1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 Copyright (C) 2010 Willow Garage <http://www.willowgarage.com> 4 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com> 5 <http://rt2x00.serialmonkey.com> 6 7 */ 8 9 /* 10 Module: rt2x00lib 11 Abstract: rt2x00 generic device routines. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/log2.h> 18 #include <linux/of.h> 19 #include <linux/of_net.h> 20 21 #include "rt2x00.h" 22 #include "rt2x00lib.h" 23 24 /* 25 * Utility functions. 26 */ 27 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev, 28 struct ieee80211_vif *vif) 29 { 30 /* 31 * When in STA mode, bssidx is always 0 otherwise local_address[5] 32 * contains the bss number, see BSS_ID_MASK comments for details. 33 */ 34 if (rt2x00dev->intf_sta_count) 35 return 0; 36 return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1); 37 } 38 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx); 39 40 /* 41 * Radio control handlers. 42 */ 43 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev) 44 { 45 int status; 46 47 /* 48 * Don't enable the radio twice. 49 * And check if the hardware button has been disabled. 50 */ 51 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 52 return 0; 53 54 /* 55 * Initialize all data queues. 56 */ 57 rt2x00queue_init_queues(rt2x00dev); 58 59 /* 60 * Enable radio. 61 */ 62 status = 63 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON); 64 if (status) 65 return status; 66 67 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON); 68 69 rt2x00leds_led_radio(rt2x00dev, true); 70 rt2x00led_led_activity(rt2x00dev, true); 71 72 set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags); 73 74 /* 75 * Enable queues. 76 */ 77 rt2x00queue_start_queues(rt2x00dev); 78 rt2x00link_start_tuner(rt2x00dev); 79 80 /* 81 * Start watchdog monitoring. 82 */ 83 rt2x00link_start_watchdog(rt2x00dev); 84 85 return 0; 86 } 87 88 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev) 89 { 90 if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 91 return; 92 93 /* 94 * Stop watchdog monitoring. 95 */ 96 rt2x00link_stop_watchdog(rt2x00dev); 97 98 /* 99 * Stop all queues 100 */ 101 rt2x00link_stop_tuner(rt2x00dev); 102 rt2x00queue_stop_queues(rt2x00dev); 103 rt2x00queue_flush_queues(rt2x00dev, true); 104 105 /* 106 * Disable radio. 107 */ 108 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF); 109 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF); 110 rt2x00led_led_activity(rt2x00dev, false); 111 rt2x00leds_led_radio(rt2x00dev, false); 112 } 113 114 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac, 115 struct ieee80211_vif *vif) 116 { 117 struct rt2x00_dev *rt2x00dev = data; 118 struct rt2x00_intf *intf = vif_to_intf(vif); 119 120 /* 121 * It is possible the radio was disabled while the work had been 122 * scheduled. If that happens we should return here immediately, 123 * note that in the spinlock protected area above the delayed_flags 124 * have been cleared correctly. 125 */ 126 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 127 return; 128 129 if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) { 130 mutex_lock(&intf->beacon_skb_mutex); 131 rt2x00queue_update_beacon(rt2x00dev, vif); 132 mutex_unlock(&intf->beacon_skb_mutex); 133 } 134 } 135 136 static void rt2x00lib_intf_scheduled(struct work_struct *work) 137 { 138 struct rt2x00_dev *rt2x00dev = 139 container_of(work, struct rt2x00_dev, intf_work); 140 141 /* 142 * Iterate over each interface and perform the 143 * requested configurations. 144 */ 145 ieee80211_iterate_active_interfaces(rt2x00dev->hw, 146 IEEE80211_IFACE_ITER_RESUME_ALL, 147 rt2x00lib_intf_scheduled_iter, 148 rt2x00dev); 149 } 150 151 static void rt2x00lib_autowakeup(struct work_struct *work) 152 { 153 struct rt2x00_dev *rt2x00dev = 154 container_of(work, struct rt2x00_dev, autowakeup_work.work); 155 156 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 157 return; 158 159 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE)) 160 rt2x00_err(rt2x00dev, "Device failed to wakeup\n"); 161 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags); 162 } 163 164 /* 165 * Interrupt context handlers. 166 */ 167 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac, 168 struct ieee80211_vif *vif) 169 { 170 struct ieee80211_tx_control control = {}; 171 struct rt2x00_dev *rt2x00dev = data; 172 struct sk_buff *skb; 173 174 /* 175 * Only AP mode interfaces do broad- and multicast buffering 176 */ 177 if (vif->type != NL80211_IFTYPE_AP) 178 return; 179 180 /* 181 * Send out buffered broad- and multicast frames 182 */ 183 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif); 184 while (skb) { 185 rt2x00mac_tx(rt2x00dev->hw, &control, skb); 186 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif); 187 } 188 } 189 190 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac, 191 struct ieee80211_vif *vif) 192 { 193 struct rt2x00_dev *rt2x00dev = data; 194 195 if (vif->type != NL80211_IFTYPE_AP && 196 vif->type != NL80211_IFTYPE_ADHOC && 197 vif->type != NL80211_IFTYPE_MESH_POINT && 198 vif->type != NL80211_IFTYPE_WDS) 199 return; 200 201 /* 202 * Update the beacon without locking. This is safe on PCI devices 203 * as they only update the beacon periodically here. This should 204 * never be called for USB devices. 205 */ 206 WARN_ON(rt2x00_is_usb(rt2x00dev)); 207 rt2x00queue_update_beacon(rt2x00dev, vif); 208 } 209 210 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev) 211 { 212 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 213 return; 214 215 /* send buffered bc/mc frames out for every bssid */ 216 ieee80211_iterate_active_interfaces_atomic( 217 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 218 rt2x00lib_bc_buffer_iter, rt2x00dev); 219 /* 220 * Devices with pre tbtt interrupt don't need to update the beacon 221 * here as they will fetch the next beacon directly prior to 222 * transmission. 