Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1699 commits)
  bnx2/bnx2x: Unsupported Ethtool operations should return -EINVAL.
  vlan: Calling vlan_hwaccel_do_receive() is always valid.
  tproxy: use the interface primary IP address as a default value for --on-ip
  tproxy: added IPv6 support to the socket match
  cxgb3: function namespace cleanup
  tproxy: added IPv6 support to the TPROXY target
  tproxy: added IPv6 socket lookup function to nf_tproxy_core
  be2net: Changes to use only priority codes allowed by f/w
  tproxy: allow non-local binds of IPv6 sockets if IP_TRANSPARENT is enabled
  tproxy: added tproxy sockopt interface in the IPV6 layer
  tproxy: added udp6_lib_lookup function
  tproxy: added const specifiers to udp lookup functions
  tproxy: split off ipv6 defragmentation to a separate module
  l2tp: small cleanup
  nf_nat: restrict ICMP translation for embedded header
  can: mcp251x: fix generation of error frames
  can: mcp251x: fix endless loop in interrupt handler if CANINTF_MERRF is set
  can-raw: add msg_flags to distinguish local traffic
  9p: client code cleanup
  rds: make local functions/variables static
  ...

Fix up conflicts in net/core/dev.c, drivers/net/pcmcia/smc91c92_cs.c and
drivers/net/wireless/ath/ath9k/debug.c as per David

1 files changed, 1335 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/carl9170/tx.c b/drivers/net/wireless/ath/carl9170/tx.c
new file mode 100644
index 000000000000..b575c865142d
--- /dev/null
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -0,0 +1,1335 @@
+/*
+ * Atheros CARL9170 driver
+ *
+ * 802.11 xmit & status routines
+ *
+ * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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; see the file COPYING.  If not, see
+ * http://www.gnu.org/licenses/.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *    Copyright (c) 2007-2008 Atheros Communications, Inc.
+ *
+ *    Permission to use, copy, modify, and/or distribute this software for any
+ *    purpose with or without fee is hereby granted, provided that the above
+ *    copyright notice and this permission notice appear in all copies.
+ *
+ *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <net/mac80211.h>
+#include "carl9170.h"
+#include "hw.h"
+#include "cmd.h"
+
+static inline unsigned int __carl9170_get_queue(struct ar9170 *ar,
+						unsigned int queue)
+{
+	if (unlikely(modparam_noht)) {
+		return queue;
+	} else {
+		/*
+		 * This is just another workaround, until
+		 * someone figures out how to get QoS and
+		 * AMPDU to play nicely together.
+		 */
+
+		return 2;		/* AC_BE */
+	}
+}
+
+static inline unsigned int carl9170_get_queue(struct ar9170 *ar,
+					      struct sk_buff *skb)
+{
+	return __carl9170_get_queue(ar, skb_get_queue_mapping(skb));
+}
+
+static bool is_mem_full(struct ar9170 *ar)
+{
+	return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) >
+		atomic_read(&ar->mem_free_blocks));
+}
+
+static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb)
+{
+	int queue, i;
+	bool mem_full;
+
+	atomic_inc(&ar->tx_total_queued);
+
+	queue = skb_get_queue_mapping(skb);
+	spin_lock_bh(&ar->tx_stats_lock);
+
+	/*
+	 * The driver has to accept the frame, regardless if the queue is
+	 * full to the brim, or not. We have to do the queuing internally,
+	 * since mac80211 assumes that a driver which can operate with
+	 * aggregated frames does not reject frames for this reason.
+	 */
+	ar->tx_stats[queue].len++;
+	ar->tx_stats[queue].count++;
+
+	mem_full = is_mem_full(ar);
+	for (i = 0; i < ar->hw->queues; i++) {
+		if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) {
+			ieee80211_stop_queue(ar->hw, i);
+			ar->queue_stop_timeout[i] = jiffies;
+		}
+	}
+
+	spin_unlock_bh(&ar->tx_stats_lock);
+}
+
+static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *txinfo;
+	int queue;
+
+	txinfo = IEEE80211_SKB_CB(skb);
+	queue = skb_get_queue_mapping(skb);
+
+	spin_lock_bh(&ar->tx_stats_lock);
+
+	ar->tx_stats[queue].len--;
+
+	if (!is_mem_full(ar)) {
+		unsigned int i;
+		for (i = 0; i < ar->hw->queues; i++) {
+			if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)
+				continue;
+
+			if (ieee80211_queue_stopped(ar->hw, i)) {
+				unsigned long tmp;
+
+				tmp = jiffies - ar->queue_stop_timeout[i];
+				if (tmp > ar->max_queue_stop_timeout[i])
+					ar->max_queue_stop_timeout[i] = tmp;
+			}
+
+			ieee80211_wake_queue(ar->hw, i);
+		}
+	}
+
+	spin_unlock_bh(&ar->tx_stats_lock);
+	if (atomic_dec_and_test(&ar->tx_total_queued))
+		complete(&ar->tx_flush);
+}
+
+static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct _carl9170_tx_superframe *super = (void *) skb->data;
+	unsigned int chunks;
+	int cookie = -1;
+
+	atomic_inc(&ar->mem_allocs);
+
+	chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);
+	if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {
+		atomic_add(chunks, &ar->mem_free_blocks);
+		return -ENOSPC;
+	}
+
+	spin_lock_bh(&ar->mem_lock);
+	cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0);
+	spin_unlock_bh(&ar->mem_lock);
+
+	if (unlikely(cookie < 0)) {
+		atomic_add(chunks, &ar->mem_free_blocks);
+		return -ENOSPC;
+	}
+
+	super = (void *) skb->data;
+
+	/*
+	 * Cookie #0 serves two special purposes:
+	 *  1. The firmware might use it generate BlockACK frames
+	 *     in responds of an incoming BlockAckReqs.
