--- /dev/null
+/*
+ * Datapath implementation for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
+ *
+ * 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 "sta.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));
+
+ /* 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) {
+ 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 (retries > 0x0F) {
+ rates[i].count = 0x0f;
+ retries = 0x0F;
+ }
+ policy->tbl[off] |= __cpu_to_le32(retries << shift);
+ policy->retry_count += retries;
+ }
+
+ pr_debug("[TX policy] Policy (%zu): %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);
+}
+
+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 (WARN_ON(entry->policy.usage_count)) {
+ 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 (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 (locked && !usage) {
+ /* Unlock TX queues. */
+ cw1200_tx_queues_unlock(priv);
+ }
+ spin_unlock_bh(&cache->lock);
+}
+
+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 = {
+ .num = 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_tx_rate_retry_policy *dst =
+ &arg.tbl[arg.num];
+ dst->index = i;
+ dst->short_retries = priv->short_frame_max_tx_count;
+ dst->long_retries = priv->long_frame_max_tx_count;
+
+ dst->flags = WSM_TX_RATE_POLICY_FLAG_TERMINATE_WHEN_FINISHED |
+ WSM_TX_RATE_POLICY_FLAG_COUNT_INITIAL_TRANSMIT;
+ memcpy(dst->rate_count_indices, src->tbl,
+ sizeof(dst->rate_count_indices));
+ src->uploaded = 1;
+ ++arg.num;
+ }
+ }
+ spin_unlock_bh(&cache->lock);
+ cw1200_debug_tx_cache_miss(priv);
+ pr_debug("[TX policy] Upload %d policies\n", arg.num);
+ 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");
+ 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 ieee80211_sta *sta;
+ 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 (t->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,
+ "No more link IDs available.\n");
+ 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->sta && (t->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 (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: %zu\n",
+ offset);
+ return -EINVAL;
+ }
+
+ if (skb_headroom(t->skb) < offset) {
+ wiphy_err(priv->hw->wiphy,
+ "Bug: no space allocated for DMA alignment. 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. 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->queue_id = 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->bt_present)
+ return;
+
+ if (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];
+ __be16 *ethertype = (__be16 *)&payload[6];
+ if (be16_to_cpu(*ethertype) == ETH_P_PAE)
+ priority = WSM_EPTA_PRIORITY_EAPOL;
+ } else if (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 (le16_to_cpu(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 = cpu_to_le16(priv->listen_interval);
+ }
+ }
+
+ if (!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->queue_id == WSM_QUEUE_VOICE))
+ priority = WSM_EPTA_PRIORITY_VOICE;
+ else if ((wsm->queue_id == 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->max_tx_rate = t->rate->hw_value;
+ if (t->rate->flags & IEEE80211_TX_RC_MCS) {
+ if (cw1200_ht_greenfield(&priv->ht_info))
+ wsm->ht_tx_parameters |=
+ __cpu_to_le32(WSM_HT_TX_GREENFIELD);
+ else
+ wsm->ht_tx_parameters |=
+ __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.
+ * Better to reimplement task scheduling with
+ * a counter. 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;
+}
+
+/* ******************************************************************** */
+
+void cw1200_tx(struct ieee80211_hw *dev,
+ struct ieee80211_tx_control *control,
+ 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);
+ if (control) {
+ t.sta = control->sta;
+ t.sta_priv = (struct cw1200_sta_priv *)&t.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.sta);
+
+ 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,
+ int link_id,
+ struct wsm_tx_confirm *arg)
+{
+ u8 queue_id = cw1200_queue_get_queue_id(arg->packet_id);
+ 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->ack_failures);
+
+ if (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 = link_id,
+ .stop = 1,
+ .multicast = !link_id,
+ };
+ cw1200_suspend_resume(priv, &suspend);
+ wiphy_warn(priv->hw->wiphy, "Requeue for link_id %d (try %d). STAs asleep: 0x%.8X\n",
