mac80211: move TX status handling

It's enough code to have its own file, I think.
Especially since I'm going to add to it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 0 insertions, 336 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index f4be97c..e843a91 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -9,7 +9,6 @@
  */
 
 #include <net/mac80211.h>
-#include <net/ieee80211_radiotap.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
@@ -30,26 +29,11 @@
 #include "rate.h"
 #include "mesh.h"
 #include "wep.h"
-#include "wme.h"
-#include "aes_ccm.h"
 #include "led.h"
 #include "cfg.h"
 #include "debugfs.h"
 #include "debugfs_netdev.h"
 
-/*
- * For seeing transmitted packets on monitor interfaces
- * we have a radiotap header too.
- */
-struct ieee80211_tx_status_rtap_hdr {
-	struct ieee80211_radiotap_header hdr;
-	u8 rate;
-	u8 padding_for_rate;
-	__le16 tx_flags;
-	u8 data_retries;
-} __attribute__ ((packed));
-
-
 void ieee80211_configure_filter(struct ieee80211_local *local)
 {
 	u64 mc;
@@ -253,28 +237,6 @@ u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 	       BSS_CHANGED_ERP_SLOT;
 }
 
-void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
-				 struct sk_buff *skb)
-{
-	struct ieee80211_local *local = hw_to_local(hw);
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	int tmp;
-
-	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
-	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
-		       &local->skb_queue : &local->skb_queue_unreliable, skb);
-	tmp = skb_queue_len(&local->skb_queue) +
-		skb_queue_len(&local->skb_queue_unreliable);
-	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
-	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
-		dev_kfree_skb_irq(skb);
-		tmp--;
-		I802_DEBUG_INC(local->tx_status_drop);
-	}
-	tasklet_schedule(&local->tasklet);
-}
-EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
-
 static void ieee80211_tasklet_handler(unsigned long data)
 {
 	struct ieee80211_local *local = (struct ieee80211_local *) data;
@@ -315,304 +277,6 @@ static void ieee80211_tasklet_handler(unsigned long data)
 	}
 }
 
