SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/zd1211rw/zd_mac.c

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   6  * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/usb.h>
  26 #include <linux/jiffies.h>
  27 #include <net/ieee80211_radiotap.h>
  28
  29 #include "zd_def.h"
  30 #include "zd_chip.h"
  31 #include "zd_mac.h"
  32 #include "zd_ieee80211.h"
  33 #include "zd_rf.h"
  34
  35 /* This table contains the hardware specific values for the modulation rates. */
  36 static const struct ieee80211_rate zd_rates[] = {
  37         { .rate = 10,
  38           .val = ZD_CCK_RATE_1M,
  39           .flags = IEEE80211_RATE_CCK },
  40         { .rate = 20,
  41           .val = ZD_CCK_RATE_2M,
  42           .val2 = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
  43           .flags = IEEE80211_RATE_CCK_2 },
  44         { .rate = 55,
  45           .val = ZD_CCK_RATE_5_5M,
  46           .val2 = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
  47           .flags = IEEE80211_RATE_CCK_2 },
  48         { .rate = 110,
  49           .val = ZD_CCK_RATE_11M,
  50           .val2 = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
  51           .flags = IEEE80211_RATE_CCK_2 },
  52         { .rate = 60,
  53           .val = ZD_OFDM_RATE_6M,
  54           .flags = IEEE80211_RATE_OFDM },
  55         { .rate = 90,
  56           .val = ZD_OFDM_RATE_9M,
  57           .flags = IEEE80211_RATE_OFDM },
  58         { .rate = 120,
  59           .val = ZD_OFDM_RATE_12M,
  60           .flags = IEEE80211_RATE_OFDM },
  61         { .rate = 180,
  62           .val = ZD_OFDM_RATE_18M,
  63           .flags = IEEE80211_RATE_OFDM },
  64         { .rate = 240,
  65           .val = ZD_OFDM_RATE_24M,
  66           .flags = IEEE80211_RATE_OFDM },
  67         { .rate = 360,
  68           .val = ZD_OFDM_RATE_36M,
  69           .flags = IEEE80211_RATE_OFDM },
  70         { .rate = 480,
  71           .val = ZD_OFDM_RATE_48M,
  72           .flags = IEEE80211_RATE_OFDM },
  73         { .rate = 540,
  74           .val = ZD_OFDM_RATE_54M,
  75           .flags = IEEE80211_RATE_OFDM },
  76 };
  77
  78 static const struct ieee80211_channel zd_channels[] = {
  79         { .chan = 1,
  80           .freq = 2412},
  81         { .chan = 2,
  82           .freq = 2417},
  83         { .chan = 3,
  84           .freq = 2422},
  85         { .chan = 4,
  86           .freq = 2427},
  87         { .chan = 5,
  88           .freq = 2432},
  89         { .chan = 6,
  90           .freq = 2437},
  91         { .chan = 7,
  92           .freq = 2442},
  93         { .chan = 8,
  94           .freq = 2447},
  95         { .chan = 9,
  96           .freq = 2452},
  97         { .chan = 10,
  98           .freq = 2457},
  99         { .chan = 11,
 100           .freq = 2462},
 101         { .chan = 12,
 102           .freq = 2467},
 103         { .chan = 13,
 104           .freq = 2472},
 105         { .chan = 14,
 106           .freq = 2484}
 107 };
 108
 109 static void housekeeping_init(struct zd_mac *mac);
 110 static void housekeeping_enable(struct zd_mac *mac);
 111 static void housekeeping_disable(struct zd_mac *mac);
 112
 113 int zd_mac_preinit_hw(struct ieee80211_hw *hw)
 114 {
 115         int r;
 116         u8 addr[ETH_ALEN];
 117         struct zd_mac *mac = zd_hw_mac(hw);
 118
 119         r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
 120         if (r)
 121                 return r;
 122
 123         SET_IEEE80211_PERM_ADDR(hw, addr);
 124
 125         return 0;
 126 }
 127
 128 int zd_mac_init_hw(struct ieee80211_hw *hw)
 129 {
 130         int r;
 131         struct zd_mac *mac = zd_hw_mac(hw);
 132         struct zd_chip *chip = &mac->chip;
 133         u8 default_regdomain;
 134
 135         r = zd_chip_enable_int(chip);
 136         if (r)
 137                 goto out;
 138         r = zd_chip_init_hw(chip);
 139         if (r)
 140                 goto disable_int;
 141
 142         ZD_ASSERT(!irqs_disabled());
 143
 144         r = zd_read_regdomain(chip, &default_regdomain);
 145         if (r)
 146                 goto disable_int;
 147         spin_lock_irq(&mac->lock);
 148         mac->regdomain = mac->default_regdomain = default_regdomain;
