Commit 37fbd908 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville

mac80211: allow out-of-band EOSP notification

iwlwifi has a separate EOSP notification from
the device, and to make use of that properly
it needs to be passed to mac80211. To be able
to mix with tx_status_irqsafe and rx_irqsafe
it also needs to be an "_irqsafe" version in
the sense that it goes through the tasklet,
the actual flag clearing would be IRQ-safe
but doing it directly would cause reordering
issues.

This is needed in the case of a P2P GO going
into an absence period without transmitting
any frames that should be driver-released as
in this case there's no other way to inform
mac80211 that the service period ended. Note
that for drivers that don't use the _irqsafe
functions another version of this function
will be required.
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 40b96408
......@@ -1971,7 +1971,8 @@ enum ieee80211_frame_release_type {
* at least one, however). In this case it is also responsible for
* setting the EOSP flag in the QoS header of the frames. Also, when the
* service period ends, the driver must set %IEEE80211_TX_STATUS_EOSP
* on the last frame in the SP.
* on the last frame in the SP. Alternatively, it may call the function
* ieee80211_sta_eosp_irqsafe() to inform mac80211 of the end of the SP.
* This callback must be atomic.
* @allow_buffered_frames: Prepare device to allow the given number of frames
* to go out to the given station. The frames will be sent by mac80211
......@@ -1981,7 +1982,8 @@ enum ieee80211_frame_release_type {
* frames from multiple TIDs are released and the driver might reorder
* them between the TIDs, it must set the %IEEE80211_TX_STATUS_EOSP flag
* on the last frame and clear it on all others and also handle the EOSP
* bit in the QoS header correctly.
* bit in the QoS header correctly. Alternatively, it can also call the
* ieee80211_sta_eosp_irqsafe() function.
* The @tids parameter is a bitmap and tells the driver which TIDs the
* frames will be on; it will at most have two bits set.
* This callback must be atomic.
......@@ -3112,6 +3114,24 @@ struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
struct ieee80211_sta *pubsta, bool block);
/**
* ieee80211_sta_eosp - notify mac80211 about end of SP
* @pubsta: the station
*
* When a device transmits frames in a way that it can't tell
* mac80211 in the TX status about the EOSP, it must clear the
* %IEEE80211_TX_STATUS_EOSP bit and call this function instead.
* This applies for PS-Poll as well as uAPSD.
*
* Note that there is no non-_irqsafe version right now as
* it wasn't needed, but just like _tx_status() and _rx()
* must not be mixed in irqsafe/non-irqsafe versions, this
* function must not be mixed with those either. Use the
* all irqsafe, or all non-irqsafe, don't mix! If you need
* the non-irqsafe version of this, you need to add it.
*/
void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta);
/**
* ieee80211_iter_keys - iterate keys programmed into the device
* @hw: pointer obtained from ieee80211_alloc_hw()
......
......@@ -1498,6 +1498,28 @@ TRACE_EVENT(api_enable_rssi_reports,
)
);
TRACE_EVENT(api_eosp,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sta *sta),
TP_ARGS(local, sta),
TP_STRUCT__entry(
LOCAL_ENTRY
STA_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
STA_ASSIGN;
),
TP_printk(
LOCAL_PR_FMT STA_PR_FMT,
LOCAL_PR_ARG, STA_PR_FMT
)
);
/*
* Tracing for internal functions
* (which may also be called in response to driver calls)
......
......@@ -664,6 +664,11 @@ enum sdata_queue_type {
enum {
IEEE80211_RX_MSG = 1,
IEEE80211_TX_STATUS_MSG = 2,
IEEE80211_EOSP_MSG = 3,
};
struct skb_eosp_msg_data {
u8 sta[ETH_ALEN], iface[ETH_ALEN];
};
enum queue_stop_reason {
......
......@@ -325,6 +325,8 @@ u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
static void ieee80211_tasklet_handler(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sta_info *sta, *tmp;
struct skb_eosp_msg_data *eosp_data;
struct sk_buff *skb;
while ((skb = skb_dequeue(&local->skb_queue)) ||
......@@ -340,6 +342,18 @@ static void ieee80211_tasklet_handler(unsigned long data)
skb->pkt_type = 0;
ieee80211_tx_status(local_to_hw(local), skb);
break;
case IEEE80211_EOSP_MSG:
eosp_data = (void *)skb->cb;
for_each_sta_info(local, eosp_data->sta, sta, tmp) {
/* skip wrong virtual interface */
if (memcmp(eosp_data->iface,
sta->sdata->vif.addr, ETH_ALEN))
continue;
clear_sta_flag(sta, WLAN_STA_SP);
break;
}
dev_kfree_skb(skb);
break;
default:
WARN(1, "mac80211: Packet is of unknown type %d\n",
skb->pkt_type);
......
......@@ -1478,6 +1478,31 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL(ieee80211_sta_block_awake);
void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
struct ieee80211_local *local = sta->local;
struct sk_buff *skb;
struct skb_eosp_msg_data *data;
trace_api_eosp(local, pubsta);
skb = alloc_skb(0, GFP_ATOMIC);
if (!skb) {
/* too bad ... but race is better than loss */
clear_sta_flag(sta, WLAN_STA_SP);
return;
}
data = (void *)skb->cb;
memcpy(data->sta, pubsta->addr, ETH_ALEN);
memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
skb->pkt_type = IEEE80211_EOSP_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
u8 tid, bool buffered)
{
......
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