223 */ 224 if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev)) 225 return; 226 227 /* fetch next beacon */ 228 ieee80211_iterate_active_interfaces_atomic( 229 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 230 rt2x00lib_beaconupdate_iter, rt2x00dev); 231 } 232 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone); 233 234 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev) 235 { 236 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 237 return; 238 239 /* fetch next beacon */ 240 ieee80211_iterate_active_interfaces_atomic( 241 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 242 rt2x00lib_beaconupdate_iter, rt2x00dev); 243 } 244 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt); 245 246 void rt2x00lib_dmastart(struct queue_entry *entry) 247 { 248 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); 249 rt2x00queue_index_inc(entry, Q_INDEX); 250 } 251 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart); 252 253 void rt2x00lib_dmadone(struct queue_entry *entry) 254 { 255 set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags); 256 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); 257 rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE); 258 } 259 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone); 260 261 static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry) 262 { 263 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 264 struct ieee80211_bar *bar = (void *) entry->skb->data; 265 struct rt2x00_bar_list_entry *bar_entry; 266 int ret; 267 268 if (likely(!ieee80211_is_back_req(bar->frame_control))) 269 return 0; 270 271 /* 272 * Unlike all other frames, the status report for BARs does 273 * not directly come from the hardware as it is incapable of 274 * matching a BA to a previously send BAR. The hardware will 275 * report all BARs as if they weren't acked at all. 276 * 277 * Instead the RX-path will scan for incoming BAs and set the 278 * block_acked flag if it sees one that was likely caused by 279 * a BAR from us. 280 * 281 * Remove remaining BARs here and return their status for 282 * TX done processing. 283 */ 284 ret = 0; 285 rcu_read_lock(); 286 list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) { 287 if (bar_entry->entry != entry) 288 continue; 289 290 spin_lock_bh(&rt2x00dev->bar_list_lock); 291 /* Return whether this BAR was blockacked or not */ 292 ret = bar_entry->block_acked; 293 /* Remove the BAR from our checklist */ 294 list_del_rcu(&bar_entry->list); 295 spin_unlock_bh(&rt2x00dev->bar_list_lock); 296 kfree_rcu(bar_entry, head); 297 298 break; 299 } 300 rcu_read_unlock(); 301 302 return ret; 303 } 304 305 static void rt2x00lib_fill_tx_status(struct rt2x00_dev *rt2x00dev, 306 struct ieee80211_tx_info *tx_info, 307 struct skb_frame_desc *skbdesc, 308 struct txdone_entry_desc *txdesc, 309 bool success) 310 { 311 u8 rate_idx, rate_flags, retry_rates; 312 int i; 313 314 rate_idx = skbdesc->tx_rate_idx; 315 rate_flags = skbdesc->tx_rate_flags; 316 retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ? 317 (txdesc->retry + 1) : 1; 318 319 /* 320 * Initialize TX status 321 */ 322 memset(&tx_info->status, 0, sizeof(tx_info->status)); 323 tx_info->status.ack_signal = 0; 324 325 /* 326 * Frame was send with retries, hardware tried 327 * different rates to send out the frame, at each 328 * retry it lowered the rate 1 step except when the 329 * lowest rate was used. 330 */ 331 for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) { 332 tx_info->status.rates[i].idx = rate_idx - i; 333 tx_info->status.rates[i].flags = rate_flags; 334 335 if (rate_idx - i == 0) { 336 /* 337 * The lowest rate (index 0) was used until the 338 * number of max retries was reached. 339 */ 340 tx_info->status.rates[i].count = retry_rates - i; 341 i++; 342 break; 343 } 344 tx_info->status.rates[i].count = 1; 345 } 346 if (i < (IEEE80211_TX_MAX_RATES - 1)) 347 tx_info->status.rates[i].idx = -1; /* terminate */ 348 349 if (test_bit(TXDONE_NO_ACK_REQ, &txdesc->flags)) 350 tx_info->flags |= IEEE80211_TX_CTL_NO_ACK; 351 352 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) { 353 if (success) 354 tx_info->flags |= IEEE80211_TX_STAT_ACK; 355 else 356 rt2x00dev->low_level_stats.dot11ACKFailureCount++; 357 } 358 359 /* 360 * Every single frame has it's own tx status, hence report 361 * every frame as ampdu of size 1. 362 * 363 * TODO: if we can find out how many frames were aggregated 364 * by the hw we could provide the real ampdu_len to mac80211 365 * which would allow the rc algorithm to better decide on 366 * which rates are suitable. 367 */ 368 if (test_bit(TXDONE_AMPDU, &txdesc->flags) || 369 tx_info->flags & IEEE80211_TX_CTL_AMPDU) { 370 tx_info->flags |= IEEE80211_TX_STAT_AMPDU | 371 IEEE80211_TX_CTL_AMPDU; 372 tx_info->status.ampdu_len = 1; 373 tx_info->status.ampdu_ack_len = success ? 1 : 0; 374 } 375 376 if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) { 377 if (success) 378 rt2x00dev->low_level_stats.dot11RTSSuccessCount++; 379 else 380 rt2x00dev->low_level_stats.dot11RTSFailureCount++; 381 } 382 } 383 384 static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev, 385 struct queue_entry *entry) 386 { 387 /* 388 * Make this entry available for reuse. 389 */ 390 entry->skb = NULL; 391 entry->flags = 0; 392 393 rt2x00dev->ops->lib->clear_entry(entry); 394 395 rt2x00queue_index_inc(entry, Q_INDEX_DONE); 396 397 /* 398 * If the data queue was below the threshold before the txdone 399 * handler we must make sure the packet queue in the mac80211 stack 400 * is reenabled when the txdone handler has finished. This has to be 401 * serialized with rt2x00mac_tx(), otherwise we can wake up queue 402 * before it was stopped. 