/*
 * Copyright (c) 2012-2016 Qualcomm Atheros, Inc.
 *
 * 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/moduleparam.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>

#include "wil6210.h"
#include "txrx.h"
#include "wmi.h"
#include "trace.h"

static uint max_assoc_sta = WIL6210_MAX_CID;
module_param(max_assoc_sta, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(max_assoc_sta, " Max number of stations associated to the AP");

int agg_wsize; /* = 0; */
module_param(agg_wsize, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(agg_wsize, " Window size for Tx Block Ack after connect;"
                 " 0 - use default; < 0 - don't auto-establish");

/**
 * WMI event receiving - theory of operations
 *
 * When firmware about to report WMI event, it fills memory area
 * in the mailbox and raises misc. IRQ. Thread interrupt handler invoked for
 * the misc IRQ, function @wmi_recv_cmd called by thread IRQ handler.
 *
 * @wmi_recv_cmd reads event, allocates memory chunk  and attaches it to the
 * event list @wil->pending_wmi_ev. Then, work queue @wil->wmi_wq wakes up
 * and handles events within the @wmi_event_worker. Every event get detached
 * from list, processed and deleted.
 *
 * Purpose for this mechanism is to release IRQ thread; otherwise,
 * if WMI event handling involves another WMI command flow, this 2-nd flow
 * won't be completed because of blocked IRQ thread.
 */

/**
 * Addressing - theory of operations
 *
 * There are several buses present on the WIL6210 card.
 * Same memory areas are visible at different address on
 * the different busses. There are 3 main bus masters:
 *  - MAC CPU (ucode)
 *  - User CPU (firmware)
 *  - AHB (host)
 *
 * On the PCI bus, there is one BAR (BAR0) of 2Mb size, exposing
 * AHB addresses starting from 0x880000
 *
 * Internally, firmware uses addresses that allows faster access but
 * are invisible from the host. To read from these addresses, alternative
 * AHB address must be used.
 *
 * Memory mapping
 * Linker address         PCI/Host address
 *                        0x880000 .. 0xa80000  2Mb BAR0
 * 0x800000 .. 0x807000   0x900000 .. 0x907000  28k DCCM
 * 0x840000 .. 0x857000   0x908000 .. 0x91f000  92k PERIPH
 */

/**
 * @fw_mapping provides memory remapping table
 *
 * array size should be in sync with the declaration in the wil6210.h
 */
const struct fw_map fw_mapping[] = {
        {0x000000, 0x040000, 0x8c0000, "fw_code"}, /* FW code RAM      256k */
        {0x800000, 0x808000, 0x900000, "fw_data"}, /* FW data RAM       32k */
        {0x840000, 0x860000, 0x908000, "fw_peri"}, /* periph. data RAM 128k */
        {0x880000, 0x88a000, 0x880000, "rgf"},     /* various RGF       40k */
        {0x88a000, 0x88b000, 0x88a000, "AGC_tbl"}, /* AGC table          4k */
        {0x88b000, 0x88c000, 0x88b000, "rgf_ext"}, /* Pcie_ext_rgf       4k */
        {0x88c000, 0x88c200, 0x88c000, "mac_rgf_ext"}, /* mac_ext_rgf  512b */
        {0x8c0000, 0x949000, 0x8c0000, "upper"},   /* upper area       548k */
        /*
         * 920000..930000 ucode code RAM
         * 930000..932000 ucode data RAM
         * 932000..949000 back-door debug data
         */
};

/**
 * return AHB address for given firmware/ucode internal (linker) address
 * @x - internal address
 * If address have no valid AHB mapping, return 0
 */
static u32 wmi_addr_remap(u32 x)
{
        uint i;

        for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) {
                if ((x >= fw_mapping[i].from) && (x < fw_mapping[i].to))
                        return x + fw_mapping[i].host - fw_mapping[i].from;
        }

        return 0;
}

/**
 * Check address validity for WMI buffer; remap if needed
 * @ptr - internal (linker) fw/ucode address
 *
 * Valid buffer should be DWORD aligned
 *
 * return address for accessing buffer from the host;
 * if buffer is not valid, return NULL.
 */
void __iomem *wmi_buffer(struct wil6210_priv *wil, __le32 ptr_)
{
        u32 off;
        u32 ptr = le32_to_cpu(ptr_);

        if (ptr % 4)
                return NULL;

        ptr = wmi_addr_remap(ptr);
        if (ptr < WIL6210_FW_HOST_OFF)
                return NULL;

        off = HOSTADDR(ptr);
        if (off > WIL6210_MEM_SIZE - 4)
                return NULL;

        return wil->csr + off;
}

/**
 * Check address validity
 */
void __iomem *wmi_addr(struct wil6210_priv *wil, u32 ptr)
{
        u32 off;

        if (ptr % 4)
                return NULL;

        if (ptr < WIL6210_FW_HOST_OFF)
                return NULL;

        off = HOSTADDR(ptr);
        if (off > WIL6210_MEM_SIZE - 4)
                return NULL;

        return wil->csr + off;
}

int wmi_read_hdr(struct wil6210_priv *wil, __le32 ptr,
                 struct wil6210_mbox_hdr *hdr)
{
        void __iomem *src = wmi_buffer(wil, ptr);

        if (!src)
                return -EINVAL;

        wil_memcpy_fromio_32(hdr, src, sizeof(*hdr));

        return 0;
}

static int __wmi_send(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len)
{
        struct {
                struct wil6210_mbox_hdr hdr;
                struct wil6210_mbox_hdr_wmi wmi;
        } __packed cmd = {
                .hdr = {
                        .type = WIL_MBOX_HDR_TYPE_WMI,
                        .flags = 0,
                        .len = cpu_to_le16(sizeof(cmd.wmi) + len),
                },
                .wmi = {
                        .mid = 0,
                        .id = cpu_to_le16(cmdid),
                },
        };
        struct wil6210_mbox_ring *r = &wil->mbox_ctl.tx;
        struct wil6210_mbox_ring_desc d_head;
        u32 next_head;
        void __iomem *dst;
        void __iomem *head = wmi_addr(wil, r->head);
        uint retry;

        if (sizeof(cmd) + len > r->entry_size) {
                wil_err(wil, "WMI size too large: %d bytes, max is %d\n",
                        (int)(sizeof(cmd) + len), r->entry_size);
                return -ERANGE;
        }

        might_sleep();

        if (!test_bit(wil_status_fwready, wil->status)) {
                wil_err(wil, "WMI: cannot send command while FW not ready\n");
                return -EAGAIN;
        }

