Merge tag 'mac80211-next-for-davem-2015-03-30' of git://git.kernel.org/pub/scm/linux...

[deliverable/linux.git] / drivers / net / wireless / brcm80211 / brcmfmac / p2p.c

/*
 * Copyright (c) 2012 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/cfg80211.h>

#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <defs.h>
#include "core.h"
#include "debug.h"
#include "fwil.h"
#include "fwil_types.h"
#include "p2p.h"
#include "cfg80211.h"

/* parameters used for p2p escan */
#define P2PAPI_SCAN_NPROBES 1
#define P2PAPI_SCAN_DWELL_TIME_MS 80
#define P2PAPI_SCAN_SOCIAL_DWELL_TIME_MS 40
#define P2PAPI_SCAN_HOME_TIME_MS 60
#define P2PAPI_SCAN_NPROBS_TIME_MS 30
#define P2PAPI_SCAN_AF_SEARCH_DWELL_TIME_MS 100
#define WL_SCAN_CONNECT_DWELL_TIME_MS 200
#define WL_SCAN_JOIN_PROBE_INTERVAL_MS 20

#define BRCMF_P2P_WILDCARD_SSID         "DIRECT-"
#define BRCMF_P2P_WILDCARD_SSID_LEN     (sizeof(BRCMF_P2P_WILDCARD_SSID) - 1)

#define SOCIAL_CHAN_1           1
#define SOCIAL_CHAN_2           6
#define SOCIAL_CHAN_3           11
#define IS_P2P_SOCIAL_CHANNEL(channel) ((channel == SOCIAL_CHAN_1) || \
                                         (channel == SOCIAL_CHAN_2) || \
                                         (channel == SOCIAL_CHAN_3))
#define BRCMF_P2P_TEMP_CHAN     SOCIAL_CHAN_3
#define SOCIAL_CHAN_CNT         3
#define AF_PEER_SEARCH_CNT      2

#define BRCMF_SCB_TIMEOUT_VALUE 20

#define P2P_VER                 9       /* P2P version: 9=WiFi P2P v1.0 */
#define P2P_PUB_AF_CATEGORY     0x04
#define P2P_PUB_AF_ACTION       0x09
#define P2P_AF_CATEGORY         0x7f
#define P2P_OUI                 "\x50\x6F\x9A"  /* P2P OUI */
#define P2P_OUI_LEN             3               /* P2P OUI length */

/* Action Frame Constants */
#define DOT11_ACTION_HDR_LEN    2       /* action frame category + action */
#define DOT11_ACTION_CAT_OFF    0       /* category offset */
#define DOT11_ACTION_ACT_OFF    1       /* action offset */

#define P2P_AF_DWELL_TIME               200
#define P2P_AF_MIN_DWELL_TIME           100
#define P2P_AF_MED_DWELL_TIME           400
#define P2P_AF_LONG_DWELL_TIME          1000
#define P2P_AF_TX_MAX_RETRY             1
#define P2P_AF_MAX_WAIT_TIME            2000
#define P2P_INVALID_CHANNEL             -1
#define P2P_CHANNEL_SYNC_RETRY          5
#define P2P_AF_FRM_SCAN_MAX_WAIT        1500
#define P2P_DEFAULT_SLEEP_TIME_VSDB     200

/* WiFi P2P Public Action Frame OUI Subtypes */
#define P2P_PAF_GON_REQ         0       /* Group Owner Negotiation Req */
#define P2P_PAF_GON_RSP         1       /* Group Owner Negotiation Rsp */
#define P2P_PAF_GON_CONF        2       /* Group Owner Negotiation Confirm */
#define P2P_PAF_INVITE_REQ      3       /* P2P Invitation Request */
#define P2P_PAF_INVITE_RSP      4       /* P2P Invitation Response */
#define P2P_PAF_DEVDIS_REQ      5       /* Device Discoverability Request */
#define P2P_PAF_DEVDIS_RSP      6       /* Device Discoverability Response */
#define P2P_PAF_PROVDIS_REQ     7       /* Provision Discovery Request */
#define P2P_PAF_PROVDIS_RSP     8       /* Provision Discovery Response */
#define P2P_PAF_SUBTYPE_INVALID 255     /* Invalid Subtype */

/* WiFi P2P Action Frame OUI Subtypes */
#define P2P_AF_NOTICE_OF_ABSENCE        0       /* Notice of Absence */
#define P2P_AF_PRESENCE_REQ             1       /* P2P Presence Request */
#define P2P_AF_PRESENCE_RSP             2       /* P2P Presence Response */
#define P2P_AF_GO_DISC_REQ              3       /* GO Discoverability Request */

/* P2P Service Discovery related */
#define P2PSD_ACTION_CATEGORY           0x04    /* Public action frame */
#define P2PSD_ACTION_ID_GAS_IREQ        0x0a    /* GAS Initial Request AF */
#define P2PSD_ACTION_ID_GAS_IRESP       0x0b    /* GAS Initial Response AF */
#define P2PSD_ACTION_ID_GAS_CREQ        0x0c    /* GAS Comback Request AF */
#define P2PSD_ACTION_ID_GAS_CRESP       0x0d    /* GAS Comback Response AF */

/**
 * struct brcmf_p2p_disc_st_le - set discovery state in firmware.
 *
 * @state: requested discovery state (see enum brcmf_p2p_disc_state).
 * @chspec: channel parameter for %WL_P2P_DISC_ST_LISTEN state.
 * @dwell: dwell time in ms for %WL_P2P_DISC_ST_LISTEN state.
 */
struct brcmf_p2p_disc_st_le {
        u8 state;
        __le16 chspec;
        __le16 dwell;
};

/**
 * enum brcmf_p2p_disc_state - P2P discovery state values
 *
 * @WL_P2P_DISC_ST_SCAN: P2P discovery with wildcard SSID and P2P IE.
 * @WL_P2P_DISC_ST_LISTEN: P2P discovery off-channel for specified time.
 * @WL_P2P_DISC_ST_SEARCH: P2P discovery with P2P wildcard SSID and P2P IE.
 */
enum brcmf_p2p_disc_state {
        WL_P2P_DISC_ST_SCAN,
        WL_P2P_DISC_ST_LISTEN,
        WL_P2P_DISC_ST_SEARCH
};

/**
 * struct brcmf_p2p_scan_le - P2P specific scan request.
 *
 * @type: type of scan method requested (values: 'E' or 'S').
 * @reserved: reserved (ignored).
 * @eparams: parameters used for type 'E'.
 * @sparams: parameters used for type 'S'.
 */
struct brcmf_p2p_scan_le {
        u8 type;
        u8 reserved[3];
        union {
                struct brcmf_escan_params_le eparams;
                struct brcmf_scan_params_le sparams;
        };
};

/**
 * struct brcmf_p2p_pub_act_frame - WiFi P2P Public Action Frame
 *
 * @category: P2P_PUB_AF_CATEGORY
 * @action: P2P_PUB_AF_ACTION
 * @oui[3]: P2P_OUI
 * @oui_type: OUI type - P2P_VER
 * @subtype: OUI subtype - P2P_TYPE_*
 * @dialog_token: nonzero, identifies req/rsp transaction
 * @elts[1]: Variable length information elements.
 */
struct brcmf_p2p_pub_act_frame {
        u8      category;
        u8      action;
        u8      oui[3];
        u8      oui_type;
        u8      subtype;
        u8      dialog_token;
        u8      elts[1];
};

/**
 * struct brcmf_p2p_action_frame - WiFi P2P Action Frame
 *
 * @category: P2P_AF_CATEGORY
 * @OUI[3]: OUI - P2P_OUI
 * @type: OUI Type - P2P_VER
 * @subtype: OUI Subtype - P2P_AF_*
 * @dialog_token: nonzero, identifies req/resp tranaction
 * @elts[1]: Variable length information elements.
 */
struct brcmf_p2p_action_frame {
        u8      category;
        u8      oui[3];
        u8      type;
        u8      subtype;
        u8      dialog_token;
        u8      elts[1];
};

/**
 * struct brcmf_p2psd_gas_pub_act_frame - Wi-Fi GAS Public Action Frame
 *
 * @category: 0x04 Public Action Frame
 * @action: 0x6c Advertisement Protocol
 * @dialog_token: nonzero, identifies req/rsp transaction
 * @query_data[1]: Query Data. SD gas ireq SD gas iresp
 */
struct brcmf_p2psd_gas_pub_act_frame {
        u8      category;
        u8      action;
        u8      dialog_token;
        u8      query_data[1];
};

/**
 * struct brcmf_config_af_params - Action Frame Parameters for tx.
 *
 * @mpc_onoff: To make sure to send successfully action frame, we have to
 *             turn off mpc  0: off, 1: on,  (-1): do nothing
 * @search_channel: 1: search peer's channel to send af
 * extra_listen: keep the dwell time to get af response frame.
 */
struct brcmf_config_af_params {
        s32 mpc_onoff;
        bool search_channel;
        bool extra_listen;
};

/**
 * brcmf_p2p_is_pub_action() - true if p2p public type frame.
 *
 * @frame: action frame data.
 * @frame_len: length of action frame data.
 *
 * Determine if action frame is p2p public action type
 */
static bool brcmf_p2p_is_pub_action(void *frame, u32 frame_len)
{
        struct brcmf_p2p_pub_act_frame *pact_frm;

        if (frame == NULL)
                return false;

        pact_frm = (struct brcmf_p2p_pub_act_frame *)frame;
        if (frame_len < sizeof(struct brcmf_p2p_pub_act_frame) - 1)
                return false;

        if (pact_frm->category == P2P_PUB_AF_CATEGORY &&
            pact_frm->action == P2P_PUB_AF_ACTION &&
            pact_frm->oui_type == P2P_VER &&
            memcmp(pact_frm->oui, P2P_OUI, P2P_OUI_LEN) == 0)
                return true;

        return false;
}

/**
 * brcmf_p2p_is_p2p_action() - true if p2p action type frame.
 *
 * @frame: action frame data.
 * @frame_len: length of action frame data.
 *
 * Determine if action frame is p2p action type
 */
static bool brcmf_p2p_is_p2p_action(void *frame, u32 frame_len)
{
        struct brcmf_p2p_action_frame *act_frm;

        if (frame == NULL)
                return false;

        act_frm = (struct brcmf_p2p_action_frame *)frame;
        if (frame_len < sizeof(struct brcmf_p2p_action_frame) - 1)
                return false;

        if (act_frm->category == P2P_AF_CATEGORY &&
            act_frm->type  == P2P_VER &&
            memcmp(act_frm->oui, P2P_OUI, P2P_OUI_LEN) == 0)
                return true;

        return false;
}

/**
 * brcmf_p2p_is_gas_action() - true if p2p gas action type frame.
 *
 * @frame: action frame data.
 * @frame_len: length of action frame data.
 *
 * Determine if action frame is p2p gas action type
 */
static bool brcmf_p2p_is_gas_action(void *frame, u32 frame_len)
{
        struct brcmf_p2psd_gas_pub_act_frame *sd_act_frm;

        if (frame == NULL)
                return false;

        sd_act_frm = (struct brcmf_p2psd_gas_pub_act_frame *)frame;
        if (frame_len < sizeof(struct brcmf_p2psd_gas_pub_act_frame) - 1)
                return false;

        if (sd_act_frm->category != P2PSD_ACTION_CATEGORY)
                return false;

        if (sd_act_frm->action == P2PSD_ACTION_ID_GAS_IREQ ||
            sd_act_frm->action == P2PSD_ACTION_ID_GAS_IRESP ||
            sd_act_frm->action == P2PSD_ACTION_ID_GAS_CREQ ||
            sd_act_frm->action == P2PSD_ACTION_ID_GAS_CRESP)
                return true;

        return false;
}

/**
 * brcmf_p2p_print_actframe() - debug print routine.
 *
 * @tx: Received or to be transmitted
 * @frame: action frame data.
 * @frame_len: length of action frame data.
 *
 * Print information about the p2p action frame
 */

