Commit 5f16a436 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: support direct offchannel TX offload 



For devices supported by iwlwifi sometimes
off-channel transmissions need to be handled
by the device completely. To support this
mac80211 needs to pass the frame directly
to the driver and not through the TX path
as the driver needs the frame and channel
information at the same time.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 8628172f

include/net/mac80211.h

+10 −0
Original line number Diff line number Diff line
@@ -1799,6 +1799,11 @@ enum ieee80211_ampdu_mlme_action { 
 *	ieee80211_remain_on_channel_expired(). This callback may sleep.

 * @cancel_remain_on_channel: Requests that an ongoing off-channel period is

 *	aborted before it expires. This callback may sleep.

 * @offchannel_tx: Transmit frame on another channel, wait for a response

 *	and return. Reliable TX status must be reported for the frame. If the

 *	return value is 1, then the @remain_on_channel will be used with a

 *	regular transmission (if supported.)

 * @offchannel_tx_cancel_wait: cancel wait associated with offchannel TX

 */

struct ieee80211_ops {

	void (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -1878,6 +1883,11 @@ struct ieee80211_ops { 
				 enum nl80211_channel_type channel_type,

				 int duration);

	int (*cancel_remain_on_channel)(struct ieee80211_hw *hw);

	int (*offchannel_tx)(struct ieee80211_hw *hw, struct sk_buff *skb,

			     struct ieee80211_channel *chan,

			     enum nl80211_channel_type channel_type,

			     unsigned int wait);

	int (*offchannel_tx_cancel_wait)(struct ieee80211_hw *hw);

};



/**

net/mac80211/cfg.c

+39 −0
Original line number Diff line number Diff line
@@ -1800,6 +1800,33 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev, 


	*cookie = (unsigned long) skb;



	if (is_offchan && local->ops->offchannel_tx) {

		int ret;



		IEEE80211_SKB_CB(skb)->band = chan->band;



		mutex_lock(&local->mtx);



		if (local->hw_offchan_tx_cookie) {

			mutex_unlock(&local->mtx);

			return -EBUSY;

		}



		/* TODO: bitrate control, TX processing? */

		ret = drv_offchannel_tx(local, skb, chan, channel_type, wait);



		if (ret == 0)

			local->hw_offchan_tx_cookie = *cookie;

		mutex_unlock(&local->mtx);



		/*

		 * Allow driver to return 1 to indicate it wants to have the

		 * frame transmitted with a remain_on_channel + regular TX.

		 */

		if (ret != 1)

			return ret;

	}



	if (is_offchan && local->ops->remain_on_channel) {

		unsigned int duration;

		int ret;
@@ -1886,6 +1913,18 @@ static int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy, 


	mutex_lock(&local->mtx);



	if (local->ops->offchannel_tx_cancel_wait &&

	    local->hw_offchan_tx_cookie == cookie) {

		ret = drv_offchannel_tx_cancel_wait(local);



		if (!ret)

			local->hw_offchan_tx_cookie = 0;



		mutex_unlock(&local->mtx);



		return ret;

	}



	if (local->ops->cancel_remain_on_channel) {

		cookie ^= 2;

		ret = ieee80211_cancel_remain_on_channel_hw(local, cookie);

net/mac80211/driver-ops.h

+31 −0
Original line number Diff line number Diff line
@@ -495,4 +495,35 @@ static inline int drv_cancel_remain_on_channel(struct ieee80211_local *local) 
	return ret;

}



static inline int drv_offchannel_tx(struct ieee80211_local *local,

				    struct sk_buff *skb,

				    struct ieee80211_channel *chan,

				    enum nl80211_channel_type channel_type,

				    unsigned int wait)

{

	int ret;



	might_sleep();



	trace_drv_offchannel_tx(local, skb, chan, channel_type, wait);

	ret = local->ops->offchannel_tx(&local->hw, skb, chan,

					channel_type, wait);

	trace_drv_return_int(local, ret);



	return ret;

}



static inline int drv_offchannel_tx_cancel_wait(struct ieee80211_local *local)

{

	int ret;



	might_sleep();



	trace_drv_offchannel_tx_cancel_wait(local);

	ret = local->ops->offchannel_tx_cancel_wait(&local->hw);

	trace_drv_return_int(local, ret);



	return ret;

}



#endif /* __MAC80211_DRIVER_OPS */

net/mac80211/driver-trace.h

+33 −0
Original line number Diff line number Diff line
@@ -884,6 +884,39 @@ DEFINE_EVENT(local_only_evt, drv_cancel_remain_on_channel, 
	TP_ARGS(local)

);



TRACE_EVENT(drv_offchannel_tx,

	TP_PROTO(struct ieee80211_local *local, struct sk_buff *skb,

		 struct ieee80211_channel *chan,

		 enum nl80211_channel_type channel_type,

		 unsigned int wait),



	TP_ARGS(local, skb, chan, channel_type, wait),



	TP_STRUCT__entry(

		LOCAL_ENTRY

		__field(int, center_freq)

		__field(int, channel_type)

		__field(unsigned int, wait)

	),



	TP_fast_assign(

		LOCAL_ASSIGN;

		__entry->center_freq = chan->center_freq;

		__entry->channel_type = channel_type;

		__entry->wait = wait;

	),



	TP_printk(

		LOCAL_PR_FMT " freq:%dMHz, wait:%dms",

		LOCAL_PR_ARG, __entry->center_freq, __entry->wait

	)

);



DEFINE_EVENT(local_only_evt, drv_offchannel_tx_cancel_wait,

	TP_PROTO(struct ieee80211_local *local),

	TP_ARGS(local)

);



/*

 * Tracing for API calls that drivers call.

 */

net/mac80211/ieee80211_i.h

+1 −0
Original line number Diff line number Diff line
@@ -957,6 +957,7 @@ struct ieee80211_local { 
	unsigned int hw_roc_duration;

	u32 hw_roc_cookie;

	bool hw_roc_for_tx;

	unsigned long hw_offchan_tx_cookie;



	/* dummy netdev for use w/ NAPI */

	struct net_device napi_dev;

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