[PATCH 09/15] cw1200: v3: packet transmit and receiving

[Solomon Peachy <pizza@shaftnet.org>]

Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
---
 drivers/staging/cw1200/txrx.c | 1400 +++++++++++++++++++++++++++++++++++++++++
 drivers/staging/cw1200/txrx.h |   94 +++
 2 files changed, 1494 insertions(+)
 create mode 100644 drivers/staging/cw1200/txrx.c
 create mode 100644 drivers/staging/cw1200/txrx.h

diff --git a/drivers/staging/cw1200/txrx.c b/drivers/staging/cw1200/txrx.c
new file mode 100644
index 0000000..7ee0b83
--- /dev/null
+++ b/drivers/staging/cw1200/txrx.c
@@ -0,0 +1,1400 @@
+/*
+ * Datapath implementation for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@stericsson.com>
+ *
+ * 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 <net/mac80211.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include "cw1200.h"
+#include "wsm.h"
+#include "bh.h"
+#include "ap.h"
+#include "debug.h"
+
+#define CW1200_INVALID_RATE_ID (0xFF)
+
+static int cw1200_handle_action_rx(struct cw1200_common *priv,
+				   struct sk_buff *skb);
+static const struct ieee80211_rate *
+cw1200_get_tx_rate(const struct cw1200_common *priv,
+		   const struct ieee80211_tx_rate *rate);
+
+/* ******************************************************************** */
+/* TX queue lock / unlock						*/
+
+static inline void cw1200_tx_queues_lock(struct cw1200_common *priv)
+{
+	int i;
+	for (i = 0; i < 4; ++i)
+		cw1200_queue_lock(&priv->tx_queue[i]);
+}
+
+static inline void cw1200_tx_queues_unlock(struct cw1200_common *priv)
+{
+	int i;
+	for (i = 0; i < 4; ++i)
+		cw1200_queue_unlock(&priv->tx_queue[i]);
+}
+
+/* ******************************************************************** */
+/* TX policy cache implementation					*/
+
+static void tx_policy_dump(struct tx_policy *policy)
+{
+	pr_debug("[TX policy] %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X %.1X%.1X%.1X%.1X%.1X%.1X%.1X%.1X: %d\n",
+		policy->raw[0] & 0x0F,  policy->raw[0] >> 4,
+		policy->raw[1] & 0x0F,  policy->raw[1] >> 4,
+		policy->raw[2] & 0x0F,  policy->raw[2] >> 4,
+		policy->raw[3] & 0x0F,  policy->raw[3] >> 4,
+		policy->raw[4] & 0x0F,  policy->raw[4] >> 4,
+		policy->raw[5] & 0x0F,  policy->raw[5] >> 4,
+		policy->raw[6] & 0x0F,  policy->raw[6] >> 4,
+		policy->raw[7] & 0x0F,  policy->raw[7] >> 4,
+		policy->raw[8] & 0x0F,  policy->raw[8] >> 4,
+		policy->raw[9] & 0x0F,  policy->raw[9] >> 4,
+		policy->raw[10] & 0x0F,  policy->raw[10] >> 4,
+		policy->raw[11] & 0x0F,  policy->raw[11] >> 4,
+		policy->defined);
+}
+
+static void tx_policy_build(const struct cw1200_common *priv,
+	/* [out] */ struct tx_policy *policy,
+	struct ieee80211_tx_rate *rates, size_t count)
+{
+	int i, j;
+	unsigned limit = priv->short_frame_max_tx_count;
+	unsigned total = 0;
+	BUG_ON(rates[0].idx < 0);
+	memset(policy, 0, sizeof(*policy));
+
+	/* minstrel is buggy a little bit, so distille
+	 * incoming rates first. */
+
+	/* Sort rates in descending order. */
+	for (i = 1; i < count; ++i) {
+		if (rates[i].idx < 0) {
+			count = i;
+			break;
+		}
+		if (rates[i].idx > rates[i - 1].idx) {
+			struct ieee80211_tx_rate tmp = rates[i - 1];
+			rates[i - 1] = rates[i];
+			rates[i] = tmp;
+		}
+	}
+
+	/* Eliminate duplicates. */
+	total = rates[0].count;
+	for (i = 0, j = 1; j < count; ++j) {
+		if (rates[j].idx == rates[i].idx) {
+			rates[i].count += rates[j].count;
+		} else if (rates[j].idx > rates[i].idx) {
+			break;
+		} else {
+			++i;
+			if (i != j)
+				rates[i] = rates[j];
+		}
+		total += rates[j].count;
+	}
+	count = i + 1;
+
+	/* Re-fill policy trying to keep every requested rate and with
+	 * respect to the global max tx retransmission count. */
+	if (limit < count)
+		limit = count;
+	if (total > limit) {
+		for (i = 0; i < count; ++i) {
+			int left = count - i - 1;
+			if (rates[i].count > limit - left)
+				rates[i].count = limit - left;
+			limit -= rates[i].count;
+		}
+	}
+
+	/* HACK!!! Device has problems (at least) switching from
+	 * 54Mbps CTS to 1Mbps. This switch takes enormous amount
+	 * of time (100-200 ms), leading to valuable throughput drop.
+	 * As a workaround, additional g-rates are injected to the
+	 * policy.
+	 */
+	if (count == 2 && !(rates[0].flags & IEEE80211_TX_RC_MCS) &&
+			rates[0].idx > 4 && rates[0].count > 2 &&
+			rates[1].idx < 2) {
+		/* ">> 1" is an equivalent of "/ 2", but faster */
+		int mid_rate = (rates[0].idx + 4) >> 1;
+
+		/* Decrease number of retries for the initial rate */
+		rates[0].count -= 2;
+
+		if (mid_rate != 4) {
+			/* Keep fallback rate at 1Mbps. */
+			rates[3] = rates[1];
+
+			/* Inject 1 transmission on lowest g-rate */
+			rates[2].idx = 4;
+			rates[2].count = 1;
+			rates[2].flags = rates[1].flags;
+
+			/* Inject 1 transmission on mid-rate */
+			rates[1].idx = mid_rate;
+			rates[1].count = 1;
+
+			/* Fallback to 1 Mbps is a really bad thing,
+			 * so let's try to increase probability of
+			 * successful transmission on the lowest g rate
+			 * even more */
+			if (rates[0].count >= 3) {
+				--rates[0].count;
+				++rates[2].count;
+			}
+
+			/* Adjust amount of rates defined */
+			count += 2;
+		} else {
+			/* Keep fallback rate at 1Mbps. */
+			rates[2] = rates[1];
+
+			/* Inject 2 transmissions on lowest g-rate */
+			rates[1].idx = 4;
+			rates[1].count = 2;
+
+			/* Adjust amount of rates defined */
+			count += 1;
+		}
+	}
+
+	policy->defined = cw1200_get_tx_rate(priv, &rates[0])->hw_value + 1;
+
+	for (i = 0; i < count; ++i) {
+		register unsigned rateid, off, shift, retries;
+
+		rateid = cw1200_get_tx_rate(priv, &rates[i])->hw_value;
+		off = rateid >> 3;		/* eq. rateid / 8 */
+		shift = (rateid & 0x07) << 2;	/* eq. (rateid % 8) * 4 */
+
+		retries = rates[i].count;
+		if (unlikely(retries > 0x0F))
+			rates[i].count = retries = 0x0F;
+		policy->tbl[off] |= __cpu_to_le32(retries << shift);
+		policy->retry_count += retries;
+	}
+
+	pr_debug("[TX policy] Policy (%d): %d:%d, %d:%d, %d:%d, %d:%d, %d:%d\n",
+		count,
+		rates[0].idx, rates[0].count,
+		rates[1].idx, rates[1].count,
+		rates[2].idx, rates[2].count,
+		rates[3].idx, rates[3].count,
+		rates[4].idx, rates[4].count);
+}
+
+static inline bool tx_policy_is_equal(const struct tx_policy *wanted,
+					const struct tx_policy *cached)
+{
+	size_t count = wanted->defined >> 1;
+	if (wanted->defined > cached->defined)
+		return false;
+	if (count) {
+		if (memcmp(wanted->raw, cached->raw, count))
+			return false;
+	}
+	if (wanted->defined & 1) {
+		if ((wanted->raw[count] & 0x0F) != (cached->raw[count] & 0x0F))
+			return false;
+	}
+	return true;
+}
+
+static int tx_policy_find(struct tx_policy_cache *cache,
+				const struct tx_policy *wanted)
+{
+	/* O(n) complexity. Not so good, but there's only 8 entries in
+	 * the cache.
