openwrt/package/madwifi/patches/416-wprobe.patch

--- /dev/null
+++ b/ath/ath_wprobe.c
@@ -0,0 +1,433 @@
+#include <net80211/ieee80211_node.h>
+#include <linux/wprobe.h>
+
+atomic_t cleanup_tasks = ATOMIC_INIT(0);
+
+enum wp_node_val {
+	WP_NODE_RSSI,
+	WP_NODE_SIGNAL,
+	WP_NODE_RX_RATE,
+	WP_NODE_TX_RATE,
+	WP_NODE_RETRANSMIT_200,
+	WP_NODE_RETRANSMIT_400,
+	WP_NODE_RETRANSMIT_800,
+	WP_NODE_RETRANSMIT_1600,
+};
+
+enum wp_global_val {
+	WP_GLOBAL_NOISE,
+	WP_GLOBAL_PHY_BUSY,
+	WP_GLOBAL_PHY_RX,
+	WP_GLOBAL_PHY_TX,
+	WP_GLOBAL_FRAMES,
+	WP_GLOBAL_PROBEREQ,
+};
+
+static struct wprobe_item ath_wprobe_globals[] = {
+	[WP_GLOBAL_NOISE] = {
+		.name = "noise",
+		.type = WPROBE_VAL_S16,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_GLOBAL_PHY_BUSY] = {
+		.name = "phy_busy",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_GLOBAL_PHY_RX] = {
+		.name = "phy_rx",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_GLOBAL_PHY_TX] = {
+		.name = "phy_tx",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_GLOBAL_FRAMES] = {
+		.name = "frames",
+		.type = WPROBE_VAL_U32,
+	},
+	[WP_GLOBAL_PROBEREQ] = {
+		.name = "probereq",
+		.type = WPROBE_VAL_U32,
+	},
+};
+
+static struct wprobe_item ath_wprobe_link[] = {
+	[WP_NODE_RSSI] = {
+		.name = "rssi",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_SIGNAL] = {
+		.name = "signal",
+		.type = WPROBE_VAL_S16,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_RX_RATE] = {
+		.name = "rx_rate",
+		.type = WPROBE_VAL_U16,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_TX_RATE] = {
+		.name = "tx_rate",
+		.type = WPROBE_VAL_U16,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_RETRANSMIT_200] = {
+		.name = "retransmit_200",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_RETRANSMIT_400] = {
+		.name = "retransmit_400",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_RETRANSMIT_800] = {
+		.name = "retransmit_800",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+	[WP_NODE_RETRANSMIT_1600] = {
+		.name = "retransmit_1600",
+		.type = WPROBE_VAL_U8,
+		.flags = WPROBE_F_KEEPSTAT
+	},
+};
+
+#define AR5K_MIBC       0x0040
+#define AR5K_MIBC_FREEZE	(1 << 1)
+#define AR5K_TXFC       0x80ec
+#define AR5K_RXFC       0x80f0
+#define AR5K_RXCLEAR    0x80f4
+#define AR5K_CYCLES     0x80f8
+
+#define READ_CLR(_ah, _reg) \
+	({ u32 __val = OS_REG_READ(_ah, _reg); OS_REG_WRITE(_ah, _reg, 0); __val; })
+
+static bool
+wprobe_disabled(void)
+{
+	return (!wprobe_add_iface || IS_ERR(wprobe_add_iface));
+}
+
+static int
+ath_wprobe_sync(struct wprobe_iface *dev, struct wprobe_link *l, struct wprobe_value *val, bool measure)
+{
+	struct ath_vap *avp = container_of(dev, struct ath_vap, av_wpif);
+	struct ieee80211vap *vap = &avp->av_vap;
+	struct ieee80211com *ic = vap->iv_ic;