+	 *
+	 *  2. Prevent double-free bugs.
+	 */
+	super->s.cookie = (u8) cookie + 1;
+	return 0;
+}
+
+static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct _carl9170_tx_superframe *super = (void *) skb->data;
+	int cookie;
+
+	/* make a local copy of the cookie */
+	cookie = super->s.cookie;
+	/* invalidate cookie */
+	super->s.cookie = 0;
+
+	/*
+	 * Do a out-of-bounds check on the cookie:
+	 *
+	 *  * cookie "0" is reserved and won't be assigned to any
+	 *    out-going frame. Internally however, it is used to
+	 *    mark no longer/un-accounted frames and serves as a
+	 *    cheap way of preventing frames from being freed
+	 *    twice by _accident_. NB: There is a tiny race...
+	 *
+	 *  * obviously, cookie number is limited by the amount
+	 *    of available memory blocks, so the number can
+	 *    never execeed the mem_blocks count.
+	 */
+	if (unlikely(WARN_ON_ONCE(cookie == 0) ||
+	    WARN_ON_ONCE(cookie > ar->fw.mem_blocks)))
+		return;
+
+	atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),
+		   &ar->mem_free_blocks);
+
+	spin_lock_bh(&ar->mem_lock);
+	bitmap_release_region(ar->mem_bitmap, cookie - 1, 0);
+	spin_unlock_bh(&ar->mem_lock);
+}
+
+/* Called from any context */
+static void carl9170_tx_release(struct kref *ref)
+{
+	struct ar9170 *ar;
+	struct carl9170_tx_info *arinfo;
+	struct ieee80211_tx_info *txinfo;
+	struct sk_buff *skb;
+
+	arinfo = container_of(ref, struct carl9170_tx_info, ref);
+	txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,
+			      rate_driver_data);
+	skb = container_of((void *) txinfo, struct sk_buff, cb);
+
+	ar = arinfo->ar;
+	if (WARN_ON_ONCE(!ar))
+		return;
+
+	BUILD_BUG_ON(
+	    offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
+
+	memset(&txinfo->status.ampdu_ack_len, 0,
+	       sizeof(struct ieee80211_tx_info) -
+	       offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
+
+	if (atomic_read(&ar->tx_total_queued))
+		ar->tx_schedule = true;
+
+	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {
+		if (!atomic_read(&ar->tx_ampdu_upload))
+			ar->tx_ampdu_schedule = true;
+
+		if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {
+			txinfo->status.ampdu_len = txinfo->pad[0];
+			txinfo->status.ampdu_ack_len = txinfo->pad[1];
+			txinfo->pad[0] = txinfo->pad[1] = 0;
+		} else if (txinfo->flags & IEEE80211_TX_STAT_ACK) {
+			/*
+			 * drop redundant tx_status reports:
+			 *
+			 * 1. ampdu_ack_len of the final tx_status does
+			 *    include the feedback of this particular frame.
+			 *
+			 * 2. tx_status_irqsafe only queues up to 128
+			 *    tx feedback reports and discards the rest.
+			 *
+			 * 3. minstrel_ht is picky, it only accepts
+			 *    reports of frames with the TX_STATUS_AMPDU flag.
+			 */
+
+			dev_kfree_skb_any(skb);
+			return;
+		} else {
+			/*
+			 * Frame has failed, but we want to keep it in
+			 * case it was lost due to a power-state
+			 * transition.
+			 */
+		}
+	}
+
+	skb_pull(skb, sizeof(struct _carl9170_tx_superframe));
+	ieee80211_tx_status_irqsafe(ar->hw, skb);
+}
+
+void carl9170_tx_get_skb(struct sk_buff *skb)
+{
+	struct carl9170_tx_info *arinfo = (void *)
+		(IEEE80211_SKB_CB(skb))->rate_driver_data;
+	kref_get(&arinfo->ref);
+}
+
+int carl9170_tx_put_skb(struct sk_buff *skb)
+{
+	struct carl9170_tx_info *arinfo = (void *)
+		(IEEE80211_SKB_CB(skb))->rate_driver_data;
+
+	return kref_put(&arinfo->ref, carl9170_tx_release);
+}
+
+/* Caller must hold the tid_info->lock & rcu_read_lock */
+static void carl9170_tx_shift_bm(struct ar9170 *ar,
+	struct carl9170_sta_tid *tid_info, u16 seq)
+{
+	u16 off;
+
+	off = SEQ_DIFF(seq, tid_info->bsn);
+
+	if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
+		return;
+
+	/*
+	 * Sanity check. For each MPDU we set the bit in bitmap and
+	 * clear it once we received the tx_status.
