text: /******************************************************************************
   *
   * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
   *
   * Portions of this file are derived from the ipw3945 project, as well
   * as portions of the ieee80211 subsystem header files.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
   *
   * The full GNU General Public License is included in this distribution in the
   * file called LICENSE.
   *
   * Contact Information:
   *  Intel Linux Wireless <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *
   *****************************************************************************/
  #include <linux/etherdevice.h>
  #include <net/mac80211.h>
  #include "iwl-trans.h"
  #include "dev.h"
  #include "agn.h"
  
  const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  
  static int iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  {
  	lockdep_assert_held(&priv->sta_lock);
  
  	if (sta_id >= IWLAGN_STATION_COUNT) {
  		IWL_ERR(priv, "invalid sta_id %u", sta_id);
  		return -EINVAL;
  	}
  	if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  		IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u "
  			"addr %pM\n",
  			sta_id, priv->stations[sta_id].sta.sta.addr);
  
  	if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  		IWL_DEBUG_ASSOC(priv,
  				"STA id %u addr %pM already present in uCode "
  				"(according to driver)\n",
  				sta_id, priv->stations[sta_id].sta.sta.addr);
  	} else {
  		priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  		IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  				sta_id, priv->stations[sta_id].sta.sta.addr);
  	}
  	return 0;
  }
  
  static int iwl_process_add_sta_resp(struct iwl_priv *priv,
  				    struct iwl_addsta_cmd *addsta,
  				    struct iwl_rx_packet *pkt)
  {
  	struct iwl_add_sta_resp *add_sta_resp = (void *)pkt->data;
  	u8 sta_id = addsta->sta.sta_id;
  	int ret = -EIO;
  
  	if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  		IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  			pkt->hdr.flags);
  		return ret;
  	}
  
  	IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  		       sta_id);
  
  	spin_lock(&priv->sta_lock);
  
  	switch (add_sta_resp->status) {
  	case ADD_STA_SUCCESS_MSK:
  		IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  		ret = iwl_sta_ucode_activate(priv, sta_id);
  		break;
  	case ADD_STA_NO_ROOM_IN_TABLE:
  		IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  			sta_id);
  		break;
  	case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  		IWL_ERR(priv, "Adding station %d failed, no block ack "
  			"resource.\n", sta_id);
  		break;
  	case ADD_STA_MODIFY_NON_EXIST_STA:
  		IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  			sta_id);
  		break;
  	default:
  		IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  				add_sta_resp->status);
  		break;
  	}
  
  	IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
  		       priv->stations[sta_id].sta.mode ==
  		       STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
  		       sta_id, priv->stations[sta_id].sta.sta.addr);
  
  	/*
  	 * XXX: The MAC address in the command buffer is often changed from
  	 * the original sent to the device. That is, the MAC address
  	 * written to the command buffer often is not the same MAC address
  	 * read from the command buffer when the command returns. This
  	 * issue has not yet been resolved and this debugging is left to
  	 * observe the problem.
  	 */
  	IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
  		       priv->stations[sta_id].sta.mode ==
  		       STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
  		       addsta->sta.addr);
  	spin_unlock(&priv->sta_lock);
  
  	return ret;
  }
  
  int iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
  			       struct iwl_device_cmd *cmd)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  
  	if (!cmd)
  		return 0;
  
  	return iwl_process_add_sta_resp(priv, (void *)cmd->payload, pkt);
  }
  
  int iwl_send_add_sta(struct iwl_priv *priv,
  		     struct iwl_addsta_cmd *sta, u8 flags)
  {
  	int ret = 0;
  	struct iwl_host_cmd cmd = {
  		.id = REPLY_ADD_STA,
  		.flags = flags,
  		.data = { sta, },
  		.len = { sizeof(*sta), },
  	};
  	u8 sta_id __maybe_unused = sta->sta.sta_id;
  
  	IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
  		       sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
  
  	if (!(flags & CMD_ASYNC)) {
  		cmd.flags |= CMD_WANT_SKB | CMD_WANT_HCMD;
  		might_sleep();
  	}
  
  	ret = iwl_dvm_send_cmd(priv, &cmd);
  
  	if (ret || (flags & CMD_ASYNC))
  		return ret;
  	/*else the command was successfully sent in SYNC mode, need to free
  	 * the reply page */
  
  	iwl_free_resp(&cmd);
  
  	if (cmd.handler_status)
  		IWL_ERR(priv, "%s - error in the CMD response %d", __func__,
  			cmd.handler_status);
  
  	return cmd.handler_status;
  }
  
  bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
  			    struct iwl_rxon_context *ctx,
  			    struct ieee80211_sta_ht_cap *ht_cap)
  {
  	if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
  		return false;
  
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  	if (priv->disable_ht40)
  		return false;
  #endif
  
  	/*
  	 * Remainder of this function checks ht_cap, but if it's
  	 * NULL then we can do HT40 (special case for RXON)
  	 */
  	if (!ht_cap)
  		return true;
  
  	if (!ht_cap->ht_supported)
  		return false;
  
  	if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
  		return false;
  
  	return true;
  }
  
  static void iwl_sta_calc_ht_flags(struct iwl_priv *priv,
  				  struct ieee80211_sta *sta,
  				  struct iwl_rxon_context *ctx,
  				  __le32 *flags, __le32 *mask)
  {
  	struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
  	u8 mimo_ps_mode;
  
