p54: Move TX/RX code (0a5fb84f) · Commits · jan.koester / Linux

drivers/net/wireless/p54/txrx.c

0 → 100644

+825 −0

Original line number	Diff line number	Diff line
		/*
		* Common code for mac80211 Prism54 drivers
		*
		* Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
		* Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
		* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
		*
		* Based on:
		* - the islsm (softmac prism54) driver, which is:
		* Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
		* - stlc45xx driver
		* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/init.h>
		#include <linux/firmware.h>
		#include <linux/etherdevice.h>

		#include <net/mac80211.h>

		#include "p54.h"
		#include "lmac.h"

		#ifdef P54_MM_DEBUG
		static void p54_dump_tx_queue(struct p54_common *priv)
		{
		unsigned long flags;
		struct ieee80211_tx_info *info;
		struct p54_tx_info *range;
		struct sk_buff *skb;
		struct p54_hdr *hdr;
		unsigned int i = 0;
		u32 prev_addr;
		u32 largest_hole = 0, free;

		spin_lock_irqsave(&priv->tx_queue.lock, flags);
		printk(KERN_DEBUG "%s: / --- tx queue dump (%d entries) --- \n",
		wiphy_name(priv->hw->wiphy), skb_queue_len(&priv->tx_queue));

		prev_addr = priv->rx_start;
		skb_queue_walk(&priv->tx_queue, skb) {
		info = IEEE80211_SKB_CB(skb);
		range = (void *) info->rate_driver_data;
		hdr = (void *) skb->data;

		free = range->start_addr - prev_addr;
		printk(KERN_DEBUG "%s: \| [%02d] => [skb:%p skb_len:0x%04x "
		"hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
		"mem:{start:%04x end:%04x, free:%d}]\n",
		wiphy_name(priv->hw->wiphy), i++, skb, skb->len,
		le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
		le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
		range->start_addr, range->end_addr, free);

		prev_addr = range->end_addr;
		largest_hole = max(largest_hole, free);
		}
		free = priv->rx_end - prev_addr;
		largest_hole = max(largest_hole, free);
		printk(KERN_DEBUG "%s: \\ --- [free: %d], largest free block: %d ---\n",
		wiphy_name(priv->hw->wiphy), free, largest_hole);
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		}
		#endif /* P54_MM_DEBUG */

		/*
		* So, the firmware is somewhat stupid and doesn't know what places in its
		* memory incoming data should go to. By poking around in the firmware, we
		* can find some unused memory to upload our packets to. However, data that we
		* want the card to TX needs to stay intact until the card has told us that
		* it is done with it. This function finds empty places we can upload to and
		* marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
		* p54_free_skb frees allocated areas.
		*/
		static int p54_assign_address(struct p54_common priv, struct sk_buff skb)
		{
		struct sk_buff entry, target_skb = NULL;
		struct ieee80211_tx_info *info;
		struct p54_tx_info *range;
		struct p54_hdr data = (void ) skb->data;
		unsigned long flags;
		u32 last_addr = priv->rx_start;
		u32 target_addr = priv->rx_start;
		u16 len = priv->headroom + skb->len + priv->tailroom + 3;

		if (unlikely(WARN_ON(!skb \|\| !priv)))
		return -EINVAL;

		info = IEEE80211_SKB_CB(skb);
		range = (void *) info->rate_driver_data;
		len = (range->extra_len + len) & ~0x3;

		spin_lock_irqsave(&priv->tx_queue.lock, flags);
		if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
		/*
		* The tx_queue is now really full.
		*
		* TODO: check if the device has crashed and reset it.
		*/
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		return -EBUSY;
		}

		skb_queue_walk(&priv->tx_queue, entry) {
		u32 hole_size;
		info = IEEE80211_SKB_CB(entry);
		range = (void *) info->rate_driver_data;
		hole_size = range->start_addr - last_addr;

		if (!entry->next) {
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		return -ENOSPC;
		}

		if (!target_skb && hole_size >= len) {
		target_skb = entry->prev;
		hole_size -= len;
		target_addr = last_addr;
		break;
		}
		last_addr = range->end_addr;
		}
		if (unlikely(!target_skb)) {
		if (priv->rx_end - last_addr >= len) {
		target_skb = priv->tx_queue.prev;
		if (!skb_queue_empty(&priv->tx_queue)) {
		info = IEEE80211_SKB_CB(target_skb);
		range = (void *)info->rate_driver_data;
		target_addr = range->end_addr;
		}
		} else {
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		return -ENOSPC;
		}
		}

