Merge remote-tracking branch 'keys/keys-next'

[deliverable/linux.git] / drivers / net / wireless / marvell / mwifiex / util.c

/*
 * Marvell Wireless LAN device driver: utility functions
 *
 * Copyright (C) 2011-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"

static struct mwifiex_debug_data items[] = {
        {"debug_mask", item_size(debug_mask),
         item_addr(debug_mask), 1},
        {"int_counter", item_size(int_counter),
         item_addr(int_counter), 1},
        {"wmm_ac_vo", item_size(packets_out[WMM_AC_VO]),
         item_addr(packets_out[WMM_AC_VO]), 1},
        {"wmm_ac_vi", item_size(packets_out[WMM_AC_VI]),
         item_addr(packets_out[WMM_AC_VI]), 1},
        {"wmm_ac_be", item_size(packets_out[WMM_AC_BE]),
         item_addr(packets_out[WMM_AC_BE]), 1},
        {"wmm_ac_bk", item_size(packets_out[WMM_AC_BK]),
         item_addr(packets_out[WMM_AC_BK]), 1},
        {"tx_buf_size", item_size(tx_buf_size),
         item_addr(tx_buf_size), 1},
        {"curr_tx_buf_size", item_size(curr_tx_buf_size),
         item_addr(curr_tx_buf_size), 1},
        {"ps_mode", item_size(ps_mode),
         item_addr(ps_mode), 1},
        {"ps_state", item_size(ps_state),
         item_addr(ps_state), 1},
        {"is_deep_sleep", item_size(is_deep_sleep),
         item_addr(is_deep_sleep), 1},
        {"wakeup_dev_req", item_size(pm_wakeup_card_req),
         item_addr(pm_wakeup_card_req), 1},
        {"wakeup_tries", item_size(pm_wakeup_fw_try),
         item_addr(pm_wakeup_fw_try), 1},
        {"hs_configured", item_size(is_hs_configured),
         item_addr(is_hs_configured), 1},
        {"hs_activated", item_size(hs_activated),
         item_addr(hs_activated), 1},
        {"num_tx_timeout", item_size(num_tx_timeout),
         item_addr(num_tx_timeout), 1},
        {"is_cmd_timedout", item_size(is_cmd_timedout),
         item_addr(is_cmd_timedout), 1},
        {"timeout_cmd_id", item_size(timeout_cmd_id),
         item_addr(timeout_cmd_id), 1},
        {"timeout_cmd_act", item_size(timeout_cmd_act),
         item_addr(timeout_cmd_act), 1},
        {"last_cmd_id", item_size(last_cmd_id),
         item_addr(last_cmd_id), DBG_CMD_NUM},
        {"last_cmd_act", item_size(last_cmd_act),
         item_addr(last_cmd_act), DBG_CMD_NUM},
        {"last_cmd_index", item_size(last_cmd_index),
         item_addr(last_cmd_index), 1},
        {"last_cmd_resp_id", item_size(last_cmd_resp_id),
         item_addr(last_cmd_resp_id), DBG_CMD_NUM},
        {"last_cmd_resp_index", item_size(last_cmd_resp_index),
         item_addr(last_cmd_resp_index), 1},
        {"last_event", item_size(last_event),
         item_addr(last_event), DBG_CMD_NUM},
        {"last_event_index", item_size(last_event_index),
         item_addr(last_event_index), 1},
        {"last_mp_wr_bitmap", item_size(last_mp_wr_bitmap),
         item_addr(last_mp_wr_bitmap), MWIFIEX_DBG_SDIO_MP_NUM},
        {"last_mp_wr_ports", item_size(last_mp_wr_ports),
         item_addr(last_mp_wr_ports), MWIFIEX_DBG_SDIO_MP_NUM},
        {"last_mp_wr_len", item_size(last_mp_wr_len),
         item_addr(last_mp_wr_len), MWIFIEX_DBG_SDIO_MP_NUM},
        {"last_mp_curr_wr_port", item_size(last_mp_curr_wr_port),
         item_addr(last_mp_curr_wr_port), MWIFIEX_DBG_SDIO_MP_NUM},
        {"last_sdio_mp_index", item_size(last_sdio_mp_index),
         item_addr(last_sdio_mp_index), 1},
        {"num_cmd_h2c_fail", item_size(num_cmd_host_to_card_failure),
         item_addr(num_cmd_host_to_card_failure), 1},
        {"num_cmd_sleep_cfm_fail",
         item_size(num_cmd_sleep_cfm_host_to_card_failure),
         item_addr(num_cmd_sleep_cfm_host_to_card_failure), 1},
        {"num_tx_h2c_fail", item_size(num_tx_host_to_card_failure),
         item_addr(num_tx_host_to_card_failure), 1},
        {"num_evt_deauth", item_size(num_event_deauth),
         item_addr(num_event_deauth), 1},
        {"num_evt_disassoc", item_size(num_event_disassoc),
         item_addr(num_event_disassoc), 1},
        {"num_evt_link_lost", item_size(num_event_link_lost),
         item_addr(num_event_link_lost), 1},
        {"num_cmd_deauth", item_size(num_cmd_deauth),
         item_addr(num_cmd_deauth), 1},
        {"num_cmd_assoc_ok", item_size(num_cmd_assoc_success),
         item_addr(num_cmd_assoc_success), 1},
        {"num_cmd_assoc_fail", item_size(num_cmd_assoc_failure),
         item_addr(num_cmd_assoc_failure), 1},
        {"cmd_sent", item_size(cmd_sent),
         item_addr(cmd_sent), 1},
        {"data_sent", item_size(data_sent),
         item_addr(data_sent), 1},
        {"cmd_resp_received", item_size(cmd_resp_received),
         item_addr(cmd_resp_received), 1},
        {"event_received", item_size(event_received),
         item_addr(event_received), 1},