403 */ 404 spin_lock_bh(&entry->queue->tx_lock); 405 if (!rt2x00queue_threshold(entry->queue)) 406 rt2x00queue_unpause_queue(entry->queue); 407 spin_unlock_bh(&entry->queue->tx_lock); 408 } 409 410 void rt2x00lib_txdone_nomatch(struct queue_entry *entry, 411 struct txdone_entry_desc *txdesc) 412 { 413 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 414 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); 415 struct ieee80211_tx_info txinfo = {}; 416 bool success; 417 418 /* 419 * Unmap the skb. 420 */ 421 rt2x00queue_unmap_skb(entry); 422 423 /* 424 * Signal that the TX descriptor is no longer in the skb. 425 */ 426 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB; 427 428 /* 429 * Send frame to debugfs immediately, after this call is completed 430 * we are going to overwrite the skb->cb array. 431 */ 432 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry); 433 434 /* 435 * Determine if the frame has been successfully transmitted and 436 * remove BARs from our check list while checking for their 437 * TX status. 438 */ 439 success = 440 rt2x00lib_txdone_bar_status(entry) || 441 test_bit(TXDONE_SUCCESS, &txdesc->flags); 442 443 if (!test_bit(TXDONE_UNKNOWN, &txdesc->flags)) { 444 /* 445 * Update TX statistics. 446 */ 447 rt2x00dev->link.qual.tx_success += success; 448 rt2x00dev->link.qual.tx_failed += !success; 449 450 rt2x00lib_fill_tx_status(rt2x00dev, &txinfo, skbdesc, txdesc, 451 success); 452 ieee80211_tx_status_noskb(rt2x00dev->hw, skbdesc->sta, &txinfo); 453 } 454 455 dev_kfree_skb_any(entry->skb); 456 rt2x00lib_clear_entry(rt2x00dev, entry); 457 } 458 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_nomatch); 459 460 void rt2x00lib_txdone(struct queue_entry *entry, 461 struct txdone_entry_desc *txdesc) 462 { 463 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 464 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb); 465 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); 466 u8 skbdesc_flags = skbdesc->flags; 467 unsigned int header_length; 468 bool success; 469 470 /* 471 * Unmap the skb. 472 */ 473 rt2x00queue_unmap_skb(entry); 474 475 /* 476 * Remove the extra tx headroom from the skb. 477 */ 478 skb_pull(entry->skb, rt2x00dev->extra_tx_headroom); 479 480 /* 481 * Signal that the TX descriptor is no longer in the skb. 482 */ 483 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB; 484 485 /* 486 * Determine the length of 802.11 header. 487 */ 488 header_length = ieee80211_get_hdrlen_from_skb(entry->skb); 489 490 /* 491 * Remove L2 padding which was added during 492 */ 493 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD)) 494 rt2x00queue_remove_l2pad(entry->skb, header_length); 495 496 /* 497 * If the IV/EIV data was stripped from the frame before it was 498 * passed to the hardware, we should now reinsert it again because 499 * mac80211 will expect the same data to be present it the 500 * frame as it was passed to us. 501 */ 502 if (rt2x00_has_cap_hw_crypto(rt2x00dev)) 503 rt2x00crypto_tx_insert_iv(entry->skb, header_length); 504 505 /* 506 * Send frame to debugfs immediately, after this call is completed 507 * we are going to overwrite the skb->cb array. 508 */ 509 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry); 510 511 /* 512 * Determine if the frame has been successfully transmitted and 513 * remove BARs from our check list while checking for their 514 * TX status. 515 */ 516 success = 517 rt2x00lib_txdone_bar_status(entry) || 518 test_bit(TXDONE_SUCCESS, &txdesc->flags) || 519 test_bit(TXDONE_UNKNOWN, &txdesc->flags); 520 521 /* 522 * Update TX statistics. 523 */ 524 rt2x00dev->link.qual.tx_success += success; 525 rt2x00dev->link.qual.tx_failed += !success; 526 527 rt2x00lib_fill_tx_status(rt2x00dev, tx_info, skbdesc, txdesc, success); 528 529 /* 530 * Only send the status report to mac80211 when it's a frame 531 * that originated in mac80211. If this was a extra frame coming 532 * through a mac80211 library call (RTS/CTS) then we should not 533 * send the status report back. 534 */ 535 if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) { 536 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT)) 537 ieee80211_tx_status(rt2x00dev->hw, entry->skb); 538 else 539 ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb); 540 } else { 541 dev_kfree_skb_any(entry->skb); 542 } 543 544 rt2x00lib_clear_entry(rt2x00dev, entry); 545 } 546 EXPORT_SYMBOL_GPL(rt2x00lib_txdone); 547 548 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status) 549 { 550 struct txdone_entry_desc txdesc; 551 552 txdesc.flags = 0; 553 __set_bit(status, &txdesc.flags); 554 txdesc.retry = 0; 555 556 rt2x00lib_txdone(entry, &txdesc); 557 } 558 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo); 559 560 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie) 561 { 562 struct ieee80211_mgmt *mgmt = (void *)data; 563 u8 *pos, *end; 564 565 pos = (u8 *)mgmt->u.beacon.variable; 566 end = data + len; 567 while (pos < end) { 568 if (pos + 2 + pos[1] > end) 569 return NULL; 570 571 if (pos[0] == ie) 572 return pos; 573 574 pos += 2 + pos[1]; 575 } 576 577 return NULL; 578 } 579 580 static void rt2x00lib_sleep(struct work_struct *work) 581 { 582 struct rt2x00_dev *rt2x00dev = 583 container_of(work, struct rt2x00_dev, sleep_work); 584 585 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 586 return; 587 588 /* 589 * Check again is powersaving is enabled, to prevent races from delayed 590 * work execution. 