/*
* Copyright (c) 2008-2009 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/slab.h>
#include "ath9k.h"
struct ath9k_vif_iter_data {
const u8 *hw_macaddr;
u8 mask[ETH_ALEN];
};
static void ath9k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
{
struct ath9k_vif_iter_data *iter_data = data;
int i;
for (i = 0; i < ETH_ALEN; i++)
iter_data->mask[i] &= ~(iter_data->hw_macaddr[i] ^ mac[i]);
}
void ath9k_set_bssid_mask(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
struct ath_wiphy *aphy = hw->priv;
struct ath_softc *sc = aphy->sc;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath9k_vif_iter_data iter_data;
int i;
/*
* Use the hardware MAC address as reference, the hardware uses it
* together with the BSSID mask when matching addresses.
*/
iter_data.hw_macaddr = common->macaddr;
memset(&iter_data.mask, 0xff, ETH_ALEN);
if (vif)
ath9k_vif_iter(&iter_data, vif->addr, vif);
/* Get list of all active MAC addresses */
spin_lock_bh(&sc->wiphy_lock);
ieee80211_iterate_active_interfaces_atomic(sc->hw, ath9k_vif_iter,
&iter_data);
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] == NULL)
continue;
ieee80211_iterate_active_interfaces_atomic(
sc->sec_wiphy[i]->hw, ath9k_vif_iter, &iter_data);
}
spin_unlock_bh(&sc->wiphy_lock);
memcpy(common->bssidmask, iter_data.mask, ETH_ALEN);
ath_hw_setbssidmask(common);
}
int ath9k_wiphy_add(struct ath_softc *sc)
{
int i, error;
struct ath_wiphy *aphy;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ieee80211_hw *hw;
u8 addr[ETH_ALEN];
hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy), &ath9k_ops);
if (hw == NULL)
return -ENOMEM;
spin_lock_bh(&sc->wiphy_lock);
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] == NULL)
break;
}
if (i == sc->num_sec_wiphy) {
/* No empty slot available; increase array length */
struct ath_wiphy **n;
n = krealloc(sc->sec_wiphy,
(sc->num_sec_wiphy + 1) *
sizeof(struct ath_wiphy *),
GFP_ATOMIC);
if (n == NULL) {
spin_unlock_bh(&sc->wiphy_lock);
ieee80211_free_hw(hw);
return -ENOMEM;
}
n[i] = NULL;
sc->sec_wiphy = n;
sc->num_sec_wiphy++;
}
SET_IEEE80211_DEV(hw, sc->dev);
aphy = hw->priv;
aphy->sc = sc;
aphy->hw = hw;
sc->sec_wiphy[i] = aphy;
spin_unlock_bh(&sc->wiphy_lock);
memcpy(addr, common->macaddr, ETH_ALEN);
addr[0] |= 0x02; /* Locally managed address */
/*
* XOR virtual wiphy index into the least significant bits to generate
* a different MAC address for each virtual wiphy.
*/
addr[5] ^= i & 0xff;
addr[4] ^= (i & 0xff00) >> 8;
addr[3] ^= (i & 0xff0000) >> 16;
SET_IEEE80211_PERM_ADDR(hw, addr);
ath9k_set_hw_capab(sc, hw);
error = ieee80211_register_hw(hw);
if (error == 0) {
/* Make sure wiphy scheduler is started (if enabled) */
ath9k_wiphy_set_scheduler(sc, sc->wiphy_scheduler_int);
}
return error;
}
int ath9k_wiphy_del(struct ath_wiphy *aphy)
{
struct ath_softc *sc = aphy->sc;
int i;
spin_lock_bh(&sc->wiphy_lock);
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (aphy == sc->sec_wiphy[i]) {
sc->sec_wiphy[i] = NULL;
spin_unlock_bh(&sc->wiphy_lock);
ieee80211_unregister_hw(aphy->hw);
ieee80211_free_hw(aphy->hw);
return 0;
}
}
spin_unlock_bh(&sc->wiphy_lock);
return -ENOENT;
}
static int ath9k_send_nullfunc(struct ath_wiphy *aphy,
struct ieee80211_vif *vif, const u8 *bssid,
int ps)
{
struct ath_softc *sc = aphy->sc;
struct ath_tx_control txctl;
