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linux/drivers/net/wireless/iwlwifi/iwl-agn-tx.c

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/******************************************************************************
*
* 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 "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 ||
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 std_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 = std_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 {
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;
}
#define RTS_DFAULT_RETRY_LIMIT 60
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;
/* Set retry limit on DATA packets and Probe Responses*/
if (ieee80211_is_probe_resp(fc))
data_retry_limit = 3;
else
data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
tx_cmd->data_retry_limit = data_retry_limit;
/* Set retry limit on RTS packets */
rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
if (data_retry_limit < rts_retry_limit)
rts_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->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
#ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
if (priv->tm_fixed_rate) {
/*
* rate overwrite by testmode
* we not only send lq command to change rate
* we also re-enforce per data pkt base.
*/
tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
sizeof(tx_cmd->rate_n_flags));
}
#endif
return;
}
/**
* If the current TX rate stored in mac80211 has the MCS bit set, it's
* not really a TX rate. Thus, we use the lowest supported rate for
* this band. Also use the lowest supported rate if the stored rate
* index is invalid.
*/
rate_idx = info->control.rates[0].idx;
if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
(rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
rate_idx = rate_lowest_index(&priv->bands[info->band],
info->control.sta);
/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
if (info->band == IEEE80211_BAND_5GHZ)
rate_idx += IWL_FIRST_OFDM_RATE;
/* Get PLCP rate for tx_cmd->rate_n_flags */
rate_plcp = iwl_rates[rate_idx].plcp;
/* Zero out flags for this packet */
rate_flags = 0;
/* Set CCK flag as needed */
if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
rate_flags |= RATE_MCS_CCK_MSK;
/* Set up antennas */
if (priv->cfg->bt_params &&
priv->cfg->bt_params->advanced_bt_coexist &&
priv->bt_full_concurrent) {
/* operated as 1x1 in full concurrency mode */
priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
first_antenna(priv->hw_params.valid_tx_ant));
} else
priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
priv->hw_params.valid_tx_ant);
rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
/* Set the rate in the TX cmd */
tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
}
static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
struct ieee80211_tx_info *info,
struct iwl_tx_cmd *tx_cmd,
struct sk_buff *skb_frag,
int sta_id)
{
struct ieee80211_key_conf *keyconf = info->control.hw_key;
switch (keyconf->cipher) {
case WLAN_CIPHER_SUITE_CCMP:
tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
if (info->flags & IEEE80211_TX_CTL_AMPDU)
tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
break;
case WLAN_CIPHER_SUITE_TKIP:
tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
break;
case WLAN_CIPHER_SUITE_WEP104:
tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
/* fall through */
case WLAN_CIPHER_SUITE_WEP40:
tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
(keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
"with key %d\n", keyconf->keyidx);
break;
default:
IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
break;
}
}
/*
* start REPLY_TX command process
*/
int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_station_priv *sta_priv = NULL;
struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
struct iwl_tx_cmd *tx_cmd;
int txq_id;
u16 seq_number = 0;
__le16 fc;
u8 hdr_len;
u16 len;
u8 sta_id;
u8 tid = 0;
unsigned long flags;
bool is_agg = false;
/*
* If the frame needs to go out off-channel, then
* we'll have put the PAN context to that channel,
* so make the frame go out there.
*/
if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
ctx = &priv->contexts[IWL_RXON_CTX_PAN];
else if (info->control.vif)
ctx = iwl_rxon_ctx_from_vif(info->control.vif);
spin_lock_irqsave(&priv->lock, flags);
if (iwl_is_rfkill(priv)) {
IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
goto drop_unlock_priv;
}
fc = hdr->frame_control;
#ifdef CONFIG_IWLWIFI_DEBUG
if (ieee80211_is_auth(fc))
IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
else if (ieee80211_is_assoc_req(fc))
IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
else if (ieee80211_is_reassoc_req(fc))
IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
#endif
hdr_len = ieee80211_hdrlen(fc);
/* For management frames use broadcast id to do not break aggregation */
if (!ieee80211_is_data(fc))
sta_id = ctx->bcast_sta_id;
else {
/* Find index into station table for destination station */
sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
hdr->addr1);
goto drop_unlock_priv;
}
}
IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
if (info->control.sta)
sta_priv = (void *)info->control.sta->drv_priv;
if (sta_priv && sta_priv->asleep &&
(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
/*
* This sends an asynchronous command to the device,
* but we can rely on it being processed before the
* next frame is processed -- and the next frame to
* this station is the one that will consume this
* counter.