        /* variables defined in struct mwifiex_adapter */
        {"cmd_pending", adapter_item_size(cmd_pending),
         adapter_item_addr(cmd_pending), 1},
        {"tx_pending", adapter_item_size(tx_pending),
         adapter_item_addr(tx_pending), 1},
        {"rx_pending", adapter_item_size(rx_pending),
         adapter_item_addr(rx_pending), 1},
};

static int num_of_items = ARRAY_SIZE(items);

/*
 * Firmware initialization complete callback handler.
 *
 * This function wakes up the function waiting on the init
 * wait queue for the firmware initialization to complete.
 */
int mwifiex_init_fw_complete(struct mwifiex_adapter *adapter)
{

        if (adapter->hw_status == MWIFIEX_HW_STATUS_READY)
                if (adapter->if_ops.init_fw_port)
                        adapter->if_ops.init_fw_port(adapter);

        adapter->init_wait_q_woken = true;
        wake_up_interruptible(&adapter->init_wait_q);
        return 0;
}

/*
 * Firmware shutdown complete callback handler.
 *
 * This function sets the hardware status to not ready and wakes up
 * the function waiting on the init wait queue for the firmware
 * shutdown to complete.
 */
int mwifiex_shutdown_fw_complete(struct mwifiex_adapter *adapter)
{
        adapter->hw_status = MWIFIEX_HW_STATUS_NOT_READY;
        adapter->init_wait_q_woken = true;
        wake_up_interruptible(&adapter->init_wait_q);
        return 0;
}

/*
 * This function sends init/shutdown command
 * to firmware.
 */
int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
                             u32 func_init_shutdown)
{
        u16 cmd;

        if (func_init_shutdown == MWIFIEX_FUNC_INIT) {
                cmd = HostCmd_CMD_FUNC_INIT;
        } else if (func_init_shutdown == MWIFIEX_FUNC_SHUTDOWN) {
                cmd = HostCmd_CMD_FUNC_SHUTDOWN;
        } else {
                mwifiex_dbg(priv->adapter, ERROR,
                            "unsupported parameter\n");
                return -1;
        }

        return mwifiex_send_cmd(priv, cmd, HostCmd_ACT_GEN_SET, 0, NULL, true);
}
EXPORT_SYMBOL_GPL(mwifiex_init_shutdown_fw);