  	*mask = STA_FLG_RTS_MIMO_PROT_MSK |
  		STA_FLG_MIMO_DIS_MSK |
  		STA_FLG_HT40_EN_MSK |
  		STA_FLG_MAX_AGG_SIZE_MSK |
  		STA_FLG_AGG_MPDU_DENSITY_MSK;
  	*flags = 0;
  
  	if (!sta || !sta_ht_inf->ht_supported)
  		return;
  
  	mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
  
  	IWL_DEBUG_INFO(priv, "STA %pM SM PS mode: %s\n",
  			sta->addr,
  			(mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
  			"static" :
  			(mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
  			"dynamic" : "disabled");
  
  	switch (mimo_ps_mode) {
  	case WLAN_HT_CAP_SM_PS_STATIC:
  		*flags |= STA_FLG_MIMO_DIS_MSK;
  		break;
  	case WLAN_HT_CAP_SM_PS_DYNAMIC:
  		*flags |= STA_FLG_RTS_MIMO_PROT_MSK;
  		break;
  	case WLAN_HT_CAP_SM_PS_DISABLED:
  		break;
  	default:
  		IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
  		break;
  	}
  
  	*flags |= cpu_to_le32(
  		(u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
  
  	*flags |= cpu_to_le32(
  		(u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
  
  	if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
  		*flags |= STA_FLG_HT40_EN_MSK;
  }
  
  int iwl_sta_update_ht(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  		      struct ieee80211_sta *sta)
  {
  	u8 sta_id = iwl_sta_id(sta);
  	__le32 flags, mask;
  	struct iwl_addsta_cmd cmd;
  
  	if (WARN_ON_ONCE(sta_id == IWL_INVALID_STATION))
  		return -EINVAL;
  
  	iwl_sta_calc_ht_flags(priv, sta, ctx, &flags, &mask);
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].sta.station_flags &= ~mask;
  	priv->stations[sta_id].sta.station_flags |= flags;
  	spin_unlock_bh(&priv->sta_lock);
  
  	memset(&cmd, 0, sizeof(cmd));
  	cmd.mode = STA_CONTROL_MODIFY_MSK;
  	cmd.station_flags_msk = mask;
  	cmd.station_flags = flags;
  	cmd.sta.sta_id = sta_id;
  
  	return iwl_send_add_sta(priv, &cmd, CMD_SYNC);
  }
  
  static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
  				   struct ieee80211_sta *sta,
  				   struct iwl_rxon_context *ctx)
  {
  	__le32 flags, mask;
  
  	iwl_sta_calc_ht_flags(priv, sta, ctx, &flags, &mask);
  
  	lockdep_assert_held(&priv->sta_lock);
  	priv->stations[index].sta.station_flags &= ~mask;
  	priv->stations[index].sta.station_flags |= flags;
  }
  
  /**
   * iwl_prep_station - Prepare station information for addition
   *
   * should be called with sta_lock held
   */
  u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  		    const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
  {
  	struct iwl_station_entry *station;
  	int i;
  	u8 sta_id = IWL_INVALID_STATION;
  
  	if (is_ap)
  		sta_id = ctx->ap_sta_id;
  	else if (is_broadcast_ether_addr(addr))
  		sta_id = ctx->bcast_sta_id;
  	else
  		for (i = IWL_STA_ID; i < IWLAGN_STATION_COUNT; i++) {
  			if (ether_addr_equal(priv->stations[i].sta.sta.addr,
  					     addr)) {
  				sta_id = i;
  				break;
  			}
  
  			if (!priv->stations[i].used &&
  			    sta_id == IWL_INVALID_STATION)
  				sta_id = i;
  		}
  
  	/*
  	 * These two conditions have the same outcome, but keep them
  	 * separate
  	 */
  	if (unlikely(sta_id == IWL_INVALID_STATION))
  		return sta_id;
  
  	/*
  	 * uCode is not able to deal with multiple requests to add a
  	 * station. Keep track if one is in progress so that we do not send
  	 * another.
  	 */
  	if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
  		IWL_DEBUG_INFO(priv, "STA %d already in process of being "
  			       "added.\n", sta_id);
  		return sta_id;
  	}
  
  	if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
  	    (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
  	    ether_addr_equal(priv->stations[sta_id].sta.sta.addr, addr)) {
  		IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
  				"adding again.\n", sta_id, addr);
  		return sta_id;
  	}
  
  	station = &priv->stations[sta_id];
  	station->used = IWL_STA_DRIVER_ACTIVE;
  	IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
  			sta_id, addr);
  	priv->num_stations++;
  
  	/* Set up the REPLY_ADD_STA command to send to device */
  	memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
  	memcpy(station->sta.sta.addr, addr, ETH_ALEN);
  	station->sta.mode = 0;
  	station->sta.sta.sta_id = sta_id;
  	station->sta.station_flags = ctx->station_flags;
  	station->ctxid = ctx->ctxid;
  
  	if (sta) {
  		struct iwl_station_priv *sta_priv;
  
  		sta_priv = (void *)sta->drv_priv;
  		sta_priv->ctx = ctx;
  	}
  
  	/*
  	 * OK to call unconditionally, since local stations (IBSS BSSID
  	 * STA and broadcast STA) pass in a NULL sta, and mac80211
  	 * doesn't allow HT IBSS.
  	 */
  	iwl_set_ht_add_station(priv, sta_id, sta, ctx);
  
  	return sta_id;
  
  }
  
  #define STA_WAIT_TIMEOUT (HZ/2)
  