* For now set the counter to just 1 since we do not
* support uAPSD yet.
*/
iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
}
/*
* Send this frame after DTIM -- there's a special queue
* reserved for this for contexts that support AP mode.
*/
if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
txq_id = ctx->mcast_queue;
/*
* The microcode will clear the more data
* bit in the last frame it transmits.
*/
hdr->frame_control |=
cpu_to_le16(IEEE80211_FCTL_MOREDATA);
} else
txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
/* irqs already disabled/saved above when locking priv->lock */
spin_lock(&priv->sta_lock);
if (ieee80211_is_data_qos(fc)) {
u8 *qc = NULL;
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
goto drop_unlock_sta;
seq_number = priv->stations[sta_id].tid[tid].seq_number;
seq_number &= IEEE80211_SCTL_SEQ;
hdr->seq_ctrl = hdr->seq_ctrl &
cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(seq_number);
seq_number += 0x10;
/* aggregation is on for this <sta,tid> */
if (info->flags & IEEE80211_TX_CTL_AMPDU &&
priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
is_agg = true;
}
}
tx_cmd = trans_get_tx_cmd(&priv->trans, txq_id);
if (unlikely(!tx_cmd))
goto drop_unlock_sta;
/* Copy MAC header from skb into command buffer */
memcpy(tx_cmd->hdr, hdr, hdr_len);
/* Total # bytes to be transmitted */
len = (u16)skb->len;
tx_cmd->len = cpu_to_le16(len);
if (info->control.hw_key)
iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
/* TODO need this for burst mode later on */
iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
iwl_dbg_log_tx_data_frame(priv, len, hdr);
iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
iwl_update_stats(priv, true, fc, len);
if (trans_tx(&priv->trans, skb, tx_cmd, txq_id, fc, is_agg, ctx))
goto drop_unlock_sta;
if (ieee80211_is_data_qos(fc)) {
priv->stations[sta_id].tid[tid].tfds_in_queue++;
if (!ieee80211_has_morefrags(fc))
priv->stations[sta_id].tid[tid].seq_number = seq_number;
}
spin_unlock(&priv->sta_lock);
spin_unlock_irqrestore(&priv->lock, flags);
/*
* Avoid atomic ops if it isn't an associated client.
* Also, if this is a packet for aggregation, don't
* increase the counter because the ucode will stop
* aggregation queues when their respective station
* goes to sleep.
*/
if (sta_priv && sta_priv->client && !is_agg)
atomic_inc(&sta_priv->pending_frames);
return 0;
drop_unlock_sta:
spin_unlock(&priv->sta_lock);
drop_unlock_priv:
spin_unlock_irqrestore(&priv->lock, flags);
return -1;
}
/*
* Find first available (lowest unused) Tx Queue, mark it "active".
* Called only when finding queue for aggregation.