        if (!head) {
                wil_err(wil, "WMI head is garbage: 0x%08x\n", r->head);
                return -EINVAL;
        }
        /* read Tx head till it is not busy */
        for (retry = 5; retry > 0; retry--) {
                wil_memcpy_fromio_32(&d_head, head, sizeof(d_head));
                if (d_head.sync == 0)
                        break;
                msleep(20);
        }
        if (d_head.sync != 0) {
                wil_err(wil, "WMI head busy\n");
                return -EBUSY;
        }
        /* next head */
        next_head = r->base + ((r->head - r->base + sizeof(d_head)) % r->size);
        wil_dbg_wmi(wil, "Head 0x%08x -> 0x%08x\n", r->head, next_head);
        /* wait till FW finish with previous command */
        for (retry = 5; retry > 0; retry--) {
                if (!test_bit(wil_status_fwready, wil->status)) {
                        wil_err(wil, "WMI: cannot send command while FW not ready\n");
                        return -EAGAIN;
                }
                r->tail = wil_r(wil, RGF_MBOX +
                                offsetof(struct wil6210_mbox_ctl, tx.tail));
                if (next_head != r->tail)
                        break;
                msleep(20);
        }
        if (next_head == r->tail) {
                wil_err(wil, "WMI ring full\n");
                return -EBUSY;
        }
        dst = wmi_buffer(wil, d_head.addr);
        if (!dst) {
                wil_err(wil, "invalid WMI buffer: 0x%08x\n",
                        le32_to_cpu(d_head.addr));
                return -EINVAL;
        }
        cmd.hdr.seq = cpu_to_le16(++wil->wmi_seq);
        /* set command */
        wil_dbg_wmi(wil, "WMI command 0x%04x [%d]\n", cmdid, len);
        wil_hex_dump_wmi("Cmd ", DUMP_PREFIX_OFFSET, 16, 1, &cmd,
                         sizeof(cmd), true);
        wil_hex_dump_wmi("cmd ", DUMP_PREFIX_OFFSET, 16, 1, buf,
                         len, true);
        wil_memcpy_toio_32(dst, &cmd, sizeof(cmd));
        wil_memcpy_toio_32(dst + sizeof(cmd), buf, len);
        /* mark entry as full */
        wil_w(wil, r->head + offsetof(struct wil6210_mbox_ring_desc, sync), 1);
        /* advance next ptr */
        wil_w(wil, RGF_MBOX + offsetof(struct wil6210_mbox_ctl, tx.head),
              r->head = next_head);

        trace_wil6210_wmi_cmd(&cmd.wmi, buf, len);

        /* interrupt to FW */
        wil_w(wil, RGF_USER_USER_ICR + offsetof(struct RGF_ICR, ICS),
              SW_INT_MBOX);

        return 0;
}

int wmi_send(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len)
{
        int rc;

        mutex_lock(&wil->wmi_mutex);
        rc = __wmi_send(wil, cmdid, buf, len);
        mutex_unlock(&wil->wmi_mutex);

        return rc;
}

/*=== Event handlers ===*/
static void wmi_evt_ready(struct wil6210_priv *wil, int id, void *d, int len)
{
        struct wireless_dev *wdev = wil->wdev;
        struct wmi_ready_event *evt = d;

        wil->fw_version = le32_to_cpu(evt->sw_version);
        wil->n_mids = evt->numof_additional_mids;

        wil_info(wil, "FW ver. %d; MAC %pM; %d MID's\n", wil->fw_version,
                 evt->mac, wil->n_mids);
        /* ignore MAC address, we already have it from the boot loader */
        snprintf(wdev->wiphy->fw_version, sizeof(wdev->wiphy->fw_version),
                 "%d", wil->fw_version);

        wil_set_recovery_state(wil, fw_recovery_idle);
        set_bit(wil_status_fwready, wil->status);
        /* let the reset sequence continue */
        complete(&wil->wmi_ready);
}

static void wmi_evt_rx_mgmt(struct wil6210_priv *wil, int id, void *d, int len)
{
        struct wmi_rx_mgmt_packet_event *data = d;
        struct wiphy *wiphy = wil_to_wiphy(wil);
        struct ieee80211_mgmt *rx_mgmt_frame =
                        (struct ieee80211_mgmt *)data->payload;
        int flen = len - offsetof(struct wmi_rx_mgmt_packet_event, payload);
        int ch_no;
        u32 freq;
        struct ieee80211_channel *channel;
        s32 signal;
        __le16 fc;
        u32 d_len;
        u16 d_status;

        if (flen < 0) {
                wil_err(wil, "MGMT Rx: short event, len %d\n", len);
                return;
        }

        d_len = le32_to_cpu(data->info.len);
        if (d_len != flen) {
                wil_err(wil,
                        "MGMT Rx: length mismatch, d_len %d should be %d\n",
                        d_len, flen);
                return;
        }

        ch_no = data->info.channel + 1;
        freq = ieee80211_channel_to_frequency(ch_no, IEEE80211_BAND_60GHZ);
        channel = ieee80211_get_channel(wiphy, freq);
        signal = data->info.sqi;
        d_status = le16_to_cpu(data->info.status);
        fc = rx_mgmt_frame->frame_control;

        wil_dbg_wmi(wil, "MGMT Rx: channel %d MCS %d SNR %d SQI %d%%\n",
                    data->info.channel, data->info.mcs, data->info.snr,
                    data->info.sqi);
        wil_dbg_wmi(wil, "status 0x%04x len %d fc 0x%04x\n", d_status, d_len,
                    le16_to_cpu(fc));
        wil_dbg_wmi(wil, "qid %d mid %d cid %d\n",
                    data->info.qid, data->info.mid, data->info.cid);
        wil_hex_dump_wmi("MGMT Rx ", DUMP_PREFIX_OFFSET, 16, 1, rx_mgmt_frame,
                         d_len, true);

        if (!channel) {
                wil_err(wil, "Frame on unsupported channel\n");
                return;
        }

        if (ieee80211_is_beacon(fc) || ieee80211_is_probe_resp(fc)) {
                struct cfg80211_bss *bss;
                u64 tsf = le64_to_cpu(rx_mgmt_frame->u.beacon.timestamp);
                u16 cap = le16_to_cpu(rx_mgmt_frame->u.beacon.capab_info);
                u16 bi = le16_to_cpu(rx_mgmt_frame->u.beacon.beacon_int);
                const u8 *ie_buf = rx_mgmt_frame->u.beacon.variable;
                size_t ie_len = d_len - offsetof(struct ieee80211_mgmt,
                                                 u.beacon.variable);
                wil_dbg_wmi(wil, "Capability info : 0x%04x\n", cap);
                wil_dbg_wmi(wil, "TSF : 0x%016llx\n", tsf);
                wil_dbg_wmi(wil, "Beacon interval : %d\n", bi);
                wil_hex_dump_wmi("IE ", DUMP_PREFIX_OFFSET, 16, 1, ie_buf,
                                 ie_len, true);

                bss = cfg80211_inform_bss_frame(wiphy, channel, rx_mgmt_frame,
                                                d_len, signal, GFP_KERNEL);
                if (bss) {
                        wil_dbg_wmi(wil, "Added BSS %pM\n",
                                    rx_mgmt_frame->bssid);
                        cfg80211_put_bss(wiphy, bss);
                } else {
                        wil_err(wil, "cfg80211_inform_bss_frame() failed\n");
                }
        } else {
                cfg80211_rx_mgmt(wil->wdev, freq, signal,
                                 (void *)rx_mgmt_frame, d_len, 0);
        }
}

