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         {"debug_mask", item_size(debug_mask),
  30          item_addr(debug_mask), 1},
  31         {"int_counter", item_size(int_counter),
  32          item_addr(int_counter), 1},
  33         {"wmm_ac_vo", item_size(packets_out[WMM_AC_VO]),
  34          item_addr(packets_out[WMM_AC_VO]), 1},
  35         {"wmm_ac_vi", item_size(packets_out[WMM_AC_VI]),
  36          item_addr(packets_out[WMM_AC_VI]), 1},
  37         {"wmm_ac_be", item_size(packets_out[WMM_AC_BE]),
  38          item_addr(packets_out[WMM_AC_BE]), 1},
  39         {"wmm_ac_bk", item_size(packets_out[WMM_AC_BK]),
  40          item_addr(packets_out[WMM_AC_BK]), 1},
  41         {"tx_buf_size", item_size(tx_buf_size),
  42          item_addr(tx_buf_size), 1},
  43         {"curr_tx_buf_size", item_size(curr_tx_buf_size),
  44          item_addr(curr_tx_buf_size), 1},
  45         {"ps_mode", item_size(ps_mode),
  46          item_addr(ps_mode), 1},
  47         {"ps_state", item_size(ps_state),
  48          item_addr(ps_state), 1},
  49         {"is_deep_sleep", item_size(is_deep_sleep),
  50          item_addr(is_deep_sleep), 1},
  51         {"wakeup_dev_req", item_size(pm_wakeup_card_req),
  52          item_addr(pm_wakeup_card_req), 1},
  53         {"wakeup_tries", item_size(pm_wakeup_fw_try),
  54          item_addr(pm_wakeup_fw_try), 1},
  55         {"hs_configured", item_size(is_hs_configured),
  56          item_addr(is_hs_configured), 1},
  57         {"hs_activated", item_size(hs_activated),
  58          item_addr(hs_activated), 1},
  59         {"num_tx_timeout", item_size(num_tx_timeout),
  60          item_addr(num_tx_timeout), 1},
  61         {"is_cmd_timedout", item_size(is_cmd_timedout),
  62          item_addr(is_cmd_timedout), 1},
  63         {"timeout_cmd_id", item_size(timeout_cmd_id),
  64          item_addr(timeout_cmd_id), 1},
  65         {"timeout_cmd_act", item_size(timeout_cmd_act),
  66          item_addr(timeout_cmd_act), 1},
  67         {"last_cmd_id", item_size(last_cmd_id),
  68          item_addr(last_cmd_id), DBG_CMD_NUM},
  69         {"last_cmd_act", item_size(last_cmd_act),
  70          item_addr(last_cmd_act), DBG_CMD_NUM},
  71         {"last_cmd_index", item_size(last_cmd_index),
  72          item_addr(last_cmd_index), 1},
  73         {"last_cmd_resp_id", item_size(last_cmd_resp_id),
  74          item_addr(last_cmd_resp_id), DBG_CMD_NUM},
  75         {"last_cmd_resp_index", item_size(last_cmd_resp_index),
  76          item_addr(last_cmd_resp_index), 1},
  77         {"last_event", item_size(last_event),
  78          item_addr(last_event), DBG_CMD_NUM},
  79         {"last_event_index", item_size(last_event_index),
  80          item_addr(last_event_index), 1},
  81         {"num_cmd_h2c_fail", item_size(num_cmd_host_to_card_failure),
  82          item_addr(num_cmd_host_to_card_failure), 1},
  83         {"num_cmd_sleep_cfm_fail",
  84          item_size(num_cmd_sleep_cfm_host_to_card_failure),
  85          item_addr(num_cmd_sleep_cfm_host_to_card_failure), 1},
  86         {"num_tx_h2c_fail", item_size(num_tx_host_to_card_failure),
  87          item_addr(num_tx_host_to_card_failure), 1},
  88         {"num_evt_deauth", item_size(num_event_deauth),
  89          item_addr(num_event_deauth), 1},
