// SPDX-License-Identifier: GPL-2.0-only
/*
 * Implementation of mac80211 API.
 *
 * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
 * Copyright (c) 2010, ST-Ericsson
 */
#include <linux/etherdevice.h>
#include <net/mac80211.h>

#include "sta.h"
#include "wfx.h"
#include "fwio.h"
#include "bh.h"
#include "key.h"
#include "scan.h"
#include "debug.h"
#include "hif_tx.h"
#include "hif_tx_mib.h"

#define HIF_MAX_ARP_IP_ADDRTABLE_ENTRIES 2

u32 wfx_rate_mask_to_hw(struct wfx_dev *wdev, u32 rates)
{
	int i;
	u32 ret = 0;
	// WFx only support 2GHz
	struct ieee80211_supported_band *sband = wdev->hw->wiphy->bands[NL80211_BAND_2GHZ];

	for (i = 0; i < sband->n_bitrates; i++) {
		if (rates & BIT(i)) {
			if (i >= sband->n_bitrates)
				dev_warn(wdev->dev, "unsupported basic rate\n");
			else
				ret |= BIT(sband->bitrates[i].hw_value);
		}
	}
	return ret;
}

void wfx_cooling_timeout_work(struct work_struct *work)
{
	struct wfx_dev *wdev = container_of(to_delayed_work(work),
					    struct wfx_dev,
					    cooling_timeout_work);

	wdev->chip_frozen = true;
	wfx_tx_unlock(wdev);
}

void wfx_suspend_hot_dev(struct wfx_dev *wdev, enum sta_notify_cmd cmd)
{
	if (cmd == STA_NOTIFY_AWAKE) {
		// Device recover normal temperature
		if (cancel_delayed_work(&wdev->cooling_timeout_work))
			wfx_tx_unlock(wdev);
	} else {
		// Device is too hot
		schedule_delayed_work(&wdev->cooling_timeout_work, 10 * HZ);
		wfx_tx_lock(wdev);
	}
}

static void wfx_filter_beacon(struct wfx_vif *wvif, bool filter_beacon)
{
	const struct hif_ie_table_entry filter_ies[] = {
		{
			.ie_id        = WLAN_EID_VENDOR_SPECIFIC,
			.has_changed  = 1,
			.no_longer    = 1,
			.has_appeared = 1,
			.oui          = { 0x50, 0x6F, 0x9A },
		}, {
			.ie_id        = WLAN_EID_HT_OPERATION,
			.has_changed  = 1,
			.no_longer    = 1,
			.has_appeared = 1,
		}, {
			.ie_id        = WLAN_EID_ERP_INFO,
			.has_changed  = 1,
			.no_longer    = 1,
			.has_appeared = 1,
		}
	};

	if (!filter_beacon) {
		hif_beacon_filter_control(wvif, 0, 1);
	} else {
		hif_set_beacon_filter_table(wvif, 3, filter_ies);
		hif_beacon_filter_control(wvif, HIF_BEACON_FILTER_ENABLE, 0);
	}
}

void wfx_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
			  unsigned int *total_flags, u64 unused)
{
	struct wfx_vif *wvif = NULL;
	struct wfx_dev *wdev = hw->priv;
	bool filter_bssid, filter_prbreq, filter_beacon;

	// Notes:
	//   - Probe responses (FIF_BCN_PRBRESP_PROMISC) are never filtered
	//   - PS-Poll (FIF_PSPOLL) are never filtered
	//   - RTS, CTS and Ack (FIF_CONTROL) are always filtered
	//   - Broken frames (FIF_FCSFAIL and FIF_PLCPFAIL) are always filtered
	//   - Firmware does (yet) allow to forward unicast traffic sent to
	//     other stations (aka. promiscuous mode)
	*total_flags &= FIF_BCN_PRBRESP_PROMISC | FIF_ALLMULTI | FIF_OTHER_BSS |
			FIF_PROBE_REQ | FIF_PSPOLL;

	mutex_lock(&wdev->conf_mutex);
	while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
		mutex_lock(&wvif->scan_lock);