/*
 * IOCTL request handler to set/get debug information.
 *
 * This function collates/sets the information from/to different driver
 * structures.
 */
int mwifiex_get_debug_info(struct mwifiex_private *priv,
                           struct mwifiex_debug_info *info)
{
        struct mwifiex_adapter *adapter = priv->adapter;

        if (info) {
                info->debug_mask = adapter->debug_mask;
                memcpy(info->packets_out,
                       priv->wmm.packets_out,
                       sizeof(priv->wmm.packets_out));
                info->curr_tx_buf_size = (u32) adapter->curr_tx_buf_size;
                info->tx_buf_size = (u32) adapter->tx_buf_size;
                info->rx_tbl_num = mwifiex_get_rx_reorder_tbl(priv,
                                                              info->rx_tbl);
                info->tx_tbl_num = mwifiex_get_tx_ba_stream_tbl(priv,
                                                                info->tx_tbl);
                info->tdls_peer_num = mwifiex_get_tdls_list(priv,
                                                            info->tdls_list);
                info->ps_mode = adapter->ps_mode;
                info->ps_state = adapter->ps_state;
                info->is_deep_sleep = adapter->is_deep_sleep;
                info->pm_wakeup_card_req = adapter->pm_wakeup_card_req;
                info->pm_wakeup_fw_try = adapter->pm_wakeup_fw_try;
                info->is_hs_configured = adapter->is_hs_configured;
                info->hs_activated = adapter->hs_activated;
                info->is_cmd_timedout = adapter->is_cmd_timedout;
                info->num_cmd_host_to_card_failure
                                = adapter->dbg.num_cmd_host_to_card_failure;
                info->num_cmd_sleep_cfm_host_to_card_failure
                        = adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure;
                info->num_tx_host_to_card_failure
                                = adapter->dbg.num_tx_host_to_card_failure;
                info->num_event_deauth = adapter->dbg.num_event_deauth;
                info->num_event_disassoc = adapter->dbg.num_event_disassoc;
                info->num_event_link_lost = adapter->dbg.num_event_link_lost;
                info->num_cmd_deauth = adapter->dbg.num_cmd_deauth;
                info->num_cmd_assoc_success =
                                        adapter->dbg.num_cmd_assoc_success;
                info->num_cmd_assoc_failure =
                                        adapter->dbg.num_cmd_assoc_failure;
                info->num_tx_timeout = adapter->dbg.num_tx_timeout;
                info->timeout_cmd_id = adapter->dbg.timeout_cmd_id;
                info->timeout_cmd_act = adapter->dbg.timeout_cmd_act;
                memcpy(info->last_cmd_id, adapter->dbg.last_cmd_id,
                       sizeof(adapter->dbg.last_cmd_id));
                memcpy(info->last_cmd_act, adapter->dbg.last_cmd_act,
                       sizeof(adapter->dbg.last_cmd_act));
                info->last_cmd_index = adapter->dbg.last_cmd_index;
                memcpy(info->last_cmd_resp_id, adapter->dbg.last_cmd_resp_id,
                       sizeof(adapter->dbg.last_cmd_resp_id));
                info->last_cmd_resp_index = adapter->dbg.last_cmd_resp_index;
                memcpy(info->last_event, adapter->dbg.last_event,
                       sizeof(adapter->dbg.last_event));
                info->last_event_index = adapter->dbg.last_event_index;
                memcpy(info->last_mp_wr_bitmap, adapter->dbg.last_mp_wr_bitmap,
                       sizeof(adapter->dbg.last_mp_wr_bitmap));
                memcpy(info->last_mp_wr_ports, adapter->dbg.last_mp_wr_ports,
                       sizeof(adapter->dbg.last_mp_wr_ports));
                memcpy(info->last_mp_curr_wr_port,
                       adapter->dbg.last_mp_curr_wr_port,
                       sizeof(adapter->dbg.last_mp_curr_wr_port));
                memcpy(info->last_mp_wr_len, adapter->dbg.last_mp_wr_len,
                       sizeof(adapter->dbg.last_mp_wr_len));
                info->last_sdio_mp_index = adapter->dbg.last_sdio_mp_index;
                info->data_sent = adapter->data_sent;
                info->cmd_sent = adapter->cmd_sent;
                info->cmd_resp_received = adapter->cmd_resp_received;
        }