		info = IEEE80211_SKB_CB(skb);
		range = (void *) info->rate_driver_data;
		range->start_addr = target_addr;
		range->end_addr = target_addr + len;
		__skb_queue_after(&priv->tx_queue, target_skb, skb);
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		data->req_id = cpu_to_le32(target_addr + priv->headroom);
		return 0;
		}

		static void p54_tx_pending(struct p54_common *priv)
		{
		struct sk_buff *skb;
		int ret;

		if (unlikely(WARN_ON(!priv)))
		return ;

		skb = skb_dequeue(&priv->tx_pending);
		if (unlikely(!skb))
		return ;

		ret = p54_assign_address(priv, skb);
		if (unlikely(ret))
		skb_queue_head(&priv->tx_pending, skb);
		else
		priv->tx(priv->hw, skb);
		}

		static void p54_wake_queues(struct p54_common *priv)
		{
		unsigned long flags;
		unsigned int i;

		if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
		return ;

		p54_tx_pending(priv);

		spin_lock_irqsave(&priv->tx_stats_lock, flags);
		for (i = 0; i < priv->hw->queues; i++) {
		if (priv->tx_stats[i + P54_QUEUE_DATA].len <
		priv->tx_stats[i + P54_QUEUE_DATA].limit)
		ieee80211_wake_queue(priv->hw, i);
		}
		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
		}

		static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
		struct sk_buff *skb,
		const u16 p54_queue)
		{
		struct ieee80211_tx_queue_stats *queue;
		unsigned long flags;

		if (WARN_ON(p54_queue > P54_QUEUE_NUM))
		return -EINVAL;

		queue = &priv->tx_stats[p54_queue];

		spin_lock_irqsave(&priv->tx_stats_lock, flags);
		if (unlikely(queue->len > queue->limit && IS_QOS_QUEUE(p54_queue))) {
		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
		return -ENOSPC;
		}

		queue->len++;
		queue->count++;

		if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
		u16 ac_queue = p54_queue - P54_QUEUE_DATA;
		ieee80211_stop_queue(priv->hw, ac_queue);
		}

		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
		return 0;
		}

		static void p54_tx_qos_accounting_free(struct p54_common *priv,
		struct sk_buff *skb)
		{
		if (skb && IS_DATA_FRAME(skb)) {
		struct p54_hdr hdr = (void ) skb->data;
		struct p54_tx_data data = (void ) hdr->data;

		priv->tx_stats[data->hw_queue].len--;
		}
		p54_wake_queues(priv);
		}

		void p54_free_skb(struct ieee80211_hw dev, struct sk_buff skb)
		{
		struct p54_common *priv = dev->priv;
		if (unlikely(!skb))
		return ;

		skb_unlink(skb, &priv->tx_queue);
		p54_tx_qos_accounting_free(priv, skb);
		dev_kfree_skb_any(skb);
		}
		EXPORT_SYMBOL_GPL(p54_free_skb);

		static struct sk_buff p54_find_and_unlink_skb(struct p54_common priv,
		const __le32 req_id)
		{
		struct sk_buff *entry;
		unsigned long flags;

		spin_lock_irqsave(&priv->tx_queue.lock, flags);
		skb_queue_walk(&priv->tx_queue, entry) {
		struct p54_hdr hdr = (struct p54_hdr ) entry->data;

		if (hdr->req_id == req_id) {
		__skb_unlink(entry, &priv->tx_queue);
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		p54_tx_qos_accounting_free(priv, entry);
		return entry;
		}
		}
		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
		return NULL;
		}

		void p54_tx(struct p54_common priv, struct sk_buff skb)
		{
		if (unlikely(WARN_ON(!priv)))
		return ;

		skb_queue_tail(&priv->tx_pending, skb);
		p54_tx_pending(priv);
		}

		static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
		{
		int band = priv->hw->conf.channel->band;

		if (priv->rxhw != 5)
		return ((rssi * priv->rssical_db[band].mul) / 64 +
		priv->rssical_db[band].add) / 4;
		else
		/*
		* TODO: find the correct formula
		*/
		return ((rssi * priv->rssical_db[band].mul) / 64 +
		priv->rssical_db[band].add) / 4;
		}

		static int p54_rx_data(struct p54_common priv, struct sk_buff skb)
		{
		struct p54_rx_data hdr = (struct p54_rx_data ) skb->data;
		struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
		u16 freq = le16_to_cpu(hdr->freq);
		size_t header_len = sizeof(*hdr);
		u32 tsf32;
		u8 rate = hdr->rate & 0xf;