static void wmi_evt_tx_mgmt(struct wil6210_priv *wil, int id, void *d, int len)
{
        struct wmi_tx_mgmt_packet_event *data = d;
        struct ieee80211_mgmt *mgmt_frame =
                        (struct ieee80211_mgmt *)data->payload;
        int flen = len - offsetof(struct wmi_tx_mgmt_packet_event, payload);

        wil_hex_dump_wmi("MGMT Tx ", DUMP_PREFIX_OFFSET, 16, 1, mgmt_frame,
                         flen, true);
}

static void wmi_evt_scan_complete(struct wil6210_priv *wil, int id,
                                  void *d, int len)
{
        if (wil->scan_request) {
                struct wmi_scan_complete_event *data = d;
                bool aborted = (data->status != WMI_SCAN_SUCCESS);

                wil_dbg_wmi(wil, "SCAN_COMPLETE(0x%08x)\n", data->status);
                wil_dbg_misc(wil, "Complete scan_request 0x%p aborted %d\n",
                             wil->scan_request, aborted);

                del_timer_sync(&wil->scan_timer);
                cfg80211_scan_done(wil->scan_request, aborted);
                wil->scan_request = NULL;
        } else {
                wil_err(wil, "SCAN_COMPLETE while not scanning\n");
        }
}

static void wmi_evt_connect(struct wil6210_priv *wil, int id, void *d, int len)
{
        struct net_device *ndev = wil_to_ndev(wil);
        struct wireless_dev *wdev = wil->wdev;
        struct wmi_connect_event *evt = d;
        int ch; /* channel number */
        struct station_info sinfo;
        u8 *assoc_req_ie, *assoc_resp_ie;
        size_t assoc_req_ielen, assoc_resp_ielen;
        /* capinfo(u16) + listen_interval(u16) + IEs */
        const size_t assoc_req_ie_offset = sizeof(u16) * 2;
        /* capinfo(u16) + status_code(u16) + associd(u16) + IEs */
        const size_t assoc_resp_ie_offset = sizeof(u16) * 3;
        int rc;

        if (len < sizeof(*evt)) {
                wil_err(wil, "Connect event too short : %d bytes\n", len);
                return;
        }
        if (len != sizeof(*evt) + evt->beacon_ie_len + evt->assoc_req_len +
                   evt->assoc_resp_len) {
                wil_err(wil,
                        "Connect event corrupted : %d != %d + %d + %d + %d\n",
                        len, (int)sizeof(*evt), evt->beacon_ie_len,
                        evt->assoc_req_len, evt->assoc_resp_len);
                return;
        }
        if (evt->cid >= WIL6210_MAX_CID) {
                wil_err(wil, "Connect CID invalid : %d\n", evt->cid);
                return;
        }

        ch = evt->channel + 1;
        wil_info(wil, "Connect %pM channel [%d] cid %d\n",
                 evt->bssid, ch, evt->cid);
        wil_hex_dump_wmi("connect AI : ", DUMP_PREFIX_OFFSET, 16, 1,
                         evt->assoc_info, len - sizeof(*evt), true);

        /* figure out IE's */
        assoc_req_ie = &evt->assoc_info[evt->beacon_ie_len +
                                        assoc_req_ie_offset];
        assoc_req_ielen = evt->assoc_req_len - assoc_req_ie_offset;
        if (evt->assoc_req_len <= assoc_req_ie_offset) {
                assoc_req_ie = NULL;
                assoc_req_ielen = 0;
        }

        assoc_resp_ie = &evt->assoc_info[evt->beacon_ie_len +
                                         evt->assoc_req_len +
                                         assoc_resp_ie_offset];
        assoc_resp_ielen = evt->assoc_resp_len - assoc_resp_ie_offset;
        if (evt->assoc_resp_len <= assoc_resp_ie_offset) {
                assoc_resp_ie = NULL;
                assoc_resp_ielen = 0;
        }

        mutex_lock(&wil->mutex);
        if (test_bit(wil_status_resetting, wil->status) ||
            !test_bit(wil_status_fwready, wil->status)) {
                wil_err(wil, "status_resetting, cancel connect event, CID %d\n",
                        evt->cid);
                mutex_unlock(&wil->mutex);
                /* no need for cleanup, wil_reset will do that */
                return;
        }

        if ((wdev->iftype == NL80211_IFTYPE_STATION) ||
            (wdev->iftype == NL80211_IFTYPE_P2P_CLIENT)) {
                if (!test_bit(wil_status_fwconnecting, wil->status)) {
                        wil_err(wil, "Not in connecting state\n");
                        mutex_unlock(&wil->mutex);
                        return;
                }
                del_timer_sync(&wil->connect_timer);
        }

        /* FIXME FW can transmit only ucast frames to peer */
        /* FIXME real ring_id instead of hard coded 0 */
        ether_addr_copy(wil->sta[evt->cid].addr, evt->bssid);
        wil->sta[evt->cid].status = wil_sta_conn_pending;

        rc = wil_tx_init(wil, evt->cid);
        if (rc) {
                wil_err(wil, "%s: config tx vring failed for CID %d, rc (%d)\n",
                        __func__, evt->cid, rc);
                wmi_disconnect_sta(wil, wil->sta[evt->cid].addr,
                                   WLAN_REASON_UNSPECIFIED, false);
        } else {
                wil_info(wil, "%s: successful connection to CID %d\n",
                         __func__, evt->cid);
        }

        if ((wdev->iftype == NL80211_IFTYPE_STATION) ||
            (wdev->iftype == NL80211_IFTYPE_P2P_CLIENT)) {
                if (rc) {
                        netif_tx_stop_all_queues(ndev);
                        netif_carrier_off(ndev);
                        wil_err(wil,
                                "%s: cfg80211_connect_result with failure\n",
                                __func__);
                        cfg80211_connect_result(ndev, evt->bssid, NULL, 0,
                                                NULL, 0,
                                                WLAN_STATUS_UNSPECIFIED_FAILURE,
                                                GFP_KERNEL);
                        goto out;
                } else {
                        cfg80211_connect_result(ndev, evt->bssid,
                                                assoc_req_ie, assoc_req_ielen,
                                                assoc_resp_ie, assoc_resp_ielen,
                                                WLAN_STATUS_SUCCESS,
                                                GFP_KERNEL);
                }
        } else if ((wdev->iftype == NL80211_IFTYPE_AP) ||
                   (wdev->iftype == NL80211_IFTYPE_P2P_GO)) {
                if (rc)
                        goto out;

                memset(&sinfo, 0, sizeof(sinfo));

                sinfo.generation = wil->sinfo_gen++;

                if (assoc_req_ie) {
                        sinfo.assoc_req_ies = assoc_req_ie;
                        sinfo.assoc_req_ies_len = assoc_req_ielen;
                }

                cfg80211_new_sta(ndev, evt->bssid, &sinfo, GFP_KERNEL);
        } else {
                wil_err(wil, "%s: unhandled iftype %d for CID %d\n",
                        __func__, wdev->iftype, evt->cid);
                goto out;
        }

        wil->sta[evt->cid].status = wil_sta_connected;
        set_bit(wil_status_fwconnected, wil->status);
        netif_tx_wake_all_queues(ndev);

out:
        if (rc)
                wil->sta[evt->cid].status = wil_sta_unused;
        clear_bit(wil_status_fwconnecting, wil->status);
        mutex_unlock(&wil->mutex);
}

static void wmi_evt_disconnect(struct wil6210_priv *wil, int id,
                               void *d, int len)
{
        struct wmi_disconnect_event *evt = d;
        u16 reason_code = le16_to_cpu(evt->protocol_reason_status);

        wil_info(wil, "Disconnect %pM reason [proto %d wmi %d]\n",
                 evt->bssid, reason_code, evt->disconnect_reason);

        wil->sinfo_gen++;

        mutex_lock(&wil->mutex);
        wil6210_disconnect(wil, evt->bssid, reason_code, true);
        mutex_unlock(&wil->mutex);
}

