_op_bss_info_changed,1731 .get_tsf = carl9170_op_get_tsf,1732 .set_key = carl9170_op_set_key,1733 .sta_add = carl9170_op_sta_add,1734 .sta_remove = carl9170_op_sta_remove,1735 .sta_notify = carl9170_op_sta_notify,1736 .get_survey = carl9170_op_get_survey,1737 .get_stats = carl9170_op_get_stats,1738 .ampdu_action = carl9170_op_ampdu_action,1739 .tx_frames_pending = carl9170_tx_frames_pending,1740};1741 1742void *carl9170_alloc(size_t priv_size)1743{1744 struct ieee80211_hw *hw;1745 struct ar9170 *ar;1746 struct sk_buff *skb;1747 int i;1748 1749 /*1750 * this buffer is used for rx stream reconstruction.1751 * Under heavy load this device (or the transport layer?)1752 * tends to split the streams into separate rx descriptors.1753 */1754 1755 skb = __dev_alloc_skb(AR9170_RX_STREAM_MAX_SIZE, GFP_KERNEL);1756 if (!skb)1757 goto err_nomem;1758 1759 hw = ieee80211_alloc_hw(priv_size, &carl9170_ops);1760 if (!hw)1761 goto err_nomem;1762 1763 ar = hw->priv;1764 ar->hw = hw;1765 ar->rx_failover = skb;1766 1767 memset(&ar->rx_plcp, 0, sizeof(struct ar9170_rx_head));1768 ar->rx_has_plcp = false;1769 1770 /*1771 * Here's a hidden pitfall!1772 *1773 * All 4 AC queues work perfectly well under _legacy_ operation.1774 * However as soon as aggregation is enabled, the traffic flow1775 * gets very bumpy. Therefore we have to _switch_ to a1776 * software AC with a single HW queue.1777 */1778 hw->queues = __AR9170_NUM_TXQ;1779 1780 mutex_init(&ar->mutex);1781 spin_lock_init(&ar->beacon_lock);1782 spin_lock_init(&ar->cmd_lock);1783 spin_lock_init(&ar->tx_stats_lock);1784 spin_lock_init(&ar->tx_ampdu_list_lock);1785 spin_lock_init(&ar->mem_lock);1786 spin_lock_init(&ar->state_lock);1787 atomic_set(&ar->pending_restarts, 0);1788 ar->vifs = 0;1789 for (i = 0; i < ar->hw->queues; i++) {1790 skb_queue_head_init(&ar->tx_status[i]);1791 skb_queue_head_init(&ar->tx_pending[i]);1792 1793 INIT_LIST_HEAD(&ar->bar_list[i]);1794 spin_lock_init(&ar->bar_list_lock[i]);1795 }1796 INIT_WORK(&ar->ps_work, carl9170_ps_work);1797 INIT_WORK(&ar->ping_work, carl9170_ping_work);1798 INIT_WORK(&ar->restart_work, carl9170_restart_work);1799 INIT_WORK(&ar->ampdu_work, carl9170_ampdu_work);1800 INIT_DELAYED_WORK(&ar->stat_work, carl9170_stat_work);1801 INIT_DELAYED_WORK(&ar->tx_janitor, carl9170_tx_janitor);1802 INIT_LIST_HEAD(&ar->tx_ampdu_list);1803 rcu_assign_pointer(ar->tx_ampdu_iter,1804 (struct carl9170_sta_tid *) &ar->tx_ampdu_list);1805 1806 bitmap_zero(&ar->vif_bitmap, ar->fw.vif_num);1807 INIT_LIST_HEAD(&ar->vif_list);1808 init_completion(&ar->tx_flush);1809 1810 /* firmware decides which modes we support */1811 hw->wiphy->interface_modes = 0;1812 1813 ieee80211_hw_set(hw, RX_INCLUDES_FCS);1814 ieee80211_hw_set(hw, MFP_CAPABLE);1815 ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS);1816 ieee80211_hw_set(hw, SUPPORTS_PS);1817 ieee80211_hw_set(hw, PS_NULLFUNC_STACK);1818 ieee80211_hw_set(hw, NEED_DTIM_BEFORE_ASSOC);1819 ieee80211_hw_set(hw, SUPPORTS_RC_TABLE);1820 ieee80211_hw_set(hw, SIGNAL_DBM);1821 ieee80211_hw_set(hw, SUPPORTS_HT_CCK_RATES);1822 