 149         spin_unlock_irq(&mac->lock);
 150
 151         /* We must inform the device that we are doing encryption/decryption in
 152          * software at the moment. */
 153         r = zd_set_encryption_type(chip, ENC_SNIFFER);
 154         if (r)
 155                 goto disable_int;
 156
 157         zd_geo_init(hw, mac->regdomain);
 158
 159         r = 0;
 160 disable_int:
 161         zd_chip_disable_int(chip);
 162 out:
 163         return r;
 164 }
 165
 166 void zd_mac_clear(struct zd_mac *mac)
 167 {
 168         flush_workqueue(zd_workqueue);
 169         zd_chip_clear(&mac->chip);
 170         ZD_ASSERT(!spin_is_locked(&mac->lock));
 171         ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
 172 }
 173
 174 static int set_rx_filter(struct zd_mac *mac)
 175 {
 176         unsigned long flags;
 177         u32 filter = STA_RX_FILTER;
 178
 179         spin_lock_irqsave(&mac->lock, flags);
 180         if (mac->pass_ctrl)
 181                 filter |= RX_FILTER_CTRL;
 182         spin_unlock_irqrestore(&mac->lock, flags);
 183
 184         return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter);
 185 }
 186
 187 static int set_mc_hash(struct zd_mac *mac)
 188 {
 189         struct zd_mc_hash hash;
 190         zd_mc_clear(&hash);
 191         return zd_chip_set_multicast_hash(&mac->chip, &hash);
 192 }
 193
 194 static int zd_op_start(struct ieee80211_hw *hw)
 195 {
 196         struct zd_mac *mac = zd_hw_mac(hw);
 197         struct zd_chip *chip = &mac->chip;
 198         struct zd_usb *usb = &chip->usb;
 199         int r;
 200
 201         if (!usb->initialized) {
 202                 r = zd_usb_init_hw(usb);
 203                 if (r)
 204                         goto out;
 205         }
 206
 207         r = zd_chip_enable_int(chip);
 208         if (r < 0)
 209                 goto out;
 210
 211         r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
 212         if (r < 0)
 213                 goto disable_int;
 214         r = set_rx_filter(mac);
 215         if (r)
 216                 goto disable_int;
 217         r = set_mc_hash(mac);
 218         if (r)
 219                 goto disable_int;
 220         r = zd_chip_switch_radio_on(chip);
 221         if (r < 0)
 222                 goto disable_int;
 223         r = zd_chip_enable_rxtx(chip);
 224         if (r < 0)
 225                 goto disable_radio;
 226         r = zd_chip_enable_hwint(chip);
 227         if (r < 0)
 228                 goto disable_rxtx;
 229
 230         housekeeping_enable(mac);
 231         return 0;
 232 disable_rxtx:
 233         zd_chip_disable_rxtx(chip);
 234 disable_radio:
 235         zd_chip_switch_radio_off(chip);
 236 disable_int:
 237         zd_chip_disable_int(chip);
 238 out:
 239         return r;
 240 }
 241
 242 /**
 243  * clear_tx_skb_control_block - clears the control block of tx skbuffs
 244  * @skb: a &struct sk_buff pointer
 245  *
 246  * This clears the control block of skbuff buffers, which were transmitted to
 247  * the device. Notify that the function is not thread-safe, so prevent
 248  * multiple calls.
 249  */
 250 static void clear_tx_skb_control_block(struct sk_buff *skb)
 251 {
 252         struct zd_tx_skb_control_block *cb =
 253                 (struct zd_tx_skb_control_block *)skb->cb;
 254
 255         kfree(cb->control);
 256         cb->control = NULL;
 257 }
 258
 259 /**
 260  * kfree_tx_skb - frees a tx skbuff
 261  * @skb: a &struct sk_buff pointer
 262  *
 263  * Frees the tx skbuff. Frees also the allocated control structure in the
 264  * control block if necessary.
 265  */
 266 static void kfree_tx_skb(struct sk_buff *skb)
 267 {
 268         clear_tx_skb_control_block(skb);
 269         dev_kfree_skb_any(skb);
 270 }
 271
 272 static void zd_op_stop(struct ieee80211_hw *hw)
 273 {
 274         struct zd_mac *mac = zd_hw_mac(hw);
 275         struct zd_chip *chip = &mac->chip;
 276         struct sk_buff *skb;
 277         struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
 278
 279         /* The order here deliberately is a little different from the open()
 280          * method, since we need to make sure there is no opportunity for RX
 281          * frames to be processed by mac80211 after we have stopped it.
