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linux/drivers/net/wireless/iwlwifi/mvm/tx.c
Emmanuel Grumbach e3d4bc8cc0 iwlwifi: mvm: fix aggregation drain flow 
Move the counter for non-AMPDU frames to mvm. It is needed
for the drain flow which happens once the ieee80211_sta has
been freed, so keeping it in iwl_mvm_sta which is embed into
ieee80211_sta is not a good idea.

Also, since its purpose it to remove the STA in the fw only
after all the frames for this station have exited the shared
Tx queues, we need to decrement it in the reclaim flow. This
flow can happen after ieee80211_sta has been removed, which
means that we have no iwl_mvm_sta there. So we can't know
what is the vif type. Hence, we know audit these frames for
all the vif types.
In order to avoid spawning sta_drained_wk all the time, we
now check that we are in a flow in which draining might
happen - only when mvmsta is NULL. This is better than
previous code that would spawn sta_drained_wk all the time
in AP mode.

Cc: stable@vger.kernel.org [3.9]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-05-16 22:39:07 +02:00

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/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2012 - 2013 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 COPYING.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <linux/ieee80211.h>
#include <linux/etherdevice.h>
#include "iwl-trans.h"
#include "iwl-eeprom-parse.h"
#include "mvm.h"
#include "sta.h"
/*
* Sets most of the Tx cmd's fields
*/
static void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
struct iwl_tx_cmd *tx_cmd,
struct ieee80211_tx_info *info, u8 sta_id)
{
struct ieee80211_hdr *hdr = (void *)skb->data;
__le16 fc = hdr->frame_control;
u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
u32 len = skb->len + FCS_LEN;
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
tx_flags |= TX_CMD_FLG_ACK;
else
tx_flags &= ~TX_CMD_FLG_ACK;
if (ieee80211_is_probe_resp(fc))
tx_flags |= TX_CMD_FLG_TSF;
else if (ieee80211_is_back_req(fc))
tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
/* High prio packet (wrt. BT coex) if it is EAPOL, MCAST or MGMT */
if (info->band == IEEE80211_BAND_2GHZ &&
(skb->protocol == cpu_to_be16(ETH_P_PAE) ||
is_multicast_ether_addr(hdr->addr1) ||
ieee80211_is_back_req(fc) ||
ieee80211_is_mgmt(fc)))
tx_flags |= TX_CMD_FLG_BT_DIS;
if (ieee80211_has_morefrags(fc))
tx_flags |= TX_CMD_FLG_MORE_FRAG;
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;
} else {
tx_cmd->tid_tspec = IWL_TID_NON_QOS;
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
tx_flags |= TX_CMD_FLG_SEQ_CTL;
else
tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
}
if (ieee80211_is_mgmt(fc)) {
if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
tx_cmd->pm_frame_timeout = cpu_to_le16(3);
else
tx_cmd->pm_frame_timeout = cpu_to_le16(2);
/* The spec allows Action frames in A-MPDU, we don't support
* it
*/
WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
} else {
tx_cmd->pm_frame_timeout = 0;
}
if (info->flags & IEEE80211_TX_CTL_AMPDU)
tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
!is_multicast_ether_addr(ieee80211_get_DA(hdr)))
tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
tx_cmd->driver_txop = 0;
tx_cmd->tx_flags = cpu_to_le32(tx_flags);
/* Total # bytes to be transmitted */
tx_cmd->len = cpu_to_le16((u16)skb->len);
tx_cmd->next_frame_len = 0;
tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
tx_cmd->sta_id = sta_id;
}
/*
* Sets the fields in the Tx cmd that are rate related
*/
static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm,
struct iwl_tx_cmd *tx_cmd,
struct ieee80211_tx_info *info,
struct ieee80211_sta *sta,
__le16 fc)
{
u32 rate_flags;
int rate_idx;
u8 rate_plcp;
/* Set retry limit on RTS packets */
tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
/* Set retry limit on DATA packets and Probe Responses*/
if (ieee80211_is_probe_resp(fc)) {
tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
tx_cmd->rts_retry_limit =
min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
} else if (ieee80211_is_back_req(fc)) {
tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
} else {
tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
}
/*
* for data packets, rate info comes from the table inside he fw. This
* table is controlled by LINK_QUALITY commands
*/
if (ieee80211_is_data(fc)) {
tx_cmd->initial_rate_index = 0;
tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
return;
} else if (ieee80211_is_back_req(fc)) {
tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
}
/* HT rate doesn't make sense for a non data frame */
WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
"Got an HT rate for a non data frame 0x%x\n",
info->control.rates[0].flags);
rate_idx = info->control.rates[0].idx;
/* if the rate isn't a well known legacy rate, take the lowest one */
if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
rate_idx = rate_lowest_index(
&mvm->nvm_data->bands[info->band], sta);
/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
if (info->band == IEEE80211_BAND_5GHZ)
rate_idx += IWL_FIRST_OFDM_RATE;
/* For 2.4 GHZ band, check that there is no need to remap */
BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
/* Get PLCP rate for tx_cmd->rate_n_flags */
rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
mvm->mgmt_last_antenna_idx =
iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
mvm->mgmt_last_antenna_idx);
rate_flags = BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
/* 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 the rate in the TX cmd */
tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
}
/*
* Sets the fields in the Tx cmd that are crypto related
*/
static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
struct ieee80211_tx_info *info,
struct iwl_tx_cmd *tx_cmd,
struct sk_buff *skb_frag)
{
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 |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG);
break;
case WLAN_CIPHER_SUITE_TKIP:
tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
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_WEP_KEY_IDX_POS) &
TX_CMD_SEC_WEP_KEY_IDX_MSK);
memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
break;
default:
IWL_ERR(mvm, "Unknown encode cipher %x\n", keyconf->cipher);
break;
}
}
/*
* Allocates and sets the Tx cmd the driver data pointers in the skb
*/
static struct iwl_device_cmd *
iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
struct ieee80211_sta *sta, u8 sta_id)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_device_cmd *dev_cmd;
struct iwl_tx_cmd *tx_cmd;
dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
if (unlikely(!dev_cmd))
return NULL;
memset(dev_cmd, 0, sizeof(*dev_cmd));
tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
if (info->control.hw_key)
iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb);
iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
memset(&info->status, 0, sizeof(info->status));
info->driver_data[0] = NULL;
info->driver_data[1] = dev_cmd;
return dev_cmd;
}
int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_device_cmd *dev_cmd;
struct iwl_tx_cmd *tx_cmd;
u8 sta_id;
if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
return -1;
if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
(!info->control.vif ||
info->hw_queue != info->control.vif->cab_queue)))
return -1;
/*
* If the interface on which frame is sent is the P2P_DEVICE
* or an AP/GO interface use the broadcast station associated
* with it; otherwise use the AUX station.
*/
if (info->control.vif &&
(info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
info->control.vif->type == NL80211_IFTYPE_AP)) {
struct iwl_mvm_vif *mvmvif =
iwl_mvm_vif_from_mac80211(info->control.vif);
sta_id = mvmvif->bcast_sta.sta_id;
} else {
sta_id = mvm->aux_sta.sta_id;
}
IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);
dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id);
if (!dev_cmd)
return -1;
/* From now on, we cannot access info->control */
tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
/* Copy MAC header from skb into command buffer */
memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control));
if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
return -1;
}
return 0;
}
/*
* Sets the fields in the Tx cmd that are crypto related
*/
int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
struct ieee80211_sta *sta)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_mvm_sta *mvmsta;
struct iwl_device_cmd *dev_cmd;
struct iwl_tx_cmd *tx_cmd;
__le16 fc;
u16 seq_number = 0;
u8 tid = IWL_MAX_TID_COUNT;
u8 txq_id = info->hw_queue;
bool is_data_qos = false, is_ampdu = false;
mvmsta = (void *)sta->drv_priv;
fc = hdr->frame_control;
if (WARN_ON_ONCE(!mvmsta))
return -1;
if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
return -1;
dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
if (!dev_cmd)
goto drop;
tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
/* From now on, we cannot access info->control */
spin_lock(&mvmsta->lock);
if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
u8 *qc = NULL;
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
goto drop_unlock_sta;
seq_number = mvmsta->tid_data[tid].seq_number;
seq_number &= IEEE80211_SCTL_SEQ;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(seq_number);
seq_number += 0x10;
is_data_qos = true;
is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
}
/* Copy MAC header from skb into command buffer */
memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc));
WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
if (is_ampdu) {
if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
goto drop_unlock_sta;
txq_id = mvmsta->tid_data[tid].txq_id;
}
IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
tid, txq_id, seq_number);
/* NOTE: aggregation will need changes here (for txq id) */
if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
goto drop_unlock_sta;
if (is_data_qos && !ieee80211_has_morefrags(fc))
mvmsta->tid_data[tid].seq_number = seq_number;
spin_unlock(&mvmsta->lock);
if (txq_id < IWL_MVM_FIRST_AGG_QUEUE)
atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
return 0;
drop_unlock_sta:
iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
spin_unlock(&mvmsta->lock);
drop:
return -1;
}
static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
struct ieee80211_sta *sta, u8 tid)
{
struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
struct ieee80211_vif *vif = mvmsta->vif;
lockdep_assert_held(&mvmsta->lock);
if (tid_data->ssn != tid_data->next_reclaimed)
return;
switch (tid_data->state) {
case IWL_EMPTYING_HW_QUEUE_ADDBA:
IWL_DEBUG_TX_QUEUES(mvm,
"Can continue addBA flow ssn = next_recl = %d\n",
tid_data->next_reclaimed);
tid_data->state = IWL_AGG_STARTING;
ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
break;
case IWL_EMPTYING_HW_QUEUE_DELBA:
IWL_DEBUG_TX_QUEUES(mvm,
"Can continue DELBA flow ssn = next_recl = %d\n",
tid_data->next_reclaimed);
iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
tid_data->state = IWL_AGG_OFF;
/*
* we can't hold the mutex - but since we are after a sequence
* point (call to iwl_trans_txq_disable), so we don't even need
* a memory barrier.