* Should never return anything < 7, because they should already
* be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
*/
static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
{
int txq_id;
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
return txq_id;
return -1;
}
int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
int sta_id;
int tx_fifo;
int txq_id;
int ret;
unsigned long flags;
struct iwl_tid_data *tid_data;
tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
if (unlikely(tx_fifo < 0))
return tx_fifo;
IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
sta->addr, tid);
sta_id = iwl_sta_id(sta);
if (sta_id == IWL_INVALID_STATION) {
IWL_ERR(priv, "Start AGG on invalid station\n");
return -ENXIO;
}
if (unlikely(tid >= MAX_TID_COUNT))
return -EINVAL;
if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
return -ENXIO;
}
txq_id = iwlagn_txq_ctx_activate_free(priv);
if (txq_id == -1) {
IWL_ERR(priv, "No free aggregation queue available\n");
return -ENXIO;
}
spin_lock_irqsave(&priv->sta_lock, flags);
tid_data = &priv->stations[sta_id].tid[tid];
*ssn = SEQ_TO_SN(tid_data->seq_number);
tid_data->agg.txq_id = txq_id;
tid_data->agg.tx_fifo = tx_fifo;
iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
spin_unlock_irqrestore(&priv->sta_lock, flags);
ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
if (ret)
return ret;
spin_lock_irqsave(&priv->sta_lock, flags);
tid_data = &priv->stations[sta_id].tid[tid];
if (tid_data->tfds_in_queue == 0) {
IWL_DEBUG_HT(priv, "HW queue is empty\n");
tid_data->agg.state = IWL_AGG_ON;
ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
} else {
IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
tid_data->tfds_in_queue);
tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
}
spin_unlock_irqrestore(&priv->sta_lock, flags);
return ret;
}
int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u16 tid)
{
int tx_fifo_id, txq_id, sta_id, ssn;
struct iwl_tid_data *tid_data;
int write_ptr, read_ptr;
unsigned long flags;
tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
if (unlikely(tx_fifo_id < 0))
return tx_fifo_id;
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_irqsave(&priv->sta_lock, flags);
tid_data = &priv->stations[sta_id].tid[tid];
ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
txq_id = tid_data->agg.txq_id;
switch (priv->stations[sta_id].tid[tid].agg.state) {
case IWL_EMPTYING_HW_QUEUE_ADDBA:
/*
* This can happen if the peer stops aggregation
* again before we've had a chance to drain the
* queue we selected previously, i.e. before the
* session was really started completely.
*/
IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
goto turn_off;
case IWL_AGG_ON:
break;
default:
IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
}
write_ptr = priv->txq[txq_id].q.write_ptr;
read_ptr = priv->txq[txq_id].q.read_ptr;
/* The queue is not empty */
if (write_ptr != read_ptr) {
IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
priv->stations[sta_id].tid[tid].agg.state =
IWL_EMPTYING_HW_QUEUE_DELBA;
spin_unlock_irqrestore(&priv->sta_lock, flags);
return 0;
}
IWL_DEBUG_HT(priv, "HW queue is empty\n");
turn_off:
priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
/* do not restore/save irqs */
spin_unlock(&priv->sta_lock);
spin_lock(&priv->lock);
/*
* the only reason this call can fail is queue number out of range,
* which can happen if uCode is reloaded and all the station
* information are lost. if it is outside the range, there is no need
* to deactivate the uCode queue, just return "success" to allow
* mac80211 to clean up it own data.
*/
trans_txq_agg_disable(&priv->trans, txq_id, ssn, tx_fifo_id);
spin_unlock_irqrestore(&priv->lock, flags);
ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
return 0;
}
int iwlagn_txq_check_empty(struct iwl_priv *priv,
int sta_id, u8 tid, int txq_id)
{
struct iwl_queue *q = &priv->txq[txq_id].q;
u8 *addr = priv->stations[sta_id].sta.sta.addr;
struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
struct iwl_rxon_context *ctx;
ctx = &priv->contexts[priv->stations[sta_id].ctxid];
lockdep_assert_held(&priv->sta_lock);
switch (priv->stations[sta_id].tid[tid].agg.state) {
case IWL_EMPTYING_HW_QUEUE_DELBA:
/* We are reclaiming the last packet of the */
/* aggregated HW queue */
if ((txq_id == tid_data->agg.txq_id) &&
(q->read_ptr == q->write_ptr)) {
u16 ssn = SEQ_TO_SN(tid_data->seq_number);
int tx_fifo = get_fifo_from_tid(ctx, tid);
IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
trans_txq_agg_disable(&priv->trans, txq_id,
ssn, tx_fifo);
tid_data->agg.state = IWL_AGG_OFF;
ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
}
break;
