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Commit 06be6b14 authored by Felix Fietkau's avatar Felix Fietkau Committed by Johannes Berg
Browse files

mac80211: add ieee80211_tx_prepare_skb() helper function 



This can be used by a driver to prepare skbs for transmission, which were
obtained via functions such as ieee80211_probereq_get or
ieee80211_nullfunc_get.

This is useful for drivers that want to send those frames directly, but
need rate control information to be prepared first.

Signed-off-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 034c6d6e

include/net/mac80211.h

+14 −0
Original line number Diff line number Diff line
@@ -4571,4 +4571,18 @@ void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif, 
				    struct cfg80211_wowlan_wakeup *wakeup,

				    gfp_t gfp);



/**

 * ieee80211_tx_prepare_skb - prepare an 802.11 skb for transmission

 * @hw: pointer as obtained from ieee80211_alloc_hw()

 * @vif: virtual interface

 * @skb: frame to be sent from within the driver

 * @band: the band to transmit on

 * @sta: optional pointer to get the station to send the frame to

 *

 * Note: must be called under RCU lock

 */

bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,

			      struct ieee80211_vif *vif, struct sk_buff *skb,

			      int band, struct ieee80211_sta **sta);



#endif /* MAC80211_H */

net/mac80211/tx.c

+29 −0
Original line number Diff line number Diff line
@@ -1366,6 +1366,35 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 
	return 0;

}



bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,

			      struct ieee80211_vif *vif, struct sk_buff *skb,

			      int band, struct ieee80211_sta **sta)

{

	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	struct ieee80211_tx_data tx;



	if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)

		return false;



	info->band = band;

	info->control.vif = vif;

	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];



	if (invoke_tx_handlers(&tx))

		return false;



	if (sta) {

		if (tx.sta)

			*sta = &tx.sta->sta;

		else

			*sta = NULL;

	}



	return true;

}

EXPORT_SYMBOL(ieee80211_tx_prepare_skb);



/*

 * Returns false if the frame couldn't be transmitted but was queued instead.

 */