#ifdef DEBUG

static void brcmf_p2p_print_actframe(bool tx, void *frame, u32 frame_len)
{
        struct brcmf_p2p_pub_act_frame *pact_frm;
        struct brcmf_p2p_action_frame *act_frm;
        struct brcmf_p2psd_gas_pub_act_frame *sd_act_frm;

        if (!frame || frame_len <= 2)
                return;

        if (brcmf_p2p_is_pub_action(frame, frame_len)) {
                pact_frm = (struct brcmf_p2p_pub_act_frame *)frame;
                switch (pact_frm->subtype) {
                case P2P_PAF_GON_REQ:
                        brcmf_dbg(TRACE, "%s P2P Group Owner Negotiation Req Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_GON_RSP:
                        brcmf_dbg(TRACE, "%s P2P Group Owner Negotiation Rsp Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_GON_CONF:
                        brcmf_dbg(TRACE, "%s P2P Group Owner Negotiation Confirm Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_INVITE_REQ:
                        brcmf_dbg(TRACE, "%s P2P Invitation Request  Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_INVITE_RSP:
                        brcmf_dbg(TRACE, "%s P2P Invitation Response Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_DEVDIS_REQ:
                        brcmf_dbg(TRACE, "%s P2P Device Discoverability Request Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_DEVDIS_RSP:
                        brcmf_dbg(TRACE, "%s P2P Device Discoverability Response Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_PROVDIS_REQ:
                        brcmf_dbg(TRACE, "%s P2P Provision Discovery Request Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_PAF_PROVDIS_RSP:
                        brcmf_dbg(TRACE, "%s P2P Provision Discovery Response Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                default:
                        brcmf_dbg(TRACE, "%s Unknown P2P Public Action Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                }
        } else if (brcmf_p2p_is_p2p_action(frame, frame_len)) {
                act_frm = (struct brcmf_p2p_action_frame *)frame;
                switch (act_frm->subtype) {
                case P2P_AF_NOTICE_OF_ABSENCE:
                        brcmf_dbg(TRACE, "%s P2P Notice of Absence Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_AF_PRESENCE_REQ:
                        brcmf_dbg(TRACE, "%s P2P Presence Request Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_AF_PRESENCE_RSP:
                        brcmf_dbg(TRACE, "%s P2P Presence Response Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2P_AF_GO_DISC_REQ:
                        brcmf_dbg(TRACE, "%s P2P Discoverability Request Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                default:
                        brcmf_dbg(TRACE, "%s Unknown P2P Action Frame\n",
                                  (tx) ? "TX" : "RX");
                }

        } else if (brcmf_p2p_is_gas_action(frame, frame_len)) {
                sd_act_frm = (struct brcmf_p2psd_gas_pub_act_frame *)frame;
                switch (sd_act_frm->action) {
                case P2PSD_ACTION_ID_GAS_IREQ:
                        brcmf_dbg(TRACE, "%s P2P GAS Initial Request\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2PSD_ACTION_ID_GAS_IRESP:
                        brcmf_dbg(TRACE, "%s P2P GAS Initial Response\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2PSD_ACTION_ID_GAS_CREQ:
                        brcmf_dbg(TRACE, "%s P2P GAS Comback Request\n",
                                  (tx) ? "TX" : "RX");
                        break;
                case P2PSD_ACTION_ID_GAS_CRESP:
                        brcmf_dbg(TRACE, "%s P2P GAS Comback Response\n",
                                  (tx) ? "TX" : "RX");
                        break;
                default:
                        brcmf_dbg(TRACE, "%s Unknown P2P GAS Frame\n",
                                  (tx) ? "TX" : "RX");
                        break;
                }
        }
}

#else

static void brcmf_p2p_print_actframe(bool tx, void *frame, u32 frame_len)
{
}

#endif


/**
 * brcmf_p2p_set_firmware() - prepare firmware for peer-to-peer operation.
 *
 * @ifp: ifp to use for iovars (primary).
 * @p2p_mac: mac address to configure for p2p_da_override
 */
static int brcmf_p2p_set_firmware(struct brcmf_if *ifp, u8 *p2p_mac)
{
        s32 ret = 0;

        brcmf_fil_cmd_int_set(ifp, BRCMF_C_DOWN, 1);
        brcmf_fil_iovar_int_set(ifp, "apsta", 1);
        brcmf_fil_cmd_int_set(ifp, BRCMF_C_UP, 1);

        /* In case of COB type, firmware has default mac address
         * After Initializing firmware, we have to set current mac address to
         * firmware for P2P device address. This must be done with discovery
         * disabled.
         */
        brcmf_fil_iovar_int_set(ifp, "p2p_disc", 0);

        ret = brcmf_fil_iovar_data_set(ifp, "p2p_da_override", p2p_mac,
                                       ETH_ALEN);
        if (ret)
                brcmf_err("failed to update device address ret %d\n", ret);

        return ret;
}

/**
 * brcmf_p2p_generate_bss_mac() - derive mac addresses for P2P.
 *
 * @p2p: P2P specific data.
 * @dev_addr: optional device address.
 *
 * P2P needs mac addresses for P2P device and interface. If no device
 * address it specified, these are derived from the primary net device, ie.
 * the permanent ethernet address of the device.
 */
static void brcmf_p2p_generate_bss_mac(struct brcmf_p2p_info *p2p, u8 *dev_addr)
{
        struct brcmf_if *pri_ifp = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif->ifp;
        bool local_admin = false;

        if (!dev_addr || is_zero_ether_addr(dev_addr)) {
                dev_addr = pri_ifp->mac_addr;
                local_admin = true;
        }

        /* Generate the P2P Device Address.  This consists of the device's
         * primary MAC address with the locally administered bit set.
         */
        memcpy(p2p->dev_addr, dev_addr, ETH_ALEN);
        if (local_admin)
                p2p->dev_addr[0] |= 0x02;

        /* Generate the P2P Interface Address.  If the discovery and connection
         * BSSCFGs need to simultaneously co-exist, then this address must be
         * different from the P2P Device Address, but also locally administered.
         */
        memcpy(p2p->int_addr, p2p->dev_addr, ETH_ALEN);
        p2p->int_addr[0] |= 0x02;
        p2p->int_addr[4] ^= 0x80;
}

/**
 * brcmf_p2p_scan_is_p2p_request() - is cfg80211 scan request a P2P scan.
 *
 * @request: the scan request as received from cfg80211.
 *
 * returns true if one of the ssids in the request matches the
 * P2P wildcard ssid; otherwise returns false.
 */
static bool brcmf_p2p_scan_is_p2p_request(struct cfg80211_scan_request *request)
{
        struct cfg80211_ssid *ssids = request->ssids;
        int i;

        for (i = 0; i < request->n_ssids; i++) {
                if (ssids[i].ssid_len != BRCMF_P2P_WILDCARD_SSID_LEN)
                        continue;

                brcmf_dbg(INFO, "comparing ssid \"%s\"", ssids[i].ssid);
                if (!memcmp(BRCMF_P2P_WILDCARD_SSID, ssids[i].ssid,
                            BRCMF_P2P_WILDCARD_SSID_LEN))
                        return true;
        }
        return false;
}

/**
 * brcmf_p2p_set_discover_state - set discover state in firmware.
 *
 * @ifp: low-level interface object.
 * @state: discover state to set.
 * @chanspec: channel parameters (for state @WL_P2P_DISC_ST_LISTEN only).
 * @listen_ms: duration to listen (for state @WL_P2P_DISC_ST_LISTEN only).
 */
static s32 brcmf_p2p_set_discover_state(struct brcmf_if *ifp, u8 state,
                                        u16 chanspec, u16 listen_ms)
{
        struct brcmf_p2p_disc_st_le discover_state;
        s32 ret = 0;
        brcmf_dbg(TRACE, "enter\n");

        discover_state.state = state;
        discover_state.chspec = cpu_to_le16(chanspec);
        discover_state.dwell = cpu_to_le16(listen_ms);
        ret = brcmf_fil_bsscfg_data_set(ifp, "p2p_state", &discover_state,
                                        sizeof(discover_state));
        return ret;
}

/**
 * brcmf_p2p_deinit_discovery() - disable P2P device discovery.
 *
 * @p2p: P2P specific data.
 *
 * Resets the discovery state and disables it in firmware.
 */
static s32 brcmf_p2p_deinit_discovery(struct brcmf_p2p_info *p2p)
{
        struct brcmf_cfg80211_vif *vif;

        brcmf_dbg(TRACE, "enter\n");

        /* Set the discovery state to SCAN */
        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        (void)brcmf_p2p_set_discover_state(vif->ifp, WL_P2P_DISC_ST_SCAN, 0, 0);

        /* Disable P2P discovery in the firmware */
        vif = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif;
        (void)brcmf_fil_iovar_int_set(vif->ifp, "p2p_disc", 0);

        return 0;
}

/**
 * brcmf_p2p_enable_discovery() - initialize and configure discovery.
 *
 * @p2p: P2P specific data.
 *
 * Initializes the discovery device and configure the virtual interface.
 */
static int brcmf_p2p_enable_discovery(struct brcmf_p2p_info *p2p)
{
        struct brcmf_cfg80211_vif *vif;
        s32 ret = 0;

        brcmf_dbg(TRACE, "enter\n");
        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        if (!vif) {
                brcmf_err("P2P config device not available\n");
                ret = -EPERM;
                goto exit;
        }

        if (test_bit(BRCMF_P2P_STATUS_ENABLED, &p2p->status)) {
                brcmf_dbg(INFO, "P2P config device already configured\n");
                goto exit;
        }

        /* Re-initialize P2P Discovery in the firmware */
        vif = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif;
        ret = brcmf_fil_iovar_int_set(vif->ifp, "p2p_disc", 1);
        if (ret < 0) {
                brcmf_err("set p2p_disc error\n");
                goto exit;
        }
        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        ret = brcmf_p2p_set_discover_state(vif->ifp, WL_P2P_DISC_ST_SCAN, 0, 0);
        if (ret < 0) {
                brcmf_err("unable to set WL_P2P_DISC_ST_SCAN\n");
                goto exit;
        }

