drivers/net/wireless/mwifiex/util.c

   1 /*
   2  * Marvell Wireless LAN device driver: utility functions
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "wmm.h"
  26 #include "11n.h"
  27
  28 static struct mwifiex_debug_data items[] = {
  29         {"int_counter", item_size(int_counter),
  30          item_addr(int_counter), 1},
  31         {"wmm_ac_vo", item_size(packets_out[WMM_AC_VO]),
  32          item_addr(packets_out[WMM_AC_VO]), 1},
  33         {"wmm_ac_vi", item_size(packets_out[WMM_AC_VI]),
  34          item_addr(packets_out[WMM_AC_VI]), 1},
  35         {"wmm_ac_be", item_size(packets_out[WMM_AC_BE]),
  36          item_addr(packets_out[WMM_AC_BE]), 1},
  37         {"wmm_ac_bk", item_size(packets_out[WMM_AC_BK]),
  38          item_addr(packets_out[WMM_AC_BK]), 1},
  39         {"tx_buf_size", item_size(tx_buf_size),
  40          item_addr(tx_buf_size), 1},
  41         {"curr_tx_buf_size", item_size(curr_tx_buf_size),
  42          item_addr(curr_tx_buf_size), 1},
  43         {"ps_mode", item_size(ps_mode),
  44          item_addr(ps_mode), 1},
  45         {"ps_state", item_size(ps_state),
  46          item_addr(ps_state), 1},
  47         {"is_deep_sleep", item_size(is_deep_sleep),
  48          item_addr(is_deep_sleep), 1},
  49         {"wakeup_dev_req", item_size(pm_wakeup_card_req),
  50          item_addr(pm_wakeup_card_req), 1},
  51         {"wakeup_tries", item_size(pm_wakeup_fw_try),
  52          item_addr(pm_wakeup_fw_try), 1},
  53         {"hs_configured", item_size(is_hs_configured),
  54          item_addr(is_hs_configured), 1},
  55         {"hs_activated", item_size(hs_activated),
  56          item_addr(hs_activated), 1},
  57         {"num_tx_timeout", item_size(num_tx_timeout),
  58          item_addr(num_tx_timeout), 1},
  59         {"is_cmd_timedout", item_size(is_cmd_timedout),
  60          item_addr(is_cmd_timedout), 1},
  61         {"timeout_cmd_id", item_size(timeout_cmd_id),
  62          item_addr(timeout_cmd_id), 1},
  63         {"timeout_cmd_act", item_size(timeout_cmd_act),
  64          item_addr(timeout_cmd_act), 1},
  65         {"last_cmd_id", item_size(last_cmd_id),
  66          item_addr(last_cmd_id), DBG_CMD_NUM},
  67         {"last_cmd_act", item_size(last_cmd_act),
  68          item_addr(last_cmd_act), DBG_CMD_NUM},
  69         {"last_cmd_index", item_size(last_cmd_index),
  70          item_addr(last_cmd_index), 1},
  71         {"last_cmd_resp_id", item_size(last_cmd_resp_id),
  72          item_addr(last_cmd_resp_id), DBG_CMD_NUM},
  73         {"last_cmd_resp_index", item_size(last_cmd_resp_index),
  74          item_addr(last_cmd_resp_index), 1},
  75         {"last_event", item_size(last_event),
  76          item_addr(last_event), DBG_CMD_NUM},
  77         {"last_event_index", item_size(last_event_index),
  78          item_addr(last_event_index), 1},
  79         {"num_cmd_h2c_fail", item_size(num_cmd_host_to_card_failure),
  80          item_addr(num_cmd_host_to_card_failure), 1},
  81         {"num_cmd_sleep_cfm_fail",
  82          item_size(num_cmd_sleep_cfm_host_to_card_failure),
  83          item_addr(num_cmd_sleep_cfm_host_to_card_failure), 1},
  84         {"num_tx_h2c_fail", item_size(num_tx_host_to_card_failure),
  85          item_addr(num_tx_host_to_card_failure), 1},
  86         {"num_evt_deauth", item_size(num_event_deauth),