 282          */
 283
 284         zd_chip_disable_rxtx(chip);
 285         housekeeping_disable(mac);
 286         flush_workqueue(zd_workqueue);
 287
 288         zd_chip_disable_hwint(chip);
 289         zd_chip_switch_radio_off(chip);
 290         zd_chip_disable_int(chip);
 291
 292
 293         while ((skb = skb_dequeue(ack_wait_queue)))
 294                 kfree_tx_skb(skb);
 295 }
 296
 297 /**
 298  * init_tx_skb_control_block - initializes skb control block
 299  * @skb: a &sk_buff pointer
 300  * @dev: pointer to the mac80221 device
 301  * @control: mac80211 tx control applying for the frame in @skb
 302  *
 303  * Initializes the control block of the skbuff to be transmitted.
 304  */
 305 static int init_tx_skb_control_block(struct sk_buff *skb,
 306                                      struct ieee80211_hw *hw,
 307                                      struct ieee80211_tx_control *control)
 308 {
 309         struct zd_tx_skb_control_block *cb =
 310                 (struct zd_tx_skb_control_block *)skb->cb;
 311
 312         ZD_ASSERT(sizeof(*cb) <= sizeof(skb->cb));
 313         memset(cb, 0, sizeof(*cb));
 314         cb->hw= hw;
 315         cb->control = kmalloc(sizeof(*control), GFP_ATOMIC);
 316         if (cb->control == NULL)
 317                 return -ENOMEM;
 318         memcpy(cb->control, control, sizeof(*control));
 319
 320         return 0;
 321 }
 322
 323 /**
 324  * tx_status - reports tx status of a packet if required
 325  * @hw - a &struct ieee80211_hw pointer
 326  * @skb - a sk-buffer
 327  * @status - the tx status of the packet without control information
 328  * @success - True for successfull transmission of the frame
 329  *
 330  * This information calls ieee80211_tx_status_irqsafe() if required by the
 331  * control information. It copies the control information into the status
 332  * information.
 333  *
 334  * If no status information has been requested, the skb is freed.
 335  */
 336 static void tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 337                       struct ieee80211_tx_status *status,
 338                       bool success)
 339 {
 340         struct zd_tx_skb_control_block *cb = (struct zd_tx_skb_control_block *)
 341                 skb->cb;
 342
 343         ZD_ASSERT(cb->control != NULL);
 344         memcpy(&status->control, cb->control, sizeof(status->control));
 345         if (!success)
 346                 status->excessive_retries = 1;
 347         clear_tx_skb_control_block(skb);
 348         ieee80211_tx_status_irqsafe(hw, skb, status);
 349 }
 350
 351 /**
 352  * zd_mac_tx_failed - callback for failed frames
 353  * @dev: the mac80211 wireless device
 354  *
 355  * This function is called if a frame couldn't be succesfully be
 356  * transferred. The first frame from the tx queue, will be selected and
 357  * reported as error to the upper layers.
 358  */
 359 void zd_mac_tx_failed(struct ieee80211_hw *hw)
 360 {
 361         struct sk_buff_head *q = &zd_hw_mac(hw)->ack_wait_queue;
 362         struct sk_buff *skb;
 363         struct ieee80211_tx_status status = {{0}};
 364
 365         skb = skb_dequeue(q);
 366         if (skb == NULL)
 367                 return;
 368         tx_status(hw, skb, &status, 0);
 369 }
 370
 371 /**
 372  * zd_mac_tx_to_dev - callback for USB layer
 373  * @skb: a &sk_buff pointer
 374  * @error: error value, 0 if transmission successful
 375  *
 376  * Informs the MAC layer that the frame has successfully transferred to the
 377  * device. If an ACK is required and the transfer to the device has been
 378  * successful, the packets are put on the @ack_wait_queue with
 379  * the control set removed.
 380  */
 381 void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
 382 {
 383         struct zd_tx_skb_control_block *cb =
 384                 (struct zd_tx_skb_control_block *)skb->cb;
 385         struct ieee80211_hw *hw = cb->hw;
 386
 387         if (likely(cb->control)) {
 388                 skb_pull(skb, sizeof(struct zd_ctrlset));
 389                 if (unlikely(error ||
 390                     (cb->control->flags & IEEE80211_TXCTL_NO_ACK)))
 391                 {
 392                         struct ieee80211_tx_status status = {{0}};
 393                         tx_status(hw, skb, &status, !error);
 394                 } else {
 395                         struct sk_buff_head *q =
 396                                 &zd_hw_mac(hw)->ack_wait_queue;
 397
 398                         skb_queue_tail(q, skb);
 399                         while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS)
 400                                 zd_mac_tx_failed(hw);
 401                 }
 402         } else {
 403                 kfree_tx_skb(skb);
 404         }
 405 }
 406
 407 static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
 408 {
 409         /* ZD_PURE_RATE() must be used to remove the modulation type flag of
 410          * the zd-rate values.