        return 0;
}

int mwifiex_debug_info_to_buffer(struct mwifiex_private *priv, char *buf,
                                 struct mwifiex_debug_info *info)
{
        char *p = buf;
        struct mwifiex_debug_data *d = &items[0];
        size_t size, addr;
        long val;
        int i, j;

        if (!info)
                return 0;

        for (i = 0; i < num_of_items; i++) {
                p += sprintf(p, "%s=", d[i].name);

                size = d[i].size / d[i].num;

                if (i < (num_of_items - 3))
                        addr = d[i].addr + (size_t)info;
                else /* The last 3 items are struct mwifiex_adapter variables */
                        addr = d[i].addr + (size_t)priv->adapter;

                for (j = 0; j < d[i].num; j++) {
                        switch (size) {
                        case 1:
                                val = *((u8 *)addr);
                                break;
                        case 2:
                                val = *((u16 *)addr);
                                break;
                        case 4:
                                val = *((u32 *)addr);
                                break;
                        case 8:
                                val = *((long long *)addr);
                                break;
                        default:
                                val = -1;
                                break;
                        }

                        p += sprintf(p, "%#lx ", val);
                        addr += size;
                }

                p += sprintf(p, "\n");
        }

        if (info->tx_tbl_num) {
                p += sprintf(p, "Tx BA stream table:\n");
                for (i = 0; i < info->tx_tbl_num; i++)
                        p += sprintf(p, "tid = %d, ra = %pM\n",
                                     info->tx_tbl[i].tid, info->tx_tbl[i].ra);
        }

        if (info->rx_tbl_num) {
                p += sprintf(p, "Rx reorder table:\n");
                for (i = 0; i < info->rx_tbl_num; i++) {
                        p += sprintf(p, "tid = %d, ta = %pM, ",
                                     info->rx_tbl[i].tid,
                                     info->rx_tbl[i].ta);
                        p += sprintf(p, "start_win = %d, ",
                                     info->rx_tbl[i].start_win);
                        p += sprintf(p, "win_size = %d, buffer: ",
                                     info->rx_tbl[i].win_size);

                        for (j = 0; j < info->rx_tbl[i].win_size; j++)
                                p += sprintf(p, "%c ",
                                             info->rx_tbl[i].buffer[j] ?
                                             '1' : '0');

                        p += sprintf(p, "\n");
                }
        }

        if (info->tdls_peer_num) {
                p += sprintf(p, "TDLS peer table:\n");
                for (i = 0; i < info->tdls_peer_num; i++) {
                        p += sprintf(p, "peer = %pM",
                                     info->tdls_list[i].peer_addr);
                        p += sprintf(p, "\n");
                }
        }

        return p - buf;
}

static int
mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
                          struct rxpd *rx_pd)
{
        u16 stype;
        u8 category, action_code, *addr2;
        struct ieee80211_hdr *ieee_hdr = (void *)payload;

        stype = (le16_to_cpu(ieee_hdr->frame_control) & IEEE80211_FCTL_STYPE);