  87          item_addr(num_event_deauth), 1},
  88         {"num_evt_disassoc", item_size(num_event_disassoc),
  89          item_addr(num_event_disassoc), 1},
  90         {"num_evt_link_lost", item_size(num_event_link_lost),
  91          item_addr(num_event_link_lost), 1},
  92         {"num_cmd_deauth", item_size(num_cmd_deauth),
  93          item_addr(num_cmd_deauth), 1},
  94         {"num_cmd_assoc_ok", item_size(num_cmd_assoc_success),
  95          item_addr(num_cmd_assoc_success), 1},
  96         {"num_cmd_assoc_fail", item_size(num_cmd_assoc_failure),
  97          item_addr(num_cmd_assoc_failure), 1},
  98         {"cmd_sent", item_size(cmd_sent),
  99          item_addr(cmd_sent), 1},
 100         {"data_sent", item_size(data_sent),
 101          item_addr(data_sent), 1},
 102         {"cmd_resp_received", item_size(cmd_resp_received),
 103          item_addr(cmd_resp_received), 1},
 104         {"event_received", item_size(event_received),
 105          item_addr(event_received), 1},
 106
 107         /* variables defined in struct mwifiex_adapter */
 108         {"cmd_pending", adapter_item_size(cmd_pending),
 109          adapter_item_addr(cmd_pending), 1},
 110         {"tx_pending", adapter_item_size(tx_pending),
 111          adapter_item_addr(tx_pending), 1},
 112         {"rx_pending", adapter_item_size(rx_pending),
 113          adapter_item_addr(rx_pending), 1},
 114 };
 115
 116 static int num_of_items = ARRAY_SIZE(items);
 117
 118 /*
 119  * Firmware initialization complete callback handler.
 120  *
 121  * This function wakes up the function waiting on the init
 122  * wait queue for the firmware initialization to complete.
 123  */
 124 int mwifiex_init_fw_complete(struct mwifiex_adapter *adapter)
 125 {
 126
 127         adapter->init_wait_q_woken = true;
 128         wake_up_interruptible(&adapter->init_wait_q);
 129         return 0;
 130 }
 131
 132 /*
 133  * Firmware shutdown complete callback handler.
 134  *
 135  * This function sets the hardware status to not ready and wakes up
 136  * the function waiting on the init wait queue for the firmware
 137  * shutdown to complete.
 138  */
 139 int mwifiex_shutdown_fw_complete(struct mwifiex_adapter *adapter)
 140 {
 141         adapter->hw_status = MWIFIEX_HW_STATUS_NOT_READY;
 142         adapter->init_wait_q_woken = true;
 143         wake_up_interruptible(&adapter->init_wait_q);
 144         return 0;
 145 }
 146
 147 /*
 148  * This function sends init/shutdown command
 149  * to firmware.
 150  */
 151 int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
 152                              u32 func_init_shutdown)
 153 {
 154         u16 cmd;
 155
 156         if (func_init_shutdown == MWIFIEX_FUNC_INIT) {
 157                 cmd = HostCmd_CMD_FUNC_INIT;
 158         } else if (func_init_shutdown == MWIFIEX_FUNC_SHUTDOWN) {
 159                 cmd = HostCmd_CMD_FUNC_SHUTDOWN;
 160         } else {
 161                 dev_err(priv->adapter->dev, "unsupported parameter\n");
 162                 return -1;
 163         }
 164
 165         return mwifiex_send_cmd(priv, cmd, HostCmd_ACT_GEN_SET, 0, NULL, true);
 166 }
 167 EXPORT_SYMBOL_GPL(mwifiex_init_shutdown_fw);
 168
 169 /*
 170  * IOCTL request handler to set/get debug information.
 171  *
 172  * This function collates/sets the information from/to different driver
 173  * structures.