+	 * Also lru helps to reduce search time. */
+	struct tx_policy_cache_entry *it;
+	/* First search for policy in "used" list */
+	list_for_each_entry(it, &cache->used, link) {
+		if (tx_policy_is_equal(wanted, &it->policy))
+			return it - cache->cache;
+	}
+	/* Then - in "free list" */
+	list_for_each_entry(it, &cache->free, link) {
+		if (tx_policy_is_equal(wanted, &it->policy))
+			return it - cache->cache;
+	}
+	return -1;
+}
+
+static inline void tx_policy_use(struct tx_policy_cache *cache,
+				 struct tx_policy_cache_entry *entry)
+{
+	++entry->policy.usage_count;
+	list_move(&entry->link, &cache->used);
+}
+
+static inline int tx_policy_release(struct tx_policy_cache *cache,
+				    struct tx_policy_cache_entry *entry)
+{
+	int ret = --entry->policy.usage_count;
+	if (!ret)
+		list_move(&entry->link, &cache->free);
+	return ret;
+}
+
+void tx_policy_clean(struct cw1200_common *priv)
+{
+	int idx, locked;
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+	struct tx_policy_cache_entry *entry;
+
+	cw1200_tx_queues_lock(priv);
+	spin_lock_bh(&cache->lock);
+	locked = list_empty(&cache->free);
+
+	for (idx = 0; idx < TX_POLICY_CACHE_SIZE; idx++) {
+		entry = &cache->cache[idx];
+		/* Policy usage count should be 0 at this time as all queues
+		   should be empty */
+		if (entry->policy.usage_count) {
+			WARN_ON(1);
+			entry->policy.usage_count = 0;
+			list_move(&entry->link, &cache->free);
+		}
+		memset(&entry->policy, 0, sizeof(entry->policy));
+	}
+	if (locked)
+		cw1200_tx_queues_unlock(priv);
+
+	cw1200_tx_queues_unlock(priv);
+	spin_unlock_bh(&cache->lock);
+}
+
+/* ******************************************************************** */
+/* External TX policy cache API						*/
+
+void tx_policy_init(struct cw1200_common *priv)
+{
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+	int i;
+
+	memset(cache, 0, sizeof(*cache));
+
+	spin_lock_init(&cache->lock);
+	INIT_LIST_HEAD(&cache->used);
+	INIT_LIST_HEAD(&cache->free);
+
+	for (i = 0; i < TX_POLICY_CACHE_SIZE; ++i)
+		list_add(&cache->cache[i].link, &cache->free);
+}
+
+static int tx_policy_get(struct cw1200_common *priv,
+		  struct ieee80211_tx_rate *rates,
+		  size_t count, bool *renew)
+{
+	int idx;
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+	struct tx_policy wanted;
+
+	tx_policy_build(priv, &wanted, rates, count);
+
+	spin_lock_bh(&cache->lock);
+	if (WARN_ON_ONCE(list_empty(&cache->free))) {
+		spin_unlock_bh(&cache->lock);
+		return CW1200_INVALID_RATE_ID;
+	}
+	idx = tx_policy_find(cache, &wanted);
+	if (idx >= 0) {
+		pr_debug("[TX policy] Used TX policy: %d\n",
+					idx);
+		*renew = false;
+	} else {
+		struct tx_policy_cache_entry *entry;
+		*renew = true;
+		/* If policy is not found create a new one
+		 * using the oldest entry in "free" list */
+		entry = list_entry(cache->free.prev,
+			struct tx_policy_cache_entry, link);
+		entry->policy = wanted;
+		idx = entry - cache->cache;
+		pr_debug("[TX policy] New TX policy: %d\n", idx);
+		tx_policy_dump(&entry->policy);
+	}
+	tx_policy_use(cache, &cache->cache[idx]);
+	if (unlikely(list_empty(&cache->free))) {
+		/* Lock TX queues. */
+		cw1200_tx_queues_lock(priv);
+	}
+	spin_unlock_bh(&cache->lock);
+	return idx;
+}
+
+static void tx_policy_put(struct cw1200_common *priv, int idx)
+{
+	int usage, locked;
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+
+	spin_lock_bh(&cache->lock);
+	locked = list_empty(&cache->free);
+	usage = tx_policy_release(cache, &cache->cache[idx]);
+	if (unlikely(locked) && !usage) {
+		/* Unlock TX queues. */
+		cw1200_tx_queues_unlock(priv);
+	}
+	spin_unlock_bh(&cache->lock);
+}
+
+/*
+bool tx_policy_cache_full(struct cw1200_common *priv)
+{
+	bool ret;
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+	spin_lock_bh(&cache->lock);
+	ret = list_empty(&cache->free);
+	spin_unlock_bh(&cache->lock);
+	return ret;
+}
+*/
+
+static int tx_policy_upload(struct cw1200_common *priv)
+{
+	struct tx_policy_cache *cache = &priv->tx_policy_cache;
+	int i;
+	struct wsm_set_tx_rate_retry_policy arg = {
+		.hdr = {
+			.numTxRatePolicies = 0,
+		}
+	};
+	spin_lock_bh(&cache->lock);
+
+	/* Upload only modified entries. */
+	for (i = 0; i < TX_POLICY_CACHE_SIZE; ++i) {
+		struct tx_policy *src = &cache->cache[i].policy;
+		if (src->retry_count && !src->uploaded) {
+			struct wsm_set_tx_rate_retry_policy_policy *dst =
+				&arg.tbl[arg.hdr.numTxRatePolicies];
+			dst->policyIndex = i;
+			dst->shortRetryCount = priv->short_frame_max_tx_count;
+			dst->longRetryCount = priv->long_frame_max_tx_count;
+
+			/* BIT(2) - Terminate retries when Tx rate retry policy
+			 *          finishes.