		/*
		* If the device is in a unspecified state we have to
		* ignore all data frames. Else we could end up with a
		* nasty crash.
		*/
		if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
		return 0;

		if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
		return 0;

		if (hdr->decrypt_status == P54_DECRYPT_OK)
		rx_status->flag \|= RX_FLAG_DECRYPTED;
		if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) \|\|
		(hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
		rx_status->flag \|= RX_FLAG_MMIC_ERROR;

		rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
		rx_status->noise = priv->noise;
		if (hdr->rate & 0x10)
		rx_status->flag \|= RX_FLAG_SHORTPRE;
		if (priv->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
		rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
		else
		rx_status->rate_idx = rate;

		rx_status->freq = freq;
		rx_status->band = priv->hw->conf.channel->band;
		rx_status->antenna = hdr->antenna;

		tsf32 = le32_to_cpu(hdr->tsf32);
		if (tsf32 < priv->tsf_low32)
		priv->tsf_high32++;
		rx_status->mactime = ((u64)priv->tsf_high32) << 32 \| tsf32;
		priv->tsf_low32 = tsf32;

		rx_status->flag \|= RX_FLAG_TSFT;

		if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
		header_len += hdr->align[0];

		skb_pull(skb, header_len);
		skb_trim(skb, le16_to_cpu(hdr->len));
		ieee80211_rx_irqsafe(priv->hw, skb);

		queue_delayed_work(priv->hw->workqueue, &priv->work,
		msecs_to_jiffies(P54_STATISTICS_UPDATE));

		return -1;
		}

		static void p54_rx_frame_sent(struct p54_common priv, struct sk_buff skb)
		{
		struct p54_hdr hdr = (struct p54_hdr ) skb->data;
		struct p54_frame_sent payload = (struct p54_frame_sent ) hdr->data;
		struct ieee80211_tx_info *info;
		struct p54_hdr *entry_hdr;
		struct p54_tx_data *entry_data;
		struct sk_buff *entry;
		unsigned int pad = 0, frame_len;
		int count, idx;

		entry = p54_find_and_unlink_skb(priv, hdr->req_id);
		if (unlikely(!entry))
		return ;

		frame_len = entry->len;
		info = IEEE80211_SKB_CB(entry);
		entry_hdr = (struct p54_hdr *) entry->data;
		entry_data = (struct p54_tx_data *) entry_hdr->data;
		priv->stats.dot11ACKFailureCount += payload->tries - 1;

		/*
		* Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
		* generated by the driver. Therefore tx_status is bogus
		* and we don't want to confuse the mac80211 stack.
		*/
		if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
		if (entry_data->hw_queue == P54_QUEUE_BEACON &&
		hdr->req_id == priv->beacon_req_id)
		priv->beacon_req_id = cpu_to_le32(0);

		dev_kfree_skb_any(entry);
		return ;
		}

		/*
		* Clear manually, ieee80211_tx_info_clear_status would
		* clear the counts too and we need them.
		*/
		memset(&info->status.ampdu_ack_len, 0,
		sizeof(struct ieee80211_tx_info) -
		offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
		BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
		status.ampdu_ack_len) != 23);

		if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
		pad = entry_data->align[0];

		/* walk through the rates array and adjust the counts */
		count = payload->tries;
		for (idx = 0; idx < 4; idx++) {
		if (count >= info->status.rates[idx].count) {
		count -= info->status.rates[idx].count;
		} else if (count > 0) {
		info->status.rates[idx].count = count;
		count = 0;
		} else {
		info->status.rates[idx].idx = -1;
		info->status.rates[idx].count = 0;
		}
		}

		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
		(!payload->status))
		info->flags \|= IEEE80211_TX_STAT_ACK;
		if (payload->status & P54_TX_PSM_CANCELLED)
		info->flags \|= IEEE80211_TX_STAT_TX_FILTERED;
		info->status.ack_signal = p54_rssi_to_dbm(priv,
		(int)payload->ack_rssi);