 411          */
 412         static const u8 rate_divisor[] = {
 413                 [ZD_PURE_RATE(ZD_CCK_RATE_1M)]   =  1,
 414                 [ZD_PURE_RATE(ZD_CCK_RATE_2M)]   =  2,
 415                 /* Bits must be doubled. */
 416                 [ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11,
 417                 [ZD_PURE_RATE(ZD_CCK_RATE_11M)]  = 11,
 418                 [ZD_PURE_RATE(ZD_OFDM_RATE_6M)]  =  6,
 419                 [ZD_PURE_RATE(ZD_OFDM_RATE_9M)]  =  9,
 420                 [ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12,
 421                 [ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18,
 422                 [ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24,
 423                 [ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36,
 424                 [ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48,
 425                 [ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54,
 426         };
 427
 428         u32 bits = (u32)tx_length * 8;
 429         u32 divisor;
 430
 431         divisor = rate_divisor[ZD_PURE_RATE(zd_rate)];
 432         if (divisor == 0)
 433                 return -EINVAL;
 434
 435         switch (zd_rate) {
 436         case ZD_CCK_RATE_5_5M:
 437                 bits = (2*bits) + 10; /* round up to the next integer */
 438                 break;
 439         case ZD_CCK_RATE_11M:
 440                 if (service) {
 441                         u32 t = bits % 11;
 442                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 443                         if (0 < t && t <= 3) {
 444                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 445                         }
 446                 }
 447                 bits += 10; /* round up to the next integer */
 448                 break;
 449         }
 450
 451         return bits/divisor;
 452 }
 453
 454 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 455                            struct ieee80211_hdr *header, u32 flags)
 456 {
 457         u16 fctl = le16_to_cpu(header->frame_control);
 458
 459         /*
 460          * CONTROL TODO:
 461          * - if backoff needed, enable bit 0
 462          * - if burst (backoff not needed) disable bit 0
 463          */
 464
 465         cs->control = 0;
 466
 467         /* First fragment */
 468         if (flags & IEEE80211_TXCTL_FIRST_FRAGMENT)
 469                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 470
 471         /* Multicast */
 472         if (is_multicast_ether_addr(header->addr1))
 473                 cs->control |= ZD_CS_MULTICAST;
 474
 475         /* PS-POLL */
 476         if ((fctl & (IEEE80211_FCTL_FTYPE|IEEE80211_FCTL_STYPE)) ==
 477             (IEEE80211_FTYPE_CTL|IEEE80211_STYPE_PSPOLL))
 478                 cs->control |= ZD_CS_PS_POLL_FRAME;
 479
 480         if (flags & IEEE80211_TXCTL_USE_RTS_CTS)
 481                 cs->control |= ZD_CS_RTS;
 482
 483         if (flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
 484                 cs->control |= ZD_CS_SELF_CTS;
 485
 486         /* FIXME: Management frame? */
 487 }
 488
 489 static int fill_ctrlset(struct zd_mac *mac,
 490                         struct sk_buff *skb,
 491                         struct ieee80211_tx_control *control)
 492 {
 493         int r;
 494         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 495         unsigned int frag_len = skb->len + FCS_LEN;
 496         unsigned int packet_length;
 497         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 498                 skb_push(skb, sizeof(struct zd_ctrlset));
 499
 500         ZD_ASSERT(frag_len <= 0xffff);
 501
 502         cs->modulation = control->tx_rate;
 503
 504         cs->tx_length = cpu_to_le16(frag_len);
 505
 506         cs_set_control(mac, cs, hdr, control->flags);
 507
 508         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 509         ZD_ASSERT(packet_length <= 0xffff);
 510         /* ZD1211B: Computing the length difference this way, gives us
 511          * flexibility to compute the packet length.
 512          */
 513         cs->packet_length = cpu_to_le16(zd_chip_is_zd1211b(&mac->chip) ?