  /**
   * iwl_add_station_common -
   */
  int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  			   const u8 *addr, bool is_ap,
  			   struct ieee80211_sta *sta, u8 *sta_id_r)
  {
  	int ret = 0;
  	u8 sta_id;
  	struct iwl_addsta_cmd sta_cmd;
  
  	*sta_id_r = 0;
  	spin_lock_bh(&priv->sta_lock);
  	sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
  	if (sta_id == IWL_INVALID_STATION) {
  		IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
  			addr);
  		spin_unlock_bh(&priv->sta_lock);
  		return -EINVAL;
  	}
  
  	/*
  	 * uCode is not able to deal with multiple requests to add a
  	 * station. Keep track if one is in progress so that we do not send
  	 * another.
  	 */
  	if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
  		IWL_DEBUG_INFO(priv, "STA %d already in process of being "
  			       "added.\n", sta_id);
  		spin_unlock_bh(&priv->sta_lock);
  		return -EEXIST;
  	}
  
  	if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
  	    (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
  		IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
  				"adding again.\n", sta_id, addr);
  		spin_unlock_bh(&priv->sta_lock);
  		return -EEXIST;
  	}
  
  	priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta,
  	       sizeof(struct iwl_addsta_cmd));
  	spin_unlock_bh(&priv->sta_lock);
  
  	/* Add station to device's station table */
  	ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  	if (ret) {
  		spin_lock_bh(&priv->sta_lock);
  		IWL_ERR(priv, "Adding station %pM failed.\n",
  			priv->stations[sta_id].sta.sta.addr);
  		priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
  		priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
  		spin_unlock_bh(&priv->sta_lock);
  	}
  	*sta_id_r = sta_id;
  	return ret;
  }
  
  /**
   * iwl_sta_ucode_deactivate - deactivate ucode status for a station
   */
  static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
  {
  	lockdep_assert_held(&priv->sta_lock);
  
  	/* Ucode must be active and driver must be non active */
  	if ((priv->stations[sta_id].used &
  	     (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
  	      IWL_STA_UCODE_ACTIVE)
  		IWL_ERR(priv, "removed non active STA %u\n", sta_id);
  
  	priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
  
  	memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
  	IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
  }
  
  static int iwl_send_remove_station(struct iwl_priv *priv,
  				   const u8 *addr, int sta_id,
  				   bool temporary)
  {
  	struct iwl_rx_packet *pkt;
  	int ret;
  	struct iwl_rem_sta_cmd rm_sta_cmd;
  
  	struct iwl_host_cmd cmd = {
  		.id = REPLY_REMOVE_STA,
  		.len = { sizeof(struct iwl_rem_sta_cmd), },
  		.flags = CMD_SYNC,
  		.data = { &rm_sta_cmd, },
  	};
  
  	memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
  	rm_sta_cmd.num_sta = 1;
  	memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
  
  	cmd.flags |= CMD_WANT_SKB;
  
  	ret = iwl_dvm_send_cmd(priv, &cmd);
  
  	if (ret)
  		return ret;
  
  	pkt = cmd.resp_pkt;
  	if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  		IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
  			  pkt->hdr.flags);
  		ret = -EIO;
  	}
  
  	if (!ret) {
  		struct iwl_rem_sta_resp *rem_sta_resp = (void *)pkt->data;
  		switch (rem_sta_resp->status) {
  		case REM_STA_SUCCESS_MSK:
  			if (!temporary) {
  				spin_lock_bh(&priv->sta_lock);
  				iwl_sta_ucode_deactivate(priv, sta_id);
  				spin_unlock_bh(&priv->sta_lock);
  			}
  			IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
  			break;
  		default:
  			ret = -EIO;
  			IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
  			break;
  		}
  	}
  	iwl_free_resp(&cmd);
  
  	return ret;
  }
  
  /**
   * iwl_remove_station - Remove driver's knowledge of station.
   */
  int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
  		       const u8 *addr)
  {
  	u8 tid;
  
  	if (!iwl_is_ready(priv)) {
  		IWL_DEBUG_INFO(priv,
  			"Unable to remove station %pM, device not ready.\n",
  			addr);
  		/*
  		 * It is typical for stations to be removed when we are
  		 * going down. Return success since device will be down
  		 * soon anyway
  		 */
  		return 0;
  	}
  
  	IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
  			sta_id, addr);
  
  	if (WARN_ON(sta_id == IWL_INVALID_STATION))
  		return -EINVAL;
  
  	spin_lock_bh(&priv->sta_lock);
  
  	if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
  		IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
  				addr);
  		goto out_err;
  	}
  
  	if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
  		IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
  				addr);
  		goto out_err;
  	}
  
  	if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
  		kfree(priv->stations[sta_id].lq);
  		priv->stations[sta_id].lq = NULL;
  	}
  
  	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
  		memset(&priv->tid_data[sta_id][tid], 0,
  			sizeof(priv->tid_data[sta_id][tid]));
  
  	priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
  
  	priv->num_stations--;
  
  	if (WARN_ON(priv->num_stations < 0))
  		priv->num_stations = 0;
  
  	spin_unlock_bh(&priv->sta_lock);
  
  	return iwl_send_remove_station(priv, addr, sta_id, false);
  out_err:
  	spin_unlock_bh(&priv->sta_lock);
  	return -EINVAL;
  }
  
  void iwl_deactivate_station(struct iwl_priv *priv, const u8 sta_id,
  			    const u8 *addr)
  {
  	u8 tid;
  
  	if (!iwl_is_ready(priv)) {
  		IWL_DEBUG_INFO(priv,
  			"Unable to remove station %pM, device not ready.\n",
  			addr);
  		return;
  	}
  