+	 * But if the bit is already cleared then we've been bitten
+	 * by a bug.
+	 */
+	WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
+
+	off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
+	if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
+		return;
+
+	if (!bitmap_empty(tid_info->bitmap, off))
+		off = find_first_bit(tid_info->bitmap, off);
+
+	tid_info->bsn += off;
+	tid_info->bsn &= 0x0fff;
+
+	bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,
+			   off, CARL9170_BAW_BITS);
+}
+
+static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
+	struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
+{
+	struct _carl9170_tx_superframe *super = (void *) skb->data;
+	struct ieee80211_hdr *hdr = (void *) super->frame_data;
+	struct ieee80211_tx_info *tx_info;
+	struct carl9170_tx_info *ar_info;
+	struct carl9170_sta_info *sta_info;
+	struct ieee80211_sta *sta;
+	struct carl9170_sta_tid *tid_info;
+	struct ieee80211_vif *vif;
+	unsigned int vif_id;
+	u8 tid;
+
+	if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
+	    txinfo->flags & IEEE80211_TX_CTL_INJECTED)
+		return;
+
+	tx_info = IEEE80211_SKB_CB(skb);
+	ar_info = (void *) tx_info->rate_driver_data;
+
+	vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
+		 CARL9170_TX_SUPER_MISC_VIF_ID_S;
+
+	if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))
+		return;
+
+	rcu_read_lock();
+	vif = rcu_dereference(ar->vif_priv[vif_id].vif);
+	if (unlikely(!vif))
+		goto out_rcu;
+
+	/*
+	 * Normally we should use wrappers like ieee80211_get_DA to get
+	 * the correct peer ieee80211_sta.
+	 *
+	 * But there is a problem with indirect traffic (broadcasts, or
+	 * data which is designated for other stations) in station mode.
+	 * The frame will be directed to the AP for distribution and not
+	 * to the actual destination.
+	 */
+	sta = ieee80211_find_sta(vif, hdr->addr1);
+	if (unlikely(!sta))
+		goto out_rcu;
+
+	tid = get_tid_h(hdr);
+
+	sta_info = (void *) sta->drv_priv;
+	tid_info = rcu_dereference(sta_info->agg[tid]);
+	if (!tid_info)
+		goto out_rcu;
+
+	spin_lock_bh(&tid_info->lock);
+	if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
+		carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));
+
+	if (sta_info->stats[tid].clear) {
+		sta_info->stats[tid].clear = false;
+		sta_info->stats[tid].ampdu_len = 0;
+		sta_info->stats[tid].ampdu_ack_len = 0;
+	}
+
+	sta_info->stats[tid].ampdu_len++;
+	if (txinfo->status.rates[0].count == 1)
+		sta_info->stats[tid].ampdu_ack_len++;
+
+	if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
+		txinfo->pad[0] = sta_info->stats[tid].ampdu_len;
+		txinfo->pad[1] = sta_info->stats[tid].ampdu_ack_len;
+		txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
+		sta_info->stats[tid].clear = true;
+	}
+	spin_unlock_bh(&tid_info->lock);
+
+out_rcu:
+	rcu_read_unlock();
+}
+
+void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
+			const bool success)
+{
+	struct ieee80211_tx_info *txinfo;
+
+	carl9170_tx_accounting_free(ar, skb);
+
+	txinfo = IEEE80211_SKB_CB(skb);
+
+	if (success)
+		txinfo->flags |= IEEE80211_TX_STAT_ACK;
+	else
+		ar->tx_ack_failures++;
+
+	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
+		carl9170_tx_status_process_ampdu(ar, skb, txinfo);
+
+	carl9170_tx_put_skb(skb);
+}
+
+/* This function may be called form any context */
+void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
+
+	atomic_dec(&ar->tx_total_pending);
+
+	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
+		atomic_dec(&ar->tx_ampdu_upload);
+
+	if (carl9170_tx_put_skb(skb))
+		tasklet_hi_schedule(&ar->usb_tasklet);
+}
+
+static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
+					       struct sk_buff_head *queue)
+{
+	struct sk_buff *skb;
+
+	spin_lock_bh(&queue->lock);
+	skb_queue_walk(queue, skb) {
+		struct _carl9170_tx_superframe *txc = (void *) skb->data;
+
+		if (txc->s.cookie != cookie)
+			continue;
+
+		__skb_unlink(skb, queue);
+		spin_unlock_bh(&queue->lock);
+
+		carl9170_release_dev_space(ar, skb);
+		return skb;
+	}
+	spin_unlock_bh(&queue->lock);
+
+	return NULL;
+}
+
+static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
+	unsigned int tries, struct ieee80211_tx_info *txinfo)
+{
+	unsigned int i;
+
+	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+		if (txinfo->status.rates[i].idx < 0)
+			break;
+
+		if (i == rix) {
+			txinfo->status.rates[i].count = tries;
+			i++;
+			break;
+		}
+	}
+