		// Note: FIF_BCN_PRBRESP_PROMISC covers probe response and
		// beacons from other BSS
		if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
			filter_beacon = false;
		else
			filter_beacon = true;
		wfx_filter_beacon(wvif, filter_beacon);

		if (*total_flags & FIF_OTHER_BSS)
			filter_bssid = false;
		else
			filter_bssid = true;

		// In AP mode, chip can reply to probe request itself
		if (*total_flags & FIF_PROBE_REQ &&
		    wvif->vif->type == NL80211_IFTYPE_AP) {
			dev_dbg(wdev->dev, "do not forward probe request in AP mode\n");
			*total_flags &= ~FIF_PROBE_REQ;
		}

		if (*total_flags & FIF_PROBE_REQ)
			filter_prbreq = false;
		else
			filter_prbreq = true;
		hif_set_rx_filter(wvif, filter_bssid, filter_prbreq);

		mutex_unlock(&wvif->scan_lock);
	}
	mutex_unlock(&wdev->conf_mutex);
}

static int wfx_get_ps_timeout(struct wfx_vif *wvif, bool *enable_ps)
{
	struct ieee80211_channel *chan0 = NULL, *chan1 = NULL;
	struct ieee80211_conf *conf = &wvif->wdev->hw->conf;

	WARN(!wvif->vif->bss_conf.assoc && enable_ps,
	     "enable_ps is reliable only if associated");
	if (wdev_to_wvif(wvif->wdev, 0))
		chan0 = wdev_to_wvif(wvif->wdev, 0)->vif->bss_conf.chandef.chan;
	if (wdev_to_wvif(wvif->wdev, 1))
		chan1 = wdev_to_wvif(wvif->wdev, 1)->vif->bss_conf.chandef.chan;
	if (chan0 && chan1 && chan0->hw_value != chan1->hw_value &&
	    wvif->vif->type != NL80211_IFTYPE_AP) {
		// It is necessary to enable powersave if channels
		// are different.
		if (enable_ps)
			*enable_ps = true;
		if (wvif->wdev->force_ps_timeout > -1)
			return wvif->wdev->force_ps_timeout;
		else if (wfx_api_older_than(wvif->wdev, 3, 2))
			return 0;
		else
			return 30;
	}
	if (enable_ps)
		*enable_ps = wvif->vif->bss_conf.ps;
	if (wvif->wdev->force_ps_timeout > -1)
		return wvif->wdev->force_ps_timeout;
	else if (wvif->vif->bss_conf.assoc && wvif->vif->bss_conf.ps)
		return conf->dynamic_ps_timeout;
	else
		return -1;
}

int wfx_update_pm(struct wfx_vif *wvif)
{
	int ps_timeout;
	bool ps;

	if (!wvif->vif->bss_conf.assoc)
		return 0;
	ps_timeout = wfx_get_ps_timeout(wvif, &ps);
	if (!ps)
		ps_timeout = 0;
	WARN_ON(ps_timeout < 0);
	if (wvif->uapsd_mask)
		ps_timeout = 0;

	if (!wait_for_completion_timeout(&wvif->set_pm_mode_complete,
					 TU_TO_JIFFIES(512)))
		dev_warn(wvif->wdev->dev,
			 "timeout while waiting of set_pm_mode_complete\n");
	return hif_set_pm(wvif, ps, ps_timeout);
}

int wfx_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		   u16 queue, const struct ieee80211_tx_queue_params *params)
{
	struct wfx_dev *wdev = hw->priv;
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	int old_uapsd = wvif->uapsd_mask;