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
__le16 fc;
struct ieee80211_tx_info *info;
skb = dev_alloc_skb(24);
if (skb == NULL)
return -ENOMEM;
hdr = (struct ieee80211_hdr *) skb_put(skb, 24);
memset(hdr, 0, 24);
fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
IEEE80211_FCTL_TODS);
if (ps)
fc |= cpu_to_le16(IEEE80211_FCTL_PM);
hdr->frame_control = fc;
memcpy(hdr->addr1, bssid, ETH_ALEN);
memcpy(hdr->addr2, aphy->hw->wiphy->perm_addr, ETH_ALEN);
memcpy(hdr->addr3, bssid, ETH_ALEN);
info = IEEE80211_SKB_CB(skb);
memset(info, 0, sizeof(*info));
info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS;
info->control.vif = vif;
info->control.rates[0].idx = 0;
info->control.rates[0].count = 4;
info->control.rates[1].idx = -1;
memset(&txctl, 0, sizeof(struct ath_tx_control));
txctl.txq = &sc->tx.txq[sc->tx.hwq_map[WME_AC_VO]];
txctl.frame_type = ps ? ATH9K_IFT_PAUSE : ATH9K_IFT_UNPAUSE;
if (ath_tx_start(aphy->hw, skb, &txctl) != 0)
goto exit;
return 0;
exit:
dev_kfree_skb_any(skb);
return -1;
}
static bool __ath9k_wiphy_pausing(struct ath_softc *sc)
{
int i;
if (sc->pri_wiphy->state == ATH_WIPHY_PAUSING)
return true;
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state == ATH_WIPHY_PAUSING)
return true;
}
return false;
}
static bool ath9k_wiphy_pausing(struct ath_softc *sc)
{
bool ret;
spin_lock_bh(&sc->wiphy_lock);
ret = __ath9k_wiphy_pausing(sc);
spin_unlock_bh(&sc->wiphy_lock);
return ret;
}
static bool __ath9k_wiphy_scanning(struct ath_softc *sc)
{
int i;
if (sc->pri_wiphy->state == ATH_WIPHY_SCAN)
return true;
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state == ATH_WIPHY_SCAN)
return true;
}
return false;
}
bool ath9k_wiphy_scanning(struct ath_softc *sc)
{
bool ret;
spin_lock_bh(&sc->wiphy_lock);
ret = __ath9k_wiphy_scanning(sc);
spin_unlock_bh(&sc->wiphy_lock);
return ret;
}
static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy);
/* caller must hold wiphy_lock */
static void __ath9k_wiphy_unpause_ch(struct ath_wiphy *aphy)
{
if (aphy == NULL)
return;
if (aphy->chan_idx != aphy->sc->chan_idx)
return; /* wiphy not on the selected channel */
__ath9k_wiphy_unpause(aphy);
}
static void ath9k_wiphy_unpause_channel(struct ath_softc *sc)
{
int i;
spin_lock_bh(&sc->wiphy_lock);
__ath9k_wiphy_unpause_ch(sc->pri_wiphy);
for (i = 0; i < sc->num_sec_wiphy; i++)
__ath9k_wiphy_unpause_ch(sc->sec_wiphy[i]);
spin_unlock_bh(&sc->wiphy_lock);
}
void ath9k_wiphy_chan_work(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc, chan_work);
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_wiphy *aphy = sc->next_wiphy;
if (aphy == NULL)
return;
/*
* All pending interfaces paused; ready to change
* channels.
*/
/* Change channels */
mutex_lock(&sc->mutex);
/* XXX: remove me eventually */
ath9k_update_ichannel(sc, aphy->hw,
&sc->sc_ah->channels[sc->chan_idx]);
/* sync hw configuration for hw code */
common->hw = aphy->hw;
ath_update_chainmask(sc, sc->chan_is_ht);
if (ath_set_channel(sc, aphy->hw,
&sc->sc_ah->channels[sc->chan_idx]) < 0) {
printk(KERN_DEBUG "ath9k: Failed to set channel for new "
"virtual wiphy\n");
mutex_unlock(&sc->mutex);
return;
}
mutex_unlock(&sc->mutex);
ath9k_wiphy_unpause_channel(sc);
}
/*
* ath9k version of ieee80211_tx_status() for TX frames that are generated
* internally in the driver.