+	for (; i < IEEE80211_TX_MAX_RATES; i++) {
+		txinfo->status.rates[i].idx = -1;
+		txinfo->status.rates[i].count = 0;
+	}
+}
+
+static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
+{
+	int i;
+	struct sk_buff *skb;
+	struct ieee80211_tx_info *txinfo;
+	struct carl9170_tx_info *arinfo;
+	bool restart = false;
+
+	for (i = 0; i < ar->hw->queues; i++) {
+		spin_lock_bh(&ar->tx_status[i].lock);
+
+		skb = skb_peek(&ar->tx_status[i]);
+
+		if (!skb)
+			goto next;
+
+		txinfo = IEEE80211_SKB_CB(skb);
+		arinfo = (void *) txinfo->rate_driver_data;
+
+		if (time_is_before_jiffies(arinfo->timeout +
+		    msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
+			restart = true;
+
+next:
+		spin_unlock_bh(&ar->tx_status[i].lock);
+	}
+
+	if (restart) {
+		/*
+		 * At least one queue has been stuck for long enough.
+		 * Give the device a kick and hope it gets back to
+		 * work.
+		 *
+		 * possible reasons may include:
+		 *  - frames got lost/corrupted (bad connection to the device)
+		 *  - stalled rx processing/usb controller hiccups
+		 *  - firmware errors/bugs
+		 *  - every bug you can think of.
+		 *  - all bugs you can't...
+		 *  - ...
+		 */
+		carl9170_restart(ar, CARL9170_RR_STUCK_TX);
+	}
+}
+
+void carl9170_tx_janitor(struct work_struct *work)
+{
+	struct ar9170 *ar = container_of(work, struct ar9170,
+					 tx_janitor.work);
+	if (!IS_STARTED(ar))
+		return;
+
+	ar->tx_janitor_last_run = jiffies;
+
+	carl9170_check_queue_stop_timeout(ar);
+
+	if (!atomic_read(&ar->tx_total_queued))
+		return;
+
+	ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
+		msecs_to_jiffies(CARL9170_TX_TIMEOUT));
+}
+
+static void __carl9170_tx_process_status(struct ar9170 *ar,
+	const uint8_t cookie, const uint8_t info)
+{
+	struct sk_buff *skb;
+	struct ieee80211_tx_info *txinfo;
+	struct carl9170_tx_info *arinfo;
+	unsigned int r, t, q;
+	bool success = true;
+
+	q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE];
+
+	skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);
+	if (!skb) {
+		/*
+		 * We have lost the race to another thread.
+		 */
+
+		return ;
+	}
+
+	txinfo = IEEE80211_SKB_CB(skb);
+	arinfo = (void *) txinfo->rate_driver_data;
+
+	if (!(info & CARL9170_TX_STATUS_SUCCESS))
+		success = false;
+
+	r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
+	t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
+
+	carl9170_tx_fill_rateinfo(ar, r, t, txinfo);
+	carl9170_tx_status(ar, skb, success);
+}
+
+void carl9170_tx_process_status(struct ar9170 *ar,
+				const struct carl9170_rsp *cmd)
+{
+	unsigned int i;
+
+	for (i = 0;  i < cmd->hdr.ext; i++) {
+		if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
+			print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
+					     (void *) cmd, cmd->hdr.len + 4);
+			break;
+		}
+
+		__carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,
+					     cmd->_tx_status[i].info);
+	}
+}
+
+static __le32 carl9170_tx_physet(struct ar9170 *ar,
+	struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
+{
+	struct ieee80211_rate *rate = NULL;
+	u32 power, chains;
+	__le32 tmp;
+
+	tmp = cpu_to_le32(0);
+
+	if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+		tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
+			AR9170_TX_PHY_BW_S);
+	/* this works because 40 MHz is 2 and dup is 3 */
+	if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
+		tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
+			AR9170_TX_PHY_BW_S);
+
+	if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
+		tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
+
+	if (txrate->flags & IEEE80211_TX_RC_MCS) {
+		u32 r = txrate->idx;
+		u8 *txpower;
+
+		/* heavy clip control */
+		tmp |= cpu_to_le32((r & 0x7) <<
+			AR9170_TX_PHY_TX_HEAVY_CLIP_S);
+
+		if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
+			if (info->band == IEEE80211_BAND_5GHZ)
+				txpower = ar->power_5G_ht40;
+			else
+				txpower = ar->power_2G_ht40;
+		} else {
+			if (info->band == IEEE80211_BAND_5GHZ)
+				txpower = ar->power_5G_ht20;
+			else
+				txpower = ar->power_2G_ht20;
+		}
+
+		power = txpower[r & 7];
+
+		/* +1 dBm for HT40 */
+		if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+			power += 2;
+
+		r <<= AR9170_TX_PHY_MCS_S;
+		BUG_ON(r & ~AR9170_TX_PHY_MCS);
+
+		tmp |= cpu_to_le32(r & AR9170_TX_PHY_MCS);
+		tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
+
+		/*
+		 * green field preamble does not work.