	WARN_ON(queue >= hw->queues);

	mutex_lock(&wdev->conf_mutex);
	assign_bit(queue, &wvif->uapsd_mask, params->uapsd);
	hif_set_edca_queue_params(wvif, queue, params);
	if (wvif->vif->type == NL80211_IFTYPE_STATION &&
	    old_uapsd != wvif->uapsd_mask) {
		hif_set_uapsd_info(wvif, wvif->uapsd_mask);
		wfx_update_pm(wvif);
	}
	mutex_unlock(&wdev->conf_mutex);
	return 0;
}

int wfx_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
	struct wfx_dev *wdev = hw->priv;
	struct wfx_vif *wvif = NULL;

	while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
		hif_rts_threshold(wvif, value);
	return 0;
}

/* WSM callbacks */

void wfx_event_report_rssi(struct wfx_vif *wvif, u8 raw_rcpi_rssi)
{
	/* RSSI: signed Q8.0, RCPI: unsigned Q7.1
	 * RSSI = RCPI / 2 - 110
	 */
	int rcpi_rssi;
	int cqm_evt;

	rcpi_rssi = raw_rcpi_rssi / 2 - 110;
	if (rcpi_rssi <= wvif->vif->bss_conf.cqm_rssi_thold)
		cqm_evt = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
	else
		cqm_evt = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
	ieee80211_cqm_rssi_notify(wvif->vif, cqm_evt, rcpi_rssi, GFP_KERNEL);
}

static void wfx_beacon_loss_work(struct work_struct *work)
{
	struct wfx_vif *wvif = container_of(to_delayed_work(work),
					    struct wfx_vif, beacon_loss_work);
	struct ieee80211_bss_conf *bss_conf = &wvif->vif->bss_conf;

	ieee80211_beacon_loss(wvif->vif);
	schedule_delayed_work(to_delayed_work(work),
			      msecs_to_jiffies(bss_conf->beacon_int));
}

void wfx_set_default_unicast_key(struct ieee80211_hw *hw,
				 struct ieee80211_vif *vif, int idx)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	hif_wep_default_key_id(wvif, idx);
}

void wfx_reset(struct wfx_vif *wvif)
{
	struct wfx_dev *wdev = wvif->wdev;

	wfx_tx_lock_flush(wdev);
	hif_reset(wvif, false);
	wfx_tx_policy_init(wvif);
	if (wvif_count(wdev) <= 1)
		hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
	wfx_tx_unlock(wdev);
	wvif->join_in_progress = false;
	cancel_delayed_work_sync(&wvif->beacon_loss_work);
	wvif =  NULL;
	while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
		wfx_update_pm(wvif);
}

int wfx_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		struct ieee80211_sta *sta)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	struct wfx_sta_priv *sta_priv = (struct wfx_sta_priv *)&sta->drv_priv;

	sta_priv->vif_id = wvif->id;

	if (vif->type == NL80211_IFTYPE_STATION)
		hif_set_mfp(wvif, sta->mfp, sta->mfp);

	// In station mode, the firmware interprets new link-id as a TDLS peer.
	if (vif->type == NL80211_IFTYPE_STATION && !sta->tdls)
		return 0;
	sta_priv->link_id = ffz(wvif->link_id_map);
	wvif->link_id_map |= BIT(sta_priv->link_id);
	WARN_ON(!sta_priv->link_id);
	WARN_ON(sta_priv->link_id >= HIF_LINK_ID_MAX);
	hif_map_link(wvif, false, sta->addr, sta_priv->link_id, sta->mfp);

	return 0;
}

int wfx_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		   struct ieee80211_sta *sta)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	struct wfx_sta_priv *sta_priv = (struct wfx_sta_priv *)&sta->drv_priv;

