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mac80211: allow out-of-band EOSP notification

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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: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2011-09-29 16:04:39 +02:00
committed by John W. Linville
parent 40b9640883
commit 37fbd90800
5 changed files with 88 additions and 2 deletions
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24
include/net/mac80211.h
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@@ -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()