+		 *
+		 * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
+		 * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
+		 */
+	} else {
+		u8 *txpower;
+		u32 mod;
+		u32 phyrate;
+		u8 idx = txrate->idx;
+
+		if (info->band != IEEE80211_BAND_2GHZ) {
+			idx += 4;
+			txpower = ar->power_5G_leg;
+			mod = AR9170_TX_PHY_MOD_OFDM;
+		} else {
+			if (idx < 4) {
+				txpower = ar->power_2G_cck;
+				mod = AR9170_TX_PHY_MOD_CCK;
+			} else {
+				mod = AR9170_TX_PHY_MOD_OFDM;
+				txpower = ar->power_2G_ofdm;
+			}
+		}
+
+		rate = &__carl9170_ratetable[idx];
+
+		phyrate = rate->hw_value & 0xF;
+		power = txpower[(rate->hw_value & 0x30) >> 4];
+		phyrate <<= AR9170_TX_PHY_MCS_S;
+
+		tmp |= cpu_to_le32(mod);
+		tmp |= cpu_to_le32(phyrate);
+
+		/*
+		 * short preamble seems to be broken too.
+		 *
+		 * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+		 *	tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
+		 */
+	}
+	power <<= AR9170_TX_PHY_TX_PWR_S;
+	power &= AR9170_TX_PHY_TX_PWR;
+	tmp |= cpu_to_le32(power);
+
+	/* set TX chains */
+	if (ar->eeprom.tx_mask == 1) {
+		chains = AR9170_TX_PHY_TXCHAIN_1;
+	} else {
+		chains = AR9170_TX_PHY_TXCHAIN_2;
+
+		/* >= 36M legacy OFDM - use only one chain */
+		if (rate && rate->bitrate >= 360 &&
+		    !(txrate->flags & IEEE80211_TX_RC_MCS))
+			chains = AR9170_TX_PHY_TXCHAIN_1;
+	}
+	tmp |= cpu_to_le32(chains << AR9170_TX_PHY_TXCHAIN_S);
+
+	return tmp;
+}
+
+static bool carl9170_tx_rts_check(struct ar9170 *ar,
+				  struct ieee80211_tx_rate *rate,
+				  bool ampdu, bool multi)
+{
+	switch (ar->erp_mode) {
+	case CARL9170_ERP_AUTO:
+		if (ampdu)
+			break;
+
+	case CARL9170_ERP_MAC80211:
+		if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
+			break;
+
+	case CARL9170_ERP_RTS:
+		if (likely(!multi))
+			return true;
+
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static bool carl9170_tx_cts_check(struct ar9170 *ar,
+				  struct ieee80211_tx_rate *rate)
+{
+	switch (ar->erp_mode) {
+	case CARL9170_ERP_AUTO:
+	case CARL9170_ERP_MAC80211:
+		if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
+			break;
+
+	case CARL9170_ERP_CTS:
+		return true;
+
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static int carl9170_tx_prepare(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr;
+	struct _carl9170_tx_superframe *txc;
+	struct carl9170_vif_info *cvif;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_tx_rate *txrate;
+	struct ieee80211_sta *sta;
+	struct carl9170_tx_info *arinfo;
+	unsigned int hw_queue;
+	int i;
+	__le16 mac_tmp;
+	u16 len;
+	bool ampdu, no_ack;
+
+	BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
+	BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
+		     CARL9170_TX_SUPERDESC_LEN);
+
+	BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
+		     AR9170_TX_HWDESC_LEN);
+
+	BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
+
+	BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
+		((CARL9170_TX_SUPER_MISC_VIF_ID >>
+		 CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
+
+	hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)];
+
+	hdr = (void *)skb->data;
+	info = IEEE80211_SKB_CB(skb);
+	len = skb->len;
+
+	/*
+	 * Note: If the frame was sent through a monitor interface,
+	 * the ieee80211_vif pointer can be NULL.