591 */ 592 if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags)) 593 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 594 IEEE80211_CONF_CHANGE_PS); 595 } 596 597 static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev, 598 struct sk_buff *skb, 599 struct rxdone_entry_desc *rxdesc) 600 { 601 struct rt2x00_bar_list_entry *entry; 602 struct ieee80211_bar *ba = (void *)skb->data; 603 604 if (likely(!ieee80211_is_back(ba->frame_control))) 605 return; 606 607 if (rxdesc->size < sizeof(*ba) + FCS_LEN) 608 return; 609 610 rcu_read_lock(); 611 list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) { 612 613 if (ba->start_seq_num != entry->start_seq_num) 614 continue; 615 616 #define TID_CHECK(a, b) ( \ 617 ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) == \ 618 ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK))) \ 619 620 if (!TID_CHECK(ba->control, entry->control)) 621 continue; 622 623 #undef TID_CHECK 624 625 if (!ether_addr_equal_64bits(ba->ra, entry->ta)) 626 continue; 627 628 if (!ether_addr_equal_64bits(ba->ta, entry->ra)) 629 continue; 630 631 /* Mark BAR since we received the according BA */ 632 spin_lock_bh(&rt2x00dev->bar_list_lock); 633 entry->block_acked = 1; 634 spin_unlock_bh(&rt2x00dev->bar_list_lock); 635 break; 636 } 637 rcu_read_unlock(); 638 639 } 640 641 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev, 642 struct sk_buff *skb, 643 struct rxdone_entry_desc *rxdesc) 644 { 645 struct ieee80211_hdr *hdr = (void *) skb->data; 646 struct ieee80211_tim_ie *tim_ie; 647 u8 *tim; 648 u8 tim_len; 649 bool cam; 650 651 /* If this is not a beacon, or if mac80211 has no powersaving 652 * configured, or if the device is already in powersaving mode 653 * we can exit now. */ 654 if (likely(!ieee80211_is_beacon(hdr->frame_control) || 655 !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS))) 656 return; 657 658 /* min. beacon length + FCS_LEN */ 659 if (skb->len <= 40 + FCS_LEN) 660 return; 661 662 /* and only beacons from the associated BSSID, please */ 663 if (!(rxdesc->dev_flags & RXDONE_MY_BSS) || 664 !rt2x00dev->aid) 665 return; 666 667 rt2x00dev->last_beacon = jiffies; 668 669 tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM); 670 if (!tim) 671 return; 672 673 if (tim[1] < sizeof(*tim_ie)) 674 return; 675 676 tim_len = tim[1]; 677 tim_ie = (struct ieee80211_tim_ie *) &tim[2]; 678 679 /* Check whenever the PHY can be turned off again. */ 680 681 /* 1. What about buffered unicast traffic for our AID? */ 682 cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid); 683 684 /* 2. Maybe the AP wants to send multicast/broadcast data? */ 685 cam |= (tim_ie->bitmap_ctrl & 0x01); 686 687 if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags)) 688 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work); 689 } 690 691 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev, 692 struct rxdone_entry_desc *rxdesc) 693 { 694 struct ieee80211_supported_band *sband; 695 const struct rt2x00_rate *rate; 696 unsigned int i; 697 int signal = rxdesc->signal; 698 int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK); 699 700 switch (rxdesc->rate_mode) { 701 case RATE_MODE_CCK: 702 case RATE_MODE_OFDM: 703 /* 704 * For non-HT rates the MCS value needs to contain the 705 * actually used rate modulation (CCK or OFDM). 706 */ 707 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS) 708 signal = RATE_MCS(rxdesc->rate_mode, signal); 709 710 sband = &rt2x00dev->bands[rt2x00dev->curr_band]; 711 for (i = 0; i < sband->n_bitrates; i++) { 712 rate = rt2x00_get_rate(sband->bitrates[i].hw_value); 713 if (((type == RXDONE_SIGNAL_PLCP) && 714 (rate->plcp == signal)) || 715 ((type == RXDONE_SIGNAL_BITRATE) && 716 (rate->bitrate == signal)) || 717 ((type == RXDONE_SIGNAL_MCS) && 718 (rate->mcs == signal))) { 719 return i; 720 } 721 } 722 break; 723 case RATE_MODE_HT_MIX: 724 case RATE_MODE_HT_GREENFIELD: 725 if (signal >= 0 && signal <= 76) 726 return signal; 727 break; 728 default: 729 break; 730 } 731 732 rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n", 733 rxdesc->rate_mode, signal, type); 734 return 0; 735 } 736 737 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp) 738 { 739 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 740 struct rxdone_entry_desc rxdesc; 741 struct sk_buff *skb; 742 struct ieee80211_rx_status *rx_status; 743 unsigned int header_length; 744 int rate_idx; 745 746 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) || 747 !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 748 goto submit_entry; 749 750 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags)) 751 goto submit_entry; 752 753 /* 754 * Allocate a new sk_buffer. If no new buffer available, drop the 755 * received frame and reuse the existing buffer. 756 */ 757 skb = rt2x00queue_alloc_rxskb(entry, gfp); 758 if (!skb) 759 goto submit_entry; 760 761 /* 762 * Unmap the skb. 763 */ 764 rt2x00queue_unmap_skb(entry); 765 766 /* 767 * Extract the RXD details. 768 */ 769 memset(&rxdesc, 0, sizeof(rxdesc)); 770 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc); 771 772 /* 773 * Check for valid size in case we get corrupted descriptor from 774 * hardware. 775 */ 776 if (unlikely(rxdesc.size == 0 || 777 rxdesc.size > entry->queue->data_size)) { 778 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n", 779 rxdesc.size, entry->queue->data_size); 780 dev_kfree_skb(entry->skb); 781 goto renew_skb; 782 } 783 784 /* 785 * The data behind the ieee80211 header must be 786 * aligned on a 4 byte boundary. 787 */ 788 header_length = ieee80211_get_hdrlen_from_skb(entry->skb); 789 790 /* 791 * Hardware might have stripped the IV/EIV/ICV data, 792 * in that case it is possible that the data was 793 * provided separately (through hardware descriptor) 794 * in which case we should reinsert the data into the frame. 