	// See note in wfx_sta_add()
	if (!sta_priv->link_id)
		return 0;
	// FIXME add a mutex?
	hif_map_link(wvif, true, sta->addr, sta_priv->link_id, false);
	wvif->link_id_map &= ~BIT(sta_priv->link_id);
	return 0;
}

static int wfx_upload_ap_templates(struct wfx_vif *wvif)
{
	struct sk_buff *skb;

	skb = ieee80211_beacon_get(wvif->wdev->hw, wvif->vif);
	if (!skb)
		return -ENOMEM;
	hif_set_template_frame(wvif, skb, HIF_TMPLT_BCN,
			       API_RATE_INDEX_B_1MBPS);
	dev_kfree_skb(skb);

	skb = ieee80211_proberesp_get(wvif->wdev->hw, wvif->vif);
	if (!skb)
		return -ENOMEM;
	hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBRES,
			       API_RATE_INDEX_B_1MBPS);
	dev_kfree_skb(skb);
	return 0;
}

static void wfx_set_mfp_ap(struct wfx_vif *wvif)
{
	struct sk_buff *skb = ieee80211_beacon_get(wvif->wdev->hw, wvif->vif);
	const int ieoffset = offsetof(struct ieee80211_mgmt, u.beacon.variable);
	const u16 *ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN,
						 skb->data + ieoffset,
						 skb->len - ieoffset);
	const int pairwise_cipher_suite_count_offset = 8 / sizeof(u16);
	const int pairwise_cipher_suite_size = 4 / sizeof(u16);
	const int akm_suite_size = 4 / sizeof(u16);

	if (ptr) {
		ptr += pairwise_cipher_suite_count_offset;
		if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
			return;
		ptr += 1 + pairwise_cipher_suite_size * *ptr;
		if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
			return;
		ptr += 1 + akm_suite_size * *ptr;
		if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
			return;
		hif_set_mfp(wvif, *ptr & BIT(7), *ptr & BIT(6));
	}
}

int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	struct wfx_dev *wdev = wvif->wdev;
	int ret;

	wvif =  NULL;
	while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
		wfx_update_pm(wvif);
	wvif = (struct wfx_vif *)vif->drv_priv;
	wfx_upload_ap_templates(wvif);
	ret = hif_start(wvif, &vif->bss_conf, wvif->channel);
	if (ret > 0)
		return -EIO;
	wfx_set_mfp_ap(wvif);
	return ret;
}

void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	wfx_reset(wvif);
}

static void wfx_join(struct wfx_vif *wvif)
{
	int ret;
	struct ieee80211_bss_conf *conf = &wvif->vif->bss_conf;
	struct cfg80211_bss *bss = NULL;
	u8 ssid[IEEE80211_MAX_SSID_LEN];
	const u8 *ssidie = NULL;
	int ssidlen = 0;

	wfx_tx_lock_flush(wvif->wdev);

	bss = cfg80211_get_bss(wvif->wdev->hw->wiphy, wvif->channel,
			       conf->bssid, NULL, 0,
			       IEEE80211_BSS_TYPE_ANY, IEEE80211_PRIVACY_ANY);
	if (!bss && !conf->ibss_joined) {
		wfx_tx_unlock(wvif->wdev);
		return;
	}

	rcu_read_lock(); // protect ssidie
	if (bss)
		ssidie = ieee80211_bss_get_ie(bss, WLAN_EID_SSID);
	if (ssidie) {
		ssidlen = ssidie[1];
		if (ssidlen > IEEE80211_MAX_SSID_LEN)
			ssidlen = IEEE80211_MAX_SSID_LEN;
		memcpy(ssid, &ssidie[2], ssidlen);
	}
	rcu_read_unlock();

	cfg80211_put_bss(wvif->wdev->hw->wiphy, bss);

	wvif->join_in_progress = true;
	ret = hif_join(wvif, conf, wvif->channel, ssid, ssidlen);
	if (ret) {
		ieee80211_connection_loss(wvif->vif);
		wfx_reset(wvif);
	} else {
		/* Due to beacon filtering it is possible that the
		 * AP's beacon is not known for the mac80211 stack.
		 * Disable filtering temporary to make sure the stack
		 * receives at least one
		 */
		wfx_filter_beacon(wvif, false);
	}
	wfx_tx_unlock(wvif->wdev);
}

static void wfx_join_finalize(struct wfx_vif *wvif,
			      struct ieee80211_bss_conf *info)
{
	struct ieee80211_sta *sta = NULL;
	int ampdu_density = 0;
	bool greenfield = false;