/*
 * Firmware reports EAPOL frame using WME event.
 * Reconstruct Ethernet frame and deliver it via normal Rx
 */
static void wmi_evt_eapol_rx(struct wil6210_priv *wil, int id,
                             void *d, int len)
{
        struct net_device *ndev = wil_to_ndev(wil);
        struct wmi_eapol_rx_event *evt = d;
        u16 eapol_len = le16_to_cpu(evt->eapol_len);
        int sz = eapol_len + ETH_HLEN;
        struct sk_buff *skb;
        struct ethhdr *eth;
        int cid;
        struct wil_net_stats *stats = NULL;

        wil_dbg_wmi(wil, "EAPOL len %d from %pM\n", eapol_len,
                    evt->src_mac);

        cid = wil_find_cid(wil, evt->src_mac);
        if (cid >= 0)
                stats = &wil->sta[cid].stats;

        if (eapol_len > 196) { /* TODO: revisit size limit */
                wil_err(wil, "EAPOL too large\n");
                return;
        }

        skb = alloc_skb(sz, GFP_KERNEL);
        if (!skb) {
                wil_err(wil, "Failed to allocate skb\n");
                return;
        }

        eth = (struct ethhdr *)skb_put(skb, ETH_HLEN);
        ether_addr_copy(eth->h_dest, ndev->dev_addr);
        ether_addr_copy(eth->h_source, evt->src_mac);
        eth->h_proto = cpu_to_be16(ETH_P_PAE);
        memcpy(skb_put(skb, eapol_len), evt->eapol, eapol_len);
        skb->protocol = eth_type_trans(skb, ndev);
        if (likely(netif_rx_ni(skb) == NET_RX_SUCCESS)) {
                ndev->stats.rx_packets++;
                ndev->stats.rx_bytes += sz;
                if (stats) {
                        stats->rx_packets++;
                        stats->rx_bytes += sz;
                }
        } else {
                ndev->stats.rx_dropped++;
                if (stats)
                        stats->rx_dropped++;
        }
}

static void wmi_evt_vring_en(struct wil6210_priv *wil, int id, void *d, int len)
{
        struct wmi_vring_en_event *evt = d;
        u8 vri = evt->vring_index;

        wil_dbg_wmi(wil, "Enable vring %d\n", vri);

        if (vri >= ARRAY_SIZE(wil->vring_tx)) {
                wil_err(wil, "Enable for invalid vring %d\n", vri);
                return;
        }
        wil->vring_tx_data[vri].dot1x_open = true;
        if (vri == wil->bcast_vring) /* no BA for bcast */
                return;
        if (agg_wsize >= 0)
                wil_addba_tx_request(wil, vri, agg_wsize);
}

static void wmi_evt_ba_status(struct wil6210_priv *wil, int id, void *d,
                              int len)
{
        struct wmi_vring_ba_status_event *evt = d;
        struct vring_tx_data *txdata;

        wil_dbg_wmi(wil, "BACK[%d] %s {%d} timeout %d AMSDU%s\n",
                    evt->ringid,
                    evt->status == WMI_BA_AGREED ? "OK" : "N/A",
                    evt->agg_wsize, __le16_to_cpu(evt->ba_timeout),
                    evt->amsdu ? "+" : "-");

        if (evt->ringid >= WIL6210_MAX_TX_RINGS) {
                wil_err(wil, "invalid ring id %d\n", evt->ringid);
                return;
        }

        if (evt->status != WMI_BA_AGREED) {
                evt->ba_timeout = 0;
                evt->agg_wsize = 0;
                evt->amsdu = 0;
        }

        txdata = &wil->vring_tx_data[evt->ringid];

        txdata->agg_timeout = le16_to_cpu(evt->ba_timeout);
        txdata->agg_wsize = evt->agg_wsize;
        txdata->agg_amsdu = evt->amsdu;
        txdata->addba_in_progress = false;
}

static void wmi_evt_addba_rx_req(struct wil6210_priv *wil, int id, void *d,
                                 int len)
{
        struct wmi_rcp_addba_req_event *evt = d;

        wil_addba_rx_request(wil, evt->cidxtid, evt->dialog_token,
                             evt->ba_param_set, evt->ba_timeout,
                             evt->ba_seq_ctrl);
}

static void wmi_evt_delba(struct wil6210_priv *wil, int id, void *d, int len)
__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
{
        struct wmi_delba_event *evt = d;
        u8 cid, tid;
        u16 reason = __le16_to_cpu(evt->reason);
        struct wil_sta_info *sta;
        struct wil_tid_ampdu_rx *r;

        might_sleep();
        parse_cidxtid(evt->cidxtid, &cid, &tid);
        wil_dbg_wmi(wil, "DELBA CID %d TID %d from %s reason %d\n",
                    cid, tid,
                    evt->from_initiator ? "originator" : "recipient",
                    reason);
        if (!evt->from_initiator) {
                int i;
                /* find Tx vring it belongs to */
                for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
                        if ((wil->vring2cid_tid[i][0] == cid) &&
                            (wil->vring2cid_tid[i][1] == tid)) {
                                struct vring_tx_data *txdata =
                                        &wil->vring_tx_data[i];

                                wil_dbg_wmi(wil, "DELBA Tx vring %d\n", i);
                                txdata->agg_timeout = 0;
                                txdata->agg_wsize = 0;
                                txdata->addba_in_progress = false;