        /*
         * Set wsec to any non-zero value in the discovery bsscfg
         * to ensure our P2P probe responses have the privacy bit
         * set in the 802.11 WPA IE. Some peer devices may not
         * initiate WPS with us if this bit is not set.
         */
        ret = brcmf_fil_bsscfg_int_set(vif->ifp, "wsec", AES_ENABLED);
        if (ret < 0) {
                brcmf_err("wsec error %d\n", ret);
                goto exit;
        }

        set_bit(BRCMF_P2P_STATUS_ENABLED, &p2p->status);
exit:
        return ret;
}

/**
 * brcmf_p2p_escan() - initiate a P2P scan.
 *
 * @p2p: P2P specific data.
 * @num_chans: number of channels to scan.
 * @chanspecs: channel parameters for @num_chans channels.
 * @search_state: P2P discover state to use.
 * @action: scan action to pass to firmware.
 * @bss_type: type of P2P bss.
 */
static s32 brcmf_p2p_escan(struct brcmf_p2p_info *p2p, u32 num_chans,
                           u16 chanspecs[], s32 search_state, u16 action,
                           enum p2p_bss_type bss_type)
{
        s32 ret = 0;
        s32 memsize = offsetof(struct brcmf_p2p_scan_le,
                               eparams.params_le.channel_list);
        s32 nprobes;
        s32 active;
        u32 i;
        u8 *memblk;
        struct brcmf_cfg80211_vif *vif;
        struct brcmf_p2p_scan_le *p2p_params;
        struct brcmf_scan_params_le *sparams;
        struct brcmf_ssid ssid;

        memsize += num_chans * sizeof(__le16);
        memblk = kzalloc(memsize, GFP_KERNEL);
        if (!memblk)
                return -ENOMEM;

        vif = p2p->bss_idx[bss_type].vif;
        if (vif == NULL) {
                brcmf_err("no vif for bss type %d\n", bss_type);
                ret = -EINVAL;
                goto exit;
        }

        switch (search_state) {
        case WL_P2P_DISC_ST_SEARCH:
                /*
                 * If we in SEARCH STATE, we don't need to set SSID explictly
                 * because dongle use P2P WILDCARD internally by default
                 */
                /* use null ssid */
                ssid.SSID_len = 0;
                memset(ssid.SSID, 0, sizeof(ssid.SSID));
                break;
        case WL_P2P_DISC_ST_SCAN:
                /*
                 * wpa_supplicant has p2p_find command with type social or
                 * progressive. For progressive, we need to set the ssid to
                 * P2P WILDCARD because we just do broadcast scan unless
                 * setting SSID.
                 */
                ssid.SSID_len = BRCMF_P2P_WILDCARD_SSID_LEN;
                memcpy(ssid.SSID, BRCMF_P2P_WILDCARD_SSID, ssid.SSID_len);
                break;
        default:
                brcmf_err(" invalid search state %d\n", search_state);
                ret = -EINVAL;
                goto exit;
        }

        brcmf_p2p_set_discover_state(vif->ifp, search_state, 0, 0);

        /*
         * set p2p scan parameters.
         */
        p2p_params = (struct brcmf_p2p_scan_le *)memblk;
        p2p_params->type = 'E';

        /* determine the scan engine parameters */
        sparams = &p2p_params->eparams.params_le;
        sparams->bss_type = DOT11_BSSTYPE_ANY;
        if (p2p->cfg->active_scan)
                sparams->scan_type = 0;
        else
                sparams->scan_type = 1;

        eth_broadcast_addr(sparams->bssid);
        if (ssid.SSID_len)
                memcpy(sparams->ssid_le.SSID, ssid.SSID, ssid.SSID_len);
        sparams->ssid_le.SSID_len = cpu_to_le32(ssid.SSID_len);
        sparams->home_time = cpu_to_le32(P2PAPI_SCAN_HOME_TIME_MS);

        /*
         * SOCIAL_CHAN_CNT + 1 takes care of the Progressive scan
         * supported by the supplicant.
         */
        if (num_chans == SOCIAL_CHAN_CNT || num_chans == (SOCIAL_CHAN_CNT + 1))
                active = P2PAPI_SCAN_SOCIAL_DWELL_TIME_MS;
        else if (num_chans == AF_PEER_SEARCH_CNT)
                active = P2PAPI_SCAN_AF_SEARCH_DWELL_TIME_MS;
        else if (brcmf_get_vif_state_any(p2p->cfg, BRCMF_VIF_STATUS_CONNECTED))
                active = -1;
        else
                active = P2PAPI_SCAN_DWELL_TIME_MS;

        /* Override scan params to find a peer for a connection */
        if (num_chans == 1) {
                active = WL_SCAN_CONNECT_DWELL_TIME_MS;
                /* WAR to sync with presence period of VSDB GO.
                 * send probe request more frequently
                 */
                nprobes = active / WL_SCAN_JOIN_PROBE_INTERVAL_MS;
        } else {
                nprobes = active / P2PAPI_SCAN_NPROBS_TIME_MS;
        }

        if (nprobes <= 0)
                nprobes = 1;

        brcmf_dbg(INFO, "nprobes # %d, active_time %d\n", nprobes, active);
        sparams->active_time = cpu_to_le32(active);
        sparams->nprobes = cpu_to_le32(nprobes);
        sparams->passive_time = cpu_to_le32(-1);
        sparams->channel_num = cpu_to_le32(num_chans &
                                           BRCMF_SCAN_PARAMS_COUNT_MASK);
        for (i = 0; i < num_chans; i++)
                sparams->channel_list[i] = cpu_to_le16(chanspecs[i]);

        /* set the escan specific parameters */
        p2p_params->eparams.version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION);
        p2p_params->eparams.action =  cpu_to_le16(action);
        p2p_params->eparams.sync_id = cpu_to_le16(0x1234);
        /* perform p2p scan on primary device */
        ret = brcmf_fil_bsscfg_data_set(vif->ifp, "p2p_scan", memblk, memsize);
        if (!ret)
                set_bit(BRCMF_SCAN_STATUS_BUSY, &p2p->cfg->scan_status);
exit:
        kfree(memblk);
        return ret;
}

/**
 * brcmf_p2p_run_escan() - escan callback for peer-to-peer.
 *
 * @cfg: driver private data for cfg80211 interface.
 * @ndev: net device for which scan is requested.
 * @request: scan request from cfg80211.
 * @action: scan action.
 *
 * Determines the P2P discovery state based to scan request parameters and
 * validates the channels in the request.
 */
static s32 brcmf_p2p_run_escan(struct brcmf_cfg80211_info *cfg,
                               struct brcmf_if *ifp,
                               struct cfg80211_scan_request *request,
                               u16 action)
{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        s32 err = 0;
        s32 search_state = WL_P2P_DISC_ST_SCAN;
        struct brcmf_cfg80211_vif *vif;
        struct net_device *dev = NULL;
        int i, num_nodfs = 0;
        u16 *chanspecs;

        brcmf_dbg(TRACE, "enter\n");

        if (!request) {
                err = -EINVAL;
                goto exit;
        }

        if (request->n_channels) {
                chanspecs = kcalloc(request->n_channels, sizeof(*chanspecs),
                                    GFP_KERNEL);
                if (!chanspecs) {
                        err = -ENOMEM;
                        goto exit;
                }
                vif = p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif;
                if (vif)
                        dev = vif->wdev.netdev;
                if (request->n_channels == 3 &&
                    request->channels[0]->hw_value == SOCIAL_CHAN_1 &&
                    request->channels[1]->hw_value == SOCIAL_CHAN_2 &&
                    request->channels[2]->hw_value == SOCIAL_CHAN_3) {
                        /* SOCIAL CHANNELS 1, 6, 11 */
                        search_state = WL_P2P_DISC_ST_SEARCH;
                        brcmf_dbg(INFO, "P2P SEARCH PHASE START\n");
                } else if (dev != NULL &&
                           vif->wdev.iftype == NL80211_IFTYPE_P2P_GO) {
                        /* If you are already a GO, then do SEARCH only */
                        brcmf_dbg(INFO, "Already a GO. Do SEARCH Only\n");
                        search_state = WL_P2P_DISC_ST_SEARCH;
                } else {
                        brcmf_dbg(INFO, "P2P SCAN STATE START\n");
                }

                /*
                 * no P2P scanning on passive or DFS channels.
                 */
                for (i = 0; i < request->n_channels; i++) {
                        struct ieee80211_channel *chan = request->channels[i];

                        if (chan->flags & (IEEE80211_CHAN_RADAR |
                                           IEEE80211_CHAN_NO_IR))
                                continue;

                        chanspecs[i] = channel_to_chanspec(&p2p->cfg->d11inf,
                                                           chan);
                        brcmf_dbg(INFO, "%d: chan=%d, channel spec=%x\n",
                                  num_nodfs, chan->hw_value, chanspecs[i]);
                        num_nodfs++;
                }
                err = brcmf_p2p_escan(p2p, num_nodfs, chanspecs, search_state,
                                      action, P2PAPI_BSSCFG_DEVICE);
                kfree(chanspecs);
        }
exit:
        if (err)
                brcmf_err("error (%d)\n", err);
        return err;
}


/**
 * brcmf_p2p_find_listen_channel() - find listen channel in ie string.
 *
 * @ie: string of information elements.
 * @ie_len: length of string.
 *
 * Scan ie for p2p ie and look for attribute 6 channel. If available determine
 * channel and return it.
 */
static s32 brcmf_p2p_find_listen_channel(const u8 *ie, u32 ie_len)
{
        u8 channel_ie[5];
        s32 listen_channel;
        s32 err;

        err = cfg80211_get_p2p_attr(ie, ie_len,
                                    IEEE80211_P2P_ATTR_LISTEN_CHANNEL,
                                    channel_ie, sizeof(channel_ie));
        if (err < 0)
                return err;

        /* listen channel subel length format:     */
        /* 3(country) + 1(op. class) + 1(chan num) */
        listen_channel = (s32)channel_ie[3 + 1];

        if (listen_channel == SOCIAL_CHAN_1 ||
            listen_channel == SOCIAL_CHAN_2 ||
            listen_channel == SOCIAL_CHAN_3) {
                brcmf_dbg(INFO, "Found my Listen Channel %d\n", listen_channel);
                return listen_channel;
        }

        return -EPERM;
}


/**
 * brcmf_p2p_scan_prep() - prepare scan based on request.
 *
 * @wiphy: wiphy device.
 * @request: scan request from cfg80211.
 * @vif: vif on which scan request is to be executed.
 *
 * Prepare the scan appropriately for type of scan requested. Overrides the
 * escan .run() callback for peer-to-peer scanning.
 */
int brcmf_p2p_scan_prep(struct wiphy *wiphy,
                        struct cfg80211_scan_request *request,
                        struct brcmf_cfg80211_vif *vif)
{
        struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        int err = 0;

        if (brcmf_p2p_scan_is_p2p_request(request)) {
                /* find my listen channel */
                err = brcmf_p2p_find_listen_channel(request->ie,
                                                    request->ie_len);
                if (err < 0)
                        return err;

                p2p->afx_hdl.my_listen_chan = err;

                clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
                brcmf_dbg(INFO, "P2P: GO_NEG_PHASE status cleared\n");

                err = brcmf_p2p_enable_discovery(p2p);
                if (err)
                        return err;

                vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;

                /* override .run_escan() callback. */
                cfg->escan_info.run = brcmf_p2p_run_escan;
        }
        err = brcmf_vif_set_mgmt_ie(vif, BRCMF_VNDR_IE_PRBREQ_FLAG,
                                    request->ie, request->ie_len);
        return err;
}


/**
 * brcmf_p2p_discover_listen() - set firmware to discover listen state.
 *
 * @p2p: p2p device.
 * @channel: channel nr for discover listen.
 * @duration: time in ms to stay on channel.
 *
 */
static s32
brcmf_p2p_discover_listen(struct brcmf_p2p_info *p2p, u16 channel, u32 duration)
{
        struct brcmf_cfg80211_vif *vif;
        struct brcmu_chan ch;
        s32 err = 0;