1823 if (!modparam_noht) {1824 /*1825 * see the comment above, why we allow the user1826 * to disable HT by a module parameter.1827 */1828 ieee80211_hw_set(hw, AMPDU_AGGREGATION);1829 }1830 1831 hw->extra_tx_headroom = sizeof(struct _carl9170_tx_superframe);1832 hw->sta_data_size = sizeof(struct carl9170_sta_info);1833 hw->vif_data_size = sizeof(struct carl9170_vif_info);1834 1835 hw->max_rates = CARL9170_TX_MAX_RATES;1836 hw->max_rate_tries = CARL9170_TX_USER_RATE_TRIES;1837 1838 for (i = 0; i < ARRAY_SIZE(ar->noise); i++)1839 ar->noise[i] = -95; /* ATH_DEFAULT_NOISE_FLOOR */1840 1841 wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);1842 1843 return ar;1844 1845err_nomem:1846 kfree_skb(skb);1847 return ERR_PTR(-ENOMEM);1848}1849 1850static int carl9170_read_eeprom(struct ar9170 *ar)1851{1852#define RW 8 /* number of words to read at once */1853#define RB (sizeof(u32) * RW)1854 u8 *eeprom = (void *)&ar->eeprom;1855 __le32 offsets[RW];1856 int i, j, err;1857 1858 BUILD_BUG_ON(sizeof(ar->eeprom) & 3);1859 1860 BUILD_BUG_ON(RB > CARL9170_MAX_CMD_LEN - 4);1861#ifndef __CHECKER__1862 /* don't want to handle trailing remains */1863 BUILD_BUG_ON(sizeof(ar->eeprom) % RB);1864#endif1865 1866 for (i = 0; i < sizeof(ar->eeprom) / RB; i++) {1867 for (j = 0; j < RW; j++)1868 offsets[j] = cpu_to_le32(AR9170_EEPROM_START +1869 RB * i + 4 * j);1870 1871 err = carl9170_exec_cmd(ar, CARL9170_CMD_RREG,1872 RB, (u8 *) &offsets,1873 RB, eeprom + RB * i);1874 if (err)1875 return err;1876 }1877 1878#undef RW1879#undef RB1880 return 0;1881}1882 1883static int carl9170_parse_eeprom(struct ar9170 *ar)1884{1885 struct ath_regulatory *regulatory = &ar->common.regulatory;1886 unsigned int rx_streams, tx_streams, tx_params = 0;1887 int bands = 0;1888 int chans = 0;1889 1890 if (ar->eeprom.length == cpu_to_le16(0xffff))1891 return -ENODATA;1892 1893 rx_streams = hweight8(ar->eeprom.rx_mask);1894 tx_streams = hweight8(ar->eeprom.tx_mask);1895 1896 if (rx_streams != tx_streams) {1897 tx_params = IEEE80211_HT_MCS_TX_RX_DIFF;1898 1899 WARN_ON(!(tx_streams >= 1 && tx_streams <=1900 IEEE80211_HT_MCS_TX_MAX_STREAMS));1901 1902 tx_params |= (tx_streams - 1) <<1903 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;1904 1905 carl9170_band_2GHz.ht_cap.mcs.tx_params |= tx_params;1906 carl9170_band_5GHz.ht_cap.mcs.tx_params |= tx_params;1907 }1908 1909 if (ar->eeprom.operating_flags & AR9170_OPFLAG_2GHZ) {1910 ar->hw->wiphy->bands[NL80211_BAND_2GHZ] =1911 &carl9170_band_2GHz;1912 chans += carl9170_band_2GHz.n_channels;1913 bands++;1914 }1915 if (ar->eeprom.operating_flags & AR9170_OPFLAG_5GHZ) {1916 ar->hw->wiphy->bands[NL80211_BAND_5GHZ] =1917 &carl9170_band_5GHz;1918 chans += carl9170_band_5GHz.n_channels;1919 bands++;1920 }1921 1922 if (!bands)1923 return -EINVAL;1924 1925 ar->survey = devm_kcalloc(&ar->udev->dev, chans,1926 sizeof(struct survey_info), GFP_KERNEL);1927 if (!ar->survey)1928 return -ENOMEM;1929 ar->num_channels = chans;1930 1931 regulatory->current_rd = le16_to_cpu(ar->eeprom.reg_domain[0]);1932 