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ath9k: backport dynack improvements
Close cooperation with Lorenzo Bianconi resulted in these patches which fix all remaining seen issues when using dynack. Fix link losses when: - Late Ack's are not seen or not present - switching from too low static coverage class to dynack on a live link These are fixed by setting the Ack Timeout/Slottime to the max possible value for the currently used channel width when a new station has been discovered. When traffic flows, dynack is able to adjust to optimal values within a few packets received (typically < 1 second) These changes have been thoroughly tested on ~60 offshore devices all interconnected using mesh over IBSS and dynack enabled on all. Distances between devices varied from <100m up to ~35km [move patches to correct folder + renumber] Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> (cherry picked from commit f6e8ba0238fe349b7529357793e2fb18635819ed)
This commit is contained in:
Koen Vandeputte
parent
73bba470a4
commit
4b5c77ca2f
@ -0,0 +1,94 @@
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From 4420866ef1b602682b009e0186fbb8aefd2125be Mon Sep 17 00:00:00 2001
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Tue, 20 Aug 2019 18:20:19 +0200
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Subject: [PATCH 1/4] ath9k: dynack: introduce ath_dynack_set_timeout routine
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Introduce ath_dynack_set_timeout routine to configure slottime/ack/cts
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timeouts and remove duplicated code
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Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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---
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drivers/net/wireless/ath/ath9k/dynack.c | 37 ++++++++++++++-----------
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1 file changed, 21 insertions(+), 16 deletions(-)
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diff --git a/drivers/net/wireless/ath/ath9k/dynack.c b/drivers/net/wireless/ath/ath9k/dynack.c
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index f112fa5b2eac..38dbe25919f7 100644
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--- a/drivers/net/wireless/ath/ath9k/dynack.c
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+++ b/drivers/net/wireless/ath/ath9k/dynack.c
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@@ -78,6 +78,24 @@ static inline bool ath_dynack_bssidmask(struct ath_hw *ah, const u8 *mac)
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return true;
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}
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+/**
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+ * ath_dynack_set_timeout - configure timeouts/slottime registers
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+ * @ah: ath hw
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+ * @to: timeout value
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+ *
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+ */
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+static void ath_dynack_set_timeout(struct ath_hw *ah, int to)
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+{
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+ struct ath_common *common = ath9k_hw_common(ah);
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+ int slottime = (to - 3) / 2;
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+
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+ ath_dbg(common, DYNACK, "ACK timeout %u slottime %u\n",
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+ to, slottime);
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+ ath9k_hw_setslottime(ah, slottime);
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+ ath9k_hw_set_ack_timeout(ah, to);
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+ ath9k_hw_set_cts_timeout(ah, to);
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+}
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+
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/**
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* ath_dynack_compute_ackto - compute ACK timeout as the maximum STA timeout
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* @ah: ath hw
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@@ -86,7 +104,6 @@ static inline bool ath_dynack_bssidmask(struct ath_hw *ah, const u8 *mac)
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*/
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static void ath_dynack_compute_ackto(struct ath_hw *ah)
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{
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- struct ath_common *common = ath9k_hw_common(ah);
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struct ath_dynack *da = &ah->dynack;
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struct ath_node *an;
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int to = 0;
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@@ -96,15 +113,8 @@ static void ath_dynack_compute_ackto(struct ath_hw *ah)
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to = an->ackto;
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if (to && da->ackto != to) {
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- u32 slottime;
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-
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- slottime = (to - 3) / 2;
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+ ath_dynack_set_timeout(ah, to);
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da->ackto = to;
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- ath_dbg(common, DYNACK, "ACK timeout %u slottime %u\n",
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- da->ackto, slottime);
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- ath9k_hw_setslottime(ah, slottime);
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- ath9k_hw_set_ack_timeout(ah, da->ackto);
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- ath9k_hw_set_cts_timeout(ah, da->ackto);
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}
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}
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@@ -198,10 +208,7 @@ void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
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ieee80211_is_assoc_resp(hdr->frame_control) ||
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ieee80211_is_auth(hdr->frame_control)) {
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ath_dbg(common, DYNACK, "late ack\n");
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-
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- ath9k_hw_setslottime(ah, (LATEACK_TO - 3) / 2);
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- ath9k_hw_set_ack_timeout(ah, LATEACK_TO);
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- ath9k_hw_set_cts_timeout(ah, LATEACK_TO);
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+ ath_dynack_set_timeout(ah, LATEACK_TO);
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if (sta) {
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struct ath_node *an;
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@@ -340,9 +347,7 @@ void ath_dynack_reset(struct ath_hw *ah)
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da->ack_rbf.h_rb = 0;
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/* init acktimeout */
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- ath9k_hw_setslottime(ah, (ackto - 3) / 2);