 174  */
 175 int mwifiex_get_debug_info(struct mwifiex_private *priv,
 176                            struct mwifiex_debug_info *info)
 177 {
 178         struct mwifiex_adapter *adapter = priv->adapter;
 179
 180         if (info) {
 181                 memcpy(info->packets_out,
 182                        priv->wmm.packets_out,
 183                        sizeof(priv->wmm.packets_out));
 184                 info->curr_tx_buf_size = (u32) adapter->curr_tx_buf_size;
 185                 info->tx_buf_size = (u32) adapter->tx_buf_size;
 186                 info->rx_tbl_num = mwifiex_get_rx_reorder_tbl(priv,
 187                                                               info->rx_tbl);
 188                 info->tx_tbl_num = mwifiex_get_tx_ba_stream_tbl(priv,
 189                                                                 info->tx_tbl);
 190                 info->tdls_peer_num = mwifiex_get_tdls_list(priv,
 191                                                             info->tdls_list);
 192                 info->ps_mode = adapter->ps_mode;
 193                 info->ps_state = adapter->ps_state;
 194                 info->is_deep_sleep = adapter->is_deep_sleep;
 195                 info->pm_wakeup_card_req = adapter->pm_wakeup_card_req;
 196                 info->pm_wakeup_fw_try = adapter->pm_wakeup_fw_try;
 197                 info->is_hs_configured = adapter->is_hs_configured;
 198                 info->hs_activated = adapter->hs_activated;
 199                 info->is_cmd_timedout = adapter->is_cmd_timedout;
 200                 info->num_cmd_host_to_card_failure
 201                                 = adapter->dbg.num_cmd_host_to_card_failure;
 202                 info->num_cmd_sleep_cfm_host_to_card_failure
 203                         = adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure;
 204                 info->num_tx_host_to_card_failure
 205                                 = adapter->dbg.num_tx_host_to_card_failure;
 206                 info->num_event_deauth = adapter->dbg.num_event_deauth;
 207                 info->num_event_disassoc = adapter->dbg.num_event_disassoc;
 208                 info->num_event_link_lost = adapter->dbg.num_event_link_lost;
 209                 info->num_cmd_deauth = adapter->dbg.num_cmd_deauth;
 210                 info->num_cmd_assoc_success =
 211                                         adapter->dbg.num_cmd_assoc_success;
 212                 info->num_cmd_assoc_failure =
 213                                         adapter->dbg.num_cmd_assoc_failure;
 214                 info->num_tx_timeout = adapter->dbg.num_tx_timeout;
 215                 info->timeout_cmd_id = adapter->dbg.timeout_cmd_id;
 216                 info->timeout_cmd_act = adapter->dbg.timeout_cmd_act;
 217                 memcpy(info->last_cmd_id, adapter->dbg.last_cmd_id,
 218                        sizeof(adapter->dbg.last_cmd_id));
 219                 memcpy(info->last_cmd_act, adapter->dbg.last_cmd_act,
 220                        sizeof(adapter->dbg.last_cmd_act));
 221                 info->last_cmd_index = adapter->dbg.last_cmd_index;
 222                 memcpy(info->last_cmd_resp_id, adapter->dbg.last_cmd_resp_id,
 223                        sizeof(adapter->dbg.last_cmd_resp_id));
 224                 info->last_cmd_resp_index = adapter->dbg.last_cmd_resp_index;
 225                 memcpy(info->last_event, adapter->dbg.last_event,
 226                        sizeof(adapter->dbg.last_event));
 227                 info->last_event_index = adapter->dbg.last_event_index;
 228                 info->data_sent = adapter->data_sent;
 229                 info->cmd_sent = adapter->cmd_sent;
 230                 info->cmd_resp_received = adapter->cmd_resp_received;
 231         }
 232
 233         return 0;
 234 }
 235
 236 int mwifiex_debug_info_to_buffer(struct mwifiex_private *priv, char *buf,
 237                                  struct mwifiex_debug_info *info)
 238 {
 239         char *p = buf;
 240         struct mwifiex_debug_data *d = &items[0];
 241         size_t size, addr;
 242         long val;
 243         int i, j;
 244
 245         if (!info)
 246                 return 0;
 247
 248         for (i = 0; i < num_of_items; i++) {
 249                 p += sprintf(p, "%s=", d[i].name);
 250
 251                 size = d[i].size / d[i].num;
 252
 253                 if (i < (num_of_items - 3))
 254                         addr = d[i].addr + (size_t)info;
 255                 else /* The last 3 items are struct mwifiex_adapter variables */
 256                         addr = d[i].addr + (size_t)priv->adapter;
 257
 258                 for (j = 0; j < d[i].num; j++) {
 259                         switch (size) {
 260                         case 1:
 261                                 val = *((u8 *)addr);
 262                                 break;
 263                         case 2:
 264                                 val = *((u16 *)addr);
 265                                 break;
 266                         case 4:
 267                                 val = *((u32 *)addr);
 268                                 break;
 269                         case 8:
 270                                 val = *((long long *)addr);
 271                                 break;