 514                         packet_length - frag_len : packet_length);
 515
 516         /*
 517          * CURRENT LENGTH:
 518          * - transmit frame length in microseconds
 519          * - seems to be derived from frame length
 520          * - see Cal_Us_Service() in zdinlinef.h
 521          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 522          *  - bTxBurstEnable is never set in the vendor driver
 523          *
 524          * SERVICE:
 525          * - "for PLCP configuration"
 526          * - always 0 except in some situations at 802.11b 11M
 527          * - see line 53 of zdinlinef.h
 528          */
 529         cs->service = 0;
 530         r = zd_calc_tx_length_us(&cs->service, ZD_RATE(cs->modulation),
 531                                  le16_to_cpu(cs->tx_length));
 532         if (r < 0)
 533                 return r;
 534         cs->current_length = cpu_to_le16(r);
 535         cs->next_frame_length = 0;
 536
 537         return 0;
 538 }
 539
 540 /**
 541  * zd_op_tx - transmits a network frame to the device
 542  *
 543  * @dev: mac80211 hardware device
 544  * @skb: socket buffer
 545  * @control: the control structure
 546  *
 547  * This function transmit an IEEE 802.11 network frame to the device. The
 548  * control block of the skbuff will be initialized. If necessary the incoming
 549  * mac80211 queues will be stopped.
 550  */
 551 static int zd_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
 552                      struct ieee80211_tx_control *control)
 553 {
 554         struct zd_mac *mac = zd_hw_mac(hw);
 555         int r;
 556
 557         r = fill_ctrlset(mac, skb, control);
 558         if (r)
 559                 return r;
 560
 561         r = init_tx_skb_control_block(skb, hw, control);
 562         if (r)
 563                 return r;
 564         r = zd_usb_tx(&mac->chip.usb, skb);
 565         if (r) {
 566                 clear_tx_skb_control_block(skb);
 567                 return r;
 568         }
 569         return 0;
 570 }
 571
 572 /**
 573  * filter_ack - filters incoming packets for acknowledgements
 574  * @dev: the mac80211 device
 575  * @rx_hdr: received header
 576  * @stats: the status for the received packet
 577  *
 578  * This functions looks for ACK packets and tries to match them with the
 579  * frames in the tx queue. If a match is found the frame will be dequeued and
 580  * the upper layers is informed about the successful transmission. If
 581  * mac80211 queues have been stopped and the number of frames still to be
 582  * transmitted is low the queues will be opened again.
 583  *
 584  * Returns 1 if the frame was an ACK, 0 if it was ignored.
 585  */
 586 static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
 587                       struct ieee80211_rx_status *stats)
 588 {
 589         u16 fc = le16_to_cpu(rx_hdr->frame_control);
 590         struct sk_buff *skb;
 591         struct sk_buff_head *q;
 592         unsigned long flags;
 593
 594         if ((fc & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) !=
 595             (IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK))
 596                 return 0;
 597
 598         q = &zd_hw_mac(hw)->ack_wait_queue;
 599         spin_lock_irqsave(&q->lock, flags);
 600         for (skb = q->next; skb != (struct sk_buff *)q; skb = skb->next) {
 601                 struct ieee80211_hdr *tx_hdr;
 602
 603                 tx_hdr = (struct ieee80211_hdr *)skb->data;
 604                 if (likely(!compare_ether_addr(tx_hdr->addr2, rx_hdr->addr1)))
 605                 {
 606                         struct ieee80211_tx_status status = {{0}};
 607                         status.flags = IEEE80211_TX_STATUS_ACK;
 608                         status.ack_signal = stats->ssi;
 609                         __skb_unlink(skb, q);
 610                         tx_status(hw, skb, &status, 1);
 611                         goto out;
 612                 }
 613         }
 614 out:
 615         spin_unlock_irqrestore(&q->lock, flags);
 616         return 1;
 617 }
 618
 619 int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
 620 {
 621         struct zd_mac *mac = zd_hw_mac(hw);
 622         struct ieee80211_rx_status stats;
 623         const struct rx_status *status;
 624         struct sk_buff *skb;
 625         int bad_frame = 0;
 626         u16 fc;
 627         bool is_qos, is_4addr, need_padding;
 628
 629         if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
 630                      FCS_LEN + sizeof(struct rx_status))
 631                 return -EINVAL;
 632
 633         memset(&stats, 0, sizeof(stats));
 634
 635         /* Note about pass_failed_fcs and pass_ctrl access below:
 636          * mac locking intentionally omitted here, as this is the only unlocked
 637          * reader and the only writer is configure_filter. Plus, if there were
 638          * any races accessing these variables, it wouldn't really matter.
