ath9k: fix dynack in IBSS mode
Currently, dynack was only tested upstream using AP/STA mode. Testing it on IBSS, showed that late-ack detection was broken. This is caused due to dynack using Association Request/Response frames for late-ack detection, which IBSS does not use. Also allowing Authentication frames here solves this. A second issue also got fixed, which was also seen AP/STA mode: When a station was added, the estimated value would be exponentially averaged using 0 as a starting point. This means that on larger distances, the ack timeout was still not high enough before synchronizing would run out of late-ack's for estimation. Fix this by using the initial estimated value as a baseline and only start averaging in the following estimation rounds. Test setup: - 2x identical devices: RB912UAG-5HPnD + 19dB sector - IBSS - 2x2 802.11an (ar9340), HT20, long GI - RSSI's -70 / -71 - Real distance: 23910 meter Results (60s iperf runs): Fixed coverage class 54 (up to 24300m): * 21.5 Mbits/sec Dynack: * 28.9 Mbits/sec Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
This commit is contained in:
Koen Vandeputte
parent
860de2e1aa
commit
5ac34818f9
5 changed files with 309 additions and 0 deletions
|
|
@ -0,0 +1,27 @@
|
|||
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
Date: Fri, 2 Nov 2018 21:49:55 +0100
|
||||
Subject: [PATCH] ath9k: dynack: use authentication messages for 'late' ack
|
||||
|
||||
In order to properly support dynack in ad-hoc mode running
|
||||
wpa_supplicant, take into account authentication frames for
|
||||
'late ack' detection. This patch has been tested on devices
|
||||
mounted on offshore high-voltage stations connected through
|
||||
~24Km link
|
||||
|
||||
Reported-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
---
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
+++ b/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
@@ -187,7 +187,8 @@ void ath_dynack_sample_tx_ts(struct ath_
|
||||
/* late ACK */
|
||||
if (ts->ts_status & ATH9K_TXERR_XRETRY) {
|
||||
if (ieee80211_is_assoc_req(hdr->frame_control) ||
|
||||
- ieee80211_is_assoc_resp(hdr->frame_control)) {
|
||||
+ ieee80211_is_assoc_resp(hdr->frame_control) ||
|
||||
+ ieee80211_is_auth(hdr->frame_control)) {
|
||||
ath_dbg(common, DYNACK, "late ack\n");
|
||||
ath9k_hw_setslottime(ah, (LATEACK_TO - 3) / 2);
|
||||
ath9k_hw_set_ack_timeout(ah, LATEACK_TO);
|
||||
|
|
@ -0,0 +1,88 @@
|
|||
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
Date: Fri, 2 Nov 2018 21:49:56 +0100
|
||||
Subject: [PATCH] ath9k: dynack: move debug log after buffer increments
|
||||
|
||||
Move debug log in ath_dynack_sample_tx_ts and ath_dynack_sample_ack_ts
|
||||
after timestamp buffer head/tail increments in order to make debugging
|
||||
more user friendly
|
||||
|
||||
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
---
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
+++ b/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
@@ -171,11 +171,12 @@ static void ath_dynack_compute_to(struct
|
||||
void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
|
||||
struct ath_tx_status *ts)
|
||||
{
|
||||
- u8 ridx;
|
||||
struct ieee80211_hdr *hdr;
|
||||
struct ath_dynack *da = &ah->dynack;
|