 272                         default:
 273                                 val = -1;
 274                                 break;
 275                         }
 276
 277                         p += sprintf(p, "%#lx ", val);
 278                         addr += size;
 279                 }
 280
 281                 p += sprintf(p, "\n");
 282         }
 283
 284         if (info->tx_tbl_num) {
 285                 p += sprintf(p, "Tx BA stream table:\n");
 286                 for (i = 0; i < info->tx_tbl_num; i++)
 287                         p += sprintf(p, "tid = %d, ra = %pM\n",
 288                                      info->tx_tbl[i].tid, info->tx_tbl[i].ra);
 289         }
 290
 291         if (info->rx_tbl_num) {
 292                 p += sprintf(p, "Rx reorder table:\n");
 293                 for (i = 0; i < info->rx_tbl_num; i++) {
 294                         p += sprintf(p, "tid = %d, ta = %pM, ",
 295                                      info->rx_tbl[i].tid,
 296                                      info->rx_tbl[i].ta);
 297                         p += sprintf(p, "start_win = %d, ",
 298                                      info->rx_tbl[i].start_win);
 299                         p += sprintf(p, "win_size = %d, buffer: ",
 300                                      info->rx_tbl[i].win_size);
 301
 302                         for (j = 0; j < info->rx_tbl[i].win_size; j++)
 303                                 p += sprintf(p, "%c ",
 304                                              info->rx_tbl[i].buffer[j] ?
 305                                              '1' : '0');
 306
 307                         p += sprintf(p, "\n");
 308                 }
 309         }
 310
 311         if (info->tdls_peer_num) {
 312                 p += sprintf(p, "TDLS peer table:\n");
 313                 for (i = 0; i < info->tdls_peer_num; i++) {
 314                         p += sprintf(p, "peer = %pM",
 315                                      info->tdls_list[i].peer_addr);
 316                         p += sprintf(p, "\n");
 317                 }
 318         }
 319
 320         return p - buf;
 321 }
 322
 323 static int
 324 mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
 325                           struct rxpd *rx_pd)
 326 {
 327         u16 stype;
 328         u8 category, action_code;
 329         struct ieee80211_hdr *ieee_hdr = (void *)payload;
 330
 331         stype = (le16_to_cpu(ieee_hdr->frame_control) & IEEE80211_FCTL_STYPE);
 332
 333         switch (stype) {
 334         case IEEE80211_STYPE_ACTION:
 335                 category = *(payload + sizeof(struct ieee80211_hdr));
 336                 action_code = *(payload + sizeof(struct ieee80211_hdr) + 1);
 337                 if (category == WLAN_CATEGORY_PUBLIC &&
 338                     action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 339                         dev_dbg(priv->adapter->dev,
 340                                 "TDLS discovery response %pM nf=%d, snr=%d\n",
 341                                 ieee_hdr->addr2, rx_pd->nf, rx_pd->snr);
 342                         mwifiex_auto_tdls_update_peer_signal(priv,
 343                                                              ieee_hdr->addr2,
 344                                                              rx_pd->snr,
 345                                                              rx_pd->nf);
 346                 }
 347                 break;
 348         default:
 349                 dev_dbg(priv->adapter->dev,
 350                         "unknown mgmt frame subytpe %#x\n", stype);
 351         }
 352
 353         return 0;
 354 }
 355 /*
 356  * This function processes the received management packet and send it
 357  * to the kernel.
 358  */
 359 int
 360 mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
 361                             struct sk_buff *skb)
 362 {
 363         struct rxpd *rx_pd;
 364         u16 pkt_len;
 365         struct ieee80211_hdr *ieee_hdr;
 366
 367         if (!skb)
 368                 return -1;
 369
 370         rx_pd = (struct rxpd *)skb->data;
 371
 372         skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
 373         skb_pull(skb, sizeof(pkt_len));
 374
 375         pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
 376
 377         ieee_hdr = (void *)skb->data;
 378         if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
 379                 mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
 380                                           pkt_len, rx_pd);
 381         }
 382         /* Remove address4 */
 383         memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),
 384                 skb->data + sizeof(struct ieee80211_hdr),
 385                 pkt_len - sizeof(struct ieee80211_hdr));
 386
 387         pkt_len -= ETH_ALEN + sizeof(pkt_len);
 388         rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);
 389
 390         cfg80211_rx_mgmt(priv->wdev, priv->roc_cfg.chan.center_freq,
 391                          CAL_RSSI(rx_pd->snr, rx_pd->nf), skb->data, pkt_len,
 392                          0);
 393
 394         return 0;
 395 }
 396
 397 /*
 398  * This function processes the received packet before sending it to the
 399  * kernel.