+	struct ath_softc *sc = ic->ic_dev->priv;
+	struct ath_hal *ah = sc->sc_ah;
+	u32 cc, busy, rx, tx;
+	s16 noise;
+
+	if (l)
+		goto out;
+
+	OS_REG_WRITE(ah, AR5K_MIBC, AR5K_MIBC_FREEZE);
+	cc = READ_CLR(ah, AR5K_CYCLES);
+	busy = READ_CLR(ah, AR5K_RXCLEAR);
+	rx = READ_CLR(ah, AR5K_RXFC);
+	tx = READ_CLR(ah, AR5K_TXFC);
+	OS_REG_WRITE(ah, AR5K_MIBC, 0);
+	noise = ath_hal_get_channel_noise(sc->sc_ah, &(sc->sc_curchan));
+	ic->ic_channoise = noise;
+
+	WPROBE_FILL_BEGIN(val, ath_wprobe_globals);
+	if (cc & 0xf0000000) {
+		/* scale down if the counters are near max */
+		cc >>= 8;
+		busy >>= 8;
+		rx >>= 8;
+		tx >>= 8;
+	}
+	if (ah->ah_macType < 5212)
+		goto phy_skip;
+	if (!cc)
+		goto phy_skip;
+	if (busy > cc)
+		goto phy_skip;
+	if (rx > cc)
+		goto phy_skip;
+	if (tx > cc)
+		goto phy_skip;
+	busy = (busy * 100) / cc;
+	rx = (rx * 100) / cc;
+	tx = (tx * 100) / cc;
+	WPROBE_SET(WP_GLOBAL_PHY_BUSY, U8, busy);
+	WPROBE_SET(WP_GLOBAL_PHY_RX, U8, rx);
+	WPROBE_SET(WP_GLOBAL_PHY_TX, U8, tx);
+	WPROBE_SET(WP_GLOBAL_FRAMES, U32, avp->av_rxframes);
+	WPROBE_SET(WP_GLOBAL_PROBEREQ, U32, avp->av_rxprobereq);
+
+phy_skip:
+	WPROBE_SET(WP_GLOBAL_NOISE, S16, noise);
+	WPROBE_FILL_END();
+
+out:
+	return 0;
+}
+
+#undef AR5K_TXFC
+#undef AR5K_RXFC
+#undef AR5K_RXCLEAR
+#undef AR5K_CYCLES
+#undef AR5K_MIBC
+#undef AR5K_MIBC_FREEZE
+#undef READ_CLR
+
+static const struct wprobe_iface ath_wprobe_dev = {
+	.link_items = ath_wprobe_link,
+	.n_link_items = ARRAY_SIZE(ath_wprobe_link),
+	.global_items = ath_wprobe_globals,
+	.n_global_items = ARRAY_SIZE(ath_wprobe_globals),
+	.sync_data = ath_wprobe_sync,
+};
+
+static int
+ath_lookup_rateval(struct ieee80211_node *ni, int rate)
+{
+	struct ieee80211vap *vap = ni->ni_vap;
+	struct ieee80211com *ic = vap->iv_ic;
+	struct ath_softc *sc = ic->ic_dev->priv;
+	const HAL_RATE_TABLE *rt = sc->sc_currates;
+
+	if ((!rt) || (rate < 0) || (rate >= ARRAY_SIZE(sc->sc_hwmap)))
+		return -1;
+
+	rate = sc->sc_hwmap[rate].ieeerate;
+	rate = sc->sc_rixmap[rate & IEEE80211_RATE_VAL];
+	if ((rate < 0) || (rate >= rt->rateCount))
+		return -1;
+
+	return rt->info[rate].rateKbps;
+}
+
+static void
+ath_wprobe_report_rx(struct ieee80211vap *vap, struct ath_rx_status *rs, struct sk_buff *skb)
+{
+	const struct ieee80211_frame *wh = (struct ieee80211_frame *)skb->data;
+	struct wprobe_wlan_hdr hdr;
+	struct ath_vap *avp;
+	int hdrsize;
+
+	if (wprobe_disabled())
+		return;
+
+	avp = ATH_VAP(vap);
+	avp->av_rxframes++;
+	if (wh->i_fc[0] == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
+		avp->av_rxprobereq++;
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.len = skb->len;
+	hdr.snr = rs->rs_rssi;
+	hdr.type = WPROBE_PKT_RX;
+	if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
+		hdrsize = sizeof(struct ieee80211_ctlframe_addr2);