case IWL_EMPTYING_HW_QUEUE_ADDBA:
/* We are reclaiming the last packet of the queue */
if (tid_data->tfds_in_queue == 0) {
IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
tid_data->agg.state = IWL_AGG_ON;
ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
}
break;
}
return 0;
}
static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
struct iwl_rxon_context *ctx,
const u8 *addr1)
{
struct ieee80211_sta *sta;
struct iwl_station_priv *sta_priv;
rcu_read_lock();
sta = ieee80211_find_sta(ctx->vif, addr1);
if (sta) {
sta_priv = (void *)sta->drv_priv;
/* avoid atomic ops if this isn't a client */
if (sta_priv->client &&
atomic_dec_return(&sta_priv->pending_frames) == 0)
ieee80211_sta_block_awake(priv->hw, sta, false);
}
rcu_read_unlock();
}
static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
bool is_agg)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
if (!is_agg)
iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
}
int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct iwl_queue *q = &txq->q;
struct iwl_tx_info *tx_info;
int nfreed = 0;
struct ieee80211_hdr *hdr;
if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
"index %d is out of range [0-%d] %d %d.\n", __func__,
txq_id, index, q->n_bd, q->write_ptr, q->read_ptr);
return 0;
}
for (index = iwl_queue_inc_wrap(index, q->n_bd);
q->read_ptr != index;
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
tx_info = &txq->txb[txq->q.read_ptr];
if (WARN_ON_ONCE(tx_info->skb == NULL))
continue;
hdr = (struct ieee80211_hdr *)tx_info->skb->data;
if (ieee80211_is_data_qos(hdr->frame_control))
nfreed++;
iwlagn_tx_status(priv, tx_info,
txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
tx_info->skb = NULL;
iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr);
}
return nfreed;
}
/**
* iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
*
* Go through block-ack's bitmap of ACK'd frames, update driver's record of
* ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
*/
static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
struct iwl_ht_agg *agg,
struct iwl_compressed_ba_resp *ba_resp)
{
int sh;
u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
struct ieee80211_tx_info *info;
u64 bitmap, sent_bitmap;
if (unlikely(!agg->wait_for_ba)) {
if (unlikely(ba_resp->bitmap))
IWL_ERR(priv, "Received BA when not expected\n");
return -EINVAL;
}
/* Mark that the expected block-ack response arrived */
agg->wait_for_ba = 0;
IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
/* Calculate shift to align block-ack bits with our Tx window bits */
sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
if (sh < 0)
sh += 0x100;
/*
* Check for success or failure according to the
* transmitted bitmap and block-ack bitmap
*/
bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
sent_bitmap = bitmap & agg->bitmap;
/* Sanity check values reported by uCode */
if (ba_resp->txed_2_done > ba_resp->txed) {
IWL_DEBUG_TX_REPLY(priv,
"bogus sent(%d) and ack(%d) count\n",
ba_resp->txed, ba_resp->txed_2_done);
/*
* set txed_2_done = txed,
* so it won't impact rate scale
*/
ba_resp->txed = ba_resp->txed_2_done;
}
IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
ba_resp->txed, ba_resp->txed_2_done);
/* Find the first ACKed frame to store the TX status */
while (sent_bitmap && !(sent_bitmap & 1)) {
agg->start_idx = (agg->start_idx + 1) & 0xff;
sent_bitmap >>= 1;
}
info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
memset(&info->status, 0, sizeof(info->status));
info->flags |= IEEE80211_TX_STAT_ACK;
info->flags |= IEEE80211_TX_STAT_AMPDU;
info->status.ampdu_ack_len = ba_resp->txed_2_done;
info->status.ampdu_len = ba_resp->txed;
iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
return 0;
}
/**
* translate ucode response to mac80211 tx status control values
*/
void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
struct ieee80211_tx_info *info)
{
struct ieee80211_tx_rate *r = &info->control.rates[0];
info->antenna_sel_tx =
((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
if (rate_n_flags & RATE_MCS_HT_MSK)
r->flags |= IEEE80211_TX_RC_MCS;
if (rate_n_flags & RATE_MCS_GF_MSK)
r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
if (rate_n_flags & RATE_MCS_HT40_MSK)
r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
if (rate_n_flags & RATE_MCS_DUP_MSK)
r->flags |= IEEE80211_TX_RC_DUP_DATA;
if (rate_n_flags & RATE_MCS_SGI_MSK)
r->flags |= IEEE80211_TX_RC_SHORT_GI;
r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
}
/**
* iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
*
* Handles block-acknowledge notification from device, which reports success
* of frames sent via aggregation.