 400  *
 401  * It extracts the SKB from the received buffer and sends it to kernel.
 402  * In case the received buffer does not contain the data in SKB format,
 403  * the function creates a blank SKB, fills it with the data from the
 404  * received buffer and then sends this new SKB to the kernel.
 405  */
 406 int mwifiex_recv_packet(struct mwifiex_private *priv, struct sk_buff *skb)
 407 {
 408         if (!skb)
 409                 return -1;
 410
 411         priv->stats.rx_bytes += skb->len;
 412         priv->stats.rx_packets++;
 413
 414         skb->dev = priv->netdev;
 415         skb->protocol = eth_type_trans(skb, priv->netdev);
 416         skb->ip_summed = CHECKSUM_NONE;
 417
 418         /* This is required only in case of 11n and USB/PCIE as we alloc
 419          * a buffer of 4K only if its 11N (to be able to receive 4K
 420          * AMSDU packets). In case of SD we allocate buffers based
 421          * on the size of packet and hence this is not needed.
 422          *
 423          * Modifying the truesize here as our allocation for each
 424          * skb is 4K but we only receive 2K packets and this cause
 425          * the kernel to start dropping packets in case where
 426          * application has allocated buffer based on 2K size i.e.
 427          * if there a 64K packet received (in IP fragments and
 428          * application allocates 64K to receive this packet but
 429          * this packet would almost double up because we allocate
 430          * each 1.5K fragment in 4K and pass it up. As soon as the
 431          * 64K limit hits kernel will start to drop rest of the
 432          * fragments. Currently we fail the Filesndl-ht.scr script
 433          * for UDP, hence this fix
 434          */
 435         if ((priv->adapter->iface_type == MWIFIEX_USB ||
 436              priv->adapter->iface_type == MWIFIEX_PCIE) &&
 437             (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
 438                 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
 439
 440         if (in_interrupt())
 441                 netif_rx(skb);
 442         else
 443                 netif_rx_ni(skb);
 444
 445         return 0;
 446 }
 447
 448 /*
 449  * IOCTL completion callback handler.
 450  *
 451  * This function is called when a pending IOCTL is completed.
 452  *
 453  * If work queue support is enabled, the function wakes up the
 454  * corresponding waiting function. Otherwise, it processes the
 455  * IOCTL response and frees the response buffer.
 456  */
 457 int mwifiex_complete_cmd(struct mwifiex_adapter *adapter,
 458                          struct cmd_ctrl_node *cmd_node)
 459 {
 460         dev_dbg(adapter->dev, "cmd completed: status=%d\n",
 461                 adapter->cmd_wait_q.status);
 462
 463         *(cmd_node->condition) = true;
 464
 465         if (adapter->cmd_wait_q.status == -ETIMEDOUT)
 466                 dev_err(adapter->dev, "cmd timeout\n");
 467         else
 468                 wake_up_interruptible(&adapter->cmd_wait_q.wait);
 469
 470         return 0;
 471 }
 472
 473 /* This function will return the pointer to station entry in station list
 474  * table which matches specified mac address.
 475  * This function should be called after acquiring RA list spinlock.
 476  * NULL is returned if station entry is not found in associated STA list.
 477  */
 478 struct mwifiex_sta_node *
 479 mwifiex_get_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 480 {
 481         struct mwifiex_sta_node *node;
 482
 483         if (!mac)
 484                 return NULL;
 485
 486         list_for_each_entry(node, &priv->sta_list, list) {
 487                 if (!memcmp(node->mac_addr, mac, ETH_ALEN))
 488                         return node;
 489         }
 490
 491         return NULL;
 492 }
 493
 494 /* This function will add a sta_node entry to associated station list
 495  * table with the given mac address.
 496  * If entry exist already, existing entry is returned.
 497  * If received mac address is NULL, NULL is returned.
