Commit 2b20920d authored by Stanislaw Gruszka's avatar Stanislaw Gruszka Committed by John W. Linville
Browse files

iwlegacy: remove iwl-sta.c 



I forgot to remove this file before.

Signed-off-by: default avatarStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent f6e8cb72

drivers/net/wireless/iwlegacy/iwl-sta.c

deleted100644 → 0
+0 −817
Original line number Diff line number Diff line 
/******************************************************************************

 *

 * Copyright(c) 2003 - 2011 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 <net/mac80211.h>

#include <linux/etherdevice.h>

#include <linux/sched.h>

#include <linux/lockdep.h>

#include <linux/export.h>



#include "iwl-dev.h"

#include "iwl-core.h"

#include "iwl-sta.h"



/* il->sta_lock must be held */

static void il_sta_ucode_activate(struct il_priv *il, u8 sta_id)

{



	if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))

		IL_ERR(

			"ACTIVATE a non DRIVER active station id %u addr %pM\n",

			sta_id, il->stations[sta_id].sta.sta.addr);



	if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {

		D_ASSOC(

			"STA id %u addr %pM already present"

			" in uCode (according to driver)\n",

			sta_id, il->stations[sta_id].sta.sta.addr);

	} else {

		il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;

		D_ASSOC("Added STA id %u addr %pM to uCode\n",

				sta_id, il->stations[sta_id].sta.sta.addr);

	}

}



static int il_process_add_sta_resp(struct il_priv *il,

				    struct il_addsta_cmd *addsta,

				    struct il_rx_pkt *pkt,

				    bool sync)

{

	u8 sta_id = addsta->sta.sta_id;

	unsigned long flags;

	int ret = -EIO;



	if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {

		IL_ERR("Bad return from C_ADD_STA (0x%08X)\n",

			pkt->hdr.flags);

		return ret;

	}



	D_INFO("Processing response for adding station %u\n",

		       sta_id);



	spin_lock_irqsave(&il->sta_lock, flags);



	switch (pkt->u.add_sta.status) {

	case ADD_STA_SUCCESS_MSK:

		D_INFO("C_ADD_STA PASSED\n");

		il_sta_ucode_activate(il, sta_id);

		ret = 0;

		break;

	case ADD_STA_NO_ROOM_IN_TBL:

		IL_ERR("Adding station %d failed, no room in table.\n",

			sta_id);

		break;

	case ADD_STA_NO_BLOCK_ACK_RESOURCE:

		IL_ERR(

			"Adding station %d failed, no block ack resource.\n",

			sta_id);

		break;

	case ADD_STA_MODIFY_NON_EXIST_STA:

		IL_ERR("Attempting to modify non-existing station %d\n",

			sta_id);

		break;

	default:

		D_ASSOC("Received C_ADD_STA:(0x%08X)\n",

				pkt->u.add_sta.status);

		break;

	}



	D_INFO("%s station id %u addr %pM\n",

		       il->stations[sta_id].sta.mode ==

		       STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",

		       sta_id, il->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.

	 */

	D_INFO("%s station according to cmd buffer %pM\n",

		       il->stations[sta_id].sta.mode ==

		       STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",

		       addsta->sta.addr);

	spin_unlock_irqrestore(&il->sta_lock, flags);



	return ret;

}



static void il_add_sta_callback(struct il_priv *il,

				 struct il_device_cmd *cmd,

				 struct il_rx_pkt *pkt)

{

	struct il_addsta_cmd *addsta =

		(struct il_addsta_cmd *)cmd->cmd.payload;



	il_process_add_sta_resp(il, addsta, pkt, false);



}



int il_send_add_sta(struct il_priv *il,

		     struct il_addsta_cmd *sta, u8 flags)

{

	struct il_rx_pkt *pkt = NULL;

	int ret = 0;

	u8 data[sizeof(*sta)];

	struct il_host_cmd cmd = {

		.id = C_ADD_STA,

		.flags = flags,

		.data = data,

	};

	u8 sta_id __maybe_unused = sta->sta.sta_id;