		/* Undo all changes to the frame. */
		switch (entry_data->key_type) {
		case P54_CRYPTO_TKIPMICHAEL: {
		u8 iv = (u8 )(entry_data->align + pad +
		entry_data->crypt_offset);

		/* Restore the original TKIP IV. */
		iv[2] = iv[0];
		iv[0] = iv[1];
		iv[1] = (iv[0] \| 0x20) & 0x7f; /* WEPSeed - 8.3.2.2 */

		frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
		break;
		}
		case P54_CRYPTO_AESCCMP:
		frame_len -= 8; /* remove CCMP_MIC */
		break;
		case P54_CRYPTO_WEP:
		frame_len -= 4; /* remove WEP_ICV */
		break;
		}

		skb_trim(entry, frame_len);
		skb_pull(entry, sizeof(hdr) + pad + sizeof(entry_data));
		ieee80211_tx_status_irqsafe(priv->hw, entry);
		}

		static void p54_rx_eeprom_readback(struct p54_common *priv,
		struct sk_buff *skb)
		{
		struct p54_hdr hdr = (struct p54_hdr ) skb->data;
		struct p54_eeprom_lm86 eeprom = (struct p54_eeprom_lm86 ) hdr->data;
		struct sk_buff *tmp;

		if (!priv->eeprom)
		return ;

		if (priv->fw_var >= 0x509) {
		memcpy(priv->eeprom, eeprom->v2.data,
		le16_to_cpu(eeprom->v2.len));
		} else {
		memcpy(priv->eeprom, eeprom->v1.data,
		le16_to_cpu(eeprom->v1.len));
		}

		priv->eeprom = NULL;
		tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
		p54_tx_qos_accounting_free(priv, tmp);
		dev_kfree_skb_any(tmp);
		complete(&priv->eeprom_comp);
		}

		static void p54_rx_stats(struct p54_common priv, struct sk_buff skb)
		{
		struct p54_hdr hdr = (struct p54_hdr ) skb->data;
		struct p54_statistics stats = (struct p54_statistics ) hdr->data;
		struct sk_buff *tmp;
		u32 tsf32;

		if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
		return ;

		tsf32 = le32_to_cpu(stats->tsf32);
		if (tsf32 < priv->tsf_low32)
		priv->tsf_high32++;
		priv->tsf_low32 = tsf32;

		priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
		priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
		priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);

		priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));

		tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
		p54_tx_qos_accounting_free(priv, tmp);
		dev_kfree_skb_any(tmp);
		}

		static void p54_rx_trap(struct p54_common priv, struct sk_buff skb)
		{
		struct p54_hdr hdr = (struct p54_hdr ) skb->data;
		struct p54_trap trap = (struct p54_trap ) hdr->data;
		u16 event = le16_to_cpu(trap->event);
		u16 freq = le16_to_cpu(trap->frequency);

		switch (event) {
		case P54_TRAP_BEACON_TX:
		break;
		case P54_TRAP_RADAR:
		printk(KERN_INFO "%s: radar (freq:%d MHz)\n",
		wiphy_name(priv->hw->wiphy), freq);
		break;
		case P54_TRAP_NO_BEACON:
		if (priv->vif)
		ieee80211_beacon_loss(priv->vif);
		break;
		case P54_TRAP_SCAN:
		break;
		case P54_TRAP_TBTT:
		break;
		case P54_TRAP_TIMER:
		break;
		default:
		printk(KERN_INFO "%s: received event:%x freq:%d\n",
		wiphy_name(priv->hw->wiphy), event, freq);
		break;
		}
		}

		static int p54_rx_control(struct p54_common priv, struct sk_buff skb)
		{
		struct p54_hdr hdr = (struct p54_hdr ) skb->data;

		switch (le16_to_cpu(hdr->type)) {
		case P54_CONTROL_TYPE_TXDONE:
		p54_rx_frame_sent(priv, skb);
		break;
		case P54_CONTROL_TYPE_TRAP:
		p54_rx_trap(priv, skb);
		break;
		case P54_CONTROL_TYPE_BBP:
		break;
		case P54_CONTROL_TYPE_STAT_READBACK:
		p54_rx_stats(priv, skb);
		break;
		case P54_CONTROL_TYPE_EEPROM_READBACK:
		p54_rx_eeprom_readback(priv, skb);
		break;
		default:
		printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
		wiphy_name(priv->hw->wiphy), le16_to_cpu(hdr->type));
		break;
		}
		return 0;
		}