+			 * BIT(3) - Count initial frame transmission as part of
+			 *          rate retry counting but not as a retry
+			 *          attempt */
+			dst->policyFlags = BIT(2) | BIT(3);
+
+			memcpy(dst->rateCountIndices, src->tbl,
+					sizeof(dst->rateCountIndices));
+			src->uploaded = 1;
+			++arg.hdr.numTxRatePolicies;
+		}
+	}
+	spin_unlock_bh(&cache->lock);
+	cw1200_debug_tx_cache_miss(priv);
+	pr_debug("[TX policy] Upload %d policies\n",
+				arg.hdr.numTxRatePolicies);
+	return wsm_set_tx_rate_retry_policy(priv, &arg);
+}
+
+void tx_policy_upload_work(struct work_struct *work)
+{
+	struct cw1200_common *priv =
+		container_of(work, struct cw1200_common, tx_policy_upload_work);
+
+	pr_debug("[TX] TX policy upload.\n");
+	WARN_ON(tx_policy_upload(priv));
+
+	wsm_unlock_tx(priv);
+	cw1200_tx_queues_unlock(priv);
+}
+
+/* ******************************************************************** */
+/* cw1200 TX implementation						*/
+
+struct cw1200_txinfo {
+	struct sk_buff *skb;
+	unsigned queue;
+	struct ieee80211_tx_info *tx_info;
+	const struct ieee80211_rate *rate;
+	struct ieee80211_hdr *hdr;
+	size_t hdrlen;
+	const u8 *da;
+	struct cw1200_sta_priv *sta_priv;
+	struct cw1200_txpriv txpriv;
+};
+
+u32 cw1200_rate_mask_to_wsm(struct cw1200_common *priv, u32 rates)
+{
+	u32 ret = 0;
+	int i;
+	for (i = 0; i < 32; ++i) {
+		if (rates & BIT(i))
+			ret |= BIT(priv->rates[i].hw_value);
+	}
+	return ret;
+}
+
+static const struct ieee80211_rate *
+cw1200_get_tx_rate(const struct cw1200_common *priv,
+		   const struct ieee80211_tx_rate *rate)
+{
+	if (rate->idx < 0)
+		return NULL;
+	if (rate->flags & IEEE80211_TX_RC_MCS)
+		return &priv->mcs_rates[rate->idx];
+	return &priv->hw->wiphy->bands[priv->channel->band]->
+		bitrates[rate->idx];
+}
+
+static int
+cw1200_tx_h_calc_link_ids(struct cw1200_common *priv,
+			  struct cw1200_txinfo *t)
+{
+
+	if (likely(t->tx_info->control.sta && t->sta_priv->link_id))
+		t->txpriv.raw_link_id =
+				t->txpriv.link_id =
+				t->sta_priv->link_id;
+	else if (priv->mode != NL80211_IFTYPE_AP)
+		t->txpriv.raw_link_id =
+				t->txpriv.link_id = 0;
+	else if (is_multicast_ether_addr(t->da)) {
+		if (priv->enable_beacon) {
+			t->txpriv.raw_link_id = 0;
+			t->txpriv.link_id = CW1200_LINK_ID_AFTER_DTIM;
+		} else {
+			t->txpriv.raw_link_id = 0;
+			t->txpriv.link_id = 0;
+		}
+	} else {
+		t->txpriv.link_id = cw1200_find_link_id(priv, t->da);
+		if (!t->txpriv.link_id)
+			t->txpriv.link_id = cw1200_alloc_link_id(priv, t->da);
+		if (!t->txpriv.link_id) {
+			wiphy_err(priv->hw->wiphy,
+				"%s: No more link IDs available.\n",
+				__func__);
+			return -ENOENT;
+		}
+		t->txpriv.raw_link_id = t->txpriv.link_id;
+	}
+	if (t->txpriv.raw_link_id)
+		priv->link_id_db[t->txpriv.raw_link_id - 1].timestamp =
+				jiffies;
+	if (t->tx_info->control.sta &&
+			(t->tx_info->control.sta->uapsd_queues & BIT(t->queue)))
+		t->txpriv.link_id = CW1200_LINK_ID_UAPSD;
+	return 0;
+}
+
+static void
+cw1200_tx_h_pm(struct cw1200_common *priv,
+	       struct cw1200_txinfo *t)
+{
+	if (unlikely(ieee80211_is_auth(t->hdr->frame_control))) {
+		u32 mask = ~BIT(t->txpriv.raw_link_id);
+		spin_lock_bh(&priv->ps_state_lock);
+		priv->sta_asleep_mask &= mask;
+		priv->pspoll_mask &= mask;
+		spin_unlock_bh(&priv->ps_state_lock);
+	}
+}
+
+static void
+cw1200_tx_h_calc_tid(struct cw1200_common *priv,
+		     struct cw1200_txinfo *t)
+{
+	if (ieee80211_is_data_qos(t->hdr->frame_control)) {
+		u8 *qos = ieee80211_get_qos_ctl(t->hdr);
+		t->txpriv.tid = qos[0] & IEEE80211_QOS_CTL_TID_MASK;
+	} else if (ieee80211_is_data(t->hdr->frame_control)) {
+		t->txpriv.tid = 0;
+	}
+}
+
+static int
+cw1200_tx_h_crypt(struct cw1200_common *priv,
+		  struct cw1200_txinfo *t)
+{
+	if (!t->tx_info->control.hw_key ||
+	    !ieee80211_has_protected(t->hdr->frame_control))
+		return 0;
+
+	t->hdrlen += t->tx_info->control.hw_key->iv_len;
+	skb_put(t->skb, t->tx_info->control.hw_key->icv_len);
+
+	if (t->tx_info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
+		skb_put(t->skb, 8); /* MIC space */
+
+	return 0;
+}
+
+static int
+cw1200_tx_h_align(struct cw1200_common *priv,
+		  struct cw1200_txinfo *t,
+		  u8 *flags)
+{
+	size_t offset = (size_t)t->skb->data & 3;
+
+	if (!offset)
+		return 0;
+
+	if (offset & 1) {
+		wiphy_err(priv->hw->wiphy,
+			"Bug: attempt to transmit a frame "
+			"with wrong alignment: %d\n",
+			offset);
+		return -EINVAL;
+	}
+
+	if (skb_headroom(t->skb) < offset) {
+		wiphy_err(priv->hw->wiphy,
+			"Bug: no space allocated "
+			"for DMA alignment.\n"
+			"headroom: %d\n",
+			skb_headroom(t->skb));
+		return -ENOMEM;
+	}
+	skb_push(t->skb, offset);
+	t->hdrlen += offset;
+	t->txpriv.offset += offset;
+	*flags |= WSM_TX_2BYTES_SHIFT;
+	cw1200_debug_tx_align(priv);
+	return 0;
+}
+
+static int
+cw1200_tx_h_action(struct cw1200_common *priv,
+		   struct cw1200_txinfo *t)
+{
+	struct ieee80211_mgmt *mgmt =
+		(struct ieee80211_mgmt *)t->hdr;
+	if (ieee80211_is_action(t->hdr->frame_control) &&
+			mgmt->u.action.category == WLAN_CATEGORY_BACK)
+		return 1;
+	else
+		return 0;
+}
+