                                break; /* max. 1 matching ring */
                        }
                }
                if (i >= ARRAY_SIZE(wil->vring2cid_tid))
                        wil_err(wil, "DELBA: unable to find Tx vring\n");
                return;
        }

        sta = &wil->sta[cid];

        spin_lock_bh(&sta->tid_rx_lock);

        r = sta->tid_rx[tid];
        sta->tid_rx[tid] = NULL;
        wil_tid_ampdu_rx_free(wil, r);

        spin_unlock_bh(&sta->tid_rx_lock);
}

/**
 * Some events are ignored for purpose; and need not be interpreted as
 * "unhandled events"
 */
static void wmi_evt_ignore(struct wil6210_priv *wil, int id, void *d, int len)
{
        wil_dbg_wmi(wil, "Ignore event 0x%04x len %d\n", id, len);
}

static const struct {
        int eventid;
        void (*handler)(struct wil6210_priv *wil, int eventid,
                        void *data, int data_len);
} wmi_evt_handlers[] = {
        {WMI_READY_EVENTID,             wmi_evt_ready},
        {WMI_FW_READY_EVENTID,                  wmi_evt_ignore},
        {WMI_RX_MGMT_PACKET_EVENTID,    wmi_evt_rx_mgmt},
        {WMI_TX_MGMT_PACKET_EVENTID,            wmi_evt_tx_mgmt},
        {WMI_SCAN_COMPLETE_EVENTID,     wmi_evt_scan_complete},
        {WMI_CONNECT_EVENTID,           wmi_evt_connect},
        {WMI_DISCONNECT_EVENTID,        wmi_evt_disconnect},
        {WMI_EAPOL_RX_EVENTID,          wmi_evt_eapol_rx},
        {WMI_BA_STATUS_EVENTID,         wmi_evt_ba_status},
        {WMI_RCP_ADDBA_REQ_EVENTID,     wmi_evt_addba_rx_req},
        {WMI_DELBA_EVENTID,             wmi_evt_delba},
        {WMI_VRING_EN_EVENTID,          wmi_evt_vring_en},
        {WMI_DATA_PORT_OPEN_EVENTID,            wmi_evt_ignore},
};

/*
 * Run in IRQ context
 * Extract WMI command from mailbox. Queue it to the @wil->pending_wmi_ev
 * that will be eventually handled by the @wmi_event_worker in the thread
 * context of thread "wil6210_wmi"
 */
void wmi_recv_cmd(struct wil6210_priv *wil)
{
        struct wil6210_mbox_ring_desc d_tail;
        struct wil6210_mbox_hdr hdr;
        struct wil6210_mbox_ring *r = &wil->mbox_ctl.rx;
        struct pending_wmi_event *evt;
        u8 *cmd;
        void __iomem *src;
        ulong flags;
        unsigned n;
        unsigned int num_immed_reply = 0;

        if (!test_bit(wil_status_mbox_ready, wil->status)) {
                wil_err(wil, "Reset in progress. Cannot handle WMI event\n");
                return;
        }

        for (n = 0;; n++) {
                u16 len;
                bool q;
                bool immed_reply = false;

                r->head = wil_r(wil, RGF_MBOX +
                                offsetof(struct wil6210_mbox_ctl, rx.head));
                if (r->tail == r->head)
                        break;

                wil_dbg_wmi(wil, "Mbox head %08x tail %08x\n",
                            r->head, r->tail);
                /* read cmd descriptor from tail */
                wil_memcpy_fromio_32(&d_tail, wil->csr + HOSTADDR(r->tail),
                                     sizeof(struct wil6210_mbox_ring_desc));
                if (d_tail.sync == 0) {
                        wil_err(wil, "Mbox evt not owned by FW?\n");
                        break;
                }

                /* read cmd header from descriptor */
                if (0 != wmi_read_hdr(wil, d_tail.addr, &hdr)) {
                        wil_err(wil, "Mbox evt at 0x%08x?\n",
                                le32_to_cpu(d_tail.addr));
                        break;
                }
                len = le16_to_cpu(hdr.len);
                wil_dbg_wmi(wil, "Mbox evt %04x %04x %04x %02x\n",
                            le16_to_cpu(hdr.seq), len, le16_to_cpu(hdr.type),
                            hdr.flags);

                /* read cmd buffer from descriptor */
                src = wmi_buffer(wil, d_tail.addr) +
                      sizeof(struct wil6210_mbox_hdr);
                evt = kmalloc(ALIGN(offsetof(struct pending_wmi_event,
                                             event.wmi) + len, 4),
                              GFP_KERNEL);
                if (!evt)
                        break;

                evt->event.hdr = hdr;
                cmd = (void *)&evt->event.wmi;
                wil_memcpy_fromio_32(cmd, src, len);
                /* mark entry as empty */
                wil_w(wil, r->tail +
                      offsetof(struct wil6210_mbox_ring_desc, sync), 0);
                /* indicate */
                if ((hdr.type == WIL_MBOX_HDR_TYPE_WMI) &&
                    (len >= sizeof(struct wil6210_mbox_hdr_wmi))) {
                        struct wil6210_mbox_hdr_wmi *wmi = &evt->event.wmi;
                        u16 id = le16_to_cpu(wmi->id);
                        u32 tstamp = le32_to_cpu(wmi->timestamp);
                        spin_lock_irqsave(&wil->wmi_ev_lock, flags);
                        if (wil->reply_id && wil->reply_id == id) {
                                if (wil->reply_buf) {
                                        memcpy(wil->reply_buf, wmi,
                                               min(len, wil->reply_size));
                                        immed_reply = true;
                                }
                        }
                        spin_unlock_irqrestore(&wil->wmi_ev_lock, flags);

                        wil_dbg_wmi(wil, "WMI event 0x%04x MID %d @%d msec\n",
                                    id, wmi->mid, tstamp);
                        trace_wil6210_wmi_event(wmi, &wmi[1],
                                                len - sizeof(*wmi));
                }
                wil_hex_dump_wmi("evt ", DUMP_PREFIX_OFFSET, 16, 1,
                                 &evt->event.hdr, sizeof(hdr) + len, true);

                /* advance tail */
                r->tail = r->base + ((r->tail - r->base +
                          sizeof(struct wil6210_mbox_ring_desc)) % r->size);
                wil_w(wil, RGF_MBOX +
                      offsetof(struct wil6210_mbox_ctl, rx.tail), r->tail);

                if (immed_reply) {
                        wil_dbg_wmi(wil, "%s: Complete WMI 0x%04x\n",
                                    __func__, wil->reply_id);
                        kfree(evt);
                        num_immed_reply++;
                        complete(&wil->wmi_call);
                } else {
                        /* add to the pending list */
                        spin_lock_irqsave(&wil->wmi_ev_lock, flags);
                        list_add_tail(&evt->list, &wil->pending_wmi_ev);
                        spin_unlock_irqrestore(&wil->wmi_ev_lock, flags);
                        q = queue_work(wil->wmi_wq, &wil->wmi_event_worker);
                        wil_dbg_wmi(wil, "queue_work -> %d\n", q);
                }
        }
        /* normally, 1 event per IRQ should be processed */
        wil_dbg_wmi(wil, "%s -> %d events queued, %d completed\n", __func__,
                    n - num_immed_reply, num_immed_reply);
}

int wmi_call(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len,
             u16 reply_id, void *reply, u8 reply_size, int to_msec)
{
        int rc;
        unsigned long remain;

        mutex_lock(&wil->wmi_mutex);

        spin_lock(&wil->wmi_ev_lock);
        wil->reply_id = reply_id;
        wil->reply_buf = reply;
        wil->reply_size = reply_size;
        spin_unlock(&wil->wmi_ev_lock);

        rc = __wmi_send(wil, cmdid, buf, len);
        if (rc)
                goto out;