*/
mvm->queue_to_mac80211[tid_data->txq_id] =
IWL_INVALID_MAC80211_QUEUE;
ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
break;
default:
break;
}
}
#ifdef CONFIG_IWLWIFI_DEBUG
const char *iwl_mvm_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(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(SMALL_CF_POLL);
TX_STATUS_FAIL(FW_DROP);
TX_STATUS_FAIL(STA_COLOR_MISMATCH);
}
return "UNKNOWN";
#undef TX_STATUS_FAIL
#undef TX_STATUS_POSTPONE
}
#endif /* CONFIG_IWLWIFI_DEBUG */
/**
* translate ucode response to mac80211 tx status control values
*/
static void iwl_mvm_hwrate_to_tx_control(u32 rate_n_flags,
struct ieee80211_tx_info *info)
{
struct ieee80211_tx_rate *r = &info->status.rates[0];
info->status.antenna =
((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
if (rate_n_flags & RATE_HT_MCS_GF_MSK)
r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
case RATE_MCS_CHAN_WIDTH_20:
break;
case RATE_MCS_CHAN_WIDTH_40:
r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
break;
case RATE_MCS_CHAN_WIDTH_80:
r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
break;
case RATE_MCS_CHAN_WIDTH_160:
r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
break;
}
if (rate_n_flags & RATE_MCS_SGI_MSK)
r->flags |= IEEE80211_TX_RC_SHORT_GI;
if (rate_n_flags & RATE_MCS_HT_MSK) {
r->flags |= IEEE80211_TX_RC_MCS;
r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
ieee80211_rate_set_vht(
r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
RATE_VHT_MCS_NSS_POS) + 1);
r->flags |= IEEE80211_TX_RC_VHT_MCS;
} else {
r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
info->band);
}
}
static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
struct iwl_rx_packet *pkt)
{
struct ieee80211_sta *sta;
u16 sequence = le16_to_cpu(pkt->hdr.sequence);
int txq_id = SEQ_TO_QUEUE(sequence);
struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
u32 status = le16_to_cpu(tx_resp->status.status);
u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
struct iwl_mvm_sta *mvmsta;
struct sk_buff_head skbs;
u8 skb_freed = 0;
u16 next_reclaimed, seq_ctl;
__skb_queue_head_init(&skbs);
seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
/* we can free until ssn % q.n_bd not inclusive */
iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
while (!skb_queue_empty(&skbs)) {
struct sk_buff *skb = __skb_dequeue(&skbs);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
skb_freed++;
iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
memset(&info->status, 0, sizeof(info->status));
info->flags &= ~IEEE80211_TX_CTL_AMPDU;
/* inform mac80211 about what happened with the frame */
switch (status & TX_STATUS_MSK) {
case TX_STATUS_SUCCESS:
case TX_STATUS_DIRECT_DONE:
info->flags |= IEEE80211_TX_STAT_ACK;
break;
case TX_STATUS_FAIL_DEST_PS:
info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
break;
default:
break;
}
info->status.rates[0].count = tx_resp->failure_frame + 1;
iwl_mvm_hwrate_to_tx_control(le32_to_cpu(tx_resp->initial_rate),
info);
/* Single frame failure in an AMPDU queue => send BAR */
if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE &&
!(info->flags & IEEE80211_TX_STAT_ACK))
info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
/* W/A FW bug: seq_ctl is wrong when the queue is flushed */
if (status == TX_STATUS_FAIL_FIFO_FLUSHED) {
struct ieee80211_hdr *hdr = (void *)skb->data;
seq_ctl = le16_to_cpu(hdr->seq_ctrl);
}
ieee80211_tx_status_ni(mvm->hw, skb);
}
if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE) {
/* If this is an aggregation queue, we use the ssn since:
* ssn = wifi seq_num % 256.