	rcu_read_lock(); // protect sta
	if (info->bssid && !info->ibss_joined)
		sta = ieee80211_find_sta(wvif->vif, info->bssid);
	if (sta && sta->ht_cap.ht_supported)
		ampdu_density = sta->ht_cap.ampdu_density;
	if (sta && sta->ht_cap.ht_supported &&
	    !(info->ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT))
		greenfield = !!(sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD);
	rcu_read_unlock();

	wvif->join_in_progress = false;
	hif_set_association_mode(wvif, ampdu_density, greenfield,
				 info->use_short_preamble);
	hif_keep_alive_period(wvif, 0);
	// beacon_loss_count is defined to 7 in net/mac80211/mlme.c. Let's use
	// the same value.
	hif_set_bss_params(wvif, info->aid, 7);
	hif_set_beacon_wakeup_period(wvif, 1, 1);
	wfx_update_pm(wvif);
}

int wfx_join_ibss(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	wfx_upload_ap_templates(wvif);
	wfx_join(wvif);
	return 0;
}

void wfx_leave_ibss(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	wfx_reset(wvif);
}

static void wfx_enable_beacon(struct wfx_vif *wvif, bool enable)
{
	// Driver has Content After DTIM Beacon in queue. Driver is waiting for
	// a signal from the firmware. Since we are going to stop to send
	// beacons, this signal will never happens. See also
	// wfx_suspend_resume_mc()
	if (!enable && wfx_tx_queues_has_cab(wvif)) {
		wvif->after_dtim_tx_allowed = true;
		wfx_bh_request_tx(wvif->wdev);
	}
	hif_beacon_transmit(wvif, enable);
}

void wfx_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			  struct ieee80211_bss_conf *info, u32 changed)
{
	struct wfx_dev *wdev = hw->priv;
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	int i;

	mutex_lock(&wdev->conf_mutex);

	if (changed & BSS_CHANGED_BASIC_RATES ||
	    changed & BSS_CHANGED_BEACON_INT ||
	    changed & BSS_CHANGED_BSSID) {
		if (vif->type == NL80211_IFTYPE_STATION)
			wfx_join(wvif);
	}

	if (changed & BSS_CHANGED_ASSOC) {
		if (info->assoc || info->ibss_joined)
			wfx_join_finalize(wvif, info);
		else if (!info->assoc && vif->type == NL80211_IFTYPE_STATION)
			wfx_reset(wvif);
		else
			dev_warn(wdev->dev, "%s: misunderstood change: ASSOC\n",
				 __func__);
	}

	if (changed & BSS_CHANGED_BEACON_INFO) {
		if (vif->type != NL80211_IFTYPE_STATION)
			dev_warn(wdev->dev, "%s: misunderstood change: BEACON_INFO\n",
				 __func__);
		hif_set_beacon_wakeup_period(wvif, info->dtim_period,
					     info->dtim_period);
		// We temporary forwarded beacon for join process. It is now no
		// more necessary.
		wfx_filter_beacon(wvif, true);
	}

	if (changed & BSS_CHANGED_ARP_FILTER) {
		for (i = 0; i < HIF_MAX_ARP_IP_ADDRTABLE_ENTRIES; i++) {
			__be32 *arp_addr = &info->arp_addr_list[i];

			if (info->arp_addr_cnt > HIF_MAX_ARP_IP_ADDRTABLE_ENTRIES)
				arp_addr = NULL;
			if (i >= info->arp_addr_cnt)
				arp_addr = NULL;
			hif_set_arp_ipv4_filter(wvif, i, arp_addr);
		}
	}

	if (changed & BSS_CHANGED_AP_PROBE_RESP ||
	    changed & BSS_CHANGED_BEACON)
		wfx_upload_ap_templates(wvif);

	if (changed & BSS_CHANGED_BEACON_ENABLED)
		wfx_enable_beacon(wvif, info->enable_beacon);