+	 */
+	if (likely(info->control.vif))
+		cvif = (void *) info->control.vif->drv_priv;
+	else
+		cvif = NULL;
+
+	sta = info->control.sta;
+
+	txc = (void *)skb_push(skb, sizeof(*txc));
+	memset(txc, 0, sizeof(*txc));
+
+	SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
+
+	if (likely(cvif))
+		SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
+
+	if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
+		txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
+
+	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
+		txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
+
+	mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
+			      AR9170_TX_MAC_BACKOFF);
+	mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &&
+			       AR9170_TX_MAC_QOS);
+
+	no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
+	if (unlikely(no_ack))
+		mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
+
+	if (info->control.hw_key) {
+		len += info->control.hw_key->icv_len;
+
+		switch (info->control.hw_key->cipher) {
+		case WLAN_CIPHER_SUITE_WEP40:
+		case WLAN_CIPHER_SUITE_WEP104:
+		case WLAN_CIPHER_SUITE_TKIP:
+			mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
+			break;
+		case WLAN_CIPHER_SUITE_CCMP:
+			mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
+			break;
+		default:
+			WARN_ON(1);
+			goto err_out;
+		}
+	}
+
+	ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
+	if (ampdu) {
+		unsigned int density, factor;
+
+		if (unlikely(!sta || !cvif))
+			goto err_out;
+
+		factor = min_t(unsigned int, 1u,
+			 info->control.sta->ht_cap.ampdu_factor);
+
+		density = info->control.sta->ht_cap.ampdu_density;
+
+		if (density) {
+			/*
+			 * Watch out!
+			 *
+			 * Otus uses slightly different density values than
+			 * those from the 802.11n spec.
+			 */
+
+			density = max_t(unsigned int, density + 1, 7u);
+		}
+
+		SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
+			txc->s.ampdu_settings, density);
+
+		SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
+			txc->s.ampdu_settings, factor);
+
+		for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
+			txrate = &info->control.rates[i];
+			if (txrate->idx >= 0) {
+				txc->s.ri[i] =
+					CARL9170_TX_SUPER_RI_AMPDU;
+
+				if (WARN_ON(!(txrate->flags &
+					      IEEE80211_TX_RC_MCS))) {
+					/*
+					 * Not sure if it's even possible
+					 * to aggregate non-ht rates with
+					 * this HW.
+					 */
+					goto err_out;
+				}
+				continue;
+			}
+
+			txrate->idx = 0;
+			txrate->count = ar->hw->max_rate_tries;
+		}
+
+		mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
+	}
+
+	/*
+	 * NOTE: For the first rate, the ERP & AMPDU flags are directly
+	 * taken from mac_control. For all fallback rate, the firmware
+	 * updates the mac_control flags from the rate info field.
+	 */
+	for (i = 1; i < CARL9170_TX_MAX_RATES; i++) {
+		txrate = &info->control.rates[i];
+		if (txrate->idx < 0)
+			break;
+
+		SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
+			txrate->count);
+
+		if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
+			txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
+				CARL9170_TX_SUPER_RI_ERP_PROT_S);
+		else if (carl9170_tx_cts_check(ar, txrate))
+			txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
+				CARL9170_TX_SUPER_RI_ERP_PROT_S);
+
+		txc->s.rr[i - 1] = carl9170_tx_physet(ar, info, txrate);
+	}
+
+	txrate = &info->control.rates[0];
+	SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[0], txrate->count);
+
+	if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
+		mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
+	else if (carl9170_tx_cts_check(ar, txrate))
+		mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
+
+	txc->s.len = cpu_to_le16(skb->len);
+	txc->f.length = cpu_to_le16(len + FCS_LEN);
+	txc->f.mac_control = mac_tmp;
+	txc->f.phy_control = carl9170_tx_physet(ar, info, txrate);
+
+	arinfo = (void *)info->rate_driver_data;
+	arinfo->timeout = jiffies;
+	arinfo->ar = ar;
+	kref_init(&arinfo->ref);
+	return 0;
+
+err_out:
+	skb_pull(skb, sizeof(*txc));
+	return -EINVAL;
+}
+
+static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct _carl9170_tx_superframe *super;
+
+	super = (void *) skb->data;
+	super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
+}
+
+static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct _carl9170_tx_superframe *super;
+	int tmp;
+
+	super = (void *) skb->data;
+
+	tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
+		CARL9170_TX_SUPER_AMPDU_DENSITY_S;
+
+	/*
+	 * If you haven't noticed carl9170_tx_prepare has already filled
+	 * in all ampdu spacing & factor parameters.
+	 * Now it's the time to check whenever the settings have to be
+	 * updated by the firmware, or if everything is still the same.
+	 *
+	 * There's no sane way to handle different density values with
+	 * this hardware, so we may as well just do the compare in the
+	 * driver.
+	 */
+
+	if (tmp != ar->current_density) {
+		ar->current_density = tmp;
+		super->s.ampdu_settings |=
+			CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
+	}
+
+	tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
+		CARL9170_TX_SUPER_AMPDU_FACTOR_S;
+
+	if (tmp != ar->current_factor) {
+		ar->current_factor = tmp;
+		super->s.ampdu_settings |=
+			CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
+	}
+}
+
+static bool carl9170_tx_rate_check(struct ar9170 *ar, struct sk_buff *_dest,
+				   struct sk_buff *_src)
+{
+	struct _carl9170_tx_superframe *dest, *src;
+
+	dest = (void *) _dest->data;
+	src = (void *) _src->data;
+
+	/*
+	 * The mac80211 rate control algorithm expects that all MPDUs in
+	 * an AMPDU share the same tx vectors.