795 */ 796 if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) && 797 (rxdesc.flags & RX_FLAG_IV_STRIPPED)) 798 rt2x00crypto_rx_insert_iv(entry->skb, header_length, 799 &rxdesc); 800 else if (header_length && 801 (rxdesc.size > header_length) && 802 (rxdesc.dev_flags & RXDONE_L2PAD)) 803 rt2x00queue_remove_l2pad(entry->skb, header_length); 804 805 /* Trim buffer to correct size */ 806 skb_trim(entry->skb, rxdesc.size); 807 808 /* 809 * Translate the signal to the correct bitrate index. 810 */ 811 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc); 812 if (rxdesc.rate_mode == RATE_MODE_HT_MIX || 813 rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD) 814 rxdesc.encoding = RX_ENC_HT; 815 816 /* 817 * Check if this is a beacon, and more frames have been 818 * buffered while we were in powersaving mode. 819 */ 820 rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc); 821 822 /* 823 * Check for incoming BlockAcks to match to the BlockAckReqs 824 * we've send out. 825 */ 826 rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc); 827 828 /* 829 * Update extra components 830 */ 831 rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc); 832 rt2x00debug_update_crypto(rt2x00dev, &rxdesc); 833 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry); 834 835 /* 836 * Initialize RX status information, and send frame 837 * to mac80211. 838 */ 839 rx_status = IEEE80211_SKB_RXCB(entry->skb); 840 841 /* Ensure that all fields of rx_status are initialized 842 * properly. The skb->cb array was used for driver 843 * specific informations, so rx_status might contain 844 * garbage. 845 */ 846 memset(rx_status, 0, sizeof(*rx_status)); 847 848 rx_status->mactime = rxdesc.timestamp; 849 rx_status->band = rt2x00dev->curr_band; 850 rx_status->freq = rt2x00dev->curr_freq; 851 rx_status->rate_idx = rate_idx; 852 rx_status->signal = rxdesc.rssi; 853 rx_status->flag = rxdesc.flags; 854 rx_status->enc_flags = rxdesc.enc_flags; 855 rx_status->encoding = rxdesc.encoding; 856 rx_status->bw = rxdesc.bw; 857 rx_status->antenna = rt2x00dev->link.ant.active.rx; 858 859 ieee80211_rx_ni(rt2x00dev->hw, entry->skb); 860 861 renew_skb: 862 /* 863 * Replace the skb with the freshly allocated one. 864 */ 865 entry->skb = skb; 866 867 submit_entry: 868 entry->flags = 0; 869 rt2x00queue_index_inc(entry, Q_INDEX_DONE); 870 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) && 871 test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) 872 rt2x00dev->ops->lib->clear_entry(entry); 873 } 874 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone); 875 876 /* 877 * Driver initialization handlers. 878 */ 879 const struct rt2x00_rate rt2x00_supported_rates[12] = { 880 { 881 .flags = DEV_RATE_CCK, 882 .bitrate = 10, 883 .ratemask = BIT(0), 884 .plcp = 0x00, 885 .mcs = RATE_MCS(RATE_MODE_CCK, 0), 886 }, 887 { 888 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, 889 .bitrate = 20, 890 .ratemask = BIT(1), 891 .plcp = 0x01, 892 .mcs = RATE_MCS(RATE_MODE_CCK, 1), 893 }, 894 { 895 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, 896 .bitrate = 55, 897 .ratemask = BIT(2), 898 .plcp = 0x02, 899 .mcs = RATE_MCS(RATE_MODE_CCK, 2), 900 }, 901 { 902 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, 903 .bitrate = 110, 904 .ratemask = BIT(3), 905 .plcp = 0x03, 906 .mcs = RATE_MCS(RATE_MODE_CCK, 3), 907 }, 908 { 909 .flags = DEV_RATE_OFDM, 910 .bitrate = 60, 911 .ratemask = BIT(4), 912 .plcp = 0x0b, 913 .mcs = RATE_MCS(RATE_MODE_OFDM, 0), 914 }, 915 { 916 .flags = DEV_RATE_OFDM, 917 .bitrate = 90, 918 .ratemask = BIT(5), 919 .plcp = 0x0f, 920 .mcs = RATE_MCS(RATE_MODE_OFDM, 1), 921 }, 922 { 923 .flags = DEV_RATE_OFDM, 924 .bitrate = 120, 925 .ratemask = BIT(6), 926 .plcp = 0x0a, 927 .mcs = RATE_MCS(RATE_MODE_OFDM, 2), 928 }, 929 { 930 .flags = DEV_RATE_OFDM, 931 .bitrate = 180, 932 .ratemask = BIT(7), 933 .plcp = 0x0e, 934 .mcs = RATE_MCS(RATE_MODE_OFDM, 3), 935 }, 936 { 937 .flags = DEV_RATE_OFDM, 938 .bitrate = 240, 939 .ratemask = BIT(8), 940 .plcp = 0x09, 941 .mcs = RATE_MCS(RATE_MODE_OFDM, 4), 942 }, 943 { 944 .flags = DEV_RATE_OFDM, 945 .bitrate = 360, 946 .ratemask = BIT(9), 947 .plcp = 0x0d, 948 .mcs = RATE_MCS(RATE_MODE_OFDM, 5), 949 }, 950 { 951 .flags = DEV_RATE_OFDM, 952 .bitrate = 480, 953 .ratemask = BIT(10), 954 .plcp = 0x08, 955 .mcs = RATE_MCS(RATE_MODE_OFDM, 6), 956 }, 957 { 958 .flags = DEV_RATE_OFDM, 959 .bitrate = 540, 960 .ratemask = BIT(11), 961 .plcp = 0x0c, 962 .mcs = RATE_MCS(RATE_MODE_OFDM, 7), 963 }, 964 }; 965 966 static void rt2x00lib_channel(struct ieee80211_channel *entry, 967 const int channel, const int tx_power, 968 const int value) 969 { 970 /* XXX: this assumption about the band is wrong for 802.11j */ 971 entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ; 972 entry->center_freq = ieee80211_channel_to_frequency(channel, 973 entry->band); 974 entry->hw_value = value; 975 entry->max_power = tx_power; 976 entry->max_antenna_gain = 0xff; 977 } 978 979 static void rt2x00lib_rate(struct ieee80211_rate *entry, 980 const u16 index, const struct rt2x00_rate *rate) 981 { 982 entry->flags = 0; 983 entry->bitrate = rate->bitrate; 984 entry->hw_value = index; 985 entry->hw_value_short = index; 986 987 if (rate->flags & DEV_RATE_SHORT_PREAMBLE) 988 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE; 989 } 990 991 void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr) 992 { 993 const char *mac_addr; 994 995 mac_addr = of_get_mac_address(rt2x00dev->dev->of_node); 996 if (!IS_ERR(mac_addr)) 997 ether_addr_copy(eeprom_mac_addr, mac_addr); 998 999 if (!is_valid_ether_addr(eeprom_mac_addr)) { 1000 