	D_INFO("Adding sta %u (%pM) %ssynchronously\n",

		       sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");



	if (flags & CMD_ASYNC)

		cmd.callback = il_add_sta_callback;

	else {

		cmd.flags |= CMD_WANT_SKB;

		might_sleep();

	}



	cmd.len = il->cfg->ops->utils->build_addsta_hcmd(sta, data);

	ret = il_send_cmd(il, &cmd);



	if (ret || (flags & CMD_ASYNC))

		return ret;



	if (ret == 0) {

		pkt = (struct il_rx_pkt *)cmd.reply_page;

		ret = il_process_add_sta_resp(il, sta, pkt, true);

	}

	il_free_pages(il, cmd.reply_page);



	return ret;

}

EXPORT_SYMBOL(il_send_add_sta);



static void il_set_ht_add_station(struct il_priv *il, u8 idx,

				   struct ieee80211_sta *sta,

				   struct il_rxon_context *ctx)

{

	struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;

	__le32 sta_flags;

	u8 mimo_ps_mode;



	if (!sta || !sta_ht_inf->ht_supported)

		goto done;



	mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;

	D_ASSOC("spatial multiplexing power save mode: %s\n",

			(mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?

			"static" :

			(mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?

			"dynamic" : "disabled");



	sta_flags = il->stations[idx].sta.station_flags;



	sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);



	switch (mimo_ps_mode) {

	case WLAN_HT_CAP_SM_PS_STATIC:

		sta_flags |= STA_FLG_MIMO_DIS_MSK;

		break;

	case WLAN_HT_CAP_SM_PS_DYNAMIC:

		sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;

		break;

	case WLAN_HT_CAP_SM_PS_DISABLED:

		break;

	default:

		IL_WARN("Invalid MIMO PS mode %d\n", mimo_ps_mode);

		break;

	}



	sta_flags |= cpu_to_le32(

	      (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);



	sta_flags |= cpu_to_le32(

	      (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);



	if (il_is_ht40_tx_allowed(il, ctx, &sta->ht_cap))

		sta_flags |= STA_FLG_HT40_EN_MSK;

	else

		sta_flags &= ~STA_FLG_HT40_EN_MSK;



	il->stations[idx].sta.station_flags = sta_flags;

 done:

	return;

}



/**

 * il_prep_station - Prepare station information for addition

 *

 * should be called with sta_lock held

 */

u8 il_prep_station(struct il_priv *il, struct il_rxon_context *ctx,

		    const u8 *addr, bool is_ap, struct ieee80211_sta *sta)

{

	struct il_station_entry *station;

	int i;

	u8 sta_id = IL_INVALID_STATION;

	u16 rate;



	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 = IL_STA_ID; i < il->hw_params.max_stations; i++) {

			if (!compare_ether_addr(il->stations[i].sta.sta.addr,

						addr)) {

				sta_id = i;

				break;

			}



			if (!il->stations[i].used &&

			    sta_id == IL_INVALID_STATION)

				sta_id = i;

		}



	/*

	 * These two conditions have the same outcome, but keep them

	 * separate

	 */

	if (unlikely(sta_id == IL_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 (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {

		D_INFO(

				"STA %d already in process of being added.\n",

				sta_id);

		return sta_id;

	}



	if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&

	    (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&

	    !compare_ether_addr(il->stations[sta_id].sta.sta.addr, addr)) {

		D_ASSOC(

				"STA %d (%pM) already added, not adding again.\n",

				sta_id, addr);

		return sta_id;

	}



	station = &il->stations[sta_id];

	station->used = IL_STA_DRIVER_ACTIVE;

	D_ASSOC("Add STA to driver ID %d: %pM\n",

			sta_id, addr);

	il->num_stations++;



	/* Set up the C_ADD_STA command to send to device */

	memset(&station->sta, 0, sizeof(struct il_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 il_station_priv_common *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.

	 */

	il_set_ht_add_station(il, sta_id, sta, ctx);



	/* 3945 only */

	rate = (il->band == IEEE80211_BAND_5GHZ) ?