	if (changed & BSS_CHANGED_KEEP_ALIVE)
		hif_keep_alive_period(wvif, info->max_idle_period *
					    USEC_PER_TU / USEC_PER_MSEC);

	if (changed & BSS_CHANGED_ERP_CTS_PROT)
		hif_erp_use_protection(wvif, info->use_cts_prot);

	if (changed & BSS_CHANGED_ERP_SLOT)
		hif_slot_time(wvif, info->use_short_slot ? 9 : 20);

	if (changed & BSS_CHANGED_CQM)
		hif_set_rcpi_rssi_threshold(wvif, info->cqm_rssi_thold,
					    info->cqm_rssi_hyst);

	if (changed & BSS_CHANGED_TXPOWER)
		hif_set_output_power(wvif, info->txpower);

	if (changed & BSS_CHANGED_PS)
		wfx_update_pm(wvif);

	mutex_unlock(&wdev->conf_mutex);
}

static int wfx_update_tim(struct wfx_vif *wvif)
{
	struct sk_buff *skb;
	u16 tim_offset, tim_length;
	u8 *tim_ptr;

	skb = ieee80211_beacon_get_tim(wvif->wdev->hw, wvif->vif,
				       &tim_offset, &tim_length);
	if (!skb)
		return -ENOENT;
	tim_ptr = skb->data + tim_offset;

	if (tim_offset && tim_length >= 6) {
		/* Ignore DTIM count from mac80211:
		 * firmware handles DTIM internally.
		 */
		tim_ptr[2] = 0;

		/* Set/reset aid0 bit */
		if (wfx_tx_queues_has_cab(wvif))
			tim_ptr[4] |= 1;
		else
			tim_ptr[4] &= ~1;
	}

	hif_update_ie_beacon(wvif, tim_ptr, tim_length);
	dev_kfree_skb(skb);

	return 0;
}

static void wfx_update_tim_work(struct work_struct *work)
{
	struct wfx_vif *wvif = container_of(work, struct wfx_vif, update_tim_work);

	wfx_update_tim(wvif);
}

int wfx_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta, bool set)
{
	struct wfx_dev *wdev = hw->priv;
	struct wfx_sta_priv *sta_dev = (struct wfx_sta_priv *)&sta->drv_priv;
	struct wfx_vif *wvif = wdev_to_wvif(wdev, sta_dev->vif_id);

	if (!wvif) {
		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
		return -EIO;
	}
	schedule_work(&wvif->update_tim_work);
	return 0;
}

void wfx_suspend_resume_mc(struct wfx_vif *wvif, enum sta_notify_cmd notify_cmd)
{
	if (notify_cmd != STA_NOTIFY_AWAKE)
		return;
	WARN(!wfx_tx_queues_has_cab(wvif), "incorrect sequence");
	WARN(wvif->after_dtim_tx_allowed, "incorrect sequence");
	wvif->after_dtim_tx_allowed = true;
	wfx_bh_request_tx(wvif->wdev);
}

int wfx_ampdu_action(struct ieee80211_hw *hw,
		     struct ieee80211_vif *vif,
		     struct ieee80211_ampdu_params *params)
{
	// Aggregation is implemented fully in firmware
	switch (params->action) {
	case IEEE80211_AMPDU_RX_START:
	case IEEE80211_AMPDU_RX_STOP:
		// Just acknowledge it to enable frame re-ordering
		return 0;
	default:
		// Leave the firmware doing its business for tx aggregation
		return -ENOTSUPP;
	}
}

int wfx_add_chanctx(struct ieee80211_hw *hw,
		    struct ieee80211_chanctx_conf *conf)
{
	return 0;
}

void wfx_remove_chanctx(struct ieee80211_hw *hw,
			struct ieee80211_chanctx_conf *conf)
{
}

void wfx_change_chanctx(struct ieee80211_hw *hw,
			struct ieee80211_chanctx_conf *conf,
			u32 changed)
{
}

int wfx_assign_vif_chanctx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			   struct ieee80211_chanctx_conf *conf)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	struct ieee80211_channel *ch = conf->def.chan;