* The seq_ctl is the sequence control of the packet to which
* this Tx response relates. But if there is a hole in the
* bitmap of the BA we received, this Tx response may allow to
* reclaim the hole and all the subsequent packets that were
* already acked. In that case, seq_ctl != ssn, and the next
* packet to be reclaimed will be ssn and not seq_ctl. In that
* case, several packets will be reclaimed even if
* frame_count = 1.
*
* The ssn is the index (% 256) of the latest packet that has
* treated (acked / dropped) + 1.
*/
next_reclaimed = ssn;
} else {
/* The next packet to be reclaimed is the one after this one */
next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
}
IWL_DEBUG_TX_REPLY(mvm,
"TXQ %d status %s (0x%08x)\n",
txq_id, iwl_mvm_get_tx_fail_reason(status), status);
IWL_DEBUG_TX_REPLY(mvm,
"\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
le32_to_cpu(tx_resp->initial_rate),
tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
ssn, next_reclaimed, seq_ctl);
rcu_read_lock();
sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
if (!IS_ERR_OR_NULL(sta)) {
mvmsta = (void *)sta->drv_priv;
if (tid != IWL_TID_NON_QOS) {
struct iwl_mvm_tid_data *tid_data =
&mvmsta->tid_data[tid];
spin_lock_bh(&mvmsta->lock);
tid_data->next_reclaimed = next_reclaimed;
IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
next_reclaimed);
iwl_mvm_check_ratid_empty(mvm, sta, tid);
spin_unlock_bh(&mvmsta->lock);
}
#ifdef CONFIG_PM_SLEEP
mvmsta->last_seq_ctl = seq_ctl;
#endif
} else {
sta = NULL;
mvmsta = NULL;
}
/*
* If the txq is not an AMPDU queue, there is no chance we freed
* several skbs. Check that out...
*/
if (txq_id < IWL_MVM_FIRST_AGG_QUEUE && !WARN_ON(skb_freed > 1) &&
atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id])) {
if (mvmsta) {
/*
* If there are no pending frames for this STA, notify
* mac80211 that this station can go to sleep in its
* STA table.
*/
if (mvmsta->vif->type == NL80211_IFTYPE_AP)
ieee80211_sta_block_awake(mvm->hw, sta, false);
/*
* We might very well have taken mvmsta pointer while
* the station was being removed. The remove flow might
* have seen a pending_frame (because we didn't take
* the lock) even if now the queues are drained. So make
* really sure now that this the station is not being
* removed. If it is, run the drain worker to remove it.
*/
spin_lock_bh(&mvmsta->lock);
sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
if (IS_ERR_OR_NULL(sta)) {
/*
* Station disappeared in the meantime:
* so we are draining.