		RATE_6M_PLCP : RATE_1M_PLCP;

	/* Turn on both antennas for the station... */

	station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);



	return sta_id;



}

EXPORT_SYMBOL_GPL(il_prep_station);



#define STA_WAIT_TIMEOUT (HZ/2)



/**

 * il_add_station_common -

 */

int

il_add_station_common(struct il_priv *il,

			struct il_rxon_context *ctx,

			   const u8 *addr, bool is_ap,

			   struct ieee80211_sta *sta, u8 *sta_id_r)

{

	unsigned long flags_spin;

	int ret = 0;

	u8 sta_id;

	struct il_addsta_cmd sta_cmd;



	*sta_id_r = 0;

	spin_lock_irqsave(&il->sta_lock, flags_spin);

	sta_id = il_prep_station(il, ctx, addr, is_ap, sta);

	if (sta_id == IL_INVALID_STATION) {

		IL_ERR("Unable to prepare station %pM for addition\n",

			addr);

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

		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 (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {

		D_INFO(

			"STA %d already in process of being added.\n",

		       sta_id);

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

		return -EEXIST;

	}



	if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&

	    (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {

		D_ASSOC(

			"STA %d (%pM) already added, not adding again.\n",

			sta_id, addr);

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

		return -EEXIST;

	}



	il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;

	memcpy(&sta_cmd, &il->stations[sta_id].sta,

				sizeof(struct il_addsta_cmd));

	spin_unlock_irqrestore(&il->sta_lock, flags_spin);



	/* Add station to device's station table */

	ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);

	if (ret) {

		spin_lock_irqsave(&il->sta_lock, flags_spin);

		IL_ERR("Adding station %pM failed.\n",

			il->stations[sta_id].sta.sta.addr);

		il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;

		il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

	}

	*sta_id_r = sta_id;

	return ret;

}

EXPORT_SYMBOL(il_add_station_common);



/**

 * il_sta_ucode_deactivate - deactivate ucode status for a station

 *

 * il->sta_lock must be held

 */

static void il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)

{

	/* Ucode must be active and driver must be non active */

	if ((il->stations[sta_id].used &

	     (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=

						IL_STA_UCODE_ACTIVE)

		IL_ERR("removed non active STA %u\n", sta_id);



	il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;



	memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));

	D_ASSOC("Removed STA %u\n", sta_id);

}



static int il_send_remove_station(struct il_priv *il,

				   const u8 *addr, int sta_id,

				   bool temporary)

{

	struct il_rx_pkt *pkt;

	int ret;



	unsigned long flags_spin;

	struct il_rem_sta_cmd rm_sta_cmd;



	struct il_host_cmd cmd = {

		.id = C_REM_STA,

		.len = sizeof(struct il_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 = il_send_cmd(il, &cmd);



	if (ret)

		return ret;



	pkt = (struct il_rx_pkt *)cmd.reply_page;

	if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {

		IL_ERR("Bad return from C_REM_STA (0x%08X)\n",

			  pkt->hdr.flags);

		ret = -EIO;

	}



	if (!ret) {

		switch (pkt->u.rem_sta.status) {

		case REM_STA_SUCCESS_MSK:

			if (!temporary) {

				spin_lock_irqsave(&il->sta_lock, flags_spin);

				il_sta_ucode_deactivate(il, sta_id);

				spin_unlock_irqrestore(&il->sta_lock,

								flags_spin);

			}

			D_ASSOC("C_REM_STA PASSED\n");

			break;

		default:

			ret = -EIO;

			IL_ERR("C_REM_STA failed\n");

			break;

		}

	}

	il_free_pages(il, cmd.reply_page);



	return ret;

}



/**

 * il_remove_station - Remove driver's knowledge of station.

