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ubuntu-linux-kernel/drivers/net/wireless/st/cw1200/txrx.c

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2024-04-01 15:06:58 +00:00
/*
* 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 = 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)) ?
NL80211_BAND_5GHZ : NL80211_BAND_2GHZ;
hdr->freq = ieee80211_channel_to_frequency(
arg->channel_number,
hdr->band);
if (arg->rx_rate >= 14) {
hdr->encoding = RX_ENC_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);
}