*/
set_bit(sta_id, mvm->sta_drained);
schedule_work(&mvm->sta_drained_wk);
}
spin_unlock_bh(&mvmsta->lock);
} else if (!mvmsta) {
/* Tx response without STA, so we are draining */
set_bit(sta_id, mvm->sta_drained);
schedule_work(&mvm->sta_drained_wk);
}
}
rcu_read_unlock();
}
#ifdef CONFIG_IWLWIFI_DEBUG
#define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
static const char *iwl_get_agg_tx_status(u16 status)
{
switch (status & AGG_TX_STATE_STATUS_MSK) {
AGG_TX_STATE_(TRANSMITTED);
AGG_TX_STATE_(UNDERRUN);
AGG_TX_STATE_(BT_PRIO);
AGG_TX_STATE_(FEW_BYTES);
AGG_TX_STATE_(ABORT);
AGG_TX_STATE_(LAST_SENT_TTL);
AGG_TX_STATE_(LAST_SENT_TRY_CNT);
AGG_TX_STATE_(LAST_SENT_BT_KILL);
AGG_TX_STATE_(SCD_QUERY);
AGG_TX_STATE_(TEST_BAD_CRC32);
AGG_TX_STATE_(RESPONSE);
AGG_TX_STATE_(DUMP_TX);
AGG_TX_STATE_(DELAY_TX);
}
return "UNKNOWN";
}
static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
struct iwl_rx_packet *pkt)
{
struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
struct agg_tx_status *frame_status = &tx_resp->status;
int i;
for (i = 0; i < tx_resp->frame_count; i++) {
u16 fstatus = le16_to_cpu(frame_status[i].status);
IWL_DEBUG_TX_REPLY(mvm,
"status %s (0x%04x), try-count (%d) seq (0x%x)\n",
iwl_get_agg_tx_status(fstatus),
fstatus & AGG_TX_STATE_STATUS_MSK,
(fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
AGG_TX_STATE_TRY_CNT_POS,
le16_to_cpu(frame_status[i].sequence));
}
}
#else
static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
struct iwl_rx_packet *pkt)
{}
#endif /* CONFIG_IWLWIFI_DEBUG */
static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
struct iwl_rx_packet *pkt)
{
struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
u16 sequence = le16_to_cpu(pkt->hdr.sequence);
struct ieee80211_sta *sta;
if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < IWL_MVM_FIRST_AGG_QUEUE))
return;
if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
return;
iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
rcu_read_lock();
sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
mvmsta->tid_data[tid].rate_n_flags =
le32_to_cpu(tx_resp->initial_rate);
}
rcu_read_unlock();
}
int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
if (tx_resp->frame_count == 1)
iwl_mvm_rx_tx_cmd_single(mvm, pkt);
else
iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
return 0;
}
int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
struct sk_buff_head reclaimed_skbs;
struct iwl_mvm_tid_data *tid_data;
struct ieee80211_tx_info *info;
struct ieee80211_sta *sta;
struct iwl_mvm_sta *mvmsta;
struct ieee80211_hdr *hdr;
struct sk_buff *skb;
int sta_id, tid, freed;
/* "flow" corresponds to Tx queue */
u16 scd_flow = le16_to_cpu(ba_notif->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_notif->scd_ssn);
sta_id = ba_notif->sta_id;
tid = ba_notif->tid;
rcu_read_lock();
sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
/* Reclaiming frames for a station that has been deleted ? */
if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
rcu_read_unlock();
return 0;
}
mvmsta = (void *)sta->drv_priv;
tid_data = &mvmsta->tid_data[tid];
if (WARN_ONCE(tid_data->txq_id != scd_flow, "Q %d, tid %d, flow %d",
tid_data->txq_id, tid, scd_flow)) {
rcu_read_unlock();
return 0;
}
spin_lock_bh(&mvmsta->lock);
__skb_queue_head_init(&reclaimed_skbs);
/*
* 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).
*/
iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
&reclaimed_skbs);
IWL_DEBUG_TX_REPLY(mvm,
"BA_NOTIFICATION Received from %pM, sta_id = %d\n",
(u8 *)&ba_notif->sta_addr_lo32,
ba_notif->sta_id);
IWL_DEBUG_TX_REPLY(mvm,
"TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
(unsigned long long)le64_to_cpu(ba_notif->bitmap),
scd_flow, ba_resp_scd_ssn, ba_notif->txed,
ba_notif->txed_2_done);
tid_data->next_reclaimed = ba_resp_scd_ssn;
iwl_mvm_check_ratid_empty(mvm, sta, tid);
freed = 0;
skb_queue_walk(&reclaimed_skbs, skb) {
hdr = (struct ieee80211_hdr *)skb->data;
if (ieee80211_is_data_qos(hdr->frame_control))
freed++;
else
WARN_ON_ONCE(1);
info = IEEE80211_SKB_CB(skb);
iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
if (freed == 1) {
/* this is the first skb we deliver in this batch */
/* put the rate scaling data there */
info = IEEE80211_SKB_CB(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_notif->txed_2_done;
info->status.ampdu_len = ba_notif->txed;
iwl_mvm_hwrate_to_tx_control(tid_data->rate_n_flags,
info);
}
}
spin_unlock_bh(&mvmsta->lock);
rcu_read_unlock();
while (!skb_queue_empty(&reclaimed_skbs)) {
skb = __skb_dequeue(&reclaimed_skbs);
ieee80211_tx_status_ni(mvm->hw, skb);
}
return 0;
}
int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync)
{
int ret;
struct iwl_tx_path_flush_cmd flush_cmd = {
.queues_ctl = cpu_to_le32(tfd_msk),
.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
};
u32 flags = sync ? CMD_SYNC : CMD_ASYNC;
ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
sizeof(flush_cmd), &flush_cmd);
if (ret)
IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
return ret;
}
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