Commit a26eb27a authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
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mac80211: move fragment flag to info flag as dont-fragment 



The purpose of this is two-fold:
 1) by moving it out of tx_data.flags, we can in
    another patch move the radiotap parsing so it
    no longer is in the hotpath
 2) if a device implements fragmentation but can
    optionally skip it, the radiotap request for
    not doing fragmentation may be honoured

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 68f2b517

include/net/mac80211.h

+4 −0
Original line number Diff line number Diff line
@@ -375,6 +375,9 @@ struct ieee80211_bss_conf { 
 * @IEEE80211_TX_CTL_USE_MINRATE: This frame will be sent at lowest rate.

 *	This flag is used to send nullfunc frame at minimum rate when

 *	the nullfunc is used for connection monitoring purpose.

 * @IEEE80211_TX_CTL_DONTFRAG: Don't fragment this packet even if it

 *	would be fragmented by size (this is optional, only used for

 *	monitor injection).

 *

 * Note: If you have to add new flags to the enumeration, then don't

 *	 forget to update %IEEE80211_TX_TEMPORARY_FLAGS when necessary.
@@ -408,6 +411,7 @@ enum mac80211_tx_control_flags { 
	IEEE80211_TX_CTL_NO_CCK_RATE		= BIT(27),

	IEEE80211_TX_STATUS_EOSP		= BIT(28),

	IEEE80211_TX_CTL_USE_MINRATE		= BIT(29),

	IEEE80211_TX_CTL_DONTFRAG		= BIT(30),

};



#define IEEE80211_TX_CTL_STBC_SHIFT		23

net/mac80211/ieee80211_i.h

+0 −1
Original line number Diff line number Diff line
@@ -136,7 +136,6 @@ typedef unsigned __bitwise__ ieee80211_tx_result; 
#define TX_DROP		((__force ieee80211_tx_result) 1u)

#define TX_QUEUED	((__force ieee80211_tx_result) 2u)



#define IEEE80211_TX_FRAGMENTED		BIT(0)

#define IEEE80211_TX_UNICAST		BIT(1)

#define IEEE80211_TX_PS_BUFFERED	BIT(2)

net/mac80211/tx.c

+14 −25
Original line number Diff line number Diff line
@@ -898,7 +898,10 @@ ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 
	int hdrlen;

	int fragnum;



	if (!(tx->flags & IEEE80211_TX_FRAGMENTED))

	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)

		return TX_CONTINUE;



	if (tx->local->ops->set_frag_threshold)

		return TX_CONTINUE;



	/*
@@ -911,7 +914,7 @@ ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 


	hdrlen = ieee80211_hdrlen(hdr->frame_control);



	/* internal error, why is TX_FRAGMENTED set? */

	/* internal error, why isn't DONTFRAG set? */

	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))

		return TX_DROP;
@@ -1050,17 +1053,13 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, 
	struct ieee80211_radiotap_iterator iterator;

	struct ieee80211_radiotap_header *rthdr =

		(struct ieee80211_radiotap_header *) skb->data;

	bool hw_frag;

	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,

						   NULL);

	u16 txflags;



	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

	tx->flags &= ~IEEE80211_TX_FRAGMENTED;



	/* packet is fragmented in HW if we have a non-NULL driver callback */

	hw_frag = (tx->local->ops->set_frag_threshold != NULL);

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |

		       IEEE80211_TX_CTL_DONTFRAG;



	/*

	 * for every radiotap entry that is present
@@ -1098,9 +1097,8 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, 
			}

			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)

				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;

			if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&

								!hw_frag)

				tx->flags |= IEEE80211_TX_FRAGMENTED;

			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)

				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;

			break;



		case IEEE80211_RADIOTAP_TX_FLAGS:
@@ -1206,13 +1204,6 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 
	tx->local = local;

	tx->sdata = sdata;

	tx->channel = local->hw.conf.channel;

	/*

	 * Set this flag (used below to indicate "automatic fragmentation"),

	 * it will be cleared/left by radiotap as desired.

	 * Only valid when fragmentation is done by the stack.

	 */

	if (!local->ops->set_frag_threshold)

		tx->flags |= IEEE80211_TX_FRAGMENTED;



	/* process and remove the injection radiotap header */

	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
@@ -1281,13 +1272,11 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 
		 */

	}



	if (tx->flags & IEEE80211_TX_FRAGMENTED) {

		if ((tx->flags & IEEE80211_TX_UNICAST) &&

		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&

		    !(info->flags & IEEE80211_TX_CTL_AMPDU))

			tx->flags |= IEEE80211_TX_FRAGMENTED;

		else

			tx->flags &= ~IEEE80211_TX_FRAGMENTED;

	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {

		if (!(tx->flags & IEEE80211_TX_UNICAST) ||

		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||

		    info->flags & IEEE80211_TX_CTL_AMPDU)

			info->flags |= IEEE80211_TX_CTL_DONTFRAG;

	}



	if (!tx->sta)

net/mac80211/wpa.c

+2 −1
Original line number Diff line number Diff line
@@ -53,7 +53,8 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) 
	}



	if (info->control.hw_key &&

	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&

	    (info->flags & IEEE80211_TX_CTL_DONTFRAG ||

	     tx->local->ops->set_frag_threshold) &&

	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {

		/* hwaccel - with no need for SW-generated MMIC */

		return TX_CONTINUE;

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