        switch (stype) {
        case IEEE80211_STYPE_ACTION:
                category = *(payload + sizeof(struct ieee80211_hdr));
                switch (category) {
                case WLAN_CATEGORY_PUBLIC:
                        action_code = *(payload + sizeof(struct ieee80211_hdr)
                                        + 1);
                        if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
                                addr2 = ieee_hdr->addr2;
                                mwifiex_dbg(priv->adapter, INFO,
                                            "TDLS discovery response %pM nf=%d, snr=%d\n",
                                            addr2, rx_pd->nf, rx_pd->snr);
                                mwifiex_auto_tdls_update_peer_signal(priv,
                                                                     addr2,
                                                                     rx_pd->snr,
                                                                     rx_pd->nf);
                        }
                        break;
                case WLAN_CATEGORY_BACK:
                        /*we dont indicate BACK action frames to cfg80211*/
                        mwifiex_dbg(priv->adapter, INFO,
                                    "drop BACK action frames");
                        return -1;
                default:
                        mwifiex_dbg(priv->adapter, INFO,
                                    "unknown public action frame category %d\n",
                                    category);
                }
                break;
        default:
                mwifiex_dbg(priv->adapter, INFO,
                    "unknown mgmt frame subtype %#x\n", stype);
                return 0;
        }

        return 0;
}
/*
 * This function processes the received management packet and send it
 * to the kernel.
 */
int
mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
                            struct sk_buff *skb)
{
        struct rxpd *rx_pd;
        u16 pkt_len;
        struct ieee80211_hdr *ieee_hdr;

        if (!skb)
                return -1;

        if (!priv->mgmt_frame_mask ||
            priv->wdev.iftype == NL80211_IFTYPE_UNSPECIFIED) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "do not receive mgmt frames on uninitialized intf");
                return -1;
        }

        rx_pd = (struct rxpd *)skb->data;

        skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
        skb_pull(skb, sizeof(pkt_len));

        pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);

        ieee_hdr = (void *)skb->data;
        if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
                if (mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
                                              pkt_len, rx_pd))
                        return -1;
        }
        /* Remove address4 */
        memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),
                skb->data + sizeof(struct ieee80211_hdr),
                pkt_len - sizeof(struct ieee80211_hdr));

        pkt_len -= ETH_ALEN + sizeof(pkt_len);
        rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);

        cfg80211_rx_mgmt(&priv->wdev, priv->roc_cfg.chan.center_freq,
                         CAL_RSSI(rx_pd->snr, rx_pd->nf), skb->data, pkt_len,
                         0);

        return 0;
}

/*
 * This function processes the received packet before sending it to the
 * kernel.
 *
 * It extracts the SKB from the received buffer and sends it to kernel.
 * In case the received buffer does not contain the data in SKB format,
 * the function creates a blank SKB, fills it with the data from the
 * received buffer and then sends this new SKB to the kernel.
 */
int mwifiex_recv_packet(struct mwifiex_private *priv, struct sk_buff *skb)
{
        struct mwifiex_sta_node *src_node;
        struct ethhdr *p_ethhdr;

        if (!skb)
                return -1;

        priv->stats.rx_bytes += skb->len;
        priv->stats.rx_packets++;

        if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
                p_ethhdr = (void *)skb->data;
                src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
                if (src_node) {
                        src_node->stats.last_rx = jiffies;
                        src_node->stats.rx_bytes += skb->len;
                        src_node->stats.rx_packets++;
                }
        }

        skb->dev = priv->netdev;
        skb->protocol = eth_type_trans(skb, priv->netdev);
        skb->ip_summed = CHECKSUM_NONE;

        /* This is required only in case of 11n and USB/PCIE as we alloc
         * a buffer of 4K only if its 11N (to be able to receive 4K
         * AMSDU packets). In case of SD we allocate buffers based
         * on the size of packet and hence this is not needed.
         *
         * Modifying the truesize here as our allocation for each
         * skb is 4K but we only receive 2K packets and this cause
         * the kernel to start dropping packets in case where
         * application has allocated buffer based on 2K size i.e.
         * if there a 64K packet received (in IP fragments and
         * application allocates 64K to receive this packet but
         * this packet would almost double up because we allocate
         * each 1.5K fragment in 4K and pass it up. As soon as the
         * 64K limit hits kernel will start to drop rest of the
         * fragments. Currently we fail the Filesndl-ht.scr script
         * for UDP, hence this fix
         */
        if ((priv->adapter->iface_type == MWIFIEX_USB ||
             priv->adapter->iface_type == MWIFIEX_PCIE) &&
            (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
                skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);