        remain = wait_for_completion_timeout(&wil->wmi_call,
                                             msecs_to_jiffies(to_msec));
        if (0 == remain) {
                wil_err(wil, "wmi_call(0x%04x->0x%04x) timeout %d msec\n",
                        cmdid, reply_id, to_msec);
                rc = -ETIME;
        } else {
                wil_dbg_wmi(wil,
                            "wmi_call(0x%04x->0x%04x) completed in %d msec\n",
                            cmdid, reply_id,
                            to_msec - jiffies_to_msecs(remain));
        }

out:
        spin_lock(&wil->wmi_ev_lock);
        wil->reply_id = 0;
        wil->reply_buf = NULL;
        wil->reply_size = 0;
        spin_unlock(&wil->wmi_ev_lock);

        mutex_unlock(&wil->wmi_mutex);

        return rc;
}

int wmi_echo(struct wil6210_priv *wil)
{
        struct wmi_echo_cmd cmd = {
                .value = cpu_to_le32(0x12345678),
        };

        return wmi_call(wil, WMI_ECHO_CMDID, &cmd, sizeof(cmd),
                        WMI_ECHO_RSP_EVENTID, NULL, 0, 50);
}

int wmi_set_mac_address(struct wil6210_priv *wil, void *addr)
{
        struct wmi_set_mac_address_cmd cmd;

        ether_addr_copy(cmd.mac, addr);

        wil_dbg_wmi(wil, "Set MAC %pM\n", addr);

        return wmi_send(wil, WMI_SET_MAC_ADDRESS_CMDID, &cmd, sizeof(cmd));
}

int wmi_pcp_start(struct wil6210_priv *wil, int bi, u8 wmi_nettype,
                  u8 chan, u8 hidden_ssid)
{
        int rc;

        struct wmi_pcp_start_cmd cmd = {
                .bcon_interval = cpu_to_le16(bi),
                .network_type = wmi_nettype,
                .disable_sec_offload = 1,
                .channel = chan - 1,
                .pcp_max_assoc_sta = max_assoc_sta,
                .hidden_ssid = hidden_ssid,
        };
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_pcp_started_event evt;
        } __packed reply;

        if (!wil->privacy)
                cmd.disable_sec = 1;

        if ((cmd.pcp_max_assoc_sta > WIL6210_MAX_CID) ||
            (cmd.pcp_max_assoc_sta <= 0)) {
                wil_info(wil,
                         "Requested connection limit %u, valid values are 1 - %d. Setting to %d\n",
                         max_assoc_sta, WIL6210_MAX_CID, WIL6210_MAX_CID);
                cmd.pcp_max_assoc_sta = WIL6210_MAX_CID;
        }

        /*
         * Processing time may be huge, in case of secure AP it takes about
         * 3500ms for FW to start AP
         */
        rc = wmi_call(wil, WMI_PCP_START_CMDID, &cmd, sizeof(cmd),
                      WMI_PCP_STARTED_EVENTID, &reply, sizeof(reply), 5000);
        if (rc)
                return rc;

        if (reply.evt.status != WMI_FW_STATUS_SUCCESS)
                rc = -EINVAL;

        return rc;
}

int wmi_pcp_stop(struct wil6210_priv *wil)
{
        return wmi_call(wil, WMI_PCP_STOP_CMDID, NULL, 0,
                        WMI_PCP_STOPPED_EVENTID, NULL, 0, 20);
}

int wmi_set_ssid(struct wil6210_priv *wil, u8 ssid_len, const void *ssid)
{

        struct wmi_set_ssid_cmd cmd = {
                .ssid_len = cpu_to_le32(ssid_len),
        };

        if (ssid_len > sizeof(cmd.ssid))
                return -EINVAL;

        memcpy(cmd.ssid, ssid, ssid_len);

        return wmi_send(wil, WMI_SET_SSID_CMDID, &cmd, sizeof(cmd));
}

int wmi_get_ssid(struct wil6210_priv *wil, u8 *ssid_len, void *ssid)
{
        int rc;
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_set_ssid_cmd cmd;
        } __packed reply;
        int len; /* reply.cmd.ssid_len in CPU order */

        rc = wmi_call(wil, WMI_GET_SSID_CMDID, NULL, 0, WMI_GET_SSID_EVENTID,
                      &reply, sizeof(reply), 20);
        if (rc)
                return rc;

        len = le32_to_cpu(reply.cmd.ssid_len);
        if (len > sizeof(reply.cmd.ssid))
                return -EINVAL;

        *ssid_len = len;
        memcpy(ssid, reply.cmd.ssid, len);

        return 0;
}

int wmi_set_channel(struct wil6210_priv *wil, int channel)
{
        struct wmi_set_pcp_channel_cmd cmd = {
                .channel = channel - 1,
        };

        return wmi_send(wil, WMI_SET_PCP_CHANNEL_CMDID, &cmd, sizeof(cmd));
}

int wmi_get_channel(struct wil6210_priv *wil, int *channel)
{
        int rc;
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_set_pcp_channel_cmd cmd;
        } __packed reply;

        rc = wmi_call(wil, WMI_GET_PCP_CHANNEL_CMDID, NULL, 0,
                      WMI_GET_PCP_CHANNEL_EVENTID, &reply, sizeof(reply), 20);
        if (rc)
                return rc;

        if (reply.cmd.channel > 3)
                return -EINVAL;

        *channel = reply.cmd.channel + 1;

        return 0;
}

int wmi_p2p_cfg(struct wil6210_priv *wil, int channel)
{
        struct wmi_p2p_cfg_cmd cmd = {
                .discovery_mode = WMI_DISCOVERY_MODE_NON_OFFLOAD,
                .channel = channel - 1,
        };

        return wmi_send(wil, WMI_P2P_CFG_CMDID, &cmd, sizeof(cmd));
}

int wmi_del_cipher_key(struct wil6210_priv *wil, u8 key_index,
                       const void *mac_addr, int key_usage)
{
        struct wmi_delete_cipher_key_cmd cmd = {
                .key_index = key_index,
        };

        if (mac_addr)
                memcpy(cmd.mac, mac_addr, WMI_MAC_LEN);

        return wmi_send(wil, WMI_DELETE_CIPHER_KEY_CMDID, &cmd, sizeof(cmd));
}

int wmi_add_cipher_key(struct wil6210_priv *wil, u8 key_index,
                       const void *mac_addr, int key_len, const void *key,
                       int key_usage)
{
        struct wmi_add_cipher_key_cmd cmd = {
                .key_index = key_index,
                .key_usage = key_usage,
                .key_len = key_len,
        };

        if (!key || (key_len > sizeof(cmd.key)))
                return -EINVAL;

        memcpy(cmd.key, key, key_len);
        if (mac_addr)
                memcpy(cmd.mac, mac_addr, WMI_MAC_LEN);