        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        if (!vif) {
                brcmf_err("Discovery is not set, so we have nothing to do\n");
                err = -EPERM;
                goto exit;
        }

        if (test_bit(BRCMF_P2P_STATUS_DISCOVER_LISTEN, &p2p->status)) {
                brcmf_err("Previous LISTEN is not completed yet\n");
                /* WAR: prevent cookie mismatch in wpa_supplicant return OK */
                goto exit;
        }

        ch.chnum = channel;
        ch.bw = BRCMU_CHAN_BW_20;
        p2p->cfg->d11inf.encchspec(&ch);
        err = brcmf_p2p_set_discover_state(vif->ifp, WL_P2P_DISC_ST_LISTEN,
                                           ch.chspec, (u16)duration);
        if (!err) {
                set_bit(BRCMF_P2P_STATUS_DISCOVER_LISTEN, &p2p->status);
                p2p->remain_on_channel_cookie++;
        }
exit:
        return err;
}


/**
 * brcmf_p2p_remain_on_channel() - put device on channel and stay there.
 *
 * @wiphy: wiphy device.
 * @channel: channel to stay on.
 * @duration: time in ms to remain on channel.
 *
 */
int brcmf_p2p_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev,
                                struct ieee80211_channel *channel,
                                unsigned int duration, u64 *cookie)
{
        struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        s32 err;
        u16 channel_nr;

        channel_nr = ieee80211_frequency_to_channel(channel->center_freq);
        brcmf_dbg(TRACE, "Enter, channel: %d, duration ms (%d)\n", channel_nr,
                  duration);

        err = brcmf_p2p_enable_discovery(p2p);
        if (err)
                goto exit;
        err = brcmf_p2p_discover_listen(p2p, channel_nr, duration);
        if (err)
                goto exit;

        memcpy(&p2p->remain_on_channel, channel, sizeof(*channel));
        *cookie = p2p->remain_on_channel_cookie;
        cfg80211_ready_on_channel(wdev, *cookie, channel, duration, GFP_KERNEL);

exit:
        return err;
}


/**
 * brcmf_p2p_notify_listen_complete() - p2p listen has completed.
 *
 * @ifp: interfac control.
 * @e: event message. Not used, to make it usable for fweh event dispatcher.
 * @data: payload of message. Not used.
 *
 */
int brcmf_p2p_notify_listen_complete(struct brcmf_if *ifp,
                                     const struct brcmf_event_msg *e,
                                     void *data)
{
        struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
        struct brcmf_p2p_info *p2p = &cfg->p2p;

        brcmf_dbg(TRACE, "Enter\n");
        if (test_and_clear_bit(BRCMF_P2P_STATUS_DISCOVER_LISTEN,
                               &p2p->status)) {
                if (test_and_clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_AF_LISTEN,
                                       &p2p->status)) {
                        clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME,
                                  &p2p->status);
                        brcmf_dbg(INFO, "Listen DONE, wake up wait_next_af\n");
                        complete(&p2p->wait_next_af);
                }

                cfg80211_remain_on_channel_expired(&ifp->vif->wdev,
                                                   p2p->remain_on_channel_cookie,
                                                   &p2p->remain_on_channel,
                                                   GFP_KERNEL);
        }
        return 0;
}


/**
 * brcmf_p2p_cancel_remain_on_channel() - cancel p2p listen state.
 *
 * @ifp: interfac control.
 *
 */
void brcmf_p2p_cancel_remain_on_channel(struct brcmf_if *ifp)
{
        if (!ifp)
                return;
        brcmf_p2p_set_discover_state(ifp, WL_P2P_DISC_ST_SCAN, 0, 0);
        brcmf_p2p_notify_listen_complete(ifp, NULL, NULL);
}


/**
 * brcmf_p2p_act_frm_search() - search function for action frame.
 *
 * @p2p: p2p device.
 * channel: channel on which action frame is to be trasmitted.
 *
 * search function to reach at common channel to send action frame. When
 * channel is 0 then all social channels will be used to send af
 */
static s32 brcmf_p2p_act_frm_search(struct brcmf_p2p_info *p2p, u16 channel)
{
        s32 err;
        u32 channel_cnt;
        u16 *default_chan_list;
        u32 i;
        struct brcmu_chan ch;

        brcmf_dbg(TRACE, "Enter\n");

        if (channel)
                channel_cnt = AF_PEER_SEARCH_CNT;
        else
                channel_cnt = SOCIAL_CHAN_CNT;
        default_chan_list = kzalloc(channel_cnt * sizeof(*default_chan_list),
                                    GFP_KERNEL);
        if (default_chan_list == NULL) {
                brcmf_err("channel list allocation failed\n");
                err = -ENOMEM;
                goto exit;
        }
        ch.bw = BRCMU_CHAN_BW_20;
        if (channel) {
                ch.chnum = channel;
                p2p->cfg->d11inf.encchspec(&ch);
                /* insert same channel to the chan_list */
                for (i = 0; i < channel_cnt; i++)
                        default_chan_list[i] = ch.chspec;
        } else {
                ch.chnum = SOCIAL_CHAN_1;
                p2p->cfg->d11inf.encchspec(&ch);
                default_chan_list[0] = ch.chspec;
                ch.chnum = SOCIAL_CHAN_2;
                p2p->cfg->d11inf.encchspec(&ch);
                default_chan_list[1] = ch.chspec;
                ch.chnum = SOCIAL_CHAN_3;
                p2p->cfg->d11inf.encchspec(&ch);
                default_chan_list[2] = ch.chspec;
        }
        err = brcmf_p2p_escan(p2p, channel_cnt, default_chan_list,
                              WL_P2P_DISC_ST_SEARCH, WL_ESCAN_ACTION_START,
                              P2PAPI_BSSCFG_DEVICE);
        kfree(default_chan_list);
exit:
        return err;
}


/**
 * brcmf_p2p_afx_handler() - afx worker thread.
 *
 * @work:
 *
 */
static void brcmf_p2p_afx_handler(struct work_struct *work)
{
        struct afx_hdl *afx_hdl = container_of(work, struct afx_hdl, afx_work);
        struct brcmf_p2p_info *p2p = container_of(afx_hdl,
                                                  struct brcmf_p2p_info,
                                                  afx_hdl);
        s32 err;

        if (!afx_hdl->is_active)
                return;

        if (afx_hdl->is_listen && afx_hdl->my_listen_chan)
                /* 100ms ~ 300ms */
                err = brcmf_p2p_discover_listen(p2p, afx_hdl->my_listen_chan,
                                                100 * (1 + prandom_u32() % 3));
        else
                err = brcmf_p2p_act_frm_search(p2p, afx_hdl->peer_listen_chan);

        if (err) {
                brcmf_err("ERROR occurred! value is (%d)\n", err);
                if (test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
                             &p2p->status))
                        complete(&afx_hdl->act_frm_scan);
        }
}


/**
 * brcmf_p2p_af_searching_channel() - search channel.
 *
 * @p2p: p2p device info struct.
 *
 */
static s32 brcmf_p2p_af_searching_channel(struct brcmf_p2p_info *p2p)
{
        struct afx_hdl *afx_hdl = &p2p->afx_hdl;
        struct brcmf_cfg80211_vif *pri_vif;
        unsigned long duration;
        s32 retry;

        brcmf_dbg(TRACE, "Enter\n");

        pri_vif = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif;

        reinit_completion(&afx_hdl->act_frm_scan);
        set_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL, &p2p->status);
        afx_hdl->is_active = true;
        afx_hdl->peer_chan = P2P_INVALID_CHANNEL;

        /* Loop to wait until we find a peer's channel or the
         * pending action frame tx is cancelled.
         */
        retry = 0;
        duration = msecs_to_jiffies(P2P_AF_FRM_SCAN_MAX_WAIT);
        while ((retry < P2P_CHANNEL_SYNC_RETRY) &&
               (afx_hdl->peer_chan == P2P_INVALID_CHANNEL)) {
                afx_hdl->is_listen = false;
                brcmf_dbg(TRACE, "Scheduling action frame for sending.. (%d)\n",
                          retry);
                /* search peer on peer's listen channel */
                schedule_work(&afx_hdl->afx_work);
                wait_for_completion_timeout(&afx_hdl->act_frm_scan, duration);
                if ((afx_hdl->peer_chan != P2P_INVALID_CHANNEL) ||
                    (!test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
                               &p2p->status)))
                        break;

                if (afx_hdl->my_listen_chan) {
                        brcmf_dbg(TRACE, "Scheduling listen peer, channel=%d\n",
                                  afx_hdl->my_listen_chan);
                        /* listen on my listen channel */
                        afx_hdl->is_listen = true;
                        schedule_work(&afx_hdl->afx_work);
                        wait_for_completion_timeout(&afx_hdl->act_frm_scan,
                                                    duration);
                }
                if ((afx_hdl->peer_chan != P2P_INVALID_CHANNEL) ||
                    (!test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
                               &p2p->status)))
                        break;
                retry++;

                /* if sta is connected or connecting, sleep for a while before
                 * retry af tx or finding a peer
                 */
                if (test_bit(BRCMF_VIF_STATUS_CONNECTED, &pri_vif->sme_state) ||
                    test_bit(BRCMF_VIF_STATUS_CONNECTING, &pri_vif->sme_state))
                        msleep(P2P_DEFAULT_SLEEP_TIME_VSDB);
        }

        brcmf_dbg(TRACE, "Completed search/listen peer_chan=%d\n",
                  afx_hdl->peer_chan);
        afx_hdl->is_active = false;

        clear_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL, &p2p->status);

        return afx_hdl->peer_chan;
}


/**
 * brcmf_p2p_scan_finding_common_channel() - was escan used for finding channel
 *
 * @cfg: common configuration struct.
 * @bi: bss info struct, result from scan.
 *
 */
bool brcmf_p2p_scan_finding_common_channel(struct brcmf_cfg80211_info *cfg,
                                           struct brcmf_bss_info_le *bi)

{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct afx_hdl *afx_hdl = &p2p->afx_hdl;
        struct brcmu_chan ch;
        u8 *ie;
        s32 err;
        u8 p2p_dev_addr[ETH_ALEN];

        if (!test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL, &p2p->status))
                return false;

        if (bi == NULL) {
                brcmf_dbg(TRACE, "ACTION FRAME SCAN Done\n");
                if (afx_hdl->peer_chan == P2P_INVALID_CHANNEL)
                        complete(&afx_hdl->act_frm_scan);
                return true;
        }

        ie = ((u8 *)bi) + le16_to_cpu(bi->ie_offset);
        memset(p2p_dev_addr, 0, sizeof(p2p_dev_addr));
        err = cfg80211_get_p2p_attr(ie, le32_to_cpu(bi->ie_length),
                                    IEEE80211_P2P_ATTR_DEVICE_INFO,
                                    p2p_dev_addr, sizeof(p2p_dev_addr));
        if (err < 0)
                err = cfg80211_get_p2p_attr(ie, le32_to_cpu(bi->ie_length),
                                            IEEE80211_P2P_ATTR_DEVICE_ID,
                                            p2p_dev_addr, sizeof(p2p_dev_addr));
        if ((err >= 0) &&
            (ether_addr_equal(p2p_dev_addr, afx_hdl->tx_dst_addr))) {
                if (!bi->ctl_ch) {
                        ch.chspec = le16_to_cpu(bi->chanspec);
                        cfg->d11inf.decchspec(&ch);
                        bi->ctl_ch = ch.chnum;
                }
                afx_hdl->peer_chan = bi->ctl_ch;
                brcmf_dbg(TRACE, "ACTION FRAME SCAN : Peer %pM found, channel : %d\n",
                          afx_hdl->tx_dst_addr, afx_hdl->peer_chan);
                complete(&afx_hdl->act_frm_scan);
        }
        return true;
}