  90         {"num_evt_disassoc", item_size(num_event_disassoc),
  91          item_addr(num_event_disassoc), 1},
  92         {"num_evt_link_lost", item_size(num_event_link_lost),
  93          item_addr(num_event_link_lost), 1},
  94         {"num_cmd_deauth", item_size(num_cmd_deauth),
  95          item_addr(num_cmd_deauth), 1},
  96         {"num_cmd_assoc_ok", item_size(num_cmd_assoc_success),
  97          item_addr(num_cmd_assoc_success), 1},
  98         {"num_cmd_assoc_fail", item_size(num_cmd_assoc_failure),
  99          item_addr(num_cmd_assoc_failure), 1},
 100         {"cmd_sent", item_size(cmd_sent),
 101          item_addr(cmd_sent), 1},
 102         {"data_sent", item_size(data_sent),
 103          item_addr(data_sent), 1},
 104         {"cmd_resp_received", item_size(cmd_resp_received),
 105          item_addr(cmd_resp_received), 1},
 106         {"event_received", item_size(event_received),
 107          item_addr(event_received), 1},
 108
 109         /* variables defined in struct mwifiex_adapter */
 110         {"cmd_pending", adapter_item_size(cmd_pending),
 111          adapter_item_addr(cmd_pending), 1},
 112         {"tx_pending", adapter_item_size(tx_pending),
 113          adapter_item_addr(tx_pending), 1},
 114         {"rx_pending", adapter_item_size(rx_pending),
 115          adapter_item_addr(rx_pending), 1},
 116 };
 117
 118 static int num_of_items = ARRAY_SIZE(items);
 119
 120 /*
 121  * Firmware initialization complete callback handler.
 122  *
 123  * This function wakes up the function waiting on the init
 124  * wait queue for the firmware initialization to complete.
 125  */
 126 int mwifiex_init_fw_complete(struct mwifiex_adapter *adapter)
 127 {
 128
 129         adapter->init_wait_q_woken = true;
 130         wake_up_interruptible(&adapter->init_wait_q);
 131         return 0;
 132 }
 133
 134 /*
 135  * Firmware shutdown complete callback handler.
 136  *
 137  * This function sets the hardware status to not ready and wakes up
 138  * the function waiting on the init wait queue for the firmware
 139  * shutdown to complete.
 140  */
 141 int mwifiex_shutdown_fw_complete(struct mwifiex_adapter *adapter)
 142 {
 143         adapter->hw_status = MWIFIEX_HW_STATUS_NOT_READY;
 144         adapter->init_wait_q_woken = true;
 145         wake_up_interruptible(&adapter->init_wait_q);
 146         return 0;
 147 }
 148
 149 /*
 150  * This function sends init/shutdown command
 151  * to firmware.
 152  */
 153 int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
 154                              u32 func_init_shutdown)
 155 {
 156         u16 cmd;
 157
 158         if (func_init_shutdown == MWIFIEX_FUNC_INIT) {
 159                 cmd = HostCmd_CMD_FUNC_INIT;
 160         } else if (func_init_shutdown == MWIFIEX_FUNC_SHUTDOWN) {
 161                 cmd = HostCmd_CMD_FUNC_SHUTDOWN;
 162         } else {
 163                 mwifiex_dbg(priv->adapter, ERROR,
 164                             "unsupported parameter\n");
 165                 return -1;
 166         }
 167
 168         return mwifiex_send_cmd(priv, cmd, HostCmd_ACT_GEN_SET, 0, NULL, true);
 169 }
 170 EXPORT_SYMBOL_GPL(mwifiex_init_shutdown_fw);
 171
 172 /*
 173  * IOCTL request handler to set/get debug information.
 174  *
 175  * This function collates/sets the information from/to different driver
 176  * structures.
