/******************************************************************************
*
* 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-sta.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-agn-hw.h"
#include "iwl-agn.h"
#include "iwl-trans.h"
/*
* mac80211 queues, ACs, hardware queues, FIFOs.
*
* Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
*
* Mac80211 uses the following numbers, which we get as from it
* by way of skb_get_queue_mapping(skb):
*
* VO 0
* VI 1
* BE 2
* BK 3
*
*
* Regular (not A-MPDU) frames are put into hardware queues corresponding
* to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
* own queue per aggregation session (RA/TID combination), such queues are
* set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
* order to map frames to the right queue, we also need an AC->hw queue
* mapping. This is implemented here.
*
* Due to the way hw queues are set up (by the hw specific modules like
* iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
* mapping.
*/
static const u8 tid_to_ac[] = {
IEEE80211_AC_BE,
IEEE80211_AC_BK,
IEEE80211_AC_BK,
IEEE80211_AC_BE,
IEEE80211_AC_VI,
IEEE80211_AC_VI,
IEEE80211_AC_VO,
IEEE80211_AC_VO
};
static inline int get_ac_from_tid(u16 tid)
{
if (likely(tid < ARRAY_SIZE(tid_to_ac)))
return tid_to_ac[tid];
/* no support for TIDs 8-15 yet */
return -EINVAL;
}
static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid)
{
if (likely(tid < ARRAY_SIZE(tid_to_ac)))
return ctx->ac_to_fifo[tid_to_ac[tid]];
/* no support for TIDs 8-15 yet */
return -EINVAL;
}
static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id,
int tid)
{
if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
(IWLAGN_FIRST_AMPDU_QUEUE +
priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
IWL_WARN(priv,
"queue number out of range: %d, must be %d to %d\n",
txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
IWLAGN_FIRST_AMPDU_QUEUE +
priv->cfg->base_params->num_of_ampdu_queues - 1);
return -EINVAL;
}
/* Modify device's station table to Tx this TID */
return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
}
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