+/* Add WSM header */
+static struct wsm_tx *
+cw1200_tx_h_wsm(struct cw1200_common *priv,
+		struct cw1200_txinfo *t)
+{
+	struct wsm_tx *wsm;
+
+	if (skb_headroom(t->skb) < sizeof(struct wsm_tx)) {
+		wiphy_err(priv->hw->wiphy,
+			"Bug: no space allocated "
+			"for WSM header.\n"
+			"headroom: %d\n",
+			skb_headroom(t->skb));
+		return NULL;
+	}
+
+	wsm = (struct wsm_tx *)skb_push(t->skb, sizeof(struct wsm_tx));
+	t->txpriv.offset += sizeof(struct wsm_tx);
+	memset(wsm, 0, sizeof(*wsm));
+	wsm->hdr.len = __cpu_to_le16(t->skb->len);
+	wsm->hdr.id = __cpu_to_le16(0x0004);
+	wsm->queueId = wsm_queue_id_to_wsm(t->queue);
+	return wsm;
+}
+
+/* BT Coex specific handling */
+static void
+cw1200_tx_h_bt(struct cw1200_common *priv,
+	       struct cw1200_txinfo *t,
+	       struct wsm_tx *wsm)
+{
+	u8 priority = 0;
+
+	if (!priv->is_BT_Present)
+		return;
+
+	if (unlikely(ieee80211_is_nullfunc(t->hdr->frame_control)))
+		priority = WSM_EPTA_PRIORITY_MGT;
+	else if (ieee80211_is_data(t->hdr->frame_control)) {
+		/* Skip LLC SNAP header (+6) */
+		u8 *payload = &t->skb->data[t->hdrlen];
+		u16 *ethertype = (u16 *) &payload[6];
+		if (unlikely(*ethertype == __be16_to_cpu(ETH_P_PAE)))
+			priority = WSM_EPTA_PRIORITY_EAPOL;
+	} else if (unlikely(ieee80211_is_assoc_req(t->hdr->frame_control) ||
+		ieee80211_is_reassoc_req(t->hdr->frame_control))) {
+		struct ieee80211_mgmt *mgt_frame =
+				(struct ieee80211_mgmt *)t->hdr;
+
+		if (mgt_frame->u.assoc_req.listen_interval <
+						priv->listen_interval) {
+			pr_debug("Modified Listen Interval to %d from %d\n",
+				priv->listen_interval,
+				mgt_frame->u.assoc_req.listen_interval);
+			/* Replace listen interval derieved from
+			 * the one read from SDD */
+			mgt_frame->u.assoc_req.listen_interval =
+				priv->listen_interval;
+		}
+	}
+
+	if (likely(!priority)) {
+		if (ieee80211_is_action(t->hdr->frame_control))
+			priority = WSM_EPTA_PRIORITY_ACTION;
+		else if (ieee80211_is_mgmt(t->hdr->frame_control))
+			priority = WSM_EPTA_PRIORITY_MGT;
+		else if ((wsm->queueId == WSM_QUEUE_VOICE))
+			priority = WSM_EPTA_PRIORITY_VOICE;
+		else if ((wsm->queueId == WSM_QUEUE_VIDEO))
+			priority = WSM_EPTA_PRIORITY_VIDEO;
+		else
+			priority = WSM_EPTA_PRIORITY_DATA;
+	}
+
+	pr_debug("[TX] EPTA priority %d.\n",
+		priority);
+
+	wsm->flags |= priority << 1;
+}
+
+static int
+cw1200_tx_h_rate_policy(struct cw1200_common *priv,
+			struct cw1200_txinfo *t,
+			struct wsm_tx *wsm)
+{
+	bool tx_policy_renew = false;
+
+	t->txpriv.rate_id = tx_policy_get(priv,
+		t->tx_info->control.rates, IEEE80211_TX_MAX_RATES,
+		&tx_policy_renew);
+	if (t->txpriv.rate_id == CW1200_INVALID_RATE_ID)
+		return -EFAULT;
+
+	wsm->flags |= t->txpriv.rate_id << 4;
+
+	t->rate = cw1200_get_tx_rate(priv,
+		&t->tx_info->control.rates[0]),
+	wsm->maxTxRate = t->rate->hw_value;
+	if (t->rate->flags & IEEE80211_TX_RC_MCS) {
+		if (cw1200_ht_greenfield(&priv->ht_info))
+			wsm->htTxParameters |=
+				__cpu_to_le32(WSM_HT_TX_GREENFIELD);
+		else
+			wsm->htTxParameters |=
+				__cpu_to_le32(WSM_HT_TX_MIXED);
+	}
+
+	if (tx_policy_renew) {
+		pr_debug("[TX] TX policy renew.\n");
+		/* It's not so optimal to stop TX queues every now and then.
+		 * Maybe it's better to reimplement task scheduling with
+		 * a counter. */
+		/* cw1200_tx_queues_lock(priv); */
+		/* Definetly better. TODO. */
+		wsm_lock_tx_async(priv);
+		cw1200_tx_queues_lock(priv);
+		if (queue_work(priv->workqueue,
+				&priv->tx_policy_upload_work) <= 0) {
+			cw1200_tx_queues_unlock(priv);
+			wsm_unlock_tx(priv);
+		}
+	}
+	return 0;
+}
+
+static bool
+cw1200_tx_h_pm_state(struct cw1200_common *priv,
+		     struct cw1200_txinfo *t)
+{
+	int was_buffered = 1;
+
+	if (t->txpriv.link_id == CW1200_LINK_ID_AFTER_DTIM &&
+			!priv->buffered_multicasts) {
+		priv->buffered_multicasts = true;
+		if (priv->sta_asleep_mask)
+			queue_work(priv->workqueue,
+				&priv->multicast_start_work);
+	}
+
+	if (t->txpriv.raw_link_id && t->txpriv.tid < CW1200_MAX_TID)
+		was_buffered = priv->link_id_db[t->txpriv.raw_link_id - 1]
+				.buffered[t->txpriv.tid]++;
+
+	return !was_buffered;
+}
+
+static void
+cw1200_tx_h_ba_stat(struct cw1200_common *priv,
+		    struct cw1200_txinfo *t)
+{
+	if (priv->join_status != CW1200_JOIN_STATUS_STA)
+		return;
+	if (!cw1200_is_ht(&priv->ht_info))
+		return;
+	if (!priv->setbssparams_done)
+		return;
+	if (!ieee80211_is_data(t->hdr->frame_control))
+		return;
+
+	spin_lock_bh(&priv->ba_lock);
+	priv->ba_acc += t->skb->len - t->hdrlen;
+	if (!(priv->ba_cnt_rx || priv->ba_cnt)) {
+		mod_timer(&priv->ba_timer,
+			jiffies + CW1200_BLOCK_ACK_INTERVAL);
+	}
+	priv->ba_cnt++;
+	spin_unlock_bh(&priv->ba_lock);
+}
+
+/* ******************************************************************** */
+
+void cw1200_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
+{
+	struct cw1200_common *priv = dev->priv;
+	struct cw1200_txinfo t = {
+		.skb = skb,
+		.queue = skb_get_queue_mapping(skb),
+		.tx_info = IEEE80211_SKB_CB(skb),
+		.hdr = (struct ieee80211_hdr *)skb->data,
+		.txpriv.tid = CW1200_MAX_TID,