 177  */
 178 int mwifiex_get_debug_info(struct mwifiex_private *priv,
 179                            struct mwifiex_debug_info *info)
 180 {
 181         struct mwifiex_adapter *adapter = priv->adapter;
 182
 183         if (info) {
 184                 info->debug_mask = adapter->debug_mask;
 185                 memcpy(info->packets_out,
 186                        priv->wmm.packets_out,
 187                        sizeof(priv->wmm.packets_out));
 188                 info->curr_tx_buf_size = (u32) adapter->curr_tx_buf_size;
 189                 info->tx_buf_size = (u32) adapter->tx_buf_size;
 190                 info->rx_tbl_num = mwifiex_get_rx_reorder_tbl(priv,
 191                                                               info->rx_tbl);
 192                 info->tx_tbl_num = mwifiex_get_tx_ba_stream_tbl(priv,
 193                                                                 info->tx_tbl);
 194                 info->tdls_peer_num = mwifiex_get_tdls_list(priv,
 195                                                             info->tdls_list);
 196                 info->ps_mode = adapter->ps_mode;
 197                 info->ps_state = adapter->ps_state;
 198                 info->is_deep_sleep = adapter->is_deep_sleep;
 199                 info->pm_wakeup_card_req = adapter->pm_wakeup_card_req;
 200                 info->pm_wakeup_fw_try = adapter->pm_wakeup_fw_try;
 201                 info->is_hs_configured = adapter->is_hs_configured;
 202                 info->hs_activated = adapter->hs_activated;
 203                 info->is_cmd_timedout = adapter->is_cmd_timedout;
 204                 info->num_cmd_host_to_card_failure
 205                                 = adapter->dbg.num_cmd_host_to_card_failure;
 206                 info->num_cmd_sleep_cfm_host_to_card_failure
 207                         = adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure;
 208                 info->num_tx_host_to_card_failure
 209                                 = adapter->dbg.num_tx_host_to_card_failure;
 210                 info->num_event_deauth = adapter->dbg.num_event_deauth;
 211                 info->num_event_disassoc = adapter->dbg.num_event_disassoc;
 212                 info->num_event_link_lost = adapter->dbg.num_event_link_lost;
 213                 info->num_cmd_deauth = adapter->dbg.num_cmd_deauth;
 214                 info->num_cmd_assoc_success =
 215                                         adapter->dbg.num_cmd_assoc_success;
 216                 info->num_cmd_assoc_failure =
 217                                         adapter->dbg.num_cmd_assoc_failure;
 218                 info->num_tx_timeout = adapter->dbg.num_tx_timeout;
 219                 info->timeout_cmd_id = adapter->dbg.timeout_cmd_id;
 220                 info->timeout_cmd_act = adapter->dbg.timeout_cmd_act;
 221                 memcpy(info->last_cmd_id, adapter->dbg.last_cmd_id,
 222                        sizeof(adapter->dbg.last_cmd_id));
 223                 memcpy(info->last_cmd_act, adapter->dbg.last_cmd_act,
 224                        sizeof(adapter->dbg.last_cmd_act));
 225                 info->last_cmd_index = adapter->dbg.last_cmd_index;
 226                 memcpy(info->last_cmd_resp_id, adapter->dbg.last_cmd_resp_id,
 227                        sizeof(adapter->dbg.last_cmd_resp_id));
 228                 info->last_cmd_resp_index = adapter->dbg.last_cmd_resp_index;
 229                 memcpy(info->last_event, adapter->dbg.last_event,
 230                        sizeof(adapter->dbg.last_event));
 231                 info->last_event_index = adapter->dbg.last_event_index;
 232                 info->data_sent = adapter->data_sent;
 233                 info->cmd_sent = adapter->cmd_sent;
 234                 info->cmd_resp_received = adapter->cmd_resp_received;
 235         }
 236
 237         return 0;
 238 }
 239
 240 int mwifiex_debug_info_to_buffer(struct mwifiex_private *priv, char *buf,
 241                                  struct mwifiex_debug_info *info)
 242 {
 243         char *p = buf;
 244         struct mwifiex_debug_data *d = &items[0];
 245         size_t size, addr;
 246         long val;
 247         int i, j;
 248
 249         if (!info)
 250                 return 0;
 251
 252         for (i = 0; i < num_of_items; i++) {
 253                 p += sprintf(p, "%s=", d[i].name);
 254
 255                 size = d[i].size / d[i].num;
 256
 257                 if (i < (num_of_items - 3))
 258                         addr = d[i].addr + (size_t)info;
 259                 else /* The last 3 items are struct mwifiex_adapter variables */
 260                         addr = d[i].addr + (size_t)priv->adapter;
 261
 262                 for (j = 0; j < d[i].num; j++) {
 263                         switch (size) {
 264                         case 1:
 265                                 val = *((u8 *)addr);
 266                                 break;