 639          * If mac80211 ever provides a way for us to access filter flags
 640          * from outside configure_filter, we could improve on this. Also, this
 641          * situation may change once we implement some kind of DMA-into-skb
 642          * RX path. */
 643
 644         /* Caller has to ensure that length >= sizeof(struct rx_status). */
 645         status = (struct rx_status *)
 646                 (buffer + (length - sizeof(struct rx_status)));
 647         if (status->frame_status & ZD_RX_ERROR) {
 648                 if (mac->pass_failed_fcs &&
 649                                 (status->frame_status & ZD_RX_CRC32_ERROR)) {
 650                         stats.flag |= RX_FLAG_FAILED_FCS_CRC;
 651                         bad_frame = 1;
 652                 } else {
 653                         return -EINVAL;
 654                 }
 655         }
 656
 657         stats.channel = _zd_chip_get_channel(&mac->chip);
 658         stats.freq = zd_channels[stats.channel - 1].freq;
 659         stats.phymode = MODE_IEEE80211G;
 660         stats.ssi = status->signal_strength;
 661         stats.signal = zd_rx_qual_percent(buffer,
 662                                           length - sizeof(struct rx_status),
 663                                           status);
 664         stats.rate = zd_rx_rate(buffer, status);
 665
 666         length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status);
 667         buffer += ZD_PLCP_HEADER_SIZE;
 668
 669         /* Except for bad frames, filter each frame to see if it is an ACK, in
 670          * which case our internal TX tracking is updated. Normally we then
 671          * bail here as there's no need to pass ACKs on up to the stack, but
 672          * there is also the case where the stack has requested us to pass
 673          * control frames on up (pass_ctrl) which we must consider. */
 674         if (!bad_frame &&
 675                         filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats)
 676                         && !mac->pass_ctrl)
 677                 return 0;
 678
 679         fc = le16_to_cpu(*((__le16 *) buffer));
 680
 681         is_qos = ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
 682                  ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_QOS_DATA);
 683         is_4addr = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 684                    (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
 685         need_padding = is_qos ^ is_4addr;
 686
 687         skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
 688         if (skb == NULL)
 689                 return -ENOMEM;
 690         if (need_padding) {
 691                 /* Make sure the the payload data is 4 byte aligned. */
 692                 skb_reserve(skb, 2);
 693         }
 694
 695         memcpy(skb_put(skb, length), buffer, length);
 696
 697         ieee80211_rx_irqsafe(hw, skb, &stats);
 698         return 0;
 699 }
 700
 701 static int zd_op_add_interface(struct ieee80211_hw *hw,
 702                                 struct ieee80211_if_init_conf *conf)
 703 {
 704         struct zd_mac *mac = zd_hw_mac(hw);
 705
 706         /* using IEEE80211_IF_TYPE_INVALID to indicate no mode selected */
 707         if (mac->type != IEEE80211_IF_TYPE_INVALID)
 708                 return -EOPNOTSUPP;
 709
 710         switch (conf->type) {
 711         case IEEE80211_IF_TYPE_MNTR:
 712         case IEEE80211_IF_TYPE_STA:
 713                 mac->type = conf->type;
 714                 break;
 715         default:
 716                 return -EOPNOTSUPP;
 717         }
 718
 719         return zd_write_mac_addr(&mac->chip, conf->mac_addr);
 720 }
 721
 722 static void zd_op_remove_interface(struct ieee80211_hw *hw,
 723                                     struct ieee80211_if_init_conf *conf)
 724 {
 725         struct zd_mac *mac = zd_hw_mac(hw);
 726         mac->type = IEEE80211_IF_TYPE_INVALID;
 727         zd_write_mac_addr(&mac->chip, NULL);
 728 }
 729
 730 static int zd_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 731 {
 732         struct zd_mac *mac = zd_hw_mac(hw);
 733         return zd_chip_set_channel(&mac->chip, conf->channel);
 734 }
 735
 736 static int zd_op_config_interface(struct ieee80211_hw *hw,
 737                                   struct ieee80211_vif *vif,
 738                                    struct ieee80211_if_conf *conf)
 739 {
 740         struct zd_mac *mac = zd_hw_mac(hw);
 741
 742         spin_lock_irq(&mac->lock);
 743         mac->associated = is_valid_ether_addr(conf->bssid);
 744         spin_unlock_irq(&mac->lock);
 745
 746         /* TODO: do hardware bssid filtering */
 747         return 0;
 748 }
 749
 750 static void set_multicast_hash_handler(struct work_struct *work)