+	 * This is not really obvious right now, because the hardware
+	 * does the AMPDU setup according to its own rulebook.
+	 * Our nicely assembled, strictly monotonic increasing mpdu
+	 * chains will be broken up, mashed back together...
+	 */
+
+	return (dest->f.phy_control == src->f.phy_control);
+}
+
+static void carl9170_tx_ampdu(struct ar9170 *ar)
+{
+	struct sk_buff_head agg;
+	struct carl9170_sta_tid *tid_info;
+	struct sk_buff *skb, *first;
+	unsigned int i = 0, done_ampdus = 0;
+	u16 seq, queue, tmpssn;
+
+	atomic_inc(&ar->tx_ampdu_scheduler);
+	ar->tx_ampdu_schedule = false;
+
+	if (atomic_read(&ar->tx_ampdu_upload))
+		return;
+
+	if (!ar->tx_ampdu_list_len)
+		return;
+
+	__skb_queue_head_init(&agg);
+
+	rcu_read_lock();
+	tid_info = rcu_dereference(ar->tx_ampdu_iter);
+	if (WARN_ON_ONCE(!tid_info)) {
+		rcu_read_unlock();
+		return;
+	}
+
+retry:
+	list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
+		i++;
+
+		if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
+			continue;
+
+		queue = TID_TO_WME_AC(tid_info->tid);
+
+		spin_lock_bh(&tid_info->lock);
+		if (tid_info->state != CARL9170_TID_STATE_XMIT)
+			goto processed;
+
+		tid_info->counter++;
+		first = skb_peek(&tid_info->queue);
+		tmpssn = carl9170_get_seq(first);
+		seq = tid_info->snx;
+
+		if (unlikely(tmpssn != seq)) {
+			tid_info->state = CARL9170_TID_STATE_IDLE;
+
+			goto processed;
+		}
+
+		while ((skb = skb_peek(&tid_info->queue))) {
+			/* strict 0, 1, ..., n - 1, n frame sequence order */
+			if (unlikely(carl9170_get_seq(skb) != seq))
+				break;
+
+			/* don't upload more than AMPDU FACTOR allows. */
+			if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
+			    (tid_info->max - 1)))
+				break;
+
+			if (!carl9170_tx_rate_check(ar, skb, first))
+				break;
+
+			atomic_inc(&ar->tx_ampdu_upload);
+			tid_info->snx = seq = SEQ_NEXT(seq);
+			__skb_unlink(skb, &tid_info->queue);
+
+			__skb_queue_tail(&agg, skb);
+
+			if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)
+				break;
+		}
+
+		if (skb_queue_empty(&tid_info->queue) ||
+		    carl9170_get_seq(skb_peek(&tid_info->queue)) !=
+		    tid_info->snx) {
+			/*
+			 * stop TID, if A-MPDU frames are still missing,
+			 * or whenever the queue is empty.
+			 */
+
+			tid_info->state = CARL9170_TID_STATE_IDLE;
+		}
+		done_ampdus++;
+
+processed:
+		spin_unlock_bh(&tid_info->lock);
+
+		if (skb_queue_empty(&agg))
+			continue;
+
+		/* apply ampdu spacing & factor settings */
+		carl9170_set_ampdu_params(ar, skb_peek(&agg));
+
+		/* set aggregation push bit */
+		carl9170_set_immba(ar, skb_peek_tail(&agg));
+
+		spin_lock_bh(&ar->tx_pending[queue].lock);
+		skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);
+		spin_unlock_bh(&ar->tx_pending[queue].lock);
+		ar->tx_schedule = true;
+	}
+	if ((done_ampdus++ == 0) && (i++ == 0))
+		goto retry;
+
+	rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
+	rcu_read_unlock();
+}
+
+static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
+					    struct sk_buff_head *queue)
+{
+	struct sk_buff *skb;
+	struct ieee80211_tx_info *info;
+	struct carl9170_tx_info *arinfo;
+
+	BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
+
+	spin_lock_bh(&queue->lock);
+	skb = skb_peek(queue);
+	if (unlikely(!skb))
+		goto err_unlock;
+
+	if (carl9170_alloc_dev_space(ar, skb))
+		goto err_unlock;
+
+	__skb_unlink(skb, queue);
+	spin_unlock_bh(&queue->lock);
+
+	info = IEEE80211_SKB_CB(skb);
+	arinfo = (void *) info->rate_driver_data;
+
+	arinfo->timeout = jiffies;
+
+	/*
+	 * increase ref count to "2".
+	 * Ref counting is the easiest way to solve the race between
+	 * the the urb's completion routine: carl9170_tx_callback and
+	 * wlan tx status functions: carl9170_tx_status/janitor.