*/
void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ath_wiphy *aphy = hw->priv;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
if ((tx_info->pad[0] & ATH_TX_INFO_FRAME_TYPE_PAUSE) &&
aphy->state == ATH_WIPHY_PAUSING) {
if (!(tx_info->flags & IEEE80211_TX_STAT_ACK)) {
printk(KERN_DEBUG "ath9k: %s: no ACK for pause "
"frame\n", wiphy_name(hw->wiphy));
/*
* The AP did not reply; ignore this to allow us to
* continue.
*/
}
aphy->state = ATH_WIPHY_PAUSED;
if (!ath9k_wiphy_pausing(aphy->sc)) {
/*
* Drop from tasklet to work to allow mutex for channel
* change.
*/
ieee80211_queue_work(aphy->sc->hw,
&aphy->sc->chan_work);
}
}
dev_kfree_skb(skb);
}
static void ath9k_mark_paused(struct ath_wiphy *aphy)
{
struct ath_softc *sc = aphy->sc;
aphy->state = ATH_WIPHY_PAUSED;
if (!__ath9k_wiphy_pausing(sc))
ieee80211_queue_work(sc->hw, &sc->chan_work);
}
static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
{
struct ath_wiphy *aphy = data;
struct ath_vif *avp = (void *) vif->drv_priv;
switch (vif->type) {
case NL80211_IFTYPE_STATION:
if (!vif->bss_conf.assoc) {
ath9k_mark_paused(aphy);
break;
}
/* TODO: could avoid this if already in PS mode */
if (ath9k_send_nullfunc(aphy, vif, avp->bssid, 1)) {
printk(KERN_DEBUG "%s: failed to send PS nullfunc\n",
__func__);
ath9k_mark_paused(aphy);
}
break;
case NL80211_IFTYPE_AP:
/* Beacon transmission is paused by aphy->state change */
ath9k_mark_paused(aphy);
break;
default:
break;
}
}
/* caller must hold wiphy_lock */
static int __ath9k_wiphy_pause(struct ath_wiphy *aphy)
{
ieee80211_stop_queues(aphy->hw);
aphy->state = ATH_WIPHY_PAUSING;
/*
* TODO: handle PAUSING->PAUSED for the case where there are multiple
* active vifs (now we do it on the first vif getting ready; should be
* on the last)
*/
ieee80211_iterate_active_interfaces_atomic(aphy->hw, ath9k_pause_iter,
aphy);
return 0;
}
int ath9k_wiphy_pause(struct ath_wiphy *aphy)
{
int ret;
spin_lock_bh(&aphy->sc->wiphy_lock);
ret = __ath9k_wiphy_pause(aphy);
spin_unlock_bh(&aphy->sc->wiphy_lock);
return ret;
}
static void ath9k_unpause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
{
struct ath_wiphy *aphy = data;
struct ath_vif *avp = (void *) vif->drv_priv;
switch (vif->type) {
case NL80211_IFTYPE_STATION:
if (!vif->bss_conf.assoc)
break;
ath9k_send_nullfunc(aphy, vif, avp->bssid, 0);
break;
case NL80211_IFTYPE_AP:
/* Beacon transmission is re-enabled by aphy->state change */
break;
default:
break;
}
}
/* caller must hold wiphy_lock */
static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy)
{
ieee80211_iterate_active_interfaces_atomic(aphy->hw,
ath9k_unpause_iter, aphy);
aphy->state = ATH_WIPHY_ACTIVE;
ieee80211_wake_queues(aphy->hw);
return 0;
}
int ath9k_wiphy_unpause(struct ath_wiphy *aphy)
{
int ret;
spin_lock_bh(&aphy->sc->wiphy_lock);
ret = __ath9k_wiphy_unpause(aphy);
spin_unlock_bh(&aphy->sc->wiphy_lock);
return ret;
}
static void __ath9k_wiphy_mark_all_paused(struct ath_softc *sc)
{
int i;
if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE)
sc->pri_wiphy->state = ATH_WIPHY_PAUSED;
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE)
sc->sec_wiphy[i]->state = ATH_WIPHY_PAUSED;
}
}
/* caller must hold wiphy_lock */
static void __ath9k_wiphy_pause_all(struct ath_softc *sc)
{
int i;
if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
__ath9k_wiphy_pause(sc->pri_wiphy);
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
__ath9k_wiphy_pause(sc->sec_wiphy[i]);
}
}
int ath9k_wiphy_select(struct ath_wiphy *aphy)
{
struct ath_softc *sc = aphy->sc;
bool now;
spin_lock_bh(&sc->wiphy_lock);
if (__ath9k_wiphy_scanning(sc)) {
/*
* For now, we are using mac80211 sw scan and it expects to
* have full control over channel changes, so avoid wiphy
* scheduling during a scan. This could be optimized if the
* scanning control were moved into the driver.