+ link_id,
+ cw1200_queue_get_generation(arg->packet_id) + 1,
+ priv->sta_asleep_mask);
+ cw1200_queue_requeue(queue, arg->packet_id);
+ spin_lock_bh(&priv->ps_state_lock);
+ if (!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 (!cw1200_queue_get_skb(queue, arg->packet_id,
+ &skb, &txpriv)) {
+ struct ieee80211_tx_info *tx = IEEE80211_SKB_CB(skb);
+ int tx_count = arg->ack_failures;
+ u8 ht_flags = 0;
+ int i;
+
+ if (cw1200_ht_greenfield(&priv->ht_info))
+ ht_flags |= IEEE80211_TX_RC_GREEN_FIELD;
+
+ spin_lock(&priv->bss_loss_lock);
+ if (priv->bss_loss_state &&
+ arg->packet_id == priv->bss_loss_confirm_id) {
+ if (arg->status) {
+ /* Recovery failed */
+ __cw1200_cqm_bssloss_sm(priv, 0, 0, 1);
+ } else {
+ /* Recovery succeeded */
+ __cw1200_cqm_bssloss_sm(priv, 0, 1, 0);
+ }
+ }
+ spin_unlock(&priv->bss_loss_lock);
+
+ if (!arg->status) {
+ 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 {
+ 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->packet_id);
+ }
+ /* XXX TODO: Only wake if there are pending transmits.. */
+ cw1200_bh_wakeup(priv);
+}
+
+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);
+ }
+ ieee80211_tx_status(priv->hw, skb);
+}
+
+void cw1200_rx_cb(struct cw1200_common *priv,
+ struct wsm_rx *arg,
+ int link_id,
+ 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;
+ unsigned long grace_period;
+
+ bool early_data = false;
+ bool p2p = priv->vif && priv->vif->p2p;
+ size_t hdrlen;
+ hdr->flag = 0;
+
+ if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) {
+ /* STA is stopped. */
+ goto drop;
+ }
+
+ if (link_id && link_id <= CW1200_MAX_STA_IN_AP_MODE) {
+ entry = &priv->link_id_db[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");
+ WARN_ON(work_pending(&priv->linkid_reset_work));
+ memcpy(&priv->action_frame_sa[0],
+ ieee80211_get_SA(frame), ETH_ALEN);
+ priv->action_linkid = 0;
+ schedule_work(&priv->linkid_reset_work);
+ }
+
+ if (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
+ */
+ WARN_ON(work_pending(&priv->linkid_reset_work));
+ memcpy(&priv->action_frame_sa[0],
+ ieee80211_get_SA(frame), ETH_ALEN);
+ priv->action_linkid = link_id;
+ schedule_work(&priv->linkid_reset_work);
+ }
+ if (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 (ieee80211_is_pspoll(frame->frame_control))
+ if (cw1200_handle_pspoll(priv, skb))
+ goto drop;
+
+ hdr->band = ((arg->channel_number & 0xff00) ||
+ (arg->channel_number > 14)) ?
+ IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
+ hdr->freq = ieee80211_channel_to_frequency(
+ arg->channel_number,
+ hdr->band);
+
+ if (arg->rx_rate >= 14) {
+ hdr->flag |= RX_FLAG_HT;
+ hdr->rate_idx = arg->rx_rate - 14;
+ } else if (arg->rx_rate >= 4) {
+ hdr->rate_idx = arg->rx_rate - 2;
+ } else {
+ hdr->rate_idx = arg->rx_rate;
+ }
+
+ hdr->signal = (s8)arg->rcpi_rssi;
+ 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:
+ pr_warn("Unknown encryption type %d\n",
+ WSM_RX_STATUS_ENCRYPTION(arg->flags));
+ 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);
+ } else {
+ hdr->mactime = 0;
+ }
+
+ 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 && priv->vif &&
+ ether_addr_equal(ieee80211_get_SA(frame), priv->vif->bss_conf.bssid)) {
+ 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);
+ }
+ }
+
+ /* Disable beacon filter once we're associated... */
+ if (priv->disable_beacon_filter &&
+ (priv->vif->bss_conf.assoc ||
+ priv->vif->bss_conf.ibss_joined)) {
+ priv->disable_beacon_filter = false;
+ queue_work(priv->workqueue,
+ &priv->update_filtering_work);
+ }
+ }
+
+ /* Stay awake 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 (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].index = 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);
+ }
+}
+
+int cw1200_find_link_id(struct cw1200_common *priv, const u8 *mac)
+{
+ int i, ret = 0;
+ spin_lock_bh(&priv->ps_state_lock);
+ for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
+ if (!memcmp(mac, priv->link_id_db[i].mac, ETH_ALEN) &&
+ priv->link_id_db[i].status) {
+ priv->link_id_db[i].timestamp = jiffies;
+ ret = i + 1;
+ break;
+ }
+ }
+ spin_unlock_bh(&priv->ps_state_lock);
+ return ret;
+}
+
+int cw1200_alloc_link_id(struct cw1200_common *priv, const u8 *mac)