 751 {
 752         struct zd_mac *mac =
 753                 container_of(work, struct zd_mac, set_multicast_hash_work);
 754         struct zd_mc_hash hash;
 755
 756         spin_lock_irq(&mac->lock);
 757         hash = mac->multicast_hash;
 758         spin_unlock_irq(&mac->lock);
 759
 760         zd_chip_set_multicast_hash(&mac->chip, &hash);
 761 }
 762
 763 static void set_rx_filter_handler(struct work_struct *work)
 764 {
 765         struct zd_mac *mac =
 766                 container_of(work, struct zd_mac, set_rx_filter_work);
 767         int r;
 768
 769         dev_dbg_f(zd_mac_dev(mac), "\n");
 770         r = set_rx_filter(mac);
 771         if (r)
 772                 dev_err(zd_mac_dev(mac), "set_rx_filter_handler error %d\n", r);
 773 }
 774
 775 #define SUPPORTED_FIF_FLAGS \
 776         (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
 777         FIF_OTHER_BSS)
 778 static void zd_op_configure_filter(struct ieee80211_hw *hw,
 779                         unsigned int changed_flags,
 780                         unsigned int *new_flags,
 781                         int mc_count, struct dev_mc_list *mclist)
 782 {
 783         struct zd_mc_hash hash;
 784         struct zd_mac *mac = zd_hw_mac(hw);
 785         unsigned long flags;
 786         int i;
 787
 788         /* Only deal with supported flags */
 789         changed_flags &= SUPPORTED_FIF_FLAGS;
 790         *new_flags &= SUPPORTED_FIF_FLAGS;
 791
 792         /* changed_flags is always populated but this driver
 793          * doesn't support all FIF flags so its possible we don't
 794          * need to do anything */
 795         if (!changed_flags)
 796                 return;
 797
 798         if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)) {
 799                 zd_mc_add_all(&hash);
 800         } else {
 801                 DECLARE_MAC_BUF(macbuf);
 802
 803                 zd_mc_clear(&hash);
 804                 for (i = 0; i < mc_count; i++) {
 805                         if (!mclist)
 806                                 break;
 807                         dev_dbg_f(zd_mac_dev(mac), "mc addr %s\n",
 808                                   print_mac(macbuf, mclist->dmi_addr));
 809                         zd_mc_add_addr(&hash, mclist->dmi_addr);
 810                         mclist = mclist->next;
 811                 }
 812         }
 813
 814         spin_lock_irqsave(&mac->lock, flags);
 815         mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
 816         mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
 817         mac->multicast_hash = hash;
 818         spin_unlock_irqrestore(&mac->lock, flags);
 819         queue_work(zd_workqueue, &mac->set_multicast_hash_work);
 820
 821         if (changed_flags & FIF_CONTROL)
 822                 queue_work(zd_workqueue, &mac->set_rx_filter_work);
 823
 824         /* no handling required for FIF_OTHER_BSS as we don't currently
 825          * do BSSID filtering */
 826         /* FIXME: in future it would be nice to enable the probe response
 827          * filter (so that the driver doesn't see them) until
 828          * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
 829          * have to schedule work to enable prbresp reception, which might
 830          * happen too late. For now we'll just listen and forward them all the
 831          * time. */
 832 }
 833
 834 static void set_rts_cts_work(struct work_struct *work)
 835 {
 836         struct zd_mac *mac =
 837                 container_of(work, struct zd_mac, set_rts_cts_work);
 838         unsigned long flags;
 839         unsigned int short_preamble;
 840
 841         mutex_lock(&mac->chip.mutex);
 842
 843         spin_lock_irqsave(&mac->lock, flags);
 844         mac->updating_rts_rate = 0;
 845         short_preamble = mac->short_preamble;
 846         spin_unlock_irqrestore(&mac->lock, flags);
 847
 848         zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble);
 849         mutex_unlock(&mac->chip.mutex);
 850 }
 851
 852 static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
 853                                    struct ieee80211_vif *vif,
 854                                    struct ieee80211_bss_conf *bss_conf,
 855                                    u32 changes)
 856 {
 857         struct zd_mac *mac = zd_hw_mac(hw);
 858         unsigned long flags;
 859
 860         dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes);
 861
 862         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 863                 spin_lock_irqsave(&mac->lock, flags);
 864                 mac->short_preamble = bss_conf->use_short_preamble;
 865                 if (!mac->updating_rts_rate) {
 866                         mac->updating_rts_rate = 1;