  	IWL_DEBUG_ASSOC(priv, "Deactivating STA: %pM (%d)\n", addr, sta_id);
  
  	if (WARN_ON_ONCE(sta_id == IWL_INVALID_STATION))
  		return;
  
  	spin_lock_bh(&priv->sta_lock);
  
  	WARN_ON_ONCE(!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE));
  
  	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
  		memset(&priv->tid_data[sta_id][tid], 0,
  			sizeof(priv->tid_data[sta_id][tid]));
  
  	priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
  
  	priv->num_stations--;
  
  	if (WARN_ON_ONCE(priv->num_stations < 0))
  		priv->num_stations = 0;
  
  	spin_unlock_bh(&priv->sta_lock);
  }
  
  static void iwl_sta_fill_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  			    u8 sta_id, struct iwl_link_quality_cmd *link_cmd)
  {
  	int i, r;
  	u32 rate_flags = 0;
  	__le32 rate_n_flags;
  
  	lockdep_assert_held(&priv->mutex);
  
  	memset(link_cmd, 0, sizeof(*link_cmd));
  
  	/* Set up the rate scaling to start at selected rate, fall back
  	 * all the way down to 1M in IEEE order, and then spin on 1M */
  	if (priv->band == IEEE80211_BAND_5GHZ)
  		r = IWL_RATE_6M_INDEX;
  	else if (ctx && ctx->vif && ctx->vif->p2p)
  		r = IWL_RATE_6M_INDEX;
  	else
  		r = IWL_RATE_1M_INDEX;
  
  	if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
  		rate_flags |= RATE_MCS_CCK_MSK;
  
  	rate_flags |= first_antenna(priv->eeprom_data->valid_tx_ant) <<
  				RATE_MCS_ANT_POS;
  	rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
  	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
  		link_cmd->rs_table[i].rate_n_flags = rate_n_flags;
  
  	link_cmd->general_params.single_stream_ant_msk =
  			first_antenna(priv->eeprom_data->valid_tx_ant);
  
  	link_cmd->general_params.dual_stream_ant_msk =
  		priv->eeprom_data->valid_tx_ant &
  		~first_antenna(priv->eeprom_data->valid_tx_ant);
  	if (!link_cmd->general_params.dual_stream_ant_msk) {
  		link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
  	} else if (num_of_ant(priv->eeprom_data->valid_tx_ant) == 2) {
  		link_cmd->general_params.dual_stream_ant_msk =
  			priv->eeprom_data->valid_tx_ant;
  	}
  
  	link_cmd->agg_params.agg_dis_start_th =
  		LINK_QUAL_AGG_DISABLE_START_DEF;
  	link_cmd->agg_params.agg_time_limit =
  		cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
  
  	link_cmd->sta_id = sta_id;
  }
  
  /**
   * iwl_clear_ucode_stations - clear ucode station table bits
   *
   * This function clears all the bits in the driver indicating
   * which stations are active in the ucode. Call when something
   * other than explicit station management would cause this in
   * the ucode, e.g. unassociated RXON.
   */
  void iwl_clear_ucode_stations(struct iwl_priv *priv,
  			      struct iwl_rxon_context *ctx)
  {
  	int i;
  	bool cleared = false;
  
  	IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
  
  	spin_lock_bh(&priv->sta_lock);
  	for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
  		if (ctx && ctx->ctxid != priv->stations[i].ctxid)
  			continue;
  
  		if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
  			IWL_DEBUG_INFO(priv,
  				"Clearing ucode active for station %d\n", i);
  			priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
  			cleared = true;
  		}
  	}
  	spin_unlock_bh(&priv->sta_lock);
  
  	if (!cleared)
  		IWL_DEBUG_INFO(priv,
  			       "No active stations found to be cleared\n");
  }
  
  /**
   * iwl_restore_stations() - Restore driver known stations to device
   *
   * All stations considered active by driver, but not present in ucode, is
   * restored.
   *
   * Function sleeps.
   */
  void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
  {
  	struct iwl_addsta_cmd sta_cmd;
  	struct iwl_link_quality_cmd lq;
  	int i;
  	bool found = false;
  	int ret;
  	bool send_lq;
  
  	if (!iwl_is_ready(priv)) {
  		IWL_DEBUG_INFO(priv,
  			       "Not ready yet, not restoring any stations.\n");
  		return;
  	}
  
  	IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
  	spin_lock_bh(&priv->sta_lock);
  	for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
  		if (ctx->ctxid != priv->stations[i].ctxid)
  			continue;
  		if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
  			    !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
  			IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
  					priv->stations[i].sta.sta.addr);
  			priv->stations[i].sta.mode = 0;
  			priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
  			found = true;
  		}
  	}
  
  	for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
  		if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
  			memcpy(&sta_cmd, &priv->stations[i].sta,
  			       sizeof(struct iwl_addsta_cmd));
  			send_lq = false;
  			if (priv->stations[i].lq) {
  				if (priv->wowlan)
  					iwl_sta_fill_lq(priv, ctx, i, &lq);
  				else
  					memcpy(&lq, priv->stations[i].lq,
  					       sizeof(struct iwl_link_quality_cmd));
  				send_lq = true;
  			}
  			spin_unlock_bh(&priv->sta_lock);
  			ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  			if (ret) {
  				spin_lock_bh(&priv->sta_lock);
  				IWL_ERR(priv, "Adding station %pM failed.\n",
  					priv->stations[i].sta.sta.addr);
  				priv->stations[i].used &=
  						~IWL_STA_DRIVER_ACTIVE;
  				priv->stations[i].used &=
  						~IWL_STA_UCODE_INPROGRESS;
  				continue;
  			}
  			/*
  			 * Rate scaling has already been initialized, send
  			 * current LQ command
  			 */
  			if (send_lq)
  				iwl_send_lq_cmd(priv, ctx, &lq,
  						CMD_SYNC, true);
  			spin_lock_bh(&priv->sta_lock);
  			priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
  		}
  	}
  