eth_random_addr(eeprom_mac_addr); 1001 rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr); 1002 } 1003 } 1004 EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address); 1005 1006 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev, 1007 struct hw_mode_spec *spec) 1008 { 1009 struct ieee80211_hw *hw = rt2x00dev->hw; 1010 struct ieee80211_channel *channels; 1011 struct ieee80211_rate *rates; 1012 unsigned int num_rates; 1013 unsigned int i; 1014 1015 num_rates = 0; 1016 if (spec->supported_rates & SUPPORT_RATE_CCK) 1017 num_rates += 4; 1018 if (spec->supported_rates & SUPPORT_RATE_OFDM) 1019 num_rates += 8; 1020 1021 channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL); 1022 if (!channels) 1023 return -ENOMEM; 1024 1025 rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL); 1026 if (!rates) 1027 goto exit_free_channels; 1028 1029 /* 1030 * Initialize Rate list. 1031 */ 1032 for (i = 0; i < num_rates; i++) 1033 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i)); 1034 1035 /* 1036 * Initialize Channel list. 1037 */ 1038 for (i = 0; i < spec->num_channels; i++) { 1039 rt2x00lib_channel(&channels[i], 1040 spec->channels[i].channel, 1041 spec->channels_info[i].max_power, i); 1042 } 1043 1044 /* 1045 * Intitialize 802.11b, 802.11g 1046 * Rates: CCK, OFDM. 1047 * Channels: 2.4 GHz 1048 */ 1049 if (spec->supported_bands & SUPPORT_BAND_2GHZ) { 1050 rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14; 1051 rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates; 1052 rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels; 1053 rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates; 1054 hw->wiphy->bands[NL80211_BAND_2GHZ] = 1055 &rt2x00dev->bands[NL80211_BAND_2GHZ]; 1056 memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap, 1057 &spec->ht, sizeof(spec->ht)); 1058 } 1059 1060 /* 1061 * Intitialize 802.11a 1062 * Rates: OFDM. 1063 * Channels: OFDM, UNII, HiperLAN2. 1064 */ 1065 if (spec->supported_bands & SUPPORT_BAND_5GHZ) { 1066 rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels = 1067 spec->num_channels - 14; 1068 rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates = 1069 num_rates - 4; 1070 rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14]; 1071 rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4]; 1072 hw->wiphy->bands[NL80211_BAND_5GHZ] = 1073 &rt2x00dev->bands[NL80211_BAND_5GHZ]; 1074 memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap, 1075 &spec->ht, sizeof(spec->ht)); 1076 } 1077 1078 return 0; 1079 1080 exit_free_channels: 1081 kfree(channels); 1082 rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n"); 1083 return -ENOMEM; 1084 } 1085 1086 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev) 1087 { 1088 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags)) 1089 ieee80211_unregister_hw(rt2x00dev->hw); 1090 1091 if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) { 1092 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels); 1093 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates); 1094 rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL; 1095 rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL; 1096 } 1097 1098 kfree(rt2x00dev->spec.channels_info); 1099 } 1100 1101 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev) 1102 { 1103 struct hw_mode_spec *spec = &rt2x00dev->spec; 1104 int status; 1105 1106 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags)) 1107 return 0; 1108 1109 /* 1110 * Initialize HW modes. 1111 */ 1112 status = rt2x00lib_probe_hw_modes(rt2x00dev, spec); 1113 if (status) 1114 return status; 1115 1116 /* 1117 * Initialize HW fields. 1118 */ 1119 rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues; 1120 1121 /* 1122 * Initialize extra TX headroom required. 1123 */ 1124 rt2x00dev->hw->extra_tx_headroom = 1125 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM, 1126 rt2x00dev->extra_tx_headroom); 1127 1128 /* 1129 * Take TX headroom required for alignment into account. 1130 */ 1131 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD)) 1132 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE; 1133 else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA)) 1134 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE; 1135 1136 /* 1137 * Tell mac80211 about the size of our private STA structure. 1138 */ 1139 rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta); 1140 1141 /* 1142 * Allocate tx status FIFO for driver use. 1143 */ 1144 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) { 1145 /* 1146 * Allocate the txstatus fifo. In the worst case the tx 1147 * status fifo has to hold the tx status of all entries 1148 * in all tx queues. Hence, calculate the kfifo size as 1149 * tx_queues * entry_num and round up to the nearest 1150 * power of 2. 1151 */ 1152 int kfifo_size = 1153 roundup_pow_of_two(rt2x00dev->ops->tx_queues * 1154 rt2x00dev->tx->limit * 1155 sizeof(u32)); 1156 1157 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size, 1158 GFP_KERNEL); 1159 if (status) 1160 return status; 1161 } 1162 1163 /* 1164 * Initialize tasklets if used by the driver. Tasklets are 1165 * disabled until the interrupts are turned on. The driver 1166 * has to handle that. 1167 */ 1168 #define RT2X00_TASKLET_INIT(taskletname) \ 1169 if (rt2x00dev->ops->lib->taskletname) { \ 1170 tasklet_setup(&rt2x00dev->taskletname, \ 1171 rt2x00dev->ops->lib->taskletname); \ 1172 } 1173 1174 RT2X00_TASKLET_INIT(txstatus_tasklet); 1175 RT2X00_TASKLET_INIT(pretbtt_tasklet); 1176 RT2X00_TASKLET_INIT(tbtt_tasklet); 1177 RT2X00_TASKLET_INIT(rxdone_tasklet); 1178 RT2X00_TASKLET_INIT(autowake_tasklet); 1179 1180 #undef RT2X00_TASKLET_INIT 1181 1182 /* 1183 * Register HW. 1184 */ 1185 status = ieee80211_register_hw(rt2x00dev->hw); 1186 if (status) 1187 return status; 1188 1189 set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags); 1190 1191 return 0; 1192 } 1193 1194 /* 1195 * Initialization/uninitialization handlers. 