		/* returns zero if skb can be reused */
		int p54_rx(struct ieee80211_hw dev, struct sk_buff skb)
		{
		struct p54_common *priv = dev->priv;
		u16 type = le16_to_cpu(((__le16 )skb->data));

		if (type & P54_HDR_FLAG_CONTROL)
		return p54_rx_control(priv, skb);
		else
		return p54_rx_data(priv, skb);
		}
		EXPORT_SYMBOL_GPL(p54_rx);

		static void p54_tx_80211_header(struct p54_common priv, struct sk_buff skb,
		struct ieee80211_tx_info info, u8 queue,
		u32 extra_len, u16 flags, u16 *aid,
		bool *burst_possible)
		{
		struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;

		if (ieee80211_is_data_qos(hdr->frame_control))
		*burst_possible = true;
		else
		*burst_possible = false;

		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
		*flags \|= P54_HDR_FLAG_DATA_OUT_SEQNR;

		if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
		*flags \|= P54_HDR_FLAG_DATA_OUT_NOCANCEL;

		*queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;

		switch (priv->mode) {
		case NL80211_IFTYPE_MONITOR:
		/*
		* We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
		* every frame in promiscuous/monitor mode.
		* see STSW45x0C LMAC API - page 12.
		*/
		*aid = 0;
		*flags \|= P54_HDR_FLAG_DATA_OUT_PROMISC;
		break;
		case NL80211_IFTYPE_STATION:
		*aid = 1;
		break;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_MESH_POINT:
		if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
		*aid = 0;
		*queue = P54_QUEUE_CAB;
		return;
		}

		if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
		if (ieee80211_is_probe_resp(hdr->frame_control)) {
		*aid = 0;
		*flags \|= P54_HDR_FLAG_DATA_OUT_TIMESTAMP \|
		P54_HDR_FLAG_DATA_OUT_NOCANCEL;
		return;
		} else if (ieee80211_is_beacon(hdr->frame_control)) {
		*aid = 0;

		if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		/*
		* Injecting beacons on top of a AP is
		* not a good idea... nevertheless,
		* it should be doable.
		*/

		return;
		}

		*flags \|= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
		*queue = P54_QUEUE_BEACON;
		*extra_len = IEEE80211_MAX_TIM_LEN;
		return;
		}
		}

		if (info->control.sta)
		*aid = info->control.sta->aid;
		break;
		}
		}

		static u8 p54_convert_algo(enum ieee80211_key_alg alg)
		{
		switch (alg) {
		case ALG_WEP:
		return P54_CRYPTO_WEP;
		case ALG_TKIP:
		return P54_CRYPTO_TKIPMICHAEL;
		case ALG_CCMP:
		return P54_CRYPTO_AESCCMP;
		default:
		return 0;
		}
		}

		int p54_tx_80211(struct ieee80211_hw dev, struct sk_buff skb)
		{
		struct p54_common *priv = dev->priv;
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		struct p54_tx_info *p54info;
		struct p54_hdr *hdr;
		struct p54_tx_data *txhdr;
		unsigned int padding, len, extra_len;
		int i, j, ridx;
		u16 hdr_flags = 0, aid = 0;
		u8 rate, queue = 0, crypt_offset = 0;
		u8 cts_rate = 0x20;
		u8 rc_flags;
		u8 calculated_tries[4];
		u8 nrates = 0, nremaining = 8;
		bool burst_allowed = false;

		p54_tx_80211_header(priv, skb, info, &queue, &extra_len,
		&hdr_flags, &aid, &burst_allowed);

		if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
		if (!IS_QOS_QUEUE(queue)) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
		} else {
		return NETDEV_TX_BUSY;
		}
		}

		padding = (unsigned long)(skb->data - (sizeof(hdr) + sizeof(txhdr))) & 3;
		len = skb->len;

		if (info->control.hw_key) {
		crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
		if (info->control.hw_key->alg == ALG_TKIP) {
		u8 iv = (u8 )(skb->data + crypt_offset);
		/*
		* The firmware excepts that the IV has to have
		* this special format
		*/
		iv[1] = iv[0];
		iv[0] = iv[2];
		iv[2] = 0;
		}
		}

		txhdr = (struct p54_tx_data ) skb_push(skb, sizeof(txhdr) + padding);
		hdr = (struct p54_hdr ) skb_push(skb, sizeof(hdr));

		if (padding)
		hdr_flags \|= P54_HDR_FLAG_DATA_ALIGN;
		hdr->type = cpu_to_le16(aid);
		hdr->rts_tries = info->control.rates[0].count;