*/
spin_unlock_bh(&sc->wiphy_lock);
return -EBUSY;
}
if (__ath9k_wiphy_pausing(sc)) {
if (sc->wiphy_select_failures == 0)
sc->wiphy_select_first_fail = jiffies;
sc->wiphy_select_failures++;
if (time_after(jiffies, sc->wiphy_select_first_fail + HZ / 2))
{
printk(KERN_DEBUG "ath9k: Previous wiphy select timed "
"out; disable/enable hw to recover\n");
__ath9k_wiphy_mark_all_paused(sc);
/*
* TODO: this workaround to fix hardware is unlikely to
* be specific to virtual wiphy changes. It can happen
* on normal channel change, too, and as such, this
* should really be made more generic. For example,
* tricker radio disable/enable on GTT interrupt burst
* (say, 10 GTT interrupts received without any TX
* frame being completed)
*/
spin_unlock_bh(&sc->wiphy_lock);
ath_radio_disable(sc, aphy->hw);
ath_radio_enable(sc, aphy->hw);
/* Only the primary wiphy hw is used for queuing work */
ieee80211_queue_work(aphy->sc->hw,
&aphy->sc->chan_work);
return -EBUSY; /* previous select still in progress */
}
spin_unlock_bh(&sc->wiphy_lock);
return -EBUSY; /* previous select still in progress */
}
sc->wiphy_select_failures = 0;
/* Store the new channel */
sc->chan_idx = aphy->chan_idx;
sc->chan_is_ht = aphy->chan_is_ht;
sc->next_wiphy = aphy;
__ath9k_wiphy_pause_all(sc);
now = !__ath9k_wiphy_pausing(aphy->sc);
spin_unlock_bh(&sc->wiphy_lock);
if (now) {
/* Ready to request channel change immediately */
ieee80211_queue_work(aphy->sc->hw, &aphy->sc->chan_work);
}
/*
* wiphys will be unpaused in ath9k_tx_status() once channel has been
* changed if any wiphy needs time to become paused.
*/
return 0;
}
bool ath9k_wiphy_started(struct ath_softc *sc)
{
int i;
spin_lock_bh(&sc->wiphy_lock);
if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE) {
spin_unlock_bh(&sc->wiphy_lock);
return true;
}
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE) {
spin_unlock_bh(&sc->wiphy_lock);
return true;
}
}
spin_unlock_bh(&sc->wiphy_lock);
return false;
}
static void ath9k_wiphy_pause_chan(struct ath_wiphy *aphy,
struct ath_wiphy *selected)
{
if (selected->state == ATH_WIPHY_SCAN) {
if (aphy == selected)
return;
/*
* Pause all other wiphys for the duration of the scan even if
* they are on the current channel now.