+	else
+		hdrsize = ieee80211_hdrsize(skb->data);
+	wprobe_add_frame(&avp->av_wpif, &hdr, skb->data, hdrsize + 0x42);
+}
+
+
+static void
+ath_node_sample_rx(struct ieee80211_node *ni, struct ath_rx_status *rs)
+{
+	struct ath_node *an = ATH_NODE(ni);
+	struct ieee80211vap *vap = ni->ni_vap;
+	struct ieee80211com *ic = vap->iv_ic;
+	struct wprobe_link *l = &an->an_wplink;
+	struct wprobe_value *v = l->val;
+	unsigned long flags;
+	int rate;
+
+	if (wprobe_disabled() || !an->an_wplink_active || !l->val)
+		return;
+
+	rate = ath_lookup_rateval(ni, rs->rs_rate);
+
+	spin_lock_irqsave(&l->iface->lock, flags);
+	WPROBE_FILL_BEGIN(v, ath_wprobe_link);
+	WPROBE_SET(WP_NODE_RSSI, U8, rs->rs_rssi);
+	WPROBE_SET(WP_NODE_SIGNAL, S16, ic->ic_channoise + rs->rs_rssi);
+	if ((rate > 0) && (rate <= 600000))
+		WPROBE_SET(WP_NODE_RX_RATE, U16, rate);
+	WPROBE_FILL_END();
+	wprobe_update_stats(l->iface, l);
+	spin_unlock_irqrestore(&l->iface->lock, flags);
+}
+
+static void
+ath_wprobe_report_tx(struct ieee80211vap *vap, struct ath_tx_status *ts, struct sk_buff *skb)
+{
+	const struct ieee80211_frame *wh = (struct ieee80211_frame *)skb->data;
+	struct wprobe_wlan_hdr hdr;
+	struct ath_vap *avp;
+	int hdrsize;
+
+	if (wprobe_disabled())
+		return;
+
+	avp = ATH_VAP(vap);
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.len = skb->len;
+	hdr.snr = ts->ts_rssi;
+	hdr.type = WPROBE_PKT_TX;
+	if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
+		hdrsize = sizeof(struct ieee80211_ctlframe_addr2);
+	else
+		hdrsize = ieee80211_hdrsize(skb->data);
+	wprobe_add_frame(&avp->av_wpif, &hdr, skb->data, hdrsize + 0x42);
+}
+
+
+
+static void
+ath_node_sample_tx(struct ieee80211_node *ni, struct ath_tx_status *ts, struct sk_buff *skb)
+{
+	struct ath_node *an = ATH_NODE(ni);
+	struct ieee80211vap *vap = ni->ni_vap;
+	struct ieee80211com *ic = vap->iv_ic;
+	struct wprobe_link *l = &an->an_wplink;
+	struct wprobe_value *v = l->val;
+	unsigned long flags;
+	int rate, rexmit_counter;
+	int len = skb->len;
+
+	if (wprobe_disabled() || !an->an_wplink_active || !l->val)
+		return;
+
+	ath_wprobe_report_tx(vap, ts, skb);
+	rate = ath_lookup_rateval(ni, ts->ts_rate);
+
+	spin_lock_irqsave(&l->iface->lock, flags);
+	WPROBE_FILL_BEGIN(v, ath_wprobe_link);
+	WPROBE_SET(WP_NODE_RSSI, U8, ts->ts_rssi);
+	WPROBE_SET(WP_NODE_SIGNAL, S16, ic->ic_channoise + ts->ts_rssi);
+
+	if (len <= 200)
+		rexmit_counter = WP_NODE_RETRANSMIT_200;
+	else if (len <= 400)
+		rexmit_counter = WP_NODE_RETRANSMIT_400;
+	else if (len <= 800)
+		rexmit_counter = WP_NODE_RETRANSMIT_800;
+	else
+		rexmit_counter = WP_NODE_RETRANSMIT_1600;
+	WPROBE_SET(rexmit_counter, U8, ts->ts_longretry);
+
+	if ((rate > 0) && (rate <= 600000))
+		WPROBE_SET(WP_NODE_TX_RATE, U16, rate);
+	WPROBE_FILL_END();