  	spin_unlock_bh(&priv->sta_lock);
  	if (!found)
  		IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
  			"no stations to be restored.\n");
  	else
  		IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
  			"complete.\n");
  }
  
  int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
  {
  	int i;
  
  	for (i = 0; i < priv->sta_key_max_num; i++)
  		if (!test_and_set_bit(i, &priv->ucode_key_table))
  			return i;
  
  	return WEP_INVALID_OFFSET;
  }
  
  void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
  {
  	int i;
  
  	spin_lock_bh(&priv->sta_lock);
  	for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
  		if (!(priv->stations[i].used & IWL_STA_BCAST))
  			continue;
  
  		priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
  		priv->num_stations--;
  		if (WARN_ON(priv->num_stations < 0))
  			priv->num_stations = 0;
  		kfree(priv->stations[i].lq);
  		priv->stations[i].lq = NULL;
  	}
  	spin_unlock_bh(&priv->sta_lock);
  }
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  static void iwl_dump_lq_cmd(struct iwl_priv *priv,
  			   struct iwl_link_quality_cmd *lq)
  {
  	int i;
  	IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
  	IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
  		       lq->general_params.single_stream_ant_msk,
  		       lq->general_params.dual_stream_ant_msk);
  
  	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
  		IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
  			       i, lq->rs_table[i].rate_n_flags);
  }
  #else
  static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
  				   struct iwl_link_quality_cmd *lq)
  {
  }
  #endif
  
  /**
   * is_lq_table_valid() - Test one aspect of LQ cmd for validity
   *
   * It sometimes happens when a HT rate has been in use and we
   * loose connectivity with AP then mac80211 will first tell us that the
   * current channel is not HT anymore before removing the station. In such a
   * scenario the RXON flags will be updated to indicate we are not
   * communicating HT anymore, but the LQ command may still contain HT rates.
   * Test for this to prevent driver from sending LQ command between the time
   * RXON flags are updated and when LQ command is updated.
   */
  static bool is_lq_table_valid(struct iwl_priv *priv,
  			      struct iwl_rxon_context *ctx,
  			      struct iwl_link_quality_cmd *lq)
  {
  	int i;
  
  	if (ctx->ht.enabled)
  		return true;
  
  	IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
  		       ctx->active.channel);
  	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
  		if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
  		    RATE_MCS_HT_MSK) {
  			IWL_DEBUG_INFO(priv,
  				       "index %d of LQ expects HT channel\n",
  				       i);
  			return false;
  		}
  	}
  	return true;
  }
  
  /**
   * iwl_send_lq_cmd() - Send link quality command
   * @init: This command is sent as part of station initialization right
   *        after station has been added.
   *
   * The link quality command is sent as the last step of station creation.
   * This is the special case in which init is set and we call a callback in
   * this case to clear the state indicating that station creation is in
   * progress.
   */
  int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  		    struct iwl_link_quality_cmd *lq, u8 flags, bool init)
  {
  	int ret = 0;
  	struct iwl_host_cmd cmd = {
  		.id = REPLY_TX_LINK_QUALITY_CMD,
  		.len = { sizeof(struct iwl_link_quality_cmd), },
  		.flags = flags,
  		.data = { lq, },
  	};
  
  	if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
  		return -EINVAL;
  
  
  	spin_lock_bh(&priv->sta_lock);
  	if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
  		spin_unlock_bh(&priv->sta_lock);
  		return -EINVAL;
  	}
  	spin_unlock_bh(&priv->sta_lock);
  
  	iwl_dump_lq_cmd(priv, lq);
  	if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
  		return -EINVAL;
  
  	if (is_lq_table_valid(priv, ctx, lq))
  		ret = iwl_dvm_send_cmd(priv, &cmd);
  	else
  		ret = -EINVAL;
  
  	if (cmd.flags & CMD_ASYNC)
  		return ret;
  
  	if (init) {
  		IWL_DEBUG_INFO(priv, "init LQ command complete, "
  			       "clearing sta addition status for sta %d\n",
  			       lq->sta_id);
  		spin_lock_bh(&priv->sta_lock);
  		priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
  		spin_unlock_bh(&priv->sta_lock);
  	}
  	return ret;
  }
  
  
  static struct iwl_link_quality_cmd *
  iwl_sta_alloc_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
  		 u8 sta_id)
  {
  	struct iwl_link_quality_cmd *link_cmd;
  
  	link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
  	if (!link_cmd) {
  		IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
  		return NULL;
  	}
  
  	iwl_sta_fill_lq(priv, ctx, sta_id, link_cmd);
  
  	return link_cmd;
  }
  
  /*
   * iwlagn_add_bssid_station - Add the special IBSS BSSID station
   *
   * Function sleeps.
   */
  int iwlagn_add_bssid_station(struct iwl_priv *priv,
  			     struct iwl_rxon_context *ctx,
  			     const u8 *addr, u8 *sta_id_r)
  {
  	int ret;
  	u8 sta_id;
  	struct iwl_link_quality_cmd *link_cmd;
  
  	if (sta_id_r)
  		*sta_id_r = IWL_INVALID_STATION;
  
  	ret = iwl_add_station_common(priv, ctx, addr, 0, NULL, &sta_id);
  	if (ret) {
  		IWL_ERR(priv, "Unable to add station %pM\n", addr);
  		return ret;
  	}
  
  	if (sta_id_r)
  		*sta_id_r = sta_id;
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].used |= IWL_STA_LOCAL;
  	spin_unlock_bh(&priv->sta_lock);
  