 867                         /* FIXME: should disable TX here, until work has
 868                          * completed and RTS_CTS reg is updated */
 869                         queue_work(zd_workqueue, &mac->set_rts_cts_work);
 870                 }
 871                 spin_unlock_irqrestore(&mac->lock, flags);
 872         }
 873 }
 874
 875 static const struct ieee80211_ops zd_ops = {
 876         .tx                     = zd_op_tx,
 877         .start                  = zd_op_start,
 878         .stop                   = zd_op_stop,
 879         .add_interface          = zd_op_add_interface,
 880         .remove_interface       = zd_op_remove_interface,
 881         .config                 = zd_op_config,
 882         .config_interface       = zd_op_config_interface,
 883         .configure_filter       = zd_op_configure_filter,
 884         .bss_info_changed       = zd_op_bss_info_changed,
 885 };
 886
 887 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
 888 {
 889         struct zd_mac *mac;
 890         struct ieee80211_hw *hw;
 891         int i;
 892
 893         hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops);
 894         if (!hw) {
 895                 dev_dbg_f(&intf->dev, "out of memory\n");
 896                 return NULL;
 897         }
 898
 899         mac = zd_hw_mac(hw);
 900
 901         memset(mac, 0, sizeof(*mac));
 902         spin_lock_init(&mac->lock);
 903         mac->hw = hw;
 904
 905         mac->type = IEEE80211_IF_TYPE_INVALID;
 906
 907         memcpy(mac->channels, zd_channels, sizeof(zd_channels));
 908         memcpy(mac->rates, zd_rates, sizeof(zd_rates));
 909         mac->modes[0].mode = MODE_IEEE80211G;
 910         mac->modes[0].num_rates = ARRAY_SIZE(zd_rates);
 911         mac->modes[0].rates = mac->rates;
 912         mac->modes[0].num_channels = ARRAY_SIZE(zd_channels);
 913         mac->modes[0].channels = mac->channels;
 914         mac->modes[1].mode = MODE_IEEE80211B;
 915         mac->modes[1].num_rates = 4;
 916         mac->modes[1].rates = mac->rates;
 917         mac->modes[1].num_channels = ARRAY_SIZE(zd_channels);
 918         mac->modes[1].channels = mac->channels;
 919
 920         hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 921                      IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED;
 922         hw->max_rssi = 100;
 923         hw->max_signal = 100;
 924
 925         hw->queues = 1;
 926         hw->extra_tx_headroom = sizeof(struct zd_ctrlset);
 927
 928         skb_queue_head_init(&mac->ack_wait_queue);
 929
 930         for (i = 0; i < 2; i++) {
 931                 if (ieee80211_register_hwmode(hw, &mac->modes[i])) {
 932                         dev_dbg_f(&intf->dev, "cannot register hwmode\n");
 933                         ieee80211_free_hw(hw);
 934                         return NULL;
 935                 }
 936         }
 937
 938         zd_chip_init(&mac->chip, hw, intf);
 939         housekeeping_init(mac);
 940         INIT_WORK(&mac->set_multicast_hash_work, set_multicast_hash_handler);
 941         INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work);
 942         INIT_WORK(&mac->set_rx_filter_work, set_rx_filter_handler);
 943
 944         SET_IEEE80211_DEV(hw, &intf->dev);
 945         return hw;
 946 }
 947
 948 #define LINK_LED_WORK_DELAY HZ
 949
 950 static void link_led_handler(struct work_struct *work)
 951 {
 952         struct zd_mac *mac =
 953                 container_of(work, struct zd_mac, housekeeping.link_led_work.work);
 954         struct zd_chip *chip = &mac->chip;
 955         int is_associated;
 956         int r;
 957
 958         spin_lock_irq(&mac->lock);
 959         is_associated = mac->associated;
 960         spin_unlock_irq(&mac->lock);
 961
 962         r = zd_chip_control_leds(chip,
 963                                  is_associated ? LED_ASSOCIATED : LED_SCANNING);
 964         if (r)
 965                 dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
 966
 967         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
 968                            LINK_LED_WORK_DELAY);
 969 }
 970
 971 static void housekeeping_init(struct zd_mac *mac)
 972 {
 973         INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler);
 974 }
 975
 976 static void housekeeping_enable(struct zd_mac *mac)
 977 {
 978         dev_dbg_f(zd_mac_dev(mac), "\n");
 979         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
 980                            0);
 981 }
 982
 983 static void housekeeping_disable(struct zd_mac *mac)
 984 {
 985         dev_dbg_f(zd_mac_dev(mac), "\n");
 986         cancel_rearming_delayed_workqueue(zd_workqueue,
 987                 &mac->housekeeping.link_led_work);
 988         zd_chip_control_leds(&mac->chip, LED_OFF);
 989 }