        if (in_interrupt())
                netif_rx(skb);
        else
                netif_rx_ni(skb);

        return 0;
}

/*
 * IOCTL completion callback handler.
 *
 * This function is called when a pending IOCTL is completed.
 *
 * If work queue support is enabled, the function wakes up the
 * corresponding waiting function. Otherwise, it processes the
 * IOCTL response and frees the response buffer.
 */
int mwifiex_complete_cmd(struct mwifiex_adapter *adapter,
                         struct cmd_ctrl_node *cmd_node)
{
        WARN_ON(!cmd_node->wait_q_enabled);
        mwifiex_dbg(adapter, CMD, "cmd completed: status=%d\n",
                    adapter->cmd_wait_q.status);

        *cmd_node->condition = true;
        wake_up_interruptible(&adapter->cmd_wait_q.wait);

        return 0;
}

/* This function will return the pointer to station entry in station list
 * table which matches specified mac address.
 * This function should be called after acquiring RA list spinlock.
 * NULL is returned if station entry is not found in associated STA list.
 */
struct mwifiex_sta_node *
mwifiex_get_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
        struct mwifiex_sta_node *node;

        if (!mac)
                return NULL;

        list_for_each_entry(node, &priv->sta_list, list) {
                if (!memcmp(node->mac_addr, mac, ETH_ALEN))
                        return node;
        }

        return NULL;
}

static struct mwifiex_sta_node *
mwifiex_get_tdls_sta_entry(struct mwifiex_private *priv, u8 status)
{
        struct mwifiex_sta_node *node;

        list_for_each_entry(node, &priv->sta_list, list) {
                if (node->tdls_status == status)
                        return node;
        }

        return NULL;
}

/* If tdls channel switching is on-going, tx data traffic should be
 * blocked until the switching stage completed.
 */
u8 mwifiex_is_tdls_chan_switching(struct mwifiex_private *priv)
{
        struct mwifiex_sta_node *sta_ptr;

        if (!priv || !ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info))
                return false;

        sta_ptr = mwifiex_get_tdls_sta_entry(priv, TDLS_CHAN_SWITCHING);
        if (sta_ptr)
                return true;

        return false;
}

u8 mwifiex_is_tdls_off_chan(struct mwifiex_private *priv)
{
        struct mwifiex_sta_node *sta_ptr;

        if (!priv || !ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info))
                return false;

        sta_ptr = mwifiex_get_tdls_sta_entry(priv, TDLS_IN_OFF_CHAN);
        if (sta_ptr)
                return true;

        return false;
}

/* If tdls channel switching is on-going or tdls operate on off-channel,
 * cmd path should be blocked until tdls switched to base-channel.
 */
u8 mwifiex_is_send_cmd_allowed(struct mwifiex_private *priv)
{
        if (!priv || !ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info))
                return true;

        if (mwifiex_is_tdls_chan_switching(priv) ||
            mwifiex_is_tdls_off_chan(priv))
                return false;

        return true;
}

/* This function will add a sta_node entry to associated station list
 * table with the given mac address.
 * If entry exist already, existing entry is returned.
 * If received mac address is NULL, NULL is returned.
 */
struct mwifiex_sta_node *
mwifiex_add_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
        struct mwifiex_sta_node *node;
        unsigned long flags;

        if (!mac)
                return NULL;

        spin_lock_irqsave(&priv->sta_list_spinlock, flags);
        node = mwifiex_get_sta_entry(priv, mac);
        if (node)
                goto done;

        node = kzalloc(sizeof(*node), GFP_ATOMIC);
        if (!node)
                goto done;

        memcpy(node->mac_addr, mac, ETH_ALEN);
        list_add_tail(&node->list, &priv->sta_list);

done:
        spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
        return node;
}

