path: root/drivers/net/wireless/iwlwifi/iwl-agn-tx.c

/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * 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.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ieee80211.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-agn-hw.h"
#include "iwl-agn.h"
#include "iwl-trans.h"

static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
				     struct ieee80211_tx_info *info,
				     __le16 fc, __le32 *tx_flags)
{
	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
	    info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
	    info->flags & IEEE80211_TX_CTL_AMPDU)
		*tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
}

/*
 * handle build REPLY_TX command notification.
 */
static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
				      struct sk_buff *skb,
				      struct iwl_tx_cmd *tx_cmd,
				      struct ieee80211_tx_info *info,
				      struct ieee80211_hdr *hdr, u8 sta_id)
{
	__le16 fc = hdr->frame_control;
	__le32 tx_flags = tx_cmd->tx_flags;

	tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
		tx_flags |= TX_CMD_FLG_ACK_MSK;
	else
		tx_flags &= ~TX_CMD_FLG_ACK_MSK;

	if (ieee80211_is_probe_resp(fc))
		tx_flags |= TX_CMD_FLG_TSF_MSK;
	else if (ieee80211_is_back_req(fc))
		tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
	else if (info->band == IEEE80211_BAND_2GHZ &&
		 priv->cfg->bt_params &&
		 priv->cfg->bt_params->advanced_bt_coexist &&
		 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
		 ieee80211_is_reassoc_req(fc) ||
		 skb->protocol == cpu_to_be16(ETH_P_PAE)))
		tx_flags |= TX_CMD_FLG_IGNORE_BT;


	tx_cmd->sta_id = sta_id;
	if (ieee80211_has_morefrags(fc))
		tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;

	if (ieee80211_is_data_qos(fc)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
		tx_cmd->tid_tspec = qc[0] & 0xf;
		tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
	} else {
		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
			tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
		else
			tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
	}

	iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);

	tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
	if (ieee80211_is_mgmt(fc)) {
		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
		else
			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
	} else {
		tx_cmd->timeout.pm_frame_timeout = 0;
	}

	tx_cmd->driver_txop = 0;
	tx_cmd->tx_flags = tx_flags;
	tx_cmd->next_frame_len = 0;
}

static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
				     struct iwl_tx_cmd *tx_cmd,
				     struct ieee80211_tx_info *info,
				     __le16 fc)
{
	u32 rate_flags;
	int rate_idx;
	u8 rts_retry_limit;
	u8 data_retry_limit;
	u8 rate_plcp;

	if (priv->shrd->wowlan) {
		rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
		data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
	} else {
		/* Set retry limit on RTS packets */
		rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;

		/* Set retry limit on DATA packets and Probe Responses*/
		if (ieee80211_is_probe_resp(fc)) {
			data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
			rts_retry_limit =
				min(data_retry_limit, rts_retry_limit);
		} else if (ieee80211_is_back_req(fc))
			data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
		else
			data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
	}

	tx_cmd->data_retry_limit = data_retry_limit;
	tx_cmd->rts_retry_limit = rts_retry_limit;

	/* DATA packets will use the uCode station table for rate/antenna
	 * selection */
	if (ieee80211_is_data(fc)) {
		tx_cmd->initial_rate_index = 0;
		tx_cmd->