||||
struct ath_common *common = ath9k_hw_common(ah);
|
||||
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
||||
+ u32 dur = ts->duration;
|
||||
+ u8 ridx;
|
||||
|
||||
if ((info->flags & IEEE80211_TX_CTL_NO_ACK) || !da->enabled)
|
||||
return;
|
||||
@@ -203,14 +204,13 @@ void ath_dynack_sample_tx_ts(struct ath_
|
||||
ridx = ts->ts_rateindex;
|
||||
|
||||
da->st_rbf.ts[da->st_rbf.t_rb].tstamp = ts->ts_tstamp;
|
||||
- da->st_rbf.ts[da->st_rbf.t_rb].dur = ts->duration;
|
||||
ether_addr_copy(da->st_rbf.addr[da->st_rbf.t_rb].h_dest, hdr->addr1);
|
||||
ether_addr_copy(da->st_rbf.addr[da->st_rbf.t_rb].h_src, hdr->addr2);
|
||||
|
||||
if (!(info->status.rates[ridx].flags & IEEE80211_TX_RC_MCS)) {
|
||||
- u32 phy, sifs;
|
||||
const struct ieee80211_rate *rate;
|
||||
struct ieee80211_tx_rate *rates = info->status.rates;
|
||||
+ u32 phy;
|
||||
|
||||
rate = &common->sbands[info->band].bitrates[rates[ridx].idx];
|
||||
if (info->band == NL80211_BAND_2GHZ &&
|
||||
@@ -219,19 +219,18 @@ void ath_dynack_sample_tx_ts(struct ath_
|
||||
else
|
||||
phy = WLAN_RC_PHY_OFDM;
|
||||
|
||||
- sifs = ath_dynack_get_sifs(ah, phy);
|
||||
- da->st_rbf.ts[da->st_rbf.t_rb].dur -= sifs;
|
||||
+ dur -= ath_dynack_get_sifs(ah, phy);
|
||||
}
|
||||
-
|
||||
- ath_dbg(common, DYNACK, "{%pM} tx sample %u [dur %u][h %u-t %u]\n",
|
||||
- hdr->addr1, da->st_rbf.ts[da->st_rbf.t_rb].tstamp,
|
||||
- da->st_rbf.ts[da->st_rbf.t_rb].dur, da->st_rbf.h_rb,
|
||||
- (da->st_rbf.t_rb + 1) % ATH_DYN_BUF);
|
||||
+ da->st_rbf.ts[da->st_rbf.t_rb].dur = dur;
|
||||
|
||||
INCR(da->st_rbf.t_rb, ATH_DYN_BUF);
|
||||
if (da->st_rbf.t_rb == da->st_rbf.h_rb)
|
||||
INCR(da->st_rbf.h_rb, ATH_DYN_BUF);
|
||||
|
||||
+ ath_dbg(common, DYNACK, "{%pM} tx sample %u [dur %u][h %u-t %u]\n",
|
||||
+ hdr->addr1, ts->ts_tstamp, dur, da->st_rbf.h_rb,
|
||||
+ da->st_rbf.t_rb);
|
||||
+
|
||||
ath_dynack_compute_to(ah);
|
||||
|
||||
spin_unlock_bh(&da->qlock);
|
||||
@@ -258,14 +257,13 @@ void ath_dynack_sample_ack_ts(struct ath
|
||||
spin_lock_bh(&da->qlock);
|
||||
da->ack_rbf.tstamp[da->ack_rbf.t_rb] = ts;
|
||||
|
||||
- ath_dbg(common, DYNACK, "rx sample %u [h %u-t %u]\n",
|
||||
- da->ack_rbf.tstamp[da->ack_rbf.t_rb],
|
||||
- da->ack_rbf.h_rb, (da->ack_rbf.t_rb + 1) % ATH_DYN_BUF);
|
||||
-
|
||||
INCR(da->ack_rbf.t_rb, ATH_DYN_BUF);
|
||||
if (da->ack_rbf.t_rb == da->ack_rbf.h_rb)
|
||||
INCR(da->ack_rbf.h_rb, ATH_DYN_BUF);
|
||||
|
||||
+ ath_dbg(common, DYNACK, "rx sample %u [h %u-t %u]\n",
|
||||
+ ts, da->ack_rbf.h_rb, da->ack_rbf.t_rb);
|
||||
+
|
||||
ath_dynack_compute_to(ah);
|
||||
|
||||
spin_unlock_bh(&da->qlock);
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
Date: Fri, 2 Nov 2018 21:49:57 +0100
|
||||
Subject: [PATCH] ath9k: dynack: check da->enabled first in sampling
|
||||
routines
|
||||
|
||||
Check da->enabled flag first in ath_dynack_sample_tx_ts and
|
||||
ath_dynack_sample_ack_ts routines in order to avoid useless
|
||||
processing
|
||||
|
||||
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
---
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
+++ b/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
@@ -178,7 +178,7 @@ void ath_dynack_sample_tx_ts(struct ath_
|
||||
u32 dur = ts->duration;