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- ath9k_hw_set_ack_timeout(ah, ackto);
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- ath9k_hw_set_cts_timeout(ah, ackto);
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+ ath_dynack_set_timeout(ah, ackto);
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}
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EXPORT_SYMBOL(ath_dynack_reset);
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--
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2.17.1
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@ -0,0 +1,32 @@
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From e5b56ce50eab31d24df6a70cf025db3acc4aa3ac Mon Sep 17 00:00:00 2001
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Tue, 20 Aug 2019 18:20:20 +0200
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Subject: [PATCH 2/4] ath9k: dynack: properly set last timeout timestamp in
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ath_dynack_reset
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Add compute timeout to last computation timestamp in
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ath_dynack_reset in order to not run ath_dynack_compute_ackto
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immediately
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Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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---
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drivers/net/wireless/ath/ath9k/dynack.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/net/wireless/ath/ath9k/dynack.c b/drivers/net/wireless/ath/ath9k/dynack.c
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index 38dbe25919f7..398ea872751f 100644
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--- a/drivers/net/wireless/ath/ath9k/dynack.c
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+++ b/drivers/net/wireless/ath/ath9k/dynack.c
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@@ -338,7 +338,7 @@ void ath_dynack_reset(struct ath_hw *ah)
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u32 ackto = 9 + 16 + 64;
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struct ath_dynack *da = &ah->dynack;
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- da->lto = jiffies;
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+ da->lto = jiffies + COMPUTE_TO;
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da->ackto = ackto;
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da->st_rbf.t_rb = 0;
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--
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2.17.1
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@ -0,0 +1,96 @@
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From 3f737abb7d53cc80d619a3b4a30b6fa63cdc8df7 Mon Sep 17 00:00:00 2001
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Tue, 20 Aug 2019 18:20:21 +0200
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Subject: [PATCH 3/4] ath9k: dynack: set max timeout according to channel width
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Compute maximum configurable ackimeout/ctstimeout according to channel
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width (clockrate)
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Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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---
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drivers/net/wireless/ath/ath9k/dynack.c | 38 +++++++++++++++++++------
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1 file changed, 30 insertions(+), 8 deletions(-)
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diff --git a/drivers/net/wireless/ath/ath9k/dynack.c b/drivers/net/wireless/ath/ath9k/dynack.c
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index 398ea872751f..fe9181533de3 100644
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--- a/drivers/net/wireless/ath/ath9k/dynack.c
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+++ b/drivers/net/wireless/ath/ath9k/dynack.c
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@@ -20,11 +20,30 @@
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#define COMPUTE_TO (5 * HZ)
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#define LATEACK_DELAY (10 * HZ)
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-#define LATEACK_TO 256
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-#define MAX_DELAY 300
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#define EWMA_LEVEL 96
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#define EWMA_DIV 128
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+/**
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+ * ath_dynack_get_max_to - set max timeout according to channel width
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+ * @ah: ath hw
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+ *
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+ */
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+static u32 ath_dynack_get_max_to(struct ath_hw *ah)
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+{
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+ const struct ath9k_channel *chan = ah->curchan;
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+
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+ if (!chan)
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+ return 300;
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+
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+ if (IS_CHAN_HT40(chan))
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+ return 300;
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+ if (IS_CHAN_HALF_RATE(chan))
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+ return 750;
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+ if (IS_CHAN_QUARTER_RATE(chan))
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+ return 1500;
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+ return 600;
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+}
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+
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/**
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* ath_dynack_ewma - EWMA (Exponentially Weighted Moving Average) calculation
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*
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@@ -126,15 +145,16 @@ static void ath_dynack_compute_ackto(struct ath_hw *ah)
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*/
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static void ath_dynack_compute_to(struct ath_hw *ah)
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{
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- u32 ackto, ack_ts;
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- u8 *dst, *src;
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+ struct ath_dynack *da = &ah->dynack;
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+ u32 ackto, ack_ts, max_to;
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struct ieee80211_sta *sta;
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- struct ath_node *an;
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struct ts_info *st_ts;
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- struct ath_dynack *da = &ah->dynack;
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+ struct ath_node *an;
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+ u8 *dst, *src;
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rcu_read_lock();
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+ max_to = ath_dynack_get_max_to(ah);
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while (da->st_rbf.h_rb != da->st_rbf.t_rb &&