 267                         case 2:
 268                                 val = *((u16 *)addr);
 269                                 break;
 270                         case 4:
 271                                 val = *((u32 *)addr);
 272                                 break;
 273                         case 8:
 274                                 val = *((long long *)addr);
 275                                 break;
 276                         default:
 277                                 val = -1;
 278                                 break;
 279                         }
 280
 281                         p += sprintf(p, "%#lx ", val);
 282                         addr += size;
 283                 }
 284
 285                 p += sprintf(p, "\n");
 286         }
 287
 288         if (info->tx_tbl_num) {
 289                 p += sprintf(p, "Tx BA stream table:\n");
 290                 for (i = 0; i < info->tx_tbl_num; i++)
 291                         p += sprintf(p, "tid = %d, ra = %pM\n",
 292                                      info->tx_tbl[i].tid, info->tx_tbl[i].ra);
 293         }
 294
 295         if (info->rx_tbl_num) {
 296                 p += sprintf(p, "Rx reorder table:\n");
 297                 for (i = 0; i < info->rx_tbl_num; i++) {
 298                         p += sprintf(p, "tid = %d, ta = %pM, ",
 299                                      info->rx_tbl[i].tid,
 300                                      info->rx_tbl[i].ta);
 301                         p += sprintf(p, "start_win = %d, ",
 302                                      info->rx_tbl[i].start_win);
 303                         p += sprintf(p, "win_size = %d, buffer: ",
 304                                      info->rx_tbl[i].win_size);
 305
 306                         for (j = 0; j < info->rx_tbl[i].win_size; j++)
 307                                 p += sprintf(p, "%c ",
 308                                              info->rx_tbl[i].buffer[j] ?
 309                                              '1' : '0');
 310
 311                         p += sprintf(p, "\n");
 312                 }
 313         }
 314
 315         if (info->tdls_peer_num) {
 316                 p += sprintf(p, "TDLS peer table:\n");
 317                 for (i = 0; i < info->tdls_peer_num; i++) {
 318                         p += sprintf(p, "peer = %pM",
 319                                      info->tdls_list[i].peer_addr);
 320                         p += sprintf(p, "\n");
 321                 }
 322         }
 323
 324         return p - buf;
 325 }
 326
 327 static int
 328 mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
 329                           struct rxpd *rx_pd)
 330 {
 331         u16 stype;
 332         u8 category, action_code, *addr2;
 333         struct ieee80211_hdr *ieee_hdr = (void *)payload;
 334
 335         stype = (le16_to_cpu(ieee_hdr->frame_control) & IEEE80211_FCTL_STYPE);
 336
 337         switch (stype) {
 338         case IEEE80211_STYPE_ACTION:
 339                 category = *(payload + sizeof(struct ieee80211_hdr));
 340                 switch (category) {
 341                 case WLAN_CATEGORY_PUBLIC:
 342                         action_code = *(payload + sizeof(struct ieee80211_hdr)
 343                                         + 1);
 344                         if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
 345                                 addr2 = ieee_hdr->addr2;
 346                                 mwifiex_dbg(priv->adapter, INFO,
 347                                             "TDLS discovery response %pM nf=%d, snr=%d\n",
 348                                             addr2, rx_pd->nf, rx_pd->snr);
 349                                 mwifiex_auto_tdls_update_peer_signal(priv,
 350                                                                      addr2,
 351                                                                      rx_pd->snr,
 352                                                                      rx_pd->nf);
 353                         }
 354                         break;
 355                 case WLAN_CATEGORY_BACK:
 356                         /*we dont indicate BACK action frames to cfg80211*/
 357                         mwifiex_dbg(priv->adapter, INFO,
 358                                     "drop BACK action frames");
 359                         return -1;
 360                 default:
 361                         mwifiex_dbg(priv->adapter, INFO,
 362                                     "unknown public action frame category %d\n",
 363                                     category);
 364                 }
 365         default:
 366                 mwifiex_dbg(priv->adapter, INFO,
 367                     "unknown mgmt frame subtype %#x\n", stype);
 368                 return 0;
 369         }
 370
 371         return 0;
 372 }
 373 /*
 374  * This function processes the received management packet and send it
 375  * to the kernel.