/* This function will search for HT IE in association request IEs
 * and set station HT parameters accordingly.
 */
void
mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
                       int ies_len, struct mwifiex_sta_node *node)
{
        struct ieee_types_header *ht_cap_ie;
        const struct ieee80211_ht_cap *ht_cap;

        if (!ies)
                return;

        ht_cap_ie = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies,
                                             ies_len);
        if (ht_cap_ie) {
                ht_cap = (void *)(ht_cap_ie + 1);
                node->is_11n_enabled = 1;
                node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
                                  IEEE80211_HT_CAP_MAX_AMSDU ?
                                  MWIFIEX_TX_DATA_BUF_SIZE_8K :
                                  MWIFIEX_TX_DATA_BUF_SIZE_4K;
        } else {
                node->is_11n_enabled = 0;
        }

        return;
}

/* This function will delete a station entry from station list */
void mwifiex_del_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
        struct mwifiex_sta_node *node;
        unsigned long flags;

        spin_lock_irqsave(&priv->sta_list_spinlock, flags);

        node = mwifiex_get_sta_entry(priv, mac);
        if (node) {
                list_del(&node->list);
                kfree(node);
        }

        spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
        return;
}

/* This function will delete all stations from associated station list. */
void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
{
        struct mwifiex_sta_node *node, *tmp;
        unsigned long flags;

        spin_lock_irqsave(&priv->sta_list_spinlock, flags);

        list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
                list_del(&node->list);
                kfree(node);
        }

        INIT_LIST_HEAD(&priv->sta_list);
        spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
        return;
}

/* This function adds histogram data to histogram array*/
void mwifiex_hist_data_add(struct mwifiex_private *priv,
                           u8 rx_rate, s8 snr, s8 nflr)
{
        struct mwifiex_histogram_data *phist_data = priv->hist_data;

        if (atomic_read(&phist_data->num_samples) > MWIFIEX_HIST_MAX_SAMPLES)
                mwifiex_hist_data_reset(priv);
        mwifiex_hist_data_set(priv, rx_rate, snr, nflr);
}

/* function to add histogram record */
void mwifiex_hist_data_set(struct mwifiex_private *priv, u8 rx_rate, s8 snr,
                           s8 nflr)
{
        struct mwifiex_histogram_data *phist_data = priv->hist_data;

        atomic_inc(&phist_data->num_samples);
        atomic_inc(&phist_data->rx_rate[rx_rate]);
        atomic_inc(&phist_data->snr[snr]);
        atomic_inc(&phist_data->noise_flr[128 + nflr]);
        atomic_inc(&phist_data->sig_str[nflr - snr]);
}

/* function to reset histogram data during init/reset */
void mwifiex_hist_data_reset(struct mwifiex_private *priv)
{
        int ix;
        struct mwifiex_histogram_data *phist_data = priv->hist_data;

        atomic_set(&phist_data->num_samples, 0);
        for (ix = 0; ix < MWIFIEX_MAX_AC_RX_RATES; ix++)
                atomic_set(&phist_data->rx_rate[ix], 0);
        for (ix = 0; ix < MWIFIEX_MAX_SNR; ix++)
                atomic_set(&phist_data->snr[ix], 0);
        for (ix = 0; ix < MWIFIEX_MAX_NOISE_FLR; ix++)
                atomic_set(&phist_data->noise_flr[ix], 0);
        for (ix = 0; ix < MWIFIEX_MAX_SIG_STRENGTH; ix++)
                atomic_set(&phist_data->sig_str[ix], 0);
}

void *mwifiex_alloc_dma_align_buf(int rx_len, gfp_t flags)
{
        struct sk_buff *skb;
        int buf_len, pad;

        buf_len = rx_len + MWIFIEX_RX_HEADROOM + MWIFIEX_DMA_ALIGN_SZ;

        skb = __dev_alloc_skb(buf_len, flags);

        if (!skb)
                return NULL;

        skb_reserve(skb, MWIFIEX_RX_HEADROOM);

        pad = MWIFIEX_ALIGN_ADDR(skb->data, MWIFIEX_DMA_ALIGN_SZ) -
              (long)skb->data;

        skb_reserve(skb, pad);

        return skb;
}
EXPORT_SYMBOL_GPL(mwifiex_alloc_dma_align_buf);