*/
} else if (aphy->chan_idx == selected->chan_idx)
return;
aphy->state = ATH_WIPHY_PAUSED;
ieee80211_stop_queues(aphy->hw);
}
void ath9k_wiphy_pause_all_forced(struct ath_softc *sc,
struct ath_wiphy *selected)
{
int i;
spin_lock_bh(&sc->wiphy_lock);
if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
ath9k_wiphy_pause_chan(sc->pri_wiphy, selected);
for (i = 0; i < sc->num_sec_wiphy; i++) {
if (sc->sec_wiphy[i] &&
sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
ath9k_wiphy_pause_chan(sc->sec_wiphy[i], selected);
}
spin_unlock_bh(&sc->wiphy_lock);
}
void ath9k_wiphy_work(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc,
wiphy_work.work);
struct ath_wiphy *aphy = NULL;
bool first = true;
spin_lock_bh(&sc->wiphy_lock);
if (sc->wiphy_scheduler_int == 0) {
/* wiphy scheduler is disabled */
spin_unlock_bh(&sc->wiphy_lock);
return;
}
try_again:
sc->wiphy_scheduler_index++;
while (sc->wiphy_scheduler_index <= sc->num_sec_wiphy) {
aphy = sc->sec_wiphy[sc->wiphy_scheduler_index - 1];
if (aphy && aphy->state != ATH_WIPHY_INACTIVE)
break;
sc->wiphy_scheduler_index++;
aphy = NULL;
}
if (aphy == NULL) {
sc->wiphy_scheduler_index = 0;
if (sc->pri_wiphy->state == ATH_WIPHY_INACTIVE) {
if (first) {
first = false;
goto try_again;
}
/* No wiphy is ready to be scheduled */
} else
aphy = sc->pri_wiphy;
}
spin_unlock_bh(&sc->wiphy_lock);
if (aphy &&
aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN &&
ath9k_wiphy_select(aphy)) {
printk(KERN_DEBUG "ath9k: Failed to schedule virtual wiphy "
"change\n");
}
ieee80211_queue_delayed_work(sc->hw,
&sc->wiphy_work,
sc->wiphy_scheduler_int);
}
void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int)
{
cancel_delayed_work_sync(&sc->wiphy_work);
sc->wiphy_scheduler_int = msecs_to_jiffies(msec_int);
if (sc->wiphy_scheduler_int)
ieee80211_queue_delayed_work(sc->hw, &sc->wiphy_work,
sc->wiphy_scheduler_int);
}
/* caller must hold wiphy_lock */
bool ath9k_all_wiphys_idle(struct ath_softc *sc)
{
unsigned int i;
if (!sc->pri_wiphy->idle)
return false;
for (i = 0; i < sc->num_sec_wiphy; i++) {
struct ath_wiphy *aphy = sc->sec_wiphy[i];
if (!aphy)
continue;
if (!aphy->idle)
return false;
}
return true;
}
/* caller must hold wiphy_lock */
void ath9k_set_wiphy_idle(struct ath_wiphy *aphy, bool idle)
{
struct ath_softc *sc = aphy->sc;
aphy->idle = idle;
ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
"Marking %s as %s\n",
wiphy_name(aphy->hw->wiphy),
idle ? "idle" : "not-idle");
}
/* Only bother starting a queue on an active virtual wiphy */
bool ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue)
{
struct ieee80211_hw *hw = sc->pri_wiphy->hw;
unsigned int i;
bool txq_started = false;
spin_lock_bh(&sc->wiphy_lock);
/* Start the primary wiphy */
if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE) {
ieee80211_wake_queue(hw, skb_queue);
txq_started = true;
goto unlock;
}
/* Now start the secondary wiphy queues */
for (i = 0; i < sc->num_sec_wiphy; i++) {
struct ath_wiphy *aphy = sc->sec_wiphy[i];
if (!aphy)
continue;
if (aphy->state != ATH_WIPHY_ACTIVE)
continue;
hw = aphy->hw;
ieee80211_wake_queue(hw, skb_queue);
txq_started = true;
break;
}
unlock:
spin_unlock_bh(&sc->wiphy_lock);
return txq_started;
}
/* Go ahead and propagate information to all virtual wiphys, it won't hurt */
void ath_mac80211_stop_queue(struct ath_softc *sc, u16 skb_queue)
{
struct ieee80211_hw *hw = sc->pri_wiphy->hw;
unsigned int i;
spin_lock_bh(&sc->wiphy_lock);
/* Stop the primary wiphy */
ieee80211_stop_queue(hw, skb_queue);
/* Now stop the secondary wiphy queues */
for (i = 0; i < sc->num_sec_wiphy; i++) {
struct ath_wiphy *aphy = sc->sec_wiphy[i];
if (!aphy)
continue;
hw = aphy->hw;
ieee80211_stop_queue(hw, skb_queue);
}
spin_unlock_bh(&sc->wiphy_lock);
}