1196 */ 1197 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev) 1198 { 1199 if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags)) 1200 return; 1201 1202 /* 1203 * Stop rfkill polling. 1204 */ 1205 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL)) 1206 rt2x00rfkill_unregister(rt2x00dev); 1207 1208 /* 1209 * Allow the HW to uninitialize. 1210 */ 1211 rt2x00dev->ops->lib->uninitialize(rt2x00dev); 1212 1213 /* 1214 * Free allocated queue entries. 1215 */ 1216 rt2x00queue_uninitialize(rt2x00dev); 1217 } 1218 1219 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev) 1220 { 1221 int status; 1222 1223 if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags)) 1224 return 0; 1225 1226 /* 1227 * Allocate all queue entries. 1228 */ 1229 status = rt2x00queue_initialize(rt2x00dev); 1230 if (status) 1231 return status; 1232 1233 /* 1234 * Initialize the device. 1235 */ 1236 status = rt2x00dev->ops->lib->initialize(rt2x00dev); 1237 if (status) { 1238 rt2x00queue_uninitialize(rt2x00dev); 1239 return status; 1240 } 1241 1242 set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags); 1243 1244 /* 1245 * Start rfkill polling. 1246 */ 1247 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL)) 1248 rt2x00rfkill_register(rt2x00dev); 1249 1250 return 0; 1251 } 1252 1253 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev) 1254 { 1255 int retval = 0; 1256 1257 /* 1258 * If this is the first interface which is added, 1259 * we should load the firmware now. 1260 */ 1261 retval = rt2x00lib_load_firmware(rt2x00dev); 1262 if (retval) 1263 goto out; 1264 1265 /* 1266 * Initialize the device. 1267 */ 1268 retval = rt2x00lib_initialize(rt2x00dev); 1269 if (retval) 1270 goto out; 1271 1272 rt2x00dev->intf_ap_count = 0; 1273 rt2x00dev->intf_sta_count = 0; 1274 rt2x00dev->intf_associated = 0; 1275 1276 /* Enable the radio */ 1277 retval = rt2x00lib_enable_radio(rt2x00dev); 1278 if (retval) 1279 goto out; 1280 1281 set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags); 1282 1283 out: 1284 return retval; 1285 } 1286 1287 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev) 1288 { 1289 if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) 1290 return; 1291 1292 /* 1293 * Perhaps we can add something smarter here, 1294 * but for now just disabling the radio should do. 1295 */ 1296 rt2x00lib_disable_radio(rt2x00dev); 1297 1298 rt2x00dev->intf_ap_count = 0; 1299 rt2x00dev->intf_sta_count = 0; 1300 rt2x00dev->intf_associated = 0; 1301 } 1302 1303 static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev) 1304 { 1305 struct ieee80211_iface_limit *if_limit; 1306 struct ieee80211_iface_combination *if_combination; 1307 1308 if (rt2x00dev->ops->max_ap_intf < 2) 1309 return; 1310 1311 /* 1312 * Build up AP interface limits structure. 1313 */ 1314 if_limit = &rt2x00dev->if_limits_ap; 1315 if_limit->max = rt2x00dev->ops->max_ap_intf; 1316 if_limit->types = BIT(NL80211_IFTYPE_AP); 1317 #ifdef CONFIG_MAC80211_MESH 1318 if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT); 1319 #endif 1320 1321 /* 1322 * Build up AP interface combinations structure. 1323 */ 1324 if_combination = &rt2x00dev->if_combinations[IF_COMB_AP]; 1325 if_combination->limits = if_limit; 1326 if_combination->n_limits = 1; 1327 if_combination->max_interfaces = if_limit->max; 1328 if_combination->num_different_channels = 1; 1329 1330 /* 1331 * Finally, specify the possible combinations to mac80211. 1332 */ 1333 rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations; 1334 rt2x00dev->hw->wiphy->n_iface_combinations = 1; 1335 } 1336 1337 static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev) 1338 { 1339 if (WARN_ON(!rt2x00dev->tx)) 1340 return 0; 1341 1342 if (rt2x00_is_usb(rt2x00dev)) 1343 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size; 1344 1345 return rt2x00dev->tx[0].winfo_size; 1346 } 1347 1348 /* 1349 * driver allocation handlers. 1350 */ 1351 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev) 1352 { 1353 int retval = -ENOMEM; 1354 1355 /* 1356 * Set possible interface combinations. 1357 */ 1358 rt2x00lib_set_if_combinations(rt2x00dev); 1359 1360 /* 1361 * Allocate the driver data memory, if necessary. 1362 */ 1363 if (rt2x00dev->ops->drv_data_size > 0) { 1364 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size, 1365 GFP_KERNEL); 1366 if (!rt2x00dev->drv_data) { 1367 retval = -ENOMEM; 1368 goto exit; 1369 } 1370 } 1371 1372 spin_lock_init(&rt2x00dev->irqmask_lock); 1373 mutex_init(&rt2x00dev->csr_mutex); 1374 mutex_init(&rt2x00dev->conf_mutex); 1375 INIT_LIST_HEAD(&rt2x00dev->bar_list); 1376 spin_lock_init(&rt2x00dev->bar_list_lock); 1377 hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC, 1378 HRTIMER_MODE_REL); 1379 1380 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 1381 1382 /* 1383 * Make room for rt2x00_intf inside the per-interface 1384 * structure ieee80211_vif. 1385 */ 1386 rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf); 1387 1388 /* 1389 * rt2x00 devices can only use the last n bits of the MAC address 1390 * for virtual interfaces. 1391 */ 1392 rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] = 1393 (rt2x00dev->ops->max_ap_intf - 1); 1394 1395 /* 1396 * Initialize work. 1397 */ 1398 rt2x00dev->workqueue = 1399 alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy)); 1400 if (!rt2x00dev->workqueue) { 1401 retval = -ENOMEM; 1402 goto exit; 1403 } 1404 1405 INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled); 1406 INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup); 1407 INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep); 1408 1409 /* 1410 * Let the driver probe the device to detect the capabilities. 