 376  */
 377 int
 378 mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
 379                             struct sk_buff *skb)
 380 {
 381         struct rxpd *rx_pd;
 382         u16 pkt_len;
 383         struct ieee80211_hdr *ieee_hdr;
 384
 385         if (!skb)
 386                 return -1;
 387
 388         if (!priv->mgmt_frame_mask ||
 389             priv->wdev.iftype == NL80211_IFTYPE_UNSPECIFIED) {
 390                 mwifiex_dbg(priv->adapter, ERROR,
 391                             "do not receive mgmt frames on uninitialized intf");
 392                 return -1;
 393         }
 394
 395         rx_pd = (struct rxpd *)skb->data;
 396
 397         skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
 398         skb_pull(skb, sizeof(pkt_len));
 399
 400         pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
 401
 402         ieee_hdr = (void *)skb->data;
 403         if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
 404                 if (mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
 405                                               pkt_len, rx_pd))
 406                         return -1;
 407         }
 408         /* Remove address4 */
 409         memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),
 410                 skb->data + sizeof(struct ieee80211_hdr),
 411                 pkt_len - sizeof(struct ieee80211_hdr));
 412
 413         pkt_len -= ETH_ALEN + sizeof(pkt_len);
 414         rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);
 415
 416         cfg80211_rx_mgmt(&priv->wdev, priv->roc_cfg.chan.center_freq,
 417                          CAL_RSSI(rx_pd->snr, rx_pd->nf), skb->data, pkt_len,
 418                          0);
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * This function processes the received packet before sending it to the
 425  * kernel.
 426  *
 427  * It extracts the SKB from the received buffer and sends it to kernel.
 428  * In case the received buffer does not contain the data in SKB format,
 429  * the function creates a blank SKB, fills it with the data from the
 430  * received buffer and then sends this new SKB to the kernel.
 431  */
 432 int mwifiex_recv_packet(struct mwifiex_private *priv, struct sk_buff *skb)
 433 {
 434         struct mwifiex_sta_node *src_node;
 435         struct ethhdr *p_ethhdr;
 436
 437         if (!skb)
 438                 return -1;
 439
 440         priv->stats.rx_bytes += skb->len;
 441         priv->stats.rx_packets++;
 442
 443         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
 444                 p_ethhdr = (void *)skb->data;
 445                 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
 446                 if (src_node) {
 447                         src_node->stats.last_rx = jiffies;
 448                         src_node->stats.rx_bytes += skb->len;
 449                         src_node->stats.rx_packets++;
 450                 }
 451         }
 452
 453         skb->dev = priv->netdev;
 454         skb->protocol = eth_type_trans(skb, priv->netdev);
 455         skb->ip_summed = CHECKSUM_NONE;
 456
 457         /* This is required only in case of 11n and USB/PCIE as we alloc
 458          * a buffer of 4K only if its 11N (to be able to receive 4K
 459          * AMSDU packets). In case of SD we allocate buffers based
 460          * on the size of packet and hence this is not needed.
 461          *
 462          * Modifying the truesize here as our allocation for each
 463          * skb is 4K but we only receive 2K packets and this cause
 464          * the kernel to start dropping packets in case where
 465          * application has allocated buffer based on 2K size i.e.