	WARN(wvif->channel, "channel overwrite");
	wvif->channel = ch;

	return 0;
}

void wfx_unassign_vif_chanctx(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif,
			      struct ieee80211_chanctx_conf *conf)
{
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
	struct ieee80211_channel *ch = conf->def.chan;

	WARN(wvif->channel != ch, "channel mismatch");
	wvif->channel = NULL;
}

int wfx_config(struct ieee80211_hw *hw, u32 changed)
{
	return 0;
}

int wfx_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	int i, ret = 0;
	struct wfx_dev *wdev = hw->priv;
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER |
			     IEEE80211_VIF_SUPPORTS_UAPSD |
			     IEEE80211_VIF_SUPPORTS_CQM_RSSI;

	mutex_lock(&wdev->conf_mutex);

	switch (vif->type) {
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_AP:
		break;
	default:
		mutex_unlock(&wdev->conf_mutex);
		return -EOPNOTSUPP;
	}

	// FIXME: prefer use of container_of() to get vif
	wvif->vif = vif;
	wvif->wdev = wdev;

	wvif->link_id_map = 1; // link-id 0 is reserved for multicast
	INIT_WORK(&wvif->update_tim_work, wfx_update_tim_work);
	INIT_DELAYED_WORK(&wvif->beacon_loss_work, wfx_beacon_loss_work);

	init_completion(&wvif->set_pm_mode_complete);
	complete(&wvif->set_pm_mode_complete);
	INIT_WORK(&wvif->tx_policy_upload_work, wfx_tx_policy_upload_work);

	mutex_init(&wvif->scan_lock);
	init_completion(&wvif->scan_complete);
	INIT_WORK(&wvif->scan_work, wfx_hw_scan_work);

	wfx_tx_queues_init(wvif);
	wfx_tx_policy_init(wvif);

	for (i = 0; i < ARRAY_SIZE(wdev->vif); i++) {
		if (!wdev->vif[i]) {
			wdev->vif[i] = vif;
			wvif->id = i;
			break;
		}
	}
	WARN(i == ARRAY_SIZE(wdev->vif), "try to instantiate more vif than supported");

	hif_set_macaddr(wvif, vif->addr);

	mutex_unlock(&wdev->conf_mutex);

	wvif = NULL;
	while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
		// Combo mode does not support Block Acks. We can re-enable them
		if (wvif_count(wdev) == 1)
			hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
		else
			hif_set_block_ack_policy(wvif, 0x00, 0x00);
	}
	return ret;
}

void wfx_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
	struct wfx_dev *wdev = hw->priv;
	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;

	wait_for_completion_timeout(&wvif->set_pm_mode_complete, msecs_to_jiffies(300));
	wfx_tx_queues_check_empty(wvif);

	mutex_lock(&wdev->conf_mutex);
	WARN(wvif->link_id_map != 1, "corrupted state");

	hif_reset(wvif, false);
	hif_set_macaddr(wvif, NULL);
	wfx_tx_policy_init(wvif);

	cancel_delayed_work_sync(&wvif->beacon_loss_work);
	wdev->vif[wvif->id] = NULL;
	wvif->vif = NULL;

	mutex_unlock(&wdev->conf_mutex);

	wvif = NULL;
	while ((wvif = wvif_iterate(wdev, wvif)) != NULL) {
		// Combo mode does not support Block Acks. We can re-enable them
		if (wvif_count(wdev) == 1)
			hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
		else
			hif_set_block_ack_policy(wvif, 0x00, 0x00);
	}
}

int wfx_start(struct ieee80211_hw *hw)
{
	return 0;
}

void wfx_stop(struct ieee80211_hw *hw)
{
	struct wfx_dev *wdev = hw->priv;

	WARN_ON(!skb_queue_empty_lockless(&wdev->tx_pending));
}