1411 */ 1412 retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev); 1413 if (retval) { 1414 rt2x00_err(rt2x00dev, "Failed to allocate device\n"); 1415 goto exit; 1416 } 1417 1418 /* 1419 * Allocate queue array. 1420 */ 1421 retval = rt2x00queue_allocate(rt2x00dev); 1422 if (retval) 1423 goto exit; 1424 1425 /* Cache TX headroom value */ 1426 rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev); 1427 1428 /* 1429 * Determine which operating modes are supported, all modes 1430 * which require beaconing, depend on the availability of 1431 * beacon entries. 1432 */ 1433 rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION); 1434 if (rt2x00dev->bcn->limit > 0) 1435 rt2x00dev->hw->wiphy->interface_modes |= 1436 BIT(NL80211_IFTYPE_ADHOC) | 1437 #ifdef CONFIG_MAC80211_MESH 1438 BIT(NL80211_IFTYPE_MESH_POINT) | 1439 #endif 1440 #ifdef CONFIG_WIRELESS_WDS 1441 BIT(NL80211_IFTYPE_WDS) | 1442 #endif 1443 BIT(NL80211_IFTYPE_AP); 1444 1445 rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN; 1446 1447 wiphy_ext_feature_set(rt2x00dev->hw->wiphy, 1448 NL80211_EXT_FEATURE_CQM_RSSI_LIST); 1449 1450 /* 1451 * Initialize ieee80211 structure. 1452 */ 1453 retval = rt2x00lib_probe_hw(rt2x00dev); 1454 if (retval) { 1455 rt2x00_err(rt2x00dev, "Failed to initialize hw\n"); 1456 goto exit; 1457 } 1458 1459 /* 1460 * Register extra components. 1461 */ 1462 rt2x00link_register(rt2x00dev); 1463 rt2x00leds_register(rt2x00dev); 1464 rt2x00debug_register(rt2x00dev); 1465 1466 /* 1467 * Start rfkill polling. 1468 */ 1469 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL)) 1470 rt2x00rfkill_register(rt2x00dev); 1471 1472 return 0; 1473 1474 exit: 1475 rt2x00lib_remove_dev(rt2x00dev); 1476 1477 return retval; 1478 } 1479 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev); 1480 1481 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev) 1482 { 1483 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 1484 1485 /* 1486 * Stop rfkill polling. 1487 */ 1488 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL)) 1489 rt2x00rfkill_unregister(rt2x00dev); 1490 1491 /* 1492 * Disable radio. 1493 */ 1494 rt2x00lib_disable_radio(rt2x00dev); 1495 1496 /* 1497 * Stop all work. 1498 */ 1499 cancel_work_sync(&rt2x00dev->intf_work); 1500 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work); 1501 cancel_work_sync(&rt2x00dev->sleep_work); 1502 1503 hrtimer_cancel(&rt2x00dev->txstatus_timer); 1504 1505 /* 1506 * Kill the tx status tasklet. 1507 */ 1508 tasklet_kill(&rt2x00dev->txstatus_tasklet); 1509 tasklet_kill(&rt2x00dev->pretbtt_tasklet); 1510 tasklet_kill(&rt2x00dev->tbtt_tasklet); 1511 tasklet_kill(&rt2x00dev->rxdone_tasklet); 1512 tasklet_kill(&rt2x00dev->autowake_tasklet); 1513 1514 /* 1515 * Uninitialize device. 1516 */ 1517 rt2x00lib_uninitialize(rt2x00dev); 1518 1519 if (rt2x00dev->workqueue) 1520 destroy_workqueue(rt2x00dev->workqueue); 1521 1522 /* 1523 * Free the tx status fifo. 1524 */ 1525 kfifo_free(&rt2x00dev->txstatus_fifo); 1526 1527 /* 1528 * Free extra components 1529 */ 1530 rt2x00debug_deregister(rt2x00dev); 1531 rt2x00leds_unregister(rt2x00dev); 1532 1533 /* 1534 * Free ieee80211_hw memory. 1535 */ 1536 rt2x00lib_remove_hw(rt2x00dev); 1537 1538 /* 1539 * Free firmware image. 1540 */ 1541 rt2x00lib_free_firmware(rt2x00dev); 1542 1543 /* 1544 * Free queue structures. 1545 */ 1546 rt2x00queue_free(rt2x00dev); 1547 1548 /* 1549 * Free the driver data. 1550 */ 1551 kfree(rt2x00dev->drv_data); 1552 } 1553 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev); 1554 1555 /* 1556 * Device state handlers 1557 */ 1558 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev) 1559 { 1560 rt2x00_dbg(rt2x00dev, "Going to sleep\n"); 1561 1562 /* 1563 * Prevent mac80211 from accessing driver while suspended. 1564 */ 1565 if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 1566 return 0; 1567 1568 /* 1569 * Cleanup as much as possible. 1570 */ 1571 rt2x00lib_uninitialize(rt2x00dev); 1572 1573 /* 1574 * Suspend/disable extra components. 1575 */ 1576 rt2x00leds_suspend(rt2x00dev); 1577 rt2x00debug_deregister(rt2x00dev); 1578 1579 /* 1580 * Set device mode to sleep for power management, 1581 * on some hardware this call seems to consistently fail. 1582 * From the specifications it is hard to tell why it fails, 1583 * and if this is a "bad thing". 1584 * Overall it is safe to just ignore the failure and 1585 * continue suspending. The only downside is that the 1586 * device will not be in optimal power save mode, but with 1587 * the radio and the other components already disabled the 1588 * device is as good as disabled. 1589 */ 1590 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP)) 1591 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n"); 1592 1593 return 0; 1594 } 1595 EXPORT_SYMBOL_GPL(rt2x00lib_suspend); 1596 1597 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev) 1598 { 1599 rt2x00_dbg(rt2x00dev, "Waking up\n"); 1600 1601 /* 1602 * Restore/enable extra components. 1603 */ 1604 rt2x00debug_register(rt2x00dev); 1605 rt2x00leds_resume(rt2x00dev); 1606 1607 /* 1608 * We are ready again to receive requests from mac80211. 1609 */ 1610 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 1611 1612 return 0; 1613 } 1614 EXPORT_SYMBOL_GPL(rt2x00lib_resume); 1615 1616 /* 1617 * rt2x00lib module information. 1618 */ 1619 MODULE_AUTHOR(DRV_PROJECT); 1620 MODULE_VERSION(DRV_VERSION); 1621 MODULE_DESCRIPTION("rt2x00 library"); 1622 MODULE_LICENSE("GPL"); 1623