/**
 * brcmf_p2p_stop_wait_next_action_frame() - finish scan if af tx complete.
 *
 * @cfg: common configuration struct.
 *
 */
static void
brcmf_p2p_stop_wait_next_action_frame(struct brcmf_cfg80211_info *cfg)
{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_if *ifp = cfg->escan_info.ifp;

        if (test_bit(BRCMF_P2P_STATUS_SENDING_ACT_FRAME, &p2p->status) &&
            (test_bit(BRCMF_P2P_STATUS_ACTION_TX_COMPLETED, &p2p->status) ||
             test_bit(BRCMF_P2P_STATUS_ACTION_TX_NOACK, &p2p->status))) {
                brcmf_dbg(TRACE, "*** Wake UP ** abort actframe iovar\n");
                /* if channel is not zero, "actfame" uses off channel scan.
                 * So abort scan for off channel completion.
                 */
                if (p2p->af_sent_channel)
                        brcmf_notify_escan_complete(cfg, ifp, true, true);
        } else if (test_bit(BRCMF_P2P_STATUS_WAITING_NEXT_AF_LISTEN,
                            &p2p->status)) {
                brcmf_dbg(TRACE, "*** Wake UP ** abort listen for next af frame\n");
                /* So abort scan to cancel listen */
                brcmf_notify_escan_complete(cfg, ifp, true, true);
        }
}


/**
 * brcmf_p2p_gon_req_collision() - Check if go negotiaton collission
 *
 * @p2p: p2p device info struct.
 *
 * return true if recevied action frame is to be dropped.
 */
static bool
brcmf_p2p_gon_req_collision(struct brcmf_p2p_info *p2p, u8 *mac)
{
        struct brcmf_cfg80211_info *cfg = p2p->cfg;
        struct brcmf_if *ifp;

        brcmf_dbg(TRACE, "Enter\n");

        if (!test_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME, &p2p->status) ||
            !p2p->gon_req_action)
                return false;

        brcmf_dbg(TRACE, "GO Negotiation Request COLLISION !!!\n");
        /* if sa(peer) addr is less than da(my) addr, then this device
         * process peer's gon request and block to send gon req.
         * if not (sa addr > da addr),
         * this device will process gon request and drop gon req of peer.
         */
        ifp = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif->ifp;
        if (memcmp(mac, ifp->mac_addr, ETH_ALEN) < 0) {
                brcmf_dbg(INFO, "Block transmit gon req !!!\n");
                p2p->block_gon_req_tx = true;
                /* if we are finding a common channel for sending af,
                 * do not scan more to block to send current gon req
                 */
                if (test_and_clear_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
                                       &p2p->status))
                        complete(&p2p->afx_hdl.act_frm_scan);
                if (test_and_clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME,
                                       &p2p->status))
                        brcmf_p2p_stop_wait_next_action_frame(cfg);
                return false;
        }

        /* drop gon request of peer to process gon request by this device. */
        brcmf_dbg(INFO, "Drop received gon req !!!\n");

        return true;
}


/**
 * brcmf_p2p_notify_action_frame_rx() - received action frame.
 *
 * @ifp: interfac control.
 * @e: event message. Not used, to make it usable for fweh event dispatcher.
 * @data: payload of message, containing action frame data.
 *
 */
int brcmf_p2p_notify_action_frame_rx(struct brcmf_if *ifp,
                                     const struct brcmf_event_msg *e,
                                     void *data)
{
        struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct afx_hdl *afx_hdl = &p2p->afx_hdl;
        struct wireless_dev *wdev;
        u32 mgmt_frame_len = e->datalen - sizeof(struct brcmf_rx_mgmt_data);
        struct brcmf_rx_mgmt_data *rxframe = (struct brcmf_rx_mgmt_data *)data;
        u8 *frame = (u8 *)(rxframe + 1);
        struct brcmf_p2p_pub_act_frame *act_frm;
        struct brcmf_p2psd_gas_pub_act_frame *sd_act_frm;
        struct brcmu_chan ch;
        struct ieee80211_mgmt *mgmt_frame;
        s32 freq;
        u16 mgmt_type;
        u8 action;

        ch.chspec = be16_to_cpu(rxframe->chanspec);
        cfg->d11inf.decchspec(&ch);
        /* Check if wpa_supplicant has registered for this frame */
        brcmf_dbg(INFO, "ifp->vif->mgmt_rx_reg %04x\n", ifp->vif->mgmt_rx_reg);
        mgmt_type = (IEEE80211_STYPE_ACTION & IEEE80211_FCTL_STYPE) >> 4;
        if ((ifp->vif->mgmt_rx_reg & BIT(mgmt_type)) == 0)
                return 0;

        brcmf_p2p_print_actframe(false, frame, mgmt_frame_len);

        action = P2P_PAF_SUBTYPE_INVALID;
        if (brcmf_p2p_is_pub_action(frame, mgmt_frame_len)) {
                act_frm = (struct brcmf_p2p_pub_act_frame *)frame;
                action = act_frm->subtype;
                if ((action == P2P_PAF_GON_REQ) &&
                    (brcmf_p2p_gon_req_collision(p2p, (u8 *)e->addr))) {
                        if (test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL,
                                     &p2p->status) &&
                            (ether_addr_equal(afx_hdl->tx_dst_addr, e->addr))) {
                                afx_hdl->peer_chan = ch.chnum;
                                brcmf_dbg(INFO, "GON request: Peer found, channel=%d\n",
                                          afx_hdl->peer_chan);
                                complete(&afx_hdl->act_frm_scan);
                        }
                        return 0;
                }
                /* After complete GO Negotiation, roll back to mpc mode */
                if ((action == P2P_PAF_GON_CONF) ||
                    (action == P2P_PAF_PROVDIS_RSP))
                        brcmf_set_mpc(ifp, 1);
                if (action == P2P_PAF_GON_CONF) {
                        brcmf_dbg(TRACE, "P2P: GO_NEG_PHASE status cleared\n");
                        clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
                }
        } else if (brcmf_p2p_is_gas_action(frame, mgmt_frame_len)) {
                sd_act_frm = (struct brcmf_p2psd_gas_pub_act_frame *)frame;
                action = sd_act_frm->action;
        }

        if (test_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME, &p2p->status) &&
            (p2p->next_af_subtype == action)) {
                brcmf_dbg(TRACE, "We got a right next frame! (%d)\n", action);
                clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME,
                          &p2p->status);
                /* Stop waiting for next AF. */
                brcmf_p2p_stop_wait_next_action_frame(cfg);
        }

        mgmt_frame = kzalloc(offsetof(struct ieee80211_mgmt, u) +
                             mgmt_frame_len, GFP_KERNEL);
        if (!mgmt_frame) {
                brcmf_err("No memory available for action frame\n");
                return -ENOMEM;
        }
        memcpy(mgmt_frame->da, ifp->mac_addr, ETH_ALEN);
        brcmf_fil_cmd_data_get(ifp, BRCMF_C_GET_BSSID, mgmt_frame->bssid,
                               ETH_ALEN);
        memcpy(mgmt_frame->sa, e->addr, ETH_ALEN);
        mgmt_frame->frame_control = cpu_to_le16(IEEE80211_STYPE_ACTION);
        memcpy(&mgmt_frame->u, frame, mgmt_frame_len);
        mgmt_frame_len += offsetof(struct ieee80211_mgmt, u);

        freq = ieee80211_channel_to_frequency(ch.chnum,
                                              ch.band == BRCMU_CHAN_BAND_2G ?
                                              IEEE80211_BAND_2GHZ :
                                              IEEE80211_BAND_5GHZ);

        wdev = &ifp->vif->wdev;
        cfg80211_rx_mgmt(wdev, freq, 0, (u8 *)mgmt_frame, mgmt_frame_len, 0);

        kfree(mgmt_frame);
        return 0;
}


/**
 * brcmf_p2p_notify_action_tx_complete() - transmit action frame complete
 *
 * @ifp: interfac control.
 * @e: event message. Not used, to make it usable for fweh event dispatcher.
 * @data: not used.
 *
 */
int brcmf_p2p_notify_action_tx_complete(struct brcmf_if *ifp,
                                        const struct brcmf_event_msg *e,
                                        void *data)
{
        struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
        struct brcmf_p2p_info *p2p = &cfg->p2p;

        brcmf_dbg(INFO, "Enter: event %s, status=%d\n",
                  e->event_code == BRCMF_E_ACTION_FRAME_OFF_CHAN_COMPLETE ?
                  "ACTION_FRAME_OFF_CHAN_COMPLETE" : "ACTION_FRAME_COMPLETE",
                  e->status);

        if (!test_bit(BRCMF_P2P_STATUS_SENDING_ACT_FRAME, &p2p->status))
                return 0;

        if (e->event_code == BRCMF_E_ACTION_FRAME_COMPLETE) {
                if (e->status == BRCMF_E_STATUS_SUCCESS)
                        set_bit(BRCMF_P2P_STATUS_ACTION_TX_COMPLETED,
                                &p2p->status);
                else {
                        set_bit(BRCMF_P2P_STATUS_ACTION_TX_NOACK, &p2p->status);
                        /* If there is no ack, we don't need to wait for
                         * WLC_E_ACTION_FRAME_OFFCHAN_COMPLETE event
                         */
                        brcmf_p2p_stop_wait_next_action_frame(cfg);
                }

        } else {
                complete(&p2p->send_af_done);
        }
        return 0;
}


/**
 * brcmf_p2p_tx_action_frame() - send action frame over fil.
 *
 * @p2p: p2p info struct for vif.
 * @af_params: action frame data/info.
 *
 * Send an action frame immediately without doing channel synchronization.
 *
 * This function waits for a completion event before returning.
 * The WLC_E_ACTION_FRAME_COMPLETE event will be received when the action
 * frame is transmitted.
 */
static s32 brcmf_p2p_tx_action_frame(struct brcmf_p2p_info *p2p,
                                     struct brcmf_fil_af_params_le *af_params)
{
        struct brcmf_cfg80211_vif *vif;
        s32 err = 0;
        s32 timeout = 0;

        brcmf_dbg(TRACE, "Enter\n");

        reinit_completion(&p2p->send_af_done);
        clear_bit(BRCMF_P2P_STATUS_ACTION_TX_COMPLETED, &p2p->status);
        clear_bit(BRCMF_P2P_STATUS_ACTION_TX_NOACK, &p2p->status);