		/*
		* we register the rates in perfect order, and
		* RTS/CTS won't happen on 5 GHz
		*/
		cts_rate = info->control.rts_cts_rate_idx;

		memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));

		/* see how many rates got used */
		for (i = 0; i < dev->max_rates; i++) {
		if (info->control.rates[i].idx < 0)
		break;
		nrates++;
		}

		/* limit tries to 8/nrates per rate */
		for (i = 0; i < nrates; i++) {
		/*
		* The magic expression here is equivalent to 8/nrates for
		* all values that matter, but avoids division and jumps.
		* Note that nrates can only take the values 1 through 4.
		*/
		calculated_tries[i] = min_t(int, ((15 >> nrates) \| 1) + 1,
		info->control.rates[i].count);
		nremaining -= calculated_tries[i];
		}

		/* if there are tries left, distribute from back to front */
		for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
		int tmp = info->control.rates[i].count - calculated_tries[i];

		if (tmp <= 0)
		continue;
		/* RC requested more tries at this rate */

		tmp = min_t(int, tmp, nremaining);
		calculated_tries[i] += tmp;
		nremaining -= tmp;
		}

		ridx = 0;
		for (i = 0; i < nrates && ridx < 8; i++) {
		/* we register the rates in perfect order */
		rate = info->control.rates[i].idx;
		if (info->band == IEEE80211_BAND_5GHZ)
		rate += 4;

		/* store the count we actually calculated for TX status */
		info->control.rates[i].count = calculated_tries[i];

		rc_flags = info->control.rates[i].flags;
		if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
		rate \|= 0x10;
		cts_rate \|= 0x10;
		}
		if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
		burst_allowed = false;
		rate \|= 0x40;
		} else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
		rate \|= 0x20;
		burst_allowed = false;
		}
		for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
		txhdr->rateset[ridx] = rate;
		ridx++;
		}
		}

		if (burst_allowed)
		hdr_flags \|= P54_HDR_FLAG_DATA_OUT_BURST;

		/* TODO: enable bursting */
		hdr->flags = cpu_to_le16(hdr_flags);
		hdr->tries = ridx;
		txhdr->rts_rate_idx = 0;
		if (info->control.hw_key) {
		txhdr->key_type = p54_convert_algo(info->control.hw_key->alg);
		txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
		memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
		if (info->control.hw_key->alg == ALG_TKIP) {
		/* reserve space for the MIC key */
		len += 8;
		memcpy(skb_put(skb, 8), &(info->control.hw_key->key
		[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
		}
		/* reserve some space for ICV */
		len += info->control.hw_key->icv_len;
		memset(skb_put(skb, info->control.hw_key->icv_len), 0,
		info->control.hw_key->icv_len);
		} else {
		txhdr->key_type = 0;
		txhdr->key_len = 0;
		}
		txhdr->crypt_offset = crypt_offset;
		txhdr->hw_queue = queue;
		txhdr->backlog = priv->tx_stats[queue].len - 1;
		memset(txhdr->durations, 0, sizeof(txhdr->durations));
		txhdr->tx_antenna = ((info->antenna_sel_tx == 0) ?
		2 : info->antenna_sel_tx - 1) & priv->tx_diversity_mask;
		if (priv->rxhw == 5) {
		txhdr->longbow.cts_rate = cts_rate;
		txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
		} else {
		txhdr->normal.output_power = priv->output_power;
		txhdr->normal.cts_rate = cts_rate;
		}
		if (padding)
		txhdr->align[0] = padding;

		hdr->len = cpu_to_le16(len);
		/* modifies skb->cb and with it info, so must be last! */
		p54info = (void *) info->rate_driver_data;
		p54info->extra_len = extra_len;

		p54_tx(priv, skb);
		return NETDEV_TX_OK;
		}