+	wprobe_update_stats(l->iface, l);
+	spin_unlock_irqrestore(&l->iface->lock, flags);
+}
+
+static void
+ath_wprobe_node_join(struct ieee80211vap *vap, struct ieee80211_node *ni)
+{
+	struct wprobe_iface *dev;
+	struct wprobe_link *l;
+	struct ath_vap *avp;
+	struct ath_node *an = ATH_NODE(ni);
+
+	if (wprobe_disabled() || an->an_wplink_active)
+		return;
+
+	avp = ATH_VAP(vap);
+	dev = &avp->av_wpif;
+	l = &an->an_wplink;
+
+	ieee80211_ref_node(ni);
+	wprobe_add_link(dev, l, ni->ni_macaddr);
+	an->an_wplink_active = 1;
+}
+
+static void
+ath_wprobe_do_node_leave(struct work_struct *work)
+{
+	struct ath_node *an = container_of(work, struct ath_node, an_destroy);
+	struct ieee80211_node *ni = &an->an_node;
+	struct ieee80211vap *vap = ni->ni_vap;
+	struct wprobe_iface *dev;
+	struct wprobe_link *l;
+	struct ath_vap *avp;
+
+	avp = ATH_VAP(vap);
+	dev = &avp->av_wpif;
+	l = &an->an_wplink;
+
+	wprobe_remove_link(dev, l);
+	ieee80211_unref_node(&ni);
+	atomic_dec(&cleanup_tasks);
+}
+
+static void
+ath_wprobe_node_leave(struct ieee80211vap *vap, struct ieee80211_node *ni)
+{
+	struct ath_node *an = ATH_NODE(ni);
+
+	if (wprobe_disabled() || !an->an_wplink_active)
+		return;
+
+	atomic_inc(&cleanup_tasks);
+	an->an_wplink_active = 0;
+	IEEE80211_INIT_WORK(&an->an_destroy, ath_wprobe_do_node_leave);
+	schedule_work(&an->an_destroy);
+}
+
+static void
+ath_init_wprobe_dev(struct ath_vap *avp)
+{
+	struct ieee80211vap *vap = &avp->av_vap;
+	struct wprobe_iface *dev = &avp->av_wpif;
+
+	if (wprobe_disabled() || (vap->iv_opmode == IEEE80211_M_WDS))
+		return;
+
+	memcpy(dev, &ath_wprobe_dev, sizeof(struct wprobe_iface));
+	dev->addr = vap->iv_myaddr;
+	dev->name = vap->iv_dev->name;
+	wprobe_add_iface(dev);
+}
+
+static void
+ath_remove_wprobe_dev(struct ath_vap *avp)
+{
+	struct ieee80211vap *vap = &avp->av_vap;
+	struct ieee80211com *ic = vap->iv_ic;
+	struct ieee80211_node *ni;
+	struct wprobe_iface *dev = &avp->av_wpif;
+	struct wprobe_link *l;
+	struct ath_node *an;
+	unsigned long flags;
+
+	if (wprobe_disabled() || (vap->iv_opmode == IEEE80211_M_WDS))
+		return;
+
+restart:
+	rcu_read_lock();
+	list_for_each_entry_rcu(l, &dev->links, list) {
+		an = container_of(l, struct ath_node, an_wplink);
+
+		if (!an->an_wplink_active)
+			continue;
+
+		ni = &an->an_node;
+		ath_wprobe_node_leave(vap, ni);
+		rcu_read_unlock();
+		goto restart;
+	}
+	rcu_read_unlock();
+
+	/* wait for the cleanup tasks to finish */
+	while (atomic_read(&cleanup_tasks) != 0) {
+		schedule();
+	}
+
+	wprobe_remove_iface(dev);
+}
--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -400,6 +400,7 @@ static int countrycode = -1;
 static int maxvaps = -1;
 static int outdoor = -1;
 static int xchanmode = -1;
+#include "ath_wprobe.c"
 static int beacon_cal = 1;
 