        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        err = brcmf_fil_bsscfg_data_set(vif->ifp, "actframe", af_params,
                                        sizeof(*af_params));
        if (err) {
                brcmf_err(" sending action frame has failed\n");
                goto exit;
        }

        p2p->af_sent_channel = le32_to_cpu(af_params->channel);
        p2p->af_tx_sent_jiffies = jiffies;

        timeout = wait_for_completion_timeout(&p2p->send_af_done,
                                        msecs_to_jiffies(P2P_AF_MAX_WAIT_TIME));

        if (test_bit(BRCMF_P2P_STATUS_ACTION_TX_COMPLETED, &p2p->status)) {
                brcmf_dbg(TRACE, "TX action frame operation is success\n");
        } else {
                err = -EIO;
                brcmf_dbg(TRACE, "TX action frame operation has failed\n");
        }
        /* clear status bit for action tx */
        clear_bit(BRCMF_P2P_STATUS_ACTION_TX_COMPLETED, &p2p->status);
        clear_bit(BRCMF_P2P_STATUS_ACTION_TX_NOACK, &p2p->status);

exit:
        return err;
}


/**
 * brcmf_p2p_pub_af_tx() - public action frame tx routine.
 *
 * @cfg: driver private data for cfg80211 interface.
 * @af_params: action frame data/info.
 * @config_af_params: configuration data for action frame.
 *
 * routine which transmits ation frame public type.
 */
static s32 brcmf_p2p_pub_af_tx(struct brcmf_cfg80211_info *cfg,
                               struct brcmf_fil_af_params_le *af_params,
                               struct brcmf_config_af_params *config_af_params)
{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_fil_action_frame_le *action_frame;
        struct brcmf_p2p_pub_act_frame *act_frm;
        s32 err = 0;
        u16 ie_len;

        action_frame = &af_params->action_frame;
        act_frm = (struct brcmf_p2p_pub_act_frame *)(action_frame->data);

        config_af_params->extra_listen = true;

        switch (act_frm->subtype) {
        case P2P_PAF_GON_REQ:
                brcmf_dbg(TRACE, "P2P: GO_NEG_PHASE status set\n");
                set_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
                config_af_params->mpc_onoff = 0;
                config_af_params->search_channel = true;
                p2p->next_af_subtype = act_frm->subtype + 1;
                p2p->gon_req_action = true;
                /* increase dwell time to wait for RESP frame */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                break;
        case P2P_PAF_GON_RSP:
                p2p->next_af_subtype = act_frm->subtype + 1;
                /* increase dwell time to wait for CONF frame */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                break;
        case P2P_PAF_GON_CONF:
                /* If we reached till GO Neg confirmation reset the filter */
                brcmf_dbg(TRACE, "P2P: GO_NEG_PHASE status cleared\n");
                clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
                /* turn on mpc again if go nego is done */
                config_af_params->mpc_onoff = 1;
                /* minimize dwell time */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MIN_DWELL_TIME);
                config_af_params->extra_listen = false;
                break;
        case P2P_PAF_INVITE_REQ:
                config_af_params->search_channel = true;
                p2p->next_af_subtype = act_frm->subtype + 1;
                /* increase dwell time */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                break;
        case P2P_PAF_INVITE_RSP:
                /* minimize dwell time */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MIN_DWELL_TIME);
                config_af_params->extra_listen = false;
                break;
        case P2P_PAF_DEVDIS_REQ:
                config_af_params->search_channel = true;
                p2p->next_af_subtype = act_frm->subtype + 1;
                /* maximize dwell time to wait for RESP frame */
                af_params->dwell_time = cpu_to_le32(P2P_AF_LONG_DWELL_TIME);
                break;
        case P2P_PAF_DEVDIS_RSP:
                /* minimize dwell time */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MIN_DWELL_TIME);
                config_af_params->extra_listen = false;
                break;
        case P2P_PAF_PROVDIS_REQ:
                ie_len = le16_to_cpu(action_frame->len) -
                         offsetof(struct brcmf_p2p_pub_act_frame, elts);
                if (cfg80211_get_p2p_attr(&act_frm->elts[0], ie_len,
                                          IEEE80211_P2P_ATTR_GROUP_ID,
                                          NULL, 0) < 0)
                        config_af_params->search_channel = true;
                config_af_params->mpc_onoff = 0;
                p2p->next_af_subtype = act_frm->subtype + 1;
                /* increase dwell time to wait for RESP frame */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                break;
        case P2P_PAF_PROVDIS_RSP:
                /* wpa_supplicant send go nego req right after prov disc */
                p2p->next_af_subtype = P2P_PAF_GON_REQ;
                /* increase dwell time to MED level */
                af_params->dwell_time = cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                config_af_params->extra_listen = false;
                break;
        default:
                brcmf_err("Unknown p2p pub act frame subtype: %d\n",
                          act_frm->subtype);
                err = -EINVAL;
        }
        return err;
}

/**
 * brcmf_p2p_send_action_frame() - send action frame .
 *
 * @cfg: driver private data for cfg80211 interface.
 * @ndev: net device to transmit on.
 * @af_params: configuration data for action frame.
 */
bool brcmf_p2p_send_action_frame(struct brcmf_cfg80211_info *cfg,
                                 struct net_device *ndev,
                                 struct brcmf_fil_af_params_le *af_params)
{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct brcmf_fil_action_frame_le *action_frame;
        struct brcmf_config_af_params config_af_params;
        struct afx_hdl *afx_hdl = &p2p->afx_hdl;
        u16 action_frame_len;
        bool ack = false;
        u8 category;
        u8 action;
        s32 tx_retry;
        s32 extra_listen_time;
        uint delta_ms;

        action_frame = &af_params->action_frame;
        action_frame_len = le16_to_cpu(action_frame->len);

        brcmf_p2p_print_actframe(true, action_frame->data, action_frame_len);

        /* Add the default dwell time. Dwell time to stay off-channel */
        /* to wait for a response action frame after transmitting an  */
        /* GO Negotiation action frame                                */
        af_params->dwell_time = cpu_to_le32(P2P_AF_DWELL_TIME);

        category = action_frame->data[DOT11_ACTION_CAT_OFF];
        action = action_frame->data[DOT11_ACTION_ACT_OFF];

        /* initialize variables */
        p2p->next_af_subtype = P2P_PAF_SUBTYPE_INVALID;
        p2p->gon_req_action = false;

        /* config parameters */
        config_af_params.mpc_onoff = -1;
        config_af_params.search_channel = false;
        config_af_params.extra_listen = false;

        if (brcmf_p2p_is_pub_action(action_frame->data, action_frame_len)) {
                /* p2p public action frame process */
                if (brcmf_p2p_pub_af_tx(cfg, af_params, &config_af_params)) {
                        /* Just send unknown subtype frame with */
                        /* default parameters.                  */
                        brcmf_err("P2P Public action frame, unknown subtype.\n");
                }
        } else if (brcmf_p2p_is_gas_action(action_frame->data,
                                           action_frame_len)) {
                /* service discovery process */
                if (action == P2PSD_ACTION_ID_GAS_IREQ ||
                    action == P2PSD_ACTION_ID_GAS_CREQ) {
                        /* configure service discovery query frame */
                        config_af_params.search_channel = true;

                        /* save next af suptype to cancel */
                        /* remaining dwell time           */
                        p2p->next_af_subtype = action + 1;

                        af_params->dwell_time =
                                cpu_to_le32(P2P_AF_MED_DWELL_TIME);
                } else if (action == P2PSD_ACTION_ID_GAS_IRESP ||
                           action == P2PSD_ACTION_ID_GAS_CRESP) {
                        /* configure service discovery response frame */
                        af_params->dwell_time =
                                cpu_to_le32(P2P_AF_MIN_DWELL_TIME);
                } else {
                        brcmf_err("Unknown action type: %d\n", action);
                        goto exit;
                }
        } else if (brcmf_p2p_is_p2p_action(action_frame->data,
                                           action_frame_len)) {
                /* do not configure anything. it will be */
                /* sent with a default configuration     */
        } else {
                brcmf_err("Unknown Frame: category 0x%x, action 0x%x\n",
                          category, action);
                return false;
        }

        /* if connecting on primary iface, sleep for a while before sending
         * af tx for VSDB
         */
        if (test_bit(BRCMF_VIF_STATUS_CONNECTING,
                     &p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif->sme_state))
                msleep(50);

        /* if scan is ongoing, abort current scan. */
        if (test_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status))
                brcmf_abort_scanning(cfg);

        memcpy(afx_hdl->tx_dst_addr, action_frame->da, ETH_ALEN);

        /* To make sure to send successfully action frame, turn off mpc */
        if (config_af_params.mpc_onoff == 0)
                brcmf_set_mpc(ifp, 0);

        /* set status and destination address before sending af */
        if (p2p->next_af_subtype != P2P_PAF_SUBTYPE_INVALID) {
                /* set status to cancel the remained dwell time in rx process */
                set_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME, &p2p->status);
        }

        p2p->af_sent_channel = 0;
        set_bit(BRCMF_P2P_STATUS_SENDING_ACT_FRAME, &p2p->status);
        /* validate channel and p2p ies */
        if (config_af_params.search_channel &&
            IS_P2P_SOCIAL_CHANNEL(le32_to_cpu(af_params->channel)) &&
            p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif->saved_ie.probe_req_ie_len) {
                afx_hdl = &p2p->afx_hdl;
                afx_hdl->peer_listen_chan = le32_to_cpu(af_params->channel);

                if (brcmf_p2p_af_searching_channel(p2p) ==
                                                        P2P_INVALID_CHANNEL) {
                        brcmf_err("Couldn't find peer's channel.\n");
                        goto exit;
                }

                /* Abort scan even for VSDB scenarios. Scan gets aborted in
                 * firmware but after the check of piggyback algorithm. To take
                 * care of current piggback algo, lets abort the scan here
                 * itself.
                 */
                brcmf_notify_escan_complete(cfg, ifp, true, true);

                /* update channel */
                af_params->channel = cpu_to_le32(afx_hdl->peer_chan);
        }

        tx_retry = 0;
        while (!p2p->block_gon_req_tx &&
               (ack == false) && (tx_retry < P2P_AF_TX_MAX_RETRY)) {
                ack = !brcmf_p2p_tx_action_frame(p2p, af_params);
                tx_retry++;
        }
        if (ack == false) {
                brcmf_err("Failed to send Action Frame(retry %d)\n", tx_retry);
                clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
        }

exit:
        clear_bit(BRCMF_P2P_STATUS_SENDING_ACT_FRAME, &p2p->status);

        /* WAR: sometimes dongle does not keep the dwell time of 'actframe'.
         * if we coundn't get the next action response frame and dongle does
         * not keep the dwell time, go to listen state again to get next action
         * response frame.
         */
        if (ack && config_af_params.extra_listen && !p2p->block_gon_req_tx &&
            test_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME, &p2p->status) &&
            p2p->af_sent_channel == afx_hdl->my_listen_chan) {
                delta_ms = jiffies_to_msecs(jiffies - p2p->af_tx_sent_jiffies);
                if (le32_to_cpu(af_params->dwell_time) > delta_ms)
                        extra_listen_time = le32_to_cpu(af_params->dwell_time) -
                                            delta_ms;
                else
                        extra_listen_time = 0;
                if (extra_listen_time > 50) {
                        set_bit(BRCMF_P2P_STATUS_WAITING_NEXT_AF_LISTEN,
                                &p2p->status);
                        brcmf_dbg(INFO, "Wait more time! actual af time:%d, calculated extra listen:%d\n",
                                  le32_to_cpu(af_params->dwell_time),
                                  extra_listen_time);
                        extra_listen_time += 100;
                        if (!brcmf_p2p_discover_listen(p2p,
                                                       p2p->af_sent_channel,
                                                       extra_listen_time)) {
                                unsigned long duration;