  	/* Set up default rate scaling table in device's station table */
  	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
  	if (!link_cmd) {
  		IWL_ERR(priv,
  			"Unable to initialize rate scaling for station %pM.\n",
  			addr);
  		return -ENOMEM;
  	}
  
  	ret = iwl_send_lq_cmd(priv, ctx, link_cmd, CMD_SYNC, true);
  	if (ret)
  		IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].lq = link_cmd;
  	spin_unlock_bh(&priv->sta_lock);
  
  	return 0;
  }
  
  /*
   * static WEP keys
   *
   * For each context, the device has a table of 4 static WEP keys
   * (one for each key index) that is updated with the following
   * commands.
   */
  
  static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv,
  				      struct iwl_rxon_context *ctx,
  				      bool send_if_empty)
  {
  	int i, not_empty = 0;
  	u8 buff[sizeof(struct iwl_wep_cmd) +
  		sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
  	struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
  	size_t cmd_size  = sizeof(struct iwl_wep_cmd);
  	struct iwl_host_cmd cmd = {
  		.id = ctx->wep_key_cmd,
  		.data = { wep_cmd, },
  		.flags = CMD_SYNC,
  	};
  
  	might_sleep();
  
  	memset(wep_cmd, 0, cmd_size +
  			(sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
  
  	for (i = 0; i < WEP_KEYS_MAX ; i++) {
  		wep_cmd->key[i].key_index = i;
  		if (ctx->wep_keys[i].key_size) {
  			wep_cmd->key[i].key_offset = i;
  			not_empty = 1;
  		} else {
  			wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
  		}
  
  		wep_cmd->key[i].key_size = ctx->wep_keys[i].key_size;
  		memcpy(&wep_cmd->key[i].key[3], ctx->wep_keys[i].key,
  				ctx->wep_keys[i].key_size);
  	}
  
  	wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
  	wep_cmd->num_keys = WEP_KEYS_MAX;
  
  	cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
  
  	cmd.len[0] = cmd_size;
  
  	if (not_empty || send_if_empty)
  		return iwl_dvm_send_cmd(priv, &cmd);
  	else
  		return 0;
  }
  
  int iwl_restore_default_wep_keys(struct iwl_priv *priv,
  				 struct iwl_rxon_context *ctx)
  {
  	lockdep_assert_held(&priv->mutex);
  
  	return iwl_send_static_wepkey_cmd(priv, ctx, false);
  }
  
  int iwl_remove_default_wep_key(struct iwl_priv *priv,
  			       struct iwl_rxon_context *ctx,
  			       struct ieee80211_key_conf *keyconf)
  {
  	int ret;
  
  	lockdep_assert_held(&priv->mutex);
  
  	IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
  		      keyconf->keyidx);
  
  	memset(&ctx->wep_keys[keyconf->keyidx], 0, sizeof(ctx->wep_keys[0]));
  	if (iwl_is_rfkill(priv)) {
  		IWL_DEBUG_WEP(priv,
  			"Not sending REPLY_WEPKEY command due to RFKILL.\n");
  		/* but keys in device are clear anyway so return success */
  		return 0;
  	}
  	ret = iwl_send_static_wepkey_cmd(priv, ctx, 1);
  	IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
  		      keyconf->keyidx, ret);
  
  	return ret;
  }
  
  int iwl_set_default_wep_key(struct iwl_priv *priv,
  			    struct iwl_rxon_context *ctx,
  			    struct ieee80211_key_conf *keyconf)
  {
  	int ret;
  
  	lockdep_assert_held(&priv->mutex);
  
  	if (keyconf->keylen != WEP_KEY_LEN_128 &&
  	    keyconf->keylen != WEP_KEY_LEN_64) {
  		IWL_DEBUG_WEP(priv,
  			      "Bad WEP key length %d\n", keyconf->keylen);
  		return -EINVAL;
  	}
  
  	keyconf->hw_key_idx = IWLAGN_HW_KEY_DEFAULT;
  
  	ctx->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
  	memcpy(&ctx->wep_keys[keyconf->keyidx].key, &keyconf->key,
  							keyconf->keylen);
  
  	ret = iwl_send_static_wepkey_cmd(priv, ctx, false);
  	IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
  		keyconf->keylen, keyconf->keyidx, ret);
  
  	return ret;
  }
  
  /*
   * dynamic (per-station) keys
   *
   * The dynamic keys are a little more complicated. The device has
   * a key cache of up to STA_KEY_MAX_NUM/STA_KEY_MAX_NUM_PAN keys.
   * These are linked to stations by a table that contains an index
   * into the key table for each station/key index/{mcast,unicast},
   * i.e. it's basically an array of pointers like this:
   *	key_offset_t key_mapping[NUM_STATIONS][4][2];
   * (it really works differently, but you can think of it as such)
   *
   * The key uploading and linking happens in the same command, the
   * add station command with STA_MODIFY_KEY_MASK.
   */
  
  static u8 iwlagn_key_sta_id(struct iwl_priv *priv,
  			    struct ieee80211_vif *vif,
  			    struct ieee80211_sta *sta)
  {
  	struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
  
  	if (sta)
  		return iwl_sta_id(sta);
  