1933 /* second part of wiphy init */1934 SET_IEEE80211_PERM_ADDR(ar->hw, ar->eeprom.mac_address);1935 1936 return 0;1937}1938 1939static void carl9170_reg_notifier(struct wiphy *wiphy,1940 struct regulatory_request *request)1941{1942 struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);1943 struct ar9170 *ar = hw->priv;1944 1945 ath_reg_notifier_apply(wiphy, request, &ar->common.regulatory);1946}1947 1948int carl9170_register(struct ar9170 *ar)1949{1950 struct ath_regulatory *regulatory = &ar->common.regulatory;1951 int err = 0, i;1952 1953 ar->mem_bitmap = devm_bitmap_zalloc(&ar->udev->dev, ar->fw.mem_blocks, GFP_KERNEL);1954 if (!ar->mem_bitmap)1955 return -ENOMEM;1956 1957 /* try to read EEPROM, init MAC addr */1958 err = carl9170_read_eeprom(ar);1959 if (err)1960 return err;1961 1962 err = carl9170_parse_eeprom(ar);1963 if (err)1964 return err;1965 1966 err = ath_regd_init(regulatory, ar->hw->wiphy,1967 carl9170_reg_notifier);1968 if (err)1969 return err;1970 1971 if (modparam_noht) {1972 carl9170_band_2GHz.ht_cap.ht_supported = false;1973 carl9170_band_5GHz.ht_cap.ht_supported = false;1974 }1975 1976 for (i = 0; i < ar->fw.vif_num; i++) {1977 ar->vif_priv[i].id = i;1978 ar->vif_priv[i].vif = NULL;1979 }1980 1981 err = ieee80211_register_hw(ar->hw);1982 if (err)1983 return err;1984 1985 /* mac80211 interface is now registered */1986 ar->registered = true;1987 1988 if (!ath_is_world_regd(regulatory))1989 regulatory_hint(ar->hw->wiphy, regulatory->alpha2);1990 1991#ifdef CONFIG_CARL9170_DEBUGFS1992 carl9170_debugfs_register(ar);1993#endif /* CONFIG_CARL9170_DEBUGFS */1994 1995 err = carl9170_led_init(ar);1996 if (err)1997 goto err_unreg;1998 1999#ifdef CONFIG_CARL9170_LEDS2000 err = carl9170_led_register(ar);2001 if (err)2002 goto err_unreg;2003#endif /* CONFIG_CARL9170_LEDS */2004 2005#ifdef CONFIG_CARL9170_WPC2006 err = carl9170_register_wps_button(ar);2007 if (err)2008 goto err_unreg;2009#endif /* CONFIG_CARL9170_WPC */2010 2011#ifdef CONFIG_CARL9170_HWRNG2012 err = carl9170_register_hwrng(ar);2013 if (err)2014 goto err_unreg;2015#endif /* CONFIG_CARL9170_HWRNG */2016 2017 dev_info(&ar->udev->dev, "Atheros AR9170 is registered as '%s'\n",2018 wiphy_name(ar->hw->wiphy));2019 2020 return 0;2021 2022err_unreg:2023 carl9170_unregister(ar);2024 return err;2025}2026 2027void carl9170_unregister(struct ar9170 *ar)2028{2029 if (!ar->registered)2030 return;2031 2032 ar->registered = false;2033 2034#ifdef CONFIG_CARL9170_LEDS2035 carl9170_led_unregister(ar);2036#endif /* CONFIG_CARL9170_LEDS */2037 2038#ifdef CONFIG_CARL9170_DEBUGFS2039 carl9170_debugfs_unregister(ar);2040#endif /* CONFIG_CARL9170_DEBUGFS */2041 2042 carl9170_cancel_worker(ar);2043 cancel_work_sync(&ar->restart_work);2044 2045 ieee80211_unregister_hw(ar->hw);2046}2047 2048void carl9170_free(struct ar9170 *ar)2049{2050 WARN_ON(ar->registered);2051 WARN_ON(IS_INITIALIZED(ar));2052 2053 kfree_skb(ar->rx_failover);2054 ar->rx_failover = NULL;2055 2056 mutex_destroy(&ar->mutex);2057 2058 ieee80211_free_hw(ar->hw);2059}2060