 498  */
 499 struct mwifiex_sta_node *
 500 mwifiex_add_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 501 {
 502         struct mwifiex_sta_node *node;
 503         unsigned long flags;
 504
 505         if (!mac)
 506                 return NULL;
 507
 508         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 509         node = mwifiex_get_sta_entry(priv, mac);
 510         if (node)
 511                 goto done;
 512
 513         node = kzalloc(sizeof(*node), GFP_ATOMIC);
 514         if (!node)
 515                 goto done;
 516
 517         memcpy(node->mac_addr, mac, ETH_ALEN);
 518         list_add_tail(&node->list, &priv->sta_list);
 519
 520 done:
 521         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 522         return node;
 523 }
 524
 525 /* This function will search for HT IE in association request IEs
 526  * and set station HT parameters accordingly.
 527  */
 528 void
 529 mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
 530                        int ies_len, struct mwifiex_sta_node *node)
 531 {
 532         const struct ieee80211_ht_cap *ht_cap;
 533
 534         if (!ies)
 535                 return;
 536
 537         ht_cap = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies, ies_len);
 538         if (ht_cap) {
 539                 node->is_11n_enabled = 1;
 540                 node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
 541                                   IEEE80211_HT_CAP_MAX_AMSDU ?
 542                                   MWIFIEX_TX_DATA_BUF_SIZE_8K :
 543                                   MWIFIEX_TX_DATA_BUF_SIZE_4K;
 544         } else {
 545                 node->is_11n_enabled = 0;
 546         }
 547
 548         return;
 549 }
 550
 551 /* This function will delete a station entry from station list */
 552 void mwifiex_del_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 553 {
 554         struct mwifiex_sta_node *node;
 555         unsigned long flags;
 556
 557         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 558
 559         node = mwifiex_get_sta_entry(priv, mac);
 560         if (node) {
 561                 list_del(&node->list);
 562                 kfree(node);
 563         }
 564
 565         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 566         return;
 567 }
 568
 569 /* This function will delete all stations from associated station list. */
 570 void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
 571 {
 572         struct mwifiex_sta_node *node, *tmp;
 573         unsigned long flags;
 574
 575         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 576
 577         list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
 578                 list_del(&node->list);
 579                 kfree(node);
 580         }
 581
 582         INIT_LIST_HEAD(&priv->sta_list);
 583         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 584         return;
 585 }
 586
 587 /* This function adds histogram data to histogram array*/
 588 void mwifiex_hist_data_add(struct mwifiex_private *priv,
 589                            u8 rx_rate, s8 snr, s8 nflr)
 590 {
 591         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 592
 593         if (atomic_read(&phist_data->num_samples) > MWIFIEX_HIST_MAX_SAMPLES)
 594                 mwifiex_hist_data_reset(priv);
 595         mwifiex_hist_data_set(priv, rx_rate, snr, nflr);
 596 }
 597
 598 /* function to add histogram record */
 599 void mwifiex_hist_data_set(struct mwifiex_private *priv, u8 rx_rate, s8 snr,
 600                            s8 nflr)
 601 {
 602         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 603
 604         atomic_inc(&phist_data->num_samples);
 605         atomic_inc(&phist_data->rx_rate[rx_rate]);
 606         atomic_inc(&phist_data->snr[snr]);
 607         atomic_inc(&phist_data->noise_flr[128 + nflr]);
 608         atomic_inc(&phist_data->sig_str[nflr - snr]);
 609 }
 610
 611 /* function to reset histogram data during init/reset */
 612 void mwifiex_hist_data_reset(struct mwifiex_private *priv)
 613 {
 614         int ix;
 615         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 616
 617         atomic_set(&phist_data->num_samples, 0);
 618         for (ix = 0; ix < MWIFIEX_MAX_AC_RX_RATES; ix++)
 619                 atomic_set(&phist_data->rx_rate[ix], 0);
 620         for (ix = 0; ix < MWIFIEX_MAX_SNR; ix++)
 621                 atomic_set(&phist_data->snr[ix], 0);
 622         for (ix = 0; ix < MWIFIEX_MAX_NOISE_FLR; ix++)
 623                 atomic_set(&phist_data->noise_flr[ix], 0);
 624         for (ix = 0; ix < MWIFIEX_MAX_SIG_STRENGTH; ix++)
 625                 atomic_set(&phist_data->sig_str[ix], 0);
 626 }