+		.txpriv.rate_id = CW1200_INVALID_RATE_ID,
+	};
+	struct ieee80211_sta *sta;
+	struct wsm_tx *wsm;
+	bool tid_update = 0;
+	u8 flags = 0;
+	int ret;
+
+	if (priv->bh_error)
+		goto drop;
+
+	t.hdrlen = ieee80211_hdrlen(t.hdr->frame_control);
+	t.da = ieee80211_get_DA(t.hdr);
+	t.sta_priv =
+		(struct cw1200_sta_priv *)&t.tx_info->control.sta->drv_priv;
+
+	if (WARN_ON(t.queue >= 4))
+		goto drop;
+
+	ret = cw1200_tx_h_calc_link_ids(priv, &t);
+	if (ret)
+		goto drop;
+
+	pr_debug("[TX] TX %d bytes (queue: %d, link_id: %d (%d)).\n",
+			skb->len, t.queue, t.txpriv.link_id,
+			t.txpriv.raw_link_id);
+
+	cw1200_tx_h_pm(priv, &t);
+	cw1200_tx_h_calc_tid(priv, &t);
+	ret = cw1200_tx_h_crypt(priv, &t);
+	if (ret)
+		goto drop;
+	ret = cw1200_tx_h_align(priv, &t, &flags);
+	if (ret)
+		goto drop;
+	ret = cw1200_tx_h_action(priv, &t);
+	if (ret)
+		goto drop;
+	wsm = cw1200_tx_h_wsm(priv, &t);
+	if (!wsm) {
+		ret = -ENOMEM;
+		goto drop;
+	}
+	wsm->flags |= flags;
+	cw1200_tx_h_bt(priv, &t, wsm);
+	ret = cw1200_tx_h_rate_policy(priv, &t, wsm);
+	if (ret)
+		goto drop;
+
+	rcu_read_lock();
+	sta = rcu_dereference(t.tx_info->control.sta);
+
+	cw1200_tx_h_ba_stat(priv, &t);
+	spin_lock_bh(&priv->ps_state_lock);
+	{
+		tid_update = cw1200_tx_h_pm_state(priv, &t);
+		BUG_ON(cw1200_queue_put(&priv->tx_queue[t.queue],
+				t.skb, &t.txpriv));
+	}
+	spin_unlock_bh(&priv->ps_state_lock);
+
+	if (tid_update && sta)
+		ieee80211_sta_set_buffered(sta,
+				t.txpriv.tid, true);
+
+	rcu_read_unlock();
+
+	cw1200_bh_wakeup(priv);
+
+	return;
+
+drop:
+	cw1200_skb_dtor(priv, skb, &t.txpriv);
+	return;
+}
+
+/* ******************************************************************** */
+
+static int cw1200_handle_action_rx(struct cw1200_common *priv,
+				   struct sk_buff *skb)
+{
+	struct ieee80211_mgmt *mgmt = (void *)skb->data;
+
+	/* Filter block ACK negotiation: fully controlled by firmware */
+	if (mgmt->u.action.category == WLAN_CATEGORY_BACK)
+		return 1;
+
+	return 0;
+}
+
+static int cw1200_handle_pspoll(struct cw1200_common *priv,
+				struct sk_buff *skb)
+{
+	struct ieee80211_sta *sta;
+	struct ieee80211_pspoll *pspoll =
+		(struct ieee80211_pspoll *) skb->data;
+	int link_id = 0;
+	u32 pspoll_mask = 0;
+	int drop = 1;
+	int i;
+
+	if (priv->join_status != CW1200_JOIN_STATUS_AP)
+		goto done;
+	if (memcmp(priv->vif->addr, pspoll->bssid, ETH_ALEN))
+		goto done;
+
+	rcu_read_lock();
+	sta = ieee80211_find_sta(priv->vif, pspoll->ta);
+	if (sta) {
+		struct cw1200_sta_priv *sta_priv;
+		sta_priv = (struct cw1200_sta_priv *)&sta->drv_priv;
+		link_id = sta_priv->link_id;
+		pspoll_mask = BIT(sta_priv->link_id);
+	}
+	rcu_read_unlock();
+	if (!link_id)
+		goto done;
+
+	priv->pspoll_mask |= pspoll_mask;
+	drop = 0;
+
+	/* Do not report pspols if data for given link id is
+	 * queued already. */
+	for (i = 0; i < 4; ++i) {
+		if (cw1200_queue_get_num_queued(
+				&priv->tx_queue[i],
+				pspoll_mask)) {
+			cw1200_bh_wakeup(priv);
+			drop = 1;
+			break;
+		}
+	}
+	pr_debug("[RX] PSPOLL: %s\n", drop ? "local" : "fwd");
+done:
+	return drop;
+}
+
+/* ******************************************************************** */
+
+void cw1200_tx_confirm_cb(struct cw1200_common *priv,
+			  struct wsm_tx_confirm *arg)
+{
+	u8 queue_id = cw1200_queue_get_queue_id(arg->packetID);
+	struct cw1200_queue *queue = &priv->tx_queue[queue_id];
+	struct sk_buff *skb;
+	const struct cw1200_txpriv *txpriv;
+
+	pr_debug("[TX] TX confirm: %d, %d.\n",
+		arg->status, arg->ackFailures);
+
+	if (unlikely(cw1200_itp_tx_running(priv)))
+		return;
+
+	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) {
+		/* STA is stopped. */
+		return;
+	}
+
+	if (WARN_ON(queue_id >= 4))
+		return;
+
+	if (arg->status)
+		pr_debug("TX failed: %d.\n",
+				arg->status);
+
+	if ((arg->status == WSM_REQUEUE) &&
+	    (arg->flags & WSM_TX_STATUS_REQUEUE)) {
+		/* "Requeue" means "implicit suspend" */
+		struct wsm_suspend_resume suspend = {
+			.link_id = arg->link_id,
+			.stop = 1,
+			.multicast = !arg->link_id,
+		};
+		cw1200_suspend_resume(priv, &suspend);
+		wiphy_warn(priv->hw->wiphy, "Requeue for link_id %d (try %d). STAs asleep: 0x%.8X\n",
+			arg->link_id,
+			cw1200_queue_get_generation(arg->packetID) + 1,
+			priv->sta_asleep_mask);
+		WARN_ON(cw1200_queue_requeue(queue,
+				arg->packetID));
+		spin_lock_bh(&priv->ps_state_lock);
+		if (!arg->link_id) {
+			priv->buffered_multicasts = true;
+			if (priv->sta_asleep_mask) {
+				queue_work(priv->workqueue,
+					&priv->multicast_start_work);
+			}
+		}
+		spin_unlock_bh(&priv->ps_state_lock);
+	} else if (!WARN_ON(cw1200_queue_get_skb(
+			queue, arg->packetID, &skb, &txpriv))) {
+		struct ieee80211_tx_info *tx = IEEE80211_SKB_CB(skb);
+		int tx_count = arg->ackFailures;
+		u8 ht_flags = 0;
+		int i;
+
+		if (cw1200_ht_greenfield(&priv->ht_info))
+			ht_flags |= IEEE80211_TX_RC_GREEN_FIELD;
+
+		if (likely(!arg->status)) {
+			spin_lock(&priv->bss_loss_lock);
+			if ((priv->bss_loss_status == CW1200_BSS_LOSS_CONFIRMING) &&
+			    (priv->bss_loss_checking < BSS_LOSS_CHECKING_MAX_TRY)) {