 466          * if there a 64K packet received (in IP fragments and
 467          * application allocates 64K to receive this packet but
 468          * this packet would almost double up because we allocate
 469          * each 1.5K fragment in 4K and pass it up. As soon as the
 470          * 64K limit hits kernel will start to drop rest of the
 471          * fragments. Currently we fail the Filesndl-ht.scr script
 472          * for UDP, hence this fix
 473          */
 474         if ((priv->adapter->iface_type == MWIFIEX_USB ||
 475              priv->adapter->iface_type == MWIFIEX_PCIE) &&
 476             (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
 477                 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
 478
 479         if (in_interrupt())
 480                 netif_rx(skb);
 481         else
 482                 netif_rx_ni(skb);
 483
 484         return 0;
 485 }
 486
 487 /*
 488  * IOCTL completion callback handler.
 489  *
 490  * This function is called when a pending IOCTL is completed.
 491  *
 492  * If work queue support is enabled, the function wakes up the
 493  * corresponding waiting function. Otherwise, it processes the
 494  * IOCTL response and frees the response buffer.
 495  */
 496 int mwifiex_complete_cmd(struct mwifiex_adapter *adapter,
 497                          struct cmd_ctrl_node *cmd_node)
 498 {
 499         mwifiex_dbg(adapter, CMD,
 500                     "cmd completed: status=%d\n",
 501                     adapter->cmd_wait_q.status);
 502
 503         *(cmd_node->condition) = true;
 504
 505         if (adapter->cmd_wait_q.status == -ETIMEDOUT)
 506                 mwifiex_dbg(adapter, ERROR, "cmd timeout\n");
 507         else
 508                 wake_up_interruptible(&adapter->cmd_wait_q.wait);
 509
 510         return 0;
 511 }
 512
 513 /* This function will return the pointer to station entry in station list
 514  * table which matches specified mac address.
 515  * This function should be called after acquiring RA list spinlock.
 516  * NULL is returned if station entry is not found in associated STA list.
 517  */
 518 struct mwifiex_sta_node *
 519 mwifiex_get_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 520 {
 521         struct mwifiex_sta_node *node;
 522
 523         if (!mac)
 524                 return NULL;
 525
 526         list_for_each_entry(node, &priv->sta_list, list) {
 527                 if (!memcmp(node->mac_addr, mac, ETH_ALEN))
 528                         return node;
 529         }
 530
 531         return NULL;
 532 }
 533
 534 /* This function will add a sta_node entry to associated station list
 535  * table with the given mac address.
 536  * If entry exist already, existing entry is returned.
 537  * If received mac address is NULL, NULL is returned.
 538  */
 539 struct mwifiex_sta_node *
 540 mwifiex_add_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 541 {
 542         struct mwifiex_sta_node *node;
 543         unsigned long flags;
 544
 545         if (!mac)
 546                 return NULL;
 547
 548         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 549         node = mwifiex_get_sta_entry(priv, mac);
 550         if (node)
 551                 goto done;
 552
 553         node = kzalloc(sizeof(*node), GFP_ATOMIC);
 554         if (!node)
 555                 goto done;
 556
 557         memcpy(node->mac_addr, mac, ETH_ALEN);
 558         list_add_tail(&node->list, &priv->sta_list);
 559
 560 done:
 561         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 562         return node;
 563 }
 564
 565 /* This function will search for HT IE in association request IEs
 566  * and set station HT parameters accordingly.
 567  */
 568 void
 569 mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
 570                        int ies_len, struct mwifiex_sta_node *node)
 571 {
 572         struct ieee_types_header *ht_cap_ie;
 573         const struct ieee80211_ht_cap *ht_cap;
 574
 575         if (!ies)
 576                 return;
 577
 578         ht_cap_ie = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies,
 579                                              ies_len);
 580         if (ht_cap_ie) {
 581                 ht_cap = (void *)(ht_cap_ie + 1);
 582                 node->is_11n_enabled = 1;