        return wmi_send(wil, WMI_ADD_CIPHER_KEY_CMDID, &cmd, sizeof(cmd));
}

int wmi_set_ie(struct wil6210_priv *wil, u8 type, u16 ie_len, const void *ie)
{
        static const char *const names[] = {
                [WMI_FRAME_BEACON]      = "BEACON",
                [WMI_FRAME_PROBE_REQ]   = "PROBE_REQ",
                [WMI_FRAME_PROBE_RESP]  = "WMI_FRAME_PROBE_RESP",
                [WMI_FRAME_ASSOC_REQ]   = "WMI_FRAME_ASSOC_REQ",
                [WMI_FRAME_ASSOC_RESP]  = "WMI_FRAME_ASSOC_RESP",
        };
        int rc;
        u16 len = sizeof(struct wmi_set_appie_cmd) + ie_len;
        struct wmi_set_appie_cmd *cmd = kzalloc(len, GFP_KERNEL);

        if (!cmd) {
                rc = -ENOMEM;
                goto out;
        }
        if (!ie)
                ie_len = 0;

        cmd->mgmt_frm_type = type;
        /* BUG: FW API define ieLen as u8. Will fix FW */
        cmd->ie_len = cpu_to_le16(ie_len);
        memcpy(cmd->ie_info, ie, ie_len);
        rc = wmi_send(wil, WMI_SET_APPIE_CMDID, cmd, len);
        kfree(cmd);
out:
        if (rc) {
                const char *name = type < ARRAY_SIZE(names) ?
                                   names[type] : "??";
                wil_err(wil, "set_ie(%d %s) failed : %d\n", type, name, rc);
        }

        return rc;
}

/**
 * wmi_rxon - turn radio on/off
 * @on:         turn on if true, off otherwise
 *
 * Only switch radio. Channel should be set separately.
 * No timeout for rxon - radio turned on forever unless some other call
 * turns it off
 */
int wmi_rxon(struct wil6210_priv *wil, bool on)
{
        int rc;
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_listen_started_event evt;
        } __packed reply;

        wil_info(wil, "%s(%s)\n", __func__, on ? "on" : "off");

        if (on) {
                rc = wmi_call(wil, WMI_START_LISTEN_CMDID, NULL, 0,
                              WMI_LISTEN_STARTED_EVENTID,
                              &reply, sizeof(reply), 100);
                if ((rc == 0) && (reply.evt.status != WMI_FW_STATUS_SUCCESS))
                        rc = -EINVAL;
        } else {
                rc = wmi_call(wil, WMI_DISCOVERY_STOP_CMDID, NULL, 0,
                              WMI_DISCOVERY_STOPPED_EVENTID, NULL, 0, 20);
        }

        return rc;
}

int wmi_rx_chain_add(struct wil6210_priv *wil, struct vring *vring)
{
        struct wireless_dev *wdev = wil->wdev;
        struct net_device *ndev = wil_to_ndev(wil);
        struct wmi_cfg_rx_chain_cmd cmd = {
                .action = WMI_RX_CHAIN_ADD,
                .rx_sw_ring = {
                        .max_mpdu_size = cpu_to_le16(wil_mtu2macbuf(mtu_max)),
                        .ring_mem_base = cpu_to_le64(vring->pa),
                        .ring_size = cpu_to_le16(vring->size),
                },
                .mid = 0, /* TODO - what is it? */
                .decap_trans_type = WMI_DECAP_TYPE_802_3,
                .reorder_type = WMI_RX_SW_REORDER,
                .host_thrsh = cpu_to_le16(rx_ring_overflow_thrsh),
        };
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_cfg_rx_chain_done_event evt;
        } __packed evt;
        int rc;

        if (wdev->iftype == NL80211_IFTYPE_MONITOR) {
                struct ieee80211_channel *ch = wdev->preset_chandef.chan;

                cmd.sniffer_cfg.mode = cpu_to_le32(WMI_SNIFFER_ON);
                if (ch)
                        cmd.sniffer_cfg.channel = ch->hw_value - 1;
                cmd.sniffer_cfg.phy_info_mode =
                        cpu_to_le32(ndev->type == ARPHRD_IEEE80211_RADIOTAP);
                cmd.sniffer_cfg.phy_support =
                        cpu_to_le32((wil->monitor_flags & MONITOR_FLAG_CONTROL)
                                    ? WMI_SNIFFER_CP : WMI_SNIFFER_BOTH_PHYS);
        } else {
                /* Initialize offload (in non-sniffer mode).
                 * Linux IP stack always calculates IP checksum
                 * HW always calculate TCP/UDP checksum
                 */
                cmd.l3_l4_ctrl |= (1 << L3_L4_CTRL_TCPIP_CHECKSUM_EN_POS);
        }

        if (rx_align_2)
                cmd.l2_802_3_offload_ctrl |=
                                L2_802_3_OFFLOAD_CTRL_SNAP_KEEP_MSK;

        /* typical time for secure PCP is 840ms */
        rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd),
                      WMI_CFG_RX_CHAIN_DONE_EVENTID, &evt, sizeof(evt), 2000);
        if (rc)
                return rc;

        vring->hwtail = le32_to_cpu(evt.evt.rx_ring_tail_ptr);

        wil_dbg_misc(wil, "Rx init: status %d tail 0x%08x\n",
                     le32_to_cpu(evt.evt.status), vring->hwtail);

        if (le32_to_cpu(evt.evt.status) != WMI_CFG_RX_CHAIN_SUCCESS)
                rc = -EINVAL;

        return rc;
}

int wmi_get_temperature(struct wil6210_priv *wil, u32 *t_bb, u32 *t_rf)
{
        int rc;
        struct wmi_temp_sense_cmd cmd = {
                .measure_baseband_en = cpu_to_le32(!!t_bb),
                .measure_rf_en = cpu_to_le32(!!t_rf),
                .measure_mode = cpu_to_le32(TEMPERATURE_MEASURE_NOW),
        };
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_temp_sense_done_event evt;
        } __packed reply;

        rc = wmi_call(wil, WMI_TEMP_SENSE_CMDID, &cmd, sizeof(cmd),
                      WMI_TEMP_SENSE_DONE_EVENTID, &reply, sizeof(reply), 100);
        if (rc)
                return rc;

        if (t_bb)
                *t_bb = le32_to_cpu(reply.evt.baseband_t1000);
        if (t_rf)
                *t_rf = le32_to_cpu(reply.evt.rf_t1000);

        return 0;
}

int wmi_disconnect_sta(struct wil6210_priv *wil, const u8 *mac, u16 reason,
                       bool full_disconnect)
{
        int rc;
        u16 reason_code;
        struct wmi_disconnect_sta_cmd cmd = {
                .disconnect_reason = cpu_to_le16(reason),
        };
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_disconnect_event evt;
        } __packed reply;

        ether_addr_copy(cmd.dst_mac, mac);

        wil_dbg_wmi(wil, "%s(%pM, reason %d)\n", __func__, mac, reason);

        rc = wmi_call(wil, WMI_DISCONNECT_STA_CMDID, &cmd, sizeof(cmd),
                      WMI_DISCONNECT_EVENTID, &reply, sizeof(reply), 1000);
        /* failure to disconnect in reasonable time treated as FW error */
        if (rc) {
                wil_fw_error_recovery(wil);
                return rc;
        }

        if (full_disconnect) {
                /* call event handler manually after processing wmi_call,
                 * to avoid deadlock - disconnect event handler acquires
                 * wil->mutex while it is already held here
                 */
                reason_code = le16_to_cpu(reply.evt.protocol_reason_status);