+				priv->bss_loss_status = CW1200_BSS_LOSS_CHECKING;
+				priv->bss_loss_checking++;
+				spin_unlock(&priv->bss_loss_lock);
+				cancel_delayed_work(&priv->bss_loss_work);
+				queue_delayed_work(priv->workqueue,
+						   &priv->bss_loss_work, 0);
+			} else
+				spin_unlock(&priv->bss_loss_lock);
+			tx->flags |= IEEE80211_TX_STAT_ACK;
+			++tx_count;
+			cw1200_debug_txed(priv);
+			if (arg->flags & WSM_TX_STATUS_AGGREGATION) {
+				/* Do not report aggregation to mac80211:
+				 * it confuses minstrel a lot. */
+				/* tx->flags |= IEEE80211_TX_STAT_AMPDU; */
+				cw1200_debug_txed_agg(priv);
+			}
+		} else {
+			spin_lock(&priv->bss_loss_lock);
+			if (priv->bss_loss_status ==
+					CW1200_BSS_LOSS_CONFIRMING &&
+					priv->bss_loss_confirm_id ==
+					arg->packetID) {
+				priv->bss_loss_status =
+					CW1200_BSS_LOSS_CONFIRMED;
+				priv->bss_loss_checking = 0;
+				spin_unlock(&priv->bss_loss_lock);
+				cancel_delayed_work(&priv->bss_loss_work);
+				queue_delayed_work(priv->workqueue,
+						&priv->bss_loss_work, 0);
+			} else
+				spin_unlock(&priv->bss_loss_lock);
+
+			if (tx_count)
+				++tx_count;
+		}
+
+		for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) {
+			if (tx->status.rates[i].count >= tx_count) {
+				tx->status.rates[i].count = tx_count;
+				break;
+			}
+			tx_count -= tx->status.rates[i].count;
+			if (tx->status.rates[i].flags & IEEE80211_TX_RC_MCS)
+				tx->status.rates[i].flags |= ht_flags;
+		}
+
+		for (++i; i < IEEE80211_TX_MAX_RATES; ++i) {
+			tx->status.rates[i].count = 0;
+			tx->status.rates[i].idx = -1;
+		}
+
+		/* Pull off any crypto trailers that we added on */
+		if (tx->control.hw_key) {
+			skb_trim(skb, skb->len - tx->control.hw_key->icv_len);
+			if (tx->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
+				skb_trim(skb, skb->len - 8); /* MIC space */
+		}
+		cw1200_queue_remove(queue, arg->packetID);
+	}
+	cw1200_bh_wakeup(priv); /* XXX TODO:  Only wake if there are pending transmits.. */
+}
+
+static void cw1200_notify_buffered_tx(struct cw1200_common *priv,
+			       struct sk_buff *skb, int link_id, int tid)
+{
+	struct ieee80211_sta *sta;
+	struct ieee80211_hdr *hdr;
+	u8 *buffered;
+	u8 still_buffered = 0;
+
+	if (link_id && tid < CW1200_MAX_TID) {
+		buffered = priv->link_id_db
+				[link_id - 1].buffered;
+
+		spin_lock_bh(&priv->ps_state_lock);
+		if (!WARN_ON(!buffered[tid]))
+			still_buffered = --buffered[tid];
+		spin_unlock_bh(&priv->ps_state_lock);
+
+		if (!still_buffered && tid < CW1200_MAX_TID) {
+			hdr = (struct ieee80211_hdr *) skb->data;
+			rcu_read_lock();
+			sta = ieee80211_find_sta(priv->vif, hdr->addr1);
+			if (sta)
+				ieee80211_sta_set_buffered(sta, tid, false);
+			rcu_read_unlock();
+		}
+	}
+}
+
+void cw1200_skb_dtor(struct cw1200_common *priv,
+		     struct sk_buff *skb,
+		     const struct cw1200_txpriv *txpriv)
+{
+	skb_pull(skb, txpriv->offset);
+	if (txpriv->rate_id != CW1200_INVALID_RATE_ID) {
+		cw1200_notify_buffered_tx(priv, skb,
+				txpriv->raw_link_id, txpriv->tid);
+		tx_policy_put(priv, txpriv->rate_id);
+	}
+	if (likely(!cw1200_is_itp(priv)))
+		ieee80211_tx_status(priv->hw, skb);
+}
+
+static void
+cw1200_rx_h_ba_stat(struct cw1200_common *priv,
+		    size_t hdrlen, size_t skb_len)
+{
+	if (priv->join_status != CW1200_JOIN_STATUS_STA)
+		return;
+	if (!cw1200_is_ht(&priv->ht_info))
+		return;
+
+	spin_lock_bh(&priv->ba_lock);
+	priv->ba_acc_rx += skb_len - hdrlen;
+	if (!(priv->ba_cnt_rx || priv->ba_cnt)) {
+		mod_timer(&priv->ba_timer,
+			  jiffies + CW1200_BLOCK_ACK_INTERVAL);
+	}
+	priv->ba_cnt_rx++;
+	spin_unlock_bh(&priv->ba_lock);
+}
+
+void cw1200_rx_cb(struct cw1200_common *priv,
+		  struct wsm_rx *arg,
+		  struct sk_buff **skb_p)
+{
+	struct sk_buff *skb = *skb_p;
+	struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
+	struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
+	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
+	struct cw1200_link_entry *entry = NULL;
+#ifdef CONFIG_CW1200_PM
+	unsigned long grace_period;
+#endif
+	bool early_data = false;
+	bool p2p = priv->vif && priv->vif->p2p;
+	size_t hdrlen;
+	hdr->flag = 0;
+
+	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) {
+		/* STA is stopped. */
+		goto drop;
+	}
+
+	if (arg->link_id && arg->link_id <= CW1200_MAX_STA_IN_AP_MODE) {
+		entry =	&priv->link_id_db[arg->link_id - 1];
+		if (entry->status == CW1200_LINK_SOFT &&
+				ieee80211_is_data(frame->frame_control))
+			early_data = true;
+		entry->timestamp = jiffies;
+	} else if (p2p &&
+		   ieee80211_is_action(frame->frame_control) &&
+		   (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC)) {
+		pr_debug("[RX] Going to MAP&RESET link ID\n");
+
+		if (work_pending(&priv->linkid_reset_work))
+			WARN_ON(1);
+
+		memcpy(&priv->action_frame_sa[0],
+				ieee80211_get_SA(frame), ETH_ALEN);
+		priv->action_linkid = 0;
+		schedule_work(&priv->linkid_reset_work);
+	}
+
+	if (arg->link_id && p2p &&
+	    ieee80211_is_action(frame->frame_control) &&
+	    (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC)) {
+		/* Link ID already exists for the ACTION frame.
