p54: Move TX/RX code

Copy the TX/RX code from p54common.c into a new file txrx.c Signed-off-by: Christian Lamparter <chunkeey@web.de> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2024-12-21 08:53:41 +00:00 · 2009-06-23 10:39:12 -05:00 · 2009-06-23 10:39:12 -05:00 · 0a5fb84f6b
commit 0a5fb84f6b
parent 0ac0d6cedf
1 changed files with 825 additions and 0 deletions
--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@ -0,0 +1,825 @@
+/*
+ * 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;
+}