The patch implements datapath for the cw1200 device driver.
Signed-off-by: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
---
drivers/staging/cw1200/txrx.c | 1366 +++++++++++++++++++++++++++++++++++++++++
drivers/staging/cw1200/txrx.h | 95 +++
2 files changed, 1461 insertions(+), 0 deletions(-)
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..39e3c03
--- /dev/null
+++ b/drivers/staging/cw1200/txrx.c
@@ -0,0 +1,1366 @@
+/*
+ * Datapath implementation for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
+ *
+ * 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 "cw1200.h"
+#include "wsm.h"
+#include "bh.h"
+#include "ap.h"
+#include "debug.h"
+
+#if defined(CONFIG_CW1200_TX_POLICY_DEBUG)
+#define tx_policy_printk(...) printk(__VA_ARGS__)
+#else
+#define tx_policy_printk(...)
+#endif
+
+#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)
+{
+ tx_policy_printk(KERN_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;
+ }
+
+ tx_policy_printk(KERN_DEBUG "[TX policy] Policy (%ld): " \
+ "%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;
+}
+
+/* ******************************************************************** */
+/* 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) {
+ tx_policy_printk(KERN_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;
+ tx_policy_printk(KERN_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);
+ tx_policy_printk(KERN_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);
+
+ tx_policy_printk(KERN_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;
+ }
+}
+
+/* IV/ICV injection. */
+/* TODO: Quite unoptimal. It's better co modify mac80211
+ * to reserve space for IV */
+static int
+cw1200_tx_h_crypt(struct cw1200_common *priv,
+ struct cw1200_txinfo *t)
+{
+ size_t iv_len;
+ size_t icv_len;
+ u8 *icv;
+ u8 *newhdr;
+
+ if (!t->tx_info->control.hw_key ||
+ !(t->hdr->frame_control &
+ __cpu_to_le32(IEEE80211_FCTL_PROTECTED)))
+ return 0;
+
+ iv_len = t->tx_info->control.hw_key->iv_len;
+ icv_len = t->tx_info->control.hw_key->icv_len;
+
+ if (t->tx_info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
+ icv_len += 8; /* MIC */
+
+ if ((skb_headroom(t->skb) + skb_tailroom(t->skb) <
+ iv_len + icv_len + WSM_TX_EXTRA_HEADROOM) ||
+ (skb_headroom(t->skb) <
+ iv_len + WSM_TX_EXTRA_HEADROOM)) {
+ wiphy_err(priv->hw->wiphy,
+ "Bug: no space allocated for crypto headers.\n"
+ "headroom: %d, tailroom: %d, "
+ "req_headroom: %ld, req_tailroom: %ld\n"
+ "Please fix it in cw1200_get_skb().\n",
+ skb_headroom(t->skb), skb_tailroom(t->skb),
+ iv_len + WSM_TX_EXTRA_HEADROOM, icv_len);
+ return -ENOMEM;
+ } else if (skb_tailroom(t->skb) < icv_len) {
+ size_t offset = icv_len - skb_tailroom(t->skb);
+ u8 *p;
+ wiphy_warn(priv->hw->wiphy,
+ "Slowpath: tailroom is not big enough. "
+ "Req: %ld, got: %d.\n",
+ icv_len, skb_tailroom(t->skb));
+
+ p = skb_push(t->skb, offset);
+ memmove(p, &p[offset], t->skb->len - offset);
+ skb_trim(t->skb, t->skb->len - offset);
+ }
+
+ newhdr = skb_push(t->skb, iv_len);
+ memmove(newhdr, newhdr + iv_len, t->hdrlen);
+ t->hdr = (struct ieee80211_hdr *) newhdr;
+ t->hdrlen += iv_len;
+ icv = skb_put(t->skb, icv_len);
+
+ 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: %ld\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) {
+ txrx_printk(KERN_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;
+ }
+
+ txrx_printk(KERN_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) {
+ tx_policy_printk(KERN_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++) {
+ mod_timer(&priv->ba_timer,
+ jiffies + CW1200_BLOCK_ACK_INTERVAL);
+ }
+ 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;
+
+ 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;
+
+ txrx_printk(KERN_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;
+ }
+ }
+ txrx_printk(KERN_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;
+
+ txrx_printk(KERN_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)
+ txrx_printk(KERN_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)) {
+ tx->flags |= IEEE80211_TX_STAT_ACK;
+ priv->cqm_tx_failure_count = 0;
+ ++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;
+ 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);
+
+ /* TODO: Update TX failure counters */
+ if (unlikely(priv->cqm_tx_failure_thold &&
+ (++priv->cqm_tx_failure_count >
+ priv->cqm_tx_failure_thold))) {
+ priv->cqm_tx_failure_thold = 0;
+ queue_work(priv->workqueue,
+ &priv->tx_failure_work);
+ }
+ 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;
+ }
+
+
+ cw1200_queue_remove(queue, arg->packetID);
+ }
+}
+
+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);
+}
+
+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;
+#if defined(CONFIG_CW1200_USE_STE_EXTENSIONS)
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
+#endif
+ struct cw1200_link_entry *entry = NULL;
+ unsigned long grace_period;
+ bool early_data = false;
+ 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;
+ }
+#if defined(CONFIG_CW1200_USE_STE_EXTENSIONS)
+ else if ((priv->vif->p2p == WSM_START_MODE_P2P_GO)
+ && ieee80211_is_action(frame->frame_control)
+ && (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC)) {
+ txrx_printk(KERN_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 && (priv->vif->p2p == WSM_START_MODE_P2P_GO)
+ && 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);
+ }
+#endif
+ if (unlikely(arg->status)) {
+ if (arg->status == WSM_STATUS_MICFAILURE) {
+ txrx_printk(KERN_DEBUG "[RX] MIC failure.\n");
+ hdr->flag |= RX_FLAG_MMIC_ERROR;
+ } else if (arg->status == WSM_STATUS_NO_KEY_FOUND) {
+ txrx_printk(KERN_DEBUG "[RX] No key found.\n");
+ goto drop;
+ } else {
+ txrx_printk(KERN_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 > 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;
+
+ if (WSM_RX_STATUS_ENCRYPTION(arg->flags)) {
+ size_t iv_len = 0, icv_len = 0;
+ size_t hdrlen = ieee80211_hdrlen(frame->frame_control);
+
+ 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, "Mailformed 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);
+ }
+
+ 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 (unlikely(priv->disable_beacon_filter) &&
+ !arg->status &&
+ ieee80211_is_beacon(frame->frame_control) &&
+ !memcmp(ieee80211_get_SA(frame), priv->join_bssid,
+ ETH_ALEN)) {
+ priv->disable_beacon_filter = false;
+ queue_work(priv->workqueue, &priv->update_filtering_work);
+ }
+
+ /* 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);
+
+ 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;
+}
+#if defined(CONFIG_CW1200_USE_STE_EXTENSIONS)
+/* 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);
+ }
+}
+#endif
diff --git a/drivers/staging/cw1200/txrx.h b/drivers/staging/cw1200/txrx.h
new file mode 100644
index 0000000..f3b2023
--- /dev/null
+++ b/drivers/staging/cw1200/txrx.h
@@ -0,0 +1,95 @@
+/*
+ * Datapath interface for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
+ *
+ * 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);
+
+/* ******************************************************************** */
+/* 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 */
+#if defined(CONFIG_CW1200_USE_STE_EXTENSIONS)
+void cw1200_link_id_reset(struct work_struct *work);
+#endif
+
+#endif /* CW1200_TXRX_H */
--
1.7.9
--
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