+		 * Reset and Remap */
+		if (work_pending(&priv->linkid_reset_work))
+			WARN_ON(1);
+		memcpy(&priv->action_frame_sa[0],
+				ieee80211_get_SA(frame), ETH_ALEN);
+		priv->action_linkid = arg->link_id;
+		schedule_work(&priv->linkid_reset_work);
+	}
+	if (unlikely(arg->status)) {
+		if (arg->status == WSM_STATUS_MICFAILURE) {
+			pr_debug("[RX] MIC failure.\n");
+			hdr->flag |= RX_FLAG_MMIC_ERROR;
+		} else if (arg->status == WSM_STATUS_NO_KEY_FOUND) {
+			pr_debug("[RX] No key found.\n");
+			goto drop;
+		} else {
+			pr_debug("[RX] Receive failure: %d.\n",
+				arg->status);
+			goto drop;
+		}
+	}
+
+	if (skb->len < sizeof(struct ieee80211_pspoll)) {
+		wiphy_warn(priv->hw->wiphy, "Mailformed SDU rx'ed. Size is lesser than IEEE header.\n");
+		goto drop;
+	}
+
+	if (unlikely(ieee80211_is_pspoll(frame->frame_control)))
+		if (cw1200_handle_pspoll(priv, skb))
+			goto drop;
+
+	hdr->mactime = 0; /* Not supported by WSM */
+	hdr->band = ((arg->channelNumber & 0xff00) || (arg->channelNumber > 14)) ?
+			IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
+	hdr->freq = ieee80211_channel_to_frequency(
+			arg->channelNumber,
+			hdr->band);
+
+	if (arg->rxedRate >= 14) {
+		hdr->flag |= RX_FLAG_HT;
+		hdr->rate_idx = arg->rxedRate - 14;
+	} else if (arg->rxedRate >= 4) {
+		hdr->rate_idx = arg->rxedRate - 2;
+	} else {
+		hdr->rate_idx = arg->rxedRate;
+	}
+
+	hdr->signal = (s8)arg->rcpiRssi;
+	hdr->antenna = 0;
+
+	hdrlen = ieee80211_hdrlen(frame->frame_control);
+
+	if (WSM_RX_STATUS_ENCRYPTION(arg->flags)) {
+		size_t iv_len = 0, icv_len = 0;
+
+		hdr->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED;
+
+		/* Oops... There is no fast way to ask mac80211 about
+		 * IV/ICV lengths. Even defineas are not exposed.*/
+		switch (WSM_RX_STATUS_ENCRYPTION(arg->flags)) {
+		case WSM_RX_STATUS_WEP:
+			iv_len = 4 /* WEP_IV_LEN */;
+			icv_len = 4 /* WEP_ICV_LEN */;
+			break;
+		case WSM_RX_STATUS_TKIP:
+			iv_len = 8 /* TKIP_IV_LEN */;
+			icv_len = 4 /* TKIP_ICV_LEN */
+				+ 8 /*MICHAEL_MIC_LEN*/;
+			hdr->flag |= RX_FLAG_MMIC_STRIPPED;
+			break;
+		case WSM_RX_STATUS_AES:
+			iv_len = 8 /* CCMP_HDR_LEN */;
+			icv_len = 8 /* CCMP_MIC_LEN */;
+			break;
+		case WSM_RX_STATUS_WAPI:
+			iv_len = 18 /* WAPI_HDR_LEN */;
+			icv_len = 16 /* WAPI_MIC_LEN */;
+			break;
+		default:
+			WARN_ON("Unknown encryption type");
+			goto drop;
+		}
+
+		/* Firmware strips ICV in case of MIC failure. */
+		if (arg->status == WSM_STATUS_MICFAILURE)
+			icv_len = 0;
+
+		if (skb->len < hdrlen + iv_len + icv_len) {
+			wiphy_warn(priv->hw->wiphy, "Malformed SDU rx'ed. Size is lesser than crypto headers.\n");
+			goto drop;
+		}
+
+		/* Remove IV, ICV and MIC */
+		skb_trim(skb, skb->len - icv_len);
+		memmove(skb->data + iv_len, skb->data, hdrlen);
+		skb_pull(skb, iv_len);
+	}
+
+	/* Remove TSF from the end of frame */
+	if (arg->flags & WSM_RX_STATUS_TSF_INCLUDED) {
+		memcpy(&hdr->mactime, skb->data + skb->len - 8, 8);
+		hdr->mactime = le64_to_cpu(hdr->mactime);
+		if (skb->len >= 8)
+			skb_trim(skb, skb->len - 8);
+	}
+
+	cw1200_debug_rxed(priv);
+	if (arg->flags & WSM_RX_STATUS_AGGREGATE)
+		cw1200_debug_rxed_agg(priv);
+
+	if (ieee80211_is_action(frame->frame_control) &&
+			(arg->flags & WSM_RX_STATUS_ADDRESS1)) {
+		if (cw1200_handle_action_rx(priv, skb))
+			return;
+	} else if (ieee80211_is_beacon(frame->frame_control) &&
+		   !arg->status &&
+		   !memcmp(ieee80211_get_SA(frame), priv->join_bssid,
+			   ETH_ALEN)) {
+		const u8 *tim_ie;
+		u8 *ies = ((struct ieee80211_mgmt *)
+			  (skb->data))->u.beacon.variable;
+		size_t ies_len = skb->len - (ies - (u8 *)(skb->data));
+
+		tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies, ies_len);
+		if (tim_ie) {
+			struct ieee80211_tim_ie *tim =
+				(struct ieee80211_tim_ie *)&tim_ie[2];
+
+			if (priv->join_dtim_period != tim->dtim_period) {
+				priv->join_dtim_period = tim->dtim_period;
+				queue_work(priv->workqueue,
+					&priv->set_beacon_wakeup_period_work);
+			}
+		}
+		if (priv->disable_beacon_filter) {
+			priv->disable_beacon_filter = false;
+			queue_work(priv->workqueue,
+				&priv->update_filtering_work);
+		}
+	}
+
+	if (ieee80211_is_data(frame->frame_control))
+		cw1200_rx_h_ba_stat(priv, hdrlen, skb->len);
+
+#ifdef CONFIG_CW1200_PM
+	/* Stay awake for 1sec. after frame is received to give
+	 * userspace chance to react and acquire appropriate
+	 * wakelock. */
+	if (ieee80211_is_auth(frame->frame_control))
+		grace_period = 5 * HZ;
+	else if (ieee80211_is_deauth(frame->frame_control))
+		grace_period = 5 * HZ;
+	else
+		grace_period = 1 * HZ;
+	cw1200_pm_stay_awake(&priv->pm_state, grace_period);
+#endif
+	if (unlikely(cw1200_itp_rxed(priv, skb)))
+		consume_skb(skb);
+	else if (unlikely(early_data)) {
+		spin_lock_bh(&priv->ps_state_lock);
+		/* Double-check status with lock held */
+		if (entry->status == CW1200_LINK_SOFT)
+			skb_queue_tail(&entry->rx_queue, skb);
+		else
+			ieee80211_rx_irqsafe(priv->hw, skb);
+		spin_unlock_bh(&priv->ps_state_lock);
+	} else {
+		ieee80211_rx_irqsafe(priv->hw, skb);
+	}
+	*skb_p = NULL;
+
+	return;
+
+drop:
+	/* TODO: update failure counters */
+	return;
+}
+
+/* ******************************************************************** */