 583                 node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
 584                                   IEEE80211_HT_CAP_MAX_AMSDU ?
 585                                   MWIFIEX_TX_DATA_BUF_SIZE_8K :
 586                                   MWIFIEX_TX_DATA_BUF_SIZE_4K;
 587         } else {
 588                 node->is_11n_enabled = 0;
 589         }
 590
 591         return;
 592 }
 593
 594 /* This function will delete a station entry from station list */
 595 void mwifiex_del_sta_entry(struct mwifiex_private *priv, const u8 *mac)
 596 {
 597         struct mwifiex_sta_node *node;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 601
 602         node = mwifiex_get_sta_entry(priv, mac);
 603         if (node) {
 604                 list_del(&node->list);
 605                 kfree(node);
 606         }
 607
 608         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 609         return;
 610 }
 611
 612 /* This function will delete all stations from associated station list. */
 613 void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
 614 {
 615         struct mwifiex_sta_node *node, *tmp;
 616         unsigned long flags;
 617
 618         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 619
 620         list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
 621                 list_del(&node->list);
 622                 kfree(node);
 623         }
 624
 625         INIT_LIST_HEAD(&priv->sta_list);
 626         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 627         return;
 628 }
 629
 630 /* This function adds histogram data to histogram array*/
 631 void mwifiex_hist_data_add(struct mwifiex_private *priv,
 632                            u8 rx_rate, s8 snr, s8 nflr)
 633 {
 634         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 635
 636         if (atomic_read(&phist_data->num_samples) > MWIFIEX_HIST_MAX_SAMPLES)
 637                 mwifiex_hist_data_reset(priv);
 638         mwifiex_hist_data_set(priv, rx_rate, snr, nflr);
 639 }
 640
 641 /* function to add histogram record */
 642 void mwifiex_hist_data_set(struct mwifiex_private *priv, u8 rx_rate, s8 snr,
 643                            s8 nflr)
 644 {
 645         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 646
 647         atomic_inc(&phist_data->num_samples);
 648         atomic_inc(&phist_data->rx_rate[rx_rate]);
 649         atomic_inc(&phist_data->snr[snr]);
 650         atomic_inc(&phist_data->noise_flr[128 + nflr]);
 651         atomic_inc(&phist_data->sig_str[nflr - snr]);
 652 }
 653
 654 /* function to reset histogram data during init/reset */
 655 void mwifiex_hist_data_reset(struct mwifiex_private *priv)
 656 {
 657         int ix;
 658         struct mwifiex_histogram_data *phist_data = priv->hist_data;
 659
 660         atomic_set(&phist_data->num_samples, 0);
 661         for (ix = 0; ix < MWIFIEX_MAX_AC_RX_RATES; ix++)
 662                 atomic_set(&phist_data->rx_rate[ix], 0);
 663         for (ix = 0; ix < MWIFIEX_MAX_SNR; ix++)
 664                 atomic_set(&phist_data->snr[ix], 0);
 665         for (ix = 0; ix < MWIFIEX_MAX_NOISE_FLR; ix++)
 666                 atomic_set(&phist_data->noise_flr[ix], 0);
 667         for (ix = 0; ix < MWIFIEX_MAX_SIG_STRENGTH; ix++)
 668                 atomic_set(&phist_data->sig_str[ix], 0);
 669 }
 670
 671 void *mwifiex_alloc_dma_align_buf(int rx_len, gfp_t flags)
 672 {
 673         struct sk_buff *skb;
 674         int buf_len, pad;
 675
 676         buf_len = rx_len + MWIFIEX_RX_HEADROOM + MWIFIEX_DMA_ALIGN_SZ;
 677
 678         skb = __dev_alloc_skb(buf_len, flags);
 679
 680         if (!skb)
 681                 return NULL;
 682
 683         skb_reserve(skb, MWIFIEX_RX_HEADROOM);
 684
 685         pad = MWIFIEX_ALIGN_ADDR(skb->data, MWIFIEX_DMA_ALIGN_SZ) -
 686               (long)skb->data;
 687
 688         skb_reserve(skb, pad);
 689
 690         return skb;
 691 }
 692 EXPORT_SYMBOL_GPL(mwifiex_alloc_dma_align_buf);