+	 */
+	carl9170_tx_get_skb(skb);
+
+	return skb;
+
+err_unlock:
+	spin_unlock_bh(&queue->lock);
+	return NULL;
+}
+
+void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
+{
+	struct _carl9170_tx_superframe *super;
+	uint8_t q = 0;
+
+	ar->tx_dropped++;
+
+	super = (void *)skb->data;
+	SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
+		ar9170_qmap[carl9170_get_queue(ar, skb)]);
+	__carl9170_tx_process_status(ar, super->s.cookie, q);
+}
+
+static void carl9170_tx(struct ar9170 *ar)
+{
+	struct sk_buff *skb;
+	unsigned int i, q;
+	bool schedule_garbagecollector = false;
+
+	ar->tx_schedule = false;
+
+	if (unlikely(!IS_STARTED(ar)))
+		return;
+
+	carl9170_usb_handle_tx_err(ar);
+
+	for (i = 0; i < ar->hw->queues; i++) {
+		while (!skb_queue_empty(&ar->tx_pending[i])) {
+			skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);
+			if (unlikely(!skb))
+				break;
+
+			atomic_inc(&ar->tx_total_pending);
+
+			q = __carl9170_get_queue(ar, i);
+			/*
+			 * NB: tx_status[i] vs. tx_status[q],
+			 * TODO: Move into pick_skb or alloc_dev_space.
+			 */
+			skb_queue_tail(&ar->tx_status[q], skb);
+
+			carl9170_usb_tx(ar, skb);
+			schedule_garbagecollector = true;
+		}
+	}
+
+	if (!schedule_garbagecollector)
+		return;
+
+	ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,
+		msecs_to_jiffies(CARL9170_TX_TIMEOUT));
+}
+
+static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
+	struct ieee80211_sta *sta, struct sk_buff *skb)
+{
+	struct carl9170_sta_info *sta_info;
+	struct carl9170_sta_tid *agg;
+	struct sk_buff *iter;
+	unsigned int max;
+	u16 tid, seq, qseq, off;
+	bool run = false;
+
+	tid = carl9170_get_tid(skb);
+	seq = carl9170_get_seq(skb);
+	sta_info = (void *) sta->drv_priv;
+
+	rcu_read_lock();
+	agg = rcu_dereference(sta_info->agg[tid]);
+	max = sta_info->ampdu_max_len;
+
+	if (!agg)
+		goto err_unlock_rcu;
+
+	spin_lock_bh(&agg->lock);
+	if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
+		goto err_unlock;
+
+	/* check if sequence is within the BA window */
+	if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
+		goto err_unlock;
+
+	if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
+		goto err_unlock;
+
+	off = SEQ_DIFF(seq, agg->bsn);
+	if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
+		goto err_unlock;
+
+	if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
+		__skb_queue_tail(&agg->queue, skb);
+		agg->hsn = seq;
+		goto queued;
+	}
+
+	skb_queue_reverse_walk(&agg->queue, iter) {
+		qseq = carl9170_get_seq(iter);
+
+		if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
+			__skb_queue_after(&agg->queue, iter, skb);
+			goto queued;
+		}
+	}
+
+	__skb_queue_head(&agg->queue, skb);
+queued:
+
+	if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
+		if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {
+			agg->state = CARL9170_TID_STATE_XMIT;
+			run = true;
+		}
+	}
+
+	spin_unlock_bh(&agg->lock);
+	rcu_read_unlock();
+
+	return run;
+
+err_unlock:
+	spin_unlock_bh(&agg->lock);
+
+err_unlock_rcu:
+	rcu_read_unlock();
+	carl9170_tx_status(ar, skb, false);
+	ar->tx_dropped++;
+	return false;
+}
+
+int carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+	struct ar9170 *ar = hw->priv;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_sta *sta;
+	bool run;
+
+	if (unlikely(!IS_STARTED(ar)))
+		goto err_free;
+
+	info = IEEE80211_SKB_CB(skb);
+	sta = info->control.sta;
+
+	if (unlikely(carl9170_tx_prepare(ar, skb)))
+		goto err_free;
+
+	carl9170_tx_accounting(ar, skb);
+	/*
+	 * from now on, one has to use carl9170_tx_status to free
+	 * all ressouces which are associated with the frame.
+	 */
+
+	if (info->flags & IEEE80211_TX_CTL_AMPDU) {
+		if (WARN_ON_ONCE(!sta))
+			goto err_free;
+
+		run = carl9170_tx_ampdu_queue(ar, sta, skb);
+		if (run)
+			carl9170_tx_ampdu(ar);
+
+	} else {
+		unsigned int queue = skb_get_queue_mapping(skb);
+
+		skb_queue_tail(&ar->tx_pending[queue], skb);
+	}
+
+	carl9170_tx(ar);
+	return NETDEV_TX_OK;
+
+err_free:
+	ar->tx_dropped++;
+	dev_kfree_skb_any(skb);
+	return NETDEV_TX_OK;
+}
+
+void carl9170_tx_scheduler(struct ar9170 *ar)
+{
+
+	if (ar->tx_ampdu_schedule)
+		carl9170_tx_ampdu(ar);
+
+	if (ar->tx_schedule)
+		carl9170_tx(ar);
+}