  	/*
  	 * The device expects GTKs for station interfaces to be
  	 * installed as GTKs for the AP station. If we have no
  	 * station ID, then use the ap_sta_id in that case.
  	 */
  	if (vif->type == NL80211_IFTYPE_STATION && vif_priv->ctx)
  		return vif_priv->ctx->ap_sta_id;
  
  	return IWL_INVALID_STATION;
  }
  
  static int iwlagn_send_sta_key(struct iwl_priv *priv,
  			       struct ieee80211_key_conf *keyconf,
  			       u8 sta_id, u32 tkip_iv32, u16 *tkip_p1k,
  			       u32 cmd_flags)
  {
  	__le16 key_flags;
  	struct iwl_addsta_cmd sta_cmd;
  	int i;
  
  	spin_lock_bh(&priv->sta_lock);
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
  	spin_unlock_bh(&priv->sta_lock);
  
  	key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
  	key_flags |= STA_KEY_FLG_MAP_KEY_MSK;
  
  	switch (keyconf->cipher) {
  	case WLAN_CIPHER_SUITE_CCMP:
  		key_flags |= STA_KEY_FLG_CCMP;
  		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
  		break;
  	case WLAN_CIPHER_SUITE_TKIP:
  		key_flags |= STA_KEY_FLG_TKIP;
  		sta_cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
  		for (i = 0; i < 5; i++)
  			sta_cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
  		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
  		break;
  	case WLAN_CIPHER_SUITE_WEP104:
  		key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
  		/* fall through */
  	case WLAN_CIPHER_SUITE_WEP40:
  		key_flags |= STA_KEY_FLG_WEP;
  		memcpy(&sta_cmd.key.key[3], keyconf->key, keyconf->keylen);
  		break;
  	default:
  		WARN_ON(1);
  		return -EINVAL;
  	}
  
  	if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
  		key_flags |= STA_KEY_MULTICAST_MSK;
  
  	/* key pointer (offset) */
  	sta_cmd.key.key_offset = keyconf->hw_key_idx;
  
  	sta_cmd.key.key_flags = key_flags;
  	sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
  	sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
  
  	return iwl_send_add_sta(priv, &sta_cmd, cmd_flags);
  }
  
  void iwl_update_tkip_key(struct iwl_priv *priv,
  			 struct ieee80211_vif *vif,
  			 struct ieee80211_key_conf *keyconf,
  			 struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
  {
  	u8 sta_id = iwlagn_key_sta_id(priv, vif, sta);
  
  	if (sta_id == IWL_INVALID_STATION)
  		return;
  
  	if (iwl_scan_cancel(priv)) {
  		/* cancel scan failed, just live w/ bad key and rely
  		   briefly on SW decryption */
  		return;
  	}
  
  	iwlagn_send_sta_key(priv, keyconf, sta_id,
  			    iv32, phase1key, CMD_ASYNC);
  }
  
  int iwl_remove_dynamic_key(struct iwl_priv *priv,
  			   struct iwl_rxon_context *ctx,
  			   struct ieee80211_key_conf *keyconf,
  			   struct ieee80211_sta *sta)
  {
  	struct iwl_addsta_cmd sta_cmd;
  	u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
  	__le16 key_flags;
  
  	/* if station isn't there, neither is the key */
  	if (sta_id == IWL_INVALID_STATION)
  		return -ENOENT;
  
  	spin_lock_bh(&priv->sta_lock);
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
  	if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE))
  		sta_id = IWL_INVALID_STATION;
  	spin_unlock_bh(&priv->sta_lock);
  
  	if (sta_id == IWL_INVALID_STATION)
  		return 0;
  
  	lockdep_assert_held(&priv->mutex);
  
  	ctx->key_mapping_keys--;
  
  	IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
  		      keyconf->keyidx, sta_id);
  
  	if (!test_and_clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table))
  		IWL_ERR(priv, "offset %d not used in uCode key table.\n",
  			keyconf->hw_key_idx);
  
  	key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
  	key_flags |= STA_KEY_FLG_MAP_KEY_MSK | STA_KEY_FLG_NO_ENC |
  		     STA_KEY_FLG_INVALID;
  
  	if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
  		key_flags |= STA_KEY_MULTICAST_MSK;
  
  	sta_cmd.key.key_flags = key_flags;
  	sta_cmd.key.key_offset = keyconf->hw_key_idx;
  	sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
  	sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
  
  	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  }
  
  int iwl_set_dynamic_key(struct iwl_priv *priv,
  			struct iwl_rxon_context *ctx,
  			struct ieee80211_key_conf *keyconf,
  			struct ieee80211_sta *sta)
  {
  	struct ieee80211_key_seq seq;
  	u16 p1k[5];
  	int ret;
  	u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
  	const u8 *addr;
  
  	if (sta_id == IWL_INVALID_STATION)
  		return -EINVAL;
  
  	lockdep_assert_held(&priv->mutex);
  
  	keyconf->hw_key_idx = iwl_get_free_ucode_key_offset(priv);
  	if (keyconf->hw_key_idx == WEP_INVALID_OFFSET)
  		return -ENOSPC;
  
  	ctx->key_mapping_keys++;
  
  	switch (keyconf->cipher) {
  	case WLAN_CIPHER_SUITE_TKIP:
  		if (sta)
  			addr = sta->addr;
  		else /* station mode case only */
  			addr = ctx->active.bssid_addr;
  