                                extra_listen_time += 100;
                                duration = msecs_to_jiffies(extra_listen_time);
                                wait_for_completion_timeout(&p2p->wait_next_af,
                                                            duration);
                        }
                        clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_AF_LISTEN,
                                  &p2p->status);
                }
        }

        if (p2p->block_gon_req_tx) {
                /* if ack is true, supplicant will wait more time(100ms).
                 * so we will return it as a success to get more time .
                 */
                p2p->block_gon_req_tx = false;
                ack = true;
        }

        clear_bit(BRCMF_P2P_STATUS_WAITING_NEXT_ACT_FRAME, &p2p->status);
        /* if all done, turn mpc on again */
        if (config_af_params.mpc_onoff == 1)
                brcmf_set_mpc(ifp, 1);

        return ack;
}

/**
 * brcmf_p2p_notify_rx_mgmt_p2p_probereq() - Event handler for p2p probe req.
 *
 * @ifp: interface pointer for which event was received.
 * @e: even message.
 * @data: payload of event message (probe request).
 */
s32 brcmf_p2p_notify_rx_mgmt_p2p_probereq(struct brcmf_if *ifp,
                                          const struct brcmf_event_msg *e,
                                          void *data)
{
        struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct afx_hdl *afx_hdl = &p2p->afx_hdl;
        struct brcmf_cfg80211_vif *vif = ifp->vif;
        struct brcmf_rx_mgmt_data *rxframe = (struct brcmf_rx_mgmt_data *)data;
        u16 chanspec = be16_to_cpu(rxframe->chanspec);
        struct brcmu_chan ch;
        u8 *mgmt_frame;
        u32 mgmt_frame_len;
        s32 freq;
        u16 mgmt_type;

        brcmf_dbg(INFO, "Enter: event %d reason %d\n", e->event_code,
                  e->reason);

        ch.chspec = be16_to_cpu(rxframe->chanspec);
        cfg->d11inf.decchspec(&ch);

        if (test_bit(BRCMF_P2P_STATUS_FINDING_COMMON_CHANNEL, &p2p->status) &&
            (ether_addr_equal(afx_hdl->tx_dst_addr, e->addr))) {
                afx_hdl->peer_chan = ch.chnum;
                brcmf_dbg(INFO, "PROBE REQUEST: Peer found, channel=%d\n",
                          afx_hdl->peer_chan);
                complete(&afx_hdl->act_frm_scan);
        }

        /* Firmware sends us two proberesponses for each idx one. At the */
        /* moment anything but bsscfgidx 0 is passed up to supplicant    */
        if (e->bsscfgidx == 0)
                return 0;

        /* Filter any P2P probe reqs arriving during the GO-NEG Phase */
        if (test_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status)) {
                brcmf_dbg(INFO, "Filtering P2P probe_req in GO-NEG phase\n");
                return 0;
        }

        /* Check if wpa_supplicant has registered for this frame */
        brcmf_dbg(INFO, "vif->mgmt_rx_reg %04x\n", vif->mgmt_rx_reg);
        mgmt_type = (IEEE80211_STYPE_PROBE_REQ & IEEE80211_FCTL_STYPE) >> 4;
        if ((vif->mgmt_rx_reg & BIT(mgmt_type)) == 0)
                return 0;

        mgmt_frame = (u8 *)(rxframe + 1);
        mgmt_frame_len = e->datalen - sizeof(*rxframe);
        freq = ieee80211_channel_to_frequency(ch.chnum,
                                              ch.band == BRCMU_CHAN_BAND_2G ?
                                              IEEE80211_BAND_2GHZ :
                                              IEEE80211_BAND_5GHZ);

        cfg80211_rx_mgmt(&vif->wdev, freq, 0, mgmt_frame, mgmt_frame_len, 0);

        brcmf_dbg(INFO, "mgmt_frame_len (%d) , e->datalen (%d), chanspec (%04x), freq (%d)\n",
                  mgmt_frame_len, e->datalen, chanspec, freq);

        return 0;
}


/**
 * brcmf_p2p_attach() - attach for P2P.
 *
 * @cfg: driver private data for cfg80211 interface.
 */
s32 brcmf_p2p_attach(struct brcmf_cfg80211_info *cfg)
{
        struct brcmf_if *pri_ifp;
        struct brcmf_if *p2p_ifp;
        struct brcmf_cfg80211_vif *p2p_vif;
        struct brcmf_p2p_info *p2p;
        struct brcmf_pub *drvr;
        s32 bssidx;
        s32 err = 0;

        p2p = &cfg->p2p;
        p2p->cfg = cfg;

        drvr = cfg->pub;

        pri_ifp = drvr->iflist[0];
        p2p_ifp = drvr->iflist[1];

        p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif = pri_ifp->vif;

        if (p2p_ifp) {
                p2p_vif = brcmf_alloc_vif(cfg, NL80211_IFTYPE_P2P_DEVICE,
                                          false);
                if (IS_ERR(p2p_vif)) {
                        brcmf_err("could not create discovery vif\n");
                        err = -ENOMEM;
                        goto exit;
                }

                p2p_vif->ifp = p2p_ifp;
                p2p_ifp->vif = p2p_vif;
                p2p_vif->wdev.netdev = p2p_ifp->ndev;
                p2p_ifp->ndev->ieee80211_ptr = &p2p_vif->wdev;
                SET_NETDEV_DEV(p2p_ifp->ndev, wiphy_dev(cfg->wiphy));

                p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif = p2p_vif;

                brcmf_p2p_generate_bss_mac(p2p, NULL);
                memcpy(p2p_ifp->mac_addr, p2p->dev_addr, ETH_ALEN);
                brcmf_p2p_set_firmware(pri_ifp, p2p->dev_addr);

                /* Initialize P2P Discovery in the firmware */
                err = brcmf_fil_iovar_int_set(pri_ifp, "p2p_disc", 1);
                if (err < 0) {
                        brcmf_err("set p2p_disc error\n");
                        brcmf_free_vif(p2p_vif);
                        goto exit;
                }
                /* obtain bsscfg index for P2P discovery */
                err = brcmf_fil_iovar_int_get(pri_ifp, "p2p_dev", &bssidx);
                if (err < 0) {
                        brcmf_err("retrieving discover bsscfg index failed\n");
                        brcmf_free_vif(p2p_vif);
                        goto exit;
                }
                /* Verify that firmware uses same bssidx as driver !! */
                if (p2p_ifp->bssidx != bssidx) {
                        brcmf_err("Incorrect bssidx=%d, compared to p2p_ifp->bssidx=%d\n",
                                  bssidx, p2p_ifp->bssidx);
                        brcmf_free_vif(p2p_vif);
                        goto exit;
                }

                init_completion(&p2p->send_af_done);
                INIT_WORK(&p2p->afx_hdl.afx_work, brcmf_p2p_afx_handler);
                init_completion(&p2p->afx_hdl.act_frm_scan);
                init_completion(&p2p->wait_next_af);
        }
exit:
        return err;
}


/**
 * brcmf_p2p_detach() - detach P2P.
 *
 * @p2p: P2P specific data.
 */
void brcmf_p2p_detach(struct brcmf_p2p_info *p2p)
{
        struct brcmf_cfg80211_vif *vif;

        vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
        if (vif != NULL) {
                brcmf_p2p_cancel_remain_on_channel(vif->ifp);
                brcmf_p2p_deinit_discovery(p2p);
                /* remove discovery interface */
                brcmf_free_vif(vif);
                p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif = NULL;
        }
        /* just set it all to zero */
        memset(p2p, 0, sizeof(*p2p));
}

/**
 * brcmf_p2p_get_current_chanspec() - Get current operation channel.
 *
 * @p2p: P2P specific data.
 * @chanspec: chanspec to be returned.
 */
static void brcmf_p2p_get_current_chanspec(struct brcmf_p2p_info *p2p,
                                           u16 *chanspec)
{
        struct brcmf_if *ifp;
        u8 mac_addr[ETH_ALEN];
        struct brcmu_chan ch;
        struct brcmf_bss_info_le *bi;
        u8 *buf;

        ifp = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif->ifp;

        if (brcmf_fil_cmd_data_get(ifp, BRCMF_C_GET_BSSID, mac_addr,
                                   ETH_ALEN) == 0) {
                buf = kzalloc(WL_BSS_INFO_MAX, GFP_KERNEL);
                if (buf != NULL) {
                        *(__le32 *)buf = cpu_to_le32(WL_BSS_INFO_MAX);
                        if (brcmf_fil_cmd_data_get(ifp, BRCMF_C_GET_BSS_INFO,
                                                   buf, WL_BSS_INFO_MAX) == 0) {
                                bi = (struct brcmf_bss_info_le *)(buf + 4);
                                *chanspec = le16_to_cpu(bi->chanspec);
                                kfree(buf);
                                return;
                        }
                        kfree(buf);
                }
        }
        /* Use default channel for P2P */
        ch.chnum = BRCMF_P2P_TEMP_CHAN;
        ch.bw = BRCMU_CHAN_BW_20;
        p2p->cfg->d11inf.encchspec(&ch);
        *chanspec = ch.chspec;
}

/**
 * Change a P2P Role.
 * Parameters:
 * @mac: MAC address of the BSS to change a role
 * Returns 0 if success.
 */
int brcmf_p2p_ifchange(struct brcmf_cfg80211_info *cfg,
                       enum brcmf_fil_p2p_if_types if_type)
{
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_cfg80211_vif *vif;
        struct brcmf_fil_p2p_if_le if_request;
        s32 err;
        u16 chanspec;

        brcmf_dbg(TRACE, "Enter\n");

        vif = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif;
        if (!vif) {
                brcmf_err("vif for P2PAPI_BSSCFG_PRIMARY does not exist\n");
                return -EPERM;
        }
        brcmf_notify_escan_complete(cfg, vif->ifp, true, true);
        vif = p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif;
        if (!vif) {
                brcmf_err("vif for P2PAPI_BSSCFG_CONNECTION does not exist\n");
                return -EPERM;
        }
        brcmf_set_mpc(vif->ifp, 0);

        /* In concurrency case, STA may be already associated in a particular */
        /* channel. so retrieve the current channel of primary interface and  */
        /* then start the virtual interface on that.                          */
        brcmf_p2p_get_current_chanspec(p2p, &chanspec);

        if_request.type = cpu_to_le16((u16)if_type);
        if_request.chspec = cpu_to_le16(chanspec);
        memcpy(if_request.addr, p2p->int_addr, sizeof(if_request.addr));

        brcmf_cfg80211_arm_vif_event(cfg, vif);
        err = brcmf_fil_iovar_data_set(vif->ifp, "p2p_ifupd", &if_request,
                                       sizeof(if_request));
        if (err) {
                brcmf_err("p2p_ifupd FAILED, err=%d\n", err);
                brcmf_cfg80211_arm_vif_event(cfg, NULL);
                return err;
        }
        err = brcmf_cfg80211_wait_vif_event_timeout(cfg, BRCMF_E_IF_CHANGE,
                                                    msecs_to_jiffies(1500));
        brcmf_cfg80211_arm_vif_event(cfg, NULL);
        if (!err)  {
                brcmf_err("No BRCMF_E_IF_CHANGE event received\n");
                return -EIO;
        }

        err = brcmf_fil_cmd_int_set(vif->ifp, BRCMF_C_SET_SCB_TIMEOUT,
                                    BRCMF_SCB_TIMEOUT_VALUE);

        return err;
}

static int brcmf_p2p_request_p2p_if(struct brcmf_p2p_info *p2p,
                                    struct brcmf_if *ifp, u8 ea[ETH_ALEN],
                                    enum brcmf_fil_p2p_if_types iftype)
{
        struct brcmf_fil_p2p_if_le if_request;
        int err;
        u16 chanspec;