+/* Security								*/
+
+int cw1200_alloc_key(struct cw1200_common *priv)
+{
+	int idx;
+
+	idx = ffs(~priv->key_map) - 1;
+	if (idx < 0 || idx > WSM_KEY_MAX_INDEX)
+		return -1;
+
+	priv->key_map |= BIT(idx);
+	priv->keys[idx].entryIndex = idx;
+	return idx;
+}
+
+void cw1200_free_key(struct cw1200_common *priv, int idx)
+{
+	BUG_ON(!(priv->key_map & BIT(idx)));
+	memset(&priv->keys[idx], 0, sizeof(priv->keys[idx]));
+	priv->key_map &= ~BIT(idx);
+}
+
+void cw1200_free_keys(struct cw1200_common *priv)
+{
+	memset(&priv->keys, 0, sizeof(priv->keys));
+	priv->key_map = 0;
+}
+
+int cw1200_upload_keys(struct cw1200_common *priv)
+{
+	int idx, ret = 0;
+	for (idx = 0; idx <= WSM_KEY_MAX_INDEX; ++idx)
+		if (priv->key_map & BIT(idx)) {
+			ret = wsm_add_key(priv, &priv->keys[idx]);
+			if (ret < 0)
+				break;
+		}
+	return ret;
+}
+
+/* Workaround for WFD test case 6.1.10 */
+void cw1200_link_id_reset(struct work_struct *work)
+{
+	struct cw1200_common *priv =
+		container_of(work, struct cw1200_common, linkid_reset_work);
+	int temp_linkid;
+
+	if (!priv->action_linkid) {
+		/* In GO mode we can receive ACTION frames without a linkID */
+		temp_linkid = cw1200_alloc_link_id(priv,
+				&priv->action_frame_sa[0]);
+		WARN_ON(!temp_linkid);
+		if (temp_linkid) {
+			/* Make sure we execute the WQ */
+			flush_workqueue(priv->workqueue);
+			/* Release the link ID */
+			spin_lock_bh(&priv->ps_state_lock);
+			priv->link_id_db[temp_linkid - 1].prev_status =
+				priv->link_id_db[temp_linkid - 1].status;
+			priv->link_id_db[temp_linkid - 1].status =
+				CW1200_LINK_RESET;
+			spin_unlock_bh(&priv->ps_state_lock);
+			wsm_lock_tx_async(priv);
+			if (queue_work(priv->workqueue,
+					&priv->link_id_work) <= 0)
+				wsm_unlock_tx(priv);
+		}
+	} else {
+		spin_lock_bh(&priv->ps_state_lock);
+		priv->link_id_db[priv->action_linkid - 1].prev_status =
+			priv->link_id_db[priv->action_linkid - 1].status;
+		priv->link_id_db[priv->action_linkid - 1].status =
+			CW1200_LINK_RESET_REMAP;
+		spin_unlock_bh(&priv->ps_state_lock);
+		wsm_lock_tx_async(priv);
+		if (queue_work(priv->workqueue, &priv->link_id_work) <= 0)
+			wsm_unlock_tx(priv);
+		flush_workqueue(priv->workqueue);
+	}
+}
+
diff --git a/drivers/staging/cw1200/txrx.h b/drivers/staging/cw1200/txrx.h
new file mode 100644
index 0000000..9c1342e
--- /dev/null
+++ b/drivers/staging/cw1200/txrx.h
@@ -0,0 +1,94 @@
+/*
+ * Datapath interface for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@stericsson.com>
+ *
+ * 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.
+ */
+
+#ifndef CW1200_TXRX_H
+#define CW1200_TXRX_H
+
+#include <linux/list.h>
+
+/* extern */ struct ieee80211_hw;
+/* extern */ struct sk_buff;
+/* extern */ struct wsm_tx;
+/* extern */ struct wsm_rx;
+/* extern */ struct wsm_tx_confirm;
+/* extern */ struct cw1200_txpriv;
+
+struct tx_policy {
+	union {
+		__le32 tbl[3];
+		u8 raw[12];
+	};
+	u8  defined;		/* TODO: u32 or u8, profile and select best */
+	u8  usage_count;	/* --// -- */
+	u8  retry_count;	/* --// -- */
+	u8  uploaded;
+};
+
+struct tx_policy_cache_entry {
+	struct tx_policy policy;
+	struct list_head link;
+};
+
+#define TX_POLICY_CACHE_SIZE	(8)
+struct tx_policy_cache {
+	struct tx_policy_cache_entry cache[TX_POLICY_CACHE_SIZE];
+	struct list_head used;
+	struct list_head free;
+	spinlock_t lock;
+};
+
+/* ******************************************************************** */
+/* TX policy cache							*/
+/* Intention of TX policy cache is an overcomplicated WSM API.
+ * Device does not accept per-PDU tx retry sequence.
+ * It uses "tx retry policy id" instead, so driver code has to sync
+ * linux tx retry sequences with a retry policy table in the device.
+ */
+void tx_policy_init(struct cw1200_common *priv);
+void tx_policy_upload_work(struct work_struct *work);
+void tx_policy_clean(struct cw1200_common *priv);
+
+/* ******************************************************************** */
+/* TX implementation							*/
+
+u32 cw1200_rate_mask_to_wsm(struct cw1200_common *priv,
+			       u32 rates);
+void cw1200_tx(struct ieee80211_hw *dev, struct sk_buff *skb);
+void cw1200_skb_dtor(struct cw1200_common *priv,
+		     struct sk_buff *skb,
+		     const struct cw1200_txpriv *txpriv);
+
+/* ******************************************************************** */
+/* WSM callbacks							*/
+
+void cw1200_tx_confirm_cb(struct cw1200_common *priv,
+			  struct wsm_tx_confirm *arg);
+void cw1200_rx_cb(struct cw1200_common *priv,
+		  struct wsm_rx *arg,
+		  struct sk_buff **skb_p);
+
+/* ******************************************************************** */
+/* Timeout								*/
+
+void cw1200_tx_timeout(struct work_struct *work);
+
+/* ******************************************************************** */
+/* Security								*/
+int cw1200_alloc_key(struct cw1200_common *priv);
+void cw1200_free_key(struct cw1200_common *priv, int idx);
+void cw1200_free_keys(struct cw1200_common *priv);
+int cw1200_upload_keys(struct cw1200_common *priv);
+
+/* ******************************************************************** */
+/* Workaround for WFD test case 6.1.10					*/
+void cw1200_link_id_reset(struct work_struct *work);
+
+#endif /* CW1200_TXRX_H */
-- 
1.7.11.7