+{
+ int i, ret = 0;
+ unsigned long max_inactivity = 0;
+ unsigned long now = jiffies;
+
+ spin_lock_bh(&priv->ps_state_lock);
+ for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
+ if (!priv->link_id_db[i].status) {
+ ret = i + 1;
+ break;
+ } else if (priv->link_id_db[i].status != CW1200_LINK_HARD &&
+ !priv->tx_queue_stats.link_map_cache[i + 1]) {
+ unsigned long inactivity =
+ now - priv->link_id_db[i].timestamp;
+ if (inactivity < max_inactivity)
+ continue;
+ max_inactivity = inactivity;
+ ret = i + 1;
+ }
+ }
+ if (ret) {
+ struct cw1200_link_entry *entry = &priv->link_id_db[ret - 1];
+ pr_debug("[AP] STA added, link_id: %d\n", ret);
+ entry->status = CW1200_LINK_RESERVE;
+ memcpy(&entry->mac, mac, ETH_ALEN);
+ memset(&entry->buffered, 0, CW1200_MAX_TID);
+ skb_queue_head_init(&entry->rx_queue);
+ wsm_lock_tx_async(priv);
+ if (queue_work(priv->workqueue, &priv->link_id_work) <= 0)
+ wsm_unlock_tx(priv);
+ } else {
+ wiphy_info(priv->hw->wiphy,
+ "[AP] Early: no more link IDs available.\n");
+ }
+
+ spin_unlock_bh(&priv->ps_state_lock);
+ return ret;
+}
+
+void cw1200_link_id_work(struct work_struct *work)
+{
+ struct cw1200_common *priv =
+ container_of(work, struct cw1200_common, link_id_work);
+ wsm_flush_tx(priv);
+ cw1200_link_id_gc_work(&priv->link_id_gc_work.work);
+ wsm_unlock_tx(priv);
+}
+
+void cw1200_link_id_gc_work(struct work_struct *work)
+{
+ struct cw1200_common *priv =
+ container_of(work, struct cw1200_common, link_id_gc_work.work);
+ struct wsm_reset reset = {
+ .reset_statistics = false,
+ };
+ struct wsm_map_link map_link = {
+ .link_id = 0,
+ };
+ unsigned long now = jiffies;
+ unsigned long next_gc = -1;
+ long ttl;
+ bool need_reset;
+ u32 mask;
+ int i;
+
+ if (priv->join_status != CW1200_JOIN_STATUS_AP)
+ return;
+
+ wsm_lock_tx(priv);
+ spin_lock_bh(&priv->ps_state_lock);
+ for (i = 0; i < CW1200_MAX_STA_IN_AP_MODE; ++i) {
+ need_reset = false;
+ mask = BIT(i + 1);
+ if (priv->link_id_db[i].status == CW1200_LINK_RESERVE ||
+ (priv->link_id_db[i].status == CW1200_LINK_HARD &&
+ !(priv->link_id_map & mask))) {
+ if (priv->link_id_map & mask) {
+ priv->sta_asleep_mask &= ~mask;
+ priv->pspoll_mask &= ~mask;
+ need_reset = true;
+ }
+ priv->link_id_map |= mask;
+ if (priv->link_id_db[i].status != CW1200_LINK_HARD)
+ priv->link_id_db[i].status = CW1200_LINK_SOFT;
+ memcpy(map_link.mac_addr, priv->link_id_db[i].mac,
+ ETH_ALEN);
+ spin_unlock_bh(&priv->ps_state_lock);
+ if (need_reset) {
+ reset.link_id = i + 1;
+ wsm_reset(priv, &reset);
+ }
+ map_link.link_id = i + 1;
+ wsm_map_link(priv, &map_link);
+ next_gc = min(next_gc, CW1200_LINK_ID_GC_TIMEOUT);
+ spin_lock_bh(&priv->ps_state_lock);
+ } else if (priv->link_id_db[i].status == CW1200_LINK_SOFT) {
+ ttl = priv->link_id_db[i].timestamp - now +
+ CW1200_LINK_ID_GC_TIMEOUT;
+ if (ttl <= 0) {
+ need_reset = true;
+ priv->link_id_db[i].status = CW1200_LINK_OFF;
+ priv->link_id_map &= ~mask;
+ priv->sta_asleep_mask &= ~mask;
+ priv->pspoll_mask &= ~mask;
+ eth_zero_addr(map_link.mac_addr);
+ spin_unlock_bh(&priv->ps_state_lock);
+ reset.link_id = i + 1;
+ wsm_reset(priv, &reset);
+ spin_lock_bh(&priv->ps_state_lock);
+ } else {
+ next_gc = min_t(unsigned long, next_gc, ttl);
+ }
+ } else if (priv->link_id_db[i].status == CW1200_LINK_RESET ||
+ priv->link_id_db[i].status ==
+ CW1200_LINK_RESET_REMAP) {
+ int status = priv->link_id_db[i].status;
+ priv->link_id_db[i].status =
+ priv->link_id_db[i].prev_status;
+ priv->link_id_db[i].timestamp = now;
+ reset.link_id = i + 1;
+ spin_unlock_bh(&priv->ps_state_lock);
+ wsm_reset(priv, &reset);
+ if (status == CW1200_LINK_RESET_REMAP) {
+ memcpy(map_link.mac_addr,
+ priv->link_id_db[i].mac,
+ ETH_ALEN);
+ map_link.link_id = i + 1;
+ wsm_map_link(priv, &map_link);
+ next_gc = min(next_gc,
+ CW1200_LINK_ID_GC_TIMEOUT);
+ }
+ spin_lock_bh(&priv->ps_state_lock);
+ }
+ if (need_reset) {
+ skb_queue_purge(&priv->link_id_db[i].rx_queue);
+ pr_debug("[AP] STA removed, link_id: %d\n",
+ reset.link_id);
+ }
+ }
+ spin_unlock_bh(&priv->ps_state_lock);
+ if (next_gc != -1)
+ queue_delayed_work(priv->workqueue,
+ &priv->link_id_gc_work, next_gc);
+ wsm_unlock_tx(priv);
+}
Code Review / kvmfornfv.git / blobdiff