*/
void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
struct iwl_tx_queue *txq = NULL;
struct iwl_ht_agg *agg;
int index;
int sta_id;
int tid;
unsigned long flags;
/* "flow" corresponds to Tx queue */
u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
/* "ssn" is start of block-ack Tx window, corresponds to index
* (in Tx queue's circular buffer) of first TFD/frame in window */
u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
if (scd_flow >= priv->hw_params.max_txq_num) {
IWL_ERR(priv,
"BUG_ON scd_flow is bigger than number of queues\n");
return;
}
txq = &priv->txq[scd_flow];
sta_id = ba_resp->sta_id;
tid = ba_resp->tid;
agg = &priv->stations[sta_id].tid[tid].agg;
if (unlikely(agg->txq_id != scd_flow)) {
/*
* FIXME: this is a uCode bug which need to be addressed,
* log the information and return for now!
* since it is possible happen very often and in order
* not to fill the syslog, don't enable the logging by default
*/
IWL_DEBUG_TX_REPLY(priv,
"BA scd_flow %d does not match txq_id %d\n",
scd_flow, agg->txq_id);
return;
}
/* Find index just before block-ack window */
index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
spin_lock_irqsave(&priv->sta_lock, flags);
IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
"sta_id = %d\n",
agg->wait_for_ba,
(u8 *) &ba_resp->sta_addr_lo32,
ba_resp->sta_id);
IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
"%d, scd_ssn = %d\n",
ba_resp->tid,
ba_resp->seq_ctl,
(unsigned long long)le64_to_cpu(ba_resp->bitmap),
ba_resp->scd_flow,
ba_resp->scd_ssn);
IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
agg->start_idx,
(unsigned long long)agg->bitmap);
/* Update driver's record of ACK vs. not for each frame in window */
iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
/* Release all TFDs before the SSN, i.e. all TFDs in front of
* block-ack window (we assume that they've been successfully
* transmitted ... if not, it's too late anyway). */
if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
/* calculate mac80211 ampdu sw queue to wake */
int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
priv->mac80211_registered &&
(agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
iwl_wake_queue(priv, txq);
iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
}
spin_unlock_irqrestore(&priv->sta_lock, flags);
}
#ifdef CONFIG_IWLWIFI_DEBUG
const char *iwl_get_tx_fail_reason(u32 status)
{
#define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
#define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
switch (status & TX_STATUS_MSK) {
case TX_STATUS_SUCCESS:
return "SUCCESS";
TX_STATUS_POSTPONE(DELAY);
TX_STATUS_POSTPONE(FEW_BYTES);
TX_STATUS_POSTPONE(BT_PRIO);
TX_STATUS_POSTPONE(QUIET_PERIOD);
TX_STATUS_POSTPONE(CALC_TTAK);
TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
TX_STATUS_FAIL(SHORT_LIMIT);
TX_STATUS_FAIL(LONG_LIMIT);
TX_STATUS_FAIL(FIFO_UNDERRUN);
TX_STATUS_FAIL(DRAIN_FLOW);
TX_STATUS_FAIL(RFKILL_FLUSH);
TX_STATUS_FAIL(LIFE_EXPIRE);
TX_STATUS_FAIL(DEST_PS);
TX_STATUS_FAIL(HOST_ABORTED);
TX_STATUS_FAIL(BT_RETRY);
TX_STATUS_FAIL(STA_INVALID);
TX_STATUS_FAIL(FRAG_DROPPED);
TX_STATUS_FAIL(TID_DISABLE);
TX_STATUS_FAIL(FIFO_FLUSHED);
TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
TX_STATUS_FAIL(PASSIVE_NO_RX);
TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
}
return "UNKNOWN";
#undef TX_STATUS_FAIL
#undef TX_STATUS_POSTPONE
}
#endif /* CONFIG_IWLWIFI_DEBUG */
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