  		/* pre-fill phase 1 key into device cache */
  		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
  		ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
  		ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
  					  seq.tkip.iv32, p1k, CMD_SYNC);
  		break;
  	case WLAN_CIPHER_SUITE_CCMP:
  	case WLAN_CIPHER_SUITE_WEP40:
  	case WLAN_CIPHER_SUITE_WEP104:
  		ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
  					  0, NULL, CMD_SYNC);
  		break;
  	default:
  		IWL_ERR(priv, "Unknown cipher %x\n", keyconf->cipher);
  		ret = -EINVAL;
  	}
  
  	if (ret) {
  		ctx->key_mapping_keys--;
  		clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table);
  	}
  
  	IWL_DEBUG_WEP(priv, "Set dynamic key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
  		      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
  		      sta ? sta->addr : NULL, ret);
  
  	return ret;
  }
  
  /**
   * iwlagn_alloc_bcast_station - add broadcast station into driver's station table.
   *
   * This adds the broadcast station into the driver's station table
   * and marks it driver active, so that it will be restored to the
   * device at the next best time.
   */
  int iwlagn_alloc_bcast_station(struct iwl_priv *priv,
  			       struct iwl_rxon_context *ctx)
  {
  	struct iwl_link_quality_cmd *link_cmd;
  	u8 sta_id;
  
  	spin_lock_bh(&priv->sta_lock);
  	sta_id = iwl_prep_station(priv, ctx, iwl_bcast_addr, false, NULL);
  	if (sta_id == IWL_INVALID_STATION) {
  		IWL_ERR(priv, "Unable to prepare broadcast station\n");
  		spin_unlock_bh(&priv->sta_lock);
  
  		return -EINVAL;
  	}
  
  	priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
  	priv->stations[sta_id].used |= IWL_STA_BCAST;
  	spin_unlock_bh(&priv->sta_lock);
  
  	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
  	if (!link_cmd) {
  		IWL_ERR(priv,
  			"Unable to initialize rate scaling for bcast station.\n");
  		return -ENOMEM;
  	}
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].lq = link_cmd;
  	spin_unlock_bh(&priv->sta_lock);
  
  	return 0;
  }
  
  /**
   * iwl_update_bcast_station - update broadcast station's LQ command
   *
   * Only used by iwlagn. Placed here to have all bcast station management
   * code together.
   */
  int iwl_update_bcast_station(struct iwl_priv *priv,
  			     struct iwl_rxon_context *ctx)
  {
  	struct iwl_link_quality_cmd *link_cmd;
  	u8 sta_id = ctx->bcast_sta_id;
  
  	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
  	if (!link_cmd) {
  		IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
  		return -ENOMEM;
  	}
  
  	spin_lock_bh(&priv->sta_lock);
  	if (priv->stations[sta_id].lq)
  		kfree(priv->stations[sta_id].lq);
  	else
  		IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
  	priv->stations[sta_id].lq = link_cmd;
  	spin_unlock_bh(&priv->sta_lock);
  
  	return 0;
  }
  
  int iwl_update_bcast_stations(struct iwl_priv *priv)
  {
  	struct iwl_rxon_context *ctx;
  	int ret = 0;
  
  	for_each_context(priv, ctx) {
  		ret = iwl_update_bcast_station(priv, ctx);
  		if (ret)
  			break;
  	}
  
  	return ret;
  }
  
  /**
   * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
   */
  int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
  {
  	struct iwl_addsta_cmd sta_cmd;
  
  	lockdep_assert_held(&priv->mutex);
  
  	/* Remove "disable" flag, to enable Tx for this TID */
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
  	priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
  	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
  	spin_unlock_bh(&priv->sta_lock);
  
  	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  }
  
  int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
  			 int tid, u16 ssn)
  {
  	int sta_id;
  	struct iwl_addsta_cmd sta_cmd;
  
  	lockdep_assert_held(&priv->mutex);
  
  	sta_id = iwl_sta_id(sta);
  	if (sta_id == IWL_INVALID_STATION)
  		return -ENXIO;
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].sta.station_flags_msk = 0;
  	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
  	priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
  	priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
  	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
  	spin_unlock_bh(&priv->sta_lock);
  
  	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  }
  
  int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
  			int tid)
  {
  	int sta_id;
  	struct iwl_addsta_cmd sta_cmd;
  
  	lockdep_assert_held(&priv->mutex);
  
  	sta_id = iwl_sta_id(sta);
  	if (sta_id == IWL_INVALID_STATION) {
  		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
  		return -ENXIO;
  	}
  
  	spin_lock_bh(&priv->sta_lock);
  	priv->stations[sta_id].sta.station_flags_msk = 0;
  	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
  	priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
  	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
  	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
  	spin_unlock_bh(&priv->sta_lock);
  
  	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
  }
  
  
  
  void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
  {
  	struct iwl_addsta_cmd cmd = {
  		.mode = STA_CONTROL_MODIFY_MSK,
  		.station_flags = STA_FLG_PWR_SAVE_MSK,
  		.station_flags_msk = STA_FLG_PWR_SAVE_MSK,
  		.sta.sta_id = sta_id,
  		.sta.modify_mask = STA_MODIFY_SLEEP_TX_COUNT_MSK,
  		.sleep_tx_count = cpu_to_le16(cnt),
  	};
  
  	iwl_send_add_sta(priv, &cmd, CMD_ASYNC);
  }
  