 */

int il_remove_station(struct il_priv *il, const u8 sta_id,

		       const u8 *addr)

{

	unsigned long flags;



	if (!il_is_ready(il)) {

		D_INFO(

			"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;

	}



	D_ASSOC("Removing STA from driver:%d  %pM\n",

			sta_id, addr);



	if (WARN_ON(sta_id == IL_INVALID_STATION))

		return -EINVAL;



	spin_lock_irqsave(&il->sta_lock, flags);



	if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {

		D_INFO("Removing %pM but non DRIVER active\n",

				addr);

		goto out_err;

	}



	if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {

		D_INFO("Removing %pM but non UCODE active\n",

				addr);

		goto out_err;

	}



	if (il->stations[sta_id].used & IL_STA_LOCAL) {

		kfree(il->stations[sta_id].lq);

		il->stations[sta_id].lq = NULL;

	}



	il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;



	il->num_stations--;



	BUG_ON(il->num_stations < 0);



	spin_unlock_irqrestore(&il->sta_lock, flags);



	return il_send_remove_station(il, addr, sta_id, false);

out_err:

	spin_unlock_irqrestore(&il->sta_lock, flags);

	return -EINVAL;

}

EXPORT_SYMBOL_GPL(il_remove_station);



/**

 * il_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 il_clear_ucode_stations(struct il_priv *il,

			      struct il_rxon_context *ctx)

{

	int i;

	unsigned long flags_spin;

	bool cleared = false;



	D_INFO("Clearing ucode stations in driver\n");



	spin_lock_irqsave(&il->sta_lock, flags_spin);

	for (i = 0; i < il->hw_params.max_stations; i++) {

		if (ctx && ctx->ctxid != il->stations[i].ctxid)

			continue;



		if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {

			D_INFO(

				"Clearing ucode active for station %d\n", i);

			il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;

			cleared = true;

		}

	}

	spin_unlock_irqrestore(&il->sta_lock, flags_spin);



	if (!cleared)

		D_INFO(

			"No active stations found to be cleared\n");

}

EXPORT_SYMBOL(il_clear_ucode_stations);



/**

 * il_restore_stations() - Restore driver known stations to device

 *

 * All stations considered active by driver, but not present in ucode, is

 * restored.

 *

 * Function sleeps.

 */

void

il_restore_stations(struct il_priv *il, struct il_rxon_context *ctx)

{

	struct il_addsta_cmd sta_cmd;

	struct il_link_quality_cmd lq;

	unsigned long flags_spin;

	int i;

	bool found = false;

	int ret;

	bool send_lq;



	if (!il_is_ready(il)) {

		D_INFO(

			"Not ready yet, not restoring any stations.\n");

		return;

	}



	D_ASSOC("Restoring all known stations ... start.\n");

	spin_lock_irqsave(&il->sta_lock, flags_spin);

	for (i = 0; i < il->hw_params.max_stations; i++) {

		if (ctx->ctxid != il->stations[i].ctxid)

			continue;

		if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&

		    !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {

			D_ASSOC("Restoring sta %pM\n",

					il->stations[i].sta.sta.addr);

			il->stations[i].sta.mode = 0;

			il->stations[i].used |= IL_STA_UCODE_INPROGRESS;

			found = true;

		}

	}



	for (i = 0; i < il->hw_params.max_stations; i++) {

		if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {

			memcpy(&sta_cmd, &il->stations[i].sta,

			       sizeof(struct il_addsta_cmd));

			send_lq = false;

			if (il->stations[i].lq) {

				memcpy(&lq, il->stations[i].lq,

				       sizeof(struct il_link_quality_cmd));

				send_lq = true;

			}

			spin_unlock_irqrestore(&il->sta_lock, flags_spin);

			ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);

			if (ret) {

				spin_lock_irqsave(&il->sta_lock, flags_spin);

				IL_ERR("Adding station %pM failed.\n",

					il->stations[i].sta.sta.addr);

				il->stations[i].used &=

						~IL_STA_DRIVER_ACTIVE;

				il->stations[i].used &=

						~IL_STA_UCODE_INPROGRESS;

				spin_unlock_irqrestore(&il->sta_lock,

								flags_spin);

			}

			/*

			 * Rate scaling has already been initialized, send

			 * current LQ command

			 */

			if (send_lq)

				il_send_lq_cmd(il, ctx, &lq,

								CMD_SYNC, true);

			spin_lock_irqsave(&il->sta_lock, flags_spin);

			il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;

		}

	}



	spin_unlock_irqrestore(&il->sta_lock, flags_spin);

	if (!found)

		D_INFO("Restoring all known stations"

				" .... no stations to be restored.\n");

	else

		D_INFO("Restoring all known stations"

				" .... complete.\n");