-static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
-					    struct sta_info *sta,
-					    struct sk_buff *skb)
-{
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-
-	/*
-	 * XXX: This is temporary!
-	 *
-	 *	The problem here is that when we get here, the driver will
-	 *	quite likely have pretty much overwritten info->control by
-	 *	using info->driver_data or info->rate_driver_data. Thus,
-	 *	when passing out the frame to the driver again, we would be
-	 *	passing completely bogus data since the driver would then
-	 *	expect a properly filled info->control. In mac80211 itself
-	 *	the same problem occurs, since we need info->control.vif
-	 *	internally.
-	 *
-	 *	To fix this, we should send the frame through TX processing
-	 *	again. However, it's not that simple, since the frame will
-	 *	have been software-encrypted (if applicable) already, and
-	 *	encrypting it again doesn't do much good. So to properly do
-	 *	that, we not only have to skip the actual 'raw' encryption
-	 *	(key selection etc. still has to be done!) but also the
-	 *	sequence number assignment since that impacts the crypto
-	 *	encapsulation, of course.
-	 *
-	 *	Hence, for now, fix the bug by just dropping the frame.
-	 */
-	goto drop;
-
-	sta->tx_filtered_count++;
-
-	/*
-	 * Clear the TX filter mask for this STA when sending the next
-	 * packet. If the STA went to power save mode, this will happen
-	 * when it wakes up for the next time.
-	 */
-	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
-
-	/*
-	 * This code races in the following way:
-	 *
-	 *  (1) STA sends frame indicating it will go to sleep and does so
-	 *  (2) hardware/firmware adds STA to filter list, passes frame up
-	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
-	 *  (4) we get TX status before having processed the frame and
-	 *	knowing that the STA has gone to sleep.
-	 *
-	 * This is actually quite unlikely even when both those events are
-	 * processed from interrupts coming in quickly after one another or
-	 * even at the same time because we queue both TX status events and
-	 * RX frames to be processed by a tasklet and process them in the
-	 * same order that they were received or TX status last. Hence, there
-	 * is no race as long as the frame RX is processed before the next TX
-	 * status, which drivers can ensure, see below.
-	 *
-	 * Note that this can only happen if the hardware or firmware can
-	 * actually add STAs to the filter list, if this is done by the
-	 * driver in response to set_tim() (which will only reduce the race
-	 * this whole filtering tries to solve, not completely solve it)
-	 * this situation cannot happen.
-	 *
-	 * To completely solve this race drivers need to make sure that they
-	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
-	 *	functions and
-	 *  (b) always process RX events before TX status events if ordering
-	 *      can be unknown, for example with different interrupt status
-	 *	bits.
-	 */
-	if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
-	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
-		skb_queue_tail(&sta->tx_filtered, skb);
-		return;
-	}
-
-	if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
-	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
-		/* Software retry the packet once */
-		info->flags |= IEEE80211_TX_INTFL_RETRIED;
-		ieee80211_add_pending_skb(local, skb);
-		return;
-	}
-
- drop:
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	if (net_ratelimit())
-		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
-		       "queue_len=%d PS=%d @%lu\n",
-		       wiphy_name(local->hw.wiphy),
-		       skb_queue_len(&sta->tx_filtered),
-		       !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
-#endif
-	dev_kfree_skb(skb);
-}
-
-void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
-{
-	struct sk_buff *skb2;
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-	struct ieee80211_local *local = hw_to_local(hw);
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	u16 frag, type;
-	__le16 fc;
-	struct ieee80211_supported_band *sband;
-	struct ieee80211_tx_status_rtap_hdr *rthdr;
-	struct ieee80211_sub_if_data *sdata;
-	struct net_device *prev_dev = NULL;
-	struct sta_info *sta;
-	int retry_count = -1, i;
-
-	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
-		/* the HW cannot have attempted that rate */
-		if (i >= hw->max_rates) {
-			info->status.rates[i].idx = -1;
-			info->status.rates[i].count = 0;
-		}
-
-		retry_count += info->status.rates[i].count;
-	}
-	if (retry_count < 0)
-		retry_count = 0;
-
-	rcu_read_lock();
-
-	sband = local->hw.wiphy->bands[info->band];
-
-	sta = sta_info_get(local, hdr->addr1);
-
-	if (sta) {
-		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
-		    test_sta_flags(sta, WLAN_STA_PS_STA)) {
-			/*
-			 * The STA is in power save mode, so assume
-			 * that this TX packet failed because of that.
-			 */
-			ieee80211_handle_filtered_frame(local, sta, skb);
-			rcu_read_unlock();
-			return;
-		}
-
-		fc = hdr->frame_control;
-
-		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
-		    (ieee80211_is_data_qos(fc))) {
-			u16 tid, ssn;
-			u8 *qc;
-
-			qc = ieee80211_get_qos_ctl(hdr);
-			tid = qc[0] & 0xf;
-			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
-						& IEEE80211_SCTL_SEQ);
-			ieee80211_send_bar(sta->sdata, hdr->addr1,
-					   tid, ssn);
-		}
-
-		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
-			ieee80211_handle_filtered_frame(local, sta, skb);
-			rcu_read_unlock();
-			return;
-		} else {
-			if (!(info->flags & IEEE80211_TX_STAT_ACK))
-				sta->tx_retry_failed++;
-			sta->tx_retry_count += retry_count;
-		}
-
-		rate_control_tx_status(local, sband, sta, skb);
-		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
-			ieee80211s_update_metric(local, sta, skb);
-	}
-
-	rcu_read_unlock();
-
-	ieee80211_led_tx(local, 0);
-
-	/* SNMP counters
-	 * Fragments are passed to low-level drivers as separate skbs, so these
-	 * are actually fragments, not frames. Update frame counters only for
-	 * the first fragment of the frame. */
-
-	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
-	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
-
-	if (info->flags & IEEE80211_TX_STAT_ACK) {
-		if (frag == 0) {
-			local->dot11TransmittedFrameCount++;
-			if (is_multicast_ether_addr(hdr->addr1))
-				local->dot11MulticastTransmittedFrameCount++;
-			if (retry_count > 0)
-				local->dot11RetryCount++;
-			if (retry_count > 1)
-				local->dot11MultipleRetryCount++;
-		}
-
-		/* This counter shall be incremented for an acknowledged MPDU
-		 * with an individual address in the address 1 field or an MPDU
-		 * with a multicast address in the address 1 field of type Data
-		 * or Management. */
-		if (!is_multicast_ether_addr(hdr->addr1) ||
-		    type == IEEE80211_FTYPE_DATA ||
-		    type == IEEE80211_FTYPE_MGMT)
-			local->dot11TransmittedFragmentCount++;
-	} else {
-		if (frag == 0)
-			local->dot11FailedCount++;
-	}
-
-	/* this was a transmitted frame, but now we want to reuse it */
-	skb_orphan(skb);
-
-	/*
-	 * This is a bit racy but we can avoid a lot of work
-	 * with this test...
-	 */
-	if (!local->monitors && !local->cooked_mntrs) {
-		dev_kfree_skb(skb);
-		return;
-	}
-
-	/* send frame to monitor interfaces now */
-
-	if (skb_headroom(skb) < sizeof(*rthdr)) {
-		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
-		dev_kfree_skb(skb);
-		return;
-	}
-
-	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
-				skb_push(skb, sizeof(*rthdr));
-
-	memset(rthdr, 0, sizeof(*rthdr));
-	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
-	rthdr->hdr.it_present =
-		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
-			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
-			    (1 << IEEE80211_RADIOTAP_RATE));
-
-	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
-	    !is_multicast_ether_addr(hdr->addr1))
-		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
-
-	/*
-	 * XXX: Once radiotap gets the bitmap reset thing the vendor
-	 *	extensions proposal contains, we can actually report
-	 *	the whole set of tries we did.
-	 */
-	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
-	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
-		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
-	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
-		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
-	if (info->status.rates[0].idx >= 0 &&
-	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
-		rthdr->rate = sband->bitrates[
-				info->status.rates[0].idx].bitrate / 5;
-
-	/* for now report the total retry_count */
-	rthdr->data_retries = retry_count;
-
-	/* XXX: is this sufficient for BPF? */
-	skb_set_mac_header(skb, 0);
-	skb->ip_summed = CHECKSUM_UNNECESSARY;
-	skb->pkt_type = PACKET_OTHERHOST;
-	skb->protocol = htons(ETH_P_802_2);
-	memset(skb->cb, 0, sizeof(skb->cb));
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
-			if (!netif_running(sdata->dev))
-				continue;
-
-			if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
-			    !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
-			    (type == IEEE80211_FTYPE_DATA))
-				continue;
-
-			if (prev_dev) {
-				skb2 = skb_clone(skb, GFP_ATOMIC);
-				if (skb2) {
-					skb2->dev = prev_dev;
-					netif_rx(skb2);
-				}
-			}
-
-			prev_dev = sdata->dev;
-		}
-	}
-	if (prev_dev) {
-		skb->dev = prev_dev;
-		netif_rx(skb);
-		skb = NULL;
-	}
-	rcu_read_unlock();
-	dev_kfree_skb(skb);
-}
-EXPORT_SYMBOL(ieee80211_tx_status);
-
 static void ieee80211_restart_work(struct work_struct *work)
 {
 	struct ieee80211_local *local =