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da->ack_rbf.h_rb != da->ack_rbf.t_rb) {
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ack_ts = da->ack_rbf.tstamp[da->ack_rbf.h_rb];
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@@ -150,7 +170,7 @@ static void ath_dynack_compute_to(struct ath_hw *ah)
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if (ack_ts > st_ts->tstamp + st_ts->dur) {
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ackto = ack_ts - st_ts->tstamp - st_ts->dur;
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- if (ackto < MAX_DELAY) {
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+ if (ackto < max_to) {
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sta = ieee80211_find_sta_by_ifaddr(ah->hw, dst,
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src);
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if (sta) {
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@@ -207,8 +227,10 @@ void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
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if (ieee80211_is_assoc_req(hdr->frame_control) ||
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ieee80211_is_assoc_resp(hdr->frame_control) ||
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ieee80211_is_auth(hdr->frame_control)) {
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+ u32 max_to = ath_dynack_get_max_to(ah);
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+
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ath_dbg(common, DYNACK, "late ack\n");
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- ath_dynack_set_timeout(ah, LATEACK_TO);
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+ ath_dynack_set_timeout(ah, max_to);
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if (sta) {
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struct ath_node *an;
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--
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2.17.1
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@ -0,0 +1,78 @@
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From cc783bfa67e87d2e6206f7626b7bbb74d5c5f269 Mon Sep 17 00:00:00 2001
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Tue, 20 Aug 2019 18:20:22 +0200
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Subject: [PATCH 4/4] ath9k: dynack: set ackto to max timeout in
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ath_dynack_reset
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Initialize acktimeout to the maximum configurable value in
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ath_dynack_reset in order to not disconnect long distance static links
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enabling dynack and even to take care of possible errors configuring
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a static timeout. Moreover initialize station timeout value to the current
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acktimeout value
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Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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---
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drivers/net/wireless/ath/ath9k/dynack.c | 20 +++++++++++++-------
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1 file changed, 13 insertions(+), 7 deletions(-)
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diff --git a/drivers/net/wireless/ath/ath9k/dynack.c b/drivers/net/wireless/ath/ath9k/dynack.c
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index fe9181533de3..f786be04d0ac 100644
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--- a/drivers/net/wireless/ath/ath9k/dynack.c
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+++ b/drivers/net/wireless/ath/ath9k/dynack.c
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@@ -321,11 +321,9 @@ EXPORT_SYMBOL(ath_dynack_sample_ack_ts);
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*/
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void ath_dynack_node_init(struct ath_hw *ah, struct ath_node *an)
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{
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- /* ackto = slottime + sifs + air delay */
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- u32 ackto = 9 + 16 + 64;
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struct ath_dynack *da = &ah->dynack;
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- an->ackto = ackto;
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+ an->ackto = da->ackto;
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spin_lock(&da->qlock);
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list_add_tail(&an->list, &da->nodes);
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@@ -356,20 +354,26 @@ EXPORT_SYMBOL(ath_dynack_node_deinit);
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*/
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void ath_dynack_reset(struct ath_hw *ah)
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{
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- /* ackto = slottime + sifs + air delay */
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- u32 ackto = 9 + 16 + 64;
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struct ath_dynack *da = &ah->dynack;
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+ struct ath_node *an;
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+
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+ spin_lock_bh(&da->qlock);
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da->lto = jiffies + COMPUTE_TO;
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- da->ackto = ackto;
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da->st_rbf.t_rb = 0;
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da->st_rbf.h_rb = 0;
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da->ack_rbf.t_rb = 0;
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da->ack_rbf.h_rb = 0;
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+ da->ackto = ath_dynack_get_max_to(ah);
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+ list_for_each_entry(an, &da->nodes, list)
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+ an->ackto = da->ackto;
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+
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/* init acktimeout */
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- ath_dynack_set_timeout(ah, ackto);
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+ ath_dynack_set_timeout(ah, da->ackto);
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+
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+ spin_unlock_bh(&da->qlock);
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}
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EXPORT_SYMBOL(ath_dynack_reset);
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@@ -386,6 +390,8 @@ void ath_dynack_init(struct ath_hw *ah)
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spin_lock_init(&da->qlock);
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INIT_LIST_HEAD(&da->nodes);
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+ /* ackto = slottime + sifs + air delay */
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+ da->ackto = 9 + 16 + 64;
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ah->hw->wiphy->features |= NL80211_FEATURE_ACKTO_ESTIMATION;
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}
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--
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2.17.1
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