}

EXPORT_SYMBOL(il_restore_stations);



int il_get_free_ucode_key_idx(struct il_priv *il)

{

	int i;



	for (i = 0; i < il->sta_key_max_num; i++)

		if (!test_and_set_bit(i, &il->ucode_key_table))

			return i;



	return WEP_INVALID_OFFSET;

}

EXPORT_SYMBOL(il_get_free_ucode_key_idx);



void il_dealloc_bcast_stations(struct il_priv *il)

{

	unsigned long flags;

	int i;



	spin_lock_irqsave(&il->sta_lock, flags);

	for (i = 0; i < il->hw_params.max_stations; i++) {

		if (!(il->stations[i].used & IL_STA_BCAST))

			continue;



		il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;

		il->num_stations--;

		BUG_ON(il->num_stations < 0);

		kfree(il->stations[i].lq);

		il->stations[i].lq = NULL;

	}

	spin_unlock_irqrestore(&il->sta_lock, flags);

}

EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);



#ifdef CONFIG_IWLEGACY_DEBUG

static void il_dump_lq_cmd(struct il_priv *il,

			   struct il_link_quality_cmd *lq)

{

	int i;

	D_RATE("lq station id 0x%x\n", lq->sta_id);

	D_RATE("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++)

		D_RATE("lq idx %d 0x%X\n",

			       i, lq->rs_table[i].rate_n_flags);

}

#else

static inline void il_dump_lq_cmd(struct il_priv *il,

				   struct il_link_quality_cmd *lq)

{

}

#endif



/**

 * il_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 il_is_lq_table_valid(struct il_priv *il,

			      struct il_rxon_context *ctx,

			      struct il_link_quality_cmd *lq)

{

	int i;



	if (ctx->ht.enabled)

		return true;



	D_INFO("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) {

			D_INFO(

				       "idx %d of LQ expects HT channel\n",

				       i);

			return false;

		}

	}

	return true;

}



/**

 * il_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 il_send_lq_cmd(struct il_priv *il, struct il_rxon_context *ctx,

		    struct il_link_quality_cmd *lq, u8 flags, bool init)

{

	int ret = 0;

	unsigned long flags_spin;



	struct il_host_cmd cmd = {

		.id = C_TX_LINK_QUALITY_CMD,

		.len = sizeof(struct il_link_quality_cmd),

		.flags = flags,

		.data = lq,

	};



	if (WARN_ON(lq->sta_id == IL_INVALID_STATION))

		return -EINVAL;





	spin_lock_irqsave(&il->sta_lock, flags_spin);

	if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

		return -EINVAL;

	}

	spin_unlock_irqrestore(&il->sta_lock, flags_spin);



	il_dump_lq_cmd(il, lq);

	BUG_ON(init && (cmd.flags & CMD_ASYNC));



	if (il_is_lq_table_valid(il, ctx, lq))

		ret = il_send_cmd(il, &cmd);

	else

		ret = -EINVAL;



	if (cmd.flags & CMD_ASYNC)

		return ret;



	if (init) {

		D_INFO("init LQ command complete,"

				" clearing sta addition status for sta %d\n",

			       lq->sta_id);

		spin_lock_irqsave(&il->sta_lock, flags_spin);

		il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;

		spin_unlock_irqrestore(&il->sta_lock, flags_spin);

	}

	return ret;

}

EXPORT_SYMBOL(il_send_lq_cmd);



int il_mac_sta_remove(struct ieee80211_hw *hw,

		       struct ieee80211_vif *vif,

		       struct ieee80211_sta *sta)

{

	struct il_priv *il = hw->priv;

	struct il_station_priv_common *sta_common = (void *)sta->drv_priv;

	int ret;



	D_INFO("received request to remove station %pM\n",

			sta->addr);

	mutex_lock(&il->mutex);

	D_INFO("proceeding to remove station %pM\n",

			sta->addr);

	ret = il_remove_station(il, sta_common->sta_id, sta->addr);

	if (ret)

		IL_ERR("Error removing station %pM\n",

			sta->addr);

	mutex_unlock(&il->mutex);

	return ret;

}

EXPORT_SYMBOL(il_mac_sta_remove);