|
||||
u8 ridx;
|
||||
|
||||
- if ((info->flags & IEEE80211_TX_CTL_NO_ACK) || !da->enabled)
|
||||
+ if (!da->enabled || (info->flags & IEEE80211_TX_CTL_NO_ACK))
|
||||
return;
|
||||
|
||||
spin_lock_bh(&da->qlock);
|
||||
@@ -251,7 +251,7 @@ void ath_dynack_sample_ack_ts(struct ath
|
||||
struct ath_common *common = ath9k_hw_common(ah);
|
||||
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
||||
|
||||
- if (!ath_dynack_bssidmask(ah, hdr->addr1) || !da->enabled)
|
||||
+ if (!da->enabled || !ath_dynack_bssidmask(ah, hdr->addr1))
|
||||
return;
|
||||
|
||||
spin_lock_bh(&da->qlock);
|
||||
|
|
@ -0,0 +1,139 @@
|
|||
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
Date: Fri, 2 Nov 2018 21:49:58 +0100
|
||||
Subject: [PATCH] ath9k: dynack: make ewma estimation faster
|
||||
|
||||
In order to make propagation time estimation faster,
|
||||
use current sample as ewma output value during 'late ack'
|
||||
tracking
|
||||
|
||||
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
---
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
|
||||
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
|
||||
@@ -274,7 +274,7 @@ struct ath_node {
|
||||
#endif
|
||||
u8 key_idx[4];
|
||||
|
||||
- u32 ackto;
|
||||
+ int ackto;
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
+++ b/drivers/net/wireless/ath/ath9k/dynack.c
|
||||
@@ -29,9 +29,13 @@
|
||||
* ath_dynack_ewma - EWMA (Exponentially Weighted Moving Average) calculation
|
||||
*
|
||||
*/
|
||||
-static inline u32 ath_dynack_ewma(u32 old, u32 new)
|
||||
+static inline int ath_dynack_ewma(int old, int new)
|
||||
{
|
||||
- return (new * (EWMA_DIV - EWMA_LEVEL) + old * EWMA_LEVEL) / EWMA_DIV;
|
||||
+ if (old > 0)
|
||||
+ return (new * (EWMA_DIV - EWMA_LEVEL) +
|
||||
+ old * EWMA_LEVEL) / EWMA_DIV;
|
||||
+ else
|
||||
+ return new;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -82,10 +86,10 @@ static inline bool ath_dynack_bssidmask(
|
||||
*/
|
||||
static void ath_dynack_compute_ackto(struct ath_hw *ah)
|
||||
{
|
||||
- struct ath_node *an;
|
||||
- u32 to = 0;
|
||||
- struct ath_dynack *da = &ah->dynack;
|
||||
struct ath_common *common = ath9k_hw_common(ah);
|
||||
+ struct ath_dynack *da = &ah->dynack;
|
||||
+ struct ath_node *an;
|
||||
+ int to = 0;
|
||||
|
||||
list_for_each_entry(an, &da->nodes, list)
|
||||
if (an->ackto > to)
|
||||
@@ -144,7 +148,8 @@ static void ath_dynack_compute_to(struct
|
||||
an->ackto = ath_dynack_ewma(an->ackto,
|
||||
ackto);
|
||||
ath_dbg(ath9k_hw_common(ah), DYNACK,
|
||||
- "%pM to %u\n", dst, an->ackto);
|
||||
+ "%pM to %d [%u]\n", dst,
|
||||
+ an->ackto, ackto);
|
||||
if (time_is_before_jiffies(da->lto)) {
|
||||
ath_dynack_compute_ackto(ah);
|
||||
da->lto = jiffies + COMPUTE_TO;
|
||||
@@ -166,10 +171,12 @@ static void ath_dynack_compute_to(struct
|
||||
* @ah: ath hw
|
||||
* @skb: socket buffer
|
||||
* @ts: tx status info
|
||||
+ * @sta: station pointer
|
||||
*
|
||||
*/
|
||||
void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
|
||||
- struct ath_tx_status *ts)
|
||||
+ struct ath_tx_status *ts,
|
||||
+ struct ieee80211_sta *sta)
|
||||
{
|
||||
struct ieee80211_hdr *hdr;
|
||||
struct ath_dynack *da = &ah->dynack;
|
||||