        /* we need a default channel */
        brcmf_p2p_get_current_chanspec(p2p, &chanspec);

        /* fill the firmware request */
        memcpy(if_request.addr, ea, ETH_ALEN);
        if_request.type = cpu_to_le16((u16)iftype);
        if_request.chspec = cpu_to_le16(chanspec);

        err = brcmf_fil_iovar_data_set(ifp, "p2p_ifadd", &if_request,
                                       sizeof(if_request));
        if (err)
                return err;

        return err;
}

static int brcmf_p2p_disable_p2p_if(struct brcmf_cfg80211_vif *vif)
{
        struct brcmf_cfg80211_info *cfg = wdev_to_cfg(&vif->wdev);
        struct net_device *pri_ndev = cfg_to_ndev(cfg);
        struct brcmf_if *ifp = netdev_priv(pri_ndev);
        u8 *addr = vif->wdev.netdev->dev_addr;

        return brcmf_fil_iovar_data_set(ifp, "p2p_ifdis", addr, ETH_ALEN);
}

static int brcmf_p2p_release_p2p_if(struct brcmf_cfg80211_vif *vif)
{
        struct brcmf_cfg80211_info *cfg = wdev_to_cfg(&vif->wdev);
        struct net_device *pri_ndev = cfg_to_ndev(cfg);
        struct brcmf_if *ifp = netdev_priv(pri_ndev);
        u8 *addr = vif->wdev.netdev->dev_addr;

        return brcmf_fil_iovar_data_set(ifp, "p2p_ifdel", addr, ETH_ALEN);
}

/**
 * brcmf_p2p_create_p2pdev() - create a P2P_DEVICE virtual interface.
 *
 * @p2p: P2P specific data.
 * @wiphy: wiphy device of new interface.
 * @addr: mac address for this new interface.
 */
static struct wireless_dev *brcmf_p2p_create_p2pdev(struct brcmf_p2p_info *p2p,
                                                    struct wiphy *wiphy,
                                                    u8 *addr)
{
        struct brcmf_cfg80211_vif *p2p_vif;
        struct brcmf_if *p2p_ifp;
        struct brcmf_if *pri_ifp;
        int err;
        u32 bssidx;

        if (p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif)
                return ERR_PTR(-ENOSPC);

        p2p_vif = brcmf_alloc_vif(p2p->cfg, NL80211_IFTYPE_P2P_DEVICE,
                                  false);
        if (IS_ERR(p2p_vif)) {
                brcmf_err("could not create discovery vif\n");
                return (struct wireless_dev *)p2p_vif;
        }

        pri_ifp = p2p->bss_idx[P2PAPI_BSSCFG_PRIMARY].vif->ifp;
        brcmf_p2p_generate_bss_mac(p2p, addr);
        brcmf_p2p_set_firmware(pri_ifp, p2p->dev_addr);

        brcmf_cfg80211_arm_vif_event(p2p->cfg, p2p_vif);

        /* Initialize P2P Discovery in the firmware */
        err = brcmf_fil_iovar_int_set(pri_ifp, "p2p_disc", 1);
        if (err < 0) {
                brcmf_err("set p2p_disc error\n");
                brcmf_cfg80211_arm_vif_event(p2p->cfg, NULL);
                goto fail;
        }

        /* wait for firmware event */
        err = brcmf_cfg80211_wait_vif_event_timeout(p2p->cfg, BRCMF_E_IF_ADD,
                                                    msecs_to_jiffies(1500));
        brcmf_cfg80211_arm_vif_event(p2p->cfg, NULL);
        if (!err) {
                brcmf_err("timeout occurred\n");
                err = -EIO;
                goto fail;
        }

        /* discovery interface created */
        p2p_ifp = p2p_vif->ifp;
        p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif = p2p_vif;
        memcpy(p2p_ifp->mac_addr, p2p->dev_addr, ETH_ALEN);
        memcpy(&p2p_vif->wdev.address, p2p->dev_addr, sizeof(p2p->dev_addr));

        /* verify bsscfg index for P2P discovery */
        err = brcmf_fil_iovar_int_get(pri_ifp, "p2p_dev", &bssidx);
        if (err < 0) {
                brcmf_err("retrieving discover bsscfg index failed\n");
                goto fail;
        }

        WARN_ON(p2p_ifp->bssidx != bssidx);

        init_completion(&p2p->send_af_done);
        INIT_WORK(&p2p->afx_hdl.afx_work, brcmf_p2p_afx_handler);
        init_completion(&p2p->afx_hdl.act_frm_scan);
        init_completion(&p2p->wait_next_af);

        return &p2p_vif->wdev;

fail:
        brcmf_free_vif(p2p_vif);
        return ERR_PTR(err);
}

/**
 * brcmf_p2p_delete_p2pdev() - delete P2P_DEVICE virtual interface.
 *
 * @vif: virtual interface object to delete.
 */
static void brcmf_p2p_delete_p2pdev(struct brcmf_p2p_info *p2p,
                                    struct brcmf_cfg80211_vif *vif)
{
        cfg80211_unregister_wdev(&vif->wdev);
        p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif = NULL;
        brcmf_free_vif(vif);
}

/**
 * brcmf_p2p_add_vif() - create a new P2P virtual interface.
 *
 * @wiphy: wiphy device of new interface.
 * @name: name of the new interface.
 * @name_assign_type: origin of the interface name
 * @type: nl80211 interface type.
 * @flags: not used.
 * @params: contains mac address for P2P device.
 */
struct wireless_dev *brcmf_p2p_add_vif(struct wiphy *wiphy, const char *name,
                                       unsigned char name_assign_type,
                                       enum nl80211_iftype type, u32 *flags,
                                       struct vif_params *params)
{
        struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
        struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
        struct brcmf_cfg80211_vif *vif;
        enum brcmf_fil_p2p_if_types iftype;
        int err;

        if (brcmf_cfg80211_vif_event_armed(cfg))
                return ERR_PTR(-EBUSY);

        brcmf_dbg(INFO, "adding vif \"%s\" (type=%d)\n", name, type);

        switch (type) {
        case NL80211_IFTYPE_P2P_CLIENT:
                iftype = BRCMF_FIL_P2P_IF_CLIENT;
                break;
        case NL80211_IFTYPE_P2P_GO:
                iftype = BRCMF_FIL_P2P_IF_GO;
                break;
        case NL80211_IFTYPE_P2P_DEVICE:
                return brcmf_p2p_create_p2pdev(&cfg->p2p, wiphy,
                                               params->macaddr);
        default:
                return ERR_PTR(-EOPNOTSUPP);
        }

        vif = brcmf_alloc_vif(cfg, type, false);
        if (IS_ERR(vif))
                return (struct wireless_dev *)vif;
        brcmf_cfg80211_arm_vif_event(cfg, vif);

        err = brcmf_p2p_request_p2p_if(&cfg->p2p, ifp, cfg->p2p.int_addr,
                                       iftype);
        if (err) {
                brcmf_cfg80211_arm_vif_event(cfg, NULL);
                goto fail;
        }

        /* wait for firmware event */
        err = brcmf_cfg80211_wait_vif_event_timeout(cfg, BRCMF_E_IF_ADD,
                                                    msecs_to_jiffies(1500));
        brcmf_cfg80211_arm_vif_event(cfg, NULL);
        if (!err) {
                brcmf_err("timeout occurred\n");
                err = -EIO;
                goto fail;
        }

        /* interface created in firmware */
        ifp = vif->ifp;
        if (!ifp) {
                brcmf_err("no if pointer provided\n");
                err = -ENOENT;
                goto fail;
        }

        strncpy(ifp->ndev->name, name, sizeof(ifp->ndev->name) - 1);
        ifp->ndev->name_assign_type = name_assign_type;
        err = brcmf_net_attach(ifp, true);
        if (err) {
                brcmf_err("Registering netdevice failed\n");
                goto fail;
        }

        cfg->p2p.bss_idx[P2PAPI_BSSCFG_CONNECTION].vif = vif;
        /* Disable firmware roaming for P2P interface  */
        brcmf_fil_iovar_int_set(ifp, "roam_off", 1);
        if (iftype == BRCMF_FIL_P2P_IF_GO) {
                /* set station timeout for p2p */
                brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_SCB_TIMEOUT,
                                      BRCMF_SCB_TIMEOUT_VALUE);
        }
        return &ifp->vif->wdev;

fail:
        brcmf_free_vif(vif);
        return ERR_PTR(err);
}

/**
 * brcmf_p2p_del_vif() - delete a P2P virtual interface.
 *
 * @wiphy: wiphy device of interface.
 * @wdev: wireless device of interface.
 */
int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
{
        struct brcmf_cfg80211_info *cfg = wiphy_priv(wiphy);
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_cfg80211_vif *vif;
        unsigned long jiffie_timeout = msecs_to_jiffies(1500);
        bool wait_for_disable = false;
        int err;

        brcmf_dbg(TRACE, "delete P2P vif\n");
        vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);

        switch (vif->wdev.iftype) {
        case NL80211_IFTYPE_P2P_CLIENT:
                if (test_bit(BRCMF_VIF_STATUS_DISCONNECTING, &vif->sme_state))
                        wait_for_disable = true;
                break;

        case NL80211_IFTYPE_P2P_GO:
                if (!brcmf_p2p_disable_p2p_if(vif))
                        wait_for_disable = true;
                break;

        case NL80211_IFTYPE_P2P_DEVICE:
                brcmf_p2p_delete_p2pdev(p2p, vif);
                return 0;
        default:
                return -ENOTSUPP;
        }

        clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
        brcmf_dbg(INFO, "P2P: GO_NEG_PHASE status cleared\n");

        if (wait_for_disable)
                wait_for_completion_timeout(&cfg->vif_disabled,
                                            msecs_to_jiffies(500));

        brcmf_vif_clear_mgmt_ies(vif);

        brcmf_cfg80211_arm_vif_event(cfg, vif);
        err = brcmf_p2p_release_p2p_if(vif);
        if (!err) {
                /* wait for firmware event */
                err = brcmf_cfg80211_wait_vif_event_timeout(cfg, BRCMF_E_IF_DEL,
                                                            jiffie_timeout);
                if (!err)
                        err = -EIO;
                else
                        err = 0;
        }
        brcmf_cfg80211_arm_vif_event(cfg, NULL);
        p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif = NULL;

        return err;
}

int brcmf_p2p_start_device(struct wiphy *wiphy, struct wireless_dev *wdev)
{
        struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_cfg80211_vif *vif;
        int err;

        vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
        mutex_lock(&cfg->usr_sync);
        err = brcmf_p2p_enable_discovery(p2p);
        if (!err)
                set_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state);
        mutex_unlock(&cfg->usr_sync);
        return err;
}

void brcmf_p2p_stop_device(struct wiphy *wiphy, struct wireless_dev *wdev)
{
        struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
        struct brcmf_p2p_info *p2p = &cfg->p2p;
        struct brcmf_cfg80211_vif *vif;

        vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
        mutex_lock(&cfg->usr_sync);
        (void)brcmf_p2p_deinit_discovery(p2p);
        brcmf_abort_scanning(cfg);
        clear_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state);
        mutex_unlock(&cfg->usr_sync);
}