 static const struct ath_hw_detect generic_hw_info = {
@@ -1525,6 +1526,7 @@ ath_vap_create(struct ieee80211com *ic,
 		ath_hal_intrset(ah, sc->sc_imask);
 	}
 
+	ath_init_wprobe_dev(avp);
 	return vap;
 }
 
@@ -1606,6 +1608,7 @@ ath_vap_delete(struct ieee80211vap *vap)
 		decrease = 0;
 
 	ieee80211_vap_detach(vap);
+	ath_remove_wprobe_dev(ATH_VAP(vap));
 	/* NB: memory is reclaimed through dev->destructor callback */
 	if (decrease)
 		sc->sc_nvaps--;
@@ -5940,6 +5943,7 @@ ath_node_cleanup(struct ieee80211_node *
 	/* Clean up node-specific rate things - this currently appears to 
 	 * always be a no-op */
 	sc->sc_rc->ops->node_cleanup(sc, ATH_NODE(ni));
+	ath_wprobe_node_leave(ni->ni_vap, ni);
 
 	ATH_NODE_UAPSD_LOCK_IRQ(an);
 #ifdef IEEE80211_DEBUG_REFCNT
@@ -7010,6 +7014,8 @@ drop_micfail:
 				goto lookup_slowpath;
 			}
 			ATH_RSSI_LPF(ATH_NODE(ni)->an_avgrssi, rs->rs_rssi);
+			ath_node_sample_rx(ni, rs);
+			ath_wprobe_report_rx(ni->ni_vap, rs, skb);
 			type = ieee80211_input(ni->ni_vap, ni, skb, rs->rs_rssi, bf->bf_tsf);
 			ieee80211_unref_node(&ni);
 		} else {
@@ -7024,15 +7030,21 @@ lookup_slowpath:
 			else
 				vap = ieee80211_find_rxvap(ic, wh->i_addr1);
 
-			if (vap)
+			if (vap) {
+				ath_wprobe_report_rx(vap, rs, skb);
 				ni = ieee80211_find_rxnode(ic, vap, wh);
-			else
+			} else {
+				TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
+					ath_wprobe_report_rx(vap, rs, skb);
+				}
 				ni = NULL;
+			}
 
 			if (ni != NULL) {
 				ieee80211_keyix_t keyix;
 
 				ATH_RSSI_LPF(ATH_NODE(ni)->an_avgrssi, rs->rs_rssi);
+				ath_node_sample_rx(ni, rs);
 				type = ieee80211_input(vap, ni, skb, rs->rs_rssi, bf->bf_tsf);
 				/*
 				 * If the station has a key cache slot assigned
@@ -8612,6 +8624,7 @@ ath_tx_processq(struct ath_softc *sc, st
 				sc->sc_stats.ast_tx_rssi = ts->ts_rssi;
 				ATH_RSSI_LPF(an->an_halstats.ns_avgtxrssi,
 					ts->ts_rssi);
+					ath_node_sample_tx(&an->an_node, ts, bf->bf_skb);
 				if (bf->bf_skb->priority == WME_AC_VO ||
 				    bf->bf_skb->priority == WME_AC_VI)
 					ni->ni_ic->ic_wme.wme_hipri_traffic++;
@@ -10111,6 +10124,7 @@ ath_newassoc(struct ieee80211_node *ni,
 	struct ath_softc *sc = ic->ic_dev->priv;
 
 	sc->sc_rc->ops->newassoc(sc, ATH_NODE(ni), isnew);
+	ath_wprobe_node_join(ni->ni_vap, ni);
 
 	/* are we supporting compression? */
 	if (!(vap->iv_ath_cap & ni->ni_ath_flags & IEEE80211_NODE_COMP))
--- a/ath/if_athvar.h
+++ b/ath/if_athvar.h
@@ -46,6 +46,7 @@
 #include "ah_desc.h"
 #include "ah_os.h"
 #include "if_athioctl.h"
+#include <linux/wprobe.h>
 #include "net80211/ieee80211.h"		/* XXX for WME_NUM_AC */
 #include <asm/io.h>
 #include <linux/list.h>
@@ -352,6 +353,9 @@ typedef STAILQ_HEAD(, ath_buf) ath_bufhe
 /* driver-specific node state */
 struct ath_node {
 	struct ieee80211_node an_node;		/* base class */
+	struct wprobe_link an_wplink;
+	uint8_t an_wplink_active;
+	struct work_struct an_destroy;
 	u_int16_t an_decomp_index; 		/* decompression mask index */
 	u_int32_t an_avgrssi;			/* average rssi over all rx frames */
 	u_int8_t  an_prevdatarix;		/* rate ix of last data frame */
@@ -521,6 +525,9 @@ struct ath_vap {
 #else
 	unsigned int av_beacon_alloc;
 #endif
+	struct wprobe_iface av_wpif;
+	u32 av_rxframes;
+	u32 av_rxprobereq;
 };
 #define	ATH_VAP(_v)	((struct ath_vap *)(_v))