                wil_dbg_wmi(wil, "Disconnect %pM reason [proto %d wmi %d]\n",
                            reply.evt.bssid, reason_code,
                            reply.evt.disconnect_reason);

                wil->sinfo_gen++;
                wil6210_disconnect(wil, reply.evt.bssid, reason_code, true);
        }
        return 0;
}

int wmi_addba(struct wil6210_priv *wil, u8 ringid, u8 size, u16 timeout)
{
        struct wmi_vring_ba_en_cmd cmd = {
                .ringid = ringid,
                .agg_max_wsize = size,
                .ba_timeout = cpu_to_le16(timeout),
                .amsdu = 0,
        };

        wil_dbg_wmi(wil, "%s(ring %d size %d timeout %d)\n", __func__,
                    ringid, size, timeout);

        return wmi_send(wil, WMI_VRING_BA_EN_CMDID, &cmd, sizeof(cmd));
}

int wmi_delba_tx(struct wil6210_priv *wil, u8 ringid, u16 reason)
{
        struct wmi_vring_ba_dis_cmd cmd = {
                .ringid = ringid,
                .reason = cpu_to_le16(reason),
        };

        wil_dbg_wmi(wil, "%s(ring %d reason %d)\n", __func__,
                    ringid, reason);

        return wmi_send(wil, WMI_VRING_BA_DIS_CMDID, &cmd, sizeof(cmd));
}

int wmi_delba_rx(struct wil6210_priv *wil, u8 cidxtid, u16 reason)
{
        struct wmi_rcp_delba_cmd cmd = {
                .cidxtid = cidxtid,
                .reason = cpu_to_le16(reason),
        };

        wil_dbg_wmi(wil, "%s(CID %d TID %d reason %d)\n", __func__,
                    cidxtid & 0xf, (cidxtid >> 4) & 0xf, reason);

        return wmi_send(wil, WMI_RCP_DELBA_CMDID, &cmd, sizeof(cmd));
}

int wmi_addba_rx_resp(struct wil6210_priv *wil, u8 cid, u8 tid, u8 token,
                      u16 status, bool amsdu, u16 agg_wsize, u16 timeout)
{
        int rc;
        struct wmi_rcp_addba_resp_cmd cmd = {
                .cidxtid = mk_cidxtid(cid, tid),
                .dialog_token = token,
                .status_code = cpu_to_le16(status),
                /* bit 0: A-MSDU supported
                 * bit 1: policy (should be 0 for us)
                 * bits 2..5: TID
                 * bits 6..15: buffer size
                 */
                .ba_param_set = cpu_to_le16((amsdu ? 1 : 0) | (tid << 2) |
                                            (agg_wsize << 6)),
                .ba_timeout = cpu_to_le16(timeout),
        };
        struct {
                struct wil6210_mbox_hdr_wmi wmi;
                struct wmi_rcp_addba_resp_sent_event evt;
        } __packed reply;

        wil_dbg_wmi(wil,
                    "ADDBA response for CID %d TID %d size %d timeout %d status %d AMSDU%s\n",
                    cid, tid, agg_wsize, timeout, status, amsdu ? "+" : "-");

        rc = wmi_call(wil, WMI_RCP_ADDBA_RESP_CMDID, &cmd, sizeof(cmd),
                      WMI_RCP_ADDBA_RESP_SENT_EVENTID, &reply, sizeof(reply),
                      100);
        if (rc)
                return rc;

        if (reply.evt.status) {
                wil_err(wil, "ADDBA response failed with status %d\n",
                        le16_to_cpu(reply.evt.status));
                rc = -EINVAL;
        }

        return rc;
}

void wmi_event_flush(struct wil6210_priv *wil)
{
        struct pending_wmi_event *evt, *t;

        wil_dbg_wmi(wil, "%s()\n", __func__);

        list_for_each_entry_safe(evt, t, &wil->pending_wmi_ev, list) {
                list_del(&evt->list);
                kfree(evt);
        }
}

static bool wmi_evt_call_handler(struct wil6210_priv *wil, int id,
                                 void *d, int len)
{
        uint i;

        for (i = 0; i < ARRAY_SIZE(wmi_evt_handlers); i++) {
                if (wmi_evt_handlers[i].eventid == id) {
                        wmi_evt_handlers[i].handler(wil, id, d, len);
                        return true;
                }
        }

        return false;
}

static void wmi_event_handle(struct wil6210_priv *wil,
                             struct wil6210_mbox_hdr *hdr)
{
        u16 len = le16_to_cpu(hdr->len);

        if ((hdr->type == WIL_MBOX_HDR_TYPE_WMI) &&
            (len >= sizeof(struct wil6210_mbox_hdr_wmi))) {
                struct wil6210_mbox_hdr_wmi *wmi = (void *)(&hdr[1]);
                void *evt_data = (void *)(&wmi[1]);
                u16 id = le16_to_cpu(wmi->id);

                wil_dbg_wmi(wil, "Handle WMI 0x%04x (reply_id 0x%04x)\n",
                            id, wil->reply_id);
                /* check if someone waits for this event */
                if (wil->reply_id && wil->reply_id == id) {
                        WARN_ON(wil->reply_buf);
                        wmi_evt_call_handler(wil, id, evt_data,
                                             len - sizeof(*wmi));
                        wil_dbg_wmi(wil, "%s: Complete WMI 0x%04x\n",
                                    __func__, id);
                        complete(&wil->wmi_call);
                        return;
                }
                /* unsolicited event */
                /* search for handler */
                if (!wmi_evt_call_handler(wil, id, evt_data,
                                          len - sizeof(*wmi))) {
                        wil_info(wil, "Unhandled event 0x%04x\n", id);
                }
        } else {
                wil_err(wil, "Unknown event type\n");
                print_hex_dump(KERN_ERR, "evt?? ", DUMP_PREFIX_OFFSET, 16, 1,
                               hdr, sizeof(*hdr) + len, true);
        }
}

/*
 * Retrieve next WMI event from the pending list
 */
static struct list_head *next_wmi_ev(struct wil6210_priv *wil)
{
        ulong flags;
        struct list_head *ret = NULL;

        spin_lock_irqsave(&wil->wmi_ev_lock, flags);

        if (!list_empty(&wil->pending_wmi_ev)) {
                ret = wil->pending_wmi_ev.next;
                list_del(ret);
        }

        spin_unlock_irqrestore(&wil->wmi_ev_lock, flags);

        return ret;
}

/*
 * Handler for the WMI events
 */
void wmi_event_worker(struct work_struct *work)
{
        struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
                                                 wmi_event_worker);
        struct pending_wmi_event *evt;
        struct list_head *lh;

        wil_dbg_wmi(wil, "Start %s\n", __func__);
        while ((lh = next_wmi_ev(wil)) != NULL) {
                evt = list_entry(lh, struct pending_wmi_event, list);
                wmi_event_handle(wil, &evt->event.hdr);
                kfree(evt);
        }
        wil_dbg_wmi(wil, "Finished %s\n", __func__);
}