@@ -191,9 +198,16 @@ void ath_dynack_sample_tx_ts(struct ath_
|
||||
ieee80211_is_assoc_resp(hdr->frame_control) ||
|
||||
ieee80211_is_auth(hdr->frame_control)) {
|
||||
ath_dbg(common, DYNACK, "late ack\n");
|
||||
+
|
||||
ath9k_hw_setslottime(ah, (LATEACK_TO - 3) / 2);
|
||||
ath9k_hw_set_ack_timeout(ah, LATEACK_TO);
|
||||
ath9k_hw_set_cts_timeout(ah, LATEACK_TO);
|
||||
+ if (sta) {
|
||||
+ struct ath_node *an;
|
||||
+
|
||||
+ an = (struct ath_node *)sta->drv_priv;
|
||||
+ an->ackto = -1;
|
||||
+ }
|
||||
da->lto = jiffies + LATEACK_DELAY;
|
||||
}
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/dynack.h
|
||||
+++ b/drivers/net/wireless/ath/ath9k/dynack.h
|
||||
@@ -86,7 +86,8 @@ void ath_dynack_node_deinit(struct ath_h
|
||||
void ath_dynack_init(struct ath_hw *ah);
|
||||
void ath_dynack_sample_ack_ts(struct ath_hw *ah, struct sk_buff *skb, u32 ts);
|
||||
void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
|
||||
- struct ath_tx_status *ts);
|
||||
+ struct ath_tx_status *ts,
|
||||
+ struct ieee80211_sta *sta);
|
||||
#else
|
||||
static inline void ath_dynack_init(struct ath_hw *ah) {}
|
||||
static inline void ath_dynack_node_init(struct ath_hw *ah,
|
||||
@@ -97,7 +98,8 @@ static inline void ath_dynack_sample_ack
|
||||
struct sk_buff *skb, u32 ts) {}
|
||||
static inline void ath_dynack_sample_tx_ts(struct ath_hw *ah,
|
||||
struct sk_buff *skb,
|
||||
- struct ath_tx_status *ts) {}
|
||||
+ struct ath_tx_status *ts,
|
||||
+ struct ieee80211_sta *sta) {}
|
||||
#endif
|
||||
|
||||
#endif /* DYNACK_H */
|
||||
--- a/drivers/net/wireless/ath/ath9k/xmit.c
|
||||
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
|
||||
@@ -629,7 +629,7 @@ static void ath_tx_complete_aggr(struct
|
||||
if (bf == bf->bf_lastbf)
|
||||
ath_dynack_sample_tx_ts(sc->sc_ah,
|
||||
bf->bf_mpdu,
|
||||
- ts);
|
||||
+ ts, sta);
|
||||
}
|
||||
|
||||
ath_tx_complete_buf(sc, bf, txq, &bf_head, sta, ts,
|
||||
@@ -773,7 +773,8 @@ static void ath_tx_process_buffer(struct
|
||||
memcpy(info->control.rates, bf->rates,
|
||||
sizeof(info->control.rates));
|
||||
ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
|
||||
- ath_dynack_sample_tx_ts(sc->sc_ah, bf->bf_mpdu, ts);
|
||||
+ ath_dynack_sample_tx_ts(sc->sc_ah, bf->bf_mpdu, ts,
|
||||
+ sta);
|
||||
}
|
||||
ath_tx_complete_buf(sc, bf, txq, bf_head, sta, ts, txok);
|
||||
} else
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
Date: Fri, 2 Nov 2018 21:49:59 +0100
|
||||
Subject: [PATCH] ath9k: dynack: remove 'experimental' tag
|
||||
|
||||
Remove experimental tag from dynack Kconfig entry since it has
|
||||
been tested on outdoor 25Km links
|
||||
|
||||
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
||||
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
|
||||
---
|
||||
|
||||
--- a/drivers/net/wireless/ath/ath9k/Kconfig
|
||||
+++ b/drivers/net/wireless/ath/ath9k/Kconfig
|
||||
@@ -132,7 +132,7 @@ config ATH9K_DFS_CERTIFIED
|
||||
except increase code size.
|
||||
|
||||
config ATH9K_DYNACK
|
||||
- bool "Atheros ath9k ACK timeout estimation algorithm (EXPERIMENTAL)"
|
||||
+ bool "Atheros ath9k ACK timeout estimation algorithm"
|
||||
depends on ATH9K
|
||||
default n
|
||||
---help---
|
||||
Loading…
Reference in a new issue